CN101691742A - Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges - Google Patents
Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges Download PDFInfo
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- CN101691742A CN101691742A CN200910272380A CN200910272380A CN101691742A CN 101691742 A CN101691742 A CN 101691742A CN 200910272380 A CN200910272380 A CN 200910272380A CN 200910272380 A CN200910272380 A CN 200910272380A CN 101691742 A CN101691742 A CN 101691742A
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Abstract
The invention provides a construction method for back-cable-balance single-side cantilever concreted beam bodies of slant-legged rigid frame bridges, which belongs to the technical field of bridge construction. The method comprises the following steps: A, pre-embedding corrugated tubes (1) and anchor plates in corresponding side spans (2) on abutments (8); B, pre-embedding the corrugated tubes (1) in the side spans (2), concreting the side spans (2), passing and stretching balance back cables (3) into the corrugated tubes (1) and temporarily locking the side spans (2) with the abutments (8); C, adopting movable suspended scaffolding (4) to concrete a middle span (6) from slant legs and a No. 0 block (5) to a span-middle cantilever-type subsection; and D, allowing the abutments (8) at two ends to simultaneously remove the balance back cables (3) after a middle-span closure section (7) is concreted. The method has the advantages of simple process, no need for large-sized lifting-balancing equipment, no limit to sites, high bridge quality, few construction brackets, low cost and applicability particularly to the construction of large-span slant-legged rigid frame concrete bridges in high mountains and deep valleys.
Description
Technical field
The invention belongs to civil engineering bridge technology field, be specifically related to the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body.
Background technology
The slant legged rigid frame bridge moulding is tall and straight, and is merrily and lightheartedly attractive in appearance, simple in structure, good integrity, and the stressed advantage that has continuous beam and arch bridge concurrently is so obtained application in highway, the railway at home.
The method that slant legged rigid frame bridge beam body construction is commonly used has two kinds, and the one, the construction of support method is finished construction to whole beam bodies by setting up the support formwork erection, is characterized in that the equipment requirement is low, but the site requirements height, influence is current; The 2nd, no rack technique construction, by flat turn or vertical transfer after utilize lifting balancing equipment cantilever pouring beam body such as Sarasota, being characterized in need not support or only need a small amount of support, can adapt to abominable orographic condition, do not influence navigation or current, but the lifting balancing equipment is more, requires high.
Traditional slant legged rigid frame bridge beam body construction method shortcoming is: need set up support or the balance hanging device is installed, requiring has enough places, and support or balance hanging device set up and dismounting delays the duration, influence bridge and crosses over the traffic of distinguishing.
Summary of the invention
The objective of the invention is to need set up support or the balance hanging device is installed at slant legged rigid frame bridge, require the place big, defective and deficiency that the construction period is long propose a kind of job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body.This job practices need not support and large-scale lifting balancing equipment, not limited by the place, easy construction, and technology is simple, and the duration is short, cost is low, dependable performance.
The object of the present invention is achieved like this: the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body may further comprise the steps:
A. finish the construction of abutment, battered leg basis, battered leg and No. 0 piece earlier, and on abutment pre-buried bellows of corresponding end bay and anchor tackle bearing plate, or reserve the pipe fitting can penetrate the balance dorsal funciculus;
B. pre-buried bellows or reserve the pipe fitting can penetrate the balance dorsal funciculus in end bay, the placing end bay, treat that end bay reaches design strength after, penetrate in bellows on end bay and abutment or the pipe fitting and stretch-draw balance dorsal funciculus, end bay and abutment are locked temporarily;
C. adopt Hanging Basket to begin in span centre cantilevered segmentation placing, to stride from battered leg and No. 0 piece;
D. stride in treating the closure segment placing finish and reach design strength more than 90% after, the two ends abutment is removed the balance dorsal funciculus simultaneously, construction forms full-bridge to carry out that again deck paving, railing set up etc.
Among the described step B, during the placing end bay, set up the support and the forming panel of end bay earlier, pour into a mould end bay again.
Among the described step B, before the stretch-draw of balance dorsal funciculus, with the rigid support thing beam-ends between end bay and the abutment is stitched jam-pack earlier.
Among the described step C, in the middle of the continuous beam section of striding when being prestressing force box beam, concrete pouring procedure is: bottom board at first, pour into a mould web and top board again, concrete floor is poured into a mould to the direction of end bay by cantilever end, symmetrical then laminated pouring web concrete, web concrete is gone into mould by end face, the cast of top board is by being undertaken by the order of continuous beam section two side direction central authorities cast, each save continuous beam section concrete intensity reach design strength 80% after, just can carry out the stretch-draw operation of prestressing tendon, hole path pressure grouting intensity reaches 80% of design strength later on could mobile Hanging Basket.
Among the described step D, in stride closure segment and adopt slightly expanded concrete, the label of slightly expanded concrete than in to stride the design label of beam section high half grade.
Among the described step D, in the middle of when striding to prestressing force box beam, wait to stride the closure segment placing finish and reach design strength more than 90% after, the prestressing tendon on the pretensioned concrete base plate is removed the balance dorsal funciculus of pontic both sides, the prestressing tendon on the stretch-draw web more then simultaneously.
By technique scheme, the invention has the beneficial effects as follows:
1, support or large-scale lifting balancing equipment is installed be need not set up,, large number quipments and time saved, remarkable in economical benefits especially for the bigger bridge of span;
2, technology is simple, only needs pre-buried bellows and ground tackle, carries out stretch-draw by calculated data, and is easy to operate;
3, the balance dorsal funciculus is embedded in abutment and the beam body, not limited by the place, does not influence currently, does not affect the appearance after the completion;
4, the balance dorsal funciculus is removed the original design of axle casing recovery stress form, to crossstructure and stressed no follow-up influence.
Description of drawings
Fig. 1 is the schematic diagram that abutment 8 of the present invention, battered leg basis, battered leg and No. 0 piece 5 completions are shaped;
Fig. 2 is end bay 2 of the present invention and the abutment 8 interim schematic diagrames that lock;
Fig. 3 is the schematic diagram of striding 6 one-sided cantilever placing among the present invention;
Fig. 4 is the schematic diagram that full-bridge of the present invention is shaped.
Among the figure: bellows 1, end bay 2, balance dorsal funciculus 3, Hanging Basket 4, battered leg and No. 0 piece 5, in stride 6, in stride closure segment 7, abutment 8.
The specific embodiment
The present invention is described in further detail below in conjunction with description of drawings and the specific embodiment.
Referring to Fig. 1-Fig. 4, the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body of the present invention may further comprise the steps:
A. finish the construction of abutment 8, battered leg basis, battered leg and No. 0 piece 5 earlier, and on abutment 8 corresponding end bay 2 pre-buried bellows 1 and anchor tackle bearing plates, or reserve the pipe fitting can penetrate balance dorsal funciculus 3;
B. pre-buried bellows 1 or reserve the pipe fitting can penetrate balance dorsal funciculus 3 in end bay 2, placing end bay 2, treat that end bay 2 reaches design strength after, penetrate in bellows 1 on end bay 2 and abutment 8 or the pipe fitting and stretch-draw balance dorsal funciculus 3, end bay 2 and abutment 8 are locked temporarily;
C. adopt Hanging Basket 4 to begin in span centre cantilevered segmentation placing, to stride 6 from battered leg and No. 0 piece 5;
D. stride in treating closure segment 7 placing finish and reach design strength more than 90% after, two ends abutment 8 is removed balance dorsal funciculus 3 simultaneously, construction forms full-bridge to carry out that again deck paving, railing set up etc.
The test that the present invention carries out on the firm structure prestressed concrete continuous beam of railway battered leg bridge is as follows:
Embodiment 1: the construction of end bay 2
As Fig. 1, Fig. 2, corresponding end bay 2 pre-buried bellows 1 and anchor tackle bearing plates on the abutment 8 of bridge both sides, or reservation can penetrate the pipe fitting of balance dorsal funciculus 3, after abutment 8, battered leg basis, battered leg and No. 0 piece 5 constructions of bridge both sides are finished, adopt military pier, military beam to carry out the cast-in-place construction of both sides end bay 2 as the support that end bay 2 is installed.
Construction sequence is:
1.1. ground is handled.Military pier foundation all adopts concrete foundation, and places on the stable rock foundation, to guarantee not sedimentation of basis.
1.2. frame founds military pier, sets up military beam.
1.3. pre-pressing bracket.Put bed die on military beam well, the sand pocket of weight such as pile and Liang Ti carries out precompressed.On the bed die both sides absolute altitude observation point is set before loading, and measures absolute altitude.Load back observation every day once, up to 48 hours accumulative total deflections less than 1.0mm.Measure absolute altitude after the unloading once more.According to before loading and the absolute altitude after the unloading calculate the non-resilient and elastic deformation of support (comprising ground) and camber be set with this.
1.4. adjust the bed die absolute altitude, camber be set.
1.5. installation external mold.External mold adopts Overall Steel Formwork.
1.6. colligation base plate reinforcing bar and web reinforcement are installed the baseboard prestress pipeline, the prestress pipe of web longitudinal prestressing pipeline, beam section balance dorsal funciculus 3 is a bellows 1.Can be two-layer according to crossstructure bellows 1 by arranging up and down, arrange 2-4 root bellows 1 for every layer.
1.7. installation internal mold.
1.8. installation anchor plate, and and seal for pipe joints.
1.9. installation end template.
1.10. colligation top board reinforcing bar is installed top board prestress pipe and anchor plate.
1.11. concrete perfusion and timely covering curing.
1.12. the prestressing tendon lashing, the P type anchor of abutment 8 one ends on the installation end bay 2, fluid concrete sealing P type anchor.The prestressing force of end bay 2 is designed to unidirectional stretch-draw, and abutment 8 one ends on the end bay 2 are P type anchor, and battered leg and No. 0 piece 5 are the stretch-draw end.
1.13. beam body and end-blocking concrete strength reach design strength 80% after, the prestressing tendon of stretch-draw end bay 2.
1.14. the prestress pipe mud jacking of end bay 2.
1.15. the balance dorsal funciculus 3 of end bay 2 beam-ends is installed.Penetrate balance dorsal funciculus 3 in bellows 1, balance dorsal funciculus 3 is a prestressing tendon, treat that end bay 2 concrete strengths reach 100% after, stretch-draw balance dorsal funciculus 3.One end of balance dorsal funciculus 3 is passed abutment 8 be fixed on abutment 8 or abutment 8 massif behind, the bellows 1 that the other end of balance dorsal funciculus 3 passes end bay 2 beam-ends is fixed on the end bay 2 near on the solid beam body of abutment 8 one ends.Before stretch-draw, with rigid support thing such as steel plate the beam-ends between end bay 2 and the abutment 8 is stitched jam-pack, avoid because of stretching force pulling battered leg and No. 0 piece 5.
Embodiment 2: in stride 6 and in stride the construction of closure segment 7
Referring to Fig. 3, Fig. 4 after end bay 2 and the interim locking of the abutment body of abutment 1, can install and hang bluely 4, strides 6 cantilever placing in carrying out, promptly adopt Hanging Basket 4 on battered leg and No. 0 piece 5, to build forming and stride 6 to the segmentation of span centre cantilevered, until in stride 6 and close up at span centre.In 6 the process of building moulding of striding be: stride 6 beam section in the correspondence on Hanging Basket 4 bed die and outboard template are installed, internal mold places on the plate top surface, concrete perfusion then, stretch-draw mud jacking.
2.1. the flow process of cradle construction
At the bottom of lifting Hanging Basket 4 and bottom die platform, the installation bed die → outer side form → colligation of lifting, web reinforcement and prestressing force bellows → installation internal mold → colligation top board reinforcing bar and prestressing force bellows → each position measurement detection → concrete perfusion → stretch-draw mud jacking → Hanging Basket 4 move.
2.2. in stride the construction of closure segment 7
After in finishing, striding the concrete pouring of 6 cantilevered each beam section, stride the construction of closure segment 7 in can preparing.Its method is: after striding 6 cantilevered continuous beam section baseboard prestress rope during stretch-draw is intact, lay down the Hanging Basket 4 of striding in pontic one side on 6, the Hanging Basket 4 of striding on 6 in the pontic opposite side moves forward to span centre simultaneously, stride across behind the closure segment 7 Hanging Basket 4 bottom die platform anchors on the base plate of two continuous beam sections of closed position, outer side form is suspended on the frange plate of two beam sections, and internal mold places on the plate top surface, and inside and outside intermode is strained with split bolt, concrete perfusion then, the stretch-draw mud jacking.
Construction point:
2.2.1. before closing up, in stride on 6 each sections prestressing tendon of continuous beam section and want mud jacking to finish.
2.2.2. formwork erection is installed reinforcing bar and prestressed pore passage, and observes the absolute altitude situation, if absolute altitude and line style control do not meet, do the ballast adjustment.
2.2.3. in the prestressing tendon of striding on the closure segment 7 shift to an earlier date lashing.
Adopt stiff skeleton to construct 2.2.4. close up construction, when stiff skeleton is welded, around built-in fitting, water, prevent beam body concrete burn.
2.2.5. the slightly expanded concrete of apolegamy test in advance.Concrete label is higher half grade than the design label of case beam.
2.2.6. the concrete spouting temperature of closure segment is controlled in the design allowed band, designing requirement is not higher than 15 ℃.
2.2.7. the closure segment concrete spouting is tried one's best the shortening time, generally is controlled in 2-3 hour to finish.
2.2.8. concrete strength reach design strength more than 90% after, the prestressing tendon on the pretensioned concrete base plate is removed the balance dorsal funciculus 3 of pontic both sides, the prestressing tendon on the stretch-draw web more then simultaneously.
2.2.9. in stride the prestressing tendon stretch-draw of closure segment 7 before, must not on the case beam, apply or the removal load.
The inventive method is tested on the firm structure prestressed concrete continuous beam of battered leg railway bridge, this bridge is a Line for Passenger Transportation ballastless track bridge, 90 meters of maximum spans, design speed 250 kms/hour, the technology of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body construction is easy, need not large-scale lifting balancing equipment, not limited by the place, pontic quality height, construction bracket is few, cost is low, is specially adapted to the firm structure concrete-bridge of the large span battered leg construction of high mountains and deep gullies.
Claims (6)
1. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body is characterized in that may further comprise the steps:
A. finish the construction of abutment (8), battered leg basis, battered leg and No. 0 piece (5) earlier, and go up pre-buried bellows of corresponding end bay (2) (1) and anchor tackle bearing plate, or reserve the pipe fitting that can penetrate balance dorsal funciculus (3) at abutment (8);
B. pre-buried bellows (1) or reserve the pipe fitting to penetrate balance dorsal funciculus (3) in end bay (2), placing end bay (2), after treating that end bay (2) reaches design strength, penetrate in bellows (1) on end bay (2) and abutment (8) or the pipe fitting and stretch-draw balance dorsal funciculus (3), with the interim locking of end bay (2) and abutment (8);
C. adopt Hanging Basket (4) in span centre cantilevered segmentation placing, to stride (6) from battered leg and No. 0 piece (5) beginning;
D. stride in treating closure segment (7) placing finish and reach design strength more than 90% after, two ends abutment (8) is removed balance dorsal funciculus (3) simultaneously, construction forms full-bridge to carry out that again deck paving, railing set up etc.
2. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body according to claim 1 is characterized in that: among the described step B, during placing end bay (2), set up the support and the forming panel of end bay (2) earlier, pour into a mould end bay (2) again.
3. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body according to claim 1, it is characterized in that: among the described step B, before balance dorsal funciculus (3) stretch-draw, with the rigid support thing beam-ends between end bay (2) and the abutment (8) is stitched jam-pack earlier.
4. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body according to claim 1, it is characterized in that: among the described step C, in the middle of stride (6) when the prestressing force box beam, concrete pouring procedure is: bottom board at first, pour into a mould web and top board again, concrete floor is poured into a mould to the direction of end bay (2) by cantilever end, symmetrical then laminated pouring web concrete, web concrete is gone into mould by end face, the cast of top board is by being undertaken by the order of continuous beam section two side direction central authorities cast, each save continuous beam section concrete strength reach design strength 80% after, just can carry out the stretch-draw operation of prestressing tendon, hole path pressure grouting intensity reaches 80% of design strength later on could mobile Hanging Basket (4).
5. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body according to claim 1, it is characterized in that: among the described step D, in stride closure segment (7) and adopt slightly expanded concrete, the label of slightly expanded concrete than in to stride the design label of (6) continuous beam section high more than half grade.
6. the job practices of slant legged rigid frame bridge dorsal funciculus balance side cantilever placing beam body according to claim 1, it is characterized in that: among the described step D, in the middle of stride (6) continuous beam section when being prestressing force box beam, wait to stride closure segment (7) placing finish and reach design strength more than 90% after, prestressing tendon on the pretensioned concrete base plate is removed the balance dorsal funciculus (3) of pontic both sides, the prestressing tendon on the stretch-draw web more then simultaneously.
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| CN101929130A (en) * | 2010-09-19 | 2010-12-29 | 中铁十二局集团有限公司 | Hanging basket device for closure construction of continuous box girders |
| CN105088971A (en) * | 2015-09-09 | 2015-11-25 | 上海城建市政工程（集团）有限公司 | Mid-span closure construction method of corrugated steel web PC box girder cable-stayed bridge |
| CN108374322A (en) * | 2018-04-04 | 2018-08-07 | 中铁第四勘察设计院集团有限公司 | A kind of asymmetric main push-towing rope railway Suspension bridge structure |
| CN110374011A (en) * | 2019-07-23 | 2019-10-25 | 中国十七冶集团有限公司 | Across the operation platform closed up in a kind of continuous rigid frame bridge |
| CN111395168A (en) * | 2020-03-13 | 2020-07-10 | 中铁六局集团广州工程有限公司 | Continuous rigid frame separation type 0# block temporary filling device and construction method |
| CN112065442A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam closure section construction method based on karst cave underground river environment tunnel construction |
| CN112065438A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam third section construction method based on karst cave underground river environment tunnel construction |
| CN114673066A (en) * | 2022-03-24 | 2022-06-28 | 四川蜀道新制式轨道集团有限责任公司 | Ground anchor type inclined leg rigid frame bridge and construction method thereof |
| CN115404754A (en) * | 2022-10-31 | 2022-11-29 | 湖南省交通规划勘察设计院有限公司 | Bridge applied to canyon with medium width and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101929130A (en) * | 2010-09-19 | 2010-12-29 | 中铁十二局集团有限公司 | Hanging basket device for closure construction of continuous box girders |
| CN105088971A (en) * | 2015-09-09 | 2015-11-25 | 上海城建市政工程（集团）有限公司 | Mid-span closure construction method of corrugated steel web PC box girder cable-stayed bridge |
| CN108374322A (en) * | 2018-04-04 | 2018-08-07 | 中铁第四勘察设计院集团有限公司 | A kind of asymmetric main push-towing rope railway Suspension bridge structure |
| CN110374011A (en) * | 2019-07-23 | 2019-10-25 | 中国十七冶集团有限公司 | Across the operation platform closed up in a kind of continuous rigid frame bridge |
| CN111395168A (en) * | 2020-03-13 | 2020-07-10 | 中铁六局集团广州工程有限公司 | Continuous rigid frame separation type 0# block temporary filling device and construction method |
| CN111395168B (en) * | 2020-03-13 | 2021-12-03 | 中铁六局集团广州工程有限公司 | Continuous rigid frame separation type 0# block temporary filling device and construction method |
| CN112065442A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam closure section construction method based on karst cave underground river environment tunnel construction |
| CN112065438A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam third section construction method based on karst cave underground river environment tunnel construction |
| CN114673066A (en) * | 2022-03-24 | 2022-06-28 | 四川蜀道新制式轨道集团有限责任公司 | Ground anchor type inclined leg rigid frame bridge and construction method thereof |
| CN114673066B (en) * | 2022-03-24 | 2023-09-19 | 四川蜀道新制式轨道集团有限责任公司 | Ground anchor type inclined leg rigid frame bridge and construction method thereof |
| CN115404754A (en) * | 2022-10-31 | 2022-11-29 | 湖南省交通规划勘察设计院有限公司 | Bridge applied to canyon with medium width and construction method |
| CN115404754B (en) * | 2022-10-31 | 2023-01-17 | 湖南省交通规划勘察设计院有限公司 | Bridge applied to canyon with medium width and construction method |
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