CN103031804B - Slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge and construction method thereof - Google Patents
Slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge and construction method thereof Download PDFInfo
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- CN103031804B CN103031804B CN201310007788.4A CN201310007788A CN103031804B CN 103031804 B CN103031804 B CN 103031804B CN 201310007788 A CN201310007788 A CN 201310007788A CN 103031804 B CN103031804 B CN 103031804B
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Abstract
The invention discloses a slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge. The bridge comprises piers, and bottom plates and web plates forming a box girder; a slant leg rigid frame structure is arranged in a variable cross-section girder bridge box, and comprises internal longitudinal beams and internal aslant legs; upper bend anchoring plates upwards inclined along the longitudinal direction of the box girder from the midspan to the pier direction are arranged above the internal longitudinal beams; midspan sagging moment bottom plate ropes are arranged along the upper bend anchoring plates and upper bends of the internal longitudinal beams to form two layers of bottom plate ropes; sawtooth blocks are arranged at the tension anchoring positions of the bottom plate ropes on the internal longitudinal beams and the upper bend anchoring plates; and the tension anchoring ends of the bottom plate ropes are bent in the box at the sawtooth blocks. The bridge structure provides reasonable rope arrangement and anchoring positions to the sagging moment ropes so as to reduce the bottom plate section hollow rate and the bottom plate rope flat bending amplitude. The sagging moment bottom plate ropes generate the upward radial force to eliminate or reduce the influence of the second-phase dead load causing the girder down-warping deformation. The invention further discloses a construction method for the slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge.
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, 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. 6 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 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, radial load, first phase and secondary dead load that base plate rope 05 is downward and lane load are all downward, aggravation concrete shrinkage and creep effect, cause the lasting downwarp that the span centre operation phase is certain.
(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.
(7) level of unresolved prior art base plate hollows out rate and sharply increases problem
Prior art, strengthen increase across footpath and join rope, general base plate rope 5 is individual layer layout, and the level of base plate hollows out rate and sharply increases, when following table analyzes and strengthens across footpath, the pipe diameter length total of base plate rope 5 and the correlation of baseplate width.
From the pipe diameter length total of base plate rope and the correlation table of baseplate width, when strengthening across footpath, the consumption of base plate rope sharply increases, and the bridge pipe diameter length total of main span 200 meter level account for 60% of baseplate width.Show that the cross section of 60% base plate is wide without concrete.When strengthening across footpath, the cross section of effectively carrying sharply reduces, and may cause bottom slab crack or destruction of bursting apart.
(8) the horizontal force pulling force of the flat curved generation that unresolved prior art is excessive directly causes bottom slab crack problem.
When strengthening across footpath, the consumption of base plate rope sharply increases, and being positioned at base plate rope near case beam cross central line needs the flat junction anchoring being bent to web plate and back plate to shorten load path, and the horizontal force pulling force of excessive flat curved generation directly causes bottom slab crack.
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 generation radial load upwards, eliminate or reduce the secondary dead load impact that causes girder bending-down to be out of shape, structural entity rigidity is large, amount of deflection is little, shear resistance is strong, provide reasonable cloth rope and anchorage point, reduction base plate cross section to hollow out rate for positive bending moment rope and the curved amplitude of base plate Suo Ping, Web Stability and case beam anti-twisting property are 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 base plate and the web of bridge pier and formation 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; The top of described built-in longeron is also provided with by span centre to bridge pier direction along the longitudinal upper curved anchor plate arranged that is inclined upwardly of case beam, a described curved anchor plate part combines together with built-in longeron and base plate, and on another part, curved anchor plate is all separated with base plate with built-in longeron;
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 curved layout on upper curved anchor plate and built-in longeron, to form double-deck base plate rope, on described built-in longeron and on upper curved anchor plate, described base plate cable stretching anchorage point is provided with sawtooth block, 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 arranged at span centre closure segment construction segment level, 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, curved inclination on described base plate rope, and the inclination ratio of slope of described base plate rope can calculate and determines, calculate and can offset case beam according to the upwards component provided for described base plate rope and close 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, 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, and described curved anchor plate is stopping near last sawtooth block place, bridge pier side.
Preferably, the surface of the main span part of described built-in longeron and upper curved anchor plate 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, upper curved anchor plate 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, upper curved anchor plate 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, base plate rope arrange section built-in longeron and on horizontal ribs together with each construction section setting on curved anchor plate.
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, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge in application and technique scheme described in any one; Bridge adopts Hanging Basket case-in-place cantilever method, and upper curved anchor plate during construction, built-in longeron, built-in oblique leg cantilever together with box girder segment are cast-in-place, or upper curved anchor plate, 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 rope (5) 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) on positive bending moment base plate rope of the present invention, curved rebuilding is that base plate rope provides reasonable cloth rope position and rational anchorage point, rebuilding reduces the curved amplitude of base plate Suo Ping and the flat curved horizontal pull caused, reduce every layer of base plate rope central horizontal cross section and hollow out rate, structure improvement avoids bottom slab crack disease, rational anchorage point avoids curved rope layout and the horizontal rope of existing patented technology under the prior art of L/4 cross section to L/8 cross section and arranges the longitudinal negative interaction departing from the excessive generation of bending moment envelope diagram, efficiently solve base plate rope arrangement difficulty narrow across narrow bridge (2 to 3 track) positive bending moment many base plates position greatly.
(2) owing to being provided with upper curved anchor plate and built-in longeron, and upper bent bottom plate rope is arranged in curved anchor plate and upper curved built-in longeron, bridge of the present invention is made to 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.
(3) 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 eliminate or reduce secondary dead load and, the lane load method that causes girder bending-down to be out of shape.Radial load upwards can balance secondary dead load, lane load effect, significant with reduction construction control difficulty to the raising carrying traffic capacity.
(4) with upper curved built-in longeron in the upper curved anchor plate that in the present invention, bent bottom plate rope is arranged in, upper bent bottom 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.
(5) 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.
(6) on the bridge of various longitudinal gradient, upper bent bottom 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.
(7) bridge of the present invention can adopt prior art case-in-place cantilever method, during construction upper curved anchor plate, built-in oblique leg and upper curved built-in longeron can together with box girder segment cantilever cast-in-place, for alleviating Hanging Basket cantilever pouring weight, also it is cast-in-place on case inner support or suspension bracket to postpone a construction stage, and construction is easy to control.
(8) 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.
(9) go up the transverse prestress construction that the horizontal ribs of curved anchor plate and upper curved built-in longeron applies and will ensure that base plate does not produce longitudinal cracking early than the stretching construction of longitudinal base plate rope.
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, the upper curved anchor plate of 411-, 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 generation radial load upwards, eliminate or reduce the secondary dead load impact that causes girder bending-down to be out of shape, structural entity rigidity is large, amount of deflection is little, shear resistance is strong, provide reasonable cloth rope and anchorage point, reduction base plate cross section to hollow out rate for positive bending moment rope and the curved amplitude of base plate Suo Ping, Web Stability and case beam anti-twisting property are 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-Figure 31, built-in oblique leg 42 rigid-frame prestress concrete variable cross-section box girder bridge that the embodiment of the present invention provides, comprise base plate 1 and the web 2 of bridge pier 6 and formation 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 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, and the built-in longeron 41 of remainder is separated with base plate 1; The top of described built-in longeron 41 is also provided with by the upper curved anchor plate 411 of span centre longitudinal setting that is inclined upwardly to bridge pier 6 direction along case beam, described curved anchor plate 411 part combines together with built-in longeron 41 and base plate 1, and on another part, curved anchor plate 411 is all separated with base plate 1 with built-in longeron 41;
Wherein, 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 the interval deck-molding of base plate 1 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; 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 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 upper curved anchor plate 411 and built-in longeron 41, to form double-deck base plate rope 5, on described built-in longeron 41 and on upper curved anchor plate 411, described base 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 upper curved anchor plate 411, built-in oblique leg 42, upper curved built-in longeron 41 liang of sides are connected with web 2 respectively, Special composition body structure.
Owing to being provided with upper curved anchor plate 411 and built-in longeron 41, and upper bent bottom plate rope 5 is arranged in curved anchor plate 411 and upper curved built-in longeron 41, bridge of the present invention is made to arrange on road at various longitudinal gradient, by arranging different upper curved ratios of slope, eliminate the radial load that existing base plate rope 5 times curved layout single box single chamber variable cross-section box girder bridge technology positive moment of span central point ropes are 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.: ZL200610167317.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 2 easily occurs.
Preferably, in this embodiment, built-in longeron 41 and upper curved anchor plate 411 are longitudinally inclined upwardly along case beam or bend 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.
Wherein, combine together at the built-in longeron of span centre L/2 cross section to 3L/8 cross section section 41 and described base plate 1, built-in longeron 41 is arranged at span centre closure segment construction segment level, the segregation section be separated with described 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 curved inclination on base plate rope 5 can be offset case beam by the upwards component that 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.
In addition, built-in longeron 41 can horizontal arrangement near last sawtooth block 3 place of bridge pier 6 side, extend to bridge pier 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.Horizontal segment and the spanning of the close Dun Ding setting of built-in longeron 41 tilt or arrange curve transition between upper bend section, and described curved anchor plate 411 is stopping near last sawtooth block 3 place, bridge pier 6 side.
Wherein, built-in longeron 41 and upper curved anchor plate 411 the surface of main span part be 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.Namely the upper turn of bilge of built-in longeron 41 and upper curved anchor plate 411 is divided into concave parabola, the position that built-in longeron 41 is connected with top of bridge pier is horizontal segment, and the horizontal segment at the position that built-in longeron 41 is connected with top of bridge pier is connected with concave parabola section by convex parabola section.
Preferably, the transverse structure reinforcing bar of built-in longeron 41, upper curved anchor plate 411 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, upper curved anchor plate 411 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.
In addition, can base plate rope 5 arrange the built-in longeron 41 of section with on each construction section on curved anchor plate 411 arrange together with horizontal ribs.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 42 rigid-frame prestress concrete variable cross-section box girder bridge construction method, bridge adopts Hanging Basket case-in-place cantilever method, upper curved anchor plate 411 during construction, built-in longeron 41, built-in oblique leg 42 cantilever together with box girder segment are cast-in-place, or upper curved anchor plate 411, 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 narrow bridge of various longitudinal gradient main spans 150 to 200 meters (2 to 3 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 (9)
1. a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise base plate (1) and the web (2) of bridge pier (6) and formation 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), the top of described built-in longeron (41) is also provided with by the upper curved anchor plate (411) of span centre longitudinal setting that is inclined upwardly to bridge pier (6) direction along case beam, described curved anchor plate (411) part combines together with built-in longeron (41) and base plate (1), and on another part, curved anchor plate (411) is all separated with base plate (1) with built-in longeron (41),
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 upper curved anchor plate (411) and the upper curved layout of built-in longeron (41), to form double-deck base plate rope (5), described built-in longeron (41) above and on upper described base plate rope (5) the stretch-draw anchor position of upper curved anchor plate (411) 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).
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 arranged at span centre closure segment construction segment level, 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 upper curved inclination of described base plate rope (5), and the inclination ratio of slope of described base plate rope (5) can calculate and determines, calculate and can offset case beam according to the upwards component that provides for described base plate rope (5) and close 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, 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, described curved anchor plate (411) is stopping near last sawtooth block (3) place, bridge pier (6) side.
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) and upper curved anchor plate (411) 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, described built-in longeron (41), the transverse structure reinforcing bar of upper curved anchor plate (411) 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, described built-in longeron (41), the transverse structure reinforcing bar of upper curved anchor plate (411) 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 1, it is characterized in that, each construction section on the built-in longeron (41) and upper curved anchor plate (411) of base plate rope (5) layout section arranges horizontal ribs together.
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, be applied to the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge as described in claim 1-7 any one, it is characterized in that, bridge adopts Hanging Basket case-in-place cantilever method, during construction, cantilever is cast-in-place together for upper curved anchor plate (411), built-in longeron (41), built-in oblique leg (42) and box girder segment, or upper curved anchor plate (411), built-in longeron (41) and built-in oblique leg (42) postpone a construction stage, 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 construction method 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 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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| CN201310007788.4A CN103031804B (en) | 2013-01-09 | 2013-01-09 | Slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge and construction method thereof |
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| 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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| US5867954A (en) * | 1997-09-06 | 1999-02-09 | Lin; Wei-Hwang | Multi-axis prestressed double-tee beam and method of construction |
| JP4355240B2 (en) * | 2004-03-18 | 2009-10-28 | 大成建設株式会社 | PC box girder extrusion construction method |
| CN100491638C (en) * | 2006-12-27 | 2009-05-27 | 重庆交通大学 | Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof |
| CN100465377C (en) * | 2006-12-27 | 2009-03-04 | 重庆交通大学 | Baseboard cable horizontal arrangement prestress concrete variable cross-section box girder bridge and construction method thereof |
| CN101424075B (en) * | 2008-11-24 | 2010-10-20 | 重庆交通大学 | Concrete box girder bridge widening and reinforced structure and construction method thereof |
| CN203080398U (en) * | 2013-01-09 | 2013-07-24 | 重庆交通大学 | Pre-stressed concrete variable cross-section box girder bridge with internally-arranged slant legged rigid frame |
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