JPH03221613A - Joining method for underground continuous wall and after-placing body - Google Patents

Abstract

PURPOSE:To facilitate the construction work by joining stud bolts to the main reinforcement of an underground continuous wall which is to be previously constructed, and after the ground has been excavated, by placing concrete so as to expose the head parts of the stud bolts, and thereto by weldedly fixing the reinforcement bars for an after-placing body. CONSTITUTION:On the body-side reinforcement bar of a main reinforcement 1 being arranged on the body side of an underground continuous wall W which is to be previously constructed, screw threads are formed. And a nut 3 is screwed in the threaded part, and on the side surface of the nut 3, a stud bolt 4 is welded so as to be directed toward the body side. Then, in such a condition that the stud bolt 4 has been embedded in concrete 5, an underground continuous wall W is constructed. After excavation of the ground, concrete 5 is placed so as to expose the head part 4a of the stud bolt 4, and the reinforcement bar for the after-placing body is weldedly fixed to the head part 4a by welding or the like for connecting both reinforcements.

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 FIG. 5, integration has been carried out by folding a part of the skeleton side of an underground continuous wall and then connecting both reinforcing bars with a mechanical joint such as a grip joint or screw joint.

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. Some parts become loose, and installation takes time.

There are problems such as the curing of reinforcing bar joints before pouring concrete, which is troublesome.

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, a nut is screwed onto a threaded main reinforcement arranged on the skeleton side of an underground continuous wall, and a stud port is welded to this nut toward the skeleton side. By welding reinforcing bars on the frame side to the stud bolts and connecting the main bars to the reinforcing bars, the fixed state of the jointed stud bolts to the main bars is ensured, and the problem of the method using wires is solved.

Underground continuous walls are constructed with stud bolts embedded in concrete. After excavating the ground, the concrete is partially polished to expose the heads of the stud bolts, and the reinforcing bars on the frame side are attached to the heads of the stud bolts. are welded to connect the main reinforcing bars to the reinforcing bars on the skeleton side.

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

This invention connects 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 ground excavation, with nuts 3 attached to the reinforcing bars L. This is a method of integrating the underground continuous wall W and the frame S by welding reinforcing bars 2 to the stud bolts 4 that have been joined in advance through the joints.

The main reinforcing bar 1 is a threaded steel bar or the like, which is threaded at least at the connection part with the reinforcing bar 2, as shown in FIG. 1-2, and a nut 3 is screwed into this threaded part.

The stud bolt 4 is welded to the side surface of the nut 3 so as to face the body S as shown in the figure.

With the stud bolts 4 connected toward the frame S, concrete 5 is poured to construct an underground continuous wall W as shown in FIG. 2.

After constructing the underground continuous wall W and excavating the ground inside thereof, the standport 4 is exposed by breaking only the head portion 4a of the stud bolt 4 in the concrete 5 as shown in FIG.

After folding the concrete 5, the head 4a of the stud bolt 4
Then, as shown in FIG. 5, the reinforcing bars 2 on the side of the building frame S are welded by stud welding or the like, and the two reinforcing bars 1.2 are connected as shown in FIG. 4.

After the reinforcing bars 2 are welded, the underground structure is constructed by arranging the main bars 6 of the post-casting frame S and pouring concrete around them.

(Effects of the Invention) This invention is as described above, and since the stud bolt is fixed to the main reinforcement by welding to a nut screwed into the threaded main reinforcement, the fixed state of the stud bolt is ensured. This prevents the fixed points from loosening during concrete pouring, and makes it easier to assemble the reinforcing bar cage.

In particular, the installation of reinforcing bars can be done by threading nuts and welding, so special skills are not required, and for the reasons mentioned above, assembly work can be completed in a short time, improving construction efficiency. .

[Brief explanation of drawings]

Figure 1-I and ■ are respectively a plan view and a vertical cross-sectional view showing an embodiment of the present invention, and Figures 2 to 4 are diagrams showing the working procedure of the present invention, and I is a vertical cross-sectional view, ■ 5 is a plan view, and FIG. 5 is a sectional view showing a conventional joint. W...Underground continuous wall, S...Structure, 1.
...Main bar, 2...Reinforcement bar, 3...
Nut, 4... Stud bolt, 4a...
...Head, 5...Concrete, 6...
・Main muscle. Figure 2 ■ ■ Figure ■ ■ Figure ■

Claims (1)

[Claims] (1) Connecting the main 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, in which a nut is screwed onto the threaded part of the main reinforcement that is placed on the frame side of the underground continuous wall and is threaded at least at the reinforcing bar position on the frame side. Stud bolts are welded to the sides facing toward the frame, and the stud bolts are embedded in concrete to construct an underground continuous wall. After excavating the ground, the concrete is scraped to expose the heads of the stud bolts. A method of joining an underground continuous wall and a post-casting skeleton by welding the reinforcing bars of the building frame onto the heads of stud bolts and connecting both reinforcing bars.