JPS5817919A - Method of constructing lateral reinforcement joint for underground continuous wall and its interlocking pipe device - Google Patents

Abstract

PURPOSE:To utilize the continuous wall as the wall body of a structure by a method wherein a reinforced cylinder is mounted between locking pipes at both sides of a trench, concrete is placed, while one of the locking pipes is removed, a reinforced cylinder is set up into the next trench and concrete is placed. CONSTITUTION:The reinforced cylinder 2 is installed between the interlocking pipes 1, 1' built at both end sections of the trench A, connecting joint sections 4, 4' are mounted to a lateral reinforcement 3, concrete is placed into the trench A, and a preceding continuous wall element 6 is formed while the next trench B is excavated. The interlocking pipe 1 contacting with the trench B side is detached and removed by means of a hydraulic jack 10, and moved to the other end section of the trench B. The reinforced cylinder 2' is mounted into the trench B, the connecting joint section 4' and the connecting joint section 4 projected from the preceding continuous wall element 6 are connected, concrete is placed into the trench B, and the next continuous wall element 6' is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal reinforcement joint construction method for underground continuous walls and an interlocking pipe device used in the construction method.

In the conventional underground continuous wall construction method, the horizontal reinforcements of adjacent continuous wall elements are discontinuous through interlocking pipes. For this reason, various proposals have been made, such as arranging a special joint box. However, with these methods, construction becomes complicated and it is impossible to directly connect the horizontal reinforcements and make them continuous in a straight line.

In view of the above-mentioned problems, this invention provides a horizontal reinforcement joint construction method for underground continuous walls that has excellent construction efficiency and allows the horizontal reinforcements of each element to be directly connected and continuous using interlocking pipes, and an interlocking method used in the method. It is an object of the present invention to provide a pipe device to solve the above-mentioned problems.

The horizontal reinforcement joint construction method for an underground continuous wall according to the present invention will be explained below with reference to an illustrative embodiment.

■ After completing the excavation of the preceding trench A,
Interlocking pipes 1 and 11 are installed at both ends of the
(See Figure 1 C).

■ A reinforcing bar cage 2 is installed between the opening and the Tsukifugu pipes 1 and 11, and at that time, the same transverse bar 3 is installed at both ends of the horizontal bar 3 of the reinforcing bar cage 2.
Connection joint parts 4, 4 whose movement can be adjusted by sliding in the extending direction of the
1, and the connecting joints 4, 4' are held watertight in the hollow portions of the locking pipes 1, 1' (see Figure 1).

(2) Concrete 5 is poured into the preceding trench A to form the preceding continuous wall element 6, and a new trench B is excavated in the direction of continuous wall construction progress (see Fig. 1C).

(2) Pull out the locking pipe 1 that is in contact with the new trench B side and move it to the end of the trench B in the continuous wall construction direction. At this time, the locking pipe 1 is attached to the joint surface of the locking pipe 1 and the preceding continuous wall element 6.
A plurality of hydraulic jacks 7 are installed in advance, and the joint surface between the continuous wall element 6 and the locking pipe 1 can be easily separated (see Fig. 1C).
reference).

(2) In this state, the connecting joint portion 4 of the transverse reinforcement 3, which was held watertight in the locking pipe 1, protrudes from the preceding continuous wall element 6 (see FIG. 1C).

(2) A reinforcing bar basket 2+ similar to the reinforcing bar cage 2 is installed in the new trench B. Next, the connection joint part 4' of the reinforcing bar cage 21 and the connection joint part 4 are linearly connected, and the connection joint part 41 on the opposite side is held watertight in the relocated locking pipe 1 (first (See Figure C).

■ Concrete 51 is poured into such trench B to form the next continuous wall element 6'' (see Figure 1g).

■ Repeat this method and directly connect the horizontal bars of the reinforcing bar cage to build a completely continuous underground wall in the horizontal direction (see the first diagram).

The above is an outline of the transverse bar joint construction method according to the present invention, and next, the details of the transverse bar joint construction method, the interlocking pipe device used in the method, and its reinforcing bar cage will be explained with illustrations.

An engaging flange plate 8 is provided in the interlocking pipes 1, 1' and is fixed to the inner circumference of the pipe at a chord position and extends over the entire length of the pipe. This locking 7 flange plate 8 includes a support 7 flange 9 connected to the back side of the 7 flange plate 8 and the inner periphery of the pipe, and a support 7 flange 9 extending above and below the surface of the locking flange plate 8. A plurality of hydraulic jacks 10'' are fixed at predetermined intervals (see FIG. 2). In the extending direction of the hydraulic jack 10, an opening window 11 is provided which opens from inside the locking pipes 1, 1' toward the surface. A pressing attachment 12 of the hydraulic jack 10, which is provided with a water stop plate 121 that fits on the same circumferential surface as the base material of the locking pipes 1, 11, is attached to the opening window 11. The window 11 is completely closed. The force locking pipes 1 and 11 have surfaces on both sides of the pressing attachment 12.
An insertion groove 13 formed over the entire length of 11 is open. This insertion groove 1.6 is inserted into the locking pipe 1,1.
A water stop plate 14 is formed so as to penetrate from the two surface portions of the flange plate 8 to the rear surface portion of the engagement flange plate 8.

The connection joint parts 4 and 4' attached to both ends of the reinforcing bar cage 2 and the 2° horizontal reinforcement 6 are connected to a plurality of mounting rings 15 fitted to both ends of the horizontal reinforcement 3, respectively, and the mounting rings 15.
It consists of a plate 16 that is fixed to the plate 16 and is attached so as to be extendable or retractable in the direction in which the transverse reinforcement 6 protrudes, and a connecting joint 17 that is fixed to the end of this plate 16 (see FIGS. 3a and 3b). . Therefore, the horizontal length of the reinforcing bar cage 2.degree. 21 can be adjusted within a certain range, and distance errors in the spacing between the locking pipes 1 and 1' can be absorbed. As a result, the insertion groove 13 of the rocking pipe 1, 1+ and the engaging flange,
The connecting joint portions 4, 41 can be easily fitted into the plate 8. Also, at least the reinforcing bar cages 2, 2',
As long as the length in the horizontal direction can be adjusted, a pipe to which the connecting joint 17 is fixed may be disposed at the distal end of the horizontal reinforcement 6 in the extending direction, and both members may be connected by being wound with a spring 18. (See Figures 4a and b). The connection joint 17 is of the type A shown in FIG. 3A, in which a lip groove-shaped female metal fitting 19 is fixed to both ends of the connection joint parts 4, 4', and a female metal fitting 19 is fixed to one end. There is a type B shown in FIG. 4a in which a male metal fitting 20 is fixed to the other end. In the type A, the connecting joints 17 at both ends of the adjacent reinforcing bar baskets 2' are male metal fittings 20, and in the type B, only one type of reinforcing bar cages 2 and 21 can be used for connection. Further, as a joint for the connection joint 17, a round bar or a pipe-shaped male fitting is inserted into a pipe-shaped female fitting 19 (see Fig. 5a).

There is a type in which a plate or pipe-shaped male fitting 20 is inserted into a female fitting 19, which is made by cutting one side of a square pipe in the extending direction (see FIGS. 6a and 6b).

Using the above-mentioned device, in the state of construction method (2), the connection joint 17 of the reinforcing bar cage 2 is inserted into the insertion groove 16 of the locking pipe 1. The inserted connection joint 17 is engaged with the engagement flange plate 8 via a gap-maintaining steel box 21 (see FIG. 7). or,
A waterproof backing material 22 made of hard rubber is loaded over the entire length of the insertion groove 13 in the extending direction. For this reason, the poured concrete 5 does not enter the locking pipe 1 during the construction method (2). Said steel box 21
f'i, the hydraulic jack 1 that was removed during the construction method ①;
Locking pipe 1 retaining flange with 0 working time gap
(It is easy to separate the joint surface with the 4th connecting pipe 1.)
In the state shown in the construction method (2) above, the connection joint 17 is directly connected and fixed with concrete 51, and the underground continuous wall can be completely integrated in the horizontal direction (see Fig. 9).

An embodiment of the underground continuous wall transverse reinforcement joint construction method and its interlocking pipe device according to the present invention is as described above, and has the following excellent effects.

Because the horizontal reinforcing bars of the underground continuous wall were made to be continuous in the horizontal direction,
With sufficient reliability, diaphragm walls can be converted into walls of permanent structures.

Further, since the connecting joint portion is a hinge joint that can be freely moved, the continuous wall can be formed not only into a rectangular shape but also into a polygonal shape close to a circle. Furthermore, by using this construction method, it is possible to reduce construction costs and significantly shorten the construction period.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the transverse reinforcement joint interlocking pipe device for an underground continuous wall according to the present invention; Figures 3a and b
and Figures 4a and 4b are a plan view and a side view showing the reinforcing bar cage,
Figures 5a, b and 6a, b are front views showing modified examples of the connecting joint, Figure 7 is a cross-sectional view of an interlocking pipe with a reinforcing bar cage, and Figure 8 is an interlocking pipe. FIG. 9 is a cross-sectional view showing the state in which the jack of the locking pipe is activated, and FIG. 9 is a cross-sectional view showing the connecting joint in the continuous wall element. A...Advanced trench f, B...Trench, 1.1'...Rocking pipe, 2.2'...Rebar cage, 3...Horizontal reinforcement, 4
, 4'... Connection joint part, 5, 5'... Concrete, -
6. Preceding continuous wall element, 7. Suppressing jack, 8
・・Retention flange plate, 9・・Support flange, 10・・
Hydraulic jack, 11... Opening window, 12... Pressing attachment, 12'... Water stop plate, 16... Insertion groove, 14...
Water stop plate, 15... Mounting ring, 16... Plate. 17... Connection joint, 18... Spring, 19... Female fitting, 20... Male fitting, 21... Steel box, 22... Water stop backing. Patent applicant: Sumitomo Construction Co., Ltd. Figure 1 (h) Figure 2 Figure 7 4・4'21 3
[;'1 (G) (b) 6th [;'1 (b) Figure 8 2 Figure 9 7

Claims (2)

[Claims] (1) When installing a reinforcing bar cage between both interlocking pipes built at both ends of the preceding trench, a plurality of connection joints are provided at both ends of the horizontal bars that make up the reinforcing bar cage, and these connecting joints is held in both rocking pipes, concrete is poured to form a leading element, and a new trench is excavated next to the rocking pipe in the direction of continuous wall construction, and the leading continuous wall element of the rocking pipe is The locking pipe is separated from the preceding continuous wall element by actuating a plurality of suppressing jacks built into the contact surface in advance, and is moved to the end of the new trench in the construction direction. A similar reinforcing bar cage is installed, and at this time, the connection joint protruding from the preceding continuous wall element and this
``In addition to connecting the reinforcing bar cage joints in a straight line,
The connection joint on the opposite side was relocated. A horizontal reinforcement joint construction method for an underground continuous wall, which is characterized by constructing an underground continuous wall in which horizontal reinforcements are linearly connected by holding concrete in a rocking pipe and pouring concrete. (2) An engaging flange arranged in an arc with respect to the inner periphery is fixed to the inner periphery extending over the entire length of the interlocking pipe. A support flange connected to the inner peripheral part is fixed, and the surface part of the support flange has the above-mentioned rod.
・A predetermined number of jacks are fixed along the entire length of the king pipe, and in the extending direction of the jacks, an opening window opened in the locking pipe and a drive shaft of the jacks are fixed, and under normal conditions, this window is and a suppressing attachment formed by closing the locking/44
In the extending direction of both sides of the pressing attachment on one surface,
An interlocking pipe device characterized in that insertion grooves are formed that penetrate from the surface of the locking pipe to the back surface of the engagement 7 langes and allow the ends of the horizontal reinforcement of the reinforcing bar cage to be inserted therethrough.