JP2000328572A - Temporary earth retaining timbering method in underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a working environment from deteriorating and a resulting cost from increasing at the time of removal produced in a temporary earth retaining timbering supporting walls applied with an external force such as earth pressure and hydraulic pressure. SOLUTION: A temporary earth retaining tempering supports a plurality of walls constructed under the ground and is removed after a specified process is completed. The temporary earth retaining timbering 1 comprises a support member 5 supporting the walls 10 in horizontal direction and a partition plate 4 provided between the support member 5 and the walls 10. After the temporary earth retaining timbering 1 is installed in an excavated groove corresponding to the size of the temporary earth retaining timbering 1, filler 2 is filled in a space between a ground 30 and the temporary earth retaining timbering 1, and the filler is collapsed when the ground surrounded by the walls and the temporary earth retaining timbering is excavated. Thus, the partition plate 4 and the support member 5 are allowed to be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a temporary retaining structure for an underground continuous wall.

[0002]

2. Description of the Related Art It is necessary to support a continuous wall before constructing a post-cast body such as a continuous wall or a floor of an underground structure, but it is unnecessary after the post-cast frame is built and is removed. Some of the temporary earth retaining structures are constructed of reinforced concrete as shown in FIG.

[0003] In this method, there is a problem in that, when removing the earth retaining structure after the construction of the post-cast body, the work environment is deteriorated due to the dust accompanying the pulverization of the concrete, the removal time is increased, and the removal cost is increased.

As a method for solving the above-mentioned problem, it is generally used to use a shore retaining method shown in FIG. 13 or an earth anchor method shown in FIG. 14, but the shore retaining method has limited construction conditions. The earth anchor method has a limitation that it cannot be used when there is a buried object such as a gas pipe on the outside because the earth anchor penetrates outside the continuous wall.

[0005] Further, what is shown in FIG. 15 is one in which the retaining wall is abolished by increasing the wall thickness of the continuous wall and increasing the strength of the continuous wall itself. It may interfere with existing buried objects and structures,
In order to avoid interference, the inner edge must be moved inward, resulting in a dilemma of reducing the inner space space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for temporarily retaining a retaining ground in an underground continuous wall of a reinforced concrete structure which solves these problems.

[0007]

According to a first aspect of the present invention, there is provided a method of supporting a plurality of walls constructed underground, and providing a temporary soil retaining support for an underground continuous wall which is removed after a predetermined process.
The temporary soil support includes a support member that supports the wall in a horizontal direction and a partition plate interposed between the support member and the wall, and the temporary soil support is provided in an excavation groove corresponding to the size of the temporary soil support. After installing, filling the gap between the ground and the temporary soil support with filler, the filler is collapsed when excavating the ground surrounded by walls and the temporary soil support, and the partition plate and the support member can be removed. did.

In a second aspect based on the first aspect, the filler is crushed stone or sand.

In a third aspect based on the first or second aspect, the support member is made of a steel material.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the support member has a jack means for adjusting the length of the support member.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the jack means includes two supporting members having the same height.
The support members are installed at different positions in the length direction.

[0012] In a sixth aspect based on any one of the first to fifth aspects, the temporary soil retaining support is fixed below the filler by concrete.

[0013]

According to the first to third aspects of the present invention, after a temporary earth retaining support composed of a partition plate and a support member is installed in a predetermined excavation groove, a filler, for example, crushed stone or sand is filled. It can resist external force such as earth pressure and water pressure acting on the wall. In addition, when excavating the ground surrounded by the wall and the temporary soil retaining support, the filler also collapses together with the ground, so that the temporary soil retaining support can be easily removed.

If a floor is constructed between the walls after excavating the ground surrounded by the wall and the temporary retaining support, the external force is supported by the floor, so that the temporary retaining support can be removed.
In the present invention, the support member can be removed very easily and in a short time, for example, by cutting.
Therefore, it is possible to shorten the entire construction period and reduce the construction cost.

According to a fourth aspect of the present invention, the support member is provided with jack means for adjusting the length of the support member. Therefore, the jack means is loosened and the support member is shortened when removing the earth retaining support. Work can be performed safely and efficiently.

According to a fifth aspect of the present invention, the jack means are disposed at different positions in the longitudinal direction of the support member between adjacent support members having the same height. The work can be performed safely and efficiently without the means being in the way.

According to the sixth aspect of the present invention, since the temporary soil retaining support is fixed with concrete on the lower side of the filler, the temporary soil retaining support can be stabilized, and the filler can be safely and reliably filled.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of a method of supporting a temporary soil retaining structure on an underground continuous wall according to the present invention.

To explain this, FIG. 1 shows a temporary soil support 1 and a continuous wall 1 supported by the temporary soil support 1.
0 indicates a state in which the continuous ground 10 is excavated in the next step, and an external force F such as earth pressure and water pressure acts on the continuous wall 10 to deform the continuous wall 10. 1 is deterred.

FIG. 2 is a cross-sectional view schematically showing the earth retaining structure, in which a gap between the temporary support 1 and the ground 30 is filled with crushed stones 2 to prevent the ground 30 from collapsing.

The filler is not limited to crushed stone, but may be sand, for example.

The crushed stone 2 is cast with concrete (lower concrete 3) at a depth of several meters as a rooting portion of the temporary support 1 and is fixed at a predetermined position.

The temporary soil retaining support 1 does not necessarily need to be formed over the continuous walls 10, but may be used only partially.

Next, the structure of the temporary earth retaining support 1 will be described with reference to FIGS.

The temporary earth retaining support 1 as a preceding element is composed of a partition plate 4 made of a steel plate in contact with the continuous wall 10 and a support member 5 formed between the two partition plates 4 and formed of, for example, H-shaped steel. ing.

Note that, depending on the length of the temporary soil retaining support 1, it is possible to extend the length by connecting the plurality of partition plates 4 using the connecting plate 6 and the connecting bolts 7.

By installing jacks 8 on each support member 5 as shown in FIG. 5, when removing the temporary soil retaining support 1 after construction, the jacks 8 can be efficiently removed by loosening the jacks 8.

Next, a method of installing the temporary soil retaining support 1 of the present invention will be described with reference to FIGS.

First, in FIG. 6, a groove corresponding to the temporary soil retaining support is excavated by the clam shell 20 suspended from the crane 21. At this time, muddy water 22 containing bentonite or the like is injected into the trench according to the excavation to protect the excavated surface.

Next, as shown in FIG. 7, the temporary soil retaining support 1 is hung in the groove using the hanging tool 25.

Thereafter, as shown in FIG.
The ready-mixed concrete which forms the lower concrete 3 from the ready-mixed concrete truck 27 on the ground is put into the lower part in the groove. The muddy water 22 in the groove is discharged from a headway (not shown) according to the input of the ready-mixed concrete.

When the concrete placement is completed in this way, the crushed stone 2 is continuously filled in the groove.

In the above steps, the construction of the temporary soil retaining support 1 is completed, and the continuous wall 10 as a subsequent element is constructed.

FIG. 9 shows a state in which the concrete of the predetermined continuous wall 10 has been poured and cured.
Excavate the ground 30 surrounded by 0 and the temporary soil retaining support 1. When the ground 30 is excavated, the crushed stone 2 filled in the temporary soil retaining support 1 is also removed, and a floor 11 connecting the continuous walls 10 is constructed from below (shown by a broken line in FIG. 10). By constructing the floor 11, the floor 11 has a function of resisting an external force acting on the continuous wall 10, so that the temporary soil retaining support 1 can be removed.

FIG. 11 shows a state where the temporary soil retaining support 1 is removed.

The temporary soil retaining support 1 can be easily removed by cutting the support member 5, but as described above, the support member 5 can be more efficiently removed by interposing the jack 6 therein. Work can be done.

As described above, in the temporary soil retaining method of the present invention, the temporary soil retaining structure 1 composed of the partition plate 4 and the support member 5 is installed in a predetermined excavation groove, and then the crushed stone 3 is filled. That is, the earth pressure acting on the continuous wall 10,
It can resist external force such as water pressure. In addition, continuous wall 1
When excavating the ground 30 surrounded by 0 and the temporary soil support 1, the crushed stone 3 also collapses together with the ground 30, so that the temporary soil support 1 can be easily removed.

Further, if a floor 11 is constructed between the continuous wall 10 after excavating the ground 30 surrounded by the continuous wall 10 and the temporary soil retaining support 1, external force is supported by the floor. The support member 5 can be removed.
By cutting or loosening the jack 8, removal can be performed very easily and in a short time. Therefore,
The entire construction period can be shortened and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a front view showing the structure of the temporary soil retaining support.

FIG. 4 is a side view of the same.

FIG. 5 is a plan view of the same.

FIG. 6 is a front view showing the construction method (ditch excavation state).

FIG. 7 is a front view showing the construction method (a state of being carried into a temporary retaining retaining groove).

FIG. 8 is a front view showing the construction method (concrete casting state).

FIG. 9 is a plan view showing a completed state of the continuous wall concrete casting.

FIG. 10 is a sectional view of the same.

FIG. 11 is a front view showing the disassembled state.

FIG. 12 is a plan view showing a conventional example.

FIG. 13 is a plan view showing a conventional example.

FIG. 14 is a plan view showing a conventional example.

FIG. 15 is a plan view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temporary earth retaining support 2 Crushed stone 3 Lower concrete 4 Partition plate 5 Support member 6 Connection plate 7 Connection bolt 8 Jack 10 Continuous wall 11 Floor 30 Ground

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Junichi Wadano 2-35 Yatacho, Shinjuku-ku, Tokyo Dainippon Civil Engineering Co., Ltd. F-term (reference) 2D049 AA07 AA08 EA02 GA16 GC03

Claims (6)

[Claims] 1. A method of supporting a plurality of walls constructed underground and removing the temporary underground continuous wall after a predetermined process is completed, wherein the temporary soil retaining support horizontally supports the walls. A support member and a partition plate interposed between the support member and the wall, and after installing the temporary soil support in an excavation groove corresponding to the size of the temporary soil support, the ground and the temporary soil support are connected to each other. Filling the gap with a filler, the filler collapses during excavation of the ground surrounded by the wall and the temporary soil retaining support, and the partition plate and the support member can be removed. Soil retaining method. 2. The method according to claim 1, wherein the filler is crushed stone or sand. 3. The method according to claim 1, wherein the support member is made of a steel material. 4. The temporary retaining soil in an underground continuous wall according to claim 1, wherein the supporting member has a jack means for adjusting a length of the supporting member. Shoring method. 5. The temporary installation in an underground continuous wall according to claim 4, wherein the jack means is installed at different positions in the length direction of the support member between adjacent support members having the same height. Soil retaining method. 6. The method according to claim 1, wherein the temporary soil retaining support is fixed below the filler by concrete. .