CN101644024B - Prestress steel purlin-concrete combined continuous rigid frame bridge and construction method thereof - Google Patents

Prestress steel purlin-concrete combined continuous rigid frame bridge and construction method thereof Download PDF

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Publication number
CN101644024B
CN101644024B CN200910104675XA CN200910104675A CN101644024B CN 101644024 B CN101644024 B CN 101644024B CN 200910104675X A CN200910104675X A CN 200910104675XA CN 200910104675 A CN200910104675 A CN 200910104675A CN 101644024 B CN101644024 B CN 101644024B
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concrete
steel
bridge
guidance tape
girder
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CN200910104675XA
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CN101644024A (en
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周志祥
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Chongqing Jiaotong University
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Chongqing Jiaotong University
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Abstract

The invention discloses a prestress steel purlin-concrete combined continuous rigid frame bridge and construction method thereof. A steel purlin concrete combined structure with upper and lower swing plates is adopted, girder subsection adopts different combined interfaces according to stress demand of bridge under each construction stage and operating condition, set in vitro and vivo prestress beams are timely applied in batch, and material advantages of the two are fully played; compared with the existing prestress concrete continuous rigid frame bridge, self weight of the girder is greatly reduced, spanning capacity is obviously increased, and sub structural engineering quantity and bearing capacity requirement of foundation soil are correspondingly reduced. The invention adopts prefabricated concrete bridge road plate for splice, and the prefabricated concrete bridge road plate is joined with the steel truss girder, thus stress is clear and performance is reliable; construction is obviously simplified, quality of each parts is easy to control and check, and disease hidden troubles that the conventional prestress concrete continuous rigid frame bridge is not reliable in curve prestress long strand performance, concrete is cracked in tension and deflection is excessive for a long time caused by contraction creep are avoided.

Description

Prestress steel purlin-concrete combined continuous rigid frame bridge and job practices
Technical field
The invention belongs to bridge highway construction field, particularly a kind of prestress steel purlin-concrete combined continuous rigid frame bridge and job practices.
Background technology
Fast development along with Chinese national economy and modern transportation transport undertaking; Longspan Bridge is built increasing; Require also increasingly high to road-ability; And the prestressed concrete continuous rigid-framed bridge beam meets the basic principle of Bridges in Our Country design " safe, practical, economic, attractive in appearance ", is one of Longspan Bridge reasonable structure form of extensive use.
Continuous rigid frame bridge grows up on the firm structure of T shape and two kinds of bridge construction technical foundation of continuous beam, all belongs to the beam bridge system, and its configuration is simple; The V-arrangement river valley is had compliance preferably, and its girder is a flexural member, and main beam is continuous, the beam pier is fixed; Both keep continuous beam not have shrinkage joint, the smooth-going advantage of driving, and kept T type rigid frame bridge not establish bearing again, do not need the advantage of converting system, be convenient to cantilever construction; Have very big bending resistance and torsional rigidity, can satisfy the force request of large span bridge.Integrality performance of the structure is good, shock resistance is strong, the pontic brevity and lucidity, has functional performance preferably.Segmented free cantilever casting or free cantilever erection job practices that continuous rigid frame bridge adopts require lowlyer to the construction plant, technical maturity, safety are higher, thereby are used widely.
But conventional concrete continuous rigid frame bridge is deposited many shortcomings that is difficult to overcome, and mainly shows: along with the increase in bridge span footpath, the girder deadweight enlarges markedly, and has greatly limited the concrete continuous rigid frame bridge to the possibility of long-span bridge beam development more; Construction period is long, construction link is many; The long bundle of concrete material unstable properties and crooked prestressing force construction deviation is difficult to avoid; Cause the concrete later stage contraction, creep and loss of prestress is difficult to hold; Make the design ideal state and the Cheng Qiaohou virtual condition of bridge have obvious deviation, be prone to produce diseases such as structural cracks and Long-term Deflection be excessive;
For this reason, press for a kind of new continuous rigid frame bridge of exploitation, require deadweight lighter, construction is significantly simplified, and construction quality is prone to control, and structure stress is clearly reasonable, the cantilever construction method can be used in build the more construction of long-span bridge beam.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of prestress steel purlin-concrete combined continuous rigid frame bridge and job practices, the bridge deadweight is lighter; Construction is significantly simplified, and construction quality is prone to control, and structure stress is clearly reasonable; Be suitable for the construction of large span bridge, improve efficiency of construction, the functional performance of bridge is reliable; Good endurance, construction, maintenance and use cost are low.
Prestress steel purlin-concrete combined continuous rigid frame bridge of the present invention comprises girder, and said girder is made up of the steel truss beam of parallel longitudinal setting, and spacing is provided with lateral ties and diagonal brace between the upper and lower chord member of adjacent steel girder truss; The every vertical steel plate of steel truss top surface of the beam fixed connection constitutes the upper limb steel plate, all the integrant bottom wing steel plate of steel truss soffit fixed connection steel plate;
Bear the girder section of hogging moment near bridge pier and on the bottom wing steel plate, pour into a mould underplate concrete, vertical external prestressing steel bundle I is set in steel truss back portion; The steel truss top surface of the beam is provided with the prestressed concrete bridge guidance tape, and the concrete bridge guidance tape is integrated by segmented precast concrete plank assembly unit and constituted, and the concrete bridge guidance tape vertically is provided with compressive pre-stress, and the concrete bridge guidance tape is coupled as one through rigidity shear connector and upper limb steel plate.
Further, the girder section that bears positive bending moment away from bridge pier is provided with external prestressing steel bundle II in steel truss beam bottom, and the steel truss top surface of the beam is provided with the concrete bridge guidance tape, and the concrete bridge guidance tape is coupled as one through rigidity shear connector and upper limb steel plate;
Further, underplate concrete thickness from bridge pier along girder to both sides by thick attenuation gradually;
Further, the external prestressing steel bundle I quantity of said steel truss back portion reduces to both sides along girder from bridge pier gradually;
Further, the longitudinal prestressing steel bundle quantity and the stretching force of the longitudinal spliced back setting of precast concrete bridge guidance tape reduce to beam sections at two sides from pier back timber section gradually;
Further, steel truss beam upper limb steel plate end face spacing is provided with the rigidity shear connector, and concrete bridge guidance tape correspondence is provided with the rigidity shear connector and reserves patchhole; Seam connects through adhesive securement between the said adjacent segmented precast concrete bridge guidance tape; The rigidity shear connector inserts the rigidity shear connector of concrete bridge guidance tape and reserves patchhole, and the perfusion slightly expanded concrete is coupled as one concrete bridge guidance tape and steel truss beam in the hole.
The invention also discloses a kind of job practices of prestress steel purlin-concrete combined continuous rigid frame bridge, may further comprise the steps:
A. the construction sequence to the girder section that bears the hogging moment effect is following:
A1. accomplish the bridge pier structure construction, fixed installation braced pier top steel truss girder sections at the bridge pier top;
A2. the steel truss girder cantilever length of prefabricated steel truss girder sections extremely being set along the symmetrical successively free cantilever erection of spanning direction by steel truss girder sections two ends, pier top respectively;
A3. on the whole bottom wing steel plate of steel truss beam, pour into a mould underplate concrete;
A4. apply vertical external prestressing in steel truss back portion through prestressed strand;
A5., precast concrete bridge guidance tape is installed, and is penetrated prestressed strand through reservation pipe tunnel and apply longitudinal prestressing, the bridge guidance tape is vertically connect for whole and receive the effect of compressive pre-stress at precast concrete bridge guidance tape;
A6. reserve patchhole with the rigidity shear connector of concrete spouting precast concrete bridge guidance tape, concrete bridge guidance tape and steel truss beam are connect for whole;
A7. press the steel truss girder cantilever construction length of setting, repeat A2 to A6 step successively and continue to construct to bearing the setting beam section that the hogging moment effect finishes until the steel truss girder cantilever along span length's direction free cantilever erection construction prestress steel purlin-concrete compound beam.
B is following to the construction sequence of the girder section that bears the positive bending moment effect:
B1. behind the completing steps A7, prefabricated steel truss girder sections is continued respectively along the symmetrical successively free cantilever erection of spanning direction to steel truss beam 1 jib-length of setting;
B2., precast concrete bridge guidance tape is installed, and is penetrated prestressed strand through reservation pipe tunnel and apply longitudinal prestressing, the bridge guidance tape is vertically connect for whole and receive the effect of expection compressive pre-stress at precast concrete bridge guidance tape;
B3. reserve patchhole with concrete spouting precast concrete bridge guidance tape rigidity shear connector, concrete bridge guidance tape and steel truss beam are connect for whole;
Repeat B1 to B3 step, close up, apply vertical external prestressing through the prestressed strand that passes steel truss beam bottom bearing the positive bending moment section until the steel truss beam.
C. accomplish deck paving and other supporting facility construction.
The invention has the beneficial effects as follows: prestress steel of the present invention purlin-concrete combined continuous rigid frame bridge structure and job practices; Stressed needs according to each position of continuous rigid frame bridge girder; The combining structure that adopts steel truss girder and concrete to combine, and apply an amount of prestressing force in good time by stages, given full play to the material advantage of steel and concrete; The girder deadweight is significantly reduced with respect to conventional prestress concrete beam; Substructure size and bearing capacity of foundation soil require corresponding reduction, can be applicable to the construction of large span continuous rigid frame bridge, and the present invention has accomplished 400 meters preliminary design of striding such bridge of footpath through calculating; Construction technology is significantly simplified; Avoided conventional prestress concrete continuous rigid frame bridge to need the large-tonnage cantilever to hang a series of bulky equipment and complicated technologies such as the long bundle installation of frame shuttering, reinforcing bar binding, Cast-in-place concrete, crooked long prestressing force and stretch-draw anchor under the varying environment of blue, thousands of times; Reduction of erection time; Each construction link and quality are all easy to control, and bridge force-bearing is clear and definite, and then structural performance is reliable and stable; Steel-concrete combined continuous rigid frame bridge carries out different combinations and connects in good time at each construction stressed needs different with operational phase according to structure; Except that section top, pier top is the prestressed concrete bridge guidance tape; All the other each parts are drawn to be steel work; Pressurized is for the concrete being main steel-concrete combining structure; The bridge guidance tape is the whole structure of precast concrete plank assembly unit post-tensioned prestressing knot, has avoided concrete crack in tension and shrinkage and creep to cause the disease hidden danger that Long-term Deflection is excessive basically, so long-term structural performance is reliable;
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 1 is a bridge girder structural representation of the present invention;
Fig. 2 bears the negative moment area structural representation for girder;
Fig. 3 be Fig. 2 along A-A to sectional view;
Fig. 4 bears positive bending moment section structure sketch map for girder;
Fig. 5 be Fig. 4 along B-B to sectional view.
The specific embodiment
Fig. 1 is a bridge girder structural representation of the present invention, and Fig. 2 bears the negative moment area structural representation for girder, Fig. 3 be Fig. 2 along A-A to sectional view; Fig. 4 bears positive bending moment section structure sketch map for girder; Fig. 5 be Fig. 4 along B-B to sectional view, the prestress steel purlin-concrete combined continuous rigid frame bridge of present embodiment comprises girder; Said girder is made up of the steel truss beam 1 of parallel longitudinal setting, and spacing is provided with lateral ties and diagonal brace between the upper and lower chord member of adjacent steel girder truss 1; Every steel truss beam 1 end face vertical steel plate that is fixedly connected constitutes the upper limb steel plate, all the integrant bottom wing steel plates of steel truss beam 1 bottom surface fixed connection steel plate;
Bear the girder section of hogging moment near bridge pier 6 and on the bottom wing steel plate, pour into a mould underplate concrete 3, vertical external prestressing steel bundle I 2 is set at steel truss beam 1 top; Steel truss beam 1 end face is provided with prestressed concrete bridge guidance tape 4; Concrete bridge guidance tape 4 is integrated by segmented precast concrete plank assembly unit and is constituted; Concrete bridge guidance tape 4 vertically is provided with compressive pre-stress; Concrete bridge guidance tape 4 is coupled as one through rigidity shear connector and upper limb steel plate, increases coupling stiffness, improves mechanism's load ability.
In the present embodiment, the girder section that bears positive bending moment away from bridge pier 6 is provided with external prestressing steel bundle II 7 in steel truss beam 1 bottom, and the steel truss top surface of the beam is provided with concrete bridge guidance tape 4, and concrete bridge guidance tape 4 is coupled as one through rigidity shear connector and upper limb steel plate; Improve the stability and the durability of bridge.
In the present embodiment, underplate concrete 3 thickness from bridge pier 6 along girder to both sides by thick attenuation gradually; External prestressing steel bundle I 2 quantity at said steel truss beam 1 top reduce to both sides along girder from bridge pier 6 gradually; Longitudinal prestressing steel bundle 5 quantity and stretching force that precast concrete bridge guidance tape 4 longitudinal spliced backs are provided with reduce to beam sections at two sides from pier back timber section gradually; According to stressing conditions reasonable distribution prestressing force and concrete slab thickness, guarantee can also alleviate deadweight when holding capacity is stable, be beneficial to the footpath of striding that increases free cantilever erection in the further assurance work progress.
In the present embodiment, steel truss beam 1 upper limb steel plate end face spacing is provided with the rigidity shear connector, and concrete bridge guidance tape 4 correspondences are provided with the rigidity shear connector and reserve patchhole 41; Seam connects through adhesive securement between the said adjacent segmented precast concrete bridge guidance tape; The rigidity shear connector inserts the rigidity shear connector of concrete bridge guidance tape 4 and reserves patchhole 41, and the perfusion slightly expanded concrete is coupled as one concrete bridge guidance tape 4 and steel truss beam 1 in the hole; Adopt the slightly expanded concrete perfusion in the present embodiment, it is simple and convenient to construct, and the rigidity of structure is big.
Prestress steel purlin-the concrete combined continuous rigid frame bridge construction method of present embodiment may further comprise the steps:
A. it is following bridge to be born the construction sequence of section of hogging moment effect:
A1. accomplish bridge pier 6 structure constructions, fixed installation braced pier top steel truss girder sections at bridge pier 6 tops;
A2. steel truss beam 1 jib-length of prefabricated steel truss girder sections extremely being set along the symmetrical successively free cantilever erection of spanning direction by steel truss girder sections two ends, pier top respectively;
A3. on the whole bottom wing steel plate of steel truss beam 1, pour into a mould underplate concrete 3;
A4. apply vertical external prestressing at steel truss beam 1 top through prestressed strand 2;
A5., precast concrete bridge guidance tape and bonding contiguous prefabricated concrete bridge guidance tape splicing integration formation concrete bridge guidance tape 4 are installed; And penetrate prestressed strand 5 through the reservation pipe tunnel at precast concrete bridge guidance tape and apply longitudinal prestressing, bridge guidance tape 4 is vertically connect for whole and receive the effect of compressive pre-stress;
A6. reserve patchhole 41 with the rigidity shear connector of concrete spouting precast concrete bridge guidance tape, concrete bridge guidance tape 4 and steel truss beam are connect for whole; Increase coupling stiffness, be beneficial to further raising weight capacity, thereby be beneficial to the footpath of striding that increases construction bridges;
A7. by the steel truss beam 1 cantilever construction length of setting, repeat A2 to A6 step successively and continue along span length's direction free cantilever erection construction prestress steel purlin-concrete compound beam, until steel truss beam 1 cantilever construction to bearing the setting beam section that the hogging moment effect finishes.
B bears the positive bending moment effect to bridge the construction sequence of section is following:
B1. behind the completing steps A7, prefabricated steel truss girder sections is continued respectively along the symmetrical successively free cantilever erection of spanning direction to steel truss beam 1 jib-length of setting;
B2., precast concrete bridge guidance tape 4 is installed, and is penetrated prestressed strand through reservation pipe tunnel and apply longitudinal prestressing, bridge guidance tape 4 is vertically connect for whole and receive the effect of expection compressive pre-stress at precast concrete bridge guidance tape 4;
B3. reserve patchhole 41 with concrete spouting precast concrete bridge road 4 plate rigidity shear connectors, concrete bridge guidance tape 4 and steel truss beam 1 are connect for whole;
Repeat B1 to B3 step, close up until steel truss beam 1; Apply vertical external prestressing to bearing the positive bending moment section through the prestressed strand that passes steel truss beam 1 bottom; Receive the positive bending moment section that steel truss girder is applied vertical stretch-draw prestressing force, guaranteeing the stability and the durability of bridge;
C. accomplish deck paving and other supporting facility construction.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (7)

1. prestress steel purlin-concrete combined continuous rigid frame bridge, it is characterized in that: comprise girder, said girder is made up of the steel truss beam of parallel longitudinal setting, and spacing is provided with lateral ties and diagonal brace between the upper and lower chord member of adjacent steel girder truss; The every vertical steel plate of steel truss top surface of the beam fixed connection constitutes the upper limb steel plate, all the integrant bottom wing steel plate of steel truss soffit fixed connection steel plate;
Bear the girder section of hogging moment near bridge pier and on the bottom wing steel plate, pour into a mould underplate concrete, vertical external prestressing steel bundle I is set in steel truss back portion; The steel truss top surface of the beam is provided with the prestressed concrete bridge guidance tape, and the concrete bridge guidance tape is integrated by segmented precast concrete plank assembly unit and constituted, and the concrete bridge guidance tape vertically is provided with compressive pre-stress, and the concrete bridge guidance tape is coupled as one through rigidity shear connector and upper limb steel plate.
2. prestress steel purlin-concrete combined continuous rigid frame bridge according to claim 1; It is characterized in that: the girder section that bears positive bending moment away from bridge pier is provided with external prestressing steel bundle II in steel truss beam bottom; The steel truss top surface of the beam is provided with the concrete bridge guidance tape, and the concrete bridge guidance tape is coupled as one through rigidity shear connector and upper limb steel plate.
3. prestress steel purlin-concrete combined continuous rigid frame bridge according to claim 2 is characterized in that: underplate concrete thickness from bridge pier along girder to both sides by thick attenuation gradually.
4. prestress steel purlin-concrete combined continuous rigid frame bridge according to claim 3 is characterized in that: the external prestressing steel bundle I quantity of said steel truss back portion reduces to both sides along girder from bridge pier gradually.
5. prestress steel purlin-concrete combined continuous rigid frame bridge according to claim 4 is characterized in that: longitudinal prestressing steel bundle quantity and stretching force that the longitudinal spliced back of precast concrete bridge guidance tape is provided with reduce to beam sections at two sides from pier back timber section gradually.
6. prestress steel purlin-concrete combined continuous rigid frame bridge according to claim 5 is characterized in that: girder truss upper limb steel plate end face spacing is provided with the rigidity shear connector, and concrete bridge guidance tape correspondence is provided with the rigidity shear connector and reserves patchhole; Seam connects through adhesive securement between the adjacent segmented precast concrete bridge guidance tape, and the rigidity shear connector inserts the rigidity shear connector of concrete bridge guidance tape and reserves patchhole, and the perfusion slightly expanded concrete is coupled as one concrete bridge guidance tape and steel truss beam in the hole.
7. prestress steel purlin-concrete combined continuous rigid frame bridge construction method is characterized in that: may further comprise the steps:
A. the construction sequence to the girder section that bears the hogging moment effect is following:
A1. accomplish the bridge pier structure construction, fixed installation braced pier top steel truss girder segment at the bridge pier top;
A2. the steel truss girder cantilever length of prefabricated steel truss girder segment extremely being set along the symmetrical successively free cantilever erection of spanning direction by steel truss girder segment two ends, pier top respectively;
A3. on the whole bottom wing steel plate of steel truss beam, pour into a mould underplate concrete;
A4. apply vertical external prestressing in steel truss back portion through prestressed strand;
A5., precast concrete bridge guidance tape is installed, and is penetrated prestressed strand through reservation pipe tunnel and apply longitudinal prestressing, the bridge guidance tape is vertically connect for whole and receive the effect of compressive pre-stress at precast concrete bridge guidance tape;
A6. reserve patchhole with the rigidity shear connector of concrete spouting precast concrete bridge guidance tape, concrete bridge guidance tape and steel truss beam are connect for whole;
A7. press the steel truss girder cantilever construction length of setting, repeat A2 to A6 step successively and continue to construct to bearing the setting beam section that the hogging moment effect finishes until the steel truss girder cantilever along span length's direction free cantilever erection construction prestress steel purlin-concrete compound beam;
B is following to the construction sequence of the girder section that bears the positive bending moment effect:
B1. behind the completing steps A7, prefabricated steel truss girder segment is continued respectively along the symmetrical successively free cantilever erection of spanning direction to steel truss beam 1 jib-length of setting;
B2., precast concrete bridge guidance tape is installed, and is penetrated prestressed strand through reservation pipe tunnel and apply longitudinal prestressing, the bridge guidance tape is vertically connect for whole and receive the effect of expection compressive pre-stress at precast concrete bridge guidance tape;
B3. reserve patchhole with concrete spouting precast concrete bridge guidance tape rigidity shear connector, concrete bridge guidance tape and steel truss beam are connect for whole;
Repeat B1 to B3 step, close up, apply vertical external prestressing through the prestressed strand that passes steel truss beam bottom bearing the positive bending moment section until the steel truss beam;
C. accomplish deck paving and other supporting facility construction.
CN200910104675XA 2009-08-21 2009-08-21 Prestress steel purlin-concrete combined continuous rigid frame bridge and construction method thereof Expired - Fee Related CN101644024B (en)

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CN101906751A (en) * 2010-07-20 2010-12-08 郑志文 Ready-package emergency bridge and construction method for changing same into permanent bridge
CN102409603A (en) * 2011-07-29 2012-04-11 中铁大桥勘测设计院有限公司 Double-layer steel-truss concrete laminated arch structure and construction method thereof
CN102493345B (en) * 2011-11-29 2014-03-26 广州瀚阳工程咨询有限公司 Manufacture method for prefabricating support-free system bridge sections
CN102535327B (en) * 2012-02-03 2014-06-04 西安中交土木科技有限公司 Through prestress steel truss and concrete combined continuous steel structure bridge and construction method thereof
CN103290785B (en) * 2013-06-30 2015-07-01 中铁一局集团有限公司 Closure method for height variable continuous steel truss girder
CN103758023B (en) * 2014-01-23 2017-01-25 长沙理工大学 Prestressed concrete and steel truss mixed continuous rigid frame bridge and construction method thereof
CN105780670A (en) * 2014-12-23 2016-07-20 任丘市永基建筑安装工程有限公司 Overall stabilization technology for steel bridge frame
CN105951574B (en) * 2016-05-06 2017-10-31 中铁大桥勘测设计院集团有限公司 The construction method of continuous composite beam bridge
CN110331650B (en) * 2019-07-03 2021-05-04 中铁大桥勘测设计院集团有限公司 Public-rail dual-purpose prestressed continuous steel truss combination beam and construction method thereof

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