KR101933635B1 - Reinforcing method and reinforcing structure of Waling - Google Patents

Abstract

The present invention relates to a method of reinforcing a band and a structure for reinforcing a band, comprising a first flange, a second flange spaced apart from the first flange, and a web connecting the first flange and the second flange A step of preparing a welt, a step of preparing a square tube comprising an upper surface, both side surfaces connected to both sides of the upper surface, a lower surface connected to the both side surfaces, and an empty space formed inside by the upper surface, both side surfaces and lower surface, Wherein each tube is inserted between the first flange and the second flange such that the end faces of the top face, both side faces, and bottom face are brought into contact with the first flange and the second flange, It is possible to easily and quickly construct the steel pipe by using only the spot welding instead of the steel pipe which is commonly used in the steel pipe, And a reinforcement structure of a belt, wherein the strength of the belt is greatly increased.
Also, in order to prevent the deformation of the strap when applying a preload tensile load in order to suppress the horizontal displacement of the retaining wall sufficiently or to increase the earth pressure, a reinforcing steel plate is installed on the inner surface between the first flange and the second flange to increase the stiffness The present invention relates to a reinforcement method of a belt and a reinforcing structure of a belt.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcement method for a belt,

The present invention relates to a reinforcement method of a belt and a reinforcing structure of a belt, and more particularly, to a belt reinforcement structure using a steel pipe having a much greater stiffness than that of a steel plate used for welding, To a reinforcing method of a belt zone reinforcing the rigidity of the belt zone and to a reinforcing structure of the belt zone.

The method of supporting the earth retaining wall 10 for the stability of the earth retaining wall 10 during the excavation of the ground can be divided into the following two types.

First, there is a method of installing a bracket 20 for each excavation step and supporting a retaining wall 10 by applying a load to the jack 40. Second, an earth anchor is installed for each excavation step and is pulled to form the earth retaining wall 10 There is a method to support.

In both of the above-mentioned supporting methods, a wale 50 is installed on the earth retaining wall 10 for each excavation step in order to maintain the stability of the earth retaining wall 10, and then a brace 20 or an earth anchor is provided on the front of the wale 50 Thereby supporting the earth retaining wall body 10.

On the other hand, the wale band 50 is a very important structure that distributes the earth pressure acting on the back surface of the earth retaining wall 10 and the axial force of the brace 20 and the earth anchor evenly.

The maximum member force (moment and shearing force) in the wale 50 is generated at a position where the brace 20 and the earth anchor are installed. When the brace 20 and the earth anchor are installed, The flange inner surface of the wale band 50 is reinforced by the steel plate 30 to increase the rigidity of the wale band 50 in order to prevent the wale band 50 from being deformed in excess.

The steel plate 30 is connected to both inner flange inner surfaces of the wale band 50 at both ends and is provided so as to correspond to both ends of a brace 20 provided in the wale band 50. Both end surfaces are connected to the flange inner surface of the wale band 50 After being installed to be vertical, weld (W) the face abutting the flange and fix it.

On the other hand, in the case of using the pre-cast steel having fine deformation as the wale band 50, the iron plate 30 manufactured at the factory may be slightly spaced from the first and second flange inner surfaces of the wale band 50. In addition, the permissible stress of H-section steel for wale (50) is reduced in proportion to the degree of deformation of secondary steels. Accordingly, in the prior art, the first and second flange inner surfaces of the wale band 50 and the lower side of the wale 50 are fabricated to the same standard in the factory, (W) were welded to both sides of the brace or Earth Anchor.

The reinforcing steel plate 30 of the wristwatch 50 uses a steel plate 30 having a thickness of 14 mm which is usually manufactured by a factory. The installation position of the steel plate 30 is inside the wristband 50 where both ends of the braces 20 are installed in the wristband 50. The installation positions are two on the inner surfaces of the first and second flanges of the band, And four welds (W) per steel plate (30). Therefore, it is necessary to weld four steel plates (30) per one of the braces (20) to weld a total of 16 welds.

When the steel plate 30 is manufactured to be finely large in consideration of the distance between the first and second flanges of the wale 50, it is preferable to apply a blow with a hammer or the like so as to be fitted between the first and second flanges of the wale 50 When the steel plate 30 is not installed perpendicularly to the first and second flanges of the wale 50 because the contact area between the steel plate 30 and the flange of the wale 50 is small, When eccentricity is generated and the steel plate 30 is separated from the wristband 50, the reinforcing effect is lost. Therefore, when the stress generated by the external force exceeds the allowable stress of the wristband 50, the first and second flanges and the web of the wristband 50 may be deformed and shear fractured. In order to prevent the thus-sandwiching of the iron plate 30, both the inner surfaces of the first and second flanges and the iron plate 30 are welded and fixed.

When the steel plate 30 is used as a reinforcing member of the wale 50, the steel plate 30 is welded to the portion of the wale 50 that is in contact with the flange inner surface while the operator holds the steel plate 30 by hand.

On the other hand, although some methods of reinforcing the wale band 50 using members other than the steel plate 30 are proposed as described below as a patented technique, the cost of the material is high and the construction method is more complicated than the method of welding the steel plate 30 Therefore, it is rarely seen that it is actually used. In the field, a method of reinforcing with steel plate 30 is mainly used.

As another method of reinforcing a belt, Korean Patent Publication No. 10-2015-0104063 (hereinafter referred to as "Patent Document 1") discloses a method of preventing buckling and deformation of an H-shaped beam using a T- Is described.

The T-type reinforcement device of Patent Document 1 includes a reinforcing main body and a wedge. The reinforcing main body includes a support shaft disposed in parallel with the web of the H-shaped steel, and a wedge which is installed in close contact with the side surface of the web and prevents the position of the support shaft from changing. The reinforcing main body may further include a plate for preventing the support shaft from moving in the longitudinal direction when the wedge is stuck.

Specifically, the support shaft is disposed in parallel with the web between the first and second flanges of the H-shaped steel. At this time, one end surface of the support shaft is in close contact with the inner surface of the second flange.

In this method, a worker firstly brings the end surface of the outer free end of the pedestal into close contact with the side surface of the web, and one end surface of the support shaft is brought into close contact with the second flange so that the support shaft is sandwiched between the first and second flanges . In this state, there is a gap between the other end surface of the support shaft made of the downwardly inclined surface and the first flange. When the wedge is inserted into the gap between the downwardly inclined end surface of the other end of the support shaft and the first flange, And the second flange.

In the conventional technique such as Patent Document 1, the T-shaped reinforcement device and the wedge must be separately manufactured. After the operator attaches the reinforcing main body to the H-shaped steel, the wedge is inserted while holding the reinforcing main body, Reinforcement The work must be done between the main body and the H-beam. Also, the reinforcing device is composed of a reinforcing body, a wedge, a plate, and a binding wire connecting the wedge and the reinforcing main body, thereby complicating fabrication and increasing the cost.

Korean Patent No. 10-0259394 (hereinafter referred to as "Patent Document 2") discloses a technique relating to a method of reinforcing a retaining wall band using a threaded band reinforcing apparatus.

The reinforcing device of Patent Document 2 is composed of one water body and two arm bodies.

The female body is hollow cylinder type, and the internal threads are formed inside the left and right threads respectively. Both ends of the water body are formed with male threads with left and right threads, respectively, and holes for fastening tools are drilled in the center at regular intervals.

The male thread of the waterbody is formed to be engaged with the female thread formed on the female body. Therefore, the diameter of the water body is smaller than the diameter of the rock body. Since the hole formed in the central portion of the water body is provided so as to facilitate rotation of the water body for fixing the screw type reinforcing device of the present invention, if the additional fastening mechanism is inserted into the hole and rotated, the entire length of the water body and the arm body is increased It is installed or disassembled in the wrist strap.

However, in the conventional technique such as Patent Document 2, the clamping mechanism for adjusting the length of the screw type reinforcing apparatus must be separately provided by separately fabricating the arm body and the water body, and in order to adjust the length, The fastening mechanism should be installed according to the position of the hole and rotated several times. Therefore, although the welding is eliminated, the cost of manufacturing the reinforcing device is high, and it is inconvenient to use the reinforcing body in the field because it is necessary to install and disassemble it by a fastening mechanism.

Korean Patent Registration No. 20-0313194 (hereinafter referred to as Patent Document 3) discloses a technique relating to a member for reinforcing a wale.

In the wale band reinforcing member according to Patent Document 3, there is provided a wale band reinforcing member according to Patent Document 3, which is composed of an H-shaped steel which is installed to support a toe wall so as not to collapse the backside gravel upon excavation in a temporary earth retaining work, , The member is composed of a pipe filled with concrete in the interior thereof and a cap which can be attached to the first and second flanges of the band zone at one end or both ends of the pipe.

The wale band reinforcing member is cured by pouring concrete in the pipe and then covering the cap on both sides of the pipe to complete the reinforcing member, and then the reinforcing member is installed on the wale flange.

However, in the conventional technology such as Patent Document 3, since a pipe is separately provided and concrete is placed in the pipe, the manufacturing process is complicated, so that it takes a lot of time and cost, the concrete must be cured, The concrete inside the pipe in which the concrete is cured can easily be broken, and the concrete is filled in order to be used again.

Korean Patent No. 10-1284514 (hereinafter referred to as "Patent Document 4") discloses a technique relating to "Stiffener for preventing flange buckling of H-section steel".

The stiffener of Patent Document 4 is composed of a supported steel pipe and a steel pipe supporting clip which is connected to both ends of the supported steel pipe and enables the stiffener to be attached and detached from the H-shaped steel.

The supported steel pipe is located between the flanges facing each other of the H-shaped steel and is installed to resist the axial force of the braces. The support pipe of the circular tube has a hollow shape penetrating in the longitudinal direction inside thereof, and the steel pipe supporting clip removes and attaches the supported steel pipe to the H-shaped steel pipe.

However, in the conventional technique such as Patent Document 4, when the stiffener is broken on the H-shaped steel, the supporting steel tube and the supporting clip can not be used when they are separated, and the supporting clips on both sides must be fitted to the flange of the H- do. In addition, since the length can not be adjusted to the length of the H-shaped steel, there is a problem that it must be re-manufactured every time the standard is changed.

Although the above-described four technologies (Patent Documents 1 to 4) should have been applied to all sites if the usability was good, it is considered that practicality is low considering that steel plate reinforcement is used in actual sites.

Korea Publication No. 10-2015-0104063 Korea Patent No. 10-0259394 Korean Registration Practice No. 20-0313194 Korean Patent No. 10-1284514

The present invention solves the above-described problems, that is, a problem caused by the conventional method of manufacturing and installing a wale band reinforcing device, and in order to increase rigidity of a band by a simple installation method, Which can easily and quickly reinforce the stiffness of the strip by simply striking the staple or by spot welding, and to provide a reinforcing structure of the strip.

It is also an object of the present invention to provide a reinforcing method of a belt and a reinforcing structure of a belt for more reliably inserting or fixing each tube into a wale.

It is another object of the present invention to provide a method of reinforcing a band zone and a reinforcing structure of a band zone by providing respective tubes between flanges of the band zone to increase the rigidity of the band zone.

In order to accomplish the above object, the present invention provides a stiffening structure for a stiffened belt and a belt-shaped stiffening structure including a first flange, a second flange spaced apart from the first flange by a predetermined distance, and a second flange Comprising: providing a welt comprising a web to be worn; Preparing a plurality of tubes each including a top surface, both side surfaces connected to both sides of the top surface, a bottom surface connected to the both side surfaces, and an empty space inside the top surface, both side surfaces and the bottom surface; And inserting each of the tubes into a space between the first flange and the second flange so that the end faces of the upper face, the side face, and the lower face are brought into contact with the first flange and the second flange, respectively.

And performing spot welding on each of the tubes so that the positions of the tubes are not changed after the tubes are erected.

A first flange connected to the earth retaining wall; A second flange to which a brace is connected, the second flange being spaced apart from the first flange; A web connecting said first flange and said second flange; And an empty space formed between the first flange and the second flange and formed by the top surface, both side surfaces connected to both sides of the top surface, the bottom surface connected to the both side surfaces, and the top surface, Wherein each of the tubes has an upper surface, an opposite end surface, and an end surface of the lower surfaces contacted with the first flange or the second flange.

Further, in order to further increase the stiffness of the belt zone in the case where the earth pressure is large or the shear preload is large, the reinforcing steel plate provided between the respective pipes and the first flange or between the pipes and the second flange .

The reinforcing method of the band zone and the reinforcing structure of the band zone of the present invention have the following effects.

In the present invention, when a wristband of a new material is used, each tube is cut finer than the wale flange interval and inserted into each tube, or a hammer or the like is used to push it in between the first and second flanges of the band shaft so that each tube is in contact with the inner surface of the wale flange Because of the large area, it is possible to install without shaking easily without welding.

In addition, according to the present invention, it is possible to easily fix each tube to the wale by performing spot welding only at a few places within the range where the installation position of each tube, that is, the position of each tube installed at the position where the brace is installed, , The construction speed is very fast.

In addition, since the present invention uses a tube having a much larger cross-sectional area, the rigidity of the strip can be significantly increased compared to the steel plate.

Also, even if there is a minute gap between each pipe and the flange of the wale, the present invention is characterized in that as the earth excavation progresses according to the excavation step, the earth pressure increases due to the earth pressure or the preceding load applied to the brace, 1,2 The fine gap between the flange and each tube is completely tight, so it never comes off.

Further, since the contact area between each tube and the inner surfaces of the first and second flanges is much wider than that of the steel plate, the present invention is free from the fear that the tubes are separated from the wale by the eccentricity due to the axial force of the braces, And the sectional area of each pipe is wider than the cross-sectional area of the steel plate, so that the allowable shear force of the band is greatly increased, so that the structural stability of the band is greatly increased.

In addition, each pipe used in the present invention can be purchased by purchasing an off-the-shelf product and cutting it at the site, so that the workability is precise and the construction cost and the construction period are reduced. It can be seen that there is almost no welding length and welding amount compared to welding by iron plate because it can be inserted by hitting with a hammer or the like or welding at only a few points. Therefore, each tube used in the present invention is much more advantageous than steel plate in terms of stability, economy, and workability.

Further, the present invention does not need to deliberately dismantle each tube when dismantling the wrist band, and can be used at the next construction site in the state where each tube is installed. That is, according to the present invention, even if the installation position of the brace is not matched with the existing position, the stiffness of the brace is increased as each tube is reinforced, so that the resistance against the external force increases. However, since each tube is not a disposable tube, it is much more economical to disassemble it and use it several times. Since it is stuck or inserted only by spot welding, it can be removed by striking if it is struck. In case of spot welding, only spot welding part should be blown off with oxygen. For reference, steel plate is disposable and treated with scrap iron because it can not be reused by cutting the welding part with oxygen.

Further, in order to further increase the stiffness of the belt zone when the earth pressure is increased or the pre-load is increased largely, the stiffness of the belt zone can be further increased by installing the reinforcing steel plate on the inner surface of the wale flange first, have.

In addition, the present invention can be applied to the reinforced steel plate attached to the inner surface of the wale flange by spot welding, so that it can be used many times if only the spot welding portion is blown with oxygen at the time of disassembly.

Figs. 1A to 1E show a prior art in which an iron plate is used as a stiffener of a belt.
Figs. 2A to 2F show a wale made through the first embodiment of the present invention. Fig.
Fig. 3 is a perspective view of a square tube applied to this embodiment. Fig.
Figs. 4A and 4B show a wale made through the second embodiment of the present invention. Fig.
Figs. 5 and 6 are flowcharts of a method of reinforcing a band zone to which a middle steel according to the first embodiment is applied. Fig.
Fig. 7 is a flow chart for creating a wale structure according to a second embodiment; Fig.

The same components as those of the conventional art will be described below with reference to the related art, and a detailed description thereof will be omitted.

In Korea, it is a common construction method to install a reinforcing steel plate between the 1st and 2nd flanges of the belt to prevent shear failure at the position where the brace or earth anchor is installed, that is, the position where the maximum shearing force is maximum . However, there is no example in which the rigidity of the wale band 100 is increased by simple and easy construction using the pipes 200 and 200b as reinforcing materials as in the present invention.

The reinforcing structure of the wale band 100 of the present invention is constructed such that first flanges 122 and 122b connected to the earth retaining wall 10 and a brace 20 are connected to each other and a first flange 122b and the webs 110, 110b connecting the first flanges 122, 122b and the second flanges 124, 124b, the first flanges 122, 122b and the second flanges 124, And two side surfaces 222, 222b, 224 and 224b connected to both sides of the upper surfaces 210 and 210b and lower surfaces 230 and 230b connected to both side surfaces 222, 222b, 224 and 224b, which are provided between the flanges 124 and 124b. 200b including the upper and lower surfaces 210 and 210b, the side surfaces 222, 222b, 224, and 224b, and the lower surfaces 230 and 230b formed in the inner space 240 and 240b, respectively . The wristband 100 is formed with a stiffener mounting portion 130 surrounded by the first flanges 122 and 122b, the second flanges 124 and 124b, and the webs 110 and 110b and having open upper and lower sides.

 The cross section of each of the tubes 200 and 200b is a square or a rectangle. When a generally used waleband 100 of H-300x300 is used, both the square pipes 200 and 200b may be square or rectangular having a height of 150 mm or less. In accordance with the standard of the H-shaped steel pipe for the wale band 100, b) can be determined. Therefore, the lengths of both ends of the upper surfaces 210 and 210b, the side surfaces 222, 222b, 224 and 224b and the lower surfaces 230 and 230b of the tubes 200 and 200b may be equal to each other or longer.

The front and rear sides of the hollow pipes 200 and 200b pass through the front and rear sides and the front and rear sides of the empty spaces 240 and 240b formed by the upper surfaces 210 and 210b, the side surfaces 222, 222b, 224 and 224b and the lower surfaces 230 and 230b, b).

2A is a plan view of a wristband 100 and a brace 20 provided with a square tube 200 according to the first embodiment. FIG. 2B is a plan view of a wristband 100 and a brace 20 made of a new material in the first embodiment, 2C is a front view of the wristband 100 and the braces 20 of the middle steel of the first embodiment as seen from the rear side. Fig. 2D is a partially enlarged view of Fig. 2A. Fig. 2E is a front view 3 is a perspective view of each tube 200. Fig. 4A is a perspective view of the wristband 200 in which the tube 200 is inserted into the wristband 100. Fig. 4A is a front view of the wale band 100 according to the first embodiment of the present invention, and FIG. 5B is a front view of the wale band 100 with the reinforcing steel plate 400 interposed between the first and second flanges 120b. FIG. 6 is a flow chart of a method of reinforcing the wristband 100 to which the middle steel according to the first embodiment is applied, and FIG. 7 is a flowchart of a method of reinforcing the wristband 100 of the second embodiment. A flow to create a structure.

==================== Example 1 ====================

Hereinafter, a first embodiment of the reinforcing method of the wale band 100 will be described based on Figs. 2A to 3, 5, and 6. Fig.

The reinforcing method of the wale band 100 of the first embodiment includes a first flange 122 and a second flange 124 spaced apart from the first flange 122 by a predetermined distance and a first flange 122 and a second flange 124 A step 110 of preparing a wristband 100 including a web 110 connecting the upper surface 210 and the upper surface 210 of the upper surface 210 of the upper surface 210; A step S220 of preparing a square pipe 200 including a bottom surface 230 and an empty space 240 formed in the interior by the top surface 210, the side surfaces 222 and 224 and the bottom surface 230, Are inserted between the first flange 122 and the second flange 124 so that the end faces of the top face 210, the side faces 222 and 224 and the bottom face 230 are connected to the first flange 122, the second flange 124, (S130) in which each tube (200) is raised.

All the front and rear end surfaces of the tubes 200 are brought into contact with the first flange 122 or the second flange 124 in step S130 in which the tubes 200 are installed. That is, if the tube 200 is inserted into the wristband 100 with a hammer or the like, the entire tube 200 is inserted into the stiffener mounting portion 130 of the wristband 100 and is kept standing. Therefore, when each tube 200 is inserted into the wale 100, each tube 200 is completely inserted between the first and second flanges 120 of the wale 100 and installed in the wale 100. Thus, the construction is easy and quick, 200 are larger than the cross-sectional area of the steel plate, the rigidity of the wale band 100 is sufficiently reinforced.

In this embodiment, when a new product of a new product that has not been used is used as the wale 100, the finished product 200 of the wale 100 is aligned with the straight distance between the first and second flanges 120 The flange 120 is inserted into the first flange 120 of the wale band 100 and is fixed to the wale band 100 so that the rigidity of the wale band 100 . Therefore, in the present embodiment, it is not necessary to separately weld the reinforcing members or welding the sections where the inner surfaces of the first and second flanges 120 of the wale 100 are in contact with each other.

On the other hand, when the pre-cast steel having fine deformation is used as the wale band 100, the iron plate manufactured at the factory as before can be slightly spaced from the inner surface of the first and second flanges 120 of the wale band 100. Also, the allowable stress of the wale band 100 using the secondary steel is reduced in proportion to the degree of deformation of the secondary steel.

The existing technique is to install steel plate (stiffener) manufactured by the factory at the same size on the upper and lower surfaces between the 1st and 2nd flanges of the belt, when the band is new steel or high-grade steel, slightly smaller than the straight line length between the 1st and 2nd flanges. , And both sections of the steel plate contacting with the first and second flanges are welded to provide rigidity Respectively.

However, in the present technique using the tube 200, when a secondary steel material having a deformation in the flange 120 of the wale 100 is used, The straight line distance between the first flange 120 and the second flange 120 of the wristband 100 at the position where the tube 200 is to be reinforced in the field is set to be (S220), and completely inserted into the stiffener mounting portion 130, which is a space between the first and second flanges 120 of the wristband 100 (S230), so that the position is not changed The stiffness of the wristband 100 can be sufficiently increased even if only spot welding (SW) is performed in several places (S240). That is, the present embodiment further includes a step S240 of performing spot welding (SW) on each pipe 200 so that the position of each pipe 200 is not changed after each pipe 200 is set up when the wale band 100 is used steel . In other words, as shown in FIG. 2C, it is preferable that spot welding (SW) is performed in two places, one on each of the both side surfaces 222 and 224 of each tube 200, so that each tube 200 is fixed to the wale 100. Therefore, even if each tube 200 is slightly inclined like a conventional steel plate in the wrist strap 100, the contact area of each tube 200 with the first and second flanges 120 is much wider than that of the steel plate, There is no fear that the tubes 200 will separate.

The reinforcing method of the wale band 100 of the first embodiment described above is characterized in that the straight length between the first flange 122 and the second flange 124 of the wale band 100 provided on the earth retaining wall 10 is directly The cut pipe 200 is cut in accordance with the length between the first flange 122 and the second flange 124 regardless of the standard of the wale band 100 Is completely inserted into the stiffener mounting portion 130 which is the internal space of the first and second flanges 120 (S130). At this time, the wale band 100 is formed such that the straight length between the first and second flanges 120 and the web 110, which is the connecting portion between the first flange 120 and the web 110, is shortened toward the corner side, The lower surface 230 or the upper surface 210 of the wristband 200 is spaced apart from the web 110 of the wristband 100 by a predetermined distance. In the present embodiment, the corners are formed in oblique lines, that is, inclined surfaces. The top surface 210 or the bottom surface 230 of each tube 200 is spaced apart from the top or bottom of the first and second flanges 120 by a predetermined distance. Also, when the tubes 200 are installed on the upper and lower sides of the web 110, the upper tube 200 and the lower tube 200 are spaced apart from each other by a predetermined distance. In other words, it may be provided on the inner surface of the flange 120 in the upper and lower surfaces.

The height, that is, the length of each tube 200 is shorter than the length from the top of the first and second flanges 120 to the web 110. That is, the vertical length of each tube 200 is shorter than half of the vertical length of the wristband 100.

Each of the tubes 200 is installed at a position corresponding to both sides of the braces 20 installed on the first flange 122 of the wristband 100. In each tube 200, two upper and lower portions are provided between the first and second flanges 120 with respect to the web 110, and a total of four tubes are provided per one brace 20. More specifically, both ends of the flange 24 of the brace 20 are positioned between the opposite side surfaces 222, 224 of the tube 200, and both ends of the flange 24 of the brace 20 are spaced apart from the outer surface 224 of the tube 200 And closer to the inner side 222. The inner side surface 222 of each tube 200 refers to a side surface of each tube 200 of the two tubes 200 installed at both ends of the brace 20.

Between the two pipes 200, a bolt B connecting the braces 20 and the first flange 122 is provided in the vicinity of the inner surface 222 of each pipe 200, Two on the upper and lower sides, respectively. In other words, four bolts (B) are installed per one pair of braces (20).

The bolt B is positioned closer to the inner side 222 of the tube 200 than to the web 22 of the brace 20. More specifically, the bolt B on the upper side is positioned at the center of the web 110 of the wristband 100 and the upper end of the first and second flanges 120 while the lower bolt B is positioned at the center of the web 110 of the wale 100 And is located at the center of the lower end of the first and second flanges 120. That is, the bolt B is positioned at the center between the four corners 200 installed per one of the braces 20.

As described above, when the stiffener is used to increase the rigidity of the wale band 100 regardless of the standard of the steel used for the wale band 100, the present technique can be performed only with few welding or spot welding (SW) It is possible to easily increase the rigidity of the hinge 100 and reduce the construction cost and construction time.

Second Embodiment ==================

On the other hand, when the excavation depth is deep or the back ground is weak soil or the groundwater level is much higher than the excavation depth, the earth pressure acting on the earth retaining wall 10 is greatly increased and the axial force of the bracket 20 is also proportionally increased . Further, when a large leading load is applied to the brace 20 to sufficiently suppress the horizontal displacement of the retaining wall 10, the shear force increases at the position where the brace 100 and the brace 20 are connected, Lt; / RTI >

Hereinafter, a reinforcement structure of the wristband 100 of the second embodiment which can be applied to such a situation will be described with reference to Figs. 3, 4A, 4B and 7.

The reinforcing structure of the wale band 100 according to the present embodiment includes a first flange 122b connected to the earth retaining wall 10 and a second flange 122 connected to the brace 20 and spaced apart from the first flange 122b A web 110b that connects the first flange 122b and the second flange 124b and a second flange 124b that is provided between the first flange 122b and the second flange 124b and includes an upper surface 210b, And a bottom surface 230b connected to both side surfaces 222b and 224b and an upper surface 210b and both side surfaces 222b and 224b and a bottom surface 230b And a hollow space 200b including an empty space 240b.

Each tube 200b is characterized in that the end surfaces of the upper surface 210b, the both side surfaces 222b and 224b and the lower surface 230b are in contact with the first flange 122b or the second flange 124b.

The present embodiment further includes a reinforcing steel plate 400 installed between at least one of the tubes 200b and the first flanges 122b or between the tubes 200b and the second flanges 124b.

The reinforcing steel plate 400 is first installed on the inner and lower sides of the first and second flanges 120b of the wale band 100 to increase the rigidity of the position where the braces 20 are connected to the wale band 100, If the rigidity of the wale band 100 is further increased by providing a rectangular pipe 200b perpendicularly to the reinforcing steel plate 400, the deformation of the wale band 100 with respect to a large load (earth pressure or strut leading load) .

The reinforcing steel plate 400 is welded to the first and second flanges 120b of the wale band 100 by spot welding at about two points without welding them and then installing the respective pipes 200b, The wristband 100 is elastically compressed and adhered thereto, so that the position of the reinforcing steel plate 400 is fixed without being moved.

The reinforcing steel plate 400 is a rectangular parallelepiped having a vertical length equal to or slightly larger than the vertical length of each pipe 200b and a length at both ends being about twice the length of both ends of the brace 20. The reinforcing steel plate 400 is inserted between the rectangular pipe 200b and the first flange 122b on both sides and between the pipe 200b and the second flange 124b on both sides to reinforce the wale band 100. [ At this time, four corners 200b and four reinforcing steel plates 400 are installed per one of the braces 20.

The reinforcement structure of the wale band 100 according to the second embodiment described above prepares the wale band 100 (S410), and as a countermeasure for increasing the rigidity of the position where the brace band 20 is connected to the wale band 100, The reinforcing steel plate 400 is first installed on the inner surfaces of the first and second flanges 120b of the retaining wall 100 in step S405 and the straight line between the reinforcing steel plates 400 on both sides of the wale 100 installed in the retaining wall 10 The length of each pipe 200b is cut off to a finer length than the straight length between the reinforcing steel plates 400 at step S420 and the cut steel pipe 200b is cut into the reinforcing steel plate 400 The front and rear ends of each tube 200b are inserted into the stiffener mounting portion 130 of the wale band 100 from the upper surface 210b or the upper surface 210b so as to be perpendicular to the first and second flanges 120b, (S430), the reinforcement of the wristband 100 is completed. At this time, since the corners of the wristband 100, which are the connecting portions of the first and second flanges 120b and the web 110b, are formed diagonally, the lower surface or the upper surface of the reinforcing steel plate 400, (110b). The upper and lower ends of the first and second flanges 120b are aligned with the upper and lower surfaces of the reinforcing steel plate 400 and the upper and lower surfaces 210b and 230b of the tube 200b. At this time, the upper and lower surfaces of the reinforcing steel plate 400 are aligned with the upper surface 210b and the lower surface 230b of each tube 200b.

The web 110b of the wale 100 is positioned at the center of the upper and lower tubes 200b and the reinforcing plate 400. [ Also, as shown in FIG. 4B, both ends of the reinforcing steel plate 400 are positioned on the outer sides of the respective pipes 200b on both sides.

When the tubes 200b and the reinforcing plate 400 are installed on the upper and lower sides of the web 110b, the upper tube 200b and the reinforcing plate 400, the lower tube 200b, Be spaced at regular intervals

The reinforcing steel plate 400 is installed between each tube 200b and the first and second flanges 120b to prevent deformation of the wale band 100 with respect to a large load as the rigidity is increased. Also, the reinforcing steel plate 400 may be manufactured by performing spot welding (SW) at several points without welding the entire portion of the wristband 100 that is in contact with the inner surfaces of the first and second flanges 120b and then installing the respective pipes 200b therebetween The stiffness of the wale band 100 is increased and the wale band 100 is elastically compressed and tightly contacted with the wale band 100 due to the earth pressure or the preceding load of the brace 20. Therefore, even if there is a small gap, the position is fixed without being moved.

Further, each of the tubes 200b after the reinforcement plate 400 is installed may be spot welded if the reinforcement plate 400 and the tubes 200b are minutely separated as in the first embodiment.

Other configurations and effects are the same as those of the first embodiment.

Structural stability of the present invention ==============

When the steel plate 100 and the steel pipe 200 are compared with each other as a wale 100 steel reinforcement, the steel pipe 200 has a much larger allowable shear force than the steel plate. Therefore, when the square pipe 200 is installed on the inner and lower sides of the first and second flanges 120 of the wale band 100, the shear area and stiffness of the wale band 100 increase do. Hereinafter, the allowable shear stress of the wale band 100 to which the present invention is applied and the wale band 100 to which an iron plate is applied will be described.

이다.[Table 1] shows the allowable stresses of the steel. The unit is

to be.

로 검토할 수 있다. 여기서 S는 띠장(100)에 작용하는 전단력이고, A는 H형강 웨브(110)의 단면적, 즉 전단력과 일직선 상에 놓여 있는 강재의 단면적이다. 따라서 흙막이는 영구구조물이 아니고 가시설 구조물이이므로 영구응력 x 1.5를 사용한다. 여기서 허용전단응력은 1.5배인

=800 x 1.5 = 1200

을 적용한다. The H-section steel for the wale 100 generally uses H-300x300x10x15 size, and the shear stress of the wale 100 is

. Where S is the shear force acting on the wristband 100 and A is the cross-sectional area of the H-shaped web 110, i.e., the cross-sectional area of the steel lying straight on the shear force. Therefore, because the retaining structure is not a permanent structure but a hermetic structure, a permanent stress x 1.5 is used. Here, the allowable shear stress is 1.5 times

= 800 x 1.5 = 1200

Is applied.

The maximum permissible shear force is calculated for the case where the steel plate is not reinforced in the wale band 100 and the case where it is reinforced by backing the allowable shear stress formula based on [Table 1].

The standard of the used wale band 100 is H-300x300x10x15.

이고, 1200

= S/30

이므로, 1200 x 30 = 36000 kg가 되어 허용전단력은 S=36.0ton이 된다. 반면 기존기술인 14mm(두께) x 140mm(길이)의 철판을 사용한 경우는 단면적 A = (30.0cm x 1.0cm)+((1.4cm x 30cm) x 2개) = 114.0

이고, 1200

= S/114

이므로, 1200 x 114 = 136800 kg 가 되어 허용전단력은 S=136.8ton이 된다.First, when there is no steel plate reinforcement in the wristband 100, the cross-sectional area A = 30.0 cm x 1.0 cm = 30

, 1200

= S / 30

Therefore, 1200 x 30 = 36000 kg and the allowable shear force becomes S = 36.0 ton. On the other hand, in the case of using a conventional steel plate of 14 mm (thickness) x 140 mm (length), the cross sectional area A = (30.0 cm x 1.0 cm) + ((1.4 cm x 30 cm) x 2) = 114.0

, 1200

= S / 114

Therefore, 1200 x 114 = 136800 kg and the allowable shear force becomes S = 136.8ton.

이고, 1200

= S/30

이므로, 1200 x 30 = 36000 kg가 되어 허용전단력은 S=36.0ton이 된다. 반면 띠장(100)을 각관(200)으로 보강한 경우는 단면적 A = (30.0cm x 1.0cm)+(1.25cm x 30cm) x 4개 = 180.0

이고, 1200

= S/180

이므로, 1200 x 180 = 216000 kg가 되어 허용전단력은 S=216.0ton이 된다.Secondly, when a square tube 200 having a size of 125 mm (width) x 125 mm (length) x 5 mm (thickness) as in the present invention is used, the sectional area A = 30.0 cm x 1.0 cm = 30

, 1200

= S / 30

Therefore, 1200 x 30 = 36000 kg and the allowable shear force becomes S = 36.0 ton. On the other hand, when the wale band 100 is reinforced by the tube 200, the sectional area A = (30.0 cm x 1.0 cm) + (1.25 cm x 30 cm) x 4 = 180.0

, 1200

= S / 180

Therefore, 1200 x 180 = 216000 kg, and the allowable shearing force becomes S = 216.0 ton.

With this calculation, the allowable shear force of the wale band 100 is increased by 1.58 times when reinforced by the corrugated pipe 200 than when it is reinforced with the steel plate. Therefore, it can be seen that the reinforcement of each pipe 200 becomes much more structurally advantageous than the reinforcement of the steel plate.

Hereinafter, the rigidity of the wale band 100 to which the present invention is applied and the wale band 100 to which an iron plate is applied will be described.

이며, 철판과 각관(200)은 탄성계수가 서로 동일하기 때문에 이차모멘트

를 비교하였다. 버팀대(20)는 띠장(100)의 전면에 설치되므로 철판과 각관(200)은 띠장(100)의 제1,2플랜지(120) 내면을 기준으로 이차모멘트를 산정하였다. 실제로 철판과 각관(200)은 띠장(100) 상,하부에 각각 두 개씩 총 네 개가 설치되지만, 본 설명에서는 간단히 강성 증가를 비교하기 위해서 기존기술에 사용되는 철판 한 개를 설치한 경우와 본 발명에 사용되는 각관(200) 한 개를 설치한 경우의 이차모멘트를 계산하여 비교하였다.The equation of stiffness is

Since the steel plate and the tube 200 have the same elastic modulus, the secondary moment

Were compared. Since the brace 20 is installed on the front surface of the wristband 100, the steel plate and the tube 200 calculate the second moment based on the inner surfaces of the first and second flanges 120 of the wristband 100. In actuality, four steel plates and two steel pipes 200 are installed on the upper and lower portions of the wing 100, respectively. However, in the present embodiment, in order to compare the increase in rigidity simply, The second moments in the case where one of the tubes 200 used in the first embodiment are installed is calculated and compared.

=

이며, 여기서 b는 철판의 폭이고, h는 철판의 길이이므로,

=

=

=320

이고, 본 발명과 같이 125mm(가로) x 125mm(세로) x 5mm(두께)의 각관(200)을 사용하면

=553

이다. 이 값은 강재표를 참고한 것이다.If you use a steel plate of 14mm (thickness) x 140mm (length) like the conventional technique, the second moment

=

, Where b is the width of the steel plate and h is the length of the steel plate,

=

=

= 320

, And each tube 200 of 125 mm (width) x 125 mm (length) x 5 mm (thickness) as in the present invention is used

= 553

to be. This value refers to the steel sheet.

As a result of the calculation, when the rigidity of the steel plate and the tube 200 is compared, the secondary moment when the tube 200 is reinforced by the tube 200 is 1.73 times larger than the secondary moment when the steel plate is reinforced.

The second moments of the H-300x300x10x15 wale 100 without the steel plate or tube 200 are applied equally and are therefore excluded.

On the other hand, in the case where it is necessary to further increase the rigidity of the wale band 100, the method for reinforcing the wale band 100 of the second embodiment is such that the reinforcing steel plate 400 is placed on the inner surface of the first and second flanges 120b of the wale band 100 It is possible to easily increase the rigidity of the wale band 100 by installing the respective pipes 200b between the reinforcing steel plates 400 on the front and rear sides after point welding (SW) and then performing point welding (SW) at several points.

======================= Effect of the present invention =======================

Hereinafter, merits 200 and 200b for reinforcing a wale band 100 instead of an iron plate as in the present invention will be described.

First, when the contact area between the inner surface of the first and second flanges of the belt is small and the steel plate is not vertically installed on the inner surfaces of the first and second flanges of the belt, the steel plate is separated from the wale by eccentricity due to the axial force Welded between the inner surface of the first and second flanges of the belt and the section in contact with the steel plate. However, according to the present invention, when the wristband 100 of the new steel material is used, it can be installed simply by inserting the square tube 200 or by piercing it with a hammer or the like and pressing it between the first and second flanges 120 of the wale band 100 Do.

On the other hand, in the case of using the wale band 100 of the high-grade steel, since the distance between the first and second flanges 120 of the wale band 100 is measured in the field, It is possible to increase the precision of the construction and even if the minute tube 200 is separated from the wale band 100 due to a minute error, the sectional area of each tube 200 is much larger than that of the steel plate, It is easy to fix each tube 200 to the wale 100 by performing point welding (SW) only at a few places within a range where the position of each tube 200 is not changed without welding both sections contacting with the flange 120 The construction is very convenient and the construction speed is very fast.

Further, since the reinforcing position of each tube 200 is not changed from the wristband 100, the rigidity of the wristband 100 can be increased sufficiently.

The brace 20 and the wale band 100 are elastically compressed by the earth pressure which increases as the excavation of the brace 20 is performed by the excavation step or the preceding load which is applied to the brace 20, The minute spacing between the flange 120 and the cut tube 200 is reduced so that the first and second flanges 120 and the tube 200 are in close contact with each other so that the tube 200 does not completely fall out of the wale 100.

Third, the contact area between the inner surface of each tube 200 and the inner surfaces of the first and second flanges 120 is much larger than that of the conventional steel plate 14 mm. That is, since the width of contact with the first and second flanges 120 is as wide as 125 to 150 mm, even if the eccentricity due to axial force acts on the braces 20, there is no concern that the tubes 200 are separated from the wale 100, And the allowable shear force of the wale band 100 is greatly increased, so that the structural stability of the wale band 100 is greatly increased.

이고, 가로 12.5cm x 세로 12.5cm x 두께 0.5cm의 각관(200)을 사용했을 때, 각관(200)과 제1,2플랜지(120) 간에 접촉면적은 12.5cm x 0.5cm x 4 = 25.0

이다. 따라서 각관(200)과 띠장(100)간에 접촉면적은 철판과 띠장(100)간에 접촉면적의 약 1.3배 크다. 이는 단순히 면적만으로 비교한 것이지만 실제 각관(200)의 사각형을 전체 단면적으로 볼 수 있기 때문에 각관(200)의 접촉면적은 훨씬 더 넓어진다. Even if the angle of contact between the wristband 100 and the tube 200 is very wide and the tube 200 is provided at a slight inclination to the wristband 100, the wristband 20 is separated from the wristband 100 by eccentricity The rigidity of the wale band 100 can be sufficiently increased. For example, when using a steel plate of 27 cm x 14 cm x 1.4 cm thick, the contact area between the steel plate and the first and second flanges is 14 cm x 1.4 cm = 19.6

The contact area between each tube 200 and the first and second flanges 120 was 12.5 cm x 0.5 cm x 4 = 25.0 mm when using a square tube 200 of 12.5 cm x 12.5 cm x 0.5 cm thick

to be. Therefore, the contact area between each tube 200 and the wrist strap 100 is about 1.3 times larger than the contact area between the wrist strap 100 and the wrist strap 100. However, since the square of the actual pipe 200 can be seen in its entire cross-sectional area, the contact area of each pipe 200 is much wider.

Fourth, since each of the pipes 200 and 200b is manufactured by purchasing a ready-made product without using a factory-made standard product such as a steel plate, it is required to cut the product in the field so that the construction cost and the construction period are reduced. Since the distance between the first and second plates 120a and 120b is measured and applied, it is more advantageous in terms of economy and workability than the conventional steel plate in view of applicability.

Fifth, when the wale band 100 is dismantled after completion of the excavation, it is not necessary to dismantle the pipes 200 and 200b, and it can be used as it is installed at the next construction site. That is, if the installation position of the brace 20 is matched with the existing installation position, the tubes 200 and 200b can be used without being newly installed. Even if the installation position of the brace 20 does not match the existing position, The resistance of the wale band 100 to external forces such as the earth pressure and the preceding load of the brace 20 increases. However, since each of the tubes 200 and 200b is not disposable, it is more advantageous to disassemble it, so that it can be dismantled and disassembled when it is forced by a hammer or the like. In the case of only spot welding (SW) If only the part is blown with oxygen, it can be easily disassembled, so it can be used several times, which is much more economical than a single use iron plate.

Sixth, if the reinforcing steel plate 400 is installed on the inner surface and the bottom of the first and second flanges 120b of the wale band 100, the rigidity of the wale band 100 is further increased, and the earth pressure is increased or a large preceding load The deformation of the wale band 100 is further reduced, which is stable. If the reinforcing steel plate 400 is not used, it is necessary to increase the size of the wale band 100 to maintain the stability, which increases the construction cost and becomes uneconomical.

Seventhly, when the reinforcing steel plate 400 is installed, it is not necessary to weld all the portions of the wale 100 which are in contact with the inner surface of the flange 120b, Since the cross-sectional area contacting the inner surface of the wristband 120b is wide and the wristband 100 is not displaced from the wristband 100, the welding time can be shortened.

Eighth, since each tube 200b and the reinforcing steel plate 400 are fixed to the wristband 100 by spot welding (SW), disassembly is much easier, so it is economical because it can be used many times instead of one time as a conventional steel plate.

Ninthly, when the pipe 200b is installed on the reinforcing steel plate 400, the reinforcing steel plate 400 and the pipe 200b are formed into a single integrated product to be sandwiched between the first and second flanges 120b of the wale band 100 It is economically advantageous because the construction is simple and the use frequency is increased.

================================================== =========

When the wale 100 is installed on the earth retaining wall 10 after the braces 40 are installed on the retaining wall 10, the respective pipes 200 and 200b can be installed after the installation is complete. Particularly, It is difficult to install the wale 100 on the upper side of the webs 100 and 110b because it is difficult to install the wale 100 on the lower side of the web 100 and 110b, The wale band 100 is installed on the earth retaining wall 10 after the pipes 200 and 200b are installed in advance at the steel material processing site.

The flanges 120 and 120b and the first and second flanges 120 and 120b of the wristband 100 refer to 122 or 122b or 124 or 124b in the drawing.

On the other hand, the parts other than the part shown in Fig.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as set forth in the following claims Or modification of the invention.

10: retaining wall 20: brace
100: welt 110, 110b:
120, 120b: flange 122, 122b: first flange
124, 124b: second flange 130: stiffener mounting portion
200, 200b: each tube 210, 210b:
222, 222b: inner side surface 224, 224b: outer side surface
230, 230b: lower surface 240, 240b: space
400: Reinforced steel plate B: Bolt
SW: Spot welding

Claims (4)

A first flange connected to the earth retaining wall;
A second flange to which a brace is connected, the second flange being spaced apart from the first flange;
A web connecting said first flange and said second flange;
And an empty space formed between the first flange and the second flange and formed by the top surface, both side surfaces connected to both sides of the top surface, the bottom surface connected to the both side surfaces, and the top surface, And a plurality of pipes,
Wherein each of the tubes has an upper surface, both side surfaces and an end surface of the lower surfaces abutting the first flange or the second flange,
And a reinforcing steel plate installed at least either between the respective pipes and between the first flanges or between the pipes and the second flanges,
Wherein the reinforcing steel plate is installed between the inner surface of the first and second flanges and the respective pipes,
Wherein the upper and lower lengths of the reinforcing steel plate are the same as the upper and lower lengths of the respective tubes or larger than the upper and lower lengths of the tubes,
Wherein both ends of the reinforcing steel plate are located on the outer sides of the respective pipes on both sides,
The web is positioned at the center of the upper and lower tubes and the reinforcing steel plate,
Wherein the upper and lower corrugated pipes and the reinforcing steel plate are spaced apart from each other by a predetermined distance,
The position of the reinforcing steel plate is fixed without being moved without welding even if there is a small gap between the reinforcing steel plate and the respective pipes because the pressure is elastically compressed and adhered by the earth pressure or the preceding load of the brace.
Since the rigidity of the position where the brace is connected is further increased by the reinforcing steel plate, the deformation is further reduced even when the earth pressure is increased or the brace is subjected to the preceding load,

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