KR20190073965A - Integrated junction structure of continuous type girder and pier - Google Patents

Abstract

The present invention relates to an integrated bonding structure of a continuous-type girder and a pier, comprising: the pier; girders continued on an upper side of the pier in a bridge axial direction to be separated at right angles to the bridge axis; strong coupled/bonded rebars whose lower side is buried in the pier and which are installed on both sides of the girders; cross beam rebars placed in an upper side of the pier to be at right angles to the strong coupled/bonded rebars; and a cross beam block placed and hardened in an upper side of the pier to integrate the pier, strong coupled/bonded rebars, cross beam rebars, and girders. The strong coupled/bonded rebars are extended to cover a neutral axis of the girders. The present invention is able to strongly couple/bond the pier and girders by using the strong coupled/bonded rebars for a continuous-type girder bridge, omit the components of an extension connection apparatus and a bridge support, reduce construction costs, reduce maintenance costs while commonly using the girders, eliminate the need to control traffic while performing the maintenance, avoid social costs by blocking traffic for the maintenance, reduce maintenance costs, place a lower plate concrete on a lower side surface between the girders, increase the compression rigidity of the girders, efficiently deal with compression stress generated by a negative moment on a point unit of the pier′s girders, and prevent the girders from being compressed and destroyed.

Description

[0001] The present invention relates to a continuous girder and a pier integrated structure,

TECHNICAL FIELD [0001] The present invention relates to a continuous girder and a pier-integrated joining structure, and relates to a technique of integrating a pier and a continuous girder by a rigid-joining structure and a hinge-joining structure.

In a normal bridge, a bridge support is installed on the upper side of the pier, and an expansion joint is installed between the girder and the girder.

The elastic support used as the bridge support incurs costs due to construction. Also, the elastic support is deformed due to the expansion and contraction due to the temperature load, and the deformed elastic support is not recovered, so that a step is formed between the bridge and the alternation in the alternation, which may hinder the stability of the driving. In addition, since the elastic bearing after a certain period of time has been corroded or hardened, it is required to be replaced. In addition to the increase in the maintenance cost due to the replacement, there arises a cost for installing the maintenance inspection facility. In addition, Social costs increase.

Expansion joints also incur costs due to the construction of expansion joints. In addition, the running ability due to the expansion joint is lowered, and the periphery of the expansion joint device is continuously damaged by the vehicle or the like. Also, it is necessary to replace the expansion / contraction device after a certain period of time, which increases the maintenance cost due to the replacement and increases the social cost due to the traffic interruption due to the replacement.

Therefore, it is required to develop a technique to remove the bridge support and the expansion joint from the upper side of the bridge.

Patent 1: Korean Registered Utility Model No. 20-0300023

In order to solve the above-mentioned problems, the present invention provides a continuous girder and a pier-integrated joining structure in which a continuous type girder is placed on the upper side of a pier and a stretch joint is omitted and the girder and the pier are integrated, ≪ / RTI >

The continuous girder and pier integrated integration structure according to an example of the present invention includes a bridge bridge; Girders which are continuous on the upper side of the pier and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis; Reinforced steel rods embedded in the piers at the lower part and installed at both sides of the girders; Intersecting reinforcing bars arranged in an orthogonal direction to the rigid-connection reinforcing bars at an upper side of the bridge pier; And a girder block for integrating the girder, the girder, the girder, and the girder, wherein the girder is reinforced to a height above the neutral axis of the girders And is extended.

In addition, a support for supporting a girder is provided between the piers and the girders so that the girders are spaced apart from the upper surface of the bridge by a predetermined distance.

The bottom plate concrete further includes a bottom plate concrete which is lowered between the girders and cured before and after the throttling direction to resist compressive stress caused by the momentum of the bridge pier.

Further, the girder may be a PSC (prestressed concrete) girder, a steel girder, or a steel composite girder.

Further, another embodiment of the continuous girder and pier-integrated joining structure according to an example of the present invention includes: a bridge; Girders which are continuous on the upper side of the pier and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis; Reinforced steel rods embedded in the piers at the lower part and installed at both sides of the girders; Intersecting reinforcing bars arranged in an orthogonal direction to the rigid-connection reinforcing bars at an upper side of the bridge pier; Wherein the girder is a steel rectangular box, and the cross bar is integrally formed with the girder by inserting the girder, the girder, the reinforcing bars, the girder, And an opening reinforcing member provided in a lattice shape in the opening portion, wherein the rigid-bonded reinforcing bars and the crossbar block are also provided on the inner side of the rectangular box .

Further, the steel-reinforced reinforcing bars may extend beyond the neutral axis of the rectangular box.

The apparatus may further include a front end member coupled to a lower surface of the rectangular box and inserted into the block out portion formed on the upper side of the pier.

Further, the bottom plate concrete further includes a bottom plate concrete which is lowered in the inside of the rectangular box and is cemented before and after the throttling direction and is resistant to compressive stress caused by the moment of the bridge pier.

Further, another embodiment of the continuous girder and pier-integrated joining structure according to an example of the present invention includes: a bridge; A front end pocket portion formed on the upper side of the bridge pier formed in a direction orthogonal to the throat; Reinforced steel bars spaced apart from each other by a predetermined distance in a direction orthogonal to the throat; Square boxes which are continuous on the upper side of the piers and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis and are steel girders with openings formed on the lower surface facing the piers; An opening reinforcing member provided in a lattice shape in the opening portion; And a crossbar block for integrating the bridge pier, the rigid-connection reinforcing bars, the girders, and the opening reinforcing member by being placed on the upper side of the pier, and the rigid- As shown in FIG.

Further, an elastic filler may be provided between the bridge piers and the rectangular boxes, and before and after the front end pocket portions in a direction perpendicular to the pivot axis, and the rectangular boxes are mounted at a predetermined distance from the upper surface of the bridge piers.

Further, the bottom plate concrete further includes a bottom plate concrete which is lowered in the inside of the rectangular box and is cemented before and after the throttling direction and is resistant to compressive stress caused by the moment of the bridge pier.

In addition, a horizontal stiffener partition wall may be provided between the crossbar block and the bottom plate concrete.

According to the present invention, it is possible to omit the expansion joint device and the bridge support, thereby reducing the construction cost, lowering the girder height, and lengthening the span.

In addition, there is no need to replace the expansion joint and the bridge support, and the maintenance cost can be saved while being shared.

In addition, there is no social cost because there is no need for traffic control for maintenance such as replacement of expansion joints and bridge supports.

Also, since there is no expansion joint or bridge support, the bridge has excellent running characteristics.

In addition, by placing the bottom plate concrete on the lower side between the girders, the compression stiffness of the girder is increased, so that it is possible to efficiently cope with the compressive stress caused by the moment of the bridge pier.

Figs. 1A to 1C are cross-sectional views showing a state in which a continuous girder and a pier-integrated joining structure according to an example of the present invention are implemented with a PSC U-shaped girder.
Figs. 2A and 2B are cross-sectional views showing a state in which a continuous girder and a pier-integrated joining structure according to an example of the present invention are implemented by a PSC I-type girder.
Figs. 3A to 3B are cross-sectional views showing a state in which a continuous girder and a pier integrated-joint structure according to an example of the present invention are implemented by a steel I-type girder.
4A to 4B are cross-sectional views showing a state in which a continuous girder and a pier integrated bonding structure according to another example of the present invention are implemented in a rectangular box.
5A to 5C are cross-sectional views showing a continuous girder and a pier-integrated hinge joint structure according to another example of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to refer to like elements throughout the drawings, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, May be "connected "," coupled "or" connected ".

1 to 3, a continuous girder and a pier integrated bonding structure, which is an example of the present invention, will be described below.

This embodiment includes a bridge 10; Girders (20) continuous on the upper side of the bridge pier (10) in the throttling direction and spaced apart at a predetermined distance in the direction perpendicular to the intersecting axis; Reinforced steel bars (30) buried in the bridge pier (10) and installed on both sides of the girders (20); Cross bar reinforcing bars (40) arranged on the upper side of the bridge pier (10) in a direction orthogonal to the steel reinforcing bars (30); The girder 20 is placed on the upper side of the bridge pier 10 to be cured so that the girder 20 is integrated with the bridge pier 10, the steel reinforcing bars 30, the cross bar reinforcing bars 40, 50), and the projective reinforcing bars (30) can extend to more than the neutral axis of the girders (20).

On the upper side of the bridge pier 10, girders 20 can be mounted. The girders 20 can be continuously or intermittently mounted in the throttling direction on the upper side of the pier 10. The girders 20 can be mounted at a predetermined distance in a direction perpendicular to the intersecting axis. The girder 20 may be a trapezoidal or I-type PSC girder, a steel girder or a steel composite girder.

A girder mounting bracket 60 may be provided between the bridge pier 10 and the girders 20. [ That is, the girder mounting bracket 60 may be provided at the center in the throttle direction. By providing the girder mounting bracket 60, the girders 20 can be spaced upward by a certain distance from the upper surface of the bridge pier 10. The lower portion of the girder 20 is not directly contacted to the bridge pier 10 because the girder 20 and the bridge pier 10 are integrated with each other and at the same time a certain spacing space is ensured, Can be prevented from being damaged. The girder mounting bracket 60 may be embedded in the inside of the crossbar block 50 described later.

The steel-reinforced reinforcing bars 30 may be provided on both sides of the girders 20 so that the lower portion is buried in the pier 10 and protruded upward. That is, the lower part may be buried in the girder 20 and the upper part may protrude above the girder 20 and be disposed on both sides of the girders 20 and embedded in the later-described crossbar block 50. The steel-reinforced reinforcing bars 30 may be formed to extend beyond the neutral axis of the girders 20. As the steel-reinforced reinforcing bars 30 are further extended upward, the coupling between the girder 20 and the bridge 10 can be strengthened. The steel-reinforced reinforcing bars 30 may be installed on the pier 10 in a lattice shape in the front, rear, left, and right sides. That is, they may be arranged in the front, back, left, and right on the upper side of the bridge 10 in the portion where the girders 20 are not installed.

Auxiliary reinforcing bars may be provided between the bridge pier 10 and the lower surface of the girder 20. That is, it can be installed in the pier 10 and partially exposed to the upper side so as to be close to the lower surface of the girder 20. The auxiliary reinforcing bars reinforce the concrete laid between the lower surface of the girder 20 and the bridge pier 10, so that the girder 20 can be firmly supported alternately. The auxiliary reinforcing bars are different from the reinforcing steel bars 30 in that the length of the auxiliary reinforcing bars projecting upward is short and positioned on the lower side of the girder 20.

The crossbar reinforcing bar 40 may be disposed on the upper side of the pier 10 in a direction orthogonal to the rigid reinforcing bar 30. That is, the reinforcing ribs 40 can be arranged on both sides of the girders 20 on the upper side of the bridge pier 10 in the direction orthogonal to the rigid reinforcing bars 30, that is, in the horizontal direction. The crossbar reinforcement 40 can increase the rigidity of the crossbar 50 together with the steel bar 30.

And the concrete block is placed on the upper side of the bridge pier 10 to form the bridge block 50. This crossbar block 50 is constructed such that the girder 20 is firmly coupled to the pier 10 by integrating the bridge 10, the reinforced reinforcing bars 30, the reinforcing bars 40 and the girders 20 . Therefore, the moment due to the load of the upper structure can be transmitted to the lower portion, and the earthquake resistance ability can be increased.

The bottom plate concrete 70 can be installed on the lower side between the girders 20 and on the front and rear sides in the throttle direction. Reinforcing bars can be placed inside the bottom plate concrete (70). The bottom plate concrete 70 can resist the compressive stress caused by the momentum generated at the point portion of the bridge 10 of the girder 20. [ Therefore, by increasing the resistance to the momentum acting on the girder 20, it is possible to reduce the length of the bridge or make the bridge low, and also to reduce the size of the girder 20.

4, a continuous girder and a pier integrated bonding structure according to another embodiment of the present invention will be described.

This embodiment includes a bridge 10; Girders (20) continuous on the upper side of the bridge pier (10) in the throttling direction and spaced apart at a predetermined distance in the direction perpendicular to the intersecting axis; Reinforced steel bars (30) buried in the bridge pier (10) and installed on both sides of the girders (20); Cross bar reinforcing bars (40) arranged on the upper side of the bridge pier (10) in a direction orthogonal to the steel reinforcing bars (30); The girder 20 is placed on the upper side of the bridge pier 10 to be cured so that the girder 20 is integrated with the bridge pier 10, the steel reinforcing bars 30, the cross bar reinforcing bars 40, Wherein the girder 20 is a rectangular steel box and includes an opening 80 opened in a lower surface of the rectangular box facing the bridge 10 and a lattice- And the reinforcing bar reinforcing bars 82 and the reinforcing bar reinforcement 82 may be provided on the inner side of the rectangular box.

In this embodiment, differences from the above-described embodiment will be mainly described. A portion not described in this embodiment can be applied by analogy with the above-described embodiment.

The girder 20 of the present embodiment may be a steel rectangular box. An opening 80 may be formed on a lower surface of the rectangular box, that is, a portion facing the bridge pier 10. The opening portion 80 may be provided with a lattice-shaped opening reinforcing member 82. The opening reinforcing member 82 can be welded to each other and welded to the openings 80 of the rectangular box at the ends thereof.

The jointed reinforcing bars 30 and the crossbar block 50 in the above-described embodiment can also be formed inside the rectangular box. In other words, the steel-reinforced reinforcing bars 30 may be embedded in the lower portion of the girder 20 and the upper portion may extend inwardly of the rectangular box. The rigid-bonded reinforcing bars 30 embedded in the pier 10 may pass through the strip-shaped members of the opening stiffener 82 or may extend upwardly between the strip-shaped members. The steel-reinforced bars 30 may extend beyond the neutral axis of the rectangular box. The interposing reinforcing bars 40 may be arranged in the inside of the rectangular box as necessary. The strength of the connection between the bridge pier 10 and the girder 20 is significantly increased and the rigidity of the fulcrum portion of the rectangular box can be greatly increased by forming the steel-reinforced reinforcing bars 30 and the crossbar block 50 on the inside of the rectangular box. A horizontal stiffener partition wall 22 is provided at the front and rear ends of the crossbar block 50 to seal the rectangular box. The transverse stiffener partition wall 22 facilitates the insertion of the crossbar block 50 inside the square box and increases the rigidity of the square box of the flank section.

A block-out portion 90 may be formed on the lower side of the lower side of the rectangular box and on the upper side of the bridge 10. The block-out portion 90 may be provided with a front end member 92. The front end member 92 may be welded to the lower side of the rectangular box, embedded in the inside of the block-out portion 90, and embedded in the concrete to be poured. That is, the front end member 92 is joined to the lower side surface of the grate box by welding or the like, the front end member 92 is inserted into the inside of the block out portion 90, So that the member 92 can be embedded. So that the square box can be firmly coupled to the bridge pier 10.

A bottom plate concrete 70 may be laid on the inner lower side of the rectangular box. The bottom plate concrete (70) can be placed in the front and rear permanent parts in the throttling direction. Therefore, the bottom plate concrete 70 placed on the inner lower side of the rectangular box can increase the resistance to compressive stress due to the momentum occurring at the bridge 10 of the girder 20.

5, a continuous girder and a pier integrated bonding structure according to another embodiment of the present invention will be described.

This embodiment includes a bridge 10; A front end pocket portion 100 formed on the upper side of the pier 10 in a direction orthogonal to the throat; Reinforced steel bars (30) spaced at a predetermined distance in a direction perpendicular to the throttling pockets (100) and having a lower portion embedded therein; Rectangular boxes which are continuous on the upper side of the bridge pier 10 in the direction of the throttle and are spaced apart from each other by a predetermined distance in a direction perpendicular to the bridge and are formed as openings 80 on a lower surface facing the bridge pier 10; An opening reinforcement 82 provided in the opening 80 in a lattice shape; The girder 20 and the opening reinforcing member 82 are integrally assembled by piercing the upper portion of the pier 10 and curing the pier 10 so as to integrate the girder 20, 50), and the rigid-connection reinforcing bars (30) may extend up to the neutral axis of the rectangular box.

In this embodiment, the same parts as those of the above-described embodiments are not described. Unexplained portions can be applied by analogy to the embodiments described above. The girder 20 of this embodiment is a steel rectangular box, and the girder 20 and the bridge 10 are hinged.

The front pockets 100 may be formed on the piers 10. The front end pocket portion 100 may be formed by being recessed in a direction perpendicular to the throttling axis. The front pocket portion 100 may be a triangular, square, or trapezoidal groove.

The lower ends of the steel reinforcing bars 30 may be embedded in the bridge pier 10 while being spaced apart from each other by a predetermined distance in the direction perpendicular to the throat. Reinforcing bars may be additionally disposed in the direction perpendicular to the throat before and after the steel-reinforced reinforcing bar 30. The reinforced concrete bars 30 installed in the front end pocket portion 100 and the concrete installed in the front end pocket portion 100 allow the girder 20 to be firmly coupled to the pier 10 and to serve as a hinge . The continuous girder 20 is firmly coupled to the upper portion of the pier 10 and rotatable about the front end pocket portion 100 so that the pier 10 resists only the horizontal force of the girder 20. [

The steel-reinforced reinforcing bars 30 of this embodiment can extend up to the neutral axis of the rectangular box. This is because the steel reinforced concrete bars 30 installed in the front pocket part 100 and the concrete placed in the front pocket part 100 secure the bridge pier 10 to the girder 20 and serve as a hinge To

The elastic filler 102 may be provided between the pier 10 and the rectangular boxes and on the front and rear of the front pocket 100 in the direction perpendicular to the throttling axis. The elastic filler 102 may allow the rectangular box to be spaced upwards from the pier 10 by a certain distance and to place concrete therebetween. This allows the girder 20 to be properly rotatable about the front end pocket portion 100. The elastic filler 102 can be removed after the concrete has hardened. The concrete poured between the elastic fillers 102 may be formed to be narrower than the width in the front-back direction of the bridge pier 10. This allows the bridge pier 10 and the girder 20 to be coupled in a hinged configuration.

As in the above-described embodiment, the bottom plate concrete 70 may be installed on the inner lower side of the rectangular box. The bottom plate concrete (70) can be installed before and after the throttling direction. The bottom plate concrete 70 can resist compressive stress caused by the momentum generated at the point portion of the bridge 10 of the girder 20. [ A transverse stiffener partition wall 22 may be provided between the crossbar block 50 and the bottom plate concrete 70.

The transverse stiffener partition wall 22 can seal the rectangular box as in the above-described embodiment. The transverse stiffener partition wall 22 facilitates the insertion of the crossbar block 50 inside the square box and increases the rigidity of the square box of the flank section.

As a result, according to the present invention, the girder 20 continuous on the upper side of the bridge pier 10 is placed, the steel reinforcing bars 30 embedded in the bridge pier 10 are disposed, It is not necessary to separately provide an expansion joint device and a bridge support by rigidly bonding or hinging the girder 20 and the bridge pier 10 by placing reinforcing bars 40 and concrete for integrating the reinforcing bars 40. Accordingly, It is possible to provide a continuous girder and pier integrated connection structure in which the pier 10 and the girder 20 are integrated with each other so that the cost is saved and the usability is good and the maintenance cost can be reduced.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all the constituent elements may be constituted or operated selectively in combination with one or more. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Pier
20: Girder
22: transverse stiffener bulkhead
30: Reinforced steel bars
40: Reinforcing bars
50: crossbar block
60: Stand
70: Low plate concrete
80: opening
82: opening stiffener
90: Block out part
92: front end member
100: shear pocket portion
102: Elastic filler

Claims (12)

pier;
Girders which are continuous on the upper side of the pier and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis;
Reinforced steel rods embedded in the piers at the lower part and installed at both sides of the girders;
Intersecting reinforcing bars arranged in an orthogonal direction to the rigid-connection reinforcing bars at an upper side of the bridge pier;
And a crossbar block for integrating the bridge pier, the rigid-connection reinforcing bars, the crossbar reinforcing bars, and the girders by being placed on the bridge pier and curing the bridge bridge,
Wherein the steel-reinforced reinforcing bars extend beyond the neutral axis of the girders.
The method according to claim 1,
Wherein a girder supporting base is provided between the bridge piers and the girders so that the girders are spaced apart from the upper surface of the bridge piers by a predetermined distance.
The method according to claim 1,
And a bottom plate concrete which is lowered between the girders and cured in front of and behind the throttling direction to resist compressive stress caused by the momentum of the bridge point.
The method according to claim 1,
Wherein the girder is a PSC girder, a steel girder, or a steel composite girder.
pier;
Girders which are continuous on the upper side of the pier and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis;
Reinforced steel rods embedded in the piers at the lower part and installed at both sides of the girders;
Intersecting reinforcing bars arranged in an orthogonal direction to the rigid-connection reinforcing bars at an upper side of the bridge pier;
And a crossbar block for integrating the bridge pier, the rigid-connection reinforcing bars, the crossbar reinforcing bars, and the girders by being placed on the bridge pier and curing the bridge bridge,
The girder is a steel square box,
An opening portion opened in a lower face of the rectangular box facing the bridge pier, and an opening reinforcing member provided in a lattice shape in the opening portion,
Wherein the steel-reinforced reinforcing bars and the crossbar blocks are also provided inside the rectangular box.
The method of claim 5,
Wherein the steel-reinforced reinforcing bars extend beyond the neutral axis of the square box.
The method of claim 5,
Further comprising a front end member coupled to a lower side of the rectangular box and inserted into a block out portion formed on the upper side of the bridge pier and embedded therein.
The method of claim 5,
Further comprising a bottom plate concrete which is placed inside and below the rectangular box and cured before and after the throttling direction to resist compressive stress caused by the momentum of the pierce point portion.
pier;
A front end pocket portion formed on the upper side of the bridge pier formed in a direction orthogonal to the throat;
Reinforced steel bars spaced apart from each other by a predetermined distance in a direction orthogonal to the throat;
Square boxes which are continuous on the upper side of the piers and which are spaced apart from each other by a predetermined distance in a direction perpendicular to the piercing axis and are steel girders with openings formed on the lower surface facing the piers;
An opening reinforcing member provided in a lattice shape in the opening portion;
And a crossbar block for integrating the bridge pier, the rigid-connection reinforcing bars, the girders, and the opening reinforcing member by being placed on the bridge pier and curing the bridge bridge,
Wherein the steel-reinforced reinforcing bars extend below a neutral axis of the rectangular box.
The method of claim 9,
Wherein an elastic filler is provided between the bridge piers and the rectangular boxes in front of and behind the front end pocket and in a direction orthogonal to the throttling direction so that the rectangular boxes are spaced apart from each other by a predetermined distance from the top surface of the bridge pier.
The method of claim 9,
Further comprising a bottom plate concrete which is placed inside and below the rectangular box and cured before and after the throttling direction to resist compressive stress caused by the momentum of the pierce point portion.
The method according to claim 8 or 11,
And a horizontal stiffener partition wall is provided between the crossbar block and the bottom plate concrete.

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