JP2019148130A - Composite underground outer wall and construction method of the same - Google Patents

Abstract

To provide a composite underground outer wall and a construction method of the same capable of making an earth retaining wall (SMW) constructed underground a part of an external force applied to an underground wall and stopping underground water penetrating SMW.SOLUTION: A composite underground outer wall 100 comprises a soil cement wall body 10, a plurality of studs 20, a water cutoff sheet 30, and an underground wall 40. Inside the soil cement wall body 10, a plurality of mold steels 12 (H-shaped steels) are buried. One end of the stud 20 is fixed (welded) to the mold steel 12 exposed from the soil cement wall body 10, and the stud 20 extends inward (to a building side). The water cutoff sheet 30 is stuck to an inner wall face 10a facing a construction joint face 42 or a joint of the concrete underground wall 40 before construction of the underground wall 40. The underground wall 40 is constructed by using the inner wall face 10a as a formwork, and a reinforcement 44 is connected to the stud 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a synthetic underground outer wall integrated with a mountain retaining wall by an SMW method and a construction method thereof.

  SMW (Soil Mixing Wall) is an abbreviation of a wall wall (Wall) formed in the ground by mixing and stirring soil (Soil) and cement slurry in situ.

The SMW method is a method of making a soil cement mountain retaining wall by drilling the ground with a specially developed multi-axis kneading auger machine, discharging cement slurry from the tip of the ground, and kneading one element. It is. In addition, the continuous wall of the continuous soil cement is formed by completely wrapping the hole kneading shaft at the end of the element on the next element.
The underground outer wall (mountain wall) created in the ground by the SMW method described above is disclosed in, for example, Patent Documents 1 to 3.

  Patent Document 1 “Outer heat insulation / outer waterproofing method for underground outer wall” is a method of forming a mountain stop in the ground, and removing the inner side of this mountain stop, and then forming an outer heat insulating layer and a waterproof layer on the inner wall surface of the mountain stop. And the inner heat insulating layer are formed in close contact with each other, and the inner wall is further in close contact with the inner heat insulating layer.

  In “Paper wall waterproofing method” in Patent Document 2, the mountain wall is composed of H steel and soil cement. Using a flexible membrane having an opening at a portion corresponding to the separator protruding from the exposed surface of the H steel, the separator is protruded from the opening to cover the mountain retaining wall surface, and fixed to the soil cement surface with a fixture. A waterproof material is applied from above the flexible film body and cured to form a polyurethane waterproof layer bonded to the exposed surface of the H steel through the opening.

  In “Synthetic underground outer wall and its construction method” of Patent Document 3, a stud is infused into a steel frame which is a core material of SMW and embedded in an RC wall, and a fixing head is integrally formed at the tip as the stud. Using a reinforcing bar, it also serves as a shear reinforcement in the RC wall.

Japanese Patent Publication No. 6-76694 JP 2001-159136 A JP 2002-371545 A

  In Patent Document 1, an outer heat insulating layer, a waterproof layer, and an inner heat insulating layer are interposed between a mountain retaining wall (SMW) formed in the ground and an underground outer wall. Each of these layers is made of a material (for example, rubber, synthetic resin, etc.) having a lower rigidity than that of concrete or steel. For this reason, the adhesion force between the SMW and the underground wall (underground outer wall) is small, and it is necessary to support the external force acting on the underground wall with the rigidity of the underground wall only. As a result, the thickness of the underground wall is large, the amount of reinforcing bars is increased, the construction cost is high, and the effective area of the site constructed with the underground wall is reduced.

  In Patent Document 2, a polyurethane waterproof layer is formed on the inner surface of a mountain retaining wall (SMW) with a flexible film body and a waterproof material. When the underground wall is constructed on the inner side, a polyurethane waterproof layer is interposed between the SMW and the underground outer wall. Therefore, as in Patent Document 1, the adhesion force between the SMW and the underground wall is small, and it is necessary to support the external force acting on the underground wall with the rigidity of the underground wall only. As a result, similar to Patent Document 1, the thickness of the underground wall is large, the amount of reinforcing bars is increased, the construction cost is high, and the effective area of the site constructed with the underground wall is reduced.

  In Patent Document 3, the waterproof layer in Patent Documents 1 and 2 is omitted, and a stud fixed to a steel frame that is a core material of SMW is embedded in an RC wall, and a mountain retaining wall (SMW) formed in the ground and a ground The middle wall (RC wall) is integrated. Therefore, it is impossible to stop the groundwater that has passed through the SMW.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a synthetic underground outer wall that can cause a part of the external force acting on the underground wall to be borne by the mountain retaining wall (SMW) formed in the ground and can stop the groundwater that has passed through the SMW. And providing its construction method.

According to the present invention, a soil cement wall body in which a plurality of steel molds extending vertically and spaced apart from each other in the horizontal direction is embedded in the ground,
One end is fixed to the mold steel exposed from the soil cement wall, and a plurality of studs extending inward from the mold steel;
A waterproof sheet attached to the inner wall surface of the soil cement wall body and having a predetermined waterproof width;
A concrete underground wall constructed with the inner wall surface as a mold and having a reinforcing bar connected to the stud,
The water-stop sheet is provided with a synthetic underground outer wall that is affixed to the inner wall surface of the soil cement wall facing the joint surface or joint of the underground wall before the underground wall is constructed. The

Moreover, according to the present invention, a construction method for constructing the above synthetic underground outer wall,
A sheet sticking step of attaching the water stop sheet having the water stop width to the inner wall surface of the soil cement wall body facing the joint surface and the joint of the underground wall before construction of the underground wall. A method for constructing a synthetic underground outer wall is provided.

  The inventor of the present application has obtained a new finding that the place where the groundwater permeates the underground wall is mainly a joint surface or joint of concrete. The present invention is based on such novel findings.

  According to the present invention, on the inner wall surface of the soil cement wall facing the joint surface or joint of the underground wall made of concrete, a waterproof sheet is attached before the underground wall is constructed. It has a predetermined water stop width. The water-stop sheet is in close contact with the joint surface or joint of the underground wall constructed thereafter by the pressure at the time of concreting, and stops the joint surface or joint of the underground wall. Accordingly, it is possible to stop the groundwater at the joint surface or joint of the concrete, which is likely to cause a problem with water stoppage.

  In addition, since a water-stop sheet having a water stop width is used, the mold steel of the soil cement wall body is integrated with the underground wall in which the reinforcing bar is connected to the stud through the stud in the most range excluding the water stop width. . Thereby, a part of external force which acts on an underground wall can be borne by the steel mold of a soil cement wall body via a stud.

It is a vertical sectional view showing an embodiment of a synthetic underground outer wall according to the present invention. It is sectional drawing in the AA of FIG. It is sectional drawing in the BB line of FIG. 2, and its partial enlarged view. It is a whole flow figure of the construction method which constructs a synthetic underground outer wall. It is explanatory drawing of the construction method which builds a synthetic underground outer wall.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 1 is a vertical sectional view showing an embodiment of a synthetic underground outer wall 100 according to the present invention.
In this figure, the synthetic underground outer wall 100 includes a soil cement wall body 10, a plurality of studs 20, a waterproof sheet 30, and an underground wall 40.
Hereinafter, the left side of the soil cement wall body 10 in this figure is referred to as “outside” or “underground side”, and the right side is referred to as “inside” or “building side”.
Moreover, in this figure, X has shown the horizontal joint surface of the underground wall 40. FIG.

  FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and the underground wall 40 is omitted in this figure. In this figure, Y indicates a vertical joining surface extending in the vertical direction of the underground wall 40.

1 and 2, a soil cement wall body 10 is a mountain retaining wall (SMW) in which a plurality of soil cement columns 11 are continuously integrated and formed in the ground 1.
A plurality of steel molds 12 are embedded in the soil cement wall body 10. The steel shapes 12 extend vertically (in the up-down direction in FIG. 2) at intervals from each other in the horizontal direction (left-right direction in FIG. 2).

The mold steel 12 is preferably an H-shaped steel. The plurality of mold steels 12 may be provided on each of the plurality of soil cement columns 11, and one or a plurality of soil cement columns 11 having no mold steel 12 may be provided between adjacent mold steels 12.
The magnitude | size of the soil cement pillar 11 and the space | interval of the shape steel 12 are set according to the earth pressure etc. of the underground 1 made into object.

3A is a cross-sectional view taken along line BB in FIG. 2, and FIG. 3B is a partially enlarged view thereof.
3A and 3B, one end of each of the plurality of studs 20 is fixed to the mold steel 12 exposed from the soil cement wall body 10, and extends from the mold steel 12 to the inside (building side). This fixing is preferably welding by welding, but may be fixing by screws or the like.
The stud 20 may be a headed stud.

In FIG. 3, the waterproof sheet 30 is attached to the inner wall surface 10 a of the soil cement wall body 10.
The waterproof sheet 30 is affixed to the joint surface 42 (vertical joint surface Y in this figure) of the concrete underground wall 40 or the inner wall surface 10a facing the joint before the underground wall 40 is constructed.
The connection surface 42 is a horizontal connection surface X extending in the horizontal direction or a vertical connection surface Y extending in the vertical direction. The joint not shown is a vertical joint extending in the vertical direction.

The waterproof sheet 30 is a belt-like rubber sheet that extends along the joining surface 42 and can be bonded to the soil cement wall 10. The water stop sheet 30 is a non-vulcanized butyl rubber sheet, for example.
Moreover, the water stop sheet 30 has a predetermined water stop width. The water stop width of the water stop sheet 30 has such a width that it can be in close contact with the underground wall 40 after construction to stop the joining surface 42. The thickness of the water stop sheet 30 is, for example, 1 to 3 mm, and the width is preferably 300 to 450 mm.

  In FIG. 3, the underground wall 40 is constructed using the inner wall surface 10 a of the soil cement wall body 10 as a mold frame, and a reinforcing bar 44 is connected to the stud 20.

FIG. 4 is an overall flow diagram of a construction method for constructing the synthetic underground outer wall 100, and FIG. 5 is an explanatory diagram of the construction method for constructing the synthetic underground outer wall 100.
In FIG. 4, the construction method of this invention has each step (process) of S1-S5.

In the wall formation step S1, as shown in FIG. 5 (A), a soil cement wall body 10 in which a plurality of steel bars 12 extending in the vertical direction and spaced apart from each other in the horizontal direction is embedded in the ground by an SMW method. To build. The mold steel 12 is preferably an H-shaped steel.
After the soil cement wall body 10 is created, the soil (ground) on the inside (building side) of the soil cement wall body 10 is removed, and the building side is discharged to form a cavity.

  In the mold steel exposure step S2, as shown in FIG. 5B, the inside of the soil cement wall body 10 is mechanically removed, and the inner surface (building side) of the mold steel 12 is exposed from the soil cement wall body 10. At this time, the inner wall surface 10 a of the soil cement wall body 10 is preferably formed flush with the exposed inner surface of the steel plate 12.

Next, in the stud fixing step S <b> 3, as shown in FIG. 5B, one end of the plurality of studs 20 extending inward from the inner wall surface 10 a of the soil cement wall body 10 is fixed to the mold steel 12.
This fixing is preferably welding by welding, but may be fixing by screws or the like.
The stud 20 is fixed to the mold steel 12 at a position other than the position where the water stop sheet 30 is attached.
The stud fixing step S3 may be performed after the sheet sticking step S4.

In the sheet sticking step S4, as shown in FIG. 5C, before the underground wall 40 is constructed, the inner wall surface 10a of the soil cement wall 10 facing the joint surface 42 or joints of the underground wall 40 is stopped. A waterproof sheet 30 having a water width is pasted.
The position of the joint surface 42 or joint of the underground wall 40 is set in advance. The pasting of the water blocking sheet 30 to the inner wall surface 10a is performed before the underground wall 40 is constructed at a preset position.

In the underground wall construction step S5, as shown in FIG. 5D, a concrete underground wall 40 having a joint surface 42 is constructed by connecting a reinforcing bar 44 to the stud 20 using the inner wall surface 10a as a mold. To do.
After construction of the underground wall 40, the waterproof sheet 30 is sandwiched between the soil cement wall body 10 and the underground wall 40, and adheres to the underground wall 40 to stop the joint surface 42.

The synthetic underground outer wall 100 and its construction method according to the present invention described above have the following characteristics.
(1) In underground excavation, the surface of the SMW is shaved, the steel plate 12 (H steel) in the SMW is exposed, a fixing gibber (stud 20) is attached to the H steel, and the inner wall 10a is used as a substitute for the formwork. 40 is constructed, and a predetermined stress is applied to the H-shaped steel.
(2) The water stop sheet 30 is provided corresponding to the horizontal joint surface X, the vertical joint surface Y, and the vertical joint of the underground wall 40 that is likely to cause a problem with water stoppage. Build up.
(3) For example, a non-vulcanized butyl rubber sheet (thickness: 1.5 mm) is used as the water blocking sheet 30 and is attached to the inner wall surface 10a of the soil cement wall body 10 before the underground wall 40 is constructed.

  According to the above-described embodiment of the present invention, the waterproof sheet is formed on the inner wall surface 10a of the soil cement wall 10 facing the joint surface 42 or joints of the concrete underground wall 40 before the underground wall 40 is constructed. 30 is affixed, and this water stop sheet 30 has a predetermined water stop width. The water-stop sheet 30 adheres to the joint surface 42 or joint of the underground wall 40 constructed thereafter by the pressure at the time of concreting placement, and stops the joint surface 42 or joint of the underground wall 40.

  Therefore, it is possible to easily stop the groundwater at the joint surface 42 or joint of the concrete, which is likely to cause a problem with water stoppage.

Moreover, since the water stop sheet 30 having a water stop width is used, the mold steel 12 of the soil cement wall body 10 is formed through the stud 20 to which the reinforcing bar 44 is connected in the most range excluding the water stop width. 40 and integrated. Thereby, a part of external force which acts on the underground wall 40 can be borne by the steel mold 12 of the soil cement wall body 10 via the stud 20.
Therefore, by integrating the steel plate 12 (H-shaped steel) in the soil cement wall body 10 (mountain wall) and the underground wall 40 of the post-casting, the stress load of the post-casting underground wall 40 can be reduced.

The above-mentioned mountain retaining wall (SMW) is a temporary structure provided to prevent the surrounding ground from collapsing during excavation. Conventionally, after the main body frame is completed, it is not used and removed. Or it was left in the ground.
In the present invention, the steel wall 12 (H-shaped steel) of the mountain retaining wall (SMW) is integrated with the underground wall 40 to form the synthetic underground outer wall 100, thereby reducing the thickness of the underground wall 40 and the amount of reinforcing bars, thereby reducing the cost. It is also possible to use the site effectively.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously, unless it deviates from the summary of this invention.

X horizontal transfer surface, Y vertical transfer surface, 1 underground,
10 soil cement wall (Yamadome wall), 10a inner wall surface,
11 soil cement pillar, 12 type steel (H type steel),
20 Stud (Stud with head), 30 Water-stop sheet,
40 underground wall, 42 joint surface, 44 rebar,
100 synthetic underground wall

Claims (6)

A soil cement wall body in which a plurality of steel bars extending vertically and spaced apart from each other in the horizontal direction are embedded in the ground,
One end is fixed to the mold steel exposed from the soil cement wall, and a plurality of studs extending inward from the mold steel;
A waterproof sheet attached to the inner wall surface of the soil cement wall body and having a predetermined waterproof width;
A concrete underground wall constructed with the inner wall surface as a mold and having a reinforcing bar connected to the stud,
The said water stop sheet | seat is a synthetic | combination underground outer wall currently affixed on the said inner wall surface of the said soil cement wall body facing the joint surface or joint of the said underground wall before construction of the said underground wall. The connection surface is a horizontal connection surface extending in the horizontal direction, or a vertical connection surface extending in the vertical direction,
The synthetic underground outer wall according to claim 1, wherein the joint is a vertical joint extending in a vertical direction. The water-stop sheet is a belt-like rubber sheet that extends along the joint surface and can be bonded to the soil cement wall body,
2. The synthetic underground outer wall according to claim 1, wherein the water stop width has a width that can be in close contact with the underground wall after construction to stop the joint surface.   The synthetic underground outer wall according to claim 1, wherein the stud is fixed to the mold steel at a position other than a position where the waterproof sheet is attached. A construction method for constructing the synthetic underground outer wall according to claim 1,
A sheet sticking step of attaching the water stop sheet having the water stop width to the inner wall surface of the soil cement wall body facing the joint surface and the joint of the underground wall before construction of the underground wall. A method for constructing a synthetic underground outer wall. (A) a wall body building step for creating the soil cement wall body in the ground, in which a plurality of the steel bars extending vertically at intervals from each other in the horizontal direction are embedded;
(B) a mold steel exposure step of exposing the mold steel from the soil cement wall;
(C) a stud fixing step of fixing one end of the plurality of studs extending inward from the inner wall surface of the soil cement wall body to the mold steel;
(D) An underground wall construction step of constructing the underground wall made of concrete having the joint surface by connecting a reinforcing bar to the stud using the inner wall surface as a formwork. Construction method of the synthetic underground outer wall.

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