JPH0718320B2 - Method and device for receiving propulsion jack reaction force of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" In a non-segment shield construction method for constructing a tunnel while lining an excavated mine without using a segment, a method of receiving a jack reaction force of a shield machine, and Regarding the device.

“Prior Art” Previously, the applicant provided a non-segment shield method (Japanese Patent Application No. 60-295378).

This method is to excavate a hole in the ground by excavating using a shield machine, along the wall surface of the hole formed in the rear part of the shield machine, and an inner formwork having a predetermined width divided into a plurality of Assembling the outer formwork with the connecting member into a cylindrical shape,
Next, after a predetermined number of the inner and outer molds are continuously provided along the hole excavation direction, concrete is placed between the inner mold and the outer mold to perform concrete lining, and the concrete is When the solidified part of the lining reaches a specified length, the inner formwork of the construction method among the inner formwork connected inside the concrete lining is separated from the outer formwork, dismantled, and then newly excavated. It is used as an inner formwork to be assembled on the wall surface, and the tunnel is built in the ground by repeating the above steps in sequence.

Therefore, in this method, the concrete lining is applied by the primary lining to complete the tunnel, and the concrete lining is responsible for long-term loads such as earth pressure and short-term loads such as jack thrust, so it is buried in concrete. The outer formwork is cheap and eliminates the need for expensive segments as lining material.
The concrete lining as the secondary lining is not required, and the construction period can be shortened and the construction cost can be greatly reduced.

[Problems to be Solved by the Invention] However, in the non-segment shield construction method, the adhesion between the concrete lining that solidifies the jack reaction force of the shield machine and the inner mold and the spikes attached to the inner mold Since it depends on the shear resistance of concrete and concrete, it is necessary to have a large number of inner formwork to be left in the part of the solidified concrete lining. In addition, the distance to the end of the inner formwork becomes long, and when the inner formwork is diverted to the wall surface of the newly excavated pile, the equipment for transporting it to the tail part of the shield machine becomes large, and In consideration of demolding the formwork, when a release agent is used for the inner formwork, the specified adhesive force does not occur between the mold and the concrete. There was a problem that the jack reaction force could not be obtained.

The present invention has been made in view of the above problems, and reduces the number of inner molds installed in the solidified concrete section to receive the jack reaction force of the shield machine, and reliably reduces the jack reaction force. An object of the present invention is to provide a method and an apparatus for receiving a jack reaction force of a shield machine, which can receive a jack reaction force and can use a small-sized fixed jack for receiving the jack reaction force.

[Means for Solving Problems] In order to achieve the above object, the method of receiving the propulsion jack reaction force of the shield machine according to the first invention is a solidified concrete lining portion at a rear position separated from the shield machine. From the inside of the inner formwork of
By pressing the inner formwork against the concrete lining with the fixed jack, a frictional force is generated between the concrete lining and the inner formwork.

A device for receiving a propulsion jack reaction force of a shield machine, which is a second invention, is arranged at a rear position separated from a shield machine for excavating a pit in the ground, and presses an inner formwork of a wall of a mine that has been lined. And a frame for holding the fixed jack along the wall surface of the mine, and a drive mechanism for moving the frame along the driving direction of the mine. .

[Examples] Hereinafter, the present invention will be described with reference to the drawings. 1 to 4 show one embodiment of the present invention, and FIG. 1 is a diagram for explaining the outline of the non-segment shield construction method of the present invention. First, the components in FIG. 1 will be described. Reference numeral E is the ground in the vicinity where a tunnel is constructed, 1 is a shield machine for excavating the ground E, 2 is a jack for propulsion, and 3 and 4 are assembled in an annular shape. Inner formwork (hereinafter abbreviated as “inner formwork”) and outer formwork (hereinafter, abbreviated as “outer frame”), 5 is a connecting portion of inner frames 3, 3 that are continuously provided in the tunnel excavation direction 2 is a girder frame fixed for each concrete placing section, 6 is a concrete placing machine, 7 is an erector for assembling the formwork, and 8 is an erector for dismantling the formwork. Reference numeral a is a concrete placing section, b is an unconsolidated concrete section, c is a consolidated concrete section, d is a formwork dismantling section, R is a concrete lining, and G is a backfill grout.

Next, FIGS. 2 and 3 show a method and apparatus for receiving the jack reaction force of the shield machine 1 which is actually used in the non-segment shield construction method.
The figure shows the drive mechanism of the device. In these drawings, reference numeral S is a device that receives a jack reaction force, and is a fixed jack 10, 10, ... For pressing the inside of the inner frame 3.
And a frame body 11 for supporting the fixed jacks 10, 10, ...
And a drive mechanism 12 for moving the frame body 11 are the main constituent elements.

The fixed jacks 10, 10, ... Are arranged annularly along the inner formwork 3, 3, ..
By extending the jacks 10, 10, ...
It is designed to press the inside of 3,3, .... The frame body 11 includes an annular frame portion 11a, 11a for supporting the jacks 10, 10, ..., and a connecting material 11b, 11b, ... For fixing the frame portions 11a, 11a to each other in the tunnel excavation direction. .Connecting members 11b, 11b that are composed of and connect the lower portions of the frame portions 11a, 11a
A drive mechanism 12 is installed in the lower part of the. Drive mechanism 12
As shown in FIG. 4, the wheels 14 fixed to the lower portions of the connecting members 11b, 11b through the mounting members 13 and the inner formwork 3, 3 ,. It consists of a rail 15 fixed to the inside. The drive mechanism 12 may be provided with a drive device (not shown) that drives the wheels 14.

Next, a method of receiving the jack reaction force of the shield machine of the present invention in the non-segment shield construction method will be described.

(I) First, the inner frame 3 and the outer frame 4 are integrated by a connecting member (not shown) so that the inner frame 3 and the outer frame 4 form a predetermined space inside thereof and overlap each other. At that time, the inner frame 3
When an axial force of a certain value or more is applied in the excavation direction, the inner frame 3 can be moved relative to the outer frame 4.

(Ii) Next, the integrated inner frame 3 and outer frame 4 are assembled in an annular shape at the rear part of the shield machine 1 using the erector 7 (hereinafter, one annularly assembled formwork is referred to as an “annular body”). Abbreviated). As for the order of assembling the molds, first, the molds 3 and 4 are installed on the bottom, both sides, and further on the tunnel cross section, and finally on the top (see FIG. 3). In addition, the assembled annular body has the inner frame 3 adjacent thereto.
Fasten the joint plate (not shown) with bolts and nuts to fix them together.

(Iii) Next, a reaction force is applied to the inner frame 3 of the annular body to drive the jack 2, so that the shield machine 1 is propelled a certain distance.

(Iv) By repeating the steps (i) to (iii), several annular bodies (four in this embodiment) are continuously provided in the tunnel excavation direction. The continuous annular bodies fix the inner frames 3 adjacent to each other.

(V) Next, by attaching the end frame 5 to the inner frame 3 of the finally assembled annular body, a cylindrical hermetically sealed space portion in which concrete can be placed between the inner frame 3 and the outer frame 4. To form.

Here, the concrete pouring section a is completed. In this concrete placing section a, with respect to the soil water pressure received from the ground E, the load is applied from the outer frame 4 to the inner frame 3 via a connecting member or the like.
It is transmitted to and is taken over by this inner frame 3.

(Vi) Next, the above steps (i) to (iii) are repeated to further install one annular body in front of the concrete placing section a (on the left side with respect to the paper surface), and then to perform concrete placing. Between the inner frame 3 and the outer frame 4 of the installation section a, concrete is placed by the concrete placing machine 6 and the concrete lining R is applied. The concrete is filled into the mold through an injection hole (not shown) of the inner frame 3.

Therefore, the outer frame 4 is permanently buried in the concrete as a lining material, and the gable frame 5 is also buried. The T-shaped water stop plate 5a fixed to the end frame 5 enhances the water stop effect and also transmits the load on the concrete joint surface.

(Vii) Further, the excavated hole is lined by sequentially repeating the steps (i) to (vi). In this way, as the lining is sequentially performed, an unconsolidated concrete section b in which the concrete is not hardened is further provided behind the concrete placing section a (on the right side with respect to the paper surface). The solidified concrete section c in which the concrete is completely hardened is successively completed. Backfill grout is injected into the solidified concrete section c between the outer frame 4 and the wall surface of the excavated hole. The back-filling grout is performed from the injection hole of the inner frame 3 that communicates with the back-filling grout injection holes (not shown) provided at every other positions in the excavation direction.

In the solidified concrete section c, due to the strength development of the concrete lining R, the concrete lining R bears long-term loads received from the ground E, and the adhesion force acting between the concrete lining R and the inner frame 3 and the shear resistance due to spikes. The force is responsible for the short-term jack thrust that acts when the shield machine 1 is propelled. However,
In the unconsolidated concrete section b, since the concrete is not completely hardened, the adhesion force does not act between the inner frame 3 and the concrete lining R against the jack thrust. Further, the inner frame 3 is capable of moving relative to the outer frame 4 when an axial force such as a jack thrust or a certain value or more is applied. Therefore, in the unconsolidated concrete section b, the inner frame 3 does not support the jack thrust, but only transmits the force to the inner frame 3 of the rear consolidated concrete section c.

(Viii) Next, a device (hereinafter simply referred to as "device") S for receiving the jack reaction force of the shield machine 1 at a predetermined location of the solidified concrete section c completed as described above.
Set up. In order to install the device S, the device S is moved by driving the drive mechanism 12 inside the predetermined inner frame 3, 3 (in the present embodiment, the frontmost part of the consolidated concrete section), and then fixed. By extending the jacks 10, 10, ... in the radial direction and pressing the inside of the inner frame 3, the inner frames 3, 3, ..
・ ・ Press strongly against the concrete lining R.

As a result, the inner frame 3,3, ... and the concrete lining R
A frictional force is generated between them and the total resistance force (the total of the adhesion force, the shearing resistance force and the frictional force) that receives the jack reaction force increases.

Then, it is confirmed that the solidified concrete section c has a length that supports the jack reaction force of the shield machine 1 by the total resistance force generated between the inner frames 3, 3, ... And the concrete lining R. After that, the inner frame 3 of the formwork dismantling section d behind the solidified concrete section c is sequentially disassembled from the rearmost part by performing the assembling order shown in the step (ii) in the reverse order using the erector 8. Go. The disassembled inner frame 3 is diverted in the rear part of the shield machine 1 as an inner frame of an annular body to be newly assembled. Further, the device S is also moved as the solidified concrete section c moves in the tunnel excavation direction.

If the total resistance force between the concrete lining R and the inner frames 3, 3, ... Is not sufficient to support the jack reaction force of the shield machine 1 only by the device S, the device S
The number may be increased to 2, 3, ...

Therefore, in the non-segment shield construction method, the concrete lining R
Since the concrete lining R is used for long-term load such as earth pressure and short-term load such as jack thrust, the outer frame 4 embedded in the concrete becomes cheap and the lining is completed. The expensive segment as a material is unnecessary, and the concrete lining as a secondary lining is also unnecessary.

Further, in the present invention, the device S provided in the consolidated concrete section c increases the total resistance force generated between the inner frames 3, 3, ... And the concrete lining R. , The solidified concrete section c can be shortened, the number of the inner formwork 3 installed in the solidified concrete section c can be reduced, and it can be installed from the tail part of the shield machine 1 to the formwork dismantling section d. The distance to the last part of the inner formwork is shortened, and when the inner formwork is diverted to the wall of the newly excavated mine, the equipment for carrying to the tail part of the shield machine 1 can be reduced, and the inner formwork can be reduced. In consideration of demolding the frame 3, it is possible to generate a predetermined total resistance force between the inner frame 3 and the concrete even when a releasing agent is used, and to obtain a predetermined jack reaction force. I can.

The concrete lining R may be made of reinforced concrete by arranging reinforcing bars inside the concrete lining R to increase the yield strength.

[Advantage of the Invention] As described in detail above, according to the method of receiving the reaction force of the propulsion jack of the shield machine shown in the first aspect of the invention, the inside of the inner formwork of the solidified concrete lining portion is fixed to the concrete by the fixed jack. Since the frictional force due to the pressing force was generated between the concrete lining and the inner mold by pressing toward the lining, sufficient frictional force generated between these concrete lining and the inner mold was By this, it is possible to receive the reaction force of the propulsion jack of the shield machine through the inner formwork, thereby shortening the remaining section of the inner formwork left in the solidified concrete section as compared with the conventional one, and It is possible to reduce the number of inner molds used in the solidified concrete section.

According to the device for receiving the reaction force of the propulsion jack of the shield machine shown in the second aspect of the invention, the fixed jack provided on the frame body is extended to direct the inner side of the inner mold of the solidified concrete lining portion toward the concrete lining. By pressing by pressing, it is possible to generate a frictional force due to the pressing force between the concrete lining and the inner mold, and due to the sufficient frictional force generated between the concrete lining and the inner mold, The propulsion jack reaction force of the shield machine can be taken over via the formwork, whereby the remaining section of the inner formwork left in the solidified concrete section can be shortened as compared with the conventional one, and the solidified concrete It is possible to reduce the number of inner molds used in the section.

Therefore, in the first and second aspects of the invention, the distance from the tail portion of the shield machine to the end of the inner formwork installed in the solidified concrete lining is shortened, and the inner formwork is newly drilled. When diverting to a wall surface, the equipment and labor for transporting to the tail part of the shield machine can be reduced, and even when a release agent is used for the inner mold, as described above, Due to the sufficient frictional force generated between the concrete lining and the concrete lining, a predetermined adhesive force can be generated between the inner formwork and the concrete lining, and the propulsion jack reaction force can be reliably received.

Further, in these first and second inventions, at the rear position separated from the shield machine, the inside of the inner formwork of the solidified concrete lining portion is pressed by the fixed jack toward the concrete lining. Due to the sufficient frictional force generated between the lining and the inner formwork, the reaction force of the propulsion jack of the shield machine can be received via the inner formwork, and the reaction force of the propulsion jack is not directly applied to the fixed jack. Therefore, the fixed jack is not subjected to an excessive force from the lateral direction (the length direction of the mine and the direction orthogonal to the axis of the rod of the fixed jack). As a result, the fixed jack has excellent handleability. A small one can be used, and the workability of tunnel construction can be improved.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional side view of a tunnel showing an outline of a non-segment shield construction method, and FIG. 2 is a non-sectional view of FIG. FIG. 4 is a side sectional view of a tunnel showing that the device of the present invention is used in the segment shield method, FIG. 3 is an enlarged vertical sectional view of the consolidated concrete section of FIG. 2, and FIG. It is a partially enlarged view showing a drive mechanism. E ... Ground, R ... Concrete lining, c ... Solidified concrete section, S ... Device (device that receives jack reaction force of shield machine), 1 ... Shield machine, 2 ... Jack, 3 ... Inside Frame (inner mold), 4 ... Outer frame (outer mold),
10 …… fixed jack, 11 …… frame, 12 …… drive mechanism.

Claims (2)

[Claims] Claim: What is claimed is: 1. A form made up of an inner form and an outer form is assembled into a cylinder along a wall surface of a pit formed at a rear portion of a shield machine, and then a space between the inner form and the outer form is formed. A method of receiving the reaction force of the jacking force of a shield machine in the non-segment shield method of constructing a tunnel while pouring concrete into the tunnel, in a rear position separated from the shield machine. From the inside of the formwork, by pressing the inner formwork against the concrete lining with a fixed jack, the propulsion jack reaction force of the shield machine, which is characterized by generating a frictional force between the concrete lining and the inner formwork. How to receive. 2. A retractable fixed jack which is disposed at a rear position separated from a shield machine for excavating a pit in the ground and presses an inner formwork of a wall of a mine lining, and this fixed jack. An apparatus for receiving a reaction force of a propulsion jack of a shield machine, comprising: a frame body that holds the wall along the wall surface of the mine; and a drive mechanism that moves the frame body in the propulsion direction of the mine.