Mud-water separation system of three-stage sedimentation tank for construction sewage of TBM (Tunnel Boring Machine)

Abstract

The utility model discloses a mud-water separation system of a three-stage sedimentation tank for construction sewage of a TBM (Tunnel Boring Machine). The mud-water separation system comprises a sedimentation tank, a middle water tank, a clean water tank, a mud conveying pump, a mud conveying hose, a plurality of inter-pump butterfly valves, a plate-and-frame filter press, an electric control cabinet and the like. In the construction process, sewage continuously flows in from a sewage port of a sedimentation tank, each butterfly valve is opened, an electric control cabinet controls a slurry conveying pump to convey slurry into a slurry pressurizing pump when the slurry rises to a set height, and a control system controls the slurry pressurizing pump to input the slurry into a plate-and-frame filter press according to a pressure set value of a diaphragm type electric contact pressure gauge; under the action of pressure, water in the slurry is collected into a clear water tank through filter cloth of each filter chamber and flows into a clear water tank through a clear water recovery steel pipe, the dehydrated silt is pressed into mud cakes, and the mud cakes fall onto a waste conveying belt of a TBM (Tunnel Boring Machine) under the action of gravity and are conveyed to a waste field outside a tunnel, and the clear water in the clear water tank can be recycled; residual clear water can be continuously discharged out of the hole by a clear water pump.

Description

Technical Field

[0001] The utility model invention relates to a mud-water separation system, specifically to a mud-water separation system for a tertiary sedimentation tank for construction wastewater generated during TBM excavation. Technical Background

[0002] A large amount of sewage with high sediment content will be generated during the construction of TBM ultra-long tunnels. After the sewage is tertiary precipitated, the current common process is to pump the upper clear liquid in the sewage pool out of the tunnel or recycle it, and pump the precipitated mud to the tank truck with a mud pump and dump it in the waste yard outside the tunnel. Because the road slope of the tunnel branch tunnel is mostly greater than 10%, it is common for mud to spill from the tank to the outside during the tank truck transportation, which not only pollutes the slope, but also causes slippery road surface and buries hidden dangers to driving safety. Another wrong practice is to use a submersible sewage pump with stirring to mix the precipitated sediment and water evenly, and then discharge it out of the tunnel through the sewage pipe. Since the sewage discharge action is intermittent and discontinuous, when the sewage discharge is stopped, the sewage remaining in the sewage pipe is left to stand, and a large amount of sediment is precipitated in the sewage pipe. Over time, the diameter of the drainage pipe becomes smaller, and even forms a blockage, which seriously reduces the sewage discharge flow and efficiency of the sewage pipe; at the same time, it will form a huge resistance to sewage discharge, which greatly increases the energy consumption of sewage discharge and the construction cost rises sharply. In view of the above drawbacks, a mud-water separation system for a tertiary sedimentation tank for sewage constructed by a TBM tunneling machine can solve the above problems well, and the whole process is energy-saving and environmentally friendly. Utility Model Content

[0003] A mud-water separation system for a three-stage sedimentation tank for sewage constructed by a TBM excavator includes mud transportation, mud pressurization, mud-water separation, and mud cake transportation. Mud transportation is completed by a movable mud delivery pump with stirring through a mud delivery hose lined with steel wire and a pump-interval butterfly valve that acts as an isolation. This action is responsible for sending the evenly stirred mud to the mud pressure pump on the ground; the mud pressurization action is completed by a mud pressure pump, a diaphragm-type electric pressure gauge, and a mud delivery steel pipe with a butterfly valve in front of the machine, which is responsible for converting low-pressure mud into medium-pressure mud and sending it to a plate-frame filter press through a butterfly valve in front of the machine; the mud-water separation action is completed by a plate-frame filter press, a clean water butterfly valve, and a clean water recovery steel pipe, and its purpose is to separate the silt and water in the mud and send the separated clean water to the clean water tank; the mud cake transportation action is that the waste conveyor belt of the TBM excavator sends the mud cake to the waste yard outside the cave.

[0004] The process of a mud-water separation system for mud in a three-stage sedimentation tank for construction sewage of a TBM tunneling machine is as follows: during the construction of the TBM tunneling machine, construction sewage continuously flows into the sedimentation tank from the sewage inlet, all pump room butterfly valves, machine front butterfly valves and clean water butterfly valves in the system are opened, a movable mud delivery pump with a stirring device is controlled by a control cabinet to deliver the evenly stirred mud to a mud pressure pump, the mud pressure pump pressurizes the mud to a pressure of 8KG set by a diaphragm electric contact pressure gauge, and delivers the mud to each filter chamber of a plate and frame filter press through a mud delivery steel pipe, the clean water passes through the filter cloth and is collected in the clean water tank of the plate and frame filter press, and flows into the clean water tank through the clean water butterfly valve and the clean water recovery steel pipe, the clean water in the clean water tank can be recycled, and the rest can be discharged outside the tunnel. The mud booster pump continuously presses the mud into each filter chamber of the plate-and-frame filter press. The filtered sediment accumulates more and more in the filter chamber. The dehydrated mud forms a mud cake, which increases in thickness and gradually decreases in moisture content. When there is no clear water seeping out of the outlet side of the filter cloth, the mud cake is finally formed. The system first stops the mud booster pump, then stops the mud delivery pump, and the plate-and-frame filter press unloads the mud cake piece by piece from front to back according to the set program. The mud cake falls onto the waste conveyor belt of the TBM tunneling machine due to gravity, and is then sent to the waste yard outside the tunnel.

[0005] The technical feature of the utility model is that an electrical control cabinet controls a movable mud delivery pump with a stirring device to deliver the evenly stirred mud to a mud pressure pump. The two cooperate to avoid the occurrence of accidents such as the mud pressure pump being unable to suck up mud due to gaps caused by high-speed rotation wear of the packing seal of the mud pressure pump, which causes the seal to be damaged, and the bearing losing cooling to generate high temperature and burn out.

[0006] The technical feature of the utility model is that a diaphragm electric contact pressure gauge is used in the system, so that the pressure of the mud sent to the plate and frame filter press is effectively controlled and kept relatively constant.

[0007] The technical feature of the utility model is that a plate-frame filter press is used in the system to press the mud into a mud cake with a water content of about 30% and send the mud cake to a waste yard outside the tunnel along a waste conveyor belt of the TBM tunneling machine.

[0008] The technical feature of the utility model is that the plate-and-frame filter press is mounted on the TBM waste conveyor belt, so that the squeezed mud cake can be conveniently transported to the waste yard without adding additional transportation equipment, thus saving engineering expenses.

[0009] The technical features of the utility model also include sewage inlet, first overflow port, second overflow port, movable mud delivery pump with stirring device, which is arranged in the sedimentation tank, the intermediate water tank, the clean water tank and one side thereof, and is connected to the first pump room butterfly valve which plays an isolating role through the mud delivery hose lined with steel wire, and the first pump room butterfly valve is connected to the inlet flange of the mud booster pump through the mud delivery pipe, and the mud delivery pipe connects the mud booster pump to the front butterfly valve of the machine through two flanges, and a diaphragm electric contact pressure gauge is welded on the mud delivery pipe, and the mud delivery pipe connects the front butterfly valve of the machine through two flanges. The butterfly valve is connected to the plate and frame filter press. The clean water separated by the plate and frame filter press flows into the clean water tank through the clean water butterfly valve that acts as a partition and the clean water recovery steel pipe. The mud cake formed by the plate and frame filter press falls onto the waste conveyor belt of the TBM tunneling machine by gravity when the plate is cleaned, and is then sent to the waste yard outside the tunnel. After the mud in the sedimentation tank is cleaned, the intermediate water tank and the clean water tank that reach the mud depth can be cleaned. The mud delivery pump is connected to the second pump room butterfly valve and the third pump room butterfly valve respectively to complete the same action. The electrical system of the entire mud and water separation system is controlled by the electrical control cabinet.

[0010] The technical feature of the utility model is that a mud conveying interface is reserved for a movable mud conveying pump with a stirring device in the sedimentation tank, the intermediate water tank and the clear water tank. When the mud in each tank reaches a set height, the mud conveying pump conveys the evenly stirred mud to the mud pressure pump through a mud conveying hose lined with steel wire.

[0011] The technical feature of the utility model is that a diaphragm electric contact pressure gauge is designed in the system, so that the electrical control cabinet can control the mud pressure pump to provide mud to the plate and frame filter press according to the set value of the diaphragm electric contact pressure gauge.

[0012] The technical feature of the utility model is that the plate-and-frame filter press is installed above the waste conveyor belt of the TBM boring machine, so that the mud cake can be sent to the waste yard by utilizing ready-made resources.

[0013] The technical feature of the utility model is that the clean water obtained by filtering by the plate-frame filter press flows into the clean water tank through the clean water recovery steel pipe and the clean water butterfly valve.

[0014] The technical feature of the utility model is that a plate-frame filter press is designed in the separation system to separate the water from the mud.

[0015] The beneficial effects of the utility model are as follows: a mud-water separation system for a three-stage sedimentation tank for sewage during TBM construction effectively avoids the situation in which mud is spilled from a tank truck to pollute the environment, eliminates the hidden danger to driving safety caused by slippery road surface due to the above reasons, and eliminates the disadvantage of blockage of sewage pipes caused by directly using a submersible sewage pump to discharge mud outside the tunnel.

[0016] The beneficial effects of the utility model also lie in: a mud-water separation system for a three-stage sedimentation tank for sewage from a TBM tunneling machine construction, which places a plate-and-frame frame on a waste conveyor belt of the TBM tunneling machine, and uses on-site construction transportation resources to deliver mud cakes to a waste yard, thus fully tapping the potential of on-site production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the structure of a mud-water separation system for a three-stage sedimentation tank for sewage construction by a TBM tunneling machine.

[0018] Among them: 1. Sedimentation tank 2. Intermediate water tank 3. Clear water tank 4. Mud pressure pump

[0019] 5. Butterfly valve in the first pump room 6. Mud delivery pump 7. Diaphragm electric contact pressure gauge 8. Plate and frame filter press

[0020] 9. TBM waste conveyor belt 10. Sewage inlet 11. Clean water recovery steel pipe 12. Mud delivery pipe 13. Mud delivery hose lined with steel wire 14. Electrical control cabinet 15. Front butterfly valve 16. Clean water butterfly valve

[0021] 17. First overflow port 18. Second overflow port 19. Second pump room butterfly valve 20. Third pump room butterfly valve DETAILED DESCRIPTION

[0022] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0023] A mud-water separation system for a three-stage sedimentation tank for sewage during construction of a TBM. During the construction of the TBM, sewage with a continuous high sediment content flows into the sewage inlet (10) of the sedimentation tank (1). When the depth of the mud reaches one third of the tank depth, the first pump room butterfly valve (5), the machine front butterfly valve (15), and the clean water butterfly valve (16) are opened, and the electrical control cabinet (14) issues a start command to a movable mud delivery pump (6) with a stirring device. The mud delivery pump (6) delivers the evenly stirred mud to the mud delivery tank through a mud delivery hose (13) lined with steel wire, the first pump room butterfly valve (5), and the mud delivery pipe (12) through a reserved mud delivery interface. The booster pump (4) is operated. At the same time, the electrical control cabinet (14) instructs the mud booster pump (4) to increase the pressure according to the pressure setting value of the diaphragm electric contact pressure gauge (7). The mud with constant pressure is sent to each filter chamber in the plate and frame filter press (8) through the mud delivery pipe (12) and the front butterfly valve (15). Under the joint action of the hydraulic system of the plate and frame filter press (8) and the mud booster pump (4), the water in the mud passes through the filter cloth and is collected in the clean water tank. It flows into the clean water tank (3) through the clean water butterfly valve (16) and the clean water recovery steel pipe (11). A part of the clean water collected in the clean water tank (3) is recycled by the project, and the remaining clean water is discharged to the outside of the cave by the clean water pump in a relay manner.

[0024] The dehydrated mud is pressed into mud cakes, and according to the pre-set program of the plate and frame filter press (8), under the action of gravity, the mud cakes fall one by one onto the TBM excavator waste conveyor belt (9) below the plate and frame filter press (8) and are sent to the waste yard outside the tunnel.

[0025] Similarly, when the mud level in the intermediate water pool (2) and the clear water pool (3) rises to one third of the pool height, the mud delivery pump (6) will be connected to the corresponding second pump room butterfly valve (19) or third pump room butterfly valve (20) to complete the same mud-water separation action, and the generated mud cake will be sent to the waste yard outside the tunnel through the TBM excavator waste conveyor belt (9).

Claims

1. A mud-water separation system for a three-stage sedimentation tank for TBM construction wastewater, characterized by: The invention comprises a sewage inlet (10), a first overflow port (17), a second overflow port (18) arranged on a sedimentation tank (1), an intermediate water tank (2), a clean water tank (3) and one side thereof, and a movable mud delivery pump (6) with a stirring device, which is connected to a first pump room butterfly valve (5) having an isolation function through a mud delivery hose (13) lined with steel wires, the first pump room butterfly valve (5) is butt-jointed with an inlet flange of a mud booster pump (4) through a mud delivery pipe (12), the mud delivery pipe (12) connects the mud booster pump (4) with a front butterfly valve (15) through two flanges, a diaphragm electric contact pressure gauge (7) is welded on the mud delivery pipe (12), and the front butterfly valve (15) is connected to the mud booster pump (4) through two flanges. (15) is connected to the plate and frame filter press (8), and the clean water separated by the plate and frame filter press (8) flows into the clean water tank (3) through the clean water butterfly valve (16) and the clean water recovery steel pipe (11) which play a role of isolation. When the mud cake formed by the plate and frame filter press (8) is cleaned, it falls to the waste conveyor belt (9) of the TBM tunneling machine by gravity and is sent to the waste yard outside the tunnel. After the mud in the sedimentation tank (1) is cleaned, the intermediate water tank (2) and the clean water tank (3) that reach the mud depth can be cleaned. The mud delivery pump (6) is respectively connected to the second pump room butterfly valve (19) and the third pump room butterfly valve (20) to complete the same action. The electrical system of the whole mud and water separation system is controlled by the electrical control cabinet (14).

2. A mud-water separation system for a three-stage sedimentation tank for TBM construction wastewater according to claim 1, characterized in that The sedimentation tank (1), the intermediate water tank (2) and the clear water tank (3) are provided with interfaces for conveying mud for a movable mud conveying pump (6) with a stirring device. When the mud in each tank reaches a set height, the mud conveying pump (6) conveys the evenly stirred mud to the mud pressure pump (4) through a mud conveying hose (13) lined with steel wire.

3. A mud-water separation system for a tertiary sedimentation tank for TBM construction wastewater according to claim 1, characterized in that A diaphragm electric contact pressure gauge (7) is designed in the system so that the electrical control cabinet (14) can control the mud pressure pump (4) to supply mud to the plate-and-frame filter press (8) according to the set value of the diaphragm electric contact pressure gauge (7).

4. A mud-water separation system for a tertiary sedimentation tank for TBM construction wastewater according to claim 1, characterized in that The plate and frame filter press (8) is installed above the waste conveyor belt (9) of the TBM boring machine, so that the mud cake can be sent to the waste yard using ready-made resources.

5. A mud-water separation system for a tertiary sedimentation tank for TBM construction wastewater according to claim 1, characterized in that The clean water obtained by filtering the plate-and-frame filter press (8) flows into the clean water tank (3) through the clean water recovery steel pipe (11) and the clean water butterfly valve (16).

6. A mud-water separation system for a tertiary sedimentation tank for TBM construction wastewater according to claim 1, characterized in that The separation system is designed with a plate and frame filter press (8) to separate the water from the mud.

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