JPH08170493A - Underground concrete wall and construction method thereof - Google Patents

Abstract

PURPOSE: To improve bearing force and durability. CONSTITUTION: A high tension fiber sheet 3 is attached to the surface 2a of lining concrete 2. The high tension fiber sheet 3 and the lining concrete 2 are provided with plural locking bolts 5 piercing the high tension fiber sheet 3 and the lining concrete 2 and reaching the ground 1 so as to make the high tension fiber sheet 3 and the lining concrete 2 stick closely to the ground 1 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground concrete wall such as a tunnel lining, a retaining wall and the like, which is used for all facilities such as roads, railways, harbors, rivers, etc. The present invention also relates to an underground concrete wall capable of improving durability and a construction method thereof.

[0002]

2. Description of the Related Art An underground concrete wall is a generic name used for a wall structure having a concrete wall body provided in contact with the ground, for example, a tunnel lining or a retaining wall. In this underground concrete wall, improvement of its proof strength and durability has been one of the problems from the past, and in order to solve the problem, conventionally, for example, an underground concrete wall having the following structure is used. Has been.

FIG. 5 and FIG. 6 are views showing the structure of a conventional underground concrete wall by taking a tunnel lining as an example.
The tunnel lining is the ground surface 101 of the tunnel 150A.
A rock bolt 105 penetrating to the ground 101 is provided at a plurality of locations of the concrete wall body 102 lining a, and the joint force between the ground 101 and the concrete wall body 102 is increased by the lock bolt 105, whereby The ground 101 and the concrete wall body 102 are integrated. In this structure, since the soil 101 and the concrete wall body 102 are integrated to avoid stress concentration on the concrete wall body 102, it is possible to improve the yield strength and durability of the concrete wall body 102.

The tunnel lining of FIG. 6 is a tunnel 150B.
Concrete wall body 102 lining the ground surface 101a
A high-strength fiber sheet 103 made of carbon fiber, Kevlar, or the like is attached to the ceiling part of the, and the tensile stress generated in the concrete wall body 102 is shared by the high-strength fiber sheet 103, whereby cracks and progress of cracks occur. This is intended to improve the yield strength and durability of the concrete wall body 102.

Other conventional underground concrete wall structures include one in which a steel plate is fixed to a concrete wall body by a lock bolt, one in which concrete or mortar is sprayed to reinforce the concrete wall body.

[0006]

However, in the structure shown in FIG. 5, there is a problem that sufficient yield strength cannot be obtained, especially when a tensile force acts on the concrete wall. In the structure shown in FIG. When a part of the tension fiber sheet is peeled off, the peeling progresses to the whole. That is, there is a problem that it is easily peeled off, and other structures also have problems such as poor workability and a phenomenon of sudden breakage without a warning. Therefore, in recent years, there has been earnest demand for the development of an underground concrete wall which has improved the proof stress and the durability after satisfying various conditions.

In view of the above circumstances, it is an object of the present invention to provide an underground concrete wall capable of improving the yield strength and durability and a method for constructing the same.

[0008]

According to a first aspect of the present invention, there is provided an underground concrete wall, which has a high tensile strength composed of a concrete wall body provided on a ground surface and a bolt mounting portion and a general portion adhered to the surface of the concrete wall body. A fiber sheet, a bolt mounting portion of the high-strength fiber sheet, and a bolt that penetrates through the concrete wall body and is embedded in the ground, and that adheres the high-strength fiber sheet and the concrete wall body to the ground side. .

According to a second aspect of the present invention, there is provided a method for constructing an underground concrete wall, wherein a plurality of drill holes penetrating the ground and a concrete wall body provided on the ground surface are formed, and a fixing material is injected into the drill holes to fix the fixing material. Insert the bolts into the drilled holes and fix them in place, install the nuts on the bolts and tighten them so that the concrete wall body is in close contact with the ground side, remove some nuts from the multiple bolts, and remove the nuts. Attach the bolt mounting part of the high-strength fiber sheet to the concrete wall so that the end of the removed bolt protrudes, and attach the nut to the bolt again so that the high-strength sheet and the concrete wall adhere to the ground side. It is characterized by tightening and repeating this work to provide high-tensile fiber sheets respectively at the positions hitting each bolt on the ground surface, and sticking the general part of the high-tensile fiber sheet between each high-tensile fiber sheet on the ground surface. To.

[0010]

According to the underground concrete wall of claim 1,
Since the concrete wall and the ground can be integrated with the bolt, stress concentration on the concrete wall can be avoided. Further, since the high-strength fiber sheet is attached to the concrete wall body, it is possible to share the tensile stress generated in the concrete wall body and prevent the generation and progress of cracks. Therefore, it is possible to improve the yield strength and durability of the concrete wall body as compared with the case where only the conventional bolt is provided or the case where only the high tension fiber sheet is attached.

Further, since the high-strength fiber sheet can prevent the peeling pieces from falling due to the deformation (for example, progress of cracks) of the concrete wall body, it is possible to prevent an accident such as a sudden falling of the peeling pieces. Can be done. When the concrete wall body is thus deformed, it is possible to easily reinforce it by injecting a resin or stacking high-strength fiber sheets.

According to the method for constructing an underground concrete wall according to claim 2, a plurality of drill holes penetrating the ground and the concrete wall body provided on the ground surface are formed, and a fixing material is injected into the drill holes. Bolts are inserted and fixed in the drilling holes into which the fixing material has been injected, and nuts are provided on the bolts to tighten the concrete wall body so that it adheres closely to the ground side, so the concrete wall body is crimped to the ground, The integration of the concrete wall and the ground is enhanced. This can prevent the concrete wall body from collapsing.

Next, some of the nuts of the plurality of bolts are removed, a high-tensile fiber sheet is attached to the concrete wall so that the ends of the bolts from which the nuts have been removed project, and the nuts are provided again on the bolts. Tighten the high-tensile sheet and the concrete wall body so that they are in close contact with the ground side, and repeat this work to install the high-tensile fiber sheet at the position where each bolt on the ground surface hits, so crimp the concrete wall body to the ground. It is possible to attach the high-strength fiber sheet to the position where each bolt contacts the surface of the ground while the collapse of the concrete wall is prevented. Therefore, in the case of repairing the concrete wall provided on the ground surface,
It can be done in a safe state that has prevented the collapse.

Since the underground concrete wall can be constructed by adhering the high-strength fiber sheets between the respective high-strength fiber sheets on the surface of the ground, it has the same function as that of claim 1.

Further, since the high-strength fiber sheet is attached to the position on the ground surface where it hits each bolt, the high-strength fiber sheet is attached between the high-strength fiber sheets on the ground surface. When one sheet of high-strength fiber sheet is attached at one time so that the bolt of FIG. 2 is projected, the sheet of high-strength fiber sheet can be attached easily.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 4, a lining 10 is applied to the tunnel 50, and the lining 10 has a lining concrete 2 which is a concrete wall body provided on the ground surface 1a. A high-strength fiber sheet 3 made of carbon fiber, Kevlar, or the like is attached to the surface 2a of the lining concrete 2, that is, the ceiling portion of the inner peripheral surface. Further, in the high-tensile fiber sheet 3 and the lining concrete 2, a plurality of lock bolts 5 penetrating the high-tensile fiber sheet 3 and the lining concrete 2 to reach the ground 1 are provided. It is provided so that the concrete 2 is closely attached to the ground 1 side.

As shown in FIG. 3, the high tension fiber sheet 3 comprises a bolt mounting portion 13 and a general portion 23, and a bolt hole 13a is formed at the center of the bolt mounting portion 13 as shown in FIG. The head portion 5b of the lock bolt body 5a projects into the bolt hole 13a. A male screw is formed on the head portion 5b of the lock bolt body 5a, and a nut 5d is screwed onto the head portion 5b via a washer 5c. In addition, the ground 1 and the lining concrete 2,
A hole H1 into which the lock bolt body 5a is inserted is formed, and the hole H1 includes the lock bolt body 5a and the ground 1.
A fixing material 6 for fixing the lining concrete 2 and the lining concrete 2 is filled.

Bolt mounting portion 13 of high tensile strength fiber sheet 3
Is composed of a square first layer 13A attached to the surface 2a of the lining concrete 2 and a second layer 13B attached to the central portion of the first layer 13A as shown in FIG. The second layer 13B is a square having an area smaller than that of the first layer 13A, and thus a margin is left on the peripheral portion of the second layer 13B.

The general portion 23 of the high tension fiber sheet 3 is shown in FIG.
As shown in FIG. 5, the sheet is formed by a plurality of sheets formed in a band shape, and the edges of the sheets are attached so as to overlap with the adjacent sheets, and are also adjacent to the bolt mounting portion 13 of the high-tensile fiber sheet 3. About thing, it is stuck on the margin.

Since the lining 10 and the like have the above-mentioned structure, the lining concrete 2 and the ground 1 can be integrated by the lock bolt 5 as shown in FIG. Therefore, stress concentration on the lining concrete 2 can be avoided. Further, since the high-strength fiber sheet 3 is attached to the lining concrete 2, it is possible to share the tensile stress generated in the lining concrete 2 and prevent the occurrence of cracks and the progress of cracks. Therefore, the conventional lock bolt 10
It is possible to improve the yield strength and durability of the lining concrete 2 as compared with the case where only 5 is provided or the case where only the high tension fiber sheet 103 is attached. Therefore, the yield strength and durability of the lining 10 can be improved.

Further, by covering the ceiling portion of the lining concrete 2 with the high-tensile fiber sheet 3, it is possible to prevent the peeling pieces from falling due to deformation of the lining concrete 2 (for example, progress of cracks). I can. Therefore, it is possible to prevent an accident such as a sudden fall of a peeling piece, and when the lining concrete 2 is thus deformed, the high-strength fiber sheet 3 is deformed. Can be done. Therefore, it is possible to detect an anomaly before the lining concrete 2 is destroyed, and at that time, it is possible to easily reinforce by injecting the resin or stacking the high-tensile fiber sheet. Therefore, the durability of the lining 10 can be further improved.

An embodiment of the construction method of the lining 10 will be described below. In this description, it is assumed that the lining concrete 2 is provided in advance on the ground surface 1a and the case of repairing or reinforcing the lining concrete 2 is assumed.

First, as shown in FIG. 1, a plurality of drill holes H1 are formed to penetrate the ground 1 and the lining concrete 2 provided on the ground surface 1a. The fixing material 6 is injected into each of the drilled holes H1, and the lock bolt main body 5a is inserted and fixed in each of the drilled holes H1 into which the fixing material 6 is injected. Then, the nut 5 is attached to the head 5b of each lock bolt body 5a via the washer 5c.
Screw d and fasten the lining concrete 2 so as to be in close contact with the ground 1 side. As a result, the lining concrete 2
It is possible to prevent the lining concrete 2 from collapsing during the construction because it is possible to further strengthen the integration of the ground and the ground 1.

Next, the bolt mounting portions 13 of the high-tensile sheet 3 are sequentially attached to the lock bolts 5 one by one. In that case,
First, the nut 5d and the washer 5c screwed to the main body 5a are removed, and the bolt mounting portion 1 of the high-strength fiber sheet 3 so that the head 5b of the lock bolt main body 5 projects from the bolt hole 13a.
3 is attached to the lining concrete 2. This attachment can be easily performed because the bolt mounting portion 13 of the high tensile strength fiber sheet 3 is as small as about 25 cm 2. At this time, since the nut 5d is fastened to the other lock bolt 5, the lock bolt 5 prevents the lining concrete 2 from collapsing.

Then, the washer 5c and the nut 5d are screwed onto the head 5b of the lock bolt body 5 again, and the high tension sheet 3
The bolt mounting portion 13 and the lining concrete 2 are fastened so as to be in close contact with the ground 1 side. In this way, the bolt mounting portions 13 of the high-strength fiber sheet 3 are attached to the ground surface 1a at the positions corresponding to the lock bolts 5 shown in FIG. Then, finally, the general portion 23 of the high tension fiber sheet 3 is attached between the bolt mounting portions 13 of the high tension fiber sheet 3. The general portion 23 of the high-strength fiber sheet 3 is composed of a plurality of strip-shaped sheets, and the edges thereof are attached to adjacent sheets so as to overlap each other. In addition, the high-tensile fiber sheet 3 adjacent to the bolt mounting portion 13 is stuck and overlapped with the blank portion. The strip-shaped sheet of the general portion 23 has a larger area than the bolt mounting portion 13, but unlike the bolt mounting portion 13, the lock bolt 5 does not penetrate therethrough, so it can be attached relatively easily. Can be done.

Further, since the high tension fiber sheet 3 is configured such that the general portion 23 is adhered between the bolt mounting portions 13 after the bolt mounting portions 13 are adhered, all the lock bolts 5 are projected. As in the case where one high-tensile fiber sheet 3 is attached at one time, the high-tensile fiber sheet 3 can be easily attached.

As described above, according to the above method, the lining 10 of the tunnel 50 shown in FIG. 4 can be easily repaired in a safe state where collapse is prevented.

It should be noted that, in the above embodiment, the present invention is applied to the tunnel 50.
Although the present invention has been described as applied to the lining 10 of the present invention, the present invention is applicable to any underground concrete as long as it is a concrete wall body provided in contact with the ground, that is, a concrete structure having a wall-shaped or floor-slab-shaped wall. It can also be applied to walls and concrete floors, and of course, it may be a retaining wall, a side wall of a basement of a building, a pressure-resistant floor slab, or the like.

[0029]

According to the underground concrete wall of the first aspect, it is possible to prevent the stress concentration on the concrete wall body by the bolt, and prevent the generation and progress of the crack by the high tensile strength fiber sheet. Therefore, it is possible to improve the yield strength and durability of the concrete wall body as compared with the conventional one. Therefore, it is possible to improve the yield strength and durability of the entire underground concrete wall.

Further, the high-tensile fiber sheet can prevent accidents such as accidental fall of peeling pieces, and when such a concrete wall body is deformed, resin injection or high-tensile fiber sheet It can be easily reinforced by stacking. Therefore, the durability of the underground concrete wall can be further improved.

According to the method for constructing an underground concrete wall as claimed in claim 2, in addition to the above effect, in the case of repairing a concrete wall body provided on the ground surface, the repair is a safety preventing collapse. Since the high-tensile fiber sheet can be easily attached, the construction can be performed safely and easily.

[Brief description of drawings]

FIG. 1 is an enlarged side sectional view showing an embodiment of an underground concrete wall of the present invention.

FIG. 2 is an enlarged front view showing an embodiment of the underground concrete wall of the present invention.

FIG. 3 is a front view showing an embodiment of the underground concrete wall of the present invention.

FIG. 4 is a view showing a tunnel lining to which the underground concrete wall of the present invention is applied.

[Fig. 5] Fig. 5 is a view showing a structure of a conventional underground concrete wall by exemplifying a tunnel lining, in which rock bolts penetrating to the ground are provided at a plurality of places of the concrete wall body lining the ground surface of the tunnel. It is a figure which shows a thing.

[Fig. 6] Fig. 6 is a view showing a structure of a conventional underground concrete wall using a tunnel lining as an example, in which a high-strength fiber sheet is attached to a ceiling portion of a concrete wall body lining the ground surface of the tunnel. FIG.

[Explanation of symbols]

1 ... Ground 1a ... Ground surface 2 ... Lining concrete (concrete wall body) 3 ... High tension fiber sheet 5 ... Lock bolt (bolt) 5d ... Nut 6 ... Fixing material 13 ... High tension fiber sheet bolt mounting part (high tension) Fiber sheet) 23 ... General part of high tension fiber sheet (high tension fiber sheet) H1 ... Drilling

Claims (2)

[Claims] 1. A concrete wall body provided on the surface of the ground, a high-strength fiber sheet which is attached to the surface of the concrete wall body and includes a bolt mounting portion and a general portion, and a bolt mounting portion of the high tensile fiber sheet, An underground concrete wall, which penetrates the concrete wall body and is embedded in the ground, and comprises the high-tensile fiber sheet and a bolt for closely adhering the concrete wall body to the ground side. 2. A plurality of drilling holes that penetrate the ground and a concrete wall provided on the ground surface are formed, a fixing material is injected into the drilling holes, and bolts are respectively inserted into the drilling holes into which the fixing material is injected. Inserted and fixed, provided with a nut on the bolt and tightened so that the concrete wall body closely adheres to the ground side, remove a part of the nuts of the plurality of bolts, and remove the nut The bolt mounting portion of the high-strength fiber sheet is attached to the concrete wall body so that the end portion protrudes, and the nut is provided again on the bolt to bring the high-strength sheet and the concrete wall body into close contact with the ground side. Fasten as described above, and repeat this operation to provide high tension fiber sheets at positions corresponding to the bolts on the ground surface,
A method for constructing an underground concrete wall, characterized in that a general part of a high-strength fiber sheet is attached between the high-strength fiber sheets on the surface of the ground.