CN1900465A - Prestress hole path pressure grouting construction process by post-tensioning method - Google Patents
Prestress hole path pressure grouting construction process by post-tensioning method Download PDFInfo
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- CN1900465A CN1900465A CN 200610059002 CN200610059002A CN1900465A CN 1900465 A CN1900465 A CN 1900465A CN 200610059002 CN200610059002 CN 200610059002 CN 200610059002 A CN200610059002 A CN 200610059002A CN 1900465 A CN1900465 A CN 1900465A
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- mortar
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Abstract
The construction technique includes following procedures: on the eve of laying pre stress pipe, painting a layer of epoxy resin mortar with thickness not less than one centimeter on wire dense mesh; wrapping the prepared wire dense mesh on external wall of metal bellows; having laid pre stress pipe before initial set of epoxy resin mortar; installing connection steel tubes, control valve, pulp press with meter, and pulp blending machine at one end of pipe, and installing connection steel tubes, viewer, control valve, barometer, and suction vacuum pump; sealing pipe joint by sealant, and starting up pump; turning valve to open when pressure inside pipe at negative pressure 2-3MPa so as to start mudjacking operation. Pump and pulp press are running without stop in order to prevent tunnel from air leak till pushed pulp fills up tunnel.
Description
Technical field
The present invention is that a kind of prestress hole path pressure grouting construction process by post-tensioning method belongs to the post-stressed concrete mud jacking of works construction technologies (method) such as bridge.
Background technology
No matter be building or structure in the past, no matter also be high buildings and large mansions, or modernized bridge, prestress concrete when building them, mostly adopt post-stressed concrete structural member, draw ability, prevent that the crack from appearring in works too early with the intensity, rigidity and the bending resistance thereof that improve works.The mud jacking leakiness appears in steel bar concrete prestressing force bridge both at home and abroad, decades are even after the several years, prestressed reinforcement or steel strand corrosion fracture make the bridge main body structure stride the accident of collapsing and happen occasionally, and its main cause is that post-stressed concrete hole path pressure grouting leakiness when construction causes.
Summary of the invention
Technical problem to be solved by this invention, provide a kind of construction technology (method), be in post-stressed concrete work progress, adopt the aperture of enlarged metal bellow, the aperture of its metal bellow than steel wire bundle enlarged-diameter to 2--3 centimetre, to reduce the resistance of hole path pressure grouting, increase the mortar cover of steel wire bundle; Lay the eve at prestress pipe, even brushing one deck epoxy mortar on dense mesh, brushing thickness is not less than 1 centimetre, to be wrapped in metal bellow outer wall with the dense mesh of epoxy mortar, accomplish the closely connected no bubble of epoxy mortar and metal bellow during parcel, in the outside of dense mesh every the 30--50 centimetre of a branch of thin wire of colligation, prevent that dense mesh from unclamping, epoxy mortar comes off, before the epoxy mortar initial set, laid prestress pipe, pipe joint place is with being no less than 50 centimetres wide dense mesh parcels with epoxy mortar, every limit, joint is no less than 25 centimetres, and uses the thin wire colligation.The purpose of brushing epoxy mortar is to guarantee the complete sealed air-tight of metal bellow, and the purpose of wire gauze is to improve the bond stress of metal bellow and concrete.Ground tackle is installed is evenly coated special seal gum, after steel wire bundle stretch-draw is finished, the dust in the duct or other foreign material are blown clean, excise unnecessary steel strand, use the epoxy mortar sealing off and covering anchorage closely knit again with the high pressure draught of air compressor machine at ground tackle and anchor plate contact position.Install connection steel pipe, control valve, flow meter, be with manometric pneumatic mortar machine and slurrying mixer at the mud jacking arrival end of anchor plate, the mud jacking port of export of anchor plate is installed and is connected steel pipe, viewer, control valve, air gauge and the vacuum pump of bleeding, all pipe joints are all sealed with fluid sealant, close the valve of mud jacking end, start the vacuum pump of bleeding, air in the duct is pumped into negative pressure 2-3Mpa, opens valve, the beginning mud jacking.For preventing that the duct is long or small leak arranged, vacuum pump not stop pumping on one side gas then, the pneumatic mortar machine of the other end does not stop mud jacking, guarantees that cement paste full section in pipeline advances, till the duct is full of by cement paste mixture fully.The cement paste mixture that mud jacking is used adopts cement, micro-expanding agent, glue, fine sand, water and Admixture (as water reducing agent), carries out the match ratio design according to the intensity of designing requirement.
The present invention has following advantage:
(1) can avoid conventional pipelines mud jacking leakiness, thereby cause bridge span structure to occur the crack too early, empty G﹠W enters prestress pipe, the quality accidents that causes prestress wire corrosion fracture to cause bridge span structure to stride to collapse;
(2) improve the construction quality of pipeline pneumatic mortar greatly, solved this difficult problem of post stretching pipeline pneumatic mortar leakiness, the durability and the safety that have improved the prestressed structure thing;
(3) facility such as construction equipment such as mudjack, vacuum air pump, mud jacking pipeline design easily, assemble and check;
(4) wrapped up one deck epoxy mortar in the metal bellow outside, avoided in the past nonprestressed reinforcement in welding process, to fly low-priced electric welding quarrel and burnt broken metal bellow, caused metal bellow spillage, thereby influence prestressed stretch-draw.
(5) with the metal bellow of the dense mesh parcel of having epoxy mortar, increased intensity, rigidity and the toughness of metal bellow, effectively prevented concrete metal bellow failure by rupture in process is vibrated in cast of works.
In a word, the present invention can overcome the construction shortcoming of traditional handicraft, has solved this difficult problem of post-tensioned prestressing pipeline mud jacking leakiness, has improved the antiseptic power of prestress wire, has improved the application life of works such as bridge and the safety reliability of use.
Description of drawings
Fig. 1 is a kind of construction flow chart of post-stressed hole path pressure grouting technology." non-answer in advance the colligation of muscles and bones frame ", " welding of prestress pipe arc positioning bar " are a kind of upper track sequences of construction of post-stressed hole path pressure grouting technology; " preparation of epoxy mortar ", " at brushing epoxy mortar on the dense mesh ", " wrapping up epoxy mortar on metal bellows " are that metal bellows is sealed, be a kind of main technique of post-stressed hole path pressure grouting technology, and the effect of wire gauze is to increase the concrete of works and the bond stress of metal bellows; " at dense mesh outside colligation thin wire " is the dense mesh loose or dislocation that prevents parcel epoxy mortar on the metal bellows; " prestress pipe is laid and be fixing " is to be installed on the nonprestressed reinforcement skeleton according to the metal bellows that the requirement of design and technical specification will be handled; " laying of pipe joint processing and venthole " is that pipe joint and pipeline and escape pipe joint are sealed, and venthole is arranged in the extreme higher position of curve pipeline; " template ", " building concrete ", " wearing prestressing tendon ", " concrete health ", " prestressed stretch-draw " are the middle working procedures of this technology; " pipeline blowing dedusting " is with foreign material and dust in the air blast blowing pipeline of blast fan; " mud jacking hole and slurry outlet are installed and be connected steel pipe " is to be connected with slurry outlet with the mud jacking hole respectively and to seal with special steel pipe, and mud jacking hole and slurry outlet are blocked when preventing sealing off and covering anchorage; " excise unnecessary prestressing tendon sealing off and covering anchorage sealing " use the epoxy mortar sealing off and covering anchorage; " installation pneumatic mortar machine, mixer and aspiration pump " is meant the pneumatic mortar machine and the forced mixer of be installed in series respectively valve, flow meter, band hydralic pressure gauge on the connection steel pipe of mud jacking nose end, viewer valve air gauge and aspiration pump are installed in series respectively on the connection steel pipe of pulp nose end; " preparation cement paste " is that the quality of pacifying according to designing requirement prepares the required cement paste of mud jacking; " tightness of sealing venthole, check system " is that the valve closing startup aspiration pump of venthole obstruction, mud jacking end is checked by barometric reading whether channel system leaks gas; " starting aspiration pump bleeds " is that the air in the pipeline is pumped into negative pressure, and be general-2～3Mpa; " starting the mudjack mud jacking " is that the valve of opening the mud jacking end carries out uninterrupted mud jacking; Whether " open venthole check mud jacking closely knit " is that the viewer of slurry output end has magma the venthole lid to occur opening immediately to check in the escape pipe whether have magma to emerge; " voltage stabilizing to venthole, slurry outlet emerge magma " is the density that further improves hole path pressure grouting; " removing mud jacking equipment closed orifices " is last one working procedure of this technology.
Fig. 2 is a kind of schematic diagram of prestress hole path pressure grouting construction process by post-tensioning method.The 1-aspiration pump; The 2-air gauge; The 3-valve; The 4-slurry outlet connects steel pipe; The metal bellow that 5-wraps up with the dense mesh with epoxy mortar; The 6-venthole; 7-mud jacking hole connects steel pipe; The 8-hydralic pressure gauge; The 9-connecting pipe; The 10-prestressed girder; The 11-valve; 12-connects high pressure resistant rubber tube; The 13-mudjack; 14-connects rubber tube; The 15-forced mixer; The 17-ground tackle; The 18-viewer; The 19-flow meter.
Fig. 3 is a kind of schematic diagram I-I sectional drawing of prestress hole path pressure grouting construction process by post-tensioning method.The metal bellow that 5-wraps up with the dense mesh with epoxy mortar; 16-prestress steel twist wire harness; The 20-non-prestressing tendon.
The specific embodiment
A kind of prestress hole path pressure grouting construction process by post-tensioning method, be in post-stressed concrete work progress, adopt the aperture of enlarged metal bellow, the aperture of its metal bellow than 16-steel wire bundle enlarged-diameter to 2--3 centimetre, to reduce the resistance of hole path pressure grouting, increase the mortar cover of 16-steel wire bundle; Lay the eve at prestress pipe, even brushing one deck epoxy mortar on dense mesh, brushing thickness is not less than 1 centimetre, to be wrapped in metal bellow outer wall with the dense mesh of epoxy mortar, accomplish the closely connected no bubble of epoxy mortar and metal bellow during parcel, in the outside of dense mesh every the 30--50 centimetre of a branch of thin wire of colligation, prevent that dense mesh from unclamping, epoxy mortar comes off, before the epoxy mortar initial set, laid the 5-prestress pipe, pipe joint place is with being no less than 50 centimetres wide dense mesh parcels with epoxy mortar, every limit, joint is no less than 25 centimetres, and uses the thin wire colligation.The purpose of brushing epoxy mortar is to guarantee the complete sealed air-tight of metal bellow, and the purpose of wire gauze is to improve the bond stress of metal bellow and concrete.Ground tackle is installed is evenly coated special seal gum at 17-ground tackle and anchor plate contact position, after the stretch-draw of 16-steel wire bundle is finished, high pressure draught with air compressor machine blows clean the dust in the duct or other foreign material, excises unnecessary steel strand, uses the epoxy mortar sealing off and covering anchorage closely knit again.Install 7-at the mud jacking arrival end of anchor plate and connect steel pipe, 11-control valve, 19-flow meter, the band manometric 13-pneumatic mortar machine of 8-and 15-slurrying mixer, the mud jacking port of export of anchor plate is installed 4-and is connected steel pipe, 18-viewer, 3-control valve, 2-air gauge and the 1-vacuum pump of bleeding, all pipe joints are all sealed with fluid sealant, close the 11-valve of mud jacking end, start the 1-vacuum pump of bleeding, air in the duct is pumped into negative pressure 2-3Mpa, opens the 11-valve, the beginning mud jacking.For preventing that the duct is long or small leak arranged, 1-vacuum pump not stop pumping on one side gas then, the 15-pneumatic mortar machine of the other end does not stop mud jacking, guarantees that cement paste full section in pipeline advances, till the duct is full of by cement paste mixture fully.The cement paste mixture that mud jacking is used adopts cement, micro-expanding agent, glue, fine sand, water and Admixture (as water reducing agent), carries out the match ratio design according to the intensity of designing requirement.Quality and quantity by designing requirement before the mud jacking prepare cement paste, accomplish without any letup to guarantee mud jacking, when the 18-viewer has magma to occur, close the 3-control valve, open 6-venthole lid, continue mud jacking, till the 6-venthole is full of magma.Dismounting is bled and mud jacking equipment, access, plugging hole road.
Lift following specific embodiment
No. 48 crossbeams of overhead eastern section, the Wenshui River road, Middle Ring Line, Shanghai City (A2.5 mark) engineering left side width of cloth case beam, prestressing tendon three roads are arranged, 15.5 meters of beam lengths, select the metal bellow of 6 centimetres of diameters for use, prestressing tendon is made up of seven steel strand, prestress pipe is presented arc, every pipeline is grown 15.9 meters, the preparation epoxy mortar, even brushing epoxy mortar on close order thin wire gauze, brushing thickness is 1 centimetre, to be wrapped in metal bellow outer wall with the dense mesh of epoxy mortar, accomplish the closely connected no bubble of epoxy mortar and metal bellow during parcel, every the 30--50 centimetre of a branch of thin wire of colligation, on non-prestressing tendon, lay the metal bellow of 5-immediately with the dense mesh parcel of epoxy mortar in the outside of dense mesh; Arrange 6-venthole pipeline at curve pipeline highest point, with dense mesh pipe joint is sealed with epoxy mortar, the welding U-shaped fastens prestress pipe, after the cage of reinforcement passed examination, prop up template, water concrete, wear the 16-steel wire bundle, the 17-ground tackle is installed, fluid sealant is evenly smeared on mating face at ground tackle and anchor plate, after treating that prestressed stretch-draw is finished, high pressure draught with air compressor machine blows clean the dust in the duct or other foreign material, excise unnecessary steel strand, use the epoxy mortar sealing off and covering anchorage closely knit again.Install 7-at the mud jacking arrival end of anchor plate and connect steel pipe, 11-control valve, 19-flow meter, the band manometric 13-pneumatic mortar machine of 8-and 15-slurrying mixer, the mud jacking port of export of anchor plate is installed 4-and is connected steel pipe, 18-viewer, 3-control valve, 2-air gauge and the 1-vacuum pump of bleeding, and all pipe joints are all sealed with fluid sealant.Quality and quantity by designing requirement before the mud jacking prepare cement paste, the cement paste mixture that mud jacking is used adopts cement: glue: fine sand: water=1: 0.02: 0.5: 0.38, micro-expanding agent be ten thousand of cement consumption/, water reducing agent is one of percentage of cement consumption, the two is outer mixing.For guaranteeing that mud jacking accomplishs without any letup, every pipeline theory need be used 29352 milliliters of cement pastes, considers the shared cement paste consumption of loss and service pipe, 35222 milliliters of actual fabrication cement pastes.Close the 11-valve of mud jacking end, start the 1-vacuum pump of bleeding, the air in the duct is pumped into negative pressure 2.5Mpa, open the 11-valve, the beginning mud jacking.For preventing that from there is small leak in the duct, 1-vacuum pump not stop pumping gas on one side then, the 15-pneumatic mortar machine of the other end does not stop mud jacking, guarantees that cement paste full section in pipeline advances, till the duct is full of by cement paste mixture fully.When the 18-viewer has magma to occur, close the 3-control valve, open 6-venthole lid, continue mud jacking, till the 6-venthole is full of magma.Check that the 19-meter readings is 29898 milliliters, consider the shared cement paste consumption of venthole and service pipe, actual value and theoretical value match.Dismounting is bled and mud jacking equipment, and next hole path pressure grouting is carried out in access, plugging hole road.
Claims (3)
1. on close order thin wire gauze, evenly brush a layer thickness and be not less than 1 centimetre polyester mortar, the polyester mortar is wrapped in the wavy metal tube-surface with close order thin wire gauze, and then lay bellows, in case solidifying the back bellows, the polyester mortar lays difficulty, especially curve prestress pipe.The polyester mortar plays the seal bellows effect, and thin wire gauze works to increase the bellows bond stress.
2. at duct slurry output end assembling viewer, valve, air gauge and vacuum air pump; Pneumatic mortar machine and forced mixer at hole path pressure grouting end assembling valve, flow meter, band hydralic pressure gauge.Start vacuum air pump and bleed to make and form big negative pressure in the duct in, open mudjack immediately and do not stop mud jacking fast, guarantee slurries in the duct full section pour into, till the duct is full of slurries.
3. construction technology: the preparation → brushing epoxy mortar on close order thin wire gauze of nonprestressed reinforcement skeleton colligation → prestress pipe arc positioning bar welding → epoxy mortar → on metal bellows, wrap up epoxy mortar → lay and fixing → pipe joint processing and venthole are arranged → template → build concrete → wear prestressing tendon → concrete curing → prestressed stretch-draw → pipeline blowing dedusting → mud jacking hole to install with slurry outlet and be connected the unnecessary steel wire bundle sealing off and covering anchorage of steel pipe → cutting sealing → installation pneumatic mortar machine at close order thin wire gauze outside colligation thin wire → prestress pipe, mixer and aspiration pump → preparation cement paste → sealing venthole, check system tightness → startup aspiration pump bleed → start mudjack mud jacking → open venthole check whether mud jacking closely knit → voltage stabilizing is until venthole, slurry outlet magma → dismounting mud jacking equipment the closed orifices of emerging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610059002 CN1900465A (en) | 2005-10-11 | 2006-02-23 | Prestress hole path pressure grouting construction process by post-tensioning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510113066.2 | 2005-10-11 | ||
| CN200510113066 | 2005-10-11 | ||
| CN 200610059002 CN1900465A (en) | 2005-10-11 | 2006-02-23 | Prestress hole path pressure grouting construction process by post-tensioning method |
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| CN1900465A true CN1900465A (en) | 2007-01-24 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798874A (en) * | 2010-03-08 | 2010-08-11 | 东南大学 | Pre-stress construction method of parallel steel stranded wire assembled cable in annular sealed steel pipe |
| CN102011366B (en) * | 2009-12-29 | 2011-11-16 | 中交第一航务工程局有限公司 | Construction method for mud jacking of post-tensioning pre-stressed concrete box girder pipe |
| CN102877415A (en) * | 2012-10-26 | 2013-01-16 | 上海市城市建设设计研究总院 | Ultra-high-difference, ultra-long and ultra-large-tonnage prestress pipeline grouting method and herring-bone pipe bundle |
| CN103031809A (en) * | 2011-09-29 | 2013-04-10 | 李跃军 | Prestress hole channel grouting quality control method based on double parameters of flow and density |
| CN103147400A (en) * | 2013-03-01 | 2013-06-12 | 天津第四市政建筑工程有限公司 | One-time tensioning construction method of super-long prestressed tendon for cast-in-place box girder bridge web |
| CN103485545A (en) * | 2013-09-13 | 2014-01-01 | 中南林业科技大学 | Unbonded prestressing steel strand try disassembling and re-anchoring construction method |
| CN107130495A (en) * | 2017-05-16 | 2017-09-05 | 浙江交通职业技术学院 | A kind of pavement crack vacuum cementation of fissures method and apparatus |
| CN108643045A (en) * | 2018-04-27 | 2018-10-12 | 谢小红 | A kind of post-stressed hole path pressure grouting technique |
| CN110056126A (en) * | 2019-04-18 | 2019-07-26 | 江苏广兴集团建筑装配科技有限公司 | A kind of reinforced composite beam of loss of weight |
| CN110374004A (en) * | 2019-07-10 | 2019-10-25 | 江苏镇江路桥工程有限公司 | A kind of presstressed reinforcing steel mud-jacking technology |
| CN112502048A (en) * | 2020-12-08 | 2021-03-16 | 云南省建设投资控股集团有限公司 | Highway T roof beam hogging moment slip casting exhaust observation pipe |
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2006
- 2006-02-23 CN CN 200610059002 patent/CN1900465A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011366B (en) * | 2009-12-29 | 2011-11-16 | 中交第一航务工程局有限公司 | Construction method for mud jacking of post-tensioning pre-stressed concrete box girder pipe |
| CN101798874A (en) * | 2010-03-08 | 2010-08-11 | 东南大学 | Pre-stress construction method of parallel steel stranded wire assembled cable in annular sealed steel pipe |
| CN103031809A (en) * | 2011-09-29 | 2013-04-10 | 李跃军 | Prestress hole channel grouting quality control method based on double parameters of flow and density |
| CN102877415B (en) * | 2012-10-26 | 2014-07-09 | 上海市城市建设设计研究总院 | Ultra-high-difference, ultra-long and ultra-large-tonnage prestress pipeline grouting method and herring-bone pipe bundle |
| CN102877415A (en) * | 2012-10-26 | 2013-01-16 | 上海市城市建设设计研究总院 | Ultra-high-difference, ultra-long and ultra-large-tonnage prestress pipeline grouting method and herring-bone pipe bundle |
| CN103147400A (en) * | 2013-03-01 | 2013-06-12 | 天津第四市政建筑工程有限公司 | One-time tensioning construction method of super-long prestressed tendon for cast-in-place box girder bridge web |
| CN103485545A (en) * | 2013-09-13 | 2014-01-01 | 中南林业科技大学 | Unbonded prestressing steel strand try disassembling and re-anchoring construction method |
| CN103485545B (en) * | 2013-09-13 | 2016-01-20 | 中南林业科技大学 | The method of anchor construction is torn in a kind of un-bonded prestressed steel strand examination open again |
| CN107130495A (en) * | 2017-05-16 | 2017-09-05 | 浙江交通职业技术学院 | A kind of pavement crack vacuum cementation of fissures method and apparatus |
| CN108643045A (en) * | 2018-04-27 | 2018-10-12 | 谢小红 | A kind of post-stressed hole path pressure grouting technique |
| CN108643045B (en) * | 2018-04-27 | 2019-11-19 | 谢小红 | A kind of post-stressed hole path pressure grouting technique |
| CN110056126A (en) * | 2019-04-18 | 2019-07-26 | 江苏广兴集团建筑装配科技有限公司 | A kind of reinforced composite beam of loss of weight |
| CN110056126B (en) * | 2019-04-18 | 2021-06-22 | 江苏广兴集团建筑装配科技有限公司 | Weight-reducing reinforced composite beam |
| CN110374004A (en) * | 2019-07-10 | 2019-10-25 | 江苏镇江路桥工程有限公司 | A kind of presstressed reinforcing steel mud-jacking technology |
| CN112502048A (en) * | 2020-12-08 | 2021-03-16 | 云南省建设投资控股集团有限公司 | Highway T roof beam hogging moment slip casting exhaust observation pipe |
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