CN105065852A - Construction method for laying pressure penstock inside water tunnel of hydropower station - Google Patents
Construction method for laying pressure penstock inside water tunnel of hydropower station Download PDFInfo
- Publication number
- CN105065852A CN105065852A CN201510307463.7A CN201510307463A CN105065852A CN 105065852 A CN105065852 A CN 105065852A CN 201510307463 A CN201510307463 A CN 201510307463A CN 105065852 A CN105065852 A CN 105065852A
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- Prior art keywords
- spraying
- paint
- penstock
- finish paint
- tunnel
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
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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
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
Abstract
The present invention discloses a construction method for laying pressure penstocks inside a water tunnel of a hydropower station. Manufactured pressure penstocks are first transported to an installation site inside the water tunnel, antiseptic treatment is carried out on the pressure penstocks at the installation site and comprises a rust removing process and a spraying process, a shot peening method is used for the dust removing process, the grain size of the shots is 0.5-1.5 mm, the surface clearness of the pressure penstocks after rust removal reaches a Sa2.5 grade and above while the surface roughness reaches Ry40-70[mu]m, the spraying process is carried out after the dust removing process and comprises undercoat spraying and finish paint spraying, a solvent-free super-strength wear-resisting epoxy corrosion-prevention undercoat is adopted with the coating thickness being no smaller than 500 [mu]m, a solvent-free super-strength wear-resisting epoxy corrosion-prevention finish paint is adopted with the coating thickness being no smaller than 300 [mu]m, the spraying process is implemented at an environment temperature about 20 DEG C, and a spraying interval of the undercoat and the finish paint is 24 hours. The corrosion prevention quality of the pressure penstocks is ensured, the construction cost can be effectively lowered, and the construction duration is shortened.
Description
Technical field
The present invention relates to the method for construction of laying penstock in the water tunnel of a kind of water power plant, belong to the embedded penstock technical field of construction of hydro.
Background technique
In water conservancy and hydropower and petroleum works, for improving the working life of penstock, reduce the maintenance frequency of steel pipe inner wall, ensure that penstock long-term safety is run, generally all need to carry out anticorrosion to the inside and outside wall of penstock, simultaneously because the flow velocity of liquid in steel pipe is high, corrosion and wearing and tearing can be produced to anti-corrosion material in tube wall, after corrosion, keep in repair difficulty, costly.Therefore, the anti-corrosion measure of careful selection penstock is answered.
The normal anti-corrosion measure adopted at present has:
1, zinc → spray 1 road anti-corrosion primer → spray 2 road antisepsis finishing paints is sprayed.
2, the epoxy spraying 1 road film thickness 70 μm is containing the solvent-free super-strength wear-and corrosion-resistant finish paint of yellow zinc chromate primer paint → spray 3 road film thickness 390 μm.
3, the epoxy spraying 1 road film thickness 50 μm paints → sprays the super-strength wear-and corrosion-resistant finish paint of 2 road film thickness 360 μm containing the anticorrosion mesosphere of the acidproof alkali salt of epoxy of yellow zinc chromate primer paint → spray 2 road film thickness 150 μm.
4, the super-strength wear-and corrosion-resistant finish paint of 2 road film thickness 360 μm is painted → sprays in the epoxy micaceous iron mesosphere containing yellow zinc chromate primer paint → spray 2 road film thickness 150 μm spraying 1 road film thickness 50 μm.
Its construction method step is as follows:
The non-destructive inspection of penstock making → penstock inner surface treatment → penstock anticorrosive coat spraying → anticorrosive coat protection → penstock installation → anticorrosive coat and benefit wound.
Current anti-corrosion measure and method of construction all require that penstock is after steel pipe processing site carries out preservative treatment, again penstock is transported in tunnel and installs, need carry out repeatedly spraying application and the inspection of anti-corrosion material during construction, the construction period is relatively long, complicated organization; And transport in usually damage is caused to completed anticorrosive coat, anticorrosive coat integrity is subject to certain destruction, need carry out secondary preservative treatment, anticorrosion scope and effect undesirable.Also to there is efficiency low for existing anti-corrosion measure and method of construction in addition, and after having constructed or steel pipe cross water after painted surface there is the possibility of bubble.
Summary of the invention
The object of the invention is to, the method for construction of laying penstock in the water tunnel of a kind of water power plant is provided, with long in time limit, cost is high, difficulty of construction the is large problem that solve that existing anti-corrosion measure and method of construction exist, thus overcome the deficiencies in the prior art.
Technological scheme of the present invention:
Lay a method of construction for penstock in the water tunnel of water power plant, the method is that the penstock made first is transported to erecting bed in tunnel, carries out preservative treatment in erecting bed to penstock; Preservative treatment comprises rust cleaning and spraying two procedures, and rust cleaning operation adopts shot peening method, and the particle diameter of shot-peening is 0.5 ~ 1.5mm, and the surface cleanness of the penstock after rust cleaning reaches the above standard of Sa2.5 level, and surface roughness reaches Ry40 ~ 70 μm; Carry out spraying process after preservative treatment, spraying process comprises basecoat paint and finish paint spraying, and priming paint adopts the wear-resisting epoxy anticorrosion primer of solvent-free super-strength, and film thickness is not less than 500 μm; Finish paint adopts the wear-resisting Epoxy anti-corrosive finish paint of solvent-free super-strength, and film thickness is not less than 300 μm; Spraying process is in ambient temperature about 20 DEG C enforcement, and the spray time interval of priming paint and finish paint is 24 hours.
In aforementioned method of construction, described priming paint and finish paint by epoxy resin, wear-resisting stuffing, thickening agents and auxiliary agent formulated, and be the canned spray paint of friendship solid of curing agent with elasticity polyamide resin; Non-volatility solvent in canned spray paint.
In aforementioned method of construction, described rust cleaning and spraying two procedures divide two working surfaces to construct, and two working surface distances are not less than 20 meters.
In aforementioned method of construction, after the penstock application cleaning compressed air after described rust cleaning blows off, GPQ6C type airless sprayer is adopted to carry out spraying operation again; Before having sprayed priming paint and having carried out finish paint spraying, also answer cleaning compressed air to blow off; Spraying machine adopts rubber wheel, and when spraying machine moves in penstock, all Work tools and material are forbidden directly dilatory on tube wall.
In aforementioned method of construction, be provided with high-power dehumidifier and ventilation plant in described tunnel, in tunnel, air-flow direction is flowed towards rust cleaning working surface by spray coating operations.
Compared with prior art, the present invention adopts and carry out preservative treatment in tunnel, to effectively prevent in penstock transportation process the damage completing anticorrosive coat, greatly reduces the workload of repairing anticorrosive coat.Due to the relatively good control of temperature in tunnel, priming paint and finish paint natural drying under optimum temperature can be guaranteed, to reach best antiseptic effect, prevent penstock in use anticorrosive coat there are the quality problems of bubble.Anti-corrosion measure of the present invention is simple, and method of construction is practical, advanced rationally, efficient, succinct.Both can ensure anticorrosive quality, and effectively can reduce again construction cost, shorten the construction period.The anti-corrosion measure of more traditional spray zinc+priming paint+finish paint can save a large amount of zinc material, and quality is easy to control, and has significant Social benefit and economic benefit.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but not as any limitation of the invention.
The method of construction of penstock is laid in the water tunnel of a kind of water power plant, the method of construction of penstock is laid in the water tunnel of a kind of water power plant, the method is that the penstock made first is transported to erecting bed in tunnel, carries out preservative treatment in erecting bed to penstock; Preservative treatment comprises rust cleaning and spraying two procedures, and rust cleaning operation adopts shot peening method, and the particle diameter of shot-peening is 0.5 ~ 1.5mm, and the surface cleanness of the penstock after rust cleaning reaches the above standard of Sa2.5 level, and surface roughness reaches Ry40 ~ 70 μm; Carry out spraying process after preservative treatment, spraying process comprises basecoat paint and finish paint spraying, and priming paint adopts the wear-resisting epoxy anticorrosion primer of solvent-free super-strength, and film thickness is not less than 500 μm; Finish paint adopts the wear-resisting Epoxy anti-corrosive finish paint of solvent-free super-strength, and film thickness is not less than 300 μm; Spraying process is in ambient temperature about 20 DEG C enforcement, and the spray time interval of priming paint and finish paint is 24 hours.Priming paint and finish paint by epoxy resin, wear-resisting stuffing, thickening agents and auxiliary agent formulated, and be the canned spray paint of friendship solid of curing agent with elasticity polyamide resin; Non-volatility solvent in canned spray paint.Rust cleaning and spraying two procedures divide two working surfaces to construct, and two working surface distances are not less than 20 meters.Be provided with high-power dehumidifier and ventilation plant in tunnel, in tunnel, air-flow direction is flowed towards rust cleaning working surface by spray coating operations.GPQ6C type airless sprayer is adopted to carry out spraying operation again after penstock application cleaning compressed air after rust cleaning blows off; Before having sprayed priming paint and having carried out finish paint spraying, also answer cleaning compressed air to blow off; Spraying machine adopts rubber wheel, and when spraying machine moves in penstock, all Work tools and material are forbidden directly dilatory on tube wall.
Embodiment
Mainly implement in accordance with the following steps during concrete enforcement:
1, the making of penstock and installation
Penstock after specialized produce in factory is good, with carborne to installation ground.Utilize overweight equipment to be unloaded from automobile by penstock, put down gently on light rail or travelling bogie, drawn by winch, be transported to mounting points in tunnel.Concrete operation can adjust according to on-site actual situations.
2, preservative treatment is carried out to penstock inwall
Preservation process is implemented in tunnel.Anti-corrosion measure is as follows: the spraying wear-resisting epoxy anticorrosion primer of the 1 solvent-free super-strength in road (film thickness 500 μm), the more wear-resisting Epoxy anti-corrosive finish paint of the solvent-free super-strength in capable spraying 1 road (film thickness 300 μm) in advance.Recoat interval: 24 hours (ambient temperature about 20 DEG C).Coating technology index: by epoxy resin, wear-resisting stuffing, thickening agents and auxiliary agent formulated, and be that the friendship solid of curing agent is canned with elasticity polyamide resin.Non-volatility solvent, has excellent water resistence and rust protection, good chemical resistance performance and oil resistance, good adhesion, impact resistance, wear resistance.Together, dry paint thickness can reach about 600 μm in Airless spraying.
Owing to being carry out large size anticorrosive work in tunnel, air oxygen detrition in tunnel must be ensured, humidity, dew point meet corrosion protection design requirement, high-power dehumidifier must be arranged in hole, eliminate rust, spray paint and flying dust in hole all can be caused larger, eliminate rust and will produce a large amount of dusts, polluted to prevent the painted surface not having surface drying, rust cleaning and the work of spraying paint can not be carried out simultaneously, in order to reduce the flying dust of rust cleaning generation to the pollution of painted surface, spray paint and should ensure the distance of more than 20m with rust cleaning work, eliminate rust front, after being sprayed on.
3, inner wall surface process
Rust cleaning adopts spray technology, and capital equipment has air compressor, gas holder, husky rifle, husky tank etc., and material is shot-peening, recoverable after sub-sieve.Penstock inner wall surface turbidity test reach the above standard of Sa2.5 level, and surface roughness reaches Ry40 ~ 70 μm.Abrasive Particle Size 0.5 ~ 1.5mm.
4, spraying equipment type selecting
Coating layer method of construction has brushing, roller coating, spraying three kinds, anticorrosion owing to being overall large size, adopts spraying coating process.Adopt GPQ6C type airless sprayer, nozzle 030B30 type.Important technological parameters is as follows: boundary dimension 520mm × 430mm × 670mm; Quality 45kg; Pressure ratio 65: 1; Coating discharge capacity 25L/min; Suction pressure 0.3 ~ 0.6MPa; Air consumption 300 ~ 2500L/min.030B30 type nozzle: flow 3L/min; 30cm place mist fabric width degree 30cm before nozzle.
5, anticorrosive coat construction
After the pretreatment of penstock inwall, not handy hand touches, must not pollute, spraying application should be implemented as early as possible, coating layer construction is carried out after rust cleaning acceptance(check), sprayed coating surface answers no sag, crack performance, before each spraying, painted surface clean pressurized air in upper strata should be cleared up, and carry out the work of lower one deck paint spraying again after being cleared up with grey cutter by the sticky object on sagging and surface, if time interval between layers is oversize, also now should carry out application by after last coating hacking, to ensure the combination force being coated with interlayer.Spraying application environment should higher than 5 DEG C, and penstock inner wall surface is higher than dew point more than 3 DEG C, and relative moisture is less than 85%.Should move with hand-motion spray gun during spraying, accomplish " hand to rifle to, rifle with manually ", avoid hand most motionless, only spray with the swing of spray gun, mobile range is advisable with 0.5 ~ 0.8m.Spray distance 0.3 ~ 0.5m is advisable, if spray distance is too small, coating formation high temperature is when being down to normal temperature, and coating shrinkage stress increases, and can cause coating breaks down, sticks up skin and comes off; Spray is apart from excessive, and the spray coating structure formed loosens (being commonly called as orange skin phenomenon), a large amount of pin-hole phenomena in surface, and steel pipe inner wall paint combination force declines, corrosion resistance declines.During spraying, spray gun should be vertical with steel pipe inner wall, otherwise be difficult to ensure that painting layer is even.If spraying work misoperation, the general high 4m ~ 6m of penstock, the movable chassis that first can make high about a 2.5m ~ 4.5m is used in order to spraying operative.Adopt from top to bottom during spraying, from left to right orderliness mode sprays, and makes that paint is smooth, thickness is even.
6, the protective measure of anticorrosive coat
In order to avoid being destroyed tube wall coating, require that construction equipment must install rubber wheel in pipe, all Work tools and material are forbidden directly dilatory in pipe in transportation process, and complete inspection of constructing is with or without damage.
7, the inspection of anticorrosive coat
Should carry out visual examination after film curing, the defects such as uniformity, no sag, wrinkle, pin hole, crackle are answered on surface, should carry out thickness of dry film mensuration simultaneously.
Claims (5)
1. lay a method of construction for penstock in the water tunnel of water power plant, it is characterized in that: the method is that the penstock made first is transported to erecting bed in tunnel, carries out preservative treatment in erecting bed to penstock; Preservative treatment comprises rust cleaning and spraying two procedures, and rust cleaning operation adopts shot peening method, and the particle diameter of shot-peening is 0.5 ~ 1.5mm, and the surface cleanness of the penstock after rust cleaning reaches the above standard of Sa2.5 level, and surface roughness reaches Ry40 ~ 70 μm; Carry out spraying process after preservative treatment, spraying process comprises basecoat paint and finish paint spraying, and priming paint adopts the wear-resisting epoxy anticorrosion primer of solvent-free super-strength, and film thickness is not less than 500 μm; Finish paint adopts the wear-resisting Epoxy anti-corrosive finish paint of solvent-free super-strength, and film thickness is not less than 300 μm; Spraying process is in ambient temperature about 20 DEG C enforcement, and the spray time interval of priming paint and finish paint is 24 hours.
2. method of construction according to claim 1, is characterized in that: described priming paint and finish paint by epoxy resin, wear-resisting stuffing, thickening agents and auxiliary agent formulated, and be the canned spray paint of friendship solid of curing agent with elasticity polyamide resin; Non-volatility solvent in canned spray paint.
3. method of construction according to claim 1, is characterized in that: described rust cleaning and spraying two procedures divide two working surfaces to construct, and two working surface distances are not less than 20 meters.
4. method of construction according to claim 1, is characterized in that: adopt GPQ6C type airless sprayer to carry out spraying operation again after the penstock application cleaning compressed air after described rust cleaning blows off; Before having sprayed priming paint and having carried out finish paint spraying, also answer cleaning compressed air to blow off; Spraying machine adopts rubber wheel, and when spraying machine moves in penstock, all Work tools and material are forbidden directly dilatory on tube wall.
5. method of construction according to claim 1, is characterized in that: be provided with high-power dehumidifier and ventilation plant in described tunnel, and in tunnel, air-flow direction is flowed towards rust cleaning working surface by spray coating operations.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105464060A (en) * | 2015-12-08 | 2016-04-06 | 中国水利水电第十四工程局有限公司 | Supporting leg and iron shoe transportation construction method of inner-hole pressure steel pipe |
| CN109084602A (en) * | 2018-06-28 | 2018-12-25 | 新疆华泰重化工有限责任公司 | A method of improving the tubular heat exchanger cycle of operation |
| CN113601400A (en) * | 2021-07-08 | 2021-11-05 | 南京钢铁股份有限公司 | Pretreatment process and inspection method suitable for hot spraying aluminum on surface of steel plate |
| CN114059836A (en) * | 2021-12-02 | 2022-02-18 | 安徽陶博士环保科技有限公司 | Low-difficulty construction method of nano ceramic anticorrosive coiled material |
| CN115445886A (en) * | 2022-10-10 | 2022-12-09 | 邵海波 | Petrochemical pipeline polymer spraying construction repair process |
| CN116265132A (en) * | 2021-12-16 | 2023-06-20 | 包头北方创业有限责任公司 | Method for treating surface of workpiece |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115445886A (en) * | 2022-10-10 | 2022-12-09 | 邵海波 | Petrochemical pipeline polymer spraying construction repair process |
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| CN105065852B (en) | 2017-05-17 |
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