CN107119551A - A kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires - Google Patents
A kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires Download PDFInfo
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- CN107119551A CN107119551A CN201610102372.4A CN201610102372A CN107119551A CN 107119551 A CN107119551 A CN 107119551A CN 201610102372 A CN201610102372 A CN 201610102372A CN 107119551 A CN107119551 A CN 107119551A
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- steel strand
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires, belong to Structural Engineering field.Internal post-tensioned prestressing steel strand wires are easily corroded, and testing cost is high, and maintenance difficult is a knotty problem of post-tensioned prestressing structure.The present invention proposes a kind of means of defence, scheme is the anchored end drilling from component sealing off and covering anchorage concrete to prestressing tendon, or the slurry drilling from the component surface of prestressed pore passage side into prestressed pore passage, pass through to drill and people's modified silicone resin liquid is oozed into prestressed pore passage.The modified silicone resin of liquid can permeate along the gap of steel wire in prestress wire.The modified silicone resin and modified silicone resin of Steel Wire Surface penetrate into the permeable formation formed around presstressed reinforcing steel in cement mortar, can effectively protect steel strand wires, prevent the generation of corrosion, or slow down the speed and degree of corrosion., can the reserved perforate when making, infiltration modified silicone resin liquid to new structural member.The invention is simple to operate, and effect is good, and expense is low, and existing component and new structural member are all suitable for.
Description
Technical field
The present invention relates to a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires, belong to Structural Engineering field.
Background technology
Almost all of significant concrete construction all employs post-tensioned prestressed concrete technology.Particularly in science of bridge building field, post-tensioned prestressed concrete technology is widely used in the design of bridge, built.
It is well known that in post-tensioned construction, prestressed stretch-draw must carry out mud jacking to prestress pipe in time after finishing, with the presstressed reinforcing steel in protective conduit.In Bonded post-tensioned pre-stressed concrete structure, the anti-corrosion of cooperation and presstressed reinforcing steel between presstressed reinforcing steel and concrete is realized by filling cement mortar in prestress pipe.Once post-tensioned prestressing steel strand wires corrode, cause Structural defect or deterioration, safety and durability will go wrong, it is possible to can cause bridge collapse, until the serious accident of personal injury, this kind of accident can cause severe social influence and great economic loss.
All the time, it is believed that mortar quality is critically important, because the Corrosion behavior of presstressed reinforcing steel is to have permeable hole inside mortar infiltration and mortar.This causes people to make great efforts to improve the impervious quality of mortar.Although present slurry performance has a very big improvement, it has been found that having cavity in slurry, the slurry of separation, soft slurry, high-caliber sulphates content, high chloride ion content in the structure built recently.In addition, higher relative humidity is a dangerous matter sources of pre-stress system corrosion, even if without chlorion, higher relative humidity still influences the performance of cement slurry, particularly in the case where there is hole, it reduces resistance, and resistance is an erosion-resisting important materials performance.
Recent years uses vacuum grouting method grouting methol, drastically increases the plumpness of cement mortar in duct.But cement slurry is a kind of porous material in itself, and the infiltration of moisture and moisture is not stopped still.
Wire galvanization or epoxy are sprayed, are that the current steel strand wires that improve protect relatively effective method.But it is careless slightly in the manufacture, transport and installation process of steel strand wires, can loss protection layer.Even a small impaired loci, after condition possesses, corrosion also can be since it.
The corrosion problem of steel wire is always the technical barrier in science of bridge building., similarly there is steel wire Anticorrosion in the main push-towing rope in the either drag-line in cable-stayed bridge, suspension bridge, the suspension rod in suspension rod, or lower bearing arch bridge, and its steel wire importance it is also evident that conventional safety technique is not solving the problems, such as corrosion fundamentally yet.Although the method that high tensile steel wire is replaced by into high strength stainless steel silk is gradually being approved by industry.Think fundamentally solve the problems, such as its corrosion, so as to provide help for the long-term health development of bridge construction.But because of currently manufactured technical problem, quality is still unstable, and involves great expense, and is not widely applied.Therefore, it is difficult extensively using the steel strand wires made using stainless steel wire in a short time.Even if being truly realized after the several years, a large amount of post-tensioned concrete structures built in the past still have to effectively be safeguarded.
It is conventional practice have shown that, although with multiple tracks protection, still the presstressed reinforcing steel failure after using 6 ~ 17 years of some post-tensioned concrete structures.
After may be corroded from the presstressed reinforcing steel inside appearance discovery, the detection to its corrosion location and degree is extremely difficult.Although current alternative detection technique has supercritical ultrasonics technology, shock wave method, GPR method etc., technology is all immature, and is only capable of detecting than more serious corrosion damage.Even if detecting, deal with it is also pretty troublesome, it is to being that at local damage, processing can be opened, but to large-scale leakiness and slight damage, then helpless.The latter has a strong impact on the safety of structure over time, equally.
Therefore, the anti-corrosion of compressor wire is technical barrier urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to solve above-mentioned the deficiencies in the prior art and problem, there is provided a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires.The technology can have slurry between space, and steel strand wires steel wire and there are relatively more holes according to existing inside slurry between small hole, and steel strand wires steel wire.These holes and space, are easy to anti-corrosion liquid along prestressed pore passage longtitudinal dispersion.Therefore, the present invention penetrates into low-viscosity anti-corrosion liquid to slurry, in steel surface formation protective layer, impregnating the slurry of surrounding and forming the barrier for stopping moisture and oxygen.
The major programme of the invention is, to existing post-tensioned structure, drill and hole or drill hole from the slurry of the component surface of prestressed pore passage side into prestressed pore passage to the anchored end of prestressing tendon from sealing off and covering anchorage concrete, to new post-tensioned structure, the reserved hole towards in steel strand anchoring end or prestressed pore passage when then making, the low-viscosity steel wire anti-corrosion liquid of people is oozed by hole into prestressed pore passage.There are relatively more holes in the slurry that can exist between steel strand wires steel wire between space, and steel strand wires steel wire, therefore, and most efficient method is impregnated since the center of steel beam end.But to the component being installed in place, end is difficult to touch or operated, and can now drill bellows, people's impregnating fluid body is oozed the slurry around the steel strand wires, allows it to arrive between steel wire, then rapidly along presstressed reinforcing steel longtitudinal dispersion.
Further, described anti-corrosion liquid is modified silicone resin.Silicones is the thennoset polysiloxane polymer with highly cross-linked structure, with good electrical insulation property, the effect of heatproof and waterproof.And weatherability is better than general organic resin.Therefore, it is all preferable material in the coating on heatproof, heat-resisting and anti-wet process protection top layer.Silicones also acts as heat-resisting, pressure-resistant anticorrosive paint, metal protective coating, waterproof construction moisture-proof coating, releasing agent, adhesive etc..Heat resistance of organic silicon resin is good, generally all stablizes at less than 250 degree Celsius.And water-fast sex expression is excellent, the arrangement of methyl makes it have hydrophobicity in molecule, and the water imbibition of its film is small.Even if absorbing moisture, it also can rapidly release and return to original state.These advantages of silicones, make it be especially suitable for the slightly modified anti-corrosion applied to steel wire.
Further, process of osmosis was reached after 12 hours, and cavity is closed with waterproof material.To a variety of modified silicone resins, before implementation or it can implement the incipient stage, the specific seepage velocity of experimental test, it is determined that specific blocking time.The closure of hole needs to use waterproof material, such as waterproof mortar, epoxy mortar etc..
Because of the importance of presstressed reinforcing steel, and it is impaired after easy fracture and the characteristics of corrosion, to existing post-tensioned structure, when drilling hole from the slurry of the component surface of prestressed pore passage side into prestressed pore passage, drill bellows, steel wire of not damaging.
In addition, in order to accelerate seepage velocity, can pasting mud jacking mouth using there is pressure to permeate in described hole mouthful, accelerating the infiltration of anti-corrosion liquid using slip casing by pressure mode.
During Specific construction, according to construction drawing or GPR can be used, determine the particular location of presstressed reinforcing steel, after the anchor point in steel beam or the middle part perforate in duct, repair the seepage point that has found, and to leak detection after, start dipping.From end dipping, anti-corrosion liquid can extend 75 meters along the space inside steel strand wires.From 30 meters can be respectively impregnated if the perforate of middle part to both sides.
The preservative treatment of the suspension rod in main push-towing rope, suspension rod, and lower bearing arch bridge in the drag-line that the present invention can equally be well applied in cable-stayed bridge, suspension bridge.
Compared with prior art, the invention has the advantages that：
（1）It is simple to operate, and need not too high technical requirements, convenient construction；
（2）Effect is good, and impregnating fluid physical efficiency infiltrates through slurry in steel surface formation corrosion prevention film, forms the supplementary protection barrier around steel strand wires；
（3）Expense is low, because recruitment is few, material usage is few, in addition also as the penetration length of anti-corrosion liquid is longer；
（4）Have a wide range of application, new and existing post-tensioned prestressing muscle is all suitable for.
Claims (5)
1. a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires, it is characterised in that：To existing post-tensioned structure, drill and hole or drill hole from the slurry of the component surface of prestressed pore passage side into prestressed pore passage to the anchored end of prestressing tendon from sealing off and covering anchorage concrete, to new post-tensioned structure, the reserved hole towards in steel strand anchoring end or prestressed pore passage when then making, the low-viscosity steel wire anti-corrosion liquid of people is oozed by hole into prestressed pore passage.
2. a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires according to claim 1, it is characterised in that：Described anti-corrosion liquid is modified silicone resin.
3. a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires according to claim 2, it is characterised in that：Process of osmosis was reached after 12 hours, and cavity is closed with waterproof material.
4. a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires according to claim 1, it is characterised in that：To existing post-tensioned structure, when drilling hole from the slurry of the component surface of prestressed pore passage side into prestressed pore passage, bellows is drilled, steel wire of not damaging.
5. a kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires according to claim 1, it is characterised in that：Mud jacking mouth is pasted in described hole mouthful, accelerates the infiltration of anti-corrosion liquid using slip casing by pressure mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610102372.4A CN107119551A (en) | 2016-02-25 | 2016-02-25 | A kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610102372.4A CN107119551A (en) | 2016-02-25 | 2016-02-25 | A kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires |
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| CN107119551A true CN107119551A (en) | 2017-09-01 |
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| CN201610102372.4A Pending CN107119551A (en) | 2016-02-25 | 2016-02-25 | A kind of anti-corrosion method of internal post-tensioned prestressing steel strand wires |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107795072A (en) * | 2017-11-28 | 2018-03-13 | 北京市地铁运营有限公司地铁运营技术研发中心 | Reinforcement type subway prestressing force beam body and manufacture method |
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| KR20050061435A (en) * | 2005-06-01 | 2005-06-22 | 김기태 | The cross-lined steel wire rope support and the reinforcement method of construction using of the cross-lined steel wire rope support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107795072A (en) * | 2017-11-28 | 2018-03-13 | 北京市地铁运营有限公司地铁运营技术研发中心 | Reinforcement type subway prestressing force beam body and manufacture method |
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Application publication date: 20170901 |
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