JPH0739997Y2 - Backfill material injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention backfills a gap (tail void portion) formed between an inner wall of a tunnel excavated by a shield machine and an outer wall of a segment covering the tunnel. The present invention relates to a backfill material injection device for injecting a backfill material, and more particularly to an improvement of a backfill material injection pipe for ejecting the backfill material into the tail void portion.

[Prior Art] Generally, a gap, that is, a tail void portion is formed between an inner peripheral wall of a tunnel formed behind the shield machine and an outer peripheral wall of a segment assembled along the tunnel. A backfill material injection device that injects cement as a backfill material into the tail void portion in order to prevent inflow of surrounding sediment water into the tail void portion, prevent ground subsidence, and hold the segment stably is already known. . The backfill material injection device projects a metal tube body called a backfill material injection tube having a nozzle at the tip into the tail void portion and ejects the backfill material from the backfill material ejection port.

By the way, when the injection of the backfill material is stopped by stopping or interrupting the excavation of the shield machine, the backfill material remains in the backfill material injection pipe. If the residual backing material is hardened and the backing material injection pipe is clogged, the efficiency of injecting the backing material deteriorates. Therefore, conventionally, after the injection of the backfill material is stopped, water is sent into the backfill material injection pipe to discharge the backfill material to clean the inside of the pipe.

[Problems to be Solved by the Invention] However, since the cement used for the backfill material has strong adhesion to metal, it may not be completely removed even after the above-mentioned washing. If the cement remaining in the pipe after the cleaning hardens and is laminated on the inner wall of the pipe, the backfill material injection pipe will eventually be blocked and continuous use cannot be performed. When cleaning the clogged backfill material injection pipe, it must be disassembled, which takes time and labor, and the injection work is intermittent, resulting in very poor workability.

An object of the present invention is to provide a backfill material injection device which can prevent clogging of the backfill material injection pipe and has good workability.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a backing material injection pipe for injecting a backing material into a tail void portion on the outer periphery of a rear part of a shield frame, and cleaning water for the backing material injection pipe. And the cleaning water supply pipe for supplying the water are arranged side by side with the openings of the respective pipes positioned on the side of the tail void, and the openings of the backing material injection pipe and the openings of the backing material injection pipe Is provided in the tail void portion, and a switching means for switching between a cleaning state in which the opening of the backfill material injection pipe is connected to the opening of the wash water supply pipe is provided, and the inner peripheral wall of the backfill material injection pipe is provided. The backing material adhesion preventing layer made of urethane resin is formed.

[Operation] According to the above configuration, since the backing material adhesion prevention layer made of urethane resin is formed on the inner peripheral wall of the backing material injection pipe, the backing material adhesion prevention layer in the backing material injection pipe is adhered to the backing material adhesion prevention layer. The insert material is easily peeled off during cleaning. That is, the backing material adhesion preventing layer does not prevent the backing material from adhering to the backing material adhesion preventing layer at the time of injecting the backing material into the tail void portion, but at this time the backing material adheres. However, the characteristics of the urethane resin, which has a small affinity with the backing material (cement-based) and has good repellency at the time of cleaning, promotes the peeling of the attached backing material. This effectively prevents clogging of the backfill material injection pipe.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 2, a tail void formed on the rear outer periphery (upper part in the figure) of the shield frame 1 between the inner peripheral wall of the tunnel and the outer peripheral wall of the segment 2 assembled along the rear of the shield machine. The part 3 is provided with a backfill material injection device 4 for injecting a backfill material (cement). The backing material injecting device 4 is a hollow device body formed by welding a half-cylindrical cover 5 on the shield frame 1 and fixing the cover 5 along the axial direction of the shield frame 1 so as to be elongated and sealed from the outside. Have six. Device body 6
The backing material injection pipe 7 is provided inside so that the tip portion 7a thereof faces the tail void portion 3 direction from the tip portion 6a (right side in FIG. 2) of the apparatus body 6.

A nozzle 8 for injecting the backfill material into the tail void portion 3 is formed at the tip of the backfill material injection pipe 7. Nozzle 8
Is composed of a substantially bottomed cylindrical piston member having an opening / closing valve function at its tip, and is slidably fitted to the outer periphery of the backfill material injection pipe 7 main body and inside the cylinder portion 9 formed in the device main body 6. It is slidably fitted into the device main body 6 so as to be retractable in the axial direction. Closed tip 8a of nozzle 8
As shown in FIGS. 2 to 3, there is formed a backing material ejection port 10 which opens obliquely downward. As shown in FIG.
A backing material adhesion prevention layer 12 is formed on the inner wall 7a of the backing material injection pipe 7 so as to cover it. Backing material adhesion prevention material layer
12 is formed by coating the inner wall 7a of the backing material injection pipe 7 with a urethane resin with a thickness of about 1 mm, and the surface is formed smoothly to prevent the backing material from adhering to the inner wall 7a of the injection pipe 7. You can do it. A rubber supply hose 17 connected to a backfill material supply source (not shown) is connected to the base end portion 7b of the backfill material injection pipe 7.

On the other hand, in the cylinder portion 9 formed at the tip portion 6a of the apparatus main body 6, as shown in FIG.
A wash water supply port 11 communicating with is formed. The cleaning water supply port 11 is closed by the side wall portion 8b of the nozzle 8 when the nozzle 8 is projected so that the communication with the ejection port 10 of the nozzle 8 is blocked. A wash water supply pipe 13 for supplying wash water to the wash water supply port 11 is connected to the wash water supply port 11. A rubber supply hose 19 connected to a water supply source (not shown) is connected to the base end of the wash water supply pipe 13.

The base end portion 8c of the nozzle 8 is connected to one end of an inner frame 14 having an arcuate cross section along the inner wall of the cover 5 and slidably supported in the apparatus body 6 along its axial direction. A hydraulic cylinder 15 provided in the main body 6b of the apparatus is connected to the other end of the inner frame 14 via a connecting tool 16. Therefore, the nozzle 8 is operated by the hydraulic cylinder 15 through the inner frame 14 so as to emerge from the tip portion 6a of the apparatus main body 6, and at the time of the projection, the ejection port 10 is released to the tail void portion 3 and the ejection port 10a. 10 and wash water supply port
Communication with 11 will be cut off. That is, the nozzle 8 is in an injection state in which the jet outlet (opening portion) 10 of the backfill material injection pipe 7 is opened to the tail void portion 3, and the jet outlet (opening portion) 10 of the backfill material injection pipe 7 is supplied with cleaning water. It corresponds to the switching means in the scope of claims for utility model switching for switching between the cleaning state connected to the supply port (opening) 11 of the pipe 13.

In the backfill material injection pipe 7 and the wash water supply pipe 13, the backfill material injection pipe 7 is supported by the inner frame 14, and the wash water supply pipe 13 is supported by the inner bottom portion of the device body 6 in the axial direction of the device body 6. And is guided to the inside of the shield frame 1 through the supply hoses 17 and 19 from the opening 18 formed at the bottom of the rear portion of the apparatus body 6. In order to discharge the cleaning water supplied from the backing material introduction port 20a for introducing the backing material and the jet port 10 of the nozzle 8 into the supply side opening end 17a of the supply hose 17 on the backing material supply pipe 7 side. The switching valve 20 including a three-way valve having the cleaning water discharge port 20b is connected to the cleaning water inlet port for introducing the cleaning water into the supply side opening end of the supply hose 19 on the cleaning water supply pipe 13 side. An on-off valve 21 having 21a is connected.

Next, the operation of this embodiment will be described.

The backing agent supply device is operated following the excavation of the shield machine. When performing the operation, first, the backing material introduction port 20a of the switching valve 20 is connected to the backing material supply source, and the cleaning water discharge port 20b is connected to the discharge part. Further, the wash water inlet 21a of the opening / closing valve 21 is connected to a water supply source. In this case, the switching valve 20 and the open / close valve 21 are closed. Then, the tip portion 8a of the nozzle 8 is moved by the hydraulic cylinder 15 via the inner frame 14.
Is pushed out from the retracted position in the cylinder portion 9 formed at the tip portion 6a of the apparatus main body 6, and the nozzle 8 is set at the protruding position where the ejection port 10 thereof opens to the tail void portion 3 as shown by the chain double-dashed line in FIG. . When the shield machine starts to excavate, the switching valve 20 is operated so that the backfill material inlet 20a opens. Then, the backfill material is supplied from the backfill material supply source to the supply hose 17 through the switching valve 20, and this backfill material reaches the inside of the nozzle 8 through the backfill material supply pipe 7, and from the jet port 10 thereof. It is injected and injected into the tail void portion 3. This allows
The back void material is automatically and continuously filled in the tail void portion 3 as the shield machine advances.

On the other hand, when the shield machine is stopped, first the switching valve
20 is operated so that the flush water discharge port 20b is opened. Then, the nozzle 8 at the protruding position is pulled by the hydraulic cylinder 15 via the inner frame 14, and the ejection port 10 is set at the retracted position where it communicates with the cleaning water supply port 11 formed in the cylinder portion 9 as shown in FIG. After that, the open / close valve 21 is operated to the open side. Then, the cleaning water is introduced from the water supply source into the supply hose 19 through the opening / closing valve 21, and the cleaning water passes through the cleaning water supply pipe 13 to reach the cleaning water supply port 11 of the cylinder portion 9,
It is supplied into the nozzle 8 from the jet port 13 communicating with this.
Then, the cleaning water supplied into the nozzle 8 passes through the inside of the backfill material injection pipe 7 and cleans the inside of the supply pipe 7 while pushing out the backfill material remaining therein, and the cleaning water discharge port 20b of the switching valve 20 Is discharged.

As described above, the backing material adhesion preventing layer 12 is formed on the inner wall 7a of the backing material injection pipe 7 to prevent the residual backing material from adhering to the inner wall 7a.
It is completely discharged outside. That is, since the backing material adhesion prevention layer 12 made of urethane resin is formed on the inner peripheral wall 7a of the backing material injection pipe 7, it adheres on the backing material adhesion prevention layer 12 in the backing material injection pipe 7 during cleaning. The backing material peels off easily. Specifically, the backing material adhesion preventing layer 12 does not prevent the backing material from adhering to the backing material adhesion preventing layer 12 at the time of injecting the backing material into the tail void portion 3, but at this time, Although the material is allowed to adhere, the characteristic of urethane resin, which has a small affinity with the backing material (cement-based) and has good repellency during cleaning, promotes the peeling of the adhered backing material. This allows
The backing material injection pipe 7 can be completely prevented from being clogged, and the injection work can be performed continuously, so workability is very good.

[Advantage of Invention] In summary, according to the present invention, the following excellent effects can be exhibited.

(1) Since the backing material adhesion preventive layer made of urethane resin having a small affinity with the backing material (cement-based) and good repellency is formed on the inner peripheral wall of the backing material injection pipe, cleaning water is put in the pipe during cleaning. With the introduction of, the residual backing material can be completely discharged.

(2) As a result, clogging of the backfill material injection pipe can be completely prevented, and the injection work can be performed continuously, so workability is very good.

[Brief description of drawings]

1 is a sectional view showing a backfill material injection pipe in an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a backfill material injection device equipped with the backfill material injection pipe of FIG. 1, and FIG. The figure is a transverse cross-sectional view of the main part of FIG. In the figure, 1 is a shield frame, 3 is a tail void portion, 7
Is a backing material injection pipe, 8 is a nozzle as a switching means, 10 is an ejection port as an opening, 11 is a cleaning water supply port as an opening, 12 is a backing material adhesion preventing layer, and 13 is a cleaning water supply pipe. Is.

Claims (1)

[Scope of utility model registration request] 1. A back-filling material injection pipe for injecting a back-filling material into a tail void portion and a cleaning water supply pipe for supplying cleaning water to the back-filling material injection pipe are provided at the outer periphery of the rear part of the shield frame. Are placed side by side on the side of the tail void part, and the backing material injection pipe and the wash water supply pipe have openings in which the opening of the back filling material injection pipe is opened to the tail void part and the back filling material injection A switching means was provided for switching between a cleaning state in which the opening of the pipe was connected to the opening of the cleaning water supply pipe, and a backing material adhesion preventing layer made of urethane resin was formed on the inner peripheral wall of the backing material injection pipe. A back-filling material injecting device characterized in that