JPH0549764B2 - - Google Patents

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 in the area surrounded by this 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 8 and 9, a part of the skeleton side of the underground continuous wall was cut off, and the reinforcing bars on both sides were connected using mechanical joints such as grip joints and screw joints. conversion is being carried out.

In this method using mechanical joints, the reinforcing bars for the joint on the underground continuous wall are usually attached to the reinforcing bar cage using wires, etc. However, since the attachment method using wires does not provide sufficient fixation, it is fixed when concrete is poured. There are problems such as loosening of parts, time-consuming installation work, and troublesome curing of reinforcing bar joints before pouring concrete.

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, stud bolts are welded to the main reinforcing bars arranged on the skeleton side of an underground continuous wall, facing toward the skeleton side.
Alternatively, attach a base plate or clamp to the main reinforcement with the stud bolts connected, and connect the main reinforcement to the reinforcement by welding the reinforcing steel on the frame side to the stud bolt to ensure that the jointed stud bolt is fixed to the main reinforcement. and solve the problem of how to use grid wire.

Underground continuous walls are constructed with stud bolts embedded in concrete, and after excavating the ground, the concrete is partially removed to expose the heads of the stud bolts, and the reinforcing bars for the frame are welded onto these stud bolts. The connection between the main reinforcement and the reinforcing steel on the skeleton side is performed.

(Example) The present invention will be described below based on drawings showing one example.

This invention combines the main reinforcing bars 1 buried in the previously constructed underground continuous wall W and the reinforcing bars 2 arranged in the post-casting frame S constructed after the ground excavation.
It is connected by welding reinforcing bars 2 to stud bolts 3 that have been joined in advance to
This is a method of integrating the

FIG. 1 shows an embodiment in which stud bolts 3 are directly welded to main reinforcing bars 1.

In the embodiment shown in FIGS. 2 and 3, a base plate 5 is welded to the base of a stud bolt 3 in advance, and the base plate 5 is attached to the main reinforcement 1 using U bolts 6 passing through the base plate. FIG. 2 shows a case where one U-bolt 6 is used, and FIG. 3 shows a case where two U-bolts 6 are used to ensure fixation.

The embodiment shown in FIG. 4 is a case in which a clamp 8 is connected to the stud bolt 3 in place of the base putt 5 in the embodiments shown in FIGS. 2 and 3. By holding the main reinforcement 1 with this clamp 8, the main reinforcement 1 This is the case when the stud bolt 3 is connected. In this case, the U bolt 6 becomes unnecessary.

Concrete 4 is poured with the stud bolts 3 attached to the main reinforcements 1 facing the frame S side in the manner shown in Figs. 1 to 4, and the underground continuous wall W is constructed as shown in Fig. 5. .

After constructing the underground continuous wall W and excavating the ground inside thereof, only the heads 3a of the stud bolts 3 are removed from the concrete 4, as shown in FIG. 6, to expose the stud bolts 3.

After scooping the concrete 4, attach the reinforcing bars 2 on the frame S side to the heads 3a of the stud bolts 3 as shown in Fig. 7.
The reinforcing bars 1 and 2 are connected by welding by stud welding or the like.

After the reinforcing bars 2 are welded, the main reinforcements 7 of the post-cast framework S are placed, and concrete is placed around them to construct the framework of the underground structure as shown in FIG. 7.

(Effects of the Invention) This invention is as described above, and stud bolts are attached to main reinforcements by directly welding them to the main reinforcements, by attaching a pre-welded base plate using U-bolts, or by gripping them with clamps. Since the stud bolts are fixed, the fixed state of the stud bolts is ensured, the fixed points do not come loose during concrete pouring, and the work when assembling the reinforcing bar cage can be easily performed.

In particular, reinforcing bars can be attached directly by welding or by
Since it can be carried out using bolts or clamps, no special skills are required, and for the above reasons, the assembly work can be completed in a short time, improving construction efficiency.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, where is a longitudinal sectional view, is an elevational view in the axial direction of the stud bolt, and FIGS. 5 to 7 show the working procedure of the present invention. is a vertical sectional view, is a plan view,
FIGS. 8 and 9 are cross-sectional views showing main reinforcement joints according to the conventional method. W...Underground continuous wall, S...Structure, 1...Main reinforcement,
2...Reinforcing bar, 3...Stud bolt, 3a...Head, 4...Concrete, 5...Base plate, 6...U bolt, 7...Main reinforcement, 8...Clamp.

Claims (1)

[Scope of Claims] 1. Main reinforcing bars that are buried in the underground continuous wall that has been constructed in advance, and reinforcing bars that are placed in the post-drilled frame that is constructed after excavating the ground surrounded by the underground continuous wall. In this method, stud bolts are connected to the main reinforcement placed on the skeleton side of the underground continuous wall with stud bolts facing the skeleton side, and these stud bolts are embedded in concrete. After excavating the ground, the concrete is removed to expose the stud bolt heads, and the reinforcing bars for the frame are welded onto the heads of the stud bolts to connect both reinforcing bars. and the method of joining it with the post-casting frame. 2. The underground continuous wall according to claim 1, wherein the base of the stud bolt is joined in advance to the outer periphery of a base plate or clamp, and the base plate or clamp is attached to the main reinforcement so that the stud bolt is connected to the main reinforcement. and the method of joining it with the post-casting frame.