A subway tunnel shield method construction sewage treatment system

Abstract

This invention discloses a wastewater treatment system for subway tunnel shield tunneling, relating to the field of wastewater treatment technology. It includes, sequentially from front to back, a secondary sedimentation tank on the equipment bridge, a secondary sedimentation tank on trolley number six, a secondary sedimentation tank on trolley number five, a tertiary sedimentation tank at the wellhead, and a tertiary sedimentation tank on the ground, all connected by pipes. A flushing device is also included within the secondary sedimentation tank on the equipment bridge. Wastewater collected at the shield tail passes through these five sedimentation tanks. This wastewater treatment system for subway tunnel shield tunneling achieves graded sedimentation of silt through a five-stage sedimentation system, significantly reducing silt load compared to traditional single-stage sedimentation methods and effectively avoiding the risk of clogging of sewage pipes. Furthermore, the combination of annular water film protection and self-rotating nozzle crushing not only prevents secondary pollution during dredging but also improves sludge crushing efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically a wastewater treatment system for subway tunnel shield construction. Background Technology

[0002] In urban subway tunnel construction, earth pressure balance shield tunneling machines are increasingly being used. During the construction process of earth pressure balance shield tunneling machines, a large amount of wastewater is generated when washing the tunnel due to soil falling from the conveyor belt, grout leakage at the shield tail, and spillage of soil during the transportation of soil by battery trucks. The conventional treatment solution is to pump the wastewater at the shield tail into the secondary sedimentation tank on the No. 5 trolley through a diaphragm pump, then pump the settled wastewater into the tertiary sedimentation tank designed at the wellhead through a wastewater pump, then pump the settled wastewater in the tertiary sedimentation tank into the tertiary sedimentation tank on the ground, and finally discharge it into the municipal pipe network.

[0003] The above-mentioned plan has the following problems: 1. Due to the small capacity of the secondary sedimentation tank of No. 5 trolley and the insufficient number of sedimentation stages, the sewage pump will carry a large amount of silt when pumping sewage, causing blockage of the sewage pipes in the tunnel. This requires a lot of manpower to dredge the pipes; 2. The tertiary sedimentation tanks at the wellhead and on the ground also need to be cleaned regularly, otherwise substandard sewage will be discharged into the municipal pipe network; 3. If the tertiary sedimentation tanks on the ground are not cleaned in time, sewage will enter the municipal pipe network, causing blockage of the municipal pipe network and generating significant negative social effects.

[0004] Therefore, it is necessary to propose a sewage treatment system for subway tunnel shield construction to solve the above problems. Summary of the Invention

[0005] Technical problem to be solved: The purpose of this invention is to provide a sewage treatment system for subway tunnel shield construction, so as to solve the problems of small capacity and easy blockage of existing sewage treatment systems mentioned in the background art.

[0006] Technical Solution: To achieve the above objectives, the present invention provides the following technical solution: A sewage treatment system for subway tunnel shield construction, comprising, sequentially from front to back, a secondary sedimentation tank on the equipment bridge, a secondary sedimentation tank on trolley number six, a secondary sedimentation tank on trolley number five, a tertiary sedimentation tank at the wellhead, and a tertiary sedimentation tank on the ground, and a flushing device installed within the secondary sedimentation tank on the equipment bridge. Sewage collected at the shield tail passes through the secondary sedimentation tanks on the equipment bridge, trolley number six, trolley number five, wellhead, and ground, and after sedimentation and filtration, is transported to the municipal pipe network. A partition is fixedly installed inside the secondary sedimentation tank on the equipment bridge, dividing it into a front sedimentation chamber and a rear sedimentation chamber, both of which are funnel-shaped. The flushing device includes multiple flushing mechanisms evenly arranged around the bottom of the front sedimentation chamber, each flushing mechanism being fixedly connected to the secondary sedimentation tank on the equipment bridge. The shield tunnel has a shell with openings at both ends. The inlet of the shell is connected to the high-pressure flushing device of the shield machine. A fixing ring is fixedly installed inside the shell, and two limiting rings I are fixedly installed at intervals between the fixing ring and the inlet of the shell. A connecting pipe is movably fitted inside the fixing ring. One end of the connecting pipe extends out of the shell and is fixedly fitted with a self-rotating nozzle, and the other end extends between the two limiting rings I and is fixedly fitted with a limiting ring II. 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, where a < b, r1 > r2. A concentric conical groove is opened in the drain outlet of the shell. A frustum is provided in the conical groove. The frustum is fixedly fitted on the connecting pipe and does not contact the conical groove. Multiple through holes are opened on the fixing ring. A spring is fitted on the connecting pipe between the fixing ring and the limiting ring II, and a solenoid valve and a pressure sensor are fixedly installed inside the connecting pipe. The solenoid valve and the pressure sensor are connected for control.

[0007] Preferably, a sewage pipe is fixedly installed at the output end of the diaphragm pump at the tail of the tunnel boring machine, and the other end of the sewage pipe extends into the primary sedimentation chamber of the secondary sedimentation tank of the equipment bridge. The output end of the sewage pipe is equipped with an anti-bottom-rush device, which includes a Y-type connector. Semi-circular baffles are fixedly installed in both output ends of the Y-type connector.

[0008] Preferably, the flushing device further includes an annular hose fixedly installed at the bottom of the front sedimentation chamber, and multiple housings are connected to the high-pressure flushing device of the tunnel boring machine through the annular hose.

[0009] Preferably, the upper part of both the front sedimentation chamber and the rear sedimentation chamber is rectangular, and the lower part is a square pyramid.

[0010] Preferably, it also includes a belt conveyor mechanism, one end of which extends below the front sedimentation chamber.

[0011] 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.

[0012] 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

[0013] Figure 1 This is a schematic diagram of the wastewater treatment system of the present invention;

[0014] Figure 2 This is a schematic diagram of the secondary sedimentation tank of the equipment bridge of the present invention;

[0015] Figure 3 This is a top view schematic diagram of the secondary sedimentation tank of the equipment bridge of the present invention;

[0016] Figure 4 This is a three-dimensional schematic diagram of the rinsing mechanism of the present invention;

[0017] Figure 5 This is a cross-sectional schematic diagram of the rinsing mechanism of the present invention.

[0018] 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

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1: This example 1 provides a sewage treatment system for subway tunnel shield construction, featuring a unique structure. Please refer to [link / reference]. Figure 1-5 As shown, the system includes, from front to back, a secondary sedimentation tank 1 on the equipment bridge, a secondary sedimentation tank on trolley number six, a secondary sedimentation tank on trolley number five, 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 in the secondary sedimentation tank 1 on the equipment bridge. Wastewater collected at the tail of the shield passes through the secondary sedimentation tank 1 on the equipment bridge, the secondary sedimentation tank on trolley number six, the secondary sedimentation tank on trolley number five, the tertiary sedimentation tank at the wellhead, and the tertiary sedimentation tank on the ground. After sedimentation and filtration, the wastewater is discharged into the municipal pipe network.

[0021] A partition 11 is fixedly installed inside the secondary sedimentation tank 1 of the equipment bridge. The partition 11 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. 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. 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 shell 221. Two limiting rings I 223 are fixedly installed at intervals between the fixing ring 222 and the water inlet of the shell 221. A connecting pipe 224 is movably fitted inside the fixing ring 222. One end of the connecting pipe 224 extends out of the shell 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.

[0022] A concentric conical groove is formed inside the drain outlet of the shell 221. A frustum 226 is provided inside the conical groove. The frustum 226 is fixedly fitted onto the connecting pipe 224, and the frustum 226 does not contact the conical groove. Multiple through holes are formed on the fixing ring 222. 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 inside the connecting pipe 224. The solenoid valve 229 and the pressure sensor 230 are connected for control. A sewage pipe is fixedly installed at the output end of the diaphragm pump at the tail of the tunnel boring machine. The other end of the sewage pipe extends into the primary sedimentation chamber of the secondary sedimentation tank 1 of the equipment bridge. An anti-surge device 3 is provided at the output end of the sewage pipe. The anti-surge device 3 includes a Y-type connector. Semi-circular baffles are fixedly installed in both output ends of the Y-type connector.

[0023] The flushing device 2 also includes an annular hose 21 fixedly installed at the bottom of the front sedimentation chamber 12. Multiple housings 221 are connected to the high-pressure flushing device of the tunnel boring machine through the annular hose 21. The upper part of the front sedimentation chamber 12 and the rear sedimentation chamber 13 are both rectangular, and the lower part is both quadrangular pyramidal. It also includes a belt conveyor mechanism. One end of the belt conveyor mechanism extends to the bottom of 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, where a < b, r1 > r2.

[0024] Working principle: After the tunnel boring machine completes one ring of excavation, the flushing wastewater is collected through the tail sump. A diaphragm pump then pumps the wastewater to the secondary sedimentation tank 1 on the equipment bridge. The anti-scouring device 3 prevents the water flow from impacting the sludge at the bottom of the front sedimentation chamber 12, enhancing the sludge settling effect. Then, a water pump sequentially pumps the clean water from the rear sedimentation chamber 13 to the secondary sedimentation tanks on the No. 6 and No. 5 trolleys, the wellhead tertiary sedimentation tank, and the surface tertiary sedimentation tank for sedimentation, finally discharging it into the municipal sewer network. Before advancing the next ring, the system is activated... The flushing device 2 and the gate valve at the bottom of the front sedimentation chamber 12 allow high-pressure water from inside the tunnel boring machine to flow into each housing 221 through the annular hose 21. Initially, some of the high-pressure water flows into the area enclosed by the fixed ring 222 and the adjacent fixed ring 1223 through the gap between the two limiting rings I 223 and II 227, and then flows to the output end of the housing 221 through the through hole on the fixed ring 222. It is then sprayed out from the gap between the frustum 226 and the conical groove to form an annular water film, thereby preventing sludge from being sucked to the bottom.

[0025] As the water pressure inside the inlet of housing 221 gradually increases, the limiting ring II 227 will continuously move away from the inlet under the action of water pressure until the limiting ring II 227 contacts the limiting ring I 223 on the side away from the inlet. At this time, the annular water film will no longer be sprayed out. When the water pressure inside the inlet of housing 221 reaches the maximum threshold of pressure sensor 230, the solenoid valve 229 opens, and high-pressure water flows into the connecting pipe 224 and is sprayed out from the self-rotating nozzle 225, simultaneously driving the self-rotating nozzle 22... 5. The nozzle rotates to break up the sludge. Since the flow rate of the self-rotating nozzle 225 is greater than the flow rate input through the inlet of the housing 221, the water pressure inside the inlet of the housing 221 will gradually decrease. During this process, the spring 228 will push the limit ring II 227 back to the starting position. The annular water film and the self-rotating nozzle 225 act on the sludge simultaneously until the water pressure inside the inlet of the housing 221 reaches the minimum threshold of the pressure sensor 230. At this time, the solenoid valve 229 closes and the self-rotating nozzle 225 stops operating.

[0026] Through the alternating action of the annular water film and the self-rotating nozzle 225, the sludge is better crushed and flushed. The sludge mixture flows from the valve at the bottom of the front sedimentation chamber 12 to the belt conveyor and is discharged into the soil hopper by the belt conveyor. At the same time, the valve at the bottom of the sedimentation tank where the sludge in the secondary sedimentation tank of the No. 6 trolley is located is opened, and the sediment is discharged into the soil hopper and transported to the outside by a battery-powered vehicle, and directly discharged into the slag pond.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sewage treatment system in a subway tunnel shield method construction, characterized by, The system includes, from front to back, a secondary sedimentation tank (1) for the equipment bridge, a secondary sedimentation tank for trolley No. 6, a secondary sedimentation tank for trolley No. 5, 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 inside the secondary sedimentation tank (1) of the equipment bridge. Wastewater collected at the shield tail passes through the secondary sedimentation tank (1) of the equipment bridge, the secondary sedimentation tank for trolley No. 6, the secondary sedimentation tank for trolley No. 5, the tertiary sedimentation tank at the wellhead, and the tertiary sedimentation tank on the ground, and is then sedimented, filtered, and transported to the municipal pipe network. A partition (11) is fixedly installed inside the secondary sedimentation tank (1). The secondary sedimentation tank (1) of the equipment bridge is divided 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), 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, the inlet of the shell (221) is connected to the high-pressure flushing device of the tunnel boring machine, and a fixing ring (222) is fixedly installed inside the shell (221), the fixing ring (222) and the Two limiting rings I (223) are fixedly installed at intervals between the water inlets 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), and the other end extends between the two limiting rings I (223) and is fixedly fitted with a limiting ring II (227); 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 < b, r1 > r2; The drain outlet of the housing (221) is concentrically provided with a conical groove, 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) is provided with 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).

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