JP2011149163A - Overhaul facility for steel tower support structure and method for overhauling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for overhauling a steel tower support structure, which can prevent the interference thereof with a stack shell overhauling unit during the overhauling, eliminates the need for installing a ring girder fixed to the outer periphery of the stack shell serving as a support point structural member and a guide roller for supporting the stack shell by abutting on the outer peripheral surface thereof, and eliminates the need for a high lift work. <P>SOLUTION: In this overhaul facility, the stack shell overhauling unit used for cutting and removing the stack shell includes a jack device for supporting the stack shell which is used to lift a vertically extending lift member 4, a jack frame 3a on which the jack device for supporting the stack shell is mounted and which is installed on a foundation member 23 in the stack shell 1, and a lifting member 5 for the stack shell which is connected to the bottom end of the vertically extending lift member 4 and which holds the lower side of the stack shell 1. The lifting member 5 for the stack shell includes a holding means comprising a plurality of arm parts which extend toward the peripheral surface of the stack shell 1 and the front ends of which are inserted, from the inside, into through-holes 6a formed in the stack shell 1 at a plurality of positions in the circumferential direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a dismantling facility for a tower-supported structure having a structure in which a chimney, an observation tower or the like (hereinafter referred to as a cylinder) is supported from the periphery by a steel tower, and a disassembling method thereof.

First, the structure of the steel tower support structure will be described with reference to the drawings.
As shown in FIGS. 6 (a) and 6 (b), the tower-supported structure supports the barrel 1 from the periphery with the tower 2 in order to stabilize the barrel 1 having a high height. It has a structure that The tower 2 that supports the cylindrical body 1 is composed of a plurality of main pillars 2a (3, 6 etc. in addition to four) extending upward, a horizontal member 2b that connects the main pillars 2a, and a main pillar 2a. It is composed of a passed diagonal member 2c, a support point steel frame 1a of a truss structure fixed to the main column 2a, and a cylindrical support ring 1b fixed to the support point steel frame 1a. The support point steel frame 1a of the truss structure is stretched between the main column 2a and the cylindrical support ring 1b, one end of the support point steel frame 1a is the main column 2a, and the other end is the outer periphery of the cylindrical support ring 1b It is fixed to. The truss structure support point steel frame 1a and the barrel support ring 1b are steel tower side support point constituent members, and the barrel side support point constituent member is a ring gutter 1c fixed to the outer periphery of the barrel body 1. That is, as shown in FIG. 6 (b), each support point A is disposed opposite to the ring garter 1c fixed to the outer periphery of the cylinder 1 which is a support point constituting member on the cylinder side. It is composed of a cylindrical support ring 1b on the steel tower side fixed to the support point steel frame 1a.

  And in the case of the cylindrical body 1 such as a steel chimney, the ring gutter 1c fixed to the outer periphery of the cylindrical body 1 which is a supporting point constituting member, and the tower side fixed to the supporting point steel frame 1a disposed opposite thereto An appropriate gap is provided between the tube body support ring 1b and the ring gutter 1c is arranged at an interval in the height direction of the tube body 1. In the case of a steel chimney, the ring gutter 1c, which is a support point constituent member, is fixed to the outer periphery of the cylinder 1 by welding.

Next, a conventional method for dismantling the steel tower support structure will be described in detail.
(Dismantling method A)
The dismantling method A is a method in which a huge crane is installed adjacent to a steel tower supporting structure, and then both the barrel 1 and the steel tower 2 are disassembled from the upper side using the huge crane. In this dismantling method, there were a drawback that the work at a high place was increased, a usage period of the huge crane was prolonged, and a ground reinforcement for installing the huge crane was required.
(Dismantling method B)
In dismantling method B, in order to reduce the work at height and shorten the period of use of the huge crane, a plurality of barrel support jack devices 20 are installed around the base of the barrel, as shown in FIG. In this way, the cylindrical body 1 is cut and removed from the lower side. As a result, the relatively heavy cylinder 1 is disassembled first, and then a huge crane 100 for dismantling the steel tower is installed, and the work of dismantling the steel tower 2 from the upper side is performed as shown in FIG. (See Patent Document 1).

JP 2004-316333 A

However, in the case of the conventional dismantling methods A and B, a dismantling operation in which a huge crane is installed to dismantle the tower 2 at a high place or a dismantling piece 22 of the dismantling tower 2 is lifted and suspended by using a huge crane It was necessary to repeat the work of lowering.
Further, in the conventional dismantling method B, before the steel tower 2 is dismantled, the tubular body 1 is lowered, and the tubular body 1 is repeatedly cut and removed from the lower side, so that it is fixed to the outer periphery of the tubular body 1. When the ring garter 1c is lowered relative to the tower-side cylindrical support ring 1b arranged opposite to the ring garter 1c, the steel tower-side cylindrical support ring 1b and the outer peripheral surface of the cylinder 1 are in the middle of dismantling. There is a problem that the gap between the two becomes larger than an appropriate gap, and the lateral stability of the relatively heavy cylinder 1 is deteriorated. Therefore, it is necessary to newly provide guide rollers for supporting the barrel 1 in contact with the outer peripheral surface of the barrel 1 at least at three locations in the circumferential direction of the barrel support ring 1b on the steel tower side fixed to the support point steel frame 1a. There is a work at a high place before the start of dismantling. Moreover, since the ring gutter 1c fixed to the outer periphery of the cylinder 1 and the newly provided guide roller are interfered by lowering the cylinder 1 further, it is necessary to re-install the guide roller. Work in high places occurs on the way.

  Furthermore, in the case of the conventional dismantling method B, it is necessary to install the barrel support jack device 20 along the outer periphery of the base portion of the barrel 1 and suspend the suspension ring beam from the barrel support jack device 20. is there. On the suspension ring beam, the cylinder 1 holding means is installed to insert the suspension hook into the suspension hook through-hole from the outside of the cylinder 1, and the cylinder 1 is cut and removed while holding the cylinder 1. At this time, as the barrel 1 is lowered, the barrel-side supporting point constituting member (ring gutter 1c fixed to the outer circumference of the barrel 1) and the suspension ring beam for performing the holding means installation work of the barrel 1 There arises a problem on the tubular body dismantling facility (hereinafter also referred to as a tubular body dismantling unit) in which interference occurs. In order to avoid this, it is necessary to cut off the ring gutter 1c fixed to the outer periphery of the cylinder 1 with the ring gutter disassembly scaffold above the cylinder support jack device 20.

  Here, the barrel support jack device 20 is installed along the outer periphery of the base of the barrel 1 and the main column 2a is sandwiched between the main column 2a in order to cut the lower side while supporting the main column 2a of the tower 2. When the main column supporting jack device is installed and the tower 2 is lowered together with the cylinder 1 and the cylinder 1 and the tower 2 are dismantled (referred to as the dismantling method C), the truss fixed to the main pillar 2a There is a problem that interference occurs between the structure supporting point steel frame 1a and the cylindrical body supporting ring 1b fixed to the supporting point steel frame 1a and the cylindrical body supporting jack apparatus 20 which is a cylindrical body dismantling unit. In this dismantling method C, the support point steel frame 1a of the truss structure fixed to the main column 2a and the cylindrical support ring 1b fixed to the support point steel frame 1a (hereinafter also referred to as the support point constituent members 1a and 1b on the steel tower side) Is disassembled above the main column support jack device, the lateral stability of the cylinder is impaired, so it is desired to perform the disassembly operation at a position below the main column support jack device.

  The present invention eliminates the above-mentioned problems of the prior art, and when performing the dismantling operation, the interference between the barrel-side support point constituent member or the tower-side support point constituent member and the barrel dismantling unit does not occur. A guide roller that supports the barrel in contact with the outer peripheral surface of the barrel instead of the tower-side barrel support ring, which is a support point component, in order to stabilize the relatively heavy barrel in the lateral direction. It is possible to eliminate the dismantling work of dismantling the tower at a high place, and to provide a dismantling technology for the tower-supported structure that can be dismantled more safely. .

The inventor has intensively studied the dismantling technology of the steel tower support structure, and as a result, obtained the following knowledge and made the present invention.
(A) In the case of the conventional dismantling method B, the cause of the interference between the ring gutter 1c fixed to the outer periphery of the cylinder 1 and the cylinder dismantling unit as the cylinder 1 descends is the cylinder support jack Holding the cylinder 1 by installing a plurality of devices on the outer periphery of the base of the cylinder, suspending the suspension ring beam and inserting the suspension hook from the outside of the cylinder 1 onto the suspension hook through the suspension ring beam Means installation work is to be performed. Further, even in the case of the dismantling method C in which the steel tower 2 and the steel tower 2 are lowered while the steel tower 2 is lowered, a plurality of tube-supporting jack devices are provided on the outer periphery of the base of the cylinder. Since it is installed, it causes interference between the support point constituent members 1a and 1b on the steel tower side and the barrel support jack device.

Therefore, the present inventor noticed that there is almost nothing inside the barrel 1 to be disassembled, and the inside of the barrel 1 is almost hollow. That is, in the present invention, the barrel support jack device is installed inside the barrel 1 and the barrel suspension members are inserted into through holes (corresponding to the suspension hook penetration ports) provided at a plurality of locations in the circumferential direction of the barrel. The holding means installation work can be performed from the inside of the cylinder. As a result, there is no interference between the cylindrical side support point constituent member (ring gutter 1c fixed to the outer periphery of the cylindrical body 1) or the tower side support point constituent members 1a and 1b and the cylindrical body dismantling unit. did it.
(B) In the case of the conventional dismantling method B, the ring gutter 1c fixed to the outer periphery of the barrel 1 is lowered, so that the gap between the tower-side barrel support ring 1b and the outer periphery of the barrel 1 is appropriate. It becomes larger than a large gap, and the lateral stability of a relatively heavy cylinder deteriorates. Therefore, in the method of the present invention, in order to effectively stabilize the relatively heavy cylinder in the lateral direction, the ring gutter 1c fixed to the outer periphery of the cylinder 1 and the tower side on the opposite side are arranged in the middle of dismantling. The vertical displacement between the cylindrical body support ring 1b was prevented. In other words, while maintaining the structure in which the cylinder is supported by the steel tower from the surroundings, the steel tower is lowered to the ground together with the cylinder, and the lower side of the cylinder and the lower side of the main pillar are cut and removed. When doing this, the barrel cutting position and the main pillar cutting position were set to be the same. In addition, the dismantling work of the steel tower components (horizontal member 2b fixed to main pillar 2a, diagonal member 2c, and tower-side support point components 1a and 1b) is carried out using a dismantling machine installed on the ground. It is performed below the jacking device for use, preferably at a position near the lower portion of the main column suspension member. On the other hand, it is desirable that the ring garter 1c fixed to the outer periphery of the barrel 1 is longitudinally divided together with the barrel 1 when the barrel 1 is cut and removed, and then finally cut and removed. .

That is, the present invention is as follows.
The invention according to claim 1 is a dismantling facility for dismantling a tower-supported structure having a structure in which a cylinder is supported by a supporting point steel frame fixed from the periphery to a main pillar of a tower, The barrel dismantling unit for cutting and removing includes a barrel support jack device that lifts and lowers the vertically extending suspension material, and the barrel support jack device is mounted on the inside of the barrel. And a tubular suspension member that is connected to a lower end portion of the vertically extending suspension member and that holds the lower portion of the tubular body, the tubular suspension member comprising: And having a structure that fits inside the barrel, and having a plurality of arm portions extending toward the circumferential surface of the barrel, and the suspension member for the barrel includes a tip of each arm portion of the barrel It has holding means to be inserted from the inside into through-holes provided at multiple locations in the circumferential direction. A demolition equipment tower-supported structure characterized by.

  According to the second aspect of the present invention, the tower dismantling unit for cutting and removing the main pillar of the steel tower includes two main pillar supporting jack devices for raising and lowering each vertically extending suspension material, and two main pillars The main column supporting jack device, comprising: a jack mount on which a supporting jack device is mounted; and a main column suspension member that is connected to a lower end portion of each vertically extending suspension member and holds the lower side of the main column. The jack gantry has a fixed beam for moving the cradle so that the main pillar can be moved toward the barrel side when the main pillar is stopped by holding the main pillar and no load is received from the main pillar. The dismantling equipment for a tower-supported structure according to claim 1, wherein the dismantling equipment is mounted on the tower.

According to a third aspect of the present invention, the fixed beam for moving the jack cradle is composed of two beams arranged at a predetermined interval, and the lengthwise ends thereof are the base members of the cylindrical body and the main column, respectively. The dismantling equipment for a tower-supported structure according to claim 2, wherein the dismantling equipment is fixed to the tower.
According to a fourth aspect of the present invention, the steel tower dismantling unit further adds a load from the main pillar by binding the main pillar suspension members passed from the two main pillar supporting jack devices. A beam structure is provided, and the beam structure is placed on the jack gantry moving fixed beam so that the beam structure can move toward a cylinder side when receiving no load from the main pillar. This is a dismantling facility for the steel tower support structure according to 2 or 3.

  According to a fifth aspect of the present invention, the steel tower disassembly unit is further provided with a device for preventing the main pillar suspension member from being lifted, and the lift prevention device has a length corresponding to the lifting amount of the vertically extending suspension material. A threaded rod formed from the upper end and connected to the rotating means at the lower end, through holes provided in a plurality of positions of the main column suspension member so that the threaded portion penetrates, and screwed into the threaded portion And a nut arranged with a co-rotation stop above the main pillar suspension member, a bearing that rotatably receives the lower part of the threaded rod, and a bearing retainer fixed to the lower part of the threaded rod, The threaded rod connects the left and right sides of the lower part of the jack mount on which the main column support jack device is mounted, and passes through a connecting member disposed below the jack mount, and is used by bearings and bearing holders. Movement in the vertical direction is restricted and rotatable, and the length of the threaded portion protruding above the main pillar suspension member by rotating the threaded rod as the vertically elongated suspension material is raised and lowered. And detecting the load acting on the main column support jack device, comparing the measured value of the detected load with a preset threshold value, and when the measured value of the load exceeds the threshold value, the threaded rod 5. The pulling force can be resisted through a nut screwed into the threaded portion by stopping the rotation of the shaft and the operation of the main column supporting jack device. The dismantling equipment of the steel tower support type structure described in 1.

  According to a sixth aspect of the present invention, the steel tower disassembly unit further includes a main column supporting jack device that extends between the main columns and holds the main columns, and is opposite to the main column supporting jack device. In order to prevent an excessive force from being applied to the main column, a tension member for connecting adjacent main columns is provided near the height position of the main column suspension member below the main column support jack device. The dismantling equipment for a tower-supported structure according to any one of claims 2 to 5, wherein

  The invention according to claim 7 is a dismantling method for disassembling a tower-supported structure having a structure in which a cylindrical body is supported by a supporting point steel frame fixed to the main pillar of the tower from the surroundings. The dismantling equipment for a tower-supported structure according to any one of claims 6 to 6, wherein the tower is close to the ground together with the cylinder while maintaining the structure in which the cylinder is supported by the supporting point steel frame from the surroundings. A dismantling machine installed on the ground for dismantling the steel tower component including the supporting point steel frame of the truss structure fixed to the main pillar and the cylindrical support ring fixed to the supporting point steel frame A method for dismantling a tower-supported structure characterized in that, when cutting and removing the lower side of the cylinder and the lower side of the main pillar, the cylindrical cutting position and the main pillar cutting position are set to be the same. It is.

  According to the dismantling equipment according to the present invention, the fact that the inside of the cylinder body is substantially hollow, the jack mount on which the cylinder body supporting jack device is mounted is provided inside the cylinder body on the base member of the cylinder body. And a holding means for inserting the tubular suspension member into the through holes provided at a plurality of locations in the circumferential direction of the tubular body from the inside. Therefore, it is possible to prevent interference between the supporting point constituent member on the barrel side or the supporting point constituent member on the steel tower side and the cylindrical body dismantling unit used for cutting and removing the cylindrical body. An invention method can be realized in which no vertical displacement occurs between a ring gutter fixed to the outer periphery of the body and a cylindrical support ring on the steel tower side that is arranged oppositely. As a result, since the gap between the tower support ring on the pylon side and the outer peripheral surface of the cylinder can be maintained at an appropriate gap during dismantling, the lateral direction of the relatively heavy cylinder is stabilized. Therefore, there is no need to provide a new guide roller on the pylon side to contact the outer peripheral surface of the cylinder and to support the cylinder, and the cylinder remains in a structure in which the cylinder is supported by the supporting point steel frame from the surroundings. After the steel tower is lowered to near the ground together, the cylinder and the steel tower can be dismantled. Therefore, according to the present invention, the dismantling work for dismantling the steel tower at a high place can be eliminated, and the dismantling work can be performed more safely.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the dismantling equipment of the steel tower support type structure concerning this invention, and its dismantling method, (a) is a figure which shows the state before dismantling work, (b) is the state in the middle of dismantling work FIG. (A) is a front view explaining the structure of the cylinder body disassembly unit concerning embodiment of this invention, and a cylinder body disassembly work, (b) is X1-X1 sectional drawing of (a). is there. (A) is a perspective view which shows the jack mount frame which mounts the jack apparatus for main pillar support suitable for this invention. (A) is a side view for explaining the structure of a main pillar suspension member suitable for use in the present invention and the cutting / removing operation of the main pillar of a steel tower using the structure, and (b) is a main pillar suspension member. It is X2-X2 sectional drawing of (a) which shows the provided holding means of an example. It is a longitudinal cross-sectional view which shows the principal part of the lifting prevention apparatus of the main pole suspension member suitable for this invention. (A) is a front view which shows the structure of a steel tower support type structure, (b) is X3-X3 sectional drawing of (a). It is a front view explaining the dismantling operation | work of the conventional steel tower support type structure, Comprising: (a) is a figure before dismantling work, (b) is a figure which shows the state in the middle of dismantling.

Hereinafter, a dismantling facility for a tower-supported structure and a disassembling method thereof according to the present invention will be described with reference to the drawings.
The dismantling equipment for a tower-supporting structure according to the present invention includes a cylinder dismantling unit for cutting and removing the cylinder 1 and a steel tower dismantling unit for cutting and removing the main pillar 2a of the tower 2. First, a cylinder dismantling unit for cutting and removing the cylinder 1 will be described.
(Structure of cylinder dismantling unit)
As shown in FIGS. 1 (a), 1 (b), 2 (a), and 2 (b), the barrel dismantling unit according to the embodiment of the present invention moves up and down the vertically extending suspension material 4 extending in the vertical direction. A barrel support jack device 3 to be mounted, a jack mount 3a mounted on the base member 23 inside the barrel 1 with the barrel support jack device 3 mounted thereon, and a lower end portion of the vertically extending suspension member 4 A tubular suspension member 5 which is connected and holds the lower side of the tubular body 1, and a cutting means (not shown) for cutting the tubular body 1 at a tubular cutting position below the tubular suspension member 5. . A gas cutting torch or a plasma arc cutting torch can be used as a cutting means for cutting the cylinder 1.

  In this tubular body dismantling unit, as shown in FIGS. 2 (a) and 2 (b), one tubular support jack device 3 is provided inside the tubular body 1, and a vertically extending suspension member 4 is provided at the center of the tubular body 1. The jack device was installed inside the barrel 1 with the centers of the same. In this case, a through-hole penetrating vertically is provided in the center of the tubular suspension member 5 and the lower end of the vertically extending suspension member 4 is passed through the center of the tubular suspension member 5, and then the vertically elongated suspension member 4. Are connected to the center of the tubular suspension member 5. Therefore, the length L from the center of the barrel suspension member 5 to the tip of each arm portion of the barrel suspension member 5 is the same as the length from the center of the barrel 1 to the tip of each arm portion. However, in the present invention, the number of jack devices 3 installed inside the barrel 1 may be plural.

  When a plurality of jack devices are installed inside the cylinder 1, the cylinder is so that the center of the cylinder suspension member 5 connected to the lower end of each vertically extending suspension member 4 is at the center of the cylinder 1. A plurality of jack devices are equally arranged inside the body 1. That is, a through-hole penetrating vertically is provided at a position separated from the center of the tubular suspension member 5 in the radial direction by the same distance, and the lower end portion of each vertically extending suspension member 4 of the plurality of jack devices is the above-described through-hole. The lower end portion of each vertically extending suspension member 4 and the tubular suspension member 5 are connected to each other. In addition, to arrange the jack devices evenly means that the centers of the vertically extending suspension members 4 are disposed at the same distance from the center of the tubular body 1, and are used for the tubular body from the center of the tubular suspension member 5. The length L of the suspension member 5 to the tip of each arm part is the same as the length from the center of the barrel 1 to the tip of each arm part.

In addition, as will be described later, the length L from the center of the tubular suspension member 5 to the tip of each arm portion is variable, and the tubular suspension member 5 has a structure that fits inside the tubular body 1. With this structure, the lower side of the barrel 1 can be held by the barrel suspension member 5. That is, the holding means for holding the lower side of the barrel 1 is constituted by a barrel suspension member 5 having a plurality of arm portions and through holes provided at a plurality of circumferential positions at a predetermined height position of the barrel 1. Is done.
(Structure and action of the tubular member 5)
When the jack device 3 is installed inside the barrel 1 with the barrel support jack device 3 as one unit and the center of the vertically extending suspension member 4 aligned with the center of the barrel 1, the barrel suspension member 5 is It will be described that it fits inside the cylinder 1 (see FIGS. 2A and 2B).

In this embodiment, the vertically extending suspension member 4 is a step rod, the shape of the tubular suspension member 5 is a cross shape, and the number of arm portions is four. Moreover, the cylinder suspension member 5 is connected to the lower end portion of the step rod 4 extending in the vertical direction by a nut. However, the shape of the tubular suspension member 5 is not limited to a cross shape, but can be a radial shape, and the number of arm portions is plural.
In FIG. 2B, the length L from the center of the barrel suspension member 5 (coincident with the center of the barrel 1) to the tip of each arm portion is less than 1/2 of the inner diameter of the barrel 1 The amount of change of L is variable in a range until the wall thickness dimension of the cylindrical body 1 becomes equal to or larger than the wall thickness dimension. For example, each arm portion has a structure in which the eaves member 6 is detachably attached to the hollow member. Thereby, when the eaves member 6 is put into the hollow member (closer to the center of the barrel 1), the length L from the center of the barrel suspension member 5 to the tip of each arm portion becomes shorter. Since the length L can be changed to less than ½ of the inner diameter of the barrel 1, the barrel suspension member 5 is accommodated in the barrel 1.

  Here, the tubular suspension member 5 has a plurality of arm portions extending toward the peripheral surface of the tubular body 1, and the tip of each arm portion of the tubular suspension member 5 has a predetermined height of the tubular body 1. The holding means is inserted from the inside into through holes provided at a plurality of positions in the circumferential direction. It will be described that the lower side of the barrel 1 can be held by such a barrel suspension member 5. The tubular suspension member 5 pulls the collar member 6 out of the hollow member (away from the center of the tubular body 1), and the end of each arm from the center of the tubular suspension member 5 (matches the center of the tubular body 1). The length L is increased, and the length L is variable in the range from less than 1/2 of the inner diameter of the barrel 1 to the amount of change in the length L equal to or greater than the wall thickness dimension of the barrel 1. Therefore, the pulled out collar member 6 can be inserted into the through hole 6a. Next, by lifting the vertically extending suspension member 4 slightly with the barrel support jack device 3, the lower side of the barrel 1 can be held with the suspension member 5 for the barrel. In this holding state, a state in which the barrel 1 is cut by a predetermined height at a barrel cutting position set below the barrel suspension member 5 and vertically disassembled to remove the dismantling piece 7 of the barrel 1 is shown. This is shown in FIG.

Through holes 6a are formed in advance at a plurality of positions in the circumferential direction at predetermined height positions of the barrel 1 by the number of arm portions of the barrel suspension member 5. When the number of arm portions is four and the shape of the tubular suspension member 5 is a cross shape, the through holes 6a are provided in the circumferential direction of the tubular body 1 at intervals of 90 degrees.
(Structure and operation of the barrel support jack device 3)
It is desirable to use a step rod penetrating jack device capable of moving the step rod 4 up and down step by step as the barrel supporting jack device 3. The step rod 4 extending in the vertical direction has wedge-shaped recesses formed at equal intervals in the rod length direction. In the cylindrical body disassembling unit according to this embodiment, the step rod 4 extending in the vertical direction is the vertically extending suspension member 4 that is lifted and lowered by the jack device, but the present invention is not limited to this. Instead of the step rod 4, a wire or a screw rod can be used as the vertically extending suspension material 4. The barrel support jack device 3 and the main column support jack device 8 described later are connected to the control device 18 via hydraulic units (not shown), respectively (see FIGS. 1A and 1B). ).
(The structure of the jack mount 3a equipped with the barrel support jack device 3)
A jack cradle 3a on which one barrel support jack device 3 is mounted includes an integral cross-shaped gantry beam, four gantry pillars, and four horizontal members (FIGS. 2A and 2B). )reference). The four gantry columns have upper ends fixed to the four corners of the cross-shaped gantry beam and lower ends in contact with the foundation member 23. Moreover, the horizontal member is being fixed to the upper part of the adjacent mount pillar.

The heights of the four gantry pillars are such that the vertically extending suspension member 4 is suspended below the cross-shaped gantry beam, and further, the lower side of the cylinder 1 is set to a predetermined height below the cylinder suspension member 5. The cutting position for cutting by that amount can be set. In FIG. 2A, h ₁ indicates the dismantling piece height of the barrel 1. A through hole having an inner diameter larger than the diameter of the vertically extending suspension member 4 is provided at the center of the cross-shaped frame beam. And the cylinder support jack apparatus 3 is being fixed to the center part of the cross-shaped mount beam.

Such a jack cradle 3a is provided with a single barrel support jack device 3 that can withstand the load of the barrel 1 and has a simple structure inside the barrel 1. It is preferable because it can be constructed. The barrel dismantling unit is constructed by carrying each part from the flue opening at the bottom of the barrel 1.
According to the barrel disassembly unit described above, the barrel 1 can be cut and removed by the following steps. In advance, the tubular suspension member 5 is connected to the lower end of the vertically extending suspension member 4 penetrating the tubular body supporting jack device 3, and the length from the center of the tubular suspension member 5 to the tip of each arm portion. L is shortened and stored in the cylinder 1.
(I) First, the flange member 6 of the tubular suspension member 5 connected to the lower end of the vertically extending suspension member 4 is inserted into the through-hole 6a provided in advance at a predetermined height position of the tubular body 1 from the inside of the tubular body 1. insert. Next, in the holding step, the vertically extending suspension material 4 is slightly raised by jacking up so that the lower end of the tubular body 1 is slightly lifted from the base member 23, and the tubular body suspension member 5 holds the lower side of the tubular body 1. To do. In this holding state, the barrel 1 is cut at the set barrel cutting position, and is vertically divided to remove the dismantling piece 7 of the barrel 1 (also referred to as a cutting / removing step, see FIG. 2A). The reason why the dismantling piece 7 of the barrel 1 is removed is to make a space below the cut portion of the barrel 1.
(ii) In the holding and releasing process following the holding process, the vertically extending suspension member 4 is lowered by jacking down, and the lower end of the cylinder 1 is received by the base member 23 of the cylinder 1 and then inserted into the through hole 6a. The heel member 6 that has been removed is removed, and the tubular suspension member 5 is placed in the tubular body 1. Thereby, holding | maintenance of the cylinder 1 in the suspension member 5 for cylinders is stopped.
(iii) Thereafter, when the next cutting / removing step is performed, a through hole 6a is provided at a predetermined height position of the barrel 1 with the lower end of the barrel 1 received by the base member 23 of the barrel 1. The up-and-down extending suspension member 4 is raised by jacking up, and the eaves member 6 is inserted into the through-hole 6 a provided in advance at a predetermined height position of the cylinder 1 from the inside of the cylinder 1. Next, in the holding step, the vertically extending suspension material 4 is slightly raised by jacking up so that the lower end of the tubular body 1 is slightly lifted from the base member 23, and the tubular body suspension member 5 holds the lower side of the tubular body 1. To do. In this holding state, the barrel 1 is cut at the set barrel cutting position, and is vertically divided to remove the dismantling pieces 7 of the barrel 1 (next cutting / removing step). By repeating the above (i) to (iii), the dismantling work of the barrel 1 is completed.

Cylindrical body cutting position described above, so that the cylindrical body 1 corresponding to dismantle piece height h ₁ is obtained, it is preset below the hanging tubular body member 5. Incidentally, the jack-down amount of the holding opening step described above (ii) corresponds to the dismantling pieces height h ₁ (see FIG. 2 (a)).
On the other hand, the steel tower dismantling unit for cutting and removing the main pillar 2a of the steel tower 2 is preferably configured as follows.
(Structure of steel tower dismantling unit)
As shown in FIGS. 1 (a), 1 (b) and 3, 4 (a), (b), the steel tower dismantling unit moves up and down each vertically extending suspension material 9 arranged across the main pillar 2a. The two main column supporting jack devices 8 to be connected, the jack mount 8a on which the two main column supporting jack devices 8 are mounted, and the lower side of the main column 2a are connected to the lower ends of the vertically extending suspension members 9. And a main column suspension member 10 holding the main column suspension member 10 and a cutting means (not shown) for cutting the main column 2a at the main column cutting position below the main column suspension member 10. As the vertically extending suspension member 9, it is preferable to use a step rod, and it is desirable to use a step rod penetrating jack device as the main column supporting jack device 8.

Further, as a cutting means for cutting the main pillar 2a, for example, a gas cutting torch or a rotary cutting desk can be used. The jack mount 8a equipped with the two main column supporting jack devices 8 stops the holding of the main column 2a by the main column suspension member 10 and receives no load from the main column 2a. It is placed on a jack gantry moving fixed beam 13 so that it can move toward it (see FIG. 3). The fixed beam 13 for moving the jack mount, on which the jack mount 8a is mounted, is composed of two beams arranged at a predetermined interval, and the lengthwise ends thereof are the base members 23, 24 of the cylinder 1 and the main column 2a, respectively. It is fixed to. In this way, using the existing base members 23 and 24, the location of the main column 2a held by the main column suspension member 10 is increased as the location of the upper portion of the tower 2 becomes higher in the structure of the tower support structure. However, since it approaches the cylinder side, it is preferable because the fixed beam 13 for moving the jack cradle can be constructed (see FIG. 4A).
(Structure of beam structure 12 and its operation)
The steel tower dismantling unit further includes a beam structure 12 that receives a load from the main column 2a by connecting the main column suspension members 10 passed from the two main column support jack devices 8 to each other. The structure 12 is placed on the jack gantry moving fixed beam 13 so that the structure 12 can move toward the cylinder side when receiving no load from the main pillar.

By having such a beam structure 12, two main units are received by receiving a load from the main column 2 a via the main column suspension members 10 passed from the two main column support jack devices 8. The column supporting jack device 8 can be prevented from being loaded from the main column 2a.
In this case, receiving the load from the main column 2a by the beam structure 12 through the main column suspension members 10 passed from the two main column support jack devices 8 is referred to as "load change". That is, by “load changing”, the jack mount 8a on which the two main column supporting jack devices 8 are mounted can be prevented from being subjected to the load from the main column 2a, and the two units not receiving the load from the main column 2a can be prevented. The jack mount 8a on which the main column supporting jack device 8 is mounted is moved toward the cylinder side.

On the other hand, when the load is received from the main column 2a via the main column suspension member 10 by the two main column support jack devices 8, the beam structure 12 not receiving the load from the main column 2a is tubed. Can move toward the body.
Here, the beam structure 12 has two beams 12a that are arranged on the left and right sides with a predetermined interval therebetween and that can be fastened to the main column suspension member 10 after the main column suspension member 10 is placed thereon. The two beams 12a arranged on the left and right sides separated by a predetermined distance are connected to two beams 12b each having a predetermined length that is long in the lateral direction at the end on the cylinder side and the end on the anti-cylinder side. The structure 12 is configured (see FIGS. 3, 4A, 4B, and 5).

  The predetermined length of the two beams 12b that are long in the horizontal direction is a length that allows the end in the horizontal direction to be placed on the fixed beam 13 for moving the jack rack. It is desirable to provide, for example, a plurality of rollers that are effective when moved at the lateral ends of the two beams 12b that are long in the lateral direction. According to the plurality of rollers provided at the lateral ends of the two beams 12b, when moving the beam structure 12 not receiving a load from the main pillar 2a in the cylinder direction by "load change", a plurality of rollers Since this roller becomes effective, the beam structure 12 can smoothly move on the fixed beam 13 for moving the jack rack. As the drive means for moving the beam structure 12 that is not receiving a load from the main column 2a in the cylinder direction, a drive motor, a hydraulic cylinder, or the like can be used to move the beam structure 12 easily. preferable. The reason why the beam structure 12 not receiving a load from the main pillar 2a is moved toward the cylinder side is that the steel tower 2 is lowered together with the cylinder 1 in the method of the present invention, and the main structure is cut at the main column cutting position. In order to repeat cutting / removing the lower side of the pillar 2a, the position where the main pillar suspension member 10 is fastened closer to the barrel side as the location of the upper part of the tower 2 is increased. (See FIG. 4 (a)).

Mainstay cutting position above, as shown in FIG. 4 (a), so that the primary post 2a corresponding to the dismantling pieces height h ₂ is obtained is preset below the hanging main post member 10. Note that the jackdown amount in the holding and opening process described below corresponds to the dismantling piece height h ₂ (see).
Here, in order to cut the main column 2a at a preset main column cutting position, at least two main column suspension members 10 described below are prepared. And as a holding means for holding the lower side of the main pillar 2a, a main pillar suspension member 10 and a through hole 10a for inserting the main pillar suspension member 10 from the outside into a peripheral surface at a predetermined height position of the main pillar 2a , 10a ′ are provided in advance.
(Structure of main pillar suspension member 10 and its action)
As shown in FIGS. 4A and 4B, the main pillar suspension member 10 may be a member that is long in the lateral direction perpendicular to the vertical direction, for example, a shape steel. A main pillar suspension member 10 is detachably attached at right angles to the lower end portion of the vertically extending suspension member 9 through the lower end portions of the vertically extending suspension member 9 through through holes provided at both ends in the lengthwise direction of the laterally long member. Link. In this case, the nut 9a was screwed into a screw formed at the lower end of the vertically extending suspension member 9 so that it could be detached.

A through hole 10a (shown in the X2-X2 cross section) provided at a predetermined height position of the main pillar 2a is used in the cutting / removing step, and is provided in the main pillar 2a above the through hole 10a. The through hole 10a ′ is used for the next cutting / removal. The peripheries of the through holes 10a and 10a ′ into which the main pillar suspension members 10 are inserted may be appropriately reinforced.
FIGS. 4 (a) in, dismantled piece 11 of the primary posts 2a is in the cutting and removing step, after cutting, indicates the portion of the main column 2a is removed, h ₂ is the dismantling of the main pillars 2a is a partial Indicates half height.

The operation of at least two main column suspension members 10 is as follows.
(I) After using one main pillar suspension member 10 and inserting it into a through hole 10a (shown in the X2-X2 cross section) provided in advance at a predetermined height position of the main pillar 2a, the vertically extending suspension material 9 Connect to the lower end of Next, in the holding step, the vertically extending suspension material 9 is slightly raised by jacking up, the main column suspension member 10 is lifted from the two beams 12a of the beam structure 12, and the main column 2a is suspended by the main column suspension member 10. The main pillar 2a is cut and removed at the cutting position below the main pillar suspension member 10 in this holding state (the cutting / removing step). The main pillar 2a is removed, and a space below the cut portion of the main pillar 2a is opened.

 (ii) After that, in the holding and releasing step following the holding step, the main column suspension member 10 is lowered by jacking down, and the main column suspension member 10 is placed on the two beams 12a of the beam structure 12, The main column suspension member 10 and the two beams 12a of the beam structure 12 are tightly coupled (portion indicated by a two-dot chain line in FIG. 4A). Thus, by performing “load change” from the two main column supporting jack devices 8 to the beam structure 12, the two main column supporting jack devices 8 are not subjected to a load from the main column 2a. To do.

Thereafter, the connection between the lower ends of the vertically extending suspension members 9 and the main column suspension members 10 tightly coupled to the two beams 12a is disconnected. Next, after lifting the main column suspension member 10 by jacking up, the jack mount 8a of the main column support jack device 8 not receiving a load from the main column 2a is moved by a predetermined amount toward the barrel side.
(iii) Subsequently, after inserting another prepared main column suspension member 10 into the through hole 10a ′ above the through hole 10a among the two through holes provided in the upper and lower stages, the main column suspension The member 10 and the lower end of the vertically extending suspension member 9 are connected. Next, the vertically extending suspension member 9 is slightly raised by jacking up, the lower side of the main column 2a is held by the main column suspension member 10, and the main column suspension member 10 inserted into the through hole 10a 'in this retained state. The main pillar 2a is cut and removed at the cutting position below (the next cutting and removing step). By repeating the above (i) to (iii), the dismantling work of the main pillar 2a is completed.

When the beam structure 12 is not receiving a load from the main column 2a, that is, the two main column supporting jack devices 8 hold the main column 2a with the main column suspension member 10, and the two main columns 2a. When receiving a load from the main column 2a by the supporting jack device 8, the supporting jack device 8 is moved by a predetermined amount toward the barrel side.
By the way, the holding means for holding the lower side of the main column 2a is not limited to the suspension member / through hole insertion method in which the main column suspension member 10 is inserted into the through hole provided on the peripheral surface of the main column 2a. For example, without providing the through-holes 10a and 10a ′, a split suspension member obtained by dividing the main pillar suspension member 10 into two at the center in the length direction is located above the main pillar cutting position (FIGS. 4A and 4B). It may be fixed to the through holes 10a and 10a ′ by welding or bonding (referred to as a divided hanging piece joining method).
(Refer to the structure and operation of the jack mount 8a, FIG. 3 and FIG. 4 (a))
The jack base 8a on which the two main column supporting jack devices 8 are mounted is such that the main column 2a is not held by the main column suspension member 10 and no load is received from the main column 2a. It is placed on the jack mount moving fixed beam 13 so that it can move toward (see FIG. 3). The reason for this is that in the method of the present invention, the tower 2 is moved down together with the barrel 1 and the lower side of the main pillar 2a is repeatedly removed and removed at the main pillar cutting position. This is because the portion of the main pillar 2a held by the main pillar suspension member 10 is closer to the barrel side as the position becomes (see FIG. 4A). For example, it is preferable that a plurality of rollers that are effective when moved are provided at the lower end portion of the jack mount 8a, and a drive motor, a hydraulic cylinder, and the like are provided as drive means. In this way, when the jack mount 8a on which the main column supporting jack device 8 not receiving a load from the main column 2a moves, a plurality of rollers become effective, and the jack mount 8a can be easily moved. Can do. Further, it is desirable that the jack mount 8a can be locked to the jack mount moving fixed beam 13 with a stopper, for example, when the movement is stopped. The reason for this is that when the main column suspension member 10 holds the lower side of the main column 2a and an unexpected strong wind or earthquake occurs, the main column 2a is moved from the main column 2a to the main column suspension member 10. This is because the horizontal component force in the direction acts to counter this.

Here, the jack mount 8a on which the two main column supporting jack devices 8 are mounted preferably has the following mount structure (see FIG. 3). The jack gantry 8a is composed of a plurality of gantry beams fixed in parallel with the gantry moving direction, four gantry columns arranged at the four corners of the gantry beams and having upper ends fixed to the gantry beams, a plurality of horizontal beams. It consists of a member and an oblique member. Further, on the side facing the barrel side of the jack mount 8a, the horizontal member and the diagonal member are not arranged, but the truss structure supporting point steel frame, the horizontal member, and the diagonal member fixed to the main column 2a descending from above It is preferable to provide an opening so that the member does not interfere with the jack mount 8a.
(Anti-lifting device for main pole suspension member 10)
If unforeseen strong winds or earthquakes occur during the dismantling operation, the tower-supported structure may fall over if the relatively heavy cylinder shakes excessively. Therefore, it is preferable that the steel tower disassembly unit is further provided with a device for preventing the main pillar suspension member 10 from being lifted (see FIG. 5).

  The anti-lifting device is such that the threaded portion 14a is formed from the upper end with a length corresponding to the amount of lifting of the vertically extending suspension material 9 and the lower end is connected to the rotating means 17, and the threaded portion 14a penetrates. And nuts 15 which are arranged with a plurality of through holes 15b provided at a plurality of positions on the main pillar suspension member 10 and screwed to the screw portion 14a and provided with a common rotation stopper (not shown) above the main pillar suspension member 10. And a bearing 16a that rotatably receives the lower part of the threaded rod 14, and a bearing retainer 16b fixed to the lower part of the threaded rod 14. As shown in FIG. 5, the threaded rod 14 connects the lower left and right sides of the jack mount 8a and penetrates the connecting member 8b disposed below the jack mount 8a of the main column support jack device 8. The movement in the vertical direction is restricted and rotatable by the bearing 16a and the bearing retainer 16b. Here, the diameters of the through holes 15b provided at a plurality of locations of the main column suspension member 10 are larger than the threaded portion 14a of the threaded rod 14.

  Accordingly, as the vertically extending suspension member 9 is moved up and down, the threaded rod 14 is rotated by the rotating means 17 to change the length of the screw portion 14a protruding above the main column suspension member 10, and an unexpected strong wind Even when an earthquake or an earthquake occurs, the pulling force can be resisted through the nut 15 screwed into the screw portion 14a. As a result, the tower-supporting structure can be prevented from falling over by the device for preventing the main pillar suspension member 10 from rising.

  At this time, the rotation of the motor 17 is controlled so that the gap G between the main pole suspension member 10 and the nut 15 is maintained at, for example, about 5 mm. The reason for this is that if the interval G is excessive, the impact force received by the nut 15 tends to increase when the main pillar suspension member 10 is lifted, and conversely, if the interval G is excessively small, This is because it is difficult to move the main pole suspension member 10 and an excessive force is applied to the vertically extending suspension member 9.

  Moreover, the more preferable form of the lifting prevention apparatus for the main pole suspension member described above is as follows. The through-hole 15b through which the threaded portion 14a of the threaded rod 14 passes is provided symmetrically with the vertically extending suspension material 9 in two positions in the length direction of the main pillar suspension member 10, and the threaded rod 14 is rotated. The rotation means is a motor, the detector for detecting the interval G and the control device for controlling the interval G to be constant, the detector for detecting the load acting on the two main column support jack devices 8 and the load And a control device that stops the rotation of the threaded rod 14 and the operation of the main column support jack device 8 when the measured value of the load exceeds the threshold value by comparing the measured value of is there.

  In addition, the steel tower dismantling unit is further unreasonable toward the main column supporting jack device 8 via the main column suspension member 10 holding the main column 2a in the anti-cylinder direction by expanding the space between the main columns. In order to prevent excessive force from being applied, a tension member for connecting adjacent or opposing main columns is provided near the height position of the main column suspension member 10 below the main column supporting jack device 8. Is preferred.

  The reason for this is that the steel tower 2 is lowered close to the ground together with the barrel 1 by the method of the present invention, and the supporting point steel frame, the horizontal member, the diagonal member, etc. fixed to the main pillar 2a of the steel tower 2 descending. Is disassembled near the height position of the main column suspension member 10, it is impossible for the main column support jack device 8 to generate an increase in the interval between the adjacent main columns 2 a due to the tensile force generated in the tensile material. It is because it can suppress effectively that force acts.

The method of the present invention can be realized by the cylindrical body dismantling unit and the steel tower dismantling unit described above.
In the method of the present invention, with the structure in which the cylindrical body 1 is supported from the periphery by the supporting point steel frame 1a, the steel tower 2 is lowered to the ground together with the cylindrical body 1, and the supporting point constituting member 1a on the steel tower side is lowered. The dismantling work of the steel tower components including 1b (the horizontal member 2b fixed to the main pillar 2a, the slanting member 2c) is performed using a dismantling machine installed on the ground, and the lower side of the barrel 1 and the main pillar 2a When cutting and removing the lower side, the cutting position of the cylinder 1 and the cutting position of the main pillar 2a are set to be the same. The dismantling operation of the steel tower component is performed below the main column supporting jack device, preferably near the lower side of the main column suspension member.

  According to the method of the present invention, the dismantling work of the supporting point constituent members 1a and 1b on the tower side, and the dismantling work of disassembling the horizontal member 2b and the oblique member 2c fixed to the main pillar 2a of the tower 2 are performed. While performing near the height position of the main column suspension member below the apparatus, the barrel cutting position and the main column cutting position are set below the respective suspension members (FIGS. 2 to 4). Therefore, in order to stabilize the horizontal direction of a relatively heavy cylinder, a guide roller that supports the cylinder in contact with the outer peripheral surface of the cylinder instead of the cylinder support ring 1b that is a support point constituent member on the tower side. Is not required to be newly provided on the steel tower side, and the dismantling work for dismantling the steel tower at a high place can be eliminated, so that the dismantling work can be performed more safely.

  The demolition work of the chimney having a cylinder 1 height of 100 m, a main pillar interval of 20 m, and a cylinder outer shape of 4.6 m was planned. In the case of the conventional dismantling method, the work of dismantling the steel tower 2 supporting the cylinder 1 having a height of 100 m from the surrounding with the supporting point steel frame 1a of the truss structure at a high place or using a huge crane 100 for dismantling the steel tower It was necessary to repeat the work of lifting the dismantling piece 22 of the dismantled tower 2 and hanging it down to the ground (FIG. 7B). Furthermore, it is necessary to provide guide rollers for holding the barrel 1 and preventing collapse at at least three locations in the circumferential direction of the barrel support ring 1b on the steel tower 2 side.

In contrast, in the case of the method of the present invention, the dismantling equipment as shown in FIGS. It was set as the dismantling method which sets a position so that it may become the same 8m. That is, when cutting in one, dismantling piece and the height h ₂ of dismantling pieces height h ₁ and the primary posts 2a of the tubular body 1 are the same. In addition, when the dismantling piece of the cylinder 1 is comparatively heavy, when lowering each suspension member by jacking down, it is compared by a dismantling work plan that cuts the cylinder 1 and the main pillar 2a in two to four times. To stabilize the heavy cylinder 1 in the horizontal direction, as shown in FIG. 2 (a), to suppress the height of the dismantled piece of the cylinder 1 to be carried out sideways, and to avoid interference with the tower 2, etc. It can be expected that the work at a high place can be reduced and it can be dismantled more safely.

L Length from the center of the cylinder suspension member to the tip of each arm part ₁ Height of the disassembly piece h of the cylinder ₂ Disassembly piece height G of the main column Gap between the main column suspension member and the nut 1 Chimney (cylinder Body)
1a Supporting point steel frame
1b Tube support ring
1c Ring Gata 2 Steel Tower
2a Main pillar
2b Horizontal member
2c Diagonal member 3 Tube support jack device
3a Jack mount 4 Vertically extending suspension material (step rod)
5 Cylinder suspension member 6 Claw member
6a Through hole 7 Demolition piece 8 Main column support jack device
8a Jack mount
8b Connecting member 9 Vertically extending suspension material (step rod)
9a nut
10 Main column suspension
10a, 10a 'through hole
11 Demolition pieces
12 Beam structure
12a, 12b Beam of beam structure
13 Fixed beam for moving the jack mount
14 Threaded rod
14a Screw part
14b bottom
15 nut
15b Through hole
16a Bearing
16b Bearing retainer
17 Motor
18 Control unit
20 Tube support jack device
21, 22 Demolition piece
23, 24 Foundation materials
100 giant crane

Claims (7)

A dismantling facility for dismantling a tower-supported structure having a structure in which a cylindrical body is supported by a supporting point steel frame fixed to the main pillar of the tower from the surroundings,
The barrel body disassembly unit for cutting and removing the barrel body includes a barrel body supporting jack device that lifts and lowers the vertically extending suspension material, and the barrel body supporting jack device mounted on the inside of the barrel body. A jack mount installed on the base member of the cylindrical body, and a tubular suspension member connected to the lower end of the vertically extending suspension member and holding the lower side of the cylindrical body,
The tubular suspension member has a structure that fits inside the tubular body, and has a plurality of arm portions that extend toward the peripheral surface of the tubular body, and the tubular suspension member includes each arm portion. The dismantling equipment for the tower-supported structure is characterized by having holding means inserted from the inside into through holes provided at a plurality of circumferential positions of the cylindrical body. The tower dismantling unit for cutting and removing the main pillars of the tower includes two main pillar supporting jack devices for raising and lowering the vertically extending suspension members arranged between the main pillars, and two main pillars A jack stand with a supporting jack device;
A main pillar suspension member connected to the lower end of each vertically extending suspension and holding the lower side of the main pillar,
The jack base of the main column support jack device can be moved toward the barrel side when the main column suspension member stops holding the main column and receives no load from the main column. The dismantling equipment for a tower-supported structure according to claim 1, wherein the dismantling equipment is mounted on a fixed beam for moving a jack stand.   The jack gantry moving fixed beam is composed of two beams arranged at a predetermined interval, and the lengthwise ends thereof are fixed to the cylindrical body and the base member of the main column, respectively. The dismantling equipment for the tower-supported structure according to claim 2.   The steel tower dismantling unit further includes a beam structure that receives a load from the main column by tightly coupling main column suspension members passed from the two main column support jack devices. 4. The tower support type according to claim 2, wherein the structure is placed on the jack gantry moving fixed beam so that the structure can move toward the barrel side when receiving no load from the main pillar. 5. Structure dismantling equipment.   The tower dismantling unit further includes a lifting prevention device for the main pillar suspension member, the lifting prevention device having a threaded portion formed from the upper end to a length corresponding to the lifting amount of the vertically extending suspension member and having a lower end at the bottom end. A threaded rod connected to the rotating means; a through hole provided in a plurality of positions of the main pillar suspension member so that the threaded portion penetrates; and an upper portion of the main pillar suspension member screwed into the threaded portion. And a bearing holder rotatably receiving the lower part of the threaded rod, and a bearing retainer fixed to the lower part of the threaded rod, the threaded rod for supporting the main column Connects the left and right of the lower part of the jack mount with the jack device and penetrates the connecting member arranged below the jack mount, and the vertical movement is restricted by the bearing and bearing retainer. And rotating the threaded rod to change the length of the threaded portion protruding above the main pillar suspension member as the vertically extending suspension material moves up and down, and the main pillar For detecting the load acting on the supporting jack device, comparing the measured value of the detected load with a preset threshold value, and for rotating the threaded rod and supporting the main column when the measured value of the load exceeds the threshold value The tower-supporting structure according to any one of claims 2 to 4, wherein by stopping the operation of the jack device, a pulling force can be resisted through a nut screwed into the screw portion. Equipment dismantling facilities.   In addition, the steel tower dismantling unit further applies an unreasonable force in the anti-cylinder direction to the main column supporting jack device via a main column suspension member that extends between the main columns and holds the main column. In order to prevent this, a tension member for connecting adjacent main columns is provided near the height position of the main column suspension member below the main column supporting jack device. The dismantling equipment of the steel tower support type structure as described in any one of -5.   A dismantling method for dismantling a tower-supporting structure having a structure in which a cylindrical body is supported by a supporting point steel frame fixed to a main pillar of a steel tower from the surroundings, and the dismantling method according to any one of claims 1 to 6. Using the dismantling equipment for the tower-supported structure and lowering the tower to the vicinity of the ground together with the cylinder while maintaining the structure in which the cylinder is supported from the surrounding by the supporting point steel frame, The dismantling work of the steel tower structural member including the support point steel frame of the truss structure fixed to the column and the cylindrical support ring fixed to the support point steel frame is performed using a dismantling machine installed on the ground, and the lower part of the cylinder A dismantling method for a tower-supported structure characterized in that when cutting and removing the side and the lower side of the main pillar, the cylindrical cutting position and the main pillar cutting position are set to be the same.

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