CN102337743A - Method for repairing and reinforcing pile foundations in ocean splash zones - Google Patents
Method for repairing and reinforcing pile foundations in ocean splash zones Download PDFInfo
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- CN102337743A CN102337743A CN2011102112991A CN201110211299A CN102337743A CN 102337743 A CN102337743 A CN 102337743A CN 2011102112991 A CN2011102112991 A CN 2011102112991A CN 201110211299 A CN201110211299 A CN 201110211299A CN 102337743 A CN102337743 A CN 102337743A
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Abstract
The invention provides a method for repairing and reinforcing pile foundations in ocean splash zones. The method is characterized by comprising the following steps: firstly carrying out interface treatment on the splash zones and the zones needing repair near the splash zones aiming at different pile body types, fixing end hoops for bearing upper construction loads on the lower edges of the repaired zone, installing external molds and then continuously pouring a self-compaction ultra high toughness cementitious composite (UHTCC). The method has the following beneficial effect: erosion of dry-wet alternation and chloride ion permeation in the splash zones, temperature difference and sea wave impact effect can be effectively resisted, thus ensuring the durability of pile bodies under the environmental condition of severe corrosion.
Description
Technical field
The invention belongs to port works, technical field of bridge engineering, relate to the reinforcing recovery technique of the pile foundation of marine environment lower terminal and bridge, especially spatter the method for the pile body part in district and tidal range district for repairing and reinforcement suffers the ocean wave of heavy corrosion.
Background technology
The harbour engineering structure is in the ocean highly corrosive environments; Especially wave spatters plot structure and partly is in very abominable chlorion erosion environment; The endurance issues that ubiquity is comparatively serious, and the corrosion of steel bar that villaumite causes is the subject matter that present port works faces.In long piled wharf and bridge spanning the sea structure, pile foundation safe and reliable particularly important.Wave more than high water mark spatters the district, and pile body suffers morning and evening tides, sea beat effect, and chlorion is easy to gather; The concrete chloride ion that is in non-full water state is easier to spread to percdation; And this regional oxygen supply is abundant, and the corrosion process very easily takes place, and is having a strong impact on the endurance quality of pile body.The reliability at this position is directly connected to the safe, reliable of whole pile body even total.
For steel pipe pile, although excellent mechanical property is arranged, there is the weakness of inborn corrosion resistance difference, particularly spatter the position, district at wave.Current, usually use in the engineering and reserve corrosion allowance+coating protection+cathodic protection, but these anti-corrosion measures spatter the district at wave and be still less reliable, only continue just to need to be serviced in several years, greatly increased daily maintenance cost.General still the need need be taked independent anti-corrosion measure in this zone, like measures such as metal spraying, organic coating, inorganic coating and protective jacket protections.But these measures also be short-term or mid-term maintenance scheme, can not guarantee the endurance quality of dock structure during whole operation.
By contrast, Big Pipe Pile and PHC stake have the characteristics that durability is high, anti-permeability performance is good, but its anti-bending bearing capacity is far below steel pipe pile, and the pile sinking slope is little, and is impacting under the bigger situation of number of times, occurs pile body cracking and the bad phenomenon of stake bursting easily.Secondly, the passing ships below some bridges may rub the pile body sidewall, and its more weak impact property possibly cause concrete cracking even partial layer to come off.These situation all can greatly weaken concrete durability, reduce its normal application life, must carry out some necessary reparations, could satisfy the requirement of durability aspect.
Superhigh tenacity cement-base composite material (UHTCC) is as a kind of high-performance cement based composites; Under tensile load, show significant stretching strain sclerosis characteristic and many fine and closely woven fracture patterns; Ultimate tensile strength can reach more than 1%; Maximum crack width can be controlled within the 100 μ m, and some durability experiments show that this material has good impervious, anti-carbonization, impact property, chloride-penetration resistance and good Crack Control ability.The bend test that reinforced concrete beam is split in the UHTCC control that Xu etc. is carried out shows; UHTCC can be separated into many fine and closely woven cracks with the single crack that occurs in the concrete, and after the crack appearred in UHTCC tight side edge, crack width increased very slow; Reach surrender up to the longitudinal tensile reinforcing bar; The surface maximum crack width only has about 100 μ m, and obviously, this crack width rank is enough to satisfy the requirement under the extremely serious F environmental activity grade of corrosion.Secondly, under general normal operating condition, maximum load is merely about 60% of ultimate load, and it is much smaller than the yield load of member, so maximum crack width is merely 100 μ m under the normal duty.
Based on this, endurance quality that UHTCC is good and Crack Control ability make it become the ideal reinforcing repair materials that a kind of marine structure wave spatters district's part, can not only improve its cracking resistance, control and split ability, and can improve the endurance quality of pile body.
Summary of the invention
Technical problem to be solved by this invention provides the method that a kind of repairing and reinforcement ocean wave spatters district's pile foundation; Can resist the corrosion function that wave spatters district's alternation of wetting and drying, chloride permeability effectively; The opposing temperature difference and sea beat effect guarantee the endurance quality of pile body under the ambient conditions of this heavy corrosion.
The present invention realizes through following technical scheme: a kind of repairing and reinforcement ocean wave spatters the method for district's pile foundation; It is characterized in that at first interface processing being carried out in the zone that wave spatters district and near the reparation of needs thereof to different pile body types; Repairing the end hoop that district's lower limb fixedly bears the top working load; External mold, continuous placing self-compaction superhigh tenacity cement-base composite material UHTCC then are installed.
Said repair materials UHTCC is made up of short fiber and mortar matrix, and the short fiber kind of admixture is one or more in vinal, polyethylene fibre, the aromatic polyamide fibre, and the volume volume is 1 ~ 3% of a UHTCC cumulative volume; The components by weight of mortar matrix is a cement: water: meticulous aggregate: flyash: silicon ash: granulated blast-furnace slag: metakaolin=1: (0.27 ~ 2.2): (0 ~ 3): (0 ~ 6.9): (0 ~ 0.3): (0 ~ 0.55): (0 ~ 0.4), and the maximum particle diameter of meticulous aggregate is not more than 0.5 mm; During the varying in weight of meticulous aggregate, flyash, silicon ash, granulated blast-furnace slag, metakaolin is zero; Meanwhile, an amount of chemical admixture of admixture according to actual needs, the water reducing agent as 0.2% ~ 3%, 0.05% ~ 0.3% antifoaming agent, 0.003% ~ 0.02% air entraining agent, 0.03% ~ 0.3% thickener etc.
Said to different pile body types, for steel pipe pile, its interface processing may further comprise the steps:
1), whole repairing area is carried out blasting treatment and manual mode is removed surperficial rusty stain and marine organisms attachment;
2), with the pitch arrangement shear connector of 100 ~ 300 mm;
3), to whole reparation district spraying protective coating.
Said to different pile body types, for concrete tubular pile, its interface processing may further comprise the steps:
1), clears up the loose part of being corroded;
2), near zone dashed hair handle, remove surperficial laitance, expose fresh interface, and make the interface have the roughness of 3 ~ 5 mm.
Said to different pile body types; For concrete tubular pile, if repair layer thickness surpasses 50 mm, then after disposing towards hair; In of the spacing boring of former component surface with 100 ~ 300 mm; Then the hole is cleaned out,, then shear connector is implanted in the hole prefabricated shear connector and hole coated with adhesive.
Said end hoop is that thickness is the annular angle steel form of 4 ~ 14 mm, and lays stiffener at a distance from 300 ~ 400 mm, guarantees under the working load effect, not topple; And the position that contacts with pile body on every side is provided with the rubber pad, and it is tight to guarantee that both contact, and stops seawater and gets into.
Said external mold is the glass fiber reinforced plastic semicircle mould of common steel semicircle mould or lightweight.
The method of said continuous placing UHTCC is: the UHTCC that stirs is delivered to simultaneously and repairs the bottom, district through being evenly distributed on 3 ~ 4 soft conduits around the pile body, implement the continuous pouring operation, guarantee that the repair layer height rises synchronously around pile body.
Restorative procedure of the present invention, concrete parameter such as the thickness of outsourcing UHTCC layer, the strength of materials can be taken all factors into consideration according to aspects such as extent of corrosion, ambient conditions, target durability requirements and decide, and thickness is generally 30 ~ 100 mm.
Owing to adopt technical scheme of the present invention; Make pile body and the said superhigh tenacity cement-base composite material UHTCC integument tight bond of repairing the district together; Can collaborative work, constitution system has made full use of the remarkable Crack Control ability of this material; Endurance qualities such as good anti-carbonization, impermeabilisation, resisting chloride ion penetration erosion; And high shock resistance, not only guaranteed the endurance quality that the pile body structure is spattered the district at the very serious wave of corrosion, and the reciprocal percussion that can resist this regional temperature difference and wave.The performance that UHTCC is good and certain repairing thickness can guarantee effectively that pile body in this regional endurance quality, exempts regular regular maintenance, have prolonged the application life of pile body, have remarkable economic efficiency.Particularly for steel pipe pile; Common recovery technique only has the anticorrosion life-span about 10 years; And adopt reinforcing recovery technique of the present invention, endurance quality that UHTCC is good and Crack Control ability can completely cut off contacting of steel pipe pile and extraneous high corrosive environment effectively, realize a) " permanent " protection (> 50 of pile body; Its anticorrosion life-span can even can reach 100 years, and its running cost of practicing thrift is considerable.
Description of drawings
Fig. 1 repairs the plan view of steel pipe pile for the present invention.
Fig. 2 repairs the shop detail drawing of steel pipe pile for the present invention's technology.
Fig. 3 repairs the sectional drawing of steel pipe pile for the present invention's technology.
Fig. 4 is the sectional drawing of the present invention's technology rehabilitating concrete stake.
Among the figure: 1:UHTCC; 2: peg; 3: the steel pipe pile lining; 4: the concrete pile body; 5: dowel; 6: the end hoop; 7: rubber pad; 8: stiffener; 9: soft conduit; 10: steel semicircle template.
The specific embodiment
The embodiment of pile tube provided by the present invention is following:
According to actual corrosion situation, delimit wave and spatter district and following 1 m scope thereof as repairing area, repairing altogether highly is 3 m, and the repairing thickness t is 70 mm, and r is the pile tube external diameter.The concrete parameter of steel pipe pile is diameter 1200 mm, wall thickness 20 mm, Q345 steel.The practical implementation step is following:
(1) at first blasting treatment is carried out with quartz sand in the anticorrosion position of large tracts of land, remove surface rusty stain, hand cleaning is further adopted at the serious position of other corrosions, or knocks out floating rust with hammer.Root out the bulge of floating rust and adhere to marine growth (oyster etc.) with steel shovel, the marine alga that adheres to steel brush and coarse sandpaper removing etc.
(2) by certain pitch arrangement shear connector, the mode through weld stud 2 strengthens the interface cementitiousness, guarantee steel pipe pile lining 3 and UHTCC 1 both bond reliably, collaborative work.
In the present embodiment, the shear connector of layout is peg 2 (length is 35 mm, and diameter is 8mm); Begin to be provided with peg from top and bottom apart from 50 mm, top and bottom are provided with 3 row's pegs respectively, and its spacing longitudinally reaches and laterally is 100 mm; Whenever at a distance from 200 mm 1 row's peg is set in the middle part, the two rows dislocation is arranged to plum blossom shape, then it is welded on the steel pipe pile lining; Guarantee that the interface bonding is reliable, the crack, interface do not occur.At restoring area spraying one deck protective coating, further improve its anti-corrosion capability then.
(3) at the restoring area lower limb end hoop 6 is set, said end hoop is the annular angle steel form of thickness 10 mm, and lays stiffener 8 at a distance from 300 ~ 400 mm, guarantees under the working load effect, not topple.Steel semicircle template 10 is installed above end hoop 6, and is filling up rubber filler strip 7 between two semicircle templates 10 and between end hoop 6 and pile tube, stop seawater to get into.At semicircle template 10 tops positioning checkpoint is set, guarantees consistent wall thickness.
(4) weight ratio of the mortar matrix composition of used repair materials UHTCC1 is a cement: water: sand (meticulous aggregate): flyash: silicon ash: water reducing agent=1:1.58:1.5:2.0:0.15:0.02; And admixture volume volume is 2% polyvinyl alcohol short fiber of UHTCC cumulative volume, and the maximum particle diameter of sand is 0.2 mm.UHTCC mortar matrix good fluidity, not only fiber can evenly disperse, and the UHTCC mixture can also reach the self-compaction requirement, and good cohesiveness and water retention are arranged.
(5) UHTCC that stirs is transported in the soft conduit 9 through slurry filling machine, from bottom to up continuous placing.Evenly arrange around the pile body 4 delivery hoses 9 from the cross section four direction carry mixture simultaneously, slowly upwards promote flexible pipe simultaneously, not only guaranteed speed of application, also guaranteed to wrap up in outside each position repair layer and built high level of synchronization and rise, finish until building.
(6) build end after, carry out natural curing, treat with condition curing test block intensity reach normal intensity 75% the back form removal.
According to its actual corrosion situation, delimit wave and spatter district and following 1 m scope thereof as repairing area, repairing altogether highly is 3 m, the repairing thickness t is 70 mm.The practical implementation step is following:
(1) at first with the loose concrete chisel removal of severe local corrosion location, then whole restoring area is dashed hair and handle, remove surperficial laitance, expose fresh interface, and make the surface become rough and uneven in surface shape, dash the hair degree of depth about 3 ~ 5 mm.
(2) surpass 50 mm if repair thickness, then shear connector 5 need be set in addition, guarantee that UHTCC and original concrete binding of newly building are reliable, present embodiment is provided with said shear connector 5.
The L type dowel shear connector 5 of placement diameter 8 mm begins to be provided with connector 5 from top and bottom apart from 50 mm, longitudinally with laterally whenever at a distance from 200 mm 1 row's connector 5 is set, and the two rows dislocation is arranged to plum blossom shape.The holes of drill diameter 10 mm, the degree of depth 80 mm uniformly on pile body 4 surface, and dispose dust, filling adhesive in the hole then, and evenly spread upon on the shear connector 5, shear connector 5 is inserted in the hole, its crotch direction is arranged along the pile body length direction.
Step afterwards is identical with step (3)-(6) of embodiment 1.
Claims (8)
1. a repairing and reinforcement ocean wave spatters the method for distinguishing pile foundation; It is characterized in that at first interface processing being carried out in the zone that wave spatters district and near the reparation of needs thereof to different pile body types; Repairing the end hoop that district's lower limb fixedly bears the top working load; External mold, continuous placing self-compaction superhigh tenacity cement-base composite material UHTCC then are installed.
2. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation; It is characterized in that said self-compaction superhigh tenacity cement-base composite material UHTCC is made up of short fiber and mortar matrix; The short fiber kind of admixture is one or more in vinal, polyethylene fibre, the aromatic polyamide fibre, and the volume volume is 1 ~ 3% of a UHTC cumulative volume; The components by weight of mortar matrix is a cement: water: meticulous aggregate: flyash: silicon ash: granulated blast-furnace slag: metakaolin=1: (0.27 ~ 2.2): (0 ~ 3): (0 ~ 6.9): (0 ~ 0.3): (0 ~ 0.55): (0 ~ 0.4), and the maximum particle diameter of meticulous aggregate is not more than 0.5 mm; During the varying in weight of meticulous aggregate, flyash, silicon ash, granulated blast-furnace slag, metakaolin is zero.
3. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation, it is characterized in that the said different pile body type that is directed against, and for steel pipe pile, its interface processing may further comprise the steps:
1), whole repairing area is carried out blasting treatment and manual mode is removed surperficial rusty stain and marine organisms attachment;
2), with the pitch arrangement shear connector of 100 ~ 300 mm;
3), to whole reparation district spraying protective coating.
4. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation, it is characterized in that the said different pile body type that is directed against, and for concrete tubular pile, its interface processing may further comprise the steps:
1), clears up the loose part of being corroded;
2), near zone dashed hair handle, remove surperficial laitance, expose fresh interface, and make the interface have the roughness of 3 ~ 5 mm.
5. a kind of repairing and reinforcement as claimed in claim 4 ocean wave spatters the method for district's pile foundation, it is characterized in that, and is said to different pile body types; For concrete tubular pile, if repair layer thickness surpasses 50 mm, then after disposing towards hair; In of the spacing boring of former component surface with 100 ~ 300 mm; Then the hole is cleaned out,, then shear connector is implanted in the hole prefabricated shear connector and hole coated with adhesive.
6. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation; It is characterized in that said end hoop is that thickness is the annular angle steel form of 4 ~ 14 mm; And, guarantee under the working load effect, not topple at a distance from 300 ~ 400 mm laying stiffener; And the position that contacts with pile body on every side is provided with the rubber pad, and it is tight to guarantee that both contact, and stops seawater and gets into.
7. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation, it is characterized in that said external mold is the glass fiber reinforced plastic semicircle mould of common steel semicircle mould or lightweight.
8. a kind of repairing and reinforcement as claimed in claim 1 ocean wave spatters the method for district's pile foundation; The method that it is characterized in that said continuous placing UHTCC is: the UHTCC that stirs is delivered to bottom, reparation district simultaneously through being evenly distributed on pile body 3 ~ 4 soft conduits on every side; Implement the continuous pouring operation, guarantee that the repair layer height rises synchronously around pile body.
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Cited By (11)
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| CN104863063A (en) * | 2015-05-28 | 2015-08-26 | 北京特希达交通设施顾问有限公司 | Bridge underwater structure cofferdam-free fast reinforcing method based on PVC composite formwork |
| CN104929165A (en) * | 2015-06-24 | 2015-09-23 | 张家港英华材料科技有限公司 | Reinforcing and protection system and repair method of hydraulic pile |
| CN105951612A (en) * | 2016-07-01 | 2016-09-21 | 杭州江润科技有限公司 | Defect repairing reinforcing structure for underwater pile head of serving bridge and construction method of defect repairing reinforcing structure |
| CN106122612A (en) * | 2016-08-05 | 2016-11-16 | 杜玮 | A kind of water-tight corrosion-proof construction method of power station pressure pipeline |
| CN106759207A (en) * | 2017-03-01 | 2017-05-31 | 中国建筑第六工程局有限公司 | Steel tubular bank protection structure splash zone antiseptic concrete frock construction method |
| CN106812116A (en) * | 2017-02-16 | 2017-06-09 | 佛山科学技术学院 | A kind of high pile pier structure |
| CN108222089A (en) * | 2018-02-08 | 2018-06-29 | 中交四航工程研究院有限公司 | A kind of underwater wet method prosthetic device of concrete-pile defect and restorative procedure |
| CN108487241A (en) * | 2018-04-03 | 2018-09-04 | 中国矿业大学 | A kind of pile for prestressed pipe for chloride erosion environment |
| CN111485547A (en) * | 2020-06-03 | 2020-08-04 | 山东大学 | Prefabricated horizontal bearing type high-toughness concrete permeable pile and preparation method thereof |
| CN113026837A (en) * | 2021-03-19 | 2021-06-25 | 哈尔滨工业大学 | Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region |
| CN113773009A (en) * | 2021-11-15 | 2021-12-10 | 交通运输部天津水运工程科学研究所 | Repair material and repair method for improving toughness of port high-pile wharf structure |
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| CN104863063A (en) * | 2015-05-28 | 2015-08-26 | 北京特希达交通设施顾问有限公司 | Bridge underwater structure cofferdam-free fast reinforcing method based on PVC composite formwork |
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| CN105951612A (en) * | 2016-07-01 | 2016-09-21 | 杭州江润科技有限公司 | Defect repairing reinforcing structure for underwater pile head of serving bridge and construction method of defect repairing reinforcing structure |
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| CN106812116A (en) * | 2017-02-16 | 2017-06-09 | 佛山科学技术学院 | A kind of high pile pier structure |
| CN106759207A (en) * | 2017-03-01 | 2017-05-31 | 中国建筑第六工程局有限公司 | Steel tubular bank protection structure splash zone antiseptic concrete frock construction method |
| CN108222089A (en) * | 2018-02-08 | 2018-06-29 | 中交四航工程研究院有限公司 | A kind of underwater wet method prosthetic device of concrete-pile defect and restorative procedure |
| CN108487241A (en) * | 2018-04-03 | 2018-09-04 | 中国矿业大学 | A kind of pile for prestressed pipe for chloride erosion environment |
| CN111485547A (en) * | 2020-06-03 | 2020-08-04 | 山东大学 | Prefabricated horizontal bearing type high-toughness concrete permeable pile and preparation method thereof |
| CN113026837A (en) * | 2021-03-19 | 2021-06-25 | 哈尔滨工业大学 | Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region |
| CN113773009A (en) * | 2021-11-15 | 2021-12-10 | 交通运输部天津水运工程科学研究所 | Repair material and repair method for improving toughness of port high-pile wharf structure |
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Application publication date: 20120201 |