JP4836276B2 - Water-stop structure of precast concrete wall and its construction method - Google Patents

Description

  The present invention relates to a precast concrete wall body that improves the water-stopping property between the precast concrete wall bodies and improves the joint strength in the wall for earth retaining with precast concrete (hereinafter also simply referred to as “precast concrete wall body”). The present invention relates to a water stop structure and its construction method.

  Conventionally, a precast concrete wall body that can be used as it is as a structural wall body has been used as a retaining wall body in place of temporary materials such as steel sheet piles from the viewpoints of rationalization of construction and shortening the construction period.

For example, in the following Patent Document 1, as shown in FIG. 11, a grout groove 52 is formed in the pile longitudinal direction on the adjacent surface of each precast concrete hollow pile 51 that constructs the precast concrete wall 50, and the precast concrete hollow pile 51 After the completion of the construction, the grouting groove 52 is filled with a water-stopping material 53 such as mortar grouting so that the precast concrete is designed to prevent inundation due to water pressure from the outer surface of the precast concrete wall 50 (precast concrete hollow pile 51). A wall water stop structure is disclosed.
JP-A-11-36334

  However, in the water stop structure described in Patent Document 1 above, when filling the grout groove with the water stop material after the completion of the precast concrete hollow pile, the adhesiveness between the water stop material and the grout groove surface is taken into consideration. Thus, it is desirable that the surface of the grout groove be roughened, but there is a problem that soil or the like tends to adhere to the surface of the grout groove, and sufficient adhesion strength cannot be secured. In addition, because of the infiltration of a modifier (hereinafter referred to as “stabilizer”) that enhances the fluidity of the earth and sand and stabilizes the surrounding ground to facilitate construction, the grout grooves are not sufficiently cleaned. This tends to reduce the integrity of the precast concrete wall bodies. Furthermore, if the adhesion strength between the grout material and the precast concrete wall and the joint strength between the precast concrete walls are not sufficient, external forces such as tensile force, shearing force and bending stress are applied between the precast concrete walls after construction. In such a case, there was a problem that water leakage occurred due to cracks in the water stop material.

  Therefore, the main problem of the present invention is to integrate the grout material and the precast concrete wall body, have excellent water-stopping performance between the precast concrete wall bodies, and further have a water-resistant structure of the precast concrete wall body having high resistance to external force and It is to provide the construction method.

As the present invention according to claim 1 in order to solve the above problems, in the opposite side of phase adjacent precast concrete wall, which has a buried one side joined bracket to the side of one of the pre-cast concrete wall, the one The side joining metal fittings are L-shaped pieces facing inward, and the L-shaped pieces are spaced apart in the thickness direction of the wall body and arranged in two strips along the longitudinal direction of the member, and are connected at the lower end. It is buried in the three-sided arrangement of the left side, right side and bottom side in front view,
The other side joint metal fitting is embedded in the side surface of the other precast concrete wall body, and the other side joint metal fitting is an L-shaped piece facing outward, and the L-shaped piece is separated in the thickness direction of the wall body. 2 are arranged along the longitudinal direction of the member with a gap between them, connected at the lower end, and embedded in a three-sided arrangement of the left side, the right side and the lower side in front view,
A space closed from the periphery is formed by the engagement of the one side joint fitting and the other side joint fitting at the three sides ,
In the cut-off space, a concave groove facing the longitudinal direction of the member is formed in the precast concrete wall body, and a water stop plate is inserted and installed across the concave grooves, and a grout material is placed in the cut-off space. A water-stopping structure for a precast concrete wall characterized by being filled is provided.

  In the first aspect of the present invention, on the opposite side surfaces of the adjacent precast concrete wall bodies, the one side joint fitting embedded in the side surface of one precast concrete wall body and the other side surface of the precast concrete wall body are embedded. A space closed from the periphery is formed by the engagement with the other-side joint fitting. In the cut-off space, a concave groove facing the longitudinal direction of the member is formed in the precast concrete wall body, and a water stop plate is inserted and installed across the concave grooves, and a grout is placed in the cut-off space. The material is filled.

  Therefore, the engagement between the one-side joining bracket and the other-side joining bracket greatly improves the engagement force between the precast concrete wall bodies, and the waterproof structure of the strong precast concrete wall body that integrally resists external force. In addition, it is possible to ensure the installation accuracy.

  In addition, since the grout filling portion is a space closed from the periphery by the engagement of the one side joining bracket and the other side joining bracket, to prevent the intrusion of the stabilizer and to enable sufficient cleaning, It is possible to eliminate adhesion of soil and the like, and to secure adhesion and integrity between the grout material and the precast concrete wall.

  Furthermore, the grout material is filled in the concave groove, and the water stop plate inserted and installed between the concave grooves can ensure a reliable water stop by the water stop plate even if a crack or the like enters the grout material. It becomes possible to enhance the water stop effect after in-service.

  As the present invention according to claim 2, there is provided a water stop structure for a precast concrete wall body according to claim 1, wherein the surface of the concave groove is roughened.

  In the second aspect of the invention, the surface in the concave groove is roughened. The grout filling section is a cut-off space, which prevents the ingress of stabilizers and allows for sufficient cleaning, so even if the surface is roughened, there is no adhesion of soil etc., and the grout and precast concrete walls High adhesion to the body can be ensured.

As the present invention according to claim 3, there is provided a water stop structure for a precast concrete wall according to any one of claims 1 and 2 , wherein the concave groove has a substantially trapezoidal cross section that is narrow at the opening.

In the third aspect of the invention, the cross-sectional shape of the concave groove is a substantially trapezoidal cross-section with a narrow width at the opening, so that, as will be described later, a substantially U-shaped cross-section that closes the opening of the concave groove ( The concave groove is easily formed by an opening closing member (both side walls are widened) and a rubber tube that is inserted into the concave groove and holds the opening closing member in the opening of the concave groove by inflation by air pressure insertion. It becomes possible to occlude.

As this invention which concerns on Claim 4, it is embed | buried in the side surface of the one side precast concrete wall body, the other side of the precast concrete wall body, and the one side joining metal fitting embed | buried in the side surface of one precast concrete wall body. A space that is cut off from the periphery at a predetermined position is formed by engagement with the other side fitting, and the precast concrete wall is opposed to the precast concrete wall along the longitudinal direction of the member and is narrow at the opening. And a water stop structure of a precast concrete wall in which a groove plate having a substantially trapezoidal cross section is formed, a water stop plate is inserted and installed between the concave grooves, and a grout material is filled in the cut-off space A construction method for
Before the precast concrete wall is installed, the concave groove is provided with an opening closing member that closes the opening of the concave groove, and the opening blocking member is inserted into the concave groove and expanded by air pressure insertion. A preparatory step of closing the concave groove with a rubber tube held in the opening of
A first step of building the preceding precast concrete wall in the excavation trench;
A second step of building a succeeding precast concrete wall while engaging the joint metal fittings;
A third step of removing the rubber tube and the opening closing member after degassing the air of the rubber tube;
A fourth step of cleaning the interior of the cut-off space by the joint fitting;
A fifth step of inserting and installing a water stop plate across the concave grooves;
There is provided a precast concrete wall construction method characterized by comprising a sixth step of filling the cut-off space with a grout material.

The invention described in claim 4 prescribes a method for constructing a precast concrete wall, and in particular, in advance, the concave groove of the preceding precast concrete wall and the concave groove of the precast concrete wall that follows. Each of the concave grooves is closed by an opening closing member that closes the opening of the concave groove, and a rubber tube that is inserted into the concave groove and holds the opening closing member in the opening of the concave groove by expansion by air pressure. Since the rubber tube and the opening closing member are removed after the construction, soil or the like does not enter the concave groove, and the integrity with the grout material can be secured. In addition, since the soil or the like does not enter the concave groove having the roughened surface, the cleaning operation in the cut-off space in the fourth step can be greatly simplified.
In the present invention according to claim 5, the one-side joining metal fitting is an L-shaped piece facing inward, and the L-shaped piece is spaced apart in the thickness direction of the wall body and is formed in two strips along the longitudinal direction of the member. In addition to being arranged at the lower end, it is embedded in a three-sided arrangement of the left side, the right side, and the lower side in a front view, and the other side fitting is an L-shaped piece facing outward, and this L-shaped piece is a wall Two strips are arranged along the longitudinal direction of the member with a separation in the thickness direction of the body, connected at the lower end, and embedded in a three-sided arrangement of the left side, the right side and the lower side in front view, The construction method of the precast concrete wall body of Claim 4 in which the said cutoff space is formed when the other side joining metal fitting engages with the said three sides.

  As described above in detail, according to the present invention, the grout material and the precast concrete wall body are integrated, the water stoppage between the precast concrete wall bodies is excellent, and the precast concrete wall body having a high resistance to external force is also retained. A water structure can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Structure of precast concrete wall]
FIG. 1 shows a precast concrete wall structure 1 according to the present invention, in which (A) is a plan view, (B) is a front view, and (C) is a side view. FIG. 2 is a sectional view taken along the line II-II, and FIG. 3 is an enlarged plan view of the connecting portion showing the precast concrete wall bodies 2A and 2B before construction.

  As shown in FIG. 1, the precast concrete wall structure 1 shown in this embodiment is constructed in a row by sequentially connecting a plurality of precast concrete walls 2, 2,... The plate 4 and the like are directly connected. In the illustrated example, a plurality of steel piles 3, 3... Are provided so as to protrude from the lower end surface, but the presence or absence of a pile body is arbitrarily determined depending on the structural conditions.

  As shown in FIG. 1 to FIG. 3, the water stop structure of the precast concrete wall 2 is embedded in the side surface of one precast concrete wall body 2 </ b> A on the opposite side surfaces of the adjacent precast concrete wall bodies 2 </ b> A and 2 </ b> B. Further, a space 9 closed from the periphery is formed by the engagement between the one-side joining metal fitting 5A and the other-side joining metal fitting 5B embedded in the side surface of the other precast concrete wall 2B. Concave grooves 6 facing the longitudinal direction of the member are formed in the concrete walls 2A and 2B, and a water stop plate 10 is inserted and installed across the concave grooves 6 and 6, and a grout is placed in the cut-off space 9. The material 8 is filled.

The following is a detailed description.
The precast concrete wall bodies 2 and 2 are connected to the connecting surface (opposite side surface) with a joining member 5A embedded in the preceding precast concrete wall body 2A and a joining member 5B embedded in the following precast concrete wall body 2B. And. The joining member 5A formed on the preceding precast concrete wall 2A is an L-shaped piece facing inward on the side surface of the precast concrete wall 2A, and the L-shaped piece is spaced apart in the thickness direction of the wall. Are arranged along the longitudinal direction of the member, are connected at the lower end, and are embedded in a three-sided arrangement of the left side, the right side, and the lower side in a front view, and the recess 7 between the two L-shaped pieces. Is done. Further, the joining member 5B formed on the following precast concrete wall 2B is an L-shaped piece facing outward on the side surface of the precast concrete wall 5B, and this L-shaped piece extends in the thickness direction of the wall. Two strips are arranged along the longitudinal direction of the member with a space between them, connected at the lower end, and embedded in a three-sided arrangement of the left side, the right side, and the lower side in a front view.

  In the state where the precast concrete wall bodies 2 and 2 are sequentially built, the joining members 5A and 5B of the adjacent precast concrete wall bodies 2 and 2 are engaged to form a cut-off space 9 that is cut off from the periphery. It has come to be.

  In this cut-off space 9, concave grooves 6 and 6 are formed in the precast concrete wall bodies 2 and 2 so as to face each other in the longitudinal direction of the member. The concave groove 6 preferably has a substantially trapezoidal cross section with a narrow width at the opening, and the bottom and both side surfaces have a rough surface finish (gray surface finish).

  The water stop plate 10 inserted and installed between the concave grooves 6 and 6 includes a plate-like portion 10a and cylindrical portions 10b and 10b fixed to both ends of the plate-like portion 10a in the illustrated example. In addition, a rod such as a reinforcing bar is inserted into the cylindrical portion 10b so as to be self-supporting. The material can be a rubber material or a synthetic resin material. As shown in FIG. 4 (A), spacers 11 are fitted on the cylindrical portion 10b at appropriate intervals in the height direction, and are installed at substantially the center of the concave grooves 6 and 6.

  Then, the grout material 8 is filled in the cut-off space 9 that is cut off by the joint fittings 5A and 5B, so that the grout material 8 and the precast concrete wall bodies 2 and 2 are integrated, and the precast concrete wall body. A water-stopping structure of a precast concrete wall body having excellent water-stopping capacity between 2 and 2 and high resistance to external force can be obtained.

[Precast concrete wall construction method]
Next, the construction method of the said precast concrete wall body is explained in full detail based on FIGS.

  First, as shown in FIG. 5, the concave groove 6 of the preceding precast concrete wall body 2A and the concave groove 6 of the following precast concrete wall body 2B are respectively provided in advance from the inner surface side. An opening closing member 20 having a substantially U-shaped cross-section (both side walls are widened) that closes the opening 6a, and the opening closing member 20 inserted into the recessed groove 6 and expanded by air pressure insertion. The concave groove 6 is closed with the rubber tube 21 held in the opening 6a. This makes it possible to suppress the entry of soil or the like into the concave groove 6 when the precast concrete wall 2 is installed.

  Then, as the first step of the construction procedure, as shown in FIG. 5, the preceding precast concrete wall 2 is built in the excavation groove with the opening closing member 20 held in the opening 6 a of the concave groove 6. . In this case, a low-strength solidified body such as bentonite-based solidified material or the like is attached to the inside of the L-shaped piece of the joining member 5A of the preceding precast concrete wall 2A so that soil or the like does not adhere when the precast concrete wall 2 is installed. It is preferable to fill with a filler 22 made of an easily destructible material such as resin.

  Next, as shown in FIG. 6, as the second step, the opening closing member 20 is held in the opening 6 a of the concave groove 6, and then followed by the joining member 5 </ b> A of the preceding precast concrete wall 2 </ b> A. The following precast concrete wall 2B is built while engaging the joining member 5B of the precast concrete wall 2B. When the precast concrete wall 2B has been installed, a cut-off space 9 cut off from the periphery by the joining members 5A and 5B is formed on the connection surface (opposite side surface).

  As a third step, as shown in FIG. 7, the air in the rubber tube 21 is removed, and the rubber tube 21 and the opening closing member 20 are removed from the concave groove 6. Thus, a grout material filling space is formed inside the joining members 5A and 5B together with the concave grooves 6 and 6.

  As a fourth step, as shown in FIG. 8, the interior of the cut-off space 9 is washed by water jet or the like to completely remove soil and the like. Here, as described above, when the precast concrete wall is installed, the concave groove 6 is provided with the opening closing member 20, so that dirt or the like almost penetrates into the concave groove 6 subjected to the rough surface finish. In addition, it is cut off from the surroundings by the joining members 5A and 5B and the infiltration of the stabilizer is prevented, so that the cleaning operation is greatly improved.

  Next, as a fifth step, as shown in FIG. 9, the water stop plate 10 is inserted and installed across the concave grooves 6 and 6.

  Thereafter, as a sixth step, the grout material 8 is filled into the cut-off space 9 as shown in FIG. Here, in order to fill the cutout space 9 with the grout material 8, it is desirable to gradually fill from the lower side of the cutout space 9.

1 shows a precast concrete wall structure 1 according to the present invention, (A) is a plan view, (B) is a front view, and (C) is a side view. It is the II-II arrow directional view. It is an enlarged plan view of a connecting portion showing precast concrete wall bodies 2A, 2B before erection. FIG. 4A is a plan view showing the installed state of the water stop plate 10, and FIG. 4B is a view taken along the line IV-IV in FIG. 2. It is a top view of the precast concrete wall which shows the construction procedure (the 1) of a precast concrete wall. It is a top view of the precast concrete wall which shows the construction procedure (the 2) of a precast concrete wall. It is a top view of the precast concrete wall which shows the construction procedure (the 3) of a precast concrete wall. It is a top view of the precast concrete wall which shows the construction procedure (the 4) of a precast concrete wall. It is a top view of the precast concrete wall which shows the construction procedure (the 5) of a precast concrete wall. It is a top view of the precast concrete wall which shows the construction procedure (the 6) of a precast concrete wall. The conventional precast concrete wall structure is shown, (A) is a top view, (B) is a front view, (C) is a CC line arrow view of (A).

  DESCRIPTION OF SYMBOLS 1 ... Precast concrete wall structure, 2A * 2B ... Precast concrete wall body, 3 ... Steel pile, 4 ... Floor slab, 5A * 5B ... Joining member, 6 ... Concave groove, 7 ... Recessed part, 8 ... Grout material, 9 ... Cut-off space, 10 ... Water stop plate, 11 ... Spacer, 20 ... Opening closing member, 21 ... Rubber tube

Claims (5)

On the opposite side surface of the adjacent precast concrete wall body, and having one side joint fitting embedded in the side surface of one precast concrete wall body, the one side joint fitting is an L-shaped piece facing inward, This L-shaped piece is spaced apart in the thickness direction of the wall body and arranged in two strips along the longitudinal direction of the member, connected at the lower end, and embedded in a three-sided arrangement of the left side, right side, and lower side in front view,
The other side joint metal fitting is embedded in the side surface of the other precast concrete wall body, and the other side joint metal fitting is an L-shaped piece facing outward, and the L-shaped piece is separated in the thickness direction of the wall body. 2 are arranged along the longitudinal direction of the member with a gap between them, connected at the lower end, and embedded in a three-sided arrangement of the left side, the right side and the lower side in front view,
A space closed from the periphery is formed by the engagement of the one side joint fitting and the other side joint fitting at the three sides ,
In the cut-off space, a concave groove facing the longitudinal direction of the member is formed in the precast concrete wall body, and a water stop plate is inserted and installed across the concave grooves, and a grout material is placed in the cut-off space. Water-preserving structure of precast concrete wall characterized by being filled.   The water stop structure of a precast concrete wall according to claim 1, wherein the surface in the concave groove is roughened. The concave groove, the water stopping structure of precast concrete wall according to any one of claims 1-2 which is substantially trapezoidal cross-section which is narrow at the opening. Engagement between one side joint fitting embedded in one side of the precast concrete wall and the other side joint fitting buried in the side surface of the other precast concrete wall on the opposite side surfaces of the adjacent precast concrete wall bodies A space that is closed from the periphery is formed at a predetermined position, and a concave groove having a substantially trapezoidal cross section that is opposed to the precast concrete wall along the longitudinal direction of the member and is narrowed at the opening is formed in the cutoff space. It is a construction method for a water stop structure of a precast concrete wall body that is formed and a water stop plate is inserted and installed across these concave grooves, and is filled with a grout material in the cut-off space,
Before the precast concrete wall is installed, the concave groove is provided with an opening closing member that closes the opening of the concave groove, and the opening blocking member is inserted into the concave groove and expanded by air pressure insertion. A preparatory step of closing the concave groove with a rubber tube held in the opening of
A first step of building the preceding precast concrete wall in the excavation trench;
A second step of building a succeeding precast concrete wall while engaging the joint fittings;
A third step of removing the rubber tube and the opening closing member after degassing the air of the rubber tube;
A fourth step of cleaning the interior of the cut-off space by the joint fitting;
A fifth step of inserting and installing a water stop plate across the concave grooves;
A construction method of a precast concrete wall body comprising: a sixth step of filling a grout material in the cut-off space. The one-side joint fitting is an L-shaped piece facing inward, and the L-shaped pieces are spaced apart in the thickness direction of the wall body and arranged in two strips along the longitudinal direction of the member, and connected at the lower end. Embedded in a three-sided arrangement of the left side, the right side, and the lower side in a front view, and the other side fitting is an L-shaped piece facing outward, and the L-shaped piece is spaced apart in the thickness direction of the wall. Two strips are arranged along the longitudinal direction of the member, connected at the lower end, and embedded in a three-sided arrangement of the left side, the right side, and the lower side in a front view. The construction method of the precast concrete wall body of Claim 4 in which the said deadline space is formed by engaging by.

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