JPH0781267B2 - Joint structure of continuous underground wall - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a joint structure for a continuous underground wall, and more specifically, to a continuous underground structure in which adjacent wall bodies can be effectively coupled by a simple structure. The present invention relates to a wall joint structure.

“Conventional technology” In recent years, the continuous underground wall construction method (such as the Takenaka continuous underground wall construction method developed by the applicant) has been adopted for the construction of basement floors of buildings on soft ground, etc. ing.

The continuous wall constructed by this continuous underground wall method is to construct a wall body for each unit length in consideration of the ground conditions and construction conditions. , It is necessary to connect the walls to each other for each unit length.

Conventionally, as shown in FIG. 5 and FIG. 6, a method using a lap joint is adopted for connecting the wall bodies to each other, and a plurality of U-shaped anchor rebars 2 are formed on the H-shaped steel 1 as in-plane connectors. What was welded was used.

According to the in-plane connector, U welded to H-section steel 1
The shaped anchor rebar 2 can effectively transmit in-plane shear stress and the like during an earthquake. In addition, in FIG.
3 and 4 indicate the lateral wall of the forward and backward units,
A lap joint is formed between the U-shaped anchor rebars 2 and 2 described above. Further, 5 and 5 indicate auxiliary plates.

"Problems to be solved by the invention" However, in the conventional joint structure as described above,
In the in-plane connector, the transmission of in-plane shear stress is focused and the transmission of out-of-plane stress (shear, bending) is not incorporated in the design. Cannot be designed as a two-way support plate. In addition, the use of H-shaped steel causes a large amount of steel material, and the welding amount of the U-shaped anchor rebar is large, leading to an increase in cost. Further, since the size and weight of the H-section steel are limited, it is not possible to sufficiently cope with an increase in the size of the wall body (a large wall thickness). There were various problems.

Therefore, an object of the present invention is to solve the above problems by rationally simplifying the joint structure.

[Means for Solving the Problems] In order to achieve the above object, the joint structure of a continuous underground wall according to the present invention has a guide plate on one surface of a partition plate interposed between continuous wall units and a pair on the other surface. Mounting plates of the in-plane connector are vertically installed, and U-shaped anchor rebars are inserted and held on both sides of the partition plate from the guide plate side in multiple stages to form an in-plane connector. While fixing the lateral wall of the preceding unit side to,
It is characterized in that transverse wall reinforcements on the trailing unit side are arranged on the sides of the U-shaped anchor reinforcements protruding toward the guide plate.

"Action" Because of the above-mentioned configuration, the dowel action of the U-shaped anchor rebar transmits the out-of-plane and in-plane shear stress between the walls (see Figs. 4 (A) and 4 (C)), and Out-of-plane bending stress (see FIG. 4 (A)) and in-plane bending stress (see FIG. 4 (B)) are transmitted by the attachment action (lap joint) between the U-shaped anchor reinforcement and the lateral wall of each unit. . The guide plate reinforces the partition plate, functions as a water stop plate for the splicing portion, and further functions as a guide rail for a cleaning machine or the like for submerged cleaning of the wall surface of the succeeding unit. The mounting plate also functions as a water blocking plate and a reinforcing material.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in the excavation groove A for the continuous underground wall excavated by the excavator, the reinforcing bar cage 11 on the leading unit side and the reinforcing bar cage on the trailing unit side, which are formed by integrating the in-plane connector 10, are formed. 12 and are built.

The in-plane connector 10 includes a flat plate-shaped partition plate 13 having the same width as the excavation groove A, a T-shaped steel 14 as a guide plate vertically installed in the center of one surface of the partition plate 13, and the other surface of the partition plate 13. A pair of mounting plates 15 and 15 provided vertically on both sides, and a U-shaped anchor rebar which is positioned inside the mounting plates 15 and 15 in the partition plate 13 and which is paired and held in a multistage manner. 16
It consists of ... and. As shown in FIG. 2, the U-shaped anchor rebar 16 has two leg rods 16a, 16a inserted into the through holes 1a, 13a formed in the partition plate 13 from the T shape 14 side. The one half of the base rod portion 16b side is projected to the T-shaped steel 14 side and held by the partition plate 13. The above T
The shaped steel 14 and the mounting plates 15 and 15 are appropriately welded to the partition plate 13.

Then, the wall transverse bars 11a ... In the reinforcing bar cage 11 on the preceding unit side are fixed to the respective mounting plates 15, 15 of the in-plane connector 10 configured as described above by welding or the like. On the other hand, the wall transverse bars 12a ... and the wall longitudinal bars 12b ... in the rebar cage 12 on the trailing unit side are located outside of the base rod 16b half of the U-shaped anchor rebar 16 ... Are arranged with a predetermined amount of lap. In addition, each lateral wall 12a on the trailing unit side
The fixing plate 17 is fixed by welding or the like between the tip portions of.

With this configuration, in the present embodiment, the dowel action of the above-mentioned U-shaped anchor rebars 16 ... And the attachment action of the U-shaped anchor rebars 16 and the lateral wall reinforcements 11a and 12a on each unit side cause the fourth It can cope with various in-plane and out-of-plane stresses as shown in the figure.

The T-shaped steel 14 and the mounting plates 15 and 15 add various functions as described above.

In addition, in this embodiment, the lateral wall streaks 12a on the trailing unit side ...
Since the fixing plate 17 is welded between the tip ends of the U-shaped anchor rebars 16, even if the plate on the side of the base rod 16b of the U-shaped anchor rebar 16 is slightly shaken, it does not interfere with this and the trailing unit side The rebar cage 12 can be installed smoothly. Of course, the fixing plate 17 provides a U-shaped effect on the lateral wall reinforcement 12a side corresponding to the U-shaped effect of the U-shaped anchor rebar 16.

[Advantages of the Invention] As described above, according to the present invention, various in-plane and out-of-plane stresses can be dealt with in the joint portion, so that the bidirectional support plate design can be easily performed as the underground outer wall.

In the in-plane connector, since the H-shaped steel is not used and the U-shaped anchor reinforcing bar is not welded, the amount of steel and welding can be reduced, the cost can be reduced, and the wall can be sufficiently enlarged.

The U-shaped anchor rebar insertion method allows you to easily adjust the amount of U-shaped anchor rebar (pitch, diameter, etc.) and design according to the stress.

Due to the U-shaped effect of the U-shaped anchor rebar, the joint length of the rebar on the trailing unit side can be shortened and the workability of the trailing unit can be improved.

Since the in-plane connector and the rebar cage can be easily integrated, workability can be improved.

Since the guide plate necessary for construction can be used as a permanent installation (water stop plate) as a guide rail for cleaning, it leads to cost reduction.

By using the guide plate, the splicing part can be easily cleaned, so the quality of the continuous underground wall can be improved.

Various effects such as are obtained.

[Brief description of drawings]

FIG. 1 is a cutaway plan view showing an embodiment of the present invention,
2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is the first III.
-III line sectional drawing, FIG. 4 is each explanatory drawing of each stress which arises between adjacent wall bodies, FIG. 5 is the top view which shows a prior art example, FIG.
The figure is a perspective view of the main part. 10 …… In-plane connector 11 …… Reinforcing bar cage on the preceding unit side 12 …… Reinforcing bar cage on the following unit side 13 …… Partition plate, 14 …… T-shaped steel 15 …… Mounting plate, 16 …… U-shaped anchor rebar 11a, 12a ...... Wall lateral stripes

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Sato 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Kazuhiro Inoue 8-21, Ginza, Chuo-ku, Tokyo No. 1 Stock Company, Takenaka Corporation Tokyo Main Store (56) References JP-A-56-67015 (JP, A)

Claims (1)

[Claims] 1. A guide plate is vertically provided on one surface of a partition plate interposed between continuous wall units, and a pair of mounting plates is vertically installed on the other surface thereof, and U-shaped anchor rebars are provided on both sides of the partition plate. An in-plane connector is constructed by inserting and holding the guide plate side in multiple stages, and a wall transverse bar of the preceding unit side is fixed to the mounting plate of the in-plane connector, and a U-shaped anchor rebar protruding toward the guide plate side. A joint structure for a continuous underground wall characterized by lateral wall reinforcement on the trailing unit side.