JP3552534B2 - Underground wall construction method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an underground wall construction method, and particularly to an underground wall construction method for integrating an underground continuous wall and an inner winding wall.
[0002]
[Prior art]
When underground structures such as underground tanks and subway tunnels are to be started and underground structures such as reaching shafts are to be constructed when constructing underground tanks or subway tunnels, it is necessary to cope with deepening or from the viewpoint of earthquake resistance. The continuous wall method is used.
[0003]
The underground diaphragm wall method excavates a narrow flute from the ground, builds a steel cage in this flute, and then casts concrete to form a panel-shaped unit wall. An underground continuous wall is formed by sequentially connecting the unit wall bodies. The underground continuous wall constructed in this manner is used as a part of a temporary retaining wall or a main body wall.
[0004]
Of these, when used for part of the main body wall, after excavating the inside of the pre-formed underground continuous wall, the wall surface is washed with a high-pressure washing machine, or roughened by filing work. A treatment is performed to form an inner winding wall on the inner surface side.
[0005]
At this time, between the underground continuous wall and the inner winding wall, a connecting member such as a reinforcing bar or a stud bolt is buried by the reinforcing bar embedding method or the dowel welding method so as to straddle both, and the integration between the two is integrated. The plan was to resist external forces.
[0006]
However, such a conventional underground wall construction method has a technical problem described below.
[0007]
[Problems to be solved by the invention]
That is, when integrally constructing the underground continuous wall and the inner winding wall, the previously formed underground continuous wall restrains the inner winding wall, and connects the connecting material to the underground continuous wall and the inner winding wall. When these members are interposed between these members, these members themselves constrain the inner winding wall, and when the drying shrinkage or temperature shrinkage of the cast concrete forming the inner winding wall occurs, the deformation is regulated by this restriction. Then, cracks occur on the inner winding wall.
[0008]
The occurrence of such cracks not only impairs aesthetic appearance, but also leads to a decrease in durability and water tightness, and repairing them requires a great deal of labor and time.
[0009]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method of constructing an underground wall capable of greatly reducing the occurrence of cracks in an inner winding wall. Is to do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes an underground continuous wall and an inner winding wall formed inside the underground continuous wall, and straddles between the underground continuous wall and the inner winding wall. In the construction method of the underground wall to embed a connecting member such as a reinforcing bar or a stud bolt, a marginal sheet is interposed on a joint surface between the underground continuous wall and the inner winding wall, and the connecting member is A leading connection portion embedded on the underground wall side; and a subsequent connection portion embedded on the inner winding wall side, wherein the trailing connection portion has one end embedded on the underground continuous wall side. A trailing dowel that is fixed to the connecting portion, and an enlarged head that is fixed to the other end of the trailing dowel and embedded in the inner winding wall; On the outer periphery , a shrinkage absorbing portion that allows deformation in the in-plane direction was provided.
According to the construction method of the underground wall configured as described above, first, the marginal sheet is interposed at the joint surface between the underground continuous wall and the inner winding wall, so that the underground continuous wall is restrained by the inner winding wall. Is eliminated.
Further, the outer periphery of the line dowels muscle after the line connection portion after being embedded in the inner winding wall, since there is provided a contraction-absorbing portion that permits deformation in the in-plane direction, the plane of the trailing coupling portion with respect to the inner winding wall of inward constraint is eliminated.
The shrinkage-absorbing portion may be made of a compression-deformable soft absorbent material such as high-damping rubber, natural rubber, asphalt, and sponge wound around the outer circumference of the trailing dowel.
According to this configuration, since the compressible deformable soft absorbent is wound around the outer periphery of the trailing dowel streak buried on the inner winding wall side, the inner winding wall accompanying drying and temperature shrinkage is formed. Can be tolerated by the soft absorbent, and the addition of a simple structure can eliminate the constraint of the following dominant muscle.
The shrinkage absorbing portion is provided movably along the surface of the edge cutting sheet, and is housed between the tubular body accommodating the trailing dowel and the trailing dowel. And a granular absorbent.
According to this configuration, the shrinkage-absorbing portion is provided so as to be slidable along the surface of the edge-cut sheet, and is provided between the tubular body housing the trailing dowel and the trailing dowel. The inner wall is deformed due to drying and temperature shrinkage, and the cylindrical body is allowed to slide along with the movement of the granular absorbent. Is eliminated.
Further, the present invention includes an underground continuous wall, and an inner winding wall formed inside the underground continuous wall, and a reinforcing bar or a stud bolt is provided so as to straddle between the underground continuous wall and the inner winding wall. In the construction method of an underground wall for burying a connecting material such as, an interfacing sheet is interposed on a joint surface between the underground continuous wall and the inner winding wall, and the connecting material is embedded on the underground wall side. Construction of an underground wall including a leading connection part to be formed and a trailing connection part buried in the inner winding wall side, wherein the trailing connection part is provided with a shrinkage absorbing part that allows deformation in an in-plane direction. In the method, the trailing connecting portion is connected to a leading connecting portion embedded in the underground continuous wall, and a plate portion slidably provided along the edge cutting sheet; and A plurality of fixed trailing dowels, one end of which is connected to the preceding connecting portion; A connecting portion comprising a bolt nut is inserted through the hole of the side is provided in the plate portion is screwed, it is provided the contraction-absorbing portion between the bolt the through hole.
According to this configuration, since the shrinkage absorbing portion is provided at the connecting portion between the plate of the succeeding connecting portion and the preceding connecting portion, in-plane deformation of the inner winding wall is allowed by the shrinkage absorbing portion, and The constraint on the connection is eliminated.
The edge cutting sheet can be configured in a two-layer structure including a water-permeable sheet disposed on the underground continuous wall side and a water-blocking sheet disposed on the inner winding wall side.
According to this configuration, the water that has penetrated into the underground continuous wall is blocked by the water-blocking sheet disposed on the inner winding wall side, and flows down along the water-permeable sheet, so that the underground wall stops. The water is improved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of the underground wall construction method according to the present invention.
[0012]
In the construction method of the underground wall shown in the figure, after the underground continuous wall 10 is formed, the inner winding wall 12 is integrally built inside the underground continuous wall 10. A margin sheet 15 is interposed between the underground continuous wall 10 and the inner winding wall 12, and a connecting member 14 is installed so as to straddle between the underground continuous wall 10 and the inner winding wall 12. You.
[0013]
The connecting member 14 includes a preceding connecting portion 16 buried on the underground continuous wall 10 side and a following connecting portion 18 buried on the inner winding wall 12 side.
[0014]
The underground diaphragm wall 10 is constructed by an underground diaphragm wall construction method, and as shown in FIG. 1, a narrow vertical groove 10a is excavated from the ground, and a reinforcing cage 10b is placed in the vertical groove 10a. The underground continuous wall 10 is formed by constructing and then casting concrete to form a panel-shaped unit wall and sequentially connecting such unit walls in the horizontal direction.
[0015]
When such an underground continuous wall 10 is formed, the leading connecting portion 16 is locked in advance to the reinforcing bar cage 10b built in the vertical groove 10a. The leading connection portion 16 of the present embodiment includes a joining plate 16a disposed close to the inner winding wall 12 and a plurality of leading gibber studs 16b fixed to one surface of the joining plate 16a.
[0016]
An enlarged head 16c is formed at the distal end of each leading gibber muscle 16b. When the underground continuous wall 10 in which the leading connection portion 16 is buried is formed, the inside of the underground continuous wall 10 is excavated.
[0017]
When the root cutting excavation is completed, an operation of laying the marginal sheet 15 and connecting the trailing connecting portion 18 and the preceding connecting portion 16 are performed before the inner winding wall 12 is formed on the inner surface side.
[0018]
In the case of the present embodiment, the edge cut sheet 15 has a two-layer structure of a water-permeable sheet 15a and a water-stop sheet 15b as shown in a partially enlarged view in FIG. When laying on the inner surface of the underground continuous wall 10, the water-permeable sheet 15 a is set on the underground continuous wall 10 side, and the water-blocking sheet 15 b is set on the inner winding wall 12 side formed therefrom. I do.
[0019]
Such a trim sheet 15 is laid so as to be interposed over the entire surface where the underground continuous wall 10 and the inner winding wall 12 are joined. The connection operation of the following and preceding connection units 18 and 16 is performed in the following procedure.
[0020]
That is, as shown in FIGS. 2 and 3, the trailing connecting portion 18 of the present embodiment is composed of a plurality of trailing gibber muscles 18a, and an enlarged head 18b is provided at the tip side of each trailing gibber muscle 18a. Is provided.
[0021]
Further, a shrinkage absorbing portion 20 that allows the in-plane deformation of the inner winding wall 12 is provided on the outer periphery of each trailing dowel 18a. As shown in FIG. 3, the contraction absorbing portion 20 of the present embodiment is formed of a flexible soft absorbing material 20a wound at an appropriate length on the outer periphery of the dowel muscle 18a except for the enlarged head 18b.
[0022]
Such a soft absorbent 20a is selected from, for example, members that can be compressed and deformed, such as high-damping rubber, natural rubber, asphalt, and sponge. The base of each trailing dowel 18a provided with the shrinkage absorbing portion 20 is fixed to the joining plate 16a of the preceding connecting portion 16 by welding.
[0023]
In this case, the welding position of each trailing dowel line is set so as to be located on substantially the same straight line as the leading dovetail line 16c. As described above, when the laying of the trimming sheet 15 and the connection work of the trailing connection portion 18 are completed, the reinforcing bar 21 is assembled, the formwork is installed, and the concrete for the inner winding wall 12 is cast, When the cast concrete is cured and then released, the formation of the inner winding wall 12 is completed, and the construction of the underground wall integrating the underground continuous wall 10 and the inner winding wall 12 is completed.
[0024]
Now, according to the underground wall construction method performed as described above, first, the marginal sheet 15 is interposed on the joint surface between the underground continuous wall 10 and the inner winding wall 12 over the entire surface. Therefore, the restraint of the underground continuous wall 10 against the inner winding wall 12 is eliminated by the edging sheet 15.
[0025]
Further, since the trailing connecting portion 18 embedded on the inner winding wall 12 side is provided with the shrinkage absorbing portion 20 that allows the in-plane deformation of the inner winding wall 12, the trailing connecting portion to the inner winding wall 12 is provided. The 18 restraints are also eliminated.
[0026]
Therefore, by the synergistic action of these, the degree of freedom of drying and temperature shrinkage of the inner winding wall 12 is ensured, and the occurrence of cracks that impair the aesthetic appearance, the water stoppage and the durability can be greatly reduced.
[0027]
In this case, a part of the trailing connecting portion 16, more specifically, the enlarged head 18 b of the trailing dowel muscle 18 a is buried in the inner winding wall 12 so as to directly contact with the inner winding wall 12. The horizontal load from the wall 10 side is transmitted to the inner winding wall 12 via this portion, and the integrity of the underground continuous wall 10 and the inner winding wall 12 can be secured.
[0028]
Further, in the case of the present embodiment, the shrinkage absorbing portion 20 is formed of a soft absorbent 20a wound around the outer periphery of the following dovetail 18a. The deformation of the inner winding wall 12 due to the temperature shrinkage is allowed by the deformation of the soft absorbent material 20a, and the addition of a simple configuration eliminates the constraint of the subsequent dovetail muscle 18a.
[0029]
Further, in the case of the present embodiment, the edge cutting sheet 15 has a two-layer structure including a water-permeable sheet 15a disposed on the underground continuous wall 10 side and a water-blocking sheet 15b disposed on the inner winding wall 12 side. Therefore, the water that has penetrated into the underground continuous wall 10 is blocked by the waterproof sheet 15b disposed on the inner winding wall 12 side, and flows down along the water-permeable sheet 15a. The water stoppage of the winding wall 12 is improved.
[0030]
FIG. 4 shows a second embodiment of the underground wall construction method according to the present invention. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, only the characteristic points will be described.
[0031]
In the embodiment shown in the figure, the subsequent connecting portion 18 buried on the inner winding wall 12 side is, like the first embodiment, a joining plate of the preceding connecting portion 16 buried on the underground continuous wall 10 side. It has a trailing dowel 18a fixed to 16a.
[0032]
On the other hand, the shrinkage-absorbing portion 200 that allows deformation in the in-plane direction is provided between the cylindrical body 200a slidable along the surface of the edge cutting sheet 15 and the cylindrical body 200a and the trailing dowel 18a. And a particulate absorbing material 200b filled in the space.
[0033]
The particulate absorbent 200b may be, for example, any of hard particles such as crushed stones or soft particles such as rubber. In the case of hard particles, a comparison is made so that the particles can move within the cylinder 200a. Fill loosely.
[0034]
Further, in the case of a soft particle, the cylinder itself may be deformed, and therefore may be densely filled in the cylinder 200a.
[0035]
According to the shrinkage-absorbing section 200 configured in this manner, similarly to the first embodiment, the deformation of the inner winding wall 12 due to drying and temperature shrinkage causes the sliding movement of the cylindrical body 200a accompanied by the movement and deformation of the granular absorbent 200b. The movement is permitted, and the restraint of the following dovetail muscle 180a is eliminated.
[0036]
In the case of the present embodiment, for example, a viscous agent such as grease is interposed between the cylinder 200a and the marginal sheet 15 and between the cylinder 200a and the enlarged head 180b, and the cast concrete is wrapped around. Need to be prevented.
[0037]
FIG. 5 shows a third embodiment of the underground wall construction method according to the present invention, in which the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Hereinafter, only the characteristic points will be described.
[0038]
In the embodiment shown in the figure, the trailing connecting portion 180 buried on the inner winding wall 12 side includes a flat plate portion 180a, and a plurality of trailing dowels 180b fixed to the plate portion 180a. It has.
[0039]
The plate portion 180a is slidably provided along the surface of the edge cutting sheet 15, and a through hole 180c is formed at the center thereof. The through-hole 180c is formed in, for example, a circular shape, an elliptical shape, and an oblong shape, and the shrinkage absorbing portion 201 is provided on an inner peripheral surface thereof.
[0040]
The shrinkage absorbing portion 201 of this embodiment is a compressible deformable shrinkage absorption member 201a such as high-damping rubber, natural rubber, asphalt, sponge, etc., similar to the first embodiment, and has a through hole at the center. The ring-shaped contraction member 201a is bonded and fixed to the through hole 180c.
[0041]
The trailing connecting portion 180 of the present embodiment is connected to the preceding connecting portion 16 through the shrinkage absorbing portion 201 that allows in-plane deformation in the following configuration.
[0042]
The connecting portion shown in FIG. 5 includes a bolt 22 fixed to the joining plate 16 a and a nut 24 screwed to the bolt 22. , The leading and trailing connecting portions 16 and 181 are joined.
[0043]
According to the underground wall configured as described above, since the shrinkage absorbing portion 201 is provided at the connecting portion between the plate 180a of the subsequent connecting portion 180 and the preceding connecting portion 16, the inner winding wall 12 is Although restricted by the connecting portion 180, the inner winding wall 12 is allowed to deform in the in-plane direction by the sliding movement of the plate 182a accompanied by the deformation of the shrinkage absorbing portion 201, so that the occurrence of cracks can be reduced. .
[0044]
In the embodiment shown in FIG. 5, since the bolt 22 is relatively short, the bolt 22 can be fixed to the joining plate 16a in advance, and can be removed at the time of excavation.
[0045]
Further, in the embodiment shown in the figure, similarly to the second embodiment, it is necessary to take a measure for preventing the cast concrete from entering between the plate 180a and the trim sheet 15.
[0046]
【The invention's effect】
As described above in detail in the embodiment, according to the underground wall construction method according to the present invention, it is possible to greatly reduce the occurrence of cracks in the inner winding wall.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional explanatory view showing a state in which an underground continuous wall is formed and the inside is excavated and excavated after forming an underground continuous wall in a first embodiment of an underground wall construction method according to the present invention.
FIG. 2 is an explanatory sectional view of a step of constructing an inner winding wall performed subsequently to FIG. 1;
FIG. 3 is an enlarged view of a main part of FIG. 2;
FIG. 4 is an explanatory sectional view of a main part showing a second embodiment of the underground wall construction method according to the present invention.
FIG. 5 is an explanatory sectional view of a main part showing a third embodiment of the underground wall construction method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Underground continuous wall 12 Inner winding wall 14 Connecting material 15 Edge cutting sheet 16 Leading connection part 18,180 Trailing connection part 18a Trailing dive bar 18b Enlarged head part 20,200,201 Shrinkage absorption part

Claims (5)

An underground continuous wall and an inner winding wall formed inside the underground continuous wall, and a connecting member such as a reinforcing bar or a stud bolt is embedded so as to straddle between the underground continuous wall and the inner winding wall. In the construction method of the underground wall that
A trim sheet is interposed on the joint surface between the underground continuous wall and the inner winding wall,
The connecting member includes a leading connecting portion embedded on the underground wall side and a trailing connecting portion embedded on the inner winding wall side, and the trailing connecting portion has one end at the underground continuous wall. A trailing dowel that is fixed to the leading joint buried on the side, and an enlarged head that is fixed to the other end of the trailing dowel and embedded in the inner winding wall,
A method of constructing an underground wall, wherein a shrinkage-absorbing portion that allows in-plane deformation is provided on the outer circumference of the following dowel . 2. The underground according to claim 1, wherein the shrinkage absorbing portion is made of a compression-deformable soft absorbing material such as high-damping rubber, natural rubber, asphalt, and sponge wound around the outer periphery of the trailing dowel. Wall construction method. The shrinkage-absorbing portion is provided slidably along the marginal sheet, and includes a tubular body that houses the trailing dowel, and a granular body that is stored between the tubular body and the trailing dowel. The construction method of an underground wall according to claim 1, comprising an absorbent material. An underground continuous wall and an inner winding wall formed inside the underground continuous wall, and a connecting member such as a reinforcing bar or a stud bolt is buried between the underground continuous wall and the inner winding wall. In the construction method of the underground wall that
  While interposing a margin sheet on the joint surface between the underground continuous wall and the inner winding wall,
  The connecting material includes a preceding connecting portion embedded on the underground wall side and a following connecting portion embedded on the inner winding wall side, and allows the following connecting portion to deform in an in-plane direction. Construction method of underground wall provided with shrinkage absorbing part
  The trailing connecting portion is connected to a leading connecting portion embedded in the underground continuous wall, and a plate portion slidably provided along the edge cutting sheet, and a plurality of fixing portions fixed to the plate portion. With the following dovetail muscle,
  One end is connected to the preceding connection portion, and the other end side has a connection portion formed by a bolt into which a nut is screwed through a through hole provided in the plate portion,
  The underground wall construction method, wherein the shrinkage absorbing portion is provided between the bolt and the through hole. The said edge cut sheet is a two-layer structure which consists of a water-permeable sheet arrange | positioned at the said underground continuous wall side, and a water stoppage sheet arrange | positioned at the said inner winding wall side, The Claims 1 to 4 characterized by the above-mentioned. The method for constructing an underground wall according to any one of the above items.

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