CN112832353A

CN112832353A - Urban underground sewage pipeline laying system

Info

Publication number: CN112832353A
Application number: CN202110049444.4A
Authority: CN
Inventors: 林立忠; 刘泉; 黄顺其
Original assignee: Foshan Nanhai Municipal Engineering Co ltd
Current assignee: Foshan Nanhai Municipal Engineering Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-05-25

Abstract

The application relates to a system for laying urban underground sewage pipelines, which comprises: the rainwater branch pipes are communicated with the sewage branch pipes; the rainwater infiltration structure is arranged at the rainwater outlet, and the water outlet end of the rainwater infiltration structure is communicated with the rainwater branch pipe; the intercepting well structure is arranged on the sewage branch pipe; the intercepting water outlet end of the intercepting well structure is communicated with the main sewage discharge pipe which is used for being communicated with a sewage treatment plant; the overflow water outlet end of the intercepting well structure is communicated with the main rainwater pipe which is used for being communicated with natural water. According to the scheme, no power source is adopted, the rainwater and sewage shunting discharge is realized by utilizing the unpowered structure, the drainage capacity of a municipal drainage system is improved, the treatment load of a sewage treatment plant in rainy days is effectively relieved, the pollution to natural water is reduced, and the energy conservation and environmental protection are realized.

Description

Urban underground sewage pipeline laying system

Technical Field

The application relates to the field of municipal drainage, in particular to a municipal underground sewage pipeline laying system.

Background

The combined flow system is a drainage mode for collecting and conveying sewage and wastewater by using the same pipe system. According to different disposal modes after the sewage, the wastewater and the precipitation runoff are collected, the system can be divided into a direct-discharge type confluence system and a shutoff type confluence system, the direct-discharge type confluence system is the oldest confluence system, the arrangement characteristics of the direct-discharge type confluence system are similar to those of a rainwater pipe canal, and the direct-discharge type confluence system is an old confluence system drainage system which needs to be reconstructed due to serious pollution to a water body. The intercepting type confluence system is to discharge domestic sewage, industrial wastewater and rainwater converged in a street pipe canal to an intercepting main pipe along a river, and all the sewage is conveyed to a sewage treatment plant in sunny days; in rainy days, when the mixed water quantity of the rainwater, the domestic sewage and the industrial wastewater exceeds a certain quantity, the excess part of the mixed water is discharged into a water body through an overflow well.

At present, a direct-discharge type combined system drainage system is mainly used in old urban areas, sewage is directly discharged to a sewage treatment plant in sunny days, the sewage treatment plant treats the sewage, and the treated sewage is directly discharged into natural water or recycled; in rainy days, rainwater and sewage are mixed together and flow to a sewage treatment plant, so that the treatment load of the sewage treatment plant is increased rapidly, and the sewage treatment plant can only directly discharge a part of mixed flow rainwater and sewage into natural water bodies so as to avoid urban waterlogging.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: the direct discharge of mixed rain sewage into natural water body can cause serious pollution of natural water body, which is not favorable for environmental protection.

Disclosure of Invention

In order to help improve the drainage treatment capacity of the urban drainage system, the application provides an urban underground sewage pipeline laying system.

The utility model provides a system for laying urban underground sewage pipelines adopts following technical scheme:

an urban underground sewer piping system comprising: the rainwater collecting system comprises a sewage branch pipe and rainwater branch pipes, wherein a plurality of rainwater branch pipes are communicated with the sewage branch pipe; the rainwater infiltration structure is arranged at the rainwater outlet, the water outlet end of the rainwater infiltration structure is communicated with the rainwater branch pipe, and the rainwater infiltration structure is used for filtering part of initial rainwater and guiding the flow; the intercepting well structure is arranged on the sewage branch pipe and comprises a water inlet distribution well chamber, an intercepting valve well chamber and a duckbill valve well chamber, wherein the water inlet end of the water inlet distribution well chamber is communicated with the sewage branch pipe, the water outlet end of the water inlet distribution well chamber is respectively communicated with the intercepting well chamber and the duckbill valve well chamber, an intercepting pipe is arranged between the intercepting well chamber and the intercepting valve well chamber, an intercepting water outlet pipe is arranged in the intercepting valve well chamber, the intercepting pipe is communicated with the intercepting water outlet pipe, a duckbill valve is arranged between the water inlet distribution well chamber and the duckbill valve well chamber, the water outlet end of the duckbill valve faces the duckbill valve well chamber, and the water outlet end of the duckbill valve well chamber is connected with an overflow water outlet pipe; the water outlet end of the intercepting water outlet pipe is communicated with the sewage main pipe, and the sewage main pipe is used for being communicated with a sewage treatment plant; the water outlet end of the overflow water outlet pipe is communicated with the main rainwater pipe, and the main rainwater pipe is used for being communicated with a natural water body.

By adopting the technical scheme, in sunny days, domestic sewage enters the sewage pipeline, flows into the intercepting well structure through the sewage pipeline, then sequentially passes through the inflow distribution well chamber, the intercepting well chamber and the intercepting valve well chamber, flows to the sewage header pipe, and finally flows into the sewage treatment plant for treatment; during rainy days, rainwater flows into the rainwater branch pipe after being treated through the rainwater infiltration structure, the flow direction of domestic sewage and initial rainwater is consistent with the flow direction during sunny days, and after the rainfall is increased, most rainwater directly flows into the duckbill valve well chamber through the duckbill valve, and finally flows into the natural water body through the overflow outlet pipe and the rainwater header pipe. According to the scheme, no power source is adopted, the rainwater and sewage are distributed and discharged by utilizing the unpowered structure, the drainage capacity of the urban drainage system is improved, the treatment load of a sewage treatment plant in rainy days is effectively relieved, meanwhile, the pollution to natural water is reduced, and energy conservation and environmental protection are realized.

Optionally, a swirl valve is arranged between the shutoff pipe and the shutoff water outlet pipe, and the shutoff pipe is communicated with the shutoff water outlet pipe through the swirl valve.

By adopting the technical scheme, the interior of the valve body of the swirl valve is of a hollow structure, no mechanical part is arranged, no additional kinetic energy is required in use, the swirl valve completely runs automatically according to the hydraulics and aeromechanics principles, no external force operation and control such as electric power or manpower is required, the operation is safe, and the swirl valve not only controls the flow, but also plays the roles of intercepting sewage and stabilizing flow.

Optionally, an emergency discharge pipe is arranged between the intercepting well chamber and the intercepting valve well chamber, one end of the emergency discharge pipe is communicated with the intercepting well chamber, one end, far away from the intercepting well chamber, of the emergency discharge pipe is communicated with the side wall of the intercepting water outlet pipe, and the depth of the emergency discharge pipe is smaller than that of the intercepting pipe.

Through adopting above-mentioned technical scheme, when the water level in the vatch basin structure rises, the rainwater and the sewage of mixed flow can be followed emergent delivery pipe and flowed through the outlet pipe that dams, finally flow to in the sewage treatment plant. The provision of an emergency drain further improves the drainage capacity of the drainage system.

Optionally, the depth of the communication position of the inflow distribution well chamber and the intercepting well chamber is greater than the depth of the communication position of the inflow distribution well chamber and the duckbill valve well chamber.

Through adopting above-mentioned technical scheme, such setting up makes drainage system when the normality, and sewage direct flow to sewage treatment plant, when the heavy rain weather appears, rain sewage can flow to duckbill valve well room through the duckbill valve, and the final natural water that flows to guarantees to the reposition of redundant personnel of rain sewage and discharges.

Optionally, the intercommunication department of intaking distribution well room and vatch basin room is provided with the soft grid net of damming, the intercommunication department of intaking distribution well room and duckbill valve well room is provided with duckbill valve protection grid.

Through adopting above-mentioned technical scheme, soft grid dams can filter rubbish and debris that exist in the sewage, and rubbish and debris after the filtration are stayed in the well chamber that dams to in the follow-up processing that handles, duckbilled valve protection grid then can play the effect of protection duckbilled valve, reduce the condition that debris appear blockking up the opening that duckbilled valve leads to the duckbilled valve and can not normally open and close, ensured the normal operating of duckbilled valve.

Optionally, rainwater infiltration structure includes the well body, well lid, filtering component and metalling, the well body is buried underground, the infiltration hole has been seted up to the bottom and the lateral wall of the well body, the top at the well body is installed to the well lid, the limbers has been seted up to the well lid, filtering component sets up and is used for filtering debris in the well body, the metalling is filled in the periphery of the well body, the lateral wall and the rainwater branch pipe of the well body are linked together.

Through adopting above-mentioned technical scheme, when raining, the rainwater flows into the well through the well lid in vivo, and filter assembly filters partly debris, and the initial stage rainwater then can flow to the rubble layer in through the infiltration hole, and the rubble layer can absorb and filter partly initial stage rainwater, has reduced sewage treatment plant's processing load to a certain extent, and after the rainwater increase, well body water level rises, and unnecessary rainwater then flows into in the rainwater spinal branch pipe, flows through subsequent processing. The scheme can timely permeate rainwater to the underground, reduce urban waterlogging, has the advantages of simple technology, convenient operation, low investment, obvious benefit and the like, and further improves the drainage capacity of the urban drainage system.

Optionally, filtering component includes the guide plate and cuts dirty basket, the guide plate is installed at two relative inside walls of the well body and is located the play water end of well lid, cut dirty basket and install the inside wall adjacent with the guide plate at the well body, the play water end orientation of guide plate cuts the end of intaking of dirty basket.

Through adopting above-mentioned technical scheme, the rainwater carries debris to get into the well internal, and under the effect of guide plate, rainwater and debris fall into and cut dirty basket in, cut dirty basket and filter the debris of rainwater, the rainwater then can be through cutting dirty basket flow direction shaft bottom. The arrangement of the sewage intercepting basket can effectively ensure the filtration of sundries in rainwater, so that the subsequent recovery of the sundries by workers is facilitated, and the treatment load of a sewage treatment plant is further reduced.

Optionally, a gap is formed between the sewage intercepting basket and the flow guide plate, and a gap is formed between the sewage intercepting basket and two inner side walls opposite to the well body.

Through adopting above-mentioned technical scheme, cut dirty basket and the inner wall of the well body and have the interval to when debris blockked up and cut dirty basket, the rainwater also can be through the top side overflow outflow of cutting dirty basket, thereby can effectively reduce the phenomenon that the well body blockked up to appear, guarantee the normal drainage of the well body.

Optionally, the periphery of the crushed stone layer is wrapped with geotextile.

Through adopting above-mentioned technical scheme, geotechnological cloth can play the effect of filtering and reinforcing infiltration, further improves rubble layer infiltration ability and stability.

Optionally, the top of the rubble layer is located the week side of well body and has seted up and gather water concave position.

Through adopting above-mentioned technical scheme, gather water concave position can be effectively, gather ponding, the rainwater on ground fast, improve the drainage effect to the rainwater.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the scheme does not adopt any power source, realizes the shunting discharge of rain sewage by utilizing the unpowered structure, improves the drainage capacity of the urban drainage system, effectively relieves the treatment load of a sewage treatment plant in rainy days, reduces the pollution to natural water, and realizes energy conservation and environmental protection;

2. the rainwater infiltration structure can infiltrate rainwater underground in time, reduce urban waterlogging, has the advantages of simple technology, convenient operation, low investment, obvious benefit and the like, and further improves the drainage capacity of an urban drainage system;

3. the water-collecting concave position can effectively and quickly collect accumulated water and rainwater on the ground, and the rainwater drainage effect is improved.

Drawings

FIG. 1 is a schematic view of a paving system according to an embodiment of the present application.

Fig. 2 is a front sectional view of a rainwater infiltration structure of an embodiment of the present application.

Fig. 3 is a side sectional view of a rainwater infiltration structure of an embodiment of the present application.

Fig. 4 is a top view of a vatch well structure according to an embodiment of the present application.

Description of reference numerals: 1. a rainwater infiltration structure; 11. a well body; 111. a penetration hole; 112. a support strip; 12. a well cover; 121. a water through hole; 13. a crushed stone layer; 131. water collecting concave positions; 14. a filter assembly; 141. a baffle; 142. a sewage intercepting basket; 15. geotextile; 2. a rainwater branch pipe; 3. a sewage branch pipe; 4. a vatch basin structure; 41. a water inlet distribution well chamber; 411. a flow interception port; 412. an overflow port; 42. a shut-off well chamber; 421. a soft grid mesh for interception; 43. a shut-off valve well chamber; 431. a shutoff pipe; 432. a swirl valve; 433. an emergency discharge pipe; 434. intercepting the water outlet pipe; 44. a duckbill valve well chamber; 441. a duckbill valve protection grid; 442. a duckbill valve; 443. an overflow water outlet pipe; 5. a main sewer; 51. a sewage treatment plant; 6. a main rainwater pipe.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses urban underground sewage pipeline laying system. Referring to fig. 1, the laying system comprises a rainwater penetration structure 1, rainwater branch pipes 2, sewage branch pipes 3, an intercepting well structure 4, a main sewage pipe 5 and a main rainwater pipe 6, wherein the rainwater penetration structure 1 is arranged at a rainwater port and used for guiding and filtering initial rainwater, the water outlet end of the rainwater penetration structure 1 is communicated with the water inlet end of the rainwater branch pipes 2, the water outlet ends of the rainwater branch pipes 2 are communicated with the sewage branch pipes 3, the intercepting well structure 4 is arranged on the sewage branch pipes 3 and used for shunting and discharging rainwater and sewage, the intercepting water outlet end of the intercepting well structure 4 is communicated with the main sewage pipe 5, the overflowing water outlet end of the intercepting well structure 4 is communicated with the main rainwater pipe 6, the water outlet end of the main sewage pipe 5 is communicated with a sewage treatment plant 51, and the water outlet end of the.

Referring to fig. 2 and 3, rainwater infiltration structure 1 includes the well body 11, well lid 12, rubble layer 13 and filtering component 14, the well body 11 is buried underground, a plurality of infiltration holes 111 have all been seted up to the bottom and the lateral wall of the well body 11, the lateral wall of the well body 11 is linked together with rainwater branch pipe 2, the well body 11 is greater than the distance in infiltration hole 111 and shaft bottom with the distance in rainwater branch pipe 2 intercommunication department and shaft bottom, well lid 12 installs the top at the well body 11, a plurality of limbers 121 have been seted up on well lid 12, a plurality of limbers 121 are the array and arrange.

Wherein, the rubble layer 13 is filled in the periphery of well body 11, and rubble layer 13 mainly comprises the gradation rubble, and geotechnological cloth 15 has still been wrapped up in the periphery of rubble layer 13, and the top of rubble layer 13 is located the week side of well body 11 and has seted up water-collecting concave position 131, and the peak of well lid 12 is not higher than water-collecting concave position 131, and filter assembly 14 sets up and is used for filtering debris in well body 11.

When raining, the water collecting concave part 131 can quickly collect rainwater and effectively block silt and fine impurities carried in the rainwater, the collected rainwater flows into the well body 11 through the water through hole 121 of the well cover 12 and then flows through the filtering component 14, the filtering component 14 filters out a part of impurities in the rainwater, the rainwater filtered by the filtering component 14 falls into the bottom of the well body 11, then a part of rainwater permeates into the gravel layer 13 through the permeation hole 111, and the gravel layer 13 and the geotextile 15 absorb and filter part of initial rainwater to supplement underground water; when the rainfall increases, the water level of the well body 11 rises, and redundant rainwater flows into the rainwater branch pipe 2 to be subjected to subsequent drainage treatment.

Referring to fig. 2 and 3, the filtering assembly 14 includes a guide plate 141 and a dirt blocking basket 142, the guide plate 141 is installed on two opposite inner side walls of the well body 11, the guide plate 141 is located below the well lid 12, the two guide plates 141 are arranged obliquely downward, a water outlet end of the guide plate 141 faces a water inlet end of the dirt blocking basket 142, two adjacent inner side walls of the installation position of the guide plate 141 of the well body 11 are provided with the bearing strips 112, the two bearing strips 112 are arranged in parallel along a horizontal direction, a top edge of the dirt blocking basket 142 is supported on a top surface of the bearing strips 112, two outer side walls of the dirt blocking basket 142 are spaced from two inner side walls of the installation guide plate 141 of the well body 11, and a top side edge of the dirt blocking basket 142 is spaced from a bottom.

Rainwater carries sundries to flow into the well body 11, the rainwater and the sundries fall into the dirt intercepting basket 142 under the flow guiding action of the flow guiding plate 141, the sundries are intercepted in the dirt intercepting basket 142, and the rainwater flows to the bottom of the well through the dirt intercepting basket 142. Meanwhile, the dirt intercepting basket 142 is spaced from the inner wall of the well body 11, so that when sundries block the dirt intercepting basket 142, rainwater can overflow out of the top side of the dirt intercepting basket 142, the phenomenon that the dirt intercepting basket 142 blocks the well body 11 can be effectively reduced, normal drainage of the well body 11 is guaranteed, and the practicability of the well body 11 is improved. The well body 11, the well lid 12, the guide plate 141 and the sewage intercepting basket 142 are all made of PE materials, so that the cost can be effectively reduced, and the service life of the sewage intercepting basket can be prolonged.

Referring to fig. 1 and 4, the intercepting well structure 4 includes a water inlet distribution well chamber 41, an intercepting well chamber 42, an intercepting valve well chamber 43 and a duckbill valve well chamber 44, a water inlet end of the water inlet distribution well chamber 41 is communicated with the sewage branch pipe 3, a water outlet end of the water inlet distribution well chamber 41 is respectively communicated with the intercepting well chamber 42 and the duckbill valve well chamber 44, an intercepting port 411 is arranged at a communication position of the water inlet distribution well chamber 41 and the intercepting well chamber 42, an overflow port 412 is arranged at a communication position of the water inlet distribution well chamber 41 and the duckbill valve well chamber 44, the depth of the intercepting port 411 is larger than that of the overflow port 412, an intercepting soft grid net 421 is installed at the intercepting port 411, and the intercepting soft grid net 421 can extend into the intercepting well chamber 42. When sewage flows through the interception soft grid net 421, the interception soft grid net 421 intercepts sundries and garbage in the sewage, and the intercepted sundries and garbage can be temporarily left in the interception well chamber 42, so that subsequent collection and treatment are facilitated.

An intercepting pipe 431 is arranged between the intercepting well chamber 42 and the intercepting valve well chamber 43, one end of the intercepting pipe 431 is communicated with the intercepting well chamber 42, a rotary valve 432 is installed in the intercepting valve well chamber 43, one end, far away from the intercepting well chamber 42, of the intercepting pipe 431 is connected into the rotary valve 432 in the direction of a tangent angle, the water outlet end of the rotary valve 432 is connected with an intercepting water outlet pipe 434, the intercepting water outlet pipe 434 is installed in the intercepting valve well chamber 43, and the water outlet end of the intercepting water outlet pipe 434 is communicated with the sewage main pipe 5.

In addition, an emergency discharge pipe 433 is further installed between the intercepting well chamber 42 and the intercepting valve well chamber 43, one end of the emergency discharge pipe 433 is communicated with the intercepting well chamber 42, one end of the emergency discharge pipe 433, which is far away from the intercepting well chamber 42, is communicated with the side wall of the intercepting water pipe 434, and the installation depth of the emergency discharge pipe 433 is smaller than that of the intercepting pipe 431.

In sunny days, domestic sewage flows into the water inlet distribution well chamber 41 through the sewage branch pipe 3, then flows into the intercepting well chamber 42, sequentially flows through the intercepting pipe 431, the swirl valve 432 and the intercepting water outlet pipe 434, and finally flows to the main sewage discharge pipe 5 and the sewage treatment plant 51, when the sewage amount is large, the water level of the intercepting well chamber 42 rises, the sewage is discharged into the intercepting water outlet pipe 434 through the emergency discharge pipe 433, and finally flows to the main sewage discharge pipe 5 and the sewage treatment plant 51, and the arrangement of the emergency discharge pipe 433 further improves the treatment load capacity of the intercepting well structure 4.

Meanwhile, a duckbill valve protection grid 441 and a duckbill valve 442 are arranged at the overflow port 412, the duckbill valve protection grid 441 is located at the water inlet end of the duckbill valve 442, the duckbill valve 442 is communicated with the water inlet distribution well chamber 41 and the duckbill valve well chamber 44, the water outlet end of the duckbill valve 442 faces the duckbill valve well chamber 44, the water outlet end of the duckbill valve well chamber 44 is connected with an overflow outlet pipe 443, the overflow outlet pipe 443 is arranged opposite to the duckbill valve 442, and the water outlet end of the overflow outlet pipe 443 is communicated with the rainwater main pipe 6.

During rainy days, the water level of the water inlet distribution well chamber 41 rises, and under the action of water pressure, the duckbill valve 442 is opened, and a part of rainwater flows to the duckbill valve well chamber 44 through the duckbill valve 442, then flows through the overflow outlet pipe 443 and the rainwater header pipe 6 in sequence, finally flows to a natural water body, and the rainwater and the sewage are shunted and discharged during rainy days. Meanwhile, the duckbill valve 442 can reduce the occurrence of backflow phenomenon, ensure the normal operation of the urban drainage system,

the implementation principle of the urban underground sewage pipeline laying system in the embodiment of the application is as follows: in sunny days, domestic sewage enters the sewage branch pipe 3, flows into the intercepting well structure 4 through the sewage branch pipe 3, then sequentially flows through the water inlet distribution well chamber 41, the intercepting well chamber 42 and the intercepting valve well chamber 43, flows to the sewage drainage header pipe 5, and finally flows into the sewage treatment plant 51, and sewage in the sewage treatment plant 51 is treated;

in rainy days, rainwater flows into the well body 11 through the well cover 12 in the initial stage of rain, the sewage intercepting basket 142 filters part of impurities in the rainwater, the filtered part of the rainwater permeates into the gravel layer 13 through the permeation holes 111, and the initial stage rainwater is filtered and absorbed by using the underground water absorption capacity, so that the supplement of underground water is completed, and the treatment load of the sewage treatment plant 51 is reduced;

after the rainfall increase, the well body 11 water level rises, the rainwater flows into in rainwater branch pipe 2, rethread rainwater branch pipe 2 inward-remittance sewage branch pipe 3, rainwater in sewage branch pipe 3 flows into in intaking distribution well room 41, the water level of intaking distribution well room 41 rises, duckbill valve 442 is opened under the water pressure effect, the rainwater flows into duckbill valve well room 44 through duckbill valve 442 in, finally converge into the natural water through overflow outlet pipe 443 and rainwater house steward 6, thereby realize the reposition of redundant personnel of rainwater and discharge.

According to the scheme, no power source is adopted, the rainwater and sewage shunting discharge is realized by utilizing the unpowered structure, the energy consumption is reduced, the drainage capacity of a municipal drainage system is improved, the treatment load of the sewage treatment plant 51 in rainy days is effectively relieved, meanwhile, the pollution to natural water is reduced, and the energy conservation and environmental protection are realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An urban underground sewage conduit laying system, comprising:

the rainwater collecting device comprises sewage branch pipes (3) and rainwater branch pipes (2), wherein a plurality of rainwater branch pipes (2) are communicated with the sewage branch pipes (3);

the rainwater infiltration structure (1) is arranged at the rainwater outlet, the water outlet end of the rainwater infiltration structure (1) is communicated with the rainwater branch pipe (2), and the rainwater infiltration structure (1) is used for filtering part of initial rainwater and guiding the flow;

locate vatch basin structure (4) on sewage branch pipe (3), vatch basin structure (4) are including intaking distribution well room (41), vatch basin room (42), shutoff valve well room (43) and duckbilled valve well room (44), the end of intaking distribution well room (41) is linked together with sewage branch pipe (3), the end of the play of intaking distribution well room (41) communicates with vatch basin room (42) and duckbilled valve well room (44) respectively, be provided with between shutoff well room (42) and shutoff valve well room (43) shutoff pipe (431), be provided with in the shutoff valve well room (43) shutoff outlet pipe (434), shutoff pipe (431) are linked together with outlet pipe (434), it is provided with duckbilled valve (442) between distribution well room (41) and duckbilled valve well room (44) to intake, the end of duckbilled valve (442) is towards duckbilled valve well room (44), the water outlet end of the duckbill valve well chamber (44) is connected with an overflow water outlet pipe (443);

the water outlet end of the intercepting water outlet pipe (434) is communicated with the main sewage discharge pipe (5), and the main sewage discharge pipe (5) is used for being communicated with a sewage treatment plant (51);

the water outlet end of the overflow water outlet pipe (443) is communicated with the main rainwater pipe (6), and the main rainwater pipe (6) is used for being communicated with a natural water body.

2. The municipal underground sewage piping system according to claim 1, wherein: a rotary valve (432) is arranged between the intercepting pipe (431) and the intercepting water outlet pipe (434), and the intercepting pipe (431) and the intercepting water outlet pipe (434) are communicated through the rotary valve (432).

3. The municipal underground sewage piping system according to claim 2, wherein: be provided with emergent discharge pipe (433) between vatch basin room (42) and vatch basin valve well room (43), the one end and vatch basin room (42) intercommunication of emergent discharge pipe (433), the one end that vatch basin room (42) were kept away from in emergent discharge pipe (433) is linked together with the lateral wall of damming outlet pipe (434), the degree of depth of emergent discharge pipe (433) is less than the degree of depth of damming pipe (431).

4. The municipal underground sewage piping system according to claim 3, wherein: the depth of the communication part of the water inlet distribution well chamber (41) and the intercepting well chamber (42) is greater than that of the communication part of the water inlet distribution well chamber (41) and the duckbill valve well chamber (44).

5. The municipal underground sewage piping system according to claim 4, wherein: the soft grid net (421) that dams is arranged at the communication position of the water inlet distribution well chamber (41) and the intercepting well chamber (42), and the duckbill valve protection grid (441) is arranged at the communication position of the water inlet distribution well chamber (41) and the duckbill valve well chamber (44).

6. The municipal underground sewage piping system according to claim 1, wherein: rainwater infiltration structure (1) includes the well body (11), well lid (12), filtering component (14) and metalling (13), the well body (11) is buried underground, infiltration hole (111) have been seted up to the bottom and the lateral wall of the well body (11), the top at the well body (11) is installed in well lid (12), limbers (121) have been seted up in well lid (12), filtering component (14) set up and are used for filtering debris in the well body (11), the periphery at the well body (11) is filled in metalling (13), the lateral wall and rainwater branch pipe (2) of the well body (11) are linked together.

7. The municipal underground sewage piping system according to claim 6, wherein: the filter assembly (14) comprises a guide plate (141) and a sewage intercepting basket (142), the guide plate (141) is arranged on two opposite inner side walls of the well body (11) and located at the water outlet end of the well cover (12), the sewage intercepting basket (142) is arranged on the inner side walls of the well body (11) adjacent to the guide plate (141), and the water outlet end of the guide plate (141) faces the water inlet end of the sewage intercepting basket (142).

8. The municipal underground sewage piping system according to claim 7, wherein: the sewage interception basket (142) is spaced from the guide plate (141), and the sewage interception basket (142) is spaced from two inner side walls opposite to the well body (11).

9. The municipal underground sewage piping system according to claim 6, wherein: the periphery of the gravel layer (13) is wrapped with geotextile (15).

10. The municipal underground sewage piping system according to claim 6, wherein: the top of the gravel layer (13) is provided with a water-collecting concave position (131) on the periphery of the well body (11).