JP2002013135A - Structure of connection part of underground wall panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structure of a connection part of an underground wall panel with a high water cut-off property to prevent water from leaking to the internal surface of an underground continuous wall. SOLUTION: A water cut-off member 14 is disposed across the connected end parts 10a and 12a of underground wall panels 10 and 12 connected to each other so as to form the underground continuous wall 1 through the vertical entire range of the connected end parts 10a and 12a. A water expansible rubber 16 expanded by the reaction with water is installed on the surface of the water cut-off member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of an underground wall panel forming an underground continuous wall.

[0002]

2. Description of the Related Art Underground diaphragm walls are formed with preceding excavation grooves at predetermined intervals in the construction direction, and concrete is poured into the excavation grooves to construct preceding underground wall panels. A trailing excavation trench is formed adjacently, and then a concrete wall is poured into the excavation trench to construct a trailing underground wall panel, whereby a continuous wall surface is constructed inside the ground.

At this time, prior to concrete placement of the preceding ground wall panel, a cylindrical interlocking pipe is installed at the end of the preceding excavation groove to join the preceding ground wall panel and the following ground wall panel. The end is formed into a curved surface, or the joint end of the preceding underground wall panel, which is a flat surface formed by installing a rectangular tubular interlocking pipe, is cut and formed into an uneven shape. The wall panels are joined so that no gap is generated between them.

[0004]

However, at the joint of two underground wall panels which are not simultaneously driven but have different concrete placing conditions, changes in soil retention and relative displacement between the independent underground wall panels. This may cause cracks between the joining ends. Then, when a crack occurs at the joint end of the underground wall panel, there is a problem that groundwater existing outside the underground continuous wall enters through the crack and leaks into the underground continuous wall.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a joint structure of an underground wall panel having a high waterproof property for preventing water leakage to the inner surface of an underground continuous wall. Aim.

[0006]

In order to achieve the above object, a joint structure of an underground wall panel according to a first aspect of the present invention is a joint structure of an underground wall panel forming an underground continuous wall. And a water leakage path provided between the joining ends of the underground wall panels to be joined and over the entire vertical direction of the joining ends, and penetrating from between the joining ends of the underground wall panels. And a water blocking member for shutting off water.

That is, at the joint between the two underground wall panels to be joined, a water-stopping member is disposed across the joint end of the two, and the water-stopping member extends over the entire vertical range of the joint end. Cracks occur between the joints of the underground wall panels, and even if groundwater or the like enters the cracks, the groundwater is cut off by the water-stopping member and is directly connected to the ground. Leakage inside the wall can be prevented. In addition, since water leaked from the cracks between the joint ends is guided along the surface, the water leak path is extended, and thus, the water leaks into the underground continuous wall by the length of the water leak path. Can be suppressed.

In the joint structure of the underground wall panel according to a second aspect, a water-swellable rubber which expands in response to the water is provided on the surface of the water-stopping member. That is, since the water infiltrating rubber is provided on the surface of the water stopping member through which the water that has penetrated into the crack at the joint of the underground wall panel is guided, the water penetrates from the crack generated at the joint of the underground wall panel. The water is guided to the water-stopping member and travels along its surface to reach the water-swellable rubber. Then, the water-swellable rubber expands by reacting with the infiltrated water, enters into the cracks and gaps with the concrete and closely adheres to fill the cracks, etc. Do not enter. Therefore, it is possible to prevent water leakage to the inner surface side of the underground wall panel, and it is possible to form an underground continuous wall having high water stoppage.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5 show one embodiment of the joint structure of the underground wall panel of the present invention, FIG. 1 is a plan view showing the joint structure of the underground wall panel of the present invention, and FIG. 3 (a) is an enlarged view of FIG. 2, (b) is a side view of (a), and FIG. 4 is the present invention. 5A to 5F are plan views showing a method of constructing a continuous underground wall suitable for the joint structure of the underground wall panel of FIG. It is a side view which shows a locking pipe.

The joint structure of the underground wall panels according to the present embodiment extends between the joint ends 10a and 12a of the two underground wall panels 10 and 12 to be joined, and the two underground wall panels 1 and 2 are joined together.
A water stop plate 14 made of a steel plate serving as a water stop member is buried throughout the vertical range of 0 and 12. Water-swellable rubber 16 is provided on both sides of the water-stop plate 14 to expand by reacting with water.

In order to bury the waterproof plate 14 provided with the water-swellable rubber 16, of the underground wall panels 10, 12, which are to be previously driven, for convenience of construction. A groove 10b extending from the upper end to the lower end of the panel 10 is formed at the joint end 10a of the panel 10 in the vertical direction. The joint end 12a of the following underground panel 12 has a protrusion that enters the groove 10b. A portion 12b is formed.

More specifically, the underground continuous wall 1 of the present embodiment will be described.
Is constructed in substantially the same manner as a conventional construction method of a continuous underground wall using a cylindrical interlocking pipe. For this reason, the joint surface between the preceding underground wall panel 10 and the following underground wall panel 12 has a horizontal section whose half is the width of the excavation groove 20 a for driving the underground continuous wall 1. It is formed in an arc shape. Further, an interlocking pipe 2 to be described later is attached to the joint end 10a of the preceding underground wall panel 10.
The groove 10b is provided at the center of the excavation groove 20a in the width direction by the two dowels 22a. This groove 1
0b has a depth along the panel surface from the joint end portion 10a of the underground wall panel 10 and is provided over the entire range in the vertical direction, and the width of the excavation is such that the strength of the wall surface is not reduced. It is formed sufficiently narrower than the width of the groove 20a.

The water stop plate 14 has a width sufficiently larger than the depth of the groove 10b and is formed longer than the height of the underground wall 1 to be formed. It is thick enough to block the flow of water that has penetrated the cracks. At this time, the water stop plate 14 is shown in FIG.
As shown in FIG. 3, a plurality of plate members are formed by welding or the like via a connection plate 14c.

A water-swellable rubber 16 is bonded or welded to both surfaces of the water stop plate 14 along the longitudinal direction. At this time, the water-swellable rubber 16 is placed at one end in the width direction of the water-stop plate 14 so that the water-swellable rubber 16 enters the groove 10 b of the preceding underground wall panel 10 together with the water-stop plate 14. It is provided so as to be biased toward the side 14a, and is formed so that the entire thickness is smaller than the width of the groove 10b in a state where the water-swellable rubber 16 is attached to the water stoppage plate 14.

The water stop plate 14 is made of the water-swellable rubber 1.
The end 14a on the side provided with 6 is disposed so as to abut against the bottom 10c of the groove 10b, and the other end 14b protrudes greatly from the groove 10b and is provided with the following underground wall panel 12
And the periphery thereof is filled with concrete 12c forming the following underground wall panel 12. That is, the water blocking plate 14 and the water-swellable rubber 16 are embedded in the protruding portion of the following underground wall panel 12.

The method of constructing the underground continuous wall 1 is as follows.
The preceding excavation grooves 20a are formed at predetermined intervals in the construction direction. A substantially cylindrical interlocking pipe 22 is installed at the end of the preceding excavation groove 20a. The interlocking pipe 22 used here is a conventional cylindrical interlocking pipe having a diameter equal to the width of the digging groove 20a.
It comprises a dowel 22a projecting diametrically from one side thereof and formed along the length thereof, so that the dowel 22a is directed inward of the preceding excavation groove 20a and is parallel to the wall surface to be formed. Are located in

Then, concrete is poured into the preceding excavation groove 20a to construct the preceding underground wall panel 10, and after the concrete is hardened, the interlocking pipe 22 is removed. At this time, a groove 10b is formed in the joint end 10a of the preceding underground wall panel 10 along the depth direction.

Next, a trailing excavation groove 20b is formed adjacent to the preceding underground wall panel 10. Thereafter, the water stop plate 14 provided with the water-swellable rubber 16 in advance in the groove 10b of the preceding underground wall panel 10 has its end 14a abutting against the bottom 10c of the groove 10b and the water-swellable rubber 16 is attached to the groove 10b. 1
0b. Next, trailing excavation trench 2
Subsequent underground wall panel 1 by placing concrete in 0b
By constructing 2, a continuous wall surface is constructed inside the ground. At this time, the water stop plate 14 is disposed across the joint end portions 10a and 12a of the two underground wall panels 10 and 12 formed in an arc shape by the interlocking pipe 22.

According to the joint structure of the underground wall panels of the above-described embodiment, the joint between the two underground wall panels 10 and 12 to be joined is provided with the water stop over the joint ends 10a and 12a of both. A plate 14 is arranged, and this water stop plate 14 is
0a, 12a, the cracks are formed between the joints between the two underground wall panels 10, 12, and even if groundwater or the like enters the cracks, the cracks occur. The groundwater is blocked by the water stop plate 14 and can be prevented from leaking directly into the underground continuous wall 1.

Further, the water leaking from the crack between the joining ends 10a and 12a is guided along the surface, so that the water leakage path is extended. Water leakage to the inside of the wall 1 can be suppressed.

Further, water that has penetrated from the cracks is guided and water-swellable rubber 16
Water penetrating from cracks generated at the joints of the underground wall panels 10 and 12 is guided to the water stop plate 14 and travels along the surface thereof to reach the water-swellable rubber 16. . Then, the water-swellable rubber 16 reacts with the infiltrated water to expand and close the water leakage path, so that water does not enter the water-swellable rubber first. Therefore, it is possible to prevent water leakage to the inner surface side of the underground wall panels 10 and 12, and to form the underground continuous wall 1 having high water stopping property.

According to the method for constructing the underground continuous wall 1 of the above embodiment, the dowel 2 is attached to the interlocking pipe 22.
Since the groove 2a is provided, the groove 10b can be formed in advance in the preceding underground wall panel 10, and the water stop plate 14 is disposed across the groove 10b and the trailing excavation groove 20b, and the trailing underground wall is provided. Since the wall panel 12 is cast, the water blocking plate 14 can be reliably provided between the joint ends 10a, 12a of the underground wall panels 10, 12. In addition, since the water stop plate 14 is merely provided along the groove 10b, the water stop plate 14 can be easily embedded in the underground continuous wall 1 without the need for positioning and complicated fixing work of the water stop plate 14.

Further, the water stop plate 14 is connected to the preceding underground wall panel 1.
The water-swellable rubber 16 can be embedded in the underground continuous wall 1 simply by disposing it in the zero groove 10b. Therefore,
The underground continuous wall 1 having high waterproofness can be extremely easily constructed.

In the above embodiment, the water stop plate 14 is a steel plate, but may be formed of a resin material such as FRP.
In the above embodiment, the water-swellable rubber 16 is provided on both surfaces of the water-stop plate 14. However, the water-swellable rubber 16 is provided on one surface of the water-stop plate 14 as shown in FIG. , And also, as shown in FIG.
A water-swellable rubber 16 may be provided via a fixing plate 14c.

Further, it is not always necessary to provide the water-swellable rubber 16, and even if only the water-stopping plate 14 is provided as shown in FIG. 8, the water-stopping effect can be obtained by extending the water leakage path. it can. Further, as shown in FIG. 9, when a round steel member 24 or the like welded to the surface of the water stop plate 14 is provided,
The water leakage path along the surface of the round steel material 24 is cut off, and the water leakage path is further extended by the circumference of the round steel member 24, so that the water stopping effect can be enhanced.

[0026]

As described above, in the joint structure of the underground wall panel according to the first aspect, the water blocking member is provided at the joint of the two underground wall panels to be joined so as to straddle the joining end of the two. Since the water stop member is provided over the entire vertical range of the joint end, even if groundwater or the like enters the crack, the groundwater is blocked by the water stop member and directly Leakage inside the middle continuous wall can be prevented.
In addition, since water leaking from the cracks between the joining ends is guided along the surface, the path of the water leak is extended, and water leaking into the underground continuous wall can be suppressed.

In the joint structure of the underground wall panel according to the second aspect of the present invention, since the water-swelling rubber is provided on the surface of the water-stopping member serving as a water leakage path for the infiltrated water, the water reaching the water-swelling rubber is provided. Does not penetrate beyond it, and it is possible to form an underground continuous wall having high water stoppage.

[Brief description of the drawings]

FIG. 1 is a plan view showing a joint structure of an underground wall panel of the present invention.

FIG. 2 is a side view showing a water-stopping member and a water-swellable rubber used for a joint portion of an underground wall panel.

3A is an enlarged view of FIG. 2, and FIG. 3B is a side view of FIG.

FIG. 4 is a plan view showing a construction method of a continuous underground wall in the order of (a) to (f).

FIG. 5 is a side view showing an interlocking pipe used for construction of a continuous underground wall.

FIG. 6 is a plan view showing a first modification of the joint structure of the underground wall panel.

FIG. 7 is a plan view showing a second modification of the joint structure of the underground wall panel.

FIG. 8 is a plan view showing another embodiment of the joint structure of the underground wall panel.

FIG. 9 is a plan view showing a modification of another embodiment of the joint structure of the underground wall panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground continuous wall 10, 12 Underground wall panel 10a, 12a Joint end part 14 Water stop board (water stop member) 16 Water expandable rubber

Claims (2)

[Claims] 1. A joint structure of an underground wall panel forming an underground continuous wall, wherein the underground wall panel spans between joint ends of an underground wall panel to be joined and extends over the entire vertical direction of the joint end. A joint structure for an underground wall panel, comprising: a water-stopping member provided over the underground wall panel and blocking a path of water leaking from between joint ends of the underground wall panel. 2. The joint structure of an underground wall panel according to claim 1, wherein a water-swellable rubber which expands in response to the water is provided on a surface of the water-stopping member.