JP3348761B2 - Backfill injection device for shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill injection device for a shield machine, and more particularly, to a grout material for backfill injection of tail voids generated when the shield machine is propelled in a shield method or a direct lining method. The present invention relates to a back-filling injection device of a shield machine applicable as a back-filling injection device at the time of filling.

[0002]

2. Description of the Related Art In a shield method or a direct lining method, when a shield machine for excavation is propelled, a void called a tail void is generated at a rear end (tail portion) of the shield machine. Need to be filled. The operation of filling the tail void with a grout material for injection (hereinafter, referred to as backfilling material) is called backfilling.

[0003] After being injected into the tail void, the backfill injection material is required to be immediately gelled in order not to be diluted with groundwater. Therefore, a hardening material (hereinafter, referred to as a liquid A) and a coagulating material (hereinafter, referred to as a liquid). (Hereinafter referred to as B liquid) is generally used.

There are two methods for mixing the two liquids, such as a method of simply mixing the liquid A and the liquid B inside the mixing tube and a method of mixing the liquid A with the mist of the liquid B. The two liquids differ in specific gravity and viscosity. This is not a sufficient method for completely mixing the liquid, and causes variations in gel time and uncured backfilling material.

[0005] Regarding the cleaning of the backfill injection device, since the backfill injection material mixed inside the two-liquid simultaneous injection tube (mixing device) has already started to gel, during the repeated injection, Adhesion gradually occurs on the inner wall surface of the tube, and it becomes impossible to remove the adhered matter by a cleaning method that only sends the cleaning liquid, and eventually, the clogging occurs.

[0006] By the way, in the construction of a small section, a long distance, and a curved tunnel with an inner diameter of about 1.2 m, the present applicant has applied a small section shield in-situ automatic lining method that automates the underground work from excavation to tunnel lining ( The method will be referred to as the M2 method hereinafter). In this M2 method, a simultaneous backfill injection method is adopted. In order to backfill the tail voids, as shown in FIG. An outer mold frame 92 and a simultaneous injection pipe 93 are provided in addition to a skin plate 91 extending rearward of the propulsion shaft.

[0007] Therefore, the tail void TV of the M2 method has the thickness of the outer mold frame 92 and the simultaneous injection pipe 93 in addition to the skin plate 91 as compared with the general shield.
It becomes larger as shown in FIG.

Further, as shown in FIG. 10, the backfill injection apparatus 100 in the conventional M2 method employs riser pipes 96 and 97 for A and B liquids having cleaning liquid injection nozzles 94 and 95 in a simultaneous injection pipe 93, respectively. Washing waste liquid collecting device 98, and
A cleaning telescopic jack 99 is provided.

[0009]

However, the conventional backfill injection apparatus 100 has the following problems.

(1) Since the cleaning liquid is injected from the cleaning liquid injection nozzles 94 and 95 in a direction perpendicular to the rising pipes 96 and 97, sufficient cleaning power cannot be obtained. Also, the riser 9
7 has a long length H, and the range that can be cleaned by the cleaning liquid injection nozzles 94 and 95 is limited to the simultaneous injection pipe 93 until the liquid A and the liquid B of the backfill injection material are mixed and injected into the tail void. Therefore, for example, when the injection pressure increases with the progress of backfill injection, the liquid A flows backward to the liquid B injection pipe side, and the entire liquid B injection pipe is solidified and blocked in many cases.

In the prior art, there is no valve for preventing backflow in such a case, and there is no method for cleaning the vicinity of the inlet of the blocked liquid A or B, so that every time the blockage occurs, manual decomposition, Cleaning had to be carried out, which often had a large effect on the efficiency of construction.

(2) As shown in FIGS. 9 (a) and 9 (b), the simultaneous injection pipe 93 is provided with a cylindrical shield machine 90 due to restrictions on the mounting space and working space in the shield machine 90.
Because it must be installed so that it protrudes into the tail part of
This increases the thrust during straight excavation and hinders the turning of the shield machine when constructing curves. Also, since the simultaneous injection pipe 93 needs to be dug, there is a high possibility that the ground around the excavation will be disturbed, and the earth removal amount and backfill injection amount will also increase.

(3) The entrance packing used at the time of start-up has a complicated structure of the simultaneous injection pipe portion, which becomes a projection, as compared with a shield machine without the simultaneous injection pipe 93, and has a reduced water stopping performance. Will be done.

An object of the present invention is to provide a stable supply of backfill injecting material by improving mixing performance, to prevent insufficient cleaning ability and backflow in a backfill injecting apparatus and to prevent clogging caused by them, and to backfill a wider range of formulations. An object of the present invention is to provide a backfilling injection device that can cope with an injection material, and to improve excavation performance by improving a cross section of a simultaneous injection pipe.

[0015]

According to a first aspect of the present invention, there is provided a backfilling injection device for a shield machine used in a shield method or a direct lining method. A simultaneous injection pipe of the grout material for backfill injection provided on the side surface of the portion, an injection means of the hardening material as the grout material for backfill injection connected to the simultaneous injection pipe, and connected to the simultaneous injection pipe. Means for injecting a coagulant as the grout material for backfill injection, and means for stirring the grout material for backfill injection pulled out of the simultaneous injection tube at the end of backfill injection and projecting into the simultaneous injection tube at the time of backfill injection. Each of the injecting means of the hardening material and the injecting means of the coagulant as the grout material for backfilling is provided with an inflow port of the hardening material or the coagulant on the side surface. Injection pipe, a piston that opens and closes the inlet of the injection pipe, and a poppet valve that is provided at the end of a flow path that penetrates the piston in the axial direction and that normally closes the end of the piston, A cleaning liquid supply device connected to the rear end side of the flow path, and further, a stirring means of the grout material for injection is formed by a screw,
The simultaneous injection pipe is characterized by comprising a flat pipe that is flat in an outer peripheral direction of the shield machine.

According to a second aspect of the present invention, the cleaning liquid supply device is configured to supply a hydraulic cleaning liquid capable of opening the poppet valve.

The invention according to claim 3 is characterized in that a check valve is provided in the middle of a flow path provided in the piston.

The backfill injection device of the shield machine according to the present invention has the following operation.

(1) Since the piston also functions as a check valve, the backfilling material is prevented from being solidified and blocked by the counterflow.

(2) Since the piston forcibly removes the back-filling filling material adhering to each of the A-solution and B-solution filling tubes, the inside of the tubes is effectively cleaned.

(3) Since the height of the shield machine is suppressed by flattening the simultaneous injection pipe, the entrance packing is simplified. In addition, the resistance reduction and the amount of digging during curve propulsion are reduced.

(4) Since the two liquids A and B are forcibly mixed by the stirring screw, the tail void is filled with the backfill injection material of stable quality.

[0023]

Embodiments of the present invention will now be described with reference to the drawings. The embodiment is merely an example, and it goes without saying that various changes or improvements can be made without departing from the spirit of the present invention.

FIG. 1 is a schematic diagram for explaining the overall configuration of a shield machine 60 provided with a backfilling injection device 50 of the present invention. The backfilling injection device 50 is provided at a tail portion of the shield machine 60. ing.

In FIG. 1, reference numeral 1 denotes a skin plate of a shield machine 60, and a backfill injection device 50 is provided on the skin plate 1. Backfill injection device 50
Is connected to the simultaneous injection pipe 2 of the grout material for backfill injection, the telescopic jack 8 provided on the tip side of the shield machine 60 of the simultaneous injection pipe 2, and the vicinity of the telescopic jack 8 of the simultaneous injection pipe 2. An injection tube 3 for injecting a hardening material (liquid A) as a grout material for filling and injecting a coagulant (liquid B) as a grout material for back filling and connected adjacent to the injection tube 3. A hydraulic cylinder 5 for vertically moving a piston 9 incorporated in the injection pipe 3; a hydraulic cylinder 6 for vertically moving a piston 9-2 incorporated in the injection pipe 4; And a stirring screw 23 protruding from the inside and pulled out from the simultaneous injection tube at the end of backfill injection.

In FIG. 1, reference numeral 3A denotes a liquid A inlet pipe, 4B denotes a liquid B inlet pipe, 20 and 20-2 denote cleaning liquid inlets, 35 denotes a waste liquid recovery pipe, 36 denotes a waste liquid recovery tank,
7, 38 and 39 indicate pressure sensors.

FIG. 2 shows the configuration of a specific embodiment of the backfill injection device 50 shown in FIG. 1. FIG. 3 (a) is a cross-sectional view taken along the line A--A in FIG. b) is BB in FIG.
FIG. 4 shows a cross-sectional view along the line.

As shown in FIGS. 2, 3 (a) and 3 (b), a simultaneous injection pipe 2 which is flat in the direction of the propulsion axis of the shield machine is provided on the skin plate 1 at the shield machine tail. . Two injection pipes 3 and 4, two double-acting hydraulic cylinders (hereinafter simply referred to as hydraulic cylinders) 5 and 6, and a stirring screw 23 are attached to the lower part of the flat simultaneous injection pipe 2. ing. A simultaneous injection pipe 2 is provided at one end on the left side of the simultaneous injection pipe 2 (on the side of the shield machine 60).
A telescopic jack 8 for removing the backfill injection material adhered to the inside is mounted.

A piston 9 is provided in the injection pipe 3. The piston 9 mainly includes a flow path 9A provided in the axial direction of the piston 9, a poppet valve 10 attached to a distal end portion of the flow path 9A, and a spring for urging the poppet valve 10 to close the flow path 9A. 11, restraint ring 12,1
3, collar 14, spacer 15, seals 16, 17,
And it is constituted by a steel ball 18 for backflow prevention provided in the flow path 9A. In addition, an inlet 34 for a backfill injection material for injecting the A liquid is opened on a side surface of the injection pipe 3. The seal 17 seals the sliding portion of the piston 9 and is housed in a rising pipe by a screw-in type lid 19. The lower part of the piston 9 is provided with a hydraulic cylinder 5 installed in parallel with the injection pipe 3 via a connecting plate 32.
Is linked to Reference numeral 20 denotes a water inlet for the cleaning liquid at the lower end of the flow path 9A, and reference numeral 22 denotes a water inlet.

The configuration of the injection pipe 4 is the same as the configuration of the injection pipe 3. A piston 9-2 is provided in the injection pipe 4, and a poppet valve 10-2 is provided at the tip of the piston 9-2. Is provided. FIG. 2 shows a state in which the piston 9-2 is raised by the hydraulic cylinder 6. In this state, a space 21 is provided between the piston 9-2 and the injection pipe 4.
Is formed. When the piston 9-2 is raised, the inflow port 34 of the backfill injection material for injecting the liquid B is closed by the side surface of the piston 9-2. 20-2
Denotes a water inlet for the cleaning liquid at the lower end of the flow path 9A, and 22 denotes a water inlet.

The injection of the cleaning liquid will be described using the injection tube 3. When the cleaning liquid is pumped from the water injection port 20 at the lower end of the piston 9, the cleaning liquid pushes up the backflow preventing steel ball 18, and then pushes the poppet valve 10 overcoming the repulsive force of the spring 11, and the poppet valve 10 and the collar 14
And vigorously blows out from the gap to wash the inner surface of the injection tube 3. In order to inject the cleaning liquid in all directions, the poppet valve 10 must be moved up and down smoothly. The restricting rings 12 and 13 are inserted to smoothly move the poppet valve 10 up and down. The restricting rings 12 and 13 always move the poppet valve 10 straight up and down inside the piston body 9. The restraining rings 12 and 13 are provided with holes of an appropriate size, and do not prevent passage of the cleaning liquid. Also, the poppet valve 10 rises too much,
If the gap between the spacers 15 and 13 cannot be maintained properly, the injection pressure of the cleaning liquid decreases, so that the spacer 15
, So that the poppet valve 10 is prevented from rising too much.

The backflow and clogging of the backfill injection material into the piston 9 is very unlikely to occur because the inside of the piston 9 is always filled with the cleaning liquid by the seals 16 and 17 and the backflow preventing steel ball 18. . Even if the backfill injection material flows into the piston 9, it is diluted by the cleaning liquid. In addition to this, when the piston 9 changes from the extended state to the contracted state, the cleaning liquid stored in the space 21 passes through the water passage hole 22 and the inside of the piston 9, so that the dirty cleaning liquid inside the piston 9 is removed. The gas is forcibly discharged from the gap between the poppet valve 10 and the collar 14 into the simultaneous injection pipe 2.

With respect to the above-described injection of the cleaning liquid, the injection pipe 4
Since the operation is exactly the same also in the above, description of the injection tube 4 side is omitted.

Next, the structure of the stirring means will be described.
The stirring means shown in FIG. 2 and FIG.
3, rotating shaft 24 with gears, middle cylinder 25, gear box 2
6, high-speed rotation motor 27, and bearing lubrication device 28
It is composed of A seal 30 is provided on the sliding portion of the middle cylinder 25.
Are inserted, and the outer cylinder 33 is
Is attached to the end. The stirring screw 23 is screwed and fixed to a rotating shaft 24 with a gear. A seal 29 is fitted on the sliding surface of the base of the stirring screw 23 with the outer cylinder 33 to prevent the oil film from being retained and water, earth and sand from entering. The middle cylinder 25 is a gear box 26
Through the hydraulic cylinder 7 installed in parallel with the outer cylinder 33.

Here, the operation of the backfill injection device 50 configured as described above will be described with reference to schematic configuration diagrams shown in FIGS. In this schematic configuration diagram, only main components are shown.

(1) State Before Injection Starts (FIG. 4) When backfill injection is stopped, the telescopic jack 8 is in an extended state, and groundwater is poured from the injection port side of the backfill injection material of the simultaneous injection pipe 2 and poured. Immediately after, backflow of the backfill injection material is prevented. Also, the pistons 9, 9- in the injection pipes 3, 4
Both 2 are located at the top of the full stroke by their respective hydraulic cylinders 5,6. In this state, the pistons 9 and 9-2 are both connected to the liquid A and liquid B
The inflow ports 34 of A and 4B are closed. Therefore, in this state, both the pistons 9 and 9-2 prevent backflow from the simultaneous injection pipe 2 into the injection pipes 3 and 4, and stop valves for the A and B liquids flowing into the injection pipes 3 and 4. Functioning as

The stirring screw 23 is located at the lower part of the entire stroke by the hydraulic cylinder 7 and does not project into the simultaneous injection pipe 2.

(2) State at the Start of Injection (FIG. 5) When backfill injection is started, first, the telescopic jack 8 is contracted, and then the piston 9 in the injection pipe 3 is completely lowered by the hydraulic cylinder 5. In this state, the inflow port 34 of the injection pipe 3A for the liquid A is opened, and the injection of the liquid A into the simultaneous injection pipe 2 is started. At this time, the injection pipe 4
The piston 9-2 is located at the top of the entire stroke by the hydraulic cylinder 6, and the piston 9-2
The inflow port 34 of the liquid injection pipe 4B is closed. Further, the stirring screw 23 is located at the lower part of the entire stroke by the hydraulic cylinder 7 and does not protrude into the simultaneous injection pipe 2.

(3) A state after a predetermined time from the start of the injection (FIG. 6) After the solution A has sufficiently flowed into the simultaneous injection pipe 2, the injection pipe 4
The required amount of the piston 9-2 is lowered by the hydraulic cylinder 6, and the injection of the liquid B is started. The required amount is
The cross-sectional area of the inlet 34 of the liquid B injection pipe 4B means a stroke of the piston 9-2 such that a flow rate suitable for the composition of the backfill injection material to be used can flow.

Simultaneously with the start of the injection of the liquid B, the stirring screw 23 is pushed out into the simultaneous injection pipe 2 by the hydraulic cylinder 7 and is rotated at a high speed by the motor 27 via the gear box 26. As a result, both the liquid A from the injection pipe 3 and the liquid B from the injection pipe 4 are sufficiently mixed in the simultaneous injection pipe 2 by the stirring screw 23 to be injected.

(4) State when Injection is Stopped (FIG. 7) To stop backfill injection, first, the piston 9-2 is raised by the hydraulic cylinder 6, the inlet B of the liquid B is shut off, and the simultaneous injection pipe is closed. The injection of the liquid B into the liquid 2 is stopped, and the backflow of the liquid A is prevented. Next, the piston 9 is raised by the hydraulic cylinder 5, the liquid A inlet 34 is shut off, and the injection of the liquid A into the simultaneous injection pipe 2 is stopped. As shown in FIG. 7, the stirring screw 23 is rotated for a while, and the backfill material is repelled by the centrifugal force of the stirring screw 23. After this state has continued for a while, the stirring screw 2
3 is stored inside the outer cylinder 33 by the hydraulic cylinder 7. Finally, the telescopic jack 8 is extended, and the backfill injection material remaining in the simultaneous injection pipe 2 is pushed into the tail void, thereby completing the backfill injection. This state is the state shown in FIG.

(5) State of Cleaning Inside Backfilling Apparatus (FIG. 8) When cleaning the inside of the backfilling injection apparatus, the telescopic jack 8 is kept extended and each piston 9, 9
The cleaning liquid is sent into the flow paths 9A and 9A-2 from the water injection ports 20 and 20-2 provided at the lower end of 9-2, and the respective poppet valves 10 and 10-2 are pushed up by the pressure of the cleaning liquid to simultaneously wash the cleaning liquid. It is injected into the injection tube 2.

When the simultaneous injection tube 2 is filled with the cleaning liquid,
The washing is performed by rotating the stirring screw 23 in the stored state. Finally, the injection of the cleaning liquid from the pistons 9 and 9-2 and the rotation of the stirring screw 23 are stopped, and the telescopic jack 8 is contracted. The waste liquid after washing is collected in the pipe 35 (see FIG. 1) by the contraction of the telescopic jack 8, and the waste liquid recovery tank 3 in the shield machine is collected.
6 (see FIG. 1).

After the above-described cleaning step is completed, the telescopic jack 8 is extended again to prevent the backflow of the backfilling injection material immediately after the groundwater and the backfilling injection material from the inlet of the backfilling injection material of the simultaneous injection pipe 2.

(6) Treatment at the time of injection pressure increase In FIG.
When the pressure inside the backfilling injection device 50 increases, this state is detected as a precursor of the occlusion by the pressure sensors 37, 38, and 39 provided in the respective injection tubes 3, 4 and the simultaneous injection tube 2. In this case, by immediately executing the above-described injection stop procedure and cleaning procedure, it is possible to prevent the backfill injection apparatus 50 from being blocked.

[0046]

According to the present invention, (1) since the piston also functions as a check valve, it is possible to prevent solidification and blockage of the backfill material due to backflow. (2) The piston can forcibly remove the backfill injection material adhering to each injection pipe of the liquid A and the liquid B, so that the pipes can be effectively cleaned. (3) Since the simultaneous injection pipe is configured flat, the height of the shield machine can be suppressed, so that the entrance packing can be simplified, and furthermore, the resistance and the amount of digging during curve propulsion can be reduced. (4) Both the A and B liquids can be forcibly mixed by the stirring screw, so that the backfill filling material of stable quality can be filled. Therefore, the present invention can perform simultaneous injection without blocking the backfill injection device, and can greatly reduce the maintenance and repairing steps such as cleaning and replacement of the simultaneous injection pipe and the injection pipe, thereby reducing the construction cost. Can be reduced.
Further, since the tail void can be filled at an early stage with the backfilling injection material having a stable quality, the amount of road surface settlement and the amount of water leakage into the tunnel can be reduced, and the safety and quality can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a shield machine including a backfill injection device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a main part of an embodiment of a backfill injection device of the shield machine of FIG. 1;

3A is a cross-sectional view taken along line AA of the backfill injection device of FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB of the backfill injection device of FIG.

FIG. 4 is an explanatory view showing a state before the injection of the backfill injection device of the shield machine according to the present invention.

FIG. 5 is an explanatory view showing a state at the start of injection in which only the A liquid is injected in the backfill injection apparatus of the shield machine of the present invention.

FIG. 6 is an explanatory view showing a state at the time of injecting both the A liquid and the B liquid in the backfill injection apparatus of the shield machine of the present invention.

FIG. 7 is an explanatory diagram showing a state when injection is stopped in the backfill injection device of the shield machine of the present invention.

FIG. 8 is an explanatory view showing a state at the time of internal cleaning in the backfill injection device of the shield machine of the present invention.

9 (a) is an overall configuration diagram showing a configuration of a conventional shield machine provided with a back-filling injection device, and FIG. 9 (b) is a cross-sectional view of a portion of the back-filling injection device of FIG. 9 (a).

FIG. 10 is a diagram showing a configuration of a backfill injection device of a conventional shield machine.

[Explanation of symbols]

 Reference Signs List 1 skin plate 2 simultaneous injection pipe 3 injection pipe 4 injection pipe 5 hydraulic cylinder 6 hydraulic cylinder 7 hydraulic cylinder 8 telescopic jack 9 piston body 9-2 piston body 10 poppet 10-2 poppet 11 spring 12 restraining ring 13 restraining ring 14 Collar 15 Spacer 16 Seal 17 Seal 18 Backflow prevention steel ball 19 Screw-in lid 20 Water inlet 20-2 Water inlet 21 Space 22 Water inlet 23 Stirring screw 24 Geared rotary shaft 25 Middle cylinder 26 Gear box 27 High-speed rotating motor 28 Bearing Refueling device 29 Seal 30 Seal 32 Connecting plate 33 Outer cylinder 34 Backfill filler inlet 35 Waste liquid recovery pipe 36 Waste liquid recovery tank 37 Pressure sensor 38 Pressure sensor 39 Pressure sensor 40 Screw-in lid

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Koichiro Nakamura 4- 13-13 Akasaka, Minato-ku, Tokyo Inside Kyowa Exio Corporation (72) Inventor Ichiro Ogoshi 4--13-13 Akasaka, Minato-ku, Tokyo (56) References JP-A-3-8997 (JP, A) JP-A-2-62205 (JP, A) JP-A-4-37698 (JP, U) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) E21D 11/00

Claims (3)

(57) [Claims] 1. A backfilling injection device for a shield machine used in a shield method or a direct hitting lining method, wherein a simultaneous injection pipe of a grout material for backfill injection provided on a side surface of a tail portion of the shield machine. And a means for injecting a hardening material as the backfill grout material connected to the simultaneous injection pipe; and a means for injecting a coagulant as the backfill grout material connected to the simultaneous injection pipe, Means for projecting into the simultaneous injection pipe at the time of backfill injection and stirring the grout material for backfill injection pulled out from the simultaneous injection pipe at the end of backfill injection, and injecting a hardening material as the grout material for backfill injection Each of the means and the injecting means for the coagulant includes an inject pipe having an inlet for a hardening material or a coagulant on a side surface, a piston for opening and closing the inflow port of the inject pipe, A poppet valve that is provided at the tip of a flow path that penetrates the piston in the axial direction and normally closes the tip of the piston, and a cleaning liquid supply device connected to the rear end of the flow path Wherein the stirring means for the grouting material for injection is constituted by a screw; and the simultaneous injection pipe is constituted by a flat tube which is flat in an outer peripheral direction of the shield machine. 2. The backfill injection device for a shield machine according to claim 1, wherein the cleaning liquid supply device supplies a cleaning liquid having a hydraulic pressure capable of opening the poppet valve. 3. The check valve according to claim 1, wherein a check valve is provided in the middle of a flow path provided in the piston.
Or a backfill injection device for a shield machine according to claim 2.