CN103015304B - 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 PDFInfo
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- CN103015304B CN103015304B CN201310007644.9A CN201310007644A CN103015304B CN 103015304 B CN103015304 B CN 103015304B CN 201310007644 A CN201310007644 A CN 201310007644A CN 103015304 B CN103015304 B CN 103015304B
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 239000011513 prestressed concrete Substances 0.000 title abstract description 6
- 239000002965 rope Substances 0.000 claims description 76
- 239000004567 concrete Substances 0.000 claims description 57
- 241001646071 Prioneris Species 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 12
- 239000011384 asphalt concrete Substances 0.000 claims description 11
- 210000000614 Ribs Anatomy 0.000 claims description 10
- 238000005204 segregation Methods 0.000 claims description 10
- 230000003014 reinforcing Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 230000003750 conditioning Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 230000002045 lasting Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
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, and its construction method.
Background technology
Greatly the bridge type extensively adopted at present across prestress concrete variable cross-section box girder bridge, with continuous beam and continuous rigid frame bridge the most common, often adopt Hanging Basket case-in-place cantilever method.Fig. 1 is a kind of greatly across the facade arrangement diagram of prestress concrete variable cross-section box girder bridge in prior art, for continuous rigid frame bridge, span centre deck-molding is less than the fulcrum deck-molding being positioned at bridge pier 06 place, 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 wherein adjacent span centre closure segment 08, bridge two ends are end bay Cast-in-Situ Segment 010.Pier top section box girder 011 adopts pier top cast-in-site of bracket, later employing Hanging Basket cantilever is cast-in-place to span centre closure segment 08 and end bay closure segment 09 side place, end bay Cast-in-Situ Segment 010 is cast-in-place on support to be completed, then carries out end bay closure segment 09 and construct, and finally carries out the construction of span centre closure segment 08.
As shown in Figures 3 to 5, the section form that this variable cross-section box girder bridge of prior art is commonly used at present is single box single chamber cross section, because longitudinal stress needs, deck-molding is continued to increase to fulcrum cross section by span centre L/2 cross section, base plate 01 lower edge facade is caused to overarch, by span centre to bridge pier 06 cantilever root fulcrum direction, case room headroom strengthens, deck-molding strengthens, base plate 01 thickeies gradually, web 02 is in the also local thickening near fulcrum cross section, and base plate 01 facade is longitudinally arch, and base plate 01 arch ratio of rise to span (rise/main span is across footpath) is generally about 1/20.Sawtooth block 03 for anchor foundation plate rope 05 be arranged on web 02 and base plate 01 in conjunction with corner, with brief load path.As shown in Figure 13 to Figure 16, in prior art, the longitudinal arrangement of its cable wire is: top board hogging moment rope horizontal arrangement, be anchored near web 02 place, web rope 07 time curved layout provides certain shearing resistance component upwards, positive moment of span central point base plate rope 05 time is curved to be arranged in base plate 01, and base plate rope 05 is anchored on sawtooth block 03, base plate rope 05 time curved layout, base plate rope 05 facade is the arch consistent with base plate 01, and ratio of rise to span (rise/base plate rope is across footpath) is also generally about 1/20.Therefore the base plate rope 05 of arch can produce downward radial load when being subject to pulling force, and anchored end is large away from the radial load that the base plate rope 05 of span centre is downward.
When span of bridge increases, prior art adopts measures such as increasing deck-molding, thickening base plate 01, thickening web 02, increase configuration base plate rope 05, and increase deck-molding, increase join rope, the resultant radial force of lower bent bottom plate rope 05 strengthens further, this structure is unreasonable causes stressed disadvantageous problem, bridge more serious across the larger this problem in footpath, governs the development of such bridge.
As Fig. 6 devises a kind of bridge and built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge (patent No.: ZL 200610167317.X) to having Figure 12 shows that to solve the problem, Fig. 2 is its facade arrangement diagram, comprise the base plate 01 and web 02 that form case beam, in variable cross-section box girder bridge case beam, arrange an oblique leg rigid-frame structure, oblique leg rigid-frame structure is made up 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 case beam, and near span centre L/2 cross section to 3L/8 cross section, section base plate 01 and built-in longeron 041 combine together, built-in longeron 041 height and span centre base plate 01 consistency of thickness; Built-in oblique leg 042 one end 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, the built-in longeron 041 of base plate rope 05 stretch-draw anchor position arranges sawtooth block 03, base plate rope 05 stretch-draw anchor end bends up in case at sawtooth block 03 place, and the symmetrical stretch-draw of two anchored end of base plate rope 05 are also anchored on sawtooth block 03.
Major defect or the deficiency of existing patented technology " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X) show:
(1) base plate rope 05 is arranged and is adopted the large bending moment envelope diagram across prestress concrete variable cross-section box girder bridge (being generally parabola shaped) of cantilever-construction not fit like a glove, and there is certain deviation.
(2) cost is saved for reducing end bay pier height, improve main span under-clearance or overcome middle span deflexion, main span generally arranges two-way about 2% longitudinal gradient, on the bridge that longitudinal gradient is set, for convenience of 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 about 2% longitudinal gradient, and base plate rope 05 exists the downward radial load of part.
(3) component upwards can not be provided, secondary dead load and the downward active force of lane load can not be balanced.
(4) do not provide the control method eliminated or reduce secondary dead load and cause girder bending-down to be out of shape, it is wayward that main span closes up rear distortion.
(5) arrange in main span on the bridge of two-way longitudinal gradient, downward radial load, first phase and the secondary dead load of base plate rope 05, lane load are all downward, aggravation concrete shrinkage and creep effect, cause span centre to run phase certain lasting downwarp.
(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 of Large Span Bridges 041 and built-in oblique leg 042 spacing excessive, more than 5 to 6 meters, web 02 stability and case beam anti-twisting property not good enough.
In addition, prior art adopts the large of cantilever-construction to have following characteristics across the subsequent construction work after prestress concrete variable cross-section box girder bridge girder closes up:
Prior art carries out thick 10 cm cast-in-place leveling concrete construction, thick 10 cm asphalt concrete pavement constructions, sidewalk, railing or anticollision barrier construction after closing up across the case beam of prestress concrete variable cross-section box girder bridge greatly.
Thick 10 cm cast-in-place leveling concrete, thick 10 cm asphalt concrete pavements, sidewalk, railing or anticollision barrier weight are commonly referred to as secondary dead load.The secondary dead load construction stage, the general stretch-draw of base plate rope 05 completes.Secondary dead load generally adopts concrete material, and Partial Bridges railing adopts steel work, larger from weight average.
Following table lists the proportionate relationship of secondary dead load and Road Design lane load.Secondary dead load is generally about 2 times of Road Design lane load, and the impact that elimination or reduction secondary dead load cause girder bending-down to be out of shape is significant to the raising traffic capacity, reduction construction control difficulty.
Summary of the invention
For defect and the deficiency of prior art, first object of the present invention is to provide a kind of positive moment of span central point base plate rope to produce radial load upwards, elimination or reduces the impact that secondary dead load causes girder bending-down be out of shape, structural entity rigidity is large, amount of deflection is little, shear resistance is strong, cloth rope reasonable, Web Stability and case beam anti-twisting property is good, box girder structure reasonable stress, easy construction built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge.Second object of the present invention is also the construction method providing a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge.
In order to reach above-mentioned first object, 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 web that form case beam, an oblique leg rigid-frame structure is provided with in 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 to bridge pier direction along case beam by span centre is longitudinally inclined upwardly 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 is separated 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 one end be connected with built-in longeron is higher than the one end be connected with bridge pier, and the cross section of one end that described built-in oblique leg is connected with bridge pier is positioned at the centre of described built-in longeron and deck-molding between base section and is connected with the diaphragm of bridge pier, 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 layout curved on built-in longeron, described base plate cable stretching anchorage point is provided with sawtooth block to described built-in longeron, base plate cable stretching anchored end bends up in case at sawtooth block place, and base plate rope is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on sawtooth block.
Preferably, described built-in longeron is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section be separated with described base plate is inclined upwardly and is arranged to skew lines or curve, when described segregation section is curved be inclined upwardly time, its anchor point is positioned on same skew lines, the inclination ratio of slope of curved inclination on described base plate rope can be offset case beam by the upwards component that described base plate rope provides and be closed up later stage cast-in-place leveling Concrete Thick 10 centimetres, thick 10 centimetres of asphalt concrete pavement, sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculating to determine, and be provided with curve transition between the horizontal arrangement section of described built-in longeron and upper curved segregation section.
Preferably, described built-in longeron is near last sawtooth block place horizontal arrangement of bridge pier side, and extend to bridge pier place, built-in oblique leg is provided with pier top horizontal segment at bridge pier place, built-in longeron and built-in oblique leg all through pier top diaphragm respectively with adjacent across built-in longeron and built-in oblique leg be connected as a single entity, the pier top horizontal segment of built-in longeron and spanning tilt or arrange curve transition between upper bend section.
Preferably, the surface of the main span part of described built-in longeron is concave parabola shape surface to lower recess, the upper face of described built-in longeron raises up and arranges the surface in convex parabola shape and be connected 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 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 web place, and the anchorage length ensureing in web is more than 40 times of bar diameter.
Preferably, arrange at base plate rope that each construction section on the built-in longeron of section arranges horizontal ribs together.
Preferably, described horizontal ribs is applied with transverse prestress, transverse prestress can adopt in the outer two ends stretch-draw of case, or adopt one end to be anchored in web place concrete, the other end bends up stretch-draw in case, and the transverse prestress construction that horizontal ribs applies will early than the stretching construction of longitudinal base plate rope.
A kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge construction method, bridge adopts Hanging Basket case-in-place cantilever method, during construction, built-in longeron, built-in oblique leg cantilever together with box girder segment is cast-in-place, or built-in longeron and built-in oblique leg postpone a construction stage, 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 change of span centre absolute altitude; Case beam closes up post tensioning 40%, and later stage cast-in-place leveling Concrete Thick 10 centimetres completes post tensioning 20%, and sidewalk, railing or anticollision barrier complete post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 20%; When not arranging leveling concrete, case beam closes up post tensioning 40%, and sidewalk, railing or anticollision barrier complete post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 30%; Measure according to spaning middle section the dynamic conditioning that absolute altitude carries out upper bent bottom plate cable stretching process during construction.
Compare across prestressed concrete single box single chamber box girder with variable cross section bridge construction greatly with curved layout under existing base plate rope with existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X), the main beneficial effect of the present invention is:
(1) owing to being provided with upper curved built-in longeron, and base plate rope is arranged in curved built-in longeron, positive moment of span central point base plate rope of the present invention is made to be upper curved layout, arrange on road at various longitudinal gradient, by arranging different upper curved ratios of slope, the radial load that under completely eliminating existing base plate rope, curved layout single box single chamber variable cross-section box girder bridge technology positive moment of span central point rope is downward, completely eliminate main span and the downward radial load of the existing patent of two-way longitudinal gradient " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X) base plate rope is set, solve the downward radial load of Long span variable cross-section box girder bridge positive moment of span central point rope with the difficult problem continued to increase across footpath, effectively can solve suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load easily occurs to crack, the downwarp that span centre generally occurs and the principal tensile stress crack problem that web easily occurs.
(2) compare with curved layout single box single chamber variable cross-section box girder bridge under prior art base plate rope with existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X), the invention provides the method that elimination or reduction secondary dead load and lane load cause girder bending-down to be out of shape.Radial load upwards can balance secondary dead load and lane load effect, carries the traffic capacity, reduction construction control difficulty is significant to raising.
(3) base plate rope of the present invention is arranged in curved built-in longeron, base plate rope facade forms concave parabola, the large bending moment envelope diagram across prestress concrete variable cross-section box girder bridge of cantilever-construction is substantially identical with adopting, the positive bending moment that span centre L/2 cross section to 3L/8 cross section is larger can be overcome, part hogging moment can be resisted near L/8 cross section.Than layout single box single chamber variable cross-section box girder bridge curved under prior art base plate rope and existing patent " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X) Bu Suo and stressed all more reasonable, save material, thus bring economy.
(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, improves the stability of web compared with built-in oblique leg is arranged in parallel with base plate.
(5) on the bridge of various longitudinal gradient, base plate rope radial load upwards and first phase and secondary dead load and lane load are contrary, and can improve concrete shrinkage and creep effect, overcome the lasting downwarp of span centre operation phase.
(6) bridge of the present invention can adopt prior art case-in-place cantilever method, during construction built-in longeron and built-in oblique leg can together with box girder segment cantilever cast-in-place, 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 postpone 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 change zone of reasonableness of span centre absolute altitude, and can realize after main span first phase closes up, the target that bridge absolute altitude is substantially constant, construction is easy to control.
(8) early than the stretching construction of longitudinal base plate rope, the transverse prestress construction horizontal ribs of built-in longeron applied will ensure that base plate does not produce longitudinal cracking.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation greatly across prestress concrete variable cross-section box girder bridge in 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 greatly across 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 that prior art is greatly across the longitudinal arrangement diagram of cable wire of 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 longitudinal 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 longitudinal arrangement diagram of 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.
In accompanying drawing 1-Figure 20, mark is as follows:
01-base plate, 02-web, 03-sawtooth block, 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;
In accompanying drawing 21-Figure 31, mark is as follows:
1-base plate, 2-web, 3-sawtooth block, the built-in longeron of 41-, 42-built-in oblique leg, 5-base plate rope, 6-bridge pier.
Detailed description of the invention
First object of the present invention is to provide a kind of positive moment of span central point base plate rope to produce radial load upwards, elimination or reduces the impact that secondary dead load causes girder bending-down be out of shape, structural entity rigidity is large, amount of deflection is little, shear resistance is strong, cloth rope reasonable, web 2 stability and case beam anti-twisting property is good, box girder structure reasonable stress, easy construction built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge.Second object of the present invention is also the construction method providing a kind 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 present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Figure 21-31, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge that the embodiment of the present invention provides, comprise base plate 1, the web 2 of bridge pier 6 and formation case beam, be provided with an oblique leg rigid-frame structure in 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 to bridge pier 6 direction along case beam by span centre is longitudinally inclined upwardly 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 is separated with base plate 1; Built-in oblique leg 42 one end is connected with built-in longeron 41, the other end is connected with bridge pier 6, its one end be connected with built-in longeron 41 is higher than the one end be connected with bridge pier 6, and the cross section of one end that built-in oblique leg 42 is connected with bridge pier 6 is positioned at the centre of described built-in longeron 41 and the interval deck-molding of base plate 1 and is connected 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, and clean ratio of rise to span (discrepancy in elevation/across footpath) be about 1/20.
Positive moment of span central point base plate rope 5 is along curved layout on built-in longeron 41, built-in longeron 41 upper plate rope 5 stretch-draw anchor position is provided with sawtooth block 3, base plate rope 5 stretch-draw anchor end bends up in case at sawtooth block 3 place, and base plate rope 5 is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on sawtooth block 3.Top and the built-in longeron 41 of built-in oblique leg 42 are connected, and built-in oblique leg 42 and built-in longeron 41 liang of sides are connected with web 2 respectively, Special composition body structure.
Owing to being provided with upper curved built-in longeron 41, and base plate rope 5 is arranged in curved built-in longeron 41, positive moment of span central point base plate rope 5 of the present invention is made to be upper curved layouts, arrange on road at various longitudinal gradient, by arranging different upper curved ratios of slope, the radial load that under eliminating existing base plate rope, curved layout single box single chamber variable cross-section box girder bridge technology positive moment of span central point rope is downward, eliminate main span and the downward radial load of the existing patent of two-way longitudinal gradient " built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof " (patent No.: ZL 200610167317.X) base plate rope is set, solve the downward radial load of Long span variable cross-section box girder bridge positive moment of span central point rope with the difficult problem continued to increase across footpath, effectively can solve suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load easily occurs to crack, the downwarp that span centre generally occurs and the principal tensile stress crack problem that web easily occurs.
Preferably, in this embodiment, built-in longeron is longitudinally inclined upwardly along case beam or bends up setting to bridge pier direction by the ratio of slope of 5% by span centre.Certainly, also according to different bridges, different inclination ratios of slope can be adopted.
Preferably, built-in longeron 41 is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section be separated with base plate 1 is inclined upwardly and is arranged to skew lines or curve, when segregation section is curved be inclined upwardly time, its anchor point is positioned on same skew lines, the inclination ratio of slope of the upper curved inclination of base plate rope 5 can be offset case beam by the upwards component that described base plate rope 5 provides and be closed up later stage cast-in-place leveling Concrete Thick 10 centimetres, thick 10 centimetres of asphalt concrete pavement, sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculating to determine, and be provided with curve transition between the horizontal arrangement section of described built-in longeron 41 and upper curved segregation section.
Preferably, the surface of the main span part of built-in longeron 41 is concave parabola shape surface to lower recess, the upper face of built-in longeron 41 raises up and arranges the surface in convex parabola shape and be connected with the pier top horizontal segment of bridge pier, and the construct horizontal segment base plate of sections of built-in longeron 41 bottom and span centre closure segment combines together.Namely the segregation section that built-in longeron 41 is separated with base plate 1 can be concave parabola, and the position be connected with top of bridge pier is pier top horizontal segment, and the pier top horizontal segment at the position be connected with top of bridge pier is connected with concave parabola section by convex parabola section.
Wherein the transverse structure reinforcing bar of built-in longeron 41 and built-in oblique leg 42 bend up at web 2 place 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 place, and the anchorage length ensureing in web 2 is more than 40 times of bar diameter.On the built-in longeron 41 that section arranged by base plate rope 5, horizontal ribs together can be set each construction section if desired.If desired horizontal ribs can be applied with transverse prestress, transverse prestress can adopt in the outer two ends stretch-draw of case, or adopt one end to be anchored in web 2 place concrete, the other end bends up stretch-draw in case, and the transverse prestress construction that horizontal ribs applies will early than the stretching construction of longitudinal base plate rope 5.
Present invention also offers a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge construction method, bridge adopts Hanging Basket case-in-place cantilever method, during construction, built-in longeron 41 is cast-in-place with built-in oblique leg 42 cantilever together with box girder segment, or built-in longeron 41 and built-in oblique leg 42 postpone a construction stage, 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 change of span centre absolute altitude; Case beam closes up post tensioning 40%, and later stage cast-in-place leveling Concrete Thick 10 centimetres completes post tensioning 20%, and sidewalk, railing or anticollision barrier complete post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 20%; When not arranging leveling concrete, case beam closes up post tensioning 40%, and sidewalk, railing or anticollision barrier complete post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 30%; Measure according to spaning middle section the dynamic conditioning that absolute altitude carries out upper bent bottom plate rope 5 stretching process during construction.
In this manual, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
It should be noted that, a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge provided in this detailed description of the invention and construction method thereof, be applicable to the wide bridge of various longitudinal gradient main spans 150 to 200 meters (4 to 6 track), certainly, be also not precluded within when carrying out the design of other forms of beam bridge and adopt beam bridge in this detailed description of the invention and construction method.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate (1) and web (2) that form case beam, it is characterized in that, an oblique leg rigid-frame structure is provided with in 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) to bridge pier (6) direction along case beam by span centre is longitudinally inclined upwardly 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, the built-in longeron of remainder (41) is separated with base plate (1),
Described built-in oblique leg (42) one end is connected with described built-in longeron (41), the other end is connected with described bridge pier (6), its one end be connected with built-in longeron (41) is higher than the one end be connected with bridge pier (6), and the cross section of one end that described built-in oblique leg (42) is connected with bridge pier (6) is positioned at the centre of described built-in longeron (41) and base plate (1) interval deck-molding and is connected with the diaphragm of bridge pier (6), 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), upper described base plate rope (5) stretch-draw anchor position is provided with sawtooth block (3) to described built-in longeron (41), base plate rope (5) stretch-draw anchor end bends up in case at sawtooth block (3) place, and base plate rope (5) is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on sawtooth block (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 be separated with described base plate (1) is inclined upwardly and is arranged to skew lines or curve, when described segregation section is curved be inclined upwardly time, its anchor point is positioned on same skew lines, the inclination ratio of slope of the upper curved inclination of described base plate rope (5) can be offset case beam by the upwards component that described base plate rope (5) provides and be closed up later stage cast-in-place leveling Concrete Thick 10 centimetres, thick 10 centimetres of asphalt concrete pavement, sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculating to determine, and be provided with curve transition between the horizontal arrangement section of described built-in longeron (41) and 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 near last sawtooth block (3) place horizontal arrangement of bridge pier (6) side, and extend to bridge pier (6) place, built-in oblique leg (42) is provided with pier top horizontal segment at bridge pier place, built-in longeron (41) and built-in oblique leg (42) all through pier top diaphragm respectively with adjacent across built-in longeron (41) and built-in oblique leg (42) be connected as a single entity, the pier top horizontal segment of built-in longeron (41) and spanning tilt or arrange curve transition between upper bend section.
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 concave parabola shape surface to lower recess, the upper face of described built-in longeron (41) raises up and arranges the surface in convex parabola shape and be connected 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. the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1-4 any one, it is characterized in that, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) bends up at web (2) place also and the vertical reinforced-bar-welding of described web (2) is firm or overlap joint, when adopting overlap joint, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) bends up at web (2) place, and the anchorage length ensureing 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, arranges that each construction section on the built-in longeron (41) of section arranges horizontal ribs together at base plate rope (5).
7. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 6, it is characterized in that, described horizontal ribs is applied with transverse prestress, transverse prestress can adopt in the outer two ends stretch-draw of case, or adopt one end to be anchored in web (2) place concrete, the other end bends up stretch-draw in case, and the transverse prestress construction that horizontal ribs applies will early than the stretching construction of longitudinal base plate rope (5).
8. a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge construction method, it is characterized in that, bridge adopts Hanging Basket case-in-place cantilever method, during construction, cantilever is cast-in-place together for built-in longeron (41), built-in oblique leg (42) and box girder segment, or built-in longeron (41) and built-in oblique leg (42) postpone a construction stage, cast-in-place on case inner support or suspension bracket;
The stretch-draw of base plate rope (5) divides many batches to construct stage by stage according to the change of span centre absolute altitude; Case beam closes up post tensioning 40%, and later stage cast-in-place leveling Concrete Thick 10 centimetres completes post tensioning 20%, and sidewalk, railing or anticollision barrier complete post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 20%; When not arranging leveling concrete, case beam closes up post tensioning 40%, and sidewalk, railing or anticollision barrier complete post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 30%; Measure according to spaning middle section the dynamic conditioning that absolute altitude carries out upper bent bottom plate rope (5) stretching process during construction.
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| 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 |
| CN105317021B (en) * | 2015-06-18 | 2017-06-16 | 贵州省水利水电勘测设计研究院 | A kind of connection method of variable cross-section continuous rigid frame aqueduct and structure |
| CN112523061B (en) * | 2020-11-24 | 2022-06-14 | 广西交通设计集团有限公司 | UHPC stiffened prestressed concrete box girder bridge structure and construction process thereof |
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