CN103233419A - Prestressed concrete variable cross-section box bridge and construction method thereof - Google Patents
Prestressed concrete variable cross-section box bridge and construction method thereof Download PDFInfo
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- CN103233419A CN103233419A CN2013100076415A CN201310007641A CN103233419A CN 103233419 A CN103233419 A CN 103233419A CN 2013100076415 A CN2013100076415 A CN 2013100076415A CN 201310007641 A CN201310007641 A CN 201310007641A CN 103233419 A CN103233419 A CN 103233419A
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Abstract
The invention discloses a prestressed concrete variable cross-section box bridge. An upwardly tilted or bent anchoring plate is arranged in the longitudinal direction of a box beam in the direction from the midspan to a bridge pier in and above the corresponding beam depth position of a bottom plate in the midspan position; the anchoring plate is integrated with the bottom plate at the section from the midspan to the 3L/8 cross section, and the remaining positions are separated; and a prestressed bottom plate cable is arranged in the anchoring plate in an upward bending way. At the same time, the invention provides a construction method of the bridge, and the construction method comprises the steps as follows: carrying out cantilever cast-in-situ construction on the sections of the anchoring plate and the box beam; or delaying for a construction period and carrying out cast-in-situ construction on a supporting frame or a lifting frame in a box; and applying a transverse prestress force to the transverse reinforcement ribs of the anchoring plate for construction before tensioning the prestressed bottom plate cable. According to the bridge and the construction method provided by the invention, the prestressed bottom plate cable is arranged in an upward bending way to provide an upward radial force for counteracting a downward action force applied by a secondary dead load or the like, so that the deflection deformation caused by the action force after a main beam is closed can be avoided, the construction control process is easy, and the bearing capacity can be increased.
Description
Technical field
The present invention relates to civil engineering bridge technology field, particularly relate to a kind of prestress concrete variable cross-section box bridge and job practices thereof.
Background technology
Much more striding the prestress concrete variable cross-section box bridge greatly is the bridge type that extensively adopts at present, to see with continuous beam and continuous rigid frame bridge, often adopts the construction of Hanging Basket cast-in-place cantilever method.
Shown in Fig. 1 to Fig. 1-2, Fig. 1 strides the structural representation of prestress concrete variable cross-section box bridge greatly for curved layout under a kind of base plate rope, Fig. 1-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 1, and Fig. 1-2 is the structural representation of bridge B-B sectional plane shown in Figure 1.
The section form that this variable cross-section box girder bridge is used always at present is the single box single chamber cross section, because stressed needs, deck-molding is continued to increase to the fulcrum cross section by span centre L/2 cross section, causes base plate 01 lower edge facade to overarch, by span centre to bridge pier 06 place's cantilever root fulcrum direction, case chamber headroom strengthens, deck-molding strengthens, and base plate 01 is thickening gradually also, and web 02 is being thickeied near the fulcrum cross section is local, base plate 01 facade vertically is arch, and base plate 01 arch ratio of rise to span (rise/main span is striden the footpath) is generally about 1/20.Sawtooth piece 03 is used for anchoring positive bending moment base plate rope 05.
Shown in Fig. 2 to Fig. 2-2, Fig. 2 strides the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged greatly for curved layout under a kind of base plate rope, Fig. 2-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 2, and Fig. 2-2 is the structural representation of bridge B-B sectional plane shown in Figure 2.
Because the positive bending moment rope is arranged in the base plate 01, so the positive bending moment rope often is called base plate rope 05, because the facade of base plate 01 is arch, this structure is arranged and is caused the facade of base plate rope 05 also to overarch, 05 time curved layout of base plate rope, and ratio of rise to span is generally about 1/20.Because base plate rope 05 is anchored on the sawtooth piece 03 by stretch-draw and its two ends, is certainly led to downward radial load by the base plate rope 05 of stretch-draw.When bridge span directly increases, adopt to increase deck-molding, thickening base plate 01, thickening web 02, increase measures such as joining rope and arrange, and increase deck-molding, increase and join rope, the radial load of base plate rope 05 further strengthens, this structure is unreasonable to cause stressed disadvantageous problem, the more big this problem in footpath of striding of bridge is more serious, is restricting the development of such bridge.
Table one has been analyzed and has been striden when directly strengthening the correlation of the radial load of base plate rope 05 and road driveway load.
Table one
As can be seen, stride when directly strengthening from table one, the radial load of base plate rope 05 sharply strengthens, and the ratio of the radial load that the base plate rope is downward and road driveway load also sharply strengthens.The influence of eliminating or reducing radial load to improve the traffic capacity, to reduce bridge defect significant.
Specifically, above under the described continuous rigid frame bridge base plate rope curved major defect of arranging show:
(1) arch floor rope 05 downward radial load produces along bridge to shearing force in associated floor 01 position, because span centre section base plate 01 is thinner, be generally 25～40cm, transverse reinforcement is by the structure configuration, the downward radial load of base plate rope 05 is excessive then easily to cause span centre section base plate 01 to occur along bridge to shear crack, serious causes bridge base plate 01 destruction of bursting apart.As shown in Table 1, stride when directly strengthening, base plate rope 05 downward radial load sharply increases, and disease is more serious.
(2) base plate rope 05 downward radial load also directly causes respective section web 02 tension, easily cause web 02 the principal tensile stress crack to occur, usually L/4 cross section to L/2 cross section this type of disease of scope is more common, relevant therewith, general L/4 cross section to L/2 cross section scope deck-molding is less, vertical prestressing control difficulty is big, if vertical effective prestress is unreliable, can aggravate disease.
(3) because base plate rope 05 need be anchored at the junction of web 02 and base plate 01 to shorten the power transmission route because of the structure requirement, to long-span bridge beam base plate rope 05 anchorage zone usually by near the span centre along reaching near the L/8 cross section, stride the positive bending moment district of variable cross-section box girder bridge of cast-in-place cantilever method construction greatly usually between L/4 cross section to span centre L/2 cross section, span centre L/2 section maximum, positive bending moment is generally very little or be hogging moment near the L/8 cross section, need with anchoring structure for guaranteeing that span centre positive bending moment is stressed, the base plate rope 05 that is arranged between L/4 cross section to L/8 cross section is misfitted with this section is stressed, the L/4 cross section cuts section bar tall and big to L/8, eccentric throw is big, and produce downward radial load maximum, so negative interaction is big.
(4) base plate rope 05 downward radial load directly causes the span centre downwarp.
(5) location of the base plate rope 05 of arch is difficult, and it is wayward to construct, and the loss of prestress of curve rope is big, and is uneconomical.
(6) downward radial load, first phase and the second stage of dead load, the lane load of base plate rope 05 is all downward, and aggravation concrete shrinkage and creep effect causes the span centre operation phase to continue downwarp.
Therefore, in order to solve the problem that above-mentioned bridge produces, a kind of baseboard cable horizontal arrangement prestress concrete variable cross-section box bridge has been proposed, shown in Fig. 3 to Fig. 4-2, Fig. 3 arranges the structural representation of striding the prestress concrete variable cross-section box bridge greatly for a kind of baseboard cable horizontal in the prior art, Fig. 3-1 is the structural representation of the A-A sectional view of bridge shown in Figure 3, Fig. 3-2 is the structural representation of bridge B-B sectional view shown in Figure 3, Fig. 4 arranges for a kind of baseboard cable horizontal in the prior art and strides the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged greatly, Fig. 4-1 is the structural representation of the A-A sectional view of bridge shown in Figure 4, and Fig. 4-2 is the structural representation of bridge B-B sectional view shown in Figure 4.
Above baseboard cable horizontal arranges that the technical scheme of striding the prestress concrete variable cross-section box bridge greatly is: span centre base plate 11 respective beam high positions longitudinally arrange horizontal anchor plate 14 in the case beam, at span centre L/2 cross section to 3L/8 cross section section, horizontal anchor plate 14 and base plate 11 combine together, separate with base plate 11 all the other positions, base plate rope 15 is arranged in the horizontal anchor plate 14, horizontal anchor plate 14 in base plate rope 15 stretch-draw anchor positions arranges sawtooth piece 13, base plate rope 15 stretch-draw anchor ends bend up in the case at sawtooth piece 13 places, and longitudinally symmetrically stretch-draw anchor on sawtooth piece 13.Horizontal anchor plate 14 can extend to bridge pier 16 places and pass pier top diaphragm 17 and be connected as a single entity with adjacent horizontal anchor plate 14 of striding, and also can stop near last sawtooth piece 13 place of bridge pier 16 sides and in horizontal anchor plate 14 rear ends safety barrier is being set.
Striding the prestress concrete variable cross-section box bridge greatly with curved layout under a kind of base plate rope above compares, the characteristics of baseboard cable horizontal arrangement prestress concrete variable cross-section box bridge are: (1) is in the bridge of longitudinal gradient horizontal arrangement, owing to be provided with horizontal anchor plate 14, and base plate rope 15 is arranged in the horizontal anchor plate 14, make that span centre positive bending moment base plate rope 15 is horizontal arrangement, eliminated the downward radial load of prior art span centre positive bending moment rope, solved and striden the downward radial load of footpath variable cross-section box girder bridge span centre positive bending moment rope greatly with striding the difficult problem that the footpath continues to increase, can effectively solve suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load is prone to the crack, the downwarp that span centre generally occurs, the principal tensile stress crack problem that web is prone to.(2) base plate rope 15 is arranged in the horizontal anchor plate 14, adopt the prestress concrete variable cross-section box bridge of striding greatly of cantilever-construction to compare with curved layout the under the traditional base plate rope, the moment of flexure envelope diagram is more identical, stressed reasonable, can overcome the bigger positive bending moment in span centre L/2 cross section to 3L/8 cross section, positive hogging moment all near the less L/4 cross section near central compression, near the L/8 cross section, can resist the part hogging moment.(3) bridge base plate rope 15 is arranged in the horizontal anchor plate 14, has simplified structure design and the construction of prior art base plate, has improved bottom slab stress.
But, so arrange, will produce following problem: (1) baseboard cable horizontal arranges that the base plate rope 15 of striding the prestress concrete variable cross-section box bridge is greatly arranged and the moment of flexure envelope diagram of striding the prestress concrete variable cross-section box bridge greatly of employing cantilever-construction can not fit like a glove, and has certain deviation.(2) for reducing the high cost of saving of end bay pier, improve the main span under-clearance or overcome the span centre downwarp, two-way 2% left and right sides longitudinal gradient of main span operated by rotary motion, arranging on the bridge of longitudinal gradient, be convenient design and construction, mean level anchor plate and bridge floor be arranged in parallel, and base plate rope 15 is arranged on two-way 2% left and right sides longitudinal gradient, and there is the downward radial load of part in base plate rope 15.(3) base plate rope 15 horizontal arrangement prestress concrete variable cross-section box bridges can not provide component upwards, can not balance second phase dead load and the downward active force of lane load.(4) do not provide to eliminate or reduce the second stage of dead load and cause girder bending-down Deformation Control method, it is wayward that main span is closed up the back distortion.(5) arrange on the bridge of two-way longitudinal gradient in main span, downward radial load, first phase and the second stage of dead load, the lane load of base plate rope 15 is all downward, and aggravation concrete shrinkage and creep effect causes span centre operation certain lasting downwarp of phase.
Prior art adopts the follow-up construction working of striding greatly after prestress concrete variable cross-section box bridge girder closes up of cantilever-construction that following characteristics are arranged:
After closing up, the case beam of striding the prestress concrete variable cross-section box bridge in the prior art greatly carries out the cast-in-place leveling concrete construction in thick 10 centimetres of left and right sides, thick 10 centimetres of left and right sides asphalt concrete pavement constructions, sidewalk, railing or anticollision barrier construction.
The cast-in-place leveling concrete in thick 10 centimetres of left and right sides, thick 10 centimetres of left and right sides asphalt concrete pavements, sidewalk, railing or anticollision barrier weight are commonly referred to as the second stage of dead load.
Dead load construction stage second phase, the general stretch-draw of base plate rope is finished.The second phase dead load generally adopts concrete material, and the part bridge railing adopts steel work, and is bigger from weight average.
Table two has been listed the proportionate relationship of the second stage of dead load and highway Design Lane load.The second phase dead load is generally about 2 times of highway Design Lane load, eliminate or reduce influence that the second stage of dead load causes the girder bending-down distortion to improve the traffic capacity, to reduce the construction control difficulty significant.
Table two
Summary of the invention
Defective and deficiency at prior art, the object of the present invention is to provide radial load that a kind of generation makes progress, eliminate or reduce the influence that the second stage of dead load causes the girder bending-down distortion, construct the prestress concrete variable cross-section box bridge of stressed more reasonable, easy construction, a kind of job practices of prestress concrete variable cross-section box bridge also is provided simultaneously.
To achieve these goals, technical scheme of the present invention is:
A kind of prestress concrete variable cross-section box bridge, comprise bridge pier, base plate, web, prestress baseboard rope and anchor plate, the described base plate respective beam high position of span centre position and above, direction from span centre to described bridge pier vertically arranges the anchor plate that is inclined upwardly or bends up along the case beam, at span centre to 3L/8 cross section section, the base plate of described anchor plate and described case beam combines together, and separate all the other positions; Described prestressed concrete is in described anchor plate inside.
Preferably, the surface of the main span part of described anchor plate is the spill parabolic surface to lower recess, the upper face of described anchor plate raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of described bridge pier, described anchor plate bottom be arranged at the construct described base plate of horizontal segment of sections of span centre closure segment and combine together.
Preferably, described anchor plate is positioned at described prestress baseboard cable stretching anchorage point and is provided with the sawtooth piece, and described prestress baseboard cable stretching anchored end bends up in the case beam at described sawtooth piece place, and along the vertical symmetrical stretch-draw anchor of case beam on described sawtooth piece.
Preferably, described anchor plate extends to last described sawtooth piece horizontal arrangement of described bridge pier side and extends to described bridge pier place and pass pier top diaphragm and adjacent described anchor plate of striding is connected as a single entity.
Preferably, the pier top horizontal segment of described anchor plate and the changeover portion between the spanning tilting section are curve transition.
Preferably, described anchor plate stops with last described sawtooth piece place of close described bridge pier side and in described anchor plate rear end safety barrier is set.
Preferably, the transverse structure reinforcing bar of described anchor plate bends up at the web place also and the vertical reinforcement firm welding of described web.
Preferably, L/2 cross section to the described anchor plate of 3L/8 section is provided with horizontal ribs in the case girder span, applies transverse prestress at described horizontal ribs.
The present invention provides a kind of job practices of prestress concrete variable cross-section box bridge simultaneously, bridge adopts the construction of Hanging Basket cast-in-place cantilever method, described anchor plate and box girder segment cantilever together are cast-in-place, or described anchor plate is postponed a construction stage, cast-in-place construction on case inner support or suspension bracket, being arranged at the transverse prestress construction that applies on the described horizontal ribs of described anchor plate will be early than the stretching construction of vertical described prestress baseboard rope.
Preferably, the case beam closes up post tensioning 40%, and cast-in-place leveling Concrete Thick is finished post tensioning 20% for 10 centimetres, and sidewalk, railing or anticollision barrier are finished post tensioning 20%, and asphalt concrete pavement is finished post tensioning 20% for thick 10 centimetres; When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and asphalt concrete pavement is finished post tensioning 30% for thick 10 centimetres.
A kind of prestress concrete variable cross-section box bridge provided by the present invention comprises base plate, web, prestress baseboard rope and the anchor plate of bridge pier, case beam, the base plate respective beam high position of span centre position and above, direction from span centre to bridge pier is by along the case beam anchor plate that is inclined upwardly or bends up being set vertically, at span centre to 3L/8 cross section section, the base plate of anchor plate and case beam combines together, and separate all the other positions; Prestressed concrete is in anchor plate inside.So arrange, anchor plate is inclined upwardly according to certain ratio of slope in span centre closure segment horizontal arrangement again, place the prestress baseboard rope of anchor plate inside on anchor plate, to bend layout, and curved ratio of slope is according to energy balance second phase dead load on the anchor plate, the active force of track load is determined, therefore, go up the curved prestress baseboard rope of arranging radial load upwards can be provided, to offset the second stage of dead load, the downward active force that track load etc. applies, guarantee can lower flexure strain not take place because of downward active force after girder closes up, absolute altitude is constant substantially after can guaranteeing closure of bridge structure, be easy to construction control, overcome the drawback of the downward radial load of similar bridge, improve its carrying traffic capacity, increase its span ability.
The job practices of a kind of prestress concrete variable cross-section box bridge provided by the present invention, bridge adopts the construction of Hanging Basket cast-in-place cantilever method, anchor plate and box girder segment cantilever together are cast-in-place, or anchor plate is postponed a construction stage, cast-in-place construction on case inner support or suspension bracket, being arranged at the transverse prestress construction that applies on the horizontal ribs of anchor plate will be early than the stretching construction of vertical base plate rope.Adopt this form of construction work, compare with form of construction work in the prior art, avoid the suitable bridge of anchor plate to cracking, anchor plate is postponed a construction stage, can alleviate Hanging Basket cantilever pouring weight, and construction is easy to control.
Description of drawings
Fig. 1 strides the structural representation of prestress concrete variable cross-section box bridge greatly for curved layout under a kind of base plate rope in the prior art;
Fig. 1-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 1;
Fig. 1-2 is the structural representation of bridge B-B sectional plane shown in Figure 1;
Fig. 2 strides the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged greatly for curved layout under a kind of base plate rope in the prior art;
Fig. 2-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 2;
Fig. 2-2 is the structural representation of bridge B-B sectional plane shown in Figure 2;
Fig. 3 arranges the structural representation of striding the prestress concrete variable cross-section box bridge greatly for a kind of baseboard cable horizontal in the prior art;
Fig. 3-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 3;
Fig. 3-2 is the structural representation of bridge B-B sectional plane shown in Figure 3;
Fig. 4 arranges for a kind of baseboard cable horizontal in the prior art and strides the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged greatly;
Fig. 4-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 4;
Fig. 4-2 is the structural representation of bridge B-B sectional plane shown in Figure 4;
Fig. 5 is the structural representation of prestress concrete variable cross-section box bridge in a kind of specific embodiment provided by the present invention;
Fig. 5-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 5;
Fig. 5-2 is the structural representation of bridge B-B sectional plane shown in Figure 5;
Fig. 6 is the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged in a kind of specific embodiment provided by the present invention;
Fig. 6-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 6;
Fig. 6-2 is the structural representation of bridge B-B sectional plane shown in Figure 6;
Wherein: among Fig. 1-Fig. 2-2:
Among Fig. 3-Fig. 4-2:
Among Fig. 5-Fig. 6-2:
The specific embodiment
Core of the present invention provides a kind of prestress concrete variable cross-section box bridge and job practices thereof, eliminates or reduces the influence that the second stage of dead load and lane load cause the girder bending-down distortion, and it is stressed reasonable construct.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 5 to Fig. 6-2, Fig. 5 is the structural representation of prestress concrete variable cross-section box bridge in a kind of specific embodiment provided by the present invention; Fig. 5-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 5; Fig. 5-2 is the structural representation of bridge B-B sectional plane shown in Figure 5; Fig. 6 is the structural representation that prestress concrete variable cross-section box bridge cable wire is vertically arranged in a kind of specific embodiment provided by the present invention; Fig. 6-1 is the structural representation of the A-A sectional plane of bridge shown in Figure 6; Fig. 6-2 is the structural representation of bridge B-B sectional plane shown in Figure 6.
Prestress concrete variable cross-section box bridge provided by the present invention, comprise bridge pier 6, base plate 1, web 2, prestress baseboard rope 5 and anchor plate 4, be arranged at respective beam high position and the top thereof of the base plate 1 of span centre position, 6 direction vertically arranges the anchor plate 4 that is inclined upwardly or bends up by certain ratio of slope along the case beam from span centre to bridge pier, at span centre to 3L/8 cross section section, the base plate 1 of anchor plate 4 and case beam combines together, and separate all the other positions; Curved anchor plate 4 inside that are arranged on the prestress baseboard rope 5.The thickness of anchor plate 4 is identical with the thickness of base plate 1 span centre position, is generally 30-50cm.
So arrange, anchor plate 4 is inclined upwardly in span centre closure segment horizontal arrangement and according to certain ratio of slope, place the prestress baseboard rope 5 of anchor plate 4 inside on anchor plate 4, to bend layout, and curved ratio of slope is to determine according to the active force of energy balance second phase dead load and track load on the anchor plate 4, therefore, go up the curved prestress baseboard rope of arranging 5 radial load upwards can be provided, to offset the second stage of dead load, the downward active force that track load etc. applies, guarantee can lower flexure strain not take place because of downward active force after girder closes up, absolute altitude is constant substantially after can guaranteeing closure of bridge structure, be easy to construction control, overcome the drawback of the downward radial load of similar bridge, improve its carrying traffic capacity, increase its span ability.Certainly, prestress baseboard rope 5 so is set part shearing resistance component also can be provided, improve the shear resistance of bridge, the shearing resistance distortion ability that anchor plate 4 also can improve bridge simultaneously is set.
In this specific embodiment, anchor plate 4 be on 5% the ratio of slope to being in tilted layout, certainly, also can adopt different inclination ratios of slope according to different bridges.
For the ease of construction, the surface of the main span part of anchor plate 4 is the spill parabolic surface to lower recess, the upper face of anchor plate 4 raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of bridge pier 6, anchor plate 4 bottoms be arranged at the construct base plate 1 of horizontal segment of sections of span centre closure segment and combine together.
Need to prove, the integral part of anchor plate 4 is parabola shaped setting, wherein the parabola shaped two ends of anchor plate 4 are connected with the pier top horizontal ends of bridge pier 6, and the surface of the linkage section of anchor plate 4 and bridge pier 6 is the convex parabolic surface that raises up and arrange.
So arrange, can make prestress baseboard rope 5 facades that are arranged at anchor plate 4 form the parabola shaped facade of spill, make that the moment of flexure envelope diagram of prestress baseboard rope 5 and beam bridge is identical substantially, the bigger positive bending moment in span centre L/2 cross section to 3L/8 cross section can be overcome, near the L/8 cross section, the part hogging moment can be resisted.
Shown in Fig. 6 to Fig. 6-2, prestress baseboard rope 5 is arranged in the anchor plate 4, anchor plate 4 in prestress baseboard rope 5 stretch-draw anchor positions arranges sawtooth piece 3, prestress baseboard rope 5 stretch-draw anchor ends bend up in the case at sawtooth piece 3 places, after the case beam closes up, press vertical symmetrical stretch-draw anchor on sawtooth piece 3.
The radial load of prestress baseboard rope 5 is bigger to the 3L/8 section horizontal plane in span centre L/2 cross section, the transverse structure reinforcing bar of this section anchor plate 4 will be strengthened especially, at horizontal anchor plate 4 horizontal ribs is set in case of necessity, applies transverse prestress at horizontal ribs in case of necessity.
In addition, a kind of job practices of prestress concrete variable cross-section box bridge is provided in this specific embodiment, and this method is: bridge adopts the construction of Hanging Basket cast-in-place cantilever method, and anchor plate 4 and box girder segment are cast-in-place together, or 4 construction stages of postponement of anchor plate, cast-in-place on case inner support or suspension bracket.Being arranged at the transverse prestress construction that applies on the horizontal ribs of anchor plate 4 will be early than the stretching construction of longitudinal prestressing base plate rope 5, and laterally precompression can avoid bridge to produce longitudinal cracking.
The stretch-draw of base plate rope divides many batches of multistages to construct according to the variation zone of reasonableness of span centre absolute altitude.The case beam closes up post tensioning 40%, and the later stage, cast-in-place leveling Concrete Thick was finished post tensioning 20% for 10 centimetres, and sidewalk, railing or anticollision barrier are finished post tensioning 20%, and asphalt concrete pavement is finished post tensioning 20% for thick 10 centimetres.When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and asphalt concrete pavement is finished post tensioning 30% for thick 10 centimetres.The stretching force segmentation scales of base plate rope can be adjusted according to the variation zone of reasonableness of case stress beam and distortion.
So, anchor plate 4 can be cast-in-place with box girder segment cantilever together during construction, for alleviating Hanging Basket cantilever pouring weight, it is cast-in-place on case inner support or suspension bracket that anchor plate 4 also can be postponed a construction stage, construction is easy to control, and the stretch-draw of prestress baseboard rope 5 simultaneously divides many batches of multistages to construct according to the variation zone of reasonableness of span centre absolute altitude, can realize that the main span first phase closes up after, the bridge absolute altitude is constant substantially, also is easy to construction is controlled simultaneously.
Need to prove, a kind of prestress concrete variable cross-section box bridge and the job practices thereof that provide in this specific embodiment, be applicable to 100 to 150 meters wide bridges of various longitudinal gradient main spans (4 to 6 track), certainly, also be not precluded within beam bridge and the job practices of carrying out adopting when other forms of beam bridge designs in this specific embodiment.
More than a kind of prestress concrete variable cross-section box bridge provided by the present invention and job practices thereof are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. prestress concrete variable cross-section box bridge, comprise bridge pier (6), base plate (1), web (2), prestress baseboard rope (5) and anchor plate (4), it is characterized in that: described base plate (1) respective beam high position and top thereof in the span centre position, direction from span centre to described bridge pier (6) vertically arranges the anchor plate (4) that is inclined upwardly or bends up along the case beam, at span centre to 3L/8 cross section section, described anchor plate (4) and described base plate (1) combine together, and separate all the other positions; Described prestress baseboard rope (5) is gone up curved described anchor plate (4) inside that is arranged in.
2. prestress concrete variable cross-section box bridge according to claim 1, it is characterized in that, the surface of the main span part of described anchor plate (4) is the spill parabolic surface to lower recess, the upper face of described anchor plate (4) raises up to arrange and is the convex parabolic surface and links to each other with the pier top horizontal segment of described bridge pier (6), described anchor plate (4) bottom be arranged at the construct described base plate (1) of horizontal segment of sections of span centre closure segment and combine together.
3. prestress concrete variable cross-section box bridge according to claim 1, it is characterized in that, described anchor plate (4) is positioned at described prestress baseboard rope (5) stretch-draw anchor position and is provided with sawtooth piece (3), described prestress baseboard rope (5) stretch-draw anchor end is located to bend up in the case beam at described sawtooth piece (3), and along the vertical equal symmetrical stretch-draw anchor of case beam on described sawtooth piece (3).
4. prestress concrete variable cross-section box bridge according to claim 3, it is characterized in that described anchor plate (4) extends to last described sawtooth piece (3) horizontal arrangement of described bridge pier (6) side and extends to described bridge pier (6) and locates and pass pier top diaphragm (7) and adjacent described anchor plate (4) of striding and be connected as a single entity.
5. prestress concrete variable cross-section box bridge according to claim 4 is characterized in that, pier top horizontal segment and the changeover portion between the spanning tilting section of described anchor plate (4) are curve transition.
6. prestress concrete variable cross-section box bridge according to claim 4 is characterized in that, described anchor plate (4) is in locating termination near last described sawtooth piece (3) of described bridge pier (6) side and in described anchor plate (4) rear end safety barrier being set.
7. according to arbitrary described prestress concrete variable cross-section box bridge of claim 1 to 6, it is characterized in that the transverse structure reinforcing bar of described anchor plate (4) is located to bend up also and the vertical reinforcement firm welding of described web (2) at web (2).
8. prestress concrete variable cross-section box bridge according to claim 7 is characterized in that, L/2 cross section to the described anchor plate (4) of 3L/8 section is provided with horizontal ribs in the case girder span, applies transverse prestress at described horizontal ribs.
9. the job practices of a prestress concrete variable cross-section box bridge, it is characterized in that: bridge adopts the construction of Hanging Basket cast-in-place cantilever method, cantilever is cast-in-place together for described anchor plate (4) and box girder segment, or described anchor plate (4) is postponed a construction stage, cast-in-place construction on case inner support or suspension bracket, being arranged at the transverse prestress construction that applies on the described horizontal ribs of described anchor plate (4) will be early than the stretching construction of vertical described prestress baseboard rope (5).
10. the job practices of prestress concrete variable cross-section box bridge according to claim 9, it is characterized in that, the case beam closes up post tensioning 40%, cast-in-place leveling Concrete Thick is finished post tensioning 20% for 10 centimetres, sidewalk, railing or anticollision barrier are finished post tensioning 20%, and asphalt concrete pavement is finished post tensioning 20% for thick 10 centimetres; When the leveling concrete was not set, the case beam closed up post tensioning 40%, and sidewalk, railing or anticollision barrier are finished post tensioning 30%, and asphalt concrete pavement is finished post tensioning 30% for thick 10 centimetres.
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| CN201310007641.5A CN103233419B (en) | 2013-01-09 | 2013-01-09 | A kind of prestress concrete variable cross-section box bridge and construction method thereof |
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| CN104452569A (en) * | 2014-11-24 | 2015-03-25 | 王汉席 | Large-span prestressed concrete girder bridge cable arrangement method |
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| CN103233419B (en) | 2015-09-30 |
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