JP2001262982A - Lining method for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a tunnel by use of a shield machine propelled by obtaining a reaction from a lining body consisting of a segment without cracking the segment. SOLUTION: A protective plate 12 consisting of a metallic plate of stainless steel or the like or a high strength fiber board of carbon fiber, glass fiber, steel fiber or the like is preliminarily installed to a bonding end surface 11B on the excavation side of the segment 11. When the shield machine is propelled by pressing the bonding end surface 11b of the segment 11 by a jack, the transfer of a tensile force generated between jacks is surely prevented by the protective plate 12 to prevent the cracking in the bonding end surface 11B of the segment by the tensile force generated between the jacks, and a lining body never causing a leakage by the crack is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining method by a shield method in which a plurality of segments are joined to each other to form a lining body.

[0002]

2. Description of the Related Art Conventionally, a shield method has been known as a tunnel lining method. This shield method is a method of digging the ground with a shield machine and assembling a plurality of arc-shaped segments behind it to construct a lining body.The shield machine is a lining body composed of assembled segments. It is designed to get a reaction force by jack and propell.

[0003]

As shown in FIGS. 7 and 8, when a shield machine is propelled by obtaining a reaction force by a jack 4 for advancing and retracting a rod 3 from a lining body 2 composed of a segment 1. FIG. In addition, the pressing force from the jack 4 acts slightly outward, whereby a tensile force is applied to the segment 1 between the sprayers 5 as the legs of the jack 4. In particular, when the segment 1 is made of concrete, cracks C are generated between the sprayers 5, and there is a possibility that the cracks C may cause water leakage. Further, when the sprayer 5 of the jack 4 is pressed, there is a possibility that the joint end face of the segment 1 is directly damaged by the sprayer 5. Note that reference numeral 6 in the figure denotes a skin plate constituting the shield machine.

[0004] The present invention has been made in view of the above circumstances, and provides a tunnel lining method capable of constructing a tunnel by a shield method without causing breakage or damage such as cracks in a segment. It is intended to provide.

[0005]

According to a first aspect of the present invention, there is provided a method for lining a tunnel, comprising the steps of: joining a plurality of arc-shaped segments to each other; A tunnel lining method using a shield machine for propelling while excavating the ground by obtaining a reaction force from a body by a jack, wherein the segment is assembled to a tip portion of the lining body and pressed by the jack. Is characterized in that a protection plate formed in advance in a flat plate shape is attached to the joint end surface of (1).

As described above, when the shield machine is propelled by obtaining the reaction force from the lining body by the jack, even if the bonding end face of the segments constituting the lining body is pressed by the jack, the bonding end face is protected. Since the board is attached,
Even when the jack is pressed and the pressing force acts outward, transmission of the tensile force generated between the jacks to the segments can be reliably prevented. Accordingly, it is possible to reliably prevent the occurrence of cracks at the joint end faces of the segments due to the tensile force generated between the jacks, and to construct a lining body that does not cause water leakage due to the cracks. Further, it is possible to prevent a scratch or the like from being made at a location pressed by the jack.

According to a second aspect of the present invention, there is provided the tunnel lining method according to the first aspect, wherein the segment includes a joining rod protruding from a joining end face on the digging side and a joining end face on the opposite side. A connector having an insertion hole to be inserted, a connector for engaging the connection rod inserted into the insertion hole is provided, and the protection plate includes a fixing rod body insertable into the insertion hole of the connector. The protection plate is attached to the joint end face of the segment by inserting the fixing rod into the joint of the segment.

That is, by inserting the fixing rod provided on the protective plate into the insertion hole of the connector provided on the joint end surface of the segment, the protective plate can be attached to the joint end surface of the segment very easily. The work can be facilitated and the construction period can be shortened.

According to a third aspect of the present invention, there is provided the tunnel lining method according to the first aspect, wherein the protection plate is provided with a magnet for magnetically attaching to the joint, and the magnet is attached to the segment. The protective plate is attached to the joint end face of the segment by magnetically attaching the joint to the segment.

As described above, the magnet provided on the protective plate is magnetically attached to the joint provided on the joint end surface of the segment, so that the protective plate can be mounted on the joint end surface of the segment very easily. In addition, the work can be facilitated, and the construction period can be shortened.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tunnel lining method according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 is a concrete segment, and reference numeral 12 is a protection plate. Segment 11 is
It is formed in a circular arc shape, and is joined to each other in the circumferential direction to form a ring. By connecting the rings to each other in the axial direction, a lining body is configured.

A joint plate 13 is provided on a joint end face 11A of the segment 11 in the circumferential direction.
These segments 11 are joined in the circumferential direction by fastening and fixing them with bolts and nuts. As shown in FIG. 2, a joining tool 15 is provided on one end of the joining end face 11 </ b> B in the axial direction, and a joining rod 16 is provided on the other. That is,
By joining these joining tools 15 and joining rods 16 to each other, the segments 11 are joined to each other in the axial direction.

Here, the joining tool 15 and the joining rod 16
Will be described. The joining tool 15 is a housing 21 formed in a cylindrical shape whose diameter gradually increases rearward.
A plurality of wedge bodies 22 disposed in the housing 21 in the circumferential direction; an elastic member 24 provided on the rear side of the wedge body 22 via a retainer 23; And a cap 25 held behind the body 22. The connector 15 has an insertion hole H formed on the inner peripheral side of the wedge 22 disposed in the housing 21.
It has been.

On the other hand, the joining rod 16 is formed of a rod body having a diameter larger than the insertion hole H of the joining tool 15, and has a threaded portion 27 formed at one end side embedded in the joining end face 11B of the segment 11. By screwing into the nut 26,
The segment 11 is attached so as to protrude from the joint end face 11B. The joining rod 16 has a saw-toothed portion 28 having a saw-toothed peripheral surface on the tip end side, and further has an insert nut 2 on its tip end surface.
A tool hole 29 into which a tool is inserted at the time of screwing into 6 is formed.

Then, by bringing the joining end faces 11B of the segments 11 close to each other so that the joining rod 16 is inserted into the insertion hole H of the joining tool 15, the joining rod 16 becomes
The wedge body 22 is pushed rearward while moving backward against the elastic force of the elastic member 24 and enters the insertion hole H. As a result, the joining rod 16 is fastened by the elastic force of the elastic member 24 and fastened by the wedge 22 urged by the inner peripheral surface of the housing 21 in the direction of reducing the diameter of the insertion hole H. Then, by inserting the joining rod 16 into the joining tool 15 and fastening the segments, the segments 11 are joined to each other in a state where the joining end surfaces 11B thereof abut against each other.

The protective plate 12 is made of, for example, a metal plate of stainless steel or the like having excellent corrosion resistance or a high-strength fiber plate of glass fiber, carbon fiber, steel fiber, or the like. It is about 2 mm. A plurality of fixing rods 31 are provided on the back surface side of the protection plate 12. These fixing rods 3
Numeral 1 is formed to have a smaller diameter than the insertion hole H of the joining tool 15, and as shown in FIG.
Is provided. These holders 32 include a cylindrical body 33 provided with a spring (not shown) therein, and a cylindrical body 33.
And an engaging ball 34 provided at the distal end of the engaging ball 34. The engaging ball 34 is protruded toward the distal end by a spring. Note that the engagement ball 34 is held so as not to fall off the cylindrical body 33.

The protective plate 12 is fixed by inserting the fixing rod 31 provided on the back surface thereof into the insertion hole H of the joint 15 provided on the joint end face 11B of the segment 11. The engagement ball 34 of the holder 32 of the rod 31 is engaged with the inside of the connector 15,
As shown in FIG. 4, it is configured to be attached to the joint end face 11B of the segment 11. Note that reference numeral 3 in FIG.
Reference numeral 5 denotes a sealing material that seals between the joint end surfaces 11A and 11B when the segments 11 are joined to each other.

Next, a case where the tunnel is lining using the above-mentioned protective plate 12 will be described. First, the protection plate 12 is attached to the joining end face 11B of the segment 11 which is already assembled and constitutes the ring of the lining body, and is joined to the joining end face 11B provided with the joining tool 15 for the next ring and the segment 11. Let it be. Thus, the segment 11 on which the protective plate 12 is mounted is connected to the connecting rod 16 by the connecting tool 15.
The segments 11 which are already assembled and constitute the ring of the lining body are joined by abutting against the joint end surfaces 11B in the axial direction, and these segments 11 are joined and fixed in the circumferential direction by bolts and nuts. Complete a new ring.

Thereafter, the sprayer 5 of the jack 4 is brought into contact with the joining end face 11B of the segment 11 on which the protection plate 12 is mounted while driving the cutter at the tip of the shield machine, and the jack 4 is driven to move the rod 3 Let it stretch. In this way, the shield machine
As a result, a reaction force is obtained from the lining body composed of the segments 11 and propelled.

Here, the segment 4 includes a jack 4
The protective plate 12 is mounted on the joint end face 11B pressed by the jack 4 when the sprayer 5 is in contact with the sprayer 5, so that when the jack 4 is pressed, the pressing force acts outward. Even if it does, the tensile force generated between the sprayers 5 is not applied to the segment 11 itself. That is, the segment 11 includes the protective plate 12
Thus, the generation of the crack C due to the tensile force generated between the sprayers 5 is reliably prevented.

When the shield machine has been propelled by a predetermined distance, the jack 4 is pulled in. Thereafter, the protective plate 12 is removed from the joint end face 11B of the segment 11, and the protective plate 12 is removed.
Is attached to the joint end face 11B of the segment 11 to be assembled next, and then the above operation is repeated.

As described above, according to the tunnel lining method described above, when the shield machine is propelled by the jack 4 to obtain a reaction force from the lining body, the joining end face 11B of the segment 11 constituting the lining body. Even if the jack 4 is pressed by the jack 4, the protection plate 12 is mounted on the joint end face 11B, so that the jack 4 is pressed and the pressing force acts outward, whereby the jacks 4 Transmission of the tensile force generated between the segments 11 can be reliably prevented.

Accordingly, it is possible to reliably prevent the crack C from being generated on the joint end face 11B of the segment 11 due to the tensile force generated between the jacks 4.
Thus, a lining body that does not cause water leakage can be constructed. Further, by inserting the fixing rod 31 provided on the protective plate 12 into the insertion hole H of the connector 15 provided on the joint end face 11B of the segment 11, the protective plate 12 can be extremely easily attached to the segment 11. Joint end face 1
1B, the work can be facilitated, and the construction period can be shortened. Further, it is possible to prevent a scratch or the like from being made at a position pressed by the jack 4.

Next, the protection plate 12 having a different mounting structure for the segment 11 will be described. The fixing plate 41 is provided on the back side of the protective plate 12 shown in FIG. The fixing rod 41 has a cylindrical body 42 having an internal thread formed on an inner peripheral surface thereof.
Inside, an enlarged diameter member 43 is provided. This enlarged diameter member 43 has a screw formed on the outer peripheral surface thereof.
It is screwed into the female screw of the cylinder 42.

The cylindrical body 42 has its distal end side divided into a plurality of parts in the circumferential direction by slits extending along the axial direction, and the inner peripheral surface at the distal end side is formed in a tapered shape that gradually narrows toward the distal end. It is a tapered portion 42a. Further, the enlarged diameter member 43 has a tapered portion 4 whose tip portion is formed in a tapered shape gradually narrowing toward the tip direction.
3a. A tool hole 44 is formed at the rear end of the diameter-enlarged member 43. A tool 46 is inserted from an insertion hole 45 formed in the protection plate 12, fitted into the tool hole 44, and rotated. As a result, the expanding member 43 is
2 to move.

When the enlarged diameter member 43 is rotated and moved toward the distal end of the cylinder 42, the tapered portion 43a at the distal end of the enlarged diameter member 43 comes into contact with the tapered portion 42a of the cylinder 42. Thereafter, the distal end side of the cylindrical body 42 is expanded in diameter. That is, in a state where the fixing rod 41 is inserted into the joining tool 15 on the joining end face 11B of the segment 11, the tool 46 is inserted from the insertion hole 45 to increase the diameter of the diameter increasing member 43.
The tip of the cylindrical body 42 is enlarged by the diameter-enlarging member 43 by being fitted into the tool hole 44 and rotated, whereby the fixing rod 41 engages with the connector 15 and the segment 11 The protection plate 12 is mounted on the joint end face 11B.

The protective plate 12 shown in FIG. 6 has, on the back surface thereof, an engaging projection 51 formed by punching or the like, and this engaging projection 51 is joined to the joining end face 11B of the segment 11 by joining. The protective plate 12 is mounted on the joint end face 11B of the segment 11 by fitting the fitting 15 into the entrance of the housing 21 of the tool 15.

It is to be noted that a magnet is provided on the back surface of the protection plate 12 and this magnet is attached to the joining end face 1 of the segment 11.
By magnetically attaching to the connector 15 provided in 1B,
The protection plate 12 may be attached to the joint end surface 11B of the segment 11. That is, in this case, the protection plate 12
By magnetically attaching the magnet provided on the joint 11 to the joint 15 provided on the joint end face 11B of the segment 11, the protection plate 12 can be extremely easily attached to the joint end face 11B of the segment 11. This facilitates the construction and shortens the construction period.

[0029]

As described above, according to the tunnel lining method of the present invention, the following effects can be obtained. According to the tunnel lining method of the first aspect, when the shield machine is propelled by obtaining a reaction force from the lining body by the jack, even if the joining end face of the segment constituting the lining body is pressed by the jack. , Since a protective plate is attached to the joint end surface, even if it is pressed by the jack and the pressing force acts outward, the transmission of the tensile force generated between the jacks to the segment is ensured. Can be prevented. Accordingly, it is possible to reliably prevent the occurrence of cracks at the joint end faces of the segments due to the tensile force generated between the jacks, and to construct a lining body that does not cause water leakage due to the cracks. Further, it is possible to prevent a scratch or the like from being made at a location pressed by the jack.

According to the tunnel lining method according to the second aspect, the fixing rod provided on the protection plate is inserted into the insertion hole of the connector provided on the joint end face of the segment, thereby being extremely easy. In addition, a protection plate can be attached to the joint end surface of the segment, and the work can be facilitated and the construction period can be shortened.

According to the tunnel lining method of the third aspect, the magnet provided on the protective plate is magnetically attached to the joint provided on the joint end surface of the segment, so that the protective plate can be extremely easily attached. The segment can be mounted on the contact end face of the segment, facilitating the operation and shortening the construction period.

[Brief description of the drawings]

FIG. 1 is a perspective view of a segment and a protection plate for explaining a tunnel lining method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a joint explaining a joint structure of segments to which a tunnel lining method according to an embodiment of the present invention is applied.

FIG. 3 is a cross-sectional view of a segment to which a protective plate is attached for explaining a tunnel lining method according to an embodiment of the present invention.

FIG. 4 is a perspective view of a segment on which a protective plate is mounted for explaining a tunnel lining method according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a segment to which another protective plate is attached for explaining a tunnel lining method according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a segment to which another protective plate is attached for explaining a tunnel lining method according to an embodiment of the present invention.

FIG. 7 is a sectional view of a lining portion for explaining a tunnel lining method by a shield method.

FIG. 8 is a cross-sectional view of a lining portion for explaining a tunnel lining method by a shield method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 Jack 11 Segment 11B Joining end face 12 Protective plate 15 Joiner 16 Joining rod 31, 41 Fixing rod H Insertion hole

Continuing on the front page (72) Inventor Hiroki Someya 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawashima Construction Materials Industry Co., Ltd. Industrial Co., Ltd. F term (reference) 2D055 BA01 CA01 GB01 GC04 GC05 KB00 LA06

Claims (3)

[Claims] 1. A tunnel machine using a shield machine for propelling while excavating the ground by obtaining a reaction force by a jack from a lining body assembled by joining the joining end surfaces of a plurality of segments of an arc plate shape to each other. A lining method, wherein a protection plate formed in advance in a flat plate shape is attached to a joint end surface of a segment that is assembled to a tip portion of the lining body and pressed by the jack. Tunnel lining method. 2. The segment has an insertion hole at a joint end surface on the excavation side into which a joint rod protruding from the joint end surface on the opposite side is inserted, and engages the joint rod inserted into the insertion hole. The protection plate is provided with a fixing rod that can be inserted into an insertion hole of the connector, and the protection rod is inserted into the connector of the segment, thereby securing the protection. The method according to claim 1, wherein a plate is mounted on the joint end surface of the segment. 3. The protection plate is provided with a magnet to be magnetically attached to the joint, and the magnet is magnetically attached to the joint of the segment so that the protection plate is attached to the joint end surface of the segment. The method for lining a tunnel according to claim 1, wherein the tunnel lining is performed.