JPH04309697A - Shield tunnel connecting method and device - Google Patents

Abstract

PURPOSE:To obtain a shield tunnel connecting method and device in which the branch pipe connection reaching accuracy is sufficient, soil discharging process is also easy, machines to be used can be small-sized ones, and high safety can be obtained. CONSTITUTION:After advance boring with a small bore casing excavator cuts and reaches a bulkhead box 7 inside a shield tunnel, the casing part 4 of this casing excavator is made to remain as an advance pipe 8 to withdraw the excavator. In the next step, excavation is made by a bore expansion excavator for pipe burying for connecting pipes as branch pipes in order in the rear direction while driving the advance pipe holding it, and the advance pipe is made penetrate the bulkhead box, and the head sections are withdrawn in a shield tunnel 5. In addition, the earth and sand excavated by the bore expansion excavator for pipe burying are also collected in the tunnel 5 through this advance pipe, and the bore expansion excavator for pipe burying is made to reach the shield tunnel to be withdrawn, and the head of the branch pipe is connected to the shield tunnel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel connecting method for connecting a branch pipe such as a manhole pipe to a shield tunnel, and an apparatus therefor.

0002

[Prior Art] In recent years, shield construction in urban areas has been
Tunnels are being constructed in increasing numbers in various locations as they do not affect road traffic or adjacent structures, and do not cause vibration or noise. To connect manhole pipe system equipment to such a shield tunnel, STIC (Tunnel Interfaces w) is used.
A construction method called ith conuits has been developed.

[0003] In the STIC method, holes are drilled into an existing shield tunnel using a large all-casing drilling machine, and a branch steel pipe is connected to the shield tunnel. There is no unique method for drilling holes, and the pipes to be branched are directed vertically or diagonally upward toward the ground with respect to the horizontal shield tunnel. A boring machine with an all-round casing is optimal, and the ground is held using a positive circulation mud water system, and the excavated slime is treated with mud water lifting.

0004

[Problem to be solved by the invention] Such a conventional ST
In the IC method, a large hole drilling machine and oblique hole holding device are installed.
Since the hole is drilled for the shield tunnel without confirmation, it is difficult to ensure accuracy because it is a one-step drilling in deep, alternately layered soil, and it may become impossible to drill the hole due to poor soil removal or failure to hold the hole wall. many. In addition, because it requires soil removal and the installation of a large drilling machine above ground, it is subject to construction regulations such as road occupancy conditions and road usage permits.

The object of the present invention is to solve the above-mentioned disadvantages, achieve high accuracy in branch pipe connection, and simplify soil removal.
The object of the present invention is to provide a shield tunnel connection method and device that requires only small construction machinery and is highly safe.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a rotary drive shaft of a cutter head located in a leading pipe whose rear end is connected to a burying pipe, and located at the tip of the leading pipe. It is a pipe burying machine equipped with After the preliminary boring excavation with the casing excavator cuts a segment of the shield tunnel and reaches the bulkhead box inside the shield tunnel, the excavator is recovered leaving the casing part of the casing excavator as a leading pipe, and then the leading pipe is removed. The pipe is excavated using a diameter expanding excavator for burying the pipe, which is then pushed forward and connected to the pipe body as a branch pipe at the rear.The leading pipe is passed through the bulkhead box, and the leading end is sequentially recovered in the shield tunnel. At the same time, the soil excavated by the diameter expanding machine for pipe burying is also passed through this leading pipe and collected in the shield tunnel. The purpose is to connect the

[0006]

[Operation] According to the present invention, the leading pipe is first safely reached the bulkhead box in the shield tunnel, and then, as a branch pipe construction work, the leading pipe is held in with a diameter expanding machine for pipe burying.
This lead pipe is used as a slime discharge and guide pipe, so construction can be carried out accurately, efficiently and safely even at great depths.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 7 are explanatory views of each process showing one embodiment of the shield tunnel connection method of the present invention.Although illustration is omitted, assuming that an existing shield tunnel is being constructed, as shown in FIG. , a casing auger 1 with a cutter bit 3 provided at the tip of a screw shaft 2 and a casing 4 made of a steel pipe arranged on the outside of this screw shaft 2 is used as a small-diameter casing excavator, and this casing auger 1
Preliminary boring excavation is performed from the ground. Note that during this excavation, a positive circulation method is adopted in which muddy water is sent from within the screw shaft 2 and slime waste soil is collected from the upper end of the casing 4.

On the other hand, as shown in FIG. 2, a partition box 7 is attached to the skin plate 6 formed by the segments of the shield tunnel 5. This partition box 7 has a gate 7a on the lower surface and an injection port 7b on the side. The casing auger 1 perforates and cuts a segment of the shield tunnel 5, and the tip of the casing auger 1 is stopped within the bulkhead box 7. Next, water stop reinforcement injection is performed into the partition box 7 from the injection port 7b. Further, the gate 7a is opened and the cutter bit 3 of the casing auger 1 is collected inside the shield tunnel 5.

As shown in FIG. 3, the casing 4 is left in place and used as a leading pipe 8, but the screw shaft 2
is collected, the mouth packer device 9 is set at the end of the leading pipe 8 protruding from the partition box 7, and the injection hose 10 and wiring are inserted into the leading pipe 8. In addition, the injection port 7b
From there, water stop reinforcement injection is performed into the bulkhead box 7, and the leading pipe 8
Strengthen the area around the water stop.

[0010] In this embodiment, the casing auger 1 having the screw shaft 2 is used for constructing the leading pipe 8, but the present invention is not limited to this. For example, it consists of a joint pipe that fits into the tip of the casing 4 and a leading pipe that fits into the joint pipe, has a motor and drive shaft inside, and has a drilling bit at the tip, and does not have a screw shaft 2. It is also possible to use an excavator. In this case as well, a positive circulation system can be adopted in which muddy water is sent and slime waste is collected from the upper end of the casing 4.

The injection plant is installed on the ground, and as shown in FIG.
An inner pipe 11 is disposed outside, and the ground is strengthened by injecting a chemical solution from the inner pipe 11 via an injection hose 10 passing through the preceding pipe 8.

Next, as shown in FIG. 5, excavation is carried out using a diameter expanding excavator 13 for burying pipes, which holds the leading pipe 8 and pushes it forward while successively connecting pipe bodies as branch pipes 12 to the rear. FIGS. 8 to 11 show details of this diameter expanding excavator 13 for burying pipes.

The diameter expanding excavator 13 for burying a pipe has a leading pipe 1 whose rear end is fitted and connected to the tip of a branch pipe 12 serving as a pipe body for burying.
4, a drive motor 15 and a rotational drive shaft 16 are provided, and the drive motor 15 and rotational drive shaft 16 are connected to gears 17, 1.
It was connected to rotate at a deceleration speed of 8. Further, the tip of the rotary drive shaft 16 is located at the tip of the leading pipe 14, and a cutter head 19 having a digging blade 21 implanted therein is provided there.

This cutter head 19 has a through hole in the center that communicates with the hollow interior of the rotary drive shaft 16 and opens on the face surface, and this through hole is connected to the rear end holding portion 2 of the leading tube 8.
Set to 0. Note that a locking recess 2 is provided on the rear end side of the leading pipe 8.
A locking pin 23 is provided on the cutter head 19, and the tip of the locking pin 23 is inserted into the locking recess 2.
I set it to 2. Further, the cutter head 19 is provided with an opening 24 for taking in excavated earth and sand.
This opening 24 communicates with the rear end of the held leading tube 8.

When the drive motor 15 is started in the pipe burying diameter expanding excavator 13, the rotary drive shaft 16 and the cutter head 19 are rotated at a reduced speed via the gears 17 and 18.
Excavation is carried out and the branch pipe 12 is buried. At the same time, the leading pipe 8 is also rotated by the cutter head 19 and pushed into the shield tunnel 5 through the bulkhead box 7. The tip of this leading pipe 8 is appropriately cut and removed within the shield tunnel 5, but excavated soil enters the leading pipe 14 through the opening 24, passes through the leading pipe 8 from here, and is discharged into the shield tunnel 5. be done. A vessel 25 for accumulating earth and sand is placed inside the shield tunnel 5, and a valve 26 for earth discharge is provided at the tip of the leading pipe 8 so that the discharge of earth and sand into the vessel 25 can be adjusted.

When the pipe burying diameter expanding machine 13 reaches the inside of the shield tunnel 5, it is recovered, the bulkhead box 7 is removed, and the seismic socket 27 is inserted into the branch pipe 12 as shown in FIG. It is attached to the tip of the shield tunnel 5, its surroundings are reinforced with a reinforcing material, and it is connected to the shield tunnel 5. In addition, non-shrinkage mortar is poured from the ground through this branch pipe 12 for repair, and waterproofing is performed to prevent water leakage at the joints.

The construction work is now complete, but the remaining soil in the shield tunnel 5 can be discharged to the ground through the branch pipe 12, as shown in FIG.

[0018]

[Effects of the Invention] As described above, the shield tunnel connecting method and device of the present invention connects a branch pipe to an existing shield tunnel by enclosing the preceding pipe, so that the accuracy of the branch pipe reaching the branch pipe is high. Moreover, soil removal can be easily and safely carried out using this leading pipe.

Furthermore, construction can be performed directly from the above-ground pit, there is less temporary construction work, the plant equipment is more compact, the scope of work can be reduced, and the construction machinery is more compact, making it suitable for urban areas where construction can only be carried out at night. It can fully demonstrate its power even on narrow roads.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a first step showing an embodiment of the shield tunnel connection method of the present invention.

FIG. 2 is an explanatory diagram of a second step showing an embodiment of the shield tunnel connection method of the present invention.

FIG. 3 is an explanatory diagram of a third step showing one embodiment of the shield tunnel connection method of the present invention.

FIG. 4 is an explanatory diagram of a fourth step showing one embodiment of the shield tunnel connection method of the present invention.

FIG. 5 is an explanatory diagram of a fifth step showing one embodiment of the shield tunnel connection method of the present invention.

FIG. 6 is an explanatory diagram of a sixth step showing one embodiment of the shield tunnel connection method of the present invention.

FIG. 7 is an explanatory diagram of an eighth step showing one embodiment of the shield tunnel connection method of the present invention.

FIG. 8 is a longitudinal cross-sectional view showing an embodiment of a diameter expanding excavator for burying pipes as a connecting device for a shield tunnel according to the present invention.

FIG. 9 is a front view of the cutter head portion.

FIG. 10 is a cross-sectional view taken along line AA in FIG. 8;

FIG. 11 is a sectional view taken along the line BB in FIG. 8;

[Explanation of symbols]

1...Casing auger
2...Screw shaft 3...Cutter bit
4...Casing 5...Shield tunnel
6...Skin plate 7...Bulkhead box
7a...Gate 7b...Inlet
8... Leading pipe 9...
Mouth packer device
10...Injection hose 11...Inner pipe
12... Branch pipe 13... Diameter expanding machine for burying pipes 14... Leading pipe 15...
Drive motor
16...Rotation drive shaft 17, 18...Gear
19... Cutter head 20... Holding part
21...Drilling blade 22...Locking recess
23...
Locking pin 24...opening
25...Vessel 26...Valve
27...Earthquake resistant socket

Claims (2)

[Claims] Claim 1: After the preliminary boring excavation with a small-diameter casing excavator cuts a segment of the shield tunnel and reaches the bulkhead box inside the shield tunnel, the casing portion of the casing excavator is left as a preliminary pipe and the excavator The lead pipe is then excavated using a diameter expanding machine for burying pipes, which holds the lead pipe and pushes it forward while sequentially connecting the pipe body as a branch pipe to the rear. At the same time, the soil excavated by the diameter expanding machine for pipe burying is collected in the shield tunnel through this leading pipe, and the soil is recovered by the diameter expanding machine for pipe burying reaching inside the shield tunnel. A shield tunnel connection method characterized by connecting the tip of a branch pipe to a shield tunnel. 2. A pipe burying machine in which a rotary drive shaft of a cutter head located at the tip of the leading pipe is disposed in a leading pipe whose rear end is connected to a pipe body for burying, and the leading pipe is located at the center of the cutter head. A connecting device for a shield tunnel, characterized in that it is a diameter expanding excavator that is provided with a rear end holding portion and extrudes a leading pipe.