JP4015309B2 - Back-filling device for shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backfill injection device provided in a shield machine that constructs a tunnel while excavating underground.
[0002]
[Prior art]
As shown in FIG. 5, in the conventional shield machine 1 that is used when excavating and constructing underground tunnels or the like, a backfill injection for injecting a backfill material to stop the face at the time of ground cutting is performed. A device M is provided.
[0003]
As shown in FIGS. 5 to 7, this back-filling device M is provided on the upper part of the cylindrical shield frame 2 constituting the outer shell of the shield machine 1 so as to extend in the axial direction thereof. A backing material injection pipe 3 extending in the axial direction to inject the backing material behind the shield frame 2, a pipe-like sliding piston 4 positioned in parallel with the backing material injection pipe 3, and this backing A solid injection head 5 for joining the tips of the material injection pipe 3 and the sliding piston 4 and a hydraulic jack 7 for reciprocating the sliding piston 4 in the injection head 5; By reciprocating the sliding piston 4 with the hydraulic jack 7, the backing material supplied from the backing material injection pipe 3 is discharged to the rear side through the injection head 5, and Cleaning from sliding piston 4 side It was allowed to flow back so as to prevent clogging.
[0004]
That is, as shown in FIGS. 8 and 9, the injection head 5 has a through passage 8 that penetrates the shield frame 2 in the axial direction, and forms a backing material passage 9 so as to join the through passage 8. The back material injection pipe 3 is connected to the back material passage 9 side, and the sliding piston 4 is inserted into the through passage 8 so as to be reciprocally movable. Is the inlet 10 for the backing material.
[0005]
First, as shown in FIG. 10, when the backing material is supplied to the backing material injection pipe 3 side by a backing material supply pump (not shown) after the sliding piston 4 is pulled backward by the hydraulic jack 7, After the filling material joins from the backing material passage 9 to the through-passage 8 side, the filling material is discharged to the rear of the shield frame 2 from the injection port 10 at the tip thereof, and the backing material is injected into the face. At this time, the downstream side of the through-passage 8 is blocked by the piston portion 6 at the tip of the sliding piston 4 so that the backing material flowing into the through-passage 8 does not flow downstream in the through-passage 8. It has become.
[0006]
Next, when a predetermined amount of the backing material is discharged in this way, the supply of the backing material is stopped, and the sliding piston 4 is pushed out by the hydraulic jack 7 as shown in FIG. Then, the water is supplied to the sliding piston 4 side by a cleaning water supply pump (not shown). As a result, as shown in FIG. 12, the cleaning water flows from the passage hole 4 a formed at the tip of the sliding piston 4 to the side of the backing material passage 9 through the joining portion, and then in the backing material injection pipe 3. The backfill material injection pipe 3 is prevented from being clogged by washing away the backfill material in the interior while washing it back. Thereafter, the washed backing material is discharged together with washing water from the three-way valve 11 provided in the backing material supply line as shown in FIG.
[0007]
In FIG. 5, s is a segment constituting the tunnel wall, 12 is a tail seal for preventing intrusion of earth and sand water or a back-filling material, 13 is a hood covering the back-filling injection device M, and 14 is a back It is a frame that supports the insert material injection pipe 3, the sliding piston 4, and the like.
[0008]
[Problems to be solved by the invention]
By the way, as shown in FIG. 8, the injection head 5 of the back-injection apparatus M is provided with a grease line 15 for supplying grease serving as lubricating oil, and on the sliding surface of the sliding piston 4. The grease is supplied and the sliding is performed smoothly.
[0009]
However, before and after the grease line 15, a U-packing 16 (through-passage 8 side) and an O-ring 17 (sliding piston 4 side) for blocking the water of the face are provided. It was difficult for the grease supplied from to sufficiently reach the sliding surface of the piston portion 4a at the tip of the sliding piston 4.
[0010]
As a result, if the sliding piston 4 is reciprocated frequently, in the worst case, the piston portion 6 may be seized and fixed on the side of the through-passage 8 and the sliding piston 4 may malfunction. was there.
[0011]
When such a situation occurs, the entire work must be stopped and repaired, leading to a problem of a significant delay in work schedule. Further, as described above, since this back injection device M is provided on the outside of the shield frame 2, its repair is extremely difficult, and there is a problem that much labor and time are required for the repair.
[0012]
Therefore, it is conceivable that the grease line 15 is branched and the branch line 18 is extended to the distal end side of the through passage 8 to supply the grease to the piston portion 6 side of the sliding piston 4 as well. When this sliding piston 4 moves, there is a problem that a large amount of grease is ejected from the injection hole 19 at once.
[0013]
Therefore, the present invention has been devised to effectively solve such a problem, and the object thereof is a novel shield capable of effectively spreading grease over the entire sliding surface of the sliding piston. A backfill injection device for an excavator is provided.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention forms a through-hole that penetrates in the axial direction of the shield frame in a solid injection head provided at the rear end of the shield frame, and supplies a backing material to the through-path. In the back injection device of the shield machine, in which a pipe-like sliding piston is reciprocally inserted into the through passage, grease is supplied into the sliding piston. The grease pipe is inserted and provided, and the tip of the grease pipe is connected to the piston portion at the tip of the sliding piston so that the grease is injected into the sliding surface side of the piston portion.
[0015]
As a result, the grease is sufficiently spread to the sliding surface side of the piston portion, so that malfunction of the sliding piston due to seizure of the piston portion or the like can be prevented in advance.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0017]
FIG. 1 is a plan view showing an embodiment of a backfilling apparatus M for a shield machine according to the present invention, and FIG. 2 is a partially enlarged view showing the main part thereof.
[0018]
As shown in the figure, the tip of the backing material injection pipe 3 for supplying the backing material is connected so as to be inserted into a solid injection head 5 made of a metal body. The backing material is supplied to the through-passage 8 through the backing material passage 9 formed in the above.
[0019]
On the other hand, the pipe-like sliding piston 4 for supplying cleaning water is inserted into the through-passage 8 of the injection head 5 so as to be able to reciprocate in the length direction, and the piston portion 6 provided at the tip is backed. By moving back and forth across the junction with the material passage 9, as described above, the inlet 10 at the tip of the through-passage 8 is opened and closed, and the flow of cleaning water and backing material is controlled.
[0020]
Further, a grease pipe 20 is provided at the axial center portion of the sliding piston 4 so that grease serving as lubricating oil is supplied to the piston portion 6 side at the tip of the sliding piston 4.
[0021]
That is, as shown in FIG. 3, the piston portion 6 is formed with an injection passage 21 communicating from the rear end surface side to the sliding surface side, and the tip end of the grease pipe 20 is screwed into the injection passage 21. To be connected.
[0022]
Therefore, when the grease is supplied to the grease pipe 20 together with the conventional grease line 15 shown in FIG. 2, the grease flows from the tip of the grease pipe 20 to the piston portion 6 through the injection passage 21, and the sliding piston 4 slides. It is supplied simultaneously not only to the surface but also to the sliding surface of the piston portion 6.
[0023]
Then, when the sliding piston 4 is reciprocated in this state, as shown in FIG. 4, the grease injected from the piston portion 6 extends from the vicinity of the inlet 10 at the tip of the through passage 8 to the vicinity of the grease line 15, in other words, Sufficiently spread over the range of the stroke of the piston part 6.
[0024]
As a result, even if the sliding piston 4 is frequently reciprocated in the through passage 8, the piston portion 6 is not seized and fixed to the through passage 8, and the sliding piston 4 malfunctions. Thus, it is possible to always maintain a good operating state. Further, since the sliding surface of the piston portion 6 is always in contact with the surface of the through-passage 8 regardless of the reciprocating motion, the injected grease does not blow out at a stretch, and a certain amount. The grease is always stably injected.
[0025]
3, reference numerals 22, 23, and 24 denote O-rings fitted on the outer peripheral portion of the piston portion 6, respectively, which close the gap between the piston portion 6 and the through passage 8 together with the U packing 16 and the O-ring 17 described above. Intrusion of earth and sand water from the inlet 10 side and leakage of the backing material from the backing material passage 9 side are prevented.
[0026]
In the present embodiment, the outlet of the injection passage 21 is provided at one location above the sliding surface of the piston portion 6 so that the entire sliding surface can be spread by the penetration force of the grease itself. However, if a plurality of outlets of the injection passage 21 are provided, for example, radially from the central portion of the piston portion 6, the grease can be injected more favorably into the sliding surface.
[0027]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be exhibited.
[0028]
(1) Since grease piping is provided in the sliding piston so that grease is supplied to the sliding surface of the piston part, sufficient grease is applied not only to the sliding surface of the sliding piston but also to the sliding surface of the piston part. Can be supplied.
[0029]
(2) As a result, even if the sliding piston is reciprocated frequently, the sliding piston will not seize and stick to the through passage.
[0030]
{Circle around (3)} Therefore, it is possible to effectively avoid malfunction of the piston pipe, and it is possible to avoid repair work that has conventionally required a great deal of labor and time.
[0031]
(4) Since only the conventional piston part is replaced with a new one and the grease pipe is simply provided in the sliding piston, the conventional backing material injection device can be used as it is, and the cost increases. Can also be minimized.
[0032]
(5) Since the structure is relatively simple, the manufacturing cost is low, and the frequency of failures is extremely low, so that high reliability can be exhibited.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a back injection device for a shield machine according to the present invention.
FIG. 2 is a partially enlarged view showing a portion A in FIG.
FIG. 3 is a partially enlarged view showing the vicinity of a piston portion of the device of the present invention.
FIG. 4 is a partially enlarged view showing the vicinity of a piston portion of the device of the present invention.
FIG. 5 is a schematic view showing a mounting position of a conventional shield machine and its backfilling device.
FIG. 6 is a cross-sectional view showing an embodiment of a conventional backfilling device for a shield machine.
FIG. 7 is a plan view showing an embodiment of a conventional backfilling device for a shield machine.
8 is a partially enlarged view showing a portion A in FIG.
9 is a view taken along arrow XX in FIG. 11. FIG.
FIG. 10 is a plan view showing the operation of a conventional backfilling device for a shield machine.
FIG. 11 is a plan view showing the operation of a conventional backfilling device for a shield machine.
FIG. 12 is a plan view showing the operation of a conventional backfilling device for a shield machine.
[Explanation of symbols]
2 Shield frame 3 Backing material injection pipe 4 Sliding piston 5 Injection head 6 Piston part 8 Through passage 9 Backing material passage
20 Grease piping M

Claims (1)

A solid injection head provided at the rear end of the shield frame is formed with a through passage that penetrates the shield frame in the axial direction, and a backing material injection pipe that supplies the backing material is joined to the through passage, In the back-filling device for a shield machine in which a pipe-like sliding piston is reciprocally inserted in the through passage, a grease pipe for supplying grease is provided in the sliding piston, and the grease is provided. A back-injection device for a shield machine, wherein the tip of the pipe is connected to the piston portion at the tip of the sliding piston and grease is injected into the sliding surface side of the piston portion.

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