CN106480827A - A kind of construction technology of segmented casting concrete box beam - Google Patents
A kind of construction technology of segmented casting concrete box beam Download PDFInfo
- Publication number
- CN106480827A CN106480827A CN201610994227.1A CN201610994227A CN106480827A CN 106480827 A CN106480827 A CN 106480827A CN 201610994227 A CN201610994227 A CN 201610994227A CN 106480827 A CN106480827 A CN 106480827A
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- box beam
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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)
Abstract
The invention discloses a kind of construction technology of segmented casting concrete box beam, constructed box beam is made up of multiple box girder segments of first after-pouring, and described box girder segment is armored concrete beam section, and when constructed box beam is constructed, process is as follows：(1) support is installed, and carries out precompressed to described support；(2) installation form；(3) colligation regular reinforcement；(3) scene is segmented pours：Pour first sections concrete, complete the work progress of first section box girder；Then pour later section section box beam concrete, carry out the subsequent construction process of later section section box beam afterwards.Wherein, between the two neighboring box girder segment of first after-pouring, the ratio of reinforcement of the horizontal regular reinforcement of top board is different.The present invention passes through the scheme using adjacent segment top board horizontal ordinary reinforced concrete ratio of reinforcement differentiation, restrained effectively the generation of after-pouring section box beam contraction fissure in segmented casting concrete box beam.
Description
Technical field
The present invention relates to a kind of construction technology of segmented casting concrete box beam.
Background technology
With the fast development of Bridges in Our Country building cause, emerge a collection of across footpath big, various informative, construction complexity
Continuous bridge, has promoted prestressed concrete continuous box girder construction technology constantly to advance, have accumulated rich experience.Continuously
Box beam particularly ultra-wide concrete box girder generally adopts segmented pouring construction process, during segmented pouring construction,
The old and new pour section box girder and shrink inconsistent, often lead to newly to pour box beam section and easily produce cross-direction shrinkage at interface and split
Seam is although these cracks not necessarily affect the safety of works, but it can cause the psychological uneasiness of user.And from
From the point of view of the life-time service of works requires, crack increases the permeability of concrete, and the harmful substance of in the air is easily by splitting
Seam penetrates in concrete, causes regular reinforcement to produce corrosion, the durability of impact works and service life, reduces works
Safety.
Content of the invention
In order to solve problem above, the present invention provides technical scheme below：
A kind of construction technology of segmented casting concrete box beam, constructed box beam is by multiple box girder segments of first after-pouring
Composition, described box girder segment is armored concrete beam section, and when constructed box beam is constructed, process is as follows：(1) support peace
Dress, and precompressed is carried out to described support；(2) installation form；(3) colligation regular reinforcement；(3) scene is segmented pours：Pour head
Sections concrete, completes the work progress of first section box girder；Then pour later section section box beam concrete, carry out later section afterwards
The subsequent construction process of section box beam.
Wherein, between the two neighboring box girder segment of first after-pouring, the ratio of reinforcement of the horizontal regular reinforcement of top board is different.
Further, between described two neighboring box girder segment, the ratio of reinforcement difference 10%- of the horizontal regular reinforcement of top board
15%.
Further, in step (1), before described support is set up, carry out basement process first.
Further, in step (3), after casting concrete, carry out pre- when concrete strength reaches 100% design strength
Stress rib tensioning.
Beneficial effect：The present invention passes through the side using adjacent segment top board horizontal ordinary reinforced concrete ratio of reinforcement difference
Case, restrained effectively the generation of after-pouring section box beam contraction fissure, and construction method has simple structure, with low cost, construction
Convenient feature.
Brief description
The pre-pressing bracket schematic diagram that Fig. 1 provides for the present invention；
The model sheetinstallat schematic diagram that Fig. 2 provides for the present invention；
The Cast-in-Situ Segment regular reinforcement colligation schematic diagram that Fig. 3 provides for the present invention；
Box section schematic diagram after the concreting that Fig. 4 provides for the present invention；
Fig. 5 is the top view of Fig. 4.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited to following examples.
The construction technology of a kind of segmented casting concrete box beam that the present invention provides, constructed box beam is mixed by first after-pouring
Multiple box girder segment compositions of solidifying soil, described box girder segment is armored concrete beam section, when constructed box beam is constructed, mistake
Journey is as follows：
First, basement process
Purpose is to ensure that ground has enough bearing capacities and necessary water-proof drainage facility.Calculate full hall supporter first
The requirement to foundation bearing capacity for the system, is then processed to original ground according to ground actual carrying capacity, for example the reality according to ground
Border situation, can fill out, do the processing methods such as rendzinas, casting concrete basis using changing, and in the ground scope four processing
Dig gutter and cure process week, it is to avoid support produces differential settlement.
2nd, support is installed
Mounting system can be selected according to on-site actual situations, for example, can be common steel tube scaffold, bowl button foot
Hand cradle and assembled door-type scaffold etc..With reference to Fig. 1, in illustrative examples in the present invention, select full hall bowl button
Formula strutting system, is combined installing using bowl fastening type functional steel pipe holder, and wherein, the external diameter of steel pipe is not less than 48mm, wall
Thickness is not less than 3.5mm.
3rd, pre-pressing bracket
The purpose one side of precompressed is by once carrying simulation, the stability in the large that checking bracket is set up and checking support
And the actual bearer ability of bracket basis, overcome the differential settlement of concrete placings process medium-height trestle, it is to avoid box beam concrete is because propping up
Frame differential settlement and crack occurs it is ensured that construction safety, be on the other hand eliminate construction fore-stock and ground non-resilient heavy
Fall deformation, collects support and the elastic deformation of ground and the data of inelastic deformation simultaneously, is that bottom die of box-beam construction elevation controls
With span centre Application in Pre-camber provide accurately according to it is ensured that beam body geometricshape accurate.
Load mode those skilled in the art of support can be selected according to practical situation, for example, can use sand
Bag, earth bag, water tank, or using modes such as water for prepressing, the scope of loading is box beam bottom, and the gross weight of loading is not less than box beam
1.2 times of gross weight.Load assignment position is consistent with the distribution of box beam gravity load, and during loading, each point ballast will symmetrically be prevented
Abnormal conditions only occur.According to the difference of box beam concrete casting process method during practice of construction, the scheme of loading is permissible
It is divided into disposable loading and two kinds of hierarchical loading.Disposable loading is that the disposable cloth of total weight of load is pressed on support,
And carry out settlement observation.Hierarchical loading is the total weight of load to be divided into (what) cloth several times be pressed on support, and from Jia the
One-level load starts persistently to carry out settlement observation.With reference to Fig. 1, in illustrative examples in the present invention, select sand pocket
02 carries out precompressed.The pile of precompressed sand pocket 02 presses the dead load of design beam body and distribution form is stacked, and it is right to adopt during loading
Claim equal-load preloading arrangement, prevent support bias unstability.Loading sequence is carried out by the order of concreting, can adopt hierarchical loading
Scheme, for example can carry out in three times, the total weight of load is divided into three cloth and is pressed on support, and from plus first order lotus
Load starts persistently to carry out settlement observation.
4th, installation form
Template can be selected according to properties such as material, thickness, intensity, as shown in Fig. 2 the installation of template can be according to existing
Technology is carried out, after support 01 precompressed, by girder model sheetinstallat above support 01.
5th, assembling reinforcement
With reference to Fig. 3, after installation form, assembling reinforcement, and simultaneously bury prestress pipe, wherein, adjacent two casees
In girder segment, the ratio of reinforcement of the horizontal regular reinforcement of top board is different, with reference to Fig. 5, the horizontal regular reinforcement of later section section 06 top board 07 with front
The ratio of reinforcement of the horizontal regular reinforcement of one sections 05 top board 04 is different, by encrypting the arrangement of reinforcement of later section section 06 top board regular reinforcement 07
Rate, to suppress the generation of concrete shrinkage crack it is preferable that between two neighboring described box girder segment, the horizontal ordinary steel of top board
The ratio of reinforcement difference 10%-15% of muscle.
5th, casting concrete
The present invention pours using scene is segmented, pours first sections concrete, the box section after concreting first
Schematic diagram is as shown in figure 4, when first sections concrete strength reaches 100% design strength, carry out tension of prestressed tendon, afterwards root
According to operations such as prior art form removal and supports, complete the construction of first section box girder；Then pour later section section box beam coagulation
Soil, according to the construction of a section box girder after the completion of the work progress of first section box girder.
Specific case used herein is set forth to the principle of the present invention and embodiment, the saying of above example
Bright it is only intended to help and understands assembly of the invention and its core concept；Simultaneously for one of ordinary skill in the art, foundation
The thought of the present invention, all will change in specific embodiments and applications, and in sum, this specification content is not
It is interpreted as limitation of the present invention.
Claims (3)
1. a kind of construction technology of segmented casting concrete box beam, constructed box beam is by multiple box girder segment groups of first after-pouring
Become, described box girder segment is armored concrete beam section, and when constructed box beam is constructed, process is as follows：(1) support is installed,
And precompressed is carried out to described support；(2) installation form；(3) colligation regular reinforcement, and bury prestress pipe simultaneously；(3) scene
Segmented pour：Pour first sections concrete, complete the work progress of first section box girder；Then pour later section section box beam coagulation
Soil, carries out the subsequent construction of later section section box beam.
Wherein, between the two neighboring box girder segment of first after-pouring, the ratio of reinforcement of the horizontal regular reinforcement of top board is different.
2. the construction technology of segmented casting concrete box beam as claimed in claim 1, wherein, described two neighboring box beam section
Between section, the ratio of reinforcement difference 10%-15% of the horizontal regular reinforcement of top board.
3. the construction technology of segmented casting concrete box beam as claimed in claim 1, wherein, in step (1), described support
Before setting up, carry out basement process first.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610994227.1A CN106480827A (en) | 2016-11-11 | 2016-11-11 | A kind of construction technology of segmented casting concrete box beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610994227.1A CN106480827A (en) | 2016-11-11 | 2016-11-11 | A kind of construction technology of segmented casting concrete box beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106480827A true CN106480827A (en) | 2017-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610994227.1A Pending CN106480827A (en) | 2016-11-11 | 2016-11-11 | A kind of construction technology of segmented casting concrete box beam |
Country Status (1)
| Country | Link |
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| CN (1) | CN106480827A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252210A (en) * | 2018-04-09 | 2018-07-06 | 长沙理工大学 | Segment cast-in-situ UHPC bridge beam section joint and construction method thereof |
| CN108589531A (en) * | 2017-12-28 | 2018-09-28 | 广东省建筑工程机械施工有限公司 | A kind of overpass wing plate cantilever pouring method |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN109797660A (en) * | 2019-03-21 | 2019-05-24 | 东南大学 | A kind of segment bracket construction method of beam bridge |
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| JP2007016595A (en) * | 2006-10-27 | 2007-01-25 | Jfe Engineering Kk | Joining structure and joining method for joining main beam to reinforced concrete pier |
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| KR100842062B1 (en) * | 2007-11-08 | 2008-06-30 | 우경건설 주식회사 | The steel composite rahmen bridge construction technique for which preflexion steel girder was used |
| CN103485287A (en) * | 2012-06-15 | 2014-01-01 | 北京交通大学 | Prestressed application method in concrete frame box culvert construction |
| CN205369597U (en) * | 2016-02-05 | 2016-07-06 | 中国建筑西南设计研究院有限公司 | Divide local strenghthened type of few arrangement of reinforcement of disconnected formula not link up concrete power consumption partition wall that cracks |
| CN205475881U (en) * | 2016-02-05 | 2016-08-17 | 中国建筑西南设计研究院有限公司 | Local strenghthened type of few arrangement of reinforcement of connection type does not link up concrete power consumption partition wall that cracks |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108589531A (en) * | 2017-12-28 | 2018-09-28 | 广东省建筑工程机械施工有限公司 | A kind of overpass wing plate cantilever pouring method |
| CN108252210A (en) * | 2018-04-09 | 2018-07-06 | 长沙理工大学 | Segment cast-in-situ UHPC bridge beam section joint and construction method thereof |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN109797660A (en) * | 2019-03-21 | 2019-05-24 | 东南大学 | A kind of segment bracket construction method of beam bridge |
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Application publication date: 20170308 |
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