JP3315676B2 - Jet pump muddy pressurized tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet pump capable of excavating by switching between a jet pump mode suitable for excavating a rock formation and a mud pressurizing mode suitable for excavating a soft formation or a fracture zone. The present invention relates to a pressurized muddy tunnel excavator.

[0002]

2. Description of the Related Art Conventionally, a fluid transport tunnel excavation in which a rock mass is excavated by pressing a ground with a gripper to take excavation reaction force, and excavated by a thrust jack, and the excavated rock mass is carried out by a jet pump system. Machine and
A muddy shield excavator that raises muddy water pressure in the bulkhead chamber, takes excavation reaction force from the assembled segment, excavates with a shield jack in this state, excavates soft geological parts, and discharges excavated waste etc. to the rear It is used according to the geology to be excavated.

[0003] The fluid transport type tunnel excavator can perform high-speed construction because segment assembly is not required at the time of rock excavation. On the other hand, the muddy shield excavator holds a face in a soft geological portion and excavates stably. It is effective to do.

[0004] As this kind of prior art, Japanese Patent Laid-Open No. 9-53 is disclosed.
There is an invention described in Japanese Patent Publication No. 391, and in this invention, excavated materials to be carried out by a jet pump and carrier water are forcibly sucked and hermetically sealed so that excavated materials to be excavated and carried out do not stay in a pipeline. An attempt is made to prevent the discharge pipe from being clogged by temporarily storing the pressure in a decompression tank and reducing the pressure (conventional example 1).

As another conventional technique, Japanese Patent Publication No.
There is an invention described in Japanese Patent No. 2437, and in this invention, by providing a pump system for transporting excavation debris and the like behind a pipe system of a jet pump, excavation debris by a jet pump even when excavation work is performed over a long distance, Dust, spring water, and the like can be efficiently carried backward (conventional example 2).

Further, as another conventional technique, Japanese Utility Model 7-
There is an invention described in Japanese Patent No. 6238. In this invention, the first supply pipe into the chamber and the water for generating negative pressure are supplied to the jet pump so that both the jet pump method and the muddy water pressurization method can be adopted. And a valve for controlling the amount of pressurized water distributed to these supply pipes (conventional example 3).

[0007]

However, the fluid transport type tunnel excavator and the muddy shield excavator as described above are designed so that they can be excavated by an excavation method suitable for each geology. The following issues arise when attempting to excavate geology.

The muddy shield machine requires a segment assembling time for segment propulsion, and is not suitable for high-speed construction on a rock mass. In addition, to excavate with muddy water pressure in the bulkhead chamber,
Extra thrust required for propulsion is required. Furthermore, since the muddy water pressure is built in the bulkhead chamber, it is difficult to rotate the cutter disk at high speed due to the restriction due to the sliding speed of the bearing seal on which the muddy water pressure acts.

On the other hand, in the case of a fluid transport type tunnel excavator, it is difficult to maintain a mud pressure in a bulkhead chamber even in soft geology and a crush zone, so that it is difficult to keep the face and the ground stable. In addition, at the time of face collapse, an auxiliary construction method such as ground improvement is required, resulting in a large time and economic loss. Furthermore, at the time of abnormal springing, springing countermeasures such as draining boring are required.

Therefore, it is difficult for a conventional tunnel excavator or the like to efficiently excavate a stratum in which a bedrock layer, a soft geological stratum, and a fracture zone are mixed.

The same is true for the above-mentioned conventional examples 1 and 2. Excavation by the jet pump method is possible, but excavation by the muddy water pressurization method is not possible.
Further, in Conventional Example 3, both the jet pump system and the muddy water pressurization system can be adopted. However, a description of a specific configuration provided at the rear of the excavator body in order to perform efficient excavation work is described. Absent.

[0012] Therefore, a tunnel excavator capable of efficiently excavating a stratum in which such a bedrock layer, a soft geological stratum, a crush zone and the like are mixed has been desired.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a suction port having a jet pump for discharging drilling debris into a bulkhead chamber, and the suction port is provided in a jet pump mode. And the muddy water pressurization mode is configured to be switchable, on the excavator body or the rear bogie, at the time of the jet pump mode , an unloading conduit for unloading excavation slips in the bulkhead chamber from the suction port,
An air release tank for temporarily storing the removed drilling waste, a discharge pump for carrying out the drilling waste from the air release tank, and a water supply pipeline for supplying water to the jet pump are provided. An unloading conduit for unloading excavation waste in the bulkhead chamber from the suction port,
A distributor for distributing water from the removed drilling waste, a discharge pump for transporting the drilling waste from the distributor, and a water supply conduit for applying mud pressure to the bulkhead chamber ; Pipe line switching means to switch between water supply pipes
Excavator body or the said discharge conduit and water supply channel capable constitutes switched between the jet pump mode and mud pressure mode is provided on the rear bogie, bulkhead from the air vent tank
A conduit leading into the chamber is provided, and the conduit is
Can be used for cutter cooling water line in pump mode
It is sea urchin.

According to this structure, the suction port in the bulkhead chamber of the tunnel excavator and the outlet pipe and the water pipe (mud pipe) are switched by the pipe switching means so that, for example, the starting section When the tunnel is excavated in a hard rock geological area and the middle part is a soft geological part (for example, the sea floor), the high-speed construction is performed in the start part and the reaching part in the jet pump mode, and the muddy water is used in the middle part. By the pressurization mode, the face can be kept stable, and the spring from the face can be stopped to perform stable excavation, and tunnel excavation having both advantages can be performed. As a switchable structure of the sending / discharging pipe, means for changing pipes or providing a switching valve for operation is adopted. In addition, air release tank
Pipes leading into the bulkhead chamber from the
Used as a cutter cooling water line in the pump mode
To use the same pipeline effectively.
Efficient use of space inside the tunnel excavator
Can be

[0015] A bypass line is provided between the discharge line and the water supply line in the jet pump mode, and a bypass line is provided between the discharge line and the water supply line in the muddy water pressurization mode. If a circulation flow before excavation can be formed by these bypass conduits, the flow velocity in the water supply conduit can be increased before excavation, and the water pump can be stabilized.

[0016]

Furthermore, even if a conduit is provided from the distributor to the bulkhead chamber, and this conduit can be used as a mud circulation circuit in the mud pressurization mode, the same conduit is effectively used. The space inside the tunnel excavator that is narrow and narrow can be used effectively.

In addition, in each of the jet pump mode and the muddy water pressurizing mode, when the drilling waste is clogged in the drainage pipe, the water supply pipe and the discharge pipe are switched to form a blockage elimination line to eliminate the blockage. With this configuration, even if the excavation debris is clogged in the pipe, the debris that has been blocked can be easily opened.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a front part of a tunnel excavator showing one embodiment of the present invention, and FIG.
The figure which shows the suction port (A part) of the tunnel excavator shown in FIG.
(a) is a sectional view showing a suction port in a jet pump mode, and (b) is a sectional view showing a suction port in a muddy water pressurization mode.

As shown in FIG. 1, a plurality of roller cutters 2a are provided on a cutter head 2 provided at a front portion of the excavator body 1, and the roller cutter 2a excavates and enters a bulkhead chamber 3. A suction port B is provided at a lower portion of the chamber to carry out the taken in bedrock, earth and sand, spring water, and the like (hereinafter referred to as “digging waste”). This suction port B
On the side of the excavator main body 1, there is provided an unloading duct (drainage pipe) 4 extending to the rear of the excavator main body 1.

As shown in FIGS. 2 (a) and 2 (b), the suction port B has a jet pump nozzle 5 provided on the cutter head 2 side and a discharge pipe 4 provided on the excavator body 1 side. When,
Suction nozzles 6 and 7 provided between them are provided. A jet pump P is formed at the jet pump nozzle 5. The suction nozzle 6 in the jet pump mode shown in (a) is formed by a T-shaped pipe 6b with the opening 6c side of the upper flange 6a, the jet nozzle 5 side and the discharge pipe 4 side open. The suction nozzle 7 in the muddy water pressurization mode shown in FIG.
The opening 7c side and the discharge pipe 4 side are formed by an arcuate pipe 7b which is open.

As shown in FIG. 1, a nozzle 8 for cooling the cutter and a nozzle 9 for the suction port are provided in the bulkhead chamber 3. The water from the cutter cooling nozzle 8 cools the roller cutter 2a during the rock excavation, and the water from the suction nozzle 9 prevents the fluidity of the drilling debris from being deteriorated at the suction port B. .
10 shows an example of a preferable pressurized pipeline in the muddy water pressurizing mode.

FIGS. 3 to 10 show the piping equipment of the tunnel excavator shown in FIG. 1, and show the piping equipment that can be switched in the tunnel excavator described above. The pipelines indicated by thick lines in these drawings are used pipelines in the state of each drawing. FIG. 5 is a piping diagram of an excavated state in the jet pump mode, and the entire configuration will be described based on FIG.

First, the piping used in the jet pump mode will be described. The jet pump P for carrying out the excavation slip is provided below a chamber located on the rear surface of the cutter head 2. Excavation debris conveyed through the front discharge pipe 4 by the jet pump P is conveyed to an air release tank 11 for temporarily storing. In this embodiment, the air release tank 11 is constituted by an open-to-air tank, and the air contained in the excavation waste is released to the atmosphere. A crusher 1 is provided at the entrance of the tank 11.
2 are provided, and the lump in the excavation waste to be thrown into the air release tank 11 from the front discharge pipe 4 is crushed at the time of throwing. The excavation waste from which air has been released from the tank 11 to the atmosphere is discharged from the suction pipe 14 through the rear discharge pipe 15 to the separation facility 16 at the rear by the discharge pump 13. This separation facility 16 is for separating water from earth and sand, or for separating stone and slurry.

The separation equipment 16 has a rear water supply line 1.
7, and a water supply pump 18 is provided in the rear water supply line 17. The rear water supply line 17 is branched in the middle, one of which is a front water supply line 19 leading to the jet pump P, and the other is a rear water supply line 20 leading to the air release tank. The front water supply pipe 19 is provided with a jet generating pump 21 for generating a jet by the jet pump P. The front water supply pipe 19 is provided with pipe switching units 46 and 47.

A water supply pump 18 provided in the rear water supply line 17 is controlled by a signal from a water level gauge (not shown) provided in the air release tank 11. It is controlled to keep it at a predetermined position. Further, the air release tank 11 is provided with a water supply pump 22 that uses the water in the tank for cooling the cutter disk of the cutter head 2 and for supplying the suction port. Water is supplied from the water supply pump 22 to the nozzle 8 for cooling the cutter and the nozzle 9 for the suction port via the front water supply line 23. The front water supply pipe 23 is provided with a check valve 24, a manual open / close valve 25, and a pipe switching unit 48. Further, a bypass pipe 26 is provided between the rear water supply pipe 20 and the rear discharge pipe 15.

The front discharge line 4, the rear discharge line 15, the front water supply line 19, the rear water supply line 20, and the bypass line 26 are provided with remote control valves 27 to 33, respectively. It is configured such that opening and closing can be controlled by a control device (not shown).

On the other hand, a pipe used in the muddy water pressurization mode is provided so as to communicate with the pipe in the jet pump mode described above. Hereinafter, the drainage in the muddy water pressurization mode will be described. A pipe switching section 34 is provided at the crusher input section of the above-mentioned front discharge pipe 4, and a muddy water discharge pipe 35 and a crusher 36 for muddy water are connected to the pipe switching section 34. A distributor 37 is connected to the crusher 36, and a part of the water in the excavation waste is separated from the earth and sand by the distributor 37.
The water is supplied from the muddy water supply pipe 39 to the front part of the check valve 24 of the front water supply pipe 23 and is used as water supply from the circulation pipe 54. 45 is a piping switching unit. The earth and sand is carried out from the discharge pipe 40 to the separation facility 16 through the pipe switching unit 49 and the rear discharge pipe 15 by the discharge pump 41 provided in the discharge pipe 40.

In this embodiment, the muddy water discharge pipe 3
A muddy water bypass pipe 42 is provided for communicating the bypass pipe 5 with the bypass pipe 26 described above, and is connected by a pipe switching unit 43 provided in the bypass pipe 26. Further, a bypass pipe 44 is provided between the muddy water discharge pipe 35 and the above-described front water supply pipe 19. Remote control valves 50, 51, 52 are also provided in the muddy water discharge pipe 35, the muddy water supply pipe 39, and the bypass pipe 44. These pipe switching units 34, 45, 46, 47, 48, 49 constitute a pipe switching means. In this embodiment, in addition to these, remote control valves 27 to 33 and 50 to 52 are used together to constitute a pipeline switching unit.

The pipe switching section 47 of the front water supply pipe 19 and the pipe switching section 48 of the front water supply pipe 23 are provided with:
A pressurizing line 53 and a circulation line 54 leading to the bulkhead chamber 3 are provided, and the muddy water is pressurized from the pressurizing line 53 and the circulation line 54 in the muddy water pressurizing mode. By forming the pressurizing line 53 and the circulation line 54 like the above-described pressurizing line 10 shown in FIG. 1, it is possible to obtain the effect of excavating shear in the bulkhead chamber 3.

FIG. 3 is a piping diagram of the bypass operation state in the jet pump mode, and FIG. 4 is a piping diagram of the tank bypass operation state in the jet pump mode.
FIG. 6 is a piping diagram showing a backwash state when the suction pipe in the air vent tank is eliminated in the jet pump mode, and FIG. 7 is a backwash state when the suction port in the bulkhead is eliminated in the jet pump mode. It is a piping diagram shown.
Hereinafter, the jet pump mode will be described with reference to FIG. 5 described above.

FIG. 3 shows a bypass operation state in which a water pump 18 for supplying water from the separation facility 16 to the rear water supply line 17 is stabilized. In this state, the rear water supply line 17, the bypass line 26, and the rear discharge line 15 are in communication with each other, and the water supplied from the water supply pump 18 is separated through these lines 17, 26, and 15. Equipment 1
Come back to 6. In this state, the remote control valve 30
, 32 and 28 are closed and the remote control valve 33 is opened. By circulating the water in this state, the water pump 18 is stabilized. This makes it possible to stabilize the flow velocity in the pipe so that the drilling debris has a flow rate that does not sink into the pipe when the drilling debris is carried.

FIG. 4 shows a tank bypass operation state. In the tank bypass operation state shown in FIG.
28 is opened and the remote control valve 33 is closed. As a result, the flow is switched to the rear water supply line 20 communicating with the air release tank 11, and the air release tank 11
The water supplied to the suction pipe 14 is discharged by the discharge pump 13.
Is returned to the separation equipment 16 via the rear discharge line 15. Therefore, even if there is earth and sand in the air release tank 11, it is discharged before excavation, and at the same time, the discharge pump 13 can be stabilized.

FIG. 5 shows an excavation state. After the water supply pump 18 and the discharge pump 13 are stabilized in the state shown in FIG. 4, the remote control valves 27, 29, 30 are opened to branch off from the rear water supply line 17. The pipeline is switched to the front water supply pipeline 19, and high-pressure water is supplied to the cutter head side by the jet generation pump 21. This high-pressure water is ejected from the nozzle 5 of the jet pump P, and the drilling debris is sucked from the suction port B by the negative pressure generated by the water flow, and is discharged to the front discharge pipe 4. Then, the lump is supplied to the crusher 12 to be crushed and temporarily stored in the air release tank 11.

The water in the air release tank 11 is supplied to the cutter cooling nozzle 8 and the suction nozzle 9 from the front water supply line 23 by a water supply pump 22. Further, the stored drilling waste is carried out by the discharge pump 13 to the separation facility 16 via the rear carrying-out conduit 15. When the water level in the air vent tank 11 drops, a signal from a water level gauge provided in the tank 11 causes the water feed pump 18 to move from the rear water feed line 17 through the rear water feed line 20 to the air vent tank. Supply water to 11. This state is an excavation state in the jet pump mode, and stable excavation work can be performed.

FIG. 6 shows a backwashing state when the suction pipe in the air release tank is closed, and shows a flow of water when a drill pipe is clogged in the suction pipe 14 provided on the outlet side of the air release tank 11. I have. In the case where the debris carried out of the air release tank 11 is clogged in the suction pipe 14 while excavating in the jet pump mode, the jet generation pump 21 is temporarily stopped, the discharge pump 13 is stopped, and the bypass pipe 26 is stopped.
By opening the remote control valve 33 of the rear water supply line 20 and closing the remote control valve 32 of the rear water supply line 17 and the remote control valve 30 of the rear water supply line 17, suction is performed from the rear water supply line 20 through the bypass line 26. Water is supplied to the pipe 14, and the clogged excavation waste is discharged into the air release tank 11. This is the so-called backwash. This clog elimination operation can be automatically performed by a switch operation of a control device (not shown), and when the clog is eliminated, the state is returned to a normal excavation state.

FIG. 7 shows a backwash state when the suction port blockage in the bulkhead is eliminated, and the suction port B in the bulkhead chamber is removed.
Shows the flow of water when a blockage occurs due to excavation waste. When excavation waste is clogged in the suction port B during the excavation in the jet pump mode, by closing the remote control valve 27 of the front discharge pipe 4, the water injected from the jet pump P is discharged from the suction port B in bulk. The excavation waste clogged by being injected into the head chamber 3 is discharged into the chamber 3. This clogging elimination work can also be automatically performed by a switch operation of a control device (not shown). When the clogging is eliminated, the state is returned to the normal excavation state.

FIG. 8 is a piping diagram showing a bypass operation state in the muddy water pressurizing mode, FIG. 9 is a piping diagram showing an excavating state in the muddy water pressurizing mode, and FIG. FIG. Hereinafter, the muddy water pressurization mode will be described.

When switching from the jet pump mode to the muddy water pressurizing mode, the suction nozzle 6 shown in FIG.
The nozzle is replaced by the suction nozzle 7 shown in FIG. 2 (b). The pipe switching section 34 provided in the front discharge pipe 4 is communicated with the muddy discharge pipe 35, and the pipe switching section 46 provided between the front water supply pipe 19 and the jet generation pump 21 is connected. It communicates with the rear water supply line 17 and the rear discharge line 15
And a pipe switching section 49 between the discharge pipe 40 and the discharge pipe 40. In addition, the pipe switching unit 45 provided in the muddy water supply pipe 39 is communicated linearly, and the front water supply pipe 23
And a pipe switching unit 47 provided in the front water supply pipe 19 are connected to the circulation pipe 54 and the pressurized pipe 5.
3. The pipe switching unit 43 provided in the bypass pipe 26 is switched so as to communicate with the muddy water bypass pipe 42.

FIG. 8 is a piping diagram in a bypass operation state.
After switching the pipe switching section as described above, the remote control valves 30, 32, 27 are closed and the remote control valves 33, 5 are closed.
By opening 0, the rear water supply line 17 is communicated with the muddy water discharge line 35 from the bypass line 26 via the muddy water bypass line 42, and from the rear discharge line 15 via the crusher 36 and the distributor 37. Water is returned to the separation facility 16. By circulating in this manner, the water supply pump 18 and the discharge pump 41 are stabilized.

FIG. 9 is a piping diagram in an excavated state. When the remote control valves 27, 29, and 30 are opened and the remote control valve 33 is closed, water is supplied from the water supply pump 18 to the pressurizing pipe 53. , Bulkhead chamber 3
Supplied inside.

On the other hand, excavation debris carried out from the suction port B provided in the lower part of the bulkhead chamber 3 is transferred from the front discharge pipe 4 to the crusher 36 via the muddy water discharge pipe 35.
It is thrown into. After being crushed by this crusher 36,
Part of the water is supplied from the muddy water supply line 39 to the circulation line 54 via the front water supply line 23 by the distributor 37, and is supplied into the bulkhead chamber 3.

The water supplied from the pressurizing line 53 and the circulation line 54 pressurizes the inside of the bulkhead chamber 3 to a predetermined pressure. The pressure in the chamber 3 is controlled by the pressure of water supplied by the water supply pump 18 from the separation facility 16 and the pressure of water supplied by the water supply pump 38 from the distributor 37. Excavation waste discharged from the distributor 37 is carried out from the discharge pipe 40 to the separation facility 16 via the rear discharge pipe 15.

FIG. 10 is a piping diagram of the reverse injection when the blockage is cleared. When the front discharge pipe 4 is clogged in the muddy water pressurization mode, the water supply pump 38 is stopped to supply water from the front water supply pipe 23. Is stopped, and the remote control valves 33, 52 are opened and the remote control valves 30, 50, 31 are closed, so that the rear water supply line 17 and the front discharge line 4 are connected via the muddy water bypass line 42. Communicate. Thereby, water can be supplied from the water supply pump 18 to the bulkhead chamber 3 from the suction port B via the muddy water bypass pipe 42 and the front discharge pipe 4. As a result, excavation debris or the like clogged in the front discharge pipe 4 is ejected into the bulkhead chamber 3 so that the blockage can be eliminated. According to this operation, even when the excavation debris is clogged in the suction port B, the blockage can be eliminated.

Excess mud in the chamber in this state is discharged from the pressurized pipe 53 through the front water supply pipe 19 and the bypass pipe 44 to the muddy discharge pipe 35, passes through the crusher 36, and passes through the crusher 36. Is carried out to the separation facility 16. This blockage elimination operation can be automatically performed by a switch operation of a control device (not shown), and when the clog is eliminated, the state is returned to a normal excavation state.

According to the piping system configured as described above, when excavating hard rock geology in the jet pump mode as shown in FIG. 5, when soft geology or a crush zone appears, Is switched to the muddy water pressurization mode in which the muddy water pressure is applied to the inside of the bulkhead chamber 3 as shown in FIG. As described above, this switching is performed so as to switch each pipe switching unit and operate the remote control valve to change the flow to the muddy water pressurization mode. When the drilling waste is clogged in the pipe in the jet pump mode or the muddy water pressurization mode, the clogged portion can be backwashed by switching the pipeline as described above, and the blockage can be eliminated.

Accordingly, high-speed construction in which the cutter disk is rotated at a high speed by propelling in the jet pump mode can be performed in the bedrock portion. It is possible to carry out the construction while keeping the mountain stable, and moreover, it is possible to carry out the construction while suppressing the spring water from the face by raising the muddy water pressure in the bulkhead chamber.

In the above-described embodiment, a circuit for resolving a pipeline blockage is also provided. However, a preferred embodiment is shown, and the present invention is not limited to this embodiment.

Further, the above-described embodiment is one embodiment, and various changes can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

[0050]

The present invention is embodied in the form described above, and has the following effects.

In rock masses, high-speed construction is possible by taking the excavation reaction from the ground, and in soft geology or crushed zones, mud pressure can be set up in the bulkhead chamber to excavate while keeping the ground stable. Therefore, even when the stratum to be excavated changes, efficient excavation work can be performed by an excavation method according to the geology.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a front portion of a tunnel excavator showing one embodiment of the present invention.

FIGS. 2A and 2B are views showing a suction nozzle of the tunnel excavator shown in FIG. 1, wherein FIG. 2A is a cross-sectional view showing a suction port in a jet pump mode, and FIG. It is.

FIG. 3 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram in a bypass operation state in a jet pump mode.

FIG. 4 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram in a tank bypass operation state in a jet pump mode.

FIG. 5 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram in an excavation state in a jet pump mode.

FIG. 6 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram showing a backwashing state at the time of eliminating a blockage of a suction pipe in an air release tank in a jet pump mode.

FIG. 7 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram showing a backwashing state at the time of eliminating a blockage of a suction port in a bulkhead in a jet pump mode.

FIG. 8 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram in a bypass operation state in a muddy water pressurization mode.

FIG. 9 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram in an excavation state in a muddy water pressurization mode.

10 is a diagram showing piping equipment of the tunnel excavator shown in FIG. 1, and is a piping diagram of reverse injection at the time of blockage removal in a muddy water pressurization mode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavator main body 2 ... Cutter head 2a ... Roller cutter 3 ... Bulk head chamber 4 ... Front discharge pipe 5 ... Jet pump nozzle 6, 7 ... Suction nozzle 6a, 7a ... Flange 6b, 7b ... Pipe 6c, 7c ... Opening 8 ... Cutter cooling nozzle 9 ... Suction port nozzle 10 ... Pressure pipe 11 ... Air vent tank 12 ... Crusher 13 ... Discharge pump 14 ... Suction pipe 15 ... Rear discharge pipe 16 ... Separation equipment 17 ... Rear water pipe Channel 18 ... Water supply pump 19 ... Front water supply line 20 ... Rear water supply line 21 ... Jet generating pump 22 ... Water supply pump 23 ... Front water supply line 24 ... Check valve 25 ... Manual open / close valve 26 ... Bypass line 27 , 28,29,30,31,32,33 Remote control valve 34 Pipe switching unit 35 Muddy water discharge line 36 Crusher 37 Distributor 38 ... water supply pump 39 muddy water supply line 40 ... carry-out line 41 ... discharge pump 42 ... muddy water bypass line 43 ... pipe switching unit 44 ... bypass line 45, 46, 47, 48, 49 ... pipe switching unit 50, 51 , 52: Remote control valve 53: Pressurizing line 54: Circulating line B: Suction port P: Jet pump

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-182182 (JP, A) JP-A-9-25786 (JP, A) JP-A-9-53391 (JP, A) 303080 (JP, A) JP 2-32437 (JP, B2) JP 7-6238 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/12

Claims (4)

(57) [Claims] 1. A suction port having a jet pump for carrying out drilling waste is provided in a bulkhead chamber, and the suction port is configured to be switchable between a jet pump mode and a muddy water pressurization mode. On a carriage, in a jet pump mode , a discharge pipe for discharging drilling debris in the bulkhead chamber from the suction port, and an air release tank for temporarily storing the discharged drilling debris,
A discharge pump for discharging drilling debris from the air release tank, and a water supply conduit for supplying water to the jet pump; and a discharge pipe for discharging drilling debris in a bulkhead chamber from the suction port in a muddy water pressurization mode. a road, and a dispenser for dispensing water from drilling muck that issued該搬, a discharge pump for unloading the excavation muck from the dispenser, and a water supply conduit for applying a mud pressure in the bulkhead chamber provided, out該搬 Excavation of pipeline switching means for switching between pipeline and water supply pipeline
Machine body or provided on the rear carriage and configured to be capable of switching between a water supply conduit and the discharge conduit to the jet pump mode and mud pressure mode, passing from the air vent tank to bulkhead chamber
A pipe line, and connect the pipe line in the jet pump mode.
Jet pump muddy pressurized type tunnel excavator that can be used for cutter cooling water line . 2. A bypass line is provided between the discharge line and the water supply line in the jet pump mode, and a bypass line is provided between the discharge line and the water supply line in the muddy water pressurization mode. The jet pump muddy pressurized tunnel excavator according to claim 1, wherein a circulation flow before excavation can be formed in these bypass pipes. 3. The muddy water circulation line in the muddy water pressurization mode, wherein a line leading from the distributor to the bulkhead chamber is provided. 2. The jet pump muddy pressurized tunnel excavator according to 2. 4. In each of a jet pump mode and a muddy water pressurization mode, when a drilling waste is clogged in a drain pipe, a blockage elimination line can be configured by switching between a water supply line and a discharge line to eliminate the blockage. The jet-pump muddy pressurized tunnel excavator according to any one of claims 1 to 3, wherein the tunnel excavator is configured as described above.