CN105065852B - 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
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- CN105065852B CN105065852B CN201510307463.7A CN201510307463A CN105065852B CN 105065852 B CN105065852 B CN 105065852B CN 201510307463 A CN201510307463 A CN 201510307463A CN 105065852 B CN105065852 B CN 105065852B
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- 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
-
- 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 lay the construction method of penstock in a kind of power station water tunnel, belong to hydro and bury
Concealed penstock technical field of construction.
Background technology
It is the service life for improving penstock in water conservancy and hydropower and petroleum works, reduces the maintenance time of steel pipe inner wall
Number, it is ensured that penstock long-term safety is run, and be typically necessary carries out anti-corrosion to the inside and outside wall of penstock, simultaneously because steel pipe
The flow velocity of middle liquid is high, and corrosion and abrasion can be produced to anti-corrosion material in tube wall, keeps in repair difficult, costly after corrosion.Therefore, Ying Shen
Reselection procedure penstock anti-corrosion measure.
At present frequently with anti-corrosion measure have：
1st, the road anti-corrosion primer of zinc → spraying 1 → road antisepsis finishing paint of spraying 2 is sprayed.
2nd, the epoxy for spraying 70 μm of 1 road film thickness is solvent-free superpower containing 390 μm of 3 road film thickness of yellow zinc chromate primer paint → spraying
Degree wear-and corrosion-resistant finish paint.
3rd, the epoxy acid and alkali-resistance of the epoxy containing 150 μm of 2 road film thickness of yellow zinc chromate primer paint → spraying of 50 μm of 1 road film thickness is sprayed
Paint → spray the super-strength wear-and corrosion-resistant finish paint of 360 μm of 2 road film thickness in salt anti-corrosion intermediate layer.
4th, the epoxy micaceous iron intermediate layer containing 150 μm of 2 road film thickness of yellow zinc chromate primer paint → spraying of 50 μm of 1 road film thickness is sprayed
The super-strength wear-and corrosion-resistant finish paint of paint → 360 μm of 2 road film thickness of spraying.
Its construction method step is as follows：
Penstock making → penstock inner surface treatment → penstock anticorrosive coat spraying → anticorrosive coat protection → pressure
The Non-Destructive Testing of power penstock installation → anticorrosive coat and benefit wound.
Current anti-corrosion measure and construction method is required to penstock and carries out preservative treatment in steel pipe processing site to finish
Afterwards, then penstock is transported and is installed to tunnel, spraying application and the inspection of multiple anti-corrosion material need to be carried out during construction,
Construction period is relatively long, complicated organization；And damage, anticorrosive coat entirety are often resulted in completed anticorrosive coat in transporting
Property is necessarily destroyed, and need to carry out secondary preservative treatment, and anti-corrosion scope and effect are undesirable.Existing anti-corrosion measure and apply in addition
Work method also has that efficiency is low, and after the completion of constructing or steel pipe crosses the possibility that bubble occurs in painted surface after water.
The content of the invention
It is an object of the present invention to provide the construction method of penstock is laid in a kind of power station water tunnel, to solve
The big problem of certainly existing anti-corrosion measure and the long in time limit of construction method presence, high cost, difficulty of construction, so as to overcome prior art
Deficiency.
Technical scheme：
The construction method of laying penstock in a kind of power station water tunnel, the method is the penstock that will be made
Erecting bed in tunnel is first transported to, preservative treatment is carried out to penstock in erecting bed；Preservative treatment includes rust cleaning and sprays
Two procedures, rust cleaning operation adopts shot peening method, and the particle diameter of shot-peening is 0.5~1.5mm, the surface of the penstock after rust cleaning
Cleannes reach Sa2.5 level above standards, and surface roughness reaches Ry40~70 μm；Spraying process is carried out after preservative treatment,
Spraying process includes that basecoat paint and finish paint are sprayed, and priming paint adopts the wear-resisting epoxy anticorrosion primer of solvent-free super-strength, film thickness
Not less than 500 μm；Finish paint adopts the wear-resisting Epoxy anti-corrosive finish paint of solvent-free super-strength, film thickness to be not less than 300 μm；Spraying process
In 20 DEG C or so enforcements of ambient temperature, priming paint is 24 hours with the spray time interval of finish paint.
In aforementioned construction method, the priming paint and finish paint by epoxy resin, wear-resisting inserts, thickening agents and auxiliary agent prepare and
Into, and with the canned spray paint of friendship solid that elastic polyamide is firming agent；Non-volatility solvent in canned spray paint.
In aforementioned construction method, the rust cleaning and spraying two procedures are divided to two work surfaces to be constructed, two work surfaces
Distance is not less than 20 meters.
In aforementioned construction method, the penstock application cleaning compressed air after the rust cleaning adopts again GPQ6C after blowing off
Type airless sprayer carries out spraying operation；Cleaning compressed air is also answered to blow off before having sprayed priming paint and having carried out finish paint spraying；Flush coater
Using rubber wheel, when flush coater is moved in penstock, all Work tools and material are forbidden directly to draw on tube wall.
In aforementioned construction method, high-power dehumidifier and ventilation unit are installed in the tunnel, air flow in tunnel
Direction is by spray coating operations towards rust cleaning work surface flowing.
Compared with prior art, the present invention effectively prevent penstock transport using preservative treatment is carried out in tunnel
During to completing the damage of anticorrosive coat, greatly reduce the workload for repairing anticorrosive coat.Because temperature is relatively good in tunnel
Control, it can be ensured that priming paint and finish paint are spontaneously dried under optimum temperature, to reach optimal antiseptic effect, prevent penstock from existing
There are the quality problems of bubble in anticorrosive coat during use.Anti-corrosion measure of the present invention is simple, construction method is practical, it is advanced rationally,
Efficiently, succinctly.Both anticorrosive quality can have been ensured, construction cost can have effectively been reduced again, is shortened the construction period.More traditional spray zinc+priming paint+
The anti-corrosion measure of finish paint can save a large amount of zinc materials, and quality is easily controllable, with significant Social benefit and economic benefit.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but not as any limitation of the invention.
The construction method of laying penstock in a kind of power station water tunnel, laying pressure in a kind of power station water tunnel
The construction method of power steel pipe, the method is that the penstock that will be made first is transported to erecting bed in tunnel, in erecting bed pair
Penstock carries out preservative treatment；Preservative treatment includes the two procedures that eliminate rust and spray, and rust cleaning operation adopts shot peening method, spray
The particle diameter of ball is 0.5~1.5mm, and the surface cleanness of the penstock after rust cleaning reaches Sa2.5 level above standards, rough surface
Degree reaches Ry40~70 μm；Spraying process is carried out after preservative treatment, spraying process includes that basecoat paint and finish paint are sprayed, priming paint
Using the wear-resisting epoxy anticorrosion primer of solvent-free super-strength, film thickness is not less than 500 μm；Finish paint is wear-resisting using solvent-free super-strength
Epoxy anti-corrosive finish paint, film thickness is not less than 300 μm；Spraying process is in 20 DEG C or so enforcements of ambient temperature, priming paint and finish paint
Spray time interval is 24 hours., by epoxy resin, wear-resisting inserts, thickening agents and auxiliary agent are formulated for priming paint and finish paint, and
With the canned spray paint of friendship solid that elastic polyamide is firming agent；Non-volatility solvent in canned spray paint.Rust cleaning and spray
Applying two procedures is divided to two work surfaces to be constructed, and two work surface distances are not less than 20 meters.High-power removing is installed in tunnel
Wet machine and ventilation unit, air-flow direction is flowed by spray coating operations towards rust cleaning work surface in tunnel.Pressure steel after rust cleaning
Pipe application cleaning compressed air carries out spraying operation using GPQ6C types airless sprayer again after blowing off；Face is carried out priming paint has been sprayed
Cleaning compressed air is also answered to blow off before paint spraying；Flush coater adopts rubber wheel, when flush coater is moved in penstock, Suo Yougong
Utensil and material are forbidden directly to draw on tube wall.
Embodiment
Implement essentially according to following steps when being embodied as：
1st, the making and installation of penstock
Penstock after professional chemical plant is made, with carborne to install ground.Using overweight equipment by pressure steel
Pipe is unloaded from automobile, is put down gently on light rail or travelling bogie, by elevator machine travel, is transported to mount point in tunnel.Concrete work
Sequence can be adjusted according to on-site actual situations.
2nd, preservative treatment is carried out to penstock inwall
Preservation process is implemented in tunnel.Anti-corrosion measure is as follows：The wear-resisting epoxy of the solvent-free super-strength in 1 road is sprayed in advance
Anti-corrosion primer (500 μm of film thickness), then the wear-resisting Epoxy anti-corrosive finish paint (μ of film thickness 300 of the solvent-free super-strength in 1 road of row spraying
m).Recoating interval：24 hours (20 DEG C or so of ambient temperature).Coating technology index：By epoxy resin, wear-resisting inserts increase and adjust
Agent and auxiliary agent are formulated, and canned with the friendship solid that elastic polyamide is firming agent.Non-volatility solvent, with excellent
Resistance to water and rust-preventing characteristic, good chemical resistance performance and oil resistivity, good adhesive force, resistance to impact, wearability.Depletion of QI
Together, Resina Toxicodendri film thickness can reach 600 μm or so for spraying.
Due to being that large area anticorrosive work is carried out in tunnel, it is necessary to assure be air-dried in tunnel, humidity, dew point meet
Corrosion protection design requires, must arrange high-power dehumidifier in hole, and rust cleaning, spray painting can all cause in hole flying dust than larger, and rust cleaning will
Produce substantial amounts of dust, in order to prevent the painted surface without surface drying to be contaminated, eliminate rust and paint work can not while carry out,
In order to reduce pollution of the flying dust of rust cleaning generation to painted surface, spray painting should ensure that the distance of more than 20m, rust cleaning with rust cleaning work
Front, after being sprayed on.
3rd, inner wall surface is processed
Rust cleaning adopts spray technology, capital equipment to have air compressor, air accumulator, husky rifle, husky tank etc., and material is shot-peening,
Recoverable after sub-sieve.Penstock inner wall surface cleannes reach Sa2.5 level above standards, and surface roughness reaches Ry40
~70 μm.0.5~1.5mm of Abrasive Particle Size.
4th, spraying equipment type selecting
Dope layer construction method has brushing, roller coating, three kinds of spraying, due to being overall large area anti-corrosion, using spraying coating process.
Using GPQ6C type airless sprayers, nozzle 030B30 types.Important technological parameters are as follows：Overall dimensions 520m m × 430mm ×
670mm；Quality 45kg；Pressure ratio 65: 1；Coating discharge capacity 25L/min；0.3~0.6MPa of admission pressure；Specific air consumption 300~
2500L/min.030B30 type nozzles：Flow 3L/min；Mist fabric width degree 30cm at 30cm before nozzle.
5th, anticorrosive coat construction
After penstock inwall pretreatment, not handy handss are touched, and must not be polluted, and should as early as possible implement spraying application, and rust cleaning is tested
Fold and carry out after lattice dope layer construction, sprayed coating surface answers no sag, crack performance, before spraying every time, upper strata should be painted
Surface is cleared up with clean compressed air, and carries out down again after the sticky object on sagging and surface is cleared up with grey knife
One layer of paint spraying work, if time interval between layers are oversize, will also should now carry out application after previous coating hacking, to ensure to apply
The adhesion of interlayer.Spraying application environment should be higher than that 5 DEG C, and penstock inner wall surface is higher than more than 3 DEG C of dew point, and relative humidity is little
In 85%.Should be moved with hand-motion spray gun during spraying, be accomplished " handss are arrived to rifle, rifle with manually ", it is motionless most to avoid handss, only with spray gun
Swing is sprayed, and mobile range is advisable with 0.5~0.8m.0.3~0.5m of spray distance is advisable, if spray distance is too small, applies
Layer forms high temperature when room temperature is down to, the increase of coating shrinkage stress, can cause coating breaks down, sticks up skin and comes off；Spray base is excessive, institute
The spray coating structure loose (being commonly called as orange peel phenomenon) of formation, a large amount of pin-hole phenomenas in surface, steel pipe inner wall paint adhesion decline,
Corrosion resistance declines.Spray gun should be vertical with steel pipe inner wall during spraying, otherwise it is difficult to ensure that painting layer is uniform.If spraying work
Misoperation, the general high 4m~6m of penstock can first make the movable chassis of a high 2.5m~4.5m or so in case spraying work
People's operation is used.Using from top to bottom during spraying, from left to right orderliness mode is sprayed, and makes that paint is smooth, thickness is equal
It is even.
6th, the protective measure of anticorrosive coat
In order to avoid being destroyed to tube wall coating, it is desirable to which construction equipment must install rubber wheel, all work devices in pipe
It is directly dilatory in pipe that tool and material are forbidden in transportation, and construction finishes and checks for damaging.
7th, the inspection of anticorrosive coat
Visual examination should be carried out after film curing, the defects such as uniformity, no sag, wrinkle, pin hole, crackle are answered on surface,
Simultaneously build measure should be carried out.
Claims (1)
1. the construction method of penstock is laid in a kind of power station water tunnel, it is characterised in that：The method is to make
Penstock be first transported to erecting bed in tunnel, preservative treatment is carried out to penstock in erecting bed；Preservative treatment includes
Rust cleaning and two procedures are sprayed, rust cleaning operation adopts shot peening method, the particle diameter of shot-peening is 0.5~1.5mm, the pressure after rust cleaning
The surface cleanness of steel pipe reaches Sa2.5 level above standards, and surface roughness reaches Ry40~70 μm；Carry out after processing of rust removing
Spraying process, spraying process includes that basecoat paint and finish paint are sprayed, and priming paint adopts the wear-resisting epoxy anticorrosion primer of solvent-free super-strength,
Film thickness is not less than 500 μm；Finish paint adopts the wear-resisting Epoxy anti-corrosive finish paint of solvent-free super-strength, film thickness to be not less than 300 μm；
Spraying process is 24 hours with the spray time interval of finish paint in 20 DEG C or so enforcements of ambient temperature, priming paint；Priming paint and finish paint by
Epoxy resin, wear-resisting inserts, thickening agents and auxiliary agent are formulated, and with the friendship solid tank that elastic polyamide is firming agent
Dress spray paint；Non-volatility solvent in canned spray paint；Rust cleaning and spraying two procedures are divided to two work surfaces to be constructed, two
Work surface distance is not less than 20 meters；Penstock application cleaning compressed air after rust cleaning adopts again GPQ6C type depletion of QI after blowing off
Flush coater carries out spraying operation；Also blow off using cleaning compressed air before having sprayed priming paint and having carried out finish paint spraying；Flush coater is adopted
Rubber wheel, when flush coater is moved in penstock, all Work tools and material are forbidden directly to draw on tube wall；In tunnel
High-power dehumidifier and ventilation unit are installed, air-flow direction is flowed by spray coating operations towards rust cleaning work surface in tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307463.7A CN105065852B (en) | 2015-06-08 | 2015-06-08 | Construction method for laying pressure penstock inside water tunnel of hydropower station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307463.7A CN105065852B (en) | 2015-06-08 | 2015-06-08 | Construction method for laying pressure penstock inside water tunnel of hydropower station |
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| CN105065852A CN105065852A (en) | 2015-11-18 |
| CN105065852B true CN105065852B (en) | 2017-05-17 |
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Families Citing this family (6)
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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 |
| CN116265132B (en) * | 2021-12-16 | 2024-02-09 | 包头北方创业有限责任公司 | Method for treating surface of workpiece |
| CN115445886A (en) * | 2022-10-10 | 2022-12-09 | 邵海波 | Petrochemical pipeline polymer spraying construction repair process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101607247B (en) * | 2009-07-15 | 2012-01-18 | 史岳明 | Automatic coating technology of large-scale steel pipe anticorrosion coating and production line thereof |
| CN202132654U (en) * | 2011-06-29 | 2012-02-01 | 湖北嘉裕管业股份有限公司 | Antiseptic petroleum pipeline |
| CN103062575A (en) * | 2013-01-24 | 2013-04-24 | 林泊成 | Heat-insulation joint coating process for underground oil and gas pipelines in high and cold regions |
| CN104553108A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Antiseptic thermal-insulation wear-resisting composite coating and pipeline |
| CN104633390A (en) * | 2013-11-13 | 2015-05-20 | 青岛旭升封头有限公司 | Antiseptic treatment technology for outer surface of water conveying steel pipe |
| CN103672299B (en) * | 2013-12-05 | 2017-03-08 | 浙江波威钢构有限公司 | The transport pipeline that a kind of chemical industry uses |
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