JPH08121078A - Tunnel construction method and tunnel excavating machine - Google Patents

Abstract

PURPOSE: To construct a straight tunnel route and a curved tunnel route connected to the straight tunnel route with high efficiency toward an arrival shaft from a starting shaft. CONSTITUTION: Hume pipe-made straight pipes 6 are connected to ring-shaped segments 3 assembled in a tunnel excavating machine main body 1 by way of an adaptor 5 one after another and started from the start side of a shaft based on a shield tunneling method, thereby constructing a straight tunnel route having a specified length comprising straight pipes. Then, a tunnel excavating machine is advanced by extending a shield jack 13 under jacking reaction at the front end of the ring-shaped segments 3 comprising tapered segments assembled in the tunnel excavating machine main body 1 while the ring-shaped segments 3 are pushed out into the excavated tunnel. These ring-shaped segments 3 are connected one after another, thereby constructing a segment lining-made curved tunnel route in the rear of the tunnel excavating machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a tunnel in which a planned route changes from a straight route to a curved route, and a tunnel excavator suitable for carrying out this method.

[0002]

2. Description of the Related Art Conventionally, as a method for constructing a tunnel, a method mainly using a propulsion method and a method using a shield method have been independently adopted. The propulsion method is a method in which the fume pipe is pushed from the starting shaft side by a propulsion jack installed in the starting shaft after the tunnel excavator to push and embed it up to the reaching shaft, and the shield method is at the front end opening. It is assembled in a ring shape by using a shield excavator in which a front body having a cutter plate rotatably arranged and a rear body which is configured to assemble the segments inside are flexibly connected to each other. It is a method of excavating a tunnel with a shield excavator while supporting the propulsive reaction force on the segment lining.

[0003]

However, according to the above-mentioned propulsion method, it is possible to construct a straight tunnel line by propelling a straight pipe such as a fume pipe from the starting shaft side, but a curved tunnel line is constructed. I can't. On the other hand, in the shield construction method, segments are assembled into a ring shape in the rear part of the shield excavator, and then a reaction force is applied to this ring-shaped segment to advance the shield excavator. It is possible not only to construct a straight tunnel line part by construction, but also to construct a curved tunnel line part by using a taper segment,
The construction of a straight tunnel line portion has a problem that not only is it uneconomical because the material cost and construction cost are higher than the propulsion method of propelling and burying the above-mentioned fume pipe, and the tunnel construction period is prolonged. It is an object of the present invention to provide a tunnel construction method capable of completely eliminating such problems and a tunnel excavator for carrying out the method.

[0004]

A tunnel construction method according to the present invention for achieving the above object is a tunnel construction method in which a planned route is changed from a straight route to a curved route, and a tunnel excavator is provided at a rear end of the tunnel excavator. , An adapter whose front end is connected to a segment assembled in the tunnel excavator and whose rear end is connected to a straight pipe composed of a fume pipe is provided, and a straight line is an adapter from the starting shaft side to the rear end of the tunnel excavator. After that, a straight pipe was successively promoted and buried to construct a curved line, and a taper segment was assembled in the tunnel excavator.The segment lining was connected to the front end of the straight pipe through an adapter while the tunnel excavator was being advanced. It is characterized by constructing by forming.

Further, in a tunnel excavator used for carrying out this tunnel construction method, a segment is assembled inside a front body having a cutter plate rotatably arranged at a front end opening and a propulsion jack inside. The rear body, which is configured as described above, is flexibly connected to each other, and at the rear end of the rear body, the front half is formed into a small-diameter short tubular portion that is approximately equal to the cross-sectional shape of the segment lining to be assembled, and the rear half is formed. Has a structure in which an adapter having a larger diameter on the outer peripheral surface than that of the short tubular portion and formed in the expanded short tubular portion having substantially the same cross-sectional shape as a straight tube made of a fume tube is provided.

[0006]

[Operation] When a straight pipe made of a fume pipe is successively added to the tunnel excavator from the starting shaft to propel it in sequence, the propulsive force is applied to the adapter installed at the rear end of the tunnel excavator via the straight pipe. The front end of this adapter is received by the propulsion jack of the tunnel excavator through the segment assembled in the tunnel excavator, so that the tunnel excavator excavates integrally with the straight pipe and moves from the straight pipe row. A straight line will be built.

After a straight line having a planned length has been built, when a curved tunnel line portion is built toward the reaching shaft on the front side of the straight line, a tapered segment is formed in the rear trunk of the tunnel excavator. When the tunnel excavator is excavated by assembling the ring-shaped taper segment to the front end face of the adapter and applying a reaction force to the ring-shaped taper segment with a propulsion jack, Are extruded into the excavation tunnel as a segment lining with the adapter. The ring-shaped taper segments are sequentially extruded into the excavation tunnel while being assembled to construct a desired curved tunnel line portion composed of segment linings.

The adapter has a small-diameter short tubular portion whose front half is approximately equal to the cross-sectional shape of the lining segment to be assembled, and the latter half is a fume tube whose outer peripheral surface is larger than the short tubular portion. Since it is formed in the expanded short tube part that is approximately equal to the cross-sectional shape of the straight pipe, when the straight pipe is buried by the above-mentioned propulsion method, the outer diameter of the straight pipe is formed to be approximately the same as the outer diameter of the body of the shield excavator. However, the thrust force can be reliably transmitted to the segment side assembled in the body, and the tail seal of the tunnel excavator is slidably contacting the outer peripheral surface of the segment. Lubricant or the like injected between the outer circumference of the pipe or the lining segment and the excavation tunnel surface can be prevented from entering.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a tunnel excavator, in which the excavator main body 1 has a cutter plate 11 rotatably disposed at a front end opening. And a cylindrical rear body 1b having the same outer diameter as the front body 1a and having a front end small-diameter cylindrical portion flexibly connected to the rear end inner peripheral surface of the front body 1b. Consisting of the front torso 1a
A partition wall 1c is stretched inside the partition wall 1c to support a cutter plate 11 rotatably on the partition wall 1c, and a rotation driving motor 12 for the carter plate 11 is mounted on the back side of the partition wall 1c. Further, the direction correcting jacks 14 are mounted on the inner peripheral surface of the front body 1a at a plurality of positions in the circumferential direction at regular intervals, and the propulsion jacks are mounted at a plurality of positions on the inner peripheral surface of the front body of the rear body 1b at a constant interval in the peripheral direction. I am wearing 13.

Each direction correction jack 14 has its rod end pivotally attached to the inner surface of the front end portion of the rear body 1b to expand and contract the rod, thereby bending the front body 1a with respect to the rear body 1b to form the planned curve tunnel route direction. It is configured to point to. Further, the earth and sand excavated by the cutter plate 11 are discharged by the earth discharging means 16 through the tunnel to the side of the starting shaft A.

A segment assembling erector 2 is arranged at the front end of the rear body 1b, and the assembled ring-shaped segment 3 is provided around the inner periphery of the rear end of the rear body 1b. The tail seal 4 is slidably contacted, and further, the front end surface of the ring-shaped segment 3 is configured to receive the spreader 15 mounted on the rod end of the propulsion jack 13.

Reference numeral 5 denotes an annular adapter which is interposed between the ring-shaped segment 3 and the straight tube 6 made of a fume tube.
The first half is a small-diameter short tubular portion 5a in which the inner and outer diameters of the ring-shaped segment 3 are formed to have the same inner and outer diameters.
The outer peripheral surface is formed as an inclined surface 5c that is gradually expanded in diameter from the outer peripheral surface of the small-diameter short cylindrical portion 5a, and is formed as a large-diameter short cylindrical portion 5b whose inner and outer diameters are equal to the inner and outer diameters of the straight pipe 6, respectively. Further, further, a ring-shaped projecting piece 5d formed to have the same outer diameter as that of the straight tube 6 is provided so as to project rearward from the outer peripheral edge of the rear end of the expanded tube body 5b. It is configured such that it is fixed to the outer peripheral surface of the front end of the straight pipe 6 of the portion in a fitted state.

The straight pipe 6 made of a fume pipe has an outer diameter equal to the outer diameters of the body portions 1a and 1b of the excavator body 1 and an inner diameter equal to the inner diameter of the ring-shaped segment 3. Therefore, the inner peripheral surfaces of the ring-shaped segment 3, the adapter 5, and the straight pipe 6 are formed to be flush with each other.

Next, while the tunnel excavator constructed as described above is being used to excavate the tunnel, a straight line and a curved line connecting to this straight line are constructed on the tunnel planned line between the starting shaft A and the reaching shaft B. Describe the method. First, the straight pipe 6 consisting of a fume pipe is followed from the excavator shaft 1 to the excavator main body 1 from inside the starting shaft A, and the straight pipe 6 is pushed and buried in the ground by pushing the straight pipe propulsion jack 7 installed in the shaft A. .
At that time, the segments are assembled in advance in the rear body 1b of the excavator body 1 in a ring shape, and the outer peripheral surface of the ring-shaped segment 3 is slidably contacted with the tail seal 4 to prevent the entry of groundwater or the like. At the same time, the spreader 15 of the propulsion jack 13 is brought into contact with the front end surface of the ring-shaped segment 3 and the small-diameter short tubular portion 5a of the adapter 5 is connected to the rear end surface thereof, while the ring of the enlarged-diameter short tubular portion 5b of the adapter 5 is connected. The protruding piece 5d is fixed to the outer peripheral surface of the front end of the straight pipe 6 at the forefront.

When the rear end face of the straight pipe 6 is pushed forward by the straight pipe propulsion jack 7 in this state, the propulsive force is transmitted to the propulsion jack 13 of the tunnel excavator through the adapter 5, the ring-shaped segment 3 and the spreader 15. The excavator body 1 to which the propulsion jack 13 is attached is constantly pushed forward. Then, the cutter plate 2 is rotated in accordance with the propulsion, and the tunnel is dug. At this time, the front body 1a of the excavator main body 1 is oriented in the planned straight line direction. In order to smoothly propel the straight pipe 6, a lubricant is injected from within the straight pipe 6 between the excavated ground and the outer peripheral surface of the straight pipe 6.

In this way, when one straight length straight pipe 6 is propelled and buried in the ground, the next straight pipe 6 is connected to the straight pipe 6 and pushed by the straight pipe propulsion jack 7 to be straightened by the tunnel excavator. While excavating the tunnel, straight pipe 6
Is buried, and this work is repeated to construct a straight line of a predetermined length in which the straight pipe 6 is connected in series to the planned straight line as shown in FIG.

Next, as shown in FIG. 3, a curved line consisting of lining segments is constructed from this straight line to the planned curved line toward the reaching shaft B. The method is to operate the direction correcting jack 14 to move the front body 1a of the tunnel excavator to the rear body 1b.
After being bent in the direction of the planned curved line, the spreader 15 at the rod end of the propulsion jack 13 is brought into contact with the front end face of the ring-shaped segment 3 assembled in the rear body 1b of the excavator body 1. This is done by extending the propulsion jack 13.

That is, when the propelling jack 13 is extended, the ring-shaped segment 3 is attached to the front end of the straight pipe 6 by the adapter 5.
Since the tunnel excavator is moving forward in accordance with the extension amount of the propulsion jack 13 while the ring-shaped segment 3 receives the propulsion reaction force, the tunnel excavator advances the tunnel by rotating the cutter plate 2. Then, the ring-shaped segment 3 is extruded together with the adapter 5 into the tunnel excavated according to the excavation, and the ring-shaped segment 3 forms a segment lining having a constant length.

When it is desired to construct a straight line shorter than the length of the straight pipe 6 from the front straight pipe 6, a ring-shaped segment having the same width in the tunnel length direction over the entire circumference is used. Assembling, this ring-shaped segment may be connected to the straight pipe 6 in series by one or a plurality of rings and the above-mentioned construction method. After that, the ring-shaped segment 3 by the taper segment may be connected to this ring-shaped segment. . The tapered segment is formed such that the width in the tunnel length direction of the curved surface curved along the peripheral wall of the tunnel is gradually narrowed from one end to the other end in the tunnel circumferential direction. By combining a plurality of them in the circumferential direction of the tunnel, a ring-shaped segment 3 is formed in which the tunnel bending outer surface side 3a has a wide tunnel length direction and the tunnel bending inner peripheral surface side 3b has a narrow tunnel length direction.

As described above, the taper segment 1
When the bent segment lining portion 31 having a constant length is built by the ring-shaped segment 3 for the ring, the next ring-shaped segment 3 is connected to the bent segment lining portion 31 and the front end of the ring-shaped segment 3 is similar to the above. The tunnel excavator is excavated by applying a propulsive reaction force to the surface, and the ring-shaped segment 3 is extruded into the tunnel to be excavated to construct the bent segment lining portion 32.

The taper segment is carried into the excavator main body 1 from the starting shaft A side through a straight line consisting of a straight pipe array, and the taper segment is sequentially assembled by the erector 2 into the ring-shaped segment 3 and then the shield excavator. The segment lining portion is formed in the curved tunnel portion excavated by propulsion as described above, and this work is repeated to construct a curved line by the segment lining on the planned curved route.

[0022]

As described above, according to the tunnel construction method of the present invention, there is provided a tunnel construction method in which the planned route changes from a straight route to a curved route, in which the front end is at the rear end of the tunnel excavator. An adapter that is connected to the segment assembled in the excavator and connected to a straight pipe consisting of a fume pipe at the rear end is installed, and the straight line runs straight from the start shaft side to the adapter at the rear end of the tunnel excavator. Constructed by sequentially propelling and burying pipes, and constructing curved lines by assembling taper segments in the tunnel excavator ゝ While excavating the tunnel excavator, by forming a segment lining connected to the front end of the straight pipe via an adapter Since it is characterized by construction, a straight line consisting of straight pipe rows is formed by the propulsion method, and then the shield construction method is continuously applied to the straight line. Those capable of construction smoothly the tunnel portion of the curve line segment lining by assembling the tapered segment while excavation with more along the tunnel boring machine in the plan curve route.

At this time, the taper segment for constructing the curved line can be carried into the tunnel excavator from the starting shaft side through the straight line formed by the straight pipe line, and the construction work of the curved line connected to the straight line is efficient. As well as doing well, a straight line between the starting shaft and the reaching shaft by a straight pipe,
Since the curved line is continuously constructed by the taper segment, the construction period can be shortened and the construction cost and the material cost are reduced, which is extremely economical.

Further, the tunnel excavating machine for carrying out this method is constructed such that the cutter plate is rotatably disposed at the front end opening and the segments are assembled inside the front body having the propulsion jack inside. And a rear body, which are bent to each other, are flexibly connected to each other, and at the rear end of the rear body, a front half portion is formed into a small-diameter short tubular portion substantially equal to the sectional shape of the segment lining to be assembled, and the rear half portion is the short tubular portion. The diameter of the outer peripheral surface is larger than that of the section, and the structure is such that the adapter is formed in the expanded diameter short tube part that is approximately equal to the cross-sectional shape of the straight tube made of Hume tube, so tunnel excavation by the propulsion method When burying a straight pipe having an outer diameter that is approximately equal to the outer diameter of the machine, make the tail packing around the inner surface of the rear body of the tunnel excavator slidably contact the outer surface of the segment. The segment through the adapter Propulsive force can be reliably transmitted, and an adapter is attached to the front end of the straight pipe at the forefront of the straight line when constructing a curved line by segment lining that continues on the straight line while excavating the tunnel excavator. It is possible to build a curved line while accurately connecting the segment linings through.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional side view of a tunnel excavator,

[Figure 2] Simplified cross-sectional view of a state where a straight line is being constructed,

FIG. 3 is a simplified cross-sectional view showing a state where a curved route is being constructed.

[Explanation of symbols]

 1 Excavator body 1a Front body 1b Rear body 2 Erector 3 Ring segment 4 Tail seal 5 Adapter 6 Straight pipe 13 Propulsion jack

Claims (2)

[Claims] 1. A method for constructing a tunnel in which a planned route is changed from a straight route to a curved route, wherein a front end is connected to a rear end of a tunnel excavator, a front end is connected to a segment assembled in the tunnel excavator, and a rear end is a fume. A straight line is constructed by arranging an adapter to be connected to a straight pipe, and constructing a straight line from the starting shaft side by advancing and burying the straight pipe in succession after the adapter at the rear end of the tunnel excavator. Is a method of constructing a tunnel characterized by assembling a taper segment in a tunnel excavator and forming a segment lining that is connected to the front end of a straight pipe via an adapter while advancing the tunnel excavator. 2. A front body in which a cutter plate is rotatably disposed in a front end opening and a propulsion jack is internally mounted, and a rear body configured to assemble the segments therein are bendable with respect to each other. At the rear end of the rear body, the front half is formed into a small-diameter short tubular portion having a cross-sectional shape approximately equal to that of the segment lining to be assembled, and the latter half has a larger outer peripheral surface than the short tubular portion. A tunnel excavator characterized in that an adapter formed in a short-diameter expanded tubular portion having a cross section of a straight pipe made of a fume pipe is arranged.