JP2630667B2 - Underground docking method for shield tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to underground docking of a shield tunnel in which a pair of shield excavators are excavated so as to face each other and the ends of both shield tunnels are joined underground. Concerning the construction method.

(Conventional technology) Generally, in the shield method, there is a limit to the excavation length of one shield excavator. When constructing a long tunnel, a shaft must be dug at each limit length, and the cutter of the excavator must be replaced. In this case, another excavator is used to excavate to the next shaft.

However, if the shafts are constructed at small intervals, the cost will increase accordingly, so the distance between the shafts is lengthened, a pair of shield excavators are excavated in opposite directions, and both tunnels are docked underground Construction methods are being developed.

On the other hand, when docking the shield tunnel underground in a ground with high water pressure and low ground stability such as a submarine tunnel, there is a problem that there is a high risk of flooding and collapse of the ground.

For this reason, as a conventional underground docking method in such a ground, the ground around the docking portion is frozen, or a chemical solution is injected into the ground to solidify it, thereby stopping the water stoppage and the collapse of the ground. And a method in which a connecting cylinder is provided at the tip of one shield excavator so as to be able to protrude, and a method of bridging between the two shield excavators has been developed.

(Problems to be Solved by the Invention) The above-described conventional method of freezing the ground requires a long time and a large amount of work until the freezing is completed, and the method of injecting a chemical solution requires a large amount of expensive chemical solution to be injected. Therefore, there is a problem that a large amount of cost is required, and sufficient consolidation cannot be expected when there is a flow of groundwater.

In addition, in the method of bridging the connecting cylinder, it is necessary to excavate the ground between both shield excavators before projecting the connecting cylinder.If the ground is extremely unstable, it cannot be performed by itself. However, there is a problem that it is necessary to use a freezing method and a chemical solution injection in combination.

An object of the present invention is to provide an underground docking method of a shield tunnel that can be docked quickly and safely at low cost in view of the problems of the various conventional methods described above.

(Means for Solving the Problems) A feature of the present invention for solving the above-described conventional problems is that a pair of shield excavators are dug in directions facing each other, and the two shield excavators are used underground. In the underground docking method of a shield tunnel in which the shield tunnels communicate with each other, the shield tunnel of one of the two shield excavators is free to protrude in the distal end side extension direction of the shield cylinder and rotate A docking seal cylinder that can be driven and has a cutter bit protruding at the tip is provided, and the docking seal cylinder is provided with a solidifying agent injection path having an outlet opening at the inner surface of the tip of the cylinder,
After the tip of the other shield excavator is fitted into the docking seal cylinder, the two shield excavators approach the opposed arrangement, and then the docking seal cylinder is rotated from one shield excavator. After cutting the underground and moving forward, and reaching the tip outside the outer periphery of the shield cylinder tip of the other shield excavator, the outer peripheral surface of the shield cylinder tip of the other shield excavator and the docking seal cylinder A liquid solidifying agent is injected between the inner peripheral surfaces of the distal ends through the solidifying agent injection passage, and after the solidifying agent is solidified, the shield excavator is excavated to communicate with each other.

(Operation) In the method of the present invention, the cylinders of the thickness of the docking seal cylinder are advanced by aligning the axes of the two shield excavators, approaching each other, and rotating and moving the one side of the docking seal cylinder. The mold groove is cut, and the docking seal cylinder advances in the mold groove. When the tip of the docking seal cylinder reaches the outer periphery of the tip of the opposing shield machine, the cutter cylinder is hung between the two shield cylinders, and the collapse of the ground outside is prevented. In this state, the liquid solidifying agent is sent from the inside of the shield excavator on one side to the solidifying agent injection path, so that the water between the inner surface of the tip end of the cutter tube and the outer surface of the inner shield tube is stopped, and the leakage of groundwater is completely completed. Will be shut off.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 show a shield excavator A on one side used in the present invention. In the figure, 10 is a cylindrical shield tube, 11 is a segment assembling apparatus,
Reference numeral 12 denotes a lining wall by a segment, and 13 denotes a jack for pushing out the shield tube 10 by taking a reaction force against the lining wall.

Inside the distal end of the shield tube 10, there is a partition wall 14 that blocks the front and rear.
The excavation and kneading chamber 15 is provided on the front side.

A bearing 16 is fixed to the center of the partition wall 14.
The cutter shaft 17 is slidably supported in the axial direction.

At the tip of the cutter shaft 17, four cutter spokes 18, 18, ... are fixed radially. Each of the cutter spokes 18 has a cutter bit 19 on the front side and a kneading bit 20 on the rear side. A copy cutter 21 is provided at the tip so as to be able to move in and out in the axial direction.
Hydraulic cylinder inside cutter spoke 18 as shown
The access operation is performed by 22.

The rear end of the cutter shaft 17 is rotatably connected to the drive base 23 so as to be immovable in the axial direction, and is rotatably driven by a hydraulic motor 24 supported by the drive base 23. Has become.

The drive base 23 cannot rotate with respect to the shield tube 10,
Further, the cutter shaft 17 is supported so as to be movable in the axial direction, and is reciprocated in the axial direction of the cutter shaft 17 by the hydraulic cylinder 25.

 In the figure, reference numeral 26 denotes an excavated soil discharging device.

A docking seal cylinder 30 is provided on the outer periphery of the distal end portion of the shield cylinder 10 so as to be movable in the front extension direction with respect to the shield cylinder 10 and rotatable. When the docking seal cylinder 30 is at the most retracted position, the tip protrudes longer than the tip of the shield cylinder 10, and the cutting bit 31 is fixed to the peripheral surface of the tip. On the inner surface of the docking seal cylinder 30, at least two axially symmetric concave grooves 32, 32,... For engaging the cutter spokes are formed at intervals in the axial direction as shown in FIG. Have been. Then, the cutter spokes 18 are drawn into the docking seal cylinder 30, and the copy cutter 21 is protruded in a state where the tip faces the concave groove 32, whereby the distal end of the copy cutter 21 is engaged in the concave groove 32, By operating the cutter spokes 18 in this state, the docking seal cylinder 30 is operated together.

The docking seal cylinder 30 has a plurality of discharge ports 33 for injecting the solidifying agent at predetermined intervals in the circumferential direction on the inner peripheral surface of the distal end portion thereof.

Each discharge port 33 communicates with a continuous solidifying agent injection path 34, and a base end 34 a of the injection path 34 is opened on the inner peripheral surface on the rear end side of the docking seal cylinder 30.

On the other hand, in the shield cylinder 10, when the docking seal cylinder 30 advances, a work window 35 is provided at a position facing the base end 34a of the injection path 34, and is always closed by the lid 35a.

Next, a docking method for a shield tunnel using the shield machine described above on one side will be described.

As shown in FIG. 4 (a), one shield excavator A and the other shield excavator B are excavated in opposite directions from both ends of the tunnel to be excavated. In the shield machine B, the shield cylinder 10 is extended to the distal end side instead of the docking seal cylinder 30, and the excavation kneading chamber 15 is extended.
Is used, except that it has the same structure as the shield machine A described above. However, as the shield machine B, a shield cylinder 10 having at least the outer diameter at the distal end smaller than the above-described docking seal cylinder 30 is used.

In the drawings, the same components of both shield machines A and B are denoted by the same reference numerals, and description thereof is omitted.

Both shield excavators A and B are excavated together, and shield tunnels a and b are sequentially excavated and formed.

At this time, the shield excavator A excavates as a part of the shield cylinder 10 without rotating and driving the docking seal cylinder 30 in the most retracted state as shown in FIG. 4 (a). Then, the course is adjusted underground, and the shield tubes 10, 10 are brought closer to each other at a predetermined position with the axes of the shield tubes 10, 10 aligned. And between them, Chichi 38
The excavation is stopped while leaving the.

Next, the cutter spoke 18 is connected to the docking seal cylinder 30.
The copy cutter 21 is protruded with the front end facing the concave groove 32, and the front end is inserted into the concave groove 32. In this state, the cutter spoke 18 is advanced while rotating. This rotates the docking seal cylinder 30 as shown in FIG. 4 (b), and advances while cutting the ground into a cylindrical shape at the cutting pit. And cutter spoke 18
After moving forward by one stroke of the hydraulic cylinder 25, it is stopped, the copy cutter 21 is pulled in, the cutter spoke 18 is pulled back, the copy cutter 21 is protruded, the engagement position is changed to another groove 32, and the rotation is performed again. Move forward while driving.

By repeating this, the docking seal cylinder 30 is advanced, and its tip reaches the outer periphery of the tip of the shield cylinder 10 of the other shield excavator B as shown in FIG.

Then, the window 35 of the shield cylinder 10 of the shield machine A is opened, and the docking seal cylinder 30 is turned and stopped so that the base end 34a of the solidifying agent injection path 34 faces the window 35. A tube 36 from an injection pump is connected to the base end 3a to inject a liquid solidifying agent. As a result, the solidifying agent is injected from the discharge port 33 into the gap 37 between the inner surface of the docking seal cylinder 30 and the outer surface of the tip of the shield cylinder 10 of the other shield machine B, and closes the gap.

After the docking seal cylinder 30 is spanned between the tip ends of the shield cylinders of both the seal excavators A and B in this manner, one of the cutter spokes 18 is rotated to excavate the remaining unexcavated portion, and then the cutter spokes are rotated. Then, a cutter frame such as a partition wall is removed, tunnels a and b are communicated with each other, and lining is applied inside the shield tubes 10, 10 and the docking seal tube 30.

(Effect of the Invention) As described above, in the docking method of the shield tunnel of the present invention, the docking seal cylinder provided with the cutting bit at the tip from the outer circumference of the shield cylinder of one shield excavator is advanced while rotating, and the ground is removed. While cutting into a cylindrical shape, extending to the outer periphery of the tip of the other shield excavator, bridging the docking seal cylinder between both shield cylinders, injecting the solidifying agent from the discharge port on the inner surface of the tip of the docking seal cylinder, By excavating the ground left inside after sealing the gap between the inner surface of the cylinder and the outer surface of the shield cylinder,
It is easy to inject the solution for solidification, and it is necessary to use only a small amount of space between the docking seal cylinder and the inner surface of the tip and the outer surface of the tip of the other shield cylinder. The inside is completely connected with the ground left inside, so that the docking operation can be performed quickly and safely at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of one shield machine used in the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a partial perspective view of an inner surface of a docking seal cylinder. 4 (a) to 4 (c) are sectional views of the docking operation process. A, B ... shield excavator, a, b ... shield tunnel, 11 ... segment assembly equipment, 12 ... lining wall, 13 ... jack, 14 ... bulkhead, 15 ... excavation kneading chamber, 16 ... ... Bearing, 17 ... Cutter shaft, 18 ... Cutter spoke, 19 ... Cutter bit, 20 ... Kneading bit, 21 ... Copy cutter, 22 ... Cylinder, 23 ... Stand, 24 ... Hydraulic motor, 25 ... hydraulic cylinder, 6 ... excavated soil discharger, 30 ... seal cylinder, 31 ... cutting bit, 32 ... concave groove, 33 ... discharge port, 34 ... injection path, 34a ... base end, 35 ... window, 35 a ... lid, 36 ... tube, 37 ... gap 38 ... ... ground.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Masahiro Tsujiguchi 2-8-2 Koraku, Bunkyo-ku, Tokyo Inside Goyo Construction Co., Ltd. (72) Hiroshi Saeki 2-2-2 Koraku, Bunkyo-ku, Tokyo Inside Goyo Construction Co., Ltd. (72) Takeshi Ogasa, 2-2-2-8 Koraku, Bunkyo-ku, Tokyo Inside Goyo Construction Co., Ltd. (72) Kazuto Hamada 2-2-2-8, Koraku, Bunkyo-ku, Tokyo 5 (56) References JP-A-62-258096 (JP, A) JP-A-1-278690 (JP, A) JP-A-1-223291 (JP, A)

Claims (1)

(57) [Claims] An underground docking method of a shield tunnel in which a pair of shield excavators are excavated in directions facing each other and a shield tunnel formed by the two shield excavators communicates with each other in the ground. A docking seal cylinder is provided on the outer periphery of the distal end portion of the shield cylinder of the shield excavator, which is capable of protruding in the extension direction of the distal end side of the shield cylinder, can be driven to rotate, and has a cutter bit protruding at the distal end thereof. The cylinder is provided with a solidifying agent injection path having a discharge port opened at the inner surface of the tip of the cylinder, and the tip of the other shield machine is fitted in the docking seal cylinder. After approaching the excavator to the opposing arrangement, rotate the docking seal cylinder from the shield excavator on one side and cut the ground After the tip reaches the outer periphery of the tip of the shield cylinder of the other shield excavator, the solidifying agent is disposed between the outer periphery of the tip of the shield cylinder of the other shield excavator and the inner periphery of the tip of the docking seal cylinder. An underground docking method for a shield tunnel, characterized by injecting a liquid solidifying agent through an injection passage, waiting for the solidifying agent to solidify, excavating between the shield excavating machines, and communicating with each other.