Drainage pipe rotary excavation micro-injury repair method

Abstract

The application relates to a sewer rotary digging micro-injury repair method, belonging to the pipeline repair field. The sewer rotary digging micro-injury repair method is used for dredging and cleaning the blocked part of the pipeline after the pipeline under the road surface is damaged; the upstream and downstream of the pipeline damage part are respectively ring-cut to obtain a ring-cut pipeline section; the asphalt structure is cut downwards to the pipeline damage part to rotary dig and take out the soil, and the ring-cut pipeline section is taken out; the rotary digging hole is cleaned and a protection cylinder is fixed; the pipeline damage part is cleaned and the pipe foundation is reinforced; the air bag is passed through the inner pipe, the two ends of the inner pipe are respectively inserted into the upstream pipeline and the downstream pipeline of the pipeline damage part, the air bag is inflated to support the outer wall of the inner pipe to adhere to the inner walls of the upstream pipeline and the downstream pipeline of the pipeline damage part; the collapsed area outside the pipeline damage part is poured with slow-setting concrete for roadbed backfilling, road surface recovery construction and air bag taking out. The sewer rotary digging micro-injury repair method has the advantages of improving the leakage and softening foundation of the blocked position, sealing and reinforcing the pipeline interface, and safely and stably repairing the small-injury road surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline repair, in particular, relates to a drainage pipe rotary excavation micro-wound repair method. BACKGROUND

[0002] The urban underground sewage pipe network often needs to pass through the roadbed, and the sewage pipe network often causes the pipe to be damaged by the extrusion of backfilled sharp stones, the pipe to be disconnected and water to leak, and the local subsidence of the roadbed and road surface during operation. Currently, the inner lining method is often used for repair.

[0003] The following problems exist when repairing the sewage pipe network under the road: 1. The damaged part leaks for a long time, and the soil at the leakage point becomes soft, causing local subsidence of the road surface of more than 5 cm, which increases the difficulty of repair; 2. The inner lining method changes the pipe diameter of the sewage pipe network, and the repaired pipe is prone to neck-type blockage; 3. Local damage to the pipe can cause the pipe joint to be disconnected, the pipe head to be deformed, and the upper part to be eroded by water, making it difficult to repair; 4. For small node blockage, the open excavation method is used for repair, which causes large excavation wounds on the road and long construction time, and poor construction safety; 5. The repair interface is often glued, filled with inner lining cement slurry, and the repair interface is prone to falling off and re-leakage due to long-term erosion by sewage.

[0004] Therefore, a drainage pipe rotary excavation micro-wound repair method is needed to repair the damaged pipe under the road and overcome the above-mentioned defects. SUMMARY

[0005] The purpose of the present application is to provide a drainage pipe rotary excavation micro-wound repair method, which has the advantages of improving the leakage and softening of the foundation at the blockage position, sealing and reinforcing the pipe interface, and safely and stably repairing the small wound on the road surface.

[0006] The present application is implemented as follows:

[0007] The present application provides a drainage pipe rotary excavation micro-wound repair method, which comprises the following steps:

[0008] The blocked part of the pipe damaged under the road surface is dredged and cleaned;

[0009] The upstream and downstream of the damaged part of the pipe are respectively ring-cut to obtain a ring-cut pipe section;

[0010] The asphalt structure is cut downward, and the soil is excavated to the damaged part of the pipe after the asphalt structure is cut downward, and the ring-cut pipe section is removed;

[0011] The rotary excavation hole is cleaned and fixed after the rotary excavation hole is cleaned and fixed;

[0012] The damaged part of the pipe is cleaned and the pipe foundation is reinforced;

[0013] Pass the airbag through the inner tube, insert the two ends of the inner tube into the upstream and downstream pipes of the damaged pipe respectively, and inflate the airbag to support the outer wall of the inner tube to fit the inner wall of the upstream and downstream pipes of the damaged pipe;

[0014] Pour slow-setting soil into the collapsed area outside the damaged pipe;

[0015] Carry out roadbed backfill and road surface restoration construction;

[0016] Remove the air bag.

[0017] In some optional implementation schemes, the blocked portion of the damaged pipe under the road surface is cleared and cleaned, the blockage in the blocked portion of the damaged pipe is removed, the blocked portion is drilled through with a drill rod, the water in the pipe is discharged, and the water inlet of the well chamber upstream of the pipe is sealed.

[0018] In some optional implementation schemes, when performing circumferential cutting on the upstream and downstream of the damaged pipe, the inner wall of the pipe is flushed with water from the upstream of the damaged pipe, and then the circumferential cutting vehicle is pushed toward the damaged pipe upstream and downstream until it cannot move. The road surface position is determined according to the positioning device and the circumferential cutting position is matched with the road surface settlement area before cutting the pipe.

[0019] In some optional implementation schemes, after the asphalt structure of the road surface is cut downward, soil is extracted by rotary drilling to the damaged part of the pipe, a grid line is arranged with the connecting line of the ring-cut pipe section as the center line, and the minimum repair diameter is determined according to the grid line and the road surface settlement area. The asphalt structure of the road surface is cut and broken along the determined grid line area and the minimum repair diameter, and then a rotary drilling rig is used to rotary drill soil according to the pile diameter. After the ring-cut pipe section is removed, rotary drilling is continued to a depth of more than 20 cm below the original soil base surface.

[0020] In some optional implementation schemes, when installing and fixing the casing after cleaning the rotary drilling channel, a fixed pick rod is installed on the top of the casing for hanging and fixing, the gap between the rotary drilling channel and the casing is sealed with mortar, and protective tiles are installed on the pipeline working surface at the bottom of the casing.

[0021] In some optional implementation schemes, when cleaning the damaged pipe, the side walls of the collapsed area are repaired and mortar is sprayed to protect the wall. The soil in the upstream and downstream pipes of the damaged pipe and the soil on the rotary drilling base are removed, so that the leakage length of the upstream and downstream pipes of the damaged pipe is more than 12 cm. The upstream and downstream pipes of the damaged pipe are flushed, and the mud and water in the rotary drilling base are drained.

[0022] In some optional implementation schemes, when reinforcing the pipe base, crushed stone layers and sand and gravel layers are laid to the bottom of the rotary drilling base in sequence and compacted and leveled.

[0023] In some alternative embodiments, before the two ends of the inner tube are inserted into the upstream pipeline and the downstream pipeline respectively, a ring wire is sleeved on the outer wall of the inner tube, and the two ends of the ring wire are sleeved on the outer walls of the upstream pipeline and the downstream pipeline respectively through adhesive connection.

[0024] In some alternative embodiments, when the two ends of the inner tube are inserted into the upstream pipeline and the downstream pipeline respectively, the inner walls of the upstream pipeline and the downstream pipeline are coated with adhesive, and the inner tube is moved reciprocally along the axial direction to connect the inner tube with the inner walls of the upstream pipeline and the downstream pipeline.

[0025] In some alternative embodiments, before the ring wire is sleeved on the outer wall of the inner tube, a plurality of main reinforcement bars are connected on the outer wall of the ring wire.

[0026] The beneficial effects of the present application are as follows: the drainage pipe rotary excavation minimally invasive repair method provided by the present application comprises the following steps: dredging and cleaning the blocked part after the pipeline breakage under the road surface; ring cutting the upstream and downstream of the pipeline breakage to obtain a ring cut pipeline section; rotary excavation of soil to the pipeline breakage after cutting the asphalt structure downward of the road surface, and taking out the ring cut pipeline section; installing a casing for fixation after cleaning the rotary excavation hole; cleaning the pipeline breakage and reinforcing the pipe foundation; inserting the air bag through the inner tube, inserting the two ends of the inner tube into the upstream pipeline and the downstream pipeline respectively, inflating the air bag to support the outer wall of the inner tube to adhere to the inner walls of the upstream pipeline and the downstream pipeline; pouring slow-setting concrete to backfill the roadbed and restore the road surface at the collapsed area outside the pipeline breakage; and taking out the air bag. The drainage pipe rotary excavation minimally invasive repair method provided by the present application cuts the pipeline after dredging and cleaning the pipeline, uses the rotary excavation method to remove the soaked soil and process the pipe foundation, uses the air bag to support the inner tube to repair the ring cut pipeline, pours concrete and restores the road surface, and finally recovers the air bag, thereby solving the leakage and blockage caused by local damage and disconnection of the drainage pipe, and improving the leakage and softening of the blocked position, reinforcing the pipeline interface, and safely and stably repairing the small wound of the road surface. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 The flowchart of the drainage pipe rotary excavation minimally invasive repair method provided by the embodiments of the present application is shown in the figure.

[0029] Figure 2A schematic diagram of dredging and cleaning of the blocked part of the pipeline under the road surface in the method for repairing a rotary excavating micro-trauma of a drainage pipe provided by the embodiment of the present application;

[0030] Figure 3 A schematic diagram of rotary excavating construction in the method for repairing a rotary excavating micro-trauma of a drainage pipe provided by the embodiment of the present application;

[0031] Figure 4 A schematic diagram of construction of using an air bag to block the ring-cut pipe section in the method for repairing a rotary excavating micro-trauma of a drainage pipe provided by the embodiment of the present application.

[0032] In the figure: 100, road surface; 110, pipeline; 120, ring-cut vehicle; 130, rotary excavating machine; 140, casing; 150, jib; 160, protective tile; 170, rotary excavating hole; 180, leveling layer; 190, air bag; 200, inner pipe; 210, ring wire; 220, main reinforcement; 230, concrete layer. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of the present application.

[0035] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0037] Furthermore, the terms "horizontal", "vertical", "suspended", and the like, do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0040] The features and performance of the sewer rotary digging micro-wound repair method of the present application are further described in detail below in conjunction with the embodiments.

[0041] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present application provides a sewer rotary digging micro-wound repair method, which comprises the following steps:

[0042] Step 1: dredge and clean the blocked part after the pipeline 110 under the road surface 100 is broken; use a dredging hook to hook out and remove the blockage in the blocked part after the pipeline 110 is broken, use a drill rod to drill through the blocked part, discharge the water in the pipeline 110, and block the water inlet of the upstream well chamber of the pipeline 110, dredge the blocked part after the pipeline 110 is broken to no flocculent blockage, and use a scoop shovel to dredge the soil in the pipeline 110.

[0043] Step two, the upstream and downstream of the damaged part of the pipeline 110 are respectively ringed to obtain a ringed pipe section; the inner wall of the pipeline 110 is flushed from the upstream of the damaged part of the pipeline 110, and after the flushing water flows away from the drill hole of the drill pipe, the ring cutting vehicle 120 is pushed to the damaged part of the pipeline 110 from the upstream and downstream of the damaged part of the pipeline 110 respectively until it cannot move, the position of the road surface 100 is determined according to the positioning device arranged on the ring cutting vehicle 120, and the ring cutting position is matched with the settlement area of the road surface 100, and when the ring cutting position is matched with the position of the settlement area of the road surface 100, the size error is ≦2m, the pipeline 110 is cut to obtain a ringed pipe section.

[0044] Step three, after the asphalt structure of the road surface 100 is cut downward, the rotary excavator 130 is used to excavate the rotary excavation tunnel 170 to the damaged part of the pipeline 110 to take out the ringed pipe section; the center line of the connecting line of the ringed pipe section is arranged as a square line, and the minimum repair caliber is determined according to the square line and the settlement area of the road surface 100, the asphalt structure of the road surface 100 is cut along the determined square line area and the minimum repair caliber, and then the rotary excavator is used to excavate the soil according to the pile diameter, until the ringed pipe section is excavated out, the rotary excavation continues until all the soft soil soaked by water is taken out, and the rotary excavation continues until the depth of the original soil surface is more than 20cm; wherein the minimum repair caliber is ≧0.8m; in this embodiment, the diameter of the rotary excavation tunnel 170 is ≧800mm.

[0045] Step four, after the rotary excavation tunnel 170 is cleaned, the casing 140 is installed and fixed; the floating soil on the side wall of the rotary excavation tunnel 170 is cleaned, the appropriate casing 140 is selected according to the depth of the side wall of the rotary excavation tunnel 170 and installed in the rotary excavation tunnel 170, and the fixed cantilever 150 is installed and fixed on the top of the casing 140 for suspension, the gap between the rotary excavation tunnel 170 and the casing 140 is blocked by artificial entering the bottom of the rotary excavation tunnel 170, the fan-shaped protective tile 160 is installed on the pipeline working surface at the bottom of the casing 140. In this embodiment, the cantilever 150 is arranged in 3-6 groups along the circumference of the casing 140, and the cantilever 150 and the casing 140 are connected by bolts or pins; the protective tile 160 and the casing 140 are connected by self-tapping screws; the included angle between the protective tile 160 and the generatrix of the casing 140 is 120-150 degrees, the length of the protective tile 160 is 30-50cm, the fan-shaped width of the root of the protective tile 160 is 15-20cm, and the fan-shaped width of the end is ≧ the pipe diameter of the casing 140.

[0046] Step five, clean up the pipe 110 breakage and strengthen the pipe base; repair the collapse area side wall and spray mortar wall, manually remove and remove the soil in the upstream pipe 110 and downstream pipe 110 of the pipe 110 breakage and the soil in the rotary excavation surface, so that the length of the pipe 110 breakage upstream pipe 110 and downstream pipe 110 is more than 12 cm, flush the upstream pipe 110 and downstream pipe 110 of the pipe 110 breakage, dry the mud water in the rotary excavation surface, when reinforcing the pipe base, lay 10-20 cm thick gravel layer and 10-15 cm thick sand gravel layer in turn at the bottom of the rotary excavation surface, and use the flat rammer of the excavator to compact and flatten the flat leveling layer 180.

[0047] Step six, inflate the gas in the cylindrical gas bag 190 to 40%-60% volume of gas, pass through the inner tube 200, connect the main reinforcement 220 arranged along the circumference on the outer wall of the ring wire 210, set the ring wire 210 on the outer wall of the inner tube 200, pull the upstream ring wire 210 to tightly wrap the ring wire 210 and the inner tube 200 on the gas bag 190, brush the fixing glue on the ring wire 210 and fix it on the outer wall of the inner tube 200, and use the film to wrap the place where the glue is brushed on the ring wire 210 to form a gas bag body, move the gas bag body from the downstream of the pipe 110 breakage to the upstream of the pipe 110 breakage through the pipe 110 to the ring cutting pipe section, manually enter the rotary excavation hole to untie the film and set the two ends of the ring wire 210 on the outer wall of the upstream pipe 110 and the downstream pipe 110 of the pipe 110 breakage through the adhesive connection, and insert the two ends of the inner tube 200 into the upstream pipe 110 and the downstream pipe 110 of the pipe 110 breakage, inflate the gas bag 190 to 80%-90% volume of gas, coat the adhesive on the inner wall of the upstream pipe 110 and the downstream pipe 110 of the pipe 110 breakage, and move the inner tube 200 axially to make the inner tube 200 and the inner wall of the upstream pipe 110 and the downstream pipe 110 of the pipe 110 breakage fully adhere, and inflate the gas bag 190 to 98%-105% volume of gas and stabilize the pressure.

[0048] Step seven, pour the slow-setting concrete on the outside of the pipe 110 breakage; after adjusting the positions of the ring wire 210 and the main reinforcement 220, disassemble the protective tile 160 installed at the bottom of the casing 140, start pouring and vibrating concrete into the rotary excavation hole 170 using the guide cylinder 170, pour and fill the collapse area, fill the concrete to the base surface of the rotary excavation hole 170 to obtain the concrete layer 230, and pull the protective tile to the completion surface of the poured concrete.

[0049] Step eight, roadbed backfilling, road surface 100 recovery construction; after the concrete layer 230 is poured and the concrete layer 230 is initially cured, 10-15 cm of gravel is spread on the surface of the concrete layer 230, then the casing 140 is removed, the roadbed soil is backfilled and tamped in layers using rotary excavation to the water stable layer base surface, C15 concrete is poured to fill the water stable layer, the surface is brushed, then after the water stable layer concrete is finally cured, the surface is coated with a primer layer, a joint waterproof layer, an adhesion layer, and the road surface 100 is recovered in a timely manner according to the original design requirements.

[0050] Step nine, the air bag 190 is removed; after the road surface 100 is recovered, the upstream well chamber water inlet blocking material of the pipeline 110 is removed, the air bag 190 is pulled upstream and downstream in a reciprocating manner while being deflated to loosen the air bag 190, the air bag 190 is deflated to an internal gas volume storage amount ≦ 30%, and the air bag 190 is pulled downstream to be removed.

[0051] The drainage pipe rotary excavation micro-injury repair method provided by the embodiment of the present application solves the problems of pipeline 110 blockage, soft soil body that cannot be replaced, and cavity that cannot be filled and compacted by first dredging and cleaning the blocked part of the pipeline 110 after damage, then obtaining a ring-cut pipe section by ring-cutting the damaged part of the pipeline 110, then solving the problems by using rotary excavation to open a rotary excavation hole 170 on the ground to remove the ring-cut pipe section, cleaning and reinforcing the damaged part of the pipeline 110, inflating the air bag 190, passing the air bag through the inner tube 200, and forming an air bag body by sleeving the ring wire 210 connected to the main reinforcement 220 outside the inner tube 200, moving the air bag body to the ring-cut pipe section to connect the upstream pipeline 110 and the downstream pipeline 110 of the damaged part of the pipeline 110, and finally pouring slow-setting concrete on the collapsed area outside the damaged part of the pipeline 110, backfilling the roadbed, recovering the air bag 190 after the road surface 100 recovery construction, which can realize leakage and soft foundation improvement at the blocked position, pipeline 110 interface sealing and reinforcement, and small-injury safe and stable repair of the road surface 100, ensure the repair quality of the pipeline 110, and the method is designed for repair construction of a pipe section with a diameter ≦ 2 m, effectively solves the problems in repair construction, removes the soft soil layer, improves the construction efficiency of excavation and soil removal, reduces the cost of short-time repair measures, saves costs, standardizes the construction method, and ensures the repair quality, structural stability, and construction safety.

[0052] The broken and blocked ring cutting pipe section is taken out by using ring cutting and post-rotation digging, which can well utilize the pulling force of the ring cutting to loosen the pipe opening, make the soft soil layer rotate and gather to the ring cutting hole, effectively form a collapsed hole cavity, and ensure manual assistance during the construction process of the air bag body; the ring cutting hole is supported by the casing 140, which can effectively ensure the safety of the foundation pit construction; the casing 140 is installed with a protective tile 160 and the side of the collapsed hole cavity is repaired and sprayed with mortar, which can effectively ensure the safety of manual operation into the ring cutting hole, avoid the collision of the operation tool with the side wall of the collapsed hole cavity, and ensure the construction quality and collapse risk. The gravel, sand, and gravel are used as the leveling layer 180 to compactly replace and fill the foundation, which can greatly reduce the influence of the mud on the poured concrete. The air bag supporting inner tube 200 is used, and the ring wire 210 connected with the main reinforcement 220 outside the inner tube 200 well ensures the stability and operability of the inner tube 200 structure passing through the pipeline. By using the inner tube 200 to repair the ring cutting pipe section, the misalignment of the pipe end can be reduced, the connection tightness with the concrete can be ensured, and the air bag can be smoothly separated. By setting the air bag, the inner tube can play a role during pouring of the concrete, and can also adapt to the smooth connection under the condition of pipe head deformation, and further ensure the smoothness of the pipeline. The ring wire 210 and the main reinforcement 220 can effectively tighten the inner tube 200 and the air bag, and avoid using other measures to fix and structure to prevent separation.

[0053] The drainage pipe rotary digging minimally invasive repair method provided by the embodiments of the present application effectively controls the construction difficulties, solves various problems that may occur during construction, greatly ensures the repair quality, structural stability, and construction safety, effectively solves the problems of pipeline blockage, soft soil body that cannot be replaced and filled, cavity that cannot be filled and compacted, inner lining misalignment and pollution resistance, poor repair interface sealing and connection, large open excavation repair wound and long influence on passing time, and the like.

[0054] The embodiments described above are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

Claims

1. A method of repairing a drainpipe rotary excavated micro-wound, characterized by, It comprises the following steps: The blocked part of the pipeline under the road surface after the pipeline is damaged is dredged and cleaned. The upstream and downstream of the damaged pipeline are respectively ring-cut to obtain a ring-cut pipeline section. After cutting the asphalt structure downward from the road surface, the soil is excavated to the damaged pipeline, and the ring-cut pipeline section is removed. After cleaning the rotary excavation hole, the casing is installed and fixed. The damaged pipeline is cleaned and the pipe foundation is reinforced. When reinforcing the pipe foundation, the gravel layer and the sand gravel layer are laid in turn at the bottom of the rotary excavation base surface and are tamped and leveled. The air bag is passed through the inner tube, the two ends of the inner tube are inserted into the upstream and downstream pipelines of the damaged pipeline respectively, the air bag is inflated to support the outer wall of the inner tube to fit the inner walls of the upstream and downstream pipelines of the damaged pipeline, before the two ends of the inner tube are inserted into the upstream and downstream pipelines of the damaged pipeline, a ring wire is sleeved on the outer wall of the inner tube, and the two ends of the ring wire are sleeved on the outer walls of the upstream and downstream pipelines of the damaged pipeline through adhesive connection, and before the ring wire is sleeved on the outer wall of the inner tube, a plurality of main reinforcement bars are connected on the outer wall of the ring wire. The collapsed area outside the damaged pipeline is poured with slow-setting concrete. The roadbed is backfilled and the road surface is restored. The air bag is removed.

2. The method of claim 1, wherein, When dredging and cleaning the blocked part of the pipeline under the road surface after the pipeline is damaged, the blockage in the blocked part of the damaged pipeline is removed, a drill rod is used to drill through the blocked part, water in the pipeline is discharged, and the water inlet of the upstream well chamber of the pipeline is blocked.

3. The method of claim 1, wherein the method further comprises: When the upstream and downstream of the damaged pipeline are respectively ring-cut, the inner wall of the pipeline is flushed from the upstream of the damaged pipeline, and then the ring-cut vehicle is pushed to the damaged pipeline from the upstream and downstream respectively until it cannot move, the pipeline is cut after the road surface position is determined by the positioning device and the ring-cut position is matched with the road surface settlement area.

4. The method of claim 1, wherein the method further comprises: When the soil is excavated to the damaged pipeline after cutting the asphalt structure downward from the road surface, a square line is arranged with the connecting line of the ring-cut pipeline section as the center line, the minimum repair caliber is determined according to the square line and the road surface settlement area, the road surface is cut along the determined square line area and the minimum repair caliber to break the road asphalt structure, then the rotary drilling machine is used to excavate the soil according to the pile diameter, and after the ring-cut pipeline section is removed, the rotary drilling is continued to a depth of more than 20 cm below the original color soil base surface.

5. The method of claim 1, wherein the method further comprises: When the casing is installed and fixed after the rotary excavation hole is cleaned, a cantilever is installed and fixed at the top of the casing for suspension and fixation, mortar is used to seal the gap between the rotary excavation hole and the casing, and a protective tile is installed on the pipeline working surface at the bottom of the casing.

6. The method of repairing a drain pipe with a minimally invasive incision by rotary excavation according to claim 1, wherein, When the damaged pipeline is cleaned, the collapsed area side wall is repaired and the mortar is sprayed to protect the wall, the soil in the upstream and downstream pipelines of the damaged pipeline and the soil on the rotary excavation base surface are removed, the outer leakage length of the upstream and downstream pipelines of the damaged pipeline is more than 12 cm, the upstream and downstream pipelines of the damaged pipeline are flushed, and the mud water in the rotary excavation base surface is pumped dry.

7. The method of repairing a drain pipe with a minimally invasive incision by rotary excavation according to claim 1, wherein, When the two ends of the inner tube are respectively inserted into the upstream and downstream pipelines of the damaged pipeline, adhesive is applied to the inner walls of the upstream and downstream pipelines of the damaged pipeline, and the inner tube is moved back and forth along the axial direction, so that the inner tube is connected with the inner walls of the upstream and downstream pipelines of the damaged pipeline.

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