JPS62276199A - Method and device for receiving jack reaction of shielding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention "Field of Industrial Application" In the non-segment shield construction method in which a tunnel is constructed while lining the wall surface of an excavated pit without using segments, shield This invention relates to a method and device for receiving the jerking reaction force of an aircraft.

"Prior Art" Previously, the applicant submitted a non-segment shield construction method.

In this construction method, a hole is excavated underground by using a shield machine, and an inner formwork with a predetermined width divided into multiple parts is formed along the wall of the hole formed at the rear of the shield machine. The outer formwork is assembled into a cylindrical shape by integrating it with connecting members,
Next, after a predetermined number of these inner and outer formworks are installed in series along the excavation direction of the hole, concrete is poured between the inner formwork and the outer formwork to provide a concrete lining, and this concrete When the solidified part of the lining reaches a predetermined length, the rear inner formwork installed continuously inside the concrete lining is separated from the outer formwork, dismantled, and then newly excavated. did.

The material is used as an inner formwork to be assembled on the wall of the tunnel, and the above steps are repeated sequentially to construct a tunnel underground.

Therefore, in this construction method, the tunnel is completed by applying concrete lining in the concrete lining, and since the concrete lining carries long-term loads such as earth water pressure and short-term loads such as jacking thrust, the tunnel is The outer formwork to be buried in the area is inexpensive and eliminates the need for expensive segments as lining material.
It also eliminates the need for a concrete lining as a secondary lining, making it possible to shorten the construction period and significantly reduce construction costs.

``Problem to be solved by the invention'' However, in the non-segment shield construction method, the jacking reaction force of the shield machine depends on the adhesion force between the solidified concrete lining and the inner formwork and the shear resistance force by the cone. Therefore, it is necessary to leave a large number of inner formworks on the hardened concrete lining. When the distance becomes longer and the inner formwork is used for the wall of a newly excavated pit, the equipment to transport it to the tail of the shield machine becomes large-scale, and the inner formwork needs to be demolded. Taking this into consideration, there are problems such as when a release agent is used on the inner formwork, the specified adhesion force may not be generated between it and the concrete, and the specified jacking reaction force may not be obtained. Ta.

The present invention has been made in view of the above-mentioned problems, and it is possible to directly receive the gloss reaction force without relying on the adhesion force generated between the concrete lining and the inner formwork and the shear resistance force due to the cone. In order to reduce the number of inner formworks installed in the consolidated concrete section, we have developed a method and equipment for receiving the gloss reaction force of a shield machine that can reliably receive the jack reaction force. purpose.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the method of the present invention converts the jacking reaction force transmitted through the inner formwork installed inside the concrete lining into It is characterized by propelling the shield machine while being directly supported by the cradle.

The apparatus of the present invention also includes a reaction force cradle that supports jacking reaction force via an inner formwork installed on the wall surface of the excavated pit in order to line eight walls of the excavated pit with concrete lining, and A reaction force truck supporting a reaction force pedestal on a hardened concrete lining, and a sliding fixing part (e) for fixing the reaction force pedestal to the reaction force truck, and the reaction force truck supports an inner wall surface of the concrete lining. A press jack that can be expanded and contracted toward the wall to press the spreader against the inner wall of the mine, a frame that holds the press jack, and a frame that holds the press in the direction of excavation of the mine. It is characterized by the fact that it uses a drive machine +14 to move it along.

“Example J Hereinafter, the present invention will be explained with reference to the drawings.

1 to 4 show one embodiment of the present invention, and are diagrams for explaining a method and apparatus for receiving a jacking reaction force of a shield machine in a non-segment shield construction method.

First, to explain the components in Fig. 1, symbol E is the ground near where the tunnel will be constructed, l is the shield machine that excavates the ground E, 2 is the propulsion jack, and 3.4 is assembled in a ring shape. The inner formwork (hereinafter abbreviated as "inner frame") and the outer formwork (hereinafter abbreviated as "outer frame"), 5 is the connecting part of the inner frame 3.3 which is installed in succession in the tunnel excavation direction. A gable frame is fixed for each concrete placement section, 6 is a concrete placing machine, 7 is an erector for assembling the formwork, and 8 is an erector for dismantling the formwork. In addition, code a is the concrete pouring section,
b indicates an unconsolidated concrete section, C indicates a consolidated concrete section, R indicates concrete lining, and G indicates backfill grout.

Next, using Figures 1 to 4, we will explain the device (hereinafter referred to as the "device") S that receives the jacking reaction force of the shield machine that is actually used in the non-segment shield method. do.

The device S includes inner frames 3, 3. . . . a reaction force pedestal 10 that supports the jacking reaction force of the shield [1], a reaction force truck 11 that supports this reaction force pedestal IO within the concrete lining R of the consolidated concrete section C, The main components include a fixing member 12 for fixing the reaction pedestal IO to the reaction truck 11, and the reaction truck 11 has spreaders 13, 13 pressed against the inner wall surface of the concrete lining R; In order to press this spreader 13゜13 against the inner wall surface of the concrete lining R, there is a pressing jack 14.14 which is extendable and retractable toward the wall surface.
．． ..., a frame body 15 that holds the pressing jacks 14, 14, ..., and a drive mechanism 16 that moves this frame body 15 along the tunnel excavation direction.

The reaction pedestal lO is an annular frame body formed with a surface that contacts the side surface of the inner frame 3 annularly installed along the wall surface of the pit with a predetermined width in the radial direction. is a fixing member 12 for fixing the reaction force pedestal lO to the corner of the frame 15.
is provided. The frame body 15 constitutes a frame by combining rod-shaped bodies into a rectangular parallelepiped, and press jacks +4.14. ... are arranged in two rows of 6 pieces each, and the pressure jacks are 14゜1.
4, . . . one spreader 13, 13 is fixed on each side of the frame 15. The spreader 13 has a crescent-shaped cross section, and a curved surface with a curvature that allows it to come into close contact with the inner circumferential surface of the concrete lining R is formed on its outer surface, and the above-mentioned six pressing jacks +4 .14. A rectangular plane is formed on which ... can be fixed.

As shown in FIG. 4, a drive mechanism 16 is attached to the bottom of the frame 15. It consists of a rail part 19 attached to the inner circumferential surface of the concrete lining R so that the rail part 17 can run. Note that the drive mechanism 16 may be provided with a drive device (U and Z shown in the figure) that drives the wheels 17.

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

(i) First, as shown in Figure 1, the inner frame 3 and the outer frame 4
The inner frame 3 and the outer frame 11 are integrated by the connecting member 20 so that the inner frame 3 and the outer frame 11 overlap with each other while forming a predetermined space inside thereof. At this time, when an axial force of a certain value or more (force acting in the direction of tunnel excavation) acts on the inner frame 3, the structure is such that the inner frame 3 can move relative to the outer frame 4.

(ii) Next, the integrated inner frame 3 and outer frame 4 are assembled in a ring shape at the rear of the shield machine 1 using the erector 7 (hereinafter, an example of the formwork assembled in a ring shape is referred to as "
(abbreviated as ``ring body''). The order of assembling the formwork is to first install the formwork 3.4 on the bottom, both sides, and then the top of the tunnel cross section, and finally on the top (second
(see figure). Further, the assembled annular body is fixed together by tightening the joint plates (not shown) of the adjacent inner frames 3 with bolts and nuts.

(iii) Next, the shield machine 1 is propelled a certain distance by driving the jack 2 by taking a reaction force in the inner frame 3 of the annular body (how to take the jack reaction force will be described later).

(I■) By repeating the steps (1) to (mountain) above, several annular bodies (four in this embodiment) are installed in a row 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 annular body assembled last, a cylindrical sealed space is created in which concrete can be poured between the inner frame 3 and the outer frame 4. form.

Concrete pouring section a is now completed. In this concrete pouring section a, the load is transmitted from the outer frame 4 to the inner frame 3 via the connecting members 20 etc. in response to the soil water pressure received from the ground E, and the inner frame 3 holds the bearing. It has become.

(vl) Next, steps (1) to (iii) above were repeated to install +=, - more annular bodies in front of the concrete placement section a (on the left side relative to the page). After that, concrete is placed between the inner frame 3 and the outer frame 4 in the concrete placement section a using a concrete placing machine 6 to form a concrete lining R. Concrete is filled into the formwork through injection holes (not shown) in the inner frame 3.

Therefore, the outer frame 4 is permanently buried in concrete as a lining material, and the end frame 5tJ is buried in stages. 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) Furthermore, by sequentially repeating the steps (i) to (vi) above, the excavated hole is lined. In this way, as the lining is carried out one after another, there is an unconsolidated concrete section behind the concrete placement section a (on the right side of the page) where the concrete has not yet been consolidated. Consolidated concrete section C, in which the concrete is completely hardened, is gradually completed. In the consolidated concrete section C, backfill grout G is injected between the outer frame 4 and the wall surface of the excavated hole. Backfill grouting G is performed through injection holes in the inner frame 3 that communicate with backfill grout injection holes (not shown) provided every other time in the excavation direction.

In this consolidated concrete section C, the concrete lining R receives various long-term loads from the ground E due to the strength of the concrete lining R.

Therefore, the inner frame 3.3 installed in this consolidated concrete section C. ... is no longer necessary, and it is also necessary to install a device S at a predetermined location in the completed consolidated concrete section C to receive the jacking reaction force of the shield machine 1.

(vii) To install the device S, move the reaction force truck 11 in the tunnel excavation direction by driving the drive mechanism 16, and move the front surface of the reaction force pedestal 10 fixed to the front part of the reaction force truck 11. It is brought into contact with the side surface of the inner frame 3 installed at the rearmost part of the concrete lining R. Then, with the reaction force pedestal lO in contact with the side surface of the inner frame 3, press jack 14. +4. . . , move the spreader 13 in the direction of arrow X as shown in FIG. 3, and bring it into pressure contact with the inner wall surface of the concrete lining R.

By doing so, a large frictional force is generated between the outer surface of the spreader 13 and the concrete lining R,
Uke will have the same lustrous thrust when propelling shield machine 1.

In the unconsolidated concrete section, since the concrete is not completely hardened, no adhesion force acts between the inner frame 3 and the concrete lining R against the jacking thrust. Further, the inner frame 3 can be moved relative to the outer frame 4 when an axial force of a certain value or more, such as a jacking thrust, is applied. Therefore, in this unconsolidated concrete section, the inner frame 3 does not support the jacking thrust, but only transmits the force to the rear inner frame 3.

(IX) Then, when the concrete lining R of the unconsolidated concrete section solidifies and changes to the consolidated concrete section C, as shown in FIG. By reversing the assembly order shown in 11), the inner frame 3.3.・
... will be dismantled. The disassembled inner frame 3 is used as the inner frame of a newly assembled annular body at the rear of the shield machine 1. Also, the consolidated concrete section C moves in the tunnel excavation direction, and the inner frame 3.3. ... is dismantled, and when the shield machine 1 is to be propelled by moving the device S, be sure to bring the reaction pedestal 10 into contact with the side of the inner frame 3, and also move the spreader 13, 13 is kept in pressure contact with the inner wall surface of the concrete lining R.

In addition, if the device S alone is not sufficient to support the jacking reaction force of the shield machine 1, the reaction force truck 1
1 may be increased by 2, 3, etc.

As mentioned above, in the non-segment shield construction method, the concrete lining R is applied in the next lining to complete the tunnel, and the concrete lining R is used to prevent long-term loads such as water supply and pressure and jack thrust. The outer frame 4, which is buried in concrete, is inexpensive and eliminates the need for expensive segments as a lining material, as well as concrete lining as a secondary lining material. is unnecessary.

Furthermore, in the present invention, the inner frame 3.3. Since it is designed to directly receive the jack thrust through...
There is almost no need to install the inner frame 3 in the consolidated concrete section C, and the distance from the tail of the shield machine I to the rearmost inner frame 3 installed in the consolidated concrete section C is shortened. When converting the frame 3 to the wall of a newly excavated pit, the equipment for transporting it to the tail of the shield machine l can be reduced, and in consideration of demolding the inner frame 3, the inner frame 3 When a release agent is used, there is no need to rely on the adhesive force with many uncertain factors that occurs between the concrete lining R and the concrete lining R as in the past, and it is possible to reliably obtain a predetermined jacking reaction force.

Note that the concrete lining R may optionally be made of reinforced concrete by arranging reinforcing bars therein to increase its strength.

"Effects of the Invention" As explained above, the present invention reduces the jacking reaction force transmitted through the inner formwork installed inside the concrete lining in the non-segment shield construction method.
Since the shielding machine is propelled by receiving the reaction force directly from the reaction pedestal, there is no need to install an inner formwork in the consolidated concrete section, and the consolidation is carried out from the tail of the shielding machine. The distance to the inner formwork installed at the end of the concrete section is shortened, and when the inner formwork is used for the wall of a newly excavated pit, the equipment needed to transport it to the tail of the shield machine can be reduced. In addition, even if a release agent is used on the inner formwork in consideration of demolding the inner formwork, it does not depend on the adhesion force that occurs between the inner formwork and the concrete lining, which has many uncertainties, as in the past. There is no need to do this, and it is possible to reliably obtain a predetermined jacking reaction force.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, and FIG. 1 is a side sectional view of a tunnel showing an outline of a method for receiving the jacking reaction force of a shield machine in the non-segment shield construction method; 2 is a longitudinal cross-sectional view of the tunnel shown in the arrow direction ■-■ in FIG. 1, FIG. 3 is a longitudinal cross-sectional view of the tunnel shown in the arrow direction ■-■ in FIG. FIG. 3 is a partially enlarged view showing the drive mechanism of FIG. E: Ground, R: Concrete lining, C: Consolidated concrete section, S:
...device (device that receives the jacking reaction force of the shield machine),
1... Shield machine, 2... Glossy, 3
...Inner frame (inner formwork), 4...Outer frame (outer formwork), [0...Reaction force cradle, 11...Reaction force cart, 12 ... Fixed part 1 year old, 13 ... Spreader 114 ... Suppression jack, 15 ... Frame body, 16 ... Drive mechanism.

Claims (2)

[Claims] (1) Along the wall of the pit formed at the rear of the shield machine, an inner formwork and an outer formwork each having a predetermined width, which are divided into a plurality of parts, are assembled into a cylindrical shape by integrating them with connecting members, and then Concrete is poured between the formwork and the outer formwork to provide a concrete lining, and when this concrete lining hardens, the rear inner form of the inner formwork that is connected to the inside of this concrete lining is The jack reaction force of the shield machine in the non-segment shield construction method, in which the frame is separated from the outer formwork and dismantled, and then used as the inner formwork to be assembled on the wall of a newly excavated tunnel while constructing an underground tunnel, was evaluated. The method is characterized in that the shield machine is propelled while directly receiving the jack reaction force transmitted through the inner formwork installed inside the concrete lining using a reaction force cradle. How to receive the jack reaction force of a shield machine. (2) A device that receives the jack reaction force of the shield machine in the non-segment shield construction method, and is used to line the wall of the excavated pit with concrete lining through the inner formwork installed on the wall of the pit. It comprises a reaction force cradle that supports the jack reaction force, a reaction force carriage that supports the reaction force cradle on a hardened concrete lining, and a fixing member that fixes the reaction force cradle to the reaction force carriage. , the reaction truck includes a spreader that is pressed against the inner wall surface of the concrete lining, a pressing jack that is extendable and retractable toward the wall surface in order to press the spreader against the inner wall surface of the pit, and a frame that holds the pressing jack. 1. A device for receiving jack reaction force of a shield machine, characterized in that it has a drive mechanism that moves the frame along the tunnel excavation direction.