JPS6325128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous underground wall constructed underground using concrete, in which a continuous wall is interposed between an underground wall to be constructed first and an underground wall to be constructed later. This relates to joint steel materials for underground walls.

Generally, when constructing this type of continuous underground wall, a part of the underground wall is formed by digging trenches in the ground intermittently of a certain length and placing joint steel materials at both ends of the trenches. After that, trenches are dug between adjacent previously constructed underground walls to form later constructed underground walls, and adjacent underground walls are connected using the above-mentioned joint steel to form a continuous underground wall. was building. In this case, the joint steel between the underground wall that is constructed first and the underground wall that is constructed later has sufficient strength to withstand the shearing force caused by the out-of-plane horizontal force and the in-plane vertical force. It is necessary to create a structure that provides the following.

Conventionally, the shear stress has been improved by adjusting the overlap between the horizontal reinforcing bars for joining provided in the joint steel and the main reinforcing bars in the wall, or by using stud reinforcing bars or the like.

For example, the conventional joint steel material 1 has a previously constructed wall 2A and a later constructed wall 2B, as shown in FIGS. 1 and 2.
An H-shaped steel 4 is integrally welded to both widthwise ends of a partition steel plate 3 that partitions the two.
The flange of is used as a water stop plate 4A, and a loop-shaped horizontal reinforcing bar 5 for joining is welded to this water stop plate 4A so that the loop surface faces in the vertical direction so that it extends horizontally, and a partition steel plate is also used. It had a structure in which stud reinforcing bars 6 were horizontally welded and protruded from the plate surface of No. 3. The loop-shaped joining horizontal reinforcing bars 5 and the main reinforcing bars 7 in each of the walls 2A and 2B are overlapped, and the presence of the stud reinforcing bars 6 is made to withstand shear stress. Note that 8 is a reinforcing vertical reinforcing bar vertically welded to the horizontal reinforcing bar 5 and the main reinforcing bar 7, respectively.

However, in the joint steel material 1 having such a structure, since the adjacent walls 2A and 2B are separated by the partition steel plate 3, the wall stress cannot be continuously transmitted between the adjacent walls, and the wall The drawback was that body stress could not be distributed. In addition, in the conventional joint steel material 1, since a large number of horizontal reinforcing bars 5 and stud reinforcing bars 6 are welded to the partition steel plate 3, it is very time-consuming to manufacture, resulting in high cost. However, there was a drawback that it depended on the quality of the welding. Furthermore, in the conventional joint steel material 1, the partition steel plate 3
Since there are many protruding objects, it is difficult to clean before pouring concrete, and the concrete does not wrap around well during concrete pouring.

The purpose of the present invention is to improve the transmission of wall stress,
To provide a joint steel material for a continuous underground wall that is easy to manufacture, easy to clean on a partition plate during concrete pouring, and allows concrete to wrap around easily.

A joint steel material for a continuous underground wall according to the present invention includes a large number of folded horizontal reinforcing bars having an angle-shaped reinforcing bar part and a horizontal reinforcing bar part connected to the base end thereof, and a partition steel plate, and the partition steel plate is provided with a large number of through holes along the vertical direction, and each folded horizontal reinforcing bar has an angle reinforcing bar portion and a horizontal reinforcing bar portion separated on both sides of the partition steel plate, and the surface formed by the angle reinforcing bar portion is Each of the folded horizontal reinforcing bars, which are passed through each of the through holes and alternately penetrated through the partition steel plate so as to face in the vertical direction, and which are adjacently oriented in opposite directions, are connected to the apex of the angle-shaped reinforcing bar portion of one of the reinforcing bars. This is characterized in that the horizontal reinforcing bar portions of the other reinforcing bar facing this are respectively welded.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a first embodiment of the present invention. The joint steel material 1 of this embodiment includes a partition steel plate 3,
It is configured with a large number of folded horizontal reinforcing bars 9. A large number of through holes 10 are bored in the partition steel plate 3 in two rows along the vertical direction. Each folded horizontal reinforcing bar 9 is composed of an angle-shaped reinforcing bar 9A and a pair of horizontal reinforcing bars 9B that are connected to both ends of the base and are oriented parallel to each other. These folded horizontal reinforcing bars 9 are arranged such that the angle-shaped reinforcing bars 9A and the horizontal reinforcing bars 9B are separated on both sides of the partition steel plate 3, and each through-hole 10 is arranged such that the plane formed by the angle-shaped reinforcing bars 9A faces the vertical direction. Partition steel plate 3
They are being sent to you alternately. In each of the folded horizontal reinforcing bars 9 that are adjacent to each other in opposite directions, the apex of the angle-shaped reinforcing bar portion 9A of one reinforcing bar 9 and the horizontal reinforcing bar portion 9B of the other reinforcing bar 9 that opposes this are welded, respectively. . Moreover, vertical reinforcing bars 8 for reinforcement are welded to the horizontal reinforcing bar portions 9B on each side so as to extend upwardly and downwardly, forming a truss structure.

As shown in FIG. 4, such a joint steel material 1 is arranged vertically in advance at both ends of the wall 2A to be constructed first, so that the main reinforcing bar 7 and the horizontal reinforcing bar part 9B of the folded horizontal reinforcing bar 9 are Concrete is poured so as to overlap to construct the pre-constructed wall 2A. After that, a trench 12 is dug next to the wall 2A to be constructed, and a cage formed by the main reinforcing bars 7 is installed in it, so that the main reinforcing bars 7 and the horizontal reinforcing bars 9B of the folded horizontal reinforcing bars 9 overlap. Concrete is poured to construct the later constructed wall 2B, and the previously constructed wall 2A and the later constructed wall 2B are interconnected with the joint steel 1 to form a continuous underground wall.

In the continuous underground wall formed in this way, the joint steel material 1 is formed by the folded horizontal reinforcing bars 9 penetrating the partition steel plate 3, so that stress transmission in the horizontal direction is performed well. become. Furthermore, the presence of the angle-shaped reinforcing bar portion 9A provides a structure that can sufficiently withstand shear stress. Furthermore, in this joint steel material, only the folded horizontal reinforcing bars 9 are aligned in the vertical direction, making it easy to clean the joint steel material 1 before concrete pouring, and preventing concrete from going around during concrete pouring. Become good.

FIG. 5 shows a second embodiment of the invention. In the joint steel material 1 of this example, the partition steel plate 3 is formed by welding and connecting a plurality of H-shaped steels,
Water stop plates 4A are provided on both sides of the partition steel plate 3. In other respects, the configuration is similar to that of the first embodiment.

FIG. 6 shows a third embodiment of the present invention. In the joint steel material 1 of this embodiment, the chevron reinforcing bars 9A and the horizontal reinforcing bars 9B of adjacent folded horizontal reinforcing bars 9 are welded and connected by reinforcing truss reinforcing bars 11. Other configurations are similar to those of the second embodiment.

FIG. 7 shows a fourth embodiment of the present invention. In the joint steel material 1 of this embodiment, adjacent folded horizontal reinforcing bars 9 are separated by a partition steel plate 3.
An example is shown in which the same through-hole 10 is passed through. Other configurations are similar to those of the first embodiment.

8 and 9 show a fifth embodiment of the present invention. In the joint steel material 1 of this embodiment, as shown in FIG. 9, one horizontal reinforcing bar part 9B of the folded horizontal reinforcing bars 9 is omitted, and folded horizontal reinforcing bars 9 in the shape of a stick are used, and they are oriented in opposite directions. This shows an example in which adjacent folded horizontal reinforcing bars 9 are passed through the same through hole 10 of the partition steel plate 3.

As explained above, the continuous underground wall joint steel material according to the present invention has a structure in which a large number of folded horizontal reinforcing bars alternately penetrate through the partition steel plate, so that wall stress is transmitted through this joint. This can be done continuously even on steel materials, which has the advantage of dispersing wall stress. In addition, each folded horizontal reinforcing bar has an angle-shaped reinforcing bar part and a horizontal reinforcing bar part separated on both sides of the partition steel plate, and the top of each angle-shaped reinforcing bar part is welded to the horizontal reinforcing bar part of other folded horizontal reinforcing bars to create a truss structure. , and since the horizontal reinforcing bars of each folded horizontal reinforcing bar are superimposed on the main reinforcing bars, the structure can sufficiently withstand shear stress. Furthermore,
This joint steel material has a simple structure and a small number of welding points, so it is easy to manufacture, reduces costs, and has the advantage that it is easy to clean before concrete pouring and that concrete wraps around well.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional joint steel material, FIG. 2 is a horizontal sectional view of the joint steel material shown in FIG. 1 in use, and FIG. 3 is a perspective view of a first embodiment of the joint steel material according to the present invention. FIG. 4 is a horizontal cross-sectional view of the joint steel material shown in FIG. 3 in its used state, FIG. 5 is a horizontal cross-sectional view of the second embodiment of the joint steel material according to the present invention in its used state, and FIGS. 6 to 8 are Third, fourth and fifth joint steel materials according to the present invention
Each front view of the embodiment, FIG. 9 is a front view of a folded horizontal reinforcing bar used in the joint steel material of the fifth embodiment. 1...Joint steel material, 2A...previously constructed wall, 2B...
... Post-construction wall, 3... Partition steel plate, 4A... Water stop plate, 7... Main reinforcing bar, 9... Folded horizontal reinforcing bar, 9A... Angular reinforcing bar part, 9B... Horizontal reinforcing bar part,
10...through hole, 11...truss reinforcing bar.

Claims (1)

[Claims] 1. A large number of folded horizontal reinforcing bars having an angle-shaped reinforcing bar part and a horizontal reinforcing bar part connected to the base end thereof,
a partition steel plate, the partition steel plate is provided with a large number of through holes along the vertical direction, and each of the folded horizontal reinforcing bars has an angle reinforcing bar portion and a horizontal reinforcing bar portion separated on both sides of the partition steel plate. Further, each of the folded horizontal reinforcing bars, which are passed through the through holes and alternately penetrated through the partition steel plate so that the surfaces formed by the angle-shaped reinforcing bars face in the vertical direction, are adjacent to each other and are oriented in opposite directions. A joint steel material for a continuous underground wall, characterized in that the apex of an angle-shaped reinforcing bar part of one reinforcing bar and the horizontal reinforcing bar part of the other reinforcing bar opposing this are respectively welded.