CN103147385B - Double-spliced extradosed cable-stayed bridge - Google Patents
Double-spliced extradosed cable-stayed bridge Download PDFInfo
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- CN103147385B CN103147385B CN201310079515.0A CN201310079515A CN103147385B CN 103147385 B CN103147385 B CN 103147385B CN 201310079515 A CN201310079515 A CN 201310079515A CN 103147385 B CN103147385 B CN 103147385B
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Abstract
The invention discloses a double-spliced extradosed cable-stayed bridge which is formed by double splicing and widening of single-cable-plane extradosed cable-stayed bridges. A construction method of the double-spliced extradosed cable-stayed bridge comprises the steps that one single-cable-plane extradosed cable-stayed bridge is constructed to serve as a half frame of a new bridge; the other single-cable-plane extradosed cable-stayed bridge is constructed to serve as the other half frame of the new bridge; and the two single-cable-plane extradosed cable-stayed bridges are spliced to form the double-cable-plane (wide-width) double-spliced extradosed cable-stayed bridge. The double-spliced extradosed cable-stayed bridge is designed integrally and constructed by stages, so that pressure of construction investment can be relieved; a requirement of traffic volume increase can be met; and for reconstructing or expanding an old bridge, a requirement of no traffic interruption during a construction period can be met.
Description
Technical field
The invention belongs to the technical field of Transportation Infrastructure Construction, be specifically related to a kind of double combined low-pylon cable-stayed bridge.
Background technology
Low-pylon cable-stayed bridge is also known as partial cable-stayed bridge, it has the structural advantages of cable stayed bridge and cantilever variable cross-section prestressed concrete continuous beam two kinds of bridge types concurrently, there is larger rigidity and lower bridge tower height, bridge type is attractive in appearance, span ability is large, at 100-300 rice across having very strong competitiveness within the scope of footpath, it is a kind of bridge-type structure having very much development potentiality.Nearly ten years, its development speed is particularly swift and violent, and in worldwide, existing nearly hundred low-pylon cable-stayed bridges build up, and wherein have more than 50 seats domestic in China.Shi Wenjie is in " low-pylon cable-stayed bridge develop and practice at home and abroad " (" Modern Transportation Technology " the 3rd phase P22-25 in 2012) literary composition, describe low-pylon cable-stayed bridge developing history at home and abroad, summarize its design feature, and given at present built or at the case history of domestic, the external low-pylon cable-stayed bridge of the part of building.
The structural system of low-pylon cable-stayed bridge mainly contains two large types: tower beam pier consolidation system, and tower beam consolidation, tower pier separation system.
Low-pylon cable-stayed bridge loading characteristic: its stress performance is between beam bridge and cable stayed bridge.Low-pylon cable-stayed bridge with girder by curved, pressurized, cut and jointly born vertical load with Suo Shoula, the external tendon of suspension cable more as girder from stress characteristic, bears fractional load, plays distortion to girder.Suspension cable only shares fractional load, also have most load by beam by curved, cut and born.Its girder rigidity is comparatively large, and not only by axial compression, also will bear the bending and shearing of considerable part, its stressed division of labor has more selective.
Low-pylon cable-stayed bridge is based on beam stress, and with Suo Weifu, girder and bridge tower rigidity are comparatively large, and can be designed to the stress system of various structural system, supporting system and different parameters artificially, the dynamic characteristics of each this type bridge is not quite similar.
Low-pylon cable-stayed bridge, as a kind of emerging combined system bridge construction form, has the feature of cable stayed bridge and non-uniform continuous beam bridge concurrently." cable stayed bridge building technology " (People's Transportation Press's publication and distribution) P52 that Chen Mingxian writes gives low-pylon cable-stayed bridge and has following characteristics: 1, tower is shorter, tower height is 1/8-1/12 with the ratio of span, and the tower height of conventional cable stayed bridge is 1/4-1/5 with the ratio of span; 2, the non-stayed cable segment of beam is longer, does not hold anchor cable; 3, the ratio of end bay and main span is comparatively large, is generally greater than 0.5; 4, deck-molding is comparatively large, and rise-span ratio is 1/30-1/40, often makes And of Varying Depth beam; 5, drag-line is less than 30% to vertical permanent mobile load share rate, stressed with Liang Weizhu, Suo Weifu; 6, the stress variation of suspension cable is less, can design by external prestressing tendon.
Low-pylon cable-stayed bridge is divided into single cable plane, Shuan Suomian (being divided into again vertical and oblique), three rope face 3 types by the setting in Cable face.When adopting single cable plane, drag-line is antitorque inoperative to girder, and girder should adopt the cross section that torsional rigidity is larger.The advantage of single cable plane is broad view on bridge floor.When adopting two rope face, the moment of torsion acted on bridge can be resisted by the axle power of drag-line, and girder can adopt the cross section of less torsional rigidity.As for oblique pair of rope face, it is to bridge floor beam body opposing wind-force torsional oscillation advantageous particularly (oblique pair of rope face limits the teeter of girder).When adopting three rope faces, except there is the action character in two rope face, also bridge can be built up wide cut bridge.
Low-pylon cable-stayed bridge is divided into single cable plane low-pylon cable-stayed bridge, two rope faces low-pylon cable-stayed bridge, two rope faces wide cut low-pylon cable-stayed bridge, three rope face low-pylon cable-stayed bridges, four rope face low-pylon cable-stayed bridges by the layout in bridge width and rope face.
The structural meterials classification that low-pylon cable-stayed bridge adopts according to the case beam of its girder, can be divided into the hybrid beam structure of prestressed reinforced concrete construction, steel work, Steel concrete, Wavelike steel webplate structure etc.
The U.S. commemorates in new Pearl Harbor that bridge is double tower three rope face low-pylon cable-stayed bridge, full-bridge beam overall 33.70 meters.The view water channel cable stayed bridge single width bridge that Yinchuan of Ningxia Province Chinese mugwort leans on river is wide 60 meters, is the widest low-pylon cable-stayed bridge of single width built in the world at present.
Background engineering---Qi Liang road, the Danyang, Jiangsu Province Jing-Hang Canal Bridge that the people such as Yang Shulan are mentioned in " wide cut low-pylon cable-stayed bridge aseismic analysis and design " (" highway communication technological applications technology version " the 12nd phase P257-261 in 2012) literary composition, main bridge is (70+120+70) meter Shuan Ta two rope faces prestressed concrete low-pylon cable-stayed bridges, overall employing tower beam consolidation, the form that Dun Liang is separated, girder adopts two case beam to add crossbeam combined system, bridge floor overall with 43 meters, adopt integral type section, king-tower (i.e. drag-line district) is located at side and is divided band, be two-way 6 tracks in the middle of double tower, be nonmotorized vehicle lane and sidewalk outside double tower.This bridge adopts two case beam to add crossbeam combined system, forms integral type section, constitutes the Space Beam lattice pattern of " two case beam+in virtual longeron (bridge deck)+crossbeam ".This bridge has the outward appearance of Two bors d's oeuveres single cable plane low-pylon cable-stayed bridge Cheng Qiaohou.
The 205 western circle highway Jing-Jin Metropolis in Huai'an, national highway Jiangsu Province, this bridge system single cable plane low-pylon cable-stayed bridge, adopt single case three chamber beam, two-way 6 tracks, its cross section consists of: 12.50 meters, railing 0.50 meter+fast traffic lane (marginal strip 0.50 meter+runway 3.75 meters of * 3+marginal strips 0.75 meter)+Intermediate Gray 2.50 meters (the 1.50 meters+guardrail in guardrail 0.50 meter+Sarasota district 0.50 meter) 12.50 meters ,+fast traffic lane (marginal strip 0.75 meter+runway 3.75 meters of * 3+ marginal strips 0.50 meter) 0.50 meter ,+railing.Bridge floor beam overall 28.50 meters.
Quanzhou City of Fujian Province Jinjiang River Bridge girder adopts high performance ferrocement laminate double wave wave lenticular beam body new technology, and effectively resisting the attack of typhoon and prevent bridge from producing eddy current resonance, is domestic initiation.Arrange between its main structure of a bridge two casees beams
connecting cross beam, thus making width of main beam reach 38 meters, its crossbeam connected mode is worth using for reference.
Summary of the invention
The object of the invention is to: a kind of double combined low-pylon cable-stayed bridge is provided, it single cable plane low-pylon cable-stayed bridge is carried out two rope faces wide cut low-pylon cable-stayed bridge that Two bors d's oeuveres widens, be applicable to disposable integral planning and designing and widen the highway compared with Long span (or city) bridge constructed and implemented by stages, or for utilizing old bridge position to change the economically viable bridge construction scheme that when (expansion) builds new bridge, half range construction half range is open to traffic.
Technical solution of the present invention is: this double combined low-pylon cable-stayed bridge carries out Two bors d's oeuveres by single cable plane low-pylon cable-stayed bridge and widens and form, namely after first being become by a single cable plane low-pylon cable-stayed bridge bridge also to use, again another adjacent single cable plane low-pylon cable-stayed bridge is carried out main body according to construction sequential to close up, then between the case beam of two single cable plane low-pylon cable-stayed bridges, arranging crossbeam makes it be rigidly connected, last cast-in-place bridge deck, leveling layer making bridge floor; For newly-built double combined low-pylon cable-stayed bridge, its construction method first builds the half range of a single cable plane low-pylon cable-stayed bridge as new bridge, leading use, after build the another half range of another single cable plane low-pylon cable-stayed bridge as new bridge again according to construction sequential, finally the splicing of two single cable plane low-pylon cable-stayed bridges is become the double combined low-pylon cable-stayed bridge of Shuan Suomian (wide cut); Double combined low-pylon cable-stayed bridge is built up for old bridge being changed (expansion), its construction method first builds the half range of a single cable plane low-pylon cable-stayed bridge as new bridge in old bridge side, leading use, build the another half range of another single cable plane low-pylon cable-stayed bridge as new bridge after removing old bridge again, finally two single cable plane low-pylon cable-stayed bridge splicings are become the double combined low-pylon cable-stayed bridge of Shuan Suomian (wide cut).
Wherein, the structural system of single cable plane low-pylon cable-stayed bridge adopts tower beam consolidation, tower pier separation system, and the Dun Ding below tower and beam arranges pot bearing, selects prestressed concrete box girder or steel box-girder.
Wherein, splicing between two single cable plane low-pylon cable-stayed bridges adopts reinforced concrete beams to be rigidly connected (prestressed concrete box girder also can be taked to be rigidly connected as crossbeam), namely between the case beam of two single cable plane low-pylon cable-stayed bridges, set up crossbeam, with suspension cable draw the diaphragm in case beam (beam), pier head piece, end floor beam to be rigidly connected.
Wherein, horizontally-spliced step: when the case beam employing prestressed concrete box girder of single cable plane low-pylon cable-stayed bridge, the pier head piece of single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables the side of widening of diaphragm (beam) of hanging in the case beam that draws preset lap joint, crossbeam is set up between the case beam of two single cable plane low-pylon cable-stayed bridges, crossbeam prefabricate and install cast-in-place wet joint or cast-in-site of bracket is set, the pier head piece of crossbeam and single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables the diaphragm (beam) hung in the case beam that draws be rigidly connected; Its sequence of construction is the same with the sequence of construction of girder case beam, first implements and crossbeam No. 0 beam corresponding to the block case beam of No. 0, pier top, after symmetrically successively to implement and No. 1 (1 '), No. 2 (2 '), No. 3 (3 ') block case beams ... corresponding crossbeam; As taked prestressed concrete box girder as crossbeam, prestress pipe should be preset, in order to apply transverse prestress in diaphragm (beam) in case beam and the crossbeam set up; Finally cast-in-place bridge deck, leveling layer on crossbeam, its sequence of construction is with reference to the sequence of construction of crossbeam; When the case beam employing steel box-girder of single cable plane low-pylon cable-stayed bridge, between the steel box-girder of two single cable plane low-pylon cable-stayed bridges, set up gooseneck, between steel box-girder and gooseneck, adopt bolt-weld joint.
Wherein, the bridge deck width of this double combined low-pylon cable-stayed bridge regulates by the length of the crossbeam set up between two casees beams, makes two rope faces wide cut low-pylon cable-stayed bridge.
Wherein, after between two single cable plane low-pylon cable-stayed bridges, employing is rigidly connected and splices, single cable plane low-pylon cable-stayed bridge cooperating measure is two rope faces low-pylon cable-stayed bridge structures, and the girder between two rope face is transformed to Space Beam lattice structure stress system by Space Double cantilever construction stress system; According to the main beam stress state before and after stress system conversion and stressed size thereof during design, draft each spot size of girder and Reinforcement Design and checking computations are carried out to it.
Wherein, be designed to by the deck transverse slope of the single cable plane low-pylon cable-stayed bridge as new bridge half range first built while be 2% slope another side be flat slope (spelling wide side), being designed to by the deck transverse slope of the single cable plane low-pylon cable-stayed bridge as the another half range of new bridge of rear construction be flat slope (spelling wide side) another side is 2% slope; Bridge floor flat slope between the two rope faces formed after Two bors d's oeuveres single cable plane low-pylon cable-stayed bridge is adjusted to 2% two-way horizontal wall inscription by cast-in-place leveling layer, and the vertical error eliminating the case top surface of the beam (splicing side) of two single cable plane low-pylon cable-stayed bridges is arranged, and adopts the cast-in-situ concrete of 10-20 centimetres.
Wherein, the pot bearing of the pile foundation of bridge, pier and pier top comes overall control design or type selecting by two rope face (wide cut) low-pylon cable-stayed bridge structural behavior, and (or framing) is constructed and implemented by stages.
Wherein, when adopt prestressed concrete box girder carry out " two case beam+crossbeam " splice connection construction time, maybe when adopting steel box-girder to carry out splicing (welding or high-strength bolt connect) the construction connection of " two steel box-girder+gooseneck ", impact when construction period, traffick was spelled wide on bridge construction construction all should be considered, take vehicle to detour and minor interruptions traffic plan temporarily, or take the cast-in-place early strength concrete of crossbeam, to shorten the duration that bridge construction spells wide construction.
The present invention has the following advantages:
1, global design, (framing) is implemented by stages; Be applicable to highway (or city) bridge of disposable integral planning and designing and built by separate periods enforcement, the investment pressure of one-time construction can be alleviated, and meet the demand of traffic volume growth; For old bridge reconstruction and extension project, the expense setting up make-shift bridge can be saved, and meet construction period half range construction half range pass through and the demand of uninterrupted traffic.
2,cloth is across flexibly, rational in infrastructure; Main span can be selected between 100-200 rice, even can select more Long span; Can lay single tower double-span, double tower three across or the bridge of multitower multispan continuous structure, this class formation has that bridge tower is short, girder is short, large across footpath, bridge floor is wide, by stages (width) distinguishing feature such as to build, structure stress is reasonable.
3,adopting " two case beam+crossbeam " to splice link technique, built by separate periods Two bors d's oeuveres bridge after first global design, is a kind of innovative approach of bridge construction technology.
4,two bors d's oeuveres single cable plane low-pylon cable-stayed bridge is easy to be formed two rope face (wide cut) low-pylon cable-stayed bridge, and the bridge floor overall width of Two bors d's oeuveres single cable plane low-pylon cable-stayed bridge is more than 2 times of the bridge floor overall width of single cable plane low-pylon cable-stayed bridge, is to build scheme first choice of wide cut bridge.
5,spell two (two rope faces low-pylon cable-stayed bridge) with list (single cable plane low-pylon cable-stayed bridge), easy construction; Crossbeam between the case beam of girder and two casees beams can adopt the cast-in-place method of suspension bracket or adopt precast spliced method to construct, technical maturity, becomes bridge convenient.
6,bridge type is attractive in appearance, good economy performance; Double combined low-pylon cable-stayed bridge plastic simplicity smoothness, bridge floor broad view, bridge type are lightly attractive in appearance, and such cost compared with Large Span Bridges is lower than Hanging Basket cantilever prestress concrete variable cross-section Continuous Box Girder Bridge, cable stayed bridge and suspension bridge.
Accompanying drawing explanation
Fig. 1 is the main bridge elevational schematic view of Qi Liang road, Danyang, Jiangsu Province Jing-Hang Canal Bridge.
Fig. 2 is Qi Liang road, Danyang, Jiangsu Province Jing-Hang Canal Bridge main bridge layout schematic diagram.
Fig. 3 is Qi Liang road, Danyang, Jiangsu Province Jing-Hang Canal Bridge main bridge optimal crosssection schematic diagram.
Fig. 4 is 205 Huai'an, national highway Jiangsu Province western circle highway Jing-Jin Metropolis elevational schematic view.
Fig. 5 is 205 Huai'an, national highway Jiangsu Province western circle highway Jing-Jin Metropolis layout schematic diagrames.
Fig. 6 is 205 Huai'an, national highway Jiangsu Province western circle highway Jing-Jin Metropolis optimal crosssection schematic diagrames.
Fig. 7 is double combined low-pylon cable-stayed bridge optimal crosssection schematic diagram of the present invention.
Detailed description of the invention
As shown in Figure 7, this double combined low-pylon cable-stayed bridge can carry out Two bors d's oeuveres by single cable plane low-pylon cable-stayed bridge and widens and form; Namely first by a single cable plane low-pylon cable-stayed bridge Cheng Qiaohou, again another adjacent single cable plane low-pylon cable-stayed bridge is carried out main body according to construction sequential to close up, then between the case beam of two single cable plane low-pylon cable-stayed bridges, arranging crossbeam makes it be rigidly connected, last cast-in-place bridge deck, leveling layer making bridge floor; For newly-built double combined low-pylon cable-stayed bridge, its construction method first builds the half range of side single cable plane low-pylon cable-stayed bridge as new bridge, build the another half range of opposite side single cable plane low-pylon cable-stayed bridge as new bridge again, finally two single cable plane low-pylon cable-stayed bridge splicings are become the double combined low-pylon cable-stayed bridge of Shuan Suomian (wide cut); Double combined low-pylon cable-stayed bridge is become for by old bridge reorganization and expansion, its construction method first builds the half range of a single cable plane low-pylon cable-stayed bridge as new bridge in old bridge side, build the another half range of another single cable plane low-pylon cable-stayed bridge as new bridge after removing old bridge again, finally two single cable plane low-pylon cable-stayed bridge splicings are become the double combined low-pylon cable-stayed bridge of Shuan Suomian (wide cut).
Wherein, the structural system of single cable plane low-pylon cable-stayed bridge adopts tower beam consolidation, tower pier separation system, and the Dun Ding below tower and beam arranges pot bearing, selects prestressed concrete box girder or steel box-girder.
Wherein, splicing between two single cable plane low-pylon cable-stayed bridges adopts reinforced concrete beams to be rigidly connected (also can adopt prestressed concrete box girder as crossbeam), namely between the case beam of two single cable plane low-pylon cable-stayed bridges, set up crossbeam, with suspension cable draw the diaphragm in case beam (beam), pier head piece, end floor beam to be rigidly connected.
Wherein, horizontally-spliced step: when the case beam employing prestressed concrete box girder of single cable plane low-pylon cable-stayed bridge, the pier head piece of single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables the side of widening of diaphragm (beam) of hanging in the case beam that draws preset lap joint, between the case beam of two single cable plane low-pylon cable-stayed bridges, set up crossbeam, the pier head piece of crossbeam and single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables the diaphragm (beam) hung in the case beam that draws carry out being rigidly connected of cast-in-site of bracket steel concrete; Or prefabricate and install the crossbeam of cast-in-place wet joint, its sequence of construction is the same with the sequence of construction of girder case beam, first implement and crossbeam No. 0 beam corresponding to the block case beam of No. 0, pier top, after symmetrically successively to implement and No. 1 (1 '), No. 2 (2 '), No. 3 (3 ') block case beams ... corresponding crossbeam; During as adopted prestressed concrete box girder as connecting cross beam, prestress pipe should be preset, in order to apply transverse prestress in diaphragm (beam) in case beam and the crossbeam set up; Finally cast-in-place bridge deck, leveling layer on crossbeam, its sequence of construction is with reference to the sequence of construction of crossbeam; When the case beam employing steel box-girder of single cable plane low-pylon cable-stayed bridge, between the steel box-girder of two single cable plane low-pylon cable-stayed bridges, set up gooseneck, between steel box-girder and gooseneck, adopt bolt-weld joint.
Double combined low-pylon cable-stayed bridge is implemented by following concrete steps:
(1) according to double combined low-pylon cable-stayed bridge scheme, namely two rope faces wide cut low-pylon cable-stayed bridge disposable integral is planned and is designed plan new (changing) and builds highway (or city) bridge;
(2) for newly building bridge engineering, first implement the single cable plane low-pylon cable-stayed bridge in the half range bridge of double combined low-pylon cable-stayed bridge, adopt single case three Room (or multicell) case beam, Hanging Basket cantilever method or prefabricated cantilever method to construct, the other half range bridge of double combined low-pylon cable-stayed bridge needs built by separate periods to implement according to traffic volume growth etc.;
(3) for old bridge reconstruction and extension project, the single cable plane low-pylon cable-stayed bridge in the half range bridge of double combined low-pylon cable-stayed bridge is first implemented in old bridge side, adopt single case three Room (or multicell) case beam, Hanging Basket cantilever method or prefabricated cantilever method to construct, become after bridge open to traffic until it and remove old bridge again;
(4) according to the needs widening bridge, widen the single cable plane low-pylon cable-stayed bridge in the another half range bridge implementing double combined low-pylon cable-stayed bridge, same single case three Room (or multicell) case beam, Hanging Basket cantilever method or the prefabricated cantilever method of adopting is constructed;
(5) between two casees beams, implement connecting cross beam, adopt the cast-in-place method of suspension bracket or the construction of prefabricate and install method, complete by the conversion of single cable plane low-pylon cable-stayed bridge structure to the bridge construction stress system of two rope face (wide cut) low-pylon cable-stayed bridge structure;
(6) on completed connecting cross beam, adopt support formwork cast-in-situ steel reinforced concrete bridge deck, leveling layer making bridge floor, two of time phasing single cable plane low-pylon cable-stayed bridges are combined into two rope face (wide cut) low-pylon cable-stayed bridge.
Two bors d's oeuveres is carried out for the 205 western circle highway Jing-Jin Metropolis in Huai'an, national highway Jiangsu Province, two-way 8 tracks are established in the middle of double tower, slow lane and sidewalk is established outside double tower, then the cross section of its double combined wide cut low-pylon cable-stayed bridge consists of: 5.00 meters+slow lane, 7.50 meters+side, railing 0.50 meter+sidewalk divides 2.50 meters, band (the 1.50 meters+guardrail in guardrail 0.50 meter+Sarasota district 0.50 meter) 12.50 meters ,+fast traffic lane (marginal strip 0.50 meter+runway 3.75 meters of * 3+marginal strips 0.75 meter)+12.50 meters, BRT8.00 rice+fast traffic lane, bus rapid transit road (marginal strip 0.75 meter+runway 3.75 meters of * 3+marginal strips 0.50 meter)+side to divide 2.50 meters, band (the 1.50 meters+guardrail in guardrail 0.50 meter+Sarasota district 0.50 meter) 0.50 meter, the 5.00 meters+railing in+slow lane 7.50 meters+sidewalk.Bridge floor beam overall 64.00 meters.
Claims (9)
1. double combined low-pylon cable-stayed bridge,
carry out Two bors d's oeuveres by single cable plane low-pylon cable-stayed bridge to widen and form,the structural system of single cable plane low-pylon cable-stayed bridge adopts tower beam consolidation, tower pier separation system, and the Dun Ding below tower and beam arranges pot bearing, selects prestressed concrete box girder or steel box-girder; Splicing between two single cable plane low-pylon cable-stayed bridges adopts
reinforced concrete beamscarry out
be rigidly connected, or take
prestressed concrete box girder is as crossbeamcarry out
be rigidly connected; It is characterized in that: first by a single cable plane low-pylon cable-stayed bridge Cheng Qiaohou, again another adjacent single cable plane low-pylon cable-stayed bridge is carried out main body according to construction sequential to close up, then between the case beam of two single cable plane low-pylon cable-stayed bridges, arranging crossbeam makes it be rigidly connected, last cast-in-place bridge deck, leveling layer making bridge floor; For newly-built double combined low-pylon cable-stayed bridge, its construction method first builds the half range of a single cable plane low-pylon cable-stayed bridge as new bridge, build the another half range of another single cable plane low-pylon cable-stayed bridge as new bridge again, finally two single cable plane low-pylon cable-stayed bridge splicings are become the double combined low-pylon cable-stayed bridge of two rope faces wide cut; Double combined low-pylon cable-stayed bridge is become for by old bridge reorganization and expansion, its construction method first builds the half range of a single cable plane low-pylon cable-stayed bridge as new bridge in old bridge side, become after bridge open to traffic until it, remove old bridge again and build the another half range of another single cable plane low-pylon cable-stayed bridge as new bridge, finally two single cable plane low-pylon cable-stayed bridge splicings are become the double combined low-pylon cable-stayed bridge of two rope faces wide cut.
2. double combined low-pylon cable-stayed bridge according to claim 1, is characterized in that: between the case beam of two single cable plane low-pylon cable-stayed bridges, set up crossbeam, with suspension cable draw the diaphragm in case beam, pier head piece, end floor beam to be rigidly connected.
3. double combined low-pylon cable-stayed bridge according to claim 2, it is characterized in that described horizontally-spliced step is as follows: when the case beam employing prestressed concrete box girder of single cable plane low-pylon cable-stayed bridge, at the pier head piece of single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables the side of widening of diaphragm of hanging in the case beam that draws preset lap joint, crossbeam is set up between the case beam of two single cable plane low-pylon cable-stayed bridges, crossbeam prefabricate and install cast-in-place wet joint or cast-in-site of bracket, the pier head piece of crossbeam and single cable plane low-pylon cable-stayed bridge, end floor beam and all suspension cables hang in the case beam that draws to set up reinforced concrete beams between diaphragm be rigidly connected, or adopt prestressed concrete box girder to be rigidly connected as crossbeam, its sequence of construction is the same with the sequence of construction of girder case beam, first implement and crossbeam No. 0 beam corresponding to the block case beam of No. 0, pier top, after implement successively with No. 1 block case beam and symmetrical crossbeam No. 1 beam corresponding to 1 ' number block case beam and 1 ' number beam, with crossbeam No. 2 beams corresponding to 2 ' number block case beam of No. 2 block case beams and symmetry and 2 ' number beam, with crossbeam No. 3 beams corresponding to 3 ' number block case beam of No. 3 block case beams and symmetry and 3 ' number beam, the like, with the crossbeam N beam corresponding to N block case beam and N ' number symmetrical block case beam and N ' number beam, when adopting prestressed concrete box girder as connecting cross beam, prestress pipe should be preset, in order to apply transverse prestress in diaphragm in case beam and the crossbeam set up, finally cast-in-place bridge deck, leveling layer on crossbeam, its sequence of construction is with reference to the sequence of construction of crossbeam, when the case beam employing steel box-girder of single cable plane low-pylon cable-stayed bridge, between the steel box-girder of two single cable plane low-pylon cable-stayed bridges, set up gooseneck, between gooseneck and gooseneck, adopt bolt-weld joint.
4. double combined low-pylon cable-stayed bridge according to claim 3, is characterized in that: adopt two case beam to add crossbeam combined system, thus form integral type section, constitute
" two case beam+in virtual longeron and bridge deck+middle cross beam+bis-cantilever " structurespace Beam lattice pattern.
5. double combined low-pylon cable-stayed bridge according to claim 2, is characterized in that: the length of the bridge deck width crossbeam set up between two casees beams of double combined low-pylon cable-stayed bridge regulates, and makes two rope faces wide cut low-pylon cable-stayed bridge.
6. double combined low-pylon cable-stayed bridge according to claim 2, is characterized in that: adopt after being rigidly connected and splicing between two single cable plane low-pylon cable-stayed bridges, and single cable plane low-pylon cable-stayed bridge cooperating measure be pair rope faces low-pylon cable-stayed bridge structures, the girder of bridge by "
single case beam+bis-cantilever "structure stress system transition becomes "
two case beam+in virtual longeron and bridge deck+middle cross beam+bis-cantilever "space Beam lattice structure stress system, according to stress system
conversionthe main beam stress state of front and back and stressed size thereof, draft each spot size of girder and carry out Reinforcement Design and checking computations to it.
7. double combined low-pylon cable-stayed bridge according to claim 2, it is characterized in that: the bridge floor flat slope between the two rope faces formed after Two bors d's oeuveres single cable plane low-pylon cable-stayed bridge is adjusted to 2% two-way horizontal wall inscription by cast-in-place leveling layer, eliminate the vertical error of the splicing side end face of the case beam of two single cable plane low-pylon cable-stayed bridges, take the cast-in-situ concrete of 10-20 cm thick.
8. double combined low-pylon cable-stayed bridge according to claim 2, it is characterized in that: the pot bearing of the pile foundation of bridge, pier and pier top comes overall control design or type selecting by two rope faces wide cut low-pylon cable-stayed bridge structural behavior, by stages or framing construct and implement.
9. double combined low-pylon cable-stayed bridge according to claim 2, it is characterized in that: when adopting steel box-girder, when the construction that the welding or high-strength bolt of carrying out " two steel box-girder+gooseneck " connect, maybe when adopting prestressed concrete box girder, when carrying out " two case beam+crossbeam " splicing connection and cast-in-situ steel reinforced concrete construction of beam, impact when construction period, traffick was spelled wide on bridge construction construction all should be considered, take vehicle to detour and minor interruptions traffic plan temporarily, or adopt the cast-in-place early strength concrete of crossbeam, to shorten the duration that bridge construction spells wide construction.
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| CN104532733B (en) * | 2014-12-23 | 2017-05-17 | 上海市城市建设设计研究总院（集团）有限公司 | Partial cable-stayed bridge of fish bone beam structure |
| CN107119583A (en) * | 2017-06-14 | 2017-09-01 | 沈阳建筑大学 | A kind of T-shaped rigid frame bridge back of the body tower oblique pull ruggedized construction of double width and its construction method |
| CN108589508A (en) * | 2018-05-16 | 2018-09-28 | 李明 | A kind of double combined combined bridge structure |
| CN109024319B (en) * | 2018-09-21 | 2023-12-15 | 湖北省交通规划设计院股份有限公司 | Low-tower cable-stayed bridge reinforcing structure of double-amplitude continuous rigid frame bridge and construction method |
| CN110093845A (en) * | 2019-04-17 | 2019-08-06 | 中国公路工程咨询集团有限公司 | A kind of only tower steel box girder stayed-cable bridge and its method of construction of anti-near field macroseism |
| CN112695652B (en) * | 2020-12-17 | 2022-11-08 | 安徽省交通控股集团有限公司 | Web-shaped suspender arch bridge framing construction method for highway reconstruction and extension project |
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