CN106812065A - A kind of concrete freely-supported pre-stressed box girder construction process - Google Patents
A kind of concrete freely-supported pre-stressed box girder construction process Download PDFInfo
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- CN106812065A CN106812065A CN201510858602.5A CN201510858602A CN106812065A CN 106812065 A CN106812065 A CN 106812065A CN 201510858602 A CN201510858602 A CN 201510858602A CN 106812065 A CN106812065 A CN 106812065A
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Abstract
The invention provides a kind of concrete freely-supported pre-stressed box girder construction process, it is characterised in that described construction technology step is：Basement process → full hall scaffold is set up and precompressed → bed die and side form installations → colligation beam body bottom web reinforcement → installation bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → mud jacking → remove scaffold and bed die.A kind of the problems such as present invention is directed to existing prestress box beam complicated construction technique, production cost is higher, there is provided the concrete freely-supported pre-stressed box girder construction process of construction quality of raising box beam, accelerating construction progress and reduction engineering cost.
Description
Technical field
The invention belongs to technical field of building construction, and in particular to a kind of concrete freely-supported pre-stressed box girder construction process.
Background technology
With developing rapidly for Chinese national economy and high-speed railway communication, increasing High-speed Passenger Dedicated Lines constantly build up and go into operation.By the end of in December, 2011, China is completed and the speed per hour that has been open to traffic has a series of circuits such as Beijing-Shanghai express railway, military wide high ferro, Zheng Xi high ferros, Shanghai-Hangzhou high ferro, Shanghai and Nanjing high ferro, the wide depth section of wide Shenzhen and Hong Kong high ferro, stone force high ferro Henan Section, Harbin-to-Dalian high ferro, Beijing-Tianjin inter-city in the Line for Passenger Transportation of 300km and the above；Have in the Line for Passenger Transportation of 300km and the above building or debugging speed per hour:Big western high ferro, Beijing-to-Shijiazhuang high ferro, stone force high ferro Hebei Section etc..And in these high-speed railway circuits, because high ferro settlement request standard is high, to account for bridge ratio is very big, wherein in Beijing-Shanghai express railway, circuit overall length 1318km, bridge line length 1060km, accounts for total line 80.7%, military wide high ferro Bridge account for ratio is then higher, hence in so that the concrete freely-supported prestress box beam construction technology that the most high-speed rail bridge of China is used has been studied into necessity.Although concrete freely-supported prestress box beam has rigidity big, anti-impact force is strong, good stability, noise is small, the advantages of being easy to maintaining, but also there is complex structure simultaneously, new technology, it is with high content of technology, own vol is big, weight weight, the features such as width is big is therefore, the prefabricated difficulty of this box beam is larger, used with new material wide, new technology requirement is high, the characteristics of construction is complicated, construction technology has direct and great influence to construction quality, improve the construction quality of box beam, the construction technology that accelerating construction progress and reduction engineering cost must just have, and make its constantly improve, obtain good economic benefit and social benefit.
The content of the invention
A kind of the problems such as technical problems to be solved by the invention are directed to existing prestress box beam complicated construction technique, production cost is higher, there is provided the concrete freely-supported pre-stressed box girder construction process of construction quality of raising box beam, accelerating construction progress and reduction engineering cost.
The technical scheme that present invention solution above-mentioned technical problem is used is as follows：
There is provided a kind of concrete freely-supported pre-stressed box girder construction process, it is characterised in that described construction technology step is：
Basement process → full hall scaffold is set up and precompressed → bed die and side form installations → colligation beam body bottom web reinforcement → installation bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → mud jacking → remove scaffold and bed die, it is first bottom web chamfering that the beam body concrete irrigates technique detailed process, bottom web again, base plate again, epiplastron, last top board again.
This technique is in addition to the requirement of general railroad bridge is met, also meet some special requirements, because under bullet train service condition, the dynamic response aggravation of structure so that the security of train operation, passenger take comfort level, load impact, the fatigue of material, train operation when noise, the durability of structure etc. the problems such as it is all different from common railway.So, bridge structure must have enough strength and stiffness, it is necessary to assure the smooth-going state high of reliable stability and holding bridge upper rail, the bridge structure of high-speed railway is born.This construction technology improves construction quality, accelerating construction progress and the reduction engineering cost of box beam simultaneously.
Further, the mud jacking is vacuum grouting.
Further, the vacuum grouting detailed process is preparation → vacuumize and to configure slurries → mud jacking → stop vacuumizing and cleaning → sealing off and covering anchorage after pressurize → work before mud jacking.
Further, the basement process process is for before scaffold in-situ beam casting, levelling of the land first is carried out to job site, place to setting up scaffold carries out consolidation process, changed in soft base location rubble and fill out or do concrete foundation, ensure that foundation bearing capacity reaches the requirement for being abound with load, sedimentation is not produced after making beam body concreting.Construction site to handling well carries out unwrapping wire, and periphery sets gutter, meets the drainage sunk well requirement on ground.
Further, the full hall scaffold sets up process for bowl buckle scaffold is assembled using external diameter standard member, every vertical rod lower end is all provided with shape disk support or sheeting caps, bridging is set, rod end installs Adjustable U rest, the horizontal lumps of wood is first installed in rest, then longitudinal lumps of wood and stow-wood cushion block are installed by design spacing and absolute altitude, the resistance to overturning of steel pipe is differential settlement, the stability control of supporting structure by basis.Direction across bridge strictly controls the perpendicularity of montant and the quantity and spacing of sweep the floor bar and Crossing brace according to the assembly requirement of support.Connected to scaffold and pier shaft along bridge, with offset along bridge to horizontal force total sub-semigroup be connected with military pier scaffold by steel pipe, the intensity and resistance to overturning of guarantor's combined support.
Further, after the full hand hall scaffold building is good, bed die is laid; carry out preloading pressure testing; to check the bearing capacity of support, reduce and eliminate inelastic deformation and uneven settlement of foundation, the adjustment camber of support, so that it is guaranteed that the pouring quality of beams of concrete.Loading sequence is to be carried out successively to span centre from bearing, and the lotus time is held after being fully loaded with not less than 24h, and the deformation values of scaffold under loads at different levels are measured respectively, is then unloaded step by step again, when the settling amount deviation of scaffold is larger, scaffold is adjusted.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, with reference to embodiments, the present invention is described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included within the scope of the present invention.
Embodiment 1
A kind of concrete freely-supported pre-stressed box girder construction process, it is characterised in that described construction technology step is：
Basement process,Detailed process is for before scaffold in-situ beam casting,Levelling of the land first is carried out to job site,Place to setting up scaffold carries out consolidation process,Changed in soft base location rubble and fill out or do concrete foundation,Construction site to handling well carries out unwrapping wire,Periphery sets gutter → full hall scaffold and sets up and precompressed,Full hall scaffold sets up process for bowl buckle scaffold is assembled using external diameter standard member,Every vertical rod lower end is all provided with shape disk support or sheeting caps,Bridging is set,Rod end installs Adjustable U rest,The horizontal lumps of wood is first installed in rest,Longitudinal lumps of wood and stow-wood cushion block are installed by design spacing and absolute altitude again,Connected to scaffold and pier shaft along bridge,Total sub-semigroup is connected by steel pipe with military pier scaffold,After full hand hall scaffold building is good,Laying bed die,Carry out preloading pressure testing,Loading sequence is to be carried out successively to span centre from bearing,Lotus time 25h is held after fully loaded,The deformation values of scaffold under loads at different levels are measured respectively,Then unload step by step again,When the settling amount deviation of scaffold is larger,Scaffold is adjusted → bed die and side form installations → colligation beam body bottom web reinforcement → installations bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → vacuum grouting detailed process is preparation before mud jacking,Vacuumize and configure slurries,Mud jacking,Stop vacuumizing and pressurize,Cleared up after work,Sealing off and covering anchorage → remove scaffold and bed die,It is first bottom web chamfering that the beam body concrete irrigates technique detailed process,Bottom web again,Base plate again,Epiplastron again,Last top board.
Embodiment 2
Basement process,Detailed process is for before scaffold in-situ beam casting,Levelling of the land first is carried out to job site,Place to setting up scaffold carries out consolidation process,Changed in soft base location rubble and fill out or do concrete foundation,Construction site to handling well carries out unwrapping wire,Periphery sets gutter → full hall scaffold and sets up and precompressed,Full hall scaffold sets up process for bowl buckle scaffold is assembled using external diameter standard member,Every vertical rod lower end is all provided with shape disk support or sheeting caps,Bridging is set,Rod end installs Adjustable U rest,The horizontal lumps of wood is first installed in rest,Longitudinal lumps of wood and stow-wood cushion block are installed by design spacing and absolute altitude again,Connected to scaffold and pier shaft along bridge,Total sub-semigroup is connected by steel pipe with military pier scaffold,After full hand hall scaffold building is good,Laying bed die,Carry out preloading pressure testing,Loading sequence is to be carried out successively to span centre from bearing,Lotus time 30h is held after fully loaded,The deformation values of scaffold under loads at different levels are measured respectively,Then unload step by step again,When the settling amount deviation of scaffold is larger,Scaffold is adjusted → bed die and side form installations → colligation beam body bottom web reinforcement → installations bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → vacuum grouting detailed process is preparation before mud jacking,Vacuumize and configure slurries,Mud jacking,Stop vacuumizing and pressurize,Cleared up after work,Sealing off and covering anchorage → remove scaffold and bed die,It is first bottom web chamfering that the beam body concrete irrigates technique detailed process,Bottom web again,Base plate again,Epiplastron again,Last top board.
Embodiment 3
Basement process,Detailed process is for before scaffold in-situ beam casting,Levelling of the land first is carried out to job site,Place to setting up scaffold carries out consolidation process,Changed in soft base location rubble and fill out or do concrete foundation,Construction site to handling well carries out unwrapping wire,Periphery sets gutter → full hall scaffold and sets up and precompressed,Full hall scaffold sets up process for bowl buckle scaffold is assembled using external diameter standard member,Every vertical rod lower end is all provided with shape disk support or sheeting caps,Bridging is set,Rod end installs Adjustable U rest,The horizontal lumps of wood is first installed in rest,Longitudinal lumps of wood and stow-wood cushion block are installed by design spacing and absolute altitude again,Connected to scaffold and pier shaft along bridge,Total sub-semigroup is connected by steel pipe with military pier scaffold,After full hand hall scaffold building is good,Laying bed die,Carry out preloading pressure testing,Loading sequence is to be carried out successively to span centre from bearing,Lotus time 36h is held after fully loaded,The deformation values of scaffold under loads at different levels are measured respectively,Then unload step by step again,When the settling amount deviation of scaffold is larger,Scaffold is adjusted → bed die and side form installations → colligation beam body bottom web reinforcement → installations bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → vacuum grouting detailed process is preparation before mud jacking,Vacuumize and configure slurries,Mud jacking,Stop vacuumizing and pressurize,Cleared up after work,Sealing off and covering anchorage → remove scaffold and bed die,It is first bottom web chamfering that the beam body concrete irrigates technique detailed process,Bottom web again,Base plate again,Epiplastron again,Last top board.
Claims (6)
1. a kind of concrete freely-supported pre-stressed box girder construction process, it is characterised in that described construction technology step is：
Basement process → full hall scaffold is set up and precompressed → bed die and side form installations → colligation beam body bottom web reinforcement → installation bottom web prestressing force bellows → installation internal model → installation end mould → colligation roof steel bar → installation top board prestressing force bellows → beam body filling concrete → maintenance → take off side form → tensioning → mud jacking → remove scaffold and bed die, it is first bottom web chamfering that the beam body concrete irrigates technique detailed process, bottom web again, base plate again, epiplastron, last top board again.
2. concrete freely-supported pre-stressed box girder construction process according to claim 1, it is characterised in that the mud jacking is vacuum grouting.
3. concrete freely-supported pre-stressed box girder construction process according to claim 2, it is characterised in that the vacuum grouting detailed process is preparation before mud jacking → vacuumize and configures slurries → mud jacking → stop vacuumizing and cleaning → sealing off and covering anchorage after pressurize → work.
4. concrete freely-supported pre-stressed box girder construction process according to claim 1, it is characterized in that, the basement process process is for before scaffold in-situ beam casting, levelling of the land first is carried out to job site, place to setting up scaffold carries out consolidation process, changed in soft base location rubble and fill out or do concrete foundation, the construction site to handling well carries out unwrapping wire, periphery sets gutter.
5. concrete freely-supported pre-stressed box girder construction process according to claim 1, it is characterized in that, the full hall scaffold sets up process for bowl buckle scaffold is assembled using external diameter standard member, every vertical rod lower end is all provided with shape disk support or sheeting caps, bridging is set, rod end installs Adjustable U rest, the horizontal lumps of wood is first installed in rest, longitudinal lumps of wood and stow-wood cushion block are installed by design spacing and absolute altitude again, connected to scaffold and pier shaft along bridge, total sub-semigroup is connected by steel pipe with military pier scaffold.
6. concrete freely-supported pre-stressed box girder construction process according to claim 1, it is characterized in that, after the full hand hall scaffold building is good, bed die is laid, carry out preloading pressure testing, loading sequence is to be carried out successively to span centre from bearing, the lotus time is held after fully loaded not less than 24h, the deformation values of scaffold under loads at different levels are measured respectively, then unloaded step by step again, when the settling amount deviation of scaffold is larger, scaffold is adjusted.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN112832112A (en) * | 2021-01-14 | 2021-05-25 | 中铁四局集团第二工程有限公司 | Pouring and vibrating process for railway machine-made sand concrete box girder |
| CN113430942A (en) * | 2021-06-25 | 2021-09-24 | 中铁十九局集团第五工程有限公司 | Construction method for pouring box girder concrete |
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| KR101249285B1 (en) * | 2011-10-05 | 2013-04-01 | 주식회사 동성엔지니어링 | Bridge with prestressed concrete box girder of cantilever support structure by precast bracket, and it`s construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN112832112A (en) * | 2021-01-14 | 2021-05-25 | 中铁四局集团第二工程有限公司 | Pouring and vibrating process for railway machine-made sand concrete box girder |
| CN113430942A (en) * | 2021-06-25 | 2021-09-24 | 中铁十九局集团第五工程有限公司 | Construction method for pouring box girder concrete |
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Application publication date: 20170609 |