JP2556430B2 - Shield backfill injector and segment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for simultaneous backfilling and a segment used in the shield work for tunnel construction.

[0002]

2. Description of the Related Art As a device for performing so-called simultaneous backfilling injection in which the backfilling injection for filling the gap between the shield excavator and the primary lining segment with mortar or the like is performed at the same time as the excavation of the shield excavator is shown in FIGS. There is something like the one shown.

In the drawing, 1 is a skin plate of a shield excavator, 2 is a tail portion thereof, an injection pipe 3 is provided along the outside of the tail portion 2, and its end is a rear end of the tail portion 2 and a spout 4 is provided. As

The other end of the injection pipe 3 branches in the middle and is taken into the skin plate 1 to form an injection port 5 for the backfill material, and from the branch portion toward the spout 4. A moving piston 6 is provided in the injection pipe 3 and its operating wire rope 7 is connected to a hydraulic jack 8. Further, a tail grout seal 9 made of a wire brush, a rubber plate or the like is projected inward at the rear end of the tail portion 2 having the spout 4.

In this way, when the backfill injection material is press-fitted into the injection pipe 3 through the injection port 5 along with the excavation of the shield excavator, this flows out from the spout 4 to the outside of the skin plate 1 and the segment and the ground. Filled in the gap between.

When the injection is completed, clogging can be prevented by moving the piston 6 by the hydraulic jack 8 via the operating wire rope 7 to expel all the remaining backfilling injection material.

As shown in FIG. 8, the injection pipe 3 is arranged outside the skin plate 1. Therefore, the injection pipe 3 is thickened for protection or is surrounded by a protective body so that it is not easily damaged. .

[0008]

There are other methods for preventing clogging of the injection pipe 3, such as backwashing with washing water. In both cases, the injection pipe 3 is arranged outside the skin plate 1. , That part will be protruding.

This projecting portion not only disturbs the ground, but also increases the resistance to excavation. If excess dug is performed to avoid this, the effect on the ground surface will also increase. In addition, problems such as difficulty in rolling correction occur.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and to provide the shield excavator on the outer periphery thereof so that a part of the device does not project, and moreover, maintenance such as clogging prevention is easy. It is to provide a backfill injection device and segment for the shield.

[0011]

According to the present invention, in order to achieve the above object, an injection rod for backfilling injection material is attached to the inside of a skin plate of a shield excavator and a cylinder is attached to the rod so as to project to the rear of the shield excavator. Movably provided on the other hand, on the other hand, in the segment, the injection port into which the tip of this injection rod is inserted is opened in the joint surface in the tunnel length direction, and the injection path is formed inside to open the outlet on the natural side, Also, a sealing material that contacts the inner wall of the injection path on the segment side is provided on the outer periphery of the injection rod tip, and a check valve that prevents outflow to the injection port side is provided in the injection path. It is what

[0012]

According to the first and third aspects of the present invention, the backfill injection is carried out from the injection rod provided inside the skin plate through the segment and from the spout opening on the ground side of the segment. As a device, all of them can be provided without protruding to the outside of the skin plate.

According to the second aspect of the present invention, in addition to the above-mentioned function, the tip of the injection rod can be inserted into the injection passage on the segment side without a gap through the sealing material, and the backfill injection is performed from the injection rod to the injection passage. It is possible to prevent the material from flowing into the shield excavator.

According to the present invention described in claim 4, it is possible to easily provide an injection path inside the segment so that an injection port faces the joint surface in the tunnel length direction and an injection port faces the natural side. The injection passages of the segments can be connected to each other via a joining sleeve.

According to the fifth aspect of the present invention, by providing the check valve in the injection path, it is possible to prevent the backfill injection material from flowing out to the injection port side even after the injection rod is pulled out.
According to the present invention described in claim 6, in addition to the operation described in claim 5, even if only one check valve is moved, it is possible to prevent the backfill injection material from flowing out near the injection port.

According to the present invention as set forth in claim 7, even if the width of the segment is large, the back-filling injection material can be sequentially poured out from the inner side of the spouts arranged in parallel at appropriate intervals, and can be filled evenly.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a shield backfill injection device according to the present invention. First, the shield excavator side will be described. As shown in FIG. 2, the backfill injection material injection rod 10 is an outer tube. The inner tube 10b has a double tube structure of 10a and the inner tube 10b, the inner tube 10b is slidable with respect to the outer tube 10a, and the tip of the inner tube 10b is used as a pouring head 10c. Further, the end portion of the outer tube 10a is bent to serve as a back filling material injection port 10d.

Such an injection rod 10 is horizontally provided inside the skin plate 1 of the shield excavator so as to fix the outer pipe 10a, and the inner pipe 10b projects its pouring head 10c to the rear of the shield excavator. To do so.

In the figure, 11a is a push-out cylinder and 11b is a return cylinder. The push-out cylinder 11a has its root fixed to the ring gutter material 12 of the shield excavator, and the return cylinder 11b has its root injected. Rod 10 outer tube
Pins are coupled to the outside of the injection rod 10a, and the rods of the pushing cylinder 11a and the returning cylinder 11b attached to the injection rod 10 are provided with a coupling metal fitting 13 that fits in the inner pipe 10b at the tips. A ratchet mechanism for sequentially sending out the inner pipe 10b may be incorporated in the combined metal piece 13.

Further, a check valve 14 is built in the inner pipe 10b, and a portion of the pouring head 10c has a thick bulging portion and a sealing material 15 is circumferentially arranged on the outer periphery thereof. As shown in FIG. 3, this inner tube 10b is a shield jack spreader.
A portion of the pouring head 10c projects rearward from the gap of 16.

Although not shown as another embodiment, the inner tube 10b of the injection rod 10 may be formed of a pressure resistant hose.

On the other hand, although the segment 17 is made of lightweight steel in this embodiment, as shown in FIGS. 4 and 5, a pipe 18 having a rectangular cross section is formed so as to penetrate between joint surfaces in the tunnel length direction. A sleeve 20 to be an injection path 19 is fitted inside the pipe 18. In this way, both ends of the sleeve 20 are exposed on the joint surface of the segment 17 in the tunnel length direction, one of them serves as the injection port 21, and also serves as the fitting portion of the joining sleeve 22 to the other segment. A hole 23 formed in the peripheral wall in the vicinity of the fitting portion is matched with holes formed in the pipe 18 or the face plate of the segment 17 to form a spout 23 that opens toward the natural side.

A check valve 14 for preventing outflow to the injection port side is provided in the injection path 19, and the check valve 14 slides in the sleeve 20 as shown in FIG. It is arranged inside and is movably provided to the injection port 21 side through the movable sleeve 25.

Next, the method of use will be described. In the segment 17 which is newly assembled as a ring, its injection path 19 communicates with the injection path 19 of the existing segment 17 by the joining sleeve 22, and this existing segment 17 has the injection path. The backfill injection material is already filled in the inside of the container 19, and the check valve 14 is located in the vicinity of the injection port 21 in contact with the joining sleeve 22.

When the pushing cylinder 11a is extended, the inner tube 10b of the injection rod 10 projects rearward and the pouring head 10c.
Is inserted into the injection path 19 on the segment 17 side from the injection port 21. At this time, the sealing material 15 of the pouring head 10c has the injection path 19
Is abutted against the inner wall and is inserted into the injection passage 19 without a gap.

In this way, the injection hose is connected to the feed port 10d, and the backfill injection material is press-fitted into the injection rod 10 from the delivery port 10d. 10c exits into the injection path 19 of the segment 17, passes through the check valve 14, exits from the spout 23 to the outside of the segment 17, and is filled in the clearance with the natural ground. Further, the back-filling injection material is poured from the pouring head 10c, the shield excavator is advanced, and the return cylinder 11b is contracted in synchronization with the speed thereof so that the inner pipe 10b of the injection rod 10 is gradually fed from the injection path 19. Try to pull it out.

When the filling of the backfill injection material is full,
The backfill pouring material has pressure and moves the movable sleeve 25 toward the pouring port 21. When the inner tube 10b is completely removed from the injection path 19, the check valve 14 in the movable sleeve 25 is located near the injection port 21, which prevents outflow of the backfilled injection material and also the injection path. Inside is completely filled with backfill material.

Thereafter, the return cylinder 11b is contracted to further retract the inner tube 10b of the injection rod 10, a new segment is assembled, and the same operation is repeated.

The same applies to the segment 17 when it is a concrete segment. Also, check valve 14
It is also possible to use this as a fixed check valve, but in that case, the injection path 19 is provided so that the inner tube 10b can be inserted sufficiently.
The back-filling injection material can be prevented from flowing out from the injection port 21 by separately providing a cover here.

Further, as shown in FIG. 7, a plurality of ground-side spouts 23 in the segment 17 may be arranged in parallel at appropriate intervals in the length direction of the tunnel. In this way, even if the width of the segment 17 is large, the backfill injection material can be sequentially poured out from the pouring outlet 23 on the back side, and can be filled evenly.

[0031]

As described above, the shield backfill injection device and the segment of the present invention are all provided inside the shield excavator so that a part of the device does not project to the outer periphery of the shield excavator. It is possible, there is no fear of disturbing the ground, and there is little resistance to excavation.

Since the device is provided inside the shield excavator, maintenance such as clogging prevention is easy, and automation and labor saving are possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a backfilling injection device for a shield according to the present invention.

FIG. 2 is a perspective view of the shield backfill injection device of the present invention on the shield excavator side.

FIG. 3 is a rear view of the shield backfill injection device of the present invention on the shield excavator side.

FIG. 4 is a perspective view of a backfill segment of the shield of the present invention.

FIG. 5 is an exploded perspective view of the backfilling segment of the shield of the present invention.

FIG. 6 is a partially cutaway perspective view of a movable sleeve.

FIG. 7 is a vertical sectional side view showing another embodiment of the backfilling injection device for the shield according to the present invention.

FIG. 8 is a perspective view of a simultaneous backfill injection device showing a conventional example.

FIG. 9 is a perspective view of a shield excavator side showing a conventional example.

[Explanation of symbols]

1 ... Skin plate 2 ... Tail part 3 ... Injection pipe 4 ... Injection port 5 ... Injection port 6 ... Piston 7 ... Wire rope 8 ... Hydraulic jack 9 ... Tail grout seal 10 ... Injection rod 10a ... Outer pipe 10b ... Inner pipe 10c ... Pouring head 10d ... Inlet 11a ... Extrusion cylinder 11b ... Returning cylinder 12 ... Ring gutter material 13 ... Coupling hardware 14 ... Check valve 15 ... Sealing material 16 ... Shield jack spreader 17 ... Segment 18 ... Pipe 19 ... Injection Channel 20 ... Sleeve 21 ... Inlet 22 ... Joining sleeve 23 ... Spout 24 ... Check valve 25 ... Movable sleeve

Claims (7)

(57) [Claims] 1. An injection rod of a backfill injection material is movably provided inside a skin plate of a shield excavator so as to project rearward of the shield excavator by attaching a cylinder to the injection rod. A backfill injection device for a shield, characterized in that an injection port into which a rod tip is inserted is opened in a joint surface in a tunnel length direction, and an injection passage is formed therein in which a spout is opened on a natural ground side. 2. A sealing material is provided on the outer periphery of the tip of the injection rod so as to contact the inner wall of the injection passage on the segment side.
Injection device for backfilling the described shield. 3. An injection port on a joint surface in a tunnel length direction,
A backfilling segment for the shield, which has internal injection passages that face the spouts on the ground side. 4. The injection path is formed by fitting a sleeve, one end of which serves as an injection port on the joint surface in the tunnel length direction, and the other end has a joint surface on the opposite side for joining to another segment. The back-filling segment of the shield according to claim 3, wherein the hole formed in the peripheral wall serves as a fitting portion of the shield. 5. The shield backfilling segment according to claim 3, wherein a check valve is provided in the injection path to prevent the check valve from flowing out to the injection port side. 6. The shield backfilling segment according to claim 3, wherein a check valve for preventing outflow to the inlet side is provided in the inlet passage so as to be movable toward the inlet side. 7. The shield backfilling segment according to claim 3, wherein the ground-side spouts are arranged in parallel in the tunnel length direction at appropriate intervals.