JPS6131521A - Joining method for underground continuous wall - Google Patents

Abstract

PURPOSE:To completely clean a partitioning mesh panel, by a method wherein water is injected from an injection pipe against a partitioning mesh panel mounted between the internal plates of a partition member to disperse slime adhered thereto toward the side opposite to the injection pipe, and the slime is sucked through a suction pipe for removal. CONSTITUTION:A partitioning mesh plate 8, bent in zigzag by support levers 6 to form projections and recesses, is located between internal plates 4 of a partition member 2 of an underground continuous wall. Prior to concreting, water is injected from an injection pipe 19 gradually lowered, slime adhered to the partitioning mesh plate 8 is dispersed toward the side opposite to the pipe, and the slime is sucked through a suction pipe 20 for removal. This enables complete cleaning of the partitioning mesh plate 8, and enables unit wall bodies to be engaged with each other after concrete is placed to reliably form the wall bodies integrally with each other.

Description

[Detailed description of the invention] The present invention relates to an underground continuous wall joining method.

The length of an underground continuous wall is limited due to various ground conditions, construction conditions, etc. Therefore, the wall must be composed of multiple unit walls, and the distance between each adjacent unit wall is limited. A joint occurs in the

Conventionally, the common method for joining unit walls is to install a partition plate at the joint and construct leading and trailing unit walls on both sides of this partition plate. There is a construction method in which continuous uneven parts are formed on the board so that the leading and trailing unit walls interlock at the joints. This construction method is intended to improve stress transmission between unit walls through the interlocking described above, but it is difficult to remove slime caused by muddy water that has accumulated in the recesses of the partition plates.
As a result, slime remains behind, resulting in the disadvantage that unit walls cannot be reliably integrated with each other and will not wear out.

An object of the present invention is to provide an underground continuous wall joining method that eliminates the drawbacks of the conventional method as described above and can completely remove slime adhering to partition plates. That is, the present invention includes a pair of outer plates arranged at intervals on the same vertical plane and having a distance between outer edges that is approximately equal to the width of the slot, and inner edges of both outer plates. A partition member having a pair of inner plates fixed to face each other perpendicularly to the edge and having engaging portions formed at both ends thereof, and a plurality of support rods arranged longitudinally between the inner plates. Partition mesh plates are arranged and fixed in a diagonal pattern over the support rods and have a large number of meshes that do not allow the aggregate to pass through, and are sequentially wound to form a continuous uneven part, and reinforcing bars are attached to the partition members. A cage and a joint member are each fixed horizontally, the reinforcing bar cage is located on one side of the outer plate, and the joint part of the joint member is located on the other side of the outer plate. The assembly is inserted into and installed in a pre-formed and excavated pre-slot hole, thereby dividing the pre-slot hole into a first space where the reinforcing bar cage is placed and a second space where the joint portion is placed. Then, a pair of first and second temporary partition plates each having an engaging portion formed at both end portions are engaged with the engaging portion of the inner plate to separate the inner plates. At the same time, a support member is installed in the second space, and then a high-pressure water spouting member is inserted between the first temporary partition plate and the partition mesh plate in the first space, and a support member is installed in the second space. A suction member is inserted between the second temporary partition plate and the partition mesh plate, and corner pressure water is injected from the jetting member toward the partition mesh plate to remove all the slime that has adhered to the partition mesh plate. After scattering the slime to the suction member side and inhaling and removing the slime with the suction member, the spouting member is removed, and then the first temporary partition plate is removed and concrete is poured and hardened in the first space. After constructing the leading unit wall and then excavating a trailing groove containing the second space, inserting and installing the same assembly as described above into the trailing groove, and removing the second temporary partition plate. In addition, there is provided a method for joining an underground continuous wall, characterized in that a trailing unit wall is constructed by pouring and hardening concrete in the first space of a trailing trench.

An embodiment shown in the drawings will be described below.

As shown in FIGS. 1 and 2, an assembly 1 used in the invention method comprises a partition member 2 - a pair of outer plates 3 spaced apart from each other on the same vertical plane. , 3, a pair of V-shaped inner plates 4, 4 are fixed to face each other perpendicularly to the inner edges of the outer plates 3, and the distance between the outer edges of the outer plates 3 is approximately equal to the width of the slot. Furthermore, both end portions of the inner plates 4, 4 are bent, thereby forming a convex engaging portion 5.

A large number of support rods 6 are arranged in a staggered manner in the vertical direction between the inner plates 4, 4, and these support rods 6 have male threads formed at both ends, and are connected to the inner plates 4, 4 by nuts 7. It is fixed to 4. A partition mesh plate 8 having a large number of meshes of a size that does not allow the aggregate to pass through is sequentially wound and fixed to the support rod 6.
In addition, continuous uneven portions 9 are formed on the partition mesh plate 8. In the illustrated example, the tips of the uneven portions 9 are sharp, but the support rods 6 may be arranged in a stepped manner, and the tips of the uneven portions 9 may be flat.

A reinforcing bar cage 12 and a joint reinforcing bar 13, which are made up of a large number of longitudinal reinforcing bars 10 and horizontal reinforcing bars 11 fixed to each other, are fixed to the inner plate 4 in a horizontal direction, and the reinforcing bar cage 12 is located on one side of the outer plate 3. However, the joint portion 13a of the joint reinforcing bar 13 is located on the other side.

Next, a method for joining underground continuous walls using the above-mentioned assembly will be explained.

First, as shown in Figures 1 and 2, a preliminary trench 14 is excavated in the ground E using an excavator, and at this time, the trench 14 is filled with muddy water in the same way as before to prevent the wall from collapsing. .

Next, the assembly 1 is inserted and installed in the slot 14, thereby dividing the slot 14 into the first space S1 where the reinforcing bar cage 12 is arranged and the second space S2 where the joint portion 13a of the joint reinforcing bar 13 is arranged.
It is divided into two parts. And between the inner plates 4, 4, a pair of first. Insert and install the second temporary partition plates 18a and 18b, and
and 1st. A box-shaped space is formed divided by the second temporary partition plates 18a and 18b. Concave engaging portions 17 are formed at both ends of the first and second temporary partition plates 18a and 18b, and when inserted, the engaging portions 17 and the engaging portions 5 of the inner plate 4 are engaged. let In addition, there is a protective fence 15f in the second space S2.
, to cover the joint portion 13a'i, and further install the locking pipe 16 to support the assembly 1.

Next, a high-pressure water ejection pipe 19 is inserted between the first temporary partition plate 18a and the partition mesh plate 8, and a suction pipe 2of: is inserted between the second temporary partition plate 18b and the partition mesh plate 8. While moving up and down, and rotating the tip, high-pressure water is injected from the tip toward the partition mesh plate 8, thereby scattering the slime due to muddy water adhering to the partition mesh plate 8 to the suction pipe 20 side. The slime is sucked in and removed through the suction pipe 2o. Clean water is used as the high-pressure water, and once it is confirmed that clean water is coming out of the suction pipe 20, the work is finished.

Further, in parallel with the cleaning work of the partition mesh plate 8, cleaning work of the inner and outer plates 3, 4, etc. is also performed.

Next, as shown in FIG. 3, the ejection pipe 19f is removed, and concrete is poured into the first space S1 and hardened to construct the preceding unit wall 21. When concrete is poured, the first temporary partition is The temporary housing cutting board 18a is gradually raised and removed while the lower end of the board 18a is always located below the rising concrete head, thereby preventing slime from being drawn in by concrete pouring.

After constructing the preceding unit wall 21 as described above, the locking pipe 16 is removed, the trailing groove hole 22 including the second space S2 is excavated, and after the excavation is completed, the anti-brittle fence 15 is removed and the trailing groove hole 22 is excavated. An assembly similar to the above (only the reinforcing bar cage 12 is shown) is inserted into the slot 22 and installed. Then, both the ejection pipe 19 and the suction pipe 20 are inserted between the second temporary partition plate 18b and the partition mesh plate 8, and the slime adhering to the partition mesh plate 8 is scattered by high pressure water from the ejection pipe 19. The slime and the cement paste that passed through the partition mesh plate 8 during concrete placement of the preceding unit wall 21 are sucked into the suction pipe 20 and removed. The amount of slime and cement paste at this time is extremely small, so such cleaning work does not necessarily have to be performed.

Next, as shown in FIGS. 4 and 5, the ejection pipe 19 and the suction pipe 20'lt are removed, and concrete is poured into the first space S1 of the trailing slot 22 and hardened to form the trailing unit wall 23. To construct. When pouring concrete, use the second temporary partition plate 18.
2) Gradually raise and remove as in the case of the first temporary partition plate 18.

As described above, the unit walls are constructed and joined one after another, and the unit walls are interlocked with each other at the joints to form an underground continuous wall.

This invention is as described above, in which a partition mesh plate having continuous uneven parts is provided between the inner plates of the partition member, and high-pressure water is sprayed onto the partition mesh plate to adhere the concrete before concrete is poured. Since the slime is scattered to the opposite side and removed by suction into the suction pipe, the partition mesh plate is completely cleaned, and no slime is left in the recesses, and the unit walls are mutually separated. They interlock and are reliably integrated, making it possible to construct an underground continuous wall with excellent water-stopping properties and stress transmission properties.

[Brief explanation of the drawing]

The drawings show the construction procedure of this invention construction method, Fig. 1 is a cross-sectional view showing the assembly installed in the preceding groove, Fig. 2 is a longitudinal sectional view of the same, and Fig. 3 is the preceding unit wall. FIG. 4 is a cross-sectional view showing the construction of the trailing unit wall, and FIG. 5 is a vertical cross-sectional view of the same.

Claims (1)

[Claims] 1. A pair of outer plates spaced apart on the same vertical plane, with the spacing between their outer edges being approximately equal to the width of the slot, and perpendicular to the inner edges of both outer plates. a partition member having a pair of inner plates fixed to face each other so as to face each other and having engaging parts formed at both ends thereof, and a large number of support rods extending longitudinally between the inner plates. Partition mesh plates are fixed in a zigzag arrangement and have a large number of meshes that do not allow aggregate to pass through these support rods, and are sequentially wound to form continuous uneven parts, and the partition members are fitted with reinforcing bar baskets and joints. An assembly is formed in advance, in which the reinforcing bar cage is positioned on one side of the outer plate, and the joint portion of the joint member is positioned on the other side of the outer plate. , the assembly is inserted and installed in the excavated preceding groove, thereby dividing the preceding groove into a first space where the reinforcing bar basket is placed and a second space where the joint portion is placed, and then both sides are separated. A pair of first and second temporary partition plates having engaging portions formed at their ends are inserted and installed between the inner plates by engaging the engaging portions with the engaging portions of the inner plates. At the same time, a support member is installed in the second space, and then a high-pressure water jetting member is inserted between the first temporary partition plate and the partition mesh plate in the first space, and a support member is installed in the second space. A suction member is inserted between the partition plate and the partition mesh plate, and high-pressure water is injected from the jetting member toward the partition mesh plate, thereby scattering the slime attached to the partition mesh plate toward the suction member side. After the slime is suctioned and removed by the suction member, the ejection member is removed;
Next, the first temporary partition plate is removed and concrete is cast and hardened in the first space to construct a preceding unit wall,
Next, after excavating a trailing groove containing the second space, an assembly similar to that described above is inserted and installed in the trailing groove, the second temporary partition plate is removed, and the trailing groove is opened. A method for joining an underground continuous wall, characterized by constructing a trailing unit wall by pouring and hardening concrete in a first space.