JP2003184075A - Soil cement column strip earth retaining wall and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil cement column strip earth retaining wall and its construction method with the high effect of thinness of a wall having good construction efficiency. <P>SOLUTION: Soil cement 2 is placed inside of a large number of excavation holes 1 formed so as to make a row and overlap the adjoining excavation holes and, at the same time, in the soil cement column strip earth retaining wall constructed by inserting H-shaped steels 3 in the soil cement 2 of all or selected excavation holes 1, the H-shaped steels 3 are eccentrically set to a diameter of each excavation hole 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a soil cement pillar pile retaining wall and a method for constructing the same.

[0002]

2. Description of the Related Art Conventionally, as a technique for thinning a soil cement pillar pile retaining wall for constructing a building up to the full site, as shown in FIG.
In some cases, a wide H-section steel Q having a small diameter was used alone, or as shown in FIG. 9B, a stress material R having a small cross section and a small hole diameter was used. It should be noted that the left side in both of the above figures shows a normally thick mountain retaining wall for comparison, which is thinned by dimensions q and r, respectively.

[0003]

However, among the above-mentioned conventional techniques, the one using the wide H-section steel Q of FIG. 8A has a difference of 1 from the conventional H-section steel. There was a problem that the wall thickness could be reduced to only about / 2 and the reduction effect could not be expected. Further, in the structure constructed by the stress material R shown in FIG. 8 (B) in which the hole diameter is reduced, for example, the wall width L1 constructed by the triaxial excavator becomes narrower than the wall width L2 produced by the conventional excavator, Not only the construction efficiency is poor, but there are also problems that such a reduced diameter multi-axis excavator is not widely used and the cost is high.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a soil cement pillar column retaining wall having a high thinning effect and good construction efficiency, and a construction method thereof. To provide.

[0005]

Means for Solving the Problems The soil cement column row retaining wall of the present invention is used for placing soil cement in a large number of holes formed in rows and so that adjacent ones overlap each other. In a soil cement pillar row retaining wall constructed by inserting stress material into soil cement of all or selected drill holes, the stress material is installed eccentrically with respect to the drill hole diameter. Further, the stress material is installed so as to be eccentric to the outside. further,
It is characterized in that the stress material is made of a steel material such as H-section steel.

In the method for constructing the soil cement column row retaining wall of the present invention, the soil cement is placed in a large number of drilled holes formed in rows and so that adjacent ones overlap each other. In the method of constructing a soil cement column row retaining wall constructed by inserting a stress material into the soil cement of the selected hole, the stress material is eccentrically inserted to the outside before the soil cement is hardened, and inserted. After hardening, the soil cement on the excavation side is removed to make a thin wall. Further, the stress material and the dummy steel material are detachably inserted in an integrated state, the soil cement on the excavating side is removed after the soil cement is hardened, and the dummy steel material is detached and removed. Further, it is characterized in that the dummy steel material is removed in a state where a part of the dummy steel material is separated and left on the excavation bottom. Still further, the invention is characterized in that a discarded steel material is integrally attached to the excavation side of the lower end portion of the stress material and is inserted into the soil cement. Furthermore, the stress material and the dummy steel material are detachably inserted in an integrated state, and the dummy steel material is pulled up and removed before the soil cement is hardened. Further, the invention is characterized in that the stress material is inserted while being guided by a ruler material, and the ruler material is pulled up and removed before the soil cement is hardened.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a hole, which is appropriately drilled by an excavator in the ground around the excavated portion in the construction site. Generally, the drilled hole 1 is drilled into a plurality of continuous holes by a multi-axis excavator. Further, the adjacent drilled holes 1 overlap each other and are drilled.

In the drill hole 1, soil cement prepared by mixing excavated soil and a solidifying material such as cement is placed. After hardening, the soil cement of this embodiment is removed by scraping the inner portion of the soil cement column, leaving the outer portion of the drilled hole diameter, thereby constructing a soil cement column 2 having a substantially semicircular cross section. It should be noted that the outer portion and the inner portion do not have to be perfect semicircles as shown in the drawing, and their boundaries fluctuate vertically depending on the target wall thickness.

In FIG. 1, reference numeral 3 denotes an H-shaped steel as a stress material, which is eccentrically inserted into the outer portion of the soil cement column 2 of the circular drilled hole 1. The stress material 3 is not necessarily installed in all the soil cement columns 2, but is installed in the soil cement columns 2 of the necessary drilling holes 1 within a range that does not impair the function as a mountain retaining wall. Good.

FIG. 2 illustrates a first embodiment of a method for constructing a soil cement column pile retaining wall. First, referring to FIG.
As shown in (1), a hole 4 is formed in the ground G, and H-section steel 6 as a stress material is inserted into soil cement 5 in which excavated soil and a solidifying material such as cement are mixed. In this case, H
The shaped steel 6 is eccentrically inserted outside the drilled hole diameter. When the soil cement 5 is hardened, as shown in FIG. 2 (B), the excavation side site is excavated, and the excavation side soil cement 5 is removed to remove the soil cement pillar having a semicircular cross section. 5'is formed. As described above, these soil cement columns 5'are continuously formed in an overlapped state, and as a result, an earth retaining wall is constructed. The same applies to the following examples.

FIG. 3 illustrates a second embodiment of the method for constructing the soil cement column pile retaining wall. As shown in FIG. 3 (A), an H-shaped steel 7 and a dummy steel material 8 are detachably integrated. It is inserted into the soil cement 9 in the converted state. In this case, the H-shaped steel 7 as the stress material is eccentrically inserted outside the drilled hole diameter. Once the soil cement 9 has hardened, see Figure 3.
As shown in (B), while excavating the site on the excavation side, the soil cement 9 on the excavation side is removed and removed, and the dummy steel material 8'exposed to the excavation portion is cut off and removed to have a cross section of approximately half. A circular soil cement column 9'is formed.

FIG. 4 shows a modified example of the second embodiment, in which the waste steel material 8 ″ is integrally attached to the excavation side of the lower end portion of the stress material 7 in the soil cement 9. When the soil cement 9 is inserted and hardened, the site on the excavation side is excavated as shown in FIG.
Will not be removed, but will remain inserted in the excavation bottom.

FIG. 5 illustrates a third embodiment of a method for constructing a soil cement column row retaining wall. As shown in FIG. 5 (A), an H-section steel 10 and a dummy H-section steel 11 are joined by a clip. Soil cement 13 integrated with 12
Insert inside. Before the soil cement 13 is hardened, the dummy H-section steel 11 is separated from the H-section steel 10, and the dummy H-section steel 11 is left with the H-section steel 10 left as shown in FIG. 5B. Pull up. Soil cement 1
Once 3 has hardened, the excavated side is scraped off and a soil cement column (not shown) is constructed.

FIG. 6 shows the integration of the H-section steel 10 and the dummy H-section steel 11 by the joining clip 12 and the mechanism for separating them, in which the clip body 12a of the joining clip 12 is formed in a U-shape. As shown in an enlarged view in FIG. 6 (B), the clip body 12a can be externally inserted into the joint side flange portions of both H-section steels 10 and 11 and can be rotated around the clip body 12a as shown in FIG. 6 (C). The arcuate locking portion 12b 'of the operating rod 12b attached to the above is pressed against the flange portion to be integrated. At the time of disconnection, a cord 12 'such as a piano wire connected to the operating rod 12b is pulled from the ground in the direction of the arrow to rotate the operating rod 12b in a virtual line state to push it by the arcuate locking portion 12b'. The H-shaped steel 10 and the dummy H-shaped steel 11 are separated by canceling the application action. In addition,
Reference numeral 14 is an upper clip, which is provided if necessary.

FIG. 7 illustrates a fourth embodiment of the method for constructing a soil cement column pile retaining wall. FIG. 7A shows a ruler member 15 provided with a guide 15a as shown in FIG. As described above, the soil cement 16 is inserted into the inlet portion. The ruler member 15 is for inserting the H-section steel 17 in a correct eccentric position, and its insertion position is almost the same as the dummy H-section steel 11 of the third embodiment. In this state, the H-shaped steel 17 is inserted into the soil cement 16 while being guided by the guide 15a. FIG. 7B shows a state where the H-shaped steel 17 is completely inserted into the soil cement 16. After the insertion of the H-section steel 17 is completed, the ruler material 15 is pulled up as shown in FIG. 7C before the soil cement 16 is hardened. When the soil cement 16 hardens, the excavation side is scraped to construct a soil cement column (not shown).

In the above examples, soil cement was mixed with excavated soil and a solidifying material such as cement. However, excavated soil was recovered and another sand soil was mixed with cement, bentonite or the like. Soil cement may be placed in the drilled hole. Further, as the stress material, a steel pipe, a steel sheet pile or the like may be used in addition to the shaped steel such as the H-shaped steel.

[0017]

1) Since the stress material is installed eccentrically with respect to the diameter of the drilled hole, the soil cement pillar row retaining wall can be efficiently thinned. 2) Efficiently construct the soil cement column pile retaining wall by eccentrically inserting the stress material to the outside before hardening the soil cement and removing the soil cement on the excavation side to make a thin wall after hardening. You can 3) Insert the stress material accurately with dummy steel material or ruler material,
High precision soil cement pillar pile retaining wall can be constructed.

[Brief description of drawings]

FIG. 1 is a plan view (A) and an ii cross-sectional view (B) showing an embodiment of a soil cement pillar row retaining wall of the present invention.

FIG. 2 is a construction explanatory view (A) and (B) showing a first embodiment of a method for constructing a soil cement column pile retaining wall of the present invention.
It is to be noted that (A) and (B) respectively show a plane above and a longitudinal section below. The same applies to the same drawings.

FIG. 3 is a construction explanatory view (A) and (B) showing a second embodiment of the method for constructing a soil cement column pile retaining wall of the present invention.

FIG. 4 is a construction explanatory view (A) showing a modified example of the second embodiment.
(B).

FIG. 5 is a construction explanatory view (A) and (B) showing a third embodiment of the method for constructing a soil cement pillar row retaining wall of the present invention.

6A to 6C are explanatory views (A), (B) and (C) of the action of the joining clip used in the embodiment of FIG.

FIG. 7 is a construction explanatory view (A), (B), and (C) showing a fourth embodiment of the method for constructing a soil cement pillar pile retaining wall of the present invention.

8A and 8B are configuration explanatory views (A) and (B) of a guide used in the embodiment of FIG.

FIG. 9 is an explanatory view (A) and (B) of a conventional thin wall construction method.

[Explanation of symbols]

1 drilling 2 soil cement 3 H section steel 4 drilling 5 soil cement 5'soil cement pillar 6 H section steel 7 H section steel 8,8 'dummy steel 8 ″ discarded steel 9 soil cement 9'soil cement pillar 10 H section steel 11 Dummy H-section steel 12 joining clips 12a clip body 12b operating rod 12b 'arcuate locking part 13 soil cement 14 Top clip 15 Ruler material 15a guide 16 soil cement G ground

Claims (9)

[Claims] 1. A soil cement is placed in a large number of drill holes formed in a row and adjacently overlap each other, and a stress material is applied in the soil cement of all or selected holes. A soil cement pillar pile retaining wall, in which a stress material is eccentrically installed with respect to a drilling diameter, in the soil cement pillar retaining pile wall. 2. The soil cement column pile retaining wall according to claim 1, wherein the stress material is installed eccentrically to the outside. 3. The soil cement pillar row retaining wall according to claim 1, wherein the stress material is a steel material such as H-section steel. 4. Soil cement is placed in a large number of drill holes formed in rows and so that adjacent holes overlap each other, and stress material is applied in the soil cement of all or selected holes. In the method of constructing a soil cement pillar row retaining wall that is constructed by inserting, the stress material is eccentrically inserted to the outside before the soil cement hardens, and after hardening, the soil cement on the excavation side is removed and thinned. A method for constructing a soil cement pillar pile retaining wall, which is characterized by using a wall. 5. The stress material and the dummy steel material are detachably integrated and inserted, the soil cement on the excavation side is removed after the soil cement is hardened, and the dummy steel material is detached and removed. Claim 4
The method for constructing a soil cement pillar pile retaining wall according to 1. 6. The method for constructing a soil cement pillar column retaining wall according to claim 5, wherein the dummy steel material is removed in a state where a part of the dummy steel material is separated and left at the excavation bottom. 7. The soil cement pillar column retaining wall according to claim 4, wherein a discarded steel material is integrally attached to the excavation side of the lower end portion of the stress material and is inserted into the soil cement. How to build. 8. The soil cement according to claim 4, wherein the stress material and the dummy steel material are detachably inserted in an integrated state, and the dummy steel material is pulled up and removed before hardening of the soil cement. How to build a pillar mountain retaining wall. 9. The soil cement pillar column pile retaining wall according to claim 4, wherein the stress material is inserted while being guided by a ruler material, and the ruler material is pulled up and removed before the soil cement hardens. How to build.