CN106287008A - A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe - Google Patents
A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe Download PDFInfo
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- CN106287008A CN106287008A CN201610689026.0A CN201610689026A CN106287008A CN 106287008 A CN106287008 A CN 106287008A CN 201610689026 A CN201610689026 A CN 201610689026A CN 106287008 A CN106287008 A CN 106287008A
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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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/153—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and concrete with or without reinforcement
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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
- F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe, uses the ultra-high performance concrete bonding of high deformability to cover and protection compressor wire, buries steel not corrosion in other, and for internal layer concrete protection.Ultra-high performance concrete used in the present invention possesses the physical and mechanical property of excellence; including high bond strength, high deformation and high anti-crack ability, high tenacity, high-tensile; and high permeability resistant energy, high resist chemical performance and high anti-freezing melt performance superelevation durability; can be that embed-type Prestressed concrete cylinder pipe provides reliable, long-acting anti-corrosion protection; increase substantially durability and the operational reliability of this kind of pipeline, ensure and realize such tubing is laid the desired long service live of pipeline (75～100 years).
Description
Technical field
The present invention relates to a kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe, become in particular by height
The ultra-high performance concrete of shape ability, the long-term not corrosion of steel in protective conduit in corrosive atmosphere, and protection concrete
Inwall is from corrosion in water.
Background technology
Prestressed concrete cylinder pipe (Prestressed Concrete Cylinder Pipe is called for short PCCP) is a kind of
Water transferring line, originates from France, and the forties in last century, America and Europe started development, the eighties start development in China and apply.
PCCP is to be wound around compressor wire by the high-strength concrete tube core of band steel cylinder, then sprays the structure with cement mortar protective course
Become；Welded together with steel bell and spigot and steel cylinder, the groove on bell and spigot and cushion rubber form slidingtype flexible joint.PCCP presses
Structure (steel cylinder position in tube core) is divided into lined Prestressed concrete cylinder pipe (being called for short PCCPL) and embed-type prestressing force
Cylinder concrete pipe (is called for short PCCPE).PCCPL, using thin steel cylinder inner lining concrete as tube core, is then wound around ring outside thin steel cylinder
To compressor wire and make mortar cover, it is suitable for the pipeline of bore DN400～1200mm.PCCPE is embedding with thin steel cylinder
In pipe of concrete in-core, outside concrete tube core, then it is wound around ring orientation prestress steel wire and makes mortar cover, being suitable for mouth
The pipeline of footpath DN1400～4000mm.The present invention is directed to embed-type Prestressed concrete cylinder pipe (PCCPE).
PCCP is the compound tubing that steel plate, concrete, high tensile steel wire and cement mortar different materials combine, and has
Steel and the respective characteristic of concrete, including can bear external pressure in height, rigidity big, impervious strong, seal tight, easy for installation, anti-
The features such as shock stability is good, operation and maintenance cost is low, thus long distance water transfer main, urban water supply and industry at home and abroad has
Pressure water (including general power plant, nuclear power station), pressure inverted-siphon, sewage pressure main, submarine pipeline (clean water or saline), overflow
The engineerings such as flow tube are widely adopted.For large-scale water transmission pipeline, PCCP is compared with steel pipe, ductile iron pipe, and advantage is system
Make low cost, and anticorrosive low with maintenance cost.
The U.S. once assessed, and the service life of PCCP was in 75～100 years.But, application so far, the durability of PCCP and can
Increasingly be under suspicion by property.Famous " the big race in the Africa " engineering built the eighties in last century, has sent out during by 2005
Raw 5 PCCP explosion；Part pipeline is through detection, and oneself, it is found that steel wire fracture 3500, is badly in need of carrying out positive rehabilitation plan.
This engineering now, thousands of joint PCCP pipeline sections need repairing or change, and remaining pipeline needs to carry out state estimation.Last century 90
Since age, there is a plurality of PCCP pipeline generation booster event in the U.S., reduces people to PCCP durability and the letter in service life
The heart." PCCP manages the highest failure likelihood and the calamity of inefficacy, has caused the U.S.'s the most not reproduction PCCP pipe ".In
State the most also there occurs the PCCP pipeline of the raw booster of a lot of PCCP pipeline burst event, bob, and the time put into effect is only
There are 3～5 years.Additionally, to running the detection discovery that pipeline is carried out, compressor wire " fracture of wire " is PCCP Common Diseases and hidden danger.
Investigation to all booster events all shows, compressor wire corrosion is broken, and makes PCCP bear intrinsic pressure ability big
Amplitude reduction, is the immediate cause that booster occurs.Wire quality difference and (or) mortar cover lost efficacy then compressor wire rust
Erosion, then be the steel wire main cause of breaking (fracture of wire).Having its source in of problem, embed-type Prestressed concrete cylinder pipe standard gauge
The mortar cover crack-resisting design of model, check method " deflection " it is assumed that have larger difference with reality." deflection " is false
If viewpoint is thought, protective layer will be produced, by higher than the stretching of mortar tensile strength, the microcrack that naked eyes can not be shown in；Split seen from and
Seam deflection is 8 times of microcrack, and now the virtual tension stress of protective layer is mortar tensile strength 8 times.Standard regulation protection
Slabbing seam check method, uses the deflection of suitable 6.4～8 times of cement mortar tensile strength or virtual tension stress, if interior
Deflection or tension stress that outer load produces assume deflection or virtual tension stress less than this, and protective layer crack is just checked
Can pass through.Such protective layer crack check perform practically no function, " PCCP standard specify, mortar cover be not allow for any can
Seeing crack, all cracks of practical situation mortar cover are inevitable ".It is to say, PCCP pipe mortar cover cracking and
Cannot effectively protect compressor wire, be because mortar deformation itself and anti-crack ability is not enough, and sand has been put up with in the design of pipe
Slurry performance, to such an extent as to cause PCCP(PCCPE and PCCPL to manage) there is the defect that congenital durability is not enough.Big in the temperature difference, be dried and
Corrosive atmosphere, this defect is fatal, compressor wire can very fast corrosion, break and booster occur.This Ye Shi U.S. washes in a pan
Eliminate the basic reason of PCCP.
Summary of the invention
The present invention manages the root of this defect just for PCCPE, it is provided that reliable solution, extensive application value weight
Greatly.China produces a large amount of and use PCCPE at present, and this heavy caliber pipe is often used for large-scale, ultra-large type water delivery engineering.This
A little engineerings are projects of vital and lasting importance, do not allow booster occurs or there is potential hidden danger；Problem once occurs, and the loss brought will be huge
Big.People have also realised that, the mortar cover currently used cannot ensure durability and the safety of PCCPE, need
Relatively reliable technical scheme.
It is an object of the invention to, provide a kind of reliable, long-acting for embed-type Prestressed concrete cylinder pipe (PCCPE)
Anti-corrosion method, it is characterised in that: all after embed-type Prestressed concrete cylinder pipe (PCCPE) and Pipe installing expose
Steel, including compressor wire, bellmouth steel loop and socket steel ring, are respectively adopted outside factory and field fabrication ultra-high performance concrete
Protective layer and inner protective layer bonding covering protection；The internal layer concrete inner wall of pipe, uses the ultra-high performance concrete that factory makes
Inner protective layer is protected.
Technical solution of the present invention is: a kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe, its feature
It is: outside embed-type Prestressed concrete cylinder pipe body and Pipe installing is followed by the exposed parts of cephalic groove channel-section steel material, bag
Include compressor wire, bellmouth steel loop and socket steel ring, be respectively adopted factory and make ultra-high performance concrete external protection and scene
Make ultra-high performance concrete inside and outside protective layer inwall, use factory to make the protection of ultra-high performance concrete inner protective layer.
In the production process of pipe, outside outer tube layer concrete and compressor wire, make factory's system of 20～50mm thickness
Make ultra-high performance concrete external protection.
In the production process of pipe, the factory's making very-high performance making 15～30mm thickness at inner tube layer concrete inner wall mixes
Solidifying soil inner protective layer.
After Pipe installing is in place, protect in pipe joint internal channel is filled and made field fabrication ultra-high performance concrete
Layer, bonding covers bellmouth steel loop and socket steel ring exposed parts.
After Pipe installing is in place, make outside field fabrication ultra-high performance concrete in the perfusion of pipe joint outer channel and filling
Protective layer, bonding covers socket steel ring and bellmouth steel loop exposed parts.
In factory and the inside and outside protective layer of field fabrication ultra-high performance concrete, the hardening of used ultra-high performance concrete
Performance reaches standard curing 28 days: comprcssive strength is more than or equal to 120MPa, and elasticity tensile strength is more than or equal to 6MPa, tension
Intensity is more than or equal to 7MPa, and ultimate tensile strength is more than or equal to 1.5 ‰.
Implementation is as follows: 1, prepare ultra-high performance concrete: adhesive aggregation type mix is suitable for roller and penetrates, sprays or smear slurry equipment
Make protective layer；The ultra-high performance concrete mix that Pipe installing uses, is divided into adhesive aggregation type and self-compacting type concrete, wherein self-compaction
Type is for the perfusion of joint exterior bottom groove.The hardening capacity (standard curing 28 days) of ultra-high performance concrete to reach: anti-
Compressive Strength is more than or equal to 120MPa, and elasticity tensile strength (just splitting tension) is more than or equal to 6MPa, and tensile strength (draw by the limit
Stress) more than or equal to 7MPa, ultimate tensile strength is more than or equal to 1.5 ‰.2, in the production process of pipe, at outer concrete
Cover with the ultra-high performance concrete external protection bonding making 20～50mm thickness outside compressor wire；At interior layer concrete
Inwall makes the ultra-high performance concrete inner protective layer of 15～30mm thickness；Steam curing or room temperature moisture-keeping maintaining.3, pipeline peace
Fill in place after, pipe joint internal channel fill adhesive aggregation type ultra-high performance concrete, formed inner protective layer, complete bond covering hold
Mouth steel loop and socket steel ring exposed parts, room temperature moisture-keeping maintaining.4, bottom pipe joint outer channel, self-compaction super is irrigated
Adhesive aggregation type ultra-high performance concrete mix is filled at energy concrete batching system, joint outer channel side and top, forms outer protection
Layer (6-2), completes bonding and covers socket steel ring and bellmouth steel loop exposed parts, room temperature moisture-keeping maintaining.
Technical solution of the present invention, uses and has high deformation and high anti-crack ability, high-tensile ultra-high performance concrete
(UHPC), substitute ordinary mortar as the steel wire of PCCPE and bell and spigot steel loop protective layer, tradition mortar can be inherently eliminated and protect
The defect that sheath deformation is not enough with cracking resistance；Meanwhile, utilize UHPC high bond strength, high tenacity, high impact resistance, height anti-
Ooze performance and good corrosion resistance, the problems such as mortar cover hollowing, easy damaged and corrosion resistance are not enough can be avoided.UHPC
Protective layer can provide protection reliably and with long-term for compressor wire and bell and spigot steel loop, significantly promotes the durability of PCCPE
And service life.Additionally, PCCPE has been also used for pressure sewage or corrosive liquid conveyance conduit, interior layer concrete can be by chemistry
Corrode and reduce service life.For such problem, the present invention makes UHPC protective layer protection PCCPE internal layer coagulation at inside pipe wall
Soil.
Ultra-high performance concrete (Ultra-High Performance Concrete is called for short UHPC), because typically need to mix
Enter steel fibre or high-strength polymer fiber, also referred to as very-high performance fibre reinforced concrete (Ultra-High
Performance Fibre Reinforced Concrete, is called for short UHPFRC).UHPC belongs to modern advanced material, innovates
Cement-based material (concrete or mortar) and fiber, the composite mode of steel (reinforcing bar or high strength wire), significantly carry
High fiber and reinforcing bar intensity utilization ratio in concrete, make all round properties of cement-based material there occurs that great-leap-forward enters
Step has possessed that superelevation is strong, high tenacity and superelevation durability.
" the superelevation mechanical property " of UHPC be mainly reflected in superelevation tensile strength (uniaxial tension and bending and tensile strength) and
High tenacity, this relies on the short steel fibre of addition to realize.Tensile strength may be up to 30MPa, and energy to failure reaches 1,500 ~ 40,000 N/
M(steel fibre volume content 2% ~ 12%), make UHPC stride into toughness, (energy to failure is more than 1,000J/m for the ranks of high-toughness material2Draw
It is divided into toughness material).In terms of deformability, UHPC can realize the apparent of stretching in relatively low content of steel fiber level
" strain hardening " behavior, i.e., there are many microcracks in single shaft tension experience elastic stage, and fiber drawing-resistant function starts；Should with post-tensioning
Power rises, and enters the stiff strain hardening stage (" surrenders " of similar steel)；After reaching cracking, (tension is strong for maximum tension stress
Degree), indivedual crack occurs in local expansion, tension declines afterwards, enters softening stress-displacement stage.Steel fibre intensity obtains effective profit
With, UHPC thus obtain the highest cracking resistance and impact resistance.
Another performance of UHPC most captivation is potential superelevation durability.Theoretically with according to test so far
Result of study, substantially may determine that: UHPC does not has freeze-thaw cycle, alkali-aggregate reaction (AAR) and delayed ettringite formation
(DEF) problem destroyed；In uncracked condition, the intrusion of the anti-carbonation of UHPC, resisting chloride ion penetration, resisting erosion of sulfate, anti-chemistry corruption
Erosion, the endurance quality index such as wear-resisting, compared with tradition high-strength high-performance concrete (HSC/HPC), have carrying of the order of magnitude or multiple
High.UHPC has extraordinary microcrack self-healing ability.Owing to water-cement ratio is the lowest, UHPC mixes and stirs the water yield and is only capable of for part of cement
Aquation, the inside of most cement granules is in does not has hydrated state.Therefore, water or steam enter the crack of UHPC, expose
The unhydrated part of cement granules in fracture faces " will continue " aquation；The hydrated product volume combining outside moisture is more than
Cement is somehow volume, and additional volume can cram crack.Test and engineering verification show, the crack self-healing of UHPC can not only
Enough close microcrack reduce permeability and keep good durability, the most also play the effect of " cementing " crack, the most extensive
The mechanical property that multiple concrete reduces because of crack.
Ultra-high performance concrete used in the present invention (UHPC), possess high deformation and high anti-crack ability, high-tensile,
High tenacity, high impact resistance, high permeability resistant, high-durability and crack self-healing performance；With concrete and the interfacial adhesion of steel
Intensity is the highest, is the anti-corrosion protection material of preferable PCCPE pipe；The protective layer made of it, working life is up to hundred
More than Nian, it it is long-effective corrosion etching method.
Classifying from aggregate size, UHPC is also mortar or extraordinary mortar.UHPC mix rheological characteristic can be prepared high with common
Strength mortar is similar to, and directly uses existing weaponry and equipment roller to penetrate, spray or smear slurry and makes protective layer；Hardening capacity excellent for UHPC is utilized to protect
Protect the steel such as the compressor wire within PCCPE and bell and spigot steel loop, and interior layer concrete, be a kind of easily enforcement, reliable, length
The anti-corrosion method of effect, can significantly promote durability and the working life of PCCPE.
In the implementation of prior art there is premature failure or durability not in Prestressed concrete cylinder pipe (PCCPE)
Good, main cause is compressor wire and the steel cylinder corrosion of PCCPE；Also small part PCCPE initial failure is had to be because producing matter
Amount defect, uses grade defective, improper or the steel of kind, excessively uses cathodic protection (excessive extra current, Ke Nengyin
Liberation of hydrogen causes metal toughness or ductility to reduce, i.e. " hydrogen embrittlement ").Now, standard criterion, such as GB/T 19685-2005 " prestress steel
Cylinder pipe of concrete ", to the PCCP quality of production, (cracking resistance requires to put up with to use steel and mortar cover to clearly require
The performance that mortar can reach)；GB 28725-2012 " cathodic protection in buried Prestressed concrete cylinder pipe road " then advises
Model, instruct and improve PCCPE etch-proof cathodic protection level.But, the mortar cover of PCCPE remains its durability
Weak link.Mortar cover self cracking is inevitable, and in transporting and hoisting process easy damaged, resisting chloride ion penetration invades and anti-ization
Corrosive power is not enough.Big in the temperature difference, be dried, (more generally there is sulphuric acid in soil or subsoil water for drying and watering cycle and corrosive atmosphere
Salt, villaumite or sour corrosion), and under external and internal pressure effect, mortar the most seriously ftractures and very fast deterioration, loses in advance should
The protective effect of power steel wire, bell and spigot steel loop etc..Mortar cover lost efficacy, and the load of cathodic protection will significantly increase, or even
Uncontrollable compressor wire, the spreading of steel loop corrosion.
Requirement can be met for PCCPE mortar cover cracking resistance, corrosion resistance, and internal layer agent on crack resistance of concrete chemistry is rotten
Erosion scarce capacity, also has some patents to propose Improving Measurements, Qi Zhongyou:
There is the embed-type Prestressed concrete cylinder pipe of fibre crack-resistance mortar cover on CN201220309614.4(surface): should
Utility model method relies on and mixes polypropylene fibre raising mortar cracking resistance in mortar.
CN201210162950.5(galvanizing is combined embed-type prestress steel cylinder concrete with epoxide coal bituminous anticorrosion
Pipe), CN201210220591.4(long-life multi-layer anticorrosion process embed-type Prestressed concrete cylinder pipe),
CN201310189741.4(inwall has the embed-type Prestressed concrete cylinder pipe of epoxy protective layer),
The embed-type Prestressed concrete cylinder pipe of CN201510603627.0(long-life full anticorrosive direct drinking-water),
The embed-type Prestressed concrete cylinder pipe of CN201510604025.7(full anticorrosive direct drinking-water): these inventive methods, anticorrosion
Erosion measure includes steel cylinder and wire galvanization, inner liner stainless steel steel cylinder or PVC, inwall coating epoxy coating, pipe outer wall coating epoxy
Bituminous coating, bellmouth steel loop and socket steel ring coating corrosion-inhibiting coating or zinc-aluminium rare earth coating, mortar cover admixture polypropylene fibre
Dimension improves cracking resistance, etc., and these measures of compound use.
The PCCP power plant cooling water cylinder concrete pipe of CN201310187286.4(band anticorrosive coat and production method): should
Inventive method, while the last operation of whitewashing together that traditional PCCP pipeline produces, uses scraping device by the water after whitewashing
Cement mortar surface strikes off, simultaneously after the device of underflow of cementing of follow-up cement mortar is coated with strike off after crude pipe surface,
The cement mortar that pipe surface is coated with by the pressurization floating device followed up the most afterwards is the most floating, afterwards after pipeline parches completely, at pipe
Surface, road uses the method coating epoxy resin of machinery and is wound around glass fibre, uses mechanical means to scrape floating whole simultaneously, to be coated
It is production tube after the epoxy resin fiberglass protective layer solidification covered.
The Prestressed concrete cylinder pipe of CN201310187303.4(band epoxy mortar protective layer and production method): should
Inventive method, while the last operation of whitewashing together that traditional PCCP pipeline produces, uses scraping device by the water after whitewashing
Cement mortar surface strikes off, simultaneously after the device of coating epoxy resin of follow-up epoxy resin is coated with strike off after crude pipeline table
Face, more afterwards follow-up epoxy mortar coating unit by epoxy mortar coating and epoxy resin surface pressurize floating simultaneously.
CN201310187328.4(Novel seepage PCCP Prestressed concrete cylinder pipe and production method): this invented party
Method, while the last operation of whitewashing together that traditional PCCP pipeline produces, uses scraping device by the cement mortar after whitewashing
Surface strikes off, simultaneously after the device of underflow of cementing of follow-up cement mortar is coated with strike off after crude pipe surface, then heel
The cement mortar that pipe surface is coated with by the pressurization floating device entered is the most floating.
In said method, polypropylene fibre can only improve mortar hardening stage anti-crack ability, i.e. prevents from or reduce mortar moulding
Property contraction fissure；Polypropylene fibre can not improve the cracking resistance of hardened mortar, because its elastic modelling quantity is the lowest, it is impossible to constraint
The crack of hardened mortar；Additionally, the method does not improve impermeability and the resistance to corrosion of mortar.Mortar cover surface-coated
Epoxy resin fiberglass anticorrosive coat, bituminous epoxy coating etc., can completely cut off mortar with corrosive environment；Steel cylinder and wire galvanization,
Bell and spigot steel loop coating anticorrosive paints etc., can delay the generation of corrosion.Can these anti-corrosion methods extensively be applied, and depends on into
Originally with antiseptic effect or cost performance.
The present invention provides a kind of brand-new technical scheme, substitute tradition mortar with UHPC, the UHPC used possesses
Excellent mechanical property and durability, can protect the compressor wire within PCCPE, bellmouth steel loop and socket steel ring stably in a long term
In not corrosion, and protection, layer concrete is from chemical attack.Easy implementation and the reliability advantage of this technical scheme are embodied in:
1, UHPC mix rheological characteristic can be prepared similar with ordinary mortar, it is simple to directly use existing weaponry and equipment roller to penetrate, spray in factory
It is coated with or smears external protection in slurry makes, it is not necessary to change existing production technology；Meanwhile, self-compaction can be prepared in situ at Pipe installing
With adhesive aggregation type UHPC mix, it is simple to perfusion and fill pipe joint groove, bonding covers and protects bellmouth steel loop and socket steel
Ring exposed parts.
2, UHPC mix has high cohesion, with good adherence of concrete, steel wire and steel loop surface, can improve plant protection
Layer make efficiency, and improve the efficiency of Pipe installing field joint trench fill making protective layer.
3, the interface binding intensity between hardening UHPC and concrete, steel wire and steel loop, significantly larger than normal concrete, sand
That slurry can reach and between concrete, steel interface binding intensities, it is easy to avoid the occurrence of the defects such as hollowing.
4, used in the present invention containing micro steel fiber UHPC, possess high deformation and high anti-crack ability, high-tensile and
High impact-resistance, it is possible to ensure that PCCPE protective layer is in various mechanics loads (pipeline transportation lifting collision, external and internal pressure effect)
Globality under acting on environmental load (drying and watering cycle, variations in temperature).
5, UHPC has high solidity, high permeability resistant, good corrosion resistance and high anti-freezing and melts performance, and UHPC itself is current
(in natural environment more than working life a century, Japan's specification thinks that UHPC ties to the material that in all engineering materials, durability is best
Structure working life 100 years), therefore can be compressor wire and bell and spigot steel loop and interior layer concrete provides guarantor reliably and with long-term
Protect.
6, UHPC protective layer technical scheme is used, in the face of salt-soda soil or ground water chemistry corrosion, it is no longer necessary to do at pipe shaft
Corrosion-inhibiting coating, advantage of lower cost.UHPC protective layer is compatible with cathode protection technology, and cathodic protection can be as standby measure.
7, UHPC protective layer good combination property, reliability are high, can be PCCPE compressor wire and bell and spigot steel loop and interior
Layer concrete provides long life anti corrosion protection, significantly reduces pipeline performance maintenance and repair expense, the century-old engineering of achievement.
8, the present invention solve PCCPE protective layer crack-resisting design, check method hypothesis inconsistent with mortar material performance
A difficult problem, eliminate from root PCCPE design durability defect.
It is an advantage of the current invention that: prepared UHPC mix rheological characteristic is similar with ordinary mortar, can be used directly existing
Equipment roller is penetrated, sprays or is smeared slurry and makes protective layer；Used ultra-high performance concrete (UHPC) possesses the physical mechanics property of excellence
Can, including high deformation and high anti-crack ability, high-tensile, high bond strength, high tenacity, high impact-resistance and high anti-
Ooze performance, high resist chemical performance and high anti-freezing and melt performance superelevation durability, for embed-type prestress steel cylinder concrete
Pipe (PCCPE) provides reliable, long-acting anti-corrosion protection, increases substantially durability and the reliability of this kind of pipeline, and guarantee makes
The pipeline laid with this tubing realizes desired long service live (75～100 years).
Accompanying drawing explanation
Fig. 1 is the present invention embed-type Prestressed concrete cylinder pipe structural representation.
1-steel cylinder；2-compressor wire；3-bellmouth steel loop；4-socket steel ring；5-factory makes outside ultra-high performance concrete
Protective layer；6-1-field fabrication ultra-high performance concrete inner protective layer；6-2-field fabrication ultra-high performance concrete external protection；
Layer concrete in 7-；8-outer concrete；9-rubber ring；The pre-buried anchorage of 10-；11-factory is protected in making ultra-high performance concrete
Sheath
Specific implementation method
Embed-type Prestressed concrete cylinder pipe (PCCPE) compressor wire, part bellmouth steel loop and the work of part socket steel ring
Factory makes the factory of ultra-high performance concrete external protection 5 and interior layer concrete and makes ultra-high performance concrete inner protective layer 11,
Complete in factory.After Pipe installing is in place, joint bellmouth steel loop and the very-high performance coagulation of socket steel ring exposed parts
Soil inner protective layer 6-1 and external protection 6-2, completes in Pipe installing field fabrication.Specifically comprise the following steps that
1, adhesive aggregation type ultra-high performance concrete is prepared in factory: newly mixing the mix slump is 30 ~ 100mm, applicable mechanical roller penetrates,
Spray or smear slurry and make protective layer.The hardening capacity (standard curing 28 days) of ultra-high performance concrete to reach: comprcssive strength is big
In or equal to 120MPa(100mm cube of test specimen), elasticity tensile strength is more than or equal to 6MPa(30mm thick plates test specimen), tension
Intensity is more than or equal to 7MPa, and ultimate tensile strength is more than or equal to 1.5 ‰.
2, in the production process of PCCPE, outside outer concrete 8 and compressor wire 2,20～50mm thickness are made
Factory makes ultra-high performance concrete external protection 5；The factory making 15～30mm thickness at internal layer concrete seven inwall makes super
High performance concrete inner protective layer 11；Steam curing (90 DEG C of constant temperature 48 hours, heating-cooling speed is less than 15 DEG C/h) or room temperature
Moisture-keeping maintaining at least 7 days.
3, on-the-spot at Pipe installing, prepare self-compacting type concrete and adhesive aggregation type ultra-high performance concrete, wherein self-compacting type concrete is used for
Perfusion bottom pipe joint outer channel.The hardening capacity of ultra-high performance concrete requires ibid.
4, after Pipe installing is in place, adhesive aggregation type ultra-high performance concrete is filled in pipe joint internal channel, protection in being formed
Layer 6-1, completes bonding and covers bellmouth steel loop 3 and socket steel ring 4 exposed parts, room temperature moisture-keeping maintaining at least 7 days.
5, irrigating self-compaction super performance concrete bottom pipe joint outer channel, joint outer channel side and top are filled out
Fill adhesive aggregation type ultra-high performance concrete mix, form field fabrication ultra-high performance concrete external protection 6-2, complete bonding and cover
Lid socket steel ring 4 and bellmouth steel loop 3 exposed parts, room temperature moisture-keeping maintaining at least 7 days.
Claims (6)
- A kind of long-effective corrosion etching method of the most embed-type Prestressed concrete cylinder pipe, it is characterised in that: embed-type prestress steel Outside cylinder pipe of concrete body and Pipe installing is followed by the exposed parts of cephalic groove channel-section steel material, including compressor wire (2), bellmouth Steel loop (3) and socket steel ring (4), be respectively adopted factory and make ultra-high performance concrete external protection (5) and field fabrication superelevation The inside and outside protective layer of performance concrete (6-1,6-2) is protected；Interior layer concrete (7) inwall of pipe, uses factory to make very-high performance Concrete inner protective layer (11) is protected.
- A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe the most according to claim 1, its feature It is: in the production process of pipe, makes the work of 20～50mm thickness at outer tube layer concrete (8) and compressor wire (2) outside Factory makes ultra-high performance concrete external protection (5).
- A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe the most according to claim 1, its feature Being: in the production process of pipe, the factory's making very-high performance making 15～30mm thickness at inner tube layer concrete (7) inwall mixes Solidifying soil inner protective layer (11).
- A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe the most according to claim 1, its feature It is: after Pipe installing is in place, fills in pipe joint internal channel and make field fabrication ultra-high performance concrete inner protective layer (6- 1), bonding covers bellmouth steel loop (3) and socket steel ring (4) exposed parts.
- A kind of long-effective corrosion etching method the most according to claim 1, it is characterised in that: after Pipe installing is in place, at pipeline The perfusion of joint outer channel and filling make field fabrication ultra-high performance concrete external protection (6-2), and bonding covers socket steel ring And bellmouth steel loop (3) exposed parts (4).
- A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe the most according to claim 1, its feature It is: in factory and the inside and outside protective layer of field fabrication ultra-high performance concrete (5,11,6-1,6-2), used very-high performance mixes The hardening capacity of solidifying soil reaches standard curing 28 days: comprcssive strength is more than or equal to 120MPa, elasticity tensile strength more than or etc. In 6MPa, tensile strength is more than or equal to 7MPa, and ultimate tensile strength is more than or equal to 1.5 ‰.
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| CN201610689026.0A CN106287008A (en) | 2016-08-19 | 2016-08-19 | A kind of long-effective corrosion etching method of embed-type Prestressed concrete cylinder pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4075037A1 (en) * | 2021-04-14 | 2022-10-19 | IFP Energies nouvelles | Pipe for transporting pressurised fluid made of ultra high-performance fibre-reinforced concrete |
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