CN101260644B - Method of manufacture for simply supported girder box - Google Patents

Method of manufacture for simply supported girder box Download PDF

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Publication number
CN101260644B
CN101260644B CN2008101042326A CN200810104232A CN101260644B CN 101260644 B CN101260644 B CN 101260644B CN 2008101042326 A CN2008101042326 A CN 2008101042326A CN 200810104232 A CN200810104232 A CN 200810104232A CN 101260644 B CN101260644 B CN 101260644B
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China
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web
presstressed reinforcing
steel
reinforcing steel
sides
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CN2008101042326A
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Chinese (zh)
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CN101260644A (en
Inventor
邓运清
徐升桥
候建军
田杨
刘玉亮
陈万龙
王文利
常喆
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中铁工程设计咨询集团有限公司
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Priority to CN2008101042326A priority Critical patent/CN101260644B/en
Publication of CN101260644A publication Critical patent/CN101260644A/en
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Publication of CN101260644B publication Critical patent/CN101260644B/en

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Abstract

The invention discloses a simple box girder, comprising a top plate, a left web plate, a right web plate and a soleplate, wherein, the cross section of the box girder is a single-box and single-chamber cross section of the left web plate and the right web plate by adopting a bevel web plate and a great chamfer angle. The simple box girder has simple and clear force, compact shape and beautiful appearance. The single-box and single-chamber full-span simple box girder has a closed cross section, can provide a greater bending resistance and the anti-rotation rigidity necessary to the high speed running, and has good service durability. The full prestressing structure is used under the loading, the girder body is in the pressed state for all the time, the built bridge girder has small workload of the maintenance. Compared with the prior situ beam, the box girder adopting the full-span prefabricated technology can shorten the construction period and reduce the temporary support fee. The design of section considers fully and adopts the integrated hydraulic pressure internal mold and the die tensioned technique, the construction steps are programmed, thereby being beneficial to improving the working efficiency and guaranteeing the quality.

Description

A kind of manufacture method of simple supported box beam

Technical field

The present invention relates to the bridge field, particularly relate to a kind of manufacture method of simple supported box beam.

Background technology

The post stressed concrete simple supported box beam is used comparatively extensive in China, a large amount of employings is split blade type freely-supported T beam on Existing Railway Line, below the design road speed 200km/h.It is fast that the passenger dedicated railway line of speed per hour more than 250 kilometers has speed, to the demanding characteristics of infrastructure under line track ride comfort, the line, design for bridge construction just can not only be confined to the static(al) design, must take all factors into consideration the acting in conjunction of rolling stock, circuit, bridge, safety and driving comfort index, bridge dynamic response according to rolling stock limit vertical, the Transverse Stiffness Limit of controlling bridge, carry out the power design.

Summary of the invention

The purpose of this invention is to provide a kind of good integrity that has, perpendicular, lateral stiffness is big, the torsional property height, structure durability can wait the manufacture method of the simple supported box beam of characteristics well.

For achieving the above object, on the one hand, technical scheme of the present invention provides a kind of manufacture method of simple supported box beam, and this simple supported box beam comprises top board, left and right sides web and base plate, and the cross section of described case beam is the single box single chamber cross section that described left and right sides web adopts oblique web, big chamfering;

Wherein, the gradient of described left and right sides web is between 1: 10~1: 3; The outer chamfer radius of described top board and web junction, the described left and right sides is 200~1500mm, and the interior chamfering of described top board and web junction, the described left and right sides is provided with vertical chamfering, and the following chamfer radius of described left and right sides web and described base plate intersection is 100~300mm;

Wherein, described simple supported box beam spaning middle section top board, base plate thickness 250~300mm, described left and right sides web thickness 350~500mm; Described simple supported box beam end section top board, base plate thickness 500~700mm, described left and right sides web thickness 800~1100mm;

Wherein, be provided with the web presstressed reinforcing steel in the web of the described left and right sides, the mid portion of described web presstressed reinforcing steel is arranged on the bottom of described web, and described web presstressed reinforcing steel begins to bend up at described mid portion horizontal segment two ends, bends up to the two ends of beam along described web; Be provided with the baseboard prestress muscle in the described base plate;

Wherein, it is different that the by-level section and the two ends of described web presstressed reinforcing steel bend up segment length, evenly is anchored in the beam-ends of described left and right sides web after the web presstressed reinforcing steel bends up;

Wherein, the angle that bends up of the described web presstressed reinforcing steel section of bending up is 4~12 °;

Wherein, described web presstressed reinforcing steel is set to single pipeline or double pipeline;

Wherein, when described web presstressed reinforcing steel is set to double pipeline, every bundle presstressed reinforcing steel radical adopts 7-7 φ 5~13-7 φ 5, wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 77 φ 5 of 7-7 φ 5 expressions, the steel strand of 13 7 φ 5 of 13-7 φ 5 expressions;

Wherein, when described web presstressed reinforcing steel is set to single pipeline, every bundle presstressed reinforcing steel radical adopts 12-7 φ 5~27-7 φ 5, and wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 12 7 φ 5 of 12-7 φ 5 expressions, the steel strand of 27 7 φ 5 of 27-7 φ 5 expressions may further comprise the steps: exterior sheathing is installed on pedestal, colligation is good cage of reinforcement movement to model, and is installed internal mold and end mould; Concreting once on described pedestal, beam body concrete one-time-concreting is finished; Build at the beam body concrete and to carry out stream curing or natural curing after finishing, the demoulding and prestressing time are determined according to beam body concrete gain in strength situation; Apply prestressing force, prestressing adopts three stage stretching modes, and the stretch-draw of three stages comprises pre-stretch-draw, initial tensioning, whole stretch-draw three phases, and mould stretch-draw promptly is with in pre-stretch-draw after internal mold unclamps, and initial tensioning back rest body can bear deadweight; After applying prestressing force, whole promote or traversing the lifting of described simple supported box beam adopts top board that the mode of hole for hoist is set to depositing the beam pedestal, every end is provided with 4 suspension centres, and near the web setting, the mode that hole for hoist is set at bridge deck is adopted in the lifting of beam body.

Technique scheme only is an optimal technical scheme of the present invention, has following advantage: the section form of simple supported box beam adopts the single box single chamber cross section, and section form is succinct, stressed clear and definite, and construction operation space is big.The beam-ends partition wall adopts the gradual change form, is convenient to the realization of automation internal mold, and stripping rate is fast, and maintenance is convenient.Presstressed reinforcing steel adopts the end, web arrangement of reinforcement scheme respectively.Double pipeline method for arranging adopts less tonnage stretch-draw system, and pipe arrangement is flexible, and construction equipment is selected easy to operate.Single pipeline method for arranging adopts the large-tonnage ground tackle, optimizes the prestress pipe arrangement space, reduces number of tubes, reduces the pipeline cavity effect, the saving end, web engineering quantity; Simplify stretch-draw, mud jacking, each procedure of sealing off and covering anchorage.Manufacture method adopts whole opening prefabricated method of setting up, and prestressing adopts three stage stretching modes, and mould stretch-draw promptly is with in pre-stretch-draw after internal mold unclamps, effectively avoid the generation of early-age shrinkage crackle.The mode that hole for hoist is set at bridge deck is adopted in the lifting of beam body, saves the suspender built-in fitting, reduces construction costs.Fitting operation carries out in case, construction safety, facility.

Description of drawings

Fig. 1 is that 1/2 presstressed reinforcing steel of a kind of simple supported box beam of the embodiment of the invention is vertically arranged schematic diagram;

Fig. 2 is that 1/4 presstressed reinforcing steel of a kind of simple supported box beam of the embodiment of the invention is vertically arranged schematic diagram;

Fig. 3 is the double pipeline presstressed reinforcing steel lateral arrangement schematic diagram of a kind of simple supported box beam of the embodiment of the invention;

Fig. 4 is the single pipeline presstressed reinforcing steel lateral arrangement schematic diagram of a kind of simple supported box beam of the embodiment of the invention.

Wherein, L1: top board; L21, L22: left and right sides web; L23, L24: left and right sides web presstressed reinforcing steel; L3: base plate; L31: base plate span centre presstressed reinforcing steel; L32: bottom end ground tackle.

The specific embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.

Fig. 1 is that 1/2 presstressed reinforcing steel of a kind of simple supported box beam of the embodiment of the invention is vertically arranged schematic diagram, and rightmost side solid line is represented the girder span center line; Fig. 2 is that 1/4 presstressed reinforcing steel of a kind of simple supported box beam of the embodiment of the invention is vertically arranged schematic diagram, and this figure has only shown the position of baseboard prestress muscle, and rightmost side solid line is represented the girder span center line, and the lowermost end solid line is represented beam body center line; Fig. 3 is the double pipeline presstressed reinforcing steel lateral arrangement schematic diagram of a kind of simple supported box beam of the embodiment of the invention, and the dotted line left side is a span centre interface schematic diagram, and the right side is the beam-ends schematic cross-section; Fig. 4 is the single pipeline presstressed reinforcing steel lateral arrangement schematic diagram of a kind of simple supported box beam of the embodiment of the invention, and the dotted line left side is a span centre interface schematic diagram, and the right side is the beam-ends schematic cross-section.

In conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4, simple supported box beam of the present invention comprises top board L1, left and right sides web L21, L22 and base plate L3, and the section form of case beam adopts the single box single chamber cross section of oblique web, big chamfering.The gradient of left and right sides web L21, L22 is between 1: 10~1: 3; The outer chamfer radius of top board L1 and left and right sides web L21, L22 junction is 200~1500mm; The interior chamfering of top board L1 and left and right sides web L21, L22 junction is provided with vertical chamfering; The following chamfer radius of left and right sides web L21, L22 and base plate L3 intersection is 100~300mm.Described case girder span middle section top board, base plate thickness 250~300mm, web thickness 350~500mm; Beam-ends cross section top board, base plate thickness 500~700mm, web thickness 800~1100mm.

Be provided with left and right sides web presstressed reinforcing steel L23, L24 among left and right sides web L21, the L22; The mid portion of described left and right sides web presstressed reinforcing steel L23, L24 is arranged on the bottom of described left and right sides web, and described left and right sides web presstressed reinforcing steel L23, L24 begin to bend up at described mid portion horizontal segment two ends, bend up to the two ends of beam along described left and right sides web; In the described base plate presstressed reinforcing steel is set.

In left and right sides web L21, L22, left and right sides web presstressed reinforcing steel L23, L24 are set to bend up respectively, and it is different that the by-level section and the two ends of presstressed reinforcing steel bend up segment length, evenly is anchored in the beam-ends web after presstressed reinforcing steel bends up.It is 4~12 ° that presstressed reinforcing steel bends up the angle that muscle bends up.Left and right sides web presstressed reinforcing steel L23, L24 arrange and can be set to single pipeline or double pipeline as required.The tonnage of left and right sides web presstressed reinforcing steel L23, L24 is according to arranging the needs selection, when double pipeline is set, can adopt tonnage commonly used, every bundle presstressed reinforcing steel radical can adopt 7-7 φ 5~13-7 φ 5, wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 77 φ 5 of 7-7 φ 5 expressions, the steel strand of 13 7 φ 5 of 13-7 φ 5 expressions; When adopting single pipeline, can adopt than the large-tonnage ground tackle.Every bundle presstressed reinforcing steel radical can adopt 12-7 φ 5~27-7 φ 5, and wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 12 7 φ 5 of 12-7 φ 5 expressions, the steel strand of 27 7 φ 5 of 27-7 φ 5 expressions.

The manufacture method of simple supported box beam adopts whole opening prefabricated method of setting up, and exterior sheathing is installed on pedestal, with colligation is good cage of reinforcement movement to model, and after internal mold and end mould are installed, concreting once on pedestal, beam body concrete one-time-concreting is finished, and integrality performance of the structure is good.Carry out stream curing or natural curing after the placing of beam body concrete is finished, the demoulding and prestressing time are determined according to beam body concrete gain in strength situation.After applying prestressing force, whole lifting or traversing to depositing the beam pedestal.Prestressing adopts three stage stretching modes, and mould stretch-draw promptly is with in pre-stretch-draw after internal mold unclamps, effectively avoid the generation of early-age shrinkage crackle; Initial tensioning back rest body can bear deadweight, can accelerate the pedestal turnover.The hanging method of simple supported box beam adopts top board that the mode of hole for hoist is set, and every end is provided with 4 suspension centres, near the web setting.The mode that hole for hoist is set at bridge deck is adopted in the lifting of beam body, saves the suspender built-in fitting, reduces construction costs.Fitting operation carries out in case, construction safety, facility.

As can be seen from the above embodiments, the form of structure that the simple supported box beam of the embodiment of the invention adopts large-angle inclined web, long radius chamfering and beam-ends cross section to thicken to the inside, stressed simple, clear and definite, form is succinct, the streamline effect is obvious, associative perception is strong, and landscape effect is good.The beam-ends partition wall adopts the gradual change form, is convenient to the realization of automation internal mold, and stripping rate is fast, and maintenance is convenient.The whole hole of single box single chamber simple supported box beam is the cross section of remaining silent, and can provide needed bigger bending resistance of high speed traveling and torsional rigidity, good endurance.The full prestressing structure, under the operation load action, the beam body is in pressured state all the time, and the bridge maintenance workload after building up is little.Adopt whole opening prefabricated technology, compare, can shorten the construction period, reduce interim support expense with cast-in-place beam.Design of section takes into full account and adopts whole hydraulic internal mold and band mould tensioning process, and the construction link sequencing helps improving work efficiency and ensures the quality of products.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (1)

1. the manufacture method of a simple supported box beam, this simple supported box beam comprises top board, left and right sides web and base plate, the cross section of described case beam is the single box single chamber cross section that described left and right sides web adopts oblique web, big chamfering; Be provided with the web presstressed reinforcing steel in the web of the described left and right sides, the mid portion of described web presstressed reinforcing steel is arranged on the bottom of described web, and described web presstressed reinforcing steel begins to bend up at described mid portion horizontal segment two ends, bends up to the two ends of beam along described web; Be provided with the baseboard prestress muscle in the described base plate; Described web presstressed reinforcing steel is set to single pipeline or double pipeline; When described web presstressed reinforcing steel is set to double pipeline, every bundle presstressed reinforcing steel radical adopts 7-7 φ 5~13-7 φ 5, wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 77 φ 5 of 7-7 φ 5 expressions, the steel strand of 13 7 φ 5 of 13-7 φ 5 expressions; When described web presstressed reinforcing steel is set to single pipeline, every bundle presstressed reinforcing steel radical adopts 12-7 φ 5~27-7 φ 5, wherein, φ 5 refers to that diameter is the steel wire of 5mm, the standard steel section twisted wire that 7 φ 5 refer to by 7 φ, 5 steel wire twistings, the steel strand of 12 7 φ 5 of 12-7 φ 5 expressions, the steel strand of 27 7 φ 5 of 27-7 φ 5 expressions; The gradient of described left and right sides web is between 1: 10~1: 3; The outer chamfer radius of described top board and web junction, the described left and right sides is 200~1500mm, and the interior chamfering of described top board and web junction, the described left and right sides is provided with vertical chamfering, and the following chamfer radius of described left and right sides web and described base plate intersection is 100~300mm; Described simple supported box beam spaning middle section top board, base plate thickness 250~300mm, described left and right sides web thickness 350~500mm; Described simple supported box beam end section top board, base plate thickness 500~700mm, described left and right sides web thickness 800~1100mm; It is different that the by-level section and the two ends of described web presstressed reinforcing steel bend up segment length, evenly is anchored in the beam-ends of described left and right sides web after the web presstressed reinforcing steel bends up; The angle that the described web presstressed reinforcing steel section of bending up bends up is 4~12 °, it is characterized in that, may further comprise the steps:
Exterior sheathing is installed on pedestal, colligation is good cage of reinforcement movement to model, and is installed internal mold and end mould;
Concreting once on described pedestal, beam body concrete one-time-concreting is finished;
Build at the beam body concrete and to carry out stream curing or natural curing after finishing, the demoulding and prestressing time are determined according to beam body concrete gain in strength situation;
Apply prestressing force, prestressing adopts three stage stretching modes, and the stretch-draw of three stages comprises pre-stretch-draw, initial tensioning, whole stretch-draw three phases, and mould stretch-draw promptly is with in pre-stretch-draw after internal mold unclamps, and initial tensioning back rest body can bear deadweight;
After applying prestressing force, whole promote or traversing the lifting of described simple supported box beam adopts top board that the mode of hole for hoist is set to depositing the beam pedestal, every end is provided with 4 suspension centres, near the web setting.
CN2008101042326A 2008-04-17 2008-04-17 Method of manufacture for simply supported girder box CN101260644B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2008101042326A CN101260644B (en) 2008-04-17 2008-04-17 Method of manufacture for simply supported girder box

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CN101260644B true CN101260644B (en) 2010-08-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102425110A (en) * 2011-08-31 2012-04-25 重庆新科建设工程有限公司 Cast-in-situ concrete construction method for full section of urban overpass box girder
CN102660920B (en) * 2012-06-07 2013-04-03 河北燕峰路桥建设集团有限公司 Framed large-span combined pre-stress highway bridge and preparation process thereof
CN103046464A (en) * 2012-12-31 2013-04-17 中铁第四勘察设计院集团有限公司 Continuous bridge structure with bridge floor different in width
CN103397599B (en) * 2013-08-14 2015-06-10 中铁大桥局集团有限公司 Structure and method for distribution of multi-unit cast-in-situ box girder end steel bundles
CN105887653B (en) * 2016-04-11 2017-07-04 沈阳建筑大学 A kind of wide box girder bridge girder base arrangement and its construction method
CN106284048A (en) * 2016-08-31 2017-01-04 中冶南方工程技术有限公司 Box beam, prestress concrete box beam bridge and the construction method of this box beam
CN106758576A (en) * 2016-12-22 2017-05-31 中交铁道设计研究总院有限公司 A kind of straddle type single rail prestressed RPC track girder

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