A repair and lifting structure and method for road subsidence and damaged wellheads

Abstract

The present invention relates to the technical field of wellhead repair construction for municipal engineering, and specifically to a repair and lifting structure and method for road settlement and damaged wellheads. The present invention realizes the wellhead reinforcement and repair of road settlement and damaged wellheads in a non-relocation type of pipeline network, changes the previous repair method using rigid structures, realizes the wellhead repair of the original semi-rigid pavement and flexible pavement, ensures the quality after repair and the integrity and stability of the structure, greatly improves the bearing capacity of the wellhead, and has strong continuity and convenient measurement in the repair steps, effectively solving the problems of large impact of repair on traffic, long traffic time affected by the maintenance of the repair structure, poor durability of the repair structure and integrity of the surface layer, time-consuming and labor-intensive, and high repair cost. It is specially designed for the wellhead repair construction of semi-rigid pavements and flexible pavements, and provides an economical, stable, green, environmentally friendly, safe and reliable method for EPC project construction.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering wellhead repair construction, and in particular to a repair and lifting structure and method for road settlement and damaged wellheads. Background Art

[0002] In the past, the construction of old urban areas in the original city set up pipelines on the roads. With the passage of time and the increasingly heavy traffic, the soil around the well chamber was squeezed, the well body showed different degrees of cracking and deformation, the well cover squeezed the well shaft, broke, sank, deformed and dislocated, and the road surface around the well mouth showed large settlement and reflected the cracks and damage of the network. The road surface was bumpy and the pit jump was extremely serious. In daily maintenance, the method of filling the road with concrete after the road was closed was often adopted, but the repair was often affected by the insufficient curing age of the concrete to open traffic, the leakage of the joints between the flexible surface layer and the rigid surface layer, and the road damage was repaired repeatedly.

[0003] At present, because the original roads are mostly densely populated areas, the drainage of the pipeline network on the road is still smooth and good. The overall relocation of the pipeline network and the reconstruction of the road by milling and planing have a long construction period and large construction investment, which has a serious impact on people's lives and a great pressure on traffic guidance, which is not conducive to the needs of economic construction. Therefore, it is urgent to find a method to achieve scientific and efficient, cost-effective repair and reduce the impact on traffic, to solve the problems of the existing technology that requires the relocation of the pipeline network for repair, the great impact of the repair on traffic, the long time of the repair structure maintenance, the poor durability of the repair structure and the integrity of the surface layer, time-consuming and labor-intensive, and high repair costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a repair and lifting structure and method for road subsidence and damaged wellheads are provided. The structure is stable and has a high bearing capacity. The repair method has strong consistency and is easy to measure. It can effectively reduce the impact of the repair process on traffic, improve repair efficiency, and reduce repair costs.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A repair and lifting structure for road subsidence and damaged wellheads, comprising a wellbore 1, a well ring 2 and a well cover 3, wherein the wellbore 1 is provided with a road base 4, a water-stabilizing layer 5, an asphalt layer lower layer 6 and an asphalt layer upper layer 7 in sequence from bottom to top;

[0007] A flexible mouth guard plate 10 is installed inside the top of the shaft 1, and the top surface of the flexible mouth guard plate 10 is flush with the bottom surface of the shaft ring 2; a steel grating plate 11 is installed outside the top of the shaft 1, and a top support rod 13 is supported between the steel grating plate 11 and the water-stable layer 5. Concrete 9 is poured between the steel grating plate 11 and the water-stable layer 5.

[0008] Furthermore, the cracks and joints on the inner wall of the shaft 1 are sealed by grouting; the cracks on the road base 4 and the surface cracks on the water-stable layer 5 are reinforced by grouting or grouting.

[0009] Furthermore, the top supporting rod 13 is composed of a screw rod 131 located in the middle and threaded clips 132 located at both ends. One end of the top supporting rod 13 is fixed in a screw hole opened on the steel grating plate 11, and the other end is inserted into the water-stabilizing layer 5, and the insertion depth does not exceed 1 / 2 of the thickness of the water-stabilizing layer 5.

[0010] Furthermore, asphalt paste is applied at the junction of the steel grating plate 11 and the water-stable layer 5 .

[0011] Furthermore, a plurality of spacers 12 are evenly spaced between the steel grating plate 11 and the outer top surface of the shaft 1 .

[0012] Furthermore, an adhesive layer 8 is sprayed between the lower layer 6 of the asphalt layer and the upper layer 7 of the asphalt layer, and a felt sealing layer is laid.

[0013] Furthermore, the steel grating plate 11 is made of galvanized steel, and the side length of the grating holes of the steel grating plate 11 is larger than the maximum particle size of the granular materials in the concrete 9 .

[0014] Furthermore, the flexible mouth guard plate 10 is specifically a plastic soft plate containing a reinforcement belt, and the lower edge of the flexible mouth guard plate 10 is fixed to the inner wall of the wellbore 1 through a gas connector.

[0015] Furthermore, the steel grating plate 11 and the well ring 2 are fixed by binding with wires, and the wires are specifically made of corrosion-resistant tungsten wire.

[0016] A method for repairing and lifting road subsidence and damaged wellheads, using the above-mentioned repair and lifting structure, specifically comprises the following steps:

[0017] S1, on-site investigation and design: measure the dimensions of the on-site road network well chamber, investigate the well chamber settlement and damage degree, and design the repair and lifting structure based on the survey results;

[0018] S2, material customization: According to the designed repair and lifting structure size, the frame size of the water-stabilizing layer structure repair surface is calculated according to the graded size, and the top bearing rod, steel grating plate and flexible mouth guard plate are customized according to the size of ≥50mm added on each side;

[0019] S3, cleaning of well wall and pipe network: cleaning of loose, cracked and semi-detached slurry on the inner wall of the wellbore, and cleaning of the bottom of the pipe network well chamber;

[0020] S4, Wellbore reinforcement: Use the plugging mud to seal and repair the cracks and leakage traces in the wellbore, and reinforce the soft gaps with grouting;

[0021] S5, measurement and layout of the wellhead repair range: According to the designed repair and lifting structure size, the edge lines around the wellhead that need to be repaired and broken are measured and laid out. The border line of the damaged repair surface should be parallel or perpendicular to the center line of the road;

[0022] S6, pavement layer cutting and breaking: temporarily close the construction area, cut and break the asphalt surface according to the border line of the damaged repair surface, and then cut and break the bottom asphalt layer and the upper water-stabilizing layer in turn according to the step width requirements, and remove the surface scum and cracks behind the break;

[0023] S7, strengthening and repairing the subbase and installing flexible baffles: grouting or grouting reinforcement is carried out on the cracks and fissures on the surface of the water-stable cement paste after the scum is removed and cleaned, micro-expansion fine powder mortar is used to grout the joints around the wellbore, and a mesh is hung on the inner wall of the wellbore, and then a flexible mouth guard is installed;

[0024] S8, Steel grating plate and mortar installation in the wellbore: Grind and clean the upper surface of the wellbore, the edge of the steps of the upper water-stabilizing layer and the surface of the top bearing rod installation on the lower water-stabilizing layer, drill holes at the top surface of the wellbore and the top bearing rod installation position of the lower water-stabilizing layer, install steel grating plates and top bearing rods, and then plaster the mesh surface on the inner wall of the wellbore to complete the mortar installation and form a new repair layer;

[0025] S9, concrete pouring and manhole cover installation: concrete is poured along the holes of the steel grating plate, and the wires for tying the manhole ring are first inserted into the grating plate. The finished surface is at 1 / 2 of the thickness of the steel grating plate. The manhole ring foot is filled with concrete and the bevel is closed. The manhole ring and manhole cover are installed. The manhole ring and the steel grating plate are fixed with wires;

[0026] S10, construction of permeable layer and asphalt lower layer: after the concrete strength reaches 25%, the permeable layer is sprayed, and asphalt paste is applied on the surrounding areas of the steel grating and the junction with the water-stabilizing layer. Then, after the permeable layer penetrates into the upper water-stabilizing layer plane and the concrete casting blocks, and the adhesive layer is applied on the cut surface of the asphalt lower layer and around the well ring, the asphalt lower layer construction is carried out.

[0027] S11, spraying of sealing layer, tack coat and construction of asphalt upper layer: spraying tack coat on the asphalt lower layer and laying the asphalt sealing layer, then spraying the tack coat on the asphalt sealing layer and constructing the asphalt upper layer.

[0028] Compared with the prior art, the present invention has the following main advantages:

[0029] 1. The present invention adopts top bearing rods and steel grid plates, which can enhance the inter-layer bite force between the asphalt layer and the concrete layer, the integrity and bearing capacity of the structure, can open traffic in advance, reduce the impact of concrete maintenance on traffic, and the road can be quickly repaired in a short time and then opened to traffic;

[0030] 2. The present invention strengthens the wellbore by reinforcing the settlement damage caused by extrusion deformation and water leakage in the early stage, thereby maximizing the stability and avoiding the risk of settlement damage in the later stage, which meets the requirements of economy, greenness and environmental protection;

[0031] 3. The present invention uses a flexible mouth guard plate and a steel grid plate to prevent the concrete under the well ring from loosening, holes, and loss, which is beneficial to the well ring and well cover elevation control and the installation of the base to prevent the well cover from deformation and displacement due to an unsolid base in the later stage;

[0032] 4. The present invention uses three-point grouting, uses simple mechanical equipment, strengthens gap treatment, enhances bonding and structural integrity, and avoids further extension of cracks and gaps;

[0033] 5. The present invention realizes the reconstruction and repair of non-hard road surface through layered step repair, enhances the bite force between structural layers, forms staggered overlap between the tarpaulin seal layer and the original structural layer, and concrete interception, so as to prevent water from invading the surrounding area of ​​the wellhead and causing damage;

[0034] 6. The structure has good integrity and can be quickly repaired and opened to traffic. It has strong bearing capacity and reduces damage caused by long concrete curing age and traffic disturbance after repair. It has good durability after repair and can be implemented in a standardized manner. At the same time, it has good metering and billing standards and advantages for similar EPC renovation projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an overall schematic diagram of the repair and lifting structure of the present invention;

[0036] Figure 2 It is a top view after the repair of the present invention;

[0037] Figure 3 is a schematic diagram of the grille of the present invention after installation;

[0038] Figure 4 A top view of the grille of the present invention after installation;

[0039] Figure 5 It is a schematic diagram of the top support rod of the present invention.

[0040] In the figure: 1, shaft; 2, shaft ring; 3, shaft cover; 4, road base; 5, water-stabilizing layer; 6, layer below asphalt layer; 7, layer above asphalt layer; 8, adhesive layer; 9, concrete; 10, flexible mouth guard plate; 11, steel grating plate; 12, cushion block; 13, top bearing rod; 131, screw rod; 132, threaded clip. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0043] 1. A repair and lifting structure for road subsidence and damaged wellheads

[0044] like Figures 1 to 5 The present invention provides a repair and lifting structure for road subsidence and damaged wellheads, comprising a wellbore 1, a well ring 2 and a well cover 3. The wellbore 1 is provided with a road base 4, a water-stabilizing layer 5, an asphalt layer lower layer 6 and an asphalt layer upper layer 7 in sequence from bottom to top.

[0045] A flexible mouth guard plate 10 is installed inside the top of the shaft 1, and the top surface of the flexible mouth guard plate 10 is flush with the bottom surface of the shaft ring 2; a steel grating plate 11 is installed outside the top of the shaft 1, and a top support rod 13 is supported between the steel grating plate 11 and the water-stable layer 5. Concrete 9 is poured between the steel grating plate 11 and the water-stable layer 5.

[0046] Furthermore, the cracks and joints on the inner wall of the shaft 1 are sealed by grouting; the cracks on the road base 4 and the surface cracks on the water-stable layer 5 are reinforced by grouting or grouting.

[0047] Furthermore, the top supporting rod 13 is composed of a screw rod 131 located in the middle and threaded clips 132 located at both ends. One end of the top supporting rod 13 is fixed in a screw hole opened on the steel grating plate 11, and the other end is inserted into the water-stabilizing layer 5, and the insertion depth does not exceed 1 / 2 of the thickness of the water-stabilizing layer 5.

[0048] Furthermore, asphalt paste is applied at the junction of the steel grating plate 11 and the water-stable layer 5 .

[0049] Furthermore, a plurality of spacers 12 are evenly spaced between the steel grating plate 11 and the outer top surface of the shaft 1 .

[0050] Furthermore, an adhesive layer 8 is sprayed between the lower layer 6 of the asphalt layer and the upper layer 7 of the asphalt layer, and a felt sealing layer is laid.

[0051] Furthermore, the steel grating plate 11 is made of galvanized steel, and the side length of the grating holes of the steel grating plate 11 is larger than the maximum particle size of the granular materials in the concrete 9 .

[0052] Furthermore, the flexible mouth guard plate 10 is specifically a plastic soft plate containing a reinforcement belt, and the lower edge of the flexible mouth guard plate 10 is fixed to the inner wall of the wellbore 1 through a gas connector.

[0053] Furthermore, the steel grating plate 11 and the well ring 2 are fixed by binding with wires, and the wires are specifically made of corrosion-resistant tungsten wire.

[0054] 2. A method for repairing and lifting road subsidence and damaged wellheads

[0055] Based on the same inventive concept, the embodiment of the present application also provides a method for repairing and lifting road subsidence and damaged wellheads, based on the above-mentioned repair and lifting structure, specifically including the following steps:

[0056] Step 1, on-site investigation and design: Conduct on-site investigation and measurement of the pipe network well chamber on the on-site road and check the well body conditions in the well, such as coordinates, the frame size of the damaged repair surface centered on the wellhead, the elevation of the intact road surface around the well chamber, the top elevation and inner diameter of the well chamber after sinking, and the degree of damage to the well body in the well. Then, carry out in-depth design based on the investigation and measurement and the inspection of the well body conditions in the well.

[0057] Step 2, material customization: according to the design of the repair surface frame division and the requirements of the step width, the size of the water-stabilizing surface layer structure repair surface frame is calculated according to the grading size, and the size of each side is increased by ≥50mm to customize the steel grating plate with a well hole in the middle; reasonably select and customize the top bearing rod according to the required length for repair, reasonably select the length and width of the flexible mouth guard plate according to the height difference and inner diameter of the top settlement of the repair well chamber, and purchase customized heavy-duty pressure-resistant manhole covers with local logos.

[0058] Step 3, cleaning the well wall and the pipe network: before the materials are in place, open the well cover and clean the loose, cracked and semi-detached slurry on the inner wall of the well. Then, clean the bottom of the pipe network well chamber. It is necessary to clean the pipe network once.

[0059] Step 4, wellbore reinforcement: Use the leak-proof mud to grout and seal and repair the cracks and leakage traces in the wellbore, and reinforce the soft gaps with grouting.

[0060] Step 5, measurement and layout of the wellhead repair range: According to the design requirements, measure and layout the edges around the wellhead that need to be repaired and broken. The border line of the damaged repair surface should be parallel or perpendicular to the center line of the road.

[0061] Step 6, cutting and breaking of road surface in layers: temporarily close the construction area, cut and break the asphalt surface according to the border line of the damaged repair surface, and then cut and break the bottom asphalt layer and the upper water-stabilizing layer in turn according to the step width requirements, remove the surface scum and cracks after the break, and classify the broken materials for transportation and recycling to the mixing yard for classified storage and utilization.

[0062] Step 7, strengthen the repair of the subbase and install the flexible baffle: grout or grout the cracks and cracks on the surface of the water-stable cement after the scum is removed, and use micro-expansion fine powder mortar to grout the joints around the wellbore. Then, hang the net on the inner wall of the wellbore, and reasonably select the width of the flexible baffle according to the distance between the wellbore top elevation and the well cover bottom elevation. The well cover bottom elevation is used as the upper edge elevation of the flexible baffle, and the lower edge of the flexible baffle is fixed to the wellbore with air gun nails. The circular docking interface of the flexible baffle is aligned with the mortise and tenon position of the well cover installed at the back.

[0063] Step 8, installation of steel grating plates and construction of mortar in the wellbore: the elevation of the bottom of the well ring is used as the elevation of the upper surface of the steel grating cover plate, and the upper surface of the wellbore, the edge of the steps of the upper water-stabilizing layer, and the surface of the top bearing rod installation on the lower water-stabilizing layer are polished and cleaned. Then, holes are drilled and cleaned at the installation positions of the top bearing rods on the top surface of the wellbore and the lower water-stabilizing layer, and the bottom of the top bearing rods are coated with anchor glue and inserted into the installation holes and the bottom nut clamps are tightened; then, the steel grating plates are installed, and the nut clamps are adjusted to fix the steel grating cover plates, and ≥4 pads are evenly distributed under the edge of the steel grating plates near the wellbore mouth. Then, the hanging mesh surface on the inner wall of the wellbore is plastered to complete the mortar construction and form a new repair layer.

[0064] Step 9, concrete pouring and manhole cover installation: concrete is poured along the holes of the steel grating plate, and the wires for tying the manhole ring are first inserted into the grating plate. The finished surface is at 1 / 2 of the thickness of the steel grating plate. The manhole ring foot is filled with concrete and the bevel is closed. Then, the manhole ring and manhole cover are installed, and the manhole ring and the steel grating plate are fixed with wires.

[0065] Step 10, construction of permeable layer and asphalt lower layer: after the strength reaches 25%, spray the permeable layer, and apply asphalt paste around the steel grid plate and the border with the water-stabilizing layer. Then, after the permeable layer penetrates into the upper water-stabilizing layer plane and the concrete casting block, and the asphalt lower layer cut surface and the surrounding of the well ring are coated with a sticky layer, the asphalt lower layer is constructed.

[0066] Step 11, construction of sealing layer, tack layer and asphalt upper layer: spray tack layer on the asphalt lower layer and lay the asphalt felt sealing layer. The tack layer should be fully sprayed on the cut surface of the asphalt upper layer and around the well ring. Then, spray the tack layer on the asphalt felt sealing layer and construct the asphalt upper layer.

[0067] Optionally, the size of the damaged repair surface border should be designed based on the border size measured on site using a three-meter ruler with the manhole cover as the center, and divided into 500mm increments. The maximum edge value in each increment is taken as the repair size.

[0068] Optionally, the width of the breaking step and the width of the breaking step of the pavement structure layer are ≥250mm.

[0069] Optionally, the steel grating plate is made of universal galvanized steel grating cover material, and the side length of the grating holes in the plate is ≥35mm, which should be one screening size larger than the maximum particle size of the aggregate in the concrete; the plate thickness should be <45mm, which is roughly determined according to the value of "wellhead repair completion surface-wellbore top surface elevation-well ring thickness". If the thickness exceeds the size, the height can be adjusted by adjusting the top support rod.

[0070] Optionally, the top supporting rod is composed of a nut clamp and a screw, both of which should be treated with rust prevention after processing. The screw is supported by HPB400 steel bars ≥Φ12. The thread drawing density at both ends should not be too large, and the thread length should meet the requirement of "double nut clamp thickness + steel grating plate thickness" plus 10 threads. The outer diameter of the brim of the nut clamp should not be less than 4 / 3 of the grille cover hole, and the entire thickness should be 2 to 4 cm. The protruding part of the nut clamp is hexagonal and thicker than 8 mm.

[0071] Optionally, the flexible mouth guard plate is a plastic soft plate containing a reinforced belt, and the width should be selected to ensure that ≥1 / 3 of the width is at the fixed end with the inner wall of the wellbore, and the plate thickness should be ≥3mm.

[0072] Optionally, the grouting mud includes cement slurry containing plugging agent for wellbore reinforcement, water glass cement slurry for repairing cracks and fissures on the surface of water-stable cement slurry, and silt cement slurry with micro-expansion agent added for the joints around the wellbore. The grouting equipment is a lightweight grouting equipment for leak repair.

[0073] Optionally, when installing the top bearing rod, the installation base should ensure that the contact surface for tightening the nut is flat; for the installation hole, the hole diameter should be 1-2mm larger than the screw, the depth should not exceed 1 / 2 of the thickness of the lower water-stabilizing layer, the suspended height of the rear end of the screw after insertion into the hole should not exceed 5mm, the insertion of the anchor glue should fill the seam completely, there should be no looseness after fixing, and the anchor force should be 20KN and cannot be pulled out.

[0074] Optionally, for the concrete pouring, C15 concrete to which an early strength agent, an accelerating setting agent, a micro-expansion agent, and a small amount of steel fiber are added is used to ensure that the concrete reaches initial setting 1 hour after pouring and the strength reaches 2.5 MPa in 4 hours.

[0075] Optionally, the binding wire is preferably made of a material such as corrosion-resistant tungsten wire.

[0076] Optionally, the sealing layer is formed by a layer of felt.

[0077] In summary:

[0078] 1. The present invention adopts top bearing rods and steel grid plates, which can enhance the inter-layer bite force between the asphalt layer and the concrete layer, the integrity and bearing capacity of the structure, can open traffic in advance, reduce the impact of concrete maintenance on traffic, and the road can be quickly repaired in a short time and then opened to traffic;

[0079] 2. The present invention strengthens the wellbore by reinforcing the settlement damage caused by extrusion deformation and water leakage in the early stage, thereby maximizing the stability and avoiding the risk of settlement damage in the later stage, which meets the requirements of economy, greenness and environmental protection;

[0080] 3. The present invention uses a flexible mouth guard plate and a steel grid plate to prevent the concrete under the well ring from loosening, holes, and loss, which is beneficial to the well ring and well cover elevation control and the installation of the base to prevent the well cover from deformation and displacement due to an unsolid base in the later stage;

[0081] 4. The present invention uses three-point grouting, uses simple mechanical equipment, strengthens gap treatment, enhances bonding and structural integrity, and avoids further extension of cracks and gaps;

[0082] 5. The present invention realizes the reconstruction and repair of non-hard road surface through layered step repair, enhances the bite force between structural layers, forms staggered overlap between the tarpaulin seal layer and the original structural layer, and concrete interception, so as to prevent water from invading the surrounding area of ​​the wellhead and causing damage;

[0083] 6. The structure has good integrity and can be quickly repaired and opened to traffic. It has strong bearing capacity and reduces damage caused by long concrete curing age and traffic disturbance after repair. It has good durability after repair and can be implemented in a standardized manner. At the same time, it has good metering and billing standards and advantages for similar EPC renovation projects.

[0084] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A repair and lifting structure for road subsidence and damaged wellheads, comprising a wellbore (1), a well ring (2) and a well cover (3), characterized in that: The shaft (1) is provided with a road base (4), a water-stabilizing layer (5), a lower layer of the asphalt layer (6) and an upper layer of the asphalt layer (7) in order from bottom to top on its exterior; A flexible mouth guard plate (10) is installed inside the upper part of the shaft (1), and the top surface of the flexible mouth guard plate (10) is flush with the bottom surface of the shaft ring (2); a steel grating plate (11) is installed outside the upper part of the shaft (1), and a top support rod (13) is supported between the steel grating plate (11) and the water-stable layer (5), and concrete (9) is poured between the steel grating plate (11) and the water-stable layer (5); The flexible mouth guard plate (10) is specifically a plastic soft plate containing a reinforcement strip, and the lower edge of the flexible mouth guard plate (10) is fixed to the inner wall of the wellbore (1) via a connecting piece.

2. A repair and lifting structure for road subsidence and damaged wellheads according to claim 1, characterized in that: The cracks and joints on the inner wall of the shaft (1) are sealed by grouting; the cracks in the road base (4) and the surface cracks in the water-stabilizing layer (5) are reinforced by grouting or grouting.

3. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: The top support rod (13) is composed of a screw rod (131) located in the middle and threaded clamps (132) located at both ends. One end of the top support rod (13) is fixed in a screw hole provided on the steel grating plate (11), and the other end is inserted into the water-stable layer (5), and the insertion depth does not exceed 1 / 2 of the thickness of the water-stable layer (5).

4. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: Asphalt ointment is applied at the junction of the steel grating plate (11) and the water-stable layer (5).

5. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: A plurality of pads (12) are evenly spaced between the steel grating plate (11) and the outer top surface of the shaft (1).

6. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: An adhesive layer (8) is sprayed between the lower layer (6) of the asphalt layer and the upper layer (7) of the asphalt layer, and a felt sealing layer is laid.

7. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: The steel grating plate (11) is made of galvanized steel, and the side length of the grating holes of the steel grating plate (11) is greater than the maximum particle size of the granular material in the concrete (9).

8. The repair and lifting structure for road subsidence and damaged wellhead according to claim 1 is characterized by: The steel grating plate (11) and the well ring (2) are fixed by binding with wires, and the wires are specifically made of corrosion-resistant tungsten wire.

9. A method for repairing and lifting road subsidence and damaged wellheads, using the repair and lifting structure according to any one of claims 1 to 8, characterized in that: The steps include: S1, on-site investigation and design: measure the dimensions of the on-site road network well chamber, investigate the well chamber settlement and damage degree, and design the repair and lifting structure based on the survey results; S2, material customization: According to the designed repair and lifting structure size, the frame size of the water-stabilizing layer structure repair surface is calculated according to the graded size, and the top bearing rod, steel grating plate and flexible mouth guard plate are customized according to the size of each side increasing by ≥50mm; S3, cleaning of well wall and pipe network: cleaning of loose, cracked and semi-detached slurry on the inner wall of the wellbore, and cleaning of the bottom of the pipe network well chamber; S4, Wellbore reinforcement: Use the plugging mud to seal and repair the cracks and leakage traces in the wellbore, and reinforce the soft gaps with grouting; S5, measurement and layout of the wellhead repair range: According to the designed repair and lifting structure size, the edge lines around the wellhead that need to be repaired and broken are measured and laid out. The border line of the damaged repair surface should be parallel or perpendicular to the center line of the road; S6, pavement layer cutting and breaking: temporarily close the construction area, cut and break the asphalt surface according to the border line of the damaged repair surface, and then cut and break the bottom asphalt layer and the upper water-stabilizing layer in turn according to the step width requirements, and remove the surface scum and cracks after breaking; S7, strengthening and repairing the subbase and installing flexible baffles: grouting or grouting reinforcement is carried out on the surface cracks and fissures of the water-stable layer after the scum is removed and cleaned, micro-expansion fine powder mortar is used to grout the joints around the wellbore, and a mesh is hung on the inner wall of the wellbore, and then a flexible mouth guard is installed; S8, Steel grating plate and mortar installation in the wellbore: Grind and clean the upper surface of the wellbore, the edge of the steps of the upper water-stabilizing layer and the surface of the top bearing rod installation on the lower water-stabilizing layer, drill holes at the top surface of the wellbore and the top bearing rod installation position of the lower water-stabilizing layer, install steel grating plates and top bearing rods, and then plaster the mesh surface on the inner wall of the wellbore to complete the mortar installation and form a new repair layer; S9, concrete pouring and manhole cover installation: concrete is poured along the holes of the steel grating plate, and the wires for tying the manhole ring are first inserted into the grating plate. The finished surface is at 1 / 2 of the thickness of the steel grating plate. The manhole ring foot is filled with concrete and the bevel is closed. The manhole ring and manhole cover are installed. The manhole ring and the steel grating plate are fixed with wires; S10, construction of permeable layer and asphalt lower layer: after the concrete strength reaches 25%, spray the permeable layer, apply asphalt paste around the steel grid plate and the border with the water-stabilizing layer, and then wait for the permeable layer to penetrate into the upper water-stabilizing layer plane and concrete casting blocks, and apply the adhesive layer on the cut surface of the asphalt lower layer and around the well ring, and then carry out the asphalt lower layer construction; S11, spraying of sealing layer, tack coat and construction of asphalt upper layer: spraying tack coat on the asphalt lower layer and laying the asphalt sealing layer, then spraying the tack coat on the asphalt sealing layer and constructing the asphalt upper layer.

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