JP2009073599A - Supporting structure of tower crane and climbing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of reinforcements such as a receiving trestle, a beam and the like for receiving the lower end of a most by reducing a vertical load, and to promote efficient relocation work by simplifying the supporting structure of the mast. <P>SOLUTION: This tower crane 1 loads and fixes a working platform 44 provided in an upper part of the mast 3 and movably provided along the mast 3 on a main beam of a predetermined floor height. In a mast lower end support part 20, the loading state of the lower end 3a of the mast 3 is released and the mast 3 is raised by making a reaction force act on the working platform 44 and a second receiving beam 23 is arranged in an opening for mast insertion and the lower end 3a of the raised mast 3 is loaded on the second receiving beam 23 to form the mast lower end supporting part 20. A horizontal supporting part 30 for horizontally supporting an intermediate part of the mast 3 by a jack capable of extending and contracting a clearance between the mast 3 and the opening and the working platform 44 is raised along the raised mast 3 to an upper part of the mast 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tower crane support structure and a climbing method.

In general, a tower crane has a cross base (base mount) in which beams are arranged in a cross shape on the base floor, a mast is rigidly connected to the base mount, and the mast is covered on the top of the mast. A climbing lifting device is inserted and supported so as to be movable in the vertical direction, and a crane main body having a jib, a lifting mechanism, and the like is attached via a swivel connected to the upper portion of the lifting device.
And floor climbing that installs a mast inside the building is to climb the support part at the lower end of the mast of the tower crane to the upper layer according to the building height of the building, specifically as follows Climbing is carried out in the same way. That is, an opening for raising the base gantry from below is provided in the building, and the lifting device is fixed to the uppermost floor under construction, and the base gantry is released from the base floor. Subsequently, the hydraulic cylinder of the lifting device is operated to raise the mast together with the base frame, and the base frame is fixed to the column beam on the intermediate floor. Then, the lifting device, that is, the crane body at the turning portion is climbed to the top of the mast. While repeating these procedures, it is raised with the construction of the building. One example of such a tower crane by floor climbing is described in Patent Document 1.
Patent Document 1 discloses a base frame, a hydraulic telescopic frame (elevating device) provided under the base frame, and a horizontal frame that is provided at an intermediate portion of the mast and is fixed to a building frame. A tower crane having a mast with a force support is described.

  By the way, in recent years, a building having a hybrid structure including an RC core wall, an outer peripheral column, and a steel beam built on the core wall and the outer peripheral column has been constructed. Because of the structural features of hybrid buildings, it is common practice to use a laminated construction method in which floor concrete is laid on each floor according to the way the columns and beams are built. When building a building with such a hybrid structure, if a tower crane is installed inside the building, the external dimensions of the cross base (base rack) may be larger than the minimum pitch of the steel beam. In that case, keep the state where the steel beam is pulled out at the opening where the mast is placed, and after climbing the tower crane and moving the base frame to the upper floor, perform the work to retrofit the missing steel beam Yes. The post-construction of this steel beam is underneath the base frame after climbing, and it takes time to carry in and install the steel beam in the state after the floor concrete is cast by the laminating method. It was.

Thus, Patent Document 2 discloses a mast climbing tower crane that lifts only the mast by separating the base frame from the mast.
In Patent Document 2, when the mast is raised from the basic floor to a predetermined floor height, the mast and the base frame are separated from each other, and a frame (climbing base) such as a steel material is installed on the floor concrete on the intermediate floor. Climbing with the lower end of the mast fixed on the base and the upper part of the mast fixed and supported by the climbing base, and a wedge is driven between the opening and the mast at the middle of the mast to restrict horizontal movement The method is described. In this case, since it is not necessary to lift the base frame together with the mast, the size of the opening formed in the floor concrete can be set to the minimum necessary size through which the mast can pass. It is possible to eliminate the need for construction.
JP-A-2005-22819 JP 2000-248632 A

However, in Patent Document 1, since the base frame is sequentially raised and installed on the middle floor of the building, and a horizontal force support is installed in the middle part of the mast and the tower crane has a heavy weight, It was necessary to reinforce the strength of the beam supporting the base mount in In other words, for example, it is necessary to increase the strength of the beam by installing multiple temporary support columns directly below the steel beam that supports the floor concrete, such as carrying in, installing, and removing the support columns. There is a problem in that the work labor is large under the floor concrete and the construction efficiency is lowered. In addition, in order to move the base stand together with the mast to the upper floor, the floor concrete opening must be large enough to allow the base stand to pass through. Since it was pulled out, there was a problem that the steel beam was post-construction and the construction efficiency was reduced.
In Patent Document 2, it is necessary to perform a climbing base fixing operation at the upper and lower ends of the mast for each climbing, and since the wedge driving operation is performed, the relocation work is large and takes time and effort. was there.

The present invention has been made in view of the above-described problems, and a tower crane support structure and climbing that can reduce reinforcement of a receiving frame, a beam, and the like that receive a lower end portion of a mast by reducing a vertical load. It aims to provide a method.
Another object of the present invention is to provide a tower crane support structure and a climbing method that can simplify the mast support structure to improve the efficiency of relocation work.

  To achieve the above object, a tower crane support structure according to the present invention is provided with a mast and a crane body that is movable up and down along the mast in a state where the upper part of the mast is inserted and supported, A tower crane support structure in which a mast is arranged in an opening formed in floor concrete of each floor in the mast, and a mast lower end support part in which a receiving stand for receiving the lower end part of the mast is provided in the opening part, and an intermediate part of the mast Is provided with a horizontal support portion for horizontally supporting the frame by a jack interposed between the mast and the opening.

  Further, in the climbing method of the tower crane according to the present invention, a mast lower end support portion provided in a mast insertion opening formed in the floor concrete of each floor of the building, and a mast lower end support portion that receives the lower end portion of the mast, The horizontal support part that supports the part in the horizontal direction with a jack that can expand and contract the distance between the mast and the opening part in the opening part, and can be moved up and down along the mast with the upper part of the mast inserted and supported A climbing method for a tower crane that climbs by providing a crane body, in the mast lower end support part, releasing the mounting state of the lower end part of the mast, raising the mast, and installing a receiving stand in the opening And a step of receiving a lower end portion of the raised mast and placing it on a pedestal to form a mast lower end support portion, and a horizontal portion for supporting an intermediate portion of the mast A step of providing a holding portion, and a step of raising the crane body to the top of the mast along the raised mast after providing the mast lower end support portion and the horizontal support portion, and repeating these steps sequentially It is characterized by climbing at.

  In the present invention, the vertical load (vertical load) due to the tower crane's own weight and the reaction force during lifting work is received by the mast lower end support part, and the moment load (horizontal force) applied to the mast at the mast middle part is also received. Can be handled by a horizontal support. Therefore, in the mast lower end support part, the vertical load due to the moment load does not act compared to the case where the mast is erected on the base frame like the conventional tower crane, and only the base frame is fixed and supported independently. Can be small.

  Further, in the tower crane climbing method according to the present invention, the crane body is provided with a gantry equipped with a lifting device, and the gantry is placed and fixed on a main beam of a predetermined floor height when climbing, and a reaction force is applied to the gantry. It is preferable to raise the mast by taking

  In the present invention, when the span of the permanent beam is small, the lifting device and the permanent beam can be prevented from interfering with each other by placing the gantry on the permanent beam.

  Further, in the climbing method of the tower crane according to the present invention, at a predetermined height from the basement floor of the building, a base frame is provided on the basement floor, the mast is erected on the base frame, the mast is raised to a predetermined height, It is preferable that the base frame is detached from the mast after ascending to release the mounting state of the lower end portion of the mast.

  In the present invention, when the building construction reaches a predetermined height, for example, while constructing the building to the height of the building where this climbing method can be adopted, the lower end of the mast is detached from the base frame, and the mast is raised. After that, a mast lower end support portion formed by placing the lower end portion of the mast on the floor concrete on the middle floor of the building can be formed.

  According to the tower crane support structure and climbing method of the present invention, the base frame such as the cross base is not lifted together with the mast, so that its own weight can be reduced. Thus, compared to the case where the mast is erected on the base frame and the base frame alone is fixed and supported by itself, the vertical load due to the moment load does not act, so the vertical load can be reduced. Therefore, since the support reaction force (installation reaction force) at the mast lower end support portion is reduced, it is possible to reduce the reinforcement of the receiving frame and the beam that receive the lower end portion of the mast. Moreover, since it is a simple support structure that receives the lower end of the mast with a pedestal and horizontally supports the middle part of the mast with a jack, the labor and time required for the transfer work can be reduced, and work efficiency can be improved. be able to.

Hereinafter, a tower crane support structure and a climbing method according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side view showing the configuration of a tower crane according to an embodiment of the present invention, and shows a state in which a mast is installed on a base floor, FIG. 2 shows a mast lower end support part and a horizontal support part, FIG. FIG. 4 is a cross-sectional view taken along the line A-B shown in FIG. 2, FIG. 5 is a cross-sectional view taken along the line C-C shown in FIG. 2, and FIGS. FIG. 7 is a side view for explaining the floor climbing process of the tower crane, and FIGS. 7A and 7B are side views for explaining the floor climbing process following FIG. 6C.

  As shown in FIG. 1, the tower crane 1 according to the present embodiment is installed inside a building constructed by a laminated construction method in which floor concrete is placed for each floor in accordance with how to build columns and beams, for example. The installation load of the mast lower end support part (the reaction force that receives the load acting downward in the vertical direction of the tower crane 1 (hereinafter referred to as “vertical load”)) is not required. It was made small and climbed. The tower crane 1 is applied to an existing tower crane for floor climbing.

First, the outline | summary is demonstrated about the building constructed by arrange | positioning this tower crane 1 inside.
As shown in FIG. 1, in the building according to the present embodiment, the rising structure from the first floor F1 to the third floor F3 is an SRC structure, and the floor height is also different. It is the standard floor of a long steel beam hybrid structure. In the floor concrete 11 of each floor F1, F2,..., An opening 12 (see FIGS. 2 to 5) for penetrating the mast 3 at a coaxial position in the vertical direction is formed. The position of the opening 12 is arranged between the main beams 13 and 13 (see FIG. 3) on each floor of the building.

Next, the configuration of the tower crane 1 will be described in more detail based on the drawings.
As shown in FIG. 1, the tower crane 1 is installed on the floor concrete 11 on the first floor (foundation floor F1) of the building while the building is built up to the height of the building where climbing according to this embodiment is possible. A cross base 2 (base mount) in which beams are arranged in a cross shape in a plan view, a mast 3 erected on the cross base 2, and an upper portion of the mast 3 are disposed, and the mast 3 is fixed on the swivel base 5, a lifting device 4 provided to be movable up and down along the mast 3, a swivel base 5 provided on the top of the lift device 4. A crane main body 6 provided with a jib, a lifting device and the like is schematically configured.

  After the climbing of the present embodiment is possible, the tower crane 1 is constructed by arranging the mast 3 in the opening 12 (see FIGS. 2 and 3) formed in the floor concrete 11 of each floor of the building. The mast 3 is supported by a support structure (mast lower end support portion 20, horizontal support portion 30) to be described later on an intermediate floor of the building (see FIG. 6).

  As shown in FIG. 1, the mast 3 is formed in a square shape in a cross-sectional view with a steel material or the like, and is configured to be able to add a plurality of pieces of a predetermined length in the length direction. As will be described in detail later, the vertical load applied to the mast 3 (that is, the load due to the weight of the tower crane and the reaction force during suspension work) is received by the cross base 2 when the cross base 2 is installed. After the base 2 is cut off, the lower end 3a of the mast 3 is placed on the bundle 21 at a predetermined height on the middle floor and supported by the main beam 13 via the bundle 21 (described later). To form).

  The lifting device 4 is disposed between the upper lifting frame 41 through which the mast 3 is inserted, the lower lifting frame 42 positioned below the upper lifting frame 41, and the upper lifting frame 41 and the lower lifting frame 42. And a gantry 44 provided with a frame so as to surround the upper and lower lifting frames 41 and 42. The upper elevating frame 41 and the lower elevating frame 42 are each provided with a lock pin (not shown) that can be fixed and released by being inserted into the mast 3.

The lifting / lowering device 4 is resized by expanding / contracting the lifting / lowering jack 43 while alternately fixing or releasing the upper lifting / lowering frame 41 and the lower lifting / lowering frame 42 with respect to the mast 3 by the lock pin. 6 can be raised along the mast 3 sequentially.
The gantry 44 is attached to the upper elevating frame 41 and receives a reaction force when climbing, so that the gantry 44 can be placed and fixed on the main beam 13 having a predetermined floor height. Since the gantry 44 is larger in the dimension of the lifting device 4 of the existing tower crane than the installation span of the main beam 13, the lifting device 4 and the main beam 13 do not interfere with each other.

Next, the structure of the support structure for supporting the mast 3 will be described.
Here, FIGS. 2 and 3 show the fixed state of the mast 3 when the tower crane 1 is installed inside the building on the middle floor after the cross base 2 is detached. As shown in FIGS. 2 to 6, this support structure supports the mast 3 with respect to the building, and includes a mast lower end support portion 20 that supports a lower end portion 3 a of the mast 3 and an intermediate portion of the mast 3. It comprises a horizontal support portion 30 that receives a horizontal force.

  6B and 7A, the climbing reaction force is applied from the gantry 44 to the bundle 21 while the gantry 44 is placed on the bundle 21 during climbing. It is transmitted to the main beam 13 through.

  As shown in FIGS. 2 to 4, the mast lower end support portion 20 is substantially parallel to the bundle material 21 provided on the floor concrete 11 at a position where the main beam 13 is provided and to the bundle materials 21 and 21. And a pair of first receiving beams 22 and 22 (supporting bases) made of H-shaped steel material and the like arranged at a predetermined interval, and a bridge so as to be orthogonal to the first receiving beams 22 and 22. It consists of a pair of 2nd receiving beams 23 and 23 (support stand) arrange | positioned substantially parallel.

  The second receiving beams 23, 23 are disposed in the opening 12, and the interval between the second receiving beams 23, 23 is set to be smaller than the length dimension of one side of the mast 3 in plan view. The second receiving beam 23 is for placing the lower end portion 3a of the mast 3 from which the cross base 2 is separated, and effectively transmits the vertical load of the tower crane 1 to the building via the main beam 13. It is what I did.

  As shown in FIGS. 2, 3, and 5, the horizontal support portion 30 is a support structure in which horizontal support jacks 31, 31,... Are interposed between the mast 3 and the opening portion 12. The horizontal support jack 31 is provided at the corner of the mast 3 and is fixed so as to be pressed in the axial direction of the beam on each of the four sides of the mast 3 to horizontally support the mast 3. That is, the horizontal support portion 30 supports the mast 3 in the middle portion (intermediate portion) in the height direction, and mainly receives the force in the horizontal direction.

  Thereby, the mast 3 and the floor concrete 11 can be couple | bonded integrally, and the horizontal force by the moment concerning the tower crane 1 whole can be transmitted to a building. Therefore, the moment applied to the mast 3 can be supported by the floor concrete 11, that is, the building. That is, the movement of the mast 3 in the horizontal direction is restricted by the horizontal support portion 30, and the lateral blur (displacement in the horizontal direction) of the mast 3 can be reliably restricted. Therefore, only the vertical load of the tower crane 1 (the weight of the tower crane 1 and the reaction force during the suspension work) is applied to the mast lower end support portion 20, and the load on the main beam 13 and the column can be reduced. .

Next, a method for floor climbing by installing the tower crane 1 in a building will be described with reference to the drawings.
As shown in FIG. 1, in the floor climbing method of the present tower crane 1, the mast 3 is installed at an appropriate timing according to the progress of the construction after the tower crane 1 is installed in a state where it is self-supporting as usual in the initial stage of construction. The lower end 3a is fixed to the mast lower end support 20 (see FIGS. 2, 3 and 6C) installed on the middle floor from the cross base 2, and the position of the mast lower end support 20 is sequentially changed thereafter. The crane main body 6 is raised by moving to the upper floor.

  That is, the climbing method of the tower crane 1 includes a step (see FIG. 6 (b)) in which the elevating device 4 is mounted on the main beam 13 through the bundle 21 at a predetermined floor height and fixed. The process of releasing the fixation of the lower end portion 3a and raising the mast 3 against the gantry 44 by a reaction force (see FIG. 6B) and the receiving beam (the first receiving beam 22 and the second receiving beam in the opening 12). A step (see FIG. 6C) of installing the receiving beam 23) and placing the lower end portion 3a of the raised mast 3 on the second receiving beam 23 to form the mast lower end support portion 20; 3 (see FIG. 6C), and after providing the mast lower end support portion 20 and the horizontal support portion 30, the gantry 44 along the raised mast 3 is provided. A step (see FIG. 6C) of raising the mast 3 to the top of the mast 3. There. And it is the method of climbing by repeating these processes sequentially.

  More specific description will be given below. As shown in FIG. 1 and FIG. 6A, first, a cross base 2 is fixed on a floor concrete 11 of a basic floor F1 (here, the first floor) in a building with an anchor or the like, and the mast is placed on the cross base 2. 3 is installed substantially vertically in a self-standing state, and a crane body 6 is installed on the top of the mast 3 via a lifting device 4. The mast 3 at this time is disposed in the opening 12 of the building.

Then, according to the construction of the building, the mast 3 for one piece is added to the upper part of the mast 3 and extended, and the crane body 6 is raised along the mast 3 to a predetermined position by the lifting device 4.
Here, when changing the lifting device 4, a lock pin (not shown) is pulled out from the mast 3, the lifting jack 43 shown in FIG. 1 is extended to raise the upper lifting frame 41, and the upper lifting frame 41 is moved at that position. Insert the lock pin into the mast 3 and fix it. Then, the lock pin of the lower lift frame 42 is pulled out from the mast 3, the lift jack 43 is contracted to raise the lower lift frame 42, and the lock pin of the lower lift frame 42 is inserted into the mast 3 and fixed. Thereby, the reordering for one stroke (the floor above the second floor) is completed. By repeating such a reordering operation, the crane body 6 can be raised, for example, by two floors.
Further, the floor concrete 11 on the fifth floor F5 and the seventh floor F7 includes a first receiving beam 22 and a first support beam 22 of a mast lower end support portion 20 (see FIG. 6) for supporting the lower end portion 3a of the mast 3 by floor climbing described later. 2 Install the receiving beam 23 according to the progress of the construction.

  Next, as shown in FIG. 6B, a step of placing and fixing the gantry 44 on the main beam 13 via the bundle 21 at a predetermined floor height (here, 9th floor F9) is performed.

  Subsequently, the fixing of the lower end 3a of the mast 3 is released, and the mast 3 is lifted by using the reaction force applied to the lifting device 4. Specifically, the horizontal support 30 (see FIG. 6A) on the eighth floor F8 is released, and the lower part of the fixed mast 3 (here, the position P1 slightly above the cross base 2) is cross-base. Separate from 2. Then, the mast 3 above the position that is not separated (the position P1) is lifted by using the lifting device 4 while sequentially changing the reaction force against the floor concrete 11 on the ninth floor F9.

  Then, as shown in FIG. 6 (c), a step of placing the lower end 3a of the mast 3 on the second receiving beam 23 shown in FIGS. 2 and 3 to form the mast lower end support 20 is performed. A step of supporting the intermediate position of the mast 3 by the horizontal support portion 30 is performed, and a step of raising the gantry 44 (the crane body 6) to the upper portion of the mast 3 along the raised mast 3 is performed.

  Then, an intermediate portion of the mast 3 (here, two locations of the sixth floor F6 and the ninth floor F9) is arranged at the horizontal support portion 30 at the opening 12 (see FIGS. 3 and 5) of the sixth floor F6 and the ninth floor F9. To support the mast 3 disposed in the opening 12 in the horizontal direction. Here, as shown in FIG. 5, the horizontal support portion 30 is supported by interposing a plurality of jacks 31, 31,... In the gap between the opening portion 12 and the mast 3, and applying a reaction force from the opening portion 12. The jack 31 is extended in a substantially horizontal direction. As a result, the mast lower end support portion 20 on the fifth floor F5 is responsible for the vertical load of the tower crane 1 (the weight of the tower crane 1 and the reaction force during the lifting work) and the horizontal support portions of the fifth floor F5 and the ninth floor F9. 30 is responsible for the moment acting on the mast 3 (fall of the mast 3).

  Further, the mounting state of the gantry 44 on the bundle material 21 is released on the ninth floor F9 (see FIG. 6B), and the crane body 6 is lifted along the mast 3 by the lifting device 4 to complete one-step climbing. It becomes.

  The procedure up to this point is to move the lower end 3a of the mast 3 from the cross base 2 installed on the base floor F1 to the mast lower end support 20 on the fifth floor F5, thereby raising the crane body 6 upward on the second floor. Next, a climbing method and a floor climbing method by moving the mast lower end support portion 20 and the horizontal support portion 30 will be described.

  As shown in FIG. 7 (a), the mast lower end support part 20 on the fifth floor F5, that is, the lower end part 3a of the mast 3 and the second receiving beam 23 (see FIGS. 2 and 3) are released, The mast 3 is lifted by using the lifting device 4 while taking a reaction force against the bundle 21 of the 11th floor F11.

  Then, as shown in FIG. 7B, a step of forming the mast lower end support portion 20 by placing the lower end portion 3a of the mast 3 on the second receiving beam 23 previously set on the seventh floor F7. Further, a step of supporting the intermediate position of the mast 3 by the horizontal support portion 30 at the eighth floor F8 and the eleventh floor F11 is performed, and a step of raising the gantry 44 to the upper portion of the mast 3 along the raised mast 3 is performed. That is, the vertical load receiving base 31 of the raised mast 3 is placed on the second receiving beam 23 installed in the opening 12 (see FIGS. 2 to 4) of the seventh floor F7.

And the middle part of mast 3 (here, two places of the 8th floor F8 and the 11th floor F11) is arrange | positioned by the horizontal support part 30 in the opening part 12 in the opening part 12 of the 8th floor F8 and 11th floor F11. The mast 3 is supported horizontally. Furthermore, the mounting state of the gantry 44 and the bundle material 21 of the 11th floor F11 is canceled (see FIG. 7A), and the gantry 44 (the crane body 6) is raised along the mast 3 by the lifting device 4. The climbing of the second step is completed.
Then, when building a building on the upper floor, the climbing in the second step described above is performed in order while climbing the building.

In the horizontal support 30, the opening 12 is slightly larger than the outer dimension of the mast so that the jack 31 can be interposed between the mast 3 and the jack 31 causes the mast 3 to act on the opening 12 in the horizontal support reaction force. Can be taken.
Further, in the mast lower end support portion 20, the mast 3 is placed on the second receiving beam 23, and both the structures 3 and 23 are not rigidly connected. Therefore, the reaction force acting on the mast lower end support portion 20 Therefore, the reinforcement of the main beam 13 can be minimized, and the labor and cost for the reinforcement can be reduced.

  As described above, in the tower crane support structure and climbing method according to the present embodiment, the cross base 2 is not lifted with the mast 3 and climbed, so that the weight of the mast lower end support portion 20 can be reduced. As compared with the conventional case where the mast is erected on the base gantry and the base gantry is fixed and supported independently, the vertical load due to the moment load does not act, so the vertical load can be reduced. Therefore, since the support reaction force (installation reaction force) at the mast lower end support portion 20 is reduced, the reinforcement of the receiving beams 22 and 23 and the main beam 13 that receive the lower end portion 3a of the mast 3 can be reduced. Moreover, since it is a simple support structure that receives the lower end portion 3a of the mast 3 by receiving the beams 22 and 23 and horizontally supports the mast intermediate portion with the jack 31, it is possible to reduce the labor and time required for the transfer work, Work efficiency can be improved.

The embodiments of the tower crane support structure and the climbing method according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the scope of the present invention. .
For example, although two horizontal support portions 20 are provided for the mast 3 in the present embodiment, the number of horizontal support portions 20 is not limited to two, and may be three or more. There may be.
In the embodiment, the lower end portion 3a of the mast 3 is placed on the second receiving beam 23 in the mast lower end support portion 20, but the present invention is not limited to such a configuration. For example, a receiving base may be provided at the lower end 3 a of the mast 3 and the receiving base may be placed on the second receiving beam 23. In addition, the configuration of the mast lower end support portion 20 is not limited to the configuration in which the pair of second receiving beams 23 and 23 are placed on the pair of first receiving beams 22 and 22.

Moreover, the installation position (the floor height of a building) of the mast lower end support part 20 and the horizontal support part 30 is not limited to this Embodiment. In this embodiment, the gantry 44 is rearranged on the second floor by one-step climbing, but the present invention is not limited to this.
Although the climbing reaction force is received using the gantry 44 in the present embodiment, this is not the case when the arrangement span of the main beam 13 is large and does not interfere with the lifting device 4.

It is a side view which shows the structure of the tower crane by embodiment of this invention, Comprising: It is a figure of the state which installed the mast in the foundation floor. It is a figure which shows a mast lower end support part and a horizontal support part. It is an AA arrow directional view shown in FIG. FIG. 3 is a sectional view taken along line BB shown in FIG. 2. It is CC sectional view taken on the line shown in FIG. (A)-(c) is a side view explaining the process of floor climbing of a tower crane. (A), (b) is a side view explaining the process of floor climbing following FIG.6 (c).

Explanation of symbols

1 Tower crane 2 Cross base (base mount)
DESCRIPTION OF SYMBOLS 3 Mast 3a Lower end part 4 Lifting device 5 Pivot stand 6 Crane main body 7 Support structure 11 Floor concrete 12 Opening part 13 Main beam 20 Mast lower end support part 22 1st receiving beam (stand)
23 Second receiving beam (base)
30 Horizontal support 31 Jack 44 Frame

Claims (4)

A mast and a crane body which is movable up and down along the mast in a state where the upper part of the mast is inserted and supported, and the mast is disposed in an opening formed in floor concrete of each floor in the building. A tower crane support structure,
A mast lower end support portion provided at the opening with a receiving frame for receiving the lower end portion of the mast;
A horizontal support for horizontally supporting an intermediate portion of the mast by a jack interposed between the mast and the opening;
A tower crane supporting structure characterized by comprising: A mast lower end support part provided with an opening for mast insertion formed on the floor concrete of each floor of the building, a receiving stand for receiving the lower end part of the mast;
A horizontal support portion for supporting the middle portion of the mast in a horizontal direction with a jack capable of expanding and contracting a gap between the mast and the opening portion in the opening portion;
A crane body that is movable up and down along the mast with the upper part of the mast inserted and supported;
A climbing method of a tower crane that climbs with
In the mast lower end support part, releasing the mounting state of the lower end part of the mast and raising the mast;
Installing the receiving frame in the opening, and placing the raised lower end of the mast on the receiving frame to form the mast lower end support;
Providing the horizontal support portion for supporting the middle portion of the mast;
A step of raising the crane body to the upper portion of the mast along the raised mast after providing the mast lower end support portion and the horizontal support portion;
And climbing by repeating these steps in sequence.   The crane body is provided with a gantry equipped with an elevating device. When climbing, the gantry is placed and fixed on a main beam of a predetermined floor height, and the mast is raised by taking a reaction force on the gantry. The tower crane climbing method according to claim 2, wherein the tower crane is climbed. At a predetermined height from the basement floor of the building, a base frame is provided on the basement floor, the mast is erected on the base frame, and the mast is raised to a predetermined height,
4. The climbing method for a tower crane according to claim 2, wherein the base frame is detached from the mast after the ascent and the mounting state of the lower end portion of the mast is released.

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