JP2002147178A - Soil removal apparatus for tunnel excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil removal apparatus for a tunnel excavator capable of removing soil in a closed mode under a geological condition where a large amount of high pressure spring water comes out and in an open mode under the geological condition where only a small amount of spring water comes out. SOLUTION: A soil removal apparatus 7 of the tunnel excavator 1 comprises a first screw conveyor 50, a second screw conveyor 52, a debris storing pressure vessel 53 or the like, during the excavation in the closed mode, the first gate 59 is closed, the second gate 66 is opened, the debris storing pressure vessel 53 is filled with water, after the start of the excavation, the excavated debris M is separated from pressure water in the pressure vessel 53 and discharged from a gate 70, the pressure water is circulated to the facing thereby suppressing the springing of the pressure water; at the time of excavation in open mode, the first gate 59 is opened and the second gate 66 is closed, and the excavated debris M is exhausted from a first belt conveyor 50 to the belt conveyor 51 through the first gate 59.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth removal device for a tunnel excavator, and more particularly to an earth removal device capable of excavating in a closed mode in which excavation is performed without releasing pressure water discharged from a face.

[0002]

2. Description of the Related Art A tunnel excavator is used to excavate a tunnel by using a shield method when a geological condition is a gravel ground or a bedrock. The tunnel excavator is provided with an earth discharging device for discharging the excavated soil excavated from the face to the outside. As the earth discharging device, an earth discharging device generally including a screw conveyor and a belt conveyor is provided. Adopted.

[0003] In the case where spring water does not generate much from a face, a tunnel can be excavated in an open mode by using the above-mentioned earth removal device. However, when a large amount of pressure water flows from the face, excavation cannot be performed in the open mode using the above-described earth removal device. In such a case, in the related art, excavation is performed while forming a drainage passage by boring the ground in front of the face, or a plurality of injection holes are bored in the face, and mortar or the like is injected from the plurality of injection holes. A technique is employed in which excavation is carried out in a state where the pressure water is prevented from flowing out and solidified, and every time a predetermined length of excavation is excavated, the boring and mortar injection are repeated while excavating.

[0004] On the other hand, when the geological condition is gravel soil with a lot of mud, etc., there is also known a technique of applying a muddy-type soil discharging device to excavate spring water from a face without opening to the atmosphere. Is widely applied to shield tunneling machines that dig tunnels underground in urban areas.

[0005]

When the geological condition is a gravel ground or a bedrock and a large amount of high-pressure spring water comes out, it is almost impossible to apply the above-mentioned muddy-type earth removal device. Even if a muddy-type earth removal device can be applied, the mud drainage pipe must be extended long inside the tunnel, or a muddy water treatment plant for maintaining pressure during initial excavation must be installed at a high position. However, there is a problem that the cost of the equipment is expensive, and the abrasion of the exhaust pipe becomes severe.

[0006] The excavation by mortar injection described above results in low excavation efficiency, and the cost of boring and mortar injection becomes high. As described above, in the conventional tunnel excavator, there is no proposal for an earth removal device which can be switched between the open mode and the closed mode and which is excellent in economy. An object of the present invention is to discharge soil in a closed mode when a large amount of high-pressure spring water comes out,
Another object of the present invention is to provide an unloading device for a tunnel excavator capable of unloading in an open mode when spring water is not a problem.

[0007]

According to a first aspect of the present invention, there is provided a tunnel excavator for excavating a tunnel by rotating a cutter head to excavate a tunnel. A first screw conveyor to be taken out from the vicinity, a belt conveyor for conveying the excavated waste to the discharge side in the tunnel, and a shear storage pressure container capable of receiving the excavated waste conveyed by the first screw conveyor together with the pressurized water. And a second screw conveyor for transporting the pressurized water received from the first screw conveyor and the excavated debris into the debris storage pressure vessel.

In a geological condition in which a large amount of spring water springs from the face, excavated debris excavated by the cutter head is taken out from the vicinity of the back of the cutter head by the first screw conveyor and passed through the second screw conveyor. After excavating the tunnel for one ring or one-half ring (one stroke or one-half stroke) and excavating the tunnel, the excavated waste is belted from the shear storage pressure vessel. The sheet is discharged to a conveyor and conveyed to the discharge side by the belt conveyor.

During excavation, the shear pressure storage vessel can be maintained in a closed state that does not open to the atmosphere, so that pressure water does not squirt into the pit, and a good pit environment and work safety can be ensured. In the case of geological conditions where spring water from the face does not pose a problem, the second screw conveyor and the pressure container for storing the waste are kept in a function stop state, and the inside of the first screw conveyor is opened to the atmosphere and opened. State
Excavation waste is discharged from the first screw conveyor to the belt conveyor.

[0010] According to a second aspect of the present invention, there is provided an unloading device for a tunnel excavator.
In the invention of claim 1, a screen means for separating pressurized water from excavation waste is provided in the waste storage pressure vessel. In the waste storage pressure vessel, the pressurized water can be separated from the excavated waste by the screen means, and only the excavated waste can be supplied to the belt conveyor.

According to a third aspect of the present invention, there is provided an unloading device for a tunnel excavator.
In the invention according to claim 2, a water storage tank for storing pressure water discharged from the shear storage pressure vessel, a reflux pump and a pressure water return passage for returning the pressure water in the water storage tank to the face are provided. It is characterized by having. The pressure water separated from the drilling waste by the waste storage pressure vessel is stored in the water storage tank while maintaining the pressure of the pressure water, and then returned to the face through the pressure water return passage by the return pump by the return pump. Therefore, excavation can be performed while the pressure of the face is maintained at a high level, and the outflow of pressure water from the face can be minimized.

[0012] According to a fourth aspect of the present invention, there is provided an unloading device for a tunnel excavator,
In the invention of claim 2, a first gate for taking out excavation waste is provided on the first screw conveyor, and a second gate capable of blocking a transfer passage in the conveyor is provided on the second screw conveyor, An open mode in which excavation waste is discharged from a first screw conveyor to a belt conveyor with the first gate opened and the second gate closed, and an excavation slide with the first gate closed and the second gate opened. Is transported together with the pressure water from the first screw conveyor through the second screw conveyor into a shear storage pressure vessel, and in the shear storage pressure vessel, the pressure water separated from the drilling waste is stored in a water storage tank and a reflux pump. And a closed mode in which the pressure is returned to the face by the pressure water return passage.

The open mode is selected when almost no spring water comes out from the face, and the closed mode is selected when a large amount of pressure water comes out from the face. In the open mode, the excavation waste is discharged from the first screw conveyor to the belt conveyor while the first gate provided on the first screw conveyor is opened and the second gate provided on the second screw conveyor is closed, The sheet is conveyed to the discharge side by the belt conveyor.

In the case where a large amount of pressurized water flows out of the face, the first gate is closed and the second gate is opened,
The excavation waste is transported together with the pressure water from the first screw conveyor through the second screw conveyor into the shear storage pressure vessel, supplied from the shear storage pressure vessel to the belt conveyor, and transported to the discharge side by the belt conveyor. I do.
In the closed mode, the pressure water separated from the excavation waste in the waste storage pressure vessel is stored in the water storage tank while maintaining the pressure state, and the pressure water is returned to the face by the return pump and the pressure water return passage.

According to a fifth aspect of the present invention, there is provided an unloading device for a tunnel excavator,
The invention according to claim 1 or 2, wherein the pressure storage container for debris is provided with a gate means for taking out the excavated debris therein into a belt conveyor.
Therefore, every time one or one-half ring of the tunnel is excavated, the excavation waste in the waste storage pressure vessel can be intermittently discharged to the belt conveyor by the gate means.

According to a sixth aspect of the present invention, there is provided an unloading device for a tunnel excavator,
The invention according to claim 4 is characterized in that when excavation is started in the closed mode, a water storage means and a pump means for storing water to be filled in the shear storage pressure vessel are provided.

After excavating in the pressure storage container for debris after excavation in the closed mode, the pressure container for debris storage is almost empty and at atmospheric pressure. Therefore, when starting the next cycle of excavation in closed mode,
The water in the water storage means is filled into the shear pressure storage vessel by the pump means, and excavation is started after maintaining the same pressure state as the pressure water of the face. Therefore, excavation can be started while maintaining the pressure state without releasing the pressure of the pressure water of the face to the atmosphere, and the pressure water can be suppressed from flowing out.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Note that the front, rear, left and right in the excavation direction will be described as front, rear, left and right. As shown in FIG. 1 and FIG. 2, a tunnel excavator 1 includes a cutter head 2, a body member 4 including a body member 3 and various internal members, a cutter driving device 5, and a shield jack 6. , An earth removal device 7 for discharging excavation waste, an erector device 8 for lining a segment on the inner surface of the tunnel, and the like.

First, the structure of the first half of the tunnel excavator 1 will be described with reference to FIG. FIGS. 1 and 2 are drawings connected by dividing lines XX. The cutter head 2 is disposed at the front end of the tunnel excavator 1 and is driven to rotate by a cutter driving device 5. The cutter head 2
A center frame 11 including a center cylinder member 10; an outer peripheral plate member 12 surrounding an outer peripheral portion;
3, a plurality of cutter spokes 14 extending from the center frame 11, a plurality of roller cutters 15 removably mounted on the cutter spokes 14, and a plurality of shear scraping plates 16 arranged in a radial direction. A plurality of cooling water injection pipes 17 for injecting cooling water into the plurality of roller cutters 15 are provided.

Next, the main body structure 4 will be described. The body member 3 is formed of a cylindrical member. Inside the front end of the body member 3, a tapered annular tapered plate 2 engaged with a tapered plate member at the rear half of the outer peripheral plate member 12 of the cutter head 2 is provided.
0 is provided, and inside the front part of the body member 3, a partition wall 22 that forms a chamber 21 behind the cutter head 2 is provided, and an outer peripheral portion of the partition wall 22 is an annular frame 23 including three ring webs. An annular web 24 is provided in the middle of the body member 3, and a tail seal 25 is provided on the inner surface of the rear end of the body member 3.

The center cylinder member 10 is rotatably inserted into the center of the partition wall 22 and is sealed watertight by a seal member. The cutter drum 13 is rotatably accommodated in an annular accommodating portion formed on the partition wall 22, and an earth and sand seal and a bearing are mounted on the inner peripheral side and the outer peripheral side of the cutter drum 13. The partition wall 22 is provided with an air lock 26 for a worker to enter and exit. Further, a pair of left and right retractable hoppers 27 for guiding excavation waste in the chamber 21 toward the screw conveyor 50 is also provided with the partition wall 2.
2 attached.

Next, the cutter driving device 5 will be described. A ring gear 30 is fixed to the rear end of the cutter drum 13, a plurality of cutter drive motors 31 are fixed to the partition wall 22, and a pinion 32 fixed to an output shaft of the cutter drive motor 31 meshes with the ring gear 30.
The plurality of pinions 32 are rotationally driven by the plurality of cutter driving motors 31, and the cutter head 2 can be driven to rotate forward and reverse via the ring gear 30 and the cutter drum 13.

Next, ancillary devices will be described.
For example, a pair of left and right front grippers 40 is provided on the annular frame 23 on the outer peripheral portion of the partition wall 22. When the front grippers 40 are driven to the overhanging side, the vibration of the tunnel excavator at the time of excavating the rock layer is prevented. In addition, the ground excavator 1 can be gripped against the soil pressure acting on the tunnel excavator 1 from the front, and the position of the tunnel excavator 1 can be maintained.

A plurality of shield jacks 6 for generating a digging thrust are arranged on the inner surface of the trunk member 3 in the lengthwise direction thereof with the rod 41 facing rearward and forward. Fixed. A spreader 42 is attached to the tip of the rod 42 of the shield jack 6 via an eccentric metal fitting, and the spreader 42 is brought into contact with the front end of the segment S lining the inside of the tunnel T to generate a reaction force and generate a digging thrust. Let it.

Next, the erector device 8 will be described.
The erector device 8 is a device for lining the segment S on the inner surface of the tunnel T, and is disposed at the center in the longitudinal direction inside the body member 3. The erector device 8 includes an annular movable frame 43, an erector main body 44 mounted on the annular movable frame 43, and a rotation driving unit that rotates the erector main body 44 by rotating the annular movable frame 43. The annular movable frame 43 is rotatably supported by a plurality of idler rollers 45 attached to the annular web 24 side.

Every time the tunnel T is excavated for one ring (one stroke of the shield jack 6), the excavation is stopped.
After switching the front gripper 40 to the overhang state,
The rods 41 of some of the shield jacks 6 are switched to the retracted state, one segment S is assembled there with the erector device 8, and the reaction force of the shield jack 6 is taken there. Next, the rod 41 of the shield jack 6 in the region where another segment S is to be assembled is switched to the retracted state, the segment S is assembled, and the reaction force of the shield jack 6 is taken there. By repeating this one by one, the segments S for one ring are assembled, and then all the shield jacks 6 are assembled.
Is made to function, the front gripper 40 is released, and excavation for the next one ring is started. After lining the segment S on the inner surface of the tunnel T with the erector device 8, a perfect circle holding device 46 for holding the segment S in a perfect circle is also provided behind the erector device 8.

Next, the discharging device 7 will be described with reference to FIGS. The earth discharging device 7 includes a first screw conveyor 50, a belt conveyor 51, a second screw conveyor 52, a shear container pressure container 53, screw container conveyors 54 and 55, pressure water recirculation means 56,
A water storage means 57 capable of storing water and filling the waste storage pressure vessel 53 is provided with a trolley 58 and the like.

The first screw conveyor 50 is disposed so as to be inclined downward and forward, and a front end portion is inserted into the chamber 21. In the middle of the first screw conveyor 50 in the length direction, a first gate 59 for taking out the excavation debris to the outside and a rotation driving unit 61 for rotating and driving the internal screw shaft 60 are provided. The gate 59 is provided with a cylindrical body 6 capable of opening and closing an opening (not shown) for taking out an excavation slip from the first screw conveyor 50 to the belt conveyor 51.
2 is slid by a pair of hydraulic cylinders 63. In the vicinity of the upper end of the first screw conveyor 50, an auxiliary gate 64 similar to a gate valve capable of shutting off the internal conveyance passage is provided.

The belt conveyor 51 extends from near the lower side of the first gate 59 to near the rear end of the carriage 58. The belt conveyor 51 is disposed at the middle stage on the right side in the tunnel T (FIG. 2). 3). The second screw conveyor 52 conveys excavation shears and pressure water received from the first screw conveyor 50 into the pressure vessel 53, and the front end thereof is connected to the first screw conveyor 50, and is continuously fed into the pressure vessel 53. Extends horizontally. The second screw conveyor 52 is provided in the upper half of the internal space of the pressure vessel 53.

A rotary drive unit 65 including a drive motor for rotating the second screw conveyor 52 is provided on the rear end side of the pressure vessel 53, and near the front end of the second screw conveyor 52, the internal conveying passage is shut off. A second gate 66 similar to a possible gate valve is provided. The debris storage pressure vessel 53 is capable of accommodating the pressurized water flowing out to the face together with the excavation debris while maintaining the pressure.
Is set to a size capable of accommodating, for example, excavation debris for one ring or リ ン グ ring of the tunnel T together with the pressurized water.

A pair of in-container screw conveyors 54, 55 are disposed in the lower half of the pressure vessel 53, and these in-container screw conveyors 54, 55 are arranged in series in front and rear. A rotation drive unit 67 including a drive motor for rotating the front screw conveyor 54 is driven by the pressure vessel 5.
3 is provided on the front end side, and the screw conveyor 55 on the rear side is provided.
A rotation drive unit 68 including a drive motor for rotating the pressure vessel 53 is provided on the rear end side of the pressure vessel 53. As shown in FIG. 3, a screen 69 for separating pressurized water from excavation waste is provided in the pressure vessel 53 in a downwardly inclined shape.

Opening / closing gates 70 are provided at the front, center, and rear portions for removing the excavation debris in the pressure vessel 53 to the belt conveyor 51. Each gate 70 is driven by a hydraulic cylinder to open and close the gate lid. Has become.

The front frame 71 and the rear frame 72 of the carriage 58 are integrally formed. The front frame 71 and the rear frame 72 have four sets of idler wheels 73, respectively.
Numeral 8 is configured to roll on the inner surface of the segment S lining the inner surface of the tunnel T and move forward in synchronization with the forward movement of the tunnel excavator 1. The pressure vessel 53 and the belt conveyor 51 are fixedly supported on the carriage 58.

The above-mentioned pressure water recirculation means 56 is means for recirculating the pressure water flowing out of the face into the pressure vessel 53 together with the excavation slip when excavating in the closed mode to the face while maintaining the pressure. The pressure water reflux means 56 is 2
Each set of pressure water recirculation means 56 is provided with a water storage tank 74 (for example, a capacity of 10 m ³ ) provided on the carriage 58,
A drainage return pipe 75 for draining the pressurized water from the pressure vessel 53 to the water storage tank 74, an electromagnetic opening / closing valve 76 provided in the drainage return pipe 75, a return pump 77, and a pressure water pressurized by the return pump 77. A reflux tube 78 for refluxing into the chamber 21
And an electromagnetic on-off valve 79 provided on the return pipe 78.

The water storage means 57 is used to fill the empty pressure vessel 53 containing neither the pressurized water nor the drilling debris with water when the excavation in the closed mode is started, and to make the pressure state. Means. As shown in FIG. 4, the water storage means 57 is provided with a large water storage tank 80 (for example, having a capacity of 150).
m ³ ), piping 81, pump 82 and solenoid on-off valve 8
3 and 84, a supply pipe 85 for supplying water to the water storage tank 80 from outside the tunnel T, an electromagnetic switching valve 86, and the like. The water storage tank 80 has an air discharge port with a relief valve that relieves the internal air in a pressure state when the tank is filled with the pressurized water, and the internal pressure water is supplied to the pressure vessel 5.
3 is provided with a non-return valve-equipped air inlet through which air can be introduced from the outside when filling. The pipe 81 is actually connected to the bottom of the pressure vessel 53. In addition, FIG.
FIG. 9 is an explanatory diagram for explaining the function of the earth discharging device.

As shown in FIG. 4, the pressure water is muddy water. When the concentration of the muddy water becomes too high,
A pipe 87 for supplying water from outside the tunnel T is connected to the pressure vessel 53, and the pipe 87 has an electromagnetic on-off valve 88.
Is also provided.

Next, the operation of the tunnel excavator 1 and the earth discharging device 7 described above will be described with reference to FIGS. In this tunnel excavator 1, when a large amount of high-pressure water flows out from a face, excavation can be performed in a closed state while maintaining the pressure of the pressure water, and this mode is called a closed mode. If the pressure water does not well flow out of the face, excavation can be performed in an open state where the pressure of the chamber 21 is released, and this mode is called an open mode.

When the tunnel T is excavated in the closed mode, the pressure vessel 53 is filled with pressurized water at the start of the excavation of the tunnel T for one ring or 1/2 ring. In this case, as shown in FIG. 4, the first gate 59, the auxiliary gate 64, and the second gate 66 are closed, the on-off valves 76 and 83 are closed, the on-off valves 84 are opened, and the pump 82 is operated to store water. The muddy water stored in the tank 80 is filled into the pressure vessel 53 while being pressurized, and the pressure vessel 53 is filled with pressure water having substantially the same pressure as the pressure of the face spring.
At this time, if the concentration of the muddy water in the pressure vessel 53 is too high, the electromagnetic on / off valve 88 is opened, and an appropriate amount of water is supplied from the pipe 87 to dilute the muddy water.

Next, as shown in FIG.
Is closed, the electromagnetic on / off valves 76, 79, 83, 84 are opened, the auxiliary gate 64 and the second gate 66 are opened, the cutter head 2 is driven to rotate, and the cutting face is excavated while the plurality of shield jacks 6 are extended. The excavated waste M is conveyed together with the pressure water into the pressure vessel 53 by the first and second screw conveyors 50 and 52. In the pressure vessel 53, the pressure water is separated by the screen 69 and flows to the lower part of the pressure vessel 53, and the water is discharged. The water flows from the reflux pipe 75 into the water storage tank 74.
The pressure water in the water storage tank 74 is supplied to the pump 77 and the return pipe 7.
The liquid is returned into the chamber 21 by 8. However, excess pressurized water is supplied to a large water storage tank 80 by a pipe 81 and stored.

In this manner, the tunnel T is excavated, and one ring or one-half ring is excavated, and the pressure vessel 53 is excavated.
When the inside is almost full, the excavation is stopped and the pressure vessel 53
The excavation waste M in the inside is discharged to the belt conveyor 51. In this case, as shown in FIG. 6, the auxiliary container 64 and the second gate 66 are closed, the electromagnetic on-off valves 76 and 79 are closed, and the electromagnetic on-off valves 83 and 84 are open, and the pressure vessel 53 is opened. The pressurized water in the pressure vessel 53 is sent to a water storage tank 80 via a pipe 81 to remove the pressurized water in the pressure vessel 53, and then the electromagnetic on-off valves 83 and 84 are closed. , The belt conveyor 51 is operated, and as shown in FIGS. 7 and 8, the excavation waste M in the pressure vessel 53 is discharged to the belt conveyor 51 while the three gates 70 are sequentially opened. 51
, And is transported from the end of the belt conveyor 51 to a predetermined carriage (not shown) or another belt conveyor (not shown) to be transported outside the tunnel T.

If this time coincides with the assembling time of the segment S, the one-ring segment S is attached to the wall of one tunnel by the erector device 8 in parallel with the discharge of the excavation waste M. Is assembled.
Next, after discharging the excavation waste M in the pressure vessel 53, filling of the pressurized water from the water storage tank 80 into the pressure vessel 53 is performed again, and the excavation of the tunnel T is performed. That is, the tunnel T is excavated in the closed mode by repeating FIGS.

On the other hand, when almost no spring water is generated from the face, tunnel excavation is performed in the open mode. In the case of this open mode, as shown in FIG. 9, all the solenoid on-off valves 76, 79, 83, 84, 88 are closed, the first gate 59 is opened, and the auxiliary gate 64 and the second gate 66 are closed. In this state, tunnel excavation is performed, and excavation waste M is supplied from the first gate 59 to the belt conveyor 51, and is discharged to the outside by the belt conveyor 51 and a carriage (not shown) or another belt conveyor.

According to the present embodiment, when a large amount of high-pressure water springs from the face, a closed mode in which the excavation is performed while maintaining the pressure of the high-pressure water, and when the pressure water hardly springs from the face In the case where the tunnel T is excavated in the closed mode, the excavation waste M is stored in the debris storage pressure vessel 53, and the pressure vessel 53 is not released to the atmosphere. Since the closed state can be maintained, a favorable working environment and working safety in the tunnel T can be ensured without the pressure water spouting into the tunnel T.

Inside the pressure vessel 53, there is provided a screen 69 for separating the pressurized water from the drilling waste M. When excavating in the closed mode, the drilling waste M is separated from the pressure water and the belt is separated from the pressure vessel 53 by a belt. It is discharged to the conveyor 51. Therefore, when the excavation waste M is discharged from the pressure vessel 53, the pressurized water does not blow into the tunnel T, and the inside of the tunnel T is maintained in a favorable working environment.

When the tunnel T is excavated in the closed mode, the pressurized water separated and discharged from the excavation waste M in the pressure vessel 53 is stored in the water storage tank 74 and is returned to the return pump 7.
At 7 the water is returned to the face. Therefore, excavation can be performed while the pressure of the face is maintained at a high level, and the pressure water from the face can be minimized.

When excavating under geological conditions in which pressure water from the face does not well flow out, the first gate 59 is opened, the auxiliary gate 64 and the second gate 66 are closed, and the excavated waste M is removed from the first screw conveyor 50. By discharging to the belt conveyor 51, excavation can be performed in the open mode. In geological conditions where a large amount of pressure water springs from the face, the first gate 5
9 and the auxiliary gate 64 and the second gate 66 are opened, the second screw conveyor 52 is operated, and the excavation waste M is transported to the pressure vessel 53, whereby the excavation can be performed in the closed mode.

When excavating in the closed mode, every time one or one half of the tunnel T is excavated, the excavation waste M is separated from the pressurized water by the pressure vessel 53 and is provided at the lower part of the pressure vessel 53. It can be discharged to the belt conveyor 51 from the three gates 70.

Before starting the excavation in the closed mode,
By filling the pressure container 53 with water from the water storage tank 80 by the pump 82, the pressure container 53 can be maintained at a pressure state similar to the pressure water of the face. Therefore, after the excavation is started, the excavation is performed while maintaining the pressure of the pressure water on the face, so that the pressure water can be suppressed from flowing out.

Next, a description will be given of a modification in which the above-described embodiment is partially modified. 1) As shown in FIG. 10, the screw conveyors 54 and 55 in the container may be omitted in the pressure container 53, and only the second screw conveyor 52 may be provided. In this case, the second
During the tunnel T excavation, the screw conveyor 52 is in the first position.
The excavated waste M conveyed from the screw conveyor 50 is conveyed to the pressure vessel 53, and after excavation, the screen 69
Supplies the excavation waste M separated from the pressurized water to the belt conveyor 51. Further, the screw conveyors 54 and 55 in the container may be provided as one screw conveyor according to the length direction, and the number of gates 70 may be one or more than three.

2) The water storage tank 80 for storing the water to be filled in the pressure vessel 53 and the pump 82 for filling the water may be omitted. In this case, at the start of the excavation in the closed mode, the pressure water at the face is open to the atmosphere. At the beginning of the excavation, a large amount of pressure water springs out, but the pressure water is transported to the pressure vessel 53 together with the excavation waste M. Water does not squirt into the tunnel T. When the pressure water separated from the drilling waste M in the pressure vessel 53 starts to be stored in the water storage tank 74, the pressure water is returned to the face by the return pump 77, the pressure of the face pressure water is maintained, and the pressure water is discharged. Is suppressed.

3) In the excavation in the closed mode,
The repetition from the filling of the pressure vessel 53 with water to the discharge of excavation debris in FIGS. 4 to 7 is desirably performed for each excavation of one ring. In this case, after excavation is completed, drain the pressure vessel 53,
Since the work of discharging the excavation waste M and further filling the pressure vessel 53 with water can be performed in parallel with the construction of the segment S, the work process can be shortened.

4) The two drainage reflux pipes 75 are connected to different pressure water reflux means 56, respectively. You may connect with the water reflux means 56. In this case, the water storage tank 74,
Since the number of the return pumps 77 is reduced, the cost can be reduced and the space inside the tunnel excavator can be saved.

5) The first gate 59 of the above embodiment has a structure in which the cylinder is slidably moved in the length direction of the screw conveyor to be opened and closed. It may be a structure that opens and closes.

[0054]

According to the first aspect of the present invention, during the tunnel excavation, the pressure storage container for shearing can be kept in a closed state without opening to the atmosphere. And work safety can be ensured.
In addition, in the case of geological conditions where spring water from the face does not matter, the second screw conveyor and the pressure container for waste storage are kept in a function stop state, and the inside of the first screw conveyor is opened to the atmosphere and opened. State and excavation
From the screw conveyor to the belt conveyor.

According to the second aspect of the present invention, since the screen means for separating the pressurized water from the excavation waste is provided in the pressure storage container for debris, the pressure water is removed from the excavation waste by the screen means in the pressure storage container for debris. And only the excavation waste can be supplied to the belt conveyor. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, there is provided a water storage tank for storing the pressurized water discharged from the waste storage pressure container,
Since a return pump and a pressure water return passage for returning the pressurized water in the water storage tank to the face are provided, the pressure water separated from the drilling debris in the debris storage pressure vessel is maintained in the water storage tank. Since the water can be returned to the face via the pressure water return path by the return pump after storing, the excavation can be performed while the pressure of the face is maintained at a high level, and the pressure water can be minimized from the face. Other effects are the same as those of the second aspect.

According to the fourth aspect of the present invention, the first screw conveyor is provided with the first gate, the second screw conveyor is provided with the second gate, and the first gate is opened and the second gate is closed. An open mode for discharging excavated waste from a first screw conveyor to a belt conveyor,
With the first gate closed and the second gate open, the drilling debris is removed from the first screw conveyor together with the pressure water from the second screw conveyor.
Closed mode in which the pressurized water separated from excavated waste is conveyed to the face by a water storage tank, a recirculation pump, and a pressure water recirculation passage in the pressure storage vessel for debris storage via the screw conveyor of this type. Since the configuration is such that the switching can be performed alternatively, the following effects can be obtained.

When almost no spring water comes out of the face, the open mode can be selected to perform tunnel excavation. When a large amount of pressure water comes out of the face, the closed mode is selected. Tunnel excavation can be performed. Other effects are the same as those of the second aspect.

According to the fifth aspect of the present invention, the pressure container for storing waste is provided with the gate means for taking out the excavated debris inside the pressure container on a belt conveyor, so that one or one half ring of the tunnel is excavated. Every time, the excavation debris in the debris storage pressure vessel can be intermittently discharged to the belt conveyor by the gate means. The other effects are the same as those of the first or second aspect.

According to the sixth aspect of the present invention, when the excavation is started in the closed mode, the water storage means and the pump means for storing the water to be filled in the pressure storage container are provided in the closed mode. When starting the excavation of the next cycle, the water in the water storage means may be filled into the shear storage pressure vessel by the pump means, and the excavation may be started after maintaining the same pressure state as the pressure water of the face. it can. Therefore, excavation can be started while maintaining the pressure state without releasing the pressure of the pressure water of the face to the atmosphere, and the pressure water can be suppressed from flowing out. The other effects are the same as those of the fourth aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a front half of a tunnel excavator according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a rear half of the tunnel excavator.

FIG. 3 is a rear view of the tunnel excavator.

FIG. 4 is an explanatory diagram illustrating a preparation state of water discharging of a soil removal device before excavation.

FIG. 5 is an explanatory diagram illustrating an operation state of the earth removal device at the time of excavation.

FIG. 6 is an explanatory diagram illustrating a preparation state of water discharge of the earth removal device at the end of excavation.

FIG. 7 is an explanatory diagram illustrating an operation state of the earth discharging device at the time of excavation waste discharge.

FIG. 8 is an explanatory diagram for explaining the operation of the screen of the shear pressure storage container.

FIG. 9 is an explanatory diagram illustrating an operation state of the earth discharging device in the open mode.

FIG. 10 is a diagram corresponding to FIG. 8 according to a modified embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Cutter head 7 Drainage device 21 Chamber 50 1st screw conveyor 51 Belt conveyor 52 2nd screw conveyor 53 Shelf storage pressure vessel 59 1st gate 66 2nd gate 69 Screen 70 Gate 74 Water storage tank 77 Reflux pump 80 Water storage tank 82 Pump T Tunnel S Segment M Drilling waste

Claims (6)

[Claims] 1. A tunnel excavator for rotating and driving a cutter head to excavate a tunnel, comprising: a first screw conveyor for extracting excavation debris excavated by the cutter head from near a back portion of the cutter head; A belt conveyor to be conveyed to a discharge side, a shear storage pressure container capable of receiving excavation debris conveyed by the first screw conveyor together with pressure water, and a pressurized water and excavation debris received from the first screw conveyor. And a second screw conveyor for transporting the pressure into the storage pressure vessel. 2. The apparatus according to claim 1, wherein a screen means for separating pressurized water from the drilling waste is provided in the waste storage pressure vessel. 3. A water storage tank for storing pressurized water discharged from the shear storage pressure vessel, a reflux pump and a pressure water return passage for returning the pressure water in the water storage tank to the face. The device for discharging a tunnel excavator according to claim 2, wherein: 4. The first screw conveyor is provided with a first gate for taking out excavation waste, and the second screw conveyor is provided with a second gate capable of blocking a transfer passage in the conveyor. An open mode in which excavation waste is discharged from the first screw conveyor to the belt conveyor with the gate opened and the second gate closed, and a pressure applied to the excavation waste with the first gate closed and the second gate opened. The second from the first screw conveyor with water
Closed mode in which the pressurized water separated from excavated waste is conveyed to the face by a water storage tank, a recirculation pump, and a pressure water recirculation passage in the pressure storage vessel for debris storage via the screw conveyor of this type. 3. The unloading device for a tunnel excavator according to claim 2, wherein the unloading device is configured to be switchable. 5. The device according to claim 1, wherein the pressure container for storing waste is provided with a gate means for taking out the excavated waste inside the pressure container on a belt conveyor. . 6. The tunnel according to claim 4, further comprising a water storage means and a pump means for storing water to be filled in the shear storage pressure vessel when excavation is started in the closed mode. Excavator earth removal equipment.