JP4999399B2 - Underground structure insertion method using double plate - Google Patents

Description

  The present invention relates to a construction method for constructing a structure under a vehicle travel path, and particularly to a construction method for constructing a structure under a vehicle travel path without excavating a natural ground.

  Various methods are used as a method of constructing underground structures without carving under the vehicle running path. Especially when the earth covering is small, box-shaped steel pipe elements are inserted sequentially by connecting joints in the crossing direction. A method of using them as a main body structure is known (Patent Document 1).

In addition, as a method of constructing an intersection structure under the vehicle traveling path, the ground is cut with a wire saw or a chain saw, and a protective steel plate is applied to the cutting part as a method that hardly changes the track and road surface. A construction method for inserting a soil retaining member is also known (Patent Document 2).
JP-A-11-247579 JP 2004-204624 A

  The construction method of Patent Document 1 may cause deformation of the track or road surface when the element is inserted. Although the construction method of Patent Document 2 is excellent in protecting the natural ground, it was necessary to excavate the internal soil in parallel when constructing the structure. In the conventional construction method, the soil is excavated while protecting the ground with a highly rigid protective work, and a structure is built in the ground, so there is a limit to shortening the construction period, and further improvements can be made to further reduce costs. It was desired.

The present invention is intended to solve the above-mentioned problems, and further develops a method of cutting a natural ground with a wire saw or a chain saw and inserting a steel plate into the cutting portion to form a retaining member, such as under a vehicle traveling road. The objective is to eliminate underground excavation and to build underground structures safely and economically.
For this purpose, the underground structure insertion method according to the present invention includes a step of installing a guide tube for inserting a flexible cutting tool such as a wire saw by performing horizontal boring along the outer periphery of the planned structure, and two adjacent guide tubes. A flexible cutting tool such as a wire saw is inserted across the guide tube and the ground between them is cut, and a two-layer plate with reduced frictional resistance between the two is inserted into the cutting part. Install along the outer periphery of the planned structure, install the structure on the rear part of the plate, slide the ground surrounded by the plate and the structure together with the inner plate and move to the outer plate, from the front exit part The method includes discharging the inner plate and the ground.
Further, the present invention is characterized in that a steel wire or a steel rod is inserted into the borehole or guide tube in advance and connected to the structure, and pulled from the front to slide the structure with the inner plate with respect to the outer plate. To do.
In addition, the present invention is characterized in that the structure is pushed from behind and is slid with respect to the outer plate together with the inner plate.
In addition, the present invention is characterized in that a cylindrical structure that matches the outer circumference of the structure is installed at the front outlet, and the extruded ground is removed after passing through the structure.
In addition, according to the present invention, each time the structure moves a predetermined distance, another structure is sequentially added to the rear portion and inserted.

  In the present invention, after inserting a double-layered plate with reduced frictional resistance between two sheets into the ground along the outer periphery of the planned structure, the structure is slid with respect to the outer plate together with the inner plate. By replacing it with soil, it becomes possible to eliminate the excavation of natural ground under the vehicle traveling path and insert and construct the underground structure safely and economically.

Embodiments of the present invention will be described below.
1-5 is a figure explaining the construction procedure of this invention construction method, Fig.1 (a)-FIG.5 (a) are side sectional drawings, FIG.1 (b)-FIG.5 (b) are cross-sectional views. is there.
The present invention intends to insert and construct a structure in a direction intersecting the track in the ground 1 under the vehicle traveling path such as a track, and the construction procedure will be described.
First, in order to construct a guide pipe made of a synthetic resin such as vinyl chloride for inserting a wire saw, the ground 1 between the start shaft 2 and the end shaft 3 is drilled horizontally along the outer periphery of the planned structure. . In the illustrated example, boring holes are formed in a total of eight locations, ie, 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. 1B).

  Next, a guide tube 4 is installed in each boring hole, and a wire saw 5 is inserted across two adjacent guide tubes (in the example shown, a guide tube at the corner of the planned structure and a guide tube at an intermediate position). To do. As shown in FIG. 2, the wire saw 5 includes a plurality of adjustment driven pulleys 7 and 8 for adjusting direction change and feeding length, and a driving pulley (not shown) in the driving device 6 provided on the reaching shaft side. It is wound around endlessly. The endless wire saw 5 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 8 at the tip of the wire saw 5 is attached to, for example, a protrusion (not shown) provided at the tip of the two-layered plate 10 and is inserted in advance through a boring hole or a guide tube (see FIG. The plate 10 is pulled by a pulling jack (not shown) installed on the reaching shaft side using a wire saw, and the guide pipe and the ground between them are cut by a wire saw. The plate 10 is made of a steel plate or the like and is stacked in two, and is inserted into a cutting portion by a wire saw. The two-layered plate 10 is formed by reducing the frictional resistance between the two sheets by reducing the resistance by, for example, applying a lubricant between them, providing a small protrusion, or making it wavy. FIG. 2B shows a state in which the plates 10 are inserted into the upper and lower surfaces and a part of the side surface. In the illustrated example, eight plates are finally inserted along the outer periphery of the planned structure. The Therefore, the plate 10 having a width corresponding to the distance between the guide tube and the guide tube is used. In the above description, the driving device 6 is installed on the arrival shaft side. However, the driving device 6 may be installed on the starting shaft side. In this case, the driven pulley 8 at the distal end portion of the wire saw is disposed at the distal end portion of the two stacked plates 10. The wire saw is wound so as to surround the plate 10 and is sequentially fed out along with the cutting.

  Next, as shown in FIG. 3, the structure 20 is installed at the rear end of the plate 10, and a steel wire (or steel rod) 12 inserted in advance through a boring hole or a guide tube is connected to the front end of the structure 20. To do. A cylindrical high-rigidity structure 15 that matches the outer dimension of the structure is installed on the reach shaft side, and the structure 20 is pulled by installing the tow jack 13 using the structure 15 as a reaction wall member. The structure 15 has a certain length in the pulling direction, and after passing through this, the soil of the natural ground is removed so that the removal of the soil at the exit portion does not affect the natural ground under the track. ing.

  As shown in FIG. 4, the inner plate slides with respect to the outer plate by pulling the structure 20, and the plate 10 is surrounded by the plate. The mountain and the structure move with the inner plate in the pulling direction. At this time, there is circumferential friction between the outer plate and the surrounding natural ground, but if the outer plate moves, the natural ground may be deformed. It is desirable to fix it, and it is also desirable to connect between the inner plate and the structure. Then, every time the structure is pulled a predetermined distance, another structure is connected to the rear end of the structure and sequentially pulled. At the exit portion on the reaching shaft side, the soil 21 of the natural ground is removed after passing through the structure 15. Further, the inner plate to be extruded is sequentially wound or cut to be removed. Therefore, it is desirable to make the inner plate as thin as possible, and it is desirable to make the outer plate thicker so as not to affect the outer ground.

  By sequentially connecting and inserting the structures in this way, the natural ground in the plate is pushed out without being excavated and replaced with the structure, and the under-track structure 30 is constructed as shown in FIG. In the above example, the structure is pulled by the steel wire or the steel rod. However, the structure may be pushed and pushed from the rear, or the pulling and the pushing from the rear may be used in combination.

  According to the present invention, it is possible to eliminate the excavation of the ground under the vehicle traveling path and insert and construct the underground structure safely and economically, so that the industrial utility value is extremely large.

It is a figure explaining the construction procedure of this invention construction method. It is a figure explaining the construction procedure of this invention construction method. It is a figure explaining the construction procedure of this invention construction method. It is a figure explaining the construction procedure of this invention construction method. It is a figure explaining the construction procedure of this invention construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground mountain, 2 ... Starting shaft, 3 ... Arrival shaft, 4 ... Guide pipe, 5 ... Wire saw, 6 ... Drive apparatus, 7, 8 ... Drive pulley, 10 ... Plate, 12 ... Steel wire, 13 ... Traction jack 15 ... Structure, 20 ... Structure, 21 ... Soil, 30 ... Structure under the track.

Claims (5)

Installing a guide tube along the outer periphery of the planned structure to insert a flexible cutting tool such as a wire saw by performing horizontal boring;
Insert a flexible cutting tool such as a wire saw across two adjacent guide tubes to cut the guide tube and ground between them, and create a two-ply plate with reduced frictional resistance between the two Inserting into the cutting part and installing along the outer periphery of the planned structure,
Installing the structure at the rear of the plate, sliding the ground surrounded by the plate and the structure together with the inner plate against the outer plate, and discharging the inner plate and the ground from the front outlet;
Underground structure insertion method using double plate containing The steel wire or steel rod is inserted into the borehole or guide tube in advance and connected to the structure, and pulled from the front to slide the structure against the outer plate together with the inner plate. Underground structure insertion method. 2. The underground structure insertion method according to claim 1, wherein the structure is pushed from the rear and propelled to slide with respect to the outer plate together with the inner plate. 2. The underground structure insertion according to claim 1, wherein a cylindrical structure matching the outer circumference of the structure is installed at the front exit, and the extruded ground is removed after passing through the structure. Construction method.
2. The underground structure insertion method according to claim 1, wherein each time the structure moves a predetermined distance, another structure is sequentially added to the rear portion and inserted.

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