A municipal pipe trench structure of a drainage channel and a construction process thereof

Abstract

The application discloses a municipal pipeline trench structure of a drainage channel and a construction process thereof, and relates to the technical field of municipal engineering construction. The municipal pipeline trench structure of the drainage channel comprises a trench body and a drainage channel body. The bottom of the trench body is respectively provided with a pipeline installation area and a drainage area. A water collecting tank is arranged in the drainage area. A drainage auxiliary pipe, a flow guide blind pipe and a water permeable soil retaining structure are arranged in the water collecting tank. A vertical blocking component is arranged between the pipeline installation area and the drainage area, and is used for preventing water in the water collecting tank from penetrating into the pipeline installation area. The water collecting tank, the drainage auxiliary pipe and the flow guide blind pipe are arranged, underground seepage water can be effectively collected and discharged, the problem that a temporary trench is damaged or blocked is avoided, and the problem that a traditional drainage mode is difficult to continuously and stably drain water is solved.

Description

Technical Field

[0001] This application relates to the technical field of municipal engineering construction, and in particular to a municipal pipeline trench structure for drainage channels and its construction process. Background Technology

[0002] In the field of municipal drainage pipeline construction, with the continuous advancement of urban construction, the requirements for drainage systems are increasing. A reasonable drainage pipeline trench structure is crucial for ensuring the normal operation of the drainage system and maintaining the stability of urban infrastructure. A good trench structure can effectively cope with various complex geological conditions and environmental factors, ensuring the long-term stable use of drainage pipelines, reducing urban flooding caused by pipeline damage or poor drainage, and is of great significance to the sustainable development of cities.

[0003] However, when the groundwater level is high in the construction area or during the rainy season, water seepage may occur on the sidewalls and bottom of the trench. In the past, to solve the problem of groundwater seepage during the construction of municipal drainage pipeline trenches, temporary sump pits and drainage ditches were usually dug at the bottom of the trench, and then water was pumped out. However, the temporary sump pits and drainage ditches are easily damaged or blocked during construction, making it difficult to play a continuous and stable drainage role; moreover, seepage may wet and soften the soil layer used for the pipeline foundation, leading to a decrease in the bearing capacity of the foundation, which in turn affects the backfill compaction degree and threatens the stability of the entire drainage pipeline system; in addition, continuous pumping operations may carry away fine soil particles, causing foundation disturbance and increasing the risk of uneven settlement and other problems in the pipeline later. Summary of the Invention

[0004] To address the problems existing in the prior art, this application provides a municipal pipeline trench structure for drainage channels and its construction process.

[0005] Firstly, the municipal pipeline trench structure for drainage channels provided in this application adopts the following technical solution: A municipal pipeline trench structure for drainage channels includes a trench body and a drainage channel body. The bottom of the trench body is provided with: a pipeline installation area for installing the drainage channel body; a drainage area located on one side of the pipeline installation area; a water collection trough located within the drainage area and extending along the trench body, for collecting groundwater seepage; a secondary drainage pipe laid within the water collection trough, the sidewall of which is connected to several blind guide pipes, each of which is vertically arranged; a permeable retaining structure located within the water collection trough to prevent sand from entering the blind guide pipes; and a vertical barrier component located between the pipeline installation area and the drainage area to prevent water from the water collection trough from seeping into the pipeline installation area.

[0006] Optionally, the permeable retaining structure includes permeable geotextile laid on the bottom and two sides of the water collection trough, and a rigid permeable aggregate layer filled inside the water collection trough. The drainage secondary pipe is laid at the bottom of the rigid permeable aggregate layer, and the top of the diversion blind pipe is located inside the rigid permeable aggregate layer.

[0007] Optionally, a load-bearing cover plate is provided in the drainage area and on top of the water collection tank.

[0008] Optionally, the vertical barrier component includes a plurality of water-stop steel sheet piles arranged sequentially along the extension direction of the trench body, and a rubber waterstop strip is also provided between adjacent water-stop steel sheet piles.

[0009] Optionally, splicing grooves are provided on both sides of the water-stop steel sheet pile, and adjacent water-stop steel sheet piles are spliced ​​together through the splicing grooves.

[0010] Optionally, the bottom end of the water-stop sheet pile extends at least 0.5m below the bottom surface of the water collection tank, and the top end of the water-stop sheet pile extends at least 0.3m above the bottom surface of the pipeline installation area.

[0011] Optionally, a foundation sand and gravel layer is laid at the bottom of the pipeline installation area, and the top surface of the foundation sand and gravel layer is flush with or lower than the top of the water-stop steel sheet pile. The drainage channel body is installed above the foundation sand and gravel layer. A sand and gravel stabilizing layer is also laid inside the trench body and above the foundation sand and gravel layer. The bottom of the drainage channel body is buried in the sand and gravel stabilizing layer, and the compaction coefficient of the sand and gravel stabilizing layer is not less than the compaction coefficient of the foundation sand and gravel layer.

[0012] Optionally, a first backfill layer is provided within the trench body and on both sides of the drainage channel body, a second backfill layer is provided at the top of the drainage channel body and between the first backfill layers on both sides, and a third backfill layer is also provided within the trench body and above the first and second backfill layers; the compaction coefficient of the first backfill layer is greater than that of the second backfill layer.

[0013] Optionally, the sidewalls on both sides of the trench body are inclined and gradually approach each other along the direction close to the bottom wall of the trench body.

[0014] Secondly, this application provides a construction process for a municipal pipeline trench structure for drainage channels, employing the following technical solution: A construction process for a municipal pipeline trench structure for drainage channels includes the following steps: Step S1: Excavate the trench body and gradually bring the sidewalls of both sides of the trench body closer together in the direction of the bottom wall of the trench body. At the same time, divide the bottom of the trench body into a pipe installation area and a drainage area. Step S2: At the interface between the pipeline installation area and the drainage area, water-stop steel sheet piles are driven in sequence along the extension direction of the trench body, and rubber water-stop strips are embedded in the splicing grooves of adjacent water-stop steel sheet piles to form a vertical barrier component. Step S3: Excavate a water collection trough in the drainage area and lay permeable geotextile on the bottom and both sides of the water collection trough. Step S4: Lay a secondary drainage pipe at the bottom of the water collection tank and vertically connect several blind guide pipes. Then fill the water collection tank with rigid permeable aggregate to form a rigid permeable aggregate layer. The top of the blind guide pipes is buried in the rigid permeable aggregate layer. Install a load-bearing cover plate above the water collection tank at the top of the drainage area. Step S5: Lay a base sand and gravel layer at the bottom of the pipeline installation area and level it so that its top surface is flush with or slightly lower than the top of the water-stop steel sheet pile, and compact the base sand and gravel layer. Step S6: Install the drainage channel body above the foundation sand and gravel layer, lay a sand and gravel stabilizing layer in the trench body, bury the bottom of the drainage channel body in the sand and gravel stabilizing layer, and compact the sand and gravel stabilizing layer, and the compaction coefficient shall not be less than the compaction coefficient of the foundation sand and gravel layer. Step S7: Perform layered backfilling. First, backfill the first backfill soil layer with a larger compaction coefficient on both sides of the drainage channel body. Then, backfill the second backfill soil layer with a smaller compaction coefficient on the top of the drainage channel body. Finally, cover with the third backfill soil layer to complete the trench construction.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application, by setting up a water collection trough, drainage secondary pipe, and diversion blind pipe, can effectively collect and discharge underground seepage water, avoiding the problem of temporary channel damage or blockage, and solving the problem of traditional drainage methods' inability to provide continuous and stable drainage. Specifically, by setting up independent drainage areas and pipe installation areas, and using vertical barrier components to physically isolate the two, it can prevent water from the water collection trough from seeping into the pipe installation area, ensuring a dry and stable installation environment for the drainage channel itself. The water collection trough, together with the drainage secondary pipe and diversion blind pipe, forms a three-dimensional active drainage network that can continuously and stably collect and discharge underground seepage water, avoiding water accumulation that soaks the pipe foundation. The permeable retaining structure effectively blocks sand from entering the diversion system, preventing piping and foundation disturbance caused by continuous pumping carrying away fine soil particles, ensuring the integrity of the original soil in the pipe installation area, and significantly reducing the risk of uneven settlement in the later stage.

[0016] 2. This application utilizes permeable geotextile as a flexible filter layer. Its equivalent pore size design effectively prevents soil particle loss while allowing water to flow smoothly. The rigid permeable aggregate layer not only provides highly permeable drainage channels but also serves a supporting role due to its rigidity. This combination of "textile + stone" ensures that the drainage system does not become clogged or collapse during long-term operation, achieving "drainage without soil discharge" and completely eliminating the potential for foundation erosion caused by soil loss.

[0017] 3. This application utilizes continuous sheet piles combined with rubber waterstops to form a virtually impermeable vertical partition wall. The bottom of the sheet piles extends 0.5m below the bottom of the sump, effectively cutting off the lateral recharge path of deep groundwater and preventing water from seeping into the pipeline installation area from the bottom. Simultaneously, the top of the sheet piles extends at least 0.3m above the bottom of the pipeline installation area, preventing sand and soil within the pipeline installation area from flowing into the drainage area with the groundwater, thus ensuring the stability of the soil structure within the pipeline installation area. This combination ensures that the pipeline installation area remains in a relatively dry and stable environment, protecting the foundation bearing capacity and backfill compaction from water damage.

[0018] 4. This application provides strong lateral passive earth pressure by setting a first backfill layer with higher compaction on both sides of the drainage channel body, restricting the horizontal displacement of the pipeline and preventing it from rolling or shifting; a second backfill layer with lower compaction is set on top of the drainage channel body as a buffer layer, reducing the impact force of the upper load directly transmitted to the top of the pipeline and preventing the pipeline from rupturing due to excessive vertical earth pressure. This differentiated backfilling strategy significantly improves the seismic performance and deformation resistance of the pipeline system and extends its service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the structure of the water collection tank according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the structure of the vertical barrier component in an embodiment of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Trench body; 11. Pipeline installation area; 12. Drainage area; 13. Load-bearing cover plate; 14. Foundation sand and gravel layer; 15. Sand and gravel stabilization layer; 16. First backfill layer; 17. Second backfill layer; 18. Third backfill layer; 2. Drainage channel body; 3. Water collection trough; 31. Permeable geotextile; 32. Rigid permeable aggregate layer; 4. Drainage secondary pipe; 41. Drainage guide blind pipe; 5. Vertical barrier component; 51. Water-stop steel sheet pile; 511. Splicing groove; 52. Rubber waterstop. Detailed Implementation

[0021] The following will be combined with the appendix Figure 1 -Appendix Figure 3 The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0022] This application mainly adopts the setting of drainage zones and pipeline installation zones and special drainage structures to effectively collect and discharge seepage water and ensure the stability of the pipeline installation environment. The following is a further detailed description of this application.

[0023] This application discloses a municipal pipeline trench structure for drainage channels. (Refer to...) Figure 1 and Figure 2 The system includes a trench body 1, a drainage channel body 2, a pipe installation area 11, a drainage area 12, a water collection trough 3, a secondary drainage pipe 4, a permeable retaining structure, and a vertical barrier component 5. The pipe installation area 11 is used to install the drainage channel body 2. The drainage area 12 is located on one side of the pipe installation area 11. The water collection trough 3 is located within the drainage area 12 and extends along the trench body 1, used to collect groundwater seepage. The secondary drainage pipe 4 is laid within the water collection trough 3, and its sidewalls are connected to several vertically arranged blind guide pipes 41. The permeable retaining structure is located within the water collection trough 3 to prevent sand from entering the blind guide pipes 41. The vertical barrier component 5 is located between the pipe installation area 11 and the drainage area 12 to prevent water from the water collection trough 3 from seeping into the pipe installation area 11. This structural design effectively collects and drains groundwater seepage, avoiding damage or blockage of the temporary trench, while preventing water from the water collection trough 3 from seeping into the pipe installation area 11, ensuring a dry and stable installation environment for the drainage channel body 2. The water collection trough 3, together with the drainage secondary pipe 4 and the diversion blind pipe 41, forms a three-dimensional active drainage network that can continuously and stably collect and discharge groundwater seepage, preventing water accumulation from soaking the pipe foundation. The permeable retaining structure effectively blocks sand from entering the diversion system, preventing piping and foundation disturbance caused by continuous pumping carrying away fine soil particles, ensuring the integrity of the original soil in the pipe installation area 11, and significantly reducing the risk of uneven settlement in the later stage.

[0024] Reference Figure 1 Specifically, the sidewalls on both sides of the trench body 1 are inclined and gradually move closer to the bottom wall of the trench body 1. This inclined sidewall design can increase the stability of the trench, reduce the risk of sidewall collapse, and improve the overall safety of the trench during construction and operation.

[0025] Reference Figure 2Specifically, the permeable retaining structure includes a permeable geotextile 31 and a rigid permeable aggregate layer 32. The permeable geotextile 31 is laid on the bottom and both sides of the water collection trough 3. It is a flexible filter layer, generally made of materials such as polyester fiber, and has good permeability and corrosion resistance. In practical applications, geotextiles made of materials such as polypropylene can also be used as substitutes. The equivalent pore size design of the permeable geotextile 31 effectively prevents soil particle loss while allowing water to flow smoothly. The rigid permeable aggregate layer 32 fills the interior of the water collection trough 3. The drainage secondary pipe 4 is laid at the bottom of the rigid permeable aggregate layer 32, and the top of the guide blind pipe 41 is located inside the rigid permeable aggregate layer 32. The rigid permeable aggregate layer 32 can be made of materials such as crushed stone and gravel. These materials not only provide highly permeable drainage channels but also provide support due to their rigidity. This combination of "cloth and stone" ensures that the drainage system does not become clogged or collapse during long-term operation, achieving "drainage without soil discharge" and completely eliminating the hidden danger of foundation hollowing caused by soil loss.

[0026] Reference Figure 2 Specifically, a load-bearing cover plate 13 is installed within the drainage area 12 and on top of the water collection tank 3. The load-bearing cover plate 13 is generally made of reinforced concrete or stainless steel, possessing strong load-bearing capacity to withstand loads from vehicles and equipment during construction, protecting the drainage structure within the water collection tank 3 from damage. In cases where load-bearing requirements are not high, plastic covers or similar materials can be used as alternatives.

[0027] Reference Figure 2 and Figure 3 Specifically, the vertical barrier component 5 includes several sheet piles 51 arranged sequentially along the extension direction of the trench body 1, with rubber waterstops 52 installed between adjacent sheet piles 51. Each sheet pile 51 has a splicing groove 511 on both sides, allowing adjacent sheet piles 51 to be joined together via these grooves. This splicing method ensures a tight connection between the sheet piles 51, enhancing the barrier effect. The sheet piles 51 are generally made of hot-rolled steel plates, possessing good strength and water-stopping performance. The rubber waterstops 52 are made of natural or synthetic rubber, exhibiting good elasticity and sealing performance, effectively preventing water leakage from the joints of the sheet piles 51.

[0028] Reference Figure 2Specifically, the bottom end of the water-stop sheet pile 51 extends at least 0.5m below the bottom surface of the water collection trough 3, and the top end extends at least 0.3m above the bottom surface of the pipeline installation area 11. This arrangement effectively cuts off the lateral recharge path of deep groundwater, preventing water from seeping into the pipeline installation area 11 from the bottom. Simultaneously, the top end of the sheet pile extending above the bottom surface of the pipeline installation area 11 prevents sand and soil within the pipeline installation area 11 from flowing into the drainage area 12 along with the groundwater, ensuring the stability of the soil structure within the pipeline installation area 11. This combination ensures that the pipeline installation area 11 remains in a relatively dry and stable environment, protecting the foundation bearing capacity and backfill compaction from water damage.

[0029] In addition to the combination of water-stop sheet piles 51 and rubber waterstops 52, the vertical barrier component 5 can also use a diaphragm wall as an alternative. Diaphragm walls are generally made of reinforced concrete, possessing high strength and water-stopping performance, effectively preventing groundwater infiltration. While the construction process of diaphragm walls is relatively complex, requiring specialized equipment and techniques, its barrier effect is more reliable, making it suitable for projects with high waterproofing requirements.

[0030] Reference Figure 1 and Figure 2 Specifically, a base sand and gravel layer 14 is laid at the bottom of the pipeline installation area 11, and the top surface of the base sand and gravel layer 14 is flush with or lower than the top of the water-stop steel sheet pile 51. The drainage channel body 2 is installed above the base sand and gravel layer 14. The base sand and gravel layer 14 is generally made of well-graded sand and gravel material, which, after compaction, can provide stable support for the drainage channel body 2. A sand and gravel stabilizing layer 15 is also laid inside the trench body 1 and above the base sand and gravel layer 14. The bottom of the drainage channel body 2 is buried in the sand and gravel stabilizing layer 15. The sand and gravel stabilizing layer 15 can provide a hard and uniform support surface for the pipeline, prevent stress concentration caused by local uneven hardness, and enhance the stability of the drainage channel body 2. The compaction coefficient of the sand and gravel stabilization layer 15 is not less than the compaction coefficient of the foundation sand and gravel layer 14. Typically, the compaction coefficient of the foundation sand and gravel layer 14 is between 0.85 and 0.9, and the compaction coefficient of the sand and gravel stabilization layer 15 is not less than 0.93.

[0031] Reference Figure 1Specifically, a first backfill layer 16 is provided inside the trench body 1 and on both sides of the drainage channel body 2. A second backfill layer 17 is provided at the top of the drainage channel body 2 and between the first backfill layers 16 on both sides. A third backfill layer 18 is also provided inside the trench body 1 and above the first backfill layers 16 and the second backfill layers 17. The compaction coefficient of the first backfill layer 16 is greater than that of the second backfill layer 17. Typically, the compaction coefficient of the first backfill layer 16 is not less than 0.9, and the compaction coefficient of the second backfill layer 17 is 0.85-0.9. The first backfill layer 16 with higher compaction on both sides of the drainage channel body 2 can provide strong lateral passive earth pressure, restricting the horizontal displacement of the pipeline and preventing the pipeline from rolling or deviating. The second backfill layer 17 with lower compaction at the top of the drainage channel body 2 serves as a buffer layer, reducing the impact force of the upper load directly transmitted to the top of the pipeline and preventing the pipeline from rupturing due to excessive vertical earth pressure. This differentiated backfilling strategy significantly improves the seismic performance and deformation resistance of the pipeline system, extending its service life.

[0032] The implementation principle of a municipal pipeline trench structure for drainage channels in this embodiment is as follows: This embodiment sets up an independent drainage area 12 and a pipeline installation area 11, and uses a vertical barrier component 5 to physically isolate the two, preventing water from the collection tank 3 from seeping into the pipeline installation area 11, thus ensuring a dry and stable installation environment for the drainage channel body 2. The three-dimensional active drainage network formed by the collection tank 3, drainage secondary pipe 4, and diversion blind pipe 41 can continuously and stably collect and discharge groundwater seepage, preventing water accumulation from soaking the pipeline foundation. The permeable retaining structure effectively blocks sand from entering the diversion system, preventing foundation disturbance, ensuring the integrity of the original soil in the pipeline installation area 11, and reducing the risk of uneven settlement in the later stage. At the same time, the differentiated backfilling strategy improves the seismic performance and deformation resistance of the pipeline system and extends its service life. Compared with the traditional drainage pipeline trench structure, this structural design has significant improvements in drainage effect, stability, and durability, solving problems such as poor drainage and unstable foundation in the prior art, and is of great significance to the construction and maintenance of urban drainage systems.

[0033] This application also discloses a construction process for a municipal pipeline trench structure for drainage channels, including the following steps: S1. Excavate the trench body 1, gradually bringing the sidewalls of the trench body 1 closer together towards the bottom wall. Simultaneously, divide the bottom of the trench body 1 into a pipe installation area 11 and a drainage area 12. During excavation, excavators and other equipment are required, and excavation must be carried out according to design requirements. Care must be taken to control the depth and slope of the trench during excavation to ensure its stability. At the same time, the excavated soil must be properly stockpiled to avoid affecting subsequent construction.

[0034] S2, at the interface between the pipeline installation area 11 and the drainage area 12, water-stop sheet piles 51 are driven sequentially along the extension direction of the trench body 1, and rubber waterstop strips 52 are embedded in the splicing grooves 511 of adjacent water-stop sheet piles 51 to form a vertical barrier component 5. During pile driving, equipment such as pile drivers should be used to ensure the verticality and driving depth of the water-stop sheet piles 51. When embedding the rubber waterstop strips 52, ensure they are firmly installed to prevent leakage.

[0035] S3. Excavate a water collection trench 3 within drainage zone 12, and lay permeable geotextile 31 on the bottom and both sides of the water collection trench 3. When excavating the water collection trench 3, control its size and depth to ensure it can effectively collect groundwater seepage. When laying the permeable geotextile 31, pay attention to flatness and overlap to avoid wrinkles and gaps.

[0036] S4. A secondary drainage pipe 4 is laid at the bottom of the water collection trough 3, and several vertically connected guide pipes 41 are then connected. Rigid permeable aggregate is then filled into the water collection trough 3 to form a rigid permeable aggregate layer 32, with the top ends of the guide pipes 41 embedded within the rigid permeable aggregate layer 32. A load-bearing cover plate 13 is installed above the water collection trough 3 at the top of the drainage area 12. When laying the secondary drainage pipe 4 and the guide pipes 41, ensure a secure connection to prevent leakage. The rigid permeable aggregate should be filled evenly and densely to ensure unobstructed drainage. When installing the load-bearing cover plate 13, ensure it is flat and stable, capable of withstanding the load during construction.

[0037] S5. Lay a base sand and gravel layer 14 at the bottom of the pipeline installation area 11 and level it so that its top surface is flush with or slightly lower than the top of the water-stop steel sheet pile 51, and compact the base sand and gravel layer 14. When laying the base sand and gravel layer 14, control the thickness and slope to ensure that it can provide stable support for the drainage channel body 2. When compacting the base sand and gravel layer 14, use equipment such as a road roller and compact it according to the specified compaction coefficient.

[0038] S6. Install the drainage channel body 2 above the base gravel layer 14, and lay a gravel stabilizing layer 15 inside the trench body 1. Bury the bottom of the drainage channel body 2 in the gravel stabilizing layer 15, and compact the gravel stabilizing layer 15, ensuring that the compaction coefficient is not less than the compaction coefficient of the base gravel layer 14. When installing the drainage channel body 2, pay attention to its position and verticality to ensure proper drainage. When laying the gravel stabilizing layer 15, ensure it evenly covers the drainage channel body 2, and when compacting the gravel stabilizing layer 15, ensure its density to enhance the stability of the drainage channel body 2.

[0039] S7. Perform layered backfilling. First, backfill the drainage channel body 2 with a higher compaction coefficient on both sides using the first backfill layer 16. Then, backfill the top of the drainage channel body 2 with a lower compaction coefficient using the second backfill layer 17. Finally, cover with the third backfill layer 18 to complete the trench construction. During backfilling, pay attention to layered compaction to ensure that the compaction coefficient of each layer meets the requirements. Backfill layers with different compaction coefficients can provide different levels of support and protection for the drainage channel body 2, improving the stability and durability of the pipeline system.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A municipal pipe trench structure for a drainage channel, characterized by, It includes a trench body (1) and a drainage channel body (2), wherein the bottom of the trench body (1) is respectively provided with: Pipe installation area (11) for installing the drainage channel body (2); Drainage area (12) is located on one side of pipeline installation area (11); A water collection trough (3) is set in the drainage area (12) and along the extension direction of the ditch body (1) to collect underground seepage water; A secondary drainage pipe (4) is laid inside the water collection tank (3). The side wall of the secondary drainage pipe (4) is connected to several blind guide pipes (41), and each of the blind guide pipes (41) is vertically arranged. A permeable retaining structure is installed in the water collection trough (3) to prevent sand from entering the diversion blind pipe (41); A vertical barrier component (5) is installed between the pipe installation area (11) and the drainage area (12) to prevent water from the collection tank (3) from seeping into the pipe installation area (11).

2. A municipal pipe trench structure of a drainage channel according to claim 1, characterized in that, The permeable retaining structure includes permeable geotextile (31) laid on the bottom and two sides of the water collection trough (3), and a rigid permeable aggregate layer (32) filled inside the water collection trough (3). The drainage sub-pipe (4) is laid at the bottom of the rigid permeable aggregate layer (32), and the top of the diversion blind pipe (41) is located inside the rigid permeable aggregate layer (32).

3. A municipal pipe trench structure of a drainage channel according to claim 2, characterized in that, A load-bearing cover plate (13) is provided in the drainage area (12) and on top of the water collection tank (3).

4. The municipal pipeline trench structure for drainage channels according to claim 3, characterized in that, The vertical barrier component (5) includes a number of water-stop steel sheet piles (51) arranged sequentially along the extension direction of the trench body (1), and a rubber waterstop strip (52) is also provided between adjacent water-stop steel sheet piles (51).

5. The municipal pipeline trench structure for drainage channels according to claim 4, characterized in that, Both sides of the water-stop steel sheet pile (51) are provided with splicing grooves (511), and adjacent water-stop steel sheet piles (51) are spliced ​​together through the splicing grooves (511).

6. The municipal pipeline trench structure for drainage channels according to claim 4, characterized in that, The bottom end of the water-stop steel sheet pile (51) extends at least 0.5m below the bottom surface of the water collection trough (3), and the top end of the water-stop steel sheet pile (51) extends at least 0.3m above the bottom surface of the pipeline installation area (11).

7. The municipal pipeline trench structure for drainage channels according to claim 6, characterized in that, The bottom of the pipeline installation area (11) is also covered with a foundation sand and gravel layer (14), and the top surface of the foundation sand and gravel layer (14) is flush with or lower than the top of the water-stop steel sheet pile (51). The drainage channel body (2) is installed above the foundation sand and gravel layer (14). A sand and gravel stabilizing layer (15) is also laid in the trench body (1) and above the foundation sand and gravel layer (14). The bottom of the drainage channel body (2) is buried in the sand and gravel stabilizing layer (15), and the compaction coefficient of the sand and gravel stabilizing layer (15) is not less than the compaction coefficient of the foundation sand and gravel layer (14).

8. The municipal pipeline trench structure for drainage channels according to claim 7, characterized in that, A first backfill layer (16) is provided inside the trench body (1) and on both sides of the drainage channel body (2). A second backfill layer (17) is provided at the top of the drainage channel body (2) and between the first backfill layers (16) on both sides. A third backfill layer (18) is also provided inside the trench body (1) and above the first backfill layer (16) and the second backfill layer (17). The compaction coefficient of the first backfill layer (16) is greater than that of the second backfill layer (17).

9. A municipal pipeline trench structure for drainage channels according to claim 8, characterized in that, The sidewalls on both sides of the trench body (1) are inclined and gradually approach each other along the direction close to the bottom wall of the trench body (1).

10. A construction process for a municipal pipeline trench structure based on the drainage channel described in claim 9, characterized in that, Includes the following steps: Step S1: Excavate the trench body (1) and make the side walls on both sides of the trench body (1) gradually approach each other along the direction close to the bottom wall of the trench body (1). At the same time, divide the bottom of the trench body (1) into a pipe installation area (11) and a drainage area (12). Step S2: At the interface between the pipeline installation area (11) and the drainage area (12), water-stop steel sheet piles (51) are driven in sequence along the extension direction of the trench body (1), and rubber water-stop strips (52) are embedded in the splicing grooves (511) of adjacent water-stop steel sheet piles (51) to form a vertical barrier component (5). Step S3: Excavate a water collection trough (3) in the drainage area (12) and lay permeable geotextile (31) on the bottom and two sides of the water collection trough (3); Step S4: Lay a drainage secondary pipe (4) at the bottom of the water collection tank (3) and vertically connect several flow guide blind pipes (41). Then fill the water collection tank (3) with rigid permeable aggregate to form a rigid permeable aggregate layer (32). The top of the flow guide blind pipe (41) is buried in the rigid permeable aggregate layer (32). Install a load-bearing cover plate (13) above the water collection tank (3) at the top of the drainage area (12). Step S5: Lay a foundation sand and gravel layer (14) at the bottom of the pipeline installation area (11) and level it so that its top surface is flush with or slightly lower than the top of the water-stop steel sheet pile (51), and compact the foundation sand and gravel layer (14). Step S6: Install the drainage channel body (2) above the foundation sand and gravel layer (14), and lay a sand and gravel stabilizing layer (15) in the trench body (1). Bury the bottom of the drainage channel body (2) in the sand and gravel stabilizing layer (15), and compact the sand and gravel stabilizing layer (15), and the compaction coefficient is not less than the compaction coefficient of the foundation sand and gravel layer (14). Step S7: Perform layered backfilling. First, backfill the first backfill soil layer (16) with a larger compaction coefficient on both sides of the drainage channel body (2). Then, backfill the second backfill soil layer (17) with a smaller compaction coefficient on the top of the drainage channel body (2). Finally, cover with the third backfill soil layer (18) to complete the trench construction.

Images