A municipal road pipe network milling and trenching construction equipment and construction method

Abstract

The application relates to a municipal road pipe network milling and digging trenching construction equipment and a construction method, and belongs to the technical field of road construction. The equipment comprises a moving base, a milling and digging assembly and a screening assembly. The milling and digging assembly and the screening assembly are sequentially installed on the moving base. The milling and digging assembly comprises a milling and digging feeding belt, an extension frame, a mounting seat, a pushing piece and a tensioning roller. The mounting seat is installed on the moving base. One end of the extension frame is connected to the mounting seat. The other end of the extension frame is slidingly arranged on the moving base. The milling and digging feeding belt is sleeved on the extension frame, mills and digs the ground, and transports the milled and dug soil into the screening assembly. The pushing piece is provided with two pushing pieces, and the two pushing pieces are installed on the mounting seat. The two pushing pieces are respectively connected to the two ends of the tensioning roller. The tensioning roller is used for tensioning the milling and digging feeding belt. The application has the effect of improving construction efficiency.

Description

Technical Field

[0001] This application relates to the field of road construction, and in particular to a construction equipment and method for milling and trenching construction of municipal road pipelines. Background Technology

[0002] In municipal engineering projects, it is often necessary to excavate trenches in roads to lay pipelines. Traditional trenching methods require manual pre-cutting of the road surface along the trenching direction, followed by the use of equipment to break up the road surface using vibration, and finally, excavators digging trenches along the broken road surface. This construction period is long, and the excavated trenches are wider at the top and narrower at the bottom, resulting in a large repair area when the road surface is repaired later. To solve these problems, a method of excavating trenches in roads by milling the road surface with a milling head has been introduced. This method eliminates the need for manual pre-cutting of the road surface, and the trenches have a consistent width from top to bottom, resulting in a smaller area of ​​road surface to be repaired after construction. Therefore, the construction method of milling trenches in road surfaces has been widely accepted.

[0003] However, during milling operations, it is usually necessary to install a milling head on the excavator's boom. The two milling wheels on the milling head, equipped with milling teeth, break and excavate the road surface to create a trench. After the trench is excavated, the milling head on the boom needs to be replaced with a screening bucket. The screening bucket is then used to excavate and screen the soil left in the trench during milling for subsequent backfilling. This process takes time to replace the milling head and screening bucket. Moreover, since both the milling head and screening bucket have a certain weight, the time spent replacing them on the boom is considerable, which reduces the overall construction efficiency. Summary of the Invention

[0004] In order to improve construction efficiency, firstly, this application provides a construction equipment for milling and trenching of municipal road pipelines.

[0005] The technical solution for a municipal road pipeline trenching construction equipment provided in this application is as follows:

[0006] The system includes a mobile base, a milling assembly, and a screening assembly. The milling assembly and screening assembly are sequentially mounted on the mobile base. The milling assembly includes a milling feed belt, a telescopic frame, a mounting base, a pusher, and a tension roller. The mounting base is mounted on the mobile base. One end of the telescopic frame is connected to the mounting base, and the other end of the telescopic frame is slidably mounted on the mobile base. The milling feed belt is fitted onto the telescopic frame to mill the ground and transport the milled soil to the screening assembly. There are two pushers, both mounted on the mounting base. The two pushers are respectively connected to the two ends of the tension roller. The tension roller is used to tension the milling feed belt. When the telescopic frame extends, causing the milling feed belt to mill, the pusher drives the tension roller to move closer to the telescopic frame. When the telescopic frame retracts, causing the milling feed belt to stop milling, the pusher drives the tension roller to move away from the telescopic frame.

[0007] By adopting the above technical solution, when the road surface needs to be milled, the telescopic frame extends, and its length allows the milling feed belt installed on the telescopic frame to come into contact with the ground. At the same time, the pusher pushes the tension roller closer to the telescopic frame, so that the telescopic frame will not easily fail to extend smoothly due to the tension of the milling feed belt reaching its limit. As the milling feed belt moves on the telescopic frame, the road surface is gradually broken up, and the broken soil is transported to the screening component for screening and subsequent backfilling operations. The movable base is used to enable the milling component to mill the road along the target direction. During the entire construction process, there is no need to replace the milling component and the screening component, thus saving the time spent on replacement and achieving the effect of improving construction efficiency.

[0008] Optionally, the telescopic frame includes a fixed frame and a movable frame. One end of the fixed frame is mounted on a mounting base, and the other end of the fixed frame is sleeved on the movable frame. The end of the movable frame away from the fixed frame is slidably mounted on a movable base. The fixed frame is provided with a drive component for driving the movable frame to slide on the fixed frame.

[0009] By adopting the above technical solution, when the drive unit is started, the drive unit can drive the movable frame to move on the fixed frame, thereby controlling the extension length of the movable frame on the fixed frame, and then controlling the milling depth of the milling feed belt when the milling feed belt is working, thereby adjusting the depth of the excavated trench.

[0010] Optionally, a driving roller is provided on the fixed frame, and a driven roller is provided on the movable frame. The milling feed belt includes a chain and multiple chain plates. The chain plates are wound around the closed loop on the driving roller and the driven roller. Each chain plate is hinged to the others and is installed on the chain. Each chain plate is provided with milling teeth and a stop plate. Multiple milling teeth are provided and are distributed at intervals along the side of the chain plate. The arrangement direction of the stop plate and the milling teeth is parallel.

[0011] By adopting the above technical solution, the active roller and the driven roller are used to realize the movement of the milling feed belt on the fixed frame and the movable frame. The milling feed belt is composed of a chain and multiple chain plates. The chain is wound around the active roller and the driven roller to reduce the probability of slippage during transmission. The milling teeth on each chain plate are used to mill the ground. The baffle plate is used to move the soil during milling and block the soil falling out from the gap between adjacent milling teeth, thereby improving the efficiency of soil transfer to the screening component.

[0012] Optionally, the driven roller is provided with crushing wheels at both ends in a detachable manner, and the crushing wheels can contact the ground before the milling teeth.

[0013] By adopting the above technical solution, the crushing wheel contacts the ground before the milling teeth on the chain plate, thus breaking the road surface first. This separates the road surface in the milling area from the non-milling area, allowing the milling teeth on the chain plate to more easily break the road surface and perform milling operations.

[0014] Optionally, the screening assembly includes a support frame, a screening hopper, and a storage hopper. The support frame is mounted on a movable base, the screening hopper is mounted on the support frame, and the storage hopper is mounted on the movable base, with the screening hopper located above the storage hopper.

[0015] By adopting the above technical solution, the screening hopper is used to screen the soil fed by the milling feed belt, thereby screening soil with different particle sizes. The storage hopper is used to store the screened soil for backfilling, thus playing the role of separating soil with different particle sizes.

[0016] Optionally, the movable base is provided with a guide groove, and a discharge port is provided in the guide groove. A movable door panel is hinged to the storage hopper, and the storage hopper can slide along the guide groove on the movable base. A connecting rod is provided on the storage hopper, and the end of the connecting rod away from the storage hopper is connected to the tension roller. The connecting rod is used to push the storage hopper to move in the direction of the discharge port.

[0017] By adopting the above technical solution, when the tension roller is driven to retract by the pusher, the milling feed belt gradually moves away from the ground and then stops the milling operation. As the tension roller retracts, the connecting rod also retracts. Since the length of the connecting rod is fixed, the retraction of the connecting rod will drive the storage hopper to move along the length of the guide groove on the moving base. The guide groove guides the storage hopper. When the storage hopper moves to the discharge port in the guide groove, the movable door is pushed open by the gravity of the soil in the storage hopper, so that the soil in the storage hopper is released, realizing the backfilling of the trench.

[0018] Optionally, a compaction assembly is provided on the mobile base. The compaction assembly includes a compaction plate and a compaction actuator. The compaction actuator is installed on the mobile base, and the compaction plate is installed on the compaction actuator.

[0019] By adopting the above technical solution, when the compaction actuator is activated, the compaction plate compacts the surface of the backfilled soil in the trench, thereby increasing the bearing capacity of the roadbed formed by the backfilled soil in the trench during subsequent repairs.

[0020] Secondly, this application also provides a construction method for milling and trenching municipal road pipeline networks, which uses the aforementioned construction equipment for milling and trenching municipal road pipeline networks, and includes the following steps:

[0021] S100: Initiate the movement of the mobile base to the target area;

[0022] S200: Start the milling assembly. The telescopic frame extends, and the pusher pushes out the tension roller. At this time, the length of the telescopic frame on the milling assembly increases, causing the milling feed belt on the telescopic frame to contact the ground and begin milling operations. The milling feed belt transports the milled soil to the screening assembly for screening.

[0023] S300: Following the direction of movement of the mobile base, pipes are buried and connected in the milled groove;

[0024] S400: After milling in the current direction is completed, the telescopic frame gradually retracts, and at the same time, the pusher drives the tension roller to retract to ensure that the milling feed belt is always in a taut state. Meanwhile, the screening component performs screening, the moving base moves in the opposite direction, and during the movement, the qualified soil screened out is sprinkled out for backfilling the milled trench.

[0025] In summary, this application includes at least the following beneficial technical effects:

[0026] 1. By setting up a milling component and a screening component on a mobile base, the milling component can transport the excavated soil to the screening component for screening while milling the road surface. The screened soil can then be used to backfill the excavated trenches. This eliminates the need to replace the milling component and the screening component, thus saving time spent on replacement and improving construction efficiency.

[0027] 2. By setting crushing wheels with a diameter larger than that of the driven roller at both ends, the driven roller can drive the crushing wheels to rotate when it rotates. The crushing wheels can contact the ground before the milling teeth on the chain plate. Thus, during the milling operation, the crushing wheels will crush the ground before the chain plate, thereby separating the road surface at the excavation site from the road surface at the adjacent position of the excavation site. This makes it easier for the milling teeth on the chain plate to perform milling operations on the road surface. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a municipal road milling and trenching construction equipment according to Embodiment 1 of this application;

[0029] Figure 2 yes Figure 1 A schematic diagram of the 3D structure behind the hidden chain plate;

[0030] Figure 3 yes Figure 1 The right view;

[0031] Figure 4 yes Figure 3 A schematic diagram of the cross-section after cutting along AA.

[0032] Explanation of reference numerals in the attached drawings: 1. Movable base; 2. Milling assembly; 3. Screening assembly; 4. Milling feed belt; 5. Telescopic frame; 6. Mounting base; 7. Pushing component; 8. Tensioning roller; 9. Fixed frame; 10. Movable frame; 11. Driving component; 12. Driving roller; 13. Driven roller; 14. Chain; 15. Chain plate; 16. Milling tooth; 17. Baffle plate; 18. Crushing wheel; 19. Support frame; 20. Screening hopper; 21. Storage hopper; 22. Guide groove; 23. Discharge port; 24. Movable door panel; 25. Connecting rod; 26. Compaction assembly; 27. Compaction plate; 28. Compaction actuator. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Example 1:

[0035] Embodiment 1 of this application discloses a construction equipment for milling and trenching of municipal roads, referring to... Figure 1 It includes a mobile base 1, a milling component 2, and a screening component 3. The milling component 2 and the screening component 3 are installed on the mobile base 1 in sequence. Tracks are provided on both sides of the mobile base 1 in the length direction to realize the movement of the mobile base 1. The milling component 2 and the screening component 3 move together with the mobile base 1.

[0036] Reference Figure 1 , Figure 2 and Figure 3The milling assembly 2 includes a milling feed belt 4, a telescopic frame 5, a mounting base 6, a pusher 7, and a tension roller 8. The mounting base 6 is fixedly mounted on the movable base 1. The telescopic frame 5 includes a fixed frame 9 and a movable frame 10. One end of the fixed frame 9 is fixedly connected to the mounting base 6, and the other end is fitted onto the movable frame 10. The movable frame 10 can slide along the length of the fixed frame 9. A drive component 11, a hydraulic cylinder, is mounted on the fixed base 9. The movable end of the drive component 11 is connected to the movable frame 10, allowing the movable frame 10 to slide on the fixed base 9, thereby adjusting the extension length of the movable frame 10 on the fixed base 9. The frame 9 is equipped with an active roller 12, and the movable frame 10 is equipped with a driven roller 13. The tension roller 8 is mounted on the mounting base 6 via pushers 7. There are two pushers 7, which are also hydraulic cylinders. The two pushers 7 are respectively mounted on both sides of the mounting base 6, and the movable ends of the two pushers 7 are respectively connected to the two ends of the tension roller 8. The tension roller 8 can rotate around its own axis between the movable ends of the two pushers 7. The milling feed belt 4 is connected end to end to form a closed loop and is wound around the active roller 12, the driven roller 13, and the tension roller 8. The mounting base 6 is equipped with a motor for driving the active roller 12. The motor does not have a braking function, which allows the output shaft connected to the active roller 12 to still rotate around its own axis when the motor stops running.

[0037] When milling operations are required on the road surface, the motor is started, and the motor drives the active roller 12 to rotate. The active roller 12 drives the driven roller 13 and the tension roller 8 to rotate together through the milling feed belt 4. At this time, the drive component 11 extends, and the push component 7 is started. The drive component 11 pushes the extension length of the movable frame 10 on the fixed frame 9 to continuously increase, while the push component 7 pushes the tension roller 8 to move closer to the line connecting the active roller 12 and the driven roller 13. This allows the milling feed belt 4 to approach the ground and mill trenches on the ground as the extension length of the movable frame 10 on the fixed frame 9 continuously increases.

[0038] The milling feed belt 4 includes two chains 14 and multiple chain plates 15. The two chains each form a closed loop and are located at both ends of the chain plate 15 along its length. The two chains 14 are respectively wound around the drive roller 12, the driven roller 13, and the tension roller 8. The multiple chain plates 15 are all mounted on the chains 14. Adjacent chain plates 15 are hinged to each other. On the side of the chain plate 15 away from the chain 14, there is a baffle plate 17 and milling teeth 16. Multiple milling teeth 16 are provided and are spaced apart along the length of the chain plate 15. The baffle plate 17 is parallel to the arrangement direction of the milling teeth 16. This allows the excavated soil to be carried out by the baffle plate 17 when the milling teeth 16 are milling the road, and then transported to the screening device.

[0039] In order to enable the milling teeth 16 on the chain plate 15 to more easily mill the road, a crushing wheel 18 is provided at each end of the driven roller 13. The crushing wheel 18 is detachably installed on the driven roller 13, so that the crushing wheel 18 can be replaced in time when the road surface is crushed for a long time. When the road needs to be milled, as the movable frame 10 extends from the fixed frame 9, the crushing wheel 18 will contact the road surface before the milling teeth 16 on the chain plate 15, so that the asphalt layer on the road surface to be milled by the milling teeth 16 is separated from the adjacent asphalt layer, so that the milling teeth 16 can more easily mill the target area on the road.

[0040] Reference Figure 2 and Figure 4 The screening assembly 3 includes a support frame 19, a screening hopper 20, and a storage hopper 21. The support frame 19 is fixedly connected to the movable base 1, while the screening hopper 20 is installed on the support frame 19. The height of the screening hopper 20 on the support frame 19 is lower than the connection height between the fixed frame 9 and the mounting base 6, which allows the soil at the milled area to fall smoothly into the screening hopper 20 after being transported. Two screening rollers are installed in the screening hopper 20. One screening roller is fixedly installed in the screening hopper 20, while the other screening roller is pushed by a hydraulic cylinder installed on the screening head, thereby making the distance between the two screening rollers adjustable, thus controlling the particle size of the soil particles screened.

[0041] The storage hopper 21 is mounted on the movable base 1. Located below the screening hopper 20, the storage hopper 21 receives the soil screened out by the screening hopper 20. A guide groove 22 is provided on the movable base 1, and a discharge port 23 is provided within the guide groove 22. A movable door plate 24 is hinged to the bottom of the storage hopper 21, with its hinge axis close to the support base. The extension direction of the guide groove 22 is consistent with the length direction of the movable base 1. The storage hopper 21 is located within the guide groove 22 and can extend along the length direction of the guide groove 22. The hopper 21 is slidable, with connecting rods 25 hinged to both sides. The end of the connecting rod 25 away from the hopper is hinged to the end of the tension roller 8. This means that when the pusher 7 drives the tension roller 8 to retract, the connecting rod 25 will push the hopper 21 to move towards the discharge port 23 in the guide groove 22. When the hopper 21 moves to directly above the discharge port 23, the movable door 24 will be opened by the gravity of the soil in the hopper 21, thereby realizing the discharge of material from the hopper 21 at the discharge port 23.

[0042] A compaction assembly 26 is also provided between the support base and the mounting base 6. The compaction assembly 26 includes a compaction plate 27 and a compaction actuator 28. The compaction actuator 28 is a hydraulic cylinder. The compaction actuator 28 is installed on the movable base 1 and connected to the compaction plate 27. The compaction plate 27 is located below the movable base 1. When the storage hopper 21 releases the stored soil, the compaction actuator 28 is activated, driving the compaction plate 27 to compact the backfilled soil in the trench, so as to increase the stability of the roadbed formed after backfilling the soil.

[0043] The implementation principle of this application embodiment is as follows: The movable base 1 moves to the area to be milled, and then the motor connected to the active roller 12 is started. The active roller 12 starts to rotate, and then the drive component 11 and the push component 7 start synchronously. The drive component 11 extends the movable frame 10 from the fixed frame 9. At the same time, the push component 7 pushes the tension roller 8 toward the line connecting the active roller 12 and the driven roller 13. During the extension of the movable frame 10, the crushing wheel 18 on the driven roller 13 first contacts the ground and then crushes the ground. As the movable frame 10 continues to extend, the ground between the milling feed belt 4 and the two crushing wheels 18 is milled. The movable base 1 starts to move along the target direction and then mills a trench on the road. During the milling process, the milling feed belt 4 simultaneously transports the milled soil to the screening hopper 20. The screening hopper 20 screens the soil, so that the soil particles with smaller particle sizes fall into the storage hopper 21 for storage.

[0044] During the trench milling process, workers lay the pipeline along the already milled trench. After the trench is milled, the drive unit 11 and the pusher 7 start synchronously again. The drive unit 11 reduces the extension distance of the movable frame 10 on the fixed frame 9 until the height of the milling feed belt 4 is above the ground and then stops retracting. The tension wheel continues to tension the milling feed belt 4 under the action of the pusher 7 retracting. However, the tension wheel does not return to the original point at this time. Then the moving base 1 continues to travel a distance so that the pipeline can be laid to the end of the trench. Then the moving base 1 travels in the opposite direction, and the drive unit 11 and the pusher 7 retract further. The tension wheel returns to the original position, and the storage hopper 21 begins to backfill the trench with soil after the pipeline is laid. As the moving base 1 moves, the compaction actuator 28 starts to compact the backfilled trench until the entire trench is backfilled and compacted.

[0045] Example 2:

[0046] Embodiment 2 of this application discloses a construction method for milling and trenching of municipal road pipelines, which uses a construction equipment for milling and trenching of municipal road pipelines as described in Embodiment 1 above, and includes the following steps:

[0047] S100: Start the mobile base 1 to move to the target area;

[0048] S200: Start the milling assembly 2, extend the telescopic frame 5, and simultaneously push the tension roller 8 out of the pusher 7. At this time, the length of the telescopic frame 5 on the milling assembly 2 increases, which causes the milling feed belt 4 on the telescopic frame 5 to contact the ground and begin the milling operation. The milling feed belt 4 transports the milled soil to the screening assembly 3 for screening.

[0049] S300: Following the moving direction of the mobile base 1, the pipe is buried and connected in the milled groove;

[0050] S400: After the current direction milling is completed, the telescopic frame 5 gradually retracts, and at the same time the pusher 7 drives the tension roller 8 to retract to ensure that the milling feed belt 4 is always in a tensioned state. At the same time, the screening component 3 performs screening, the moving base 1 moves in the opposite direction, and during the movement, the qualified soil screened out is sprinkled out for backfilling the milled trench, and the compaction actuator 28 compacts the back trench after backfilling the soil.

[0051] S500: Asphalt is laid on compacted soil.

[0052] 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 road pipe network trenching construction equipment, characterized in that: The utility model provides a movable base (1), milling and digging assembly (2) and screening assembly (3), milling and digging assembly (2) and screening assembly (3) are installed on movable base (1) in proper order, milling and digging assembly (2) includes milling and digging feeding belt (4), telescopic frame (5), mounting seat (6), pusher (7) and tension roller (8), mounting seat (6) is installed on movable base (1), one end of telescopic frame (5) is fixedly connected on mounting seat (6), the other end of telescopic frame (5) is slidably arranged on movable base (1), the milling and digging feeding belt (4) is set on telescopic frame (5) and carries out milling and digging to ground and transports the earth that mills and digs to screening assembly (3), pusher (7) is provided with two and is installed on mounting seat (6), two pusher (7) are connected with both ends of tension roller (8) respectively, and tension roller (8) is used for tensioning milling and digging feeding belt (4), when telescopic frame (5) extends, makes milling and digging feeding belt (4) carry out milling and digging, pusher (7) drives tension roller (8) and moves towards the direction close to telescopic frame (5), when telescopic frame (5) retracts, makes milling and digging feeding belt (4) stop milling and digging, pusher (7) drives tension roller (8) and moves away from the direction of telescopic frame (5), screening assembly (3) includes support frame (19), screening bucket (20) and storage hopper (21), support frame (19) is installed on movable base (1), screening bucket (20) is installed on support frame (19), storage hopper (21) is installed on movable base (1), screening bucket (20) is located above storage hopper (21), two screening rollers are arranged in screening bucket (20), one of the screening rollers is fixedly installed in screening bucket (20), and the other screening roller is pushed by the hydraulic cylinder installed on screening bucket (20), so that the distance between the two screening rollers is adjustable, thereby controlling the particle size of the screened earth particles.The mobile base (1) is provided with a guide groove (22), the guide groove (22) is provided with a discharge port (23), the storage hopper (21) is hinged with a movable door plate (24), the storage hopper (21) can slide on the mobile base (1) along the guide groove (22), the storage hopper (21) is provided with a connecting rod (25), the connecting rod (25) is connected with the tensioning roller (8) away from the storage hopper (21), the connecting rod (25) is used for pushing the storage hopper (21) to move towards the direction of the discharge port (23), when the pushing piece (7) drives the tensioning roller (8) to retract, the connecting rod (25) pushes the storage hopper (21) to move in the guide groove (22) towards the direction of the discharge port (23), when the storage hopper (21) moves to the top of the discharge port (23), the movable door plate (24) is opened under the gravity of the soil in the storage hopper (21), thereby realizing the discharge of the storage hopper (21) at the discharge port (23); The mobile base (1) is provided with a compaction assembly (26), the compaction assembly (26) comprises a compaction plate (27) and a compaction executor (28), the compaction executor (28) is installed on the mobile base (1), the compaction plate (27) is installed on the compaction executor (28), when the storage hopper (21) discharges the stored soil, the compaction executor (28) is started, drives the compaction plate (27) to compact the backfill soil in the groove, to increase the stability of the roadbed formed after the backfill soil.

2. The municipal road pipe network trenching construction equipment according to claim 1, characterized in that: The telescopic frame (5) comprises a fixed frame (9) and a movable frame (10), the fixed frame (9) is installed on the mounting base (6), the other end of the fixed frame (9) is sleeved on the movable frame (10), the end of the movable frame (10) away from the fixed frame (9) is slidably arranged on the mobile base (1), and the fixed frame (9) is provided with a driving piece (11) for driving the movable frame (10) to slide on the fixed frame (9).

3. The municipal road pipe network trenching construction equipment according to claim 2, characterized in that: The fixed frame (9) is provided with a driving roller (12), the movable frame (10) is provided with a driven roller (13), the milling feeding belt (4) comprises a chain (14) and a plurality of chain plates (15), the chain plates (15) are arranged around the driving roller (12) and the driven roller (13), the chain plates (15) are hingedly connected and are installed on the chain (14), each chain plate (15) is provided with a milling tooth (16) and a material blocking plate (17), the milling tooth (16) is provided with a plurality of intervals along the side edge of the chain plate (15), and the arrangement direction of the material blocking plate (17) is parallel to the milling tooth (16).

4. The municipal road pipe network trenching construction equipment according to claim 3, characterized in that: The two ends of the driven roller (13) are respectively provided with a crushing wheel (18) in a detachable manner, and the crushing wheel (18) can be in contact with the ground before the milling tooth (16).

5. A method for trenching a municipal road pipe network, using the trenching construction equipment according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S100: start the mobile base (1) to move to the target area; S200: start the milling assembly (2), the telescopic frame (5) is extended, and the pushing piece (7) pushes the tensioning roller (8) out, at this time, the length of the telescopic frame (5) on the milling assembly (2) is increased, so that the milling feeding belt (4) on the telescopic frame (5) is in contact with the ground to start the milling operation, and the soil milled by the milling feeding belt (4) is transported to the screening assembly (3) for screening S300: follow the moving direction of the mobile base (1), bury the pipeline in the milled groove and connect it; S400: after the milling in the current direction is completed, the telescopic frame (5) is gradually retracted, the pushing piece (7) drives the tensioning roller (8) to retract, so that the milling feeding belt (4) is always in a tensioning state, the screening assembly (3) screens, the mobile base (1) moves reversely, and the qualified soil screened out is sprayed for backfilling the milled groove during the movement.

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