JPS642728B2 - - Google Patents

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 by various ground conditions, construction conditions, etc. Therefore, the wall must be composed of multiple unit walls, and there is no space between each adjacent unit wall. A joint occurs.

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 the slime caused by muddy water that has accumulated in the recesses of the partition plate, and as a result, the slime As a result, there was a drawback that the unit walls could not be reliably integrated with each other.

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 spacing between their outer edges 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. A partition mesh board having a large number of meshes that does not allow the aggregate to pass through these supporting rods is sequentially wound to form a continuous uneven part, and reinforcing bars are attached to the partition member. 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 and installed in a pre-formed and excavated leading slot, thereby dividing the leading slot into a first space in which the reinforcing bar cage is arranged and a second space in which the joint portion is arranged. Next, 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 form a space between the inner plates. At the same time as inserting and installing, a support member is installed in the second space,
Next, 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 suction member is inserted between the second temporary partition plate and the partition mesh plate in the second space. was inserted, and high-pressure water was jetted from the jetting member toward the partition mesh plate, thereby scattering the slime adhering to the partition mesh plate to the suction member side, and the slime was sucked and removed by the suction member. After that, the ejection member is removed, the first temporary partition plate is removed, and concrete is cast and hardened in the first space to construct a leading unit wall, and then a trailing groove hole including the second space is constructed. After excavating, an assembly similar to the above is inserted into the trailing groove, the second temporary partition plate is removed, and concrete is poured into the first space of the trailing groove and allowed to harden. A method of joining an underground continuous wall characterized by constructing a trailing unit wall.

An embodiment shown in the drawings will be described below.

As shown in FIGS. 1 and 2, an assembly 1 used in the construction method of the present invention includes partition members 2, which are arranged at intervals on the same vertical plane.
A pair of inner plates 4, 4 are fixed to the inner edges of the pair of outer plates 3, 3 facing each other so as to be perpendicular to each other. The inner plates 4, 4 are bent at their inner ends, 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, thereby forming continuous uneven portions 9 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.

The inner plate 4 has a large number of vertical reinforcing bars 10 and horizontal reinforcing bars 1.
1 and the reinforcing bar cage 12 and the joint reinforcing bar 1
3 are fixed laterally, the reinforcing bar cage 12 is located on one side of the outer plate 3, and the joint portion 13a of the joint reinforcing bar 13 is located on the other side. Next, an explanation will be given of an underground continuous wall joining method using the above-mentioned assembly.

First, as shown in FIGS. 1 and 2, a preliminary trench hole 14 is excavated in the ground E using an excavator, and at this time, the trench hole 14 is filled with muddy water as in the conventional method.
Prevent wall collapse.

Next, the assembly 1 is inserted into the slot 14, thereby converting the slot 14 into the first space where the reinforcing bar cage 12 is placed.
It is divided into S ₁ and a second space S ₂ in which the joint portion 13a of the joint reinforcing bar 13 is arranged. Then, a pair of first and second temporary partition plates 18a and 18b are inserted and installed between the inner plates 4 and 4, and partitioned by the inner plates 4 and 4 and the first and second temporary partition plates 18a and 18b. It forms a box-like space. First and second temporary partition plates 18a,
Concave engaging portions 17 are formed at both end portions of 18b, and upon insertion, the engaging portions 17 and the engaging portions 5 of the inner plate 4 are engaged. A protective fence 15 is installed in the second space _S2 to cover the joint portion 13a, and a locking pipe 16 is installed 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 20 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 20. 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. In addition to the cleaning work of the partition mesh plate 8, the cleaning work of the inner and outer plates 3, 4, etc. is also performed.

Next, as shown in FIG. 3, the ejection pipe 19 is removed, and concrete is poured into the first space _S1 and hardened to construct the preceding unit wall 21. When placing concrete, the lower end of the first temporary partition plate 18a is always positioned below the rising concrete head, and the temporary partition plate 18a is gradually raised and removed. Prevents slime from getting caught.

After constructing the preceding unit wall 21 as described above, the locking pipe 16 is removed and the second space S ₂
A trailing groove hole 22 including the following groove is excavated, and after the excavation is completed, the protective fence 15 is removed and an assembly similar to that described above (only the reinforcing bar cage 12 is shown) is inserted and installed into the trailing groove hole 22. 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 high pressure water from the ejection pipe 19 is applied to the partition mesh plate 8.
The slime adhering to the wall is scattered, and the slime and the cement paste that passed through the partition mesh plate 8 during the concrete placement of the preceding unit wall body 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 are removed, and the first space of the trailing slot 22 is opened.
Concrete is placed in S ₁ and hardened, and the trailing unit wall 23 is constructed. When pouring concrete,
The second temporary partition plate 18b is gradually raised and removed in the same way as the first temporary partition plate 18.

As described above, unit walls are constructed and joined in sequence,
Unit walls interlock with each other at joints to form underground continuous walls.

This invention is as described above, in which a partition mesh plate with continuous uneven parts formed between the inner plates of the partition member is provided, and high-pressure water is sprayed onto the partition mesh plate to adhere to the partition mesh plate before concrete is poured. The slime is scattered to the other side, and the slime is sucked in and removed by the suction pipe, so the partition mesh plate is completely cleaned.
In particular, no slime remains in the recess, and the unit walls mesh with each other 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 drawings]

The drawings show the construction procedure of the invented 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 state in which the trailing unit wall is constructed. Fifth
The figure is a longitudinal cross-sectional view of the same as above. 1... Assembly, 2... Partition member, 3... Outer plate, 4...
Inner plate, 5... Engagement part, 6... Support rod, 8... Partition mesh plate, 9... Uneven part, 12... Rebar cage, 13... Joint reinforcing bar, 13a... Joint part, 14... Leading slot, 15...
Protective fence, 16... Locking pipe, 17... Engaging portion, 18a... First temporary partition plate, 18b... Second temporary partition plate, 19... Ejection pipe, 20... Suction pipe, 21... Leading unit wall, 22... Trailing groove, 23... trailing unit wall.

Claims (1)

[Claims] 1. A pair of outer plates spaced apart on the same vertical plane and with the spacing between their outer edges approximately equal to the width of the slot, and a pair of outer plates that are perpendicular to the inner edges of both outer plates. A partition member is provided with a pair of inner plates that are fixed to face each other and have engaging portions formed at both ends thereof, and a large number of support rods are vertically connected between the inner plates. Partition mesh plates are fixed in a jagged 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 a continuous uneven portion.
A reinforcing bar cage and a joint member are each fixed horizontally to the partition member, 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. An assembly is formed in advance, and the assembly is inserted and installed in a pre-excavated slot, thereby dividing the pre-slot into a first space where the rebar cage is placed and a second space where the joint portion is placed.
space, and 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. At the same time, a support member is installed in the second space, and a high-pressure water jetting member is inserted between the first temporary partition plate and the partition mesh plate in the first space. , a suction member is inserted between the second temporary partition plate and the partition mesh plate in the second space, and high-pressure water is injected from the jetting member toward the partition mesh plate, thereby causing water to adhere to the partition mesh plate. After scattering the slime to the suction member side and sucking 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 into the first space and hardened. Then, after excavating a trailing groove containing the second space, an assembly similar to that described above is inserted and installed in the trailing groove, and the second temporary partition plate is installed. At the same time, the first trailing groove
A method of joining underground continuous walls characterized by constructing a trailing unit wall by pouring concrete into a space and allowing it to harden.