CN101994291A - Process for applying prestress on steel-concrete combined continuous beam - Google Patents
Process for applying prestress on steel-concrete combined continuous beam Download PDFInfo
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- CN101994291A CN101994291A CN200910184147XA CN200910184147A CN101994291A CN 101994291 A CN101994291 A CN 101994291A CN 200910184147X A CN200910184147X A CN 200910184147XA CN 200910184147 A CN200910184147 A CN 200910184147A CN 101994291 A CN101994291 A CN 101994291A
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Abstract
The invention relates to a process for applying prestress on a steel-concrete combined continuous beam. The method comprises the following steps of: prebending a steel beam (1) through preheating in a bending direction opposite to the practical stress direction of a bridge; arranging a sand barrel (6) on an inner supporting seat (5) to increase the construction height of the inner supporting seat (5); arranging a rear casting zone (7) on the inner supporting seat (5), wherein the casting time of concrete (9) of the rear casting zone (7) is later than the casting time of the firstly-cast concrete by a solidification period; dismounting the sand barrel (6) on the inner supporting seat (5) after all concrete reaches the strength requirement; arranging an external prestress cable on the steel beam and stretching the external prestress with a stretching device to finish the application of the prestress on the whole beam. The invention effectively prevents concrete in an inner bracket region and a stretching arching region from cracking, saves a great amount of raw materials, decreases the cost, shortens the construction period and has remarkable economic benefits.
Description
Technical field
The invention belongs to and stride girder construction field, footpath in bridge and the Structural Engineering greatly, mainly in steel-concrete combination continuous beam site operation, use.
Background technology
In recent years, steel-concrete combination continuous beam obtains more and more widely application in China, and bearing further strengthened the span of compound beam to the unloading effect of simply supported beam in it can make full use of, and reduced deck-molding.But, steel-concrete combination continuous beam under the load action produces hogging moment in interior standoff region, the concrete of standoff region was in tension state in hogging moment made, in order to solve tension crack on concrete problem, existing steel-concrete combination continuous beam applies prestressed process and is: the bellows reserving hole channel is set in concrete slab, in the duct, wear high tensile reinforcement or steel strand, high tensile reinforcement or steel strand are fixed on the stretch-draw anchor at bridge two ends, the stretch-draw anchor end bears and all applies prestressed pulling force, and the stretch-draw anchor end is easy to produce the crack.This method for applying prestressing force also has following not enough:
(1) desire in concrete slab, to apply prestressing force, must be at the inner bellows of placing of concrete slab, this just need add thick concrete slab, increases construction weight.
(2) the stretch-draw anchor end complex structure of this method for applying prestressing force, additional bar technology intractable under the anchor.
(3) by prestressing with bond method control concrete slab hogging moment area crack width, still have certain crack and occur, influence durability of structures.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of steel-concrete combination continuous beam method for applying prestressing force.The present invention finishes the work like this:
Steel-concrete combination continuous beam method for applying prestressing force of the present invention is as follows:
1) when the factory process girder steel, at first girder steel is heated, girder steel after the heating is applied external force, under external force, make the girder steel bending direction with actual use be subjected to force direction opposite, girder steel is made of top board, base plate and web, and the girder steel degree of crook is directly proportional with the span of steel-concrete combination continuous beam;
2) set up bent girder steel in, Sand Bucket is placed at interior bearing bridge pier top, height of support in increasing;
3) ater-casting is set having set up on the top board of girder steel, bearing top in the ater-casting is located at, its length is about each 1/5 span of interior bearing both sides span.At first pour into a mould the concrete outside the ater-casting, treat that first pouring concrete reaches design strength after, pour into a mould the ater-casting concrete again;
4) treat that the ater-casting concrete reaches design strength after, the Sand Bucket in shedding on the bearing is finished applying ater-casting concrete slab compressive pre-stress;
5) after Sand Bucket on the bearing sheds in treating, on the girder steel of the steel-concrete combination continuous beam that sets up, arrange external prestressing tendon, external prestressing tendon adopts broken line shape, prestressed material adopts steel strand or steel wire, carry out the stretch-draw of external prestressing tendon with stretching device, the external prestressing of finishing whole beam applies.
The present invention compared with prior art has following advantage:
The present invention by the prebuckling girder steel, be provided with ater-casting, Sand Bucket increase in the comprehensive use of height of support and external prestressing technology, effectively set up the prestressing force of standoff region concrete roof in the steel-concrete combination continuous beam, avoid in concrete slab, being provided with a large amount of prestressed pore passages, thereby can effectively alleviate dead load, avoid the cracking of concrete slab; Adopt the external prestressing tendon that directly is anchored in girder steel on a small quantity, reduced the complexity of anchoring structure, avoided the appearance of anchorage zone cracking phenomena; Prestressing force of the present invention applies more effective reliable, has given full play to the advantage of different materials, has saved material usage, has tangible technical advantage and economic benefit.
Description of drawings
Accompanying drawing 1 is a steel-concrete combination beam structure sketch of the present invention.
Accompanying drawing 2 is the sectional drawings at bearing place in the steel-concrete combination continuous beam of the present invention.
Now be described with reference to the accompanying drawings the invention process technology:
1) when factory process girder steel (1), at first girder steel (1) is heated, under external force, make girder steel (1) bending direction and the actual stressed opposite direction that uses, girder steel (1) is made of top board (2), base plate (3) and web (4), and girder steel (1) degree of crook is directly proportional with the span of steel-concrete combination continuous beam;
2) set up bent girder steel (1) in, Sand Bucket (6) is placed at interior bearing (5) bridge pier top, bearing (5) highly in increasing;
3) at the top board that has set up girder steel (1) (2) post-cast strip (7) is set, post-cast strip (7) are located at interior bearing (5) top, and its length is about each 1/5 span of interior bearing (5) both sides span. At first pour into a mould the concrete (8) outside the post-cast strip (7), treat that first pouring concrete (8) reaches design strength after, pour into a mould again post-cast strip concrete (9);
4) treat that post-cast strip concrete (9) reaches design strength after, shed the Sand Bucket (6) on the interior bearing (5), finish applying post-cast strip concrete slab (9) compressive pre-stress;
5) treat that Sand Bucket (6) on the interior bearing (5) sheds after, on the girder steel (1) of the steel-concrete combination continuous beam that sets up, arrange external prestressing tendon, the linear employing broken line shape of external prestressing tendon, prestressed material adopts steel strand wires or steel wire, carry out the stretch-draw of external prestressing tendon with stretching device, the external prestressing of finishing whole beam applies.
The specific embodiment
Striding steel-concrete combination continuous beam with three of 3 * 30m is example, and implementation method of the present invention is described:
1) divide 3 sections processing 3 * 30m girder steels when (1) in factory, at first to 3 sections girder steels (1) heating, under external force, make girder steel (1) middle bent 15cm (stride footpath about 1/200), girder steel (1) bending direction is subjected to force direction opposite with actual use;
2) Sand Bucket (6) is placed at interior bearing (5) bridge pier top, makes interior bearing (5) highly increase 15cm, divides 3 sections setting up the girder steel (1) that bends, and is whole girder steel (1) with 3 sections welderings then;
3) ater-casting (7) is set on the top board that has set up whole girder steel (1) (2), ater-casting (7) are located at interior bearing (5) top, and length is 12m, each 6m about interior bearing (5).At first pour into a mould the concrete (8) outside the ater-casting (7), after 7 days, treat that earlier pouring concrete (8) reaches design strength after, pour into a mould ater-casting (7) concrete (9) again.
4) after ater-casting concrete (9) reaches design strength, shed the Sand Bucket (6) on the interior bearing (7), finish applying ater-casting concrete slab (9) compressive pre-stress;
5) treat that Sand Bucket (6) on the interior bearing (7) sheds after, on the girder steel of the steel-concrete combination continuous beam (1) that sets up, arrange the external prestressing tendon of broken line shape, carry out the stretch-draw of external prestressing tendon with stretching device, the external prestressing of finishing whole beam applies.
Claims (1)
1. a Prestressed Steel and Concrete Composite Beam method for applying prestressing force is characterized in that,
(1) when the factory process girder steel, at first to the girder steel heating, under external force, make the girder steel bending direction with actual use be subjected to force direction opposite, girder steel is made of top board, base plate and web, and the girder steel degree of crook is directly proportional with the span of steel-concrete combination continuous beam
(2) set up bent girder steel in, Sand Bucket is placed at interior bearing bridge pier top, height of support in increasing,
(3) ater-casting is set having set up on the top board of girder steel, bearing top in the ater-casting is located at, its length is about each 1/5 span of interior bearing both sides span, at first pour into a mould the concrete outside the ater-casting, after treating that first pouring concrete reaches design strength, pour into a mould the ater-casting concrete again
(4) treat that the ater-casting concrete reaches design strength after, the Sand Bucket in shedding on the bearing is finished the applying of ater-casting concrete slab compressive pre-stress,
(5) after Sand Bucket on the bearing sheds in treating, on the girder steel of the steel-concrete combination continuous beam that sets up, arrange external prestressing tendon, the linear employing broken line shape of external prestressing tendon, prestressed material adopts steel strand or steel wire, carry out the stretch-draw of external prestressing tendon with stretching device, the external prestressing of finishing whole beam applies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910184147XA CN101994291A (en) | 2009-08-25 | 2009-08-25 | Process for applying prestress on steel-concrete combined continuous beam |
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| CN200910184147XA CN101994291A (en) | 2009-08-25 | 2009-08-25 | Process for applying prestress on steel-concrete combined continuous beam |
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| CN101994291A true CN101994291A (en) | 2011-03-30 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060542A (en) * | 2014-06-30 | 2014-09-24 | 中交二航局第四工程有限公司 | Transverse bridge direction prestress exerting device for combined beam cable-stayed bridge and transverse bridge direction prestress exerting method |
| CN104372959A (en) * | 2014-12-10 | 2015-02-25 | 邢兵 | Structural comprehensive prestress reinforcing method |
| CN105064202A (en) * | 2015-07-17 | 2015-11-18 | 安徽省交通建设有限责任公司 | Profile steel and reinforced concrete slab assembled light composite beam bridge and construction method thereof |
| CN106284046A (en) * | 2016-10-09 | 2017-01-04 | 北京市市政工程设计研究总院有限公司 | Bridge steel concrete equals curved combination beam manufacture method |
| CN107090945A (en) * | 2017-04-28 | 2017-08-25 | 金梁复材（北京）科技有限公司 | A kind of anti-slip I-beam, prestressing force I-beam and prestressing force span bridge |
| CN108457195A (en) * | 2018-03-16 | 2018-08-28 | 广州市市政工程设计研究总院 | A kind of mixed composite beam bridge pre-bending construction method of steel- |
| CN112482193A (en) * | 2020-11-18 | 2021-03-12 | 中铁大桥勘测设计院集团有限公司 | Method for applying compressive stress to concrete slab in hogging moment area of combination beam, main beam and cable-stayed bridge |
| CN113216259A (en) * | 2021-06-08 | 2021-08-06 | 吉林建筑大学 | Method for applying prestress to concrete pipe gallery |
-
2009
- 2009-08-25 CN CN200910184147XA patent/CN101994291A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060542A (en) * | 2014-06-30 | 2014-09-24 | 中交二航局第四工程有限公司 | Transverse bridge direction prestress exerting device for combined beam cable-stayed bridge and transverse bridge direction prestress exerting method |
| CN104060542B (en) * | 2014-06-30 | 2015-11-25 | 中交二航局第四工程有限公司 | Compound beam cable stayed bridge direction across bridge prestress application device and applying method thereof |
| CN104372959A (en) * | 2014-12-10 | 2015-02-25 | 邢兵 | Structural comprehensive prestress reinforcing method |
| CN104372959B (en) * | 2014-12-10 | 2016-07-06 | 邢兵 | A kind of construction pre-stress comprehensive strengthening method |
| CN105064202A (en) * | 2015-07-17 | 2015-11-18 | 安徽省交通建设有限责任公司 | Profile steel and reinforced concrete slab assembled light composite beam bridge and construction method thereof |
| CN106284046A (en) * | 2016-10-09 | 2017-01-04 | 北京市市政工程设计研究总院有限公司 | Bridge steel concrete equals curved combination beam manufacture method |
| CN107090945A (en) * | 2017-04-28 | 2017-08-25 | 金梁复材（北京）科技有限公司 | A kind of anti-slip I-beam, prestressing force I-beam and prestressing force span bridge |
| CN108457195A (en) * | 2018-03-16 | 2018-08-28 | 广州市市政工程设计研究总院 | A kind of mixed composite beam bridge pre-bending construction method of steel- |
| CN112482193A (en) * | 2020-11-18 | 2021-03-12 | 中铁大桥勘测设计院集团有限公司 | Method for applying compressive stress to concrete slab in hogging moment area of combination beam, main beam and cable-stayed bridge |
| CN113216259A (en) * | 2021-06-08 | 2021-08-06 | 吉林建筑大学 | Method for applying prestress to concrete pipe gallery |
| CN113216259B (en) * | 2021-06-08 | 2022-07-22 | 吉林建筑大学 | Method for applying prestress to concrete pipe gallery |
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Application publication date: 20110330 |