JP6162292B2 - Backing material injection device - Google Patents

Description

The present invention relates to a backing write material injection device that put the shield tunneling.

Conventionally, in excavation by a shield machine, a backing material is filled in an annular gap (tail void) between an inner peripheral surface of a drilling hole excavated by a cutter at the tip thereof and an outer peripheral surface of a segment to be installed, We try to prevent problems such as intrusion into the spring water segment and land subsidence.
As a method of injecting the backing material, a simultaneous backing material injection method in which the backing material is injected almost simultaneously with the generation of the tail void, and a backing material injection of the segment located at a position behind the rear body of the shield machine There is known an immediate back material injection method for injecting a back material from a hole.
In particular, the simultaneous backing material injection method does not require desorption work of the injection nozzle into the backing material injection hole every time it progresses, so it improves work efficiency and reduces the cost of tunnel construction compared to the immediate backing material injection method. It is advantageous in planning.

JP 2010-59607 A JP 2000-170495 A

On the other hand, the simultaneous backing material injection method has a structure in which the backing material injection part of the backing material injection device is attached to the outer peripheral surface of the rear body part of the shield machine, and after the backing material injection part is attached The portion of the body portion protrudes outward in the radial direction of the rear body portion.
For this reason, there is no problem when excavating soft ground, but when it is necessary to advance to hard ground such as rock during the excavation, the backfill material injection part hits the inner periphery of the excavated hole and There is a problem that the excavation by the shield machine cannot be performed smoothly because the material injection part is damaged.
The present invention has been devised in view of the above circumstances, and an object of the present invention is that a shield machine in which a backing material injection portion is attached to the outer peripheral surface of a rear trunk portion proceeds from a soft ground to a hard ground. even if is to provide an advantageous backing write material injection apparatus on the smooth progress of the shield machine.

The present invention for achieving the objects,-edge cutter is arranged shield machine after barrel first co Urakomi material injection method for implementation of injecting Urakomi material to attached Teruboido the outer peripheral surface of the A back material injecting section, a back material supplying section for supplying a back material to the first back material injecting section via a pipe disposed inside the rear body of the shield machine, and the back body section In the backing material injecting device for a shield machine provided with a piping insertion hole for inserting the piping into and out of the rear trunk portion, the first backing material injecting portion is formed on an outer peripheral surface of the rear trunk portion. It is detachably attached by an operation from the inner peripheral surface of the rear trunk portion , and is connected to the backing material supply unit when the soft ground is dug through the pipe , and the backing material supply unit when the hard ground is dug. disconnected from, the split can configured the pipe from the middle in the longitudinal direction Is, the pipe insertion hole, the said the rear trunk portion in the first Urakomi member is connected to the injection unit the shed the pipe portion radially outwardly extrudable size of the rear body portion of the A cover plate that is formed so as to penetrate in the radial direction and closes the pipe insertion hole by an operation from the inner peripheral surface of the rear trunk portion is provided, and the back material is supplied to the rear trunk portion when the hard ground is dug. And a second backing material injecting unit for carrying out the immediate backing material injecting method, which is connected to the part and separated from the backing material supply unit when the soft ground is dug .

According to the present invention, when digging a soft ground with a shield machine, the backing material supply unit of the backing material injection device is disposed inside the rear trunk portion, and the first backing material is disposed on the outer peripheral surface of the rear trunk portion. The injection part is arranged, and the backing material is injected from the first backing material injection part almost simultaneously with the generation of the tail void.
If it is necessary to advance from soft ground to hard ground such as rock during the excavation, the connection between the first backing material injection part and the rear torso is released, and the segment away from the rear torso The second backing material injection portion is pierced while being injected into the tail void through the backing material injection hole, and the first backing material injection portion is left in the tail void.
Therefore, when excavating a hard rock mass, there is no protrusion on the outer peripheral surface of the rear trunk, and the excavation by the shield method is performed smoothly.

(A) is a side view of a state in which the shield machine is digging while performing the simultaneous backing material injection method, and (B) is a view of the shield machine from the rear of the rear trunk. It is explanatory drawing which removed the 1st back material injection | pouring part from the back trunk | drum, and obstruct | occluded the piping insertion hole with the cover plate. It is explanatory drawing which a shield machine advances while performing the immediate backing material injection | pouring method, and leaves the 1st backing material injection | pouring part in a tail void. It is a side view of the state where the shield machine is digging while performing the immediate back material injection method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the shield machine 10 includes a front body portion 12 having a cutter 1202 at the front end, and a rear body portion 14 connected to the front body portion 12 so as to be bent.
A motor for rotating the cutter 1202 and a conveyor device for discharging excavated earth and sand are arranged inside the front trunk portion 12, and an erector for assembling the segment C and a jack for excavation are arranged inside the rear trunk portion 14. Is arranged.
The segment C is provided with a backing material injection hole regardless of whether or not it is used, and the backing material injection hole is closed with a stopper.
Further, a wire brush 16 is provided on the inner peripheral surface of the rear end of the rear trunk portion 14.
The wire brush 16 holds the inside of the rear trunk portion 14 in a watertight manner against the tail void 20 that is an annular space between the inner peripheral surface of the excavation hole 18 and the outer peripheral surface of the segment C. Intrusion into the portion 14 is prevented.

The backing material injecting device 22 fills the tail void 20 with the backing material, and prevents intrusion into the segment C of the spring water or ground subsidence.
The backing material injection device 22 includes a backing material supply unit 24, a first backing material injection unit 26 for performing a simultaneous backing material injection method that can be connected to and separated from the backing material supply unit 26, and FIGS. 4 is provided with a second backing material injecting section 36 that can be connected and separated to the backing material supply section 26 shown in FIG.
As the backing material, various conventionally known materials such as a material in which materials are mixed in advance such as mortar and a material in which a curing agent is mixed with a main agent immediately before injection can be used.
In addition, the first backing material injection section 26 can employ injection sections of various configurations for carrying out a conventionally known simultaneous backing material injection method corresponding to the backing material.
Furthermore, as the second backing material injecting section 36, various configurations of injecting sections for implementing a conventionally known immediate backing material injecting method corresponding to the backing material can be employed.

The first backing material injection portion 26 is attached to the outer peripheral surface of the upper portion of the rear trunk portion 14 and discharges the backing material toward the tail void 20. In FIG. 1B, reference numeral 2610 indicates that the backing material is discharged. The discharge port to be used is shown.
The first backing material injecting portion 26 has a frame 2602 having an injecting path for the backing material, and the frame 2602 is detachable from the inner peripheral surface of the rear trunk portion 14 by a bolt 2604. It is attached to the surface and is configured to be removable from the inside of the rear trunk portion 14. In addition to the bolt coupling, various conventionally known coupling structures can be adopted as the structure for detachably attaching the first backing material injection section 26 to the rear trunk section 14.

The backing material supply unit 24 is disposed inside the rear trunk unit 14.
The backing material supply unit 24 includes a backing material storage tank 2402, a pipe 2404 that connects the containing tank 2402 and the first backing material injection unit 26, and a backing material in the housing tank 2402 through the pipe 2404. Pump 2406 pumped to the injection path of the first backing material injection unit 26, cleaning water tank 2408 for cleaning the piping 2404 and the injection path, and the cleaning water in this tank 2408 are used as the first backing material A pump 2410 and a pipe 2412 that are pumped to the injection unit 26 are included.

The piping 2404 for the backing material and the piping 2412 for the washing water are disposed inside and outside the rear trunk portion 14 via the pipe insertion hole 1402 of the rear trunk portion 14, and the periphery of the pipe insertion hole 1402 is a frame 2602. It is covered with a cover 2606 attached.
Portions in the longitudinal direction of these pipes 2404 and 2412 are connected through a joint 30 so as to be separable. More specifically, the locations of those pipes in the vicinity of the pipe insertion hole 1402 are connected to the backing material supply unit 24 side and the first through the ball valve (open / close valve) 32, the joint 30, and the ball valve (open / close valve) 33. It is connected to the back material injection part 26 side of the severable portion.

Next, a backing material injection method using the backing material injection device 22 will be described.
As shown in FIG. 1, when digging a soft ground with the shield machine 10, the backing material supply unit 24 of the backing material injection device 22 is arranged inside the rear trunk portion 14, and the outer circumferential surface of the rear trunk portion 14 is arranged. The first backing material injection section 26 is arranged, and the backing material supply section 24 and the first backing material injection section 26 are connected by the backing material pipe 2404 and the washing water piping 2412, and the tail void 20 At the same time as the generation, the simultaneous backing material injection method of injecting the backing material from the first backing material injection unit 26 is performed.

When it is necessary to advance from soft ground to hard ground such as rock during the excavation, the pump 2406 is stopped and injection of the backing material from the first backing material injection portion 26 to the tail void 20 is stopped.
Further, as shown in FIG. 2, the ball valves 32 and 33 are closed, the pipes 2404 and 2412 connected from the joint 30 to the first backing material injection part 26 side are cut off, and the pipes are inserted from the pipe insertion holes 1402. The portions 2404 and 2412 are pushed to the outside of the rear trunk portion 14, and the pipe insertion hole 1402 is closed with the lid plate 34 via the bolt 3402.
Further, the bolt 2604 is removed inside the rear body portion 14 to release the connection between the frame 2602 and the rear body portion 14 of the first backing material injection portion 26, and the rear body portion 14 in which the bolt 2604 has been inserted is removed. The bolt insertion hole is also closed with a stopper or the like.

Further, the tip portions of the pipes 2604 and 2412 are connected to the ball valve 33 of the second backing material injection unit 32 through the joint 34, and the backing material supply unit 26 and the second backing material injection unit 36 are connected. Connecting.
And the plug of the backing material injection hole of the segment C corresponding to the location where the backing material is not injected is removed, and the second backing material injection part 36 and the backing material injection hole of the segment C are connected.
In this case, the phase of the backing material injection hole into which the backing material is injected is shifted in the circumferential direction of the segment C from the location where the first backing material injection portion 26 is attached in the circumferential direction of the segment C. The use of the part is advantageous for smoothly injecting the backing material into the tail void 20.

Then, as shown in FIGS. 3 and 4, the tail void 20 from the second backing material injection portion 36 is now passed through the backing material injection hole of the segment C, which is away from the rear trunk portion 14 while digging. Immediate backfill material injection method is performed to inject the back material.
As the shield machine 10 is dug, the first backing material injection section 26 hits the inner periphery of a hard ground such as a rock, and the first backing material injection section 26 stays in that place.
That is, the shield machine 10 leaves the first backing material injection part 26 in the tail void 20, and the pipes 2404 and 2412 connected to the first backing material injection part 26 side also become the tail void 20. I leave behind and dig.
Therefore, when excavating a hard rock mass, there is no protrusion on the outer peripheral surface of the rear trunk portion 14, and the excavation by the shield method is smoothly performed.

  DESCRIPTION OF SYMBOLS 10 ... Shield machine, 12 ... Front trunk | drum, 14 ... Rear trunk | drum, 1402 ... Pipe insertion hole, C ... Segment, 20 ... Tail void, 22 ... Backing material injection apparatus, 24 ... Back Filling material supply section, 2402 ... Backing material storage tank, 2404 ... Backing material piping, 2406 ... Backing material pump, 2408 ... Washing water tank, 2410 ... Washing water pump, 2412 ... ... pipe for cleaning water, 26 ... backing material injection part, C ... segment.

Claims (3)

A first backing material injecting unit for carrying out a simultaneous backing material injection method that is attached to the outer peripheral surface of the rear body portion of the shield machine with a cutter disposed at the tip and injects the backing material into the tail void;
A backing material supply unit that is arranged inside the rear trunk portion of the shield machine and supplies a backing material to the first backing material injection unit via a pipe;
A pipe insertion hole that is provided in the rear trunk section and allows the pipe to be inserted into and out of the rear trunk section;
In the backing material injection device of a shield machine comprising:
The first backing material injecting portion is detachably attached to the outer peripheral surface of the rear trunk portion by an operation from the inner peripheral surface of the rear trunk portion , and when the soft ground is dug through the pipe Connected to the backing material supply unit and separated from the backing material supply unit when digging the hard ground,
The piping is configured to be capable of being divided from the middle in the longitudinal direction,
The pipe insertion hole is connected to the first backing material injecting portion and is sized so that the divided pipe portion can be pushed outward in the radial direction of the rear trunk portion. Formed through the
A lid plate that closes the pipe insertion hole by an operation from the inner peripheral surface of the rear trunk portion is provided,
Second backing material injection for carrying out an immediate backing material injection method that is connected to the backing material supply unit when excavating a hard ground and is disconnected from the backing material supply unit when excavating a soft ground. Has a part,
Backing material injection device characterized by that. The part of the pipe on the side of the divided backing material supply part can be connected to the second backing material injection part,
The backing material injecting device according to claim 1 . The Urakomi material injection hole of the segment injection Urakomi material is carried out in the Teruboido from second Urakomi material injection portion, said first Urakomizai that has been attached removably to the rear barrel The phase is shifted in the circumferential direction of the segment and the injection portion,
The backing material injecting device according to claim 1 or 2 , wherein

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