JPH0781517B2 - Reaction force support member - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction force receiving and supporting member for a tunnel excavating machine, and more particularly to a reaction force receiving and supporting member used in a tunnel boring machine method (hereinafter referred to as TBM method).

[0002]

2. Description of the Related Art The TBM method has been known as an example of a tunnel excavation method. This is different from the conventional construction method in that the entire tunnel cross section is cut or crushed by a tunnel excavating machine having a rotary cutter without using explosives. When advancing such a tunnel excavating machine, the gripper is normally pushed out alternately from the front and rear bodies of the machine in the radial direction, and the jack between the front and rear fuselage is tunneled while taking reaction force to the ground on the inner circumference of the tunnel. It expands and contracts in the axial direction and moves forward by the so-called scale insect method. Therefore, the TBM method has been adopted as an advantageous method for excavating a horizontal tunnel in rock.

On the other hand, due to the spread of the TBM method in recent years, it is necessary to cope with not only stable hard rock but also changes in the stratum such as crush zones and soft ground, and the TBM method is also adopted for steep tunnels. Therefore, the method using the gripper may not be able to obtain a sufficient excavation reaction force. Then, in order to cope with such a situation, a method is employed in which a segment used in a conventional shield construction method or the like is assembled on the rear side of a machine, and this is used as a propulsion reaction force receiving material to move forward by the thrust of a jack.

[0004]

However, the above-mentioned segment has a structure not only for preventing the ground from collapsing but also for supporting the earth pressure and water pressure of the surrounding ground. In addition to being strongly manufactured by using such as, etc., many metals such as reinforcing bars, joint fittings, bolts and gripping tools are used in order to firmly assemble them. Therefore, it is uneconomical to use such a segment as a reaction force receiving material in the TBM method adopted in a relatively stable ground because a reaction force receiving material having an unnecessarily strong structure is used. .

In the TBM method, in view of its economical efficiency, the tunnel boring machine should be used many times.
A method of digging a pilot tunnel of the same diameter and then expanding it to a shape according to the purpose is adopted, and as a result, when constructing the pilot tunnel, it is necessary to remove the reaction force receiving material when expanding the tunnel, therefore If the segment having a strong structure is used as a reaction force receiving material, there is a problem that it takes time to remove the segment.

Therefore, the present invention has been made in view of the above problems, and has a simple and economical structure suitable for mounting on the inner peripheral surface of a tunnel excavated by the TBM method, and a tunnel excavating machine. (EN) A reaction force receiving and supporting member that can sufficiently support excavation reaction force and that can be easily removed by a tunnel excavation machine.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned object, and is continuously mounted in a ring shape on the inner peripheral surface of excavation of a tunnel by the TBM method and the ground collapses from the inner peripheral surface. And a support rod that is integrally attached to the ring-shaped lining member at a predetermined position in the circumferential direction and that is continuously provided in the tunnel axial direction to support the excavation reaction force of the tunnel excavating machine. A reaction force receiving and supporting member, the lining member and the front
The gist of the reaction force receiving and supporting member is characterized in that the supporting rod is composed of a non-reinforced concrete member and can be shredded and removed by a tunnel excavating machine.

In the reaction force receiving and supporting member of the present invention, it is preferable that the lining member is made of fiber reinforced concrete.

Further, the reaction force receiving and supporting member of the present invention is as described above.
The support rod may be integrally formed with the lining member to form an arc-shaped unit body, and the unit bodies may be continuously connected and integrated in the circumferential direction to be assembled into a ring shape.

[0010] In addition, the reaction force received支保member of the present invention, before
The support rod may be formed separately from the lining member, and the support rod and the arc-shaped lining member may be assembled alternately in a circumferential direction so as to be assembled into a ring shape.

Another gist of the present invention is to use the TBM method.
It is attached to the inner surface of the tunnel excavation in a ring shape
A lining member that prevents the ground from collapsing from the peripheral surface, and
It is formed separately from the lining member of the
Can be removed at a predetermined position in the circumferential direction of the attached lining member
It is attached integrally with this and connected in the tunnel axial direction.
Installed to support the excavation reaction force of the tunnel excavator.
A support member for receiving a reaction force including
The tongue members are composed of non-reinforced concrete members,
Characterized by enabling crushing and removal by a flannel excavating machine
It is in the reaction force receiving support member.

[0012]

According to the reaction force receiving and supporting member of the first aspect of the present invention, the lining member covers the excavation inner peripheral surface of the tunnel to prevent the ground from collapsing from the inner peripheral surface. In addition, TB
Since the excavation inner peripheral surface of the tunnel by the M method is relatively stable and the earth pressure and water pressure applied to the lining member are small, the lining member can have a simple structure made of non-reinforced concrete. In addition, the support rod is also non-rebar
It is made of concrete and is installed in the axial direction of the tunnel.
While supporting the excavation reaction force by contacting the jack etc. of the tunnel excavation machine, the excavation reaction force to be supported by being integrated with the lining member is the frictional force between the lining member and the excavation inner peripheral surface via the lining member. It is transmitted to the outer ground and is burdened. Such a lining member and a support
Since the pad is made of non-reinforced concrete,
Easy by tunnel excavating machine when expanding flannel
Can be crushed and removed.

A reaction force receiving support portion according to claim 5 of the present invention.
The material has the same structure as the reaction force receiving and supporting member according to claim 1.
The lining member and the lining member are separate
Can be removed at a predetermined position in the circumferential direction of the lining member.
Noh with a support rod attached integrally with this
By arranging in the same manner as above, the same effect can be obtained. Was
However, at this time, the lining material is made of non-reinforced concrete
The support rod is a tunnel
Removable separately before crushing and removing with a drilling machine
Since it is installed, it is not necessarily reinforced concrete.
No more molding required.

[0014]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 (a) and 1 (b), the reaction force receiving / supporting member 10 according to claim 5 of the present invention is mounted in a ring shape on the inner peripheral surface of the pilot tunnel excavated by the tunnel boring machine. The lining member 11 that prevents the ground from collapsing from the inner circumferential surface of the tunnel by covering it.
And the support rods 12 radially provided on the inner peripheral surface of the lining member 11 at eight locations.

The lining member 11 is made of non-reinforced concrete such as GRC (glass fiber reinforced concrete), CFRC (carbon fiber reinforced concrete) and VFR.
Eight arc pieces 1 made of fiber reinforced concrete such as C (vinyl fiber reinforced concrete)
3 are integrated in a ring shape through the semicircular fitting concave and convex portions 18 provided on these peripheral edges, and the ring-shaped integrated lining members 11 are continuously provided in the tunnel axial direction to form the inner circumference of the tunnel. Line the surface for a certain length. Then, each arc-shaped piece 13 has a side edge in the tunnel axis direction that is obliquely inclined to facilitate assembly in the circumferential direction, and the last arc-shaped piece 13 is inserted along the inclined side to form a ring shape. The lining member 11 can be expanded in the circumferential direction and brought into close contact with the inner peripheral surface of the excavation. Also,
Since each arc-shaped piece 13 is a thin non-reinforced concrete, its outer peripheral surface is covered with a reinforcing net of glass, carbon fiber, vinylon or the like so as not to be damaged during transportation or assembly.

On the other hand, the support rod 12 has, for example, 200 to
It is a columnar body formed of non-reinforced concrete that can withstand a compressive stress of 300 kg / cm ² , and is fixedly integrated with the lining member 11 by a fixing bolt 14. And
The support rod 12 has a circular fitting concave and convex portion 15 at the front and rear ends thereof.
These are fitted together and are continuously provided in the tunnel axial direction to support the excavation reaction force from the jack of the tunnel excavation machine.
In addition, 16 is a rail 17 for moving a carriage for carry-out.
Is a sleeper for laying. In addition, the support rod 1
Since No. 2 can be easily removed from the lining member 11, it is not always necessary to form the non-reinforced concrete.

The reaction force receiving and supporting member 10 having the above structure can be easily removed by the tunnel excavating machine when the tunnel is widened after the completion of excavation of the pilot tunnel. That is, in order to remove these, first, the support rod 12 is collected together with the rail 17, the sleeper 16, and the like. Since the lining member 11 is made of unreinforced fiber-reinforced concrete, it is crushed and removed together with the surrounding ground along with the widening excavation of the tunnel without removing it.

FIGS. 2A and 2B show the claims of the present invention.
It is an example of the reaction force receiving and supporting member described in 1 to 3 . Then, the reaction force receiving and supporting member 20 of this embodiment
Is a rod portion 21 made of high-strength non-reinforced concrete
And a thin wing part 2 made of fiber reinforced concrete
The arc-shaped unit piece 23 integrally formed with 2 is integrated into a ring shape through a semi-circular fitting concave / convex portion 27 provided on the side of the tunnel axial direction. Further, the rod portion 21 is provided with circular fitting concave and convex portions 26 on its front and rear end faces, and these are fitted to each other so that the rod portion 21 is accurately connected in the tunnel axial direction, and the excavation reaction force of the tunnel excavating machine is efficiently provided. To support.
Since the wing portions 22 do not receive the thrust of the jack, it is preferable that a slight margin be provided between the wing portions 22 adjacent in the tunnel axial direction. Then, the unit piece 23 is, as shown in FIGS.
It is covered with a fiber reinforced net 28 of glass, carbon fiber, vinylon or the like to supplement the strength during assembly and transportation, and a gripping notch 24 is provided on the inner peripheral surface of the rod portion 21 to facilitate assembly by an erector. . Further, as shown in FIG. 4, if the unit piece 23 'to be finally assembled is composed of three members with the key block 25 sandwiched in the center, by inserting the key block 25, a ring-shaped reaction force receiving member is received. It is possible to enlarge the supporting member 20 as a whole and bring it into close contact with the inner peripheral surface of the tunnel. In this case, it is preferable that the fitting concave and convex portions 26 provided on the rod portion 21 be limited to two places so as not to hinder the expansion.

Further, according to the reaction force receiving / supporting member 20 having such a structure, the rod portion 21 which should support the excavation reaction force.
Since it can be easily crushed and removed by the tunnel excavating machine together with the wing portion 22, the widening work by the tunnel excavating machine can be performed more easily.

Here, in order to manufacture the unit piece 23,
After separately setting the rod portion 21 made of high-strength concrete in the mold for producing the wing portion 22, fiber-reinforced concrete is placed. A fiber-reinforced net 28 is wound around the rod portion 21 in advance, and the end of the net is inserted into the wing portion 22. Further, it is preferable to use a six-sided closed mold because the mold to be used requires a lot of time and labor to trowel the uneven surface. And, the method of placing the fiber reinforced concrete is the unit piece 2
Vertical casting is performed so that the axial direction of 3 is the vertical direction of the formwork, and in order to give the axial end surface of the unit piece 23 flexibility, the portion near the final finish surface is cast with concrete mixed with a foamable material. It is preferable.

5 (a) and 5 (b) show the claims of the present invention.
12 shows still another embodiment of the reaction force receiving and supporting member described in 4 . Then, the reaction force receiving and supporting member 30 of this embodiment
Is a rod piece 3 made of high strength non-reinforced concrete
1 and a thin wing piece 32 made of fiber reinforced concrete are manufactured as separate bodies, and these are formed into a fitting concavo-convex portion 3
The ring-shaped lining members are continuously connected in the circumferential direction of the tunnel in an alternating manner for a predetermined length in the tunnel axial direction.

With the reaction force receiving and supporting member 30 having such a structure, the rod piece 31 and the wing piece 32 can be easily manufactured, and these can be easily crushed and removed by the tunnel excavating machine. Therefore, the widening work of the tunnel can be easily performed.

[0024]

As described above, the reaction force receiving and supporting member of the present invention prevents the ground from collapsing on the inner peripheral surface of the excavation of the tunnel.
A lining member made of a non-reinforced concrete member, and a support rod that is integrally attached to the lining member and supports the excavation reaction force of the tunnel excavating machine, and the support rod is formed as a separate body from the lining member, La
Removably attached to inning member or iron free
Formed by reinforced concrete members. Therefore, TB
Despite having a simple and economical structure suitable for mounting on the inner peripheral surface of tunnel excavation by the M method ,
The inner surface of the tunnel excavation is covered and the ground collapses from this inner surface.
It is possible to prevent falling and to sufficiently support the excavation reaction force of the tunnel excavating machine , so that the tunnel excavating machine can easily crush and remove it to easily perform the widening work of the tunnel. Therefore, the present invention has a particular effect of enabling the tunnel construction by the TBM method to be economically and easily performed.

[Brief description of drawings]

FIG. 1 shows an embodiment of a reaction force receiving and supporting member of the present invention, in which (a) is a front view and (b) is a side view.

2A and 2B show another embodiment of the reaction force receiving and supporting member of the present invention, in which FIG. 2A is a front view and FIG. 2B is a side view.

3A and 3B are perspective views showing a unit piece constituting the reaction force receiving and supporting member of FIG.

FIG. 4 is a perspective view showing an example of a unit piece to be finally assembled in the reaction force receiving and supporting member of FIG.

5A and 5B show another embodiment of the reaction force receiving and supporting member of the present invention, in which (A) is a front view and (B) is a side view.

[Explanation of symbols]

 10, 20, 30 Reaction force receiving / holding member 11 Lining member 12 Support rod 21 Rod part 22 Wing part (lining member) 23 Unit piece 31 Rod piece 32 Wing piece (lining member)

Claims (4)

[Claims] 1. A lining member which is mounted on an inner circumferential surface of a tunnel for excavation and prevents the ground from collapsing from the inner circumferential surface, and a lining member which is integrally attached to a predetermined position in the circumferential direction of the lining member and which is in the tunnel axial direction A reaction force receiving and supporting member comprising a support rod that is continuously provided to support the excavation reaction force of the tunnel excavating machine, the lining member and the supporting member.
A reaction force receiving and supporting member characterized in that the holding rod is composed of a non-reinforced concrete member and can be shredded and removed by a tunnel excavating machine. 2. The reaction force receiving and supporting member according to claim 1, wherein the lining member is made of fiber reinforced concrete. 3. The reaction force receiving and supporting member according to claim 1 or 2, wherein a unit body in which the support rod is integrally formed with the lining member is continuously connected and integrated in the circumferential direction. 4. The counter rod according to claim 1, wherein the support rod is formed as a separate body from the lining member, and the support rod and the lining member are alternately arranged in the circumferential direction and integrated. Force receiving support member. 5. An inner surface of a tunnel excavated by being mounted on an inner peripheral surface of the tunnel.
A lining member that prevents the ground from collapsing from the peripheral surface, and
Formed as a separate body from the lining member of
Detachable at a predetermined position in the circumferential direction of the member and attached integrally with it
Tunnel excavation along with the tunnel
Reaction force consisting of a support rod that supports the excavation reaction force of a cutting machine
As a support member, the lining member is
The tunnel excavating machine
Support unit for receiving reaction force characterized by being able to crush and remove
Material.