CN102373671A - Steel trussed beam and flexible arch bridge construction method with vault pushing - Google Patents
Steel trussed beam and flexible arch bridge construction method with vault pushing Download PDFInfo
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- CN102373671A CN102373671A CN2011103660368A CN201110366036A CN102373671A CN 102373671 A CN102373671 A CN 102373671A CN 2011103660368 A CN2011103660368 A CN 2011103660368A CN 201110366036 A CN201110366036 A CN 201110366036A CN 102373671 A CN102373671 A CN 102373671A
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Abstract
The invention discloses a steel trussed beam and flexible arch construction method with vault pushing, which comprises the following steps of: building an assembly support in the side span of a steel trussed beam, assembling a guide beam and the steel trussed beam into an integral space on the assembly support, arranging a horizontal continuous jack and a mechanical, electrical and hydraulic control system on the assembly support, pushing the steel trussed beam forward by using the horizontal jack, and continuing next round of assembly work on the rear assembly support whenever one round is pushed forward. By using the steel trussed beam and flexible arch construction method with vault pushing provided by the invention, the steel trussed beam and the flexible arch are erected outside the operating limit of a highway, and the construction difficult across the highway is solved.
Description
Technical field
The present invention is specifically related to a kind of steel truss girder flexible arch bridge band vault and pushes away job practices, is specially adapted to the erection construction of the large-span continuous steel truss girder flexible arch bridge in crossing highway, railway, river, belongs to technical field of bridge construction.
Background technology
The steel truss girder flexible arch bridge is as a kind of structural shape of large-span steel purlin bridge, and it is big to have a vertical rigidity, and structure stress is clear and definite, modern design, and advantage such as architectural image is attractive in appearance is used in the bridge in some crossing highways, railway, river.Mostly the job practices of large-span steel trusses flexible arch bridge is that two-way free cantilever erection, centre close up and first beam rear arch method at present, according to its design feature, environmental factor, fringe conditions, selects construction supporting facility and erection equipment.
For a kind of large-span steel trusses flexible arch bridge (114.75m+229.5m+114.75m); Its main span 229.5m acrossing highway; 26 ° of circuit angles; Bridge type adopt lower support type, equal altitudes, continuously, rigidity trusses sliding roadway arch structure, bridge deck is formed by participating in the common stressed cross bridge floor board of main truss etc.Steel truss girder adopts space two purlin structures, girder space 15m, and the main truss facade adopts the N type English truss of band montant, the high 15.0m in purlin, panel length 12.75m.Flexible arch rib adopts circular curve, rise 45m, and ratio of rise to span is 1/4.5, arch rib adopts box-type section, high 1460～1860mm in the rod member, inner width 1100mm establishes vertically flat the couplet, and X-shape is arranged.Suspension rod adopts box-type section, rod member inner width 800mm, in high 1100mm, adopt the mode of four sides butt joint to be connected with the main truss node, the centre is not provided with stull, full-bridge is provided with 15 pairs of suspension rods altogether.The steel bridge material is mainly Q370qD and Q370qE, the about 11500t of gross weight.
Because speedway can not totally-enclosedly be constructed, in the middle of road, interim pier is set, because of small-angle skew extreme terrain condition also can't be implemented.Through overall merit to the two-way auxiliary cantilever of tower with suspended cable, the interim two-way auxiliary cantilever of pier and the interim unidirectional cantilever scheme of architecture of pier; Finally all to adopt first beam rear arch method; At arranged above expressway the large span sliding roadway arch is installed, technical sophistication, difficulty of construction is big; Security risk is high, mainly contains a following difficult problem:
1, the auxiliary unidirectional erecting steel truss girder of cantilever of interim pier is that a kind of construction operating mode and design conditions fit like a glove, and technical scheme is simple, less equipment investment, most economical scheme.But in the middle of speedway, interim pier is set continuously, can not passes through appraisal of traffic safety.
2, the auxiliary two-way cantilever span centre of interim pier closes up, need be in the speedway both sides shoulder work falsework large foundation, road and traffic safety can't guarantee.
3, the auxiliary two-way cantilever span centre of tower with suspended cable closes up, and in the speedway gauge, interim pier need be set, but tower with suspended cable is a kind of huge special equipment, complex structure, and cost is high.
4, above three kinds of schemes need be at arranged above expressway cantilever rod member, and it is complicated and changeable to relate to the road construction safety protection, is difficult to guarantee the operation security of speedway.
Also there is a following difficult problem in the constructure scheme that adopts incremental launching method to set up with first beam rear arch for a kind of large-span steel trusses sliding roadway arch:
1, because the steel bridge span is big, the downwarp that the steel truss girder deadweight causes reaches, should be linear through roof fall beam adjustment girder steel, must prevent steel girder member bar unstability and local overstressing again, and strengthening measure is complicated.
2, first beam rear arch span centre closes up scheme, need be in arranged above expressway 75m work high above the ground, and operation easier is big, and security risk is high.
3, select first beam rear arch arch springing to close up scheme, because the arch springing structural rigidity is big, it is big to satisfy the top power of closing up the condition needs, can cause girder steel part rod member overstressing.
Summary of the invention
The object of the present invention is to provide a kind of band vault to push away steel truss girder sliding roadway arch job practices, be implemented in speedway operation gauge and set up steel truss girder and sliding roadway arch outward, solve the construction difficult problem of acrossing highway.
Technical solution problem of the present invention provides following scheme:
A kind of steel truss girder flexible arch bridge band vault pushes away job practices, it is characterized in that:
(1) at first multispan steel truss formula assembling support is set at the consolidation shed of end bay master pier, again in stride main pier and the other pier-side bracket that is provided with of another end bay master pier, again in stride between main pier and the end bay master pier interim pier support be set again;
(2) secondly on assembling support, pier-side bracket, interim pier support, slipway beam and slide block are installed; On assembling support, pier-side bracket, interim pier support, the continuous jack of level, pushing tow system, slip bocks system and dynamo-electric hydraulic control system are installed simultaneously; Nose girder and steel truss girder are assembled into whole internode
(3) the steel truss girder nose girder is installed on assembling support, the steel truss girder of a round is installed on assembling support after the steel truss girder nose girder is accomplished again, and be linked to be integral body with steel nose girder;
(4) utilize on the steel truss girder multiple spot level jack synchronous push with steel truss girder pushing tow reach between a round again, carry out linear adjustment again, every pushing tow round of advancing continues the consolidation service of next round on the assembling support of rear portion;
(5) repeat 3～5 steps; Arrive the interim pier backing positions of main span span centre until the steel truss girder arch springing; When steel truss girder arch springing pushing tow to interim pier support top, above interim pier support, girder erection crane is installed, after the girder erection crane Installation and Debugging, go voluntarily and set up the sliding roadway arch rod member to the arching position; Sliding roadway arch is installed is simultaneously supported temporarily, form stabilising system;
(6) when a round sliding roadway arch was installed, at the steel truss girder of a round of the parallel installation of assembling support, when the sliding roadway arch system was not closed, steel truss girder band vault pushed away a round, carries out linear adjustment;
(7) repeat 6 steps; When the piece of constructing when sliding roadway arch is connected with steel truss girder; Utilization is installed in vertical jack on interim pier support jack-up steel truss girder upwards on side main pier; To reduce the opening value of closing up mouth between sliding roadway arch and the steel truss girder, realize that at the arch springing place arch closes up;
(8) continue the steel truss girder that remains internode is installed, push away in place until full-bridge band vault;
Unidirectional retreating is adopted in setting up of said sliding roadway arch; Said unidirectional retreating is: earlier with suspension rod, temporary supporting system, arch rib, the arch of an arch internode flat join set up finish, after the closure, a girder erection crane slow astern internode carries out a back erection method that encircles internode.
Said sliding roadway arch sets up, and also comprises setting up synchronously of sliding roadway arch temporary supporting system, and promptly suspension rod and interim strut are installed by elder generation, and the flat couplet of arch rib and arch rib is installed again; Suspension rod is rigidly connected with arch rib and steel truss girder respectively at two ends up and down, and temporary supporting system and suspension rod are rigidly connected.
Said assembling support, pier-side bracket and interim pier support are provided with slipway beam and slide block; The slipway beam end face is provided with the stainless steel slideway; Slider bottom is installed polyfluortetraethylene plate; Adopt the dilatory steel strand of level jack to realize the steel truss girder reach, adopt the vertical jack beam that rises and falls to carry out the slide block displacement before and after the pushing tow.
Advantage of the present invention:
1, outside speedway operation gauge, sets up steel truss girder and sliding roadway arch, solved the construction difficult problem of acrossing highway, guaranteed the traffic safety of speedway.
2, steel truss girder and sliding roadway arch can set up by synchronous push, have reduced to take the speedway service time, to guaranteeing the duration and controlling cost more favourable.
3, realize that in main pier top lifting the sliding roadway arch arch springing closes up; Top lifting power and top lifting shift value are little; Make full use of existing supporting facility and adjust the linear of steel truss girder, close up a mouthful opening value and can realize preparatory control, dissolved and closed up technical barriers such as technical sophistication, required precision is high, the work high above the ground difficulty is big.
4, utilize the long nose girder of 102m to dash in advance and stride, make the cantilever operating mode become the freely supported structure system, realize the whole stability under loading of steel truss girder, created advantage for the band vault pushes away.
5, concentrate in the consolidation service place, has realized the batch production assembly unit, has simplified technology, helps the best tissue of constructing and producing, to ensure the quality of products, improve work efficiency, reduce cost highly beneficial.
6, the band vault pushes away steel truss girder sliding roadway arch job practices technical feasibility, and safe and reliable, economical rationality has bigger promotional value.
Description of drawings
Fig. 1 assembling support structural representation.
Fig. 2 pier-side bracket structural representation.
The interim pier supporting structure of Fig. 3 main span span centre sketch map.
The horizontal pushing tow system schematic of Fig. 4.
Fig. 5 thrustor, slip bocks system and deviation correcting device are arranged sketch map I.
Fig. 6 thrustor, slip bocks system and deviation correcting device are arranged sketch map II.
Fig. 7 nose girder structural representation
Fig. 8 steel truss girder pushing tow is to the maximum cantilever sketch map.
During Fig. 9 arch springing pushing tow to the interim pier of span centre, begin to set up the sliding roadway arch sketch map.
Figure 10 sliding roadway arch not architectonical steel truss girder band vault pushes away sketch map.
Figure 11 realizes that the sliding roadway arch arch springing closes up sketch map.
Figure 12 sliding roadway arch architectonical steel truss girder band vault pushes away sketch map.
Figure 13 steel truss girder band vault pushes away sketch map in place.
The specific embodiment
Referring to accompanying drawing; Push away the condition calculating analysis according to the band vault; Must be provided with that steel bridge sets up and the falsework of incremental launching construction; At end bay master pier 200 consolidation sheds multispan assembling support 410 is set, in stride main pier 300 and another end bay master Dun200Chu is provided with pier-side bracket 420, span centre is provided with an interim pier support 430.
Assembling support 410 structures are as shown in Figure 1, and pier-side bracket 420 structures are as shown in Figure 2, and interim pier support 430 structures of main span span centre are as shown in Figure 3.Steel pipe post 402 bottoms are pile foundation cushion cap 401, connect with pipe truss 403 between the column, and cradle top surface is installed steel box structure slipway beam 405, slipway beam end weld horizontal jacking bracket 404.
At assembling support 410, pier collateral branch frame 420 and the interim pier support 430 of span centre the horizontal pushing tow of three covers system 510 is set altogether, arranges slip bocks system 520, horizontal deviation correcting device 530 and vertical jack 540 as required.
Horizontal pushing tow system 510 is made up of continuous horizontal jack 511, steel strand 512, controlling platform 513, hydraulic power unit 514, C type counter-force seat 515.Hydraulic power unit 514, continuous horizontal jack 511 provide horizontal jacking force, drag steel strand 512, through the C type counter-force seat that is connected with girder steel 515 horizontal thrust are passed to girder steel, realize the reach of girder steel.
The composition of slip bocks system 520 is as shown in Figure 5, and slide block 521 tops adopt billet 522 and girder steel to copy reality, realizes the camber of girder steel and transmits vertical force.Slide block 521 moves on the stainless steel slideway 524 of slipway beam 405 end faces, realizes the reach of girder steel.Slider bottom is established polyfluortetraethylene plate 523 and is contacted with stainless steel slideway 524.
Laterally deviation correcting device 530 provides horizontal correction jacking force through horizontal correction level top 531 and hydraulic power unit, and laterally correction level top 531 is arranged on slide block 521 and rectifies a deviation between the base 532, and correction level top 531 anti-top correction bases 532 realization girder steels are laterally rectified a deviation.
The distortion and the force transfer system of the external force during for the deadweight that solves suspension rod 130 and flexible arch rib 120 and pushing tow are guaranteed the safety and the stability of sliding roadway arch, and sliding roadway arch sets up and is with vault to push away in the process, suspension rod 130 in length and breadth between temporary supporting system 125 is set.
Claims (4)
1. a steel truss girder flexible arch bridge band vault pushes away job practices, it is characterized in that:
(1) at first multispan steel truss formula assembling support is set at the consolidation shed of end bay master pier, again in stride main pier and the other pier-side bracket that is provided with of another end bay master pier, again in stride between main pier and the end bay master pier interim pier support be set again;
(2) secondly on assembling support, pier-side bracket, interim pier support, slipway beam and slide block are installed; On assembling support, pier-side bracket, interim pier support, the continuous jack of level, pushing tow system, slip bocks system and dynamo-electric hydraulic control system are installed simultaneously, nose girder and steel truss girder are assembled into whole internode;
(3) the steel truss girder nose girder is installed on assembling support, the steel truss girder of a round is installed on assembling support after the steel truss girder nose girder is accomplished again, and be linked to be integral body with steel nose girder;
(4) utilize on the steel truss girder multiple spot level jack synchronous push with steel truss girder pushing tow reach between a round again, carry out linear adjustment again, every pushing tow round of advancing continues the consolidation service of next round on the assembling support of rear portion;
(5) repeat 3～5 steps; Arrive the interim pier backing positions of main span span centre until the steel truss girder arch springing; When steel truss girder arch springing pushing tow to interim pier support top, above interim pier support, girder erection crane is installed, after the girder erection crane Installation and Debugging, go voluntarily and set up the sliding roadway arch rod member to the arching position; Sliding roadway arch is installed is simultaneously supported temporarily, form stabilising system;
(6) when a round sliding roadway arch was installed, at the steel truss girder of a round of the parallel installation of assembling support, when the sliding roadway arch system was not closed, steel truss girder band vault pushed away a round, carries out linear adjustment;
(7) repeat 6 steps; When the piece of constructing when sliding roadway arch is connected with steel truss girder; Utilization is installed in vertical jack on interim pier support jack-up steel truss girder upwards on side main pier, to reduce the opening value of closing up mouthful between sliding roadway arch and the steel truss girder, realizes that at the arch springing place arch closes up;
(8) continue the steel truss girder that remains internode is installed, push away in place until full-bridge band vault.
2. push away job practices according to the said steel truss girder flexible arch bridge of claim 1 band vault; It is characterized in that: unidirectional retreating is adopted in setting up of said sliding roadway arch; Said unidirectional retreating is: earlier with suspension rod, temporary supporting system, arch rib, the arch of an arch internode flat join set up finish, after the closure, a girder erection crane slow astern internode carries out a back erection method that encircles internode.
3. push away job practices according to the said steel truss girder flexible arch bridge of claim 1 band vault, it is characterized in that: said sliding roadway arch sets up, and also comprises setting up synchronously of sliding roadway arch temporary supporting system, and promptly suspension rod and interim strut are installed by elder generation, and the flat couplet of arch rib and arch rib is installed again; Suspension rod is rigidly connected with arch rib and steel truss girder respectively at two ends up and down, and temporary supporting system and suspension rod are rigidly connected.
4. push away job practices according to the said steel truss girder flexible arch bridge of claim 1 band vault; It is characterized in that: said assembling support, pier-side bracket and interim pier support are provided with slipway beam and slide block; The slipway beam end face is provided with the stainless steel slideway; Slider bottom is installed polyfluortetraethylene plate, adopts the dilatory steel strand of level jack to realize the steel truss girder reach, adopts the vertical jack beam that rises and falls to carry out the slide block displacement before and after the pushing tow.
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Address after: 230022 No. 96 Wangjiang East Road, Hefei City, Anhui Province Co-patentee after: Steel structure building Co., Ltd. of the four Bureau of China Railway Patentee after: China Tiesiju Civil Engineering Group Co., Ltd. Address before: 230022 No. 96 Wangjiang East Road, Hefei City, Anhui Province Co-patentee before: Steel Structure Co., Ltd. of China Tiesiju Civil Engineering Group Patentee before: China Tiesiju Civil Engineering Group Co., Ltd. |