JPH0517355B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a simultaneous backfilling material injection device for a shield excavator, and more specifically, the present invention relates to a simultaneous backfilling material injection device for a shield tunneling machine, and more specifically, the invention relates to a simultaneous backfilling material injection device for a shield tunneling machine. The present invention relates to a device that is capable of injecting a backfilling material and cleaning a backfilling material passage after the backfilling material is extruded in a continuous operation.

[Conventional technology]

When the shield excavator excavates a tunnel, a segment ring is built inside the tail plate to form the tunnel wall. A space is created between the outer surface of the segment ring and the tunnel excavated by the excavator, so as the shield excavator excavates, a backfilling material is injected to fill the space.

As shown in FIG. 5, simultaneous backfilling material injection device 1
are attached to the skin plate 2 constituting the main body of the shield tunneling machine, and are also extended to the rear of the tail plate 3, as shown in FIG. will be installed in

From the injection pipe 4 of the simultaneous backfilling material injection device 1 shown in FIG. 5, the backfilling material made of two types of chemical solutions is introduced into the cylinder 5A by the pushing action of a pump for injecting the backfilling material (not shown). The backfilling material is injected from the opening 6 of the cylinder 5A, which is a passage, toward the space outside the segment ring.

Seal body 7 that slides and moves inside the cylinder 5A
is the piston 9 of the jack 5B via the rod 8.
When the shield excavator approaches the end of one ring of excavation, the pump for simultaneously injecting backfilling material is stopped. After the seal body 7 moves to the opening 6 shown in FIG. 7 and pushes out the backing material remaining in the cylinder 5A, it remains in the position of the opening 6, thereby preventing foreign matter from entering due to backflow.

The seal body 7 closes the opening 6 of the cylinder 5A until the injection of the backfilling material is restarted, so when cleaning water is supplied from the cleaning pipe 10, the cylinder 5A is filled with cleaning water. When the seal body 7 is returned to introduce the backing material into the cylinder 5A, the backing material adhering to the cylinder 5A is discarded together with the cleaning water.

In this way, the simultaneous backfilling material injection device 1 has the functions of injecting the backfilling material and cleaning the cylinder 5A. In addition, as a device equipped with the above-mentioned configuration and made to function, there is a
There is a backfill injection method described in Publication No. 18518.

On the other hand, although not shown, a horizontally movable backfill material injection pipe is attached to the outer surface of the skin plate of the shield body, and there is a simultaneous backfill material injection device that dispenses the backfill material toward the rear of the tail plate. .

An outlet member with a wire brush that fits into the outlet of this injection pipe is installed, and when injecting the backfilling material,
The injection tube advances toward this wire brush and pushes the wire brush open, and when injection is finished, the injection tube retreats, thereby closing the wire brush. This closure prevents foreign matter from entering.

[Problem to be solved by the invention]

By the way, the simultaneous backfilling material injection device 1 shown in FIG.
is the semicircular outer cylinder 1 shown in Fig. 8 over the entire length.
3, and a radius portion protrudes outward from the skin plate 2. Therefore, it is necessary to excavate an area that protrudes beyond the diameter of the tunnel excavated by the shield excavator. As a result, the efficiency of excavation work is hindered, and there are problems such as loosening and collapse of the ground.

In the latter example, unlike the former case, there is no need to provide a jack outside the skin plate, so the amount of outward protrusion of the simultaneous backfilling material injection device can be reduced. On the other hand, in order to remove the backfilling material that has adhered to the backfilling material injection pipe and outlet member, when the injection of backfilling material approaches the end, the introduction of the backfilling material into the injection pipe is stopped and grease is supplied to the injection pipe. do.

The grease filled in the injection pipe acts as a rust preventive, and when the backfilling material injection operation is restarted, the adhered backfilling material can be discharged.

By the way, in the discharge operation, the backfilling material mixed with grease fills the space outside the tunnel wall. As a result, the backfilling material mixed with many impurities such as grease is injected into the space outside the tunnel wall, which poses a problem that the properties of the backfilling material in the space at the backfilling material filling part are impaired. .

In the above example, moving the seal body forward and backward,
Since the actuator that moves the injection tube back and forth is mounted parallel to the machine axis, its mounting position is limited and the degree of freedom in installation within the machine is extremely low.

By the way, Japanese Patent Publication No. 44-18148 describes a mortar inflow prevention device having a structure in which a piston is inserted into a pipe and a flexible shaft extending from inside the machine to near the opening at the tip of the pipe is connected to the piston.

By employing such a flexible shaft, it is possible to use the flexible shaft to push a piston inserted into a long pipe to close the end opening of the pipe, or to pull the flexible shaft to remove the piston from the pipe. That is, even if the pipe is bent, if a flexible shaft is used, the piston attached to the tip of the shaft can be displaced.

The above-mentioned flexible shaft can push or pull out the piston when no pressure is applied to the front surface, but when pressure from mortar etc. is applied to the front surface of the piston located at the opening at the tip of the pipe, , does not have enough supporting force to prevent the piston from retracting. Therefore, there is a drawback that it is necessary to maintain the position of the piston by sending high-pressure air behind the piston.

The present invention was made in view of the above problems, and
The purpose of this is to reduce as much as possible the amount of protrusion of the simultaneous backfill injection device that spreads outward from the skin plate that makes up the shield excavator, and to provide sufficient force to push out the backfill material supplied into the pipe. A flexible member that can withstand the reaction force received from the injected backing material and can be placed in the backing material passage, and the installation position of the actuator necessary for moving the seal body forward and backward. To reduce the restrictions on tunneling and ensure a greater degree of freedom in the layout of equipment inside the machine, thereby reducing the amount of excess excavation that the shield excavation machine excavates, thereby preventing the ground from sinking and collapsing due to tunnel formation. In addition, it is an object of the present invention to provide a simultaneous backfill material injection device for a shield excavator that can easily perform a smooth backfill material injection function and a backfill material passage cleaning function.

[Means to solve the problem]

The present invention is applied to a shield excavator in which a hollow hole extending in the axial direction is formed in the tail plate, and a seal body that moves to push backing material backward is disposed inside the hollow hole.

Its characteristics are as shown in Figure 1.
A pipe 2 communicating with the hollow hole 22 and extending into the interior of the machine 34
3 is connected. A seal body 25 is provided at the tip,
In order to move the seal body 25 within the hollow hole 22,
A flexible member 24 that can be pushed and pulled within the hollow hole 22 and pipe 23 is provided. This flexible member 2
4 is a flow path 42 that communicates the front and back (see Figure 3)
It is formed by connecting the spheres 40 formed by.

On the other hand, a jack 37 for moving the seal body 25 is installed at the other end 23a of the pipe 23 via the flexible member 24. A backfilling material injection pipe 26 for supplying backfilling material into the hollow hole 22 is connected to the hollow hole 22 .

[Effect]

The backfilling material is inserted into the hollow hole 22 from the backfilling material injection pipe 26.
The inside of the hollow hole 22 at the rear of the seal body 25 is filled with the backing material. The supply of the backfilling material from the backfilling material injection pipe 26 is stopped, and the flexible member 24 moves forward within the pipe 23 and the hollow hole 22 as the jack 37 starts operating. When the seal body 25 moves to the opening 33, all of the backing material in the hollow hole 22 is discharged and stopped at that position. In this way, the backfilling material is injected into the space formed outside the tunnel wall.

Cleaning water is then supplied into the hollow hole 22 behind the seal body 25. The cleaning water fills the hollow hole 22 through the flow path 42 formed in each sphere 40 of the flexible member 24 .

When the seal body 25 is retracted together with the flexible member 24 by the operation of the jack 37, the cleaning water in the hollow portion 22 is discharged and re-enters the hollow hole 22 at the rear of the seal body 25. The backing material is supplied and the above operation is repeated.

〔Effect of the invention〕

According to the present invention, the flexible member is provided with a seal body at its tip and can be pushed and pulled inside the hollow hole extending in the axial direction of the tail plate and the pipe communicating with the hollow hole and extending into the machine. Since the jack that moves the seal body via a flexible member is installed at the other end of the pipe, there is greater freedom in selecting the mounting position and mounting orientation of the jack inside the machine where many devices and equipment are installed. improves.

Thereby, only the space necessary for providing the hollow hole needs to be secured in the tail portion. Therefore, the amount of outward or inward protrusion of the tail portion can be suppressed to a minimum, the maneuverability of the shield tunneling machine is improved, and ground depression and collapse of the ground can be prevented.

In addition, the flexible member is connected by spheres, which ensures the transmission of force by pushing and pulling inside the pipe. In addition, a flow path is formed in the sphere, so that the inside of the hollow hole after injecting the backing material can be filled with washing water and cleaned without removing the sealing body from the hollow hole. The cleaning water is discharged simply by retracting the seal body, and the next backing material can be immediately supplied into the hollow hole, thereby improving work efficiency.

〔Example〕

EMBODIMENT OF THE INVENTION Below, the simultaneous backfilling material injection device for the shield excavation machine of this invention is demonstrated in detail based on the Example.

The simultaneous backfilling material injection device 20 shown in FIG. 1 is used in a shield excavator, which has a hollow hole 22 extending in the direction of the machine shaft 30 in the tail plate 21, and a seal body 25 is provided in the hollow hole 22. .

This includes the hollow hole 22 of the member 21B of the tail plate 21 (see FIG. 2), the pipe 23, the flexible member 24, the seal body 25, the backfill material injection pipe 26, and the cleaning pipe 27. It is made up of.

The main body of the shield tunneling machine 28 is formed of a cylindrical skin plate 29, and a tail plate 21 is integrated at the rear of the skin plate 29. As shown in FIG. 2, the tail plate 21 is formed of a member 21A that is slightly thicker than the skin plate 29, and a member 21B that is thicker than the member 21A.

The member 21B (three in the figure) has the above-mentioned hollow hole 22 drilled in the direction of the machine shaft 30 into which a seal body 25 as shown in FIG. 1 is fitted. A plurality of tail seals 31 are attached to the rear end of the tail plate 21 to prevent the injected backfilling material from flowing back in the direction of the arrow 32.

The hollow hole 22 also has an opening 33 opened at the rear of the shield tunneling machine 28 and a tail plate 2.
openings 35, 36 facing into the cabin 34 in the front position of 1;
is provided, and a backfilling material injection pipe 26 communicating with the opening 35 is connected. Note that a backfilling material injection pump, a switching valve, etc. (not shown) are connected to this backfilling material injection pipe 26.

A pipe 23 that has a partial bend and extends into the cabin 34 is attached to the opening 36, and the pipe 23 is attached to a hydraulic jack 37 via a flange 23A formed at the other end 23a. It is being In addition, the hydraulic jack 37 is
It is fixed to the pillar 49, and the backfilling material injection pipe 26
A cleaning pipe 27 for supplying cleaning water to the pipe 23 and the hollow hole 22 is connected to the pipe 23 at the upstream side in the direction in which the backing material is extruded from the connection site.

By the way, if the shield excavator 28 is a small one that excavates a tunnel with a small diameter, this hydraulic jack 37 is installed horizontally, and
By making a U-turn on the pipe 23, it can be accommodated in a narrow interior of the machine.

The seal body 25 and the flexible member 24 will be described in detail. The seal body 25 shown in FIG. 1 is slidably fitted into the hollow hole 22 and can be moved in many directions along the machine axis. As shown in FIG.
From position 3, it is possible to move forward or backward a distance up to the retreat position R shown in FIG. Further, when the seal body 25 retreats, backfill material is injected from the backfill material injection pipe 26, and when the seal body 25 moves forward, the cleaning pipe 26
Cleaning water is supplied from 7.

The above-mentioned flexible member 24 is provided with the above-mentioned seal body 25 at its tip and can be pushed and pulled within the hollow hole 22 and the pipe 23 in order to move the seal body 25 within the hollow hole 22 . For this purpose, a spherical body 40 is formed with a flow passage 42 that communicates between the front and the rear.
It is made up of things that are connected. This is done by wire rope 38 as shown in FIGS. 3 and 4.
It is composed of a plurality of metals 39 and a plurality of spheres 40.

An end 38a of the wire rope 38 is connected to a piston rod of a hydraulic jack 37. Furthermore, since the seal body 25 is connected to the end 38b of the wire rope 38, the seal body 25 cannot be moved from the opening 33 of the hollow hole 22 to the retracted position R shown in FIG. can.

During the movement, the wire rope 38 pulls and retreats the sealing body 25 along with the plurality of spheres 40 and the metal 39 within the pipe 23 having the hollow hole 22 and the bent portions 23b and 23c, thereby transferring the force from the piston rod to the metal. The seal body 25 is pushed forward via the ball 39 and the sphere 40.

Further, concave spherical surfaces 41 are formed at both ends of the metal 39, and a half of the metal 39 is fixed to the end surface 25b of the sealing body 25, and the wire rope 38 is inserted through the through hole 39A. This metal 39
At a position adjacent to
The metal member 39 is always held in a slidable state by being in contact with the spherical surface 41 of the metal member 39.

In this way, a plurality of spheres 40 and metals 39 are arranged alternately to form a series of flexible members 24 shaped like beads. In this example, the sphere 40
is a short distance from the inner surface of the hollow hole 22 and pipe 23.
They are sized so that they have a diameter and are guided by their inner surfaces.

In addition, since the surface 40a of the sphere 40 is in surface contact with the sphere surface 41, when the sphere 40 moves through the hollow hole 22 and the pipe 23, it slides smoothly on the metal 39 and makes the necessary bending between them. bring about Therefore, the flexible member 24 can continuously pass through the bends 23b and 23c of the pipe 23. Incidentally, in this example, a steel ball is used as the sphere 40, and the metal 39 is made of bronze, which has the abrasion resistance required for a sliding member.

Semicircular grooves 42 are carved in four places on the sphere 40 as cleaning water flow paths, and the cleaning water flows through the cleaning pipe 2.
7, the cleaning water flows through these grooves 42 and fills the hollow holes 22 and pipes 23. The seal body 25 also includes two seal rings 43, 4 for providing sealing properties.
3 is fitted, the seal body 25 can move while pressing the inner surface of the hollow hole 22.

According to the embodiment with such a configuration, the simultaneous backfilling material injection device is operated as follows to inject the backfilling material into the space outside the tunnel wall and also to clean the inside of the hollow hole 22. I can do it.

While the shield excavator 28 shown in FIG. 1 excavates by pressing the end face of the segment ring 44 with a shield jack (not shown), a tunnel surrounded by the ground and a tunnel wall made of the constructed segment ring 44 are created. A space 46 is sequentially formed between the space 45 and the outside. And, while the shield excavator 28 is digging,
The seal body 25 attached to the flexible member 24 is located at the retracted position R, and the backfilling material injection pipe 26
The switching valve (not shown) is switched, and the backfilling material is transferred to the backfilling material injection pipe 26 by the extrusion action of the pump.
is introduced into the hollow hole 22 from.

The backfilling material is transferred through the hollow hole 22 and the opening 3
3 toward the space 46, the backfilling material fills the space 46 and becomes a filler between the earth and the outer surface of the tunnel wall 45. The backing material is made of two types of chemical solutions, including a coagulant, which hardens over time and strengthens the ground. In this way, the shield excavator 28 excavates while continuing to pour the lining material.

After digging a certain distance, the shield excavator 2
8 stops and evacuates the shield jack (not shown). Meanwhile, the switching valve is switched again to stop the supply of backfilling material from the backfilling material injection pipe 26, and at the same time, the hydraulic jack 37 is activated, and the flexible member 24, which is almost entirely housed inside the pipe 23, is operated. advance in the direction of arrow 47.

The seal body 25 fixed to its tip moves forward in the direction of arrow 48 from the retreated position R, and is assisted by the action of the piston ring 43 shown in FIG.
The entire amount of backing material No. 2 is discharged from the opening 33.

In the flexible member 24 shown in FIG. 3 during this forward movement, wire ropes 38 are inserted into the through holes 39A and 40A.
The metal 39 and the sphere 40, through which the metal 39 is inserted, are in a state where they can bend due to surface contact with each other at the spherical surface 41, and in addition, the sphere 40 is guided by the inner surface of the pipe 23 and the hollow hole 22, so that it is possible to bend the metal 39 and the sphere 40. Flexible member 24
moves smoothly inside the pipe 23 and the hollow hole 22. After the backfilling material has been discharged, the seal body 25 remains at the opening 33 and moves from the space 46 to the arrow 3.
Prevents foreign matter from entering in two directions.

Next, cleaning water is supplied from the cleaning pipe 27,
The cleaning water fills the pipe 23 and is also introduced into the hollow hole 22. Since the seal body 25 prevents the leakage, the hollow hole 22 is filled with cleaning water. At that time, the cleaning water is made of 40 spheres.
Since the water flows through the groove 42, the hollow hole 22 is easily filled with cleaning water, and preparation for cleaning is completed. While the seal body 25 is in the position shown in FIG. 3, the segment ring 44 is constructed and assembled to the tunnel wall 45, and the shield tunneling machine 28 is ready to resume excavation.

At this time, the hydraulic jack 37 is operated to retract the seal body 25 in the direction of the arrow 32. At this time, the switching valve is switched to connect the backfill material injection pipe 26 to the drain pipe, so the cleaning water filling the hollow hole 22 flows into the backfill material injection pipe 26 as the seal body 25 retreats. It is discarded together with the backing material for the hollow hole 22.

With the seal body 25 stopped at the retracted position R,
The shield jack presses the end face of the tunnel wall 45, and the shield excavator 28 excavates. As described above, when the space 46 formed between the earth and the outer surface of the tunnel wall 45 increases, the backfilling material injection pipe 2
6, the backing material is introduced into the hollow hole 22, and the space 46
The injection of backfill material will begin at the same time as excavation.

Although cleaning water was supplied from the cleaning pipe 27 and discharged from the backfill material injection pipe 26, the cleaning water was supplied from the backfill material injection pipe 2 without using the cleaning pipe 27.
It is also possible to operate the switching valve attached to 6 so that the cleaning water is supplied and discharged only from the backfilling material injection pipe 26.

In this way, on the tail plate and inside the aircraft,
For example, since the amount of outward protrusion of the simultaneous backfilling material injection equipment installed at three locations is suppressed, the shield excavator can simply excavate a small amount of excess protrusion, allowing the tunnel wall to have the planned diameter. construction work can be carried out.

Moreover, since a flexible member that is inserted through a hollow hole and a pipe is used to move the seal body, there are restrictions on the mounting position and orientation of the hydraulic jack inside the machine where many devices and equipment are installed. This has the advantage that the degree of freedom is more easily granted. As a result, it is necessary to secure only the space necessary for providing the hollow hole in the tail part, and as mentioned above, the amount of outward or inward protrusion in the tail part can be kept to a minimum. I can do it. As a result, not only the influence on the ground is reduced, but also the maneuverability of the shield tunneling machine is improved, and it is possible to prevent the ground from sinking or collapsing.

The flexible member is made up of connected spheres, and by pushing the flexible member with a jack,
The operating force for pushing out the backing material can be transmitted. Even if a force is applied to the sealing body after the backing material is injected, the reaction force can be counteracted by the flexible member whose position is held by the jack.

A groove is formed in the sphere as a flow path,
Even if the flexible member is present in a hollow hole or pipe, cleaning water can be filled through the groove, making it possible to reliably remove any adhesion of backing material. The cleaning process is realized in the restoration process after extruding the backing material, and is performed while the flexible member remains in the hollow hole, improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is an overall view of the simultaneous backfilling material injection device of the present invention, Fig. 2 is an enlarged cross-sectional view of the tail plate in the direction of the - arrow in Fig. 1, and Fig. 3 is a flexible view of the simultaneous backfilling material injection device. 4 is a sectional view taken along the line - in FIG. 3, FIG. 5 is an overall view of a conventional simultaneous backfilling material injection device, and FIG. 6 is a partial sectional view of a moving backfilling material injection device. FIG. 7 is a partially enlarged view of a conventional simultaneous backfilling material injection device, and FIG. 8 is a view taken along the - line in FIG. 5. 20... Simultaneous backfilling material injection device, 21... Tail plate, 22... Hollow hole, 23... Pipe, 2
3a...Other end, 24...Flexible member, 25...Seal body, 26...Piping for injecting backfilling material, 28...Shield excavator, 30...Machine shaft, 34...Inside the machine, 3
7... Jacket, 40... Sphere, 42... Distribution path (groove).

Claims (1)

[Scope of Claims] 1. A shield excavator in which a hollow hole extending in the machine axis direction is formed in the tail plate, and a seal body that moves to push backfilling material backward is disposed in the hollow hole, wherein the hollow hole a flexible member that is connected to a pipe that communicates with and extends into the machine, has the sealing body at its tip, and can be pushed and pulled within the hollow hole and the pipe in order to move the sealing body within the hollow hole; is provided, the flexible member is formed by connecting spheres forming a flow path communicating front and back, and the seal body is moved to the other end of the pipe via the flexible member. A simultaneous backfilling material injection device for a shield excavator, characterized in that a backfilling material injection pipe for supplying backfilling material into the hollow hole is connected to the hollow hole.