JPH0452396A - Construction method for docking of shield tunnel underground - Google Patents

Abstract

PURPOSE:To prevent outside natural ground from collapsing by providing a docking sealing tube to the outer periphery of the end portion of the shield tube of one of shield excavators which excavate the ground while being opposite to each other, and sticking a material to be cut over the overall circumference of the end of the shield tube of the other shield excavator, and cutting the material to fit both shield tubes with each other. CONSTITUTION:Shield excavators A, B are operated to excavate the ground while being opposite to each other. Excavation is then stopped with the centers of the axes of the shield tubes of the shield excavators A, B being adjusted to each other and the natural ground 34 left between both of the shield excavators A, B. When the shield excavator A advanes while rotating its cutter spoke 18, its sealing tube 30 for docking is rotated and the excavator A advances while its cutting bit cuts the natural ground. Then the sealing tube 30 for docking cuts a material 33 to be cut which is stuck on the outer periphery of the end of the shield tube of the shield excavator B, and is fitted and hanged between both shield tubes 10. Further, a remaining part not yet excavated is excavated by the cutter spoke 18. Thereby, the work of docking tunnels with each other is promptly and safely carried out at low cost.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to underground docking of a shield tunnel, in which a pair of shield tunneling machines are made to face each other, and the tips of both shield tunnels are connected underground. Regarding construction methods.

(Conventional technology) In general, in the shield method, there is a limit to the length of excavation that can be made by one shield excavator, and when constructing a long tunnel, it is necessary to dig a shaft for each limit length and replace the cutter of the excavator. The method used is to use another excavator to dig to the next shaft.

However, constructing shafts at small intervals increases the cost accordingly, so the distance between the shafts is lengthened, and a pair of shield tunneling machines are dug in opposite directions to drill both tunnels underground. A method has been developed to do so.

On the other hand, when a shield tunnel is docked underground in a ground with high water pressure and low stability, such as an undersea tunnel, there is a problem that there is a high risk of water leakage or collapse of the ground.

For this reason, the conventional underground docking method in such ground is to freeze the ground around the docking part or inject a chemical solution into the ground to solidify it, thereby stopping the water and preventing the ground from collapsing. A method of preventing
A method has been developed to pass the wire between both shield tunneling machines.

(Problems to be Solved by the Invention) The conventional method of freezing the ground described above requires a long time and a large amount of construction cost to complete freezing, and the method of injecting a chemical solution requires injecting a large amount of an expensive chemical solution. Therefore, there was a problem that it required a lot of cost and that it could not be expected to solidify sufficiently in cases where there is a flow of underground water.

In addition, in the method of hooking and passing the connecting tube, it is necessary to precisely align the axes of both shield tunneling machines facing each other, and if the connecting tube is even slightly misaligned, the connecting tube will not fit on the other side, so it is difficult to carry out construction work. There is a problem that the ground will be mixed in, and furthermore, it is necessary to excavate the ground between the two shield tunneling machines before protruding the connecting tube, and if the ground is extremely unstable, this cannot be done by itself. However, there was a problem as to whether it was necessary to use freezing methods or chemical injections in combination.

The present invention takes into account the various conventional construction methods described above,
The purpose of this invention is to provide an underground docking method for shield tunnels that enables quick, safe, and easy docking at low cost.

(Means for Solving the Problems) A feature of the present invention for solving the conventional problems as described above is that a pair of shield excavators are excavated in directions opposite to each other, and the two shield excavators are used to excavate underground. In an underground docking method for shield tunnels that communicates shield tunnels with each other, a rotatable material is provided on the outer periphery of the tip of the shield tube of one of the two shield tunneling machines, and is rotatable and protrudes in the extending direction of the tip side of the shield tube. A docking seal tube that can be driven and has a cutter bit protruding from its tip is provided, and a cut material that can be cut by the cutter bit of the docking seal tube is provided at the tip of the shield tube of the other shield excavator over the entire circumference. After they are fixed together and the two shield tunneling machines are brought close to facing each other, the docking seal tube is rotated from one shield tunneling machine and moved forward while cutting underground, and the tip of the shield tunneling machine is moved forward while cutting underground. The method is to cut the material to be cut at the tip of the shield tube of the other shield tube and fit it with the tip of the shield tube, and then excavate between the two shield tubes to make them communicate with each other.

(Function) The construction method of the present invention allows the axes of both shield tunneling machines to be approximately aligned and brought close to each other, and the docking seal cylinder on one side is moved forward while rotating, so that the wall thickness of the docking seal cylinder is A cylindrical groove is cut through which the seal strip advances. Even after the tip of the seal tube reaches the tip of the shield tube of the other shield excavator, the cutting material at the tip of the other shield tube can be moved forward while rotating the docking seal tube. The tip of the docking seal tube fits into the cut groove, and the docking seal tube is passed between both shield tubes to prevent the ground from collapsing on the outside.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

1 to 3 show one side of shield excavation 11A used in the present invention. In the figure, 10 is a cylindrical shield tube, 11 is a segment assembly device, 12 is a lining wall made of segments, and 13 is a jack for pushing out the shield tube 10 by applying a reaction force to the lining wall.

Inside the tip of the shield tube 10, there is a partition wall 1 that blocks the front and back.
4 is provided, and the front side thereof is used as an excavation and kneading chamber 15.

A bearing 16 is fixed to the center of the partition wall 14, and a cutter shaft 17 is supported on the bearing 16 so as to be slidable in the axial direction.

At the tip of the cutter shaft 17, four cutter spokes 18, 18, .
9, a kneading bit 20 is protruded from the rear side, and a copy cutter 21 is provided at the tip so that it can be moved in and out in the axial direction, and as shown in FIG. 22 for entry and exit operations.

tll and t4A of the cutter shaft 17 are connected to the drive frame 23 so as to be rotatable and immovable in the axial direction, and are rotationally driven by a hydraulic motor 24 supported by the drive frame 23. It has become.

The driving frame 23 is supported so as to be non-rotatable and movable in the axial direction relative to the shield cylinder 10, and is reciprocated in the axial direction of the cutter shaft 17 by the hydraulic cylinder 25.

26 in the figure is an excavated soil discharge device.

A docking seal cylinder 30 is installed on the outer periphery of the tip of the shield cylinder 10 so as to be movable in the forward extension direction of the shield cylinder 10 and rotatable. When the docking seal cylinder 30 is in the most retracted position, its tip protrudes longer than the tip of the shield cylinder 10, and a cutting bit 31 is fixed to the circumferential surface of the tip.
The inner surface of the dotting seal cylinder 30 is provided with grooves 32 for engaging cutter spokes in at least two axially symmetrical locations.
．． As shown in FIG. 3, a plurality of 32... are molded at intervals in the axial direction. Then, pull the cutter spoke 18 into the dotting seal tube 30 and make the tip concave. Copy cutter 2 facing 1132
1, the tip of the copy cutter 21 is engaged in the groove 32, and by operating the cutter spoke 18 in this state, the docking seal cylinder 3 is engaged.
0 are to be operated together.

In addition, the other shield tunneling machine B, as shown in Fig. 4,
The above-mentioned docking seal f is attached to the tip of the shield tube 10.
A small diameter portion 10a is formed to be smaller than the inner diameter of the i30, and a material to be cut 33 is fixed to the entire outer circumference of the small diameter portion 10a to a thickness similar to -. The material to be cut 33 is made of a hard synthetic resin material or gun metal, which has a strength that will not be damaged by friction against the ground during excavation, and which can be easily cut with the cutting bit 31 of the docking seal Fj30. The other parts of this shield excavator B are the same as those of the shield excavator IIA described above, and the same parts are given the same reference numerals and the explanation will be omitted.

Next, shield excavation 11 configured in this way! We will explain the shield tunnel docking method using AB on both sides.

As shown in Figure 5 (a), one of the shield excavations I! lA and
The other shield excavator B is made to excavate in the opposite direction.

The shield tunnels a and b are sequentially excavated and formed by excavating both shield tunnels 1 mA and B together.

At this time, the shield tunneling machine A has a docking seal P.
530 in the most retreated state, it is allowed to dig as part of the shield MIO without being rotationally driven. Then, a course is prepared underground, and the shield cylinders 1o and 10 are brought close to each other at a predetermined position with their axes aligned. Then, the excavation is stopped with the ground 34 remaining between the two.

Next, seal F for dotting the cutter spoke 18!
The copy cutter 21 is inserted into the tip of the i30, the tip faces the groove 32, and the copy cutter 21 protrudes.
Insert it into 2. In this state, the cutter spoke 18 is rotated and moved forward.

As a result, the docking seal Fj30 rotates as shown in FIG. 5(b), and moves forward while cutting the earth into a cylindrical shape with the cutting bit. Then, after advancing the hydraulic cylinder 25 for the cutter spoke 18 by one stroke, it is stopped and the copy cutter 21 is pulled in. The cutter spoke 18 is pulled back, and the copy cutter 21 is projected and engaged with another groove 32. Change the position and move it forward while rotating it again.

Repeat this to move the docking seal tube 30 forward, and attach the tip of the seal tube 30 to the shield tube 10 of the other shield excavator B.
Then, the docking seal cylinder 30 is moved forward while rotating, and the material to be cut 33 on the outer periphery of the shield cylinder tip of the other shield excavator B is cut. As a result, as shown in FIG. 4(c), the docking seal cylinder 3
0 fits into the cutting material 33 while cutting a fitting groove by itself, and the hook is passed between the two shield cylinders 10 and 10.

After passing the dotting seal cylinder 30 between the tips of the shield cylinders of both shield excavators mA and B in this way, one of the cutter spokes 18 is rotated to excavate the remaining unexcavated portion, and the cutter spoke and The cutter frame such as the partition wall is removed, the tunnels a and b are made to communicate with each other, and a lining is constructed on the inside of the tunnel, leaving both shield plates 10° 10 and the docking seal tube 30.

<Effects of the Invention> As described above, the shield tunnel docking method of the present invention rotates and advances a docking seal cylinder equipped with a cutting bit at the tip from the outer periphery of the shield tunnel of one shield tunneling machine, thereby cutting the ground. By cutting it into a cylindrical shape and extending it to the outer periphery of the tip of the other shield excavator, and by passing a docking seal cylinder between both shield cylinders, the ground left inside is excavated. The docking part can be excavated without any fear of the mountain collapsing, and the tip of the docking seal tube cuts the material to be cut at the tip of the other shield tube to form a ridge into which it will fit. Therefore, even if there is some misalignment between the axes of both shield tunneling machines, a secure fit is achieved, making digging and docking work easier, and furthermore, there is no need for any chemicals to solidify the ground. Docking work can now be done quickly, safely and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one example of the shield tunneling machine used in the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a partial perspective view of the inner surface of the docking seal cylinder. , Figure 4 is a sectional view of the tip of the other shield tunneling machine, Figure 5 (a)
- (C) are cross-sectional views of the dotting work process. A, B...Shield excavator, a, b...Shield tunnel, 11...
・Segment assembly device, 12... Lining wall, 13
・・・・Jyatsuki, 14・・・・Bulkhead, 15・
...Drilling and kneading chamber 16 ... Bearing, 17 ... Cutter shaft, 18 ... Cutter spoke, 19 ... Cutter bit, 20
... Kneading bit, 21 ... Copy cutter 22 Old cylinder 23 ... Frame, 24 ... Hydraulic motor 25 ... Hydraulic cylinder 26... Excavation soil discharge device, 30... Seal simple, 31... Cutting bit, 32...
・Concave groove, 33... Material to be cut, 34...
Earthly mountain. Figure 4 Figure 1 Figure Δ Figure (A) Figure (C)

Claims (1)

[Claims] In an underground docking method for shield tunnels, in which a pair of shield tunneling machines are excavated in opposite directions, and the shield tunnels formed by both shield tunneling machines are connected to each other underground, one of the shield tunneling machines is A docking seal tube is provided on the outer periphery of the tip of the shield tube, which can freely protrude in the extension direction of the tip side of the shield tube, can be rotated, and has a cutter bit protruding from the tip. A material to be cut that can be cut by the cutter bit of the docking seal cylinder is integrally fixed to the tip of the shield cylinder over the entire circumference, and after both the shield excavators approach each other so as to face each other, the shield excavation on one side is performed. The docking seal tube is rotated from the machine and moved forward while cutting underground, and its tip cuts the material to be cut at the tip of the shield tube of the other shield excavator, and is fitted with the tip of the shield tube. After letting
This underground docking method for shield tunnels is characterized by excavating between both shield tunneling machines and making them communicate with each other.