JPS62268416A - Construction work of underground continuous wall coupler - Google Patents

Abstract

PURPOSE:To make the operations of construction work easier by a method in which plates for preventing the leak of concrete are provided projectionally from both ends of a partition plate on the end of a trench for constructing an element, round pipes are inserted into the space between the plates and reinforcing bars, and gravel is packed into the trench and concrete is placed. CONSTITUTION:Plates 4 for preventing the leak of concrete are provided projectionally from both ends of a partition plate 2 on the end of a trench 1 for constructing the preceding element of an underground continuous wall and extended to the ends of the reinforcing bars 3 of the preceding element along the side wall of the trench 1. Round pipes 5 with nozzles are inserted into the spaces between the plates 4 and the bar 3. Hollow boxes 9 are set between guides 8 provided to a coupler plate 7 inside the bars 3, gravel 4 is packed into the remaining space in the trench 1, and concrete 15 for the preceding element is placed. A trench for constructing the next stage element is excavated, the gravel 4 between the bars 3 is removed out, and the pipes 5 are pulled out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of constructing an underground continuous wall joint.

(Prior art) Figure 8 shows the construction state of a conventional underground wall joint, in which the preceding element reinforcing bars ( The 'ramp part of c) was once filled with gravel (d) t-, and the gravel (d+) was removed when excavating the groove for collecting the trailing element s.

In the figure, (1) is a leak prevention plate that extends from the end of the partition plate (b) along the inner surface of the slot (α).

A method has also been proposed in which an elongated hook body or tube is inserted between the reinforcing bar (c) and the side surface of the slot.

In addition, a 7-ton bag made of elastic airtight material is installed on both ends of the partition plate (BL) and filled with mortar expanded by enclosing pressure fluid, eliminating the need for gravel to prevent concrete from leaking. A method for acclimating has also been proposed.

(Problems to be Solved by the Invention) However, in the first method shown in FIG. It may be unreliable depending on the soil type and soil quality.

In addition, the second method, which uses a long and narrow hook body or tube, has difficulties in connecting the upper and lower joints, making it difficult to pull out due to concrete leakage and poor excavation accuracy. There are construction problems such as damage.

Furthermore, in the third method of using bags, etc., when the side wall of a large groove collapses, the bag cannot deform to follow the collapse, making it impossible to prevent leakage of concrete. It cannot be inserted, making construction difficult.

(Means for solving the problems) The present invention aims to solve these problems,
At both ends of the partition plate installed at the end of the trench for constructing an element of an underground continuous wall, concrete leakage prevention plates are installed that extend along the side wall surface of the trench to the tip of the reinforcing steel of the element that protrudes from the partition plate. After inserting a removable rod between the leakage prevention plate and the reinforcing steel, and filling the groove with gravel, pour concrete for the element, and then connect it to the element. After excavating a trench for constructing the element and removing the gravel between the reinforcing bars, the light and soap metal is pulled out.The purpose of this is to construct the joint part of the underground continuous wall. The object of the present invention is to provide a crabbing method that is simple and accurate.

(Function) As described above, in the present invention, an element protrudes from the partition plates of the concrete leakage prevention plate and the partition plates along both side wall surfaces of the groove from both ends of the partition plate at the end of the groove for constructing an element of an underground continuous wall. Reinforcing bar end I/c
After inserting a removable round pipe between the reinforcing bar and the leakage prevention plate, the remaining gap in the groove was filled with gravel, and sand was added to the area where it was previously difficult to remove gravel. There is no need to fill it.

Next, after pouring concrete for the leading element, a trench for constructing the trailing element is excavated, and at this time, the gravel between the reinforcing bars is removed and the round pipe is pulled out, making it unnecessary to confirm that the gravel has been removed. Next, reinforcing steel for the trailing element and concrete pouring will be carried out.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In Figure 1, (1) is the trench for constructing the preliminary element of the underground continuous wall, and the partition plate (2) installed at the end of the trench
) of the preceding element, which protrudes from the partition plate (2) along the side wall surface of the slot (1).
Concrete leakage prevention plate (41
'eProtrude the leakage prevention plate (4) and the reinforcing steel (
3), fully insert a plurality of round pipes (5) having injection nozzles near their lower ends. (6) in the figure is the same pipe (5)
This is a water injection hose installed in the

A guide (8) arranged inside the opposing reinforcing bars (3) and in the center of the partition plate (2) and connected to the FC joint plate (7) by a shaped steel or a flat steel. Install the hollow box (9) between the guides (8). (See Figure 7A) Figures 2 to 4 show details of the hollow box (9), in which a water injection hose OCj is arranged vertically in the center of the hollow part, and a horizontal line connected to the lower end of the hose An injection nozzle α2 branches out from the branch pipe αυ. Further, on the outer peripheral surface of the hollow box (91), a guide shoe α3 configured as a protruding strip that slidably contacts the partition plate (2) and the guide (8) is arranged in the vertical direction.

Note that the guide shoe may be made of flat steel, shaped steel, bar steel, etc., and does not need to be installed over the entire length of the hollow box (9) in the vertical direction.

In addition, the guide (8) is also installed with an appropriate gap in the vertical direction, so that the conc IJ of the following element
- It is possible to prevent defective turning of the parts.

After installing the round pipe (5) and the hollow box αOj, gravel α,0 is filled into the gap left in the slot (1). After filling with gravel α4), or at the same time, the entire concrete ha51 of the preceding element is poured. (1st
(See Figure and Figure 7B) After that, the round pipe (5) and the hollow box (9)
By spraying clean water through the water injection hose (6i (101) and the spray nozzle located near the lower end of the hose, the concrete that has entered the groove from the lower end of the preceding element side is cleaned.

At this time, the water jetted from the injection nozzle CI of the hollow box (9) is transmitted to the guide shoe 03) and the partition plate (2).
), the partition plate can be washed.

In addition, the water sprayed from Kuno 9 Eve has a leak prevention plate (
4) Clean the surfaces and the gaps between the reinforcing bars (3) with gold slurry.

Next, a trench hole for constructing the trailing element is excavated, and at this time, gravel (14i) between the reinforcing bars (3) in the trench hole (1) is removed (see Figure 7C). After the 7th slime treatment, the 9th rib (5) and the hollow box (2) are completely pulled out (see Figure 7D).Then, after the secondary slime treatment, the reinforcing bar cage σ61 of the trailing element is erected. (See Fig. 7E) Concrete α force of the trailing element is poured to complete the construction of the joint portion of both elements. (See Fig. 7F) In this way, according to the method of the above embodiment, conventional gravel Between the reinforcing bar (3) of the preceding element, which was difficult to remove, and the leakage prevention plate (4) along the side wall surface of the slot (1), and the opposing reinforcing bar (3) in front of the partition plate (2). After installing round pipe (5) and hollow box (9) between them, gravel α, i)
This makes the gravel removal work easier.

In addition, by supplying clean water through the round pipe (5) and the hollow box (9) and injecting it from near the lower end, it is possible to clean the concrete that has come around from the lower end of the preceding element, and also to clean the concrete that has come around from the lower end of the preceding element. 2)
, the reinforcing bars (3) can be cleaned.

Furthermore, when excavating the groove hole (1') for the succeeding element,
After removing all the gravel 04) between the reinforcing bars (3)+3+,
Since the hollow box aω and the round pipe (5) are pulled out, there is no need to confirm whether the gravel has been removed.

Note that the round pipe (5) is in line contact with the reinforcing bar (3) and the leakage prevention plate (4) at surface 1fc, but the round pipe (5)
By rotating it fully, you can cut the edges and easily pull it out.

FIG. 5 shows another embodiment of the present invention, in which the partition plate (2
) f' Cleaning guide α8) 08) is fully installed on both sides of the joint plate (7), and cleaning Confirm gravel removal.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

When removing gravel using a wide general-use packet, use the protective plate a'u shown in Figure 6.
(3) to prevent damage to the reinforcing bars (3).

In the figure, (a) is a cleaning hose, and Qυ is a packet for digging the trailing element. In the map, parts equivalent to those in the above embodiment are given the same reference numerals.

(Effects of the Invention) As described above, in the present invention, the tip of the reinforcing bar of the element protrudes from both ends of the partition plate at the end of the trench for constructing an element of an underground continuous wall, along the side wall surface of the trench. Concrete leakage prevention plate 2 that extends to
A round pipe is inserted between the prevention plate and the reinforcing steel, and then the groove is filled with gravel,
In this way, the above-mentioned reinforcing steel and concrete leakage, which was difficult to remove gravel in the past! : Since the round 7g eve is inserted in advance without loading gravel between the t1 prevention plates, the gravel removal work is facilitated.

Furthermore, when excavating the trench for the subsequent enment, by removing the gravel between the reinforcing bars and then pulling out the nine pipes, there is no need to confirm that the gravel has been removed, which simplifies construction. It is something that can be used.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing the implementation status of one embodiment of the method for constructing an underground continuous wall joint according to the present invention, FIG. 2 is a plan view of a hollow box, FIG. 3 is a front view thereof, and FIG. The figure is a perspective view, FIGS. 5 and 6 are cross-sectional plan views showing other embodiments of the method of the present invention, and FIGS. 7A to 7F are steps of the method of the present invention. FIG. 8 is a cross-sectional plan view showing the implementation of the conventional method. (1)...Slot hole, (2)...Partition plate,
(3)...Reinforcement bar (4)...Concrete leakage prevention plate (5)...Round pipe, (6)...Washing hole (9)...Hollow box, ←Q... Cleaning hose 0...gravel

Claims (4)

[Claims] (1) Concrete leakage prevention plates extending from both ends of the partition plate installed at the end of the trench for constructing an underground continuous wall element to the tip of the reinforcing steel of the element that protrudes from the partition plate along the side wall surface of the trench. A removable round pipe is inserted between the leakage prevention plate and the reinforcing steel, and after filling the groove with gravel, concrete for the element is poured, and then the element is poured with concrete. A method for constructing an underground continuous wall joint portion, characterized in that the round pipe is pulled out after excavating a trench for constructing the next element to be connected and removing gravel between the reinforcing bars. (2) together with the round pipe, inserting a hollow box in contact with the partition plate between the reinforcing bars protruding from the partition plate, filling the groove with gravel, and then pouring concrete for the element; The method for constructing a diaphragm wall joint according to claim 1, wherein clean water is then injected into the trench via the round pipe and the hollow box. (3) The underground continuous wall joint section according to claim 1, wherein a joint cleaning machine is moved up and down along a guide provided on the partition plate, and clean water is injected into the groove from the cleaning machine. construction method. (4) The method for constructing a diaphragm wall joint as set forth in claim 1, wherein a protective plate for the reinforcing bars is provided protruding from the front surface between the reinforcing bars that protrude from the partition plate.