JPH0726514B2 - Underground docking method for shield tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the underground docking of a shield tunnel in which a pair of shield excavators are made to face each other and are advanced to join the ends of the shield tunnel in the ground. Regarding construction method.

(Prior Art) Generally, in the shield construction method, there is a limit in the length of excavation by one shield machine, and when constructing a long tunnel, whether to dig a vertical shaft and replace the cutter of the machine with the limit length. , A method of excavating to the next shaft using another excavator is adopted.

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

On the other hand, when the shield tunnel is docked underground in the ground where the ground stability is low due to high water pressure, such as undersea tunnels, there is a problem that there is a high risk of flooding and rock collapse.

For this reason, as a conventional underground docking method in such ground, water around the ground around the docking portion is frozen, or a chemical solution is injected into the ground to solidify the ground so that water stops and the ground collapses. To prevent this, or one of the shield machine has a connecting cylinder that can be projected at the tip of the machine.
A method has been developed for passing between both shield machines.

(Problems to be Solved by the Invention) The above-described conventional method for freezing the ground requires a long time and a large construction cost until the completion of freezing, and the method of injecting a drug solution requires a large amount of expensive drug solution to be injected. Therefore, there is a problem that it costs a lot of money and that sufficient consolidation cannot be expected when there is a flow of groundwater.

Also, in the method of straddling the connecting cylinder, it is necessary to excavate the ground between both shield machine before projecting the connecting cylinder,
When the ground is extremely unstable, it cannot be carried out by itself, and there is a problem that it is necessary to use the freezing method and the chemical injection.

The present invention contemplates the problems of various conventional construction methods as described above,
The purpose is to provide an underground docking method for a shield tunnel that can be docked at low cost quickly and safely.

(Means for Solving the Problem) The feature of the present invention for solving the above-mentioned conventional problems is that a pair of shield excavators are excavated in directions opposite to each other, and both shield excavators are provided in the ground. In the underground docking method of a shield tunnel that allows the shield tunnel to communicate with each other, in the outer periphery of the tip end portion of the shield cylinder of one of the shield excavators of both the shield excavators, the shield cylinder can freely project in the extension direction of the tip end side and rotate. A docking seal cylinder that can be driven and has a cutter bit protruding from the tip is provided, and the shield cylinder tip of the other shield excavator is shaped to fit inside the docking shield cylinder. Of the other shield cylinder, a solidifying agent is injected into the outer circumference of the tip of the other shield cylinder to solidify the ground, and From the shield machine, rotate the docking seal cylinder to move forward while cutting the ground, and move its tip forward while cutting the ground around the tip of the shield cylinder of the other shield machine, and then both shields. Excavating between excavators and making them communicate with each other.

(Operation) In the method of the present invention, the cylinders of the thickness of the docking seal cylinder are moved by causing the shafts of both shield excavators to coincide with each other and advancing while rotating the docking seal cylinder on one side. The mold groove is cut, and the seal cylinder advances in the groove. When the tip of the seal tube reaches the outer circumference of the tip of the opposing shield machine, the docking seal tube is bridged between the two shield tubes, and the collapse of the ground on the outside is prevented.

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

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

A partition wall 14 for blocking the front and back is provided in the tip portion of the shield cylinder 10, and the front side thereof is 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 axially slidably mounted on the bearing 16.

Four cutter spokes 18, 18, ... Are radially fixed to the tip of the cutter shaft 17, and each cutter spoke 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 of the hydraulic cylinder 22 inside the cutter spokes 18 so that it can be moved in and out in the axial direction.
It is designed to move in and out.

The rear end of the cutter shaft 17 is rotatably and axially immovably connected to the drive base 23, and is rotated by a hydraulic motor 24 supported by the drive base 23. Has become.

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

Reference numeral 26 in the figure is an excavated soil discharging device.

On the outer periphery of the tip of the shield tube 10, a docking seal tube
The shield cylinder 30 is rotatably installed in the shield cylinder 10 in the forward extension direction thereof. When the docking seal cylinder 30 is at the most retracted position, the tip of the docking seal cylinder 30 projects longer than the tip of the shield cylinder 10, and the cutting bit 31 is fixed to the peripheral surface of the tip. Further, on the inner surface of the docking seal cylinder 30, a plurality of recessed grooves 32, 32 for engaging the cutter spokes are formed at least at two points of the axial center with a gap in the axial direction as shown in FIG. Has been done. Then, the cutter spokes 18 are drawn into the docking seal cylinder 30, and the copy cutter 21 is projected with the tip facing the groove 32, whereby the tip of the copy cutter 21 is engaged in the groove 32. By operating the cutter spokes 18 in this state, the docking seal cylinder 30 is also operated.

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

As shown in FIG. 4 (a), the shield machine A on one side and the shield machine B on the other side are driven in opposite directions from both end positions of the tunnel to be excavated. The shield machine B has the same structure as the shield machine A described above except that the excavation and kneading chamber 15 is configured by extending the shield cylinder 10 to the tip side instead of the docking seal cylinder 30. However, as the shield machine B, an outer diameter of at least the tip of the shield cylinder 10 is smaller than the docking seal cylinder 30 described above.

In the drawings, the same constituent parts of both shield machines A and B are designated by the same reference numerals and the description thereof will be omitted.

Both shield excavators A and B are excavated together to sequentially form shield tunnels a and b.

At this time, the shield machine A excavates as a part of the shield cylinder 10 without rotating the docking seal cylinder 30 in the most retracted state as shown in FIG. 4 (a). Then, the course is adjusted in the ground, and the shield cylinders 10 and 10 are brought close to each other at a predetermined position with the axes of the shield cylinders 10 aligned. Then, the excavation is stopped while leaving the ground 35 between them.

Next, a liquid solidifying agent is injected into the ground around the tip of the shield cylinder 10 of the shield machine B by the injection nozzle 33 to solidify a part of the ground. The shield machine A draws the cutter spokes 18 into the tips of the docking seal cylinders 30, makes the copy cutters 21 project with the tips facing the grooves 32, and inserts the tips into the grooves 32. In this state, the cutter spokes 18 are rotated and moved forward. As a result, as shown in FIG. 4B, the docking seal cylinder 30
Rotates, cutting the ground into a cylindrical shape in the cutting pit and moving forward. And hydraulic cylinder 25 for cutter spoke 18
After advancing by 1 stroke, stop and pull in the copy cutter 21, pull back the cutter spokes 18, project the copy cutter 21, change the engagement position to another concave groove 32, and move it again while rotating and moving forward. Let

Repeat this to move the docking seal tube 30 forward,
As shown in FIG. 4C, the other end of the shield cylinder 10 of the other shield machine B is moved to the outside of the outer circumference of the shield cylinder 10, and the solidified portion 36 of the outer circumference of the shield cylinder is solidified by the solidifying agent injection.
Is cut, and the tip is fitted in the cutting groove.

In this way, after the docking seal cylinder 30 is hung between the shield cylinder tips of both seal excavators A and B, one of the cutter spouts 18 is rotated to excavate the remaining unexcavated portion, and then the cutter spoke. And the cutter frame such as the partition wall are removed, the tunnels a and b are connected, and both shield cylinders 1
A lining is applied to the insides of the sealing cylinders 30 for docking, leaving 0 and 10.

(Effect of the invention) As described above, the docking method for the shield tunnel of the present invention is advanced from the outer periphery of the shield cylinder of one shield machine while rotating the docking seal cylinder provided with the cutting bit at the tip to advance the ground. While cutting into a cylindrical shape, extend to the outer circumference of the tip of the other shield machine, cut the part that was solidified with the solidifying agent first, and hang the docking seal tube between both shield tubes, then left inside Since the ground is excavated, the chemical liquid for solidification can be used by injecting it into only a small part of the outer circumference of the tip of the other shield cylinder. This means that the docking work will be completed at a low cost, quickly, and safely, since they will be completely connected while leaving the above.

[Brief description of drawings]

1 is a cross-sectional view of an example of one shield machine used in the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a partial perspective view of the inner surface of a docking seal cylinder. 4A to 4C are cross-sectional views of the docking work process. A, B …… Shield excavator, a, b …… Shield tunnel, 11 …… Segment assembly device, 12 …… Liner wall, 13 …… Jack, 14 …… Differential partition, 15 …… Drilling and mixing chamber, 16… … Bearing, 17 …… Cutter shaft, 18 …… Cutter spokes, 19 …… Cutter bit, 20 …… Kneading bit, 21 …… Copy cutter, 22 …… Cylinder, 23 …… Mount, 24 …… Hydraulic motor, 25 …… hydraulic cylinder, 26 …… excavated soil discharging device, 30 …… seal tube, 31 …… cutting bit, 32 …… concave groove, 33 …… solidifying agent injection nozzle, 34 …… gap, 35 …… solid ground .

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masahiro Tsujiguchi 2-8 Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Hiroshi Saeki 2-2-8 Koraku, Bunkyo-ku, Tokyo No. 5 In Yoyo Construction Co., Ltd. (72) Inventor Ken Ogasa 2-8, Koraku, Bunkyo-ku, Tokyo Within Yoyo Construction Co., Ltd. (72) Kazuto Hamada 2-chome, Koraku, Bunkyo-ku, Tokyo No. 8 in Goyo Construction Co., Ltd. (56) Reference JP-A-64-43696 (JP, A) JP-A-63-47499 (JP, A) JP-A-1-278691 (JP, A)

Claims (1)

[Claims] 1. A ground tunnel docking method of a shield tunnel in which a pair of shield excavators are dug in directions facing each other so that the shield tunnels of the shield excavators communicate with each other in the ground. On the outer periphery of the tip portion of the shield tube of the shield machine, a docking shield tube is provided which can project in the extension direction of the tip side of the shield tube and can be rotationally driven, and has a cutter bit protruding from the tip. The shield cylinder tip of the shield machine is formed into a shape that fits in the docking seal cylinder, and after bringing both shield machine closer to the facing arrangement, a solidifying agent is applied to the outer periphery of the tip of the other shield cylinder. Inject it to solidify the ground, and rotate the docking seal tube from the shield excavator on the one side to cut the ground. The ground of the shield tunnel is characterized in that after moving forward, the tip is advanced while cutting the ground around the outer periphery of the seal cylinder of the other shield machine, and then excavating between the shield machine and communicating with each other. Medium docking method.