JP3264436B2 - Steel pipe segment - Google Patents

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 for lining an inner surface of a tunnel excavated by a shield machine, and more particularly to a steel pipe having a simplified peripheral equipment for transporting a steel pipe segment and having excellent assemblability. Regarding segments.

[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 device disposed in the rear trunk for sequentially lining the inner surface of the tunnel with a plurality of segments each time a predetermined length of digging is performed in a tunnel axial direction (hereinafter, simply referred to as an axial direction); When,
It has an earth removal facility. 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.

Heretofore, a concrete segment having a predetermined length in the axial direction of the tunnel and a size obtained by dividing the inner circumferential surface of the tunnel into a plurality of sections (generally 6 or 7 sections) in the circumferential direction has been applied as the segment. Has been
A large number of joints including bolts are required to assemble segments for rings, and the greater the number of divisions in bolt joint work, the greater the load, so the excavation stop time of the shield excavator required for assembly of the segments There was a problem that it was longer and the construction period was longer. Therefore, instead of the concrete segment, a steel pipe segment having a relatively small number of parts and excellent in assemblability has been proposed.

For example, Japanese Patent Application Laid-Open No. H10-140995 discloses that a C-shaped segment having a C-shaped cross section in which a ring is divided into two in the circumferential direction and an arc-shaped segment having an arc-shaped cross section are joined together by bolts to provide one ring. Techniques for assembling steel pipe segments are described. Since the radius of curvature of the C-shaped segment is set to be substantially the same as the radius of curvature of the inner surface of the tunnel in the free state, the C-shaped segment is always kept in a reduced state before being assembled to the inner surface of the tunnel, such as during transportation. A holding jig is required.

Further, the above publication discloses a slit pipe in which a ring-shaped steel pipe having a diameter smaller than the tunnel diameter is provided with one axially oriented slit (divided portion) in a circumferential direction. The diameter is previously expanded to form a C-shaped segment having substantially the same dimension as the radius of curvature of the inner surface of the tunnel, and the C-shaped segment and the arc-shaped segment are joined by bolts via both flange portions to assemble into one ring-shaped steel pipe segment. The technology is described.

[0006]

Problems to be Solved by the Invention
In the steel pipe segment disclosed in Japanese Patent No. 40995, the C-shaped segment must be always kept in a reduced diameter state before assembling it to the inner surface of the tunnel, such as during transportation, and the connecting jig of the C-shaped segment is held in the holding jig by the reduced diameter. It is necessary to keep the C-shaped segment elastically deformed. Since the handling of the C-shaped segment before assembling becomes complicated as described above, peripheral equipment becomes complicated, and there is a problem in terms of safety if the reduced diameter state of the C-shaped segment is suddenly released.

In a steel pipe segment provided with a slit tube, the diameter of the C-shaped segment is previously expanded by a diameter expanding device so that the radius of curvature of the C-shaped segment is substantially the same as the radius of curvature of the inner surface of the tunnel. In the diameter state, it must be transported in the tunnel and joined with the arc-shaped segment. Therefore, there are problems that the diameter expanding device is complicated and the cost of peripheral equipment is high. Furthermore, since the C-shaped segment is joined to the arc-shaped segment while finely adjusting the diameter-expanded state of the C-shaped segment by the diameter-expanding device, the assemblability is poor and the work efficiency is poor.

An object of the present invention is to provide a steel pipe segment which is excellent in assemblability by simplifying peripheral equipment for transporting the steel pipe segment.

[0009]

A steel pipe segment according to claim 1 is a steel pipe segment for lining an inner surface of a tunnel excavated by a shield machine, and a steel pipe segment for one ring is formed by extending the ring in a circumferential direction. Cross section C divided into two
Having a curved C-shaped segment and an arc-shaped segment having an arc-shaped cross section, wherein the radius of curvature of the C-shaped segment in a free state before being assembled to the inner surface of the tunnel is determined by the radius of curvature of the steel pipe segment assembled to the inner surface of the tunnel. At the circumferential connection end of the C-shaped segment and the arc-shaped segment, a piece-to-piece insertion joint for regulating the adjacent segment so as not to be displaced in the radial direction of the tunnel is provided. Adjacent segments are not displaced in the radial direction of the tunnel between the axial connection end of the C-shaped segment connected to each other and the axial connection end of the arc-shaped segment connected to each other adjacent in the tunnel axial direction. the restriction rings between bayonet joints respectively provided so as, between said piece insertion passage
Hand is the inwardly inclined end of the circumferential connection end of the C-shaped segment
Surface segment and an arcuate segment engaging the inwardly inclined end surface thereof
And the C-segment
Segment is fixed to the inner surface of the circumferential connection end of the
A regulating plate for regulating the ring from the inside,
The joint is the axial direction of the C-shaped segment or arc-shaped segment
Formed at the connection end on the tunnel face side
Inwardly inclined end face and connection on the side opposite to the tunnel face
An outwardly inclined end face formed at the end, and a C-shaped segment
Or tunnel at the axial connection end of the arc segment
An adjacent segment fixed to the inner surface of the connection end on the face side
And a regulating plate for regulating the pressure from the inside .

When lining the inner surface of the tunnel with a steel pipe segment, the excavation of the shield machine is stopped, and the soil water pressure load received from the front end of the shield machine is applied to the reinforced segment via, for example, a reaction force stopper device. receive. next,
For example, the arc-shaped segment is temporarily placed at a predetermined position in order to be supplied to the erector device, and in this state, the C-shaped segment is supplied to the erector device and assembled to the reinforced steel pipe segment. Next, the arc-shaped segment is pushed by a plurality of shield jacks and assembled into a C-shaped segment to form a ring.

In particular, the radius of curvature of the C-shaped segment in the free state is set smaller than the radius of curvature of the steel pipe segment assembled on the inner surface of the tunnel, and the distance between the pieces that regulates the adjacent segments so as not to shift in the radial direction of the tunnel. Since the insertion joint is provided, the C-shaped segment can be engaged with the arc-shaped segment while being elastically deformed in the radially expanding direction to form a ring-shaped steel pipe segment. It is not necessary to hold the C-shaped segment firmly in the reduced diameter state during the transfer, and for example, it is easy to transfer the C-shaped segment from the segment transfer device to the erector device, and the structure of the transfer system is also simplified. Further, the steel pipe segments adjacent in the axial direction can be smoothly connected to each other by the inter-ring insertion joint .

Further, the radius of curvature of the arc-shaped segment is set larger than the radius of curvature of the C-shaped segment of a free state,
When the C-shaped segment and the arc-shaped segment are engaged with each other, the radius of curvature of the two becomes the same, so that the inwardly inclined end face portion of the C-shaped segment is positioned outside the arc-shaped segment in a state where the C-shaped segment is elastically deformed. The arcuate segment can be prevented from coming inward by the regulating plate by engaging with the direction inclined end surface .

Further, when the C-shaped segment and the arc-shaped segment are laid on the face side following the reinforced segment, an outwardly inclined end face on the side opposite to the tunnel face with respect to the inwardly inclined end face on the tunnel face side. The C-shaped segments or the arc-shaped segments can be prevented from being displaced and dislocated in the radial direction of the tunnel by the regulating plate.

According to a second aspect of the present invention, in the steel pipe segment according to the first aspect , a seal member is mounted between the inwardly inclined end face and the outwardly inclined end face of the bayonet joint. . The sealing member of the insertion joint enhances the water stoppage and can prevent the inflow of water from the ground.

[0015] The steel pipe segment of the third aspect is the first or second aspect.
In the invention according to the second aspect , the arc-shaped segment is formed in a substantially trapezoidal shape in which the circumferential width is wide on the tunnel face side and narrow on the side opposite to the tunnel face side. The arc-shaped segment can be inserted between the pair of inwardly inclined end faces of the C-shaped segment by a shield jack. At this time, since the arc-shaped segment is formed in the trapezoidal shape as described above, even if the arc-shaped segment is slightly displaced in the circumferential direction, the arc-shaped segment can be easily inserted while eliminating this displacement. .

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a steel pipe segment lining the inside of a tunnel excavated by the shield machine 1 shown in FIG. 1 will be described. First, the shield machine 1 will be described, and then the steel pipe segment will be described. The front, rear, left and right directions when facing the excavation direction will be described as front, rear, left and right directions.

As shown in FIG. 1, the shield machine 1
An excavator body 2, a front trunk 3 and a rear trunk 4 on the outer surface of the excavator body 2, a cutter head 5 rotatably provided at a front end of the excavator body 2, and a rotational drive of the cutter head 5 A head drive mechanism 6, a plurality of shield jacks 7, an erector device 8, an earth discharging facility 11 including a screw conveyor 9, a belt conveyor 10, and the like. The head drive mechanism 6 includes a plurality of hydraulic motors 6 a and the like, and is integrally fixed to a vertical partition wall 12 inside the front body 3 to drive the cutter head 5 to rotate forward and reverse. The front end of the screw conveyor 9 is fixed to the partition wall 12 so as to be inclined downward and forward and communicates with the chamber 13, and the rear end of the screw conveyor 9 having the discharge port 9 a is connected to the belt conveyor 10. .

As shown in FIGS. 1 and 2, a ring web 14 is projected from the inner surface of the rear trunk 4, and a plurality of shield jacks 7 are mounted on the ring web 14 rearward at appropriate intervals in the circumferential direction. Have been. These shield jacks 7
During the excavation, a reaction force is applied to the front end of the reinforced steel pipe segment 15 to move the excavator body 2 forward, and the steel pipe segment 1
During 5 assembling the causes rearward movement to press the front end of <br/> steel pipe segments 15 assembled in erector device 8.
At the time of this assembling, the soil water pressure acting on the cutter head 5 is applied to the reinforced steel pipe segment 15 via the reaction force receiving stopper device 16 and the screw conveyor 9 disposed inside the reinforced steel pipe segment 15. It has come to support.

As shown in FIGS. 1 and 10, the reaction force receiving stopper device 16 has a support cart 17, a reaction force receiving stopper 18, and a connecting member 19. A total of four wheels 17a are provided on the lower surface of the support trolley 17, one on the front and one on the left and right.
On the inner surface of the reinforced steel pipe segment 15, a pair of rails 20 are laid in parallel along the excavation direction,
7 is movably mounted on a pair of rails 20 by wheels 17a, and a reaction force receiving stopper 18 is
7 supported. The reaction force receiving stopper 18 is configured to extend and contract a pair of left and right stopper members 18a which can be extended and contracted left and right by a pair of hydraulic cylinders (not shown).
By strongly pressing the stopper members 18a against the inner surface of the reinforced steel pipe segment 15, the soil water pressure load can be supported by the reinforced steel pipe segment 15 as described above. In order to fix the support trolley 17 to the excavator main body 2, the support trolley 17 is connected to the screw conveyor 9 by a connecting member 19 so that the connection can be appropriately released.

As shown in FIGS. 1, 2 and 15, an expansion device 21 is provided on the erector body 8a of the erector device 8, and the expansion device 21
It has a function of holding the mold segment 22 and changing the diameter from the free state to the expanded state. A segment conveyor 23, such as a roller conveyor, is installed rearward from the upper portion of the reinforced steel pipe segment 15 near the erector unit 8, and a segment conveyor truck 24 is located behind the segment conveyor 23. It is installed so that it can move in the direction. still,
A plurality of rear bogies 2 are provided below the segment transport device 23.
5 are connected to each other in the front-rear direction and are installed so as to be movable on rails 20. On the upper surface of the rear bogie 25, a belt conveyor 10 that conveys earth discharging is installed. Each rear trolley 2
A work passage is formed by protruding a frame member 25a having a substantially L-shaped cross section on the side surface of the fifth member.

As shown in FIG. 1 and FIG. 7, the segment transport cart 24 has a transport frame 26, wheels 27, and segment holding rods 28. The transfer frame 26 is formed along the inner surface of the reinforced steel pipe segment 15 in a substantially C shape in a front view and in a substantially rectangular shape in a side view. The transport frame 26 is disposed with the C-shaped opening facing downward, and the wheels 2 provided near the C-shaped opening end of the transport frame 26 are provided.
7 allows the transport frame 26 to move in the front-rear direction, and a plurality of main body holding rods 28 project forward from the front end of the transport frame 26. 29 is piping, 30
Are support members such as piping 29.

Next, the steel pipe segment 15 will be described. As shown in FIGS. 3 and 4, the steel pipe segment 15 for one ring has a C-shaped segment 22 having a C-shaped cross section obtained by dividing the ring into two in the circumferential direction, and an arc-shaped segment 31 having an arc-shaped cross section. . In order to facilitate the transport of the C-shaped segment 22 in the tunnel, the radius of curvature of the free-form C-shaped segment 22 before assembly on the inner surface of the tunnel is larger than the radius of curvature of the steel pipe segment 15 assembled on the inner surface of the tunnel. It is set small.

As shown in FIGS. 3, 4 and 5, at each of the circumferential connection ends of the C-shaped segment 22 and the arc-shaped segment 31, an inter-piece insertion joint 32 is provided. 32 regulates the C-shaped segment 22 and the arc-shaped segment 31 adjacent in the circumferential direction so as not to be displaced in the tunnel radial direction. That is, the inter-piece insertion joint 32 includes an inwardly inclined end surface portion 22a of the circumferential connection end portion of the C-shaped segment 22, an outwardly inclined end surface portion 31a of the circumferential connection end portion of the arc-shaped segment 31, and these inwardly facing portions. It has a sealing member 33 (for example, a rubber strip) mounted between the inclined end face portion 22a and the outward inclined end face portion 31a, and a rectangular regulating plate. The outwardly inclined end surface portion 31a engages with the inwardly inclined end surface portion 22a via the seal member 33,
The regulating plate 34 is welded to the inner surface of the circumferential connection end of the C-shaped segment 22 in a state where the regulating plate 34 is in contact with about one third of the circumferential width thereof, and the exposed portion of the regulating plate 34 (about 2 / 3) comes into contact with the inner surface of the arc-shaped segment 31.

As shown in FIGS. 3 and 6, an inter-ring insertion joint 35 is provided at an axial connection end of the C-shaped segment 22, and the inter-ring insertion joint 35 is connected to an axially adjacent C-shaped segment. Is regulated so as not to shift in the radial direction of the tunnel. That is, the inter-ring insertion joint 35 is formed by the inwardly inclined end face 2 of the axial connection end of the C-shaped segment 22.
2b, an outwardly inclined end surface 22c, a sealing member 36 (for example, a rubber strip) mounted between the inwardly inclined end surface 22b and the outwardly inclined end surface 22c, and a regulating plate 37. .

The inwardly inclined end face 22b is formed at the tunnel face side connection end of the axial connection end of the C-shaped segment 22, and the outwardly inclined end face 22c is formed at the axial connection end. The regulating plate 37 is formed at the connection end on the side opposite to the tunnel face (hereinafter referred to as the anti-face side).
The inner surface of the connection end on the tunnel face side of the axial connection end of the C-shaped segment 22 formed in the mold has approximately そ の of that
The parts are welded together with the parts in contact. The exposed half of the regulating plate 37 is connected to the C-shaped segment 22.
Abuts against the inner surface of the connection end on the side opposite to the cutting face.

As shown in FIG. 3, the inter-ring joint 35 of the arc-shaped segment 31 is provided at the axial connection end of the arc-shaped segment 31 similarly to that of the C-shaped segment 22. 35 regulates the arc-shaped segment 31 adjacent in the axial direction so as not to be displaced in the radial direction of the tunnel. That is, the inter-ring insertion joint 35 of the arc-shaped segment 31 includes the inwardly inclined end face 31b and the outwardly inclined end face 31c of the axial connection end of the arc-shaped segment 31.
A sealing member 36 mounted between the inwardly inclined end surface portion 31b and the outwardly inclined end surface portion 31c;
And 7.

The inwardly inclined end surface portion 31b is formed at the connection end portion on the tunnel face side of the axial connection end portions of the arc-shaped segment 31, and the outwardly inclined end surface portion 31c is formed at the axial connection end portion. The restriction plate 37 is formed at the connection end on the opposite side of the face, and the regulating plate 37 is formed in the same circular cross section as the arc-shaped segment 31, and the connection on the tunnel face-side of the axial connection end of the arc-shaped segment 31. It is welded to the inner surface of the end with about a half thereof in contact. The exposed half portion of the regulating plate 37 comes into contact with the inner surface of the connection end of the arc-shaped segment 31 on the side opposite to the face.

As shown in FIGS. 3 and 4, the arc-shaped segment 31 is formed in a trapezoidal shape in a plan view, and is formed so that the circumferential width is wide on the tunnel face side and narrow on the non-face side. When assembling the arc-shaped segment 31, the arc-shaped segment 31 is temporarily placed at a position shifted to the face side by a distance of about 2/3 to half of the ring length, and then the C-shaped segment 22 is assembled. The rear half of the arc-shaped segment 31 is located between the pair of inclined end faces 22a of the C-shaped segment 22. Next, the arc-shaped segment 31 is inserted between the pair of inclined end faces 22a of the C-shaped segment 22 from the face side by a distance of about 2/3 to half of the ring length by two sets of shield jacks 7.

The distance (the circumferential distance) between the pair of inclined end faces 22a of the reinforced C-shaped segment 22 is also formed such that the tunnel face side is large and the anti-face side is small. The C-shaped segment 22 and the arc-shaped segment 31 are provided with backing material injection holes 22d and 31d for injecting the backing material from the inside, in a penetrating state.

The operation of the shield machine 1 and the steel pipe segment 15 described above will be described. At the time of tunnel excavation, the cutter head 5 is rotated by a plurality of hydraulic motors 6a while the shield jacks 7 are extended while applying a reaction force to the reinforced steel pipe segments 15 by a plurality of shield jacks 7, and excavation is performed. I will do it. The excavated soil excavated by the cutter head 5 is introduced into the screw conveyor 9 from the inside of the chamber 13, transferred to the belt conveyor 10 from the discharge port 9 a, and carried out to the ground by the belt conveyor 10.

Segment 2 in parallel with tunnel excavation
2, 31 are carried. In this case, as shown in FIGS. 1 and 7 to 9, the C-shaped segment 22 and the arc-shaped segment 31
Is transported to the rear end of the segment transport device 23 by the segment transport cart 24, and the segment transport device 23
Transfer to Next, as shown in FIGS. 1 and 12, the arc-shaped segment 31 is transported by the segment transport device 23 to a position near the erector device 8.

The excavation is interrupted every time the tunnel is excavated for a predetermined distance (for one ring), and the steel pipe segment 15 is covered on the inner surface of the tunnel. In this case, first, the support cart 17 of the reaction force receiving stopper device 16 is connected to the screw conveyor 9 via the connecting member 19 and fixed to the excavator main body 2, and in this state, the pair of left and right stopper members 18a is covered. It is strongly pressed against the inner surface of the finished steel pipe segment 15 (see FIG. 10). Thus, the soil water pressure load acting on the cutter head 5 is supported by the reinforced steel pipe segment 15 from the screw conveyor 9 via the reaction force receiving stopper device 16. Thereafter, the rod portions of all the plurality of shield jacks 7 are retracted to secure a space for assembling the steel pipe segments 15 between the reinforced steel pipe segments 15 and these shield jacks 7.

Next, as shown in FIG. 1, FIG. 2, FIG. 11, and FIG.
To the erector device 8 and fixed to the segment holding portion 8b of the erector body 8a. In this state, the arc-shaped segment 31 is moved in the diameter reduction direction, is turned around a tunnel axis by a predetermined angle (180 degrees), and the ring length is about 2 degrees.
/ 3 to half of the distance to the face side. next,
As shown in FIG. 13, the arc-shaped segment 31 is moved in the radially enlarged direction and temporarily placed in the tunnel.

Next, as shown in FIG. 1, FIG. 2, FIG. 11, and FIG.
To the erector device 8, and a pair of regulating plates 34 provided at a pair of circumferential connection ends of the C-shaped segment 22 are fixed to the expansion device 21 of the erector body 8a.

Next, as shown in FIGS. 1, 2 and 15,
By expanding the C-shaped segment 22 from the free state to the expanded state by the expansion device 21 and moving the C-shaped segment 22 backward by a small distance, the rear end of the reinforced steel pipe segment 15 is inserted through the inter-ring insertion joint 35. Engage with the front end. At this time, in the inter-ring insertion joint 35, C
Outwardly inclined end face portion 22c on the side opposite to the face of the mold segment 22
Is reinforced steel pipe segment 1 via seal member 36
In addition to engaging with the inwardly inclined end face portion 22b on the face side of No. 5, the restriction plate 37 prevents the C-shaped segment 22 from shifting in the radial direction of the tunnel.

Next, as shown in FIGS. 1, 2, and 16,
The temporarily placed arc-shaped segment 31 is pushed backward by the shield jack 7 for a distance of about 2/3 to half of the ring length, and a pair of inwardly-facing C-shaped segments 22 are assembled. The steel pipe segment 15 for one ring is lining by being pushed into the inclined end face portion 22a. At this time, arc segment 3
A pair of left and right outwardly inclined end surfaces 31c and a pair of inwardly inclined end surfaces 22a of the C-shaped segment 22 are engaged with each other via a seal member 33. Can be prevented from being displaced and displaced in the radial direction of the tunnel.

Further, the outwardly inclined end face portion 31c on the side opposite to the face of the arc-shaped segment 31 is connected to the inwardly inclined end face portion 3 on the face side of the reinforced steel pipe segment 15 via the seal member 36.
1b, and the restriction plate 37 can prevent the arc-shaped segment 31 from being displaced in the tunnel radial direction. Moreover, since the arc-shaped segment 31 is formed in the trapezoidal shape as described above, the arc-shaped segment 31
Even if is slightly displaced in the circumferential direction, it can be easily inserted while eliminating the dislocation.

According to the steel pipe segment 15 described above, the radius of curvature of the C-shaped segment 22 in the free state is set smaller than the radius of curvature of the steel pipe segment 15 attached to the inner surface of the tunnel. It can be transported in a free state without holding in a reduced diameter state.
It is not necessary to provide holding means for reducing the diameter of the transfer equipment such as the above. Therefore, the transfer equipment can be simplified and the equipment cost can be kept low.

C-shaped segment 22 and arc-shaped segment 31
Since the inter-piece insertion joint 32 is provided at the connection end in the circumferential direction, the C-shaped segment 22 and the arc-shaped segment 31 can always be assembled into one ring shape having the same circumference. An inter-ring insertion joint 35 is provided at the axial connection end of the C-shaped segment 22. The inter-ring insertion joint 35 includes an inwardly inclined end face 22b on the face side, an outwardly inclined end face 22c on the opposite face side, and a sealing member 36. And the regulating plate 37, the C-shaped segment 22 can be smoothly and easily assembled to the steel pipe segment 15 adjacent in the axial direction so as not to be stepped.

With the C-shaped segment 22 elastically deformed, the inwardly inclined end face portion 22a of the C-shaped segment 22 engages with the outwardly inclined end face portion 31a of the arc-shaped segment 31, and the regulating plate 34 It is possible to restrict the segment 31 from coming inward and to engage the inwardly inclined end face 22a and the outwardly inclined end face 31a so as not to be stepped.

When lining the C-shaped segment 22 or the arc-shaped segment 31 on the reinforced steel pipe segment 15, the inwardly inclined end face portion 22 b or 3 on the tunnel face side is used.
1b is engaged with the outwardly inclined end face portion 22c or 31c on the side opposite to the cutting face, and the C-shaped segment 2 is
2 or the arc-shaped segment 31 can be prevented from being displaced in the tunnel radial direction.

The inter-piece insertion joint 32 includes an inwardly inclined end face portion 22 a of the C-shaped segment 22 and an arc-shaped segment 3.
Since the seal member 33 is mounted between the outer inclined end surface portion 31a and the outer surface, the seal member 33 enhances the water stoppage, and between the ground and the piece, that is, between the C-shaped segment 22 and the arc-shaped segment 31. Water can be prevented from flowing through the gap.

The inter-ring insertion joint 35 is provided on the inwardly inclined end face portion 22 of the C-shaped segment 22 or the arc-shaped segment 31.
b or 31b and the outwardly inclined end face 22c or 31c
Since the seal member 36 is interposed between the rings, the seal member 36 further increases the water stoppage and prevents water from flowing from the ground through the gap between the rings, that is, between the steel pipe segments 15 adjacent in the tunnel axial direction. be able to.

Since the arc-shaped segment 31 is formed in a substantially trapezoidal shape in which the circumferential width of the arc-shaped segment 31 is large on the tunnel face side and narrow on the side opposite to the tunnel face side, even if the arc-shaped segment 31 is slightly displaced in the circumferential direction, the shield is formed. By simply pushing the jack 7, it is possible to easily insert the connector while eliminating the positional deviation.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) After assembling the C-shaped segment 22 and the arc-shaped segment 31 in a ring shape, it is also possible to push and assemble the reinforced steel pipe segment 15 with the shield jack 7 to assemble.

2) The inter-piece insertion joint has an inwardly sloping end face of the circumferential connection end of the C-shaped segment 22 and an outwardly sloping end face of the arc-shaped segment 31 engaged with the inwardly sloping end face. A joint having a regulating plate fixed to the outer surface of the circumferential connection end of the arc-shaped segment 31 and regulating the C-shaped segment 22 from the outside may be used. Further, the outwardly inclined end face of the circumferential connection end of the C-shaped segment 22, the inwardly inclined end face of the arc-shaped segment 31 engaged with the outwardly inclined end face, and the circumferential connection of the arc-shaped segment 31. It may be a joint having a regulating plate fixed to the inner surface of the end portion and regulating the C-shaped segment from the inside.

Incidentally, in the inter-piece insertion joint in which the regulating plate is fixed to the arc-shaped segment, it is also possible to assemble the C-shaped segment and the arc-shaped segment in this order. Further, the outwardly inclined end face of the circumferential connection end of the C-shaped segment 22 and the arc-shaped segment 3 engaged with the outwardly inclined end face
1 may be a joint having an inwardly inclined end face portion and a regulating plate fixed to the outer surface of the circumferential connection end portion of the C-shaped segment 22 and regulating the arc-shaped segment from the outside.

3) The ring-to-ring insertion joint is opposite to the inwardly inclined end face and the tunnel face formed at the tunnel face side connection end of the axial connection end of the C-shaped segment 22 or the arc-shaped segment 31. And an outwardly inclined end face formed at the connection end of the C-segment 22 or the arc-shaped segment 31 is fixed to and adjacent to the outer surface of the connection end of the C-shaped segment 22 or the arc-shaped segment 31 opposite to the tunnel face. A joint having a regulating plate for regulating the segment from outside may be used.

Also, of the axially connecting ends of the C-shaped segment 22 or the arc-shaped segment 31, the outwardly inclined end face formed on the connecting end on the tunnel face side and the connecting end on the opposite side to the tunnel face. An inwardly inclined end face formed,
The joint may be a joint having a regulating plate fixed to the outer surface of the connection end on the tunnel face side of the axial connection end of the C-shaped segment 22 or the arc-shaped segment 31 to regulate an adjacent segment from the outside. .

Furthermore, of the axially connected ends of the C-shaped segment 22 or the arc-shaped segment 31, the outwardly inclined end face formed at the connection end on the tunnel face side and the connection end opposite to the tunnel face are formed. An inwardly inclined end face formed,
A joint plate having a regulating plate fixed to an inner surface of a connection end portion of the C-shaped segment 22 or the arc-shaped segment 31 which is opposite to the tunnel face in an axial connection end portion, for regulating an adjacent segment from the inside; Is also good. In any case, the segments adjacent to each other in the axial direction can be smoothly connected by such an inter-ring insertion joint.

4) A carry-in vehicle may be provided between the segment conveying device 23 and the erector device 8 as needed to assist in the transfer of the C-shaped segment 22 and the arc-shaped segment 31. The present invention can be applied to a shield machine other than that shown in FIG. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0052]

According to the first aspect of the present invention, the radius of curvature of the C-shaped segment in the free state is set smaller than the radius of curvature of the steel pipe segment attached to the inner surface of the tunnel. It is possible to carry the sheet in a free state without holding it in a state, and it is not necessary to provide a holding means for reducing the diameter of the segment carrying apparatus. Therefore, the transfer equipment can be simplified and the equipment cost can be kept low.

Since a piece-to-piece insertion joint is provided at the circumferential connection ends of the C-shaped segment and the arc-shaped segment,
The mold segment and the arc segment can be assembled into one ring. Because the ring-to-ring insertion joint is provided at the axial connection end of the C-shaped segment, the C-shaped segment can be smoothly and easily assembled to the axially adjacent reinforced steel pipe segment so as not to be stepped. Can be. In addition, since the ring-shaped insertion joint is also provided at the axial connection end of the arc-shaped segment, it is possible to easily assemble the arc-shaped segment with the lining steel pipe segment that is adjacent in the axial direction so that it does not become uneven. it can. Therefore,
The stopping time of the shield machine required for assembling the steel pipe segments can be reduced.

Further, in a state where the C-shaped segment is elastically deformed, the inwardly inclined end face of the C-shaped segment is engaged with the outwardly inclined end face of the arc-shaped segment, and the arc-shaped segment is directed inward by the regulating plate. And the inwardly inclined end face and the outwardly inclined end face can be engaged in a single ring .

Further, when lining the C-shaped segment and the arc-shaped segment on the reinforced segment, the outwardly inclined end face on the side opposite to the tunnel face is engaged with the inwardly inclined end face on the side of the tunnel face. In this case, the C-shaped segment or the arc-shaped segment can be prevented from being displaced in the tunnel radial direction by the regulating plate .

According to the second aspect of the present invention, since the seal member is mounted between the inwardly inclined end surface portion and the outwardly inclined end surface portion of the bayonet joint, the seal member enhances the water stoppage and allows the piece to be removed from the ground. Prevents water from flowing through the gap between the C-segments and the arc-shaped segments, and prevents water from flowing from the ground through the gap between the rings, that is, between the steel pipe segments adjacent in the tunnel axial direction. be able to. The other effects are the same as those of the first aspect .

According to the third aspect of the present invention, the arc-shaped segment is formed in a substantially trapezoidal shape in which the circumferential width of the arc-shaped segment is wide on the tunnel face side and narrow on the side opposite to the tunnel face, so that the arc-shaped segment is slightly positioned in the circumferential direction. Even if it is misaligned, it can be easily inserted by simply pushing with the shield jack while eliminating this misalignment. The other effects are the same as those of the first or second 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 an enlarged sectional view of a main part showing a positional relationship between an erector device, a shield jack, a steel pipe segment and the like.

FIG. 3 is an exploded perspective view of a steel pipe segment.

FIG. 4 is a vertical sectional front view showing a state where the steel pipe segments are assembled in a ring shape.

FIG. 5 is an enlarged sectional view of the inter-piece insertion joint of FIG. 4;

FIG. 6 is an enlarged sectional view of the inter-ring insertion joint.

FIG. 7 is a rear view (a cross-sectional view taken along line VII-VII of FIG. 1) of the segment carrier and the steel pipe segment;

FIG. 8 is a rear view showing a state where the C-shaped segment is transported by the segment transport device (a cross-sectional view taken along line VIII-VIII in FIG. 1).
It is.

9 is a rear view (a cross-sectional view taken along line IX-IX in FIG. 1) illustrating a state in which the arc-shaped segment is transported by the segment transport device.

10 is a front view (an end view taken along line X-X in FIG. 1) of a reaction force receiving stopper device and a steel pipe segment and the like.

11 is a rear view (a sectional view taken along line XI-XI in FIG. 1) of the erector device and the steel pipe segment and the like.

FIG. 12 is a rear view showing a state where arc segments are supplied to the erector device.

FIG. 13 is a rear view showing a state where the arc-shaped segments are temporarily placed.

FIG. 14 is a rear view showing a state where the C-shaped segment is supplied to the erector device.

FIG. 15 is an explanatory diagram showing a state in which the C-shaped segment is changed from a free state to an expanded state.

FIG. 16 is an explanatory diagram illustrating an assembled state of a C-shaped segment and an arc-shaped segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 15 Steel pipe segment 22 C-shaped segment 22a, 22b, 31b Inwardly inclined end face part 22c, 31a, 31c Outwardly inclined end face part 31 Arc type segment 32 Piece insertion joint 33 Seal member 34 Regulator plate 35 Insertion between rings Joint 36 Sealing member 37 Regulation plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasunori Kondo 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Naoo Manabe 1-1-1, Higashikawasakicho, Chuo-ku, Kobe No. 3 Kawasaki Heavy Industries, Ltd., Kobe Main Office (72) Inventor Mitsuo Shimizu 1-3-1, Higashi Kawasaki-cho, Chuo-ku, Kobe City Kawasaki Heavy Industries, Ltd. Kobe Main Office (72) Inventor, Yoshio Sakai 1, Higashi-Kawasaki-cho, Chuo-ku, Kobe No. 1-3 Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Shunichi Masuda 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Inventor Tadashi Teramoto 2-2-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo No. 3 Kawasaki Steel Corporation (72) Inventor Hiroyuki Imashio 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. In-house (72) Inventor Hiroyuki Kawaguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Ryunosuke Kashima 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation ( 56) References JP-A-10-149095 (JP, A) JP-A-4-269298 (JP, A) JP-A-11-141294 (JP, A) JP-A-8-291699 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) E21D 11/14

Claims (3)

(57) [Claims] 1. A steel pipe segment for lining the inside of a tunnel excavated by a shield machine, wherein a steel pipe segment for one ring is formed by dividing the ring into two in the circumferential direction and a C-shaped segment having a C-shaped cross section. An arc-shaped segment having an arc shape, wherein the radius of curvature of the C-shaped segment in a free state before being assembled on the inner surface of the tunnel is set smaller than the radius of curvature of the steel pipe segment assembled on the inner surface of the tunnel; At the circumferential connection end of the C-shaped segment and the arc-shaped segment, there is provided a piece-to-piece insertion joint that regulates the adjacent segments so as not to be displaced in the radial direction of the tunnel. The axial connection end of the segment and the axial connection end of the arc-shaped segment connected to each other adjacent to each other in the tunnel axial direction,
An inter-ring insertion joint is provided to regulate adjacent segments so as not to be displaced in the tunnel radial direction, and the inter- piece insertion joint is provided in the circumferential direction of the C-shaped segment.
The inwardly inclined end face of the connecting end and the inwardly inclined end face
Outward slope of the circumferential connection end of the mating arc segment
Fixed to the end face and the inner surface of the circumferential connection end of the C-shaped segment.
A regulation plate that is attached and regulates the arc-shaped segment from the inside
The inter-ring plug joint is a C-shaped segment or an arc-shaped segment.
Contact on the tunnel face side of the axial connection end of the
Inwardly inclined end face and tunnel face formed at continuation end
An outwardly inclined end face formed at the opposite connection end,
Of axial connection end of C-shaped segment or arc-shaped segment
It is fixed to the inner surface of the connection end on the tunnel face side
A steel pipe segment comprising a regulating plate for regulating a contact segment from the inside . 2. The steel pipe segment according to claim 1 , wherein a seal member is mounted between the inwardly inclined end face and the outwardly inclined end face of the bayonet joint. Wherein said arc-shaped segment also claim 1, characterized in that its circumferential width is formed substantially in a trapezoidal shape is narrow side opposite to the tunnel face side is wide and tunnel face side
3. The steel pipe segment according to 2 .