CN101289834A - Construction method of wide span post tensioning type cast-in-situ box girder panel - Google Patents
Construction method of wide span post tensioning type cast-in-situ box girder panel Download PDFInfo
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- CN101289834A CN101289834A CNA2008100243686A CN200810024368A CN101289834A CN 101289834 A CN101289834 A CN 101289834A CN A2008100243686 A CNA2008100243686 A CN A2008100243686A CN 200810024368 A CN200810024368 A CN 200810024368A CN 101289834 A CN101289834 A CN 101289834A
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- crack
- box girder
- situ box
- cast
- post tensioning
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Abstract
The invention provides a construction method for large-span post-tensioning method cast-in-situ box girder panels, relating to a construction process, The construction method comprises the following steps of pretreating roadbed surfaces, building brackets, casting, dismounting templates and treating the surfaces. The construction method has the advantages of reasonable construction process and easy operation, which can effectively prevent cracks from occurring on the surfaces of roads or bridges and greatly improve engineering quality.
Description
Technical field
The present invention relates to a kind of construction process, specifically relate to a kind of job practices of wide span post tensioning type cast-in-situ box girder panel of building.
Background technology
Elevated road or bridge engineering dominate day by day in urban construction plays a significantly greater role for alleviating crowded urban traffic, but exist hidden danger owing to multiple reason makes engineering in construction works, even easily causes the accident.
Elevated road or bridge for large span (general total length is greater than 3500M), main line case beam generally adopts equal altitudes post stressed concrete continuous beam, circular arc type thin-walled single-box multi-cell section, standard is striden the construction employing and is once fallen to putting up type, and the road slab prestressed strand adopts the flat anchor anchoring of high strength low relaxed steel strand.Such engineering is after the second time, concrete pouring finished, join the crossbeam both sides in every company and the direction across bridge crack that length scale differs occurred, cause workmanship to descend, cause that the bridge deck concrete reasons of cracks mainly contains: the one, header portion is that a concrete solid structure and member section are excessive, around it is case chamber hollow-core construction, in course of hardening, and the difference of amount of contraction, produce horizontal tensile stress, easily formed condensing crack; The 2nd, the prestressed structure span is bigger, and the beam member cross section is also big, and working load is also big, easily causes the sedimentation at crossbeam position asynchronous with the place's sedimentation of corresponding panel, has produced the crack; The 3rd, in touch and remove too early, and in the engineering of stripping, materials such as template steel pipe are all piled up on bridge floor, too early stressed of structure produces the crack.
Summary of the invention
The object of the invention is to invent a kind of job practices that can overcome road or generation crack, bridge surface, improve the wide span post tensioning type cast-in-situ box girder panel of workmanship.
The present invention includes following steps:
1) road bed preliminary treatment: the roadbed soil particle is handled, mixed two ashes or cement stabilized macadam, carry out layered rolling earlier, carry out hardening of concrete again and handle, adopt the concrete that is not less than C30 to lay, the roadbed laying depth is 15～20cm;
2) proping: set up at support and the integral body of support to be reinforced after finishing, secondly encrypt support, adopt the symmetrical stretch-draw of two controls at header portion;
3) cast: one-time-concreting concrete 1200m
3± 50m
3, build 15～20 hours time, in cast, adopt the water road pavement to carry out maintenance, engineering build finish after, in time cover geotextiles, and water seasoning 7～10 days;
4) stripping;
5) surfacing: remove the trash and the dust on surface,, adopt the epoxy resin pressure grouting place, a small amount of crack occurring, treat epoxy cure after, the wandering resin in cleaning surface.
For further ensureing construction quality, step 2 of the present invention) in, tension sequence is 0-10%-20%-100%, each root symmetry stretch-draw is from the centre to both sides.
In addition, before form removable, carry out test block test, treat concrete strength reach designing requirement 90% after remove.
Simultaneously, in the step 5) of the present invention during the epoxy resin pressure grouting, earlier with adhesive tape with on the Crack Sealing, selecting broad place, crack or crack infall is grouting port, distance is 25～35cm between the grouting port on the same crack, carries out slip casing by pressure with syringe.
Construction technology of the present invention is reasonable, and easy operating can effectively overcome road or bridge surface and produce the crack, increases substantially workmanship.
The specific embodiment:
Below enumerate a kind of concrete constructing operation process:
(1) road bed preliminary treatment: at first the roadbed soil particle is handled, mixed other materials such as two ashes or cement stabilized macadam, and layered rolling, carry out hardening of concrete again and handle, adopt the concrete that is not less than C30 to lay, laying depth is generally 15-20cm.
(2) proping: set up at support and the integral body of support to be reinforced after finishing, secondly encrypt support, adopt the symmetrical stretch-draw of two controls at header portion, avoid the steel strand torsional deformation as far as possible, tension sequence is 0-10%-20%-100%, and each root symmetry stretch-draw is from the centre to both sides.
(3) cast: the about 1200m of one-time-concreting concrete
3, the time of building reaches 15-20 hour, adopts tap water or well water road pavement to carry out maintenance in cast, engineering build finish after, in time cover geotextiles, and water seasoning 7-10 days.
(4) stripping: before form removable, should carry out test block test, treat concrete strength reach designing requirement 90% the time remove.
(5) surfacing: remove the trash on surface and dust etc.,, adopt the epoxy resin pressure grouting place, a small amount of crack occurring, treat epoxy cure after, the wandering resin in cleaning surface gets final product.
Wherein, the job practices of epoxy resin pressure grouting is: with adhesive tape with on the Crack Sealing, selecting broad place, crack or crack infall is grouting port, distance is 25-35cm between the grouting port on the same crack, carry out slip casing by pressure with syringe, behind the epoxy cure to be injected, the adhesive tape and the stream on cleaning surface spread resin.
Claims (4)
1, the job practices of wide span post tensioning type cast-in-situ box girder panel is characterized in that may further comprise the steps:
1) road bed preliminary treatment: the roadbed soil particle is handled, mixed two ashes or cement stabilized macadam, carry out layered rolling earlier, carry out hardening of concrete again and handle, adopt the concrete that is not less than C30 to lay, the roadbed laying depth is 15～20cm;
2) proping: set up at support and the integral body of support to be reinforced after finishing, secondly encrypt support, adopt the symmetrical stretch-draw of two controls at header portion;
3) cast: one-time-concreting concrete 1200m3 ± 50m3, build 15～20 hours time, in cast, adopt the water road pavement to carry out maintenance, engineering build finish after, in time cover geotextiles, and water seasoning 7～10 days;
4) stripping;
5) surfacing: remove the trash and the dust on surface,, adopt the epoxy resin pressure grouting place, a small amount of crack occurring, treat epoxy cure after, the wandering resin in cleaning surface.
2, according to the job practices of the described wide span post tensioning type cast-in-situ box girder panel of claim 1, it is characterized in that step 2) in, tension sequence is 0-10%-20%-100%, each root symmetry stretch-draw is from the centre to both sides.
3, according to the job practices of the described wide span post tensioning type cast-in-situ box girder panel of claim 1, it is characterized in that before form removable, carrying out test block test, treat concrete strength reach designing requirement 90% after remove.
4, according to the job practices of the described wide span post tensioning type cast-in-situ box girder panel of claim 1, when it is characterized in that in the described step 5) epoxy resin pressure grouting, earlier with adhesive tape with on the Crack Sealing, selecting broad place, crack or crack infall is grouting port, distance is 25～35cm between the grouting port on the same crack, carries out slip casing by pressure with syringe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100243686A CN101289834A (en) | 2008-06-06 | 2008-06-06 | Construction method of wide span post tensioning type cast-in-situ box girder panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100243686A CN101289834A (en) | 2008-06-06 | 2008-06-06 | Construction method of wide span post tensioning type cast-in-situ box girder panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101289834A true CN101289834A (en) | 2008-10-22 |
Family
ID=40034266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100243686A Pending CN101289834A (en) | 2008-06-06 | 2008-06-06 | Construction method of wide span post tensioning type cast-in-situ box girder panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101289834A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413251B (en) * | 2008-11-21 | 2011-12-28 | 中国葛洲坝集团股份有限公司 | 0 type block anti-cracking construction method of high pier large across creeping formwork |
| CN106592437A (en) * | 2016-12-16 | 2017-04-26 | 曹晓滨 | Cast-in-situ construction method for cast-in-situ concrete bridge |
-
2008
- 2008-06-06 CN CNA2008100243686A patent/CN101289834A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413251B (en) * | 2008-11-21 | 2011-12-28 | 中国葛洲坝集团股份有限公司 | 0 type block anti-cracking construction method of high pier large across creeping formwork |
| CN106592437A (en) * | 2016-12-16 | 2017-04-26 | 曹晓滨 | Cast-in-situ construction method for cast-in-situ concrete bridge |
| CN106592437B (en) * | 2016-12-16 | 2018-02-16 | 曹晓滨 | A kind of cast-in-situ construction method of cast-in-place concrete bridge |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081022 |