JP3308208B2 - Backing material injection tip tube and its use - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip tube for supplying a backfill material used for filling a backfill material in a shield excavation method, a backfill material injection device using the same,
A backfill material injection method.

[0002]

2. Description of the Related Art In a shield method, a backfill material is injected and filled into a gap formed between an outer periphery of an excavator and a wall surface of an excavated ground in accordance with the excavation progress of a shield excavator. We are stabilizing. The backfill used here is, for example, a grout having fluidity that can be pumped and kneaded with cement, sodium silicate and water, and has a required hardness of several minutes to several tens minutes after injection. The recipe has been prepared to initiate curing.

[0003] To fill the backfill material, a steel tip pipe for injection is fixed to the tail of the excavator, and a pressure feeding hose is connected to the rear end of the tip pipe. , Filler grout is supplied. This hose for pressure feeding, for example,
It is connected to a cement milk and water glass mixer supplied from a backfill material pumping device including a tank and a pump for pumping.

In the shield method, during excavation work, excavation and backfilling are performed by an excavator, and then excavation is stopped, and segments of the excavated portion are already assembled.
During this time, backfill injection is stopped. These operations are repeatedly performed to excavate the ground.

[0005]

A conventional tip tube is made of a steel tube, and when the filling operation of the backfill material is interrupted,
The backfill material remaining in the tip tube may harden. In this case, it is necessary to remove the solidified backfill material for the next backfill operation. Then, water was injected from the rear end to wash and clean the inside of the tube, and the residual backfill material in the front end tube was removed to prepare for the next pouring operation. However, since steel pipes are used for conventional tip pipes, the backfill material easily adheres to the inner surface of the steel pipe due to rust and deposits inside the pipe, promoting the solidification of the attached backfill material and bending the inside of the tip pipe. If there is a part or a step, it is difficult to completely clean the inside of the tip tube, and the injection tube is often clogged while continuously used for injection. If the blockage is completely obstructed, it is difficult to remove and clean the tip tube, which sometimes delays the excavation work itself.

[0006] Such a cleaning of the injection tip tube has to be performed manually, requires time, labor and money, and impairs the workability and economy of shield excavation work. further,
Since water is used for washing, it may cause contamination in the downhole, thereby reducing work safety. Occasionally, the shield work itself was delayed due to malfunctions or failures of the cleaning equipment.

[0007] In view of the above-mentioned problems of the injection tip tube, the present invention prevents clogging of the injection tip tube,
It is an object of the present invention to provide a tip tube which can eliminate or reduce the cleaning of the injection tip tube. The present invention also seeks to provide a backfill material injection device for preventing clogging between injection tip tubes. The present invention further seeks to provide a method of injecting a backfill material through a tip tube that can obviate or reduce cleaning of the injection tip tube.

[0008]

The backfill injection tip tube of the present invention has a double pipe structure of an outer pipe and a soft inner pipe whose cross section can be reduced, and usually the backfill material is distributed to the inner pipe. When backfilling is interrupted, the gap between the outer pipe and the inner pipe is pressurized with a pressurized fluid to reduce the cross section of the inner pipe, extrude part or all of the backfill material from the inner pipe, and close it. This makes it possible to eliminate the backfill material from the inner tube and to eliminate or reduce the cleaning of the injection tip tube.

[0009] That is, the backfill injection tube according to the present invention comprises a soft inner pipe capable of reducing the cross section for flowing and closing the backfill, and an outer pipe hermetically surrounding the inserted inner pipe. And a pipe joint connected to the outer pipe for supplying a pressurized fluid to the gap between the inner pipe and the outer pipe.

[0010] The injection tip tube of the present invention is arranged on the outer peripheral side of the tail portion of the shield machine, and the rear end portion is connected to a backing material pressure feeding hose to pump backfill material flowing through the inner tube. When the inside of the outer tube is pressurized by supplying a pressurized fluid between the outer tube and the inner tube, the outer surface is pressed, the cross-sectional area of the inner tube is reduced, the inner tube is closed, and the inside of the tube is closed. The backfill material is discharged, and at the same time, the backflow of the backfill material already filled between the shield machine and the inner wall of the ground is prevented.

In order to resume the backfilling operation, if the backfilling material is started to be pumped and the pressurized fluid is stopped to reduce the pressure in the outer tube, the backfilling material can be quickly and simply restarted. This eliminates the need for conventional cleaning of the inside of the tube to remove the backfill material.

[0012] The present invention provides the above-mentioned backfill material injection tip tube,
A backfill material injecting device comprising a fluid pressurized supply means and a pressurized fluid line connecting the fluid pressurized supply means to the above-mentioned fitting portion of the distal end pipe is included. In this device, a discharge pipe is preferably connected to the pressurized fluid line via an on-off valve. When the on-off valve is closed, the pressurized fluid from the fluid pressurizing supply means is supplied to the pressurized fluid pipe. When the inside of the outer tube is pressurized through the passage, the inner tube is closed and then opened, the pressurized fluid from the fluid pressurizing supply means is released or returned to reduce the fluid pressure, and the outer tube is closed. The inside is returned to a pressure of about the atmospheric pressure to allow the backfill material to flow through the inner tube. In other words, this on-off valve enables the flow of the backfill material in the inner pipe and the closing thereof to be controlled only by the opening and closing operations.

The present invention includes a method for injecting a backfill material using a tip tube fixed to a shield machine and for injecting a backfill material around the tail portion, as described above. The pipe has a double pipe structure consisting of an outer pipe and an inner pipe whose cross section can be contracted. During backfilling work, the process of distributing backfill material inside the inner pipe, and when the backfilling work is interrupted, the outer pipe and inner pipe are The process of pressurizing the gap with the pipe by the pressurized fluid to shrink the cross section of the inner pipe, extruding the backfill material from the inner pipe, and closing the backfill material injection tip pipe is repeated.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION
The inner tube and the outer tube have a double structure. First, the inner tube is preferably made of a soft tube material whose internal cross section is reduced by external pressure. In particular, a tube material which is easily deformed to such a degree that the inner surface of the inner tube subjected to the external pressure comes into contact with the inner surface and becomes flattened is preferable. For such a tube, for example, a soft and thin tube, for example, a tube of a soft synthetic resin or rubber, or a tube of a woven fabric is used.

[0015] The tube material of the inner tube is more preferably a woven tube, and particularly preferably a woven tube in which the inner and outer surfaces of the woven fabric are watertight. In particular, firefighting canvas hoses are the most excellent because they can easily be flattened and have pressure resistance. In order to prevent water leakage of the canvas hose, a suitable waterproofing agent is applied to the inner surface, which is also preferable for smoothing the inner surface since the cloth is filled and smoothed.

The other outer tube may be made of a material having high strength enough to withstand the pressure of the pressurized fluid and withstand the weight of the fluid and the backing material. For example, a normal steel pipe is used.

[0017] The inner pipe and the outer pipe are such that the inner pipe is inserted into the outer pipe, and both ends of the inner pipe are air-tightly joined to the outer pipe. Gap is formed,
A pipe joint communicating with the gap is connected to the outer pipe. The pressurized fluid can be a non-curable fluid such as water or air, but water is most preferred.

[0018] The backfill material injection device of the present invention is a pressurized fluid connecting the fluid pressure supply means to a pipe joint portion formed on the outer pipe of the injection tip pipe, the fluid pressure supply means, and the tip pipe. The pressurized fluid is supplied to the inner side of the outer pipe by connecting a fluid pressurized supply means having a pressurized pump and a pressurized fluid pipe connected thereto to a pipe joint. You. As the pressurized fluid pipe, a pipe such as a rubber hose having a high pressure resistance is simply used.

An on-off valve, for example a discharge valve or a return valve, is connected to the pressurized fluid line in order to regulate the pressure inside the outer tube. The discharge valve or the return valve is pressurized to close the inner pipe, and then the on-off valve is opened to release the fluid to the atmosphere or return to a fluid source, for example, a water tank, so as to reduce the pressure inside the outer pipe. It is used to lower, release the closure of the inner tube and allow the backfill material to flow through the inner tube.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, an example in which a water-tight woven tube whose inner and outer surfaces are used for the inner pipe and water is used as the pressurized fluid will be described below. FIG. 1A shows the structure of an injection tip tube as an example. In FIG. 1A, the outer tube 1 is a steel tube. In this example, a 2.5-inch steel tube is used. An inner end fixing ring 3 for fixing the inner tube is fixed to the inside. The inner tube is inserted into the outer tube, and each end of the inner tube is fixed to the inner surface of the outer tube end.

The inner tube 2 uses a woven tube whose inner and outer surfaces are water-tight because it is easily deformed flat.
The inner tube 2, that is, the woven tube, has its both ends in contact with the inner peripheral surface of the end fixing ring 3 for fixing the inner tube, and the inside of the end of the inner tube is swaged with the fixing ring 31. Thus, it is clamped between the end fixing ring 3 and is firmly fixed. The inner peripheral surface of the end fixing ring 3 is preferably provided with a large number of saw-toothed grooves for preventing the inner tube 2 from slipping. These peripheral grooves are pressed by the fixing ring 31 for caulking. The inner tube 2 is prevented from falling out of the woven tube, and the outer tube and the inner tube can be fixed substantially tightly and strongly at their ends. Can be supplied with pressurized water.

The front end portion 12 of the outer tube 1 is an open end, and the back end portion 11 is connected to a backing material pressure feeding hose 5 to be described later via a connection tube 51 in this example. A short pipe fitting 40 for pressurized fluid is welded and fixed to the outer pipe in the longitudinal direction and in a range in which the inner pipe is inserted, in this example, near the rear end portion 11 so that the outer pipe 1 has an inner pipe. And the pipe joint 40
In this example, a pressurized water supply pipe 41 (usually a medium pressure hose) is connected. Water is supplied from the pressurized water supply pipe 41,
Water can be supplied to the gap 4 between the inner pipe 2 and the outer pipe 1. As described later, the return pipe 42 is joined to the pressurized water supply pipe 41 via a discharge valve V, which is branched on the way.

The flow of the backfill material of the inner pipe and the behavior of closing the inner pipe according to this embodiment will be described. FIG. 1A shows that the backing material pressure feeding hose 5 without pressurizing the gap 4 inside the outer pipe 1. This shows a state in which the backfill material 8 is flowing through the injection tip tube 10 connected to the outer tube, and since the pressure in the gap 4 with the outer tube is released, the backfill material 8 supplied from the pressure feeding hose is shown. The inner tube 2 is expanded by the pressure while expanding the inner tube 2 which is a woven tube.
Through the inside 20 of the excavator, and is filled from the tip portion 12 to the gap on the ground side of the excavator tail.

FIGS. 1B and 1C show that the pressurized water from the pressurized water supply pipe 41 is supplied to the gap 4 between the inner pipe 2 and the outer pipe 1 to pressurize the woven tube of the inner pipe. This figure shows the state of the distal end tube pressed flat, and the back padding material 8 is pushed out by the pressure contact of the inner tube 2, and is closed in a state where the inner surfaces are in contact with each other and deformed flat. In this state, the backfill material 8 does not flow backward from the distal end tube 10 even if the pressure feeding hose 5 of the backfill material is removed from the rear end portion 11.

To resume the backfilling operation, the pressure inside the outer tube 1 can be reduced so that the inner tube 2 can be fed at any time by reducing the pressure inside the outer tube 1. While expanding from the inside 20, distribution of the backfill material can be started, and the backfill work can be continued.

The above example shows an example in which the inner tube 2 receives the external pressure of the pressurized water, and the inner surfaces thereof are pressed against each other and deformed to have a flat cross section. Although it is deformed, the degree that the cross section of the inner side 20 of the inner tube shrinks may be sufficient. Even if the backing material accumulated in the shrinked inner tube is solidified, it will be pressure-fed when resuming the backing work. Since the inner pipe expands and expands under the pressure of the backfill material 8, a gap is easily formed between the inner pipe and the solidified backfill material. Is also extruded from the inner tube, so that the backfill material can be easily distributed thereafter. As described above, in order to facilitate the extrusion of the solidified residual backfill material, the back surface of the inner tube 2 is preferably subjected to a coating treatment so as to be slippery.

FIG. 2 shows an example in which the backfill material injection tip tube 10 is provided on the circumferential shell 9 of the tail of the excavator. The tail of the excavator protrudes toward the outer peripheral side of the shell 9. An injection tube storage chamber 91 is formed, and the injection tip tube 10 is disposed such that the tip portion 12 is exposed rearward from the storage chamber 91 toward the injection tube rearward. In this arrangement, the injection tip tube 1
0 is connected to the mixing pipe 50 via a one-touch joint 52 as a pipe joint, and the mixing pipe 50 has a supply pipe 53 for cement milk.
a and the water glass supply pipe 53b are connected.

FIG. 2 also shows a pressurized water supply pipe 41 connected to the rear end portion 11 side. The pressurized water supply pipe 41 is connected to a water supply pump, and the pressurized water supply pipe 41 is branched on the way. A return pipe 42 is connected via a return valve V, and the return pipe 42 is connected to a water supply tank T to return water.

FIG. 3A shows an outline of a backfill material injecting device. This device includes a backfill material injecting tip tube 10, a fluid pressurizing / supplying means, and a pipe joint. And a pressurized fluid pipe connecting the fluid pressurized supply means, that is, a pressurized water supply pipe 41. The fluid pressurizing and supplying means includes a water tank T and a pump P driven by a motor M,
The water tank T is pressurized and supplied by the pump P, passed through the pressurized water supply pipe 41, and supplied from the pipe joint portion 40 to the inside of the outer pipe 1, and the inner pipe 2 whose section can be easily reduced (this example) In this case, the outer surface of the woven fabric tube (water-tight inner and outer surfaces) can be pressurized as described above.

The pressurized water supply pipe 41 is branched in the middle and a return pipe 42 is joined via a return valve V. Therefore, when the return valve V is opened, the water inside the outer pipe 1 is returned. Through the pipe 42, the water can be returned to the water tank T, and the water pressure inside the outer pipe 1 can be reduced.

The use of the backfill injection tube 10 and the backfill injector is as follows. During a normal filling operation of the backfill material, the return valve V is opened and, as shown in FIG. When the backfill material 8 that has been mixed and adjusted in the mixer 50 is pressure-fed from the backfill material feed pipe 5, the backfill material 8 flows while expanding the inside diameter 20 of the inner pipe 2, and sequentially flows.
From the tip portion 12, it is discharged to the outside of the tail of the excavator, that is, to the ground side.

Next, the injection of the backfill material 8 is stopped, as shown in FIG.
As shown in the figure, the return valve V is closed, and pressurized water pressurized and supplied by the pump P is supplied through the water supply line 41 to the injection tip pipe 10.
1B, the inner tube 2 is contracted by the pressurized water to discharge the remaining backfill material 8 from the distal end as shown in FIG. As shown in the cross-sectional view, the inner pipe 2 is closed so that the inner surfaces thereof are in close contact with each other.

At the time of stopping the filling of the backfill material, if necessary, valves 53 for cement milk and water glass may be used.
a, 53b can be closed to stop the pumping of the backfill material 8, and then the pumping tube 5 can be separated from, for example, the joint 52 in the middle, so that the inside of the pumping tube can be easily cleaned. In this case, there is no backflow of the backfill material 8 from the ground side, and the injection stop time can be set freely without worrying about clogging in the inner pipe.

The operation of the pump P of the fluid pressurizing / supplying means and, in particular, of the return valve V are performed by an operation panel C for electrically operating the pump motor M and the solenoid of the return valve V. Further, it is preferable that the operation of opening / closing the return valve V and the operation of starting / stopping the backfill material pumping operation are linked, and the operation of the backfill material pumping operation automatically operates the return valve, and thus the inner pipe. Can be automatically controlled.

[0035]

The injection tip tube of the present invention is a soft inner tube whose cross section can be reduced to allow the backfill material to flow and close, and the outer surface of the inner tube is inserted by pressurized fluid through the inner tube. With a double pipe structure consisting of an outer pipe that can be pressurized and hermetically enclosed, the inner pipe of the backfill material can be distributed and closed only by operating the pressure inside the outer pipe, despite its extremely simple structure. In addition, it is possible to prevent clogging of the backfill material inside the pipe, and it is possible to eliminate or reduce complicated work such as clogging and cleaning of the injection tip pipe at the site work of the conventional shield excavator, and stabilize the excavation work And efficiency.

In the injection tip tube and backfill material injection device of the present invention, the pressurized fluid line connected to the fluid pressurizing and supplying means is connected to the outer tube, so that pressurization and depressurization inside the outer tube can be easily performed. The flow and closing of the inner pipe can be made extremely simple only by operating the valve.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a backfill material injection tip tube according to an embodiment of the present invention, in which (A) is a longitudinal sectional view showing a state in which the backfill material flows through an inner tube, and (B) is a longitudinal sectional view. FIG. 3C is a vertical cross-sectional view showing a state in which the tube closes the backing material, and FIG. 3C is a cross-sectional view showing a state in which the inner tube closes the backing material.

FIG. 2 is a view showing a mode of use of a backfill material injection tip tube according to an embodiment of the present invention, which is mounted on an outer peripheral side of a tail portion of a shield machine.

FIG. 3 shows a piping diagram of backfill material injection using a backfill material injection tip tube according to an embodiment of the present invention. (A)
(B) shows a state in which the backfill material flows through the inner tube, and (B) shows a state in which the backfill material is closed by the inner tube.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 back filling material injection tip tube 1 outer tube 2 inner tube 20 inside of inner tube 3 fixing ring 4 gap between outer tube and inner tube 41 pressurized fluid pipeline 5 backing material pumping tube

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumiaki Machi 593 Komagaki, Nagareyama-shi, Chiba Sanken Kiki Co., Ltd. In-house (72) Inventor Arima, etc. Sankyo Building 3F, 1-17-4 Higashikanda, Chiyoda-ku, Tokyo (56) References JP-A-2-128097 (JP, A) JP-A-2-22997 (JP, A) (58) Fields studied (Int. Cl. ⁷ , DB name) E21D 11 / 00

Claims (8)

(57) [Claims] 1. An injection tip tube disposed on the outer peripheral side of a tail portion of a shield machine for injecting a backfill material, wherein the injection tip tube is made of a soft material whose cross-section can be reduced to allow the backfill material to flow and close. An inner tube, and an outer tube that penetrates the inner tube and hermetically surrounds the outer surface of the inner tube so as to be pressurizable by a pressurized fluid,
Characterized in that the cross-section of the double-pipe can have various cross-sections. 2. The injection tip tube according to claim 1, wherein the inner tube is a tube made of a woven fabric whose inner and outer surfaces are water-tight. 3. The injection tip tube according to claim 1, wherein the pressurized fluid is water. 4. The outer pipe according to claim 1, further comprising a pipe joint for supplying a pressurized fluid between the inner pipe and the outer pipe. Injection tip tube. 5. A backfill material comprising: the backfill material injection tip tube according to claim 4; and a pressurized fluid pipe connecting the fluid pressurizing supply means, the pipe joint, and the fluid pressurizing supply means. Infusion device. 6. The backfill material injection device according to claim 5, wherein an on-off valve for filling or discharging the fluid is connected to the pressurized fluid pipeline. 7. A method of injecting a backfill material using a tip tube fixed to a shield machine and for injecting a backfill material around a tail portion, wherein the backfill material injecting tip tube includes the backfill material. The inner pipe has a double pipe structure of a soft inner pipe whose cross section can be reduced and an outer pipe for pressurizing the outer surface of the inner pipe with a pressurized fluid. During backfilling work, the backfill material is circulated in the inner pipe. And when not in use, pressurizing the gap between the outer tube and the inner tube with a pressurized fluid to reduce the cross section of the inner tube, extrude the backfill material from the inner tube, and close the backfill material injection tip tube. A method of injecting a backfill material, wherein the method is repeated. 8. The inner tube according to claim 7, wherein the inner tube is a tube made of a woven fabric whose inner and outer surfaces are watertight, and the pressurized fluid is a non-hardening fluid such as water or air. Injection method.