JP2002061172A - Method for constructing underground continuous wall and the underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing an underground continuous wall for causing no dislocation of core materials even if a soil mortar is placed, and the underground continuous wall. SOLUTION: After the guide core material 7a is fixed at its lower end to the bottom of a groove 5 with a foot protection concrete 19, the core materials 7b, 7c are built therein to be fixed with spacers 13a, 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing an underground continuous wall in which a core material is erected in advance into a trench for forming an underground continuous wall excavated by an excavator, and soil cement is poured into the trench. It is related to the underground continuous wall.

[0002]

2. Description of the Related Art Conventionally, soil cement underground continuous walls have been constructed as follows. First, a trench for forming an underground continuous wall is excavated by an excavator, and excavated soil is collected on the ground and processed by a treatment plant. A predetermined amount of the processed excavated soil, cement, water, and the like are blended and kneaded to produce soil cement, and the soil cement is first injected into the groove using a tremy tube. A core material such as H steel is built into the groove using a mounting jig installed at the upper end of the groove.

[0003] Alternatively, there is also a method of constructing an underground continuous wall of a core material advance type in which a core material is erected in the trench after completion of excavation of the trench, and then soil cement is poured.

[0004]

However, in the method of constructing an underground continuous wall of the type following the core material, the hardening of the soil cement placed in the excavation groove progresses, so that the work of embedding the core material becomes difficult. It is difficult to obtain the built-in accuracy. Therefore, it is also possible to mix a delay material that delays the setting of the soil cement into the soil cement, but since the delay material is expensive,
There are drawbacks that the construction cost is high and quality control for realizing a predetermined strength is difficult.

[0005] In the method of constructing the underground continuous wall of the core material advance type
Since the embedding of the core material precedes and can be performed without being restricted by the setting time of the soil cement, it is excellent in workability and economy. However, there is a problem that the built-in core material is pushed and moved by the driving pressure of the soil mortar, causing a displacement, and it is difficult to ensure quality and accuracy.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method of constructing an underground continuous wall which does not cause displacement of a core material even when a soil mortar is cast. To provide underground continuous walls.

[0007]

A first aspect of the present invention for solving the above-mentioned problems is a step of excavating the ground to form a groove, and a step of embedding a plurality of core members inside the groove to form each of the cores. A method for constructing an underground continuous wall, comprising: a step of integrating a core material; and a step of pouring soil cement into the groove.

In the first invention, a plurality of core members are individually erected inside the groove, fixed and integrated. In this way, since the core material is integrated, it is possible to prevent displacement of the core material even when the soil cement is cast.

[0009] The second invention is a step of excavating the ground to form a groove, a step of embedding a first core material so as to reach the bottom of the groove substantially at the center of the groove, and a step of digging the bottom of the groove. Fixing the first core material to the ground, fixing the first core material to the first core material, inserting another core material around the first core material with a spacer interposed therebetween, and installing soil cement in the groove. And a step of casting the underground continuous wall.

In the second invention, a first core is erected at the center of the inside of the groove, and a plurality of cores are erected around the first core with a spacer interposed therebetween. For this reason, the position of each core material is fixed, and even if the soil cement is cast, the displacement of the core material can be prevented.

According to a third aspect of the present invention, a step of excavating the ground to form a groove, a step of providing a wire fixed at the bottom of the groove outside the groove, and a step of forming a plurality of core members inside the groove Erecting the wire, hooking the wire on both outer cores of the plurality of cores, and tensioning the wire to integrate the plurality of cores, and soil cement in the groove. And a step of casting the underground continuous wall.

In the third invention, after fixing the wire to the bottom of the groove, a plurality of cores are erected, and the wires are hooked and tensioned on both outer cores, thereby tightening the plurality of cores. Integrate. As described above, since the core material is integrated, displacement of the core material can be prevented even when the soil cement is cast.

According to a fourth aspect of the present invention, a step of excavating the ground to form a groove, a step of embedding a plurality of cores in the groove, and a step of forming a groove in the bottom of both outer cores of the plurality of cores. A step of integrating each of the plurality of core members by hooking each wire on a core member at a central portion and tensioning each of the wires, and placing a soil cement into the groove. And a step of constructing an underground continuous wall.

According to the fourth aspect of the present invention, a plurality of core members including both outer core members each having a wire at the bottom are erected inside the groove, and each wire is hooked on the central core member and tensioned. Tighten to integrate multiple cores. As described above, since the core material is integrated, displacement of the core material can be prevented even when the soil cement is cast.

A fifth aspect of the present invention provides a step of excavating the ground to form a groove, a step of embedding a plurality of cores in the groove, and drawing a wire to both outer cores of the plurality of cores. A method of constructing an underground continuous wall, comprising: a step of integrating the plurality of core members by hanging and tensioning the wire, and a step of placing soil cement in the groove. is there.

In the fifth invention, a plurality of core members including core members on both outer sides through which a wire is passed through the bottom are buried inside the groove,
A plurality of cores are integrated by hooking the wires on the outer cores and tightening them. As described above, since the core material is integrated, displacement of the core material can be prevented even when the soil cement is cast.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 6 relate to the first embodiment, FIGS. 1 to 4 show a construction procedure of an underground continuous wall of a core material advance type, and FIG. 5 is a longitudinal sectional view showing a state of embedding of a core material. FIG. 6 is a plan view thereof. As shown in FIG. 1, the ground 3 is excavated by the excavator 1 to form a groove 5 for forming an underground continuous wall as shown in FIG. The excavated soil is collected on the ground, processed in a treatment plant, and a predetermined amount of the processed excavated soil, cement, water and the like are mixed and kneaded to produce soil cement.

As shown in FIGS. 3 and 4, a jig 11 is installed at the upper end of the groove 5 and the core members 7 such as H-section steels are suspended one by one by the crane 9 and built into the groove 5. Put in.

As shown in FIGS. 5 and 6, the guide core 7a
Is provided with a spike 17 at the tip and a spacer 13a slightly below the center. The spacer 13a is a steel frame. The guide core 7a is built by the crane 9. At this time, the spike 17 penetrates into the bottom of the groove 5, and the guide core 7a is fixed to some extent. Next, the core material 7b is erected outside the spacer 13a. The core material 7c with the spacer 13b attached is erected outside the core material 7b. The tremy tube 15 is inserted into the spacer 13a and the spacer 13b, the concrete 19 is poured through the tremy tube 15, and the lower end of the guide core 7a is fixed.

Next, soil cement is cast into the groove 5 using the tremy tube 15. At this time, the guide core 7a
Are fixed to the bottom of the groove 5 by the consolidation concrete 19, and the spacers 13a, 13c are provided on the guide core 7a and the core 7c.
Since b is mounted, displacement of the core members 7a, 7b, 7c is prevented even when the soil cement is cast.

FIGS. 7 and 8 relate to the second embodiment. FIG. 7 is a longitudinal sectional view showing the state of embedding the core material.
Is a plan view thereof. As shown in FIGS. 7 and 8, an anchor hardware 33 having the wire 21 mounted therein is buried in the excavated groove 5, and a concrete 29 is laid. Core material 27
a, 27c are steel frame-like spacers 23a,
23b. Further, the core material 27c is provided with a guide 31 through which the wire 21 passes.

A core material 27a having a spacer 23a mounted in the center of the groove 5, a core material 27b outside the spacer 23a,
Core 27 with spacer 23b attached to the outside of core 27b
Build c. At this time, the wire 21 is passed through the guide 31 of the core material 27c, and the wire 21 is tightened and tightened at the upper portion of the core material along the core material 27c, thereby integrating the entire core material.

Next, the tremy tube 25 is inserted into the spacer 23a and the spacer 23b, and soil cement is poured into the groove 5 using the tremy tube 25. At this time, since the entire core material is tied by the wire 21 fixed to the bottom of the groove 5 by the consolidation concrete 29, the displacement of the core materials 27a, 27b, 27c is prevented even when the soil cement is cast. .

FIGS. 9 and 10 relate to the third embodiment. FIG. 9 is a longitudinal sectional view showing a state of embedding a core material, and FIG. 10 is a plan view thereof. As shown in FIGS. 9 and 10,
The core material 47c has a wire 41 attached to a lower end portion, and has a steel frame-shaped spacer 43b below. The core material 47a is provided with a guide 51 for passing the wire 41, and has a steel frame-shaped spacer 43a below.

A core material 47c to which the spacer 43b is attached is erected in the excavated groove 5. Inside the spacer 43b,
The core material 47b is built. The core material 47a to which the spacer 43a is attached is erected between the two core materials 47b. On this occasion,
The wire 41 is passed through the guide 51 provided on the core material 47a, and the wire 41 is tightened and tightened at the upper portion of the core material along the core material 47a to integrate the entire core material.

Next, the tremy tube 45 is inserted into the spacer 43a and the spacer 43b, and soil cement is poured into the groove 5 using the tremy tube 45. At this time, since the entire core is tied by the wire 41 attached to the core 47c, even if the soil cement is cast, the cores 47a,
7b and 47c are prevented from being displaced.

FIGS. 11 and 12 relate to the fourth embodiment. FIG. 11 is a longitudinal sectional view showing a state of embedding a core material, and FIG. 12 is a plan view thereof. As shown in FIGS. 11 and 12, the core 67c is provided at its lower end with a guide 71 for passing the wire 61, and has a steel frame-shaped spacer 63b below. The core material 67a is provided with a steel frame-shaped spacer 63a downward.
Having.

The core 67c is erected in the excavated groove 5. A wire 61 is attached to a guide 71 provided on two core members 67c.
Pass through. Next, the spacer 63b attached to the core 67c
The core material 67b is erected inside the. The core 67a with the spacer 63a mounted is erected between the two cores 67b.
Then, the wire 61 is tensioned at the upper portion of the core material along the core material 67c to be tied, thereby integrating the entire core material.

Next, the tremy tube 65 is inserted into the spacer 63a and the spacer 63b, and soil cement is poured into the groove 5 using the tremy tube 65. At this time, since the entire core is tightly bound by the wire 61 passing through the guide 71 at the lower end of the core 67c, displacement of the cores 67a, 67b, 67c is prevented even when the soil cement is cast. .

In each embodiment, the number of core members is not limited to the illustrated number. In addition, although the spacers are attached to the central part and the outer cores, the spacers may be attached to other cores to fix the positional relationship of the cores.

[0031]

As described above, according to the present invention, it is possible to provide a method for constructing an underground continuous wall which does not cause displacement of the core material even when a soil mortar is cast, and an underground continuous wall.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a construction procedure of an underground continuous wall of a core material advanced type.

FIG. 2 is an explanatory view of a construction procedure of an underground continuous wall of a core material advanced type.

FIG. 3 is an explanatory view of a construction procedure of an underground continuous wall of a core material advanced type.

FIG. 4 is an explanatory diagram of a construction procedure of a core material advanced type underground continuous wall.

FIG. 5 is an elevational sectional view of a core material built-in situation;

FIG. 6 is a plan view of a core material embedding state.

FIG. 7 is an elevational sectional view of a core material embedding state.

FIG. 8 is a plan view of a core material embedding state.

FIG. 9 is an elevational sectional view showing a state in which a core material is embedded.

FIG. 10 is a plan view of a core material embedding state.

FIG. 11 is an elevational sectional view of a core material embedding state.

FIG. 12 is a plan view of a core material embedding state.

[Explanation of symbols]

3 Excavator 5 Groove 7, 7b, 7c, 27a, 27b, 27c, 47a, 4
7b, 47c, 67a, 67b, 67c ... Core 7a ... Guide core 13a, 13b, 23a, 23b, 43a, 43b, 6
3a, 63b ... spacer 15, 25, 45, 65 ... Ptolemy tube 17 ... spikes 19, 29 ... reinforced concrete 21, 41, 61 ... wires 31, 51, 71 ... …… Guide 33 ……… Anchor hardware

 ──────────────────────────────────────────────────の Continued on the front page (71) Applicant 391000508 Oyone Motoko Industrial Co., Ltd. 1-6, Shioda-cho, Kochi City, Kochi Prefecture (72) Inventor Yutaka Kotaki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima (72) Inventor Toshihiko Murata 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Corporation (72) Inventor Shiro Kusanagi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima (72) Inventor Toshimi Moriguchi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Corporation (72) Inventor Naoki Kamiura 8-21-1, Ginza, Chuo-ku, Tokyo Stock Association (72) Inventor Yoshifumi Fujii 8-21-1, Ginza, Chuo-ku, Tokyo, Japan Incorporated Company (72) Inventor Junji Hori 8-2-1, Ginza, Chuo-ku, Tokyo, Japan Company (72) Inventor Shinichiro Kosai 8-21-1, Ginza, Chuo-ku, Tokyo Tokyo, Japan Takenaka Civil Engineering Co., Ltd. 2D049 FE08 GB01 GC11 GD01 GE03

Claims (12)

[Claims] A step of excavating the ground to form a groove; a step of embedding a plurality of core members inside the groove to integrate the respective core members; and pouring a soil cement into the groove. A method for constructing an underground continuous wall, comprising: 2. a step of excavating the ground to form a groove; a step of embedding a first core material at a substantially central portion of the groove so as to reach a bottom of the groove; and a periphery of the first core material. A step of embedding another core material with a spacer interposed therebetween, and a step of pouring soil cement into the groove. 3. The method according to claim 2, wherein a spike is provided at a bottom of the first core material, and the spike penetrates into a bottom of the groove. 4. The construction of an underground continuous wall according to claim 2, wherein after the first core material and the other core material are erected, concrete is poured into the bottom of the groove. Method. 5. A step of excavating the ground to form a groove, a step of providing a wire fixed at the bottom of the groove outside the groove, and a step of embedding a plurality of cores inside the groove. A step of hooking the wires on both outer cores of the plurality of cores and tensioning the wires to integrate the plurality of cores; and placing a soil cement into the groove. A method for constructing an underground continuous wall, comprising: 6. The method according to claim 5, wherein the wire is attached to an anchor hardware, and the anchor hardware is buried in the bottom of the groove and fixed by reinforced concrete. . 7. The method according to claim 5, wherein a spacer is provided on a predetermined core of the plurality of cores. 8. A step of excavating the ground to form a groove, a step of embedding a plurality of cores in the groove, and a wire at the bottom of both outer cores of the plurality of cores. Provided, a step of integrating each of the plurality of core materials by hooking each wire on a core material at a central portion and tensioning each of the wires, and a process of casting soil cement into the groove, A method for constructing an underground continuous wall, comprising: 9. The method according to claim 8, wherein a spacer is provided on a predetermined core of the plurality of cores. 10. A step of excavating the ground to form a groove, a step of embedding a plurality of cores in the groove, and hooking a wire on cores on both outer sides of the plurality of cores, A method for constructing an underground continuous wall, comprising: a step of integrating the plurality of core members by tensioning a wire; and a step of casting soil cement into the groove. 11. The method according to claim 10, wherein a spacer is provided on a predetermined core of the plurality of cores. 12. An underground continuous wall constructed by the underground continuous wall construction method according to any one of claims 1 to 11.