JPS5822605B2 - Underground continuous wall construction method - Google Patents

Description

[Detailed description of the invention] This invention relates to the provision of a new underground continuous wall construction method.

As for the in-plane longitudinal joint method for underground continuous walls, for example, there has been a method published on September 1, 1975 in "Design and Construction of Underground Continuous Wall Construction Methods...Ndobuk Incorporated Association, Japan Construction Mechanization Association, Gihodo," Vol. As described in the "Construction" (95 joint work) column of Chapter 9 (interlocking pipe method,
Tenon method, partition steel plate method, precast concrete method, T-shaped block joint method, cast-in-place pile combination method,
Various methods have been developed, such as the shaped steel beam joiner method and the flanged connection method, but the reinforcing bar cages are not connected to each element, and even if the strength of the joints is satisfactory, it is difficult to construct interlocking pipes. It requires processes such as cutting in, edge cutting and pulling out, simple pulling out, and joining concrete blocks with bolts, so it is not easy to construct.In addition, the reinforcing bar cages are connected to each element, making it an ideal structure. There are many processes that are difficult to construct, such as pulling out block joints, assembling complicated reinforcing bar cages, chiseling and assembling reinforcing bars and formwork after excavating the trench, and erecting and pulling out joint boxes, etc. This has a major impact on costs.

The present invention has been made in view of the above circumstances, and if the reinforcing bar cage is connected to each element and is integrated into an ideal structure, it can be performed without all the above-mentioned steps. The aim is to provide an extremely good in-plane vertical joint method, and the gist of this is that after excavating a trench, members such as loop reinforcing bars or punched iron plates that satisfy the structural strength of the joint are attached to the side surface of the joint. A circular steel pipe or a square steel pipe corresponding to the locking pipe installed in the hole is buried to a depth below the excavation bottom, and if necessary, it is pressed down with gravel, etc., and after the reinforcing bar cage is inserted, concrete is poured including the inside of the core steel pipe. The goal is to do the following.

Hereinafter, details of the present invention will be explained based on the drawings.

1 in the figure is a circular steel pipe or a square steel pipe having an outer diameter equivalent to the trench width corresponding to the above-mentioned locking pipe used in the present invention, and the side surface in the direction of the joint is wrapped with a reinforcing bar cage to structurally satisfy the strength of the joint. Loop reinforcing bars, drawn iron plates, etc. 2... are provided.

An embodiment using a circular steel pipe is shown in FIGS. 1 to 4, and an embodiment using a square steel pipe is shown in FIG. 5.

In the construction method of the present invention, first, after completing the excavation of the trench 3, the steel pipe 1 is
are buried at the corners of the joints at both ends of the trench 3, to a depth below the excavation area where an anchor effect occurs.

Next, as a precaution, it is recommended to hold the concrete in place by filling it with gravel 4, etc., but this may be omitted if the anchoring effect is sufficient and the concrete can sufficiently withstand the lateral pressure (see Figure 1). ).

Next, the reinforcing bar nodes 5 are inked into the trench 3 in such a manner that both ends thereof are wrapped with the loop reinforcing bars, punched iron plates, etc. 2,
Concrete 6 is placed (Figure 2).

At this time, concrete is placed inside the trench 3 and the steel pipe 1 at the same time.

In other words, the steel pipe 1 is buried and becomes part of the element.

This completes one element.

After that, the adjacent element was completed in the same way, and the process was complete. Figure 3 shows the completion of trench 3' excavation of the adjacent element, and Figure 4 shows the inking of reinforcing bar joint 5' and the pouring of concrete σ. This figure shows a state in which integral connection with adjacent elements is completed.

According to the construction method of the present invention, the steel pipe 1 corresponding to the locking pipe is not simply placed on the bottom of the trench excavation, but is buried to a predetermined depth below the excavation area. It has the advantage that there is no need to worry about the concrete going around it, and it also becomes a buried joint, and the process of cutting and pulling out edges, such as in rocking pipes, does not require any heat (heating), which is extremely advantageous for workability.

[Brief explanation of drawings]

The figures show embodiments of the present invention, and FIG. 1A is a plan view of an initial process, FIG. FIG. Brief explanation of symbols: 1...Circular or square steel pipe, 2
...Loop reinforcing bar 1. Punched iron plate, 3, 3'... trench, 4... gravel, 5, 5'... reinforcing bar joint, 6. Gi...Pouring concrete.

Claims (1)

[Claims] 1 After excavating the trench, at the corner of the joint, members such as loop reinforcing bars or punched iron plates that satisfy the structural strength of the joint are placed on the side surface in the direction of the joint, and a circular steel pipe or square steel pipe with an outer diameter equivalent to the width of the trench is installed. After burying the steel pipe to a depth below the excavation bottom where an anchor effect occurs, a reinforcing bar cage is sunk into the trench with both ends wrapped around the loop reinforcing bars and punched steel plates, and then concrete is poured into the reinforcing bar cage. 1 and also inside the steel pipe.
An underground continuous wall construction method characterized by completing an element and then repeating this procedure for adjacent elements.