JPH03244709A - Joining underground continuous wall and body installed later - Google Patents

Abstract

PURPOSE:To simplify curing and reduce amount of scraping by constructing an underground continuous wall with a reinforcing rod embedded on the main body side end which rod is provided with a plate welded in advance, placing concrete, and connecting the reinforcing rod of a following main body to the plate by welding. CONSTITUTION:An underground continuous wall W is constructed with a reinforcing rod 1 wound around a main reinforcing rod 5 combined with an auxiliary reinforcing rod and with a plate 3 of a disc shape or the like joined by stud welding. The plate 3 welded in advance to the rod 1 after excavating the ground for connecting to a reinforcing rod 2 to be placed in a structure S to be installed later is connected to the rod 2 by welding so that the wall W and the structure S is joined into one body. After welding the rod 2, a main rod 7 and an auxiliary rod 8 for the structure to be installed later are arranged and concrete is placed around those rods to form a column of the underground structure. Joining the following structure S to the rod 2 is made by welding with the plate portion only scraped. This improves installation efficiency.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for joining an underground continuous wall and a post-casting framework, which integrates the underground continuous wall constituting an underground structure with a later-constructed framework. It is related to.

(Problem to be solved by the invention) For underground structures, a continuous wall is first constructed to stop water and retain soil around the structure, and later the soil and stones inside the wall are excavated and a frame is constructed there. However, in order to make the underground continuous wall part of the structure and make it a permanent structure, it is necessary to integrate it with the post-casting frame.

Conventionally, as shown in Figures 6 to 8, after excavating the ground, the reinforcing bars arranged in the form of strips were exposed, new concrete was exposed, and the bent portions were bent back into straight lines to be used for later casting. Integration is achieved by burying it in concrete.

However, with this method, it is necessary to cure the part that is being bent back in advance to prevent concrete or mud from adhering to it when pouring concrete for the continuous wall, and at the same time, it is necessary to fold the part that is being bent back over its entire length, so it is difficult to polish the concrete. The reality is that there is a large amount of soil, and the work involved in constructing the continuous walls and constructing the post-casting frame becomes extremely complicated.

Furthermore, unbending the reinforcing bars depends on human power, but since relatively large-diameter reinforcing bars are used for the continuous walls, this work is not easy and has problems such as a lack of reliability.

This invention was made based on this background, and aims to propose a new joining method that solves the above-mentioned problems.

(Means for Solving the Problems) In the present invention, an underground continuous wall is constructed by burying reinforcing bars to which bullets are welded in advance at the end of the post-casting frame, and after grinding the concrete, this plate is By welding the reinforcing bars of the cast structure and connecting both reinforcing bars, we aim to simplify curing and reduce the amount of bending, and eliminate the need for unbending work, solving all the problems of conventional methods.

Only the plate portion of the concrete is folded, and the reinforcing bars embedded in the underground continuous wall remain as they are, and the reinforcing bars from the frame are welded onto the plates.

(Example) The present invention will be explained below based on the drawings showing one embodiment.

This invention combines reinforcing bars 1 to be buried in a previously constructed underground continuous wall W, and reinforcing bars 2 to be placed in a post-casting frame S constructed after ground excavation, which are welded to the reinforcing bars 1 in advance. This method connects the plates 3 by welding reinforcing bars 2 to integrate the underground continuous wall W and the frame S.

As shown in FIG. 1, the reinforcing bar 1 is formed into a gate-shaped band reinforcing bar, and plates 3, such as disc-shaped plates, are welded to both ends of the reinforcing bar 1 by stud welding or the like.

This plate 3 is covered with packing tape or the like for the reinforcing bars 2 to be melted later, and is cured from the time when the concrete 4 of the underground continuous wall W is placed until it is folded.

Plate 3 is for both reinforcing bars 1 when reinforcing bars 2 are welded. In order to ensure the precision of alignment of the two axes, it is preferable that the diameter is small.

The underground continuous wall W is constructed by arranging the reinforcing bars 1 in a combination of auxiliary reinforcing bars 6 and wrapping them around 5 main bars (vertical bars), as shown in FIG.

After constructing the underground continuous wall W and excavating the ground inside it, the plate 3 is exposed by folding only the plate 3 portion of the concrete 4 as shown in FIG.

As shown in FIGS. 3 and 4, reinforcing bars 2 on the side of the frame S are welded onto the surface of this plate 3 by stand welding or the like to connect both reinforcing bars 1.2.

Since the connection by stud welding can be completed in a short time, it is possible to perform the work much more efficiently than the conventional bending and unbending method.

FIG. 5 is an enlarged view of the plate 3 portion of FIG. 4.

After the reinforcing bars 2 are welded, the main bars 7 and auxiliary bars 8 of the post-cast frame S are arranged, and concrete is placed around them to construct the columns of the underground structure.

(Effects of the Invention) This invention is as described above, and an underground continuous wall is constructed by burying reinforcing bars with plates welded to the ends in advance, and the reinforcing bars of the cast frame are connected after folding the concrete only in this plate part. Since this is done by welding, the amount of bending of the concrete is greatly reduced, and curing of the reinforcing bars is simplified, which reduces the work required for these, and eliminates the need to unbend the reinforcing bars. As a result, construction efficiency will be improved.

[Brief explanation of drawings]

Figures 1 to 3 show the working procedure of the present invention.
■ is a longitudinal sectional view, ■ is a plan view, Figure 4 is a cross-sectional view showing a part of Figure 3 - ■, Figure 5 is a partially enlarged view, and Figures 6 to 8 are of the conventional method. The procedure is shown in which ■ is a longitudinal sectional view and ■ is a plan view. W...Underground continuous wall, S...Structure, 1.
...Reinforcing bars, 2...Reinforcing bars, 3-----plates, 4...Concrete, 5...
Main reinforcement, 6...Auxiliary reinforcement, 7...Main reinforcement, 8
...Auxiliary muscles. Figure 4 Figure 6 Figure ■ ■ Figure ■ Figure ■

Claims (1)

[Claims] (1) Connecting the reinforcing bars buried in the previously constructed underground continuous wall and the reinforcing bars arranged in the post-drilling frame constructed after excavating the ground surrounded by the underground continuous wall, This is a method of integrating the underground continuous wall and the frame.The underground continuous wall is constructed with reinforcing bars to which plates are welded in advance buried at the end of the underground continuous wall, and after excavating the ground, the concrete is cut to form the plates. A method of joining an underground continuous wall and a post-casting skeleton by exposing the plate and welding the reinforcing steel of the skeleton onto this plate to connect both reinforcing bars.