CN212450900U

CN212450900U - Shield constructs quick-witted sewage treatment system

Info

Publication number: CN212450900U
Application number: CN202020846979.5U
Authority: CN
Inventors: 吴俊呈; 刘振东; 刘铮; 郭桃明; 张建康; 杜殿逵; 张琪; 阮应书; 高文涛; 严武; 郭宏业
Original assignee: China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Current assignee: China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-02-02
Anticipated expiration: 2030-05-20

Abstract

The utility model provides a shield constructs quick-witted sewage treatment system. The treatment system comprises a diaphragm pump, a first sewage discharge pipe, a sedimentation tank cleaning device, a third sedimentation tank arranged at the tail part of the fifth trolley and a sewage discharge pump arranged in a third sedimentation chamber of the third sedimentation tank, wherein the water inlet end of the diaphragm pump extends into a shield tail water accumulation area, the water outlet end of the diaphragm pump extends into a filter box at the inlet of a first-stage sedimentation chamber of the third sedimentation tank through a water discharge pipe, a three-way joint A is arranged on the water discharge pipe, the water inlet end of the first sewage discharge pipe is connected with the water outlet end of the sewage discharge pump, and the water outlet end of the first sewage discharge pipe extends into the sedimentation tank of an end; the sedimentation tank cleaning device comprises a second blow-off pipe connected with a water outlet of the blow-off pump and a vent pipe arranged at the bottom of the third-level sedimentation tank, wherein the vent pipe penetrates through three sedimentation cavities of the third-level sedimentation tank. The utility model discloses a solve the discharge problems of shield structure afterbody sewage, avoided sewage to block up the discharge piping, can utilize partial sewage simultaneously, reduced the water cost, practiced thrift construction cost.

Description

Shield constructs quick-witted sewage treatment system

Technical Field

The utility model discloses the device relates to a sewage pump drainage device is applicable to the effluent water sump clearance, especially a shield constructs quick-witted sewage treatment system to long distance urban rail shield constructs sewage treatment during method construction.

Background

With the rapid development of the contemporary society, urban rail construction is a major branch of municipal engineering, and most of the urban rail construction is underground construction, so shield construction is a common construction method in urban rail construction. Because the shield constructs in underground construction, often meets the muddy water layer, especially under the advanced and more complicated geological condition of river system, can produce a large amount of sewage in the shield construction process, its sewage mud content is big, and can contain more grease and chemical in the sewage, and the sewage discharge volume in the shield construction process is great in addition, and a large amount of sewage discharge just can lead to the serious pollution of urban groundwater. Particularly, during shield construction, accumulated water in a shield tail assembly area contains a large amount of impurities, the impurities can be deposited in a trolley sewage pool and a sewage pool of an originating well, the sludge in the sewage pool is fully accumulated in the construction process, even a tunnel sewage pipeline is blocked in the pumping and draining process, a pump body is damaged, and the like, so that the problems of coexistence are caused, manual cleaning is needed, and the incoordination among the working procedures is caused. In the shield construction process, the situation of water addition is often met, for example, in the shield normal tunneling state process, a storage battery car is needed for an earth pressure balance shield machine to realize horizontal transportation, and during the feeding and slag discharging processes, due to the fact that stratum soil has adhesiveness, the soil is easy to adhere to the two sides and the bottom of a slag-soil bucket, and related personnel are often needed to specially add water for wetting, so that water sources are wasted. Therefore, how to treat the sewage generated in the shield construction process becomes an important problem in the construction.

Disclosure of Invention

The utility model discloses to shield structure sewage discharge problem in the work progress, provide a shield structure machine sewage treatment system, this sewage treatment system both can solve sewage discharge's problem, and the precipitate leads to the problem that pump drainage pipeline blockked up and the pump body is harm in avoiding sewage, can utilize sewage discharge again to moisten the dregs fill, reduces the water cost.

In order to achieve the technical purpose, the utility model provides a shield constructs quick-witted sewage treatment system, the treatment system includes diaphragm pump, tertiary sedimentation tank, dredge pump, first blow-off pipe and sedimentation tank belt cleaning device, the water inlet end of diaphragm pump stretches into shield tail ponding district through the inlet tube, and is equipped with the filter head at the water absorption end of inlet tube; the three-stage sedimentation tank is arranged at the tail part of the fifth trolley, a filter box is arranged at the inlet of the first-stage sedimentation cavity of the three-stage sedimentation tank, a drain valve is arranged at the bottom of the third-stage sedimentation cavity, the water outlet end of the diaphragm pump extends into the filter box at the inlet of the first-stage sedimentation cavity of the three-stage sedimentation tank through the drain pipe, and a three-way joint A is arranged on the drain pipe; the sewage pump is arranged in a tertiary sedimentation cavity of the tertiary sedimentation tank, the water inlet end of the first sewage discharge pipe is connected with the water outlet end of the sewage pump, and the water outlet end of the first sewage discharge pipe extends into the sedimentation tank of the end starting well; the sedimentation tank cleaning device comprises a second blow-off pipe and a vent pipe arranged at the bottom of the third-level sedimentation tank, wherein the vent pipe penetrates through three sedimentation chambers of the third-level sedimentation tank, a plurality of vent holes are formed in the position, where each sedimentation chamber is arranged in the vent pipe, of each sedimentation chamber, the water inlet end of the second blow-off pipe is connected with the water outlet of the sewage pump, the water outlet end of the second blow-off pipe leads to a slag and soil bucket matched with the storage battery car, and a control valve is arranged on the second blow-.

The utility model discloses further technical scheme: and a third port of the three-way joint A is communicated with the soil outlet through a muck bucket water inlet pipe, and a butterfly valve is arranged on the muck bucket water inlet pipe.

The utility model discloses further technical scheme: the drain pipe is provided with a one-way valve which is arranged in front of the three-way joint A.

The utility model discloses better technical scheme: the diaphragm pump is a pneumatic diaphragm pump and is communicated with an air compression system of the shield tunneling machine through an air pipe connector, and power is provided for the diaphragm pump through the air compression system of the shield tunneling machine.

The utility model discloses better technical scheme: the air inlet end of the vent pipe is communicated with the air supply end of the air compression system of the shield tunneling machine through an air pipe, an air inlet control valve is arranged at the air inlet end, and a blocking ball valve is arranged at the tail end of the vent pipe.

The utility model discloses better technical scheme: the first sewage discharge pipe and the second sewage discharge pipe are the same pipeline communicated through the three-way joint B, the first joint of the three-way joint B is connected with the sewage pump through a pipeline, the second joint is communicated into the end starting well sedimentation tank through a pipeline, and the third joint is communicated into the storage battery car matching residue soil bucket through a pipeline and is provided with a butterfly valve on the pipeline communicated with the storage battery car matching residue soil bucket.

The utility model discloses better technical scheme: the three-stage sedimentation tank is divided into three-stage sedimentation chambers by a first-stage screen plate and a second-stage screen plate, wherein the mesh diameter of the first-stage screen plate between the first-stage sedimentation chamber and the second-stage sedimentation chamber is 3mm, and the mesh diameter of the second-stage screen plate between the second-stage sedimentation chamber and the third-stage sedimentation chamber is 1.5 mm; the diameter of the filtering hole on the filtering box is 2 cm.

The utility model discloses better technical scheme: the bottom of the third-level sedimentation cavity is lower than the bottom surfaces of the first-level sedimentation cavity and the second-level sedimentation cavity, and the sewage pump is suspended in the concave area at the bottom of the third-level sedimentation cavity through a suspension gourd.

The utility model discloses better technical scheme: and a reserved water pipe joint is arranged in the shield tail water accumulation area, and a filter head is arranged at the water outlet end of the reserved water pipe joint.

The utility model discloses better technical scheme: the widths of the first-level precipitation cavity, the second-level precipitation cavity and the third-level precipitation cavity are 1m, 0.6m and 0.4m in sequence.

The utility model has the advantages that:

(1) the utility model discloses a drainage system includes the diaphragm pump, sets up tertiary sedimentation tank, the sewage discharge pipeline at No. five platform truck afterbody, and the diaphragm pump can pump sewage to the tertiary sedimentation tank through the sewage discharge pipeline, deposits the back and deposits temporarily, guarantees shield tail operation and normally goes on in order; the sewage can be pumped and discharged into the residue soil bucket, the problem that due to the fact that stratum soil has adhesiveness, the soil is easy to adhere to the two sides and the bottom of the residue soil bucket, and water is often needed to be added and wetted by related personnel is solved, and the water consumption cost is reduced.

(2) The utility model discloses the sewage of tertiary sedimentation tank can directly discharge the end well sewage sedimentation tank of starting after filtering many times and deposiing, has reduced the volume of precipitate in the end well, makes the sedimentation tank clearance of end well bring the convenience.

(3) The utility model discloses a tertiary sedimentation tank still is equipped with cleaning system, including the air duct, its air duct is connected with the air compression system of shield structure machine itself, utilizes the air compression system that shield constructs this Shen of machine to ventilate and stirs the sewage in the three sedimentation intracavity, has avoided a large amount of sediments to pile up and has caused the jam of washing difficulty or discharge pipeline in the sedimentation tank, and the sewage that homogenizes can directly discharge the sediment soil through the drain pump and fight.

(4) The utility model discloses a diaphragm pump is pneumatic diaphragm pump, can directly utilize the air compression system of shield structure machine itself to provide power, and the port of absorbing water of diaphragm pump is equipped with the filter head and carries out primary treatment, avoids a large amount of dregs to get into the diaphragm pump, leads to the film damage of diaphragm pump and blocks up the pump body;

(5) the shield water accumulation area is also provided with a reserved water pipe joint which can be connected with an external water pipe, water can be added to the shield tail to dilute the slurry concentration of the shield, and the problem that the diaphragm pump is damaged due to water shortage can be solved.

(6) Still be equipped with the check valve on sewage discharge pipeline, prevent because of the air compression system closes the back, the former way of sewage returns to the shield tail in the pipeline and influences the operating efficiency.

The utility model has simple structure, solves the problem of discharging sewage at the tail part of the shield, refuges the sewage to block the discharge pipeline, ensures the normal and orderly operation of the tail part of the shield, solves the coordination between related processes in the construction process, and prolongs the service life of the shield equipment; meanwhile, partial sewage can be utilized, the water cost is reduced, the construction cost is saved, the labor tasks are reduced, and the shield construction method tends to a mechanical and intelligent operation process.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the internal structure of a three-stage sedimentation tank;

fig. 3 is a schematic diagram of a screen structure of a three-stage sedimentation tank.

In the figure: 1-diaphragm pump, 100-water inlet pipe, 101-filter head, 102-air pipe joint, 2-third stage sedimentation tank, 200-first stage sedimentation chamber, 201-filter box, 202-third stage sedimentation chamber, 203-drain valve, 204-first stage screen plate, 205-second stage screen plate, 206-second stage sedimentation chamber, 3-fifth stage trolley, 4-shield tail water accumulation area, 5-drain pipe, 500-three way joint A, 501-one-way valve, 6-sewage pump, 7-first sewage drain pipe, 700-three way joint B, 8-end starting well sedimentation tank, 9-vent pipe, 900-vent hole, 901-plugging ball valve, 902-air inlet control valve, 10-second sewage drain pipe, 11-storage battery car matching residue soil bucket, 12-residue soil bucket water inlet pipe, 13-air compression system, 14-hanging calabash, 15-soil outlet, 16-reserved water pipe joint.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 3 are drawings of the embodiment, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The shield machine sewage treatment system provided by the embodiment comprises a diaphragm pump 1, a three-stage sedimentation tank 2, a sewage pump 6, a first sewage discharge pipe 7 and a sedimentation tank cleaning device, wherein the diaphragm pump 1 is connected with the first sewage discharge pipe 7; the diaphragm pump 1 is a pneumatic diaphragm pump, is communicated with an air compression system 13 of the shield tunneling machine through an air pipe connector 102, and provides power for the diaphragm pump 1 through the air compression system 13 of the shield tunneling machine; the inlet end of diaphragm pump 1 stretches into shield tail stagnant water district 4 through inlet tube 100 in to the end that absorbs water at inlet tube 100 is equipped with filter head 101, can carry out primary treatment to the sewage of shield tail stagnant water district 4, avoids a large amount of dregs to get into the diaphragm pump, leads to the film of diaphragm pump to damage and block up the pump body, in the outlet end of diaphragm pump 1 stretches into the filter box 201 of the import department of the one-level sedimentation chamber 200 of tertiary sedimentation tank 2 through drain pipe 5, the diameter of the filtration pore of filter box 201 is 2cm, can filter the sediment that the diameter is greater than 2 cm. Be equipped with three way connection A500 on drain pipe 5 three port of three way connection A500 leads to the position of unearthing mouth 15 through dregs fill inlet tube 12 to can be when dregs fill transports unearthing mouth 15 department, directly transport away in the dregs fill with sewage pump drainage, need not pass through tertiary sedimentation tank 2, and sewage can also be fought to dregs and wet, solved because of stratum soil has the adhesion, the easy adhesion is equipped with the butterfly valve on dregs fill inlet tube 12 in dregs fill both sides and bottom, and control. The drain pipe 5 is also provided with a one-way valve 501, and the one-way valve 501 is arranged in front of the three-way joint A500, so that the influence on the operation efficiency caused by the return of the original sewage path in the pipeline to the shield tail after the air compression system is closed is avoided. Still be equipped with in shield tail ponding district 4 and reserve water pipe joint 16, the play water end of reserving water pipe joint 16 is equipped with the filter head, and reserve water pipe joint 16 can external water pipe, can add water to the shield tail, dilutes the mud concentration of shield to can protect the diaphragm pump because the problem that the damage appears in the lack of water.

According to the shield tunneling machine sewage treatment system provided by the embodiment, as shown in fig. 1 and 2, the third-stage sedimentation tank 2 is installed at the tail part of the fifth trolley 3, and the volume of the third-stage sedimentation tank 2 is 3m³And the size is 1m multiplied by 2m multiplied by 1.5m, the filter box 201 is arranged at the water inlet position at the upper edge of the sewage tank, the filter box 201 can be arranged in a drawer mode, and can also be directly fixed at the edge of the sedimentation tank through bolts or buckles, so that the filter box can be conveniently disassembled, assembled and cleaned. Two stages of screen plates are arranged in the third-stage sedimentation tank 2 along the length direction to divide the third-stage sedimentation tank into three stages of sedimentation cavities, wherein the widths of the first-stage sedimentation cavity 200, the second-stage sedimentation cavity 206 and the third-stage sedimentation cavity 202 are 1m, 0.6m and 0.4m in sequence, the mesh diameter of the first-stage screen plate 204 between the first-stage sedimentation cavity 200 and the second-stage sedimentation cavity 206 is 3mm, and the mesh diameter of the second-stage screen plate 205 between the second-stage sedimentation cavity 206 and the third-stage sedimentation cavity 202 is 1.5 mm. The bottom of the third-stage settling chamber 202 protrudes downwards to form a concave chamber, and the bottom of the concave area of the third-stage settling chamber 202 is provided with a drain valve 203. The sewage pump 6 is suspended in a downward convex area at the bottom of the third-level settling chamber 202 through the suspension hoist 14, the suspension hoist 14 is installed at the tail of the fifth trolley 3, a support can be built at the tail of the fifth trolley 3 and used for installing the suspension hoist 14, the water inlet end of the first sewage discharge pipe 7 is connected with the water outlet end of the sewage pump 6, and the water outlet end of the first sewage discharge pipe extends into the settling pond 8 of the end starting well.

The embodiment provides a shield constructs quick-witted sewage treatment system, as shown in fig. 1, sedimentation tank belt cleaning device includes second blow off pipe 10 and arranges the breather pipe 9 in 2 bottoms of tertiary sedimentation tank in, as shown in fig. 2, the inlet end of breather pipe 9 passes through the air pipe and communicates with the air feed end of the air compression system 13 of shield machine to be equipped with into air control valve 902 at the inlet end, be equipped with shutoff ball valve 901 at the end of breather pipe 9, breather pipe 9 sets up two-way switch, applies paint anti-rust paint, guarantees life. The breather pipe 9 runs through three sedimentation chamber of tertiary sedimentation tank 2 to a plurality of air vents 900 have been seted up at the position that every sedimentation chamber was arranged in to breather pipe 9, breather pipe 9 can be ventilated and conveniently clear up after stirring the dilution with sewage to tertiary sedimentation intracavity. The water inlet end of the second sewage discharge pipe 10 is connected with the water outlet of the sewage pump 6, the water outlet end of the second sewage discharge pipe is communicated with the residual soil bucket 11 matched with the battery car, and the second sewage discharge pipe 10 is provided with a control valve. As shown in figure 1, the second sewage discharge pipe 10 and the first sewage discharge pipe 7 are the same pipeline communicated through a three-way joint B700, the first joint of the three-way joint B700 is connected with a sewage pump 6 through a pipeline, the second joint is communicated into an end starting well sedimentation tank 8 through a pipeline, the third joint is communicated into a storage battery car matched slag bucket 11 through a pipeline, and a butterfly valve is arranged on the pipeline communicated with the storage battery car matched slag bucket 11.

The utility model discloses a use, work as the utility model discloses when carrying out sewage discharge, need close breather pipe 9's air inlet control valve 902, close the butterfly valve on the second blow off pipe 10 this moment, open 1 air pipe connector 102 of diaphragm pump and go up the control valve, air compression system 13 through the shield structure machine provides power for diaphragm pump 1, diaphragm pump 1 begins to work, with the sewage suction drain pipe 5 in shield tail ponding district 4, and close and be equipped with the butterfly valve on the sediment soil fill inlet tube 12, the sewage in the drain pipe 5 directly discharges in tertiary sedimentation tank 2 this moment, through filter box 201, one-level otter board 204 and second grade otter board 205 filter in proper order and then discharge in tertiary sedimentation chamber 202, then in pumping sewage to first blow off pipe 7 through dredge pump 6, the sewage after the filtration directly discharges and handles in the end sedimentation tank 8 that starts. When sewage is discharged into the muck bucket of the battery car, the muck bucket is transported to the muck outlet 15, the butterfly valve is arranged on the water inlet pipe 12 of the muck bucket after the muck bucket is opened, and the sewage can be directly discharged into the muck bucket transported to the muck outlet 15.

In the sewage discharge process, in order to avoid sediment accumulation, the clearance that goes on tertiary sedimentation tank 2 is carried out to the interval certain time (generally two or three days), when tertiary sedimentation tank 2 washs, directly open air intake control valve 902 of breather pipe 9, let in gas to three sedimentation intracavity through shield structure machine's air compression system 13 to add the clear water through reservation water pipe joint 16 according to sewage concentration, utilize breather pipe 9 to ventilate and stir dilution precipitate, and select corresponding switch to take out the row in appointed position.

The utility model is mainly used for pumping and draining shield tail assembly area accumulated water during shield construction, but the blockage phenomenon occurs during pumping and draining because of the existence of a large amount of impurities in the accumulated water, and a filter head is additionally arranged at the position of a suction pipe of a shield tail diaphragm pump for primary treatment, so that the thin film and the blocked pump body are not easy to damage when the thin film passes through the diaphragm pump; the pipeline is additionally provided with the one-way valve, so that the phenomenon that the operation efficiency is influenced by returning the original sewage path in the pipeline to the shield tail after the air compression system is closed is avoided; the tail part of the pipeline is additionally provided with a tee joint, so that the sewage discharge position is selected under different working conditions, the utilization value is increased, and the operation procedures are reduced. When carrying out the effluent water sump clearance after the interval certain time, add the clear water according to concentration, utilize the breather pipe to ventilate and stir dilution precipitate, make things convenient for sewage pump drainage, light effectual avoiding is piled up the difficulty that causes in a large number. The utility model discloses design tee bend component and butterfly valve switch in different positions for the sewage discharge process is simple, and promotes reuse value.

To sum up, for the utility model discloses an embodiment of listing, nevertheless the utility model discloses not only be limited to above-mentioned embodiment, as long as reach with any same or similar means the technical effect of the utility model, all should belong to the scope of the protection of the utility model.

Claims

1. The utility model provides a shield constructs quick-witted sewage treatment system which characterized in that: the treatment system comprises a diaphragm pump (1), a three-stage sedimentation tank (2), a sewage pump (6), a first sewage discharge pipe (7) and a sedimentation tank cleaning device, wherein a water inlet end of the diaphragm pump (1) extends into the shield tail water accumulation area (4) through a water inlet pipe (100), and a water suction end of the water inlet pipe (100) is provided with a filter head (101); the three-stage sedimentation tank (2) is arranged at the tail part of the fifth trolley (3), a filter box (201) is arranged at the inlet of a first-stage sedimentation cavity (200) of the three-stage sedimentation tank (2), a drain valve (203) is arranged at the bottom of the third-stage sedimentation cavity (202), the water outlet end of the diaphragm pump (1) extends into the filter box (201) at the inlet of the first-stage sedimentation cavity (200) of the three-stage sedimentation tank (2) through a drain pipe (5), and a three-way joint A (500) is arranged on the drain pipe (5); the sewage pump (6) is arranged in a three-stage sedimentation cavity (202) of the three-stage sedimentation tank (2), the water inlet end of the first sewage discharge pipe (7) is connected with the water outlet end of the sewage pump (6), and the water outlet end of the first sewage discharge pipe extends into the sedimentation tank (8) of the end starting well; sedimentation tank belt cleaning device includes second blow off pipe (10) and arranges breather pipe (9) of tertiary sedimentation tank (2) bottom in, breather pipe (9) run through the three sedimentation chamber of tertiary sedimentation tank (2) to a plurality of air vents (900) have been seted up at the position of arranging every sedimentation chamber in breather pipe (9), and the end of intaking of second blow off pipe (10) is connected with the delivery port of dredge pump (6), and the end of water outlet accesss to the supporting dregs fill of storage battery car (11), and is equipped with the control valve on second blow off pipe (10).

2. The shield tunneling machine sewage treatment system according to claim 1, characterized in that: and a third port of the three-way joint A (500) is communicated to the soil outlet (15) through the muck bucket water inlet pipe (12), and a butterfly valve is arranged on the muck bucket water inlet pipe (12).

3. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: the drain pipe (5) is provided with a one-way valve (501), and the one-way valve (501) is arranged in front of the three-way joint A (500).

4. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: the diaphragm pump (1) is a pneumatic diaphragm pump and is communicated with an air compression system (13) of the shield tunneling machine through an air pipe connector (102), and power is provided for the diaphragm pump (1) through the air compression system (13) of the shield tunneling machine.

5. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: the air inlet end of the vent pipe (9) is communicated with the air supply end of an air compression system (13) of the shield tunneling machine through an air pipe, an air inlet control valve (902) is arranged at the air inlet end, and a blocking ball valve (901) is arranged at the tail end of the vent pipe (9).

6. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: first blow off pipe (7) and second blow off pipe (10) are the same pipeline through three way connection B (700) intercommunication, and the first joint of three way connection B (700) is passed through the pipeline and is connected with dredge pump (6), and the second connects in leading to end well sedimentation tank (8) of starting through the pipeline, and the third connects in leading to the supporting dregs fill of storage battery car (11) through the pipeline to be equipped with the butterfly valve on the pipeline that leads to the supporting dregs fill of storage battery car (11).

7. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: the three-stage sedimentation tank (2) is internally divided into three-stage sedimentation chambers by a first-stage screen plate (204) and a second-stage screen plate (205), wherein the mesh diameter of the first-stage screen plate (204) between the first-stage sedimentation chamber (200) and the second-stage sedimentation chamber (206) is 3mm, and the mesh diameter of the second-stage screen plate (205) between the second-stage sedimentation chamber (206) and the third-stage sedimentation chamber (202) is 1.5 mm; the diameter of a filtering hole on the filtering box (201) is 2 cm.

8. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: the bottom of the third-level settling chamber (202) is lower than the bottom surfaces of the first-level settling chamber and the second-level settling chamber, and the sewage pump (6) is suspended in the concave area at the bottom of the third-level settling chamber (202) through a suspension gourd (14).

9. The shield tunneling machine sewage treatment system according to claim 1 or 2, wherein: a reserved water pipe joint (16) is arranged in the shield tail water accumulation area (4), and a filter head is arranged at the water outlet end of the reserved water pipe joint (16).

10. The shield tunneling machine sewage treatment system according to claim 7, wherein: the widths of the primary sedimentation cavity (200), the secondary sedimentation cavity (206) and the tertiary sedimentation cavity (202) are 1m, 0.6m and 0.4m in sequence.