CN101469543A - Steel boxed cofferdam construction technique for steel-concrete combined bottom board - Google Patents
Steel boxed cofferdam construction technique for steel-concrete combined bottom board Download PDFInfo
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- CN101469543A CN101469543A CN 200710173657 CN200710173657A CN101469543A CN 101469543 A CN101469543 A CN 101469543A CN 200710173657 CN200710173657 CN 200710173657 CN 200710173657 A CN200710173657 A CN 200710173657A CN 101469543 A CN101469543 A CN 101469543A
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Abstract
The invention relates to a steel-concrete combined type bottom plate bushing box construction process, comprising steps: 1. adopting lateral wall covering bottom board type steel hanging box, laying the bottom board keel above the panel, filling the steel hanging box with concrete; 2. completing splicing of the steel bushing box, welding seam jointing reinforcement on the bottom board, casting down-layer 25cm-thick C40 concrete subsequently; 3. down-lying the steel bushing box in position, synchronously down-lying by a six-group hydraulic jack down-lying device, fine regulating plane position after down-lying to the elevation; 4. welding four steel corbels on each steel casing, positioning the top elevation below the bearing platform bottom elevation; 5. installing an overhanging beam, wherein a Phi 32 finish-rolled spiral steel bar is adopted, the steel bracket is connected to a bottom plate hanging point construction, eliminating the down-lying hanging point, completing force system conversion of the steel hanging box; 6. casting upper layer 75cm thick underwater C30 concrete. The invention is reasonable in construction, capable of reducing steel amount of bottom board; material saving, high in strength, light in weight, fast for construction by applying prestressed material in the steel hanging box.
Description
Technical field
The present invention relates to a kind of bridge and steel bushing case construction technology of being specifically designed to, especially a kind ofly be used for that underwater support table quantity is many, the steel bushing case has enough to meet the need demanding bridge construction, special higher, bottom concrete thickness is less, the steel bushing case construction technology of execution conditions difference for the bridge construction requirement for anticorrosion.
Technical background
The steel bushing case is that the important of on-water bridge bearing platform construction also is the auxiliary construction process of using always.Domestic bridge adopts the pre-manufactured steel casing in a large number, by on-site consolidation, sink in place, operation such as back cover sealing forms the sealing steel work under water, construct for underwater support table.Existing steel bushing case design mainly contains following characteristics:
1), the steel bushing box plate adopts full steel structure, designing and calculating bears bottom concrete by steel sole plate and the pile cap steel reinforced concrete is all conducted oneself with dignity, bottom concrete does not stress substantially.Also have the steel bushing case to consider bottom concrete and foundation pile steel casing bond stress, but stressed indeterminate, bottom concrete has certain thickness, and the back cover pouring quality has considerable influence to bearing capacity under water.
2), the steel bushing case is in place back earlier be suspended on the steel casing with suspension rod temporarily in sinking, adopting steel corbel that the steel bushing case is welded on the steel casing (also has and establish the anti-floating bracket after bottom concrete is built), change load transfer to steel corbel by power system, steel using amount is bigger.
Existing steel bushing case job practices exist steel using amount big, stressed indeterminate, can not give full play to many drawbacks such as bottom concrete effect.Particularly for the access bridge section construction of large bridge, the cushion cap volume is little, quantity is many, and the design of steel bushing case is made every effort to construction and dropped into little, simple to operate.We have invented a kind of steel bushing case construction technology under this background.
Summary of the invention
The objective of the invention is to solve in the bridge water steel bushing case turnover cost height, stressed indefinite technical problem in the bearing platform construction, give full play to the bottom concrete mechanical characteristic, and a kind of steel bushing case construction technology of steel-concrete combined bottom board is provided.
To achieve these goals, the technical scheme that the present invention takes is: a kind of steel-concrete combined bottom board steel bushing case construction technology mainly may further comprise the steps:
1) the steel box adopts sidewall bag base plate form, and base plate primary and secondary keel are placed on the panel top, and inner with the concrete filling, formation steel-concrete combining form base plate strengthens steel box rigidity;
2) assembly unit of steel bushing case is finished, and solder joint reinforcing bar on base plate is with the thick C40 concrete of the 25cm of after-pouring lower floor;
3) the steel bushing caisson sinking is in place, utilizes that sink device sinks synchronously under six groups of hydraulic jack, accurately adjusts the plan-position after sinking to absolute altitude;
4) utilize low tide respectively to weld four steel corbels on each steel casing, a top mark high position stops to corrode passage below absolute altitude at the bottom of the cushion cap;
5) the suspention suspension rod is installed, suspension rod adopts prestressed material Φ 32 fining twisted steels, and steel corbel is connected with base plate suspension centre structure, removes the sinking suspension centre subsequently, finishes the conversion of steel box power system;
6) build the thick C30 under water of upper strata 75cm concrete.
In the above-mentioned first step, the primary and secondary keel only need satisfy bottom concrete and deadweight gets final product;
Begin to build when concrete is chosen in flood slack in above-mentioned the 6th step, build during low tide and finish; If this moment, bottom concrete surfaced, then use manually closely knit and levelling with surperficial concrete vibrating, save bottom concrete and cut work.
Beneficial effect of the present invention is:
1. rational in infrastructure, it is stressed to make full use of the bottom concrete participation, reduces the base plate steel using amount significantly;
2. bottom concrete adopts the secondary casting craft, strengthens the effect that combines with steel sole plate;
3. prestressed material is applied in the steel box, materials province, intensity height, fast from heavy and light, construction.
Description of drawings
Fig. 1 is steel bushing case steel sole plate structural plan figure;
Fig. 2 is steel bushing case steel-concrete binding base plate constructional drawing;
Fig. 3 is steel bushing case prestressing force suspension rod bracket structure figure.
The specific embodiment
Below in conjunction with specific embodiment, further set forth patent of the present invention.Should be understood that these embodiment only to be used to patent of the present invention is described and be not used in the restriction patent of the present invention scope.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read patent instruction of the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment:
62 of the total cushion caps of Shanghai Changjiang Tunnel and Bridge B6 mark, the cushion cap volume is little, quantity is many, and steel-concrete combined bottom board is adopted in the design of steel bushing case, and suspension apparatus adopts prestressed material Φ 32 fining twisted steels.
As shown in Figure 1, the steel box adopts sidewall bag base plate form.To 2[25a, inferior bone 2 is that [12.6, panel 5 is 6mm steel plate (Fig. 2) in length and breadth for steel bushing box plate main joist 1.Primary and secondary keel 1,2 are positioned at the panel top, and fill with concrete inside.Evenly arrange four around each steel casing 3 and hang suspension centre 4 that suspension centre 4 structures need to do to strengthen handling.
As shown in Figure 2, bottom concrete thickness is 100cm.Because it is stressed jointly that bottom concrete participates in steel box base plate, so the back cover quality is crucial.For guaranteeing the bond effect between bottom concrete and the steel box base plate, before sinking was finished in the assembly unit of steel box, the dried in advance thick concrete of one deck 25cm that waters adopted underwater casting 75cm concrete after sinking to putting in place again.Strengthen with the seam reinforcing bar 9 that is welded in advance on the base plate between two layer concretes.
As shown in Figure 3, construction sequence: (a) assembly unit of steel bushing case is finished, and solder joint reinforcing bar 6 (Fig. 2) on base plate is with the thick C40 concrete of the 25cm of after-pouring lower floor; (b) the steel bushing caisson sinking is in place, utilizes that sink device sinks synchronously under six groups of hydraulic jack, accurately adjusts the plan-position after sinking to absolute altitude; (c) utilize low tide respectively to weld four steel corbels 7 on each steel casing 3, a top mark high position stops to corrode passage below absolute altitude at the bottom of the cushion cap; (d) suspention suspension rod 8 is installed, suspension rod 8 adopts prestressed material Φ 32 fining twisted steels, and steel corbel 7 is connected with base plate suspension centre structure, removes the sinking suspension centre subsequently, finishes the conversion of steel box power system.Fining twisted steel bears dead load and load, steel corbel 7 opposing buoyancy; (e) build the thick C30 under water of upper strata 75cm concrete.Begin when concrete is chosen in flood slack to build, build during low tide and finish.This moment, bottom concrete surfaced, then used the manually closely knit and levelling with surperficial concrete vibrating, cut work to save bottom concrete.
Steel bushing case design technology of the present invention should be noted the following aspects in concrete construction:
1) for guaranteeing bottom concrete and steel bushing box plate reliable connection, lower-layer concrete requires vibration compacting, surperficial press polish plucking when building, by the treatment of construction joints technological operation.
2) steel bushing case deadweight, bottom concrete weight, suspended deck structure weight are all born by Φ 32 fining twisted steels, must guarantee in the construction that each suspension rod is stressed evenly, can realize all fining twisted steel prestretchings.
Claims (3)
1. steel-concrete combined bottom board steel bushing case construction technology is characterized in that, may further comprise the steps:
1) the steel box adopts sidewall bag base plate form, and base plate primary and secondary keel (1,2) are placed on the panel top, and inner with the concrete filling, formation steel-concrete combining form base plate strengthens steel box rigidity;
2) assembly unit of steel bushing case is finished, and solder joint reinforcing bar (6) on base plate is with the thick C40 concrete of the 25cm of after-pouring lower floor;
3) the steel bushing caisson sinking is in place, utilizes that sink device sinks synchronously under six groups of hydraulic jack, accurately adjusts the plan-position after sinking to absolute altitude;
4) utilize low tide respectively to weld four steel corbels (7) on each steel casing (3), a top mark high position stops to corrode passage below absolute altitude at the bottom of the cushion cap;
5) suspention suspension rod (8) is installed, suspension rod adopts prestressed material Φ 32 fining twisted steels, and steel corbel (7) is connected with base plate suspension centre (4) structure, removes sinking suspension centre (4) subsequently, finishes the conversion of steel box power system;
6) build the thick C30 under water of upper strata 75cm concrete.
2. steel according to claim 1-concrete combined bottom board steel bushing case construction technology is characterized in that, in the above-mentioned first step, primary and secondary keel (1,2) only need satisfy bottom concrete and deadweight gets final product.
3. steel according to claim 1-concrete combined bottom board steel bushing case construction technology is characterized in that, in above-mentioned the 6th step, begins when concrete is chosen in flood slack to build, and builds during low tide and finishes; If this moment, bottom concrete surfaced, then use manually closely knit and levelling with surperficial concrete vibrating, save bottom concrete and cut work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101736578A CN101469543B (en) | 2007-12-28 | 2007-12-28 | Steel boxed cofferdam construction technique for steel-concrete combined bottom board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101736578A CN101469543B (en) | 2007-12-28 | 2007-12-28 | Steel boxed cofferdam construction technique for steel-concrete combined bottom board |
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| CN101469543A true CN101469543A (en) | 2009-07-01 |
| CN101469543B CN101469543B (en) | 2010-09-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510529A (en) * | 2012-11-22 | 2014-01-15 | 中交第三公路工程局有限公司 | Steel hanging box system for underwater high-rise pile cap construction and construction technology thereof |
| CN105350558A (en) * | 2015-11-13 | 2016-02-24 | 中交天津港湾工程研究院有限公司 | Method for wrapping concrete caisson with abrasion resisting metal materials |
| CN108677680A (en) * | 2018-07-27 | 2018-10-19 | 中国铁建大桥工程局集团有限公司 | A kind of steel reinforced concrete assembled steel hanging box structure |
| CN109594478A (en) * | 2018-12-21 | 2019-04-09 | 中交二航局第二工程有限公司 | Applied to the high-rise pile cap steel lifted trunk bottom sealing method under long-period wave surge condition |
| CN110439013A (en) * | 2019-07-29 | 2019-11-12 | 重庆弘粟建筑科技有限公司 | A kind of main pier bearing platform steel suspended box cofferdam construction method |
| CN111779015A (en) * | 2020-06-27 | 2020-10-16 | 中建五局土木工程有限公司 | Construction method of bottom-sealed concrete of underwater bearing platform steel sleeve box |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186503C (en) * | 2003-06-26 | 2005-01-26 | 中铁大桥局集团有限公司 | Method for positioning whole floatation transported steel caisson by pre-exerting tension at anchor pier and being drilling platform |
| CN1318703C (en) * | 2003-10-31 | 2007-05-30 | 上海建工（集团）总公司 | Cellulated or half cellulated self natant jacket |
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2007
- 2007-12-28 CN CN2007101736578A patent/CN101469543B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510529A (en) * | 2012-11-22 | 2014-01-15 | 中交第三公路工程局有限公司 | Steel hanging box system for underwater high-rise pile cap construction and construction technology thereof |
| CN103510529B (en) * | 2012-11-22 | 2015-06-10 | 中交第三公路工程局有限公司 | Steel hanging box system for underwater high-rise pile cap construction and construction technology thereof |
| CN105350558A (en) * | 2015-11-13 | 2016-02-24 | 中交天津港湾工程研究院有限公司 | Method for wrapping concrete caisson with abrasion resisting metal materials |
| CN106498968A (en) * | 2015-11-13 | 2017-03-15 | 中交天津港湾工程研究院有限公司 | The application of concrete caisson outer cladding corrosion-resistant metallic material structure |
| CN106498968B (en) * | 2015-11-13 | 2019-01-29 | 中交天津港湾工程研究院有限公司 | The application of concrete caisson outer cladding corrosion-resistant metallic material structure |
| CN108677680A (en) * | 2018-07-27 | 2018-10-19 | 中国铁建大桥工程局集团有限公司 | A kind of steel reinforced concrete assembled steel hanging box structure |
| CN109594478A (en) * | 2018-12-21 | 2019-04-09 | 中交二航局第二工程有限公司 | Applied to the high-rise pile cap steel lifted trunk bottom sealing method under long-period wave surge condition |
| CN110439013A (en) * | 2019-07-29 | 2019-11-12 | 重庆弘粟建筑科技有限公司 | A kind of main pier bearing platform steel suspended box cofferdam construction method |
| CN111779015A (en) * | 2020-06-27 | 2020-10-16 | 中建五局土木工程有限公司 | Construction method of bottom-sealed concrete of underwater bearing platform steel sleeve box |
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| Publication number | Publication date |
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| CN101469543B (en) | 2010-09-29 |
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Owner name: SHANGHAI FOUNDATION ENGINEERING GROUP CO., LTD. Free format text: FORMER NAME: SHANGHAI FOUNDATION ENGINEERING CO., LTD. |
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Address after: 200433 Yangpu District, Shanghai Star Road, No. 231 Patentee after: Shanghai Foundation Engineering Group Co., Ltd. Address before: 200433 Yangpu District, Shanghai Star Road, No. 231 Patentee before: Shanghai Foundation Engineering Co., Ltd. |