CN119532553A - A method for in-situ repair of underground pipeline and composite lining - Google Patents
A method for in-situ repair of underground pipeline and composite lining Download PDFInfo
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Abstract
本发明提供一种地下管道原位修复的方法及复合内衬。所述方法具体包括如下步骤：在待修复的管道内壁刮涂聚脲材料构筑第一聚脲内衬层；再将浸润有相同聚脲材料的增韧材料片的一面贴合在第一聚脲内衬层上形成增韧层；然后在增韧材料片的另一面继续刮涂相同的聚脲材料构筑第二聚脲内衬层；最终固化后在待修复管道内形成由管道内壁向管中心的第一聚脲内衬层‑增韧层‑第二聚脲内衬层的三层复合内衬。本发明能在确保新内衬层和旧管道能紧密贴合和不显著减小管道过流断面的前提下，显著提高旧管道的承载力和抗渗性、抗腐蚀性和耐水流冲刷性，有效延长服役寿命。
The present invention provides a method for in-situ repair of underground pipelines and a composite lining. The method specifically comprises the following steps: applying polyurea material on the inner wall of the pipeline to be repaired to construct a first polyurea lining layer; then laminating one side of a toughening material sheet soaked with the same polyurea material on the first polyurea lining layer to form a toughening layer; then continuing to apply the same polyurea material on the other side of the toughening material sheet to construct a second polyurea lining layer; and finally after curing, a three-layer composite lining of the first polyurea lining layer-toughening layer-second polyurea lining layer from the inner wall of the pipeline to the center of the pipe is formed in the pipeline to be repaired. The present invention can significantly improve the bearing capacity, impermeability, corrosion resistance and water scouring resistance of the old pipeline, and effectively extend the service life, under the premise of ensuring that the new lining layer and the old pipeline can fit tightly and not significantly reducing the flow cross-section of the pipeline.
Description
Technical Field
The invention relates to the technical field of in-situ restoration of underground pipelines, in particular to a method for in-situ restoration of an underground pipeline and a composite lining.
Background
In the long-term service process, a large number of large-diameter underground pipelines are aged, various diseases such as water leakage, cracking, corrosion thinning and the like are ubiquitous, and if the underground pipelines are not reinforced and repaired in time, a series of safety problems such as road collapse, soil settlement deformation and the like can be caused. For a pipeline (culvert) with diseases, the existing effective non-excavation repair modes are two main types, namely (1) directly inserting a new complete lining pipe into the pipeline, and (2) constructing a new complete lining layer on the inner wall of the pipeline by spraying cement mortar. Both of these two main types of repair methods can achieve the purpose of recovering the water delivery function.
The method (1) has the defects of easy shrinkage in the curing process of cement mortar, larger porosity, poor durability and water flow scouring resistance, easy secondary damage under the scouring or erosion action of fluid in the pipe, difficult guarantee of long-term repairing effect, difficult guarantee of the normal thickness of the cement mortar lining layer, easy reduction of the flow cross section of the old pipeline, and reduced flow capacity of the repaired pipeline.
The prior Chinese patent document CN102359696A discloses a lining hose for repairing an old pipeline by adopting a turnover method, and fiber materials with high mechanical property indexes in different proportions are added into the hose according to the requirement, so that the lining pipe not only plays a role of carrying a base material by resin, but also can improve the mechanical property index of the lining layer, and compared with a common lining hose, the lining hose can reduce the wall thickness of the lining hose and increase the flow rate of the repaired old pipeline. However, the adhesion between the lining hose and the old pipeline is still not tight enough, and the performances of bearing capacity, impermeability, corrosion resistance and the like are still to be further improved.
The invention aims to develop the composite lining for in-situ repair of the underground pipeline, which can ensure that a new lining layer and an old pipeline can be tightly attached and the flow cross section of the pipeline is not obviously reduced, and can obviously improve the bearing capacity, the impermeability, the corrosion resistance and the water flow scouring resistance of the old pipeline and effectively prolong the service life of the underground pipeline.
Disclosure of Invention
The invention aims to solve the technical problem of providing an in-situ repair method and a composite lining for an underground pipeline, which can obviously improve the bearing capacity, the impermeability, the corrosion resistance and the water flow scouring resistance of the old pipeline and effectively prolong the service life on the premise of ensuring that the new lining layer and the old pipeline can be closely attached and the flow cross section of the pipeline is not obviously reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for in-situ repair of an underground pipeline, which specifically comprises the following steps:
S1, constructing a first polyurea lining layer by scraping and coating a polyurea material on the inner wall of a pipeline to be repaired;
s2, attaching one surface of a toughening material sheet soaked with the same polyurea material to the first polyurea lining layer to form a toughening layer;
S3, continuously scraping the same polyurea material on the other surface of the toughening material sheet to construct a second polyurea lining layer;
S4, finally curing to form a three-layer composite lining of the first polyurea lining layer-the toughening layer-the second polyurea lining layer from the inner wall of the pipeline to the center of the pipeline in the pipeline to be repaired.
Further, the method comprises the steps of,
Step S0 is further included before step S1:
deep cleaning is carried out on the inner wall of the pipeline to be repaired, and attachments, scraps, salient points and the like on the inner wall of the old pipeline are removed, so that the inner wall of the old pipeline is kept smooth;
Pretreating the cleaned inner wall of the old pipeline, and smearing and filling large pits or cracks in the old pipeline by using quick-hardening cement;
And a layer of water-based epoxy resin primer is coated along the full section of the inner wall of the pipeline, the water-based epoxy resin coating is uniform and complete and covers the whole inner wall surface, the phenomena of sagging, salient points and the like are avoided, and the polyurea material is coated after the water-based epoxy resin primer is cured.
Further, the method comprises the steps of,
In the steps S1 and S3, the thickness of single blade coating of the polyurea material is 0.5-1 mm, the distance of single blade coating along the axial direction of the pipeline is 25-30 cm, the blade coating interval time of two adjacent layers is not more than 3 minutes, and at least 1cm of coverage is arranged at the joint, and the coverage is generally 1-2 cm.
Specifically, in the steps S1 and S3, the whole repair section is painted, and after the polyurea material is completely cured, the next painting is performed at the starting point after turning back, and the process is repeated for several times until the construction of the first polyurea lining layer or the second polyurea lining layer is completed.
Further, the method comprises the steps of,
The thickness of the first layer polyurea liner is half of the total design thickness of the composite liner.
Further, the method comprises the steps of,
The concrete process of the step S2 comprises the steps of uniformly soaking the pre-prepared toughening material sheets in a polyurea material, attaching one surface of the pre-prepared toughening material sheets to a first layer of polyurea lining layer in a pipeline, attaching a first toughening material sheet at the upper half part and a second toughening material sheet at the lower half part when attaching the toughening material sheets, wherein the overlapping positions of the toughening material sheets of the first toughening material sheet and the second toughening material sheet are positioned at two side edges of the pipeline, the overlapping length is 1-2 cm, the axial dimension of the toughening material sheets is 50-80 cm, the overlapping length of the adjacent toughening material sheets is 1-2 cm, and the overlapping positions of the adjacent toughening material sheets cannot be positioned at a faucet.
Further, the folds on the laminated toughening material sheet are smoothed, so that the polyurea on the toughening material sheet is integrally laminated on the first polyurea lining layer after being solidified to form a toughening layer.
Further, the method comprises the steps of,
The toughening material sheet in step S2 includes, but is not limited to, sheet-like toughening materials of other materials such as glass fiber cloth, metal mesh, glass fiber cloth, carbon fiber cloth, etc.
Further, the glass fiber cloth is a single-layer mesh cloth woven by alkali-free glass fibers, the thickness is 1mm, and the mesh size is 4-5 mm.
The polyurea material comprises, by weight, 31-55 parts of isocyanate, 45-69 parts of polyol and 2-10 parts of silane coupling agent, and the component B comprises, by weight, 40-80 parts of polyaspartic acid ester resin, 2-5 parts of defoamer, 1-6 parts of flatting agent, 1-5 parts of antioxidant and 40-65 parts of pigment and filler, wherein the mass ratio of the component A to the component B is 2:1-1:1 when the polyurea material is used.
Preferably, the isocyanate is at least one of toluene diisocyanate trimer and hexamethylene diisocyanate trimer.
Preferably, the polyol is at least one of polyoxypropylene ether glycol and polyoxypropylene ether triol with molecular weights of 1000, 2000 and 3000 respectively.
Preferably, the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane (KH-550), gamma-glycidoxypropyl trimethoxysilane (KH-560), N- (beta-aminoethyl) -gamma-aminopropyl triethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane, bis (3-trimethoxysilylpropyl) amine.
Preferably, the polyaspartic acid ester resin is at least one selected from the group consisting of polyaspartic acid ester resin Desmophen NH 1420, polyaspartic acid ester resin Desmophen NH 1520, polyaspartic acid ester resin Desmophen NH 1220, polyaspartic acid ester resin F420, polyaspartic acid ester resin F520 and polyaspartic acid ester resin F220.
The polyaspartic ester resins of the above types are all selected from commercially known products of the corresponding types of the Kox company.
Preferably, the defoamer is at least one of BYK-065 (Basv chemical Co., ltd.), BYK-A535 (Basv chemical Co., ltd.), court-6800 (court of Shanghai chemical Co., ltd.), foamStar ST2410AC (Basv chemical Co., ltd.), and the like.
The defoamers of the above models are all commercially known products of corresponding manufacturers, wherein the chemical compositions of BYK-065 and BYK-A535 are foam breaking polysiloxane solutions, the main component of the model-6800 is a polysiloxane mixture containing hydrophobic particles, and FomaStartST2410AC is a novel mineral oil-based compound.
Preferably, the leveling agent is at least one of BYK-350 (Pick chemical company, germany), BYK-356 (Pick chemical company, germany), BYK-361 (Pick chemical company, germany), and the like.
The leveling agents of the above models are all commercially known products of corresponding manufacturers, and the main chemical components of the leveling agents are polyacrylate.
Preferably, the antioxidant is at least one of commercial antioxidant 1076 (basf chemical company, ltd.), antioxidant 1098 (basf chemical company, ltd.), antioxidant 1330 (basf chemical company, ltd.), and the like.
The antioxidants of the above types are all commercially known products of corresponding manufacturers.
Preferably, the pigment and filler is at least one of rutile type titanium dioxide, carbon black, 400-mesh talcum powder, 1250-mesh heavy calcium powder and 1250-mesh wollastonite powder.
Further, the pipeline to be repaired is a large-pipe-diameter underground drainage pipeline with the inner diameter of more than 800 mm.
Further, the method comprises the steps of,
And step S4, curing the finished composite lining for 4 hours under natural conditions, and recovering the normal use, wherein the best repairing effect can be achieved after 72 hours.
Further, the method comprises the steps of,
In combination with actual demands, lining repair layers formed by alternately combining multiple layers of polyurea and multiple layers of toughening material sheets can be constructed in the pipeline in the same way.
Further, the polyurea material can be applied by manual or mechanical brushing (e.g., high pressure airless spraying).
In a second aspect, the invention also provides a composite liner obtained by the method, which comprises a first polyurea liner layer, a toughening layer and a second polyurea liner layer, wherein the first polyurea liner layer, the toughening layer and the second polyurea liner layer are formed in a pipeline to be repaired from the inner wall of the pipeline to the center of the pipeline.
Further, the composite lining is a multi-layer structure with alternately combined multi-layer toughening layers and second polyurea lining layers.
The invention has the beneficial effects that:
1. The in-situ trenchless repairing method provided by the invention can be used for reinforcing and repairing large-diameter pipelines. The composite lining constructed by the invention has good mechanical properties, excellent impermeability, corrosion resistance and water flow scouring resistance, can improve the durability and bearing capacity of the repaired pipeline, and prolongs the service life of the pipeline.
The polyurea material used for constructing the first and second polyurea inner liners is a double-component system, A, B components are accurately weighed and uniformly stirred to be used, the operation is simple and convenient, the interface bonding strength of the polyurea material layer and concrete is not lower than 3.0MPa, the adhesive force retention rate in a long-time water immersion environment is more than 80%, the gel time of the polyurea material is 20-40 minutes, the surface drying is carried out for 1-2 hours, the influence of environmental humidity is small, the coating is compact and smooth, the resistance of liquid circulation can be reduced, the tensile strength is not lower than 30MPa, the polyurea material is waterproof under the water pressure of 0.4MPa, and the polyurea material is not degraded under the acid corrosion environment.
2. The composite lining constructed by the invention has excellent mechanical property, is tightly attached to the inner wall of the old pipeline, forms a composite bearing structure with smooth surface, and greatly improves the bearing capacity of the old pipeline.
3. The composite lining constructed by the invention has small design thickness, small influence on the reduction of area of the old pipeline and no obvious reduction of the overflow capacity of the old pipeline.
Drawings
In order to more clearly illustrate the embodiments or technical gist of the present invention, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in the drawings without inventive effort for other persons skilled in the art.
Fig. 1 is a schematic flow chart of an in-situ trenchless rehabilitation method provided by the invention.
Fig. 2 is a schematic radial sectional view of a composite repair liner according to the present invention.
Fig. 3 is a schematic radial cross-sectional view of a pipe according to the method for bonding a sheet of toughening material (glass fiber cloth) provided by the present invention.
Fig. 4 is a schematic diagram of a fitting method of axially adjacent sections of a pipe according to the present invention.
Fig. 5 is a graph comparing the results of the concrete pipe load bearing capacity test before and after repair according to the embodiment of the invention.
The reference numerals indicate 1-aqueous epoxy resin coating, 2-first polyurea lining layer, 3-toughening layer, 301-first toughening material sheet, 302-second toughening material sheet, 303-lap joint, 4-second polyurea lining layer and 5-pipeline to be repaired.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The technical gist and aspects of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that all directional indicators (such as up, down, front, rear, left, right, inside, outside, etc.) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include at least one such feature, either explicitly or implicitly. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The following examples were conducted under conventional conditions or conditions recommended by the manufacturer, without specifying the specific conditions. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
As shown in fig. 1-4, the invention provides a method for in-situ repairing an underground pipeline, which specifically comprises the following steps:
S0, deeply cleaning the inner wall of the pipeline (culvert) to be repaired, and removing attachments, scraps, salient points and the like on the inner wall of the old pipeline to enable the inner wall of the old pipeline to be kept smooth;
Pretreating the cleaned inner wall of the old pipeline, and smearing and filling large pits or cracks in the old pipeline by using quick-hardening cement;
And a layer of water-based epoxy resin primer is coated on the full section of the inner wall of the pipeline to form a water-based epoxy resin coating 1, the water-based epoxy resin coating 1 is uniform and complete and covers the whole inner wall surface without sagging, protruding points and the like, and the polyurea material is coated after the water-based epoxy resin primer is cured.
S1, scraping polyurea materials on the inner wall of a pipeline to be repaired to construct a first polyurea lining layer 2.
And S2, attaching one surface of the toughening material sheet soaked with the same polyurea material to the first polyurea lining layer 2 to form a toughening layer 3. As a preferred embodiment, the specific procedure is as follows:
Uniformly soaking a pre-prepared toughening material sheet into a polyurea material, attaching one surface of the toughening material sheet to a first layer of polyurea lining layer 1 in a pipeline, attaching the first toughening material sheet 301 (an upper semicircular part) and then attaching a second toughening material sheet 302 (a lower semicircular part) when attaching the toughening material sheet, wherein the lap joint 303 of the toughening material sheet of the first toughening material sheet 301 (the upper semicircular part) and the toughening material sheet of the second toughening material sheet 302 (the lower semicircular part) is positioned at two side edges of the pipeline (culvert), the lap joint length is generally controlled to be 1-2 cm, the lap joint length of the upper and lower semicircular toughening material sheets in the embodiment is generally controlled to be 1cm, the axial dimension of the toughening material sheet is generally controlled to be 50-80 cm, the axial dimension of the adjacent toughening material sheet is generally controlled to be 1-2 cm, the lap joint length of the adjacent toughening material sheet in the embodiment is 1cm, and the lap joint 303 of the adjacent toughening material sheet is not positioned at a bell socket.
And trowelling the folds on the laminated toughening material sheet, so that the polyurea on the toughening material sheet is integrally laminated on the first polyurea lining layer 1 after being solidified to form the toughening layer 3.
As shown in fig. 4, if multiple sections are involved, multiple pieces of the first toughening material 301 (upper semicircular portion) and the second toughening material 302 (lower semicircular portion) are used in multiple sections in the pipe axial direction to overlap in the pipe axial direction. Likewise, the overlap length is typically 1-2cm, with this example being controlled at 1cm.
The toughening material sheet of the invention comprises but is not limited to sheet toughening materials of other materials such as glass fiber cloth, metal mesh, glass fiber cloth, carbon fiber cloth and the like. In this example, a glass fiber cloth, which is a single-layer mesh cloth woven from alkali-free glass fibers, has a thickness of 1mm and a mesh size of 5mm, is described as an example.
S3, continuously scraping the same polyurea material on the other surface of the toughening material sheet to construct a second polyurea lining layer 4;
s4, finally curing to form a three-layer composite lining of the first polyurea lining layer 2, the toughening layer 3 and the second polyurea lining layer 4 from the inner wall of the pipeline to the center of the pipeline in the pipeline to be repaired.
In the steps S1 and S3 of the preferred embodiment, the thickness of the polyurea material is about 0.5mm, the single-pass scraping distance along the axial direction of the pipeline is 25-30 cm, the scraping interval time between two adjacent layers is not more than 3 minutes, and at least 1cm of coverage exists at the joint. The total thickness of the composite liner was about 3mm.
Specifically, in the steps S1 and S3, the whole repair section is painted, and after the polyurea material is completely cured, the next painting is performed at the starting point after turning back, and the process is repeated for several times until the construction of the first polyurea lining layer or the second polyurea lining layer is completed. The polyurea material can be applied by manual or mechanical brushing (e.g., high pressure airless spray).
The thickness of the first layer polyurea liner is half of the total design thickness of the composite liner.
The polyurea material used in the embodiment comprises a component A and a component B, wherein the component A comprises, by weight, 31-55 parts of isocyanate, 45-69 parts of polyol and 2-10 parts of silane coupling agent, the component B comprises, by weight, 40-80 parts of polyaspartic acid ester resin, 2-5 parts of defoamer, 1-6 parts of flatting agent, 1-5 parts of antioxidant and 40-65 parts of pigment and filler, and when the polyurea material is used, the mass ratio of the component A to the component B is 2:1-1:1.
The embodiment more specifically provides a polyurea material for constructing and forming a polyurea lining layer 2 and a polyurea protective layer 4 and a preparation method thereof, wherein the polyurea material comprises an A component and a B component. Wherein,
The component A comprises the following raw materials by weight of 36 parts of hexamethylene diisocyanate trimer, 62 parts of polyoxypropylene ether glycol with molecular weight of 2000 and 2 parts of gamma-glycidyl ether oxypropyl trimethoxy silane. The preparation method of the component A comprises the steps of weighing the parts by weight of polyoxypropylene ether glycol, adding the parts by weight of polyoxypropylene ether glycol into a reaction kettle, stirring and heating to 110 ℃, vacuumizing to-0.1 MPa by a vacuum pump, dehydrating and removing water in raw materials until the water content of the raw materials is reduced to below five parts per million, cooling the liquid to 55 ℃, weighing the parts by weight of hexamethylene diisocyanate trimer, adding the parts by weight of hexamethylene diisocyanate trimer into the reaction kettle, stirring and dispersing for 0.5 hour, slowly heating to 85 ℃ for reacting for 2 hours, detecting the NCO value by a di-n-butylamine titration method, weighing the parts by weight of gamma-glycidoxypropyl trimethoxysilane, adding the gamma-glycidoxypropyl trimethoxysilane into the reaction kettle after the NCO value reaches 100% of a design value, preserving heat for 0.5 hour, cooling the liquid to 55 ℃, and discharging to obtain the component A material. The NCO value in the scheme is the theoretical NCO value calculated by the formulation design.
The component B comprises the following raw materials, by weight, 62 parts of polyaspartic acid ester resin F420, 1 part of antioxidant 1076 (Basoff chemical Co., ltd.), 1 part of defoamer 6800 (Demodesty chemical Co., ltd.), 1 part of flatting agent BYK-356 (German Pick chemical Co.), 35 parts of pigment and filler, wherein the pigment and filler consists of 1 part of white pulp (rutile type titanium pigment), 0.2 part of black pulp (carbon black), 20 parts of 400-mesh talcum powder, 7 parts of 1250-mesh heavy calcium carbonate and 6.8 parts of 1250-mesh wollastonite powder. The preparation method of the component B comprises the steps of weighing the polyaspartic acid ester resin F420 and the antioxidant 1076 in parts by weight, adding the polyaspartic acid ester resin F420 and the antioxidant 1076 into a vacuum stirring kettle, starting stirring, heating liquid to 110 ℃, adding pigment and filler into the vacuum stirring kettle, stirring for 0.5 hour, maintaining 110 ℃, vacuumizing to-0.1 MPa by a vacuum pump, dehydrating and removing water in the raw materials until the water content of the raw materials is reduced to below five parts per million, adding the defoaming agent 6800 and the flatting agent BYK-356, stirring for 0.5 hour, cooling to 55 ℃, and discharging to obtain the component B material.
When the embodiment is used, the mass ratio of the component A to the component B is 2:1.
The repairing method of the embodiment further comprises the step of standing and maintaining the finished composite lining for at least 4 hours at room temperature, and the repairing effect is optimal after 72 hours.
The repair method provided by the embodiment can also be combined with actual demands, and the lining repair layer formed by alternately combining multiple layers of polyurea and multiple layers of glass fiber cloth can be constructed in the pipeline in the same mode.
As shown in fig. 2, the composite lining for non-excavation in-situ repair of the underground pipeline, which can be obtained by the repair method, comprises a first polyurea lining layer, a toughening layer and a second polyurea lining layer which are formed in the pipeline to be repaired from the inner wall of the pipeline to the center of the pipeline. The composite lining with a multilayer structure in which a plurality of toughening layers and a second polyurea lining layer are alternately combined can be obtained according to actual needs.
The pipeline performance of the polyurea-glass fiber cloth composite lining obtained by the embodiment of the invention before and after repair is tested, and the results are recorded, and the test results of the bearing capacity of the concrete pipeline before and after repair are shown in figure 5. The prepared lining layer is smooth and compact in appearance, is tightly attached to the inner wall of a pipeline, is watertight after 2 hours under the action of water pressure of 0.4MPa, and has the maximum bearing capacity of 78 percent.
The polyurea material is a double-component system, active groups of the component A are isocyanate groups, active groups of the component B are amino groups, urea groups are generated after the two groups are mixed and reacted, the molecular chain segment has high cohesive energy, excellent mechanical properties can be given to the material, in addition, the system contains a large number of flexible chain segments, excellent flexibility can be given to the material, and finally, the isocyanate and amino groups have strong reaction selectivity and are not influenced by moisture, and a spraying process is adopted, so that the formed coating is more compact. And A, B components are accurately weighed and then uniformly stirred for use, and the operation is simple and convenient. Tests prove that the interface bonding strength of the polyurea layer formed by the polyurea material and the concrete is not lower than 3.0MPa, the adhesive force retention rate in a long-time soaking environment is more than 80%, the gel time of the polyurea material is 20-40 minutes, the surface drying time is 1-2 hours, the polyurea material is little influenced by environmental humidity, the coating is compact and smooth and is free of cracks when being bent, the resistance of liquid circulation can be reduced, the tensile strength is not lower than 40MPa, the polyurea material is watertight under the water pressure of 0.4MPa, and the polyurea material is not degraded under the acid corrosion environment. The measurement of each performance parameter is measured by adopting the conventional measurement method. Therefore, the method can better resist the seepage or corrosion of rain and sewage in practical application, so that the formed polyurea layer is smooth and flat and has good hydrophobicity, thereby being beneficial to the flow of water in the pipe, prolonging the service life of the pipe and improving the water conveying capacity.
The polyurea-glass fiber cloth composite lining and the in-situ coating repair method can solve the problems of water seepage, corrosion, no scouring resistance, poor bearing capacity and the like of the existing large-diameter drainage pipeline (culvert), and further prolong the normal service life of the large-diameter drainage pipeline (culvert).
The above description is only of a few preferred embodiments of the present invention and should not be taken as limiting the invention, but all modifications, equivalents, improvements and modifications within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The in-situ repair method for the underground pipeline is characterized by comprising the following steps of:
S1, constructing a first polyurea lining layer by scraping and coating a polyurea material on the inner wall of a pipeline to be repaired;
s2, attaching one surface of a toughening material sheet soaked with the same polyurea material to the first polyurea lining layer to form a toughening layer;
S3, continuously scraping the same polyurea material on the other surface of the toughening material sheet to construct a second polyurea lining layer;
S4, finally curing to form a three-layer composite lining of the first polyurea lining layer-the toughening layer-the second polyurea lining layer from the inner wall of the pipeline to the center of the pipeline in the pipeline to be repaired.
2. The method of in-situ repair of an underground pipeline according to claim 1, further comprising step S0 prior to step S1:
deep cleaning is carried out on the inner wall of the pipeline to be repaired, and attachments, scraps and salient points on the inner wall of the old pipeline are removed, so that the inner wall of the old pipeline is kept smooth;
Pretreating the cleaned inner wall of the old pipeline, and smearing and filling large pits or cracks in the old pipeline by using quick-hardening cement;
and coating a layer of water-based epoxy resin primer along the full section of the inner wall of the pipeline, wherein the water-based epoxy resin coating is uniform and complete, covers the whole inner wall surface and has no sagging and protruding point phenomenon, and the polyurea material is coated after the water-based epoxy resin primer is cured.
3. The method for in-situ repair of an underground pipeline according to claim 1, wherein,
In the steps S1 and S3, the single blade coating thickness of the polyurea material is 0.5-1 mm, the single blade coating distance along the axial direction of the pipeline is 25-30 cm, the blade coating interval time of two adjacent layers is not more than 3 minutes, and the joint is covered by 1-2 cm;
In the steps S1 and S3, the whole repair section is coated, the polyurea material is completely solidified, and then the next doctor-blading is carried out at the turning-back starting point, and the cycle is carried out until the construction of the first polyurea lining layer or the second polyurea lining layer is completed.
4. A method of in-situ repair of an underground pipe according to claim 3, wherein the thickness of the first polyurea inner liner is one half of the total design thickness of the composite inner liner.
5. The method for in-situ repair of an underground pipeline according to claim 1, wherein the specific process of step S2 is as follows:
Uniformly soaking a pre-prepared toughening material sheet into a polyurea material, attaching one surface of the toughening material sheet to a first layer of polyurea lining layer in a pipeline, and attaching a first toughening material sheet of an upper half part and a second toughening material sheet of a lower half part when attaching the toughening material sheet, wherein the overlap joint of the toughening material sheets of the first toughening material sheet and the second toughening material sheet is positioned at two side edges of the pipeline, the overlap joint length is 1-2 cm, the axial dimension of the toughening material sheet is 50-80 cm, the overlap joint length of adjacent toughening material sheets is 1-2 cm, and the overlap joint of adjacent toughening material sheets cannot be positioned at a bell and spigot;
And trowelling the folds on the laminated toughening material sheet, so that the polyurea on the toughening material sheet is integrally laminated on the first polyurea lining layer after being solidified to form a toughening layer.
6. The method of in-situ repair of an underground pipe according to claim 1, wherein the sheet of toughening material in step S2 includes, but is not limited to, glass fiber cloth, metal mesh, glass fiber cloth, carbon fiber cloth.
7. The method for in-situ repair of an underground pipeline according to claim 6, wherein,
The glass fiber cloth is a single-layer mesh cloth woven by alkali-free glass fibers, the thickness is 1mm, and the mesh size is 4-5 mm.
8. The method for in-situ repair of an underground pipeline according to claim 1, wherein,
The polyurea material comprises a component A and a component B, wherein the component A comprises, by weight, 31-55 parts of isocyanate, 45-69 parts of polyol and 2-10 parts of silane coupling agent, the component B comprises, by weight, 40-80 parts of polyaspartic acid ester resin, 2-5 parts of defoamer, 1-6 parts of flatting agent, 1-5 parts of antioxidant and 40-65 parts of pigment and filler, and when the polyurea material is used, the mass ratio of the component A to the component B is 2:1-1:1.
9. A composite liner obtained by the method of any one of claims 1 to 8, wherein the composite liner comprises a first polyurea liner layer, a toughening layer and a second polyurea liner layer formed in a pipe to be repaired from the inner wall of the pipe to the center of the pipe.
10. The composite liner of claim 9 wherein the composite liner is a multi-layer structure of alternating combinations of multi-layer toughening layers and second polyurea liners.
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