JPH0428936Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a lightweight and easy-to-handle joint structure for continuous underground walls that can be used when constructing continuous underground walls with large cross-sections or great depths. be.

[Conventional technology]

Conventionally, when constructing continuous underground walls, joint plates or joint boxes made of steel were used to connect the preceding unit wall and subsequent unit wall with good continuity. In the case of large cross-section or deep underground walls, the weight of the joint becomes large.
There was a problem in that large heavy machinery such as a crane was required to suspend the construction into a trench dug underground, making it uneconomical.

[Purpose of invention]

This invention was developed to solve the problems of the previous model, and it is lightweight, has a simple structure, and can be suspended even on large cross-sections and deep continuous underground walls without the need for large heavy equipment. The purpose of this project is to provide a continuous underground wall joint structure that is possible.

[Summary of the idea]

In order to achieve the above objectives, the continuous underground wall joint structure of the present invention uses sheet fixing metal fittings to fix a bottomed bag-like canvas sheet, on which the internal concrete will be poured, to both ends of the horizontal reinforcing bars. After each joint section consisting of the basket-shaped joint main reinforcements is penetrated through each joint section along with its canvas sheet, the horizontal reinforcing bars and the joint main reinforcements of each joint section are fixed by welding.

The above-mentioned joint structure does not use a conventional steel joint box, so it is lightweight, and can be easily hung in an excavated trench after construction.
Concrete is poured into the canvas sheet of the joint, and then concrete is poured into the unit wall portion between the two joints.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a joint structure in an embodiment of the present invention, FIG. 2 is a plan sectional view of FIG. 1, and FIG.
The figure is a side view of FIG. 2, and FIG. 4 is a schematic plan view showing the procedure for constructing a continuous underground wall using the joint structure of FIG. 1.

First, as shown in FIG. 1, the joint part 1 of the present invention is constructed by inserting a canvas sheet 3 in the shape of a bag with a bottom into the main joint reinforcement 2 in the shape of a basket.
is fixed with sheet fixing fittings 4 provided at the upper end, and the horizontal reinforcing bars 5 of the preceding unit wall penetrate through the inside of the canvas sheet 3 at the joint portions 1 at both ends of the preceding unit wall, as shown in Fig. 2. As shown, the joint main reinforcement 2 of each joint part 1 and the horizontal reinforcement 5 of the preceding unit wall are fixed at each position by spot welding or the like at both ends of the horizontal reinforcing bar 5 of the preceding unit wall.

In addition, when the canvas sheet 3 is inserted into this basket-shaped joint main reinforcement 2, a horizontal hoop reinforcement 6 is attached for reinforcement, and the horizontal reinforcement 5 of the preceding unit wall is attached.
Vertical reinforcing bars 7 are attached to.

Next, the procedure for constructing a continuous underground wall using the joint structure of the present invention shown in FIGS. 2 and 3 will be explained.
Using a crane or the like, the reinforcing bars of the preceding unit walls having the above-mentioned joint structure at both ends are suspended from the preceding unit walls of A and B, and then the canvas sheet 3 of the joint part 1 is After the concrete 9A is hardened, concrete 9B is poured into the preceding unit walls A and B. At this time, concrete wraparound prevention sheets 11 are provided on both sides of the joint 1 to prevent concrete from leaking.

After the unit wall is constructed by pouring concrete for the preceding unit walls A and B, the reinforcing bar cage 10 of the succeeding unit wall is erected and concrete 9C is poured into the succeeding unit wall indicated by C. Then, the single wall of the trailing unit wall C is constructed, and the reinforcing bar basket of the leading unit wall having the above-mentioned joint structure at both ends is poured with concrete in the next leading unit wall D. After,
By repeating the construction of the remaining unit walls E, a continuous underground wall is completed.

[Effect of idea]

As explained above, the joint structure of the continuous underground wall of the present invention does not use heavy steel joint plates or joint boxes as in the past, but instead uses a lightweight joint in which a canvas sheet is fixed to the main reinforcement of the basket-shaped joint. The horizontal reinforcing bars of the preceding unit wall are penetrated through the horizontal reinforcing bars of the preceding unit wall, and the joints are lightweight, so large heavy machinery is not required when constructing continuous underground walls with large sections or deep depths.
Since it can be easily hung and erected, it has the effect of reducing work efficiency and work costs.

In addition, the canvas sheet at the joint has multiple outward bulges due to the concrete poured into it using horizontal hoop reinforcement, which has the advantage of increasing shear resistance and maintaining good continuity between each unit wall body.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a joint structure in an embodiment of the present invention, Fig. 2 is a plan sectional view of Fig. 1, Fig. 3 is a side view of Fig. 2, and Fig. 4 is a joint structure of Fig. 1. It is a schematic plan view showing the procedure of constructing a continuous underground wall using a structure. 1...Joint part, 2...Joint main reinforcement, 3...Canvas sheet, 4...Sheet fixing fittings, 5...Horizontal reinforcement, 9A, 9B...Concrete.

Claims (1)

[Scope of utility model registration request] At both ends of the horizontal reinforcement of the preceding unit wall of the continuous underground wall,
After passing the horizontal reinforcing bars of the preceding unit wall through the inside of the canvas sheet at each joint consisting of the main reinforcing bars of the basket-shaped joint to which the bottomed canvas sheet into which concrete is to be poured is fixed, the above preceding unit A continuous underground wall joint structure in which the horizontal reinforcing bars of the wall and the joint main reinforcement are fixed.