JPS63181891A - Back-filling material injector for shield excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a backfill material injection device for a shield excavator, and more specifically, the device is installed on the outer peripheral wall of a skin plate forming a shield body, and The present invention relates to a device for injecting a backfilling material into a tail void portion due to a difference in outer diameter of a segment.

[Conventional technology]

An example of a shield excavator equipped with a backfilling material injection device will be explained with reference to FIGS. 4 and 5.

A skin plate (
A tail seal 4 whose lip portion is in contact with the outer circumferential surface of the cylindrical segment 3 is attached to the inner circumferential surface of the rear end of the cylindrical outer shell (cylindrical outer shell) 2, and the outer circumferential wall constitutes a backfilling material injection device. A plurality of approximately semicircular protection tubes 5 are provided at intervals on the circumference. When the shield excavator 1 excavates the other mountain 100 and assembles the segment 3 on the inner circumferential side of the tail seal 4, a space is created immediately after the shield excavator 1 (a space due to the difference between the excavation outer diameter and the segment outer diameter) That is, the backfilling material is injected into the tail void 6 by the backfilling material injection device in synchronization with the propulsion of the shield excavator 1.

As this type of conventional backfilling material injection device, there is one shown in FIGS. 6 to 8. This backfilling material injection device has a backfilling material injection lower on the rear end wall of a protective tube 5 attached to the outer peripheral wall of the rear end of a skin plate 2, and a backfilling material injection conduit 8 and a slider are provided in the protective tube 5. Hydraulic cylinders 9 as dynamic operation means are installed in series, while a spool 10 for opening and closing the backfilling material injection lower is slidably inserted into the backfilling material injection pipe 8, and the spool 10 is connected to the hydraulic cylinder. 9 is connected to the rod 9a. In addition, an inspection port 11 for maintenance,
Provided on the skin plate 2 outside the sliding range S of the shield main body propulsion spreader 12, and providing a backfilling material supply port 13 and a cleaning water supply port 14 in the backfilling material injection conduit 8 at the inspection port 11 thereof, A backfill material supply hose 15 connected to the backfill material supply port 13 and a wash water supply hose 16 connected to the wash water supply port 14 are pulled out from the inspection port 11. Further, the hydraulic hose 17 of the hydraulic cylinder 9 is pulled out through an opening 18 provided in the skin plate 2 in front of the inspection port 11.

When injecting the backfilling material, the hydraulic cylinder 9 moves the spool 10 to the solid line position shown in the figure to communicate the backfilling material supply port 13 with the backfilling material injection lower, and the backfilling material is supplied from the backfilling material supply hose 15. The backfilling material is fed into the backfilling material injection conduit 8, and is injected into the tail void from the backfilling material injection lower. Furthermore, when the injection of backfilling material is completed and the inside of the pipeline is cleaned, the spool 10 is moved to the temporary P position shown in the figure by the hydraulic cylinder 9. , to the line position to close the backfilling material injection lower, and at the same time communicate the backfilling material supply port 13 and the cleaning water supply port 14, so that the cleaning water supplied from the cleaning water supply hose 16 is transferred to the backfilling material injection pipe. Road 8
゜The backfilling material remaining in the pipe is flushed out by flowing it into the backfilling material supply hose 15. In the figure, 3 indicates a segment and 4 indicates a tail seal.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, an inspection port 11 for maintenance is provided in the skin plate 2 outside the sliding range S of the spreader 12, and a backfilling material supply port 13 and a cleaning water supply port 14 are provided in the inspection port 11, and Since the backfill material supply hose 15 connected to the backfill material supply port 13 and the wash water supply hose 16 connected to the wash water supply port 14 are pulled out from the inspection port 11, the length of the backfill material injection pipe 8 is However, the line becomes extremely long, and the amount of backfilling material remaining in the backfilling material injection conduit 8 also increases.

Therefore, cleaning with cleaning water must be performed for a long time. In addition, in this cleaning, the cleaning water is sent into the backfilling material injection pipe 8 and then flows out from the backfilling material supply port 13 to the backfilling material supply hose 15, but the backfilling material injection pipe 8 is long. Then, the flow of the cleaning water at the portion near the backfilling material injection lower part becomes weaker, and the cleaning effect of the remaining backfilling material is reduced. As a result, the cleaning of the backfilling material in the backfilling material injection conduit 8 may be incomplete and it may solidify on the wall surface of the conduit. If the backing material solidifies, the spool 10 will not be able to slide smoothly or will be unable to slide, resulting in a loss of function as an injection device.

In addition, when the backfilling material injection pipe 8 becomes longer, the hydraulic cylinder 9
Therefore, a hydraulic cylinder with a long stroke L1 must be used, and the entire injection device becomes long. For hydraulic cylinders with longer strokes,
It also takes time to center it.

An object of the present invention is to shorten the length of the backfilling material injection pipe, thereby shortening the cleaning time, increasing the cleaning effect, and employing a hydraulic cylinder with a short stroke as a sliding operation means. To provide a backfilling material injection device for a shield excavator that can shorten the entire device.

[Means for solving problems]

The above purpose is to provide a protection tube on the outer circumferential wall of the skin plate that forms the shield body, provide a backfilling material injection port on the rear end wall of the protection tube, and provide a backfilling material injection conduit and a sliding passageway in the protection tube. An operating means is installed, a backfilling material supply port and a washing water supply port are provided in the backfilling material injection pipe, and a spool for opening and closing the backfilling material injection port is slid into the backfilling material injection pipe. the spool is connected to the sliding operation means, and the sliding of the spool allows communication between the backfilling material injection port and the backfilling material supply port, and communication between the backfilling material supply and the washing water supply port. In a backfilling material injection device for a shield excavator, which is configured to switch between A backfilling material injection pipe and the sliding operation means are provided, a backfilling material supply pipe connected to the backfilling material supply port, a cleaning water supply pipe connected to the cleaning water supply port, and a working fluid supply to the sliding operation means. This is achieved by configuring the exhaust pipe to be pulled out from an opening provided in the skin plate outside the sliding range of the spreader.

[For production]

An inspection port for maintenance is provided in the skin plate within the sliding range of the spreader, and a hydraulic cylinder as a sliding operation means and a backfilling material injection pipe are installed on the rear end side of the inspection port. The length of the material injection pipe becomes short.

This reduces the amount of backfilling material remaining in the backfilling material injection pipe, which reduces cleaning time.Also, because the backfilling material injection pipe is shortened, the area near the backfilling material injection port This eliminates the weakening of the flow of cleaning water in the pipe, which improves the cleaning effect, eliminating problems such as caking of the backing material on the pipe wall due to incomplete cleaning. By shortening the path, a hydraulic cylinder with a short stroke can be used, and the entire device can be shortened.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of a backfilling material injection device according to the present invention, FIG. 2 is a cross-sectional view taken along line n--n in FIG. 1, and FIG. 3 is a cross-sectional view taken along line -■ in FIG. In the figure, 2 is a skin plate, 3 is a segment, 4 is a tail seal, 5 is a protection tube, and 12 is a spreader. A backfilling material inlet 21 is provided in the rear end wall of the protective tube 5 . An inspection port 22 for maintenance is provided in the skin plate 2 within the sliding range S of the spreader 12, and a hydraulic cylinder 23 and a backfilling material injection pipe 24 are connected in series in the protective tube 5 behind the inspection port 22. established in the state. A spool 2 for opening and closing the backfilling material injection port 21 is provided in the backfilling material injection pipe 24.
5 is slidably inserted, and its spool 25 is connected to the rod 23a of the hydraulic cylinder 23. Further, the backfill material injection conduit 24 is provided with a backfill material supply port 26 and a wash water supply port 27 . There is a pipe 2 in the backfilling material supply port 26.
One end of the pipe 8 is connected to the other end of the pipe 2, and a backfilling material supply hose 29 is connected to the other end of the pipe 2. One end of a pipe 30 is connected to the wash water supply port 27, and a wash water supply hose 31 is connected to the other end of the pipe 30. Further, one end of piping 32, 33 is connected to the head side port and rod side port of the hydraulic cylinder 23, respectively.
．． Hydraulic pressure supply/discharge hoses 34 and 35 are connected to the other ends of 33, respectively. Each piping and each hose mentioned above is inspection port 2.
It is connected in two parts. In addition, the backfilling material supply hose 29
．． Cleaning water supply hose 31 and hydraulic water supply and drainage hose 34.3
5 is pulled out from an opening 36 provided in the skin plate 2 in front of the inspection port 22.

In addition, a detection rod 37 is attached to the side opposite to the rod of the piston 23b of the hydraulic cylinder 23 and protrudes outside the cylinder.
A first detector 38 for detecting the retracted position of the rod 23a and a second detector 39 for detecting the protruding position of the rod 23a are installed. Incidentally, 40 in FIG. 1 is a cover that closes the inspection port 22, and 41 is a gasket interposed between the inspection port 22 and the cover 40.

In this injection device, when injecting the backfill material, the rod 23a of the hydraulic cylinder 23 is retracted so that the spool 25
is moved to the position indicated by the solid line to communicate the backfilling material supply port 26 and the backfilling material injection port 21, and feed the backfilling material supplied from the backfilling material supply hose 29 to the backfilling material injection pipe 24, The backfilling material is injected into the tail void from the injection port 21. Furthermore, when the injection of the backfilling material is finished and the inside of the pipeline is cleaned, the rod 23a of the hydraulic cylinder 23 is protruded to move the spool 25 to the imaginary line position shown in the figure to close the backfilling material injection port 21 and simultaneously close the backfilling material injection port 21. The backing material supply port 26 and the cleaning water supply port 27 are communicated with each other, and the cleaning water supplied from the cleaning supply hose 31 is passed through the backing material injection pipe 24. The backfilling material is passed through the backfilling material supply hose 29 to wash away the backfilling material remaining in the pipe. Further, maintenance through the inspection port 22 is performed before the segment 3 is assembled.

In the above embodiment, the skin plate 2 has an inspection port 22 for maintenance within the sliding range S of the spreader 12.
Since the hydraulic cylinder 23 and the backfilling material injection pipe 24 are provided on the rear end side of the inspection port 22,
The length of the backfilling material injection conduit 24 is shortened as shown by the illustrated dimension L2. This reduces the amount of backfilling material remaining in the backfilling material injection conduit 24, so cleaning time can be shortened. In addition, since the backfilling material injection pipe 24 is short, the flow of cleaning water at the part near the backfilling material injection port 21 is not weakened, that is, the cleaning effect is improved, so the backfilling material can be cleaned. The problem of caking on the pipe wall surface due to imperfections is eliminated.As a result, the spool 25 always slides smoothly and can function as an injection device for a long period of time.

In addition, in the conventional device, the actual stroke amount of the spool 10,
That is, since the actual stroke amount of the hydraulic cylinder 9 cannot be detected, accessory equipment such as a simulated cylinder or a flow meter that interlocks with the hydraulic cylinder 9 is required in order to detect the opening/closing state of the backfilling material injection lower. In contrast, in this embodiment, the retracted position of the rod 23a of the hydraulic cylinder 23 can be detected by the first detector 38, and the protruded position of the rod 23a can be detected by the second detector 39, that is, the actual stroke amount. Since it is possible to detect the opening/closing state of the backfilling material injection port 21 without requiring accessory equipment such as a simulated cylinder or a flow meter.

Furthermore, since the conventional device has a long overall length, in the case of a half-folding shield in which the shield body bends back and forth, the shield body straddles the front skin plate and the rear skin plate, making it impossible to implement. On the other hand, in this embodiment, by shortening the backfilling material injection pipe 24, a hydraulic cylinder with a short stroke (L2) can be used as shown in the figure, and the length of the entire device can be shortened. It can also be implemented on shields. That is, when the skin plate 2 is bendable at the divided portion 2A as shown in FIG. 1, the entire injection device including the protective tube 5 can be installed on the outer peripheral wall of the rear skin plate 2.

〔Effect of the invention〕

According to the present invention, it is possible to shorten the length of the backfilling material injection pipe, thereby shortening the cleaning time and improving the cleaning effect.Furthermore, a hydraulic cylinder with a short stroke is used as a sliding operation means for the spool. can be adopted, and the entire device can be shortened.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a cross-sectional view of a backfilling material injection device according to the present invention, and FIG.
1r-n sectional view in the figure, and FIG. 3 is the I[l-111
4 is a sectional side view showing an example of a shield excavator, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a sectional view of a conventional backfill material injection device, and FIG. is a cross-sectional view taken along the line ■-■ in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 1... Shield tunneling machine, 2... Skin plate, 3
...Segment, 5...Protection tube, 6...Tail void, 12...Spreader, 21...Backfilling material injection port, 22...Inspection port for maintenance, 23...Hydraulic cylinder , 23a...Loft, 23b...Piston, 24...Backing material injection pipe, 25...Spool, 2
6...Backfilling material supply port, 27...Washing water supply port, 29
... Back filling material supply hose, 31 ... Washing water supply hose, 34. 35 ... Hydraulic pressure supply and discharge hose, 36 ... Opening. #! , 4 Figure 5

Claims (1)

[Claims] 1. A protective tube is provided on the outer peripheral wall of the skin plate that forms the shield body, a backfilling material injection port is provided on the rear end wall of the protective tube, and a backfilling material injection conduit and sliding operation means are provided within the protective tube. A backfilling material supply port and a washing water supply port are provided in the backfilling material injection pipe, and a spool for opening and closing the backfilling material injection port is slidable into the backfilling material injection pipe. insert,
connecting the spool to the sliding operation means, and communicating the backfilling material injection port and the backfilling material supply port by sliding the spool;
In a backfill material injection device for a shield excavator, which is configured to switch communication between a backfill material supply and a washing water supply port,
A maintenance inspection hole is provided in the skin plate within the sliding range of the shield main body propulsion spreader, and the backfilling material injection conduit and the sliding operation means are provided on the rear end side of the inspection hole to supply the backfilling material. A backfill material supply pipe connected to the opening, a washing water supply pipe connected to the washing water supply port, and a working fluid supply/discharge pipe to the sliding operation means are connected to the opening provided in the skin plate outside the sliding range of the spreader. A backfilling material injection device for a shield excavator, which is characterized by being pulled out.