JP2007332724A - Method of constructing impervious wall, and method of preventing liquefaction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sufficient water stop measure in a construction method cutting a natural ground by a flexible cutting tool such as a wire saw and inserting steel plate and the like into a cut portion. <P>SOLUTION: A guide pipe in which the flexible cutting tool such as the wire saw is inserted is installed along the periphery of a planned structure. The flexible cutting tool such as the wire saw is inserted over two adjacent guide pipes, thereby cutting the guide pipes and the natural ground between those. A water-stopping steel plate or sheet material formed with a joint at a side portion is inserted in a cut portion, and connected to the water-stopping steel plate or sheet material previously inserted using the joints in the guide pipe. The water-stopping steel plate or sheet material is installed along the periphery of the planned structure. In this construction method, the connecting portion of the joints in the guide pipe is filled with plastic material to stop water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a construction method and a liquefaction inhibiting method for preventing a liquefaction when a ground is cut using a wire saw or a chain saw when a structure is built under a vehicle traveling path or the like.

  When building an underground structure under a vehicle traveling road, etc., in order to prevent the water level in the ground from dropping, for example, a chemical solution is injected into the ground, or the ground and solidified material are mixed to stop the ground. There was watering. FIG. 11 is a diagram for explaining this construction method. Reference numeral 1 denotes a chemical solution injection portion, in which a chemical solution is injected so as to surround the structure 2 to be constructed, the water is stopped, and the structure 2 is constructed by excavating the inside. It was.

By the way, in recent years, as a method of constructing an intersection structure under a vehicle traveling road, etc., as a method of giving little deformation to the track and the road surface, the ground is cut using a wire saw or a chain saw, and the cutting part is A construction method in which a protective steel plate is inserted to form a retaining member is known (Patent Document 1).
JP 2004-204624 A

  Although the construction method of Patent Document 1 is excellent in protecting the natural ground, it is necessary to stop water at the time of cutting using a wire saw or a chain saw, when inserting a steel plate, but the countermeasure is not always sufficient, The improvement was desired.

The present invention is intended to solve the above problems, and aims to provide sufficient water stoppage and liquefaction measures in a construction method in which a natural ground is cut with a wire saw or a chain saw and a steel plate or the like is inserted into the cut portion. To do.
Therefore, the present invention installs a guide tube for inserting a plastic cutting tool such as a wire saw along the outer periphery of the planned structure, and inserts a plastic cutting tool such as a wire saw across two adjacent guide tubes. Then cut the guide pipe and the ground between it, insert the water-stopping steel plate or sheet material with the joints formed on the side into the cutting part, and insert the water-stopping steel plate or sheet inserted in advance in the guide pipe In a construction method in which a water-stopping steel plate or sheet material is installed along the outer periphery of the planned structure by connecting the material and the joints, the connection part between the joints in the guide tube is filled with a plastic material to stop the water And
Moreover, this invention installs the guide tube which inserts plastic cutting tools, such as a wire saw, along the outer periphery of a plan structure, and inserts plastic cutting tools, such as a wire saw, across two adjacent guide tubes Then, cut the guide pipe and the ground between it and insert the water-stopping steel plate or sheet material with the water-stopping material on the upper and lower sides of the side part into the cutting part, and the upper and lower surfaces inserted in advance in the guide pipe In a construction method in which a water-stopping steel plate or sheet material is installed along the outer periphery of the planned structure facing the end of the water-stopping steel plate or sheet material with a water-stopping material attached to the guide tube, the water-stopping material is filled in the guide tube. It is characterized by stopping water.
Moreover, this invention installs the guide tube which inserts plastic cutting tools, such as a wire saw, along the outer periphery of a plan structure, and inserts plastic cutting tools, such as a wire saw, across two adjacent guide tubes Then cut the guide pipe and the ground between it, insert the water-stopping steel plate or sheet material with the joints formed on the side into the cutting part, and insert the water-stopping steel plate or sheet inserted in advance in the guide pipe In the construction method in which a water-stopping steel plate or sheet material is installed along the outer periphery of the planned structure by connecting the joints to the joints, waterstop packing should be installed around each end of each guide tube when the guide tube propulsion is completed It is characterized by.
Further, the present invention further inserts a water-stopping steel plate or sheet material by inserting a plastic cutting tool such as a wire saw across two adjacent guide tubes, cutting a guide tube and a ground between the guide tubes. It is characterized by installing a water-stopping packing at the cut end.
Moreover, this invention installs the guide tube which inserts plastic cutting tools, such as a wire saw, along the outer periphery of a plan structure, and inserts plastic cutting tools, such as a wire saw, across two adjacent guide tubes Then cut the guide pipe and the ground between it, insert the water-stopping steel plate or sheet material with the joints formed on the side into the cutting part, and insert the water-stopping steel plate or sheet inserted in advance in the guide pipe In a construction method in which a steel plate or a sheet material is installed along the outer periphery of the planned structure by connecting the materials and the joints, each steel plate is provided with a water stop member for stopping water between the guide tube 10 to be inserted by cutting. It is characterized by.
Moreover, this invention installs the guide tube which inserts plastic cutting tools, such as a wire saw, along the outer periphery of a plan structure, and inserts plastic cutting tools, such as a wire saw, across two adjacent guide tubes Then cut the guide pipe and the ground between it, insert the water-stopping steel plate or sheet material with the joints formed on the side into the cutting part, and insert the water-stopping steel plate or sheet inserted in advance in the guide pipe In a construction method in which water-resistant steel plates or sheet materials are installed along the outer periphery of the planned structure by connecting the material and joints, the guide tube and the cutting part that cuts the ground can be sandwiched and moved in the guide tube along with the cutting. A water stop ring for stopping the inside of the guide pipe is provided, and a submerged section in the guide pipe is limited between the water stop rings.
Further, the present invention constructs a water-impervious wall around the planned structure in the ground, interrupts the supply of groundwater to the inside by the water-impervious wall during and after the construction of the planned structure, It is characterized by suppressing the movement of the inner ground and suppressing the liquefaction of the ground.

  The present invention cuts the guide tube and the ground between them with a plastic cutting tool such as a wire saw, and inserts a water-stop steel plate or sheet material into the cutting part, Water stoppage can be adequately implemented by stopping water at the end of the guide tube or at the wall end, water stop between the guide tube and the steel sheet or sheet material, and the submersion section in the guide tube. Can be prevented.

Embodiments of the present invention will be described below. In addition, although a steel plate or a sheet (a civil engineering sheet knitted with nylon or the like, a rubber sheet, a plastic sheet, or the like) can be used as a water-stopping material for constructing a water-impervious wall, a description will be given below using a steel plate as an example.
FIG. 1 is a diagram for explaining a construction procedure in the construction method of a water-impervious wall. FIGS. 1 (a) and 1 (c) are side sectional views, and FIG. 1 (b) and FIG. 1 (d) are transverse sectional views. is there.
In order to construct a guide pipe made of a synthetic resin such as vinyl chloride for inserting a wire saw, a natural ground 7 between the starting shaft 5 and the reaching shaft 6 is drilled horizontally along the outer periphery of the planned structure. At this time, the water stop walls 8 are constructed on the wall surfaces of the both ends of the ground shaft 7 on the start shaft 5 and the reach shaft 6 side. Next, the guide tube 10 is constructed in each boring hole, and in the example shown in the figure, the guide tube 10 is constructed at a total of 10 locations of the four corners of the structure having a rectangular cross section and the intermediate positions of the upper and lower surfaces and both side surfaces ( FIG. 1 (b)).

  Next, the wire saw 11 is inserted across two adjacent guide tubes. As shown in FIG. 1 (c), the wire saw 11 includes a plurality of adjusting driven pulleys 12 and 13 for adjusting the direction change and the feeding length, and a driving pulley (see FIG. (Not shown). The endless wire saw 11 is a well-known one in which a large number of diamond bits are attached to a wire at an appropriate interval, and is known as a cutting tool for cutting reinforced concrete. In addition, it can replace with a wire saw and can also use flexible cutting tools, such as a chain saw.

  The driven pulley 13 at the tip of the wire saw 11 is connected to the tip of a steel plate 15 that is a water-stopping material having joints on both sides, and uses a traction steel wire 17 inserted in advance through a boring hole or a guide tube. Then, the steel plate 15 is pulled by the pulling jack 16 installed on the reaching shaft side, and the guide tube 10 and the ground between them are cut with a wire saw. The steel plate 15 is inserted into a cutting portion by a wire saw and is connected to an adjacent steel plate in the guide tube by a joint to construct a water shielding wall and reinforce the ground. FIG.1 (d) has shown the state by which the steel plate 15 was inserted in the upper and lower surfaces, and a part of side surface, and in the example of illustration, 10 steel plates were finally inserted along the outer periphery of a plan structure. The Therefore, the steel plate 15 having a width corresponding to the distance between the guide tube and the guide tube is used. In the above description, the drive device 6 is installed on the arrival shaft side, but it may be installed on the start shaft side. In this case, the driven pulley 13 at the tip of the wire saw is connected to the tip of the steel plate, The saw is wound so as to surround the steel plate 15, and is sequentially fed out along with the cutting.

FIG. 2 is a diagram for explaining connection between steel plates, FIG. 2 (a) is a plan view, FIG. 2 (b) is an enlarged view of a joint portion, and FIG. 2 (c) is a diagram for explaining simple joint connection using a rubber plate. FIG.
A fitting joint 20 for fitting is welded along the longitudinal direction on both sides of the steel sheet 15 to be inserted and constructed in the cutting part of the wire saw, and adjacent steel sheets are inserted using the existing steel sheet joint as a guide, Joints of adjacent steel plates are fitted and connected at the joint portion A in the guide tube. In addition, a simple joint using a rubber plate may be used for connection between steel plates. That is, as shown in FIG. 2 (c), the upper and lower rubber plates 22 are attached or adhered with bolts 23 so as to protrude from the steel plate side edge by a predetermined length along the side edge of one steel plate 15. An adjacent steel plate may be inserted and fitted between the rubber plates 22. In addition, when using a water-stop sheet | seat instead of a steel plate, a joint is attached to the both sides by adhesion | attachment, welding, or bolting etc., and adjacent sheets are connected.

FIG. 3 is a view for explaining water stoppage of a steel plate having a fitting-shaped joint.
As described above, the steel plate 15 is inserted while fitting a fitting joint into an existing steel plate joint in a guide tube and cutting the ground with a wire saw. A water-stopping plastic material 21 is filled. By doing in this way, it can prevent that a foreign material mixes into a joint part at the time of insertion of the steel plate in the ground, and can stop a joint part at the same time as fitting of an adjacent steel plate.

FIG. 4 is a view for explaining water stopping when a steel plate without a joint is used.
It is also possible to construct a water-impervious wall without providing a fitting like a fitting shape on the steel plate. In that case, as shown in the drawing, a water-stopping material, for example, a water-stopping rubber 25, is attached to the upper and lower surfaces of the end of the steel plate 15, inserted into the ground, and after installation, the steel plate is rolled up. The guide tube is filled with a water-stop material 26 such as a water-stop grout. At this time, the water stop rubber 25 can prevent water from flowing out from the guide tube cutting portion along the steel plate surface.

Next, the water stop at the construction stage such as when cutting the ground with a wire saw or inserting a steel plate will be described in detail with reference to FIGS.
FIG. 5 is a front view of the wall surface for explaining the water stoppage of the wall surfaces of the guide pipe, the starting shaft when the steel plate is installed, and the reaching shaft.
FIG. 5A shows a state in which the water stop packing 30 is installed around the guide pipe 10 when the guide pipe 10 is completely propelled into the borehole. Prevent outflow of water from the surroundings.
FIG. 5 (b) shows a state in which a water-stopping packing 32 is installed that cuts with a wire saw and closes the cut 31 immediately before inserting the steel plate, and prevents water from flowing out of the cut 31.
FIG.5 (c) has shown the state at the time of steel plate insertion after cutting with a wire saw, and water flows out from the periphery of a guide pipe, a steel plate insertion cutting part to a start shaft and a reach shaft by the water stop packings 30 and 32. It is preventing.

FIG. 6 is a plan view for explaining cutting with a wire saw and insertion of a steel plate, FIG. 7 is a view for explaining water stoppage between the guide tube and the steel plate, and FIGS. 8 to 9 are views for explaining a water stop ring.
FIG. 6 shows a state in which the preceding steel plate 40 has been inserted by cutting and the subsequent steel plate 41 has been inserted by cutting. On each steel plate, a guide pipe water stop rubber 45 is attached in the longitudinal direction to stop water between the guide pipe 10 to be cut and inserted. For example, as shown in FIG. 7A, the guide pipe water-stopping rubber 45 is a water-stopping rubber 50 that presses the side surface of the guide tube from the upper and lower surfaces of the steel plate outside the guide tube, or as shown in FIG. 7B. In addition, a water-stopping member such as a U-shaped water-stopping rubber 51 that wraps the side surface of the guide tube from the upper and lower surfaces of the steel plate is used. By sticking the guide pipe water stop rubber 45 to the steel plate in advance, the steel plate insertion portion of the guide pipe can be water stopped.

  The guide tube is also cut by cutting with the wire saw 11, and water in the ground flows into the guide tube from the cutting port. In this state, the inflowing water flows out from the end of the guide pipe to the start shaft and the reaching shaft side. In order to prevent this, the water stop rings 51 to 54 are provided in the guide pipe to be cut so that the water flowing into the guide pipe is contained between the water stop rings. That is, by providing the steel plate-side water-stop ring 5153 and the cutting-side water-stop rings 52 and 54 so as to sandwich the place where the ground is cut with a wire saw, between the steel plate-side water-stop ring and the cutting-side water-stop ring (see FIG. The inside of the guide tube is submerged only in (A section of 6). By pulling the cutting portion with the traction steel wire 17 in this state, the submerged section A moves to the reaching shaft side, and when the steel plate is inserted, the water in the section A flows out to the reaching shaft.

  As shown in FIGS. 8A and 8B, the steel plate-side water-stop ring 51 has a rubber packing 51a for water-stopping the inner peripheral surface of the guide tube, and a rubber for water-stopping surrounding the tip of the subsequent steel plate 41. It consists of packing 51b and moves while sliding on the inner surface of the guide tube by towing. In addition, 60 is a pipe | tube which lets the steel wire for a traction pass.

  As shown in FIG. 8C, the cutting side water stop ring 52 is a rubber packing that stops the inner peripheral surface of the guide tube, and similarly moves while sliding on the inner surface of the guide tube by traction. Reference numeral 60 denotes a pipe through which the tow wire passes, 61 denotes a wire brush water that stops the notch for inserting the wire saw, and 62 denotes an O-ring water stop of the towing steel wire part.

  As shown in FIG. 9A, the steel plate-side water stop ring 53 includes a rubber packing 53 a that stops the inner peripheral surface of the guide tube, and a rubber packing 53 b that surrounds the tip of the subsequent steel plate 41 and stops the water. By sliding, it moves while sliding on the inner surface of the guide tube. Reference numeral 60 denotes a pipe through which the pulling wire passes, and 65 denotes a wire brush that stops the joint portion of the preceding steel plate 40.

  As shown in FIG. 9B, the cutting side water stop ring 54 is a rubber packing that stops the inner peripheral surface of the guide tube, and similarly moves while sliding on the inner surface of the guide tube by traction. Reference numeral 60 denotes a pipe through which the traction wire passes, 62 denotes an O-ring water stop of the traction steel wire portion, and 65 denotes a wire brush that stops the joint portion of the preceding steel plate 40.

  In section B where the trailing steel plate tip between the water stop rings in FIG. 6 exists, the steel plate tip is inserted in the cutting part between the guides, and during this time, muddy water and high water are passed through the hoses 55 and 56. Since the pressure can be maintained by injecting the viscous material, the inflow of water from the ground between the water stop rings is limited to the C section so that the submerged section is minimized.

  Next, when constructing a structure under a vehicle traveling path or the like, when the ground is shaken by an earthquake, it is necessary to prevent the ground from being liquefied.

  The liquefaction will be described with reference to FIG. 10. For example, as shown in FIG. 10 (a), soil particles in the ground have a heavier specific gravity than groundwater. It is partly contacted through the like, and a gap is formed between them, and it is stable in a state where the pore water (groundwater to be supplied) is filled. When the ground in such a state is shaken by an earthquake, as shown in FIG. 10 (b), the gap between the soil particles becomes narrow and a dense state occurs, the pore water pressure rises, and the soil particles become pore water pressure. It will be in a floating state. This state is a liquefied state.

  When such liquefaction occurs, the underground structure cannot be constructed in a stable state. Therefore, as shown in FIG. 11, the above-described method for constructing the impermeable wall according to the present invention constructs an impermeable wall around the planned structure in the ground, and groundwater into the ground surrounded by the impermeable wall. Shut off the supply. In the state where the supply of groundwater is cut off, the movement of soil particles is suppressed even if the ground is shaken by an earthquake, so that the state of FIG. 10 (a) is maintained and the pore water pressure between the soil particles increases. As a result, liquefaction can be suppressed. In addition, if the impermeable wall is constructed and the groundwater supply is interrupted, the ground in the impermeable wall will be dried over time, so that the occurrence of liquefaction is further suppressed.

  According to the present invention, when cutting with a plastic cutting tool such as a wire saw, water can be stopped when a steel plate or sheet material is inserted, and the occurrence of liquefaction can be suppressed. large.

It is a figure explaining the construction procedure in the construction method of a impermeable wall. It is a figure explaining the connection of steel plates. It is a figure explaining the water stop of the steel plate which has a fitting joint. It is a figure explaining the water stop in the case of using the steel plate which does not provide a joint. It is a wall surface front view explaining the water stop of the wall surface of the start vertical shaft at the time of installation of a guide pipe and a steel plate, and an arrival vertical shaft. It is a top view explaining cutting with a wire saw and steel plate insertion. It is a figure explaining the water stop between a guide pipe and a steel plate. It is a figure explaining a water stop ring. It is a figure explaining a water stop ring. It is a figure explaining liquefaction of the ground. It is a figure explaining the ground liquefaction suppression method. It is a figure explaining the structure construction construction method by chemical | medical solution injection | pouring.

Explanation of symbols

5 ... Start shaft, 6 ... Reach shaft, 7 ... Ground, 10 ... Guide tube, 11 ... Wire saw, 15 ... Steel plate, 20 ... Joint, 25 ... Water stop rubber, 30, 32 ... Water stop packing, 40 ... Preceding Steel plates, 41 ... trailing steel plates, 45 ... guide pipe water stop rubber, 51-54 ... water stop rings.

Claims (7)

A guide tube for inserting a plastic cutting tool such as a wire saw is installed along the outer periphery of the planned structure, and a plastic cutting tool such as a wire saw is inserted between two adjacent guide tubes, and the guide tube is interposed between them. The water-stopping steel sheet or sheet material with joints formed on the sides is inserted into the cutting part, and the water-stopping steel sheet or sheet material inserted in advance in the guide tube is connected to the joints. In the construction method of installing a water-stop steel plate or sheet material along the outer periphery of the planned structure,
A construction method of a water-impervious wall, characterized in that a plastic material is filled in a connecting portion between joints in a guide pipe to stop water. A guide tube for inserting a plastic cutting tool such as a wire saw is installed along the outer periphery of the planned structure, and a plastic cutting tool such as a wire saw is inserted between two adjacent guide tubes, and the guide tube is interposed between them. After cutting the ground, insert a water-stopping steel plate or sheet material with water-stopping material on the upper and lower sides of the side into the cutting part, and attach the water-stopping material to the top and bottom surfaces inserted in advance in the guide tube In the construction method of installing a water-stop steel plate or sheet material along the outer periphery of the planned structure facing the water-stop steel plate or sheet material end,
A method for constructing a water-impervious wall, wherein a water-blocking material is filled in a guide tube to stop water. A guide tube for inserting a plastic cutting tool such as a wire saw is installed along the outer periphery of the planned structure, and a plastic cutting tool such as a wire saw is inserted between two adjacent guide tubes, and the guide tube is interposed between them. The water-stopping steel sheet or sheet material with joints formed on the sides is inserted into the cutting part, and the water-stopping steel sheet or sheet material inserted in advance in the guide tube is connected to the joints. In the construction method of installing a water-stop steel plate or sheet material along the outer periphery of the planned structure,
A construction method of a water-impervious wall, characterized in that, when the guide pipe propulsion is completed, water-stopping packing is installed around both ends of each guide pipe. Furthermore, a plastic cutting tool such as a wire saw is inserted across two adjacent guide tubes, the guide tube and the ground between them are cut, and water is stopped at the cut end where a water-stopping steel sheet or sheet material is inserted. 4. A method for constructing a water-impervious wall according to claim 3, wherein a packing is installed. A guide tube for inserting a plastic cutting tool such as a wire saw is installed along the outer periphery of the planned structure, and a plastic cutting tool such as a wire saw is inserted between two adjacent guide tubes, and the guide tube is interposed between them. The water-stopping steel sheet or sheet material with joints formed on the sides is inserted into the cutting part, and the water-stopping steel sheet or sheet material inserted in advance in the guide tube is connected to the joints. In the construction method of installing a steel plate or sheet material along the outer periphery of the planned structure,
Each steel plate is provided with a water stop member for stopping water between the guide tube 10 to be inserted by cutting. A guide tube for inserting a plastic cutting tool such as a wire saw is installed along the outer periphery of the planned structure, and a plastic cutting tool such as a wire saw is inserted between two adjacent guide tubes, and the guide tube is interposed between them. The water-stopping steel sheet or sheet material with joints formed on the sides is inserted into the cutting part, and the water-stopping steel sheet or sheet material inserted in advance in the guide tube is connected to the joints. In the construction method of installing a water-stop steel plate or sheet material along the outer periphery of the planned structure,
It is characterized by providing a water-stop ring that can move in the guide tube with cutting between the cutting part that cuts the guide tube and natural ground and that stops the water in the guide tube, and limits the submerged section in the guide tube between the water-stop rings How to build a impermeable wall. A water-impervious wall is built around the planned structure in the ground. During and after the construction of the planned structure, the groundwater supply to the interior is blocked by the impermeable wall and the movement of the ground inside the impermeable wall is suppressed. And the liquefaction suppression method characterized by suppressing liquefaction of the ground.

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