CN112283467A - Polyurethane spraying outer protective pipe spraying integrally formed insulation pipe on-site joint coating installation method - Google Patents
Polyurethane spraying outer protective pipe spraying integrally formed insulation pipe on-site joint coating installation method Download PDFInfo
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- CN112283467A CN112283467A CN202011139695.3A CN202011139695A CN112283467A CN 112283467 A CN112283467 A CN 112283467A CN 202011139695 A CN202011139695 A CN 202011139695A CN 112283467 A CN112283467 A CN 112283467A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 66
- 239000004814 polyurethane Substances 0.000 title claims abstract description 66
- 238000005507 spraying Methods 0.000 title claims abstract description 65
- 230000001681 protective effect Effects 0.000 title claims abstract description 59
- 238000009413 insulation Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 title claims abstract description 15
- 239000011248 coating agent Substances 0.000 title claims abstract description 13
- 238000000576 coating method Methods 0.000 title claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000013013 elastic material Substances 0.000 claims abstract description 14
- 238000005187 foaming Methods 0.000 claims abstract description 8
- 239000004088 foaming agent Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 239000012943 hotmelt Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000002689 soil Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
An on-site joint coating installation method for a polyurethane spraying outer protective pipe and spraying integrally formed thermal insulation pipe. The outer pillar hot-melt welding of tradition repaired mouth board hot melt welding and elastic seal shrink area is connected the quality and can't be promoted, leads to the uneven heat preservation effect of pipeline kneck foaming low, and outer pillar welding is infirm to seep water and causes pipeline heat energy loss, medium temperature to descend. The invention comprises the following components: the steel pipe A (4), the repaired mouth end face of steel pipe A and steel pipe B (2) is fixed through welding, 360 degrees of polyurethane foaming agent are evenly sprayed on the exposed steel pipe A and steel pipe B, after polyurethane is cured for 10-30 minutes, a polyurethane heat insulation layer is formed, a high-pressure liquid spray gun is adopted, high-molecular liquid elastic material is evenly sprayed on the 360 degrees of surface of the polyurethane heat insulation layer, the spraying thickness is 1mm-20mm, the surface forming time after spraying is less than 60 seconds, the curing forming time is within 1-24 hours, and the outer protective pipe is formed by the high-molecular liquid elastic material. The invention relates to a field joint coating installation method for a polyurethane spraying outer protective pipe spraying integrally formed thermal insulation pipe.
Description
The technical field is as follows:
the invention relates to the technical field of prefabricated heat-insulation pipeline installation site construction, in particular to a site joint coating installation method for a polyurethane spraying outer protective pipe spraying integrally formed heat-insulation pipe.
Background art:
the prefabricated direct-buried heat preservation pipe has been introduced into China for 40 years since the 80 s, the heat efficiency of China centralized heat supply is improved, a large amount of energy is saved, but along with a large amount of application, connection at a pipeline interface part needs to be constructed on site, due to reasons such as construction time urgency, natural temperature cooling and the like, after a steel pipe is welded, the connection quality of traditional repaired plate hot-melt welding and outer protection pipe hot-melt welding of an elastic sealing shrinkage band adopted by a repaired port of the heat preservation pipe cannot be improved, the uneven foaming heat preservation effect at the pipeline interface is low, and water seepage caused by unfirm welding and opening of the outer protection pipe is a main reason of poor heat supply quality such as pipeline heat energy loss, medium temperature reduction and the like.
Original repaired mouth board butt fusion is at both ends plus electric heat fusion behind the repaired mouth board package, it is firm that the surface sees to tie up, the hot melt welding reaches integratively, but because outer pillar temperature of pipeline is low, or tie up loosely, lead to outer pillar to touch the hot melt silk, can not melt, only the repaired mouth board melts the back and pastes on outer pillar surface, lead to outer pillar and repaired mouth board can never realize integratively, along with the change of temperature, the extrusion of soil, paste insecure position and will appear the gap and break, moisture enters into the heat preservation immediately in the soil, lead to the heat preservation effect to descend by a wide margin, the pipe network life-span receives the influence.
The invention content is as follows:
the invention aims to provide a method for installing a spot repaired mouth of a polyurethane spraying outer protective pipe spraying integrally formed heat preservation pipe, which is characterized in that a high-molecular liquid outer protective layer is uniformly sprayed on the outer surface of a polyurethane heat preservation layer of the spot repaired mouth of the heat preservation pipe by a high-pressure liquid spray gun at 360 degrees, so that the heat preservation pipe has the advantages of ageing resistance, impact resistance and corrosion resistance, the integrally formed outer protective pipe can be integrated with a pipeline outer protective pipe, the problem of the infiltration of soil moisture into the heat preservation layer is completely isolated, and the high-quality heat preservation effect of the spot construction is completely synchronous with the heat preservation effect and the service life of the prefabricated heat preservation pipe.
The above purpose is realized by the following technical scheme:
a polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method comprises the following steps: the steel pipe A and the repaired mouth end face of the steel pipe B are fixed by welding, a polyurethane heat-insulating layer is sprayed on the outer surfaces of the steel pipe A and the steel pipe B through spraying equipment, an alarm line is arranged in the polyurethane heat-insulating layer, a high-polymer liquid outer protective layer is sprayed on the outer part of the polyurethane heat-insulating layer through the spraying equipment, the spraying equipment comprises a polyurethane mixed spray head and a high-pressure liquid spray gun, and the spraying equipment is connected with a spraying control device;
the polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method comprises the following steps:
firstly, the specification of the heat preservation pipe is DN15-DN4000, the diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipeline is an integrally formed outer protective pipe with standard pipe diameter, and the diameters of two ends of the repaired mouth of the integrally formed outer protective pipe are more than or equal to the outer diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipe;
(1) after the welding detection of the two prefabricated directly-buried heat-insulating pipe welded steel pipes has no leakage, removing dust impurities on the steel pipes and the outer protective pipes, blowing the dust impurities to the welded exposed steel pipes by using a high-frequency heating fan, and heating the steel pipes at 20-30 ℃;
(2) if the original heat preservation pipeline is provided with the monitoring cable, the control cable is required to be connected and fixed in advance;
(3) uniformly spraying a polyurethane foaming agent on the bare steel pipe A and the bare steel pipe B by 360 degrees by adopting mobile polyurethane spraying and foaming equipment, and curing the polyurethane for 10-30 minutes to form a polyurethane heat-insulating layer;
(4) taking the prefabricated directly-buried insulating pipe outer protective pipe as a standard, finishing the polyurethane with the thickness higher than that of the insulating pipe by 360 degrees, and ensuring that the polyurethane insulating layer with 360 degrees and the insulating pipe outer protective pipe are on the same plane or are lower than 1-20mm according to the specification and model of a pipeline;
(5) cleaning impurities on the polyurethane heat-insulating layer by using a fan to achieve a dust-free state;
(6) the high-pressure liquid spray gun is adopted to uniformly spray the high-molecular liquid elastic material on the 360-degree surface of the polyurethane heat-insulating layer, according to the pipeline specification of DN15-DN4000, the uniform spraying thickness of the elastic high-molecular material reaches 1mm-20mm, the design thickness requirement of the outer protective pipe is met, the surface forming time after spraying is less than 60 seconds, the curing forming time is within 1-24 hours, the outer protective pipe formed by the high-molecular liquid elastic material has the elongation at break of 350-600%, the compressive strength of 100Mpa, the shear strength of 20Mpa, the bending strength of 40Mpa, the temperature resistance of minus 60-120 degrees, the resistance to acid and alkali corrosion, and the outer protective pipe formed by other materials is cured into a whole.
Has the advantages that:
1. the invention relates to a method for installing a spot repaired mouth of a polyurethane spraying outer protective pipe spraying integrally formed heat preservation pipe, which solves the problems of uneven foaming and low heat preservation effect at a pipeline joint of a traditional repaired mouth plate, poor heat supply quality such as pipeline heat energy loss, medium temperature reduction and the like caused by infirm welding and water seepage of the outer protective pipe, and simultaneously, the original repaired mouth process is characterized in that a large amount of polyurethane foaming agent is filled after the repaired mouth plate is subjected to hot melting welding, and polyurethane foaming cavities can be caused due to air exhaust and natural temperature, so that the complete heat preservation effect cannot be achieved.
The invention adopts the macromolecule liquid elastic material, and the macromolecule liquid elastic material is evenly sprayed on the surface of polyurethane through the spraying equipment, and is solidified into a whole on the outer protective pipe of the prefabricated heat preservation pipe, the polyurethane heat preservation layer at the repaired mouth and the prefabricated heat preservation pipe outer protective pipe are completely coated by the elastic material, and the solidified polyurethane heat preservation layer and the prefabricated heat preservation pipe outer protective pipe are integrated with the original prefabricated directly-buried heat preservation pipe outer protective pipe due to the characteristics of high strength and high elasticity of the macromolecule liquid elastic material, thereby thoroughly realizing the isolation of temperature and water leakage of soil, realizing the high-quality repaired mouth heat preservation effect required by national standard, and prolonging the service life of a pipe network.
The invention adopts a high molecular liquid elastic material with the density of 1.2g/cm3, the material is formed by mixing two components of a high molecular prepolymer and a functional resin compound and spraying the mixture at high pressure, and because the intermolecular crosslinking density is high and the structure flexibility is good, the material has outstanding strength and toughness, can realize the rapid strengthening and the super toughness protection of the structure, and can ensure that the repaired mouth has high strength and high toughness; meanwhile, the material does not contain a solvent and volatile substances, can be quickly sprayed and formed on any curved surface, and is a solvent-free and pollution-free green spraying material.
The on-site joint coating position of the heat-insulating pipe exceeds the performance of the prior HDPE100 material outer protective pipe, has the characteristics of high impact resistance, high tensile strength, high elongation, excellent wear resistance, aging resistance, chemical corrosion resistance, water resistance, high temperature resistance, low temperature resistance, no pollution in the manufacturing process and the like, is integrally cured with the outer protective pipe made of other materials, realizes seamless connection of the outer protective pipe, has no requirement on the humidity of the operating environment, and is good in manufacturability and simple and reliable to operate.
The manufacturing process realizes that the polyurethane heat-insulating layer at the joint of the repaired mouth of the heat-insulating pipeline is uniform and is completely solidified with the heat-insulating layer of the polyurethane heat-insulating pipeline into a whole, the outer protective pipe which is integrally formed by spraying and solidifying is solidified with the heat-insulating pipeline into a whole, the moisture in soil is thoroughly isolated, and gas and moisture cannot permeate into the heat-insulating layer in the pipe, so that the high-efficiency heat-insulating function of the heat-insulating pipeline system is realized, and the service life of the heat-insulating pipeline system is ensured to be more than 30 years.
The high-molecular liquid elastic material is prepared by mixing two components, namely a high-molecular prepolymer and a functional resin compound, and spraying the mixture at high pressure, and has high intermolecular crosslinking density, high structural flexibility and outstanding strength and toughness, so that the rapid strengthening and super toughness protection of the structure can be realized, and the prefabricated direct-buried heat-insulation valve has high strength and high toughness; meanwhile, the material does not contain a solvent and volatile substances, can be quickly sprayed and formed on any curved surface, and is a solvent-free and pollution-free green spraying material.
The heat-insulating layer is completed under the effective control of an intelligent control system, and the intelligent robot can be used for real-time control on key technical problems of heat-insulating layer density, heat-insulating layer thickness and the like, so that the spraying quality of field joint coating installation of the heat-insulating pipe is effectively ensured.
The invention effectively solves the problems that the polyurethane foaming at the joint of the repaired mouth of the heat preservation pipeline is not uniform, the repaired mouth of the outer protective pipe is not firmly connected and welded, so that the soil moisture permeates into the heat preservation layer, the heat of hot water media in the steel pipe is dissipated through the infiltrated heat preservation layer, the overall heat efficiency of the heat supply pipe network is greatly reduced, the energy consumption is improved, the air pollution is serious, the service life of the pipe network is short, the leakage accident rate is high, and the like.
The on-site repaired mouth installation method of the polyurethane spraying insulation outer protective pipe spraying integrally formed insulation pipe can ensure that the installation quality exceeds the requirements of various indexes of national standards GB/T29047 and GB/T34611.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural diagram of the outer protective layer of the spray-coated polymer liquid of the present invention.
FIG. 3 is a schematic structural view of a sprayed polyurethane insulation layer according to the present invention.
The specific implementation mode is as follows:
example 1:
a polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method comprises the following steps: the steel pipe A4, the repaired mouth end face of steel pipe A and steel pipe B2 is fixed by welding, the outer surface of steel pipe A and steel pipe B is sprayed with polyurethane heat-insulating layer 5 by spraying equipment, alarm line 3 is installed in the polyurethane heat-insulating layer, the outer part of polyurethane heat-insulating layer is sprayed with polymer liquid outer protective layer 1 by spraying equipment 6, the spraying equipment is polyurethane mixed spray head and high pressure liquid spray gun, the spraying equipment is connected with spraying control device 7;
the polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method comprises the following steps:
firstly, the specification of the heat preservation pipe is DN15-DN4000, the diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipeline is an integrally formed outer protective pipe with standard pipe diameter, and the diameters of two ends of the repaired mouth of the integrally formed outer protective pipe are more than or equal to the outer diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipe;
(1) after the welding detection of the two prefabricated directly-buried heat-insulating pipe welded steel pipes has no leakage, removing dust impurities on the steel pipes and the outer protective pipes, blowing the dust impurities to the welded exposed steel pipes by using a high-frequency heating fan, and heating the steel pipes at 20-30 ℃;
(2) if the original heat preservation pipeline is provided with the monitoring cable, the control cable is required to be connected and fixed in advance;
(3) uniformly spraying a polyurethane foaming agent on the bare steel pipe A and the bare steel pipe B by 360 degrees by adopting mobile polyurethane spraying and foaming equipment, and curing the polyurethane for 10-30 minutes to form a polyurethane heat-insulating layer;
(4) taking the prefabricated directly-buried insulating pipe outer protective pipe as a standard, finishing the polyurethane with the thickness higher than that of the insulating pipe by 360 degrees, and ensuring that the polyurethane insulating layer with 360 degrees and the insulating pipe outer protective pipe are on the same plane or are lower than 1-20mm according to the specification and model of a pipeline;
(5) cleaning impurities on the polyurethane heat-insulating layer by using a fan to achieve a dust-free state;
(6) the high-pressure liquid spray gun is adopted to uniformly spray the high-molecular liquid elastic material on the 360-degree surface of the polyurethane heat-insulating layer, according to the pipeline specification of DN15-DN4000, the uniform spraying thickness of the elastic high-molecular material reaches 1mm-20mm, the design thickness requirement of the outer protective pipe is met, the surface forming time after spraying is less than 60 seconds, the curing forming time is within 1-24 hours, the outer protective pipe formed by the high-molecular liquid elastic material has the elongation at break of 350-600%, the compressive strength of 100Mpa, the shear strength of 20Mpa, the bending strength of 40Mpa, the temperature resistance of minus 60-120 degrees, the resistance to acid and alkali corrosion, and the outer protective pipe formed by other materials is cured into a whole.
The manufacturing process realizes the uniformity of the polyurethane heat-insulating layer at the joint of the heat-insulating pipeline repaired mouth, and is completely cured with the polyurethane heat-insulating pipeline heat-insulating layer into a whole, the two ends of the outer protective pipe integrally formed by spraying and curing are cured with the heat-insulating pipeline into a whole, the outer protective pipe formed by the material completely exceeds the performance of the current HDPE hot-melt repaired mouth material, and the material has the characteristics of high impact resistance, high tensile strength, high elongation, excellent wear resistance, aging resistance, chemical corrosion resistance, water resistance, high temperature resistance, low temperature resistance, no pollution in the manufacturing process and the like, thoroughly isolates moisture in soil, gas and moisture can not permeate into the heat-insulating layer in the pipe, thereby realizing the high-efficiency heat-insulating function of a heat-insulating pipeline system, and ensuring the service life of the heat-insulating pipeline system for.
Claims (1)
1. A polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method is characterized by comprising the following steps: the method comprises the following steps: the steel pipe A and the repaired mouth end face of the steel pipe B are fixed by welding, a polyurethane heat-insulating layer is sprayed on the outer surfaces of the steel pipe A and the steel pipe B through spraying equipment, an alarm line is arranged in the polyurethane heat-insulating layer, a high-polymer liquid outer protective layer is sprayed on the outer part of the polyurethane heat-insulating layer through the spraying equipment, the spraying equipment comprises a polyurethane mixed spray head and a high-pressure liquid spray gun, and the spraying equipment is connected with a spraying control device;
the polyurethane spraying outer protective pipe spraying integrally formed insulation pipe field joint coating installation method comprises the following steps:
firstly, the specification of the heat preservation pipe is DN15-DN4000, the diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipeline is an integrally formed outer protective pipe with standard pipe diameter, and the diameters of two ends of the repaired mouth of the integrally formed outer protective pipe are more than or equal to the outer diameter of the outer protective pipe of the prefabricated direct-buried heat preservation pipe;
(1) after the welding detection of the two prefabricated directly-buried heat-insulating pipe welded steel pipes has no leakage, removing dust impurities on the steel pipes and the outer protective pipes, blowing the dust impurities to the welded exposed steel pipes by using a high-frequency heating fan, and heating the steel pipes at 20-30 ℃;
(2) if the original heat preservation pipeline is provided with the monitoring cable, the control cable is required to be connected and fixed in advance;
(3) uniformly spraying a polyurethane foaming agent on the bare steel pipe A and the bare steel pipe B by 360 degrees by adopting mobile polyurethane spraying and foaming equipment, and curing the polyurethane for 10-30 minutes to form a polyurethane heat-insulating layer;
(4) taking the prefabricated directly-buried insulating pipe outer protective pipe as a standard, finishing the polyurethane with the thickness higher than that of the insulating pipe by 360 degrees, and ensuring that the polyurethane insulating layer with 360 degrees and the insulating pipe outer protective pipe are on the same plane or are lower than 1-20mm according to the specification and model of a pipeline;
(5) cleaning impurities on the polyurethane heat-insulating layer by using a fan to achieve a dust-free state;
(6) the high-pressure liquid spray gun is adopted to uniformly spray the high-molecular liquid elastic material on the 360-degree surface of the polyurethane heat-insulating layer, according to the pipeline specification of DN15-DN4000, the uniform spraying thickness of the elastic high-molecular material reaches 1mm-20mm, the design thickness requirement of the outer protective pipe is met, the surface forming time after spraying is less than 60 seconds, the curing forming time is within 1-24 hours, the outer protective pipe formed by the high-molecular liquid elastic material has the elongation at break of 350-600%, the compressive strength of 100Mpa, the shear strength of 20Mpa, the bending strength of 40Mpa, the temperature resistance of minus 60-120 degrees, the resistance to acid and alkali corrosion, and the outer protective pipe formed by other materials is cured into a whole.
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| CN202011139695.3A CN112283467A (en) | 2020-10-22 | 2020-10-22 | Polyurethane spraying outer protective pipe spraying integrally formed insulation pipe on-site joint coating installation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160338A (en) * | 2021-11-15 | 2022-03-11 | 佛山综合能源(公控)有限公司 | Anticorrosive treatment spraying device at insulating tube interface |
| CN114370555A (en) * | 2022-01-25 | 2022-04-19 | 青岛罗宝节能科技有限公司 | Method for integrally repairing corrosion-resistant, heat-insulating and waterproof opening of heat-insulating pipeline |
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| CN202746792U (en) * | 2012-06-21 | 2013-02-20 | 中国石油天然气集团公司 | Pipeline with compound heat-preservation mouth repairing structure in permafrost region |
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