CN103015304A - Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge - Google Patents

Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge Download PDF

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CN103015304A
CN103015304A CN2013100076449A CN201310007644A CN103015304A CN 103015304 A CN103015304 A CN 103015304A CN 2013100076449 A CN2013100076449 A CN 2013100076449A CN 201310007644 A CN201310007644 A CN 201310007644A CN 103015304 A CN103015304 A CN 103015304A
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China
Prior art keywords
built
longeron
base plate
box girder
oblique leg
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CN2013100076449A
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Chinese (zh)
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CN103015304B (en
Inventor
吴国松
胡嘉鸿
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重庆交通大学
重庆国通土木工程技术有限公司
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Priority to CN201310007644.9A priority Critical patent/CN103015304B/en
Publication of CN103015304A publication Critical patent/CN103015304A/en
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Publication of CN103015304B publication Critical patent/CN103015304B/en

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Abstract

The invention discloses a prestressed concrete variable-cross-section box girder bridge with an internal tilted-leg rigid frame. The prestressed concrete variable-cross-section box girder bridge with the internal tilted-leg rigid frame comprises a bottom plate and web plates which form a box girder, a tilted-leg rigid frame structure is arranged in a variable-cross-section box girder bridge box and comprises an internal longitudinal beam and an internal tilted leg, the internal longitudinal beam tilts upwards or is bent along the longitudinal direction of the box girder from the midspan to a pier direction, the internal longitudinal beam and the bottom plate are integrated in a segment from the midspan to the 3L/8 section, the rest portions are separated from one another, a midspan positive-bending-moment bottom plate cable is bent along the internal longitudinal beam, jagged blocks are arranged at bottom plate cable tensioning and anchoring positions of the internal longitudinal beam, the bottom plate cable tensioning and anchoring ends are bent in the box from the jagged block positions, and the bottom plate cable is symmetrically tensioned and anchored on the jagged blocks by the two tensioning and anchoring ends. Down-warping deformation of a girder caused by second-phase dead load is eliminated or reduced by the aid of upward radial force of the bottom plate cable, and the box girder is reasonable in structural bearing. The invention further provides a construction method of the prestressed concrete variable-cross-section box girder bridge with the internal tilted-leg rigid frame.

Description

Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof
Technical field
The present invention relates to civil engineering bridge technology field, more particularly, relate to a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, with and job practices.
Background technology
Stride greatly prestress concrete variable cross-section box girder bridge and be the bridge type that extensively adopts at present, the most common with continuous beam and continuous rigid frame bridge, often adopt the construction of Hanging Basket cast-in-place cantilever method.Fig. 1 is a kind of facade arrangement diagram of striding greatly prestress concrete variable cross-section box girder bridge in the prior art, be continuous rigid frame bridge, the span centre deck-molding is less than the fulcrum deck-molding that is positioned at bridge pier 06 place, the bottom is case beam base plate 01, girder lower edge facade is smooth arch, and bridge adopts the construction of segmentation Hanging Basket cantilever cast in place process.It comprises span centre closure segment 08, end bay closure segment 09, pier top section box girder 011 and end bay Cast-in-Situ Segment 010 and the cast-in-place part of Hanging Basket cantilever, be pier top section box girder 011 and the cast-in-place part of Hanging Basket cantilever between the adjacent span centre closure segment 08 wherein, the bridge two ends are end bay Cast-in-Situ Segment 010.Pier top section box girder 011 adopts pier jacking frame cast-in-place, adopt later on the Hanging Basket cantilever cast-in-place to span centre closure segment 08 and place, end bay closure segment 09 side, end bay Cast-in-Situ Segment 010 is cast-in-place finishing on support, carries out 09 construction of end bay closure segment again, carries out at last the construction of span centre closure segment 08.
Extremely shown in Figure 5 such as Fig. 3, the section form that this variable cross-section box girder bridge of prior art is commonly used at present is the single box single chamber cross section, because longitudinal stress needs, deck-molding is continued to increase to the fulcrum cross section by span centre L/2 cross section, cause base plate 01 lower edge facade to overarch, by span centre to bridge pier 06 place's cantilever root fulcrum direction, case chamber headroom strengthens, deck-molding strengthens, base plate 01 is thickeied gradually, web 02 is also being thickeied the part near the fulcrum cross section, and base plate 01 facade vertically is arch, and base plate 01 arch ratio of rise to span (rise/main span is striden the footpath) is generally about 1/20.The sawtooth piece 03 that is used for anchor foundation plate rope 05 be arranged on web 02 and base plate 01 in conjunction with the corner, with brief power transmission route.Extremely shown in Figure 16 such as Figure 13, the vertical arrangement of its cable wire is in the prior art: top board hogging moment rope horizontal arrangement, be anchored near web 02 place, 07 time curved layout of web rope provides certain shearing resistance component that makes progress, 05 time curved being arranged in the base plate 01 of positive moment of span central point base plate rope, base plate rope 05 is anchored on the sawtooth piece 03,05 time curved layout of base plate rope, base plate rope 05 facade is the arch consistent with base plate 01, and ratio of rise to span (rise/base plate rope is striden the footpath) generally also is about 1/20.Therefore the base plate rope 05 of arch can produce downward radial load when being subjected to pulling force, and anchored end is large away from the downward radial load of the base plate rope 05 of span centre.
When span of bridge increases, prior art is to adopt measures such as increasing deck-molding, thickening base plate 01, thickening web 02, increase configuration base plate rope 05, and increase deck-molding, increase and join rope, the resultant radial force of lower bent bottom plate rope 05 further strengthens, this structure is unreasonable to cause stressed disadvantageous problem, the larger this problem in footpath of striding of bridge is more serious, is restricting the development of such bridge.
Address the above problem to having Figure 12 shows that to have designed a kind of bridge be the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge (patent No.: ZL200610167317.X) such as Fig. 6, Fig. 2 is its facade arrangement diagram, comprise the base plate 01 and the web 02 that consist of the case beam, one oblique leg rigid-frame structure is set in variable cross-section box girder bridge case beam, and the oblique leg rigid-frame structure is comprised of built-in longeron 041 and built-in oblique leg 042; Built-in longeron 041 is located at span centre base plate 01 respective beam high position in the case beam, and section base plate 01 and built-in longeron 041 combine together near span centre L/2 cross section to the 3L/8 cross section, built-in longeron 041 height and span centre base plate 01 consistency of thickness; Built-in oblique leg 042 1 ends and built-in longeron 041 are connected as a single entity, its both sides and web 02 are connected as a single entity, built-in oblique leg 042 and case beam base plate 01 are arranged in parallel, built-in oblique leg 042 and base plate 01 radial distance are 1/4~1/5 of the total deck-molding H of fulcrum, built-in oblique leg 042, case beam base plate 01 and web 02 all adopt uniform section, and thickness is 40~60cm; Line is hanged in the linear employing of case beam base plate 01 lower edge, and clean ratio of rise to span is 1/7~1/9; Positive moment of span central point base plate rope 05 is along built-in longeron 041 horizontal arrangement, built-in longeron 041 in base plate rope 05 stretch-draw anchor position arranges sawtooth piece 03, base plate rope 05 stretch-draw anchor end bends up in the case at sawtooth piece 03 place, and the symmetrical stretch-draw of two anchored end of base plate rope 05 also is anchored on the sawtooth piece 03.
Existing patented technology " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof " (patent No.: ZL200610167317.X) major defect or deficiency show:
(1) base plate rope 05 is arranged and is adopted the bending moment envelope diagram of striding greatly prestress concrete variable cross-section box girder bridge (being generally parabola shaped) of cantilever-construction not fit like a glove, and has certain deviation.
(2) for reducing the high cost of saving of end bay pier, improve the main span under-clearance or overcome the span centre downwarp, two-way 2% left and right sides longitudinal gradient of main span operated by rotary motion, arranging on the bridge of longitudinal gradient, be convenient design and construction, general built-in longeron 041 and bridge floor be arranged in parallel, and base plate rope 05 is arranged on two-way 2% left and right sides longitudinal gradient, and there is the downward radial load of part in base plate rope 05.
(3) can not provide component upwards, can not balance second phase dead load and the downward active force of lane load.
(4) do not provide and eliminate or reduce the control method that the second stage of dead load causes the girder bending-down distortion, it is wayward that main span is closed up rear distortion.
(5) arrange on the bridge of two-way longitudinal gradient in main span, downward radial load, first phase and the second stage of dead load, the lane load of base plate rope 05 is all downward, and aggravation concrete shrinkage and creep effect causes span centre operation certain lasting downwarp of phase.
(6) built-in oblique leg 042 and case beam base plate 01 are arranged in parallel, built-in oblique leg 042 and base plate 01 radial distance are 1/4~1/5 of the total deck-molding H of fulcrum, the built-in longeron 041 of Large Span Bridges and built-in oblique leg 042 spacing are excessive, surpass 5 to 6 meters, and web 02 stability and case beam anti-twisting property are not good enough.
In addition, prior art adopts the follow-up construction working of striding greatly after the prestress concrete variable cross-section box girder bridge girder closes up of cantilever-construction that following characteristics is arranged:
After closing up, the case beam that prior art is striden greatly prestress concrete variable cross-section box girder bridge carries out the cast-in-place leveling concrete construction in thick 10 centimetres of left and right sides, thick 10 centimetres of left and right sides asphalt concrete pavement constructions, sidewalk, railing or anticollision barrier construction.
The cast-in-place leveling concrete in thick 10 centimetres of left and right sides, thick 10 centimetres of left and right sides asphalt concrete pavements, sidewalk, railing or anticollision barrier weight are commonly referred to as the second stage of dead load.Dead load construction stage second phase, the 05 general stretch-draw of base plate rope is finished.The second phase dead load generally adopts concrete material, and the Partial Bridges railing adopts steel work, and is larger from weight average.
Following table has been listed the proportionate relationship of the second stage of dead load and Road Design lane load.The second phase dead load is generally about 2 times of Road Design lane load, eliminate or reduce impact that the second stage of dead load causes the girder bending-down distortion to improve the traffic capacity, to reduce the construction control difficulty significant.
Summary of the invention
Defective and deficiency for prior art, first purpose of the present invention is to provide a kind of positive moment of span central point base plate rope to produce radial load upwards, eliminate or reduce the impact that the second stage of dead load causes the girder bending-down distortion, and structural entity rigidity is large, amount of deflection is little, shear resistance is strong, the cloth rope reasonable, Web Stability and case beam anti-twisting property is good, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of box girder structure reasonable stress, easy construction.Second purpose of the present invention also is to provide a kind of job practices of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge.
In order to reach above-mentioned first purpose, the invention provides following technical scheme:
A kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate and the web that consist of the case beam, be provided with an oblique leg rigid-frame structure in the variable cross-section box girder bridge case, described oblique leg rigid-frame structure comprises built-in longeron and built-in oblique leg, described built-in longeron vertically is inclined upwardly to the bridge pier direction along the case beam by span centre or bends up setting, at span centre L/2 cross section to 3L/8 cross section section, described built-in longeron and base plate combine together, and the built-in longeron of remainder separates with base plate;
Described built-in oblique leg one end is connected with described built-in longeron, the other end is connected with described bridge pier, its end that is connected with built-in longeron is higher than an end that is connected with bridge pier, and the cross section of the end that described built-in oblique leg is connected with bridge pier is positioned at the centre of deck-molding between described built-in longeron and base section and is connected with the diaphragm of bridge pier, and described built-in oblique leg is connected with described built-in longeron in the middle part of L/4 section case depth of beam;
Positive moment of span central point base plate rope is along curved layout on the built-in longeron, be provided with the sawtooth piece on the above base plate cable stretching anchorage point of described built-in longeron, base plate cable stretching anchored end bends up in the case at sawtooth piece place, and the base plate rope is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on the sawtooth piece.
Preferably, described built-in longeron is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section that separates with described base plate is inclined upwardly and is arranged to skew lines or curve, when described segregation section is curved when being inclined upwardly, its anchor point is positioned on the same skew lines, the upwards component that the inclination ratio of slope of curved inclination provides by described base plate rope on the described base plate rope can be offset the case beam and be closed up 10 centimetres of cast-in-place leveling Concrete Thick of later stage, thick 10 centimetres of asphalt concrete pavement, the sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculative determination, and are provided with curve transition between the horizontal arrangement section of described built-in longeron and the upper curved segregation section.
Preferably, described built-in longeron is near last sawtooth piece place horizontal arrangement of bridge pier side, and extend to the bridge pier place, built-in oblique leg is provided with pier top horizontal segment at the bridge pier place, built-in longeron and built-in oblique leg all pass pier top diaphragm and are connected as a single entity with adjacent built-in longeron and built-in oblique leg of striding respectively, between the pier top horizontal segment of built-in longeron and spanning inclination or upper bend section curve transition are set.
Preferably, the surface of the main span part of described built-in longeron is the spill parabolic surface to lower recess, the upper face of described built-in longeron raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of described bridge pier, and the construct base plate of horizontal segment of sections of described built-in longeron bottom and span centre closure segment combines together.
Preferably, the transverse structure reinforcing bar of described built-in longeron and built-in oblique leg bends up at the web place also and the vertical reinforced-bar-welding of described web is firm or overlap joint, when adopting overlap joint, the transverse structure reinforcing bar of described built-in longeron and built-in oblique leg bends up at the web place, and guarantees that the anchorage length in web is more than 40 times of bar diameter.
Preferably, the together horizontal ribs of each the construction section setting on the built-in longeron of base plate rope layout section.
Preferably, be applied with transverse prestress on the described horizontal ribs, transverse prestress can adopt two ends stretch-draw outside case, or adopt an end to be anchored in the web place concrete, the other end bends up stretch-draw in the case, and the transverse prestress construction that laterally applies on the ribs will be early than the stretching construction of vertical base plate rope.
A kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge job practices, bridge adopts the construction of Hanging Basket cast-in-place cantilever method, cantilever is cast-in-place together for built-in longeron, built-in oblique leg and box girder segment during construction, or built-in longeron and built-in oblique leg construction stage of postponement, cast-in-place on case inner support or suspension bracket.
Preferably, the stretch-draw of base plate rope divides many batches to construct stage by stage according to the variation of span centre absolute altitude; The case beam closes up post tensioning 40%, and 10 centimetres of cast-in-place leveling Concrete Thick of later stage are finished post tensioning 20%, and sidewalk, railing or anticollision barrier are finished post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 20%; When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 30%; Measure absolute altitude according to spaning middle section during construction and carry out the dynamic adjustment of upper bent bottom plate cable stretching process.
With existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof " (patent No.: ZL200610167317.X) with existing base plate rope under curved layout stride greatly prestressed concrete single box single chamber box girder with variable cross section bridge construction and compare, the main beneficial effect of the present invention is:
(1) owing to is provided with curved built-in longeron, and the base plate rope is arranged in the curved built-in longeron, so that positive moment of span central point base plate rope of the present invention is upper curved layout, arrange on the road at various longitudinal gradients, by different upper curved ratios of slope is set, eliminated the downward radial load of curved layout single box single chamber variable cross-section box girder bridge technology positive moment of span central point rope under the existing base plate rope fully, eliminated main span fully existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof the " (patent No.: ZL200610167317.X) the downward radial load of base plate rope of two-way longitudinal gradient has been set, solved and striden greatly the downward radial load of footpath variable cross-section box girder bridge positive moment of span central point rope with the difficult problem of striding the footpath and continuing to increase, can effectively solve suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load is prone to the crack, the principal tensile stress crack problem that the downwarp that span centre generally occurs and web are prone to.
(2) with existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof the " (patent No.: ZL200610167317.X) compare with curved layout single box single chamber variable cross-section box girder bridge under the prior art base plate rope, the invention provides and eliminate or reduce the method that the second stage of dead load and lane load cause the girder bending-down distortion.But the second phase of radial load balance upwards dead load and lane load effect, to improve the carrying traffic capacity, to reduce the construction control difficulty significant.
(3) base plate rope of the present invention is arranged in the curved built-in longeron, base plate rope facade forms spill parabola, substantially identical with the bending moment envelope diagram of striding greatly prestress concrete variable cross-section box girder bridge that adopts cantilever-construction, the larger positive bending moment in span centre L/2 cross section to 3L/8 cross section can be overcome, near the L/8 cross section, the part hogging moment can be resisted.Than (the patent No.: ZL200610167317.X) Bu Suo and stressed all more reasonable of curved layout single box single chamber variable cross-section box girder bridge and existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof " under the prior art base plate rope, save material, thus the economy of bringing.
(4) the below bridge pier root section of built-in oblique leg is positioned at the middle part of deck-molding between built-in longeron and base section, is arranged in parallel with built-in oblique leg and base plate and compares the stability of having improved web.
(5) on the bridge of various longitudinal gradients, the radial load that the base plate rope makes progress and first phase and the second stage of dead load and lane load are contrary, and can improve the concrete shrinkage and creep effect, overcome the span centre lasting downwarp of operation phase.
(6) bridge of the present invention can adopt the construction of prior art cast-in-place cantilever method, built-in longeron and built-in oblique leg can be cast-in-place with box girder segment together cantilever during construction, for alleviating Hanging Basket cantilever pouring weight, it is cast-in-place on case inner support or suspension bracket that built-in longeron and built-in oblique leg also can be postponed a construction stage, and construction is easy to control.
(7) stretch-draw of base plate rope divides many batches of multistages to construct according to the variation zone of reasonableness of span centre absolute altitude, can realize that the main span first phase closes up after, the target that the bridge absolute altitude is substantially constant, the construction be easy to control.
(8) the transverse prestress construction that applies on the horizontal ribs of built-in longeron will guarantee that base plate does not produce longitudinal cracking early than the stretching construction of vertical base plate rope.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of striding greatly prestress concrete variable cross-section box girder bridge in the prior art;
Fig. 2 is the structural representation of existing patent built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge;
Fig. 3 is that prior art is striden greatly the prestress concrete variable cross-section box girder bridge constructional drawing;
Fig. 4 is the B-B sectional view of Fig. 3;
Fig. 5 is the A-A sectional view of Fig. 3;
Fig. 6 is the constructional drawing of existing patent built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge;
Fig. 7 is the A-A sectional view of Fig. 6;
Fig. 8 is the B-B sectional view of Fig. 6;
Fig. 9 is the C-C sectional view of Fig. 6;
Figure 10 is the D-D sectional view of Fig. 6;
Figure 11 is the E-E sectional view of Fig. 6;
Figure 12 is the F-F sectional view of Fig. 6;
Figure 13 is the vertical arrangement diagram of cable wire that prior art is striden greatly prestress concrete variable cross-section box girder bridge;
Figure 14 is the A-A sectional view of Figure 13;
Figure 15 is the B-B sectional view of Figure 13;
Figure 16 is the C-C sectional view of Figure 13;
Figure 17 is the vertical arrangement diagram of cable wire of existing patent built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge;
Figure 18 is the A-A sectional view of Figure 17;
Figure 19 is the B-B sectional view of Figure 17;
Figure 20 is the C-C sectional view of Figure 17;
Figure 21 is the constructional drawing of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of the present invention;
Figure 22 is the D-D sectional view of Figure 21;
Figure 23 is the E-E sectional view of Figure 21;
Figure 24 is the F-F sectional view of Figure 21;
Figure 25 is the A-A sectional view of Figure 21;
Figure 26 is the B-B sectional view of Figure 21;
Figure 27 is the sectional view of the C-C of Figure 21;
Figure 28 is the vertical arrangement diagram of the cable wire of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of the present invention;
Figure 29 is the A-A sectional view of Figure 28;
Figure 30 is the B-B sectional view of Figure 28;
Figure 31 is the C-C sectional view of Figure 28.
Mark is as follows among accompanying drawing 1-Figure 22:
01-base plate, 02-web, 03-sawtooth piece, the built-in longeron of 041-, 042-built-in oblique leg, 05-base plate rope, 06-bridge pier, 07-web rope, 08-span centre closure segment, 09-end bay closure segment, 010-end bay Cast-in-Situ Segment, 011-pier top section box girder;
Mark is as follows among accompanying drawing 23-Figure 31:
1-base plate, 2-web, 3-sawtooth piece, the built-in longeron of 41-, 42-built-in oblique leg, 5-base plate rope, 6-bridge pier.
The specific embodiment
First purpose of the present invention is to provide a kind of positive moment of span central point base plate rope to produce radial load upwards, eliminate or reduce the impact that the second stage of dead load causes the girder bending-down distortion, and structural entity rigidity is large, amount of deflection is little, shear resistance is strong, the cloth rope reasonable, web 2 stability and case beam anti-twisting property is good, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of box girder structure reasonable stress, easy construction.Second purpose of the present invention also is to provide a kind of job practices of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
See also Figure 21-31, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge that the embodiment of the invention provides, the base plate 1, the web 2 that comprise bridge pier 6 and formation case beam, be provided with an oblique leg rigid-frame structure in the variable cross-section box girder bridge case, described oblique leg rigid-frame structure comprises built-in longeron 41 and built-in oblique leg 42.
Wherein built-in longeron 41 vertically is inclined upwardly to bridge pier 6 directions along the case beam by span centre or bends up setting, at span centre L/2 cross section to 3L/8 cross section section, described built-in longeron 41 and base plate 1 combine together, are entity section, and the built-in longeron 41 of remainder separates with base plate 1; Built-in oblique leg 42 1 ends are connected with built-in longeron 41, the other end is connected with bridge pier 6, its end that is connected with built-in longeron 41 is higher than an end that is connected with bridge pier 6, and the cross section of the end that built-in oblique leg 42 is connected with bridge pier 6 is positioned at described built-in longeron 41 and is connected with the centre of base plate 1 interval deck-molding and with the diaphragm of bridge pier 6, built-in oblique leg 42 is connected with described built-in cant beam in the middle part of L/4 section case depth of beam, preferably built-in oblique leg 42, case beam base plate 1 and web 2 all adopt uniform section, and thickness is about 60cm.The linear employing semi-cubical parabola of case beam base plate 1 lower edge, clean ratio of rise to span (discrepancy in elevation/stride directly) is about 1/20.
Positive moment of span central point base plate rope 5 is along curved layout on the built-in longeron 41, built-in longeron 41 upper plate ropes are provided with sawtooth piece 3 on the 5 stretch-draw anchor positions, base plate rope 5 stretch-draw anchor ends bend up in the case at sawtooth piece 3 places, and base plate rope 5 is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on the sawtooth piece 3.The top of built-in oblique leg 42 and built-in longeron 41 are connected, and 41 liang of sides of built-in oblique leg 42 and built-in longeron are connected respectively the Special composition body structure with web 2.
Owing to be provided with curved built-in longeron 41, and base plate rope 5 is arranged in the curved built-in longeron 41, so that positive moment of span central point base plate rope 5 of the present invention is upper curved layouts, arrange on the road at various longitudinal gradients, by different upper curved ratios of slope is set, eliminated the downward radial load of curved layout single box single chamber variable cross-section box girder bridge technology positive moment of span central point rope under the existing base plate rope, eliminated main span existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and job practices thereof the " (patent No.: ZL200610167317.X) the downward radial load of base plate rope of two-way longitudinal gradient has been set, solved and striden greatly the downward radial load of footpath variable cross-section box girder bridge positive moment of span central point rope with the difficult problem of striding the footpath and continuing to increase, can effectively solve suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load is prone to the crack, the principal tensile stress crack problem that the downwarp that span centre generally occurs and web are prone to.
Preferably, in this specific embodiment, built-in longeron vertically is inclined upwardly or bends up setting along the case beam by 5% ratio of slope to the bridge pier direction by span centre.Certainly, also can according to different bridges, adopt different inclination ratios of slope.
Preferably, built-in longeron 41 is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section that separates with base plate 1 is inclined upwardly and is arranged to skew lines or curve, when segregation section is curved when being inclined upwardly, its anchor point is positioned on the same skew lines, the upwards component that the inclination ratio of slope of the upper curved inclination of base plate rope 5 provides by described base plate rope 5 can be offset the case beam and be closed up 10 centimetres of cast-in-place leveling Concrete Thick of later stage, thick 10 centimetres of asphalt concrete pavement, the sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculative determination, and are provided with curve transition between the horizontal arrangement section of described built-in longeron 41 and the upper curved segregation section.
Preferably, the surface of the main span part of built-in longeron 41 is the spill parabolic surface to lower recess, the upper face of built-in longeron 41 raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of bridge pier, and the construct horizontal segment base plate of sections of built-in longeron 41 bottoms and span centre closure segment combines together.Be that the segregation section that built-in longeron 41 separates with base plate 1 can be spill parabola, the position that is connected with the bridge pier top is pier top horizontal segment, and the pier top horizontal segment at the position that is connected with the bridge pier top is connected with the spill parabolic segment by the convex parabolic segment.
Wherein the transverse structure reinforcing bar of built-in longeron 41 and built-in oblique leg 42 bend up at web 2 places and and the vertical reinforced-bar-welding of web 2 firmly or overlap, when adopting overlap joint, the transverse structure reinforcing bar of built-in longeron 41 and built-in oblique leg 42 bends up at web 2 places, and guarantees that the anchorage length in web 2 is more than 40 times of bar diameter.Can arrange on the built-in longeron 41 of sections together horizontal ribs of each construction section setting at base plate rope 5 in case of necessity.Laterally can be applied with transverse prestress on the ribs in case of necessity, transverse prestress can adopt two ends stretch-draw outside case, or adopt an end to be anchored in web 2 place's concrete, the other end bends up stretch-draw in the case, and the transverse prestress construction that laterally applies on the ribs will be early than the stretching construction of vertical base plate rope 5.
The present invention also provides a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge job practices, bridge adopts the construction of Hanging Basket cast-in-place cantilever method, cantilever is cast-in-place together for built-in longeron 41 and built-in oblique leg 42 and box girder segment during construction, or built-in longeron 41 and 42 construction stages of postponement of built-in oblique leg, cast-in-place on case inner support or suspension bracket.
Wherein, the stretch-draw of base plate rope 5 divides many batches to construct stage by stage according to the variation of span centre absolute altitude; The case beam closes up post tensioning 40%, and 10 centimetres of cast-in-place leveling Concrete Thick of later stage are finished post tensioning 20%, and sidewalk, railing or anticollision barrier are finished post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 20%; When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 30%; Measure absolute altitude according to spaning middle section during construction and carry out the dynamic adjustment of upper bent bottom plate rope 5 stretching processes.
Each embodiment adopts the mode of going forward one by one to describe in this manual, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Need to prove, a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and the job practices thereof that provide in this specific embodiment, be applicable to 150 to 200 meters wide bridges of various longitudinal gradient main spans (4 to 6 track), certainly, also be not precluded within beam bridge and the job practices that adopts when carrying out other forms of beam bridge design in this specific embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (9)

1. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate (1) and the web (2) that consist of the case beam, it is characterized in that, be provided with an oblique leg rigid-frame structure in the variable cross-section box girder bridge case, described oblique leg rigid-frame structure comprises built-in longeron (41) and built-in oblique leg (42), described built-in longeron (41) vertically is inclined upwardly to bridge pier (6) direction along the case beam by span centre or bends up setting, at span centre L/2 cross section to 3L/8 cross section section, described built-in longeron (41) and base plate (1) combine together, and the built-in longeron of remainder (41) separates with base plate (1);
Described built-in oblique leg (42) one ends are connected with described built-in longeron (41), the other end is connected with described bridge pier (6), its end that is connected with built-in longeron (41) is higher than an end that is connected with bridge pier (6), and the cross section of the end that described built-in oblique leg (42) is connected with bridge pier (6) is positioned at described built-in longeron (41) and is connected with the centre of the interval deck-molding of base plate (1) and with the diaphragm of bridge pier (6), and described built-in oblique leg (42) is connected with described built-in longeron (41) in the middle part of L/4 section case depth of beam;
Positive moment of span central point base plate rope (5) is along the upper curved layout of built-in longeron (41), described built-in longeron (41) is provided with sawtooth piece (3) on the above base plate rope (5) stretch-draw anchor position, base plate rope (5) stretch-draw anchor end is located to bend up in the case at sawtooth piece (3), and base plate rope (5) is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on the sawtooth piece (3).
2. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, described built-in longeron (41) is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section that separates with described base plate (1) is inclined upwardly and is arranged to skew lines or curve, when described segregation section is curved when being inclined upwardly, its anchor point is positioned on the same skew lines, the component that makes progress that the inclination ratio of slope of the upper curved inclination of described base plate rope (5) provides by described base plate rope (5) can be offset the case beam and be closed up 10 centimetres of cast-in-place leveling Concrete Thick of later stage, thick 10 centimetres of asphalt concrete pavement, the sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculative determination, and are provided with curve transition between the horizontal arrangement section of described built-in longeron (41) and the upper curved segregation section.
3. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, described built-in longeron (41) is located horizontal arrangement near last sawtooth piece (3) of bridge pier (6) side, and extend to bridge pier (6) and locate, built-in oblique leg (42) is provided with pier top horizontal segment at the bridge pier place, built-in longeron (41) and built-in oblique leg (42) all pass pier top diaphragm and are connected as a single entity with adjacent built-in longeron (41) of striding and built-in oblique leg (42) respectively, between the pier top horizontal segment of built-in longeron (41) and spanning inclination or upper bend section curve transition are set.
4. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, the surface of the main span part of described built-in longeron (41) is the spill parabolic surface to lower recess, the upper face of described built-in longeron (41) raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of described bridge pier, and the construct base plate (1) of horizontal segment of sections of described built-in longeron (41) bottom and span centre closure segment combines together.
5. described built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1-4, it is characterized in that, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) web (2) locate to bend up and and the vertical reinforced-bar-welding of described web (2) firmly or overlap joint, when adopting overlap joint, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) is located to bend up at web (2), and guarantees that the anchorage length in web (2) is more than 40 times of bar diameter.
6. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 5 is characterized in that, the together horizontal ribs of each the construction section setting on the built-in longeron (41) of base plate rope (5) layout section.
7. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 6, it is characterized in that, be applied with transverse prestress on the described horizontal ribs, transverse prestress can adopt two ends stretch-draw outside case, or adopt an end to be anchored at web (2) and locate in the concrete, the other end bends up stretch-draw in the case, and the transverse prestress construction that laterally applies on the ribs will be early than the stretching construction of vertical base plate rope (5).
8. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge job practices, it is characterized in that, bridge adopts the construction of Hanging Basket cast-in-place cantilever method, cantilever is cast-in-place together for built-in longeron (41), built-in oblique leg (42) and box girder segment during construction, or built-in longeron (41) and built-in oblique leg (42) construction stage of postponement, cast-in-place on case inner support or suspension bracket.
9. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge job practices according to claim 8 is characterized in that, the stretch-draw of base plate rope (5) divides many batches to construct stage by stage according to the variation of span centre absolute altitude; The case beam closes up post tensioning 40%, and 10 centimetres of cast-in-place leveling Concrete Thick of later stage are finished post tensioning 20%, and sidewalk, railing or anticollision barrier are finished post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 20%; When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement is finished post tensioning 30%; Measure absolute altitude according to spaning middle section during construction and carry out the dynamic adjustment of upper bent bottom plate rope (5) stretching process.
CN201310007644.9A 2013-01-09 2013-01-09 Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge CN103015304B (en)

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