CN103061243B - Prestressed steel tube concrete combination trussed beam and construction method thereof - Google Patents
Prestressed steel tube concrete combination trussed beam and construction method thereof Download PDFInfo
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- CN103061243B CN103061243B CN201310035618.7A CN201310035618A CN103061243B CN 103061243 B CN103061243 B CN 103061243B CN 201310035618 A CN201310035618 A CN 201310035618A CN 103061243 B CN103061243 B CN 103061243B
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- steel pipe
- steel
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- steel tube
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 244
- 239000010959 steel Substances 0.000 title claims abstract description 244
- 239000000203 mixture Substances 0.000 title claims abstract description 27
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 5
- 210000002356 Skeleton Anatomy 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000000875 corresponding Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 210000002435 Tendons Anatomy 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000002421 anti-septic Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Abstract
The invention relates to a prestressed steel tube concrete combination trussed beam which comprises a steel tube trussed beam and a concrete bridge deck slab, wherein the top part of the steel tube trussed beam is connected with the bottom of the concrete bridge deck slab, the steel tube trussed beam consists of two parallel top chord steel tubes, a bottom chord steel tube and a plurality of steel web members which are abutted to the top chord steel tubes and the bottom chord steel tube, concrete is filled in the bottom chord steel tube, and a prestressed tendon used for adding prestress is paved in the bottom chord steel tube. The invention also relates to a construction method of the prestressed steel tube concrete combination trussed beam. With the adoption of the prestressed steel tube concrete combination trussed beam, by adding the prestress on the steel tube concrete bottom chord steel tube, the whole rigidity of the steel tube concrete combination trussed beam is strengthened in the premise of lightening the structure dead load, deformation of the steel tube concrete combination trussed beam under the structure dead load and the vehicle load is reduced, the welding part of the steel web members and the bottom chord steel tube cracks due to overlarge deformation can also be avoided, and the steel tube concrete combination trussed beam can be applied to a bridge structure with a larger span after the prestress is added on the bottom chord steel tube.
Description
Technical field
The present invention relates to a kind of pre-stressed steel pipe concrete combination trusses and construction method thereof, belong to building building technology field.
Background technology
Steel-concrete composite beam bridge guarantees that by connector the integral body of girder steel and concrete slab is jointly stressed, can give full play to the advantage of Steel concrete material, has obtained in recent years fast development.The steel pipe combination trusses being combined to form by steel pipe trusses and concrete slab is a kind of more rational composite beam bridge structure, it takes full advantage of, and the round steel pipe member radius of gyration is large, torsional property good, easy to process and antiseptic property advantages of higher, can under the prerequisite that does not increase cost, by adjusting steel pipe purlin depth of beam, obtain required structure bending rigidity again simultaneously.Steel pipe combination trusses has been widely used in the bridge types such as continuous girder bridge, continuous rigid frame bridge, cable stayed bridge and suspension bridge at present.
Steel pipe combination trusses has relatively distinct issues: main, the crossing node area of arm is its weak link, and structural bearing capacity is often destroyed and controlled by local nodes, causes the expection overall performance of steel pipe combination trusses to give full play to.For this reason, can improve node area local stiffness and intensity by fill concrete in lower edge steel pipe, guarantee that the local failure of node area is no earlier than whole destruction generation, and formed thus another kind of composite beam bridge structure---concrete filled steel tube combination trusses.Yet, although concrete filled steel tube combination trusses can further improve integral rigidity and the bearing capacity of structure, when trusses span is larger, under the acting in conjunction of dead load and vehicular load, trusses, by producing larger distortion, cannot meet the requirement of serviceability limit state.
Summary of the invention
The present invention is directed to the defect that above-mentioned existing concrete filled steel tube combination trusses applies in Loads of Long-span Bridges and make improvements, the technical problem to be solved in the present invention is to provide a kind of be out of shape little pre-stressed steel pipe concrete combination trusses and construction method thereof.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of pre-stressed steel pipe concrete combination trusses, comprise steel pipe trusses and concrete slab, described steel pipe trusses top is connected with concrete slab bottom, described steel pipe trusses is comprised of the symmetrical steel web member that connects wind up steel pipe and lower edge steel pipe of two parallel steel pipes that wind up, lower edge steel pipe and complex root, in described lower edge steel pipe, be filled with concrete, in described lower edge steel pipe, be equipped with and apply prestressed presstressed reinforcing steel.
Further, described lower edge diameter of steel tube D is 2 ~ 3 times of steel web member, and described presstressed reinforcing steel adopts post stretching stretch-draw, and described presstressed reinforcing steel axis is positioned at below, lower edge steel pipe axis and spacing is e, and e value is between D/6 ~ D/3.
Further, the coated steel pipe that winds up of described concrete slab, described in wind up in steel pipe and be filled with concrete.
Further, described steel web member is that empty steel pipe or inside are filled with concrete steel pipe.
Further, described steel web member top is provided with the junction plate that facilitates it to be connected with the steel pipe that winds up.
Further, described lower edge steel pipe is substituted by two parallel and interconnective fine steel tubes, and described steel web member connects wind up steel pipe and the fine steel tube that is positioned at the same side.
Simultaneously, the present invention also provides a kind of construction method of pre-stressed steel pipe concrete combination trusses, carry out according to the following steps: (1) adopts segmentation welding production lower edge steel pipe, first according to the position designing, in lower edge steel pipe, place and fixing presstressed reinforcing steel, then fill concrete in lower edge steel pipe, when concrete strength reaches 75%, then tensioned prestressing bar is to apply prestressing force to lower edge steel pipe; (2) adjust lower edge steel pipe position, cleaning lower edge steel-pipe welding position, is welded in steel web member on lower edge steel pipe; (3) will wind up steel-pipe welding on steel web member, wind up steel pipe and steel web member, lower edge steel pipe form the steel pipe trusses as skeleton; (4) at steel pipe trusses top, set up bridge deck template, concreting forms concrete slab.
Further, in step (1), described presstressed reinforcing steel axis is positioned at below, lower edge steel pipe axis and spacing is e, and e value is between D/6 ~ D/3, and wherein D is lower edge diameter of steel tube.
Further, in step (2), described lower edge diameter of steel tube D is 2 ~ 3 times of steel web member, and described steel web member is empty steel pipe, when shearing is larger in empty steel pipe fill concrete.
Further, in step (2), described lower edge steel pipe is substituted by two parallel and interconnective fine steel tubes, and corresponding steel web member is welded on the fine steel tube with the steel pipe homonymy that winds up.
Further, in step (3), when steel web member caliber is greater than while winding up steel pipe caliber, described steel web member top is provided with the junction plate that facilitates it to be connected with the steel pipe that winds up.
Further, in step (4), the coated steel pipe that winds up of described concrete slab, described in wind up in steel pipe and be filled with concrete.
Compared with prior art, the present invention has following beneficial effect: by concrete filled steel tube lower edge steel pipe is applied to prestressing force, the integral rigidity that improves concrete filled steel tube combination trusses under the prerequisite of dead load can alleviated, reduce the distortion of concrete filled steel tube combination trusses under dead load and vehicular load, simultaneously also can avoid steel web member and lower edge steel-pipe welding place because being out of shape excessive cracking, lower edge steel pipe applies and can make after prestressing force concrete filled steel tube combine in the bridge construction that trusses is applied to large span more.
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Accompanying drawing explanation
Fig. 1 is the direction across bridge profile of the embodiment of the present invention.
Fig. 2 is a kind of sectional view at A-A place in Fig. 1.
Fig. 3 is the another kind of sectional view at A-A place in Fig. 1.
In figure: 1-lower edge steel pipe, 2-steel web member, the 3-steel pipe that winds up, 4-presstressed reinforcing steel, 5-concrete slab, 6-junction plate, 7-concrete.
The specific embodiment
As shown in Fig. 1 ~ 3, a kind of pre-stressed steel pipe concrete combination trusses, comprise steel pipe trusses and concrete slab 5, described steel pipe trusses top is connected with concrete slab 5 bottoms, described steel pipe trusses is comprised of two parallel steel pipes 3 of winding up, lower edge steel pipe 1 and the symmetrical steel web member 2 that connects wind up steel pipe 3 and lower edge steel pipe 1 of complex root, in described lower edge steel pipe 1, be filled with concrete seven, in described lower edge steel pipe 1, be equipped with and apply prestressed presstressed reinforcing steel 4.Wherein, from the direction across bridge profile of Fig. 1, two steel web members 2 on same cross section are symmetrical about lower edge steel pipe 1 axis; From the suitable bridge of Fig. 2 and Fig. 3, to profile, the complex root steel web member 2 making progress along bridge is uniformly distributed in and winds up between steel pipe 3 and lower edge steel pipe 1, for example with W shape or N shape, distribute, and can also be with other formal distributions certainly.
In the present embodiment, described lower edge steel pipe 1 diameter D is 2 ~ 3 times of steel web member 2, and described presstressed reinforcing steel 4 adopts post stretching stretch-draw, and described presstressed reinforcing steel 4 axis are positioned at lower edge steel pipe 1 below, axis and spacing is e, and e value is between D/6 ~ D/3.The coated steel pipe 3 that winds up as stress frame of described concrete slab 5, described in wind up in steel pipe 3 and be filled with concrete seven.Described steel web member 2 is steel pipe, fill concrete 7 within it when shearing is larger; When shearing is little, can be sky steel pipe.When steel web member 2 calibers are greater than while winding up steel pipe 3 caliber, for fear of the welding difficulty of steel pipe 3 with steel web member 2 junctions of winding up, described steel web member 2 tops are provided with the junction plate 6 that facilitates it to be connected with the steel pipe 3 that winds up.
As shown in Figure 1 and 2, a kind of construction method of pre-stressed steel pipe concrete combination trusses, carry out according to the following steps: (1) adopts segmentation welding production lower edge steel pipe 1, first according to the position designing at the interior placement of lower edge steel pipe 1 and fixing presstressed reinforcing steel 4, then at the interior fill concrete 7 of lower edge steel pipe 1, when concrete seven intensity reaches 75%, tensioned prestressing bar 4 is to apply prestressing force to lower edge steel pipe 1 again, avoid later stage stretch-draw steel web member 2 to be produced to the pressure of non-parallel steel pipe, reduce the initial stress of steel web member 2; (2) adjust lower edge steel pipe 1 position, cleaning lower edge steel pipe 1 welding position, is welded in steel web member 2 on lower edge steel pipe 1; (3) steel pipe 3 that will wind up is welded on steel web member 2, the steel pipe trusses that wind up steel pipe 3 and steel web member 2, lower edge steel pipe 1 form as skeleton; (4) at steel pipe trusses top, set up bridge deck template, concreting 7 forms concrete slab 5.
In step (1), described presstressed reinforcing steel 4 axis are positioned at lower edge steel pipe 1 below, axis and spacing is e, and e value is between D/6 ~ D/3, and wherein D is lower edge steel pipe 1 diameter; In step (2), described lower edge steel pipe 1 diameter D is 2 ~ 3 times of steel web member 2, and described steel web member 2 is empty steel pipe, when shearing is larger in empty steel pipe fill concrete 7; In step (3), when steel web member 2 calibers are greater than while winding up steel pipe 3 caliber, for fear of the welding difficulty of steel pipe 3 with steel web member 2 junctions of winding up, described steel web member 2 tops are provided with the junction plate 6 that facilitates it to be connected with the steel pipe 3 that winds up; In step (4), the coated steel pipe 3 that winds up of described concrete slab 5, described in wind up in steel pipe 3 and be filled with concrete seven.
Especially, it should be noted that, in actual application, when bridge floor is wider, a plurality of this pre-stressed steel pipe concrete combination trusses can be installed, now many lower edge steel pipes 1 are linked into an integrated entity, the many steel pipes 3 that wind up also can link into an integrated entity or not link into an integrated entity.Described lower edge steel pipe 1 can be substituted by two parallel and interconnective fine steel tubes, and now 2 connections of steel web member are positioned at wind up steel pipe 3 and the fine steel tube of the same side, during welding, corresponding steel web member 2 is welded on the fine steel tube with steel pipe 3 homonymies that wind up.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. a pre-stressed steel pipe concrete combines trusses, comprise steel pipe trusses and concrete slab, described steel pipe trusses top is connected with concrete slab bottom, it is characterized in that: described steel pipe trusses is comprised of the symmetrical steel web member that connects wind up steel pipe and lower edge steel pipe of two parallel steel pipes that wind up, lower edge steel pipe and complex root, in described lower edge steel pipe, be filled with concrete, in described lower edge steel pipe, be equipped with and apply prestressed presstressed reinforcing steel; Described lower edge diameter of steel tube D is 2 ~ 3 times of steel web member, and described presstressed reinforcing steel adopts post stretching stretch-draw, and described presstressed reinforcing steel axis is positioned at below, lower edge steel pipe axis and spacing is e, and e value is between D/6 ~ D/3; The coated steel pipe that winds up of described concrete slab, described in wind up in steel pipe and be filled with concrete, described steel web member is that empty steel pipe or inside are filled with concrete steel pipe; Described steel web member top is provided with the junction plate that facilitates it to be connected with the steel pipe that winds up.
2. pre-stressed steel pipe concrete combination trusses according to claim 1, is characterized in that: described lower edge steel pipe is substituted by two parallel and interconnective fine steel tubes, and described steel web member connects wind up steel pipe and the fine steel tube that is positioned at the same side.
3. the construction method of pre-stressed steel pipe concrete combination trusses, it is characterized in that, carry out according to the following steps: (1) adopts segmentation welding production lower edge steel pipe, first according to the position designing, in lower edge steel pipe, place and fixing presstressed reinforcing steel, then fill concrete in lower edge steel pipe, when concrete strength reaches 75%, then tensioned prestressing bar is to apply prestressing force to lower edge steel pipe; (2) adjust lower edge steel pipe position, cleaning lower edge steel-pipe welding position, is welded in steel web member on lower edge steel pipe; (3) will wind up steel-pipe welding on steel web member, wind up steel pipe and steel web member, lower edge steel pipe form the steel pipe trusses as skeleton; (4) at steel pipe trusses top, set up bridge deck template, concreting forms concrete slab.
4. pre-stressed steel pipe concrete according to claim 3 combines the construction method of trusses, it is characterized in that: in step (1), described presstressed reinforcing steel axis is positioned at below, lower edge steel pipe axis and spacing is e, and e value is between D/6 ~ D/3, and wherein D is lower edge diameter of steel tube.
5. according to the construction method of the pre-stressed steel pipe concrete combination trusses described in claim 3 or 4, it is characterized in that: in step (2), described lower edge diameter of steel tube D is 2 ~ 3 times of steel web member, and described steel web member is empty steel pipe, when shearing is larger in empty steel pipe fill concrete; In step (4), the coated steel pipe that winds up of described concrete slab, described in wind up in steel pipe and be filled with concrete.
6. pre-stressed steel pipe concrete according to claim 3 combines the construction method of trusses, it is characterized in that: in step (3), when steel web member caliber is greater than while winding up steel pipe caliber, described steel web member top is provided with the junction plate that facilitates it to be connected with the steel pipe that winds up.
7. pre-stressed steel pipe concrete according to claim 3 combines the construction method of trusses, it is characterized in that: in step (2), described lower edge steel pipe is substituted by two parallel and interconnective fine steel tubes, and corresponding steel web member is welded on the fine steel tube with the steel pipe homonymy that winds up.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310035618.7A CN103061243B (en) | 2013-01-30 | 2013-01-30 | Prestressed steel tube concrete combination trussed beam and construction method thereof |
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| CN201310035618.7A CN103061243B (en) | 2013-01-30 | 2013-01-30 | Prestressed steel tube concrete combination trussed beam and construction method thereof |
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| CN103061243A CN103061243A (en) | 2013-04-24 |
| CN103061243B true CN103061243B (en) | 2014-12-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103898834B (en) * | 2014-04-24 | 2016-07-27 | 四川省交通运输厅公路规划勘察设计研究院 | A kind of steel tube concrete combination beam and truss-like Sarasota cable-stayed bridge and construction method thereof |
| CN104047223B (en) * | 2014-07-08 | 2015-12-09 | 厦门中平公路勘察设计院有限公司 | Light assembling structure bridge and construction method thereof |
| CN105735100A (en) * | 2016-04-20 | 2016-07-06 | 四川省交通运输厅公路规划勘察设计研究院 | Full-steel-pipe concrete composite bridge |
| CN105735102A (en) * | 2016-04-20 | 2016-07-06 | 四川省交通运输厅公路规划勘察设计研究院 | Concrete filled steel tube truss girder and bridge adopting concrete filled steel tube truss girder |
| CN106758750B (en) * | 2017-03-17 | 2018-08-21 | 天津城建大学 | Concrete-filled steel tube truss combination beam and construction method with replaceable floorings |
| CN106836640B (en) * | 2017-03-30 | 2019-01-04 | 贵州大学 | A kind of pre-stressed steel pipe concrete combination beam and preparation method thereof |
| CN107268889B (en) * | 2017-06-26 | 2020-06-05 | 北京交通大学 | Prestressed aluminum-concrete combined truss girder and construction method thereof |
| CN112411748B (en) * | 2020-10-28 | 2022-08-09 | 上海二十冶建设有限公司 | Method for assembling through opening of truss structure of spatial curved surface pipe |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108721A (en) * | 1992-05-12 | 1995-09-20 | 奥福里德·A·伊 | Method of post-tensioning steel/concrete truss before installation |
| CN1462325A (en) * | 2001-05-04 | 2003-12-17 | 元大渊 | Prestressed composite truss grider and construction method of the same |
| JP2004156343A (en) * | 2002-11-07 | 2004-06-03 | Kajima Corp | Composite truss bridge and its construction method |
| US6892410B2 (en) * | 2002-09-04 | 2005-05-17 | Asahi Engineering Co., Ltd. | Reinforcement structure of truss bridge or arch bridge |
| CN101158143A (en) * | 2007-11-23 | 2008-04-09 | 清华大学 | Double-deck bridge floor combined trussed girder bridge |
| CN101936054A (en) * | 2010-08-19 | 2011-01-05 | 李勇 | Steel truss web combined PC beam and construction method thereof |
| CN203096595U (en) * | 2013-01-30 | 2013-07-31 | 福州大学 | Prestress concrete filled steel tube combined braced girder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PT102968B (en) * | 2003-06-06 | 2007-09-04 | Pedro Alvares Ribeiro Do Carmo Pacheco | CIMBER WITH AUTO ADJUSTABLE PRE-EFFORT AND A METHOD OF REINFORCING CIMBRES TRAVELING SELF-ADJUSTABLE PRE-STRESS |
-
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- 2013-01-30 CN CN201310035618.7A patent/CN103061243B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108721A (en) * | 1992-05-12 | 1995-09-20 | 奥福里德·A·伊 | Method of post-tensioning steel/concrete truss before installation |
| CN1462325A (en) * | 2001-05-04 | 2003-12-17 | 元大渊 | Prestressed composite truss grider and construction method of the same |
| US6892410B2 (en) * | 2002-09-04 | 2005-05-17 | Asahi Engineering Co., Ltd. | Reinforcement structure of truss bridge or arch bridge |
| JP2004156343A (en) * | 2002-11-07 | 2004-06-03 | Kajima Corp | Composite truss bridge and its construction method |
| CN101158143A (en) * | 2007-11-23 | 2008-04-09 | 清华大学 | Double-deck bridge floor combined trussed girder bridge |
| CN101936054A (en) * | 2010-08-19 | 2011-01-05 | 李勇 | Steel truss web combined PC beam and construction method thereof |
| CN203096595U (en) * | 2013-01-30 | 2013-07-31 | 福州大学 | Prestress concrete filled steel tube combined braced girder |
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