CN103132456A - Construction method for large span girder with cementation pre-stress - Google Patents
Construction method for large span girder with cementation pre-stress Download PDFInfo
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- CN103132456A CN103132456A CN2013100875992A CN201310087599A CN103132456A CN 103132456 A CN103132456 A CN 103132456A CN 2013100875992 A CN2013100875992 A CN 2013100875992A CN 201310087599 A CN201310087599 A CN 201310087599A CN 103132456 A CN103132456 A CN 103132456A
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Abstract
The invention discloses a construction method for a large span girder with cementation pre-stress. The method includes the steps of steel bar binding, corrugated pipe reservation, pre-stress steel blanking, pre-stress steel piercing, concrete pouring, pre-stress steel stretch-draw, duct grouting, end portion sealing and wrapping and the like. With the construction method for the large span girder with the cementation pre-stress, construction is convenient and safe, construction efficiency is high and construction quality is good.
Description
Technical field
The present invention relates to a kind of large span bonded prestressed beam job practices.
Background technology
Existing large span bonded prestressed beam construction, method is complicated, has defective at aspects such as efficiency of construction, safety, construction effects, needs further to improve.
Summary of the invention
The object of the present invention is to provide a kind of easy construction, safety, the measured large span bonded prestressed beam of matter job practices.
Technical solution of the present invention is:
A kind of large span bonded prestressed beam job practices, comprise that staying of reinforcing bar binding, bellows established, presstressed reinforcing steel blanking, presstressed reinforcing steel lashing, concreting, tension of prestressed tendon, duct grouting and end envelope wrap up in, it is characterized in that: (one) reinforcing bar binding:
(1) reinforcing bar binding well draws the presstressed reinforcing steel installation curve afterwards on stirrup;
(2) the first assembling reinforcement of Vierendeel girder and stirrup, colligation is carried out in the lacing wire of beam S type again after presstressed reinforcing steel installs;
(3) during assembling reinforcement, guarantee the correct of prestressed pore passage coordinate position;
(4) when colligation post muscle, guarantee that bellows and steel strand can pass through smoothly;
(5) the colligation floor steel bar, when pipeline is installed, must not mobile bellows and the position of steel strand, must not shrivel bellows;
(2) staying of bellows established
(1) bellows is pressed design attitude and installed fixingly, and its process is as follows: topping at the bottom of colligation Vierendeel girder stirrup and beam steel → processing beam → on stirrup is by duct coordinate position spot welding analog bracket → laying and fixing bellows → installation and mooring anchor backing plate → penetrate steel strand → inspect for acceptance;
(2) after first installation frame beam steel protective layer, can begin fixedly bellows; Connect with bigger bellows between bellows, the connection pipe range is 200mm-350mm, and two ends screw in symmetrically and evenly, and wraps up in seam with the adhesive tape envelope;
(3) slurry outlet is arranged on the position of constraint circle, firmly, vertically;
(4) prestressed girder end anchor backing plate is laid smoothly, firm, and the center in its pre-buried anchor plate hole is concentric with the duct center line, and end face is vertical with the duct center line;
(5) duct stays when establishing coordinate position correct, and the control point error of coordinate should be less than ± 20mm, and horizontal position error must not be greater than ± 20 mm; Get 50 mm at the bottom of the minimum thickness beam of presstressed reinforcing steel topping, beam side-draw 40 mm; Corrugated pipe connector place envelope wraps up in tightly, firmly, spillage not;
(3) presstressed reinforcing steel blanking
The presstressed reinforcing steel blanking in time penetrates the duct in order to avoid gets rusty; The cutting length of presstressed reinforcing steel is: the physical length in duct+stretch-draw active length; The active length of stretching end is got 0. 8 m-1. 0 m;
(4) presstressed reinforcing steel lashing
After bellows is fixed substantially, with the steel strands-woven bundle colligation, and penetrating wire rope socket on termination point casing, penetrate by bundle;
(5) concreting
Concrete delamination vibrates, vibration compacting;
(6) tension of prestressed tendon
(1) concrete strength reaches 100% rear and carries out stretch-draw;
(2) stressing sequence of presstressed reinforcing steel is: 0 → 0.1 σ
con→ 0.60 σ
con→ 1.0 σ
conAnchoring;
(3) the tension of prestressed tendon proof stress is σ
con=0.75f
ptk=0.75 * 1860=1395MPa;
(4) elongation value of stretching is from 0.1 σ
con→ 1.0 σ
con, minute three measurements, and do on-the-spot record;
(7) duct grouting and end envelope is wrapped up in
(1) be in the milk in complete rear 24 hours until the whole stretch-draw of presstressed reinforcing steel.Be in the milk the previous day, end anchorage place's application of pure cement paste or mortar envelope are wrapped up in the space between anchor clipper, only reserve grout hole or venthole;
(2) Grouting Cement intensity is 42.5 Portland cements, and water/binder ratio is 0.4-0.45, mixes the JM3 expansion agent of 6-8%, and degree of mobilization is 12～17cm, the Grouting Cement mechanical agitation; Once fill equably the duct from the grout hole that stretching end is set, treat emerge underflow rear enclosed bleeding hole, other end ground tackle venthole place, and continue to be pressurized to 0.6MPa rear enclosed grout hole;
(3) the end steel strand adopt machine cuts, expose steel strand and keep 30mm; Ground tackle is wrapped up in to protect with the pea gravel concreten envelope in the end.
Easy construction of the present invention, safety, efficiency of construction is high, and construction quality is good.
The invention will be further described below in conjunction with embodiment.
The specific embodiment
A kind of large span bonded prestressed beam job practices comprises that staying of reinforcing bar binding, bellows established, presstressed reinforcing steel blanking, presstressed reinforcing steel lashing, concreting, tension of prestressed tendon, duct grouting and end envelope wrap up in; (1) reinforcing bar binding:
(1) reinforcing bar binding well draws the presstressed reinforcing steel installation curve afterwards on stirrup;
(2) the first assembling reinforcement of Vierendeel girder and stirrup, colligation is carried out in the lacing wire of beam S type again after presstressed reinforcing steel installs;
(3) during assembling reinforcement, guarantee the correct of prestressed pore passage coordinate position;
(4) when colligation post muscle, guarantee that bellows and steel strand can pass through smoothly;
(5) the colligation floor steel bar, when pipeline is installed, must not mobile bellows and the position of steel strand, must not shrivel bellows;
(2) staying of bellows established
(1) bellows is pressed design attitude and installed fixingly, and its process is as follows: topping at the bottom of colligation Vierendeel girder stirrup and beam steel → processing beam → on stirrup is by duct coordinate position spot welding analog bracket → laying and fixing bellows → installation and mooring anchor backing plate → penetrate steel strand → inspect for acceptance;
(2) after first installation frame beam steel protective layer, can begin fixedly bellows; Connect with bigger bellows between bellows, the connection pipe range is 200mm-350mm, and two ends screw in symmetrically and evenly, and wraps up in seam with the adhesive tape envelope;
(3) slurry outlet is arranged on the position of constraint circle, firmly, vertically;
(4) prestressed girder end anchor backing plate is laid smoothly, firm, and the center in its pre-buried anchor plate hole is concentric with the duct center line, and end face is vertical with the duct center line;
(5) duct stays when establishing coordinate position correct, and the control point error of coordinate should be less than ± 20mm, and horizontal position error must not be greater than ± 20 mm; Get 50 mm at the bottom of the minimum thickness beam of presstressed reinforcing steel topping, beam side-draw 40 mm; Corrugated pipe connector place envelope wraps up in tightly, firmly, spillage not;
(3) presstressed reinforcing steel blanking
The presstressed reinforcing steel blanking in time penetrates the duct in order to avoid gets rusty; The cutting length of presstressed reinforcing steel is: the physical length in duct+stretch-draw active length; The active length of stretching end is got 0. 8 m-1. 0 m;
(4) presstressed reinforcing steel lashing
After bellows is fixed substantially, with the steel strands-woven bundle colligation, and penetrating wire rope socket on termination point casing, penetrate by bundle;
(5) concreting
Concrete delamination vibrates, vibration compacting;
(6) tension of prestressed tendon
(1) concrete strength reaches 100% rear and carries out stretch-draw;
(2) stressing sequence of presstressed reinforcing steel is: 0 → 0.1 σ
con→ 0.60 σ
con→ 1.0 σ
conAnchoring;
(3) the tension of prestressed tendon proof stress is σ
con=0.75f
ptk=0.75 * 1860=1395MPa;
(4) elongation value of stretching is from 0.1 σ
con→ 1.0 σ
con, minute three measurements, and do on-the-spot record;
(7) duct grouting and end envelope is wrapped up in
(1) be in the milk in complete rear 24 hours until the whole stretch-draw of presstressed reinforcing steel.Be in the milk the previous day, end anchorage place's application of pure cement paste or mortar envelope are wrapped up in the space between anchor clipper, only reserve grout hole or venthole;
(2) Grouting Cement intensity is 42.5 Portland cements, and water/binder ratio is 0.4-0.45, mixes the JM3 expansion agent of 6-8%, and degree of mobilization is 12～17cm, the Grouting Cement mechanical agitation; Once fill equably the duct from the grout hole that stretching end is set, treat emerge underflow rear enclosed bleeding hole, other end ground tackle venthole place, and continue to be pressurized to 0.6MPa rear enclosed grout hole;
(3) the end steel strand adopt machine cuts, expose steel strand and keep 30mm; Ground tackle is wrapped up in to protect with the pea gravel concreten envelope in the end.
Claims (1)
1. large span bonded prestressed beam job practices, comprise that staying of reinforcing bar binding, bellows established, presstressed reinforcing steel blanking, presstressed reinforcing steel lashing, concreting, tension of prestressed tendon, duct grouting and end envelope wrap up in, it is characterized in that: (one) reinforcing bar binding:
(1) reinforcing bar binding well draws the presstressed reinforcing steel installation curve afterwards on stirrup;
(2) the first assembling reinforcement of Vierendeel girder and stirrup, colligation is carried out in the lacing wire of beam S type again after presstressed reinforcing steel installs;
(3) during assembling reinforcement, guarantee the correct of prestressed pore passage coordinate position;
(4) when colligation post muscle, guarantee that bellows and steel strand can pass through smoothly;
(5) the colligation floor steel bar, when pipeline is installed, must not mobile bellows and the position of steel strand, must not shrivel bellows;
(2) staying of bellows established
(1) bellows is pressed design attitude and installed fixingly, and its process is as follows: topping at the bottom of colligation Vierendeel girder stirrup and beam steel → processing beam → on stirrup is by duct coordinate position spot welding analog bracket → laying and fixing bellows → installation and mooring anchor backing plate → penetrate steel strand → inspect for acceptance;
(2) after first installation frame beam steel protective layer, can begin fixedly bellows; Connect with bigger bellows between bellows, the connection pipe range is 200mm-350mm, and two ends screw in symmetrically and evenly, and wraps up in seam with the adhesive tape envelope;
(3) slurry outlet is arranged on the position of constraint circle, firmly, vertically;
(4) prestressed girder end anchor backing plate is laid smoothly, firm, and the center in its pre-buried anchor plate hole is concentric with the duct center line, and end face is vertical with the duct center line;
(5) duct stays when establishing coordinate position correct, and the control point error of coordinate should be less than ± 20mm, and horizontal position error must not be greater than ± 20 mm; Get 50 mm at the bottom of the minimum thickness beam of presstressed reinforcing steel topping, beam side-draw 40 mm; Corrugated pipe connector place envelope wraps up in tightly, firmly, spillage not;
(3) presstressed reinforcing steel blanking
The presstressed reinforcing steel blanking in time penetrates the duct in order to avoid gets rusty; The cutting length of presstressed reinforcing steel is: the physical length in duct+stretch-draw active length; The active length of stretching end is got 0. 8 m-1. 0 m;
(4) presstressed reinforcing steel lashing
After bellows is fixed substantially, with the steel strands-woven bundle colligation, and penetrating wire rope socket on termination point casing, penetrate by bundle;
(5) concreting
Concrete delamination vibrates, vibration compacting;
(6) tension of prestressed tendon
(1) concrete strength reaches 100% rear and carries out stretch-draw;
(2) stressing sequence of presstressed reinforcing steel is: 0 → 0.1 σ
con→ 0.60 σ
con→ 1.0 σ
conAnchoring;
(3) the tension of prestressed tendon proof stress is σ
con=0.75f
ptk=0.75 * 1860=1395MPa;
(4) elongation value of stretching is from 0.1 σ
con→ 1.0 σ
con, minute three measurements, and do on-the-spot record;
(7) duct grouting and end envelope is wrapped up in
(1) be in the milk in complete rear 24 hours until the whole stretch-draw of presstressed reinforcing steel.Be in the milk the previous day, end anchorage place's application of pure cement paste or mortar envelope are wrapped up in the space between anchor clipper, only reserve grout hole or venthole;
(2) Grouting Cement intensity is 42.5 Portland cements, and water/binder ratio is 0.4-0.45, mixes the JM3 expansion agent of 6-8%, and degree of mobilization is 12～17cm, the Grouting Cement mechanical agitation; Once fill equably the duct from the grout hole that stretching end is set, treat emerge underflow rear enclosed bleeding hole, other end ground tackle venthole place, and continue to be pressurized to 0.6MPa rear enclosed grout hole;
(3) the end steel strand adopt machine cuts, expose steel strand and keep 30mm; Ground tackle is wrapped up in to protect with the pea gravel concreten envelope in the end.
Priority Applications (1)
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| CN2013100875992A CN103132456A (en) | 2013-03-19 | 2013-03-19 | Construction method for large span girder with cementation pre-stress |
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| CN2013100875992A CN103132456A (en) | 2013-03-19 | 2013-03-19 | Construction method for large span girder with cementation pre-stress |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410329A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN106522561A (en) * | 2016-11-02 | 2017-03-22 | 中建八局第三建设有限公司 | Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method |
| CN109898546A (en) * | 2019-03-25 | 2019-06-18 | 五冶集团上海有限公司 | A kind of raw material mill vertical prestressing steel strand wires bellows mounting and fixing support |
| CN112647706A (en) * | 2020-07-28 | 2021-04-13 | 安宜建设集团有限公司 | Construction method for long-span concrete beam slow-bonding prestress |
| CN112942444A (en) * | 2021-02-02 | 2021-06-11 | 金华职业技术学院 | Self-cracking-resistant rigid landfill reinforced concrete bottom plate and construction process thereof |
| CN113107129A (en) * | 2021-04-20 | 2021-07-13 | 中国建筑第七工程局有限公司 | Super high-rise post-tensioning method bonded prestressed beamless floor construction method |
| CN115262626A (en) * | 2022-06-24 | 2022-11-01 | 中铁第四勘察设计院集团有限公司 | Construction method of underground space prestress steel reinforced concrete top cover under super-large span heavy load |
| CN116695566A (en) * | 2023-05-12 | 2023-09-05 | 中建八局第三建设有限公司 | Tensioning construction process of prestressed concrete beam |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410329A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN103410329B (en) * | 2013-08-30 | 2015-04-15 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN106522561A (en) * | 2016-11-02 | 2017-03-22 | 中建八局第三建设有限公司 | Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method |
| CN106522561B (en) * | 2016-11-02 | 2018-12-14 | 中建八局第三建设有限公司 | Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip |
| CN109898546A (en) * | 2019-03-25 | 2019-06-18 | 五冶集团上海有限公司 | A kind of raw material mill vertical prestressing steel strand wires bellows mounting and fixing support |
| CN112647706A (en) * | 2020-07-28 | 2021-04-13 | 安宜建设集团有限公司 | Construction method for long-span concrete beam slow-bonding prestress |
| CN112942444A (en) * | 2021-02-02 | 2021-06-11 | 金华职业技术学院 | Self-cracking-resistant rigid landfill reinforced concrete bottom plate and construction process thereof |
| CN113107129A (en) * | 2021-04-20 | 2021-07-13 | 中国建筑第七工程局有限公司 | Super high-rise post-tensioning method bonded prestressed beamless floor construction method |
| CN115262626A (en) * | 2022-06-24 | 2022-11-01 | 中铁第四勘察设计院集团有限公司 | Construction method of underground space prestress steel reinforced concrete top cover under super-large span heavy load |
| CN115262626B (en) * | 2022-06-24 | 2023-12-01 | 中铁第四勘察设计院集团有限公司 | Construction method of underground space prestress steel reinforced concrete top cover under ultra-large span heavy load |
| CN116695566A (en) * | 2023-05-12 | 2023-09-05 | 中建八局第三建设有限公司 | Tensioning construction process of prestressed concrete beam |
| CN116695566B (en) * | 2023-05-12 | 2024-04-09 | 中建八局第三建设有限公司 | Tensioning construction process of prestressed concrete beam |
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Application publication date: 20130605 |