CN105780662A - Large-span support deflection control construction method - Google Patents
Large-span support deflection control construction method Download PDFInfo
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- CN105780662A CN105780662A CN201610213775.6A CN201610213775A CN105780662A CN 105780662 A CN105780662 A CN 105780662A CN 201610213775 A CN201610213775 A CN 201610213775A CN 105780662 A CN105780662 A CN 105780662A
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- concrete beam
- beam body
- end bay
- span
- deflection
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a large-span support deflection control construction method.The method includes following steps: according to construction design requirements, constructing a foundation pile, and setting up a support platform on the foundation pile; pouring a concrete beam on the support platform in a three-section manner: pouring a two-side-span concrete beam, and tensioning temporary outer beam prestress of the two-side-span concrete beam, namely tensioning two ends of each temporary prestressed bundle in the two-side-span concrete beam according to tension force of 15-18T; pouring a middle-span concrete beam, and tensioning prestress of the whole concrete beam; removing the temporary outer beam prestress applied on the two-side-span concrete beam.The method has the advantages that compared with conventional support construction processes, the problem that large-span construction cannot be implemented due to deflection index of a support structure can be solved; compared with one-time integral pouring, quantity of concrete for sectional pouring of the beam is reduced, so that construction quality of concrete is easier to control.
Description
Technical field
The invention belongs to technical field of bridge engineering, be specifically related to a kind of Long span support amount of deflection and control construction method.
Background technology
For building concrete beam on support, it it is a kind of method conventional in bridge construction.There is the features such as stress is clear and definite, convenient, simple and easy, material is easy to get by land.But for crossing over river and by navigation waterborne, the high restriction of building limit, it is necessary to find and can have the relatively large method across footpath, namely amount of deflection controls to be necessarily less than L/400.Wherein, the simple rack that beret truss is formed is one of first-selected method.
But, conventional monolayer beret truss be suitable for across footpath scope, be typically less than 18M in the majority.For more than 18M and more than, even need cross over about 30M structure, except arranging interim pile pier to reduce it except footpath, other are all without good solution.The particularly solution to amount of deflection technical specification, namely amount of deflection is difficult to control to less than L/400.
Summary of the invention
It is an object of the invention to according to above-mentioned the deficiencies in the prior art part, a kind of Long span support amount of deflection is provided to control construction method, concrete beam is carried out segmentation and builds by this amount of deflection control construction method, the end bay concrete beam body built in advance applies interim external beam body prestressing force, to reduce the centering load effect across concrete beam body underlying holder platform, thus to greatest extent with the mechanical characteristic of foot support platform.
The object of the invention realizes being completed by techniques below scheme:
A kind of Long span support amount of deflection controls construction method, relates to the concrete beam more than 18m across footpath, it is characterised in that described amount of deflection controls construction method and comprises the steps: according to detail design requirement, applies foundation pile, and sets up rack platform on described foundation pile；Described concrete beam is divided three sections to build by described rack platform, first two end bay concrete beam body are built, and the interim external beam body prestressing force of two end bay concrete beam body described in stretch-draw, i.e. every temporary pre-stressed concentration in described two end bay concrete beam body carries out two ends stretch-draw by the stretching force of 15～18T；After-pouring in across concrete beam body, and the prestressing force of the whole described concrete beam of stretch-draw；Release the interim external beam body prestressing force applied in described two end bay concrete beam body.
Described end bay concrete beam body with described in across the length ratio of concrete beam body be 1.45～1.60:1.
At least 20 described temporary pre-stressed concentration set up by described end bay concrete beam body top board, in described end bay concrete beam body base plate, sets up at least 8 described temporary pre-stressed concentration.
It is an advantage of the invention that (1) compares traditional support construction process, it is possible to solve cannot implement the construction of relatively Long span due to the amount of deflection index of supporting structure；(2) comparing disposable one-piece casting, the beam body built stage by stage is due to the minimizing of concrete quantity, and the construction quality of concrete is more easy to control.
Accompanying drawing explanation
Fig. 1 is that in the present invention, Long span support amount of deflection controls construction method schematic diagram；
Fig. 2 increases temporary pre-stressed concentration sectional schematic diagram newly in end bay in the present invention.
Detailed description of the invention
Inventive feature and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, in order to the understanding of technical staff of the same trade:
In Fig. 1-2, figure labelling 1-5 be respectively as follows: end bay concrete beam body 1, temporary pre-stressed concentration 2, in across concrete beam body 3, foundation pile 4, rack platform 5.
nullEmbodiment: when using Bailey beam support to make large-span concrete support in bridge construction，Suffer from the restriction of its amount of deflection，Can not use in slightly Long span，Thus，The present embodiment will specifically disclose the construction method that a kind of Long span support amount of deflection controls，Suitable in single-box multi-cell、The concrete box beam of many casees multicell，This amount of deflection control method is by improving the thinking of traditional one-piece casting concrete beam，Three sections (i.e. two end bay beam section and middle bridge sections) are become to be carried out the classifying rationally of building of concrete beam，Then in the end bay concrete beam body implemented in advance, interim external beam body prestressing force is applied，To reduce the load effect to span centre，Utilize self of two end bay concrete beam body to undertake the amount of deflection of span centre rack platform，Thus to greatest extent with the mechanical characteristic of foot beret truss beam，Reduce mid-span deflection，Reach structural safety requirement，Specifically include following steps:
(1) as shown in Figure 1, 2, according to former detail design requirement, injection foundation pile 4, and setting up on foundation pile 4 and apply rack platform 5, this rack platform 5 is specifically made up of beret truss beam；
(2) build the structure of two end bay concrete beam body 1 in advance, and extend gently towards span centre；
(3) setting up some temporary pre-stressed concentration 2 in the box beam in end bay concrete beam body 1, the layout rule of the corresponding temporary pre-stressed concentration 2 increased is: 20, top board, base plate 8；The interim external beam body prestressing force of the two end bay concrete beam body 1 that stretch-draw is built, i.e. every temporary pre-stressed concentration 2 carries out two ends stretch-draw according to the stretching force of 15～18T, so that rack platform 5 can be resisted overcomes moment of flexure produced by engineering body and concrete external load；
(4) across concrete beam body 3 in after-pouring span centre position；
(5) stretch-draw by two end bay concrete beam body 1 and in the prestressing force of whole concrete beam that forms across concrete beam body 3；
(6) releasing the interim external beam body prestressing force of two end bay concrete beam body 1, thus forming the engineering body construction meeting designing requirement, reaching structural safety requirement.
In the present embodiment, by concrete beam effect load on rack platform 5, by original whole across be divided into three across, wherein, the segmental length respectively 12m of the end bay concrete beam body 1 on both sides, in across the segmental length of concrete beam body 3 be 8m, thus effectively reducing the amount of deflection size of span centre position；For rack platform 5, namely form three stride continuous structure, although when continuous structure, the moment of flexure of the rack platform in being located across is due to the load action of the end bay concrete beam body 1 on both sides, it is slightly favourable relatively, but caused by the characteristic of beret truss beam, its amount of deflection is difficult to by calculating；Under ensureing the premise that the rack platform 5 calculating except amount of deflection can be transferred through, by two end bay concrete beam body 1 are applied interim external beam body prestressing force, thus helping to reduce the amount of deflection of the rack platform 5 of span centre position, to reach the purpose calculated by amount of deflection.
Claims (3)
1. Long span support amount of deflection controls a construction method, relates to the concrete beam more than 18m across footpath, it is characterised in that described amount of deflection controls construction method and comprises the steps: according to detail design requirement, applies foundation pile, and sets up rack platform on described foundation pile；Described concrete beam is divided three sections to build by described rack platform, first two end bay concrete beam body are built, and the interim external beam body prestressing force of two end bay concrete beam body described in stretch-draw, i.e. every temporary pre-stressed concentration in described two end bay concrete beam body carries out two ends stretch-draw by the stretching force of 15～18T；After-pouring in across concrete beam body, and the prestressing force of the whole described concrete beam of stretch-draw；Release the interim external beam body prestressing force applied in described two end bay concrete beam body.
2. a kind of Long span support amount of deflection according to claim 1 controls construction method, it is characterised in that described end bay concrete beam body with described in across the length ratio of concrete beam body be 1.45～1.60:1.
3. a kind of Long span support amount of deflection according to claim 1 controls construction method, it is characterized in that setting up at least 20 described temporary pre-stressed concentration in described end bay concrete beam body top board, in described end bay concrete beam body base plate, set up at least 8 described temporary pre-stressed concentration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610213775.6A CN105780662B (en) | 2016-04-08 | 2016-04-08 | A kind of Long span support amount of deflection controls construction method |
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| CN201610213775.6A CN105780662B (en) | 2016-04-08 | 2016-04-08 | A kind of Long span support amount of deflection controls construction method |
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| CN105780662A true CN105780662A (en) | 2016-07-20 |
| CN105780662B CN105780662B (en) | 2017-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233831A (en) * | 2022-08-19 | 2022-10-25 | 湖南建工集团有限公司 | Multi-point large-span space steel structure integral continuous lifting method with freely controlled deflection |
Citations (5)
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| KR20090030908A (en) * | 2007-09-21 | 2009-03-25 | 주식회사 동성엔지니어링 | Support structure using diaphragm introduced prestress and steel bridge having it |
| CN101613996A (en) * | 2008-06-24 | 2009-12-30 | 龙建路桥股份有限公司 | Sliding type lower cable-stayed cradle construction method |
| CN102121234A (en) * | 2011-04-23 | 2011-07-13 | 中铁三局集团有限公司 | Quick construction method of two-tower five-span steel truss girder cable-stayed bridge |
| CN102704400A (en) * | 2012-05-28 | 2012-10-03 | 宁波二十冶建设有限公司 | Tensioning method for prestressed concrete |
| CN104264592A (en) * | 2014-10-14 | 2015-01-07 | 中国水利水电第四工程局有限公司 | Construction method of continuous beam |
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2016
- 2016-04-08 CN CN201610213775.6A patent/CN105780662B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090030908A (en) * | 2007-09-21 | 2009-03-25 | 주식회사 동성엔지니어링 | Support structure using diaphragm introduced prestress and steel bridge having it |
| CN101613996A (en) * | 2008-06-24 | 2009-12-30 | 龙建路桥股份有限公司 | Sliding type lower cable-stayed cradle construction method |
| CN102121234A (en) * | 2011-04-23 | 2011-07-13 | 中铁三局集团有限公司 | Quick construction method of two-tower five-span steel truss girder cable-stayed bridge |
| CN102704400A (en) * | 2012-05-28 | 2012-10-03 | 宁波二十冶建设有限公司 | Tensioning method for prestressed concrete |
| CN104264592A (en) * | 2014-10-14 | 2015-01-07 | 中国水利水电第四工程局有限公司 | Construction method of continuous beam |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233831A (en) * | 2022-08-19 | 2022-10-25 | 湖南建工集团有限公司 | Multi-point large-span space steel structure integral continuous lifting method with freely controlled deflection |
| CN115233831B (en) * | 2022-08-19 | 2023-09-15 | 湖南建工集团有限公司 | Integral continuous lifting method for multi-point large-span space steel structure with freely controlled deflection |
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| CN105780662B (en) | 2017-09-08 |
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