JPH076346B2 - Underground docking method for shield tunnel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underground docking method of a shield tunnel for connecting a side tunnel to a railway or road tunnel or a branch tunnel to a sewer tunnel.

(Prior Art) Conventionally, when docking a new tunnel with a shield machine to the previously constructed tunnel,
As shown in Fig. (A), the shield machine 2 stops excavating before contacting the existing tunnel 1, the excavation frame 3 of the shield machine 2 is removed, and the unexcavated part a between both tunnels 1 and 4 is handed. Excavation was performed by excavation, and the existing tunnel 1 and the new tunnel 4 were connected as shown in FIG. In addition, a ground hardening agent such as cement milk has been injected in advance around the unexcavated portion a in order to prevent the ground in the hand-digged portion from collapsing and the water from flowing out.

(Problems to be Solved by the Invention) In the above-mentioned conventional method, there is a problem that the effect of the ground hardening agent cannot be expected so much in the case of sandy ground or the ground having a lot of groundwater, and the effect of the ground hardening agent is It is to excavate the hardened ground even if it is sufficiently obtained.
Moreover, since the excavation is a manual work, there is a problem that the work efficiency is low and the danger is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems as described above, and an object thereof is to provide an underground docking method for a shield tunnel, which enables complete and efficient excavation of a docking portion using a shield machine.

(Means for Achieving the Problem) The feature of the underground docking method of the shield tunnel of the present invention for solving the conventional problems as described above and achieving the initial object is that the shield having the cylindrical shape of the shield machine is used. At the tip of the cylinder, there is provided a docking seal tube that is capable of projecting in the extension direction of the shield tube at the tip side and is rotationally driven, and a cutter bit is provided on the tip peripheral surface of the seal tube. The purpose is to cut the lining wall of the existing tunnel and dock the new tunnel by moving it forward while rotating it.

(Operation) This underground docking method stops the excavation of the shield machine at a position close to the existing tunnel, and advances it while rotating the seal cylinder at the tip of the shield cylinder to simultaneously excavate the ground of the docking part in a tubular shape. , Cut the lining wall of the existing tunnel into a ring shape. As a result, the tip of the shield cylinder and the existing tunnel are connected through the seal cylinder.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

1 to 3 show a shield excavator used in the present invention. In the figure, 10 is a cylindrical shield cylinder, 11 is a segment assembling device, 12 is a lining wall by segment, 13 is a shield cylinder by applying reaction force to the lining wall.
It is a jack that pushes out 10.

A partition wall 14 is provided at the tip of the shield cylinder 10 to block the front and back, 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 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 docking method using the shield machine configured as described above will be described.

As shown in FIG. 4 (a), the docking seal cylinder 30 is advanced in the most retracted state, and when the approaching tunnel 1 is approached, the shield cylinder 10 is stopped from moving forward, and as shown in FIG. 4 (b). Seal cylinder for docking cutter spokes 18 as shown
The copy cutter (21) is pulled into the tip of the groove (30), the tip is opposed to the groove (32) and the copy cutter (21) is projected, and the tip is inserted into the groove (32). In this state, the cutter spokes 18 are rotated and moved forward. As a result, the docking seal cylinder 30 moves forward while rotating, as shown in FIG. And
After moving the hydraulic cylinder 25 for the cutter spoke 18 forward by 1 stroke, stop it and pull in the copy cutter 21, pull back the cutter spoke 18, and then copy cutter 21.
Is projected to change the engagement position to another concave groove 32, and is driven again while being rotationally driven again.

Repeat this to move the docking seal tube 30 forward,
As shown in FIG. 4 (d), the unexcavated portion a of the connecting portion and the lining 5 of the existing tunnel 1 are cut into a tubular shape, and the docking seal tube 30 is provided between the existing tunnel 1 and the shield tube 10. Cross over. After burning, remove the cutter frame such as cutter spokes and bulkheads, remove the earth and sand in the docking seal tube 30 and the cut lining wall 5a,
Connect both tunnels 1 and 3.

(Effects of the Invention) As described above, the underground docking method for a shield tunnel of the present invention extends while rotating the docking seal tube from the shield tube, and the unexcavated part and the lining wall of the existing tunnel are extended at the tip thereof. In addition to cutting, the shield cylinder and the existing tunnel were made to communicate with each other via the docking seal cylinder, so excavation was carried out in the state where the ground collapse was completely prevented without using the ground hardening agent as in the past. As a result, you can work efficiently and safely in a short time.

[Brief description of drawings]

1 is a cross-sectional view of an example of a shield machine used in the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a partial perspective view of the inner surface of a docking seal cylinder, Figure 4 (a)
(D) is a cross-sectional view of the docking work process, FIG.
(B) is a sectional view showing a process of a conventional example. a: unexcavated part, 1 ... existing tunnel, 4 ... new tunnel, 10 ... shield tube, 11 ... segment assembly device, 12 ... lining wall, 13 ... jack, 14 ... bulkhead, 15 …
… Excavation and kneading chamber, 16 …… Bearing, 17 …… Cutter shaft, 18 …… Cutter spoke, 19 …… Cutter bit,
20 …… Kneading bit, 21 …… Copy cutter, 22 …… Cylinder, 23 …… Mounting stand, 24 …… Hydraulic motor, 25 …… Hydraulic cylinder, 26 …… Excavation soil discharging device, 30 …… Seal cylinder, 31 …… Cutting bit, 32 …… Concave groove.

Front page continuation (72) Inventor Tetsuo Furuta 2-8, Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. (72) Ken Ogasa 2-2-8, Koraku, Bunkyo-ku, Tokyo Goyoken Incorporated Co., Ltd. (72) Inventor Toshinori Teramoto 2-8 Koraku, Bunkyo-ku, Tokyo In Goyoken Co., Ltd. (56) Reference JP 59-15189 (JP, A) JP 63- 255497 (JP, A)

Claims (1)

[Claims] 1. A docking seal cylinder, which is rotatable and driven, is provided at the tip end of a cylindrical shield cylinder of a shield machine, and which is rotatable in the extension direction of the shield cylinder. A underground tunnel docking method for a shield tunnel characterized in that a cutter bit is provided on the tip peripheral surface, and the sealing cylinder is moved forward while being rotationally driven to cut the lining wall of the existing tunnel to dock the new tunnel. .