JP2003166399A - Flexible segment and mounting method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular flexible segment which is for use in a shield tunneling method for constructing water supply and sewerage systems, tunnels, industrial water works, etc., and contributes to reduction of frictional damage between annular frame bodies and a propulsion bearing member thereof. <P>SOLUTION: The annular flexible segment 1 is comprised of a pair of the annular frame bodies 2, 3 opposedly arranged in a manner being spaced a predetermined interval away from each other, an annular primary cutoff member 4 arranged between the annular frame bodies 2, 3 on an outer surface side of the flexible segment, and a thrust bearing member 6 arranged between the annular frame bodies 2, 3 and attached to main girder surfaces 2a, 3a formed on respective inner sides of the annular frame bodies 2, 3. The flexible segment 1 is characterized in that an abrasion resistant plate 9 is arranged in an area where the main girder surface 3a of the annular frame body makes contact with the thrust bearing member, and that the abrasion resistant plate 9 is formed of a high-density polymer or a metallic plate having lubricant-treated surfaces. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Tunnel, agricultural water supply, industrial water supply shield method,
The present invention relates to an annular flexible segment used in a propulsion method and the like, and a construction method for the segment.

[0002]

2. Description of the Related Art Conventionally, a shield construction method using a shield machine has been adopted in excavating a pipeline such as a tunnel. This shield construction method uses tubular steel cells that match the cross-sectional shape of tunnels and the like to excavate the inside front of the cell while preventing soil from collapsing, and at the same time push the cell forward with a hydraulic jack etc. to advance the excavator. I am trying to do it. Immediately after the excavation, the lining is temporarily performed with an annular segment. Then, in order to prevent the pipeline from being damaged by absorbing the expansion and contraction between the pipelines and the displacement caused by the uneven settlement of the ground, a flexible segment is arranged at a predetermined position of the annular segment.

FIG. 3 shows a perspective view of a general structure of a flexible segment used in such a shield construction method. In the figure, an annular flexible segment A is composed of a pair of annular frames B and an annular water blocking material C arranged between them.

The annular flexible segment A is annularly formed by connecting the circumferential ends of the divided pieces A ₁ , A ₂ , A ₃ , A _n divided into a plurality of pieces in the circumferential direction with bolts. Assembled. Then, each of the divided pieces A ₁ , A ₂ , A ₃ , A _n of the flexible segment A is arranged in a pair between annular frame bodies B ₁ , B ₂ , B ₃ , B _n arranged on both sides in the axial direction and in the middle thereof. The water blocking material C ₁ , C ₂ , C ₃ , and C _n are formed.

Next, FIG. 4 shows a sectional view taken along the line KK of the annular flexible segment A in FIG. In the figure, since the flexible segment A receives a reaction force in the excavation direction during excavation, a thrust receiving member 12 that supports it is fitted. The thrust receiving material 1
Reference numeral 2 is the inner side in the radial direction of the annular water blocking member C, and is arranged between the pair of annular frame bodies B. Then, the thrust receiving member 12 is attached to the main girder surfaces 13 and 14 formed inside the annular frame B.

Here, the thrust receiving member 12 is fitted and attached between the guide frame 12a attached to the main girder surface 14 of one annular frame, and the main girder surface 13 of the other annular frame and the guide frame. It is composed of a wedge material 12b.

Since the reaction force is released after the end of excavation, a two-step construction method is adopted in which the thrust receiving member is removed from the main girder surface and the flexible rubber joint 15 is attached, as shown in FIG. . Since the flexible segment is loaded by the earth pressure even during excavation, it is necessary to provide the flexible segment with a water stop function for several months to one year, for example. Conventionally, as shown in FIG. 5, an annular structure 16 made of a rubber material such as urethane is arranged on the outer peripheral side of the flexible segment and between the annular frames B to give it a water blocking function. This annular structure is called a primary water blocking material.
After the excavation of a tunnel or the like, the thrust receiving member 12
Is removed from the flexible segment, and a flexible rubber joint 15 is attached as shown in FIG. 5, and this further serves a water stop function, so this flexible rubber joint 15 is referred to as a secondary water stop material.

In the conventional flexible segment, the thrust receiving member 12 is, as described above, inside the annular water blocking member C in the radial direction,
It is arranged between the pair of annular frame bodies B. Then, the thrust receiving member 12 is attached to the main girder surfaces 13 and 14 formed inside the annular frame B. And here the thrust receiving material 12 is
Guide frame 1 attached to main girder surface 14 of one annular frame
2a, a wedge member 12b which is fitted and mounted between the main girder surface 13 of another annular frame and the guide frame is generally used. The wedge member 12b is provided on the guide frame 12a.
Attached and removed with the attached. When the wedge member 12b is detached, a strong frictional force and an impact force are applied to the wedge member by a hammer or the like, so that the coating of the main girder surface 13 contacting the wedge member is peeled off and the main girder surface is damaged. .

[0009]

SUMMARY OF THE INVENTION According to the present invention, in an annular flexible segment in which a thrust receiving member is attached to a main girder surface formed radially inward of the annular frame, friction when attaching the thrust receiving member is provided. Due to the force and impact force, the coating of the main girder surface in contact with the propulsion receiving material is not peeled off, and further damage to the main girder surface is reduced. In particular, a two-division type in which a thrust receiving member is composed of a guide frame attached to the main girder surface of one annular frame and a wedge member fitted and attached between the main girder surface of the other annular frame and the guide frame. In the propulsion receiving material, even when a heavy frictional force and an impact force are applied to the wedge material when the wedge material is attached and detached, the main girder surface in contact with the wedge material does not peel off, and the main girder does not peel off. It is intended to provide a technique for reducing surface damage.

[0010]

SUMMARY OF THE INVENTION According to the present invention, between a pair of annular water-blocking members arranged radially outward between a pair of annular frame members facing each other with a constant distance between the pair of annular frame members. In an annular flexible segment provided with a thrust receiving member attached to the main girder surface formed inside the annular frame, a friction resistant plate is provided between the main girder surface of the annular frame and the thrust receiving member. Is a flexible segment.

The friction resistant plate is preferably a high density resin or a metal plate whose surface is treated with a lubricant.

Further, in the flexible segment of the present invention, the thrust receiving member is provided between a guide frame attached to a main girder surface of one annular frame body and a main girder surface of the other annular frame body and the guide frame. It is preferably composed of a wedge member fitted and attached, and the friction resistant plate is preferably arranged between the wedge member and the main girder surface. The flexible segment may be circumferentially divided into a plurality of divided pieces.

Further, according to the present invention, when the thrust receiving member is attached to the main girder of the annular frame, (1) a friction resistant plate is provided in order to reduce the friction of the contact surface between the thrust receiving member of the flexible segment and the main girder surface. Between the thrust receiving member and the main girder surface, and (2) removing the friction resistant plate from the main girder for the thrust receiving member after the flexible segment has stopped receiving thrust. It is a construction method of a flexible segment.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a flexible segment during excavation according to the present invention. In the flexible segment 1 of the present invention, an annular primary water blocking member 4 is mounted between a pair of annular frame members 2 and 3, and a thrust receiving member 6 is attached along the inner side of the primary water blocking member 4. There is. Here, as shown in FIG. 3, the flexible segment 1 is assembled in an annular shape by connecting the ends of a plurality of divided pieces, which are divided into a plurality of pieces in the circumferential direction, to each other by bolts as in the conventional structure. The annular frame bodies 2 and 3 are provided with main girder surfaces 2a and 3a and outer plates 2b and 3b which face each other with a predetermined separation, and the outer peripheries of these main girder surfaces and outer plates are cylindrical outer peripheral plates 2c, It is welded to 3c. Main girder surface 2
a and 3a are welded or the like at the axially inner positions of the outer peripheral plates 2c and 3c, and the outer plates 2b and 3b are welded or the like to the axially outer end positions of the outer peripheral plates. Spacers (not shown) are interposed at regular intervals in the circumferential direction between the main girder surfaces 2a, 3a and the outer plates 2b, 3b in order to keep the intervals on both sides constant.

Next, inside the outer peripheral plates 2c, 3c in the radial direction, cylindrical inner peripheral plates 2d, 3d are parallel to the outer peripheral plates 2c, 3c.
Are provided, and one ends of the inner peripheral plates 2d and 3d are welded and fixed to the main girder surfaces 2a and 3a. An annular primary water stop material 4 is sealed in an annular space formed between the annular frames 2 and 3 adjacent to the inner ends of the inner peripheral plates 2d and 3d.

The main girder surfaces 2a, 3a and the inner peripheral plate 2
A thrust receiving member 6 is attached in contact with d and 3d. The thrust receiving member 6 is a guide frame 6a to which main girder surfaces 2a and 3a are attached by bolts and nuts 8, respectively, and a wedge member fitted into a wedge-shaped space formed by the guide frame 6a and one of the main girder surfaces 3a. 6
b. The wedge member 6b and the guide frame 6a are fixed integrally by bolts and nuts 10a, respectively, while the wedge member 6b and the main girder surface 3a are fixed integrally by bolts and nuts 10b, respectively. The thrust receiving member 6 is composed of the main girder surfaces 2a, 3a or the inner peripheral plate 2d,
A plurality of 3d are attached at predetermined intervals in the circumferential direction. Then, when the excavation is completed, the thrust receiving member 6 is removed in the reverse order of the mounting order.

According to the present invention, in the above flexible segment,
A friction resistant plate 9 is arranged in a region in contact with the main girder surface 3a of the thrust receiving member 6, particularly the wedge member 6b. As shown in the perspective view of FIG. 2, the anti-friction plate 9 is, for example, in the shape of a thin plate, and insertion holes 9a and 9b through which mounting bolts are inserted are formed inside thereof.

The shape of the friction resistant plate 9 is not particularly limited, but it is formed in a thin plate shape in the contact region between the main girder surface 3a and the wedge member 6b.
And the thickness thereof is preferably in the range of about 1 mm to about 3 mm.

The friction resistant plate 9 is a metal plate such as steel,
High density resin can be used. As the high-density resin, thermoplastic resins such as high-density polyethylene, polypropylene, polyester, nylon or polyimide, as well as thermosetting resins such as polyurethane resin and phenol resin can be used.

By disposing the anti-friction plate 9 in a region in contact with the main girder surface 3a of the wedge member 6b, when the wedge member 6b is detached, sliding on the contact face is smoothed and abrasion of the contact face is reduced. be able to. When a metal plate is used for the friction resistant plate, it is preferable to treat the surface with a lubricant in order to reduce the friction coefficient of the contact surface. Here, as the lubricant, for example, solid lubricants such as Sekiboku, peach, talc, soap stone, zinc white, molybdenum sulfide, petroleum-based lubricating oil,
Lubricating oils such as synthetic lubricating oil and fatty oil, and grease can be used.

In the present invention, the friction resistant plate 9 is interposed between the main girder surfaces 3a of the wedge member 6b, but between the other main girder surface 2a and the guide frame 6a or between the guide frame 6a and the wedge member 6b. It is also possible to intervene.

The cross-sectional view of the flexible segment of the present invention with the thrust receiving member 6 removed is the same as the conventional structure shown in FIG. The annular space in the portion where the thrust receiving member is removed is sealed by a secondary water stopping material 15 made of an elastic material such as rubber in response to water leakage from the primary water stopping material 16 when the ground is unevenly submerged. . The secondary water blocking member 15 has a corrugated sectional shape, for example, a curved sectional shape as shown in the figure. And both ends thereof are the inner peripheral plate 2 of each annular frame.
It is attached to d and 3d with bolts and nuts 17a and 17b.

In FIG. 1, the primary water blocking member 4 is made of an elastic body which is formed of a plurality of flexible segments and can expand and contract in the longitudinal direction of the tubular body, such as polyurethane, silicone rubber, diene rubber, and other rubber components. Among rubber-like elastic bodies, resins, foam materials and the like, urethane rubber is particularly excellent in elasticity, durability and strength characteristics.

In the cross-sectional shape of the primary water blocking member 4, the radially outer cross-sectional width of the annular body is larger than the cross-sectional width located inside the annular body, and is so-called wedge-shaped in cross section.
By adopting a wedge shape in cross section, it is possible to restrain the movement of the primary water blocking material outward in the radial direction when earth pressure is applied. In addition to forming the side walls of the primary waterproof material at the same angle,
As shown in FIG. 1, only a part of the side wall may be formed at different angles.

Incidentally, in order to fill the divided pieces of the annular body with the primary water-stopping material, stiffening ribs (not shown) are arranged at the upper end portions of the inner peripheral plates 2d, 3d, and the primary body is introduced from the inner side of the annular body. Pour the rubber material of the waterproof material. In this case, the divided pieces can be arranged upside down in FIG. That is, the outer peripheral plates 2c and 3c
Is placed on the lower side, and an insulating material such as paper, household wrapping material, vinyl or the like is placed on the bottom of the injection groove so that the rubber material does not flow out.

Further, a rubber material molded and vulcanized from natural rubber, synthetic rubber or the like into a predetermined shape may be inserted and arranged between the annular frames 2 and 3. A sealing material such as a sealing material, caulking material, or water-expandable rubber is applied to the seam of the cross section of the water blocking material so that no gap is formed at the seam of the primary water blocking material in the circumferential direction.

In the present invention, it is preferable to dispose a cover plate 7 made of an annular thin metal plate on the outside of the outer peripheral plates 2c, 3c in order to protect the primary water-stopping material. It is made of spot-welded thin iron plate so that the flexible segment can be easily disengaged depending on the displacement at the time and the flexible segment can be moved.

Next, the method for constructing the flexible segment of the present invention is such that when the thrust receiving member is attached to the main girder of the annular frame,
(1) A step of disposing a friction resistant plate between the thrust receiving member and the main girder surface in order to reduce the friction of the contact surface between the thrust receiving member of the flexible segment and the main girder surface; The method for constructing the flexible segment includes a step of removing the friction resistant plate from the main girder of the thrust receiving member after the segment is no longer subjected to the thrust.

In addition to the conventional flexible segment construction method, the construction method according to the present invention is performed by disposing a friction resistant plate such as a steel thin plate or a resin thin plate between the contact surface between the thrust receiving member and the main girder surface. Further, abrasion damage between the thrust receiving member, particularly the wedge member and the main girder surface can be reduced, and the desorption of the thrust receiving member can be facilitated to improve the workability.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[0032]

As described above, in the flexible segment of the present invention, since a friction resistant plate such as a steel thin plate or a polymer thin plate is interposed between the contact surface between the thrust receiving member and the main girder surface, the thrust receiving member, In particular, the friction between the wedge member and the main girder surface was reduced, and the attachment / detachment could be performed smoothly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a state in which a thrust receiving member is arranged in a flexible segment of the present invention.

FIG. 2 is a perspective view of a friction resistant plate used in the flexible segment of the present invention.

FIG. 3 is a schematic perspective view of a flexible segment.

4 is a sectional view taken along line KK of FIG.

FIG. 5 is a cross-sectional view showing a state where a secondary water blocking material is arranged in the flexible segment.

[Explanation of symbols]

1 flexible segment, 2, 3 annular frame, 2a, 3a
Main girder surface, 2b, 3b outer plate, 2c, 3c outer peripheral plate, 4
Primary water blocking material, secondary water blocking material, 6 thrust receiving material, 6a guide plate, 6b wedge material, 7 cover plate, 9 friction resistant plate.

Claims (5)

[Claims] 1. A ring-shaped water stop member disposed radially outside between a pair of ring-shaped frame members facing each other at a constant interval,
Between the pair of annular frame bodies, in a ring-shaped flexible segment having a thrust receiving member attached to a main girder surface formed inside the annular frame body, a main girder surface of the annular frame body and thrust A flexible segment characterized in that a friction resistant plate is arranged between the receiving members. 2. The flexible segment according to claim 1, wherein the friction resistant plate is a high-density resin or a metal plate whose surface is treated with a lubricant. 3. The thrust receiving member comprises a guide frame attached to the main girder surface of one annular frame body, and a wedge member fitted and attached between the main girder surface of the other annular frame body and the guide frame. The flexible segment according to claim 1, wherein the anti-friction plate is disposed between the wedge member and the main girder surface. 4. The flexible segment according to claim 1, wherein the flexible segment can be circumferentially divided into a plurality of divided pieces. 5. When attaching a thrust receiving member to the main girder of the annular frame, (1) In order to reduce the friction of the contact surface between the thrust receiving member of the flexible segment and the main girder surface, a friction resisting plate is used. A step of arranging between the material and the main girder surface, and (2) after the flexible segment is no longer subjected to thrust,
A method for constructing the flexible segment, comprising a step of removing the friction resistant plate from the main girder of the thrust receiving member.