Drainage pipe rotary excavating micro-wound repairing method

Abstract

The invention discloses a drainage pipe rotary excavating micro-wound repairing method and relates to the field of pipeline repairing. The rotary excavating micro-wound repairing method for the drainage pipe comprises the following steps: dredging and cleaning a blocked part after a pipeline below a road surface is damaged; the upstream part and the downstream part of the damaged part of the pipeline are annularly cut to obtain annularly-cut pipe sections; after an asphalt structure is cut downwards on the road surface, soil is dug in a rotary mode to the damaged position of the pipeline, and the girdling pipe section is taken out; after the rotary digging hole channel is cleaned, a pile casing is installed for fixing; cleaning the damaged part of the pipeline and reinforcing the pipe base; the air bag penetrates through the inner pipe, the two ends of the inner pipe are inserted into the upstream pipeline and the downstream pipeline at the pipeline damage position respectively, and the air bag is inflated to support the outer wall of the inner pipe to be attached to the inner walls of the upstream pipeline and the downstream pipeline at the pipeline damage position; pouring delayed coagulation soil in a collapse area outside the damaged part of the pipeline for roadbed backfilling and pavement restoration construction; taking out the airbag. The drainage pipe rotary excavating micro-wound repairing method has the advantages that the leakage foam soft foundation at the blocked position is improved, the pipeline connector is sealed and reinforced, and the small wound of the road surface is safely and stably repaired.

Description

Technical Field

[0001] The present application relates to the field of pipeline repair, and in particular to a method for repairing a minimally invasive incision in a drainage pipe by rotary drilling. Background Art

[0002] Urban underground sewage pipe networks often need to be laid through road subgrades. During operation, sewage pipe networks often face problems such as damage to pipes due to backfill sharp stones squeezed by heavy vehicle ballasting, pipe disconnection and leakage, and local settlement of the subgrade and pavement. Currently, the lining method is mostly used for repair.

[0003] The following difficulties exist in the repair construction of the sewage pipe network under the road: 1. The damaged opening has been leaking for a long time, and the soil at the leakage point has become soft soil. The road surface has partially settled more than 5 cm, which increases the difficulty of repair; 2. The lining method of repair changes the diameter of the sewage pipe network, and it is easy to cause pipe necking blockage after repair; 3. The damaged pipe is prone to joint disconnection and deformation of the pipe head due to uneven settlement, and it is eroded by water, and there is a hollow surface on the upper part, which is difficult to fill in the repair; 4. For small node blockages, open excavation repair is required. The road excavation incision is large, the construction time is long, and the construction safety is poor; 5. The repair interface is mostly glued and lined with cement slurry. The repair interface is easily eroded by sewage for a long time and is prone to falling off and leaking again.

[0004] Therefore, a drainage pipe rotary excavation minimally invasive repair method is needed to repair the damaged pipes under the road and overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present application is to provide a method for repairing a minimally invasive incision in a drainage pipe, which has the advantages of improving the softened foundation at the blockage location, sealing and reinforcing the pipe interface, and safely and stably repairing a small incision in the road surface.

[0006] This application is implemented as follows:

[0007] The present application provides a method for repairing a minimally invasive incision in a drainage pipe, which comprises the following steps:

[0008] Clear and clean the blocked parts of damaged pipes under the road surface;

[0009] Perform circular cutting on the upstream and downstream of the damaged part of the pipeline to obtain circular cutting pipe sections;

[0010] After cutting the asphalt structure downwards on the road surface, rotary excavation is carried out to the damaged part of the pipeline, and the ring-cut pipe section is taken out;

[0011] After cleaning the rotary drilling channel, install the casing and fix it;

[0012] Clean the damaged parts of the pipeline and reinforce the pipe foundation;

[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 backfilling 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 blocked.

[0018] In some optional implementation schemes, when performing ring 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 ring cutting vehicle is pushed toward the damaged pipe upstream and downstream until it cannot move, and the road surface position is determined according to the positioning device and the ring 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 and 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 road surface asphalt structure 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 according to the pile diameter to extract soil. After the ring-cut pipe section is taken out, 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 it, 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 part of the pipeline, the side walls of the collapsed area are repaired and mortar is sprayed to protect the wall. The soil in the upstream and downstream pipelines of the damaged part and the soil on the rotary excavation base are removed, so that the leakage length of the upstream and downstream pipelines of the damaged part is more than 12 cm. The upstream and downstream pipelines of the damaged part are flushed, and the mud and water in the rotary excavation base are drained.

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

[0023] In some optional embodiments, before the two ends of the inner tube are respectively inserted into the upstream and downstream pipes of the damaged pipe, a ring wire is sleeved on the outer wall of the inner tube, and the two ends of the ring wire are respectively sleeved on the outer walls of the upstream and downstream pipes of the damaged pipe and connected by glue.

[0024] In some optional embodiments, when the two ends of the inner tube are respectively inserted into the upstream and downstream pipes of the damaged pipe, glue is coated on the inner walls of the upstream and downstream pipes of the damaged pipe, and the inner tube is moved back and forth axially to connect the inner tube to the inner walls of the upstream and downstream pipes of the damaged pipe.

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

[0026] The beneficial effects of the present application are as follows: the drainage pipe rotary drilling minimally invasive repair method provided by the present application comprises the following steps: clearing and cleaning the blocked part of the damaged pipe under the road surface; performing circular cutting on the upstream and downstream of the damaged pipe to obtain circular cut pipe sections; cutting the asphalt structure downward on the road surface and rotary drilling to obtain soil to the damaged pipe, and taking out the circular cut pipe section; installing a casing to fix it after cleaning the rotary drilling channel; cleaning the damaged pipe and reinforcing the pipe base; passing an airbag through an inner pipe, inserting the two ends of the inner pipe into the upstream and downstream pipes of the damaged pipe respectively, inflating the airbag to support the outer wall of the inner pipe to fit the inner wall of the upstream and downstream pipes of the damaged pipe; pouring slow-setting soil on the collapsed area outside the damaged pipe to backfill the roadbed and restore the road surface; and taking out the airbag. The drainage pipe rotary drilling minimally invasive repair method provided in the present application is to cut the pipe in a ring after clearing and dredging the pipe, and use the rotary drilling method to remove the soaked soil and then process the pipe base, use an air bag to support the inner pipe to repair the ring-cut pipe and pour concrete and pavement repair, and finally recover the air bag, thereby solving the problems of local damage and disconnection of the drainage pipe that lead to leakage and blockage, and 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 small pavement wounds. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the flow chart of the method for repairing a minimally invasive incision in a drain pipe provided in an embodiment of the present application;

[0029] Figure 2A schematic diagram of clearing and cleaning the blocked portion of a damaged pipe under a road surface in the drainage pipe rotary excavation minimally invasive repair method provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of rotary excavation construction in the drain pipe rotary excavation minimally invasive repair method provided in an embodiment of the present application;

[0031] Figure 4 A construction schematic diagram of using an airbag to seal the annular cut pipe section in the drainage pipe rotary drilling minimally invasive repair method provided in an embodiment of the present application.

[0032] In the figure: 100, pavement; 110, pipeline; 120, ring cutting vehicle; 130, rotary drilling machine; 140, casing; 150, lifting rod; 160, protective tile; 170, rotary drilling channel; 180, leveling layer; 190, air bag; 200, inner tube; 210, ring wire; 220, main reinforcement; 230, concrete layer. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here 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 accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in 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", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The features and performance of the drainage pipe rotary excavation minimally invasive repair method of the present application are further described in detail below in conjunction with the embodiments.

[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the embodiment of the present application provides a method for repairing a minimally invasive incision of a drain pipe by rotary drilling, which comprises the following steps:

[0042] Step 1, clear and clean the blocked part of the damaged pipe 110 under the road surface 100; use a cleaning hook to hook out and remove the blockage in the blocked part of the damaged pipe 110, use a drill rod to drill through the blocked part, drain the water in the pipe 110 and seal the water inlet of the well chamber upstream of the pipe 110, clean the blocked part of the damaged pipe 110 until there is no floc-like blockage, and use a shovel to clean the pipe 110 and seal the soil in the pipe 110.

[0043] Step 2: Perform ring cutting on the upstream and downstream of the damaged part of the pipe 110 to obtain the ring cutting pipe section; flush the inner wall of the pipe 110 with water from the upstream of the damaged part of the pipe 110, and after the flushing water flows out of the drill hole of the drill rod, push the ring cutting vehicle 120 toward the damaged part of the pipe 110 upstream and downstream until it cannot move, determine the position of the road surface 100 according to the positioning device provided on the ring cutting vehicle 120 and match the ring cutting position with the settlement area of ​​the road surface 100, and when the size error of the ring cutting position matching the settlement area of ​​the road surface 100 is ≤2m, cut the pipe 110 to obtain the ring cutting pipe section.

[0044] Step 3: After cutting the asphalt structure of the pavement 100 downward, use the rotary drilling machine 130 to rotary drill the rotary excavation channel 170 to take soil to the damaged part of the pipeline 110, and take out the ring-cut pipe section; arrange the grid lines with the connecting line of the ring-cut pipe section as the center line, determine the minimum repair diameter according to the grid lines and the settlement area of ​​the pavement 100, cut and break the asphalt structure of the pavement 100 along the determined grid line area and the minimum repair diameter, and then use the rotary drilling rig to rotary excavate and take soil according to the pile diameter until the ring-cut pipe section is rotary excavated and taken out, continue rotary excavation until all the soft soil soaked by water is taken out, and continue rotary excavation to a depth of more than 20 cm below the original soil base surface; the minimum repair diameter is ≥0.8m; the diameter of the rotary excavation channel 170 in this embodiment is ≥800mm.

[0045] Step 4: After cleaning the rotary drilling hole 170, install and fix the casing 140; clean the loose soil on the side wall of the rotary drilling hole 170, select a suitable casing 140 according to the depth of the side wall of the rotary drilling hole 170, and install a fixed lifting rod 150 on the top of the casing 140 for hanging and fixing, manually enter the bottom of the rotary drilling hole 170 to seal the gap between the rotary drilling hole 170 and the casing 140 with mortar, and install fan-shaped protective tiles 160 on the pipeline working surface at the bottom of the casing 140. In this embodiment, the lifting rods 150 are arranged in 3-6 groups at intervals along the circumference of the casing 140, and the lifting rods 150 and the casing 140 are connected by bolts or pins; the protective tiles 160 are connected to the casing 140 by self-tapping screws; the angle between the protective tiles 160 and the busbar of the casing 140 is 120-150 degrees, the length of the protective tiles 160 is 30-50 cm, the fan-shaped width at the root of the protective tiles 160 is 15-20 cm, and the fan-shaped width at the end is ≥ the diameter of the casing 140.

[0046] Step 5, clean the damaged part of pipeline 110 and reinforce the pipe base; repair the side wall of the collapsed area and spray mortar to protect the wall, manually dig out and remove the soil in the upstream pipeline 110 and the downstream pipeline 110 of the damaged part of pipeline 110 and the soil in the rotary excavation base surface, so that the leakage length of the upstream pipeline 110 and the downstream pipeline 110 of the damaged part of pipeline 110 is more than 12 cm, flush the upstream pipeline 110 and the downstream pipeline 110 of the damaged part of pipeline 110, drain the mud and water in the rotary excavation base surface, and when reinforcing the pipe base, lay a 10-20 cm thick crushed stone layer and a 10-15 cm thick gravel layer to the bottom of the rotary excavation base surface in turn, and use an excavator flat plate to compact and level it to obtain a flat leveling layer 180.

[0047] Step 6: Inflate the cylindrical airbag 190 to 40%-60% of the volume of the airbag, and then pass it through the inner tube 200. Connect the main ribs 220 arranged at intervals along the circumferential direction to the outer wall of the ring wire 210, sleeve 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 airbag 190, apply a fixing glue on the ring wire 210 to bond and fix it to the outer wall of the inner tube 200, and use a film to wrap and reinforce the place where the fixing glue is applied on the ring wire 210 to form an airbag body, move the airbag body through the pipeline 110 from the downstream of the damaged part of the pipeline 110 to the upstream of the damaged part of the pipeline 110 to the ring-cut pipe section, manually enter the rotary drilling hole to untie the film and fix the ring wire 210 The two ends are respectively sleeved on the outer walls of the upstream pipe 110 and the downstream pipe 110 of the damaged part of the pipe 110 and connected by glue, and the two ends of the inner tube 200 are respectively inserted into the upstream pipe 110 and the downstream pipe 110 of the damaged part of the pipe 110. After the airbag 190 is inflated to be filled with 80%-90% volume of gas, the inner walls of the upstream pipe 110 and the downstream pipe 110 of the damaged part of the pipe 110 are coated with glue, and the inner tube 200 is reciprocated along the axial direction to make the inner tube 200 fully adhere to the inner walls of the upstream pipe 110 and the downstream pipe 110 of the damaged part of the pipe 110. After the airbag 190 is inflated to be filled with 98%-105% volume of gas, the pressure is stabilized.

[0048] Step seven, pour slow-setting soil on the collapsed area outside the damaged part of the pipe 110; after adjusting the position of the ring wire 210 and the main reinforcement 220, dismantle the protective tile 160 installed at the bottom of the casing 140, and start using the guide tube 170 to pour and vibrate concrete into the rotary drilling channel 170, pour and fill the collapsed hole area, fill the concrete to the base surface of the rotary drilling channel 170 to obtain a concrete layer 230, and lift the casing to the finished surface of the poured concrete.

[0049] Step eight, backfill the roadbed and restore the road surface 100; after the concrete layer 230 is poured and initially solidified, spread 10-15 cm of gravel on the surface of the concrete layer 230, then take out the casing 140, use the well-drilled roadbed soil to backfill and compact it in layers to the base surface of the water-stable layer, pour C15 concrete to fill the water-stable layer, brush the surface, and then after the water-stable layer concrete is finally solidified, apply the penetrating layer, joint waterproof layer, and bonding layer on the surface, and promptly restore the road surface 100 according to the original design road surface 100 asphalt material requirements.

[0050] Step nine, take out the airbag 190; after the road surface 100 is restored, remove the plugging material of the water inlet of the upstream well chamber of the pipeline 110, and deflate the airbag 190 while dragging it back and forth upstream and downstream to loosen the airbag 190, deflate the airbag 190 until the internal gas volume is ≦30%, and pull the airbag 190 downstream to the downstream well chamber to take it out.

[0051] The drain pipe rotary drilling minimally invasive repair method provided in the embodiment of the present application first clears the blocked part of the damaged pipe 110 under the road surface 100, then performs a ring cut on the damaged part of the pipe 110 to obtain a ring cut pipe section, and then uses a rotary drilling method to open a rotary drilling channel 170 on the ground to take out the ring cut pipe section to solve the problems of pipe 110 blockage, inability to replace the softened soil, and inability to fill the cavity densely. Then, the damaged part of the pipe 110 is cleaned and the pipe base is reinforced, the gas in the airbag 190 is inflated and passed through the inner pipe 200, and a ring wire 210 connected to the main reinforcement 220 is arranged on the outer surface of the inner pipe 200 to form an airbag body, and the airbag body is moved to the ring cut pipe section to connect the upstream pipe 110 of the damaged pipe 110 and the downstream pipe 110 of the damaged pipe 110 to solve the existing repair The repair method solves the problems of lining misalignment and pollution prevention, poor sealing and connectivity of the repair interface, large open excavation repair wound and long traffic time. Finally, slow-setting soil is poured in the collapsed area outside the damaged part of pipeline 110, the roadbed is backfilled, and the road surface 100 is restored and the air bag 190 is recovered. It can improve the leakage and softened foundation at the blocked position, seal and reinforce the pipeline 110 interface, and safely and stably repair the small wound on the road surface 100, ensuring the repair quality of pipeline 110. This method is designed for the repair construction of pipe sections with a diameter of ≤2m, which effectively solves the problems encountered in the repair construction, removes the soft soil layer, improves the construction efficiency of excavation and soil extraction, reduces the cost of short-term repair measures, saves costs, standardizes construction methods, and ensures the quality of repair, structural stability, and construction safety.

[0052] Among them, using rotary drilling after ring cutting to remove the blocked and damaged ring cutting pipe section can make good use of the pulling force of rotary drilling to loosen the pipe mouth, so that the soft soil layer rotates and gathers to the rotary drilling hole, effectively forming a collapsed hole cavity, and ensuring manual assistance in the construction process of the airbag body; using casing 140 to support the rotary drilling hole can effectively ensure the safety of foundation pit construction; installing protective tiles 160 on the casing 140 and repairing and spraying mortar on the side of the collapsed hole cavity can effectively ensure the safety of manual entry into the rotary drilling hole for auxiliary operations, avoid operating tools from colliding with the side wall of the collapsed hole cavity, and ensure construction quality and collapse risks. Using gravel, sand, and crushed stone as a leveling layer 180 to compact the foundation and replace the filling can greatly reduce the impact of mud on pouring concrete. The use of an air bag to support the inner tube 200 and the use of a ring wire 210 connected to the main reinforcement 220 on the outer sleeve of the inner tube 200 can well ensure the stability and operability of the inner tube 200 structure passing through the pipeline. By using the inner tube 200 to repair the ring-cut pipe section, not only can the misalignment of the pipe end be reduced, but also the tightness of the connection with the concrete can be ensured, and the smooth detachment of the air bag can be ensured. By setting the air bag, it can not only play the role of inner village when pouring concrete, but also can adapt to the smooth connection when the pipe head is deformed, and further ensure the smooth connection of the pipeline. The use of the ring wire 210 and the main reinforcement 220 can effectively tighten the inner tube 200 and the air bag, avoiding the use of other measures for fixing and structural anti-detachment.

[0053] The drain pipe rotary excavation minimally invasive repair method provided in the embodiment of the present application effectively controls the key and difficult points of construction, solves various problems that may occur during construction, greatly ensures the quality of repair, the stability of the structure, and the safety of construction, and effectively solves problems such as pipe blockage, inability to replace softened soil, inability to fill cavities densely, lining misalignment and pollution prevention, poor sealing and connectivity of repair interfaces, large open excavation repair wounds and long traffic time.

[0054] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A method for repairing a minimally invasive incision in a drain pipe, characterized in that: It includes the following steps: Clear and clean the blocked parts of damaged pipes under the road surface; Performing circular cutting on the upstream and downstream of the damaged part of the pipeline to obtain circular cut pipe sections; After cutting the asphalt structure downward on the road surface, rotary digging and taking soil to the damaged part of the pipeline, and taking out the ring-cut pipe section; After cleaning the rotary drilling channel, install the casing and fix it; Clean the damaged parts of the pipeline and reinforce the pipe foundation; 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; pouring slow-setting soil on the collapsed area outside the damaged part of the pipeline; Carry out roadbed backfilling and road surface restoration construction; The balloon is removed.

2. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When clearing the blocked part of the damaged pipeline under the road surface, the blockage in the blocked part of the damaged pipeline is removed, the blocked part is drilled through with a drill rod, the water in the pipeline is discharged and the water inlet of the well chamber upstream of the pipeline is blocked.

3. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When performing ring cutting on the upstream and downstream of the damaged pipe respectively, the inner wall of the pipe is flushed with water from the upstream of the damaged pipe, and then the ring cutting vehicle is pushed toward the damaged pipe upstream and downstream until it cannot move, and the road surface position is determined according to the positioning device and the ring cutting position is matched with the road surface settlement area before cutting the pipe.

4. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: After the asphalt structure of the road surface is cut downwards, when rotary excavation is performed to obtain soil 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 road surface asphalt structure 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 excavate soil according to the pile diameter. After taking out the ring-cut pipe section, rotary excavation is continued to a depth of more than 20 cm below the original soil base surface.

5. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When installing and fixing the casing after cleaning the rotary drilling channel, a fixed lifting 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.

6. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When cleaning the damaged part of the pipeline, repair the side wall of the collapsed area and spray mortar to protect the wall. Remove the soil in the upstream and downstream pipelines of the damaged pipeline and the soil on the rotary excavation base surface, so that the leakage length of the upstream and downstream pipelines of the damaged pipeline is more than 12 cm. Flush the upstream and downstream pipelines of the damaged pipeline, and drain the mud and water in the rotary excavation base surface.

7. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When reinforcing the pipe foundation, a crushed stone layer and a sand and gravel layer are laid on the bottom of the rotary drilling base surface in sequence and compacted and leveled.

8. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: Before inserting the two ends of the inner tube into the upstream and downstream pipes of the damaged pipe 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 and downstream pipes of the damaged pipe respectively and connected by glue.

9. The method for repairing a minimally invasive incision in a drain pipe according to claim 1, characterized in that: When the two ends of the inner tube are respectively inserted into the upstream and downstream pipes of the damaged pipe, adhesive is coated on the inner walls of the upstream and downstream pipes of the damaged pipe, and the inner tube is reciprocated along the axial direction to connect the inner tube with the inner walls of the upstream and downstream pipes of the damaged pipe.

10. The method for repairing a minimally invasive incision in a drain pipe according to claim 8, characterized in that: Before the ring wire is sleeved on the outer wall of the inner tube, a plurality of main reinforcements are connected to the outer wall of the ring wire.

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