JPH10306697A - Execution method of tunnel support and widening device of ring-shaped support member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the surface of a tunnel from sliding or collapsing into the tunnel by supporting the tunnel wall face immediately after excavation by a tunnel excavation machine. SOLUTION: After ring-shaped support members 3 have been assembled in the skinplate 15 of a tunnel excavation machine 1, the ring-shaped support members 3 are relatively transferred into the rear end part of the skinplate 15 in accordance with the excavation of the tunnel excavation machine 1 and the next ring-shaped support member 3 is assembled at the forward side of the support member 3 and further, a lining member 4 is installed between the support members 3, 3 to connect them. The rear side ring-shaped support member 3 relatively transferred to the tunnel wall face 2 side in accordance with the excavation of the tunnel excavation machine 1, is widened by a widening jack 5b to closely contact the tunnel wall face 2 and closing members are put between the separated ends of the support members 3 separated by the widening movement to integrally connect them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a support for a primary support on a wall surface excavated by a tunnel excavator.

[0002]

2. Description of the Related Art When a tunnel is excavated by a tunnel excavator, the excavated tunnel wall surface may fall off or fall down. Along with assembling the shoring along, a lining member such as expanded metal or wire mesh is stretched between the adjacent shoring in front and back, and this lining member prevents the ground on the wall surface of the tunnel from collapsing in the tunnel. ing.

[0003]

However, since the assembling work is performed behind a tunnel excavator in which the excavated tunnel wall surface is exposed, there is a possibility that the excavated wall surface may collapse during the assembling work. There is a problem that it is extremely dangerous and the work cannot be performed smoothly. For this reason, it has been proposed to assemble the support in the skin plate of the tunnel excavator and then move the support relative to the tunnel wall side according to the excavation of the tunnel excavator. Since the diameter is smaller than the wall surface, a gap is formed between the shoring and the tunnel wall surface when the shoring is sent out to the tunnel wall side. Therefore, in order to fill the gap, the shoring is formed to have a large diameter. Although it is necessary to correct it, at present there is no concrete means for implementing this.

[0004] The present invention has been made in view of such problems, and an object of the present invention is to provide a ring-shaped support member assembled in a skin plate of a tunnel excavator in accordance with the excavation of the tunnel excavator. When relatively moved to, the ring-shaped support member is easily and accurately aligned with the tunnel wall surface, and a lining member is erected between ring-shaped support members adjacent in the tunnel length direction, It is an object of the present invention to provide a method of forming a tunnel shoring which can easily perform a connecting operation.

[0005]

According to a first aspect of the present invention, there is provided a method for forming a tunnel support, comprising: a tunnel excavator having a skin plate for supporting at least an upper peripheral portion of a tunnel wall; A plurality of ring-shaped support members are sequentially assembled at regular intervals in the front-rear direction according to the excavation of the tunnel excavator in the skin plate, and a lining member is erected between at least upper portions of the ring-shaped support members facing front and rear. And the step of expanding the diameter of the ring-shaped support member relatively moved from the skin plate to the rear side of the tunnel wall surface along with the excavation of the tunnel excavator toward the tunnel wall surface. .

According to a second aspect of the present invention, in the first aspect of the present invention, the ring-shaped support member assembled in the skin plate of the tunnel excavator is moved to the rear end side of the skin plate according to the excavation of the tunnel excavator. And the diameter is increased within the skin plate.

A third aspect of the present invention is a means for expanding the diameter of a ring-shaped support member, wherein the ring-shaped support member is formed by connecting a plurality of support materials curved in an arc shape in a ring shape. A portion of the support material is released, the free ends are connected by a jack, and the ring-shaped support member is expanded toward the tunnel wall by extending the jack, and then a closing member is provided between the free ends. Are interposed and connected.

According to a fourth aspect of the present invention, there is provided another means for expanding the diameter of the ring-shaped support member, wherein a plurality of support materials curved in an arc shape are connected in a ring shape and a part of the support member is supported. A ring-shaped support is provided by contacting a plurality of diameter-enlarging jacks arranged in a tunnel with the inner peripheral surface of a ring-shaped support member having a gap between the working materials and extending these diameter-expanding jacks. After the working member is expanded in diameter toward the tunnel wall surface, a closing member is interposed and connected between the free ends.

A fifth aspect of the present invention is an apparatus for expanding the diameter of a ring-shaped support member for supporting the tunnel wall surface, wherein the skin plate of the tunnel excavator includes a skin plate for supporting at least an upper peripheral portion of the tunnel wall surface. A beam body extending rearward from the body, a sliding frame mounted to be movable back and forth over the entire length of the beam body, and the sliding frame radially disposed on the sliding frame and the sliding frame being outside the skin plate. And a plurality of jacks for expanding the diameter of the ring-shaped support member when the ring-shaped support member is located.

[0010]

According to the first aspect of the present invention, the ring-shaped support member previously assembled in the skin plate of the tunnel excavator is relatively moved to the rear end of the skin plate according to the excavation of the tunnel excavator. Thereafter, the next ring-shaped support member is assembled at a predetermined interval in front of the ring-shaped support member, and a lining member is erected and connected between these front and rear ring-shaped support members. Since the assembling of the front and rear ring-shaped support members and the erection work of the lining members are performed in the skin plate of the tunnel excavator, it is safe and safe without being affected by the falling or falling of the ground on the tunnel wall. It is possible to efficiently assemble the ring-shaped support member and install the lining member. The lining member may be provided only on the upper peripheral side of the tunnel wall surface where the ground falls or collapses.

Further, since the diameter of the ring-shaped support member on the rear side is increased when the ring-shaped support member is relatively sent to the tunnel wall surface in accordance with the excavation of the tunnel excavator, the ring-shaped support member can be easily and surely adhered to the tunnel wall surface. The lining member erected between these front and rear ring-shaped support members is moved so that it can be continuously sent out from the rear end of the skin plate of the tunnel excavator, and the lining member from the excavated tunnel wall immediately after the tunnel excavator can be moved. Even if the ground falls or collapses on the ground, it can be prevented from falling into the tunnel, and safe work inside the tunnel can be secured.

As described above, the ring-shaped support members are disposed at predetermined intervals before and after in the skin plate of the tunnel excavator, and the lining member is provided at least between the upper portions between the ring-shaped support members. By repeatedly performing the step of erection and the step of making the tunnel excavator excavate and closely contacting the tunnel wall surface by expanding the diameter of the rear ring-shaped support member moving relatively from the skin plate to the tunnel wall side, Tunnel support can be constructed efficiently.

[0013] In the above method of forming a tunnel support,
According to the invention of claim 2, the front ring-shaped support member assembled in the skin plate of the tunnel excavator is relatively moved to the rear end side of the skin plate according to the excavation of the tunnel excavator, and the inside of the skin plate is moved. The ring-shaped support member can be easily and quickly brought into close contact with the tunnel wall surface by minimizing the size of the diameter increase from the rear end of the skin plate to the close contact with the tunnel wall surface.

According to the third aspect of the present invention, since the ring-shaped support member is formed by connecting a plurality of support materials curved in an arc shape, the tunnel wall surface excavated by the tunnel excavator. An accurate ring-shaped support member can be assembled using a support having a radius of curvature corresponding to the diameter of the support, and a portion of the ring-shaped support member is released, and a jack is released between the free ends. Since the ring-shaped support member is expanded by connecting and extending the jack, the expanding force of the jack is uniformly applied to all the support members constituting the ring-shaped support member. The diameter can be easily and accurately expanded.
Further, after the expanded ring-shaped support member is brought into close contact with the tunnel wall surface, the closing member is interposed and connected between the free ends. Therefore, a ring adapted to support the tunnel wall surface by adjusting the length of the closing member. The support member can be easily and accurately formed. Further, the workability in which the jack can be easily attached to and detached from the free end of the ring-shaped support member is improved.

According to a fourth aspect of the present invention, a ring-shaped support member formed by connecting a plurality of support materials curved in an arc shape in a ring shape and leaving some of the support materials apart is expanded by a jack. Although the diameter is the same as that of the third aspect of the invention, the present invention relates to a method in which a plurality of diameter-enlarging jacks arranged in a tunnel are brought into contact with the inner peripheral surface of the ring-shaped support member. Since the diameter of the ring-shaped support member is expanded by extending these jacks for diameter expansion,
The ring-shaped support member can be more easily and accurately expanded in diameter than the invention according to claim 3, in which the gap between the free ends is pushed and expanded by the jack, and a jack is provided between the free ends. Since it is not performed, the intervention of the closing member and the connecting operation can be performed smoothly.

According to a fifth aspect of the present invention, there is provided an apparatus for expanding the diameter of a ring-shaped support member for supporting a wall surface of a tunnel, which is provided so as to protrude rearward from a skin plate of a tunnel excavator. Since several ring-shaped support member diameter expansion jacks are slidably attached to the beam body that is being moved back and forth, these jacks are assembled in a skin plate with a ring-shaped support member. By expanding the ring-shaped support member by pressing it against the peripheral surface, the diameter of the ring-shaped support member can be easily and accurately expanded. In addition, by performing this expanding operation in synchronization with the excavation of the tunnel excavator, the ring-shaped support member can be pressed against the tunnel wall surface while relatively moving from the rear end of the skin plate toward the tunnel wall side. Construction work can be performed efficiently.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tunnel excavator according to a first embodiment of the present invention;
The tunnel wall 2 excavated by the ring-shaped support members 3, 3,... 3, and the adjacent ring-shaped support members 3,
3 shows a state where the ring-shaped support member 3 is sequentially assembled in the tunnel excavator 1 and then supported by the lining member 4 erected and connected between the tunnel excavator 1. As the digging advances, it moves relative to the tunnel excavator 1 toward the tunnel wall surface 2, is expanded by the diameter expanding device 5, and is sequentially pressed against the tunnel wall surface 2.

A lining member 4 is erected and connected between the ring-shaped support members 3 adjacent to each other at a certain interval in the tunnel excavator 1 as shown in FIG. The ring-shaped support members 3 are connected to each other by connecting members 6 arranged at desired intervals in the circumferential direction, and are relatively sent from the tunnel excavator 1 to the tunnel wall 2 side in that state. The shoring will be formed.

The tunnel excavator 1 has a tunnel wall 2
An excavator main body 11 formed to have a diameter smaller than the diameter of the excavator and rotatably supporting a cutter plate 12 for excavating a tunnel at the front, and a tunnel length integral with the main body 11 and extending from the center of the rear surface of the main body 11. A beam 13 extending in a horizontal direction in the vertical direction, and a skin plate supported on the upper surface of the front end portion of the beam 13 via a link and a jack 14 to suppress the upper peripheral portion of the tunnel wall 2. A front support 16 projecting downward from the lower surface of the main body 11 and extending and contracting by a jack 16a; and a rear support 17 projecting downward from the lower surface of the rear end of the beam 13 and extending vertically by a jack 17a. When,
The rear gripper 18 slidably mounted along the lower surface of the beam body 13 and a propulsion jack 19 connecting the main body 11 and the rear gripper 18. It is slidably arranged.

The skin plate 15 is formed in an arc shape in cross section along the circumferentially curved surface of the upper peripheral surface of the tunnel wall 2, and its length is shorter than that of the beam body 13. The skin plate 15 is formed to have a peripheral length that supports at least the upper peripheral portion of the tunnel wall surface. The rear grippers 18 are provided on the rear side of the beam body 13 projecting rearward from the skin plate 15, and are provided on both lower surfaces of a beam receiver 20 slidable relative to the beam body 13 as is well known. And is connected to the beam receiver 20 so as to be vertically movable by a jack (not shown). The rear jacks 19 are connected between the rear grippers 18 and both sides of the rear surface of the main body 11 by the propulsion jacks 19, 19, respectively. Further, the ring-shaped support member expanding device 5 expands the ring-shaped support member 3 on the upper surface and both side surfaces of the sliding frame 5a slidably fitted on the beam body 13 in front of the rear gripper 18. The diameter jack 5b is radially attached.

As described above, the ring-shaped support member expanding device 5
A method of forming a support on a tunnel wall 2 excavated while excavating a tunnel by a tunnel excavator 1 having the following will be specifically described. First, in the space below the skin plate 15 of the tunnel excavator 1, the ring-shaped support member 3 having a smaller diameter than the skin plate 15 is assembled around the beam body 13 and around the beam body 13. As shown in FIGS. 2 and 3, the ring-shaped support member 3 is a support member 3a made of an I-shaped steel or an H-shaped steel having a predetermined length curved in an arc shape along the curved surface in the circumferential direction of the tunnel wall surface 2. Are joined to the opposite end faces thereof by joining pieces 3b, 3b to each other with bolts and nuts 3c.
By assembling into a ring shape, a part of the material is assembled into a shape in which it is released, and a supporting material 3a 'having a predetermined length is interposed between the free ends 3d and 3d without being connected. I have.

The ring-shaped support member 3 is provided at a predetermined distance from the ring-shaped support member 3 which has been assembled and disposed in the rear end of the skin plate 15. The lining member 4 having a constant width and length, which is made of a wire mesh or expanded metal, is curved between the front and rear ring-shaped supporting members 3 and 3 in an arc shape along the circumferential direction of the skin plate 15. And both ends in the tunnel length direction of the lining member 4 are fixed to the opposing surfaces of the ring-shaped support members 3, 3. And a connecting member 6 having a fixed length at desired intervals. The lining member 4 may be provided over the entire circumference between the ring-shaped support members 3, 3.
In order to suppress the falling or falling of the ground from the ground, it is sufficient to provide at least only the upper peripheral portion between the ring-shaped support members 3.

Lining member 4 for ring-shaped support member 3
As shown in FIG. 5, the end of the lining member 4 is fixed to the end of the lining member 4 by contacting the end of the lining member 4 with the inner surface of the upper flange portion of the lining member 3a. May be fixed by fitting the pinching member 7 between the upper surfaces of the lower flange portions,
Also, as shown in FIG. 6, the end of the lining member 4 is
The bolt 7a may be fixed by screwing the bolt 7a to the upper flange portion by contacting the inner surface of the upper flange portion 3a. In any of the fixing means, a positioning protrusion 4a is protruded from an upper surface of an end portion of the lining member 4, and the positioning protrusion 4a is brought into contact with an end surface of an upper flange portion of the support material 3a. It can be accurately installed between the front and rear ring-shaped support members 3,3.

Further, the connecting member 6 holds the front and rear ring-shaped support members 3, 3 at a constant interval. The connecting member 6 is made of a rod-like material such as a reinforcing bar, and has a lengthwise direction. By bending both ends, the bent portions 6a, 6a are used as support materials 3a.
Is fixed in the hole of the mounting member 8 fixed to the hole.

In these front and rear ring-shaped support members 3, the rear ring-shaped support member 3 disposed in the rear end of the skin plate 15 is used for expanding the upper and both sides of the diameter expanding device 5. The inner peripheral surface is pressed by the extension of the jack 5b, so that the diameter of the jack 5b is made larger than that of the front ring-shaped support member 3 so as to be close to the inner peripheral surface of the skin plate 15.

In this state, when the tunnel excavator 1 is excavated to excavate the tunnel, the front and rear ring-shaped support members 3 and 3 have their lower peripheral portions received by the lower peripheral surface of the tunnel wall surface 2. Together with the existing ring-shaped support member 3 already installed in the tunnel wall 2 via the connecting member 6, so that the tunnel excavator 1 may fall down at that position despite the excavation. And is relatively moved toward the tunnel wall 2 according to the excavation of the tunnel excavator 1.

At this time, three diameter expanding jacks 5b are pressed against the inner peripheral surface of the rear ring-shaped support member 3 located inside the rear end of the skin plate 15 of the tunnel excavator 1. Since the diameter expanding device 5 has its sliding frame 5a slidably mounted on the beam 13 of the tunnel excavator 1, the tunnel excavator 1 excavates the tunnel wall 2 from within the rear end of the skin plate 15. It moves relative to the rear side integrally with the rear ring-shaped support member 3. When this rear ring-shaped support member 3 is taken out to the tunnel wall 2 side by the excavation of the tunnel excavator 1, the diameter of the tunnel wall 2 is gradually increased by extending each jack 5b of the diameter expanding device 5. The outer peripheral surface is brought into close contact.

The free ends 3d, 3d of the rear ring-shaped support member 3, which has been expanded by the diameter expanding device 5 and closely adhered to the tunnel wall 2, are connected between these free ends 3d, 3d. Since the support material 3a 'is interposed in the circumferential direction from both end surfaces of the support material 3a', the support material 3a '
An arcuate closing member 9 made of the same material as 3a is interposed, and the joining pieces 3b fixed to both ends of the closing member 9 are joined to the joining pieces 3b fixed to the end faces of the opposing support materials 3a and 3a '. In the joined state, the enlarged diameter ring-shaped support member 3 is fixed and connected by bolts and nuts 3c to support the tunnel wall 2 over the entire circumference.

After forming the expanded ring-shaped support member 3,
Diameter expanding device 5 into front ring-shaped support member 3 located in the rear end of skin plate 15 of tunnel excavator 1
Is advanced along the beam body 13, the jack 5 b of the diameter expanding device 5 is extended, and the ring-shaped support member 3 is gradually expanded in diameter according to the excavation of the tunnel excavator 1. When it reaches the skin plate
Make the state close to the inner peripheral surface of No. 15.

On the other hand, the ring-shaped support member 3 is moved into the rear end portion of the skin plate 15 by the excavation of the tunnel excavator 1, and the next ring-shaped support member is placed in a space in the skin plate 15. 3 is assembled in the same manner as described above, and this ring-shaped support member 3 is attached to the front ring-shaped support member 3, and the ring-shaped support member 3 located in the rear end of the skin plate 15 is attached to the rear ring-shaped support member. As the working member 3, the lining member 4 and the connecting member 6 are connected between the ring-shaped supporting members 3, 3 in the same manner as described above.

Then, the ring-shaped support member 3 in the rear end portion of the skin plate 15 is again brought out to the tunnel wall surface 2 side according to the excavation of the tunnel excavator 1 and expanded by the diameter expanding device 5 so as to be formed on the tunnel wall surface 2. A step of bringing into contact,
Moving the diameter expanding device 5 to the side of the ring-shaped support member 3 in the skin plate 15 to gradually expand the diameter of the ring-shaped support member 3 as the tunnel excavator 1 excavates; Next, the next ring-shaped support member 3 is assembled in the skin plate 15 in front of 3 and connected to the lining member 4 between the ring-shaped support member 3 and the ring-shaped support member 3 at the rear end of the skin plate 15. The step of connecting the material 6 is repeated to form a support on the tunnel wall 2.

In the excavation by the tunnel excavator 1, after the rear gripper 18 is pressed against both side surfaces of the tunnel wall 2, the rear support 17 is contracted and separated from the bottom of the tunnel wall 2, and then the propulsion jack 19 is extended. Then, the main body 11 is moved forward by supporting the reaction force on the tunnel wall 2 via the rear gripper 18. As shown in FIG. 7, the ring-shaped support member 3 supporting the tunnel wall surface 2 is firmly fixed by driving a lock bolt 21 into the tunnel wall surface 2 from a lower peripheral portion thereof.

In the above embodiment, the beam body of the tunnel excavator 1 is used as the diameter expanding device 5 of the ring-shaped support member 3.
A sliding frame 5a is provided on the sliding frame 13 and jacks 5b for expanding the diameter are mounted on the upper surface and both side surfaces of the sliding frame 5a, and the inner peripheral surface of the ring-shaped support member 3 is pressed by these jacks 5b. The tunnel excavator 1 and the beam body 13 are formed separately from each other in addition to the diameter expanding device 5,
The beam body 13 may be disposed so as to be movable in the tunnel length direction with respect to the tunnel excavator 1 and extend from the inside of the skin plate 15 to the rear side of the skin plate 15. Without using such a beam member 13, the free ends 3d, 3d of the ring-shaped support member 3 as shown in FIG.
The diameter expanding jack 5A may be connected between the inner surfaces thereof, and the diameter may be expanded by separating the free ends 3d, 3d by extension of the diameter expanding jack 5A.

That is, the brackets 10, 10 are removably fixed to the inner surfaces of the support members 3a, 3a, which are separated from each other, of the ring-shaped support member 3, and a jack 5A for expanding the diameter is provided between these brackets 10, 10. Concatenate. The attachment of the jack for diameter expansion 5A to the ring-shaped support member 3 is performed by the front and rear ring-shaped support members 3, 3 in the skin plate 15 of the tunnel excavator 1.
May be performed only on the ring-shaped support member 3 located in the rear end of the skin plate 15.

Then, similarly to the above-described embodiment, the ring-shaped support member 3 in the rear end portion of the skin plate 15 is expanded to a diameter close to the inner circumferential surface of the skin plate 15 by extending the jack 5A for expanding the diameter. After the diameter is increased, the tunnel excavator 1 is relatively moved toward the tunnel wall 2 in accordance with the excavation, and the diameter-enlarging jack 5A is extended again to further expand the ring-shaped support member 3, thereby making the ring-shaped support member 3 more closely contact the tunnel wall 2. As shown in FIG. 9, an arc-shaped closed member made of the same material as the support material 3a is provided between the free ends 3d, 3d of the support materials 3a, 3a separated by the extension of the diameter-enlarging jack 5A. The joining piece 3b fixed to both ends of the closing member 9 with the member 9 interposed is attached to the end faces of the opposing support materials 3a, 3a.
The enlarged diameter ring-shaped support member 3 which is fixed and connected with bolts and nuts 3c in a state of being joined to 3b to support the tunnel wall 2 over the entire circumference is formed.

The point at which the lining member 4 is erected between the front and rear ring-shaped support members 3 and the point at which the lining member 4 is connected by the connecting member 6 is the same as in the above-described embodiment. A step of expanding the diameter of the ring-shaped support member 3 relatively moved to the side of the tunnel wall 2 and bringing the ring-shaped support member 3 in the skin plate 15 into contact with the tunnel wall 2, and expanding the diameter of the ring-shaped support member 3 in the skin plate 15 according to the excavation of the tunnel excavator 1. A step of gradually expanding the diameter by using the jack 5A for relative movement into the rear end portion of the skin plate 15, and assembling the ring-shaped support member 3 in the skin plate 15 in front of the ring-shaped support member 3 to form the ring. The step of connecting the lining member 4 and the connecting member 6 between the ring-shaped support member 3 and the ring-shaped support member 3 in the rear end of the skin plate 15 is repeated to form a support on the tunnel wall surface 2. Ku is intended.

In any of the above embodiments,
The facing surfaces of the free ends 3d, 3d of the ring-shaped support member 3 are closely contacted directly or via another support material 3a ', but assembled with the free ends 3d, 3d separated from each other. Alternatively, as shown in FIG. 10, the free ends 3d may be assembled such that the free ends 3d overlap inside and outside. By assembling in this manner, the circumferential length of the ring-shaped support member 3 is increased, and when the diameter of the ring-shaped support member 3 is increased, the closing member 9 is closed.
Can also be used in close contact with the tunnel wall 2 without using any of the above.

[Brief description of the drawings]

FIG. 1 is a simplified longitudinal side view of a state where a shoring is formed using a tunnel excavator equipped with a diameter expanding device,

FIG. 2 is an enlarged vertical cross-sectional side view showing a support assembly state at a rear portion of a skin plate of the tunnel excavator;

FIG. 3 is a vertical sectional front view of the inside of a skin plate in which a ring-shaped support member is assembled.

FIG. 4 is a longitudinal sectional front view showing a state in which a ring-shaped support member is brought into close contact with a tunnel wall surface by a diameter expanding device;

FIG. 5 is an enlarged longitudinal sectional side view showing a structure in which an end portion of a lining member is fixed to a support material.

FIG. 6 is an enlarged vertical sectional side view showing another fixing structure;

FIG. 7 is a longitudinal sectional front view showing a state in which a ring-shaped support member is fixed to a tunnel wall surface with a lock bolt.

FIG. 8 is a longitudinal sectional front view showing a state where the free ends of the ring-shaped support member are connected by another diameter expanding means;

FIG. 9 is a longitudinal sectional front view showing a state in which a ring-shaped support member is brought into close contact with a tunnel wall surface by the diameter expanding means;

FIG. 10 is a simplified front view showing another embodiment of the ring-shaped support member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Tunnel wall 3 Ring support material 3a Support material 3d Free end 4 Lining member 5 Diameter expanding device 9 Closing member 15 Skin plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junji Ono 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Inside Okumura Gumi Co., Ltd. (72) Inventor Kazuo Nishikawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura Gumi Co., Ltd.

Claims (5)

[Claims] 1. A tunnel excavator having a skin plate supporting at least an upper peripheral portion of a wall surface of a tunnel, wherein a plurality of ring-shaped support members are arranged at regular intervals in the front-rear direction in the skin plate according to the excavation of the tunnel excavator. A step of assembling sequentially and erecting a lining member at least between upper portions between the ring-shaped support members facing each other in front and rear, and a ring-shaped support relatively moved from a skin plate to a rear wall surface side of the tunnel with the excavation of the tunnel excavator; A step of expanding the diameter of the engineering member toward the wall surface of the tunnel. 2. The method according to claim 1, wherein the ring-shaped support member assembled in the skin plate of the tunnel excavator is relatively moved to the rear end side of the skin plate according to the excavation of the tunnel excavator and expanded in the skin plate. The method for forming a tunnel support according to claim 1, wherein: 3. The ring-shaped support member is formed by connecting a plurality of support materials curved in an arc shape in a ring shape and releasing a part of the support materials by a jack. The tunnel according to claim 1, wherein the ring-shaped support member is expanded toward the tunnel wall surface by connecting and extending the jack, and then a closing member is interposed and connected between the free ends. The method of forming the shoring. 4. The ring-shaped support member is formed by connecting a plurality of support materials curved in an arc shape in a ring shape and separating some of the support materials. The ring-shaped support member was expanded toward the wall of the tunnel by contacting a plurality of jacks for diameter expansion arranged in the tunnel on the inner peripheral surface of the member and extending the jacks for diameter expansion. 2. The method according to claim 1, further comprising interposing and connecting a closing member between the free ends. 5. An apparatus for expanding the diameter of a ring-shaped support member for supporting a tunnel wall surface, wherein the tunnel excavator includes a skin plate for supporting at least an upper peripheral portion of the tunnel wall surface. An extended beam body, a sliding frame mounted movably back and forth over the entire length of the beam body, and the sliding frame radially disposed on the sliding frame and the sliding frame was positioned outside the skin plate. A ring expanding device for a ring-shaped support member, comprising a plurality of jacks for expanding the diameter of the ring-shaped support member.