Sewage treatment system in shield construction of subway tunnel

Abstract

The invention discloses a sewage treatment system in shield construction of a subway tunnel, which relates to the technical field of sewage treatment and comprises an equipment bridge secondary sedimentation tank, a sixth trolley secondary sedimentation tank, a fifth trolley secondary sedimentation tank, a wellhead three-stage sedimentation tank and a ground three-stage sedimentation tank which are sequentially connected together through pipelines from front to back, sewage collected at the shield tail passes through the equipment bridge secondary sedimentation tank, the sixth trolley secondary sedimentation tank, the fifth trolley secondary sedimentation tank, the wellhead three-stage sedimentation tank and the ground three-stage sedimentation tank. According to the sewage treatment system in shield construction of the subway tunnel, graded sedimentation of silt is achieved through a five-stage sedimentation system, compared with a traditional single-stage sedimentation mode, the silt carrying amount is remarkably reduced, the risk that a blow-off pipeline is blocked is effectively avoided, in addition, through the combined mode of annular water film protection and self-rotating spray head breaking, secondary pollution in the desilting process is prevented, and the sewage treatment efficiency is improved. And the sludge crushing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically to a sewage treatment system in subway tunnel shield method construction. BACKGROUND

[0002] In the city subway tunnel construction, more and more earth pressure balance shield machines are used, and in the construction process of the earth pressure balance shield machine, due to the falling of the belt conveyor slag, the shield tail slurry leakage, and the slag transportation process of the electric car, a large amount of sewage is generated when the tunnel is washed. The conventional treatment scheme is: the sewage of the shield tail is pumped and discharged to the secondary sedimentation tank on the No. 5 trolley through the diaphragm pump, then the sewage after sedimentation is pumped and discharged to the wellhead designed three-stage sedimentation tank through the sewage pump, then the sewage after sedimentation in the three-stage sedimentation tank is pumped and discharged to the three-stage sedimentation tank on the ground, and finally it is discharged into the municipal pipe network.

[0003] In the above scheme, there are the following problems: 1. Due to the small capacity of the secondary sedimentation tank on the No. 5 trolley, the number of sedimentation stages is too small, and a large amount of mud will be carried when the sewage pump pumps the sewage, which will cause the blockage of the tunnel sewage pipe, at this time a large amount of manual labor is needed to dredge the pipe; 2. The three-stage sedimentation tanks at the wellhead and on the ground also need to be cleaned regularly, otherwise the sewage that does not meet the standards will be discharged into the municipal pipe network; 3. If the three-stage sedimentation tank on the ground is not cleaned in time, the sewage will enter the municipal pipe network, which will cause the blockage of the municipal pipe network and produce a large negative social effect.

[0004] Therefore, it is necessary to propose a sewage treatment system in subway tunnel shield method construction to solve the above problems. SUMMARY

[0005] The technical problem solved by the present application is to provide a sewage treatment system in subway tunnel shield method construction to solve the problem of small capacity and easy blockage of the existing sewage treatment system in the background art.

[0006] Technical solution: To achieve the above object, the sewage treatment system in subway tunnel shield construction is realized by the following technical solutions: a sewage treatment system in subway tunnel shield construction, which comprises, from front to back, a device bridge secondary sedimentation tank, a No. 6 trolley secondary sedimentation tank, a No. 5 trolley secondary sedimentation tank, a well head tertiary sedimentation tank, a ground tertiary sedimentation tank and a flushing device arranged in the device bridge secondary sedimentation tank, wherein the sewage collected at the shield tail is conveyed to the municipal pipe network after being filtered and deposited by the device bridge secondary sedimentation tank, the No. 6 trolley secondary sedimentation tank, the No. 5 trolley secondary sedimentation tank, the well head tertiary sedimentation tank and the ground tertiary sedimentation tank; a partition is fixedly installed in the device bridge secondary sedimentation tank, which divides the device bridge secondary sedimentation tank into a front deposition cavity and a rear deposition cavity, and both the front deposition cavity and the rear deposition cavity are funnel-shaped; the flushing device comprises a plurality of flushing mechanisms uniformly arranged at the bottom of the front deposition cavity, wherein each flushing mechanism comprises a shell fixedly connected with the device bridge secondary sedimentation tank and having two open ends, the water inlet of the shell is connected with the high-pressure flushing device of the shield machine, a fixed ring is fixedly installed in the shell, two limiting rings I are fixedly installed between the fixed ring and the water inlet of the shell; a connecting pipe is movably sleeved in the fixed ring, one end of the connecting pipe extends out of the shell and is fixedly installed with a self-rotating nozzle, the other end of the connecting pipe extends between the two limiting rings I and is fixedly sleeved with a limiting ring II; a conical groove is concentrically formed in the water outlet of the shell, a circular table is arranged in the conical groove, the circular table is fixedly sleeved on the connecting pipe, and the circular table does not contact the conical groove; a plurality of through holes are formed in the fixed ring, a spring is sleeved on the connecting pipe between the fixed ring and the limiting ring II, and an electromagnetic valve and a pressure sensor are fixedly installed in the connecting pipe, and the electromagnetic valve and the pressure sensor are controlled.

[0007] Preferably, the output end of the diaphragm pump of the shield tail of the shield machine is fixedly installed with a blowdown pipe, the other end of the blowdown pipe extends into the primary deposition cavity of the device bridge secondary sedimentation tank, and the output end of the blowdown pipe is provided with an anti-impact bottom device, and the anti-impact bottom device comprises a Y-shaped joint, and a semicircular baffle is fixedly installed in each output end of the Y-shaped joint.

[0008] Preferably, the flushing device further comprises a ring-shaped hose fixedly installed at the bottom of the front deposition cavity, and the plurality of shells are connected with the high-pressure flushing device of the shield machine through the ring-shaped hose.

[0009] Preferably, the upper part of each of the front deposition cavity and the rear deposition cavity is rectangular, and the lower part of each of the front deposition cavity and the rear deposition cavity is quadrangular pyramid-shaped.

[0010] Preferably, the belt conveying mechanism further comprises a belt conveyor, and one end of the belt conveyor extends below the front deposition cavity.

[0011] Preferably, the thickness of the limiting ring II is a, the outer diameter is r1, the minimum distance between the two limiting rings I is b, and the inner diameter is r2, wherein a r2.

[0012] Beneficial Effects: Compared with existing technologies, this invention provides a sewage treatment system for subway tunnel shield tunneling. This sewage treatment system has a unique structure and is easy to use. After being collected in the tail sump, sewage is injected into the secondary sedimentation tank of the equipment bridge via a diaphragm pump. The Y-shaped diversion structure of the anti-scour device, combined with the four-sided pyramidal design of the tank bottom, allows the water to settle in a diffuse manner, avoiding direct impact on the sludge at the bottom of the tank. The clear water after initial sedimentation is pumped sequentially into the secondary sedimentation tanks of No. 6 and No. 5 trolleys for gradient filtration, and then further treated by the tertiary sedimentation tanks at the wellhead and the ground, finally meeting the discharge standards. When tank bottom dredging is required, the flushing device is activated: in the initial stage, low-pressure water flows through the gap of the limiting ring to form an annular water film, building a dynamic isolation layer on the sludge surface; when the pressure sensor detects that the water pressure meets the standard, the solenoid valve opens, causing the high-pressure water flow to drive the self-rotating nozzle, using centrifugal force to break up the plated sludge. The broken sludge mixture is discharged to the belt conveyor for external transport through the bottom valve.

[0013] This system achieves graded sedimentation of silt through a five-stage sedimentation system, which significantly reduces the amount of silt carried compared to the traditional single-stage sedimentation mode, effectively avoiding the risk of blockage in sewage pipes. In addition, the intelligent flushing device replaces manual dredging, and the combination of annular water film protection and self-rotating nozzle crushing mode not only prevents secondary pollution during the dredging process, but also improves the efficiency of sludge crushing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the wastewater treatment system of the present invention; Figure 2 This is a schematic diagram of the secondary sedimentation tank of the equipment bridge of the present invention; Figure 3 This is a top view schematic diagram of the secondary sedimentation tank of the equipment bridge of the present invention; Figure 4 This is a three-dimensional schematic diagram of the rinsing mechanism of the present invention; Figure 5 This is a cross-sectional schematic diagram of the rinsing mechanism of the present invention.

[0015] In the diagram: 1. Secondary sedimentation tank of the equipment bridge; 11. Baffle plate; 12. Front sedimentation chamber; 13. Rear sedimentation chamber; 2. Flushing device; 21. Annular hose; 22. Flushing mechanism; 221. Shell; 222. Fixing ring; 223. Limiting ring I; 224. Connecting pipe; 225. Self-rotating nozzle; 226. Frustum; 227. Limiting ring II; 228. Spring; 229. Solenoid valve; 230. Pressure sensor; 3. Anti-bottom erosion device. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Embodiment 1: The present embodiment 1 provides a sewage treatment system in subway tunnel shield construction, the structure is unique, please refer to Figures 1-5 As shown in the drawings, it comprises, from front to back, a device bridge secondary sedimentation tank 1, a No. 6 trolley secondary sedimentation tank, a No. 5 trolley secondary sedimentation tank, a wellhead tertiary sedimentation tank, a ground tertiary sedimentation tank, and a flushing device 2 arranged in the device bridge secondary sedimentation tank 1. The sewage collected at the shield tail is discharged to the municipal pipe network after being precipitated and filtered through the device bridge secondary sedimentation tank 1, the No. 6 trolley secondary sedimentation tank, the No. 5 trolley secondary sedimentation tank, the wellhead tertiary sedimentation tank, and the ground tertiary sedimentation tank.

[0018] A partition plate 11 is fixedly installed inside the device bridge secondary sedimentation tank 1, which divides the device bridge secondary sedimentation tank 1 into a front sedimentation cavity 12 and a rear sedimentation cavity 13, and both the front sedimentation cavity 12 and the rear sedimentation cavity 13 are funnel-shaped. The flushing device 2 comprises a plurality of flushing mechanisms 22 arranged uniformly at the bottom of the front sedimentation cavity 12 along the circumference. The flushing mechanism 22 comprises a shell 221 fixedly connected with the device bridge secondary sedimentation tank 1 and having two open ends, a water inlet of the shell 221 is connected in communication with a high-pressure flushing device of the shield tunneling machine, a fixed ring 222 is fixedly installed in the shell 221, and two limiting rings I 223 are fixedly installed between the fixed ring 222 and the water inlet of the shell 221. A connecting pipe 224 is movably sleeved on the inside of the fixed ring 222, one end of the connecting pipe 224 extends out of the shell 221 and is fixedly installed with a self-rotating spray head 225, and the other end of the connecting pipe 224 extends between the two limiting rings I 223 and is fixedly sleeved with a limiting ring II 227.

[0019] A conical groove is concentrically formed in the water outlet of the shell 221, a circular table 226 is fixedly sleeved on the connecting pipe 224 and does not contact the conical groove, a plurality of through holes are formed in the fixed ring 222, a spring 228 is sleeved on the connecting pipe 224 between the fixed ring 222 and the limiting ring II 227, and an electromagnetic valve 229 and a pressure sensor 230 are fixedly installed in the connecting pipe 224 and are controlled in connection. A blowdown pipe is fixedly installed at the output end of a diaphragm pump of the shield tail of the shield tunneling machine, the other end of the blowdown pipe extends into the primary sedimentation cavity of the device bridge secondary sedimentation tank 1, and a bottom scouring prevention device 3 is arranged at the output end of the blowdown pipe. The bottom scouring prevention device 3 comprises a Y-shaped joint, and a semicircular flow baffle is fixedly installed in each output end of the Y-shaped joint.

[0020] The flushing device 2 further comprises an annular hose 21 fixedly installed at the bottom of the front sedimentation chamber 12, and a plurality of housings 221 are connected with the high-pressure flushing device of the shield tunneling machine through the annular hose 21; the upper portions of the front sedimentation chamber 12 and the rear sedimentation chamber 13 are rectangular, and the lower portions are quadrangular pyramids; the belt conveying mechanism extends to below the front sedimentation chamber 12, the thickness of the limiting ring II 227 is a, the outer diameter is r1, the minimum distance between the two limiting rings I 223 is b, and the inner diameter is r2, wherein a < b, and r1 > r2.

[0021] Working principle: after the shield tunneling machine completes one-ring tunneling, the flushing sewage is collected in the shield tail water collecting pit, the diaphragm pump pumps the sewage into the equipment bridge secondary sedimentation tank 1, the anti-impact bottom device 3 can avoid the water flow from impacting the sludge at the bottom of the front sedimentation chamber 12, and the sedimentation effect of the sludge is enhanced; then the water in the rear sedimentation chamber 13 is sequentially pumped into the No. 6 trolley secondary sedimentation tank, the No. 5 trolley secondary sedimentation tank, the wellhead tertiary sedimentation tank, and the ground tertiary sedimentation tank for sedimentation, and finally is discharged into the municipal pipe network; before the next ring is pushed, the gate valve at the bottom of the flushing device 2 and the front sedimentation chamber 12 is opened, the high-pressure water flow in the shield tunneling machine flows into each housing 221 through the annular hose 21, initially, part of the high-pressure water flow flows into the enclosed area of the fixed ring 222 and the adjacent limiting ring I 223 through the gap between the two limiting rings I 223 and the limiting ring II 227, and then flows to the output end of the housing 221 through the through hole on the fixed ring 222, and then is sprayed out from the gap between the circular table 226 and the conical groove, forming an annular water film, thereby avoiding the sludge from being sucked to the bottom.

[0022] As the water pressure in the water inlet of the housing 221 gradually increases, the limiting ring II 227 will continuously move away from the water inlet under the action of the water pressure, until the limiting ring II 227 is in contact with the limiting ring I 223 away from the water inlet, at this time, the annular water film is not sprayed out, and when the water pressure in the water inlet of the housing 221 reaches the maximum threshold value of the pressure sensor 230, the electromagnetic valve 229 is opened, the high-pressure water flow enters the connecting pipe 224, and is sprayed out from the self-rotating nozzle 225, and at the same time drives the self-rotating nozzle 225 to rotate, thereby crushing the sludge; since the flow rate of the self-rotating nozzle 225 is greater than the flow rate of the water inlet of the housing 221, the water pressure in the water inlet of the housing 221 will gradually decrease, and in this process, the spring 228 will push the limiting ring II 227 back to the starting position, the annular water film and the self-rotating nozzle 225 act on the sludge at the same time, until the water pressure in the water inlet of the housing 221 reaches the minimum threshold value of the pressure sensor 230, at this time, the electromagnetic valve 229 is closed, and the self-rotating nozzle 225 stops working.

[0023] Through the alternate action of the annular water film and the self-rotating nozzle 225, the sludge is better crushed and washed, and the sediment mixture flows from the valve at the bottom of the front sedimentation chamber 12 to the belt conveyor, and is discharged into the soil bucket through the belt conveyor; at the same time, the valve at the bottom of the sedimentation tank in which the sludge in the second-stage sedimentation tank of the No. 6 trolley is opened, and the sediment is discharged into the soil bucket and transported to the outside by the electric cart and directly discharged into the spoil pile.

[0024] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A sewage treatment system for subway tunnel shield construction, characterized in that, The system includes, from front to back, a secondary sedimentation tank (1) on an equipment bridge, a secondary sedimentation tank on a No. 6 trolley, a secondary sedimentation tank on a No. 5 trolley, a tertiary sedimentation tank at the wellhead, and a tertiary sedimentation tank on the ground, all connected by pipes. A flushing device (2) is installed within the secondary sedimentation tank (1) on the equipment bridge. Wastewater collected at the shield tail passes through the secondary sedimentation tank (1) on the equipment bridge, the secondary sedimentation tank on a No. 6 trolley, the secondary sedimentation tank on a No. 5 trolley, the tertiary sedimentation tank at the wellhead, and the tertiary sedimentation tank on the ground, undergoing sedimentation and filtration before being transported to the municipal pipe network. The internal solids of the secondary sedimentation tank (1) on the equipment bridge... A partition (11) is fixedly installed, which divides the secondary sedimentation tank (1) of the equipment bridge into a front sedimentation chamber (12) and a rear sedimentation chamber (13), and both the front sedimentation chamber (12) and the rear sedimentation chamber (13) are funnel-shaped; the flushing device (2) includes a plurality of flushing mechanisms (22) evenly arranged around the bottom of the front sedimentation chamber (12), and the flushing mechanism (22) includes a shell (221) fixedly connected to the secondary sedimentation tank (1) of the equipment bridge and open at both ends, and the water inlet of the shell (221) is connected to the high-pressure flushing device of the tunnel boring machine. A fixing ring (222) is fixedly installed inside the housing (221). Two limiting rings I (223) are fixedly installed at intervals between the fixing ring (222) and the water inlet of the housing (221). A connecting pipe (224) is movably fitted inside the fixing ring (222). One end of the connecting pipe (224) extends out of the housing (221) and is fixedly installed with a self-rotating nozzle (225). The other end extends between the two limiting rings I (223) and is fixedly fitted with a limiting ring II (227). The drain outlet of the housing (221) is concentric. A conical groove is provided, and a frustum (226) is provided in the conical groove. The frustum (226) is fixedly fitted on the connecting pipe (224) and the frustum (226) does not contact the conical groove. The fixing ring (222) has multiple through holes. A spring (228) is fitted on the connecting pipe (224) between the fixing ring (222) and the limiting ring II (227). A solenoid valve (229) and a pressure sensor (230) are fixedly installed in the connecting pipe (224). The solenoid valve (229) and the pressure sensor (230) are connected for control.

2. The wastewater treatment system according to claim 1, characterized in that: The output end of the diaphragm pump at the tail of the tunnel boring machine is fixedly equipped with a sewage pipe. The other end of the sewage pipe extends into the primary sedimentation chamber of the secondary sedimentation tank (1) of the equipment bridge. The output end of the sewage pipe is equipped with an anti-bottom scouring device (3). The anti-bottom scouring device (3) includes a Y-type connector. A semi-circular baffle is fixedly installed in both output ends of the Y-type connector.

3. The wastewater treatment system according to claim 1, characterized in that: The flushing device (2) also includes an annular hose (21) fixedly installed at the bottom of the front sedimentation chamber (12), and multiple housings (221) are connected to the high-pressure flushing device of the tunnel boring machine through the annular hose (21).

4. The wastewater treatment system according to claim 1, characterized in that: The upper part of the front sedimentation chamber (12) and the lower part of the rear sedimentation chamber (13) are both rectangular, and the lower part is both square pyramidal.

5. The wastewater treatment system according to claim 4, characterized in that: It also includes a belt conveyor mechanism, one end of which extends below the front sedimentation chamber (12).

6. The wastewater treatment system according to claim 4, characterized in that: The thickness of the limiting ring II (227) is a, the outer diameter is r1, the minimum distance between the two limiting rings I (223) is b, and the inner diameter is r2, where a r2.

Images