JPH0452394A - Construction method for docking of shield tunnel underground - Google Patents

Abstract

PURPOSE:To cause tunnels to safely dock with each other underground at a low cost by providing a cutter bit to the end of one shield excavator, and providing the shield excavator with a sealing tube for docking which freely projects and can be rotary driven, and providing the other shield excavator with a shield tube having such a shape as to fitted with the sealing tube. CONSTITUTION:Shield excavators A, B are operated to excavate the ground and brought close to each other while being opposite to each other with the centers of the axes of their shield tubes 10 being adjusted to each other, and excavation is stopped while the natural ground 35 is left between both of time excavators. A liquid solidifying agent is injected from an injection nozzle 33 into the natural ground around the outer peripheral portion of the end of the shield tube 10 of the shield excavator B. The shield excavator A is operated to cut the natural ground with its cutting bit and advances and cuts the natural ground as far as a solidified portion 36 around the outer periphery of the end portion of the nozzle of the shield excavator B while its sealing tube 30 for docking is rotated. Then the end of the sealing tube 30 is fitted into a channel formed by cutting and the shield tubes 30 of the shield excavators A, B are connected at their ends to each other. A remaining part not yet excavated is excavated by the cutter spoke 18 of either of the shield excavators A, B. Thereby the work of causing tunnels to dock with each other underground is 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 increased, a pair of shield tunneling machines are dug in opposite directions, and both tunnels are docked underground. A construction method has been developed.

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. However, there was a problem in that it required a lot of money and that sufficient solidification could not be expected in cases where there was a flow of underground water.

In addition, in the method of hanging and passing the connecting tube, it is necessary to excavate the ground between both shield excavators before protruding the connecting tube.
If the ground is extremely unstable, it cannot be carried out by itself, and there is a problem in that it may be necessary to use freezing methods or chemical injection in combination.

The present invention has been developed in consideration of the problems of various conventional construction methods as described above.
The purpose of this invention is to provide an underground docking method for shield tunnels that allows for quick and safe 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 that can be driven and has a cutter bit protruding from the tip thereof is provided, and the tip of the shield cylinder of the other shield tunnel is shaped to fit into the docking seal cylinder. After approaching the two shield cylinders to face each other, a solidifying agent is injected into the outer periphery of the tip of the other shield cylinder to solidify the ground, and the docking seal cylinder is rotated from the one side shield excavator to dig into the ground. The purpose of this method is to move the shield machine forward while cutting it, move its tip forward while cutting the ground around the outer periphery of the tip of the shield cylinder of the other shield machine, and then excavate between both shield machines and make them communicate with each other.

(Function) The construction method of the present invention aligns the axes of both shield tunneling machines, brings them close to each other, and moves the docking seals on one side forward while rotating, thereby creating a cylinder with the thickness between the docking seals. A mold groove is cut and the seal strip is advanced within it. When the tip of the seal cylinder reaches the outer periphery of the tip of the opposing shield excavator, a gap is passed between the docking seals between the two shields, and the rock on the outside is prevented from collapsing.

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

1 to 3 show a one-sided shield excavator A 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.

A partition wall 14 is provided inside the tip of the shield f110 to block the front and back, and the front side thereof is connected to the excavation and kneading chamber 15.
It is said that

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

At the tip of the cutter shaft 17, four cutter spokes 18, 18, .
9 has a kneading bit 2o protruding from the rear side, and a copy cutter 21 is provided at the tip so as to be freely removable in the axial direction, and a hydraulic cylinder inside the cutter spoke 18 as shown in FIG. 22 for entry and exit operations.

The rear end of the cutter shaft 17 is rotatably and immovably connected to the drive frame 23, and is rotatably 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 WJIO, 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 frJ30 is installed on the outer periphery of the tip of the shield tube 10 so as to be movable and rotatable in the forward extension direction of the shield f@10.

When the docking seal tube 30 is in the most retracted position, its tip protrudes longer than the tip of the shield tube 10, and a cutting bit 31 is fixed to the circumferential surface of the tip. Also, on the inner surface of the dotting seal cylinder 30, there are recesses for engaging cutter spokes in at least two axially symmetrical locations.
1!32.32... are molded in plural at intervals in the axial direction as shown in FIG. Then, by pulling the cutter spoke 18 into the dotting seal tube 30 and protruding the copy cutter 21 with the tip facing the groove 32, the tip of the copy cutter 21 is engaged in the groove 32, By operating the cutter spoke 18 in this state, the docking seal cylinder 30 is also operated.

Next, a shield tunnel docking method using the shield tunneling machine configured as described above on one side will be explained.

As shown in FIG. 4(a), one shield excavator 1 mA and the other shield excavator B are caused to excavate in opposite directions from both ends of the tunnel to be excavated. Shield excavator B is the same as the shield excavator A described above, except that the shield [10] is extended to the tip side to form an excavation and kneading chamber 15 instead of the docking seal fi30.
Use one with the same structure as . However, this shield digging 1
1B uses a shield tube 10 whose outer diameter at least at the tip is smaller than the aforementioned docking seal tube 30.

In addition, in the figure, the same components of both shield excavations fiA and B are given the same reference numerals, and the explanation thereof will be omitted.

Both shield tunneling machines A and B are excavated together to sequentially excavate and form shield tunnels a and b.

At this time, the shield excavator A excavates the docking seal tube 30 as a part of the shield tube 10 without rotating it with the docking seal tube 30 in the most retracted state as shown in FIG. 4(A). Then, a course is prepared underground, and both shields frJlo, 10 are brought close to each other at a predetermined position with their axes aligned. Then, the excavation is stopped with the ground 35 remaining between the two.

Next, a liquid solidifying agent is injected into the ground around the outer periphery of the tip of the shield cylinder 1o of the shield excavation 11B using the injection nozzle 33 to solidify a part of the ground. The shield excavator A draws the cutter spoke 18 into the tip of the docking seal fi30, makes the copy cutter 21 protrude with the tip opposed to the groove 32, and inserts the tip into the groove 32. In this state, the cutter spoke 18 is rotated and moved forward. As a result, the docking seal fi30 rotates as shown in FIG. 4(b), and moves forward while cutting the earth into a cylindrical shape in the cutting pit. 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.

By repeating this, the docking seal cylinder 30 is moved forward, and its tip reaches outside the outer periphery of the tip of the shield FjlO of the other shield excavation 1NB, as shown in FIG. 4 (c).
The solidified portion 36 on the outer periphery of the tip of the shield tube, which has been solidified by injecting the solidifying agent, is cut off, and the tip is fitted into the cut groove.

In this way, the docking seal tube 30 is dug into both seals 1! i After passing the hook between the tips of the shield cylinders A and B, rotate one of the cutter spores 18 to excavate the remaining unexcavated area, then remove the cutter spokes and cutter frames such as bulkheads, and excavate tunnels a and b. communicate,
Both shield filo.

10 and the seal cylinder 30 for docking are left, and a lining is constructed inside them.

(Effects of the Invention) As described above, the shield tunnel docking method of the present invention rotates and advances a docking seal tube equipped with a cutting bit at the tip from the outer periphery of the shield tunnel of one of the shield excavators, thereby cutting the ground. While cutting it into a cylindrical shape, extend it to the outer periphery of the tip of the other shield excavator, first cut off the part solidified by the solidifying agent, and after passing the docking seal cylinder between both shield cylinders, leave it inside. By excavating the underground ground, the solidifying chemical only needs to be injected into a small part of the outer periphery of the tip of the other shield cylinder. It was decided that they would be completely connected with the peaks remaining, and the docking work would be done quickly and safely 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 the 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 (
A) to (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
...Judge, 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 ... Cylinder 23 ...
Frame, 24...Hydraulic motor 25...
Hydraulic cylinder 26... Excavated soil discharge device, 3o Old... Seal simple, 31... Cutting bit, 32... Concave groove, 33... Solidification Agent injection nozzle, 34... River...
Gap, 35...ground.

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. The tip of the shield tube is shaped to fit into the docking seal tube, and after both the shield excavators are brought close to each other in a facing arrangement, a solidifying agent is injected into the outer periphery of the tip of the other shield tube to dig the ground. The docking seal tube is rotated from the shield excavator on one side and moved forward while cutting underground, and its tip is used to cut the ground around the outer periphery of the tip of the shield tube of the other shield excavator. This is an underground docking method for shield tunnels, which is characterized by moving the shield tunnel forward, then excavating between both shield tunneling machines and making them communicate with each other.