Pipeline lengthen the life layer, lengthen the life pipeline and pipeline is lengthened the life techniqueTechnical field
The invention belongs to corrosion-resistant fields, and in particular to a kind of pipeline lengthen the life layer, layer of lengthening the life using this lengthen the life pipeline andPipeline is lengthened the life technique.
Background technique
Concrete duct is one of the most common type in existing aqueduct, in all water transferring lines, concrete plugCost is minimum, intensity is high, rigidity is good, equipment investment is small, therefore receives user in the market and widely welcome.But due to mixedSolidifying soil inner wall of the pipe is coarse, interface easy to leak, easily by acid medium burn into easily breeds Thallophyta, and application also receives non-Often big limitation.In order to extend the service life of concrete duct, in the prior art often using antiseepage aseptic technic to its intoRow processing, mainly includes following methods:
(1) by spraying waterproof material on the inner wall and outer wall of concrete duct or preparing erosion resistant coating, thusThe waterproof membrane with certain ductility, elastoplasticity, crack resistance type, impermeability and weatherability is formed on concrete duct inside and outside wall,Play the role of the waterproof, seepage control to concrete tube body itself.
(2) in the preparation process of concrete duct, the waterproof of permeable crystallization type is directly added into the proportion of concreteMaterial, such as macromolecule polymer material reach to play the pore structure for improving inside concrete and hinder external water moleculeCause effect of the harmful substance of corrosion to pipe of concrete internal penetration with other.
In the above method, the leakage and etching problem that the waterproof material of internal doping type generates concrete structure crack are severalEffect is not had, and the roughness of inner wall of the pipe is not affected, the service efficiency of pipeline is unable to improve, so existingIn technology, carrying out preservative treatment to the inside and outside wall of concrete duct becomes the technique of lengthening the life of main concrete duct.It is existingIn technology, to concrete duct carry out anti-corrosion life-extension treatment method mainly include cement mortar squeezing and coating method, CIPP Internal Lining Method,HDPE pipe insertion lining method.Cement mortar squeezing and coating method is as its name suggests that the generation of concrete duct surface is filled up using cement mortarGap or crack, to have the function that anti-corrosion is lengthened the life.The shortcomings that cement mortar squeezing and coating method, is that cement mortar itself causesDensity is limited, and the effect played is very limited, and is difficult in the construction process levelling, and construction wrong will lead to pipeline water deliveryEfficiency reduces.
HDPE pipe insertion lining method is outer diameter to be equal to or slightly less than in the high density polyethylene (HDPE) of internal diameter of the pipeline to be repairedInternal lining pipe is become U-shaped, and by 30% or more the reduced cross-sectional of internal lining pipe, pass through by dedicated U-shaped press device by bushing pipeThe processes such as winding sizing, traction pull in, external force is restored are combined together bushing pipe tightly with inner wall of the pipe, to be formed to oldThe reparation of inner wall of the pipe avoids the diminution to original pipe diameter to greatest extent.The phase compared with HDPE pipe insertion lining methodAs technique there are also stainless steel tube Internal Lining Methods etc..HDPE pipe insertion lining method although repair ability is strong, in application still byLimit, the reason is that this method needs all fronts pipeline to be replaced, complex disposal process is especially thick in pipeline length, caliberIn the case where, construction technology is especially complicated, and due to being the compound of two kinds of pipelines, HDPE pipeline and original concrete ductBetween the degree that is tightly combined be difficult to be controlled, the small anti-corrosion that will cause of binding force is invalid, and binding force can then bring greatly pipeline negativePress through big problem.
CIPP Internal Lining Method, which is called, does in-situ solidifying method, is one kind during pipe lining is repaired, mainly passes through ultraviolet radiatorThe hose that irradiation has been soaked with specific resin makes resin carry out deep cure, Lining Hose is made to be placed in a kind of novel height in old pipeThe pipe lining repair mode of effect.Prefabricated hose is mainly dragged in inside the old pipeline for needing to repair by its process flow, thenSolidification lamps and lanterns are put into inside hose inner membrance, are respectively blocked the installation blind plate at hose both ends, last tube is turned on light solidification.CIPPMethod has application in the work of the pipeline corrosion protection reparation of many special dimensions, for example, adopting in nuclear power station since repairing effect is goodWhen using steel production route as seawater pressure aqueduct, since the osmosis of chloride ion can be to concrete duct insideSteel plate, the reinforcing bar of sealing generate corrosiveness, infiltration or pipeline breaking situation occur, to seriously affect steel cylinder concreteThe service life of pipeline, especially such pipe design service life are generally 30 years and are set to underground pipe gallery or buried, and electricService life of standing is generally 40 years to 60 years, is far from satisfying power plant's operation demand.The prior art occur seeping water in pipeline orUnder corrosion condition, when defect is smaller, rejected region concrete is cut in unit maintenance period of reloading, material is repaired using concreteMaterial (cement mortar, polymer mortar etc.) repair, when defect expand when, unit reload the maintenance period carry out local replacing(factors such as space, environment cause generally accomplish integral replacing), integral replacing can be accomplished using in-situ solidifying rule.
But in above-mentioned application, CIPP method is still had the following problems:
1, the material of liner often uses the combination of polyester fiber and resin, the problem of due to intensity itself and performance, GuThe liner layer bearing capacity formed after change is insufficient, is easy to cause liner layer to collapse, bulge, rupture；
2, the solidification temperature of liner determines the solidification effect of liner layer, once solidification effect is bad, then integrated artistic reportIt is useless, cause construction cost to rise violently；
3, liner solidification after, the volume of inner lining material can generate a degree of variation, be easy to cause pipe lining layer withDuct wall combination is not close, especially the combination in pipe ends portion, once dealing with improperly, it will cause the internal layer at both ends and pipesIt intakes between road wall, whole pipeline corrosion protection technique of lengthening the life is made to lose meaning.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides one kind for solidifying inner lining in the prior art intoThe pipeline of row improve and perfect is lengthened the life layer, and is provided a kind of application pipeline and lengthened the life the pipeline of lengthening the life of layer, and is additionally provided simultaneouslyThe process that a kind of pair of pipeline is lengthened the life.
Present invention technical effect to be achieved is realized by following scheme:
Pipeline provided in the present invention is lengthened the life layer, and inner wall of the pipe is set to, and the layer of lengthening the life is the anti-corrosion after ultraviolet light solidifiesLayer, the rate that radially extends are 2.4-3.2%, axially extending rate≤2%, maximum working pressure (MWP) 1MPa.
Further, the radial dimension at layer both ends of lengthening the life is greater than the radial dimension of other positions.
Further, the layer of lengthening the life is tubular, and entire outer diameter is less than internal diameter of the pipeline to be repaired before ultraviolet light solidifies0.5-3%, ultraviolet light solidify after layer of lengthening the life with a thickness of 3-15mm；Length is greater than to be repaired before layer ultraviolet light of lengthening the life solidifiesDuct length；The layer of lengthening the life successively includes inner membrance, fiber and resin mixed layer, outer membrane, clad from the inside to the outside；The inner membranceWith outer membrane with a thickness of 0.1-1mm, the coating thickness is 0.1-0.5mm.The inner membrance, outer membrane, clad are macromoleculeMaterial, and the clad has the function of obstructing ultraviolet light；The fiber and resin mixed layer be fibrage at sizingFabric impregnates the mixed layer that UV-cured resin is formed.
Layer provided in the present invention of lengthening the life is set to the inner wall of pipeline to be repaired by special technique, radial and axial at itWith different elongation percentage, compared with liner in the prior art, it is bigger that the layer of lengthening the life in the present invention radially extends rate, makes to lengthen the lifeLayer is in inflation, can bear bigger pressure in solidification process, thus being bonded more closely with pipeline to be repaired, while axial direction is prolongedRate control is stretched lower than 2%, and making to lengthen the life, deformation is unlikely to excessive to layer in the axial direction, and influence is lengthened the life thickness degree.
In layer of lengthening the life of the invention, the thickness of inner membrance, fiber and resin mixed layer, outer membrane and clad theoretically can rootAccording to needing to carry out calculating setting, in actual use, inner membrance and outer film thickness are preferably 0.1-1mm, and coating thickness is excellentIt is selected as 0.1-0.5mm, above-mentioned thickness setting is so that the structure sheaf footprint for not playing main anti-corrosion life-prolonging function is small, stillIt can satisfy use demand again.Inner membrance, outer membrane can be polyethylene, high density polyethylene (HDPE), polyvinyl chloride, wherein excellent on the outside of inner membranceThe holding hair side of choosing increases layer of lengthening the life so that more firmly bonding is integrally formed with fiber and resin mixed layer after hardeningVoltage endurance capability.Choice of Resin in fiber and resin mixed layer uses the commercially available epoxy acrylic tree containing light triggering agentRouge, polyurethane acrylic resin, unsaturated light thixotropic polyester and its mixture type UV-cured resin.Clad is mainPurposes be for stopping ultraviolet light, the layer that makes to lengthen the life be in front of curing it is flexible, clad can be opaque polyethylene, highly denseSpend polyethylene, polyvinyl chloride or itself and fiber composite film, be mainly used for liner hose transportational process stop ultraviolet light andProtect hose from mechanical damage.
It additionally provides one kind in the present invention to lengthen the life pipeline, the pipeline body is concrete pressure pipeline, and pipe end is setSteel flanges are set, the inner wall of the pipe uses layer of lengthening the life as described above.Layer of lengthening the life in the present invention is particularly preferably suitable forEnd connects the concrete pressure pipeline to form pipeline using steel flanges, makes steel flanges avoid contacting with layer of lengthening the life, in turnThe gap of water flow intrusion flange and layer intersection of lengthening the life, causes stealthy corrosion during avoiding pipeline from being on active service.
It is additionally provided in the present invention using above-mentioned layer of lengthening the life as the technical matters of inner wall of the pipe erosion resistant coating.Provided pipeRoad technique of lengthening the life includes the following steps:
Step 1, ultraviolet light are lengthened the life the preparation of layer before solidifying: according to size compatible with internal diameter of the pipeline to be repaired and lengthFibrage is bonded into compatible tubular inner membrance at the fabric of tubular structure, by plastic film by degree, and then fabric is arrangedIt is coated on the outside of inner membrance, fabric is impregnated into ultraviolet curing type resin, roller rolls removal additional air and adjusts to settingThen thickness coats plastic cement diaphragm on the outside of fabric and forms outer membrane, cover the clad of one layer of isolation ultraviolet light in outer membrane face；Layer both ends of lengthening the life of above structure are closed using sealing end lid, the sealing end is covered equipped with to be opened/closed and inner membrance internal mutualLogical venthole；
Step 2, the solidification for layer of lengthening the life: the layer of lengthening the life being prepared in step 1 is placed in pipeline to be repaired, is openedThe venthole that covers is blocked, to a layer inner inflatable of lengthening the life, the layer that makes to lengthen the life is closely attached in inner wall of the pipe, using ultraviolet lamp in layer of lengthening the lifeSolidification is irradiated inside inner membrance, inflation carries out simultaneously with solidification until layer solidification of lengthening the life finishes；
Pipe end post-processing: step 3 by the extra layer cutting of lengthening the life in pipe ends portion, is polished smooth, is then utilizedPacking material containing resin carries out end-enclosed.
In the present invention, first, in accordance with the specification of scene pipeline to be repaired, the design thickness that is prefabricated in the factory, specification it is originalLengthen the life layer (non-photocuring), then by primitive pipeline internal maintenance to smooth, without obvious sharp object, primitive pipeline inner wall of end intoRow pretreatment.The layer of lengthening the life of non-photocuring is dragged in pipeline, it is solid through ultraviolet light after inflation is tightly attached to primitive pipeline inner wallChange, by the extra layer cutting of lengthening the life in pipe ends portion, polishes smooth, then carry out end envelope using the packing material containing resinIt closes.Further, the pipeline to be repaired carries out the screed on its both ends inner wall along caliber before adding and lengthening the life layerEquably machinery cuts and polishes smooth；The 0.5-1.5% with a thickness of caliber that the screed is cut, the length cut be fromThe inside 50-500mm of pipe end.Carrying out above-mentioned processing can make the radial dimension at layer both ends of lengthening the life after solidifying be greater than otherThe radial dimension of position is not in the prior art so that the layer of lengthening the life in pipeline be made tightly to be bonded and be stuck in pipelineThe constructional deficiency of the liner integral slipping often occurred in CIPP technique greatly reduces a possibility that technique fails, is implementingIt will do it further elucidated above and explanation in example.
Further, in step 3, lengthen the life after layer ultraviolet light solidification, an extra layer both ends of lengthening the life cut off,Excision is 5-50cm to layer end is lengthened the life with a distance from pipe end, and is no more than caliber and increases region, and will lengthen the life a layer end polishingAt the hill-like structure gradually increased from pipe end to pipeline inner thickness, then utilize the packing material containing resin to instituteA layer end of lengthening the life is stated to be closed.Traditional CIPP method is asked in addition to depositing technology stated in the background in actual useOther than topic, there is also not wide enough the problems of use scope.Pipeline used in nuclear power station is needed using concrete pressure pipeline, pressureHydraulic piping end is equipped with steel flanges and forms continuous pipeline for connecting single tube.Traditional CIPP method is although can be applied toSingle tube carries out anti-corrosion and lengthens the life, but once will be by CIPP method treated single tube connects into pipeline, in the pipeline course of work, waterStream can invade inside pipeline along the gap between flange and liner, generate corrosion to pipeline, this corrosion is more concealed, potentialMenace it is bigger, due to could not enough solve the above problems always, therefore existing CIPP method or the side similar with CIPP methodMethod could not access application on concrete pressure pipeline.This step layer that then will effectively lengthen the life is kept apart with steel flanges, thoroughlyIt avoids steel flanges and generates any gap between layer of lengthening the life, to effectively avoid stealthy corrosion, prevent potential corrosion failureIt threatens.
Further, in step 2, the blowing pressure 10-100kPa, the blowing pressure and pipe diameter to be repaired atInverse ratio.
Further, in step 2, by inflate, deflate repeatedly, pull adjustment lengthen the life layer fitting tightness and position.
The invention has the following advantages that
1, lengthen the life layer the present invention provides a kind of pipeline with good anti-corrosion effect, and provide the construction of the layer of lengthening the lifeThe pipeline of technique and the application layer of lengthening the life, the layer of lengthening the life in the present invention are particularly suitable for end equipped with the mixed of steel flanges structureThe anti-corrosion of solidifying soil pressure hydraulic piping, can effectively extend its service life, aqueous medium is thoroughly isolated with concrete duct, prevent rottenErosion occurs.
2, the pipeline technique of lengthening the life in the present invention avoids passively repairing, and primitive pipeline is isolated with seawater in advance for active,It avoids pipeline from further corroding, achievees the purpose that extend pipeline service life.The technology is small to space requirement simultaneously, all materialPipeline can be entered by Pipe installing hole and expansion joint installation site, implement short time limit, save a large amount of works compared with prior artPhase avoids overhaul claim for eot bring economic loss.
3, the pipeline in the present invention lengthen the life technique use from different processing method in the prior art, after solidification being madeLayer both ends of lengthening the life radial dimension be greater than other positions radial dimension, thus make the layer of lengthening the life in pipeline be tightly bonded andIt is stuck in pipeline, is not in the constructional deficiency of the liner integral slipping often occurred in CIPP technique in the prior art, drops significantlyA possibility that low technique failure, expands being applicable in for the type technique to reduce the construction cost of the technique indirectlyRange.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of pipe of concrete structure before pipeline life-extension treatment of lengthening the life of the invention；
Fig. 2 is the schematic cross-sectional view of the concrete duct after the completion of pipeline life-extension treatment of lengthening the life of the invention；
Fig. 3 is a layer schematic structural cross-sectional view of lengthening the life of the invention；
Fig. 4 is layer of lengthening the life of the invention in ultraviolet light external structure schematic diagram before curing.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
BONNA pipe life-extension treatment technique in embodiment nuclear power station essential raw cooling water system gallery
BONNA to be repaired pipe is typical concrete pressure pipeline in the present embodiment, and steel flanges are arranged in pipe endContinuous pipeline is formed for connecting single tube.In pipeline piping lane located underground, piping lane sectional dimension 2.8m × 2.6m, only two1.5m × 3m hole for hoist, installing expansion joint space between pipeline and pipeline for 300mm can be used as the entrance that material enters pipeline,Internal diameter of the pipeline 695mm, operating pressure 0.3MPa.
During military service, due to the pipeline Service Environment be briny environment, by seawater and marine organisms corrosion compared withTo be serious, anti-corrosion is carried out to it using many different restorative procedures during overhaul and is lengthened the life.In actual use situation,Mortar repairing effect difference is not paid attention to completely, and insertion lining method is since live place is limited, BONNA pipe volume to be repaired is bigAnd the space being not carried out at all, therefore CIPP method can only be used, and if directly using existing CIPP method, the existing liner of one sideProtective layer is easy integral slipping loosening, fold occurs in surface, and the success rate of construction is extremely low, once ging wrong to come again, causesGreat cost waste, on the other hand, the liner protective layer after solidification connects with steel flanges, extra large in the pipeline course of workWater water flow can along the gap between flange and liner invade pipeline inside, to pipeline generate corrosion, it is this corrosion it is more concealed,Potential menace is bigger, and especially even more serious corrosion condition occur in flange connections on tube wall, can only remove linerProtective layer re-starts protection, not only causes technique waste, but also potentially danger is huge.
The present inventor looks for another way in view of the above problems, is changed on the basis of original in-situ solidifying methodInto construction technology is as follows:
Step 1, ultraviolet light are lengthened the life the preparation of layer before solidifying
Layer of lengthening the life used in the present embodiment is tubular, is the layer of lengthening the life of ultraviolet curing type, i.e., before ultraviolet light solidificationFor flexible layer, it is easy to transport, pulls, ultraviolet light then forms the structure sheaf of sizing after solidifying.Layer of lengthening the life in embodiment is ultravioletThe 0.5-3% that entire outer diameter is less than internal diameter of the pipeline to be repaired before photocuring is advisable, leave and take it is certain solidify the space swollen, simultaneouslyExcessive situation will not be caused stress to original pipeline to be repaired again.
In principle, the thickness degree of lengthening the life after ultraviolet light solidifies can be on active service according to pipeline during fluid flux and settingTransfer efficiency is calculated, and in actual use, the layer of lengthening the life after ultraviolet light is solidified is advisable with a thickness of 3-15mm, for mostGood range of choice.Length is greater than duct length to be repaired before layer ultraviolet light of lengthening the life solidifies, and to guarantee to lengthen the life, layer can cover completelyIt is placed in inner wall of the pipe.
As shown in Fig. 3, layer of lengthening the life successively includes inner membrance 6011, fiber and resin mixed layer 6012, outer membrane from the inside to the outside6013, (due to being difficult to find out line of demarcation closely to coat, the two is separated to clad 6014 for outer membrane and clad in attached drawing 3Structure, should not have any query herein).It is best, coating thickness 0.1- that inner membrance and outer film thickness, which are selected as 0.1-1mm,0.5mm is best.Inner membrance, outer membrane and coating thickness need to be controlled, in order to avoid influence the function of final layer of lengthening the life.Above-mentioned thicknessSetting is so that the structure sheaf footprint for not playing main anti-corrosion life-prolonging function is small, but can satisfy use demand again.ThisIn embodiment, fiber selection selects high density polyethylene (HDPE) without the corrosion resistant ECR glass fibre of boron modification, inner membrance, outer membrane, wherein inHair side is kept on the outside of film, is bonded as one after hardening with fiber and resin mixed layer, resin contains light using commercially availableThixotroping M-phthalic acid pentyl ester class unsaturated polymer, the clad of outer barrier ultraviolet light is the polyethylene of black.
In addition to preparation early period for layer of lengthening the life, pipeline to be repaired is before adding and lengthening the life layer, by the sand on its both ends inner wallPulp layer carries out equably machinery along caliber and cuts and polish smooth.As shown in Fig. 1,101 is mixed for the external reinforcing bar of pipe of concreteSolidifying soil, 201 be sheet metal inside pipe of concrete, and 202 be the end-thickened steel plate of pipe of concrete, and 301 be pipe of concrete inner wall mortarLayer, 401 connect steel flanges for end.Pipeline to be repaired is in preliminary preparation, by the screed 301 on its inner wall of endEquably machinery being carried out along caliber to cut and polish smooth, the part cut forms the screed 501 to connect with layer of lengthening the life later,The thickness (as shown in Fig. 1, should subtract thickness B with a thickness of the thickness of screed 301) that screed is cut is the 0.5- of caliber1.5% is advisable, and the length (as shown in Fig. 1, which is A) cut is from the inside 50-500mm of pipe end.Such asShown in attached drawing 1, screed 501 is further preferably polished into arcuation contact surface far from end side, can make to lengthen the life layer moreSmooth is adjacent to tube wall.
Concrete operations technique in this step are as follows:
According to size compatible with internal diameter of the pipeline to be repaired and length by fibrage at tubular structure fabric, will modelingMaterial diaphragm is bonded into compatible tubular inner membrance, and then fabric is arranged and is coated on the outside of inner membrance, fabric is impregnated UV lightChange type resin, roller roll removal additional air and adjust to the thickness of setting, and plastic cement diaphragm shape is then coated on the outside of fabricAt outer membrane, the clad of one layer of isolation ultraviolet light is covered in outer membrane face, forms complete structure (according to field pipes internal diameter695mm, the 7mm that is prefabricated in the factory be thick, outer diameter 685mm layer of lengthening the life), as shown in Fig. 4, forms tubular and lengthen the life the main body of layer6015, layer both ends of lengthening the life of above structure are closed using sealing end lid 6016 and 6017, the sealing end, which covers, to be equipped with and can openThe venthole with intercommunication inside inner membrance closed.
Step 2, the solidification for layer of lengthening the life
The layer of lengthening the life being prepared in above-mentioned steps is placed in pipeline to be repaired, the venthole that sealing end covers is opened,To a layer inner inflatable of lengthening the life, the blowing pressure 40-50kPa, in general, the blowing pressure are inversely proportional with pipe diameter to be repaired,Namely Large Diameter Pipeline uses relatively low the blowing pressure, and small diameter tube uses relatively high the blowing pressure, and the layer that makes to lengthen the life is closely attached on pipeOn road inner wall, it can also cooperate and inflate, deflate repeatedly, pulling the fitting tightness for adjusting layer of lengthening the life and position, utilize ultraviolet lampSolidification is irradiated inside layer inner membrance of lengthening the life, and (ultraviolet lamp can be put into before curing lengthens the life in layer, while what is be put into goes backHave the camera of internal observation, be bonded primitive pipeline when lengthening the life layer using camera observation, if having fold trace), it fillsGas carries out finishing up to layer solidification of lengthening the life with solidification simultaneously, as shown in Fig. 2, forms the layer 601 of lengthening the life after solidifying.
Carry out step 1 in the processing of primitive pipeline after, as shown in Fig. 2, it can be seen that layer both ends of lengthening the life after solidificationRadial dimension be greater than the radial dimensions of other positions, so that the layer of lengthening the life in pipeline be made tightly to be bonded and be stuck in pipeline,Be not in the constructional deficiency of the liner integral slipping often occurred in CIPP technique in the prior art, greatly reduce technique mistakeA possibility that losing.
Step 3, pipe end post-processing
Lengthen the life after the solidification of layer ultraviolet light, an extra layer both ends of lengthening the life cut off, excision to lengthen the life layer end fromPipe end distance is that 5-50cm can (as shown in Fig. 2, distance be labeled as C herein, which can carry out according to the actual situationAdjustment), and be no more than caliber and increase region, layer end that will lengthen the life, which is polished into from pipe end to pipeline inner thickness, to be gradually increasedHill-like structure, then layer end of lengthening the life is closed using epoxy resin mortar.This step will effectively lengthen the life layer and steelPreparation method orchid keeps apart, and thoroughly avoids steel flanges and generates any gap between layer of lengthening the life, to effectively avoid stealthy corrosion, shuts outCorrosion failure potential absolutely threatens.
In embodiment lengthen the life layer solidification before radially extend rate be 2.4-3.2%, axially extending rate≤2%, after solidification mostBig operating pressure 1MPa, compared with liner in the prior art, it is bigger that the layer of lengthening the life in the embodiment of the present invention radially extends rate, makesLayer lengthen the life in inflation, can bear bigger pressure in solidification process, thus being bonded more closely with pipeline to be repaired, while axisIt is lower than 2% to elongation control, making to lengthen the life, deformation is unlikely to excessive to layer in the axial direction, and influence is lengthened the life thickness degree.
In addition, the material bending modulus for layer of lengthening the life is 5200MPa, thermal expansion coefficient is 39 × 10-6/ DEG C, and concreteThermal expansion coefficient be 10 × 10-6/ DEG C, and it is 92-95 DEG C that ultraviolet light, which solidifies the solidification processing temperature for layer of lengthening the life, is much higher than pipelineService temperature (5-50 DEG C).In this way, the radial dimension at layer both ends of lengthening the life is still greater than the radial direction of other positions after curing moldingSize, then after reducing temperature, a layer both ends of lengthening the life are remained unchanged, and layer of lengthening the life can integrally be shunk, and form tensile stress, size is notIt can change, end will not be subjected to displacement.
Finally, it should be noted that above embodiments be only to illustrate the technical solution of the embodiment of the present invention rather than to its intoRow limitation, although the embodiment of the present invention is described in detail referring to preferred embodiment, those skilled in the artIt should be understood that the technical solution of the embodiment of the present invention can be still modified or replaced equivalently, and these are modified or waitThe range of modified technical solution disengaging technical solution of the embodiment of the present invention cannot also be made with replacement.