JP2000257396A - Segment being divided body of steel tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine and a segment being a divided body of a steel tube which enable prevention of a positional slippage in the direction of the radius of a tunnel of the segments adjacent in the direction of the axis of the tunnel, simplification of the work for fitting of the segments and enhancement of the efficiency of the work and reduction of the amount of excavated earth. SOLUTION: A regulating mechanism 33 is provided for an existing segment Sa and a newly-provided segment and each regulating mechanism 33 is equipped with a regulating member 34 having a U-shaped section and an engaging member 35 engaging with the regulating member 34. By making the engaging member 35 engage with the regulating member 34, the segments adjacent in the direction of the axis of a tunnel are regulated firmly so that a positional slippage may not occur between them in the direction of the radius of the tunnel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe segment, and more particularly to a steel pipe segment having an arc-shaped cross section having a circumferential length obtained by dividing the inner circumferential surface of a tunnel into a plurality of sections. The present invention relates to a segment of a segment of a steel pipe to be lined while preventing positional deviation between segments adjacent in the center direction.

[0002]

2. Description of the Related Art A shield excavator is widely used as a drilling device for constructing various shield tunnels (water and sewage tunnels, subway tunnels, communication cable tunnels, tunnels for common ditch, etc.) by a shield method. ing. Generally, this shield excavator generally includes an excavator main body, a cutter head rotatably provided at a front end of the excavator main body, a driving mechanism for driving the cutter head to rotate forward and reverse, and an outer surface of the excavator main body. An erector arranged in the rear trunk for lining the tunnel inner surface with a plurality of segments each time a predetermined length is excavated in a tunnel axial direction (hereinafter, simply referred to as an axial direction), and a plurality of shield jacks. , And earth removal facilities. The shield jack takes a reaction force at the front end of the existing segment to make the shield machine excavate. The earth discharging facility has a function of carrying excavated soil excavated by the cutter head and muddy water containing the excavated soil to the ground.

Conventionally, a concrete segment or a steel skin having a predetermined length in the axial direction of the tunnel and a size obtained by dividing the inner peripheral surface of the tunnel into a plurality of sections (generally 6 or 7 sections) in the circumferential direction. A steel segment including a plate, a girder member, a rib, and the like is applied. The concrete segment and the steel segment have a predetermined thickness (a predetermined girder member height for the steel segment) (specifically, 1) in order to withstand the external pressure of earth and water.
(Thickness of about 00 to 175 mm) is applied.

When assembling the segment on the inner peripheral surface of the tunnel, the excavation of the tunnel is stopped every time the tunnel is excavated for a predetermined length (for one ring). Only the rod portion is retracted to form a gap at the segment assembling position. Other shield jacks react against existing segments to support earth pressure loads. That is, most of the plurality of shield jacks support the shield machine so that the shield excavator does not retreat due to the earth pressure applied to the cutter head.

Next, the segment is gripped by an erector,
Assemble the shield jack rod at the contracted position,
Next, the segment is pressed rearward by a shield jack corresponding to the segment, and is attached to the front end of the existing segment by pressing. In this way, a plurality of segments are sequentially assembled on the inner peripheral surface of the tunnel, a segment ring for one ring is assembled, and then tunnel excavation is resumed. The segments adjacent in the circumferential direction and the axial direction are connected by bolts and nuts by a bolt fastening device attached to the erector.

On the other hand, Japanese Unexamined Patent Publication No. Hei 10-148098 discloses a shield machine capable of remarkably simplifying the assembly of segments. In other words, in this shield machine, a ring-shaped steel pipe segment (hereinafter simply referred to as a steel pipe segment) having a predetermined length in the axial direction of the tunnel and divided at one location in the circumferential direction is applied. Lining the inner surface sequentially. In this shield machine, a gripper support pipe that extends through the inside of the trunk and extends rearward through the center of the tunnel, and an expansion device that is provided on the gripper support pipe so as to fit the steel pipe segment in the radially expanding direction, A grip device is provided.

[0007] The grip device includes two sets of grippers externally provided at the rear of the gripper support tube projecting rearward from the rear end of the rear trunk, and the grippers being capable of being axially moved to the gripper support tube. It has a supporting cylinder and a position switching mechanism for switching the axial position of the cylinder. The cylindrical body is slidably fitted to the gripper support tube, and when the two sets of grippers are brought into a grip function state, they are elastically deformed and become fixed to the gripper support tube. Each of the two sets of grippers has a hydraulic cylinder radially fixed at a position equally divided into four parts in the circumferential direction of the outer peripheral portion of the cylindrical body, and a grip member connected to a rod tip of the hydraulic cylinder.

When the piston rod of the hydraulic cylinder is extended, the four grip members come into close contact with the inner surface of the existing steel pipe segment, and the cylindrical body is elastically deformed to be in a gripping state. Is firmly fixed, so that the earth pressure load is transmitted from the gripper support pipe to the cylinder, transmitted to the grip member via the hydraulic cylinder, and transmitted to the existing steel pipe segment.

[0009]

When a normal segment (concrete segment or steel segment) divided into a plurality in the circumferential direction of the tunnel is applied, the number of segments is large and each segment is relatively small. Because of this, the load of the segment assembling work and the bolt joining work increases, and the segment assembling work requires a lot of labor,
The construction period of the tunnel excavation becomes longer and the construction cost becomes higher.
Moreover, since the thickness of the segment is large, a tunnel having an inner diameter of, for example, about 200 to 350 mm larger than the inner diameter of the segment ring must be excavated. Is required, and the excavation efficiency decreases.

In the shield machine and the steel pipe segment described in Japanese Patent Application Laid-Open No. 10-148098, when the segments are lined, the segments are assembled into a segment ring shape, and the ring segment is pressed rearward by all shield jacks. It will be moved to abut the front end of the existing segment. At the time of this segment lining, it is necessary to contract the rod part of all shield jacks, so that the shield machine does not recede due to earth pressure,
It is necessary to provide a gripper support tube, a grip device (having two sets of grippers) and the like, and the structure of the shield machine becomes complicated and expensive.

In view of this, a steel pipe segment obtained by dividing the steel pipe segment into a plurality of pieces in the circumferential direction is applied to a normal segment (a concrete segment or a steel segment).
It is also conceivable to assemble them in the same way. However, when assembling the steel pipe segment and abutting the existing segment on the front end, the thickness of the steel pipe segment in the tunnel radial direction is relatively small. It is easy for the body segment to be displaced in the radial direction of the tunnel, and it is not easy to eliminate the dislocation. When the dislocation is severe, there is a problem that water leakage may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent displacement of segments adjacent in the axial direction of the tunnel in the radial direction of the tunnel, simplify the operation of assembling the segments, improve the efficiency thereof, and reduce the amount of excavated soil. It is an object of the present invention to provide a shield machine and a steel pipe segment which can be reduced.

[0013]

A steel pipe segment according to claim 1 is a segment for lining the inner surface of a tunnel excavated by a shield machine, wherein the segment divides the inner periphery of the tunnel into a plurality in the circumferential direction. When the connecting end portions of the steel pipe segment segments adjacent to each other in the axial direction of the tunnel are connected in abutting manner, the connecting end portion of the segment has a tunnel diameter. A restricting mechanism for restricting the position from shifting in the direction is provided.

When the steel pipe segment is lined, the number of segments in the circumferential direction is plural, but the number of segments can be reduced to, for example, three or four, so that the work load for assembling the segments is reduced. In addition, the work efficiency of the segment assembling work can be improved. When connecting the connection end portions of the steel pipe segment segments adjacent to each other in the axial direction of the tunnel in abutting manner, the steel pipe segment segments are tightly regulated by the regulating mechanism so as not to be displaced in the tunnel radial direction. The segments can be assembled so that the inner surfaces of the segments do not become uneven. In addition, since the steel pipe segment is thin, the amount of excavated soil corresponding to the thickness of the segment is very small.

According to a second aspect of the present invention, in the invention of the first aspect, each of the regulating mechanisms includes a regulating member having a U-shaped cross-section fixed to an inner surface of a connection end of the segment. An engaging member fixed to the inner surface of the connection end of the steel pipe segment and engaged with the regulating member when the steel pipe segment is connected. When connecting the connection ends of steel pipe segment segments adjacent to each other in the direction of the tunnel axis,
By engaging a plurality of engaging members with the regulating member respectively, the steel pipe divided body segments adjacent in the tunnel axis direction are
It is tightly regulated so as not to shift in the radial direction of the tunnel.

According to a third aspect of the present invention, in the invention of the second aspect, the engaging member is connected to the inclined upper guide surface and the lower guide surface, and is connected to the upper guide surface to contact the regulating member from below. It is characterized by having an upper contact surface in contact with the lower guide surface and a lower contact surface in contact with the steel pipe segment segment on the opposite side from above and connected to the lower guide surface.

When the connection ends of the steel pipe segment segments adjacent to each other in the axial direction of the tunnel are butt-connected, the connection end of the new segment is located more inward in the tunnel radial direction than the connection end of the existing segment. If the position is shifted, the upper guide surface of the engaging member abuts the regulating member from below, and when the shield jack corresponding to the new segment is extended in this abutting state, the new segment follows the inclination of the upper guide surface. Moves so as to approach the existing segment side, and the upper contact surface of the engaging member contacts the regulating member from below.
Therefore, the positional deviation of the connection end portions of the steel pipe segment segments in the radial direction of the tunnel can be eliminated.

If the connection end of the new segment is displaced outward in the radial direction of the tunnel from the connection end of the existing segment, the lower guide surface of the engaging member comes into contact with the regulating member from above, and this contact is made. When the shield jack corresponding to the new segment is extended in the contact state, the new segment moves along the slope of the lower guide surface so as to approach the existing segment side, and the lower contact surface of the engaging member is moved from above to the regulating member. Abut Therefore, the positional deviation of the connection end portions of the steel pipe segment segments in the radial direction of the tunnel can be eliminated. Therefore, the continuity of the inner surfaces of the new segment and the existing segment is reliably ensured.

According to a fourth aspect of the present invention, in the invention of the third aspect, each of the restricting mechanisms comprises a plurality of U-shaped cross-section restricting members fixed to the inner surface of the connection end of the steel pipe divided segment. A rod-shaped member that engages with these restricting members and restrains the connection end portions of the steel pipe segment, and a restricting member and the engaging member while adjusting the relative positional relationship between the restricting member and the rod-shaped member. And an adjusting tool to be connected.

When the connection ends of the steel pipe segment segments adjacent in the axial direction of the tunnel are butt-connected, the connection end of the new segment is displaced in the radial direction of the tunnel from the connection end of the existing segment. If so, one rod-shaped member is engaged with each regulating member of the adjacent segment. Thereafter, the shield jack corresponding to the new segment is extended to bring the connection end of the new segment into contact with the connection end of the existing segment. Next, the relative positional relationship between the restricting member and the rod-shaped member is adjusted by an adjusting tool to eliminate the positional deviation between the connection ends and firmly restrain the new segment and the existing segment.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield machine and a steel pipe segment according to an embodiment of the present invention will be described below with reference to the drawings. Note that the front, rear, left, and right directions toward the excavation direction will be described as front, rear, left, and right.

As shown in FIGS. 1, 2 and 3, the shield machine 1 includes an excavator main body 2, a front trunk 2a and a rear trunk 2b on the outer surface of the excavator main body 2, and an excavator main body 2 A cutter head 3 rotatably provided at the front end of the head, a head drive mechanism 4 for rotating and driving the cutter head 3, for example, ten shield jacks 5, an erector 6,
It has an earth removal facility 7 and the like. The front trunk 2a and the rear trunk 2b are connected via a center bent part 8 and a plurality of center bent jacks 9, and the cutter head 3 has a plurality of cutter spokes 3a and a large number of cutter spokes 3a attached to the front end. And a copy cutter 3c for excavation are provided. The head drive mechanism 4 includes a plurality of hydraulic drive motors 4a and the like.
a fixed to the vertical partition 10 inside the cutter head 3
Is driven forward and reverse.

As shown in FIGS. 1 and 3, a plurality of brackets 11 are protruded along the inner surface of the rear trunk 2b, and a ring frame 12 is fixed to the front surfaces of these brackets 11. The shield jacks 5 are attached to the ring frame 12 at appropriate intervals in the circumferential direction so as to face backward. These shield jacks 5 are used when excavating existing segments Sa.
The excavator body 2 is excavated by taking a reaction force at the front end of the excavator. At the time of assembling the segments, the soil pressure load is supported by the existing segments Sa via some shield jacks 5.

As shown in FIGS. 1 and 3, a spreader 13b is connected to the rear end of the rod portion of the shield jack 5 via an eccentric fitting 13a. In addition, a substantially circular arc shape (in the case of this embodiment, 1
/ 3 circular arc shape), and the thrust of the four or three shield jacks 5 is transmitted to the segment via the press ring 13c.

As shown in FIG. 1 and FIG.
Is an erector body 14 and an erector drum 15 for rotating the erector body 14 around a tunnel axis.
And a drum drive motor 16 for rotating and driving the erector drum 15. The ring-shaped erector drum 15 is rotatably supported by a plurality of flanged guide rollers 19 attached to the plurality of brackets 11 via support members 17, and the guided portion 15a of the erector drum 15 has a plurality of flanged guides. It is supported by rollers 19. A chain member 15b is fixed to the inner peripheral surface of the erector drum 15, and a sprocket 16a of the drum driving motor 16 meshes with the chain member 15b to
5 is driven to rotate.

The erector main body 14 is connected to the erector drum 15 via a connecting member 20, and has a movable frame 21 and a segment holding portion 22. The erector body 14 is provided with a pair of left and right guide cylinders 23 fixed to the connecting member 20, and a hydraulic cylinder 24 for moving the movable frame 21 to the inner side of the tunnel is provided with each guide cylinder 2.
3 is provided on the rear side surface.

The movable frame 21 is a movable frame body 21.
a and a pair of left and right guide rods 21b, and the movable frame body 21a faces in a direction orthogonal to the tunnel axis,
The pair of left and right guide rods 21 b is
a, and protrudes in a direction orthogonal to both the movable frame main body 21a and the tunnel axis direction.
Each of the pair of guide rods 21b is a guide cylinder 23
The movable frame main body 21a is connected to the rod portion of the hydraulic cylinder 24.

Therefore, the movable rod 21 is driven by the hydraulic cylinder 24 so that the guide rod 21 b is
The movable frame body 21a moves in the tunnel radial direction (vertical direction in FIGS. 1 and 2). The segment gripper 22 is provided on the movable frame main body 21a so as to be finely adjustable in the front-rear direction by a hydraulic cylinder 25, and grips the segment transported by the transport trolley or the like to cover the inner surface of the tunnel.

As shown in FIG. 1, the soil discharging facility 7 has a screw conveyor 26 for carrying the excavated soil excavated by the cutter head 3 to the ground. Screw conveyor 26
The front end of the screw conveyor 26 is fixed to the partition wall 10 in a downwardly inclined shape and communicates with the chamber 27, and a hydraulic motor 28 for rotating the screw 26a is provided at the rear end of the screw conveyor 26. At the rearmost end of the screw conveyor 26 behind the hydraulic motor 28, a discharge port 29 is formed, and a hydraulic cylinder 30 that opens and closes the discharge port 29 is provided. Excavated soil excavated by the cutter head 3 and muddy water containing the excavated soil are introduced into the screw conveyor 26 from inside the chamber 27, and the hydraulic cylinder 30
And is discharged from the discharge opening 29 opened by the conveyor to the ground by a conveyor (not shown) or the like. When the shield excavator is the present muddy water shield excavator, a mud discharging facility is provided instead of the earth discharging facility 7.

As shown in FIGS. 3 and 4, the ring-shaped segment S is a steel pipe segment segment SA, SB having a circumferential length obtained by dividing the inner circumference of the tunnel into three substantially equally in the circumferential direction and having an arc-shaped cross section. , SK (hereinafter, segments SA, SB, S
K) and these segments SA, SB, S
K is manufactured by bending a steel plate having a thickness of, for example, 19 mm. The segment SA is disposed below the inner periphery of the tunnel in FIG.
The arc length is slightly longer than that. The segments SB and SK are disposed on the left and right of the inner periphery of the tunnel. That is,
The segments SA, SB, and SK are sequentially arranged counterclockwise to assemble one ring-shaped segment S.

As shown in FIGS. 4 and 5, the segment SA
, SB, and SK, flange joints 31 are formed at both ends, and adjacent flange joints 31 are bolts 32, respectively.
Are joined. In addition, the segment SA in a front view
, SK and the projecting direction of the flange joint portion 31 between the segments SB, SK are formed so that the segments are easily fitted to each other.

As shown in FIGS. 4 to 6, each segment S
A plurality of regulating mechanisms 33 are provided on the inner peripheral surfaces of A, SB, and SK. The regulating mechanism 33 connects the connection ends of the segments SA, SB, and SK adjacent in the axial direction of the tunnel to the existing segment Sa. When the ends are butt-connected, the connection ends of the segments SA, SB and SK are regulated so as not to be displaced in the tunnel radial direction. Note that the mounting positions of the segments SA, SB, and SK are not constant in the circumferential direction, but are sequentially shifted by a predetermined angle in a predetermined direction.

As shown in FIG. 6, each regulating mechanism 33 includes a gate-shaped regulating member 34 formed by cutting a channel steel, and an engaging member 35 that engages with the regulating member 34. The regulating member 34 is welded to the inner surface of the front connection end of each of the segments SA, SB, SK with its opening directed in the axial direction of the tunnel, and the engagement member 35 is connected to the rear connection end of the segments SA, SB, SK. It is welded to the inner surface of the portion at a position facing the regulating member 34, and engages with the regulating member 34 when the connection ends of the new segments SA, SB, SK are brought into contact with the connection ends of the existing segment Sa.

The engaging member 35 has an upper guide surface 35a, a lower guide surface 35b, an upper contact surface 35c, and a lower contact surface 35d. The upper guide surface 35a and the lower guide surface 35b are formed in an inclined shape approaching each other toward the tip. The upper contact surface 35c is connected to the upper guide surface 35a and contacts the regulating member 34 from below, and the lower contact surface 35d is connected to the lower guide surface 35b and contacts the inner surface of the existing segment Sa from above. In this way, the connection ends of the newly installed SA, SB, and SK and the connection end of the existing segment Sa are strongly regulated so as not to be displaced in the radial direction of the tunnel, and become substantially fixed.

Further, although not shown, in plan view,
The engagement member 35 has a left guide surface, a right guide surface, a left contact surface, and a right contact surface. The left guide surface and the right guide surface are formed so as to be inclined toward each other as they approach the distal end. The left abutment surface is connected to the left guide surface and the regulating member 3
4, and the right abutment surface is continuous with the right guide surface and abuts the regulating member 34 on the right inner surface. In this way, the new segments SA,
The positions of SB and SK are also restricted in the circumferential direction and are substantially fixed.

Next, the operation of the shield machine 1 will be described. At the time of tunnel excavation, thrust is generated by extending the rod portions of the shield jacks 5 while applying a reaction force to the front end of the existing segment Sa via the three press rings 13c by the ten shield jacks 5. Meanwhile, the tunnel is excavated by rotating the cutter head 3 by the plurality of hydraulic drive motors 4a. The excavated soil excavated by the cutter head 3 is introduced into the screw conveyor 26 from the inside of the chamber 27, discharged from the discharge port 29, and carried out to the ground by a transport conveyor (not shown) or the like. Each time one ring of the segment ring is excavated, the segments SA, S are applied to the inner surface of the excavated tunnel by the erector 6.
B, SK lining.

When the segments SA, SB and SK are laid on the inner surface of the excavated tunnel, the drive of the hydraulic drive motor 4a is stopped and the excavation is stopped. Next, only the rod portions of the four shield jacks 5 corresponding to the lining positions of the segments SA are retracted. Next, the segment SA is assembled by the erector 6, the rod portions of the four shield jacks 5 are extended, and the segment SA is pressed and moved backward to abut the front end of the existing segment Sa.

At this time, by engaging the plurality of engaging members 35 with the plurality of restricting members 34, respectively, the segment SA adjacent to the tunnel axial direction and the existing segment Sa are firmly restricted in position, and are substantially fixed. Become. If the newly installed segment SA is displaced inward of the existing segment Sa in the radial direction of the tunnel, the upper guide surface 35 of the engaging member 35 is displaced.
a contacts the regulating member 34 from below, and the upper guide surface 35a
The segment SA moves so as to approach the existing segment Sa side along the inclination of, and the segment SA and the existing segment Sa are brought into a state in which the inner surfaces thereof coincide with each other.

If the segment SA is displaced outward in the radial direction of the tunnel from the existing segment Sa, the lower guide surface 35b of the engaging member 35 comes into contact with the inner surface of the segment Sa from above, and the lower guide surface 35b The segment SA moves along the inclination so as to approach the existing segment Sa, and the inner surface of the segment SA coincides with the existing segment Sa. Thereafter, the segments SB and the segments SK are assembled in this order, and the adjacent flange joints 31 are joined by bolts 32, so that one ring of the segment ring can be covered.

Thus, the newly established segments S A and S
Even if B and SK are displaced in the radial direction of the tunnel immediately before lining with respect to the existing segment Sa, the displacement can be eliminated and the segments SA, SB and SK can be strongly regulated.
And the continuity of the inner surface of the existing segment Sa can be ensured. As a result, even if a large earth pressure load acts on the lining of the segments SA, SB and SK, the existing segment S
The connection ends of the segments a, SB, and SK to be newly provided are stably held without displacement in the radial direction of the tunnel. In addition, 10 shield jacks 5 during tunnel excavation
Accordingly, even when a reaction force is applied to the front end of the existing segment Sa via the three press rings 13, the connection end is maintained in a stable state without being displaced in the tunnel radial direction.

The above segments S A, S B and S K are 3
Since it is wrapped in a ring shape by itself, segment handling, positioning,
Work loads such as assembling and bolt connection are remarkably reduced, so that tunnel excavation costs can be reduced and the construction period can be shortened. In addition, the production costs of the segments SA, SB and SK themselves are significantly reduced as compared with ordinary segments (concrete segments and steel segments). The thickness of the segments SA, SB, and SK is about 19 mm, which is very thin. Therefore, the amount of excavated soil for tunnel excavation is reduced by the reduced thickness of the segments, and the cost of tunnel excavation is considerably large. Reduce.

Next, a description will be given of a modification of the regulating mechanism which replaces the regulating mechanism 33 or is used together with the regulating mechanism 33. 1] As shown in FIGS. 7 to 9, a plurality of regulating mechanisms 33A
Are provided on the inner peripheral side of the segment S at appropriate intervals in the circumferential direction. Each regulating mechanism 33A includes a plurality of regulating members 36 formed by cutting the channel material, a rod-shaped member 37 that is inserted into and engaged with these regulating members 36, and a plurality of bolts 38. The plurality of restricting members 36 are welded to the inner surfaces of the connection ends of the segments SA, SB, and SK with their openings directed in the axial direction of the tunnel. The top wall of the regulating member 36 has a screw hole 3
6a and a through hole 36b are formed, and a bolt 38 (corresponding to an adjusting tool) is screwed into the screw hole 36a.
A bolt 38 is inserted through 6b.

For example, a rod-shaped member 37 having a rectangular cross section is inserted through three regulating members 36 arranged in the axial direction of the tunnel, and restrains the connection ends of the newly provided segments SA, SB, SK and the existing segment Sa. I do. This rod-shaped member 37
Are formed with a plurality of screw holes 37a in a predetermined arrangement pattern, a bolt 38 screwed into the screw hole 36a is brought into contact with the upper surface of the rod-like member 37, and a bolt 38 provided in the through hole 36b is provided. Is screwed into the screw hole 37a. The segments SA, SB, and SK are connected to the existing segment Sa at the rear connection end of the inner peripheral surface of each of the segments SA, SB, and SK.
A guide member 39 is provided to project rearward at appropriate intervals in the circumferential direction.

Next, the operation of the regulating mechanism 33A will be described. When lining the newly installed segment SA, if this segment SA is displaced inward of the existing segment Sa in the radial direction of the tunnel, the new segment SA is inserted with the rod-shaped member 37 inserted into the three regulating members 36. When the tip of the bolt 38 screwed into the screw hole 37a on the side is brought into contact with the segment SA and the screw 38 is continuously screwed,
Since the segment SA is pressed outward with respect to the rod-shaped member 37, the positional deviation can be eliminated. The rod-shaped member 37 and the existing segment Sa are connected to a plurality of bolts 38.
It is assumed that there is a fixed relationship due to the adjustment of.

If the newly provided segment SA is displaced outward in the radial direction of the tunnel from the existing segment Sa, the screw hole 3 of the regulating member 36 on the newly provided segment SA side is provided.
If the bolt 38 is continued to be screwed in a state where the tip of the bolt 38 screwed to 6a is in contact with the rod-like member 37, the segment SA is pulled inward with respect to the rod-like member 37. Can be eliminated. However,
As the rod-like member 37, a high-rigidity member that does not bend due to the pressing force of the bolt 38 or the like is used. The other operations and effects are the same as those of the above-described embodiment.

2] As shown in FIG. 9, the regulating mechanism 33B
Are a plurality of substantially rectangular regulating members 39 projecting forward from the inner peripheral surface of the front connection end of the segments SA and Sa.
A tapered portion 40a formed on the front end face of the front connection end of the segment Sa and going inward toward the rear;
, SB, and SK are formed at the rear connection ends, and have a tapered portion 40b that goes inward toward the rear. Each of the regulating members 39
Is formed at the front end with a tapered portion 39a which goes outward toward the rear. A plurality of regulating members 39 similar to those shown in the figure are provided forward on the inner peripheral surface of the front connection end of each of the new segments SA, SB, and SK.

In order to form the tapered portion 40b, when the new segments SA, SB, and SK are assembled and moved rearward by the shield jack 5, the tapered portions 40a, 4
Since the gravel is less likely to be trapped between 0b, the work efficiency of assembling the new segments SA, SB, and SK can be improved. When the new segments SA, SB, and SK are assembled and moved rearward by the shield jack 5, the tapered portion 4
0a, 40b and the taper portions 40b, 3
By the guide restricting action 9a, the connecting ends of the segments SA, SB, SK and the segment Sa are strongly restricted so as not to be displaced in the radial direction, and the inner surfaces of both segments are surely flush with each other.

Next, a description will be given of a modification in which the above-described embodiment is partially modified. 1) In the above-described embodiment, the case where a segment obtained by dividing the inner surface of the tunnel into three in the circumferential direction is used as an example, but the circumferential length obtained by dividing the inner surface of the tunnel into two, four, and five in the circumferential direction is defined as A steel pipe segment having an arcuate cross section may be used. Note that three or four divisions are desirable in terms of economy and the like, and among them, three divisions are the best. 2) In the above embodiment, the case where the segments are moved by the plurality of shield jacks 5 via the press ring 13c has been described as an example. However, the segments may be pressed by the plurality of spreaders 13b without using the press ring 13c.

3) In the regulating mechanism 33A, the regulating member 3
Instead of the bolt 38 screwed into the screw hole 36a of No. 6,
It is also possible to drive a wedge-shaped member between the regulating member 36 and the rod-shaped member 37. 4) In the above-described embodiment, an example has been described in which the assembling positions of the segments SA, SB, and SK are sequentially changed in the circumferential direction. However, the assembling positions of the segments SA, SB, and SK are not changed in the circumferential direction. It may be assembled. In addition, it is needless to say that the present invention can be embodied in a form in which various changes are added to the embodiment without departing from the spirit of the present invention.

[0050]

According to the steel pipe segment according to the first aspect of the present invention, the inner circumference of the tunnel has a circular arc shape having a circumferential length obtained by dividing the inner circumference into a plurality of pieces in the circumferential direction.
Since the number of segments covering the ring is small, the work load such as handling, positioning, assembling, and bolt connection of the segments is remarkably reduced. The steel pipe segment has a small thickness, and the amount of excavated soil is reduced by the reduced thickness of the segment, so that the cost of tunnel excavation can be reduced. In addition, a plurality of regulating mechanisms are provided to regulate the connection end of the existing segment and the new segment adjacent to each other in the axial direction of the tunnel so as not to be displaced in the radial direction of the tunnel, so that a step is formed at the connection point between the existing segment and the new segment. Can be connected in the same plane so as not to cause the inside, and the inside view of the tunnel inner surface and the water stopping performance can be improved.

According to the steel pipe segment according to the second aspect, each of the regulating mechanisms is fixed to the inner surface of the connecting end of the segment and the regulating member having a U-shaped cross section fixed to the inner surface of the connecting end of the segment. Since the engaging member engages with the regulating member, the engaging member is engaged with the regulating member, so that the segment adjacent in the axial direction of the tunnel is strongly restrained by the regulating mechanism having a simple structure. Can be regulated. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, if the connection end of the new segment is displaced inward of the connection end of the existing segment in the radial direction of the tunnel,
The upper guide surface of the engaging member contacts and guides the regulating member,
The radial position of the new segment is made to coincide with the existing segment. If the connection end of the new segment is displaced outside the connection end of the existing segment in the radial direction of the tunnel, the lower guide surface of the engaging member contacts and guides the existing segment, and the new connection to the existing segment is established. Match the radial positions of the segments. The other effects are the same as those of the first aspect.

According to the steel pipe segment according to the fourth aspect, since each regulating mechanism has a plurality of regulating members, a rod-shaped member, and a plurality of adjusting tools, the relative positional relationship between the regulating member and the rod-shaped member is determined. The new segment and the existing segment are firmly restrained while adjusting the position of the connecting ends of the segments by adjusting with the adjuster, so even if the new segment is displaced in the tunnel radial direction, it can be easily positioned by the adjuster. Deviation can be eliminated. The other effects are the same as those of the first aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of the shield machine.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an enlarged view of the segment ring of FIG. 3;

FIG. 5 is an enlarged view of a main part of FIG. 4;

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a diagram corresponding to FIG. 6, showing a regulating mechanism according to a modified embodiment.

FIG. 8 is an enlarged sectional view of a main part of the regulating mechanism of FIG. 7;

FIG. 9 is a cross-sectional view illustrating another regulating mechanism according to a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Excavator main body 2a Front trunk 2b Rear trunk 3 Cutter head 4 Head drive mechanism 5 Shield jack 6 Elector S segment Sa Existing segment SA, SB, SK Steel pipe segment segment 33, 33A, 33B Regulation mechanism 34 Regulation member 35 engagement member 35a upper guide surface 35b lower guide surface 35c upper contact surface 35d lower contact surface 36 regulating member 37 rod-shaped member 38 bolt 39 regulating member 39a taper portion 40a, 40b taper portion

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[Procedure amendment]

[Submission date] December 7, 1999 (1999.12.
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

A steel pipe segment according to claim 1 is a segment for lining an inner surface of a tunnel excavated by a shield machine, wherein the segment is formed by cutting a ring-shaped steel pipe segment around a tunnel inner periphery. The steel pipe segment has an arc-shaped cross-section having a circumferential length divided into a plurality of segments in the circumferential direction, and when the connection end portions of the steel pipe segment segments adjacent in the axial direction of the tunnel are butt-connected, the A regulating mechanism for regulating the connection end so as not to be displaced in the tunnel radial direction is provided .
The regulating mechanism is located on the inner surface of the connection end of the steel pipe segment.
The fixed U-shaped cross-section regulating member and the steel pipe split
Segment attached to the inner surface of the connection end of the segment.
An engagement member that engages with the regulating member when connecting the
It is characterized in that the.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

When the steel pipe segment is lined, the number of segments in the circumferential direction is plural, but the number of segments can be reduced to, for example, three or four, so that the work load for assembling the segments is reduced. In addition, the work efficiency of the segment assembling work can be improved. When the connecting ends of the steel pipe segment segments adjacent to each other in the axial direction of the tunnel are connected to each other in abutting manner , engagement is made in each regulating mechanism.
By engaging the members with the regulating members respectively,
The connection ends of the steel pipe segment segments adjacent in the direction are tightly regulated so as not to be displaced in the radial direction of the tunnel, so that the segments can be assembled so that the inner surface of the segment does not become uneven. it can. In addition, since the steel pipe segment is thin, the amount of excavated soil corresponding to the thickness of the segment is very small.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

The steel split body segment according to claim 2 is the invention of claim 1, wherein the engagement member includes a sloped upper guide surface and a lower guide surface, from below the regulating member continuous with the upper guide surface equivalent It is characterized by having an upper contact surface in contact with the lower guide surface and a lower contact surface in contact with the steel pipe segment segment on the opposite side from above and connected to the lower guide surface.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The steel split body segment according to claim 3, Sea
To cover the inner surface of the tunnel excavated by the
Segment, the segment is a ring-shaped steel pipe.
The circumference where the segment is divided into multiple parts in the circumferential direction of the inner circumference of the tunnel
From an arc-shaped section of a steel pipe segment
Steel pipe segment adjacent to the tunnel axis direction
When connecting the connection ends of
The connection end of the cable does not shift in the radial direction of the tunnel.
The regulating mechanism for regulating the provided, each restricting mechanism includes a plurality of regulating members of U-shaped cross section which is secured to the inner surface of the connection end portion of the steel pipe divided body segments, engaging steel split body segments thereto regulating member And a regulating member for connecting the regulating member and the rod-shaped member while adjusting the relative positional relationship between the regulating member and the rod-shaped member. Things.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050]

According to the segmented steel pipe segment of the first aspect , the ring-shaped steel pipe segment has a circular arc shape having a circumferential length obtained by dividing a plurality of circumferentially the inner circumference of the tunnel. Since the number of segments covering one ring is small, work loads such as handling, positioning, assembling, and bolting of the segments are remarkably reduced. The steel pipe segment has a small thickness, and the amount of excavated soil is reduced by the reduced thickness of the segment, so that the cost of tunnel excavation can be reduced.
In addition, a plurality of regulating mechanisms are provided to regulate the connection end of the existing segment and the new segment adjacent to each other in the axial direction of the tunnel so as not to be displaced in the radial direction of the tunnel, so that a step is formed at the connection point between the existing segment and the new segment. Can be connected in the same plane so as not to cause the inside, and the inside view of the tunnel inner surface and the water stopping performance can be improved. Each regulatory mechanism
Is a U-shaped cutout secured to the inner surface of the connection end of the segment.
Surface and the inner surface of the connection end of the segment
And an engagement member that engages with the restriction member.
By engaging the joint member with the regulating member, the regulation of a simple structure
The segments adjacent to each other in the axial direction of the tunnel
Can be restricted to a state in which it is strongly restrained.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Deleted

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction contents]

[0052] According to the steel pipe divided body segment of claim 2, if the connection end of the new segment long as the positional deviation in the tunnel radially inward of the connecting end of the existing segment,
The upper guide surface of the engaging member contacts and guides the regulating member,
The radial position of the new segment is made to coincide with the existing segment. If the connection end of the new segment is displaced outside the connection end of the existing segment in the radial direction of the tunnel, the lower guide surface of the engaging member contacts and guides the existing segment, and the new connection to the existing segment is established. Match the radial positions of the segments. The other effects are the same as those of the first aspect.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction contents]

According to the steel pipe segment according to the third aspect , since each regulating mechanism has a plurality of regulating members, a rod-shaped member, and a plurality of adjusting tools, the relative positional relationship between the regulating member and the rod-shaped member is determined. The new segment and the existing segment are firmly restrained while adjusting the position of the connecting ends of the segments by adjusting with the adjuster, so even if the new segment is displaced in the tunnel radial direction, it can be easily positioned by the adjuster. Deviation can be eliminated. The other effects are the same as those of the first aspect.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Shimizu 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Koji Bandoh Inventor 2--4 Hamamatsucho, Minato-ku, Tokyo No. 1 World Trade Center Building Kawasaki Heavy Industries, Ltd. Tokyo Head Office (72) Inventor Shunichi Masuda 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Inventor Tadashi Teramoto Chiyoda-ku, Tokyo 2-3-2 Uchisaiwai-cho, Kawasaki Steel Corp. (72) Inventor Hiroyuki Imashio 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corp. (72) Hiroyuki Kawaguchi Shibaura, Minato-ku, Tokyo 1-2-3 Shimizu Corporation (72) Inventor Ryunosuke Kashima 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-ta None (reference) 2D055 GC04 KB04

Claims (4)

[Claims] 1. A segment for lining the inner surface of a tunnel excavated by a shield machine, wherein the segment is a steel pipe segment having an arc-shaped cross section and having a circumferential length obtained by dividing the inner periphery of the tunnel into a plurality of portions in a circumferential direction. When the connecting ends of the steel pipe segment segments adjacent to each other in the axial direction of the tunnel are connected in abutting manner, a regulating mechanism is provided to regulate the connecting ends of the segments so as not to be displaced in the tunnel radial direction. A steel pipe split body segment, characterized in that: 2. Each of the regulating mechanisms includes a regulating member having a U-shaped cross-section fixed to an inner surface of a connection end of the steel pipe segment, and a regulating member fixed to an inner surface of a connection end of the steel pipe segment. 2. An engaging member which engages with said regulating member when connecting a body segment.
2. The steel pipe segment according to item 1. 3. The engagement member includes an inclined upper guide surface and a lower guide surface, an upper contact surface connected to the upper guide surface and in contact with the regulating member from below, and a mating side connected to the lower guide surface. The steel pipe segment according to claim 2, further comprising a lower contact surface that comes into contact with the steel pipe segment from above. 4. Each of the restricting mechanisms includes a plurality of U-shaped cross-section restricting members fixed to the inner surface of the connecting end of the steel pipe segment, and the connecting ends of the steel pipe split segments engaged with these restricting members. A bar-shaped member for restraining the parts, and an adjusting tool for connecting the regulating member and the engaging member while adjusting the relative positional relationship between the regulating member and the rod-shaped member. 4. The steel pipe segment according to 3.