CN1974929A - Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof - Google Patents
Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof Download PDFInfo
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- CN1974929A CN1974929A CNA200610167317XA CN200610167317A CN1974929A CN 1974929 A CN1974929 A CN 1974929A CN A200610167317X A CNA200610167317X A CN A200610167317XA CN 200610167317 A CN200610167317 A CN 200610167317A CN 1974929 A CN1974929 A CN 1974929A
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Abstract
The present invention belongs to the field of civil engineering bridge technology, and discloses a kind of built-in oblique leg rigid frame prestressed concrete non-uniform box beam bridge. It is characterized by that in its box beam interior an oblique leg rigid frame structure is set, said oblique leg rigid frame structure is formed from built-in longitudinal beam and built-in oblique leg. The built-in oblique leg and box beam baseplate are parallelly arranged and identical in thickness, and the built-in longitudinal beam and midspan baseplate are aligned and identical in thickness, the midspan baseplate, box beam baseplate and built-in longitudinal beam are combined into one body, so that said bridge structure has high integral rigidity, small deflection and strong resistance to shear, and the crossing capacity of said prestressed concrete non-uniform box beam bridge can be greatly raised.
Description
Technical field
This invention belongs to civil engineering bridge technology field, relates in particular to a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, with and job practices.
Background technology
Much more striding prestress concrete variable cross-section box girder 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.Fig. 1 is existing a kind of facade arrangement diagram of striding prestress concrete variable cross-section box girder bridge greatly, be continuous rigid frame bridge, the span centre deck-molding is less than the fulcrum deck-molding that is positioned at bridge pier 6 places, and the bottom is a case beam base plate 1, girder lower edge facade is smooth arch, adopts the construction of segmentation Hanging Basket cantilever cast in place process.To shown in Figure 5, its case beam adopts the single box single chamber cross section by Fig. 3, and by the direction of span centre to cantilever root fulcrum, case chamber headroom strengthens, and its deck-molding strengthens, and base plate 1 is thickeied gradually, and base plate 1 facade is smooth arch, and the clean ratio of rise to span of base plate 1 is 1/12.7.The sawtooth piece 3 that is used for anchoring base plate rope 5 be arranged on web 2 and base plate 1 in conjunction with the corner.Extremely shown in Figure 16 by Figure 13, the vertical arrangement of its cable wire is: top board hogging moment rope horizontal arrangement, be anchored near web 2 places, 7 times curved layouts of web rope provide certain shearing resistance component that makes progress, span centre positive bending moment base plate rope 5 is arranged in the base plate 1, and base plate rope 5 is anchored on the sawtooth piece 3, and base plate rope 5 facades are the arch consistent with base plate 1, therefore the base plate rope 5 of arch can produce downward radial load when being subjected to pulling force, and anchored end is big away from the downward radial load of the base plate rope 5 of span centre.
Prior art is striden prestress concrete variable cross-section box girder bridge greatly and is had following structure and stressed irrational problem, strides that directly big more problem is serious more, is restricting the development of such bridge:
(1) section form that variable cross-section box girder bridge is commonly used 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, cause the lower edge facade of base plate 1 to overarch, the positive bending moment rope is arranged in the base plate 1, so the positive bending moment rope often is called base plate rope 5, this structure is arranged and is caused base plate rope 5 facades also to overarch, certainly leads to downward radial load during 5 stretch-draw of base plate rope.When bridge span directly increased, prior art was that employing increases measures such as deck-molding, thickening base plate 1, local thickening web 2, increase arrangement of reinforcement, and increases arrangement of reinforcement, and the radial load of base plate rope 5 further strengthens.Web 2 and base plate 1 thickening are handled and can be solved the pressure-bearing problem, but it is big that the contribution of the rigidity of beam body is not increased deck-molding, increasing deck-molding trailing web 2 stability can reduce, web 2 can be thickeied, but further strengthen deadweight, increase the downward radial load of deck-molding span centre positive bending moment bundle and further strengthen, so prior art is striden prestress concrete variable cross-section box girder bridge greatly, striding when directly increasing has bigger negative interaction by strengthening conventional boxes cell structure deck-molding, thickening web 2 and base plate 1.
(2) base plate rope 5 downward radial loads produce along bridge in the associated floor position to shearing force, span centre section base plate 1 is thinner, be generally 25～40cm, transverse reinforcement is by the structure configuration, the downward radial load of base plate rope 5 is excessive then easily to cause span centre section base plates 1 to occur along bridge to shear crack, serious causes bridge base plate 1 destruction of bursting apart.
(3) base plate rope 5 downward radial loads directly cause respective section web 2 tensions, easily cause web 2 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 prestressing is unreliable, can aggravate disease.
(4) because base plate rope 5 need be anchored at web 2 and base plate 1 junction to shorten the power transmission route because of the structure requirement, to long-span bridge beam base plate rope 5 anchorage zones usually by near the span centre near the L/8 cross section, the positive bending moment district of variable cross-section box girder bridge of striding cast-in-place cantilever method construction greatly is usually between L/4 cross section to span centre L/2 cross section, span centre L/2 cross 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, 5 pairs of these sections of base plate rope that are arranged between L/4 cross section to L/8 cross section are stressed unfavorable, 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.
(5) base plate rope 5 downward radial loads directly cause the span centre downwarp.
(6) arch floor rope 5 location are difficult, and it is wayward to construct, and the loss of prestress of curve rope is big, and is uneconomical.
Summary of the invention
At the defective and the deficiency of prior art, the object of the present invention is to provide that a kind of structural entity rigidity is big, amount of deflection is little, shear resistance is strong, the cloth rope rationally, span centre positive bending moment rope do not produce that downward radial load, case beam construction are stressed rationally, the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge structure of easy construction with and job practices.
Technical solution of the present invention is as follows: built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate 1 and the web 2 that constitute the case beam, it is characterized in that: an oblique leg rigid-frame structure is set in variable cross-section box girder bridge case beam, and the oblique leg rigid-frame structure is made up of built-in longeron 41 and built-in oblique leg 42; Built-in longeron 41 is located at span centre base plate 1 respective beam high position in the case beam, and section base plate 1 and built-in longeron 41 combine together near span centre L/2 cross section to the 3L/8 cross section, built-in longeron 41 height and span centre base plate 1 consistency of thickness; Built-in oblique leg 42 1 ends and built-in longeron 41 are connected as a single entity, its both sides and web 2 are connected as a single entity, built-in oblique leg 42 and case beam base plate 1 are arranged in parallel, built-in oblique leg 42 and base plate 1 radial distance are 1/4～1/5 of the total deck-molding H of fulcrum, built-in oblique leg 42, case beam base plate 1 and web 2 all adopt uniform section, and thickness is 40～60cm; Line is hanged in the linear employing of case beam base plate 1 lower edge, and clean ratio of rise to span is 1/7～1/9; Span centre positive bending moment base plate rope 5 is along built-in longeron 41 horizontal arrangement, on the built-in longeron 41 of base plate rope 5 stretch-draw anchor positions, the sawtooth piece is set, base plate rope 5 stretch-draw anchor ends bend up in the case at sawtooth piece 3 places, and two anchored end symmetry stretch-draw of base plate rope 5 also are anchored on the sawtooth piece 3.
The present invention also provides the job practices of this bridge: bridge adopts the construction of Hanging Basket cast-in-place cantilever method, built-in longeron 41 and built-in oblique leg 42 can be cast-in-place with box girder segment cantilever together during construction, for alleviating Hanging Basket cantilever pouring weight, built-in longeron 41 and built-in oblique leg 42 also can be postponed a construction stage, and be cast-in-place on support or suspension bracket.
The present invention compares with prior art, and its beneficial effect is:
(1) span centre positive bending moment baseboard cable horizontal of the present invention is arranged, 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 the downwarp that suitable bridge that the variable cross-section box girder bridge span centre base plate that caused by radial load is prone to generally occurs to crack, span centre, the concurrent disease problems such as principal tensile stress crack that web is prone to.
(2) the present invention is provided with built-in horizontal girder in the case beam, satisfy positive bending moment rope horizontal arrangement, radial load under undirected, the fulcrum deck-molding can need further to strengthen by rigidity, greatly then the dead load amount of deflection is little for the rigidity of structure, later stage shrinkage and creep amount of deflection is little, can effectively solve the downwarp phenomenon that the prestress concrete variable cross-section box girder bridge span centre is prone to.
(3) after the present invention is provided with built-in oblique leg rigid-frame in the case beam, improved the stability of web, guaranteeing that web has under the situation of enough stability, total deck-molding can further strengthen by the stressed needs of shearing resistance, concrete structure shear resistance strengthens, deck-molding can reduce the big influence of the short bundle loss of traditional vertical prestressing greatly, for vertical prestressing bundle validity provides assurance, can adopt the steel strand rope, also can guarantee the bigger shearing resistance component that makes progress simultaneously for vertically bending down to restraint to provide than large space, can not establish vertically down curved bundle when the vertical prestressing bundle is reliable with simplified construction design and construction, bridge of the present invention can effectively solve the difficult problem that the prestress concrete variable cross-section box girder bridge web is prone to the principal tensile stress crack.
(4) after the present invention is provided with built-in oblique leg rigid-frame in the case beam, but the thickness attenuate of web and base plate, built-in oblique leg adds up to prior art thickening degree entity base plate with baseboard material compares increase seldom, but total deck-molding strengthens, stress performance improves greatly, and bridge of the present invention improves the box girder bridge cost performance height of span ability by increasing deck-molding, thickening web and base plate than prior art.
(5) after the present invention was provided with built-in oblique leg rigid-frame in the case beam, base plate, web all can adopt uniform section, had simplified structure design and construction.
(6) bridge baseboard cable horizontal of the present invention is arranged, loss of prestress is little, and construction is easy to control, good economy performance.
(7) bridge baseboard cable horizontal of the present invention is arranged, has simplified the structure design and the construction of prior art base plate, has improved bottom slab stress.
(8) bridge baseboard cable horizontal of the present invention is arranged, coincide with the moment of flexure envelope diagram of striding prestress concrete variable cross-section box girder bridge greatly that adopts cantilever-construction, stressed reasonable, can overcome the bigger positive bending moment in span centre L/2 cross section to 3L/8 cross section, near all less L/4 cross section of positive hogging moment,, near the L/8 cross section, can resist the part hogging moment near central compression.
(9) bridge of the present invention can adopt the construction of prior art cast-in-place cantilever method, the cantilever construction of outer container beam and the cantilever construction of built-in oblique leg rigid-frame are combined together, built-in longeron and built-in oblique leg can be cast-in-place with box girder segment cantilever together during construction, for alleviating Hanging Basket cantilever pouring weight, built-in longeron and built-in oblique leg also can be postponed a construction stage, in the case beam, establish support or suspension bracket is cast-in-place, compare a large amount of battered leg construction bracket expenses of having saved with the rigid frame bridge with inclined legs prior art.
(10) integral bridge profile of the present invention is an arch, linear, the clean ratio of rise to span of base plate lower edge can be determined according to the environmental landscape needs, guarantee handsome in appearance, can be used for straight bridge or curved bridge, compliance is strong, solved the small radius Horizontal Curve Sections and built a difficult problem, for Landscape Bridge design provides new approaches with arch bridge landscape effect bridge.
(11) built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of the present invention has solved structure and stressed problems such as reasonable cloth rope, intensity, rigidity, stability, can significantly improve the span ability of prestress concrete variable cross-section box girder bridge, its cantilever construction main span is expected to break through 400 meters.Become 200 meters～400 meters and stride the most competitive bridge type in footpath.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and the specific embodiments:
Fig. 1 strides prestress concrete variable cross-section box girder bridge facade arrangement diagram greatly for prior art.
Fig. 2 is a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge facade arrangement diagram of the present invention.
Figure 3 shows that prior art strides the prestress concrete variable cross-section box girder bridge constructional drawing greatly.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the B-B sectional view of Fig. 3.
Fig. 6 is a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge constructional drawing of the present invention.
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 strides the vertical arrangement diagram of prestress concrete variable cross-section box girder bridge cable wire greatly for prior art.
Figure 14 is the A-A sectional view of Figure 13.
Figure 15 is the B-B sectional view of Figure 13.
Figure 16 is the C-C sectional view of Figure 13.
Figure 17 is the vertical arrangement diagram of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge cable wire of the present invention.
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.
Among the figure: 1, case beam base plate, 2, the case web, 3, the sawtooth piece, 41, built-in longeron, 42, built-in oblique leg, 5, the base plate rope, 6, bridge pier, 7, the web rope.
The specific embodiment
Extremely shown in Figure 20 referring to Fig. 6 to Figure 12 and Figure 17, built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge of the present invention, the base plate 1, the web 2 that comprise bridge pier 6 and formation case beam, be in prior art variable cross-section box girder bridge case beam an oblique leg rigid-frame structure to be set, the oblique leg rigid-frame structure is made up of built-in longeron 41 and built-in oblique leg 42.Built-in oblique leg 42 and case beam base plate 1 are arranged in parallel, and built-in oblique leg 42 and base plate 1 radial distance are 1/4～1/5 of the total deck-molding H of fulcrum, and built-in oblique leg 42, case beam base plate 1 and web 2 all adopt uniform section, and thickness is 40～60cm.Line is hanged in the linear employing of case beam base plate 1 lower edge, has the arch bridge landscape effect, and clean ratio of rise to span is 1/7～1/9.Built-in longeron 41 is located at span centre base plate 1 respective beam high position in the case beam, section base plate 1 and built-in longeron 41 combine together near span centre L/2 cross section to the 3L/8 cross section, be entity section, built-in longeron 41 height and span centre base plate 1 consistency of thickness, be generally 25～40cm, span centre positive bending moment base plate rope 5 is provided with the sawtooth piece along built-in longeron 41 horizontal arrangement on the built-in longeron 41 of base plate rope 5 stretch-draw anchor positions.Base plate rope 5 stretch-draw anchor ends bend up in the case at sawtooth piece 3 places, after the case beam closes up, and symmetrical stretch-draw base plate rope 5 and anchoring.Built-in oblique leg 42 tops and built-in longeron 41 fuse, and built-in oblique leg 42, built-in longeron 41 both sides and web 2 fuse, and constitute the space body structure.
It is flat curved that base plate rope 5 generally planar has, and with reference to shown in Figure 19, bends up at web 2 places and and web 2 vertical reinforcement firm welding at the transverse structure reinforcing bar of the built-in longeron 41 of base plate rope 5 stretch-draw anchor positions.Bigger in span centre L/2 cross section to the radial load in the 3L/8 section horizontal plane, this section will be strengthened especially at the transverse structure reinforcing bar of the built-in longeron 41 of base plate rope 5 stretch-draw anchor positions, on the interior beam 41 of base plate rope 5 stretch-draw anchor positions, horizontal ribs is set in case of necessity, is laterally applying transverse prestress on the ribs in case of necessity.
Bridge adopts the construction of Hanging Basket cast-in-place cantilever method, built-in longeron 41 and built-in oblique leg 42 can be cast-in-place with box girder segment cantilever together during construction, for alleviating Hanging Basket cantilever pouring weight, built-in longeron 41 and built-in oblique leg 42 also can be postponed a construction stage, and be cast-in-place on support or suspension bracket.
Claims (5)
1, a kind of built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate (1) and the web (2) that constitute the case beam, it is characterized in that: an oblique leg rigid-frame structure is set in variable cross-section box girder bridge case beam, and the oblique leg rigid-frame structure is made up of built-in longeron (41) and built-in oblique leg (42); Built-in longeron (41) is located at span centre base plate (1) respective beam high position in the case beam, and section base plate (1) and built-in longeron (41) combine together near span centre L/2 cross section to the 3L/8 cross section, built-in longeron (41) height and span centre base plate (1) consistency of thickness; Built-in oblique leg (42) one ends and built-in longeron (41) are connected as a single entity, its both sides and web (2) are connected as a single entity, built-in oblique leg (42) and case beam base plate (1) are arranged in parallel, built-in oblique leg (42) and base plate (1) radial distance are 1/4～1/5 of the total deck-molding H of fulcrum, built-in oblique leg (42), case beam base plate (1) and web (2) all adopt uniform section, and thickness is 40～60cm; Line is hanged in the linear employing of case beam base plate (1) lower edge, and clean ratio of rise to span is 1/7～1/9; Span centre positive bending moment base plate rope (5) is along built-in longeron (41) horizontal arrangement, on the built-in longeron (41) of base plate rope (5) stretch-draw anchor position, the sawtooth piece is set, base plate rope (5) stretch-draw anchor end is located to bend up in the case at sawtooth piece (3), and base plate rope (5) is in the symmetry stretch-draw of two anchored end and be anchored on the sawtooth piece (3).
2, built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that: described base plate rope (5) planar has flat curved, locates to bend up and and web (2) vertical reinforcement firm welding at web (2) at the transverse structure reinforcing bar of the built-in longeron (41) of base plate rope (5) stretch-draw anchor position.
3, built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 2 is characterized in that: to the 3L/8 section, on the built-in longeron (41) of base plate rope (5) stretch-draw anchor position horizontal ribs is set in span centre L/2 cross section.
4, built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 3 is characterized in that: apply transverse prestress on described horizontal ribs.
5, the described built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge job practices of a kind of claim 1, it is characterized in that: bridge adopts the construction of Hanging Basket cast-in-place cantilever method, cantilever is cast-in-place together for built-in longeron (41) and built-in oblique leg (42) and box girder segment during construction, or built-in longeron (41) and built-in oblique leg (42) construction stage of postponement, cast-in-place on support or suspension bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610167317XA CN100491638C (en) | 2006-12-27 | 2006-12-27 | Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610167317XA CN100491638C (en) | 2006-12-27 | 2006-12-27 | Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof |
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| Publication Number | Publication Date |
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| CN1974929A true CN1974929A (en) | 2007-06-06 |
| CN100491638C CN100491638C (en) | 2009-05-27 |
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| CNB200610167317XA Expired - Fee Related CN100491638C (en) | 2006-12-27 | 2006-12-27 | Built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015304A (en) * | 2013-01-09 | 2013-04-03 | 重庆交通大学 | 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 |
| CN103031804A (en) * | 2013-01-09 | 2013-04-10 | 重庆交通大学 | Slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge and construction method thereof |
| CN103132447A (en) * | 2013-01-09 | 2013-06-05 | 重庆交通大学 | Prestressed concrete variable cross-section box bridge and construction method thereof |
| CN108691265A (en) * | 2018-08-06 | 2018-10-23 | 中铁二院工程集团有限责任公司 | A kind of half-through arch bridge |
-
2006
- 2006-12-27 CN CNB200610167317XA patent/CN100491638C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015304A (en) * | 2013-01-09 | 2013-04-03 | 重庆交通大学 | 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 |
| CN103031804A (en) * | 2013-01-09 | 2013-04-10 | 重庆交通大学 | Slant leg rigid frame built-in prestressed concrete variable cross-section box girder bridge and construction method thereof |
| CN103132447A (en) * | 2013-01-09 | 2013-06-05 | 重庆交通大学 | Prestressed concrete variable cross-section box bridge and construction method thereof |
| CN103132447B (en) * | 2013-01-09 | 2015-03-18 | 重庆交通大学 | Prestressed concrete variable cross-section box bridge |
| CN103015304B (en) * | 2013-01-09 | 2015-05-20 | 重庆交通大学 | 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 |
| CN108691265A (en) * | 2018-08-06 | 2018-10-23 | 中铁二院工程集团有限责任公司 | A kind of half-through arch bridge |
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