JPS5988533A - Coupling steel member of underground continuous wall - Google Patents

Abstract

PURPOSE:To raise the shearing stress in the vertical direction in the joints of a wall body by making up a part or all of a partition steel plate to partition the end part of the preceding underground wall by using a corrugated plate whose wave direction is vertically directed. CONSTITUTION:An interlocking pipe 21 is placed at the end part of the inside of a trench, and a coupling steel member A consisting of a partition steel plate 10, a water-sealing plate 11, and joining iron bars 12 is supportingly inserted through a supporting block 22 in relation to the pipe 21 into the trench 20. A sheet 23 to prevent the leak of concrete is laid, a main iron bar 24b is penetrated, and concrete is placed into the trench 20. Afterwards, the ground to be constructed is excavated, the main iron bar 24b is penetrated, the coupling steel material A is cleaned to remove soil, etc., and then concrete is placed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint steel material for connecting a part to be constructed first and a part to be constructed later when constructing an underground continuous wall.

In general, this kind of joint steel material for underground continuous walls is used to partition the ends of the parts to be constructed first, to integrate the parts to be constructed later, and to prevent water leakage from the joints. In order to obtain shear stress in the vertical and horizontal directions at the joint after construction, conventionally, stud reinforcing bars 3 were provided protruding from both sides of the partition steel plate 1 in addition to the joining iron fs2, as shown in Figs. 1 and 2. It is known that the shear stress at the wall joint portion is increased by welding the cotter plates 4 in the horizontal direction.

However, in such a conventional structure, the shape of the joint steel material is complicated, and it is difficult to clean the joint steel material, which is contaminated with dirt and other impurities mixed in with the bentonite liquid that is filled in the trench until concrete pouring is complete. (Also, when pouring concrete through a Remy pipe, the slime that accumulates at the bottom of the concrete surface and rises with the concrete surface hits the stud lines of the tarp plate and gets rolled up into the concrete.) concrete of the desired quality may not be obtained, or the concrete 1
- The joint tends to wrap around the joint insufficiently, making it impossible to obtain the desired shear stress not only in the vertical direction but also in the horizontal direction, and furthermore, there are problems such as insufficient water-stopping properties.

In view of the above-mentioned problems, the present invention aims to simplify the shape of the joint steel material itself, makes it easy to clean mud etc. adhering to the joint steel material, and prevents the entrainment of slime that tends to rise with the concrete during concrete pouring. The purpose is to provide a joint steel material for underground continuous walls that can reduce the shear stress in the vertical direction at wall joints and increase the shear stress in the vertical direction at wall joints. In a joint steel material for an underground continuous wall, which has a partition steel plate that partitions the ends, and has a water stop plate and a joint reinforcing bar perpendicularly arranged on both sides of the partition steel plate, the entire width or a part of the partition steel plate is The joint steel material of underground joint II is characterized by being constructed with corrugated plates oriented vertically.

Next, an example of the implementation of the present invention will be explained with reference to the drawings from FIG. 3 onwards.

FIG. 3 is a perspective view of a joint steel material according to the present invention, and this joint steel material has a central partition portion 10a and both end partition portions 10b, 10b, which constitute a partition steel plate.
, 10b has a T-shaped water stop plate 11.11 arranged in a T-shape on the central end thereof, and the central partition part 10a and the central partition part 10a are integrally welded to each other.

On the other hand, a corrugated plate curved with the wavelength direction directed upward and downward is used for the central partition portion 10a.

Further, both ends of a large number of U-shaped joining reinforcing bars 12 are vertically arranged and welded to the side surface of each water stop plate 11 in the direction of extension thereof.

When using a joint steel material constructed in this way, as shown in Fig. 4, an interlocking pipe 21 is driven at the end of a wall trench 2o that is excavated from the ground surface, and the interlocking pipe 21 is The joint steel material is supported and inserted into the pipe 21 via the bearing block 22,
A sheet 23 for preventing concrete leakage is stretched, a steel B 24a is inserted, and concrete is poured into the trench 2o using a tremie pipe.

After constructing the previously constructed part in this way, as shown in Fig. 5, excavation of the later constructed part is carried out, and the main reinforcing bar 24b is inserted.
After removing mud, etc. that adhered to the joint rope material that partitions the end of the previously constructed part, concrete 1 is removed using a tremie pipe.
・Place.

In addition, although the above-mentioned embodiment shows an example in which a corrugated sheet is used as a part of the partition steel plate, the entire surface of the partition steel plate 30 may be constructed with a corrugated sheet, as shown in FIG. ,
In this embodiment, the partition steel plate 30 is a pair of corrugated plates 30a, 3
A water stop plate 31 is welded between both corrugated plates 308 and 308, and sheets are attached to both ends with plates 32 and 3.
2 is welded to the T-shaped device, and joining reinforcing bars 33 are offset to the outer ends of both corrugated plates 30a and 30a and welded to both sides. Note that 34 in the figure is a vertical reinforcing bar.

The joint steel material of the present invention is constructed as described above, and a part or all of the partition steel plate that partitions the end of the underground wall to be constructed in advance is constructed with a corrugated plate with the wavelength direction facing up and down. The concrete to be applied and the concrete to be applied later engage with the unevenness of the corrugated plate, and as a result, the corrugated end faces of both the concrete applied earlier and later engage with each other, and together with the presence of reinforcing bars for joining, the shear stress in the vertical direction is increased. This eliminates the need for conventional cotter steel and numerous stud reinforcing bars, and the surface in contact with the concrete is a smooth curved surface, making it easier to clean adhering mud, etc. This prevents the entanglement of precipitated slime that rises as concrete is poured, and it is expected that concrete will be easily filled into every corner of the joint so that the concrete at the joint will have the desired strength, resulting in a simpler structure. This has made the joint steel material lighter, improving work efficiency in wall construction, and lowering manufacturing costs in terms of the material and assembly labor of the joint steel material itself.

In addition, the corrugated steel plate for the joint needs to be strong enough to maintain its shape until the concrete hardens, so it is easy to process the corrugated plate if it is as thin as possible.
Weight reduction can also be measured.

[Brief explanation of drawings]

FIGS. 4 and 5 are sectional views showing steps in use, respectively, and FIG. 6 is a perspective view of another embodiment of the invention. 10.30...Partition steel plate, 11.31...Water stop plate, 12,. 33・
...Reinforcing bars for joining. Patent applicant: Pentayo Construction Co., Ltd. Figure 1, Figure 1N2, Figure 5

Claims (1)

[Claims] (1) Underground @wall construction that has a partition steel plate that partitions the end of the underground wall that is constructed in advance, and has water stop plates and joint reinforcing bars perpendicularly perforated on both sides of the partition steel plate. A joint steel material for an underground continuous wall, characterized in that the entire width or part of the partition steel plate is composed of a corrugated sheet with the wavelength direction oriented vertically.