JP2004225344A - Underground structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the construction of an underground structure by eliminating obstacle removal work while allowing the construction of the structure with thin wall thickness when the scale of the structure is small. <P>SOLUTION: An underground part corresponding to the outer periphery of the underground structure to be constructed is cut with a cutting tool 4 such as a wire saw or chain saw, and earth retaining members and structural members are inserted in the cut part. The inside surrounded by the members is excavated to construct the underground structure. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure constructed under the track or the like and underground, and a method of constructing the structure.
[0002]
[Prior art]
In the case of constructing an underground structure by a non-digging method under a railway or road, for example, a concrete or steel element having a rectangular cross section is inserted into the ground by propulsion or traction while excavating the inside, 2. Description of the Related Art A plurality of elements are connected to each other with joints and used as a main body of an underground structure.
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. Hei 6-280469
[Patent Document 2] Japanese Patent Application Laid-Open No. 2000-120372
[Problems to be solved by the invention]
In the construction methods of Patent Documents 1 and 2, since the elements are elements that can be inserted by humans, the size of the elements is large, and the wall thickness is large compared to the scale of the structure. In addition, the construction site may include obstacles such as gravel and boulders in the ground. In such a case, no matter what construction method is used, if they are removed in advance during the construction, the construction can be performed safely and the construction speed can be increased. However, conventionally, the removal work of these cobblestones and the like requires a hole of a predetermined size in the ground, and the removal operation of removing the cobblestones by a person entering inside is extremely difficult. Reference 2 does not consider such measures.
[0006]
[Means for Solving the Problems]
The present invention is intended to solve the above-described problems, and it is possible to construct a structure with a small wall thickness when the structure scale is small, eliminate the work of removing obstacles, and easily construct an underground structure. Is what you try to do.
The present invention relates to a structure constructed underground, comprising a retaining member and a structural member inserted into an underground portion corresponding to an outer periphery of the structure cut by a flexible cutting tool such as a wire saw or a chain saw. It is characterized by.
Further, the structure of the present invention is characterized in that the structure of the structure is formed by the structural member or the structural member and the insert slab.
Further, the structure of the present invention is characterized in that the structural member is a concrete panel, a steel material, a wood, a resinous panel, or the like.
Further, the structure of the present invention is characterized in that the shape of the structure is rectangular in cross section, polygon in cross section, semicircular in cross section, or curved in cross section.
Further, the present invention provides a method of constructing an underground structure, wherein the underground portion corresponding to the outer periphery of the underground structure to be constructed is cut with a flexible cutting tool such as a wire saw or a chain saw, and the ground is fixed at the cut portion. A member and a structural member are inserted, and an underground structure is constructed by excavating an inside surrounded by the member.
Further, the underground structure construction method of the present invention is characterized in that the structure of the structure is formed by the structural member or the structural member and the insert floor slab.
The underground structure construction method of the present invention is characterized in that the structural member is a concrete panel, a steel material, a wood, a resinous panel, or the like.
The underground structure construction method according to the present invention is characterized in that the shape of the structure is a rectangular cross section, a polygonal cross section, a semicircular cross section, or a curved cross section.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram illustrating the underground structure construction method of the present embodiment, FIG. 2 is a cross-sectional view illustrating the underground structure construction method, and FIG. 3 shows a state where the construction site is surrounded by steel plates and supports. FIG.
[0008]
As shown in FIG. 1, when constructing an underground structure 2 directly below a track 1, the periphery thereof is cut with a wire saw (or a flexible cutting tool such as a chain saw) 4 as a cutting point 3 of the ground, and If an obstacle such as a boulder is included in the slab, the cutting is performed including the obstacle. For example, the wire saw 4 cuts the upper surface or the side surface or the entire circumference of a future underground structure as a ground cutting point. In the case of a structure with a curved section at each vertex, a thin hole is made at the intersection (vertex) of each straight line approximating the curve, and a wire saw is used to stretch it through a pulley (not shown), and it is rotated at high speed by motor drive The surface formed by the wire saw is cut into a flat shape by pulling the wire saw toward the front side. In the case of a chainsaw, cutting is performed while pushing forward.
[0009]
As shown in FIG. 2, while the wire saw 4 is being rotated, the wire saw 4 is pulled and propelled in the traveling direction indicated by an arrow, and at the same time, the member 5 is inserted from the opposite side into the portion cut by the wire saw 4. The members to be inserted include structural members such as earth retaining plates (for example, sheets and iron plates) for preventing soil from collapsing during excavation, concrete panels for constructing structures, steel materials, wood, and resin panels. The member is pulled in and inserted using the power of pulling the wire saw. The structure is constructed by excavating the portion surrounded by the inserted members. In this case, a precast concrete slab may be inserted into a portion corresponding to the bottom surface of the structure, and the shape of the structure may be formed by the structural member and the inserted slab.
[0010]
FIG. 3 is a cross-sectional view using a steel plate as a structural member to be inserted into a cut portion.
The inside of the underground structure is excavated in a state in which the upper surface and side surfaces or the entire periphery are surrounded by the steel plate 8. Of course, an earth retaining sheet may be provided outside the steel plate. When excavating, a support 6 is provided as necessary to prevent settlement. The steel plate to be used may be a flat plate or a straight steel sheet pile having a joint, and may be a T-type, a π-type, or a □ -type for increasing rigidity. In this way, after excavating the underground structure construction site 7, the underground structure is constructed by arranging the reinforcement or rolling in the steel material of the shoring and placing concrete.
[0011]
The connection between the structural members inserted around the construction of the underground structure may be such that, for example, as shown in FIG. 4, joints 10 are formed along the ends of the structural members and these joints are interconnected. Alternatively, as shown in FIG. 5, the ends of the structural members may be fixed to each other with bolts 11. Further, the connection between the structural members may be performed by welding, bonding, crimping, cast-in-place reinforced concrete joints or the like, without being limited to mechanical joints and bolting. In the case where the rectangular cross section is large, cutting with a wire saw may be performed by dividing the surface into a plurality of parts, the structural members may be divided into a plurality of parts, inserted, and connected to each other by joints.
[0012]
FIG. 6 is an explanatory diagram in the case of constructing a structure having a semicircular cross section.
Each surface obtained by approximating the semicircular cross section with a polygonal line is cut with a flexible cutting tool such as a wire saw or a chain saw, and a member 5 composed of a retaining member or a structural member is inserted into each surface, and a floor corresponding to the bottom surface is placed. The plate 12 is inserted to build the shape of the structure, a support is provided (not shown), and the inside is excavated to build an underground structure.
[0013]
【The invention's effect】
As described above, according to the present invention, the upper surface, the upper surface, or the entire periphery of the underground structure construction site is cut in advance with a flexible cutting tool such as a wire saw or a chain saw, and a soil retaining member or a structural member is cut at the cut site. Is inserted and a support is provided as necessary, so that a structure having a small wall thickness can be constructed when the structure scale is small. In addition, it is possible to eliminate the obstacle removing operation and easily construct the underground structure.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating an underground structure construction method of the present invention.
FIG. 2 is a cross-sectional view illustrating a method of constructing an underground structure.
FIG. 3 is a diagram showing a state in which a provisional construction name is surrounded by steel plates and supports.
FIG. 4 is a diagram illustrating an example in which structural members are joined by a mechanical joint.
FIG. 5 is a diagram illustrating an example of bolting between structural members.
FIG. 6 is an explanatory diagram in the case of constructing a structure having a semicircular cross section.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Track, 2 ... Underground structure, 3 ... Cutting point, 4 ... Wire saw, etc. 5 ... Insertion member, 6 ... Shoring, 7 ... Excavation point, 8 ... Steel plate, 10 ... Joint, 11 ... Bolt, 12 … Floor slab.

Claims (8)

In a structure constructed underground, it is constructed by a retaining member and a structural member inserted into an underground portion corresponding to an outer periphery of the structure cut by a flexible cutting tool such as a wire saw or a chain saw. Underground structure. The underground structure according to claim 1, wherein the shape of the structure is formed by the structural member or the structural member and the insertion floor slab. The underground structure according to claim 1, wherein the structural member is a concrete panel, a steel material, a wood, a resinous panel, or the like. The underground structure according to claim 1, wherein the shape of the structure is rectangular, polygonal, semicircular, or curved. In a method of constructing an underground structure, an underground portion corresponding to the outer periphery of the underground structure to be constructed is cut with a flexible cutting tool such as a wire saw or a chain saw, and a retaining member and a structural member are inserted into the cut portion. And constructing an underground structure by excavating the interior surrounded by the member. 6. The method of constructing an underground structure according to claim 5, wherein the shape of the structure is formed by the structural member or the structural member and the insert slab. The underground structure according to claim 5, wherein the structural member is a concrete panel, a steel material, wood, a resinous panel, or the like. The underground structure according to claim 5, wherein the shape of the structure is rectangular, polygonal, semicircular, or curved.

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