JPH10280884A - Back-filling material injecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothen the mixing of a back-filling material and facilitate the disassembling and cleaning by mounting a mortar feed pipe close to the opening part of a back-filling material injection pipe and a coagulant feed pipe having a check valve on the top end thereof in such a manner as to be dividingly attachable and detachable. SOLUTION: An injection port 4 is installed to the skin plate outer circumferential surface of the tail part of a shield machine. A vent pipe 5 is directly connected to the injection port 4. A back-filling material supplying means 10 is formed of a mortar feed pipe 11, a coagulant feed pipe 12 and a check valve, and it is connected to the vent pipe 5 in such a manner as to be removable through a maintenance window 7. The feed pipe 12 is drawn to the outside from the feed pipe 11 and independently arranged. In the injection of a back- filling material, liquids are force-fed from the feed pipes 11, 12, and mixed within the vent pipe 5, and injected to a lining part through the injection port 4. In cleaning, a pusher 2 is advanced to block the outlet of the vent pipe 5, and washing water is sent from a water passage 2a to the back-filling material supplying means 10 side to clean it. The feed pipes 11, 12 and the check valve 20 can be removed through the maintenance window 7 and cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material injection device, and more particularly to a backfill material injection device for injecting a backfill material into a gap between a lining body and an excavation pit wall at the rear of a shield machine. The present invention relates to a backfill material injection device that prevents solidification and blockage of a backfill material in a pipe portion, facilitates maintenance, and improves workability.

[0002]

2. Description of the Related Art Conventionally, a backfill material injection device used for injecting a backfill material injected between an excavated pit wall and a lining body behind a shield machine is already known. Various forms have been proposed and put to practical use. In many cases, a mortar containing fine aggregate as a main material and a coagulant (mainly sodium silicate) are mixed and injected in front of an injection port.

[0003] Such a backfill material injection device includes:
JP-B-59-18517 or JP-A-8-1
It is known from, for example, US Pat. In the backfill material injection apparatus described in the former publication, a mortar to be injected (hereinafter, referred to as a liquid A) and a coagulant (hereinafter, referred to as a liquid B) are mixed and then attached to a tail portion of an excavator. It is designed to be guided to the injection pipe and sent to the lining section. As a result, the length of the transport pipe after mixing the liquid A and the liquid B becomes longer, so that part of the injection material gradually adheres and condenses on the inner wall of the pipe, narrows the pipe, and impedes injection. Although the inside of the injection pipe attached to the tail of the excavator is configured to be easily washed with water, it is difficult to wash the inside when the inflow pipe from the mixing section to the injection pipe is long. There was a problem.

The backfill material injection device described in the latter publication is invented as a means for solving the above-mentioned problems, and a mixing section of the A liquid and the B liquid is provided in the injection pipe. At the tip, a wire brush is attached to the discharge port of liquid B for the purpose of ensuring the mixing.
A pusher is provided in the liquid discharge path so that the wire brush attached to the discharge port can be cleaned by the pusher.

[0005]

However, such a mixing / injection method at the tip of the injection pipe is more effective as means for preventing the blockage of the pipeline than in the case where the conventional mixing section is provided separately from the injection pipe. Although it has been found to be effective, it is too large in structure to incorporate the backfill material injection device having the above-described structure into the tail portion of the shield machine. In addition, there is another problem that it is difficult to perform maintenance for preventing the clogging phenomenon due to the condensation in the pipeline and the liquid B discharge portion from being caused in the mixed generation of the backfill material.

Further, in this type of apparatus, it is essential to perform an operation of washing the inside of the injection tube with water during a period of time between injection operations and preparing the next injection operation smoothly. For this purpose, it is required that the supply pipes and the mixing section for the liquid A and the liquid B to be injected and the vicinity thereof can be easily cleaned.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and enables smooth mixing adjustment and injection of a backfill material at the tip of an injection tube, and furthermore, quickly and easily. It is an object of the present invention to provide a backfill material injection device capable of disassembling and cleaning a road.

[0008]

In order to achieve the above-mentioned object, a backfill material injection device according to the present invention comprises a backfill material injection device attached to a tail portion of a shield machine. A mixing section is provided near the opening of the backfill material injection pipe having a built-in pusher, and a mortar supply pipe and a coagulant supply pipe having a check valve at the tip are detachably attached to the mixing section. The mortar supply pipe, the coagulant supply pipe and the check valve are connected so as to be detachable.

According to the present invention, the mortar supply pipe section, the coagulant supply pipe, and the check valve can be detached from the injection pipe, and these sections can be divided and detached. When the injection pressure increases, the inside of the pipe and the check valve can be easily cleaned by separating and removing from the inside through the maintenance window provided in advance at the tail part of the shield machine, and the work of filling the backfill material efficiently. Will be able to do it.

In the present invention, a bend pipe is attached near an opening of the backfill material injection pipe, and the mortar supply pipe is detachably connected to the other end of the bend pipe. The coagulant supply pipe is introduced from the outside to the connection part with a check valve disposed at the end of the coagulant supply pipe so as to coincide with the axis of the mortar supply pipe, and injected from the bend pipe. It is preferred that the section up to the opening of the tube is a mixing portion of the backfill material. With such a configuration, the mortar supply pipe and the coagulant supply pipe can be simultaneously removed from the connection section and inspected and cleaned before the mixing section during maintenance, thereby improving workability. Moreover, since it is structurally compact, it does not take up space and does not hinder the handling of other equipment in the tail of the shield machine.

Also, in the present invention, a bend pipe is attached near an opening of the backfill material injection pipe, and the mortar supply pipe is detachably connected to the other end of the bend pipe. The coagulant supply pipe is detachably connected via a check valve to an appropriate position in the middle of the mortar supply pipe and the coagulant supply pipe, and the mortar supply pipe and the coagulant supply pipe are supported by each other. It is preferable to be configured to be detachable by dividing into required lengths.
In this way, during maintenance of the pipelines, the respective pipelines can be separated and cleaned, replaced, etc., and the coagulant supply pipe can be supported by the mortar supply pipe, thereby maintaining stability and compact as a whole. The effect that can be summarized in is obtained.

[0012] The connection of the mortar supply pipe and the coagulant supply pipe to the bend pipe is divided into lengths each of which can enter and exit through a maintenance window in a tail portion of the shield machine. Is preferably configured to be disassembled by a bayonet joint and held by a locking mechanism at the rear end of each tube.
In this way, if the injection material is condensed and adheres to the inner wall of the pipe, and if a state that impedes the injection of the backfill material, such as fluctuation of the injection pressure or blockage of the flow, is observed, the operation is interrupted or the injection operation is temporarily stopped. At this time, release the lock mechanism of each supply pipe from the maintenance window, disconnect the connection at the joint, clean the inside, or replace it with a separately prepared spare part, and quickly perform the work of filling the backfill material without hindrance be able to. Further, even when the respective supply pipes are connected by plug-in joints, they are stably held without being loosened by being fixed and held by the lock mechanism at the rear end, thereby facilitating the attachment / detachment operation of the pipe section and improving workability. The effect is obtained.

The check valve attached to the leading end of the coagulant supply pipe includes the following: (a) The check valve is screwed and fixed to the front end of the coagulant supply pipe so that the liquid does not penetrate from the rear end to the front end. (B) a cylindrical valve body having a plurality of liquid outlet holes which open to the outer periphery at right angles to the liquid passage, and (b) a liquid which is fitted on the valve body and pushed out from the liquid outlet hole (C) a baffle plate attached to the tip of the valve element, and (d) a pipe line connecting the valve element to a pipe line. It is preferable to adopt a configuration including a valve support to be mounted.
In this case, the opening and closing of the valve pushes and expands the elastic tube fitted to the valve body by the pressure of the supplied coagulant,
The coagulant is allowed to flow out, and the coagulant flowing along the gap between the inner surface of the elastic body tube and the peripheral surface of the expanded valve is colliding with the baffle plate at the tip of the valve to diffuse and mix into the flowing mortar. And the mixing state can be enhanced. Further, when the pressure of the coagulant applied to the valve body decreases, in other words, when the supply of the coagulant stops, the tube contracts immediately and closes the liquid outlet hole, so that there is no liquid leakage. In particular, since the tube is in contact with the outer peripheral surface of the valve body over a large area, the valve closing operation can be ensured. Further, even if the backflow from the mixing section occurs, as described above, since the tube formed of the elastic body covers the valve body in a wide range, the backfill material mixed in the coagulant supply pipe does not flow back. Absent. Further, since the check valve has a very simple configuration as described above, no trouble occurs in the movable part, and the reliable operation can be maintained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a backfill material injection device according to the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of a backfill material injection apparatus according to the present invention. In FIG. 1A, the backfill material injection device 1 is not shown in detail,
The injection port 4 is mounted on the outer peripheral surface of the skin plate at the tail portion of the known shield excavator so as to open rearward along the axial direction. In this backfill material injection apparatus 1, an injection pipe 3 having a built-in pusher 2 is attached to the outer surface of the skin plate, and a bend pipe 5 is directly connected to a position slightly behind the end of the injection port 4 at the front of the injection pipe 3. A backfill material supply means 10 is detachably connected to an end of the bend pipe 5. The backfill material injection device 1 is covered with a protective member so that there is no obstacle due to the propulsion of the shield machine. The pusher 2 has a water passage 2a formed therein for supplying washing water supplied from the rear, and is pushed out to the end of the inlet 4 by a hydraulic cylinder 2b incorporated behind the inlet pipe 3 so that the outlet of the bend pipe 5 exits. The side is closed to open a water passage 2a through which the washing water is sent from the bend pipe 5 to the backfill material supply means 10 side.

The backfill material supply means 10 connected to the end of the bend pipe 5 includes a mortar supply pipe (A-liquid supply pipe) 1.
1 and a coagulant supply pipe (liquid B supply pipe) 12 and a check valve 20 that is opened only when the liquid B is supplied. The liquid supply pipe 11 and the liquid B supply pipe 12 are separately installed. A pipe is connected to each liquid supply unit (not shown).

The connection of the A liquid supply pipe 11 to the bend pipe 5 is connected by, for example, a bayonet joint so as to be detachable through a maintenance window 7 which can be opened and closed from the inside of the skin plate of the tail of the shield machine. . A liquid supply pipe 11 connected to this bend pipe 5 has
A check valve 20 provided at the distal end of the B liquid supply pipe 12 is provided toward the bend pipe 5 at the axial center of the connecting portion, and the B liquid supply pipe 12 connected to the check valve 20 is connected to the A liquid supply pipe 11.
From outside and are separately piped. Each of the A liquid supply pipe 11 and the B liquid supply pipe 12 has a length that can be taken out of the maintenance window 7 and is detachable by joints 14, 15, 15 '. As the joints 14, 15, 15 'of these pipes, one is formed into a tapered hole or a straight hole, and the other is formed into an outer shape to be fitted in the tapered hole or the straight hole, and O-rings 17, 17' are fitted to both fitting portions. It is preferable to use a type in which a seal is provided with an intervening member for facilitating the attachment / detachment operation and preventing liquid leakage. Also, a so-called one-touch type joint such as a screw joint or a coupler can be adopted as necessary.

When the plug-in joint is employed, in order to prevent the joint portion from being loosened, a lock mechanism 8 as shown in FIGS. 1B and 2 prevents each pipe from being displaced in the retreating direction. Means are applied. The lock mechanism 8 includes a locking metal fitting 9 that is detachably bolted to a mounting seat 3b attached to an end of a support piece 3a having an end fixedly attached to the injection pipe 3 and attached thereto. A liquid supply pipe 1 received in receiving notches 9a and 9b of A liquid supply pipe 11 and B liquid supply pipe 12 provided in metal fitting 9
In combination with the locking flanges 11 ′ and 12 ′ respectively fixed to the rear ends of the 1 and B liquid supply pipes 12, the locking flanges 11 ′ and 12 ′ are received on the end face of the locking fitting 9. The plug joint is prevented from loosening.

FIG. 3 shows an example of the check valve 20. The check valve 20 is connected to the B liquid supply pipe 12
A cylindrical valve element 21 directly connected by a threaded joint 25 to a tip of an elastic body (for example, a rubber material or a soft plastic material) fitted to the valve element 21, and a tube 23. And a metal protection cylinder 24 for fixing and protecting the base end. The valve element 21 is provided with a liquid passage 22 that does not penetrate from the rear end to the front end portion at the axial center. The liquid outlet holes 22 a are provided by the tubes 23. Further, the valve body 2 is provided at the distal end position of the valve body 21.
Circular baffle plate 2 having an outer diameter larger than the diameter of 1
6 is mounted coaxially with bolts 27.

The backfill material injection apparatus 1 constructed as described above.
According to this, during the operation of injecting the backfill material, the A liquid supply pipe 11
A liquid is supplied from the material supply section through a supply pipe connected to the liquid supply pipe, and the B liquid is supplied from the material supply section through a supply pipe connected to the B liquid supply pipe 12 at a predetermined ratio (for example,
A solution 10: B solution is pumped by 1). Then, the liquid B flows from the liquid passage 22 in the valve body 21 of the check valve 20 to the liquid outlet hole 22.
Due to the supply pressure sent out through a, the tube flows out along the peripheral surface of the valve body 21 through a gap generated by pushing and expanding the elastic tube 23 to be fitted. The B liquid flowing along the peripheral surface of the valve body 21 collides with a baffle plate 26 attached to the tip of the valve body 21 and is diffused and flows into the A liquid sent into the bend pipe 5. The mixture is mixed from the bend pipe 5 to the injection port 4 of the injection pipe 3 and injected from the injection port 4 into the space of the lining portion as a backfill material.

At the time of injecting the backfill material mixed and injected as described above, if the supply of the liquid B is stopped or its supply pressure is reduced, the check valve 20 is turned on by the reduction of the liquid supply pressure from the inside. Since the tube 23 fitted to the tube immediately contracts and restores from the expanded state by the elastic force and closes the liquid outlet hole 22a, a backflow from the A liquid supply pipe 11 (bend pipe 5) to the B liquid supply pipe 12 occurs. There is no. Even if a part of the backfill material condenses around the check valve 20 due to the continuous injection operation, since the check valve 20 has the above-described structure, the so-called valve seat is required. Since the liquid outlet hole 22a is closed by tightly fitting the elastic tube 23 on the peripheral surface of the valve body 21 over a large area instead of the opening / closing structure by contact with the valve, there is no risk of liquid leakage.

Further, in the backfill material injection device 1, since a mixed portion of the A liquid and the B liquid is formed at the tip of the injection port 4 of the injection pipe, the flow section of the mixed backfill material is formed. It is possible to reduce the occurrence of condensation of the liquid component on the tube wall and the like. However, the liquid component of the backfill material condenses around the liquid mixing section in the section from the bend pipe 5 to the end of the injection port 4, and the supply pressure is reduced by a gauge such as a pressure gauge provided in the liquid supply pipe. When the height is visually recognized and an abnormality of the injection part (such as narrowing of the conduit) occurs, it is necessary to stop the injection operation and clean the backfill material supply means 10.

In the cleaning operation of the backfill material supply means 10, the supply of liquid is stopped and the hydraulic cylinder 2b in the injection pipe is operated to inject the pusher 2 as in the conventional backfill material injection device. The outlet of the bend pipe 5 is closed by moving forward to the end of the inlet 4 (indicated by a chain line a in FIG. 1A). Thereafter, an operation of washing the inside of the solution A supply pipe 11 from the bend pipe 5 with a predetermined section of water to wash and remove solid matter adhering and condensing is performed.
During the washing by the water washing, the check valve 20 reliably performs the valve closing function as described above, and the washing water does not flow backward to the B liquid supply pipe 12 side. Further, since the check valve 20 has a cylindrical outer shape, there is an advantage that the operation of removing the adhered matter is easy even in washing with water, and that the check valve 20 can be easily cleaned. After cleaning, the next injection operation is performed.

In the case where the cleaning process by the water washing as described above is performed and the backfilling injection operation is continued, the cleaning process by the water washing cannot be performed and the narrowing or blockage of the pipe line occurs, as described above. The tip tube 11a of the liquid supply tube 11 is a bend tube 5
The fittings 14 are detachable by being inserted through the joint 14 and are piped into a structure that can be split short so as to be taken out of the maintenance window 7, so that the locking metal 9 of the lock mechanism 8 at the rear part of the injection pipe 3 is fixed. Unscrew and remove the bolt, release the lock mechanism 8 and remove. In this operation, when the A liquid supply pipe 11 and the B liquid supply pipe 12 are retracted, the joints 14, 15, and 15 'can be easily removed. Therefore, each pipe is divided and taken out from the maintenance window 7. When the distal end pipe 11a of the A liquid supply pipe 11 to which the check valve 20 is integrally attached from the end of the bend pipe 5 is removed at the position of the joint 14, the B liquid supply pipe 12 also comes off and the stenotic portion can be cleaned inside the machine. Needless to say, the supply of the liquid to both the A and B supply pipes is stopped, and the treatment of discharging the liquid accumulated in the pipes is first performed by a known means.

After the condensate in the closed portion (constricted portion) is removed in this manner, the cleaned distal end pipe 11a of the A liquid supply pipe 11 is inserted into the tapered part of the bend pipe 5 at the joint 14 and connected. The connection of the joint 15 ′ to the rear joint 15 and the B liquid supply pipe 12 and the fixation by the lock mechanism 8 may be restored by performing the operation reverse to the dismantling. If you are not allowed to prolong work interruptions,
Separately, a tip tube 11a of the A liquid supply pipe 11 having the above structure is prepared in advance, and the tip tube 11a of the new A liquid supply pipe 11 is prepared.
Workability can be improved by exchanging with. In addition,
If the sealing effect is reduced due to the attachment / detachment of the insertion joints 14, 15, 15 ', the sealing effect can be restored by replacing the O-ring, so that it can withstand long-term use.

Next, a second embodiment of the backfill material injection apparatus according to the present invention shown in FIG. 4 will be described. In this embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The backfill material injection apparatus 1A of this embodiment
The check valve 20A attached to the tip of the liquid supply pipe 12 is directly connected to the bend pipe 5 independently attached to the injection port 4 of the injection pipe 3.
The connection is made by joints 14 and 15. Therefore, the A liquid supply pipe 11 and the B liquid supply pipe 12 are separately arranged, and the B liquid sent out from the check valve 20A is ejected into the A liquid from the A liquid supply pipe 11 in the middle of the bend pipe 5. It is to be mixed. The joint 1
Since the components 4 and 15 are configured in the same manner as in the first embodiment, the description of the lock mechanism 8 is omitted.

In the backfill material injection apparatus 1A, the mixing position is set to a type in which the mixing position is closer to the injection port 4 than in the above-described embodiment. The liquid B is ejected in a direction orthogonal to the liquid A which flows in a large amount, so that the liquid is disturbed. Since the B liquid supply pipe 12 is independently connected to the bend pipe 5, the stability is achieved by the support 17 for holding the B liquid supply pipe 12 and the A liquid supply pipe 11 mutually. To be.

As shown in FIG. 5, the check valve 20A is an elastic tube 23 fitted on the valve body 21.
About the same as the check valve 20 of the above embodiment,
The protection tube 28 provided outside is extended to the tip portion, and the tip portion of the protection tube 28 can be detachably attached to a connection portion provided in the middle of the bend pipe 5 by a screw joint 29 or a coupler type joint. Connected. In the check valve 20A, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. In addition, the joints 14, 15, 1 which can be disassembled with a length that can be detached from the maintenance window 7 in the same manner as in the previous embodiment, with respect to the distal ends of the A liquid supply pipe 11 and the B liquid supply pipe 12.
Connected at 5 '.

By doing so, even in the case of the backfill material injection apparatus 1A, when the backfill material injection is hindered and cleaning is required, after the cleaning operation, the solution A The supply pipe 11 has its tip pipe 11a detached, and the B liquid supply pipe 12 side has a check valve 20A at the protection cylinder 2A.
The operation can be resumed by removing the joint from the joint at the connection between the bend pipe 7 and the bend pipe 5, performing a cleaning process, and returning to a normal state for mounting. In addition, according to this apparatus, since the A liquid supply pipe 11 and the B liquid supply pipe 12 are separately connected to the mixing section, the A liquid supply pipe 11 may be used depending on the injection conditions.
Alternatively, only one of the liquid B supply pipes 12 can be removed for processing.

[Brief description of the drawings]

FIG. 1 is a first view of a backfill material injection device according to the present invention.
It is a figure which shows an Example, (a) is a top sectional view which shows the front half part of a backfill material injection apparatus, (b) is a top view which shows a rear half part.

FIG. 2 is a II-II view in FIG. 1 (b).

FIG. 3 is a longitudinal sectional view showing an example of a check valve attached to a coagulant supply pipe.

FIG. 4 is a second view of the backfill material injection device according to the present invention.
It is a figure showing an example.

FIG. 5 is a diagram showing another example of the check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Backfill material injection apparatus 2 Pusher 3 Injection pipe 4 Injection port 5 Bend pipe 7 Maintenance window 8 Lock mechanism for both A and B liquid supply pipes 9 Locking fitting 10 Backfill material supply means 11 A liquid supply pipe 11a Tip pipe of A liquid supply pipe 12 B liquid supply pipe 14, 15, 15 ', 29 Fitting 17 Piping support 20, 20A Check valve 21 Valve body 22 Liquid passage 22a Liquid outlet hole 23 Elastic tube 24, 28 Protection tube 26 Baffle

Claims (5)

[Claims] 1. A backfill material injection device attached to a tail portion of a shield machine, wherein a mixing section is provided near an opening of a backfill material injection pipe having a built-in pusher. A back pipe characterized in that a supply pipe and a coagulant supply pipe having a check valve at the tip are detachably attached, and the mortar supply pipe, the coagulant supply pipe and the check valve are connected so as to be detachable. Filling material injection device. 2. A bend pipe is mounted near an opening of the backfill material injection pipe, and the mortar supply pipe is detachably connected to the other end of the bend pipe, and the mortar supply pipe is connected to the bend pipe. The coagulant supply pipe is introduced from the outside into the section, and a check valve is disposed at the end of the coagulant supply pipe so as to coincide with the axis of the mortar supply pipe. The backfill material injection device according to claim 1, wherein the section up to the section is configured to be a mixing section of the backfill material. 3. A bend pipe is mounted near an opening of the backfill material injection pipe, and the mortar supply pipe is detachably connected to the other end of the bend pipe. The coagulant supply pipe is detachably connected via a check valve.The mortar supply pipe and coagulant supply pipe are supported by each other with support, and the mortar supply pipe and coagulant supply pipe are divided into required lengths. The backfill material injection device according to claim 1, wherein the backfill material injection device is configured to be detachable. 4. The connection of the mortar supply pipe and the coagulant supply pipe to the bend pipe is divided into lengths each of which can enter and exit through a maintenance window in a tail portion of the shield machine. The backfill material injection device according to any one of claims 1 to 3, wherein the backfill material is configured to be disassembled by a bayonet joint and held by a locking mechanism at a rear end of each pipe. 5. A check valve attached to the leading end of the coagulant supply pipe comprises: (a) a screw which is screwed and fixed to the tip of the coagulant supply pipe so that liquid does not penetrate from the rear end to the front end; A passage is provided, and a cylindrical valve body having a plurality of liquid outlet holes opened to the outer periphery orthogonal to the liquid passage,
(B) an elastic tube which is formed on the valve body so that a liquid flow space is formed between the valve body and the outer periphery of the valve body by the pressure of the liquid pushed out from the liquid outlet hole; (c) the valve; The backfill material according to any one of claims 1 to 3, further comprising: a baffle plate attached to a tip of the body; and (d) a valve support for attaching the valve body to a pipe. Infusion device.