CN103574231A - Construction method for thermal insulation of thermal insulation pipeline joint - Google Patents
Construction method for thermal insulation of thermal insulation pipeline joint Download PDFInfo
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- CN103574231A CN103574231A CN201310549718.1A CN201310549718A CN103574231A CN 103574231 A CN103574231 A CN 103574231A CN 201310549718 A CN201310549718 A CN 201310549718A CN 103574231 A CN103574231 A CN 103574231A
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- Prior art keywords
- oversleeve
- construction
- thermal insulation
- thermal shrinkage
- insulated piping
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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
Abstract
The invention provides a construction method for thermal insulation of a thermal insulation pipeline joint. In the step of forming an outer protection layer, sealing rubber strips are installed in an installation area of the outer walls of adjacent outer protection pipes first, then, the outer wall of a thermal insulation layer is sleeved with a thermal contraction sleeve as the outer protection layer, the two ends of the thermal contraction sleeve are connected to the installation area of the adjacent outer protection pipes in an overlapped mode respectively and just cover the installation area, after the overlapped connection, the sealing rubber strips are away from the end portion of the thermal contraction sleeve for a certain distance, and finally the thermal contraction sleeve is heated, so that in the contraction process of the thermal contraction sleeve, the end portion of the thermal contraction sleeve and the end portions of the outer protection pipes are sealed by the sealing rubber strips in a fused mode. Because the sealing rubber strips are arranged in the installation area and are away from the end portion of the thermal contraction sleeve for a certain distance, it can be guaranteed that when the thermal contraction sleeve contracts, the sealing rubber strips in the fused state can be fused and overflow to the edge of the installation area, and thus the end portion of the thermal contraction sleeve and the end portions of the adjacent outer protection pipes can be connected in the sealed mode by the fused sealing rubber strips.
Description
Technical field
The present invention relates to the method for construction of a kind of novel insulated piping joint thermal insulation, belong to medium transport insulated piping joint Thermo Isolation Technique 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 generally first need to be prefabricated in the factory by length, then carries out construction and installation to scene, in two insulated piping joints, forms joint, and in whole adiabatic pipe network, the quality of jiont treatment will be on producing larger impact the working life of whole pipe network.
The method of construction of in prior art, insulated piping joint being carried out to insulation mainly comprises following two kinds:
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 to jointing as outer protective layer, wherein, the two ends of HDPE cover sleeve are overlapped on respectively on the outer pillar of adjacent two sections of insulated pipings and form overlapping the slot, and wrap up overlapping the slot with shrink belt, cross-linking polyethylene materials on shrink belt is subject to thermal shrinkage, thereby overlapping the slot is sealed; Finally perforate on HDPE cover sleeve, is overlapped between sleeve and jointing and forms polyurethane adiabatic layer at HDPE by the form of foaming.This method of construction has been utilized 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 the movement of HDPE cover sleeve, periodically motion can not be combined closely with polyurethane adiabatic layer HDPE cover sleeve, and finally can depart from completely with polyurethane adiabatic layer, the HDPE cover sleeve that has departed from the constraint of polyurethane adiabatic layer together with soil by aggravation the destruction to shrink belt, affect the sealing of joint, and then affect the heat-insulating property of joint, and this method of construction only limits to the adiabatic construction of pipe with small pipe diameter joint.
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, the HDPE drum sheath that inner peripheral wall is inlayed to electric heating wire is connected on polyurethane adiabatic layer the outer protective layer as jointing, wherein, the two ends of HDPE cover sleeve are overlapped on respectively on the outer pillar of adjacent two sections of insulated pipings and form overlapping the slot, with electro-fusion welding machine, to electric heating wire, switch on again, the contact interface of two HDPE is heated melting and the two ends of described HDPE cover sleeve is tightly connected with the outer pillar of adjacent two sections of insulated pipings respectively, finally, the form by perforate perfusion foaming liquid on HDPE cover sleeve forms polyurethane adiabatic layer between HDPE cover sleeve and jointing.The joint strength of the method construction is higher, but equipment, operant level, construction quality etc. are had relatively high expectations, 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 reduced 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 form mostly, need on HDPE oversleeve, offer foam hole and exhaust port, although after polyurethane adiabatic layer forms, foam hole, exhaust port can be sealed to recovery, because of encapsulating method 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 insulated piping joints of the prior art thermal insulation is subject to the intrinsic defect impact of execution conditions and sealing configuration itself, in work progress, often cannot guarantee the sealing effect of the heat-insulated pipe joint that construction forms, thereby affect the heat-insulating property of insulated piping integral body.
Summary of the invention
Therefore, technical problem to be solved by this invention is to overcome the poor and problem that causes insulated piping heat-insulating property to decline of insulated piping joint tighness that insulated piping joint heat insulating construction method of the prior art produces construction, overcome in prior art simultaneously need to be on oversleeve or sleeve perforate and have the problem of tapping sealability hidden danger, thereby provide a kind of good airproof performance, do not need the method for construction of the insulated piping joint thermal insulation of perforate and heat-insulating property excellence on oversleeve in advance.
For this reason, the invention provides the method for construction of a kind of insulated piping joint thermal insulation, comprise the step that the exposed port of the working pipe of adjacent two sections of insulated pipings is engaged to form interface area, in described interface area, adopt mould foam-in-place to form the step of heat insulation layer, and the step that forms outer protective layer on the part outer wall of the outer wall of described heat insulation layer and the outer pillar of adjacent two sections of insulated pipings, 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 two ends of described thermal shrinkage oversleeve are overlapped on respectively on the described mounting zone of adjacent outer pillar and just in time cover described mounting zone, described sealing joint strip distance described thermal shrinkage oversleeve end certain distance after overlap joint, finally heat described thermal shrinkage oversleeve, so that 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 sealing joint strip is installed, also comprise the step of described mounting zone being carried out to preheating.
In described preheating step, preheating temperature is 50-70 ℃.
In the step of sealing joint strip is installed, one end of described sealing joint strip is wound around at least one week around the excircle of described mounting zone, is fixed on the other end of described sealing joint strip, and forms at least lap length of 30mm until overlap.
After the two ends of described thermal shrinkage oversleeve are overlapped on respectively on the described mounting zone of adjacent outer pillar, described sealing joint strip distance described thermal shrinkage oversleeve end is the distance of 10mm at least.
The lap length of the two ends of described thermal shrinkage oversleeve on the described mounting zone of adjacent outer pillar equates.
Described thermal shrinkage oversleeve is being carried out in the step of heat treated, the centre of the first length direction from thermal shrinkage oversleeve starts heating from the bottom to top, again by the same way one by one to both sides homogeneous heating, when described thermal shrinkage oversleeve completes radial contraction and make the described sealing joint strip of molten state seal the end of described thermal shrinkage oversleeve and adjacent outer pillar, stop heating.
Described thermal shrinkage oversleeve is being carried out in the step of heat treated, adopting flame mode of heating.
Described sealing joint strip is hot melt adhesive tape.
In the step of described formation heat insulation layer, in the foaming liquid of employing, contain isocyanates component, polyether polyol and auxiliary agent, form polyurethane foam.
Adopting mould foaming to form in the step of polyurethane foam, the described mould adopting 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 that then adopts locking device that described roll bending is rolled into.
Adopting mould foaming to form in the step of polyurethane foam, after the two ends of described roll bending are curled into tubular, the described tubular locking that adopts relative spacing to be arranged on two locking blocks on described roll bending and described locking block bundle is rolled into described roll bending as locking device around the connected element of locking.
The described locking block adopting is the angle steel being fixedly connected on described roll bending, and described connected element is chain steel loop; Described in two, on angle steel one side perpendicular to described roll bending, form the more than one breach of mutual correspondence, the width of described breach is applicable to described chain steel loop to be stuck in described breach.
On the described roll bending adopting, be also provided with mounting bar, 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 adopting is formed by thermoplastic resin shell or coiled sheet system.
After foaming forms described heat insulation layer, on the outer wall of described heat insulation layer, laminating is provided for stoping and is arranged in that the gas of described heat insulation layer of described thermal shrinkage oversleeve inside and/or the gas of external environment and moisture see through described thermal shrinkage oversleeve and the barrier layer that circulates.
Plastic pellicle or aluminium foil that the outer wall that described barrier layer is the described heat insulation layer of laminating arranges.
Described plastic pellicle is the single thin film of a kind of formation in polyethylene terephthalate, PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or the single thin film that multiple mixing forms afterwards, or the laminated film being formed by a plurality of single thin film stacks.
Technological scheme of the present invention has the following advantages compared to existing technology:
1. the invention provides the method for construction of a kind of novel insulated piping joint 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 two ends of described thermal shrinkage oversleeve are overlapped on respectively on the described mounting zone of adjacent outer pillar and just in time cover described mounting zone, described sealing joint strip distance described thermal shrinkage oversleeve end certain distance after overlap joint, finally heat described thermal shrinkage oversleeve, so that 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 sealing joint strip being set in mounting zone, and the end certain distance of the described thermal shrinkage oversleeve of described sealing joint strip distance, can guarantee when thermal shrinkage oversleeve shrinks, the sealing joint strip of molten state can overflow to the edge of described mounting zone in melting, thereby the end of described thermal shrinkage oversleeve is connected with the end part seal of adjacent outer pillar.
2. the method for construction of novel insulated piping joint provided by the invention thermal insulation, adopt crosslinked polyethylene oversleeve as thermal shrinkage oversleeve, because crosslinked polyethylene has extremely excellent shrinkage and bond properties, even if sealed colloid, because failure is not installed or installed to construction quality reason, 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, guarantee 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 increased the sealing between outer pillar and thermal shrinkage oversleeve, improve the heat-insulating property of insulated piping joint, thereby improved the heat-insulating property of whole insulated piping.In addition, method of construction of the present invention, adopt prefabricated polyurethane foam tile fragment to form heat insulation layer, avoided in prior art being easy to cause when offering foam hole and exhaust port on cover sleeve the defect of joint potential safety hazard, improve the sealing of joint, and then further guaranteed the heat-insulating property of joint.
3. the joint that the method for construction of employing insulated piping joint of the present invention thermal insulation forms is through the soil-stress test of standard EN 489, after guaranteeing to come and go 300 times, joint does not damage, and the adiabatic joint of prior art can only, under the testing conditions of standard EN 489, guarantee to come and go and not damage for 100 times.The joint that the method for construction formation of insulated piping joint of the present invention thermal insulation is described has excellent machinery and sealability.
4. the method for construction of insulated piping joint of the present invention thermal insulation, in the step of described formation outer protective layer, before sealing joint strip is installed, also comprises the step of described mounting zone being carried out to preheating.The pre-heat treatment is carried out in mounting zone can be become comparatively soft, and easily be fitted on described mounting zone so that sealing joint strip is arranged on behind described mounting zone, is convenient to being uniformly distributed in described mounting zone to sealing joint strip.
5. the method for construction of insulated piping joint of the present invention thermal insulation, in described preheating step, stops heating when described mounting zone is heated to 50-70 ℃.Before sealing joint strip is installed, when being heated to 50-70 ℃, described mounting zone stops heating, be heated to 50-70 ℃, can guarantee that sealing joint strip is laid on mounting zone uniformly, and be fitted on mounting zone, while having avoided preheating temperature too low, thereby cause, the laminating of sealing joint strip in mounting zone is not firm to be caused waterproof and seals inhomogeneous problem, while also having avoided heating-up temperature too high, sealing joint strip shifts to an earlier date melting and can not guarantee the two ends of thermal shrinkage oversleeve and the sealed at both ends defect being connected of outer pillar.
6. the method for construction of insulated piping joint of the present invention thermal insulation, in the step of sealing joint strip is installed, one end of described sealing joint strip is wound around at least one week around the excircle of described mounting zone, is fixed on the other end of described sealing joint strip, and forms at least lap length of 30mm until overlap.This kind of set-up mode can arrange around excircle 360 degree of described outer pillar sealing joint strip, guaranteed that outer pillar arranges on the whole excircle of sealing joint strip and all has good sealing and water-proof performance.
7. the method for construction of insulated piping joint of the present invention thermal insulation, the lap length of the two ends of described thermal shrinkage oversleeve on the described mounting zone of adjacent outer pillar equates.This kind setting can guarantee that the two ends of described thermal shrinkage oversleeve have essentially identical contour projector when thermal shrinkage oversleeve shrinks, thereby guarantees that two ends all have good sealing and outward appearance has aesthetic property.
8. the method for construction of insulated piping joint of the present invention thermal insulation, described thermal shrinkage oversleeve is being carried out in the step of heat treated, the centre of the first length direction from thermal shrinkage oversleeve starts heating from the bottom to top, again by the same way one by one to both sides homogeneous heating, when described thermal shrinkage oversleeve completes radial contraction and make described sealing joint strip overflow edge to mounting zone from melting, 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, starting heating can avoid the two ends heat of the length direction of thermal shrinkage oversleeve heating process to transmit inhomogeneous, guarantee that thermal shrinkage oversleeve evenly shrinks in the longitudinal direction, and, from bottom, starting heating, make heat start from bottom to up to transmit, there is good heat transfer effect, can reduce heating time, improve the efficiency of heating surface; After the heating of centre, according to heating sequence from the lower to the upper, towards the two ends of thermal shrinkage oversleeve, heat gradually, can reduce first to heat the temperature difference at position and rear heating position, avoid because temperature difference is compared with the inhomogeneous defect of shrinkage causing greatly.
9. the method for construction of insulated piping joint of the present invention thermal insulation, is carrying out in the step of heat treated described thermal shrinkage oversleeve, adopts flame mode of heating, simple to operation, saves cost.
10. the adiabatic method of construction of insulated piping joint of the present invention, in the step of described formation heat insulation layer, contains isocyanates 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, has guaranteed the insulation effect of heat insulation layer.
The method of construction of 11. insulated piping joint of the present invention thermal insulation, adopting mould foaming to form in the step of polyurethane foam, the described mould adopting 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 that then adopts locking device that described roll bending is rolled into.In the scope that this roll bending allows in roll bending length, can be rolled into the tubular that various internal diameters differ according to the difference of thermal insulation pipe external diameter, the internal diameter of the tubular that this mould is rolled into is adjustable, can realize a mould and be applicable to the multiple external diameter thermal insulation pipe of (size within limits), so not only saved cost of production, and when this mould is not used or while carrying, this mould can be rolled, it be taken up room little, be convenient to carrying and carry.
The method of construction of 12. insulated piping joint of the present invention thermal insulation, on described roll bending, material hole is set, foam-injection liquid in the space of being convenient to form to described reel and described mounting zone by described material hole, exhaust port is set and is convenient to the gas that produces in foaming process to discharge, thereby avoid occurring having pore in product that foaming forms and affect the situation of quality of product.
The method of construction of 13. insulated piping joint of the present invention thermal insulation, after forming described heat insulation layer, on the outer wall of described heat insulation layer, laminating is provided for stoping and is arranged in that the gas of described heat insulation layer of described thermal shrinkage oversleeve inside and/or the gas of external environment and moisture see through described thermal shrinkage oversleeve and the barrier layer that circulates.In the using process of heat-insulated pipe joint, when the gas in external environment or the moisture tube wall by thermal shrinkage oversleeve is penetrated into barrier layer, being blocked layer stops, thereby make gas or moisture in external environment cannot continue to flow, barrier layer has intercepted flowing that gas in thermal shrinkage oversleeve external environment condition and moisture undertakies by its tube wall, and has reduced 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 existing in heat insulation layer is flowed by the impact of temperature, barrier layer plays the effect that intercepts gas permeation tube wall simultaneously, thereby has guaranteed 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, the damage of having avoided external object to cause barrier layer, while having avoided the water of barrier layer directly and in external environment to contact and the reduction of the barrier property causing simultaneously, thereby guaranteed the life-span of barrier layer, guaranteed the life-span of cover sleeve, that is the life-span of having guaranteed heat-insulated pipe joint.
The method of construction of 14. insulated piping joint of the present invention thermal insulation, described plastic pellicle is the single thin film of a kind of formation in polyethylene terephthalate, PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or the single thin film that multiple mixing forms afterwards, or the laminated film being formed by a plurality of single thin film stacks.Because above-mentioned material is high barrier material, high barrier material has stronger gas and moisture barrier, prevent the problem that the insulation effect of heat insulation layer is reduced due to moisture and other infiltrations, for the insulated piping with a large amount of joints, be significant.
Accompanying drawing explanation
For content of the present invention is 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 that adopts the adiabatic method of construction formation of heat-insulated pipe joint of embodiments of the invention 1;
Fig. 2 is the structural representation of the mould in embodiments of the invention 2;
Fig. 3 is the structural representation of another mode of execution of the 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
For technical characteristics of the present invention, object and effect being had more clearly, understand, now contrast accompanying drawing explanation the specific embodiment of the present invention.
For technical characteristics of the present invention, object and effect being had more clearly, understand, now contrast accompanying drawing explanation the specific embodiment of the present invention.
The present embodiment provides the method for construction of a kind of novel insulated piping joint thermal insulation, comprises
A. the exposed port of the working pipe of adjacent two sections of insulated pipings 1,23,4 is engaged to form the step of interface area;
B. in described interface area, adopt mould foam-in-place to form the step of heat insulation layer 5;
C. at outer wall and adjacent two sections of insulated pipings 1 of described heat insulation layer 5, 2 outer pillar 7, on 8 part outer wall, form the step of outer protective layer, in the step of described formation outer protective layer, first at adjacent described outer pillar 7, sealing joint strip 9 is installed in the mounting zone of 8 outer walls, 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 respectively adjacent outer pillar 7, on 8 described mounting zone, also just in time cover described mounting zone, described sealing joint strip 9 after overlap joint, the described thermal shrinkage oversleeve 6 end certain distances of 10 distance, finally heat described thermal shrinkage oversleeve 6, so that in described thermal shrinkage oversleeve 6 contraction processes, described sealing joint strip 9, thermal shrinkage oversleeve 6 and described outer pillar 7 are stated in 10 melting sealed residences, 8 end, wherein, adopt crosslinked polyethylene oversleeve as thermal shrinkage oversleeve 6.
In the present embodiment, described working pipe 3,4 exposed length are respectively 150mm, and the length of described thermal shrinkage oversleeve 6 is 660mm, the described thermal shrinkage oversleeve 6 end 10mm of described sealing joint strip 9,10 distance, and the width of described sealing joint strip 9,10 is 70mm.
A kind of distortion as the present embodiment, described working pipe 3,4 exposed length can need to be adjusted according to construction respectively in the scope of 150-250mm, and the length of described thermal shrinkage oversleeve 6 for can adjusting according to construction in the scope of 660-680mm.
The method of construction of the present embodiment, by sealing joint strip 9,10 is set in mounting zone, and the end certain distance of the described thermal shrinkage oversleeve 6 of described sealing joint strip 9,10 distance, can guarantee 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, thereby the end of described thermal shrinkage oversleeve 6 is connected with the end part seal of 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 failure is not installed or installed to construction quality reason, 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 7,8 intact being sealed of outer pillar, guarantee the integrality of joints structure form.And, the water-proof function of sealing joint strip 9,10 flexible adhesions and thermal shrinkage oversleeve 6 heating radial contraction functions are combined, further increased the sealing between outer pillar 7,8 and thermal shrinkage oversleeve 6, improve the heat-insulating property of insulated piping joint, thereby improved the heat-insulating property of whole insulated piping.
In the present embodiment, in the step of described formation outer protective layer, before sealing joint strip 9,10 is installed, also comprise the step of described mounting zone being carried out to preheating, in described preheating step, when described mounting zone is heated to 50-70 ℃, stop heating.Before sealing joint strip 9,10 is installed, when being heated to 50-70 ℃, described mounting zone stops heating, be heated to 50-70 ℃, can guarantee that sealing joint strip 9,10 is laid on mounting zone uniformly, and be fitted on mounting zone, while having avoided preheating temperature too low, thereby cause, sealing joint strip 9,10 laminatings in mounting zone are not firm to be caused waterproof and seals inhomogeneous problem, while also having avoided heating-up temperature too high, sealing joint strip 9,10 shifts to an earlier date meltings and can not guarantee the two ends of thermal shrinkage oversleeve 6 and the sealed at both ends defect being connected of outer pillar 7,8.
In the present embodiment, in the step of sealing joint strip 9,10 is installed, one end of described sealing joint strip 9,10 is wound around at least one week around the excircle of described mounting zone, is fixed on the other end of described sealing joint strip 9,10, and forms at least lap length of 30mm until overlap.Certainly, as a kind of distortion of the present embodiment, described sealing joint strip 9,10 one end can also be wound around around the excircle of described mounting zone two weeks, three weeks or week more how, be wound around multiple after, its one end also can be set to be overlapped on the other end, and at least forms the lap length of 30mm.This kind of set-up mode can arrange around excircle 360 degree of described outer pillar 7,8 sealing joint strip 9,10, guaranteed that outer pillar 7,8 arranges on the whole excircle of sealing joint strip 9,10 and all has good sealing and water-proof performance.As a kind of distortion of the present embodiment, can also be arranged side by side a plurality of sealing joint strips 9,10.Described sealing joint strip 9,10 is water chestnut fat hot melt adhesive, can certainly adopt existing other hot melt adhesive tape, for example hybrid type adhesive tape.
In the present embodiment, described thermal shrinkage oversleeve 6 is being carried out in the step of heat treated, the centre of the first length direction from thermal shrinkage oversleeve 6 starts heating from the bottom to top, again by the same way one by one to both sides homogeneous heating, at described thermal shrinkage oversleeve 6, complete radial contraction and make end and the adjacent outer pillar of the described thermal shrinkage oversleeve 6 of described sealing joint strip 9,10 sealing of molten state at 7,8 o'clock, stop heating.
Adopt the method for construction of the present embodiment, from the centre of thermal shrinkage oversleeve 6, starting heating can avoid the two ends heat of the length direction of thermal shrinkage oversleeve 6 heating process to transmit inhomogeneous, guarantee that thermal shrinkage oversleeve 6 evenly shrinks in the longitudinal direction, and, from bottom, start heating, making heat start from bottom to up to transmit, thering is good heat transfer effect, can reduce heating time, improve the efficiency of heating surface; After the heating of centre, according to heating sequence from the lower to the upper, towards the two ends of thermal shrinkage oversleeve 6, heat gradually, can reduce first to heat the temperature difference at position and rear heating position, avoid because temperature difference is compared with the inhomogeneous defect of shrinkage causing greatly.
In the present embodiment, described thermal shrinkage oversleeve 6 is being carried out in the step of heat treated, adopting flame mode of heating.
Adopt the heat-insulated pipe joint of the above-mentioned method of construction formation of the present embodiment, as shown in Figure 1, soil-stress test through standard EN 489, after guaranteeing to come and go 300 times, joint does not damage, and the adiabatic joint of prior art can only, under the testing conditions of standard EN 489, guarantee to come and go and not damage for 100 times.The joint that the method for construction formation of insulated piping joint of the present invention thermal insulation is described has excellent machinery and sealability.
The present embodiment provides the method for construction of a kind of insulated piping joint thermal insulation, it is the further improvement on embodiment 1 basis, in the present embodiment, in foaming, form in the step of described polyurethane foam, adopt a kind of portable joint 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 walls 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 that then adopts locking device that described roll bending 11 is rolled into.In the scope that this roll bending 11 allows in roll bending length, can be rolled into the tubular that various internal diameters differ according to the difference of heat-insulated pipe external diameter, the internal diameter of the tubular that this mould is rolled into is adjustable, one-tenth can be realized the various heat-insulated pipe external diameters that a mould is applicable to multiple external diameter (size within limits), not only saved cost of production, and when this mould is not used or while 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 that relative spacing is arranged on two locking blocks on described roll bending 11, and the described locking block of both sides is tied to the connected element around locking; Described locking block is the angle steel 12 being fixedly connected on described roll bending 11, and described connected element is chain steel loop 13; Described in two, on angle steel 12 one side perpendicular to described roll bending 11, form the more than one breach 14 of mutual correspondence, 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 made as three.
Disposable mode of execution as 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 be evenly arranged on accordingly between two on described mounting bar 15, the described breach 14 on described angle steel 12 is made as one.
Roll bending described in the present embodiment 11 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 avoid occurring having pore in product that foaming forms and affect the situation of quality of product.
The thickness of described roll bending 11 is 3-20 millimeter; When making mould, can select as required, applicable thickness is selected, and can guarantee that this mould can bear certain blow pressure, has again pliability and light weight, has alleviated staff's working strength.
On the basis of above-described embodiment, in the present embodiment, as preferred embodiment, described roll bending 11 is rolled and is formed by thermoplastic resin board, makes this mould have certain pliability, can adapt to the irregular conditions of pipeline profile, such as there being the situations such as ellipse, bias, and in all cases, all there is good sealability, there will not be the phenomenon of leaking material; And this Mold Making is simple, at building-site, just can make; If in work progress, damaging appears in mould, and staff can gather materials on the spot, and makes, thereby avoids cannot constructing because mould damages, and 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 and be formed or sheet metal is made by thermoplastic resin shell.
The present embodiment provides the method for construction of a kind of insulated piping joint thermal insulation, 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 is between the outer wall of described heat insulation layer 5 and the inwall of described thermal shrinkage oversleeve 6, for stoping the gas of described heat insulation layer 5 of described thermal shrinkage oversleeve 6 inside and/or the gas in external environment and moisture to see through described thermal shrinkage oversleeve 6 and the barrier layer of circulation.
In the using process of heat-insulated pipe joint, when the gas in external environment or the moisture tube wall by thermal shrinkage oversleeve 6 is penetrated into barrier layer, being blocked layer stops, thereby make gas or moisture in external environment cannot continue to flow, barrier layer has intercepted flowing that gas in thermal shrinkage oversleeve 6 external environment conditions and moisture undertakies by its tube wall, and has reduced 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 existing in heat insulation layer 5 is flowed by the impact of temperature, barrier layer plays the effect that intercepts gas permeation tube wall simultaneously, thereby has guaranteed 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, the damage of having avoided external object to cause barrier layer, while having avoided the water of barrier layer directly and in external environment to contact and the reduction of the barrier property causing simultaneously, thereby guaranteed the life-span of barrier layer, guaranteed the life-span of cover sleeve, that is the life-span of having guaranteed heat-insulated pipe joint.
In the present embodiment, described plastic pellicle is that ethylene-vinyl alcohol copolymer (EVOH) forms single thin film.As a kind of distortion of the present embodiment, single thin film or above-mentioned material that described plastic pellicle can also mix rear formation for single thin film or the multiple above-mentioned material of a kind of formation in polyethylene terephthalate (PET), PEN (PEN), polyethylene vinyl acetate copolymer (EVA) form respectively the laminated film that is superimposed and forms after single thin film.Above-mentioned material is high barrier material, and high barrier material has good moisture and gas barrier property, prevents the increase of the heat insulation layer thermal conductivity that the infiltration of moisture and gas causes, has guaranteed that heat insulation layer has good insulation effect.
As a kind of distortion of the present embodiment, described barrier layer can also be aluminium foil.
Obviously, above-described embodiment is only for example is clearly described, not the restriction 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 also giving all mode of executions.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (20)
1. a method of construction for insulated piping joint thermal insulation, comprises
The exposed port of the working pipe (3,4) of adjacent two sections of insulated pipings (1,2) is engaged to form to the step of interface area;
In described interface area, adopt mould foam-in-place to form the step of heat insulation layer (5); And
On the part 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), form 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) sealing joint strip (9 is installed in the mounting zone of outer wall, 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 respectively adjacent outer pillar (7, 8) on described mounting zone, also just in time cover described mounting zone, described sealing joint strip (9 after overlap joint, 10) distance described thermal shrinkage oversleeve (6) end certain distance, finally heat described thermal shrinkage oversleeve (6), so that 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 insulated piping joint according to claim 1 thermal insulation, is characterized in that: in the step of described formation outer protective layer, thermal shrinkage oversleeve (6) is crosslinked polyethylene oversleeve.
3. the method for construction of insulated piping joint according to claim 1 and 2 thermal insulation, is characterized in that: in the step of described formation outer protective layer, sealing joint strip (9,10) being installed before, also comprise the step of described mounting zone being carried out to preheating.
4. the method for construction of insulated piping joint according to claim 3 thermal insulation, is characterized in that: in described preheating step, preheating temperature is 50-70 ℃.
5. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-4, it is characterized in that: sealing joint strip (9 is being installed, 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, be fixed on the other end of described sealing joint strip (9,10), and form at least lap length of 30mm.
6. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-5, it is characterized in that: at the two ends of described thermal shrinkage oversleeve (6), be overlapped on respectively adjacent outer pillar (7,8) after on described mounting zone, described sealing joint strip (9,10) distance described thermal shrinkage oversleeve (6) end is the distance of 10mm at least.
7. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-6, it is characterized in that: the lap length of the two ends of described thermal shrinkage oversleeve (6) on the described mounting zone of adjacent outer pillar (7,8) equates.
8. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-7, it is characterized in that: described thermal shrinkage oversleeve (6) is being carried out in the step of heat treated, the centre of the first length direction from thermal shrinkage oversleeve (6) starts heating from the bottom to top, again by the same way one by one to both sides homogeneous heating, at described thermal shrinkage oversleeve (6), complete radial contraction and make the described sealing joint strip (9 of molten state, 10) seal end and the adjacent outer pillar (7 of described thermal shrinkage oversleeve (6), 8), time, stop heating.
9. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-8, it is characterized in that: described thermal shrinkage oversleeve (6) is being carried out in the step of heat treated, adopting flame mode of heating.
10. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-9, it is characterized in that: described sealing joint strip (9,10) is hot melt adhesive tape.
The method of construction of 11. insulated piping joint according to claim 10 thermal insulation, is characterized in that: in the step of described formation heat insulation layer (5), contain isocyanates component, polyether polyol and auxiliary agent in the foaming liquid of employing, form polyurethane foam.
12. according to the method for construction of the insulated piping joint thermal insulation described in claim 10 or 11, it is characterized in that: adopting mould foaming to form in the step of polyurethane foam, the described mould adopting comprises roll bending (11) and is positioned at the locking device 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 that then adopts locking device that described roll bending (11) is rolled into.
The method of construction of 13. insulated piping joint according to claim 12 thermal insulation, it is characterized in that: adopting mould foaming to form in the step of polyurethane foam, after the two ends of described roll bending (11) are curled into tubular, the described tubular locking that adopts relative spacing to be arranged on two locking blocks on described roll bending (11) and described locking block bundle is rolled into described roll bending (11) as locking device around the connected element of locking.
The method of construction of 14. insulated piping joint according to claim 13 thermal insulation, is characterized in that: the described locking block of employing is for to be 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 the more than one breach (14) of mutual correspondence, 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. insulated piping joint according to claim 14 thermal insulation, it is characterized in that: on the described roll bending (11) of employing, be also 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 accordingly on described mounting bar (15) between two.
The method of construction of 16. insulated piping joint according to claim 15 thermal insulation, is characterized in that: it is characterized in that: described roll bending (1) is provided with material hole (16) and exhaust port (17).
17. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 12-16, it is characterized in that: the described roll bending (1) of employing is formed by thermoplastic resin shell or coiled sheet system.
18. according to the method for construction of the insulated piping joint thermal insulation described in any one in claim 1-17, it is characterized in that: foaming the described heat insulation layer of formation (5) afterwards, on the outer wall of described heat insulation layer (5), laminating is provided for stoping and is arranged in the inner gas of described heat insulation layer (5) of described thermal shrinkage oversleeve (6) and/or the gas of external environment and moisture through described thermal shrinkage oversleeve (6) and the barrier layer circulating.
The method of construction of 19. insulated piping joint according to claim 18 thermal insulation, is characterized in that: plastic pellicle or aluminium foil that the outer wall that described barrier layer is the described heat insulation layer of laminating (5) arranges.
The method of construction of 20. insulated piping joint according to claim 19 thermal insulation, it is characterized in that: described plastic pellicle is the single thin film of a kind of formation in polyethylene terephthalate, PEN, polyethylene vinyl acetate copolymer or ethylene-vinyl alcohol copolymer or the single thin film that multiple mixing forms afterwards, or the laminated film being formed by a plurality of single thin film stacks.
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| CN201310549718.1A CN103574231B (en) | 2013-11-06 | 2013-11-06 | A kind of method of construction of thermal insulation of thermal insulation pipeline joint |
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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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| 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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|---|---|
| CN103574231B (en) | 2015-10-21 |
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