阅读说明：本技术 一种大口径排水管道非开挖涂层内衬修复方法 (Method for repairing trenchless coating lining of large-diameter drainage pipeline ) 是由 李春雷 张立军 付祖俊 胡荣华 王建军 石叶 秦慧程 赵全峰 范维维 徐谦 何彪 于 2020-12-11 设计创作，主要内容包括：本发明公开了一种大口径排水管道非开挖涂层内衬修复方法。包括施工前准备、修复施工和施工质量检测；具体是：施工准备,通风检测,管道封堵,施工导排,管道疏通,判读修复点,管内注浆,接口裂缝处理,接口表面处理,涂层修复施工,封边养护,质量检查,清理现场。本发明采用高分子聚合物乳液与无机粉料构成双组份复合型防水膜涂层材料,形成高强坚韧的防水膜,既有有机材料弹性高又有无机材料耐久性好的双重优点；增设玻璃纤维网格布层,能大大提高防水膜整体的抗拉强度；采用三基层施工工艺,包括底批施工、铺设网格布和面批施工,三基层施工工艺具有修复基层牢固、覆盖结合稳定等优点。(The invention discloses a method for repairing a large-diameter drainage pipeline trenchless coating lining. The method comprises the steps of preparation before construction, repair construction and construction quality detection; the method comprises the following steps: construction preparation, ventilation detection, pipeline plugging, construction drainage guide, pipeline dredging, repair point identification, grouting in a pipe, joint crack treatment, joint surface treatment, coating repair construction, edge sealing maintenance, quality inspection and site cleaning. The invention adopts the high molecular polymer emulsion and the inorganic powder to form the double-component composite waterproof film coating material to form the high-strength tough waterproof film, which has the double advantages of high elasticity of organic materials and good durability of inorganic materials; the glass fiber gridding cloth layer is additionally arranged, so that the integral tensile strength of the waterproof film can be greatly improved; the three-base-layer construction process is adopted, and comprises bottom batch construction, grid cloth laying and surface batch construction, and has the advantages of firm repair base layer, stable coverage combination and the like.)

1. A method for repairing a large-diameter drainage pipeline trenchless coating lining comprises the following steps: preparation before construction, repair construction and construction quality detection; the method is characterized by comprising the following steps:

preparation before construction:

(1) construction preparation: carrying out construction permission preparation and construction environment arrangement before formal construction;

(2) and (3) ventilation detection: respectively erecting a blower and an exhaust fan at two inspection well mouths of the section to be repaired, continuously supplying air and ventilating to a well bottom, and detecting harmful gas by using a detector;

(3) pipeline plugging: adopting an air bag plugging method or a brick plugging method;

(4) construction and guide row: guiding the incoming water of the branch pipes related to the upstream pipeline and the construction section, and simultaneously pumping and draining the accumulated water in the pipeline to be repaired;

(5) dredging a pipeline: according to the sedimentation condition of the pipeline, dredging the pipeline by adopting a high-pressure water jet method or a manual underground clearing method;

(6) interpretation repair point: determining repair point positions and points according to CCTV detection results and personnel underground checking conditions;

repairing construction:

(7) grouting in the pipe: grouting and reinforcing the soil body around the pipe to fill the inside and gaps of the soil layer with the grout to form an anti-seepage curtain, so that the stability of the soil body is enhanced, and the soil body is prevented from losing;

(8) interface crack treatment: according to the width of the interface crack, a cement accelerator method is adopted for embedding or polyurethane is used for injecting, filling and sealing after rapid water plugging mortar is adopted for embedding;

(9) interface surface treatment: firstly, chiseling the sundries on the pipeline interface part higher than the pipe wall, and then roughening the surface of the pipe wall to be lined by using an electric grinding wheel;

(10) coating repair construction: adopting a three-base-layer construction method, including bottom batch construction, grid cloth laying and surface batch construction; adding water into the bottom batch of dry powder, stirring into thick paste, and fully batching the paste on the surface of a roughened part by using a mud plate; paving glass fiber mesh cloth after the bottom batch is dried and hardened; after the gridding cloth is laid, the waterproof membrane surface batch construction is carried out, liquid materials are poured into powder materials and stirred into mortar, the mortar is scraped on the bottom batch in three batches by using a mud plate, and the fiber gridding cloth is covered;

(11) sealing and maintaining: sealing edges of two side openings of the waterproof film lining by using solvent-free epoxy resin, and unsealing and communicating water after curing for at least 7 days under natural conditions of drying and ventilation;

and (3) construction quality detection:

(12) quality inspection: performing appearance inspection after repair by adopting CCTV detection equipment to ensure that the defect part to be repaired is completely covered; sampling and submitting on site, and detecting the mechanical property to ensure that the standard and design requirements are met;

(13) cleaning the site: and (4) plugging and removing, namely removing the construction machines, the waste materials, the construction wastes and the temporary facilities out of the construction site.

2. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 1, wherein the method comprises the following steps: in the step (3), the pipeline plugging is to plug the upstream pipe orifice of the upstream inspection well of the pipeline to be repaired by adopting bricks, and a plurality of valves are reserved on the bricks according to the upstream water inflow amount so as to facilitate drainage in the non-construction period; and a downstream pipe orifice of the downstream inspection well is sealed by an air bag.

3. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 1, wherein the method comprises the following steps: the step (5) of dredging the pipeline comprises the following steps: adopting a high-pressure water jet method, namely utilizing high-pressure water to drive a spray head with a water guide system to advance and wash, wherein the water jet angle is controlled to be 30-35 degrees; or, a professional manually goes into the well to clean the well, and high-pressure water washing is carried out after cleaning.

4. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 1, wherein the method comprises the following steps: in the step (7), the pipeline grouting adopts an in-pipe outward drilling grouting method, and the grouting ranges are 2.0m below the bottom of the pipeline, 1.5m on the left side and the right side and 1.0m on the upper part; the arrangement of the grouting holes is determined according to the pipe diameter of the pipeline, and four points are arranged when the pipe diameter is less than or equal to 1600 mm; when the pipe diameter is larger than 1600mm, five points are arranged; the arrangement distance of the longitudinal grouting holes of the pipe joints is 1.0-2.0 m; the grouting material is cement mortar, the pressure is gradually adjusted from small to large in the grouting process, the sandy soil is controlled within the range of 0.2-0.5 MPa, and the cohesive soil is controlled within the range of 0.2-0.3 MPa.

5. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 1, wherein the method comprises the following steps: during the interface crack treatment in the step (8), when the crack width is 1-3 mm, a cement accelerator method is adopted for repairing; the width of the crack is 4-10 mm, and the crack is filled and embedded by adopting rapid water plugging mortar and then is filled and sealed by polyurethane injection.

6. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 2, wherein the method comprises the following steps: and (3) removing the plug in the step (13) by adopting a water pressure balance method, firstly opening a reserved valve at the upstream brick plug to enable the water level in the repaired pipeline to rise, removing the brick plug when the water level heights in the upstream and downstream inspection wells are basically consistent, and then deflating and taking out the downstream plug air bag.

7. The method for repairing a large-caliber drainage pipeline trenchless coating liner as claimed in any one of claims 1 to 6, wherein the method comprises the following steps: the bottom batch construction, the grid cloth laying and the surface batch construction in the coating repairing construction step in the step (10) are as follows:

firstly, bottom batch construction: adding water into the bottom batch dry powder, wherein the water-cement ratio is 1: 4, continuously stirring the mixture into thick paste by using an electric stirring tool, fully coating the surface of the roughened part with mud plates, wherein the width of each mud plate is 30cm on each side of the interface, the thickness of each mud plate is not less than 2mm, and the hardening time of the bottom coating is about 5-6 h;

secondly, laying mesh cloth: laying a layer of glass fiber mesh cloth on the hardened bottom batch, wherein the circumference of the mesh cloth is lapped by more than 10cm, the mesh cloth needs to be smoothly and tightly attached to the bottom batch, the phenomena of corner warping, arching, creasing and the like cannot occur, and the mesh cloth at the top part of the pipe needs to be temporarily supported and stabilized by a wooden frame to prevent sagging and falling;

and finally, performing surface batch construction: pouring dough batch liquid material into dough batch powder material, liquid: powder 4: 5, continuously stirring the mixture into uniform mortar by using an electric stirring tool, scraping the mortar on the bottom batch by using a mud plate in three batches, and covering the fiber grids; and after the surface of the last waterproof film is dry, performing secondary scraping and tertiary scraping, wherein the thickness of the dough is not less than 4.5mm, the total thickness of the bottom batch and the dough is about 6.5mm, and two edges are made into small chamfers.

8. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 7, wherein the method comprises the following steps: the bottom batch dry powder is polymer cement-based elastic waterproof membrane bottom batch dry powder, the surface batch powder is polymer cement-based elastic waterproof membrane surface batch dry powder, and the surface batch liquid material is polymer cement-based elastic waterproof membrane surface batch emulsion.

9. The method for repairing the trenchless coating lining of the large-caliber drainage pipeline according to claim 7, wherein the method comprises the following steps: the glass fiber mesh cloth is medium-alkali plastic-coated glass fiber mesh cloth with the tensile force not lower than 1600N.

Technical Field

The invention relates to the technical field of drainage pipeline repair construction, in particular to a method for repairing a large-diameter drainage pipeline trenchless coating lining.

Background

With the rapid development of urban construction, the number of various public underground pipelines and the scale of structures are also continuously enlarged, the available underground space is smaller and smaller, especially for old urban areas which are built and have no large-scale comprehensive transformation plan, the laying difficulty of newly-built drainage pipelines is larger and larger, meanwhile, the structural defects of dislocation, leakage, corrosion and the like of the original pipelines are more serious along with the time lapse, and the corresponding treatment of the original pipelines becomes a necessary choice in the urban development process. If the traditional grooving construction method is adopted for pipeline replacement, a series of problems of long construction period, large environmental pollution, serious traffic influence, prominent safety risk and the like are faced, so that the traditional excavation repair construction is high in cost, and the trenchless repair technology is forced to be developed quickly.

Disclosure of Invention

The invention discloses a method for repairing a large-diameter drainage pipeline trenchless coating lining. The invention aims to solve the defects of leakage, corrosion, disjointing and the like of the pipeline, avoid the problems of large environmental pollution, prominent safety risk and the like caused by excavation repair construction, and provide a repair method for the pipeline without structural damage or the pipeline with potential corrosion leakage risk for protective pre-repair.

The invention is realized by the following technical scheme:

a method for repairing a large-diameter drainage pipeline trenchless coating lining comprises the following steps: preparation before construction, repair construction and construction quality detection; the method specifically comprises the following steps:

preparation before construction:

(1) construction preparation: before formal construction, the administrative examination and approval procedures of road occupation construction need to be handled, and traffic relief and construction site arrangement are carried out according to examination and approval conditions.

(2) And (3) ventilation detection: and respectively erecting a blower and an exhaust fan at two well mouths of the section to be repaired, continuously supplying air and ventilating to the well bottom, and assigning a specially-assigned person to use a detector to detect harmful gas.

(3) Pipeline plugging: in the pipe section repairing construction, safe blocking is carried out on the pipeline, and an air bag blocking method or a brick blocking method is adopted as a blocking method.

(4) Construction and guide row: and (3) guiding the incoming water of the branch pipes related to the upstream pipeline and the construction section, and simultaneously pumping and draining the accumulated water in the pipeline to be repaired.

(5) Dredging a pipeline: according to the deposition condition of the pipeline, the pipeline is dredged by adopting a high-pressure water jet method or a manual underground clearing method.

(6) Interpretation repair point: and determining the repair points and points according to CCTV (closed Circuit Television) detection results and the inspection condition of the underground well of the personnel.

Repairing construction:

(7) grouting in the pipe: and grouting and reinforcing the soil body around the pipe to fill the slurry into the soil layer and gaps to form an anti-seepage curtain, so that the stability of the soil body is enhanced, and the soil body loss is prevented.

(8) Interface crack treatment: according to the width of the interface crack, a cement accelerator method is adopted for embedding or polyurethane injection is adopted for filling and sealing after rapid water plugging mortar is adopted for embedding.

(9) Interface surface treatment: the method comprises the steps of chiseling the sundries and dirt on the joint part of the pipeline higher than the pipe wall, and then roughening the surface of the pipe wall to be lined by using an electric grinding wheel.

(10) Coating repair construction: adding water into the bottom batch of dry powder, stirring into thick paste, and fully batching the paste on the surface of a roughened part by using a mud plate; paving glass fiber mesh cloth after the bottom batch is dried and hardened; after the gridding cloth is laid, the waterproof membrane surface is constructed in batches, liquid materials are poured into powder materials and stirred into mortar, the mortar is scraped on the bottom batch in three batches by using a mud plate, and the fiber gridding cloth is covered.

(11) Sealing and maintaining: and (3) sealing edges of two side openings of the waterproof film lining by using solvent-free epoxy resin, and unsealing and introducing water after curing for at least 7 days under natural conditions of drying and ventilation.

And (3) construction quality detection:

(12) quality inspection: and (4) adopting CCTV detection equipment to perform appearance inspection after repair so as to ensure that the defect part to be repaired is completely covered. Sampling and inspecting on site, detecting the mechanical property and ensuring to meet the requirements of specification and design.

(13) Cleaning the site: and (4) plugging and removing, and removing the used construction machines, waste materials, construction wastes and temporary facilities out of the construction site after repairing.

Preferably, the pipeline plugging in the step (3) is specifically that a brick plugging is adopted at an upstream pipe orifice of an upstream inspection well of the pipeline to be repaired, and a plurality of valves are reserved on the brick plugging according to upstream water inflow so as to facilitate drainage in a non-construction period; and a downstream pipe orifice of the downstream inspection well is sealed by an air bag.

Preferably, the step (5) of dredging the pipeline specifically comprises the step of adopting a high-pressure water jet method when the deposition amount of the pipeline is not large, namely, driving a spray head with a water guide system to advance and wash by using high-pressure water, and controlling the water jet angle to be 30-35 degrees; when the deposition amount of the pipeline is large, a professional goes into the well to clean the pipeline, and high-pressure water washing is performed after the pipeline is cleaned.

Preferably, the pipeline grouting in the step (7) adopts an in-pipe outward drilling grouting method, and the grouting ranges are 2.0m below the bottom of the pipeline, 1.5m on the left side and the right side and 1.0m on the upper part of the pipeline; the arrangement of the grouting holes is determined according to the pipe diameter of the pipeline, and four points are arranged when the pipe diameter is less than or equal to 1600 mm; when the pipe diameter is larger than 1600mm, five points are arranged; the arrangement distance of the longitudinal grouting holes of the pipe joints is 1.0-2.0 m; the grouting material is cement mortar, and the mortar consistency is determined according to factors such as the leakage condition of the pipeline, the size of a gap at a water leakage position and the like. The pressure is gradually adjusted from small to large in the grouting process, the sandy soil is controlled within the range of 0.2-0.5 MPa, and the cohesive soil is controlled within the range of 0.2-0.3 MPa.

Preferably, when the interface crack is treated in the step (8), when the crack width is 1-3 mm, a cement accelerator method is adopted for repairing; the width of the crack is 4-10 mm, and the crack is filled and embedded by adopting rapid water plugging mortar and then is filled and sealed by polyurethane injection.

Preferably, the coating repair construction in the step (10) specifically comprises the following steps:

firstly, bottom batch construction: adding water into the bottom batch dry powder, wherein the water-cement ratio is 1: and 4, continuously stirring the mixture into thick paste by using a special electric stirring tool, fully coating the surface of the roughened part by using a mud plate, wherein the width of the mud plate is 30cm on each of two sides with the interface as the center, the thickness of the mud plate is not less than 2mm, and the hardening time of the bottom coating is about 5-6 h.

Secondly, laying mesh cloth: a layer of glass fiber mesh cloth is laid on a hardened bottom batch, the perimeter of the mesh cloth is lapped by more than 10cm, the mesh cloth needs to be smoothly and tightly attached to the bottom batch, the phenomena of corner warping, arching, creasing and the like cannot occur, the mesh cloth at the top of the pipe needs to be temporarily supported and stabilized by a wooden frame, and the pipe is prevented from drooping and falling.

And finally, performing surface batch construction: pouring liquid materials into the powder materials, liquid: powder 4: and 5, continuously stirring the mixture into uniform mortar by adopting a special electric stirring tool, scraping the mortar on the bottom batch by using a mud plate in three batches, and covering the fiber grids with cloth. And after the surface of the last waterproof film is dry, performing secondary scraping and tertiary scraping, wherein the thickness of the dough is not less than 4.5mm, the total thickness of the bottom batch and the dough is about 6.5mm, and two edges are made into small chamfers.

Preferably, the base material is polymer cement-based elastic waterproof membrane base (dry powder), and the surface material is polymer cement-based elastic waterproof membrane surface group A component (dry powder) and polymer cement-based elastic waterproof membrane surface group B component (emulsion).

Preferably, the glass fiber mesh cloth is medium-alkali plastic-coated glass fiber mesh cloth with the tensile force not lower than 1600N.

Preferably, the plug is removed in the step (13) by a water pressure balance method, a valve reserved at the upstream brick plug is opened to raise the water level in the repaired pipeline, when the water level heights in the upstream and downstream inspection wells are basically consistent, the brick plug is removed, and then the downstream plug air bag is deflated and taken out.

Compared with the prior art, the invention has the beneficial effects that: (1) the two-component composite waterproof film coating material formed by the high-molecular polymer emulsion and the inorganic powder can form a high-strength tough waterproof film after the two components are mixed, and the waterproof film has the double advantages of high elasticity of organic materials and good durability of inorganic materials. (2) The cement-based polymer coating has the characteristics of high-strength bonding, toughness and composite elasticity with an original body, and a layer of glass fiber gridding cloth is additionally arranged in the manufacturing process of the waterproof membrane, so that the integral tensile strength of the waterproof membrane can be greatly improved. (3) The repairing construction has the advantages of small environmental pollution, high construction speed, less resource investment, small safety risk, small loss of the water passing section, small interference to peripheral traffic, life and commercial activities and the like. (4) The cement-based polymer waterproof film coating has the characteristics of water resistance, no toxicity, no pollution, good flexibility, no joint, good integrity, high setting speed, light weight, rigidity and flexibility, alkali resistance, easiness in repairing and the like. (5) The three-base-layer construction process is adopted, and comprises bottom batch construction, grid cloth laying and surface batch construction, and has the advantages of firm repair base layer, stable coverage combination and the like.

Drawings

FIG. 1 is a flow chart of a method for repairing a large-diameter drainage pipeline trenchless coating lining of the invention.

Detailed Description

The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.

With reference to the attached drawings.

The method for repairing the trenchless coating lining of the large-caliber drainage pipeline comprises the following steps:

(1) construction preparation: before formal construction, the administrative examination and approval procedures of road occupation construction need to be handled, and traffic relief and construction site arrangement are carried out according to examination and approval conditions.

(2) And (3) ventilation detection: and (3) erecting a blower and an exhaust fan at two well mouths of a construction section respectively, continuously supplying air and ventilating to a well bottom, and assigning a specially-assigned person to continuously detect harmful gas by using a detector.

(3) Pipeline plugging: adopting brick blocks to block upstream pipe orifices of an upstream inspection well of a pipeline to be repaired, and reserving a plurality of valves on the brick blocks according to upstream water inflow so as to facilitate drainage in a non-construction period; and a downstream pipe orifice of the downstream inspection well is sealed by an air bag.

(4) Construction and guide row: and (3) guiding the incoming water of the branch pipes related to the upstream pipeline and the construction section, and simultaneously pumping and draining the accumulated water in the pipeline to be repaired.

(5) Dredging a pipeline: when the deposition amount of the pipeline is not large, a high-pressure water jet method is adopted, namely high-pressure water is utilized to drive a spray head with a water guide system to advance and wash, and the water jet angle is controlled to be 30-35 degrees; when the deposition amount of the pipeline is large, a professional goes into the well to clean the pipeline, and high-pressure water washing is performed after the pipeline is cleaned.

(6) Interpretation repair point: and determining the number and the point position of the repair points according to the CCTV detection result and the underground checking condition of personnel.

(7) Grouting in the pipe: adopting an in-pipe outward drilling grouting method, wherein the grouting range is 2.0m below the bottom of the pipeline, 1.5m on the left side and the right side and 1.0m on the upper part; the arrangement of the grouting holes is determined according to the pipe diameter of the pipeline, and four points are arranged when the pipe diameter is less than or equal to 1600 mm; when the pipe diameter is larger than 1600mm, five points are arranged; the arrangement distance of the longitudinal grouting holes of the pipe joints is 1.0-2.0 m; the grouting material is cement mortar, and the mortar consistency is determined according to factors such as the leakage condition of the pipeline, the size of a gap at a water leakage position and the like. The pressure is gradually adjusted from small to large in the grouting process, the sandy soil is controlled within the range of 0.2-0.5 MPa, and the cohesive soil is controlled within the range of 0.2-0.3 MPa.

(8) Interface crack treatment: when the width of the crack is 1-3 mm, embedding and repairing by adopting a cement accelerator method; the width of the crack is 4-10 mm, and the crack is filled and embedded by adopting rapid water plugging mortar and then is filled and sealed by polyurethane injection.

(9) Interface surface treatment: the method comprises the steps of chiseling the sundries and dirt on the joint part of the pipeline higher than the pipe wall, and then roughening the surface of the pipe wall to be lined by using an electric grinding wheel.

(10) Coating repair construction: adding water into the bottom batch of dry powder, stirring into thick paste, and fully batching the paste on the surface of a roughened part by using a mud plate; paving glass fiber mesh cloth after the bottom batch is dried and hardened; after the gridding cloth is laid, the waterproof membrane surface is constructed in batches, liquid materials are poured into powder materials and stirred into mortar, the mortar is scraped on the bottom batch in three batches by using a mud plate, and the fiber gridding cloth is covered.

Firstly, surface batch construction: adding water into the bottom batch dry powder, wherein the water-cement ratio is 1: and 4, continuously stirring the mixture into thick paste by using a special electric stirring tool, fully coating the surface of the roughened part by using a mud plate, wherein the width of the mud plate is 30cm on each of two sides with the interface as the center, the thickness of the mud plate is not less than 2mm, and the hardening time of the bottom coating is about 5-6 h.

Secondly, laying mesh cloth: a layer of glass fiber mesh cloth is laid on a hardened bottom batch, the perimeter of the mesh cloth is lapped by more than 10cm, the mesh cloth needs to be smoothly and tightly attached to the bottom batch, the phenomena of corner warping, arching, creasing and the like cannot occur, the mesh cloth at the top of the pipe needs to be temporarily supported and stabilized by a wooden frame, and the pipe is prevented from drooping and falling.

And finally, performing surface batch construction: pouring liquid materials into the powder materials, liquid: powder 4: and 5, continuously stirring the mixture into uniform mortar by adopting a special electric stirring tool, scraping the mortar on the bottom batch by using a mud plate in three batches, and covering the fiber grids with cloth. And after the surface of the last waterproof film is dry, performing secondary scraping and tertiary scraping, wherein the thickness of the dough is not less than 4.5mm, the total thickness of the bottom batch and the dough is about 6.5mm, and two edges are made into small chamfers.

(11) Sealing and maintaining: and (3) sealing edges of two side openings of the waterproof film lining by using solvent-free epoxy resin, and unsealing and introducing water after curing for at least 7 days under natural conditions of drying and ventilation.

(12) Quality inspection: and (4) adopting CCTV detection equipment to perform appearance inspection after repair so as to ensure that the defect part to be repaired is completely covered. Sampling and inspecting on site, detecting the mechanical property and ensuring to meet the requirements of specification and design.

(13) Cleaning the site: and (4) plugging and removing, and removing the used construction machines, waste materials, construction wastes and temporary facilities out of the construction site after repairing.