CN105780662B - A kind of Long span support amount of deflection controls construction method - Google Patents
A kind of Long span support amount of deflection controls construction method Download PDFInfo
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- CN105780662B CN105780662B CN201610213775.6A CN201610213775A CN105780662B CN 105780662 B CN105780662 B CN 105780662B CN 201610213775 A CN201610213775 A CN 201610213775A CN 105780662 B CN105780662 B CN 105780662B
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- concrete beam
- beam body
- concrete
- end bay
- tensioning
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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)
- Architecture (AREA)
- 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
Construction method is controlled the invention discloses a kind of Long span support amount of deflection, is comprised the following steps：Required according to detail design, apply foundation pile, and rack platform is set up on the foundation pile；Divide three sections by the concrete beam on the rack platform to pour, two end bay concrete beam bodies are poured first, and the interim external beam body prestressing force of two end bay concrete beam bodies described in tensioning, i.e. every temporary pre-stressed concentration in the two end bays concrete beam body carries out two ends tensioning by 15~18T stretching force；After-pouring in across concrete beam body, and the prestressing force of the whole concrete beam of tensioning；Release the interim external beam body prestressing force applied in the two end bays concrete beam body.It is an advantage of the invention that（1）It compared to traditional support construction process, can solve that due to the amount of deflection index of supporting structure the construction compared with Long span can not be implemented；（2）Compared to disposable one-piece casting, the beam body poured stage by stage is due to the reduction of concrete quantity, and the construction quality to concrete is more easy to control.
Description
Technical field
The invention belongs to technical field of bridge engineering, and in particular to a kind of Long span support amount of deflection controls construction method.
Background technology
It is a kind of method commonly used in bridge construction for pouring concrete beam on support.Have stress clear and definite, square by land
Just, simply, material is the features such as be easy to get.But for being limited across river and by navigation waterborne, building limit height etc., it is necessary to which finding can be with
There is the method for relatively large across footpath, i.e. amount of deflection control is necessarily less than L/400.Wherein, the simple rack of beret truss formation is first
One of method of choosing.
But, the across footpath scope that conventional individual layer beret truss is applicable, typically less than 18M is in the majority.For more than 18M and
More than, or even 30M or so structure need to be crossed over, except the interim pile pier of setting is come in addition to reducing its across footpath, other do without good solution
Method.Particularly the solution of amount of deflection technical indicator, i.e. amount of deflection are difficult to control to less than L/400.
The content of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of control of Long span support amount of deflection is applied
Work method, the amount of deflection controls construction method to pour the progress segmentation of concrete beam, applies interim in the end bay concrete beam body poured in advance
External beam body prestressing force, to reduce the load effect of across the concrete beam body underlying holder platform of centering, so as to use foot support to greatest extent
The mechanical characteristic of platform.
The object of the invention is realized and completed by following technical scheme：
A kind of Long span support amount of deflection controls construction method, is related to the concrete beam that across footpath is more than 18m, it is characterised in that described to scratch
Degree control construction method comprises the following steps：Required according to detail design, apply foundation pile, and set up on the foundation pile branch
Body panel；Divide three sections by the concrete beam on the rack platform to pour, two end bay concrete beam bodies are poured first, and two described in tensioning
The interim external beam body prestressing force of end bay concrete beam body, i.e. every temporary pre-stressed concentration in the two end bays concrete beam body by 15~
18T stretching force carries out two ends tensioning；After-pouring in across concrete beam body, and the prestressing force of the whole concrete beam of tensioning；Release institute
State the interim external beam body prestressing force applied in two end bay concrete beam bodies.
The end bay concrete beam body with it is described in across concrete beam body length ratio be 1.45~1.60:1.
At least 20 temporary pre-stressed concentrations are set up in the end bay concrete beam body top plate, at the end bay concrete beam body bottom
At least 8 temporary pre-stressed concentrations are set up in plate.
It is an advantage of the invention that（1）Compared to traditional support construction process, it can solve because the amount of deflection of supporting structure refers to
Mark and the construction compared with Long span can not be implemented；（2）Compared to disposable one-piece casting, the beam body poured stage by stage is due to concrete quantity
Reduce, the construction quality to concrete is more easy to control.
Brief description of the drawings
Fig. 1 is Long span support amount of deflection control construction method schematic diagram in the present invention；
Fig. 2 is newly-increased temporary pre-stressed concentration sectional schematic diagram in end bay in the present invention.
Embodiment
The feature and other correlated characteristics of the present invention are described in further detail by embodiment below in conjunction with accompanying drawing, with
It is easy to the understanding of technical staff of the same trade：
Mark 1-5 is respectively in such as Fig. 1-2, figure：End bay concrete beam body 1, temporary pre-stressed concentration 2, in across concrete beam body 3, basis
Stake 4, rack platform 5.
Embodiment：When making large-span concrete support using Bailey beam support in bridge construction, its amount of deflection is suffered from
Limitation, it is impossible to used in slightly larger across footpath, thus, the present embodiment will specifically disclose a kind of applying for Long span support amount of deflection control
Work method, it is adaptable to single-box multi-cell, the concrete box beam of many case multicells, the amount of deflection control method one-piece casting concrete traditional by improving
The thinking of beam, classifying rationally is poured into three sections by concrete beam（I.e. two end bay beam sections and a middle bridge section）Implemented,
Then interim external beam body prestressing force, to reduce the load effect to span centre, profit are applied in the end bay concrete beam body implemented in advance
The amount of deflection of span centre rack platform is undertaken with itself of two end bay concrete beam bodies, so as to greatest extent with the power of sufficient beret truss beam
Characteristic is learned, reduces mid-span deflection, reaches structure safety requirements, specifically include following steps：
（1）As shown in Figure 1, 2, required according to former detail design, injection foundation pile 4, and set up on foundation pile 4 and apply branch
Body panel 5, the rack platform 5 is specifically what is be made up of beret truss beam；
（2）The structure of two end bay concrete beam bodies 1 is poured in advance, and is extended gently towards span centre；
（3）Some temporary pre-stressed concentrations 2 are set up in box beam in end bay concrete beam body 1, corresponding increased interim prestressing force
The arrangement rule of beam 2 is：20, top plate, bottom plate 8；The interim external beam body for the two end bay concrete beam bodies 1 that tensioning has been poured is pre-
Stress, i.e. every temporary pre-stressed concentration 2 carries out two ends tensioning according to 15~18T stretching force, so that rack platform 5 can
Resistance overcomes moment of flexure of the engineering body i.e. produced by concrete external load；
（4）After-pouring span centre position in across concrete beam body 3；
（5）Tensioning by two end bay concrete beam bodies 1 and in the prestressing force of whole concrete beam that is constituted of across concrete beam body 3；
（6）The interim external beam body prestressing force of two end bay concrete beam bodies 1 is released, so as to form the engineering sheet for meeting design requirement
Body structure, reaches structure safety requirements.
In the present embodiment, the load by concrete beam effect on rack platform 5, by it is original it is whole across be divided into three across, wherein,
The segmental length of the end bay concrete beam body 1 on both sides is respectively 12m, in across concrete beam body 3 segmental length be 8m so that effectively reduce across
Amount of deflection size at middle position；For rack platform 5, that is, form three stride continuous structure, although under conditions of continuous structure,
Positioned at span centre rack platform moment of flexure due to the load action of the end bay concrete beam body 1 on both sides, relative is slightly favourable, but by
Caused by the characteristic of beret truss beam, its amount of deflection is difficult to by calculating；Ensureing calculating of the rack platform 5 in addition to amount of deflection all
Can be on the premise of, by the way that two end bay concrete beam bodies 1 are applied with interim external beam body prestressing force, so as to help to reduce span centre position
The amount of deflection of the rack platform 5 at place, to reach the purpose calculated by amount of deflection.
Claims (2)
1. a kind of Long span support amount of deflection controls construction method, it is related to the concrete beam that across footpath is more than 18m, it is characterised in that the amount of deflection
Control construction method comprises the following steps：Required according to detail design, apply foundation pile, and support is set up on the foundation pile
Platform；Divide three sections by the concrete beam on the rack platform to pour, two end bay concrete beam bodies, and two side described in tensioning are poured first
Across the interim external beam body prestressing force of concrete beam body, i.e. every temporary pre-stressed concentration in the two end bays concrete beam body presses 15~18T
Stretching force carry out two ends tensioning；After-pouring in across concrete beam body, and the prestressing force of the whole concrete beam of tensioning；Release described two
The interim external beam body prestressing force applied in end bay concrete beam body；The end bay concrete beam body with it is described in across concrete beam body length ratio
For 1.45~1.60:1.
2. a kind of Long span support amount of deflection control construction method according to claim 1, it is characterised in that in the end bay
At least 20 temporary pre-stressed concentrations are set up in concrete beam body top plate, at least 8 institutes are set up in the end bay concrete beam body bottom plate
State temporary pre-stressed concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610213775.6A CN105780662B (en) | 2016-04-08 | 2016-04-08 | A kind of Long span support amount of deflection controls construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN105780662A CN105780662A (en) | 2016-07-20 |
| CN105780662B true CN105780662B (en) | 2017-09-08 |
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| CN201610213775.6A Active CN105780662B (en) | 2016-04-08 | 2016-04-08 | A kind of Long span support amount of deflection controls construction method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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 |
-
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 |
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| CN105780662A (en) | 2016-07-20 |
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