CN104139283A - Method for manufacturing pressure backfilling type pipeline - Google Patents
Method for manufacturing pressure backfilling type pipeline Download PDFInfo
- Publication number
- CN104139283A CN104139283A CN201410377157.6A CN201410377157A CN104139283A CN 104139283 A CN104139283 A CN 104139283A CN 201410377157 A CN201410377157 A CN 201410377157A CN 104139283 A CN104139283 A CN 104139283A
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- welding
- steel plate
- pipeline
- carry out
- pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a method for manufacturing a pressure backfilling type pipeline. The method for manufacturing the pressure backfilling type pipeline comprises the following steps that firstly, the pipeline is prefabricated, wherein after steel plates are marked, the steel plates are cut, and chamfering is conducted; secondly, the steel plates are coiled into pipes in a cold coiling mode; thirdly, pipes and connected and welded, wherein coiled single-section pipes are placed on multiple supporting rollers on a trolley to be connected, and after preheating, the pipes are connected through electric-arc welding or union melt welding; fourthly, anticorrosion treatment is conducted, wherein anti-rust pretreatment is conducted on the surfaces of the pipes through a shot blasting method, and then anti-corrosion treatment is conducted. In this way, the method for manufacturing the pressure backfilling type pipeline can be effectively applied to flexible embedding; the pipeline is allowed to deform freely in the backfilling process, so that stress is released; in addition, the practicability is high, and the method is suitable for the environment with broken rock, a thick covering layer and uneven terrain.
Description
Technical field
The present invention relates to the technical field that pipeline is made, relate in particular to a kind of preparation method of pressure backfill type pipeline.
Background technology
Along with improving constantly of people's living standard, various capital constructions are also more and more, as power station etc., although this capital construction is for mankind's service, but in order to realize such capital construction, often need to carry out pipeline construction, both utilized required pipeline to realize water, the conveying of circuit etc. and transportation, but along with the progressively attention of people to environment, equally also wish that this capital construction can reduce the impact on environment as much as possible, and, in pipeline construction, due to circumstance complication, physical features is uneven, be uneven, also to pipe laying, construction has proposed more and more higher requirement.
In order to realize pipeline, fix and construct, taking into account protection of the environment and vegetation simultaneously, designers solve this problem by backfill type soft-constraint pipe laying method.
But this construction method is had relatively high expectations to pipeline, not only need the pressure that coupling is larger, also need to bear more complicated stressing conditions, this just has higher requirement to pipeline.
For this reason, designer of the present invention is because above-mentioned defect, by concentrating on studies and designing, is comprehensively engaged in for a long time experience and the achievement of related industry for many years, and research and design goes out a kind of preparation method of pressure backfill type pipeline, to overcome above-mentioned defect.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the defect of prior art, a kind of preparation method of pressure backfill type pipeline is provided, can adapt to the requirement of backfill type soft-constraint pipe laying method, accommodation is wider, has more practicality.
For addressing the above problem, the invention discloses a kind of preparation method of pressure backfill type pipeline, it is characterized in that comprising following steps:
Step 1: pipe prefabrication
Steel plate is rule, after line, carry out cutting and the bevel of steel plate, when steel plate thickness is not more than 22mm, adopt single " V " type groove, when steel plate thickness is greater than or be greater than 22mm, weld groove is symmetrical " X " type groove, to realize the accurate location of steel plate in follow-up welding;
Step 2: be wound into pipe
By cold coiling mode, steel plate is wound into pipe, it adopts two 630t steel plate starting the arc forcing presses to the prefabricated radian in steel plate termination;
In coiling, must carry out according to following requirement:
Roll bending direction is consistent with the rolling direction of steel plate, to destroy the inside character of steel plate in avoiding reeling again;
After rolling shaping, carry out curvature correction;
Step 3: connection section welding
By winding single-unit pipe be placed on the section of connection on a plurality of support rollers of chassis, by each support roller in same elevation plane to guarantee tube coupling linearity, the inside of described pipeline is provided with support member, so that penstock keeps circularity in welding;
Then carry out weld preheating, adopt crawler type heating plate butt welded seam to carry out preheating, preheating width is weld seam and each 3 times of thicknesss of slab of both sides, center and is not less than 150mm, 100 ℃～120 ℃ of preheat temperatures;
After preheating, adopt arc welding or Lincoln weld to weld, welding procedure is: speed of welding is 80mm/min, and weldingvoltage is 30V, and hot input control is at 2700～3500J/mm, and welding current is 130-150A, so that each pipe joint is welded as to integrated piping;
Step 4: preservative treatment
First by ball blasting method effects on surface, carry out antirust pretreatment, after pretreatment, at inner-walls of duct, carry out anticorrosion, due to the direct contact liq of inwall, therefore brushing twice epoxy resin coating on inwall, between twice brushing, interval is 2 hours, film thickness 500 μ m are then wound around anticorrosion adhesive tape, derusting grade Sa2.0 level after pipeline outer wall is coated with priming.
Wherein: in the welding preheating of the step 3 line pipe road that advances, pre-fix, after pipeline is fixing, carrying out periphery spot welding fixes, to realize connection between any two, thereby make follow-up welding more firm, the longitudinal joint counterpart dislocation limit deviation in 2-section pipe road is not more than 10%, and be not more than 2mm, uneven place is used and presses code, chock to flatten.
Known by said structure, the preparation method of pressure backfill type pipeline of the present invention has following technique effect:
(1) pressure pipeline can effectively be applied to flexibility and imbeds, and allows pipeline Free Transform in backfill, to discharge stress;
(2) applicability is strong, and pipeline is applicable to catalase, covers bed thickness, the environment of physical features inequality;
(3) less demanding to ground, can shorten the digging time of pressure pipeline greatly.
Detailed content of the present invention can obtain by explanation described later and institute's accompanying drawing.
Accompanying drawing explanation
Fig. 1 has shown the front view of the present invention's section of connection welding.
Fig. 2 has shown the side view of the present invention's section of connection welding.
The specific embodiment
The preparation method of pressure backfill type pipeline of the present invention comprises following steps:
Step 1: pipe prefabrication
Steel plate is rule, and meeting a pipe joint road can only have a longitudinal seam line, and the longitudinal seam line of adjacent tube coupling should stagger more than 300mm.
After line, mark the numbering of duct segments, merogenesis, piecemeal, water (flow) direction, horizontal and vertical center line, the symbols such as bevel angle and line of cut.
After line, carry out cutting and the bevel of steel plate, must not use electric arc cutting, when steel plate thickness is not more than 22mm, adopt single " V " type groove, when steel plate thickness is greater than or be greater than 22mm, weld groove is symmetrical " X " type groove, to realize the accurate location of steel plate in follow-up welding;
Step 2: be wound into pipe
By cold coiling mode, steel plate is wound into pipe, it adopts two 630t steel plate starting the arc forcing presses to the prefabricated radian in steel plate termination.
By continuous discovery, in coiling, must carry out according to following requirement:
Roll bending direction is consistent with the rolling direction of steel plate, to destroy the inside character of steel plate in avoiding reeling again;
After rolling shaping, carry out curvature correction.
Step 3: connection section welding
By winding single-unit pipe be placed on the section of connection on a plurality of support rollers 12 of chassis 11 as shown in Figure 1, 2, by each support roller 12 in same elevation plane to guarantee tube coupling linearity, the inside of described pipeline is provided with support member 13, described support member 13 comprises annulus and is arranged at a plurality of jack of annulus outer peripheral edges, described a plurality of jack radially outward extends from annulus outer peripheral edges equi-spaced apart, so that pipeline keeps circularity in welding.
Then carry out weld preheating, adopt crawler type heating plate butt welded seam to carry out preheating, preheating width is weld seam and each 3 times of thicknesss of slab of both sides, center and is not less than 150mm, 100 ℃～120 ℃ of preheat temperatures.
After preheating, adopt arc welding or Lincoln weld to weld, welding process is in strict accordance with pressing sweating heat input formula in ASME IX:
Welding procedure is: speed of welding is 80mm/min, and weldingvoltage is 30V, and hot input control is at 2700～3500J/mm, and welding current is 130-150A, so that each pipe joint is welded as to integrated piping.
Step 4: preservative treatment
First by ball blasting method effects on surface, carry out antirust pretreatment, by air compressor machine air feed, compressed air after filtration, except deoiling, water, pressure 0.6Mpa, 60 °～70 ° of jet angles, jet length 100～200mm, wherein, after pipeline rust cleaning, with dry compressed air, blow off, if find, surface contamination should re-start processing.
After pretreatment, at inner-walls of duct, carry out anticorrosion, due to the direct contact liq of inwall, therefore brushing twice epoxy resin coating on inwall, between twice brushing, interval is 2 hours, film thickness 500 μ m.
Then after being coated with priming, pipeline outer wall is wound around anticorrosion adhesive tape, derusting grade Sa2.0 level.
ST Epoxy Mastic epoxy resin coating and Densopol 80HTMarine Tape anticorrosion adhesive tape that anti-corrosion material adopts DensoLtd company to produce.
Wherein, the painting layer smooth surface of brushing, color uniformity, without defects such as elephant skin, foaming, sagging, pin hole, crackle, holidays; Cement mortar coating layer thickness is basically identical, and adhesion-tight does not play powdery.Paint thickness is measured with infrared ray paint film thickness gauge.Adhesive tape is wound around anticorrosive coat surface should be smooth, overlap joint evenly, without permanent bubble, fold and breakage.
Optionally, before the welding preheating of step 3, can carry out pipeline pre-fixes, after pipeline is fixing, carrying out periphery spot welding fixes, to realize connection between any two, thereby make follow-up welding more firm, the longitudinal joint counterpart dislocation limit deviation in 2-section pipe road is not more than 10%, and be not more than 2mm, uneven place is used and presses code, chock to flatten.
Pipe applications of the present invention has obtained effective confirmation in the application of the Nan Derui of republic of Fiji Islands vatu (Nadarivatu) Hydropower Project, this Hydropower Project is positioned at the middle and south, Fijian VitiLevu island, 177 ° 49 ' 3 of dam site place east longitude "; 17 ° 18 ' 30, south latitude ", apart from Nadi airport 135km, apart from the about 300km in Suva, capital, this project mainly comprises: barrage, water-carriage system, Power Plant, 132KV switchyard and ultra-high-tension power transmission line, the Main Function of engineering is barrage reservoir impoundment power generation.
By concrete application, adopted after pipeline of the present invention, go through water-filling and built pressure, emptying perforate inspection, the test of the moving discharge special topic of mechanical type rejection of full load, unit rejection of full load run-in test, the moving water running test of long-term set grid-connection commercial off-the-shelf, fully verified that the present invention has obtained success, have the design principle of scientific research and innovation and the value that construction method possesses the application widelyd popularize completely, its technology is ripe, safe and reliable.
Known by said structure, the invention has the advantages that:
(1) pressure pipeline can effectively be applied to flexibility and imbeds, and allows pipeline Free Transform in backfill, to discharge stress;
(2) applicability is strong, and pipeline is applicable to catalase, covers bed thickness, the environment of physical features inequality;
(3) less demanding to ground, can shorten the digging time of pressure pipeline greatly.
It is evident that above description and to record be only for example rather than in order to limit disclosure of the present invention, application or use.Although described in an embodiment and be described in the drawings embodiment, but the optimal mode that the present invention does not limit by accompanying drawing example and the conduct of describing is in an embodiment thought to be at present to implement the specific examples of instruction of the present invention, scope of the present invention will comprise any embodiment of the description that falls into above and appended claim.
Claims (2)
1. a preparation method for pressure backfill type pipeline, is characterized in that comprising following steps:
Step 1: pipe prefabrication
Steel plate is rule, after line, carry out cutting and the bevel of steel plate, when steel plate thickness is not more than 22mm, adopt single " V " type groove, when steel plate thickness is greater than or be greater than 22mm, weld groove is symmetrical " X " type groove, to realize the accurate location of steel plate in follow-up welding;
Step 2: be wound into pipe
By cold coiling mode, steel plate is wound into pipe, it adopts two 630t steel plate starting the arc forcing presses to the prefabricated radian in steel plate termination;
In coiling, must carry out according to following requirement:
Roll bending direction is consistent with the rolling direction of steel plate, to destroy the inside character of steel plate in avoiding reeling again;
After rolling shaping, carry out curvature correction;
Step 3: connection section welding
By winding single-unit pipe be placed on the section of connection on a plurality of support rollers of chassis, by each support roller in same elevation plane to guarantee tube coupling linearity, the inside of described pipeline is provided with support member, so that penstock keeps circularity in welding;
Then carry out weld preheating, adopt crawler type heating plate butt welded seam to carry out preheating, preheating width is weld seam and each 3 times of thicknesss of slab of both sides, center and is not less than 150mm, 100 ℃～120 ℃ of preheat temperatures;
After preheating, adopt arc welding or Lincoln weld to weld, welding procedure is: speed of welding is 80mm/min, and weldingvoltage is 30V, and hot input control is at 2700～3500J/mm, and welding current is 130-150A, so that each pipe joint is welded as to integrated piping;
Step 4: preservative treatment
First by ball blasting method effects on surface, carry out antirust pretreatment, after pretreatment, at inner-walls of duct, carry out anticorrosion, due to the direct contact liq of inwall, therefore brushing twice epoxy resin coating on inwall, between twice brushing, interval is 2 hours, film thickness 500 μ m are then wound around anticorrosion adhesive tape, derusting grade Sa2.0 level after pipeline outer wall is coated with priming.
2. preparation method as claimed in claim 1, it is characterized in that: in the welding preheating of the step 3 line pipe road that advances, pre-fix, after pipeline is fixing, carrying out periphery spot welding fixes, to realize connection between any two, thereby make follow-up welding more firm, the longitudinal joint counterpart dislocation limit deviation in 2-section pipe road is not more than 10%, and is not more than 2mm, and uneven place is used and presses code, chock to flatten.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377157.6A CN104139283B (en) | 2014-08-01 | 2014-08-01 | The preparation method of pressure backfill type pipeline |
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| CN201410377157.6A CN104139283B (en) | 2014-08-01 | 2014-08-01 | The preparation method of pressure backfill type pipeline |
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| CN104139283A true CN104139283A (en) | 2014-11-12 |
| CN104139283B CN104139283B (en) | 2016-05-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106271404A (en) * | 2016-08-15 | 2017-01-04 | 鞍钢重型机械有限责任公司 | A kind of manufacture method of large-scale Water distribution circular pipe |
| CN108817607A (en) * | 2018-07-10 | 2018-11-16 | 湖南机电职业技术学院 | Wind-power electricity generation stake welding procedure |
| CN110625193A (en) * | 2019-09-30 | 2019-12-31 | 中国船舶重工集团柴油机有限公司 | Cutting method, system and processing system for air port of cylindrical scavenging air box |
| CN113352571A (en) * | 2021-05-10 | 2021-09-07 | 叶正炎 | Extrusion end correction type polyvinyl chloride pipe production stub bar processing method |
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| CN1291691A (en) * | 2000-12-11 | 2001-04-18 | 侯贤忠 | Split-type pipe with multi-layer wall and its making method |
| CN101511501A (en) * | 2006-08-31 | 2009-08-19 | 法雷奥热系统公司 | Method for manufacturing a heat exchanger tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106271404A (en) * | 2016-08-15 | 2017-01-04 | 鞍钢重型机械有限责任公司 | A kind of manufacture method of large-scale Water distribution circular pipe |
| CN108817607A (en) * | 2018-07-10 | 2018-11-16 | 湖南机电职业技术学院 | Wind-power electricity generation stake welding procedure |
| CN110625193A (en) * | 2019-09-30 | 2019-12-31 | 中国船舶重工集团柴油机有限公司 | Cutting method, system and processing system for air port of cylindrical scavenging air box |
| CN113352571A (en) * | 2021-05-10 | 2021-09-07 | 叶正炎 | Extrusion end correction type polyvinyl chloride pipe production stub bar processing method |
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| Publication number | Publication date |
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| CN104139283B (en) | 2016-05-25 |
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