CN103574231B - A kind of method of construction of thermal insulation of thermal insulation pipeline joint - Google Patents
A kind of method of construction of thermal insulation of thermal insulation pipeline joint Download PDFInfo
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- CN103574231B CN103574231B CN201310549718.1A CN201310549718A CN103574231B CN 103574231 B CN103574231 B CN 103574231B CN 201310549718 A CN201310549718 A CN 201310549718A CN 103574231 B CN103574231 B CN 103574231B
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- thermal insulation
- oversleeve
- construction
- thermal shrinkage
- thermal
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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
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
- F16L59/182—Joints with sleeve or socket
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
- B29C63/42—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a kind of method of construction of Novel heat insulation pipe coupling thermal insulation, in the step forming outer protective layer, first in the mounting zone of adjacent outer pillar outer wall, sealing joint strip is installed, then on the outer wall of heat insulation layer sheathed thermal shrinkage oversleeve as outer protective layer, the mounting zone that the two ends of thermal shrinkage oversleeve are overlapped on adjacent outer pillar respectively just in time covers described mounting zone, sealing joint strip distance thermal shrinkage oversleeve end certain distance after overlap joint, last heat hot shrinks oversleeve, to make in thermal shrinkage oversleeve contraction process, the end of sealing joint strip melting sealed firmly thermal shrinkage oversleeve and outer pillar.By arranging sealing joint strip in mounting zone, and the end certain distance of sealing joint strip distance thermal shrinkage oversleeve, can ensure when thermal shrinkage oversleeve shrinks, the sealing joint strip of molten state can overflow to the edge of mounting zone in melting, thus is connected by the end part seal of the end of thermal shrinkage oversleeve with adjacent outer pillar.
Description
Technical field
The present invention relates to a kind of method of construction of Novel heat insulation pipe coupling thermal insulation, belong to medium transport thermal insulation of thermal insulation pipeline joint technical field.
Background technique
In fields such as central heat supply, cooling and petroleum gases, the pipeline for medium transport is all needed to carry out insulation, to guarantee the heat-insulating property of pipeline in medium transport process.Insulated piping is general first to be needed to be prefabricated in the factory by length, then carries out construction and installation to scene, forms joint in two insulated piping joints, and in whole adiabatic pipe network, the quality of jiont treatment will produce larger impact to the working life of whole pipe network.
In prior art, following two kinds are mainly comprised to the method for construction that insulated piping joint carries out insulation:
1. adopt thermal shrinkage belt oversleeve to carry out insulation to pipe joint place, during Specific construction, first, adjacent two sections of insulated piping joint welds are fixed; Then, HDPE oversleeve pipe box is connected on jointing as outer protective layer, wherein, HDPE overlaps on outer pillar that the two ends of sleeve are overlapped on adjacent two sections of insulated pipings respectively and forms overlapping the slot, and wrap up overlapping the slot with shrink belt, cross-linking polyethylene materials heat shrinkable on shrink belt, thus overlapping the slot is sealed; Finally overlap perforate on sleeve at HDPE, between HDPE cover sleeve and jointing, form polyurethane adiabatic layer by the form of foaming.This method of construction make use of the excellent sealing effect of shrink belt, but in pipe network operation process, temperature influence pipe network can expand with heat and contract with cold, this will cause HDPE to overlap the movement of sleeve, periodic motion makes HDPE cover sleeve can not combine closely with polyurethane adiabatic layer, and finally can depart from completely with polyurethane adiabatic layer, the HDPE having departed from the constraint of polyurethane adiabatic layer overlaps sleeve together with soil by the destruction of aggravation to shrink belt, affect the sealing of joint, and then affect the heat-insulating property of joint, and this method of construction is only limitted to pipe with small pipe diameter joint thermal insulation construction.
2. adopt electric heating melting welding formula sleeve to carry out insulation to pipe joint place, during Specific construction, first, adjacent two sections of insulated piping joint welds are fixed, then, HDPE drum sheath inner peripheral wall being inlayed electric heating wire is connected on the outer protective layer as jointing on polyurethane adiabatic layer, wherein, HDPE overlaps on outer pillar that the two ends of sleeve are overlapped on adjacent two sections of insulated pipings respectively and forms overlapping the slot, be energized to electric heating wire with electro-fusion welding machine again, the contact interface of two HDPE is made described HDPE overlap sleeve two ends by heating and melting are tightly connected with the outer pillar of adjacent two sections of insulated pipings respectively, finally, the form by overlapping perforate perfusion foaming liquid on sleeve at HDPE forms polyurethane adiabatic layer between HDPE cover sleeve and jointing.The joint strength of the method construction is higher, but require higher to equipment, operant level, construction quality etc., when construction quality is not good or the melt flow rate (MFR) difference of HDPE hot melt sleeve and outer pillar material is excessive, will cause producing gap between HDPE hot melt sleeve and outer pillar, reduce sealing between the two, and then reduce the heat-insulating property of insulated piping joint.
In addition, in the above-mentioned method of construction of prior art, polyurethane adiabatic layer adopts the mode of foam-in-place to be formed mostly, need to offer foam hole and exhaust port on HDPE oversleeve, although after polyurethane adiabatic layer is formed, foam hole, exhaust port can be carried out sealing and recover, because encapsulating method is different, stability is different, is still the bubble-tight important hidden danger of joint herein.
In sum, the method of construction of above-mentioned two kinds of thermal insulation of thermal insulation pipeline joint of the prior art is subject to the intrinsic defect impact of execution conditions and sealing configuration itself, in work progress, often cannot ensure the sealing effect of the heat-insulated pipe joint that construction is formed, thus have impact on the heat-insulating property of insulated piping entirety.
Summary of the invention
Therefore, technical problem to be solved by this invention is that overcoming insulated piping joint heat insulating construction method of the prior art makes the insulated piping joint tighness difference of construction generation and cause the problem that insulated piping heat-insulating property declines, overcome in prior art simultaneously and need perforate on oversleeve or sleeve and the problem that there is tapping sealability hidden danger, thus a kind of good airproof performance is provided, does not need the method for construction of the thermal insulation of thermal insulation pipeline joint of perforate and heat-insulating property excellence on oversleeve in advance.
For this reason, the invention provides a kind of method of construction of thermal insulation of thermal insulation pipeline joint, comprise and the exposed port of the working pipe of adjacent two sections of insulated pipings is engaged with the step forming interface area, mould foam-in-place is adopted to form the step of heat insulation layer in described interface area, and on the outer wall of the outer wall of described heat insulation layer and the outer pillar of adjacent two sections of insulated pipings, form the step of outer protective layer, in the step of described formation outer protective layer, first in the mounting zone of adjacent described outer pillar outer wall, sealing joint strip is installed, then on the outer wall of described heat insulation layer sheathed thermal shrinkage oversleeve as outer protective layer, the described mounting zone that the two ends of described thermal shrinkage oversleeve are overlapped on adjacent outer pillar respectively just in time covers described mounting zone, after overlap joint, described sealing joint strip is apart from described thermal shrinkage oversleeve end certain distance, finally heat described thermal shrinkage oversleeve, to make in described thermal shrinkage oversleeve contraction process, the end of thermal shrinkage oversleeve and described outer pillar is stated in the melting sealed residence of described sealing joint strip.
In the step of described formation outer protective layer, described thermal shrinkage oversleeve is crosslinked polyethylene oversleeve.
In the step of described formation outer protective layer, before installation sealing joint strip, also comprise the step of described mounting zone being carried out to preheating.
In described preheating step, preheating temperature is 50-70 DEG C.
In the step of installing sealing joint strip, one end of described sealing joint strip, around excircle winding at least one week of described mounting zone, until overlap joint is fixed on the other end of described sealing joint strip, and forms the lap length of at least 30mm.
After on the described mounting zone that the two ends of described thermal shrinkage oversleeve are overlapped on adjacent outer pillar respectively, described sealing joint strip is apart from the distance of described thermal shrinkage oversleeve end at least 10mm.
The lap length of two ends on the described mounting zone of adjacent outer pillar of described thermal shrinkage oversleeve is equal.
In the step that described thermal shrinkage oversleeve is heated, first heat from the bottom to top from the centre of the length direction of thermal shrinkage oversleeve, again by the same way one by one to both sides homogeneous heating, when described thermal shrinkage oversleeve completes radial contraction and makes the described sealing joint strip of molten state seal the end of described thermal shrinkage oversleeve and adjacent outer pillar, stop heating.
In the step that described thermal shrinkage oversleeve is heated, adopt flame mode of heating.
Described sealing joint strip is hot melt adhesive tape.
In the step of described formation heat insulation layer, containing isocyanate component, polyether polyol and auxiliary agent in the foaming liquid of employing, form polyurethane foam.
Formed in the step of polyurethane foam adopting mould foaming, the described mould adopted comprises roll bending and is positioned at the locking device on described roll bending outer wall, before foaming, first according to the diameter of the polyurethane foam of prefoam, the two ends of described roll bending are curled into tubular, the described tubular locking then adopting locking device to be rolled into by described roll bending.
Formed in the step of polyurethane foam adopting mould foaming, after the two ends of described roll bending are curled into tubular, adopt the described tubular locking that relative spacing is arranged on two locking blocks on described roll bending and described locking block bundle is rolled into by described roll bending as locking device around the connected element of locking.
The described locking block adopted is be fixedly connected on the angle steel on described roll bending, and described connected element is chain steel loop; On the one side perpendicular to described roll bending of angle steel described in two, form mutually corresponding more than one breach, the width of described breach is applicable to described chain steel loop to be stuck in described breach.
The described roll bending adopted also is provided with mounting bar, and the length of described mounting bar is consistent with the axial length of described roll bending, and described angle steel is set to four, and is evenly arranged on described mounting bar accordingly between two.
Described roll bending is provided with material hole and exhaust port.
The described roll bending adopted is formed by thermoplastic resin shell or coiled sheet system.
Formed after described heat insulation layer in foaming, on the outer wall of described heat insulation layer, laminating arranges the barrier layer for stoping the gas of described heat insulation layer and/or the gas of external environment that are arranged in described thermal shrinkage oversleeve inside and moisture to circulate through described thermal shrinkage oversleeve.
Described barrier layer be fit described heat insulation layer outer wall arrange plastic pellicle or aluminium foil.
The single thin film that described plastic pellicle is polyethylene terephthalate, the single thin film of a kind of formation in PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or multiple mixing are formed afterwards, or the laminated film formed is superposed by multiple single thin film.
Technological scheme of the present invention has the following advantages compared to existing technology:
1. the invention provides a kind of method of construction of Novel heat insulation pipe coupling thermal insulation, in the step of described formation outer protective layer, first in the mounting zone of adjacent described outer pillar outer wall, sealing joint strip is installed, then on the outer wall of described heat insulation layer sheathed thermal shrinkage oversleeve as outer protective layer, the described mounting zone that the two ends of described thermal shrinkage oversleeve are overlapped on adjacent outer pillar respectively just in time covers described mounting zone, after overlap joint, described sealing joint strip is apart from described thermal shrinkage oversleeve end certain distance, finally heat described thermal shrinkage oversleeve, to make in described thermal shrinkage oversleeve contraction process, the end of thermal shrinkage oversleeve and described outer pillar is stated in the melting sealed residence of described sealing joint strip.By arranging sealing joint strip in mounting zone, and described sealing joint strip is apart from the end certain distance of described thermal shrinkage oversleeve, can ensure when thermal shrinkage oversleeve shrinks, the sealing joint strip of molten state can overflow to the edge of described mounting zone in melting, thus is connected by the end part seal of the end of described thermal shrinkage oversleeve with adjacent outer pillar.
2. the method for construction of Novel heat insulation pipe coupling thermal insulation provided by the invention, adopt crosslinked polyethylene oversleeve as thermal shrinkage oversleeve, because crosslinked polyethylene has extremely excellent shrinkage and bond properties, even if sealed colloid, because construction quality reason is not installed or installs failure, also can carry out good sealing; Even if there is great melt flow rate (MFR) otherness between crosslinked polyethylene oversleeve and outer pillar, also can make crosslinked polyethylene oversleeve and intact being sealed of outer pillar, ensure the integrality of joints structure form.And, the attachment function of sealing joint strip flexibility and water-proof function and thermal shrinkage oversleeve heating radial contraction function are combined, further increase the sealing between outer pillar and thermal shrinkage oversleeve, improve the heat-insulating property of insulated piping joint, thus improve the heat-insulating property of whole insulated piping.In addition, method of construction of the present invention, prefabricated polyurethane foam tile fragment is adopted to form heat insulation layer, avoid in prior art by being easy to cause the defect of joint potential safety hazard when overlapping and sleeve offering foam hole and exhaust port, improve the sealing of joint, and then further ensure the heat-insulating property of joint.
3. the joint adopting the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention to be formed is through the soil-stress test of standard EN 489, after ensureing to come and go 300 times, joint does not damage, and the insulating connector of prior art under the testing conditions of standard EN 489, can only ensure to come and go and does not damage for 100 times.Illustrate that the joint that the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention is formed has excellent machinery and sealability.
4. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, in the step of described formation outer protective layer, before installation sealing joint strip, also comprises the step of described mounting zone being carried out to preheating.Carry out after the pre-heat treatment can make sealing joint strip be arranged on described mounting zone, can becoming comparatively soft, and being easily fitted on described mounting zone, be convenient to sealing joint strip being uniformly distributed in described mounting zone to mounting zone.
5. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, in described preheating step, stops heating when described mounting zone being heated to 50-70 DEG C.Before installation sealing joint strip, heating is stopped when described mounting zone being heated to 50-70 DEG C, be heated to 50-70 DEG C, can ensure that sealing joint strip is laid on mounting zone uniformly, and be fitted on mounting zone, avoid preheating temperature too low time, cause the laminating of sealing joint strip in mounting zone loosely thus cause waterproof and seal uneven problem, it also avoid heating-up temperature too high time, sealing joint strip shifts to an earlier date melting and can not ensure the defect that the two ends of thermal shrinkage oversleeve and the two ends of outer pillar are tightly connected.
6. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, in the step of installing sealing joint strip, one end of described sealing joint strip, around excircle winding at least one week of described mounting zone, until overlap joint is fixed on the other end of described sealing joint strip, and forms the lap length of at least 30mm.This kind of set-up mode makes sealing joint strip can around the excircle 360 degree setting of described outer pillar, ensure that the whole excircle that outer pillar arranges sealing joint strip all has sealing and water-proof performance preferably.
7. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, the lap length of two ends on the described mounting zone of adjacent outer pillar of described thermal shrinkage oversleeve is equal.This kind arranges and can ensure that the two ends of described thermal shrinkage oversleeve have substantially identical contour projector when thermal shrinkage oversleeve shrinks, thus ensures that two ends all have good sealing and outward appearance has aesthetic property.
8. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, in the step that described thermal shrinkage oversleeve is heated, first heat from the bottom to top from the centre of the length direction of thermal shrinkage oversleeve, again by the same way one by one to both sides homogeneous heating, described thermal shrinkage oversleeve complete radial contraction and the edge making described sealing joint strip overflow to mounting zone from melting time, observe thermal shrinkage oversleeve and described outer pillar, when described sealing joint strip seals the end of the end of described thermal shrinkage oversleeve and the outer pillar of adjacent two sections of insulated pipings completely, stop heating.From the centre of thermal shrinkage oversleeve, heating can avoid the two ends heat of the length direction of thermal shrinkage oversleeve in heating process to transmit uneven, ensure thermal shrinkage oversleeve uniform shrinkage in the longitudinal direction, and, heating from bottom, heat is made to start from bottom to up to transmit, there is good heat transfer effect, can heating time be reduced, improve the efficiency of heating surface; After the heating of centre, according to heating sequence from the lower to the upper, the two ends towards thermal shrinkage oversleeve are heated gradually, can reduce the temperature difference first heating position and rear heating position, avoid the defect that shrinkage that is that cause is uneven because temperature difference is comparatively large.
9. the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention, in the step heated described thermal shrinkage oversleeve, adopts flame mode of heating, simple to operation, saves cost.
10. thermal insulation of thermal insulation pipeline joint method of construction of the present invention, in the step of described formation heat insulation layer, containing isocyanate component, polyether polyol and auxiliary agent in the foaming liquid of employing.The foaming liquid of this kind of composition makes the polyurethane foam thermal conductivity of formation low, and compressive strength is high, and foam rate of closed hole is high, and foam average pore size is little, ensure that the insulation effect of heat insulation layer.
The method of construction of 11. thermal insulation of thermal insulation pipeline joint of the present invention, formed in the step of polyurethane foam adopting mould foaming, the described mould adopted comprises roll bending and is positioned at the locking device on described roll bending outer wall, before foaming, first according to the diameter of the polyurethane foam of prefoam, the two ends of described roll bending are curled into tubular, the described tubular locking then adopting locking device to be rolled into by described roll bending.This roll bending can be rolled into according to the difference of thermal insulation pipe external diameter the tubular that various internal diameter differs in the scope that roll bending length allows, namely the internal diameter of tubular that is rolled into of this mould is adjustable, the thermal insulation pipe that a mould is applicable to multiple external diameter (size within limits) can be realized, so not only save cost of production, and when this mould does not use or when carrying, this mould can be rolled, it be taken up room little, be convenient to carrying and carry.
The method of construction of 12. thermal insulation of thermal insulation pipeline joint of the present invention, described roll bending arranges material hole, be convenient to by described material hole to foam-injection liquid in the space that described reel and described mounting zone are formed, arrange exhaust port to be convenient to the gas produced in foaming process to discharge, thus the situation avoided there is pore in the product occurring that foaming is formed and affect quality of product.
The method of construction of 13. thermal insulation of thermal insulation pipeline joint of the present invention, after the described heat insulation layer of formation, on the outer wall of described heat insulation layer, laminating arranges the barrier layer for stoping the gas of described heat insulation layer and/or the gas of external environment that are arranged in described thermal shrinkage oversleeve inside and moisture to circulate through described thermal shrinkage oversleeve.In the using process of heat-insulated pipe joint, when the gas in external environment or moisture penetrate into barrier layer by the tube wall of thermal shrinkage oversleeve, be blocked layer to stop, thus make the gas in external environment or moisture cannot continue flowing, barrier layer has intercepted the flowing that gas in thermal shrinkage oversleeve external environment condition and moisture are undertaken by its tube wall, decreases the impact of external environment on fed sheet of a media in the structures such as cover sleeve internal insulation or working pipe; In addition, when the gas existed in heat insulation layer is subject to the impact flowing of temperature, barrier layer plays the effect intercepting gas permeation tube wall simultaneously, thus ensure that the performance of heat insulation layer.In addition, because barrier layer is arranged between thermal shrinkage oversleeve and heat insulation layer, barrier layer is not contacted with external environment, avoid the damage that external object causes barrier layer, avoid the reduction of the barrier property caused when barrier layer directly contacts with the water in external environment simultaneously, thus ensure that the life-span of barrier layer, namely ensure that the life-span of cover sleeve, that is ensure that the life-span of heat-insulated pipe joint.
The method of construction of 14. thermal insulation of thermal insulation pipeline joint of the present invention, the single thin film that described plastic pellicle is polyethylene terephthalate, the single thin film of a kind of formation in PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or multiple mixing are formed afterwards, or the laminated film formed is superposed by multiple single thin film.Because above-mentioned material is high barrier material, high barrier material has stronger gas and moisture barrier, prevent due to moisture and other infiltrations and make the problem that the insulation effect of heat insulation layer reduces, the insulated piping with a large amount of joint is significant.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the heat-insulated pipe joint schematic diagram adopting the adiabatic method of construction of the heat-insulated pipe joint of embodiments of the invention 1 to be formed;
Fig. 2 is the structural representation of a kind of implementation methods of mould in embodiments of the invention 2;
Fig. 3 is the structural representation of another mode of execution of mould in embodiments of the invention 2;
In figure, reference character is expressed as: 1,2-insulated piping; 3,4-working pipe; 5-heat insulation layer; 6-thermal shrinkage oversleeve; 7, the outer pillar of 8-; 9,10-sealing joint strip; 11-roll bending; 12-angle steel; 13-chain steel loop; 14-breach; 15-mounting bar; 16-material hole; 17-exhaust port.
Embodiment
In order to there be understanding clearly to technical characteristics of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
In order to there be understanding clearly to technical characteristics of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Embodiment 1
The present embodiment provides a kind of method of construction of Novel heat insulation pipe coupling thermal insulation, comprises
A. the exposed port of the working pipe 3,4 of adjacent two sections of insulated pipings 1,2 is engaged with the step forming interface area;
B. mould foam-in-place is adopted to form the step of heat insulation layer 5 in described interface area;
C. at outer wall and adjacent two sections of insulated pipings 1 of described heat insulation layer 5, the outer pillar 7 of 2, the outer wall of 8 is formed the step of outer protective layer, in the step of described formation outer protective layer, first at adjacent described outer pillar 7, in the mounting zone of 8 outer walls, sealing joint strip 9 is installed, 10, then on the outer wall of described heat insulation layer 5 sheathed thermal shrinkage oversleeve 6 as outer protective layer, the two ends of described thermal shrinkage oversleeve 6 are overlapped on adjacent outer pillar 7 respectively, the described mounting zone of 8 also just in time covers described mounting zone, described sealing joint strip 9 after overlap joint, 10 apart from described thermal shrinkage oversleeve 6 end certain distance, finally heat described thermal shrinkage oversleeve 6, to make in described thermal shrinkage oversleeve 6 contraction process, described sealing joint strip 9, thermal shrinkage oversleeve 6 and described outer pillar 7 are stated in 10 melting sealed residences, the end of 8, wherein, adopt crosslinked polyethylene oversleeve as thermal shrinkage oversleeve 6.
In the present embodiment, the exposed length of described working pipe 3,4 is respectively 150mm, and the length of described thermal shrinkage oversleeve 6 is 660mm, and described sealing joint strip 9,10 is apart from described thermal shrinkage oversleeve 6 end 10mm, and the width of described sealing joint strip 9,10 is 70mm.
One as the present embodiment is out of shape, the exposed length of described working pipe 3,4 can adjust according to construction needs respectively in the scope of 150-250mm, and the length of described thermal shrinkage oversleeve 6 is can adjust according to construction needs in the scope of 660-680mm.
The method of construction of the present embodiment, by arranging sealing joint strip 9,10 in mounting zone, and described sealing joint strip 9,10 is apart from the end certain distance of described thermal shrinkage oversleeve 6, can ensure when thermal shrinkage oversleeve 6 shrinks, the sealing joint strip 9,10 of molten state can overflow to the edge of described mounting zone in melting, thus is connected by the end part seal of the end of described thermal shrinkage oversleeve 6 with adjacent outer pillar 7,8.The cover sleeve that employing cross-linking polyethylene materials is made is as thermal shrinkage oversleeve 6, because crosslinked polyethylene has extremely excellent shrinkage and bond properties, even if sealing joint strip 9,10, because construction quality reason is not installed or installs failure, also can carry out good sealing; Even if there is great melt flow rate (MFR) otherness between crosslinked polyethylene oversleeve and outer pillar, also can make crosslinked polyethylene oversleeve and intact being sealed of outer pillar 7,8, ensure the integrality of joints structure form.And, the water-proof function of sealing joint strip 9,10 flexible adhesion and thermal shrinkage oversleeve 6 are heated radial contraction function combine, further increase the sealing between outer pillar 7,8 and thermal shrinkage oversleeve 6, improve the heat-insulating property of insulated piping joint, thus improve the heat-insulating property of whole insulated piping.
In the present embodiment, in the step of described formation outer protective layer, before installation sealing joint strip 9,10, also comprise the step of described mounting zone being carried out to preheating, in described preheating step, when described mounting zone being heated to 50-70 DEG C, stop heating.Before installation sealing joint strip 9,10, heating is stopped when described mounting zone being heated to 50-70 DEG C, be heated to 50-70 DEG C, can ensure that sealing joint strip 9,10 is laid on mounting zone uniformly, and be fitted on mounting zone, avoid preheating temperature too low time, cause the laminating of sealing joint strip 9,10 in mounting zone loosely thus cause waterproof and seal uneven problem, it also avoid heating-up temperature too high time, sealing joint strip 9,10 shifts to an earlier date melting and can not ensure the defect that the two ends of thermal shrinkage oversleeve 6 and the two ends of outer pillar 7,8 are tightly connected.
In the present embodiment, in the step of installing sealing joint strip 9,10, one end of described sealing joint strip 9,10, around excircle winding at least one week of described mounting zone, until overlap joint is fixed on the other end of described sealing joint strip 9,10, and forms the lap length of at least 30mm.Certainly, one as the present embodiment is out of shape, and more all described sealing joint strip 9,10 one end can also be wound around two weeks, three weeks around the excircle of described mounting zone or, be wound around multiple after, its one end also can be set to overlap joint on an opposite end, and at least forms the lap length of 30mm.This kind of set-up mode makes sealing joint strip 9,10 can around the excircle 360 degree setting of described outer pillar 7,8, ensure that the whole excircle that outer pillar 7,8 arranges sealing joint strip 9,10 all has sealing and water-proof performance preferably.One as the present embodiment is out of shape, and can also be arranged side by side multiple sealing joint strip 9,10.Described sealing joint strip 9,10 is water chestnut fat hot melt adhesive, can certainly adopt other hot melt adhesive tape existing, such as hybrid type adhesive tape.
In the present embodiment, in the step that described thermal shrinkage oversleeve 6 is heated, first heat from the bottom to top from the centre of the length direction of thermal shrinkage oversleeve 6, again by the same way one by one to both sides homogeneous heating, when described thermal shrinkage oversleeve 6 completes radial contraction and makes the described sealing joint strip 9,10 of molten state seal end and the adjacent outer pillar 7,8 of described thermal shrinkage oversleeve 6, stop heating.
Adopt the method for construction of the present embodiment, from the centre of thermal shrinkage oversleeve 6, heating can avoid the two ends heat of the length direction of thermal shrinkage oversleeve 6 in heating process to transmit uneven, ensure thermal shrinkage oversleeve 6 uniform shrinkage in the longitudinal direction, and, heating from bottom, making heat start from bottom to up to transmit, there is good heat transfer effect, can heating time be reduced, improve the efficiency of heating surface; After the heating of centre, according to heating sequence from the lower to the upper, the two ends towards thermal shrinkage oversleeve 6 are heated gradually, can reduce the temperature difference first heating position and rear heating position, avoid the defect that shrinkage that is that cause is uneven because temperature difference is comparatively large.
In the present embodiment, in the step that described thermal shrinkage oversleeve 6 is heated, adopt flame mode of heating.
Adopt the heat-insulated pipe joint that the above-mentioned method of construction of the present embodiment is formed, as shown in Figure 1, through the soil-stress test of standard EN 489, after ensureing to come and go 300 times, joint does not damage, and the insulating connector of prior art under the testing conditions of standard EN 489, can only ensure to come and go and does not damage for 100 times.Illustrate that the joint that the method for construction of thermal insulation of thermal insulation pipeline joint of the present invention is formed has excellent machinery and sealability.
Embodiment 2
The present embodiment provides a kind of method of construction of thermal insulation of thermal insulation pipeline joint, it is the further improvement on embodiment 1 basis, in the present embodiment, formed in the step of described polyurethane foam in foaming, adopt a kind of Portable connector foaming mould, as shown in Figure 2, described foaming mould comprises the roll bending 11 that can be rolled into tubular, and be positioned on described roll bending 11 outer wall, the locking device of the tubular locking that described roll bending 11 is rolled into.Before foaming, first according to the diameter of the polyurethane foam of prefoam, the two ends of described roll bending 11 are curled into tubular, the described tubular locking then adopting locking device to be rolled into by described roll bending 11.This roll bending 11 can be rolled into according to the difference of heat-insulated pipe external diameter the tubular that various internal diameter differs in the scope that roll bending length allows, namely the internal diameter of tubular that is rolled into of this mould is adjustable, one-tenth can realize the various heat-insulated pipe external diameters that a mould is applicable to multiple external diameter (size within limits), not only save cost of production, and when this mould does not use or when carrying, this mould can be rolled, it be taken up room little, be convenient to carrying and carry.
In the present embodiment, described locking device comprises relative spacing and is arranged on two locking blocks on described roll bending 11, and by the connected element of the described locking block bundle of both sides around locking; Described locking block is be fixedly connected on the angle steel 12 on described roll bending 11, and described connected element is chain steel loop 13; On the one side perpendicular to described roll bending 11 of angle steel 12 described in two, form mutually corresponding more than one breach 14, the width of described breach 14 is applicable to described chain steel loop 13 to be stuck in described breach 14; As preferred embodiment, the length of described angle steel 12 is consistent with the axial length of described roll bending 1, and the described breach 14 on described angle steel 12 is set to three.
As the disposable mode of execution of above-described embodiment, as shown in Figure 3, the present embodiment is provided with mounting bar 15 on described roll bending 11, the length of described mounting bar 15 is consistent with the axial length of described roll bending 11, described angle steel 12 is set to four, and being evenly arranged on described mounting bar 15 accordingly between two, the described breach 14 on described angle steel 12 is set to one.
Roll bending 11 described in the present embodiment is provided with material hole 16 and exhaust 17; Described material hole is used for injecting frothing material, the gas that described exhaust port 17 produces when reacting in order to discharge the foam material that is injected into, thus the situation avoided there is pore in the product occurring that foaming is formed and affect quality of product.
The thickness of described roll bending 11 is 3-20 millimeter; When making mould, can select as required, the thickness be applicable to is selected, and can ensure that this mould can bear certain blow pressure, have again pliability and light weight, alleviate the working strength of staff.
On the basis of above-described embodiment, in the present embodiment, as preferred embodiment, described roll bending 11 is rolled by thermoplastic resin board and forms, and makes this mould have certain pliability, can adapt to the irregular conditions of pipeline profile, than if any the situation such as oval, eccentric, and in all cases, all there is good sealability, there will not be the phenomenon of leaking material; And this Mold Making is simple, just can make at building-site; If in work progress, damaging appears in mould, and staff can gather materials on the spot, and makes, thus avoids cannot constructing because of burn failure, delays the duration, affects job schedule.
Certainly, as the disposable mode of execution of above-described embodiment, described roll bending 11 can also be rolled by thermoplastic resin shell and to form or sheet metal is made.
Embodiment 3
The present embodiment provides a kind of method of construction of thermal insulation of thermal insulation pipeline joint, it is the distortion on embodiment 1 basis, in the present embodiment, in work progress, after forming described heat insulation layer 5, on the outer wall of described heat insulation layer 5, laminating arranges plastic pellicle as barrier layer, described barrier layer between the outer wall and the inwall of described thermal shrinkage oversleeve 6 of described heat insulation layer 5, for the barrier layer stoping the gas in the described heat insulation layer 5 of described thermal shrinkage oversleeve 6 inside and/or the gas in external environment and moisture to circulate through described thermal shrinkage oversleeve 6.
In the using process of heat-insulated pipe joint, when the gas in external environment or moisture penetrate into barrier layer by the tube wall of thermal shrinkage oversleeve 6, be blocked layer to stop, thus make the gas in external environment or moisture cannot continue flowing, barrier layer has intercepted the flowing that gas in thermal shrinkage oversleeve 6 external environment condition and moisture are undertaken by its tube wall, decreases the impact of external environment on fed sheet of a media in the structures such as heat insulation layer 5 or working pipe; In addition, when the gas existed in heat insulation layer 5 is subject to the impact flowing of temperature, barrier layer plays the effect intercepting gas permeation tube wall simultaneously, thus ensure that the performance of heat insulation layer 5.In addition, because barrier layer is arranged between thermal shrinkage oversleeve 6 and heat insulation layer 5, barrier layer is not contacted with external environment, avoid the damage that external object causes barrier layer, avoid the reduction of the barrier property caused when barrier layer directly contacts with the water in external environment simultaneously, thus ensure that the life-span of barrier layer, namely ensure that the life-span of cover sleeve, that is ensure that the life-span of heat-insulated pipe joint.
In the present embodiment, described plastic pellicle is that ethylene-vinyl alcohol copolymer (EVOH) forms single thin film.One as the present embodiment is out of shape, described plastic pellicle can also for the single thin film that formed after the single thin film of polyethylene terephthalate (PET), PEN (PEN), a kind of formation in polyethylene vinyl acetate copolymer (EVA) or the mixing of multiple above-mentioned material or above-mentioned material form single thin film respectively after to be superimposed the laminated film formed.Above-mentioned material is high barrier material, and high barrier material has excellent moisture and gas barrier property, the increase of the heat insulation layer thermal conductivity preventing the infiltration of moisture and gas from causing, and ensure that heat insulation layer has good insulation effect.
One as the present embodiment is out of shape, and described barrier layer can also be aluminium foil.
Obviously, above-described embodiment is only for clearly example being described, the restriction not to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all mode of executions.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (20)
1. a method of construction for thermal insulation of thermal insulation pipeline joint, comprises
The exposed port of the working pipe (3,4) of adjacent two sections of insulated pipings (1,2) is engaged with the step forming interface area;
Mould foam-in-place is adopted to form the step of heat insulation layer (5) in described interface area; And
The outer wall of the outer wall of described heat insulation layer (5) and the outer pillar (7,8) of adjacent two sections of insulated pipings (1,2) is formed the step of outer protective layer;
It is characterized in that: in the step of described formation outer protective layer, first at adjacent described outer pillar (7, 8) in the mounting zone of outer wall, sealing joint strip (9 is installed, 10), then on the outer wall of described heat insulation layer (5) sheathed thermal shrinkage oversleeve (6) as outer protective layer, the two ends of described thermal shrinkage oversleeve (6) are overlapped on adjacent outer pillar (7 respectively, 8) described mounting zone also just in time covers described mounting zone, described sealing joint strip (9 after overlap joint, 10) apart from described thermal shrinkage oversleeve (6) end certain distance, finally heat described thermal shrinkage oversleeve (6), to make in described thermal shrinkage oversleeve (6) contraction process, with described sealing joint strip (9, 10) thermal shrinkage oversleeve (6) and described outer pillar (7 are stated in melting sealed residence, 8) end.
2. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1, is characterized in that: in the step of described formation outer protective layer, and thermal shrinkage oversleeve (6) is crosslinked polyethylene oversleeve.
3. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, is characterized in that: in the step of described formation outer protective layer, before installation sealing joint strip (9,10), also comprises the step of described mounting zone being carried out to preheating.
4. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 3, is characterized in that: in described preheating step, and preheating temperature is 50-70 DEG C.
5. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, it is characterized in that: at installation sealing joint strip (9,10) in step, described sealing joint strip (9,10) one end is wound around at least one week around the excircle of described mounting zone, until overlap joint is fixed on the other end of described sealing joint strip (9,10), and form the lap length of at least 30mm.
6. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, it is characterized in that: be overlapped on adjacent outer pillar (7 respectively at the two ends of described thermal shrinkage oversleeve (6), 8) after on described mounting zone, described sealing joint strip (9,10) is apart from the distance of described thermal shrinkage oversleeve (6) end at least 10mm.
7. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, is characterized in that: the lap length of two ends on the described mounting zone of adjacent outer pillar (7,8) of described thermal shrinkage oversleeve (6) is equal.
8. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, it is characterized in that: in the step that described thermal shrinkage oversleeve (6) is heated, first heat from the bottom to top from the centre of the length direction of thermal shrinkage oversleeve (6), again by the same way one by one to both sides homogeneous heating, complete radial contraction described thermal shrinkage oversleeve (6) and make the described sealing joint strip (9 of molten state, 10) end of described thermal shrinkage oversleeve (6) and adjacent outer pillar (7 is sealed, 8), time, heating is stopped.
9. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, is characterized in that: in the step heated described thermal shrinkage oversleeve (6), adopts flame mode of heating.
10. the method for construction of thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, is characterized in that: described sealing joint strip (9,10) is hot melt adhesive tape.
The method of construction of 11. thermal insulation of thermal insulation pipeline joint according to claim 10, is characterized in that: in the step of described formation heat insulation layer (5), containing isocyanate component, polyether polyol and auxiliary agent in the foaming liquid of employing, forms polyurethane foam.
The method of construction of 12. thermal insulation of thermal insulation pipeline joint according to claim 10, it is characterized in that: formed in the step of polyurethane foam adopting mould foaming, the locking device that the described mould adopted comprises roll bending (11) and is positioned on described roll bending (11) outer wall, before foaming, first according to the diameter of the polyurethane foam of prefoam, the two ends of described roll bending (11) are curled into tubular, the described tubular locking then adopting locking device to be rolled into by described roll bending (11).
The method of construction of 13. thermal insulation of thermal insulation pipeline joint according to claim 12, it is characterized in that: formed in the step of polyurethane foam adopting mould foaming, after the two ends of described roll bending (11) are curled into tubular, adopt the described tubular locking that relative spacing is arranged on two locking blocks on described roll bending (11) and described locking block bundle is rolled into by described roll bending (11) as locking device around the connected element of locking.
The method of construction of 14. thermal insulation of thermal insulation pipeline joint according to claim 13, is characterized in that: the described locking block of employing is for being fixedly connected on the angle steel (12) on described roll bending (11), and described connected element is chain steel loop (13); On angle steel described in two (12) one side perpendicular to described roll bending (11), form mutually corresponding more than one breach (14), the width of described breach (14) is applicable to described chain steel loop (13) to be stuck in described breach (14).
The method of construction of 15. thermal insulation of thermal insulation pipeline joint according to claim 14, is characterized in that:
The described roll bending (11) adopted also is provided with mounting bar (15), the length of described mounting bar (15) is consistent with the axial length of described roll bending (11), described angle steel (12) is set to four, and is evenly arranged on described mounting bar (15) accordingly between two.
The method of construction of 16. thermal insulation of thermal insulation pipeline joint according to claim 15, is characterized in that:
It is characterized in that: described roll bending (1) is provided with material hole (16) and exhaust port (17).
The method of construction of 17. thermal insulation of thermal insulation pipeline joint according to any one of claim 12-16, is characterized in that: the described roll bending (1) of employing is formed by thermoplastic resin shell or coiled sheet system.
The method of construction of 18. thermal insulation of thermal insulation pipeline joint according to claim 1 and 2, it is characterized in that: after foaming forms described heat insulation layer (5), on the outer wall of described heat insulation layer (5), laminating arranges and is used for prevention and is arranged in the barrier layer that the inner gas of described heat insulation layer (5) of described thermal shrinkage oversleeve (6) and/or the gas of external environment and moisture circulates through described thermal shrinkage oversleeve (6).
The method of construction of 19. thermal insulation of thermal insulation pipeline joint according to claim 18, is characterized in that: described barrier layer is plastic pellicle or the aluminium foil of the outer wall setting of the described heat insulation layer of laminating (5).
The method of construction of 20. thermal insulation of thermal insulation pipeline joint according to claim 19, it is characterized in that: the single thin film that described plastic pellicle is polyethylene terephthalate, the single thin film of a kind of formation in PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or multiple mixing are formed afterwards, or superposed the laminated film formed by multiple single thin film.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105526438A (en) * | 2016-01-29 | 2016-04-27 | 上海宝冶集团有限公司 | Joint end structure of composite heat-insulating pipes and construction method of joint end structure |
| CN107795795A (en) * | 2017-10-20 | 2018-03-13 | 北京市热力集团有限责任公司 | A kind of live insulation construction and construction method of prefabricated thermal insulation straight tube and special piece |
| CN114542819A (en) * | 2022-02-24 | 2022-05-27 | 济南市市政工程设计研究院（集团）有限责任公司 | Integrated fixed pipe seat structure for comprehensive pipe gallery and mounting method |
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| US4788090A (en) * | 1986-04-02 | 1988-11-29 | Shell Internationale Research Maatschappij B.V. | Fire resistant plastic pipe |
| US7960978B2 (en) * | 2008-10-21 | 2011-06-14 | Thermacor Process, Lp | Method for providing leak detection in pre-insulated piping |
| CN202109155U (en) * | 2011-05-19 | 2012-01-11 | 中国石油天然气集团公司 | Repaired mouth of glass fiber reinforced plastic outer protection foam insulation steel pipe |
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