CN104633392B - A kind of jointing method - Google Patents
A kind of jointing method Download PDFInfo
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- CN104633392B CN104633392B CN201410780656.XA CN201410780656A CN104633392B CN 104633392 B CN104633392 B CN 104633392B CN 201410780656 A CN201410780656 A CN 201410780656A CN 104633392 B CN104633392 B CN 104633392B
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- repaired mouth
- stirrup
- jointing method
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- piece
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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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of jointing method, including step：A. surface treatment b. steel pipes preheating c. repaired mouth pieces wrap d. coated metal interior lining panels e. and wrap up and lock stirrup and electric calorifie installation f. programs heating g. dismounting equipments.The metal inner lining plate antirust ability of the present invention is strong, and be integrated with repaired mouth piece strong bond, barrier of the repaired mouth layer to visible ray, ultraviolet light, water, oxygen and vapor is greatly improved, the resistance to sharp objects mechanical damage is also strengthened, and the repaired mouth layer life-span is substantially improved.The present invention locks pressurization using stirrup, can apply immense pressure in softening bonding process to repaired mouth piece, greatly improve the adhesive strength to steel pipe；23 DEG C of peel strength can reach more than 250N/cm, and 50 DEG C of peel strength reaches 100 more than N/cm, respectively heat shrinking sleeve（Band）2 times of repaired mouth and more than 5 times.
Description
Technical field
The invention belongs to gas transmission, Pipeline Construction technical field, and in particular to a kind of jointing method.
Background technology
Steel pipe used in pipe-line construction, it is necessary to first pass through preservative treatment in advance, 3LPE, 3LPP prevent
Rotten layer is the anticorrosion structure generally used in anti-corrosion outside pipeline.Soldering opening is often reserved during pipeline corrosion protection, it is general wide
Spend for 100-150mm, docking steel pipe is welded to each other at reserved weld bond, the prefabricated anticorrosive coat in two ends is wrapped on docking steel pipe.
The anti-corrosion of steel pipe soldering opening is completed at the construction field (site), and its joint coating on pipeline technology used is imitated to the overall anti-corrosion of pipeline
Fruit is very significant considering that, because it is related to the final anticorrosive quality of whole piece pipeline.No matter 3LPE, 3LPP prevent in pre-fabricated factory
How excellent rotten layer quality be, if the bad steel pipe that may result in of live repaired mouth effect produces heavy corrosion, makes buried pipeline
Service life shorten, or even cause leakage etc. serious consequence.
The soldering opening anti-corrosion of 3LPE, 3LPP anti-corrosion pipeline generally uses thermal shrinkable sleeve（Band）Patch technology, the construction of the technology
Method is：Cladding after epoxy primer, priming paint surface drying is brushed on after handling repaired mouth ground and shrinks set（Band）, toast thermal contraction
Set（Band）It is shunk, while making the hotmelt melts on heat shrinking sleeve, reaches and stops heating after appropriate level, treat heat shrinking sleeve
It is fixed on after natural cooling at repaired mouth.This traditional thermal shrinkable sleeve patch technology has the disadvantage that in use：
1. thermal shrinkable sleeve（Band）General to bake handle flame baking by man-hour manually hand-held, temperature accuracy and uniformity are difficult to accurately
Control.Temperature is relatively low to can not guarantee adhesive effect, and hot-spot easily makes thermal shrinkable sleeve（Band）Carbonize, received when heating uneven
Contracting is inconsistent to cause bubble and fold, and repaired mouth quality is difficult to ensure that.
2. thermal shrinkable sleeve（Band）PUR polarity used is strong, and molecular weight is low, compatible with the PE or PP of straight tube anti-corrosion layer surface
Property it is bad, when crosslinked polyethylene base material is heated in addition elastic contractile force less, the limited pressure applied to PUR, PUR with
Can not form reliable bonding between straight tube anticorrosive coat, it is buried after easily occur unsticking cracking phenomena, cause repaired mouth to fail.
3. radiant crosslinked polyethylene heat shrinkable band（Set）The extruded shaping of palpus, crosslinking with radiation, expanding, cooling, gluing etc. are more
Procedure is made, and cost is high, and can not thermoplastic reclaim, certain destruction can be caused to environment.
The content of the invention
To overcome above-mentioned the deficiencies in the prior art, it is simple and convenient to operate, prevents it is an object of the invention to provide a kind of technique
The high jointing method of rotten performance.
The present invention is achieved by the following technical solutions：
A kind of jointing method, at least comprises the following steps：
A. it is surface-treated：Steel tube surface to joint coating on pipeline position is decontaminated and derusting by sandblasting；
B. steel pipe is preheated：The steel pipe at joint coating on pipeline position is preheating to 30 ~ 100 DEG C；
C. repaired mouth piece is wrapped：Repaired mouth piece is wrapped on the surface at joint coating on pipeline position；
D. coated metal interior lining panel：Metal inner lining plate is wrapped on repaired mouth piece；
E. wrap up and lock stirrup and electric calorifie installation：Stirrup is wrapped in outside metal inner lining plate, stirrup passes through machinery end to end
Locking device is locked, and electric calorifie installation is covered in stirrup outer layer, fitted closely with stirrup；
F. temperature programmed control：Switch on power, temperature controller setting value is adjusted to 180 ~ 260 DEG C, keep 10 ~ 60min.；Cut-out heating
Power supply, slowly cools to less than 50 DEG C；
G. equipment is removed：Release mechanism locking device, removes electric calorifie installation and stirrup.
In step a of the present invention, repaired mouth position steel tube surface is carried out after blasting treatment, steel tube surface quality should reach
Sa2.5 grades, steel tube surface dust is removed totally with compressed air immediately after derusting by sandblasting.
In step b of the present invention, can use a variety of existing modes, such as electric heating coil heating, electromagnetic induction heating, it is infrared add
Heat, liquefaction gas flame heating etc., 30 ~ 100 DEG C are preheating to by the steel pipe at joint coating on pipeline position（With the infrared thermometry by verification
Monitoring temperature is counted, preheating temperature can be properly increased when ambient temperature is low）.The purpose of heating is the water for removing absorption on steel pipe
Part, improve repaired mouth quality.
The present invention replaces existing thermal shrinkable sleeve with repaired mouth piece（Band）, for 3LPE anticorrosive coats, the material of the repaired mouth piece is
The blend of maleic anhydride grafted polyethylene copolymer and polyethylene, its blending ratio is 1:0~1:10, overall grafting rate reaches
More than 0.1wt% is advisable；For 3LPP anticorrosive coats, the material of the repaired mouth piece is maleic anhydride inoculated polypropylene copolymer and poly-
The blend of propylene, its blending ratio is 1:0~1:10, overall grafting rate reaches that more than 0.1wt% is advisable.
Repaired mouth piece width（Along pipeline axial direction）There is circular groove centre, and groove bosom is 1.0 ~ 3.0mm,
Its width is advisable than the repaired mouth position small 0 ~ 5mm of annular weld bead width.Groove is close to steel pipe when can wrap repaired mouth piece, is also beneficial to
Metal inner lining plate is close to repaired mouth sheet material all the time, improves repaired mouth quality.
The length of repaired mouth piece width straight portion is consistent with the possible minimum length of exposed steel pipe at weld bond, flat part
It is uniform thinning area to divide two ends, often holds width to be advisable in 50 ~ 100mm.Repaired mouth leaf length direction（Along pipeline circumferential direction）It is straight
The most short 60mm smaller than pipeline girth in part, the most long 100mm more than pipeline girth, straight portion two ends are similarly uniform thinning area,
Often end length is advisable in 30 ~ 60mm.Uniform thinning area can be such that repaired mouth piece is smoothed out with the prefabricated anticorrosive coat in two ends and itself overlap joint, favorably
It is close to repaired mouth sheet material all the time in metal inner lining plate, improves repaired mouth quality.
, can be fixed according to the length of the exposed steel pipe in welding bead both sides when the length change scope of the exposed steel pipe in repaired mouth position is excessive
Repaired mouth piece processed, makes repaired mouth piece groove both sides straight portion length correspond to therewith.
The thickness of repaired mouth piece straight portion should be slightly bigger than the prefabricated anticorrosive coat thickness in two ends, reach the prefabricated anticorrosive coat thickness in two ends
100 ~ 150% be advisable.
Repaired mouth piece can be tensed when wrapping with devices such as euphroes, then be fixed with stator or adhesive sticker, it is possible to use electricity
Flatiron is welded and fixed.
The length of the metal inner lining plate long 20 ~ 120mm of anticorrosive coat girth more prefabricated than two ends, width is wider than repaired mouth piece by 20 ~
240mm, thickness is 0.2 ~ 1.0mm.Metal inner lining wrench tail two ends can metal plate shape in the arc-shaped in advance, arc radius and steel pipe half
Footpath is identical, and two ends radian is respectively 30o ~ 60o.Metal inner lining sheet material matter is selected from stainless steel, galvanized steel, tin-coated steel, aluminum-plated steel, plating
One or more in nickel steel, chromium-plated steel, fine aluminium, aluminium alloy, fine copper or copper alloy.
In step d of the present invention, the metal inner lining plate wrapped can temporarily be fixed with Pressure sensitive adhesive tape, after upper electric heating coil to be wrapped
By moving left and right the position of electric heating coil to tear adhesive sticker.After the completion of construction, metal inner lining plate can be firm with repaired mouth piece
Ground bonds together, as an entirety.Metal inner lining plate overlaps end to end when wrapping up in into drum, in order to by overlapping portion
Divide also to be bonded and be integrally formed, the outer surface of metal inner lining plate is stained with adhesive film, 0.05 ~ 0.2mm of thickness in advance.Film
While being flushed with inner layer metal plate end, its excess-three side 5 ~ 20mm narrower than overlapping region, it is therefore an objective to which adhesive overflows when preventing heated
Go out adhesion electric heating coil.
The material of adhesive film is the blending of maleic anhydride grafted polyethylene/polypropylene copolymer and ethylene/polypropylene
Thing, its blending ratio is 1:0~1：10, overall grafting rate reaches that more than 0.1wt% is advisable.
Stirrup material is carbon steel, alloy steel or stainless steel.Stirrup 0.5 ~ 1.5mm of thickness, width is identical with electric heating coil, effectively
Length is unlikely to generation in field joint construction overlapping end to end than electric heating coil excircle 10 ~ 50mm of length.
Stirrup is locked by mechanical locking device end to end, and mechanical locking device includes screw thread locking mechanism, eccentric wheel and locked
Mechanism, inclined-plane retaining mechanism, four rod locking mechanisms etc., preferably use screw thread locking mechanism.When using screw thread locking mechanism, steel
Outer volume encases a connecting rod to hoop respectively end to end, and connecting rod can freely be rotated around axle, facilitates hexagon socket head cap screw connection locking.Spiral shell
Bolt quantity is 3 ~ 9, is evenly distributed on the width of stirrup.Total coupling mechanism force computer capacity as follows：Coupling mechanism force=
（0.25~2.0）The unit of coupling mechanism force is kgf, diameter of steel tube and stirrup width list in × diameter of steel tube × stirrup width, formula
Position is cm.Determine after coupling mechanism force, should be according to selected bolt quantity, thread surface state, lubrication circumstances and relevant design specification
Determine hexagon socket head cap screw specification and screw-down torque.Repaired mouth piece may be diminished by coupling mechanism force after thermal softening in construction, to keep as far as possible
Coupling mechanism force, can be used spring washer or spring.
In step f of the present invention, electric tool Quick fastening hexagon socket head cap screw can be used, regulation is finally fastened to torque-indicating wrencg
Moment of torsion.To reduce influence of the frictional force to moment of torsion, reduce coupling mechanism force fluctuation range, hexagon socket head cap screw should smear lubricating grease.By
During step tightens hexagon socket head cap screw, metal inner lining plate is also accordingly tightened up, between repaired mouth piece and metal inner lining plate and repairing machine
Have and realize between each layer and be brought into close contact.
Electric calorifie installation is covered in stirrup outer layer, is fitted closely with stirrup.The electric calorifie installation can be electric heating coil or electric heating
Piece, preferably electric heating piece.
The width of the electric heating piece is identical with stirrup width, and thickness is 3 ~ 20mm；Electric heating piece is for one piece of entirety or circumferentially
It is divided into 2 ~ 10, adjacent 2 ~ 10mm of two panels interval.It is bent during stirrup is removed after coated metal interior lining panel and completion
Rate can be varied widely, and the electric heating piece for being divided into multi-disc is hardly damaged.Electric heating piece is stainless steel mica heating collar, cast aluminium heating
Circle, cast copper heating collar or stainless ceramic heating collar.The general power of electric heating piece is determined as follows：General power=diameter of steel tube
×（0.02~0.06）, diameter of steel tube unit is mm in formula, and general power unit is kW.
In step f of the present invention, repaired mouth piece coupling mechanism force after by thermal softening may reduce, and can be pulled every 1 ~ 5 minute with dynamometry
Hand is re-secured, and moment of torsion should reach the 30% ~ 90% of regulation initial torque during fastening.
Epoxy primer after the stepb, can be coated uniformly on the whole of repaired mouth position steel pipe by the present invention according to actual conditions
Surface, then wraps repaired mouth piece again on the surface of epoxy primer.Epoxy primer coating can by epoxy primer operating guidance, will
Epoxy primer is circumferentially brushed or sprayed using spraying equipment along pipeline with brush, it is to avoid bubble, epoxy primer is equably applied
Overlay on the whole surface of repaired mouth position steel pipe.If epoxy primer temperature is too low to cause coating inconvenience, can be appropriate by epoxy primer
Heating.In view of the influence of sleet sand and dust in field construction, repaired mouth sheet material is wrapped immediately after coating epoxy primer, thus can
Epoxy primer is avoided to be contaminated during surface drying is waited.
In the case where not needing repaired mouth piece Nian Jie with metal inner lining plate, repaired mouth piece should use double-decker, i.e., above-mentioned
The outer layer of repaired mouth piece applies layer of polyethylene/polypropylene in addition, and its thickness is 0.1 ~ 0.5mm.
The present invention compared with prior art, has the following advantages that：
1st, metal inner lining plate antirust ability is strong, and is integrated with repaired mouth piece strong bond, and greatly improving repaired mouth layer pair can
See the barrier of light, ultraviolet light, water, oxygen and vapor, the resistance to sharp objects mechanical damage is also strengthened, repaired mouth
The layer life-span is substantially improved.
2. the present invention locks pressurization using stirrup, immense pressure can be applied in softening bonding process to repaired mouth piece, greatly
Width improves the adhesive strength to steel pipe；23 DEG C of peel strength can reach more than 250N/cm, and 50 DEG C of peel strength reaches 100
More than N/cm, respectively heat shrinking sleeve（Band）2 times of repaired mouth and more than 5 times；
3. using the construction technology of the present invention, repaired mouth structure is similar with straight tube 2LPE, 2LPP anti-corrosion layer structure, repaired mouth piece
Itself keeps thermoplasticity, can be integral with the prefabricated anticorrosive coat surface layer in two ends and the fusion completely of itself lap-joint of repaired mouth piece, sealing
Effect is fabulous；
4. the repaired mouth equipment of the present invention, fusing and bonding for repaired mouth piece provide stably and controllable temperature and pressure condition,
Construction quality is good, and quality stability is high；
5. the repaired mouth equipment of the present invention is simple and reliable, with low cost, operating expenses is low；
6. the repaired mouth piece of the present invention is without crosslinking with radiation, with low cost, leftover pieces can be recycled, free from environmental pollution.
Brief description of the drawings
The in running order schematic diagram of repaired mouth equipments of the Fig. 1 used in jointing method of the present invention;
Wherein, the repaired mouth piece of 1 electric calorifie installation, 2 screw thread locking mechanism, 3 stirrup, 4 metal inner lining plate 5.
Embodiment
The present invention is further illustrated below by embodiment, following examples are the present invention preferably embodiment party
Formula, but embodiments of the present invention are not limited by following embodiments.
Embodiment 1：
A kind of Ф 610 3LPP pipelines, prefabricated anticorrosive coat thickness 3mm, repaired mouth piece 5 width 400mm, thickness 3.3mm, repaired mouth
Method comprises the following steps：
A. it is surface-treated：Steel tube surface to joint coating on pipeline position is decontaminated and derusting by sandblasting, and steel tube surface quality should
Sa2.5 grades are reached, is immediately removed steel tube surface dust totally with compressed air after derusting by sandblasting；
B. steel pipe is preheated：The steel pipe at joint coating on pipeline position is preheating to 75 DEG C；
C. repaired mouth piece 5 is wrapped：Repaired mouth piece 5 is wrapped at joint coating on pipeline position, the material of repaired mouth piece 5 is polypropylene and maleic acid
The 4 of acid anhydride graft polypropylene copolymer:1 blend, the width of repaired mouth piece 5（Along pipeline axial direction）Centre has circular arc recessed
Groove, groove bosom is 1.5mm, and its width is than the small 2mm of annular weld bead width at weld bond；The width straight portion of repaired mouth piece 5
Length it is consistent with exposed steel pipe minimum length at weld bond, straight portion two ends be uniform thinning area, often hold width be 80mm；Mend
The mouth length direction of piece 5（Along pipeline circumferential direction）The length of straight portion is more than pipeline girth 50mm, and straight portion two ends are same
For uniform thinning area, it is 50mm often to hold length；
D. coated metal interior lining panel 4：Metal inner lining plate 4 is wrapped on repaired mouth piece 5, the outer surface of metal inner lining plate 4 is pre-
First it is stained with adhesive film, thickness 0.1mm；One side of film is flushed with metal inner lining plate end, and overlay region is compared on its excess-three side
The narrow 10mm in domain；The material of adhesive film is the 4 of polypropylene and maleic anhydride inoculated polypropylene copolymer:1 blend；
E. wrap up and lock stirrup 3 and electric calorifie installation 1：Stirrup 3 is wrapped in outside metal inner lining plate 4, stirrup 3 passes through end to end
Screw thread locking mechanism 2 is locked, and electric calorifie installation 1 is covered in the outer layer of stirrup 3, is fitted closely with stirrup 3；
F. temperature programmed control：Switch on power, temperature controller setting value is adjusted to 240 DEG C, keep 25min.；Heating power supply is cut off, is delayed
Slow cool down is to less than 50 DEG C；
G. equipment is removed：Hexagon socket head cap screw is unclamped, stirrup 3 and electric calorifie installation 1 is removed.
The metal inner lining plate 4 of the present invention is wrapped in outside repaired mouth piece 5 into drum, is partly overlapped end to end.Metal inner lining plate 4
Length be 2000mm, width 500mm, thickness 0.3mm, material selection 304-1/2H stainless steel cold-rolled plates.Metal inner lining wrench
The advance metal plate in tail two ends shape in the arc-shaped, arc radius is 305mm, and two ends radian is all 35o.
Stirrup 3 is wrapped in outside metal inner lining plate 4, and material is 304-1/2H stainless steel cold-rolled plates.Stirrup 3 thickness 0.5mm, it is wide
450mm is spent, length is 1945mm.
Stirrup 3 is locked by screw thread locking mechanism 2 end to end, and bolt quantity is 5, is evenly distributed on the width side of stirrup 1
Upwards.Screw thread performance rate selects 6.8 grades, and surface oxidation treatment scribbles lubricating grease containing molybdenum, and nominal diameter M8, each bolt matches somebody with somebody one
Individual spring washer.Total coupling mechanism force is 3500kgf, and each hexagon socket head cap screw coupling mechanism force is 700kgf, and screw-down torque is 12Nm.
Electric calorifie installation 1 is electric heating piece, and electric heating piece is covered in the outer layer of stirrup 3, fitted closely with stirrup 3.Electric heating piece is by two pieces
Semicircle electric heating piece is constituted, and 6mm is spaced between semicircle electric heating piece.The width 450mm of semicircle electric heating piece, thickness is 5mm.
Electric heating piece is stainless steel mica electric heating piece, and general power is 18kW, surfaces externally and internally flat smooth.Power supply be 220V or
The common industrial-frequency alternating currents of 380V.
Embodiment 2：
A kind of Ф 1219 3LPE pipelines, the prefabricated anticorrosive coat thickness 3.7mm in two ends, the width 450mm of repaired mouth piece 5, thickness
4.6mm, jointing method comprises the following steps：
A. it is surface-treated：Steel tube surface to joint coating on pipeline position is decontaminated and derusting by sandblasting, makes steel tube surface quality
Sa2.5 grades are reached, is immediately removed steel tube surface dust totally with compressed air after derusting；
B. steel pipe is preheated：The steel pipe at joint coating on pipeline position is preheating to 50 DEG C；
C. repaired mouth piece 5 is wrapped：Repaired mouth piece 5 is wrapped on the surface at joint coating on pipeline position, the material of repaired mouth piece 5 is maleic anhydride
Grafted polyethylene copolymer, grafting rate is 0.25wt%；The width of repaired mouth piece 5（Along pipeline axial direction）There is circular arc centre
Groove, groove bosom is 2.0mm, and its width is than the small 3mm of annular weld bead width at weld bond；The width flat part of repaired mouth piece 5
The length divided is consistent with exposed steel pipe minimum length at weld bond, and straight portion two ends are uniform thinning area, and it is 60mm often to hold width；
The length direction of repaired mouth piece 5（Along pipeline circumferential direction）The length of straight portion is less than pipeline girth 30mm, and straight portion two ends are same
Sample is uniform thinning area, and it is 60mm often to hold length；
D. coated metal interior lining panel 4：Metal inner lining plate 4 is wrapped on repaired mouth piece 5, the outer surface of metal inner lining plate 4 is pre-
First it is stained with adhesive film, thickness 0.05mm；One side of film is flushed with metal inner lining plate end, and overlay region is compared on its excess-three side
The narrow 5mm in domain；The material of adhesive film is maleic anhydride grafted polyethylene copolymer；
E. wrap up and lock stirrup 3 and electric calorifie installation 1：Stirrup 3 is wrapped in outside metal inner lining plate 4, stirrup 3 passes through end to end
Screw thread locking mechanism 2 is locked, and electric calorifie installation 1 is covered in the outer layer of stirrup 3, is fitted closely with stirrup 3；
F. temperature programmed control：Switch on power, temperature controller setting value is adjusted to 200 DEG C, keep 50min.；Can be every 1 ~ 5 minute use
Torque-indicating wrencg is re-secured, and moment of torsion should reach the 30% ~ 90% of regulation initial torque during fastening.Cut off heating power supply, Slow cooling
To less than 50 DEG C；
G. equipment is removed：Hexagon socket head cap screw is unclamped, stirrup 3 and electric calorifie installation 1 is removed.
The metal inner lining plate 4 of the present invention is wrapped in outside repaired mouth piece 5 into drum, is partly overlapped end to end.Metal inner lining plate 4
Length is 3950mm, width 690mm, thickness 0.5mm.The advance metal plate in the two ends shape in the arc-shaped end to end of metal inner lining plate 4, circular arc half
Footpath is 610mm, and two ends radian is all 45o.The type aluminium alloy of 4 material selection of metal inner lining plate 3.
It is outer into cylindrical shape that stirrup 3 is wrapped in metal inner lining plate 4.Material is 316-3/4H stainless steel cold-rolled plates.The thickness of stirrup 3
0.8mm, length is 3868mm.
Stirrup 3 is locked by hexagon socket head cap screw 2 end to end, and bolt quantity is 7, is evenly distributed on the width of stirrup 3
On.Screw thread performance rate selects 8.8 grades, and surface oxidation treatment scribbles lubricating grease containing molybdenum, and nominal diameter M10, each bolt matches somebody with somebody one
Spring washer.Total coupling mechanism force is 7000kgf, and each hexagon socket head cap screw coupling mechanism force is 1000kgf, and screw-down torque is 22Nm.
Electric calorifie installation 1 is electric heating piece, and electric heating piece is covered in the outer layer of stirrup 3, fitted closely with stirrup 3.Electric heating piece is by two pieces
Semicircle electric heating piece is constituted, and 8mm is spaced between semicircle electric heating piece.The width 590mm of semicircle electric heating piece, thickness is 6mm.
Electric heating piece is stainless steel mica electric heating piece, and general power is 40kW, surfaces externally and internally flat smooth.Power supply be 220V or
The common industrial-frequency alternating currents of 380V.
Comparative example 1：
A kind of method for joint coating on pipeline comprises the following steps successively：
A. it is surface-treated：The steel tube surface at joint coating on pipeline position is decontaminated, derusting by sandblasting, reach steel tube surface quality
To Sa2.5 grades, steel tube surface dust is removed totally with compressed air immediately after derusting；
B. surface is preheated：The steel tube surface at joint coating on pipeline position is preheating to 50 ~ 75 DEG C, use with electromagnetic induction electrothermal method
Infrared thermometry meter monitoring temperature by verification, can properly increase preheating temperature when ambient temperature is low；
C. priming is applied：Epoxy primer is coated uniformly on to the whole surface of repaired mouth position steel pipe；
D. thermal shrinkable sleeve repaired mouth：Thermal shrinkable sleeve is coated to repaired mouth position, electric heating is carried out to thermal shrinkable sleeve with intermediate frequency electric heater, electricity
Hot temperature is 140 ~ 160 DEG C, shrinks thermal shrinkable sleeve and is coated to repaired mouth position, and repaired mouth operation is completed, the effect assessment result such as institute of table 1
Show.
Table 1 is each embodiment and the effect assessment result of comparative example joint coating on pipeline
Claims (24)
1. a kind of jointing method, it is characterised in that at least comprise the following steps：
A. it is surface-treated：Steel tube surface to joint coating on pipeline position is decontaminated and derusting by sandblasting；
B. steel pipe is preheated：The steel pipe at joint coating on pipeline position is preheating to 30 ~ 100 DEG C；
C. repaired mouth piece is wrapped：Repaired mouth piece is wrapped on the surface at joint coating on pipeline position, joint coating on pipeline position two ends are prefabricated anti-corrosion
Layer；
D. coated metal interior lining panel：Metal inner lining plate is wrapped on repaired mouth piece, metal inner lining plate is with repaired mouth piece strong bond
One, the length long 20 ~ 120mm of anticorrosive coat girth more prefabricated than two ends, the width 20 ~ 240mm wider than repaired mouth piece of metal inner lining plate are thick
Spend for 0.2 ~ 1.0mm；
E. wrap up and lock stirrup and electric calorifie installation：Stirrup is wrapped in outside metal inner lining plate, stirrup passes through mechanical interlocking end to end
Device is locked, and electric calorifie installation is covered in stirrup outer layer, fitted closely with stirrup；
F. temperature programmed control：Switch on power, temperature controller setting value is adjusted to 180 ~ 260 DEG C, keep 10 ~ 60min.；Cut off heating power supply,
Slowly cool to less than 50 DEG C；
G. equipment is removed：Release mechanism locking device, removes electric calorifie installation and stirrup.
2. jointing method according to claim 1, it is characterised in that：In step b, the mode of preheating is electric heating coil heating,
Electromagnetic induction heating, infrared heating or liquefaction gas flame heating.
3. jointing method according to claim 1, it is characterised in that：For 3LPE anticorrosive coats, the material of the repaired mouth piece
For maleic anhydride grafted polyethylene copolymer and the blend of polyethylene, its blending ratio is 1:0~1:10, overall grafting rate reaches
To more than 0.1wt%；For 3LPP anticorrosive coats, the material of the repaired mouth piece is maleic anhydride inoculated polypropylene copolymer and poly- third
The blend of alkene, its blending ratio is 1:0~1:10, overall grafting rate reaches more than 0.1wt%.
4. jointing method according to claim 1, it is characterised in that：There is circular groove in the middle of repaired mouth piece width,
Groove bosom is 1.0 ~ 3.0mm, and its width is than the repaired mouth position small 0 ~ 5mm of annular weld bead width.
5. jointing method according to claim 4, it is characterised in that：The length and benefit of repaired mouth piece width straight portion
The minimum length of the exposed steel pipe in oral area position is consistent, and straight portion two ends are uniform thinning area, often holds width in 50 ~ 100mm；Mend
The mouth leaf length direction most short 60mm smaller than pipeline girth of straight portion, the most long 100mm more than pipeline girth, straight portion two ends are same
Sample is uniform thinning area, often holds length in 30 ~ 60mm.
6. jointing method according to claim 4, it is characterised in that：The thickness of repaired mouth piece straight portion is that two ends are prefabricated anti-
The 100 ~ 150% of rotten thickness degree.
7. jointing method according to claim 1, it is characterised in that：Metal inner lining wrench tail two ends can metal plate Cheng Yuan in advance
Arc shape, arc radius is identical with steel pipe radius, and two ends radian is respectively 30o ~ 60o.
8. jointing method according to claim 1, it is characterised in that：Metal inner lining sheet material matter be selected from stainless steel, galvanized steel,
One or more in tin-coated steel, aluminum-plated steel, nickel-plated steel, chromium-plated steel, fine aluminium, aluminium alloy, fine copper or copper alloy.
9. jointing method according to claim 1, it is characterised in that：The outer surface of metal inner lining plate is stained with gluing in advance
Agent film, 0.05 ~ 0.2mm of thickness, one side of film is flushed with metal inner lining plate end, and its excess-three side is narrower than overlapping region by 5 ~
20mm。
10. jointing method according to claim 9, it is characterised in that：The material of adhesive film is grafted for maleic anhydride
The blend of polyethylene/polypropylene copolymers and ethylene/polypropylene, its blending ratio is 1:0~1：10, overall grafting rate reaches
More than 0.1wt%.
11. jointing method according to claim 1, it is characterised in that：Stirrup 0.5 ~ 1.5mm of thickness, width is than in metal
Narrow 20 ~ the 100mm of liner plate；5 ~ 50mm of all length of length anticorrosive coat more prefabricated than two ends.
12. jointing method according to claim 11, it is characterised in that：Stirrup material is carbon steel, alloy steel or stainless steel.
13. jointing method according to claim 1, it is characterised in that：Mechanical locking device is screw thread locking mechanism, bias
Take turns retaining mechanism, inclined-plane retaining mechanism or four rod locking mechanisms.
14. jointing method according to claim 13, it is characterised in that：Mechanical locking device is screw thread locking mechanism.
15. jointing method according to claim 14, it is characterised in that：When locking stirrup using screw thread locking mechanism, steel
Outer volume encases a connecting rod to hoop respectively end to end, and connecting rod can freely be rotated around axle, facilitates hexagon socket head cap screw connection locking, spiral shell
Bolt quantity is 3 ~ 9, is evenly distributed on the width of stirrup.
16. jointing method according to claim 15, it is characterised in that：Spring washer can be used when hexagon socket head cap screw is connected
Or spring.
17. the jointing method according to claim any one of 1-16, it is characterised in that：In the inwall weldering of stirrup one of end to end
Connect and extend that long 50 ~ 100mm, width are identical with stirrup, opposite stirrup and metal are stretched into 0.5 ~ 1.0mm of thickness tabletting during installation
Between interior lining panel.
18. jointing method according to claim 1, it is characterised in that：The electric calorifie installation is electric heating coil or electric heating piece.
19. jointing method according to claim 18, it is characterised in that：The electric calorifie installation is electric heating piece.
20. jointing method according to claim 19, it is characterised in that：The width of the electric heating piece and stirrup width phase
Together, thickness is 3 ~ 20mm；Electric heating piece is one piece of entirety or is circumferentially divided into 2 ~ 10, adjacent 2 ~ 10mm of two panels interval.
21. jointing method according to claim 19, it is characterised in that：Electric heating piece is stainless steel mica heating plate, cast aluminium
Heating plate, cast copper heating plate or stainless ceramic heating plate.
22. jointing method according to claim 1, it is characterised in that：After the stepb, epoxy primer is coated uniformly on
The whole surface of repaired mouth position steel pipe, then wraps repaired mouth piece on the surface of epoxy primer.
23. jointing method according to claim 1, it is characterised in that：In step f, torque-indicating wrencg weight was used every 1 ~ 5 minute
New fastening stirrup, moment of torsion should reach the 30% ~ 90% of regulation initial torque during fastening.
24. jointing method according to claim 1, it is characterised in that：Not needing, repaired mouth piece is Nian Jie with metal inner lining plate
In the case of, repaired mouth piece uses double-decker, i.e., apply layer of polyethylene/polypropylene in addition in the outer layer of repaired mouth piece, its thickness
For 0.1 ~ 0.5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410780656.XA CN104633392B (en) | 2014-12-17 | 2014-12-17 | A kind of jointing method |
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| CN201410780656.XA CN104633392B (en) | 2014-12-17 | 2014-12-17 | A kind of jointing method |
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| CN104633392A CN104633392A (en) | 2015-05-20 |
| CN104633392B true CN104633392B (en) | 2017-09-29 |
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| WO2016095766A1 (en) * | 2014-12-17 | 2016-06-23 | 四川金发科技发展有限公司 | Pipeline-joint coating machine, construction method and novel pipeline-joint coating structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3155696B2 (en) * | 1995-12-06 | 2001-04-16 | 日東電工株式会社 | Pipe welding joint coating method |
| GB0716750D0 (en) * | 2007-08-29 | 2007-10-10 | Pipeline Induction Heat Ltd | Improvements in coating pipes |
| CN102277094A (en) * | 2011-07-12 | 2011-12-14 | 绵阳东方特种工程塑料有限公司 | Joint tape for jointing of polyethylene anticorrosive coating of steel pipeline |
| CN203099209U (en) * | 2013-01-28 | 2013-07-31 | 江禹 | Gas pipeline leakage gap isobaric electric hot melting plugging mechanism |
| CN103925455B (en) * | 2014-04-01 | 2016-04-27 | 常州大学 | A kind of water body joint coating on pipeline guard method and structure |
| CN104121452B (en) * | 2014-06-30 | 2016-04-27 | 武汉圣禹排水系统有限公司 | A kind of pipeline leaks outside and repairs pipe |
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