Slurry shield and method for preventing clogging thereof

Abstract

The application provides a slurry shield and a method for preventing blockage of the slurry shield, and the slurry shield comprises a cutter head, a slurry bin, a residue discharge box, a communication and interruption device and a slurry discharge pipe, the slurry bin is arranged at the back side of the cutter head, the communication and interruption device is installed on the residue discharge box and is used for communicating or interrupting the slurry bin and the residue discharge box, and the slurry discharge pipe is movably connected to the residue discharge box, and the slurry discharge pipe can be moved to communicate with the slurry bin, so that the technical problem that the slurry shield has great difficulty in processing when encountering residue accumulation at the bottom of the slurry bin, the construction efficiency is affected, and great safety risks exist is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield construction, and in particular to a slurry shield and a method for preventing blockage thereof. BACKGROUND

[0002] The slurry shield is an important equipment for engineering construction and construction of urban rail transit. The slurry shield with a direct discharge mode can directly discharge the slurry through the bottom of the soil chamber, thereby avoiding the problems of blockage and slow discharge in the process of discharging the slurry through the bottom of the slurry chamber of the air cushion slurry shield.

[0003] The slurry shield with the direct discharge mode is generally used in soft soil, mudstone and small-grained slurry strata. However, there are certain blind areas in geological exploration, such as individual boulders and driftwood in soft soil strata. The large-grained slurry stones enter the slurry chamber along with the rotation of the cutter head. The diameter of the slurry discharge pipeline of the slurry shield with the direct discharge mode is small, which causes the accumulation of these slurry stones at the bottom of the slurry chamber, resulting in blockage of the slurry chamber and damage to the components in the slurry chamber such as cutters, cutter monitoring sensors and stirring rods.

[0004] At present, when the problem of accumulation of slurry stones at the bottom of the slurry chamber occurs, professional operators need to enter the chamber under pressure to fish out or break the slurry stones. The entire process requires entering the chamber under pressure, which takes a long time and affects the construction efficiency. Meanwhile, there is a safety risk of personnel entering the chamber. SUMMARY

[0005] The present application aims to provide a slurry shield and a method for preventing blockage thereof, so as to solve the technical problems of great difficulty in treatment, low construction efficiency and great safety risk when the slurry shield encounters the problem of accumulation of slurry stones at the bottom of the slurry chamber.

[0006] The above-mentioned object of the present application can be achieved by using the following technical solutions:

[0007] The present application provides a slurry shield, comprising a cutter head, a slurry chamber, a slurry discharge box, an on-off device and a slurry discharge pipe. The slurry chamber is arranged at the rear side of the cutter head. The on-off device is installed on the slurry discharge box and is used to communicate or isolate the slurry chamber and the slurry discharge box. The slurry discharge pipe is movably connected to the slurry discharge box and can be moved to communicate with the slurry chamber.

[0008] In a preferred embodiment, the on-off device comprises a partition plate and a gate. The partition plate is arranged between the slurry chamber and the slurry discharge box. The partition plate is provided with a communication port. The gate is arranged on the partition plate and is used to control the on-off of the communication port.

[0009] In a preferred embodiment, the slurry discharge box is arranged at the rear side of the slurry chamber. The partition plate is installed on the front end face of the slurry discharge box.

[0010] In a preferred embodiment, the slurry discharge pipe is at least partially located in the residue discharge box, and an end of the slurry discharge pipe is movable to the communication opening.

[0011] In a preferred embodiment, the slurry shield includes an extension mechanism connected to the slurry discharge pipe to move the slurry discharge pipe.

[0012] In a preferred embodiment, the extension mechanism is located in the residue discharge box, and the extension mechanism is capable of moving the slurry discharge pipe in the front-rear direction.

[0013] In a preferred embodiment, the residue discharge box is provided with a stone window.

[0014] The present application provides a method for preventing clogging of a slurry shield, which uses the slurry shield described above, and the method includes:

[0015] The slurry discharge pipe is retracted;

[0016] Large-diameter residue stones in the slurry chamber enter the residue discharge box through the on-off device;

[0017] The on-off device is closed;

[0018] The large-diameter residue stones entering the residue discharge box are removed;

[0019] The slurry discharge pipe is returned to communication with the slurry chamber.

[0020] In a preferred embodiment, during the process of removing the large-diameter residue stones entering the residue discharge box, the residue discharge box is isolated from the slurry chamber.

[0021] In a preferred embodiment, the process of removing the large-diameter residue stones entering the residue discharge box includes:

[0022] The slurry in the residue discharge box is extracted through the slurry discharge pipe;

[0023] The stone window on the residue discharge box is opened, and the large-diameter residue stones in the residue discharge box are removed.

[0024] The present application has the following characteristics and advantages:

[0025] The slurry shield is provided with a cutter head, a slurry tank, a slurry discharge pipe and a slurry discharge box, wherein the slurry tank is arranged below the cutter head, the slurry discharge pipe is arranged on the slurry tank, and the slurry discharge box is arranged below the slurry discharge pipe; when the slurry shield is in normal tunneling, the cuttings after being cut by the cutter head fall into the slurry tank, and the slurry is discharged from the slurry tank through the slurry discharge pipe; when large-diameter cuttings fall into the slurry tank and cannot be discharged, the slurry discharge pipe is moved to be separated from the slurry tank, the large-diameter cuttings enter the slurry tank through the on-off device, the on-off device is closed, and the large-diameter cuttings can be broken in the slurry discharge box; after the treatment is completed, the slurry discharge pipe is returned to be in communication with the slurry tank, and the normal tunneling is restored. When the slurry shield encounters large-diameter cuttings blockage, the operator does not need to enter the tank for treatment under pressure, and the operator does not need to operate under pressure, so that the safety of taking out the cuttings is ensured, the large-diameter cuttings are treated under non-pressure, the risk of personnel operation is reduced, and the construction steps of reinforcing the stratum and lowering the liquid level of the slurry tank when entering the tank are avoided, so that the tunneling efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0027] Figure 1 A schematic diagram of the slurry shield in a normal tunneling state provided by the present application is shown in the figure.

[0028] Figure 2 A partial enlarged view of A in the figure. Figure 1

[0029] Figure 3 A schematic diagram of B in the figure. Figure 2

[0030] Figure 4 A schematic diagram of the slurry shield in a cuttings discharge state provided by the present application is shown in the figure.

[0031] Figure 5 A partial enlarged view of C in the figure. Figure 4

[0032] Figure 6 A schematic diagram of D-D in the figure. Figure 5

[0033] Figure 7 A schematic diagram of the anti-blocking method of the slurry shield provided by the present application is shown in the figure.

[0034] Explanation of reference numerals:

[0035] 10, cutter head;

[0036] 20, slurry tank;

[0037] 30, cuttings discharge box; 31, stone fishing window; ​​​​

[0038] 40. Switching device; 41. Partition plate; 411. Connecting port; 42. Gate;

[0039] 51. Slurry discharge pipe; 52. Expansion joint; 53. Sealing element. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Option 1

[0042] This invention provides a slurry shield tunneling machine, such as... Figures 1-6 As shown, the slurry shield tunneling machine includes: a cutterhead 10, a slurry chamber 20, a slag discharge box 30, a switching device 40, and a slurry discharge pipe 51. The slurry chamber 20 is located on the rear side of the cutterhead 10. The switching device 40 is installed on the slag discharge box 30 and is used to connect or disconnect the slurry chamber 20 from the slag discharge box 30. The slurry discharge pipe 51 is movably connected to the slag discharge box 30 and can be moved to connect with the slurry chamber 20.

[0043] During normal tunneling, the excavated soil from the cutterhead 10 falls into the slurry chamber 20, and the slurry is discharged from the slurry chamber 20 through the slurry discharge pipe 51. When large-diameter stones fall into the slurry chamber 20 and cannot be discharged, the slurry discharge pipe 51 moves to detach from the slurry chamber 20. The large-diameter stones then enter the slurry chamber 20 through the switching device 40. After the switching device 40 is closed, the large-diameter stones can be broken up in the excavation box 30. After processing, the slurry discharge pipe 51 returns to its original position and connects to the slurry chamber 20, resuming normal tunneling. When encountering blockages caused by large-diameter stones, this slurry shield tunneling eliminates the need for pressurized entry into the chamber, ensuring safe removal of the stones. This allows for the processing of large-diameter stones without pressure, reducing the risk to personnel and avoiding the need for ground reinforcement and lowering the slurry level in the slurry chamber 20 during entry, thus improving tunneling efficiency.

[0044] In one embodiment, the switching device 40 includes a partition 41 and a gate 42. The partition 41 is disposed between the mud and water tank 20 and the slag discharge box 30. The partition 41 is provided with a connecting port 411. The gate 42 is disposed on the partition 41 and is used to control the opening and closing of the connecting port 411. The mud in the mud and water tank 20 can flow into the slag discharge box 30 through the connecting port 411.

[0045] like Figure 1As shown, the residue discharge box 30 is arranged at the rear side of the slurry tank 20, and the partition plate 41 is installed at the front end face of the residue discharge box 30. Specifically, the communication port 411 is matched with the residue discharge box 30, and the slurry in the slurry tank 20 can flow directly into the residue discharge box 30 through the communication port 411 on the partition plate 41. The residue discharge box 30 is located at the bottom of the shield body, and the partition plate 41 is directly connected with the front part of the residue discharge box 30. The opening and closing of the gate 42 realizes the on-off of the communication port 411, so as to isolate the residue discharge box 30 from the slurry tank 20.

[0046] The structure of the gate 42 is not limited to one type. For example, the power source for the opening and closing action of the gate 42 can be an oil cylinder drive, a screw drive, or a motor drive.

[0047] Further, the residue discharge pipe 51 is at least partially located in the residue discharge box 30, and the end of the residue discharge pipe 51 can be moved to the communication port 411. During normal tunneling, the front end of the residue discharge pipe 51 is moved to the communication port 411, and the residue and slurry in the slurry tank 20 are discharged from the slurry tank 20 through the residue discharge pipe 51.

[0048] In an embodiment, the slurry shield includes an extension mechanism 52 connected with the residue discharge pipe 51 to drive the residue discharge pipe 51 to move. Specifically, the residue discharge pipe 51 is connected to the extension mechanism, and the residue discharge pipe 51 is moved to the communication port 411 of the partition plate 41 or away from the partition plate 41 by the extension mechanism 52.

[0049] Further, as shown, Figures 2-3 The extension mechanism 52 is located in the residue discharge box 30, and the extension mechanism 52 can drive the residue discharge pipe 51 to move in the front-rear direction, so that the residue discharge pipe 51 is extended to the partition plate 41 or retracted to the rear part of the residue discharge box 30.

[0050] The residue discharge pipe 51 can be arranged inside the extension mechanism 52, and the residue discharge box 30 becomes an independent box structure through the extension of the residue discharge pipe 51. A sealing member 53 is arranged between the extension mechanism 52 and the residue discharge box 30, and the sealing member 53 can ensure that the slurry flowing into the residue discharge box 30 is not leaked during the extension and retraction of the residue discharge pipe 51.

[0051] The structure of the extension mechanism 52 is not limited to one type. For example, the power source for the extension and retraction action of the extension mechanism 52 can be an oil cylinder drive, a screw drive, or a motor drive.

[0052] As shown, Figure 5 and Figure 6 The residue discharge box 30 is provided with a stone fishing window 31, and personnel can enter the inside of the residue discharge box 30 through the opening and closing of the stone fishing window 31 to process the residue.

[0053] The residue discharging box 30 can be mounted on the shield shell of the slurry shield tunneling machine, and the shield shell supports the residue discharging box 30 and the like. The slurry shield tunneling machine can be a direct discharge type slurry shield tunneling machine, which can realize safe removal of residue without pressure operation when large-diameter residue blocks. The slurry shield tunneling machine is not limited to the direct discharge type slurry shield tunneling machine with the partition plate 41, but can also be a gas cushion direct discharge type slurry shield tunneling machine with a buffer bin.

[0054] Scheme II

[0055] The application provides a residue blocking prevention method for a slurry shield tunneling machine. Figure 7 As shown in the figure, the residue blocking prevention method comprises: retracting the slurry discharge pipe 51; large-diameter residue in the slurry bin 20 entering the residue discharging box 30 through the on-off device 40; closing the on-off device 40; removing the large-diameter residue entering the residue discharging box 30; and returning the slurry discharge pipe 51 to the slurry bin 20.

[0056] The residue blocking prevention method for the slurry shield tunneling machine can realize safe removal of residue without pressure operation when large-diameter residue blocks, and can realize removal of large-diameter residue without pressure, reduce the risk of personnel operation, and avoid the construction steps of reinforcing the stratum and lowering the liquid level of the slurry bin 20 when entering the bin, thereby improving the tunneling efficiency.

[0057] During normal tunneling, residue cut from the cutter head 10 falls into the slurry bin 20, and slurry is discharged from the slurry bin 20 through the slurry discharge pipe 51. During the removal process of the large-diameter residue entering the residue discharging box 30, the residue discharging box 30 is isolated from the slurry bin 20 to facilitate personnel entering the residue discharging bin for treatment. The removal process of the large-diameter residue entering the residue discharging box 30 comprises: extracting slurry in the residue discharging box 30 through the slurry discharge pipe 51; and opening the stone fishing window 31 on the residue discharging box 30 to break the large-diameter residue in the residue discharging box 30.

[0058] The implementation steps of the slurry shield tunneling machine comprise:

[0059] S1, during normal tunneling, the slurry discharge pipe 51 is extended to the position of the partition plate 41, at this time the gate 42 is in an open state, and the stone fishing window 31 is in a closed state, residue cut from the cutter head 10 falls into the bottom of the slurry bin 20, and slurry is discharged from the slurry bin 20 through the slurry discharge pipe 51;

[0060] S2, when large-diameter residue larger than the diameter of the slurry discharge pipe 51 falls into the slurry bin 20, the bottom of the slurry bin 20 is blocked; after detecting the problem of large-diameter residue blocking, the extension mechanism 52 drives the slurry discharge pipe 51 to retreat to the rear of the residue discharging box 30;

[0061] S3, the large size slag stone enters the slag discharge box 30, the gate 42 is closed, at this time the large size slag stone is isolated from the front slurry bin 20, the slag discharge box 30 and the front slurry bin 20 have been completely isolated;

[0062] S4, continue to extract the slurry in the slag discharge box 30 through the slurry discharge pipe 51, open the stone window 31, detect the slag stone condition inside the slag discharge box 30, and can carry out breaking and other treatment operations;

[0063] S5, after the slag stone inside the slag discharge box 30 is treated, the stone window 31 is closed, the slag discharge box 30 becomes a closed structure; the telescopic structure slowly extends the slurry discharge pipe 51, when reaching the gate 42 position, the gate 42 is opened, the slurry discharge pipe 51 is restored to the normal tunneling position through the telescopic structure, the slurry in the slurry bin 20 is normally discharged through the slurry discharge pipe 51.

[0064] The above only describes several embodiments of the present application, and those skilled in the art can make various modifications or changes to the embodiments of the present application according to the disclosed content of the application file without departing from the spirit and scope of the present application.

Claims

1. A slurry shield tunneling machine, characterized in that, include: The cutter head (10), mud and water tank (20), slag discharge box (30), on / off device (40) and slurry discharge pipe (51) are provided. The mud and water tank (20) is located on the rear side of the cutter head (10). The on / off device (40) is installed on the slag discharge box (30) and is used to connect or disconnect the mud and water tank (20) from the slag discharge box (30). The slurry discharge pipe (51) is movably connected to the slag discharge box (30) and can be moved to connect with the mud and water tank (20). The switching device (40) includes a partition (41) and a gate (42). The partition (41) is disposed between the mud and water tank (20) and the slag discharge box (30). The partition (41) has a connecting port (411). The gate (42) is disposed on the partition (41) and is used to control the opening and closing of the connecting port (411). The slurry discharge pipe (51) is at least partially located in the slag discharge box (30), and the end of the slurry discharge pipe (51) can move to the connecting port (411).

2. The slurry shield tunneling machine according to claim 1, characterized in that, The slag discharge box (30) is arranged on the rear side of the mud and water tank (20), and the partition (41) is installed on the front end face of the slag discharge box (30).

3. The slurry shield tunneling machine according to claim 1, characterized in that, The slurry shield tunnel includes a telescopic mechanism (52), which is connected to the slurry discharge pipe (51) to drive the slurry discharge pipe (51) to move.

4. The slurry shield tunneling machine according to claim 3, characterized in that, The telescopic mechanism (52) is located inside the slag discharge box (30), and the telescopic mechanism (52) can drive the slurry discharge pipe (51) to move in the front-back direction.

5. The slurry shield tunneling machine according to claim 1, characterized in that, The slag discharge box (30) is equipped with a stone scooping window (31).

6. A method for preventing blockage in slurry shield tunneling machines, characterized in that, The anti-clogging method using the slurry shield tunneling machine according to any one of claims 1-5 includes: The slurry discharge pipe (51) is retracted; Large-diameter slag in the mud and water tank (20) enters the slag discharge box (30) through the switching device (40); The switching device (40) is closed; Large-diameter slag stones entering the slag discharge box (30) are discharged; The slurry discharge pipe (51) is returned to its original position to connect with the mud and water tank (20).

7. The anti-clogging method for slurry shield tunneling according to claim 6, characterized in that, During the process of removing large-diameter slag from the slag discharge box (30), the slag discharge box (30) is isolated from the mud and water tank (20).

8. The anti-clogging method for slurry shield tunneling according to claim 7, characterized in that, The process of removing large-diameter slag stones entering the slag discharge box (30) includes: The slurry in the slag discharge box (30) is extracted through the slurry discharge pipe (51); Open the stone-retrieving window (31) on the slag discharge box (30) to break up the large-diameter slag inside the slag discharge box (30).

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