JPS621355Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides a protection tube on the outer peripheral wall of the skin plate that forms the shield body, and separately configures a backing material injection line and a water injection line for cleaning within the protection tube. Insert the switching valve body that switches the outlet of the backfilling material injection pipe open and closed into the valve hole so that it can slide in the axial direction, and when the outlet of the backfilling material injection pipe is closed, This invention relates to a shield excavator that is provided with a water guide hole that communicates with the outlet of a filling material injection pipe.

Next, an example of a backfilling material injection device for a conventional shield excavator of this type will be explained with reference to FIGS. 1 to 7.

As shown in FIGS. 1 and 2, a cutter wheel 3 rotated by a drive device 2 is supported on a bulkhead integral with the skin plate 1 forming the main body of the shield tunneling machine M. A plurality of protection tubes 4 constituting a backfilling material injection device are provided on the wall at intervals on the circumference.

As shown in FIGS. 3 and 4, a backfilling material injection pipe 5 and a water injection pipe 6 for cleaning are separately arranged in the protection tube 4. The rear end portions are connected to the inlets of an injection channel 7 and an injection channel 8 provided on the rear wall of the protection tube 4, respectively. A valve hole 9 is provided in the rear wall of the protection tube 4 between the injection channels 7 and 8, and the valve hole 9 has a switching valve body 10 for switching and sliding in the axial direction. It has been inserted. An annular groove is provided in the peripheral wall of the switching valve body 10, and a seal 11 is attached to the groove. Further, in the shaft-shaped portion of the switching valve body 10, a water guide hole 12 is provided in the diametrical direction, which connects the injection channel 8 and the injection channel 7 with the outlet of the injection channel 7 closed by the switching valve body 10. An inclined surface 10a is formed at the tip of the switching valve body 10.

A switching bar 13 integrated with the switching valve body 10
As shown in FIGS. 3 and 6, it is supported so as to be able to slide in the axial direction on a support plate 14 fixed to the skin plate 1, and its front end is attached to one end of a bell crank 15 with a pin 16. are connected by The bell crank 15 is swingably attached to a support bracket 17 fixed to the skin plate 1 with a pin 18.
The other end is supported by a pin 2 at the tip of the piston rod 19a of the hydraulic cylinder 19.
Connected by 0. By operating the hydraulic cylinder 19, the bell crank 15 is moved to the pin 1.
8 as a fulcrum, and the switching bar 13 and the switching valve body 10 move in the axial direction.

A backfilling material supply hose 21 shown in FIG. 7 is connected to the backfilling material injection pipe 5. The backfilling material supply hose 21 is connected to the discharge side of a backfilling material pump 23 via an on-off valve 22, and is also connected to a backfilling material tank 25 via an on-off valve 24 provided in parallel with the on-off valve 22. has been done. The suction of the backing material pump 23 is connected to the backing material tank 25.

The water injection pipe 6 is connected to a cleaning water supply hose 2 shown in FIG.
The cleaning water supply hose 26 is connected to the discharge side of a water pump 28 via an on-off valve 27, and the suction side of the water pump 28 is connected to a water tank 29.

3 and 6 show the state when backfilling material is injected, the water guide hole 12 of the switching valve body 10 is closed by the valve hole 9, and the outlet of the injection path 7 is at the discharge port 9a of the valve hole 9.
It's sunny. When injecting backfilling material, connect the backfilling material supply hose 21 to the backfilling material injection pipe 5, and close the on-off valve 2.
2 is opened, the backfill material pump 23 is driven, and the backfill material in the tank 25 is pumped. The pressure-fed backfilling material is supplied from the discharge port 9a through the backfilling material injection pipe 5 and the injection path 7 to the tail void 31 (see FIG. 1) between the cylindrical segment 30 and the excavation hole. .

Further, during cleaning, the supply of the backing material is stopped, the hydraulic cylinder 19 is extended, and the bell crank 15 is driven. As a result, the switching valve body 10 is pushed together with the switching bar 13, and the outlet of the injection channel 7 is closed by the switching valve body 10, as shown in FIG. It is connected to the outlet of the injection path 7 via. By opening the on-off valves 27 and 24, closing the on-off valve 22, and driving the water pump 28, water in the water tank 29 is pumped through the supply hose 26. The pumped water flows into the backfilling material tank 25 through the water injection pipe 6, the water injection channel 8, the water guide hole 12, the water injection channel 7, the backfilling material injection pipe 5, and the backfilling material supply hose 21.

The conventional backfilling material injection device described above has a discharge port 9
There is a drawback that the backfilling material tends to accumulate in the area a and cause caking, which causes the switching valve body 10 to become inoperable.

This idea is to eliminate the above drawbacks.
A water guide groove is provided on the inner peripheral surface of the valve hole of the switching valve body to connect one end of the water guide hole of the switching valve body and the outlet of the water injection pipe from an open state to a closed state of the outlet of the backfilling material injection pipe, and , the tip of the switching valve body protrudes from the rear end wall of the protective tube when the backing material injection conduit is closed.

Hereinafter, one embodiment of this invention will be explained with reference to FIGS. 8 to 10. In these figures, the same reference numerals as in FIGS. 1 to 6 represent the same or equivalent items.

An injection path 7 is provided on the inner peripheral surface of the valve hole 9 of the switching valve body 10.
from the open state (the state shown in Figure 8) to the closed state (the first
0 state) of the switching valve body 10.
The cross section connecting one end of 2 and the outlet of the injection channel 8 is U.
A shaped water guide groove 32 is provided in the axial direction of the switching valve body 10. Further, the switching valve body 10 is configured such that its tip portion protrudes from the rear end wall surface of the protection tube 4 when the outlet of the injection path 7 is closed.

FIG. 8 shows the state at the time of backfill injection, in which the switching valve body 10 is retracted and the injection path 7 is connected to the discharge port 9a. During cleaning, the piston rod 19a of the hydraulic cylinder 19 is made to protrude. As a result, the switching bar 13 and the switching valve body 10 are pushed and moved via the bell crank 39, and the water guide hole 12, which had been closed by the valve hole 9, is brought into the state shown in FIG. The water flows into the injection path 12 through the water guide groove 32 and the water guide hole 12. Next, when the outlet of the injection path is completely closed by the switching valve body 10, the switching valve body 10
The tip of the protective tube 4 is protruded from the rear wall end surface of the protective tube 4. The cleaning water still flows into the injection channel 7 via the water guide hole 12.

According to the invention described above, the cleaning water is allowed to flow into the injection path 7 from the beginning of the closing process of the injection path 7, and the backing material remaining in the discharge port 9a and the backing material adhere to the outside of the discharge port 9a. The switching valve body 10 operates smoothly because the backfilling material can be pushed out and removed by the tip of the bell crank of the switching valve body.
In addition, the backfilling material injection pipe can be reliably cleaned, and cleaning water is not discharged into the tail void where the backfilling material has already been injected, making it possible to thin the already poured backfilling material.
It can prevent the formation of blisters and air bubbles.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view showing an example of a shield excavator equipped with a backfill material injection device, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a cross-sectional plane showing a conventional backfill material injection device. 4 is a cross-sectional plan view showing a state in which the switching valve body has moved from the state shown in FIG. 3 and the outlet of the backfill material injection path is closed, and FIG. 5 is a sectional plan view showing the state shown in FIG.
A sectional view, Fig. 6 is an enlarged sectional side view of Fig. 3, and Fig. 7 is an enlarged cross-sectional side view of Fig.
The figure shows a backfilling material supply system and a washing water supply system, and FIGS. 8 to 10 are cross-sectional plan views showing one embodiment of this invention. M...Shield excavator, 1...Skin plate, 3...Katsuta foil, 4...Protection tube, 5...
Backfilling material injection pipe, 6...Water injection pipe, 7...Backfilling material injection path, 8...Injection channel, 9...Valve hole, 10...Switching valve body, 11...Seal, 12...Water guide hole , 13...
Switching bar, 14...Support plate, 15...Bell crank, 17...Support bracket, 19...Hydraulic cylinder, 21...Backfill material supply hose, 22...Opening/closing valve, 23...Backfill material pump, 24...Opening/closing valve, 2
5...Backfilling material tank, 26...Washing water supply hose, 27...Opening/closing valve, 28...Water pump, 29...
...Water tank, 30...Segment, 31...Tail void, 32...Water guide groove.

Claims (1)

[Scope of utility model registration request] A protection tube is provided on the outer peripheral wall of the skin plate that forms the shield body, and a backfilling material injection line and a water injection line for cleaning are configured separately within the protection tube, and the outlet of the backfilling material injection line can be opened and closed. A switching valve body is inserted into the valve hole so as to be able to slide in the axial direction, and when the outlet of the backfilling material injection pipeline is closed, the outlet of the water injection pipeline is communicated with the outlet of the backfilling material injection pipeline. In a shield tunneling machine with a hole, on the inner circumferential surface of the valve hole of the switching valve body,
A water guide groove is provided that connects one end of the water guide hole of the switching valve body and the outlet of the water injection pipe from an open state to a closed state of the outlet of the backfill material injection pipe, and the backfill material injection pipe is in a closed state. A backfilling material injection device characterized in that the tip of the switching valve body protrudes from the rear end wall of the protective tube.