CN103741601B - Tower, beam and cable synchronous bridge forming technology - Google Patents

Tower, beam and cable synchronous bridge forming technology Download PDF

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CN103741601B
CN103741601B CN201310267789.2A CN201310267789A CN103741601B CN 103741601 B CN103741601 B CN 103741601B CN 201310267789 A CN201310267789 A CN 201310267789A CN 103741601 B CN103741601 B CN 103741601B
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construction
tower
cable
bridge
king
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CN201310267789.2A
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CN103741601A (en
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郑建平
张新炜
吕显鸫
张光亮
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中交第三航务工程局有限公司
中交第三航务工程局有限公司厦门分公司
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Abstract

The invention discloses a tower, beam and cable synchronous bridge forming technology. According to the technology, main tower creeping formwork construction, steel box beam cantilever assembly, side span concrete box beam cast-in-place support construction and stay cable and hung cable stretch-draw construction are conducted alternately and synchronously. The tower, beam and cable synchronous bridge forming technology achieves safe and reliable full-bridge construction.

Description

A kind of tower, beam and rope synchronously become bridge technique

Technical field

The present invention relates to architectural construction technology is and in particular to a kind of bridge construction technique.

Background technology

Cable-stayed bridge, also known as Cable stayed bridge, is a kind of bridge being directly pulled in girder many drag-lines on bridge tower, is by pressure-bearing Tower, the rope of tension and hold a kind of structural system that curved beam body combines.It is considered as the multispan that drag-line replaces buttress Elastic support continuous beam.It can make moment of flexure in beam body reduce, and reduce building height, alleviate construction weight, save material.Tiltedly Bridge is drawn to be made up of Sarasota, girder, suspension cable.

Cable-stayed bridge is as a kind of guy system, bigger than the span ability of beam bridge, is the main bridge of Longspan Bridge Type.Cable-stayed bridge is that the wirerope being directly connected on tower by many is sling bridge floor, and cable-stayed bridge is made up of Sarasota, girder, suspension cable.Rope Tower formula has a type, the type of falling y, H type, only post, and material has steel and concrete.Suspension cable be disposed with single cable plane, the parallel pair of rope face, Oblique cord face etc..

Tiltedly solely tower single cable plane mixing girder stayed-cable bridge as one kind of cable-stayed bridge, it has following construction featuress:

1st, bridge general layout

Span arrangement is (60+65+220) m, the long 345m of bridge.End bay sets an auxiliary pier.Suspension cable presses single cable plane arrangement, Two skew cables are arranged in each rope face.Wherein, to rope, main span arrangement 15 is to rope for end bay arrangement 8;Side, main span rope are away from being 12.0m.

2nd, Sarasota construction

King-tower is arranged in median strip, using reinforced concrete structure, box section, 75 ° of longitudinal inclination.Tower height About 98m(is more than bridge floor), tower top elevation is+123.377m.

3rd, structural system

Structure of main bridge system is tower, beam, pier consolidation system, and abutment pier and auxiliary pier constrain horizontal displacement of the lines, release vertical line Displacement.Easy construction, after the completion of need not carry out system transform, only increase temperature stresses more.

For this tiltedly only tower single cable plane mixing girder stayed-cable bridge with unique texture, which kind of one-tenth bridge technique this is become using The problem of field urgent need to resolve.The construction technology commonly used for cable-stayed bridge generally comprises the first tower back rest and becomes tower after bridge technique, first beam Become bridge technique, this become bridge technique solely tower single cable plane mixing girder stayed-cable bridge of constructing tiltedly all to have a lot of asking using both Topic:

1st, first tower back rest construction

For the consideration of secure context, straight pylon cable-stayed bridge is usually the sequence construction pressing the first tower back rest.But for inclination tower The construction of post, the cantilever construction of reply king-post is highly controlled, and under multiple difference working conditions, king-post should be tested Calculate, the tension controlling king-post root concrete, to be advisable less than 1mpa, avoids king-post cantilever end to produce irrecoverable simultaneously Displacement.

For tiltedly only tower single plane cable stayed bridge, after naked tower is constructed to certain altitude (this bridge is+65.677), must basis apply The situation setting active diagonal brace at work scene or anchoring temporarily pull bar, take reinforcement measure to king-tower.Due to this bridge Sarasota height 123m, interim reinforcement measure must expend substantial amounts of section steel material, and must the cooperation of large-tonnage crane gear install, not only cost Put into huge, and there is the potential safety hazard of higher upper air installing weld job.For this reason, traditional first tower back rest becomes bridge technique Be not suitable for this bridge construction.

2nd, tower construction after first beam

With reference to the construction method of some back-cable-free cable-stayed bridges, in conjunction with the feature of the oblique only tower of this bridge, it would however also be possible to employ after first beam Tower is constructed.For example, the big vast mountain bridge in Changsha, and the Guixi Bridge in Jiangxi, the span of this two back-cable-free cable-stayed bridge main spans is divided Not Wei 206m, 209m, span and this bridge joint are closely.Except for the difference that, back-cable-free cable-stayed bridge only has single cable-stayed bridge, and Sarasota stress shows For the cantilever beam tilting, by unilateral drag-line, the dead-load moment of itself is balanced the moment of girder weight generation.

Because this bridge is land construction, meet the execution conditions of tower after first beam, lead, end bay box beam all can be in floor stand On complete construct, therefore this construction method is feasible.But this construction method increased the disposable input of temporary technique measure, main Take around 800t section steel material across setting up of floor stand, add assembling and disassembling expense, machinery expenses etc., considerably increase and apply The input of work cost, is very irrational in economically considering.Meanwhile, after first beam, tower process extends the construction period, can lead to The overall duration that engineering is completely constructed is delayed, affects social benefit.Therefore, this construction method there is also more deficiency.

Content of the invention

The present invention is directed to the construction that existing one-tenth bridge technique cannot complete tiltedly solely tower single cable plane mixing girder stayed-cable bridge well, and A kind of brand-new one-tenth bridge technique is provided.This one-tenth bridge technique is brand-new construction technology, can effectively realize to tiltedly only tower single cable plane The construction of mixing girder stayed-cable bridge.

In order to achieve the above object, the present invention adopts the following technical scheme that:

A kind of tower, beam and rope synchronously become bridge technique, and in described one-tenth bridge technique, main column creeping formwork construction, steel box girder cantilever are spelled Synchronous carrying out is intersected between dress, end bay concrete construction of cast-in-place box girders rack construction and hanging cable of stay cable stretching construction.

A kind of tower, beam and rope synchronously become bridge technique it is characterised in that main column creeping formwork construction, steel in described one-tenth bridge technique Synchronous carrying out is intersected between box girder cantilever assembly, end bay concrete construction of cast-in-place box girders rack construction and hanging cable of stay cable stretching construction.

In the preferred embodiment of the present invention, the flow process of described one-tenth bridge technique is as follows:

(1) main column creeping formwork segmental construction.Comprise stiff skeleton welding, cable guide pipe positioning, reinforcing bar binding and built-in fitting, creeping formwork Support body climbs, the synchronization follow-up of tower crane and lift facility;

(2) main span steel box-girder lifting splicing, girth welding, u floor welds, and steel anchor box cable guide pipe positions;

(3) suspension cable carries out hanging cable and pulling preparation, sets up interim hanging cable tensioning platform, hanging cable traction steel wire inside king-tower The arrangement of rope, suspension cable hang, the installation of stretch-draw jack and debugging;

(4) concrete box girder 0# block and toughened internal stress, 1# block, the construction of 2# block support cast-in-place, prestressing with bond tensioning pressure Slurry completes;

(5) after completing above working procedure, carry out the symmetrical synchronous tension of this sections suspension cable, finally pour this sections master Tower concrete.

Further, described step (4) must more early be fulfiled ahead of schedule in construction speed arrangement, provides to end bay hanging cable tensioning Condition.

Further, described step (1) to (3) is that segmented construction synchronization is carried out.

Further, described step (3) and main column creeping formwork construction intersect synchronization, carry out levels operation, must establishment high-altitude The interim safety work of cross-operation special construction technique scheme, the security protection above Erecting and improving operation layer and operation layer is put down Platform is it is ensured that personal safety during levels different work teams and groups' crossed construction.

To complete the construction of tiltedly solely tower single cable plane mixing girder stayed-cable bridge using the technique that the present invention provides, to have following excellent Point:

1st, tower beam rope synchronously becomes the enforcement of bridge technique, achieves satisfied achievement in terms of quality control.

According to " road oblique roller bridge design specification ", " highway bridge and culvert construction technique normalizing " and " highway engineering quality inspection comment Calibration is accurate ", Cheng Qiaohou items Con trolling index be satisfied by designing and specification requirement:

(1) girder segment weight error, no more than 2%.

(2) vertical error of beam, beams of concrete is not more than l/5000, and girder steel is not more than l/10000.Adjacent segment is relatively high Journey error is less than ± the 3% of segmental length.

(3) gradient of Sarasota is less than the h/3000 of code requirement, and not less than 30mm.

(4) Suo Li measured value error is respectively less than the 5% of design requirement.

(5) Cheng Qiaohou dead-load stress, meets specification regulation.

2nd, effectively reduce construction cost, improve the progress of construction.

3rd, constructed by circulation, launch qc activity to update construction method and technique, and then progressively improve construction and make Industry environment is it is ensured that construction safety.

4th, adopt tower beam rope synchronization Cheng Qiao construction technology it is achieved that full-bridge construction safe and reliable.

Brief description

To further illustrate the present invention below in conjunction with the drawings and specific embodiments.

The overall flow figure that Fig. 1 is implemented for present example;

Fig. 2 be the synchronous construction first stage in this example after bridge schematic diagram;

Fig. 3 be synchronous construction second stage in this example after bridge schematic diagram;

Fig. 4 be the synchronous construction phase III in this example after bridge schematic diagram;

Fig. 5 be synchronous construction fourth stage in this example after bridge schematic diagram;

Fig. 6 is the bridge schematic diagram after synchronous construction the 5th stage in this example.

Specific embodiment

In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, tie below Conjunction is specifically illustrating, and the present invention is expanded on further.

For the special construction of tiltedly only tower single cable plane mixing girder stayed-cable bridge, the present invention provides a kind of tower, beam and rope synchronous Become bridge technique, main column creeping formwork construction, steel box girder cantilever assembly, end bay concrete construction of cast-in-place box girders rack construction and suspension cable in this technique Synchronous carrying out is intersected between hanging cable stretching construction.

Tiltedly only tower single cable plane mixing girder stayed-cable bridge, main span steel box girder adopts free cantilever erection technology to construct, the height of Sarasota Degree is big compared with high and angle of inclination, cannot be independent from steady in work progress, and Sarasota construction and girder cantilever are synchronously carried out, by being subject to Dynamic balance realizes Sarasota stablizing in work progress.

This technique mainly uses bridge self structure, the gravity of each component and its utilize suspension cable biography in the structure Pass, make when not yet becoming bridge bridge structure be in dynamic mechanical balance state all the time.To ensure in the structure in work progress Power and deformation are within permissible range.The specifically synchronous construction process that intersects:

(1) main column creeping formwork segmental construction.Comprise stiff skeleton welding, cable guide pipe positioning, reinforcing bar binding and built-in fitting, creeping formwork Support body climbs, the synchronization follow-up of tower crane and lift facility.

(2) main span steel box-girder lifting splicing, girth welding, u floor welds, and steel anchor box cable guide pipe positions.

(3) suspension cable carries out hanging cable and pulling preparation.Interim hanging cable tensioning platform, hanging cable traction steel wire is set up inside king-tower The arrangement of rope, suspension cable hang, the installation of stretch-draw jack and debugging.

(4) concrete box girder 0# block and toughened internal stress, 1# block, the construction of 2# block support cast-in-place, prestressing with bond tensioning pressure Slurry completes.

(5) after completing above working procedure, carry out the symmetrical synchronous tension of this sections suspension cable, finally pour this sections master Tower concrete.

Wherein (4th) item must more early be fulfiled ahead of schedule in construction speed arrangement, provides condition to end bay hanging cable tensioning;

(1st), (2), (3) item operation are that segmented construction synchronization is carried out, about 12d of average duration;

The suspension cable of (3rd) item hangs and pulling preparation work, intersects synchronization with main column creeping formwork construction, carries out levels work Industry, palpus establishment high-altitude cross-operation special construction technique scheme, the security protection above Erecting and improving operation layer and operation layer Interim Safety operation platform is it is ensured that personal safety during levels different work teams and groups' crossed construction.

Based on above-mentioned principle scheme, the present invention further illustrates this programme by such as next instantiation:

This example is related to certain Binhai Road, its total length 3.66km, belongs to municipal one-level major trunk roads.This Binhai Road needs Design is across a significant bridge, its total length 1430m, main bridge 345m, northern access bridge 482.5m, southern access bridge 602.5m.Main bridge bridge Type is 60m+65m+220m for tiltedly only tower single cable plane mixing girder stayed-cable bridge, span arrangement.King-tower is arranged in median strip, adopts With reinforced concrete structure, box section.Tower top elevation+123.377m, king-tower fore-and-aft tilt angle is 75 °.Its appearance profile chi Very little horizontal by bottom of towe 12m (longitudinal) × 5m(), gradual change to tower top 5m × 3.4m.Upper king-post strut adopts creeping formwork method pouring construction, is divided into For 23 sections, it is 1 × 5.415m+19 × 4.2m+1 × 3.5m+2 × 4m that sections divides height.King-post concrete label c55.

Main bridge bridge type in this bridge adopts box-like construction, bridge for tiltedly only tower single cable plane mixing girder stayed-cable bridge, wherein king-tower Face above tower height about 98m, longitudinal inclination is 75 °.Due to being oblique only tower, this example design adopts king-tower, steel box-girder, end bay The technique that concrete box girder is synchronously constructed.Meanwhile, the version all according to king-tower for the corollary equipment such as tower crane, elevator is carried out Type selecting, arrangement, installation, and king-tower adopts climbing formwork for construction.

For the practical situation of bridge, this example adopts main column creeping formwork construction, steel box girder cantilever in bridge construction process The synchronous construction technology carrying out is intersected between assembly, end bay concrete construction of cast-in-place box girders rack construction and hanging cable of stay cable stretching construction.

Meanwhile, in order to ensure the quality constructed, whole process adopts high-precision measurement to control, specific as follows:

1st, realize the monitoring method of synchronous construction

Cable-stayed bridge belongs to high order redundant structure, the conjunction of design and construction height Rhizoma Nelumbinis, the construction method being adopted and erection sequence There is close contacting with the Main beam linearity of Cheng Qiaohou and structure dead load internal force.The construction stage with stayed-cable bridge structure system and Being continually changing of loading status, structural internal force and deformation also constantly change therewith it is therefore necessary to apply to each of cable-stayed bridge The work stage is analyzed in detail and is checked, try to achieve the stretching force of the every skew cables of cable-stayed bridge, elevation of main girders, king-post displacement and The calculated value of the construction control parameters such as structural internal force, makes clear and definite regulation to the order of construction, and in construction in addition Effectively control and construction management.Only in this way, just can ensure that the cable-stayed bridge stress of structure and deformation in work progress All the time, in the required zone of reasonableness of design, the geometricshape of Cheng Qiaohou girder meets design expectation, and structure itself is in again Optimum stress.

2nd, tower beam rope synchronous construction Controlling principle

(1) geometry (deformation) monitoring

No matter adopted any construction method, cable-stayed bridge is always deformed (flexure) in work progress, and structure Deformation will be affected by factors, easily makes physical location (facade absolute altitude, plane position in work progress for the bridge structure Put) state deviates expecting state so as to become that bridge is linear is not inconsistent with design requirement, so deformation monitoring must be implemented to it so as to Error between the physical location in construction and expecting state for the structure permissible range and become the linear state of bridge meet design will Ask.

(2) stress monitor

Stress monitor include structure deadweight and construction loads under stress, the prestress of structure, cable-tension and Temperature stress etc..Whether in work progress and in the stressing conditions of bridge completion state, to be consistent with design be to apply to Cable-Stayed Bridge Structure Work monitoring will clear and definite problem.Generally monitor to understand actual stress state by structural stress, if finding actual stress state Transfinite and will carry out cause investigation and adjustment with the difference of theoretical stress state, be allowed to change in allowed band.

(3) stay cable force test and control

The construction of cable-stayed bridge is the process that a system is continually changing, and in this process, the Suo Li of structure and deformation are all Change constantly.In order to realize designing the preferable bridge completion state providing, need to design a set of rational work progress Suo Li Tensioning and Adjusted Option, and realize designing predicted structure in the force request of bridge completion state and operation stage to meet bridge The characteristic of TERM DEFORMATION.Some bridges are just because the control deviation of this respect and require in the short time after being open to traffic again Carry out cable force adjustment.In this cable tension Adjusted Option, ratio realizes knot in bridge completion state what is more important work progress The safety of structure, the single tension pursuing Suo Li in work progress simply puts in place, although being capable of the preferable Cheng Qiao of design requirement State, but in work progress, the safety stock of structure is too small, once certain construction error or Construction defect, structure Extremely hazardous state will be in, even result in catastrophic accident.Accordingly, it is determined that the rope during rational stayed Cable Construction The key that power tensioning value is to ensure that Construction of Cable-Stayed Bridges safety and realizes preferable bridge completion state.

On the basis of above-mentioned design requirement, the integral construction of this example Bridge can using following construction process (referring to Fig. 1):

1st, carry out king-tower sections concreting;

Concrete conveyance carries out high tower concrete conveyance using piston concrete pump (ground pump).Ground pump conveying long away from Plugging and booster phenomenon often occur from concrete.Because this tower is higher, if plugging occurs, by extreme influence high tower coagulation soil application The quality of work.Therefore, using the generation of the pre- pipe-blocking-proof of following measures and booster in construction:

(1) this engineering adopts brand-new ground pump delivery pipe and joint pipe clamp, prevents aging and leads to the thinning pipeline of wall thickness For this bridge construction;

(2) reasonable Arrangement pipeline, using from box beam bottom reserving hole channel, facilitates delivery pipe directly through box beam roof and floor, subtracts The quantity of few bend pipe, reduces pipe friction;

(3) adopt high-low pressure to pump the novel pump truck of auto-conversion function, when plugging under low pressure pumping state, automatically turn Enter high pressure and produce instantaneously powerful thrust, prevent the development further of plugging;

(4) the strict slump controlling concrete and aggregate size are it is ensured that the workability of concrete is good.

2nd, carry out stiff skeleton construction after completing king-tower sections concreting;

For accelerating construction progress, this tower stiff skeleton is designed to the space frame knot of light section truss, lateral, diagonal brace composition Structure, wherein light section truss can adopt and divide Pin prefabricated in precasting yard, then is transported to on-site hoisting welding, to improve site operation Work efficiency.

3rd, carry out staying cable anchorage zone cable guide pipe and positioning is installed, install and prestress pipe system including king-tower access path Hole;

This bridge cable guide pipe positioning be different from conventionally, lower nozzle total powerstation three-dimensional coordinate survey set method for position.This bridge king-tower Cable guide pipe positioning to be assisted using lighter mould and cable guide pipe carried out with quick measurement and positioning, after cable guide pipe lifting is in place, only needs Cable guide pipe anchor plate center suitable for reading to be detected three-dimensional coordinate.Concrete localization method:

(1) under the cooperation of total powerstation, according to the gradient of cable guide pipe, two horizontal braces of one high and one low are welded.

(2) total station survey, the cable guide pipe jig of positioning lighter in weight are utilized on horizontal brace, makes in mould The heart is coincide with the central axis of cable guide pipe.

(3) welding jig is so as to firmly be connected with stiff skeleton.

(4) lifting cable guide pipe is placed on inside mould, and at this moment cable guide pipe can move up and down in central axis along mould To adjust three-dimensional coordinate.

(5) finally measurement cover plate is buckled in cable guide pipe top opening, fixed observer prism, as long as adjustment absolute altitude suitable for reading reaches setting Meter requirement can complete the installation positioning of cable guide pipe.

(6) reinforce cable guide pipe to be firmly connected with stiff skeleton, reclaim jig, to reuse.

4th, reinforcing bar binding and built-in fitting;

Upper king-post strut reinforcing bar has three kinds of models, i.e. φ 32, φ 16, φ 12, and reinforcing bar gross weight is 404.2t.Wherein φ 32 reinforcing bar For cage bar, φ 16 reinforcing bar is horizontal bar, and φ 12 reinforcing bar is drag hook reinforcing bar.By the use of stiff skeleton as force structure, binding reinforcement The size of design drawing, the posting of welding cage bar, cage bar is installed and is adopted upset straight thread splice mechanical connection manner, remaining reinforcing bar Using conventional improving bud grafting.

Reserving of king-tower built-in fitting, particularly exterior wall built-in fitting, uses pre-buried frustum nut, uses high-strength spiral shell after form removal Steel plate is connected by bolt with frustum nut to be tightened, and forms solderable steel plate.This method not only pre-buried convenience, and frustum can be reclaimed Nut, steel plate and bolt, also facilitate the repairing of later stage External Wall.

5th, climbing frame climbs;

Climbing frame in this example climbs step: shifting formwork plate afterwards, and fixes upper frame → erection support wall-attaching equipment → put forward Rise guide rail, guide rail withstands on stress → climbing shuttering and support → shuttering in stand apparatus and pours concrete.

6th, tower crane, elevator jacking;

Tower crane is located above creeping formwork, and elevator hangs platform with creeping formwork and is connected, below creeping formwork.

Therefore, tower crane, the principle of elevator jacking are, before creeping formwork climbs, the free height of tower crane must have guarantee enough, When highly not enough, jacking must be shifted to an earlier date and be unlikely to have influence on the lifting of tower crane it is ensured that creeping formwork climbs.Elevator is as climbing of creeping formwork Rise, subsequently just synchronization of jacking up, each top lifting height is consistent with creeping formwork.

7th, concrete strength reaches 90%, ring orientation prestress tensioning, mud jacking, sealing off and covering anchorage;

7.1 overview

King-post Suo Mao area adopts concrete anchor block to construct, and tower wall surrounding arranges ring orientation prestress.Ring orientation prestress is divided into u-shaped Bundle and line beam two class, steel bundle adopts two ends tensioning along king-post centrage radial arrangement, u-shaped Shu Jun, and line beam is one end and opens Draw.

7.2 corrugated tube drillings

Because the every sections of the coordinate of ring orientation prestress is in diverse location, therefore cannot be all in the fixed position perforate of template Many condition limits, and therefore takes rear lashing method, in order to ensure corrugated tube drilling must assure that unimpeded after concreting, applies Fill up using in bellows interior in workPlastics in stay tube, prevent duct in casting process to be squeezed and deform. Meanwhile, water under high pressure to be led in time toward in corrugated tube in casting process, it is ensured that duct is not blocked up till whole outflow clear water Pipe.

Afterwards in lashing method, if jail do not reinforced by corrugated tube, during concrete construction, corrugated tube can be made to produce displacement, therefore ring ripple The positioning precision of stricture of vagina pipe and fixation are the important steps controlling in construction.In Construction of Pylon, corrugated tube adopts angle steel ∠ 36 conduct Posting, is fixed on angle steel with φ 10u shape reinforcement welding every 50cm, collapses steel reinforcing it is ensured that plastics ripple with anti-at curve The stability of stricture of vagina pipe.

7.3 ring orientation prestress stretching construction key control point

(1) in pipeline the size of cross-sectional area and the complexity of lashing and whether can normally mud jacking operation relevant, too small Then lashing is all more difficult with mud jacking, excessive, can weaken the normal section of structure.Lashing test is carried out by 1:1 concrete model Learn,U shape steel strand wires existIn corrugated tube, lashing difficulty is very big, and uses insteadCorrugated tube can be more Smoothly lashing.

(2) u shape steel strand wires, in lashing, should carry out compiling bundle, and steel strand wires can be prevented to be wound around due to mutual in lashing, tensioning Disorderly and lead to discontinuity phenomenon.

(3) take symmetrical synchronous tension during ring orientation prestress tensioning, be stretched to should extend during load at different levels and hold the lotus time, make Steel bundle fully deforms.

(4) in order to reduce to greatest extent to wall body at stretching notchThe destruction of cage bar, reduces tensioning in construction The size of groove, so as to work anchor slab just can be held, using some pieces of work anchor slabs as backing plate, pads on limiting plate, Thus cause carrying out tensioning outside notch.

(5) u shape steel strand tension takes pre- tensioning measure, after pre- tensioning reaches control stretching force 25%, by steel strand wires Loosen, then tensioning is strong to the uneven stress overcoming steel strand wires again.Simultaneously because minor radius ring orientation prestress steel There is discontinuity in twisted wire, therefore, should not adopt ultra stretching.

7.4 hole path pressure grouting

After the completion of prestressed stretch-draw, mud jacking is carried out using yq-d new duct grouting material, this new grouting material is by high-performance Plasticiser, surfactant, many expansion sources micro-expanding agent, hydration inhibitors, migration-type resistance rusty stain, nanoscale mineral powder and water Mud forms, and directly adds water, easy to use.It has been investigated that, new duct grouting material has microdilatancy, zero contraction, flows greatly, no The not stratified premium properties of bleeding, meets the requirement of " highway bridge and culvert construction technique normalizing " (jtg/t f50 2011).

8th, the symmetrical synchronous tension of suspension cable;

Inclined guy cable stretching should follow the basic principle of symmetrically synchronous grading tension, simultaneously when not having particular provisions, with rope Based on power, extension value is as the stretching mode checked.

8.1 tensioning steps are:

(1) oblique tensile tower end hangs, and carries out the installation of jack;

(2) pre- tensioning is carried out with stretching rope power 40% tensile load, after stretching force reaches 40%, suspend tensioning, and measure note Record stretching end actual elongation value;

(3) formal integral tension is proceeded by according to instruction and enter the dual control stage, reach classification Suo Lishi every time, suspend Tensioning simultaneously measures record stretching end actual elongation value;

(4) stretching process adopts dual control, based on stretching force, is checked with elongation.

8.2nd, tensioning points for attention

(1) principle of symmetrical equilibrium should be followed during inclined guy cable stretching, m and s Suo Dong, western two funiculus lateralis power differences cannot be greater than opening The 5% of pulling force;

(2) answer synchronous tension when m rope, s rope inclined guy cable stretching, m is different from s stretching rope power, should be with certain ratio during tensioning Example synchronizes tensioning, finally reaches 100% stroke simultaneously;

(3) during pre- tensioning, only record inclined guy cable stretching end elongation, do not checked, stretching process dual control is with two grades I.e. suspension cable pulling force 40% is drawn to start;

(4), during inclined guy cable stretching, unit in charge of construction must carry out displacement to tensioning beam section anchor point absolute altitude, king-tower simultaneously Monitoring, if there are ANOMALOUS VARIATIONS, should stop construction operation immediately, search reason;

(5), during inclined guy cable stretching, the factors such as elevation, Suo Li, king-tower side-play amount need to be surveyed according to girder, current cable power is entered Row suitably adjusts, concrete adjustment amount, is determined according to measured data by on-site supervision personnel in tensioning;

(6), during inclined guy cable stretching, beam bottom checks that dolly should dock at immediately below cantilever beam-ends circumferential weld, and bridge floor crane should be parked In the range of girder 0 number section, near cantilever beam-ends, must not there are the temporary load(ing)s such as construction machinery;

(7) can not carry out during inclined guy cable stretching other any construction operations influential on cable tensios control such as lifting;

(8) tensioning must be carried out when temperature is constant at night and the steel box-girder roof and floor temperature difference is not more than 2 DEG C;

9th, after completing synchronous tension, carry out formwork reinforcement, measurement is checked;

After completing inclined guy cable stretching, according to arrangement and method for construction Screw arbor with nut at both-ends, formwork reinforcement is firm.Use Lycra total powerstation Template is carried out with the deviation that three-dimensional coordinate method checks four direction template, control deviation is less than the 10mm, Fang Kejin of code requirement Row concreting.

10th, proceed to step 1 and enter next circulation construction.

Based on above-mentioned construction process, in Specific construction, under king-tower, tower pier is divided into 6 sections overmolded to apply to this example Bridge Work, upper king-post strut is divided into 23 sections climbing formwork for construction, and steel box-girder is divided into 18 sections free cantilever erection constructions, all can be applied using assembly line work Work, by circulating line production, progressively improves construction method, improves construction technology, promotes engineering to guarantee both quality and quantity to complete.

Corresponding construction procedure is: box beam 0# block is tower, beam, post consolidation system, king-tower upper king-post strut t-01~t-09 sections Construction adopts climbing formwork for construction technique, and when climbing formwork for construction enters into t-10 sections, full-bridge enters " tower, beam, rope " synchronization Cheng Qiao and applies Work, main column creeping formwork construction is synchronously carried out with end bay support cast-in-place box beam, the assembly of main span steel box girder cantilever, hanging cable of stay cable tensioning, In whole work progress, it is circulated operation by sequence of construction.Whole synchronous construction is divided into five big stages to be carried out, often The individual big stage has and comprises some little stages.In construction, each operation sequence of construction is in strict accordance with the sequencing of stage sequence number Carry out, the same little stage is carried out by order from left to right in table, be shown in Table after 1~table 5. Sarasota binds, carry out girder closure and apply Work, after the completion of closure, removes straddle truck and other crane gears.

First stage: naked tower completes construction to t-09 sections, tower beam rope synchronous construction starting stage (referring to table 1)

Table 1

Note: this stage king-tower root maximum crushing stress -1.4mpa, minimum compression -0.9mpa, tension does not occur.

The comprising the following steps that (referring to Fig. 2) of this stage:

(1) complete 0# block box beam concrete, toughened internal stress concreting, complete the whole prestressed stretch-draw of box beam;

(2) complete end bay 1# block box beam concrete to pour, complete whole prestressed stretch-draws;

(3) complete steel box-girder g1, g2 section assembling (dividing into platform for lining to support);

(4) complete upper king-post strut t-01~t-09 sections, creeping formwork climbs t-10 sections;

(5) g3 steel box girder cantilever assembly (lifting of 240t door machine), m1 hanging cable tensioning are completed.

During in step 5, g3 steel box-girder adopts door machine assembled and welds, m1 suspension cable utilizes hoist engine and tower crane same What step carried out tower end hangs work.After g3 steel box-girder completes girth welding and detection is qualified, coordinated with bridge floor 25t truck crane, Carry out location steel box beam-ends cable guide pipe is installed.And then carry out m1 suspension cable girder end hangs traction work, carries out m1 afterwards The single tension of suspension cable.

Concrete box beam and toughened internal stress are constructed as conventional bracket cast-in-place construction.

Meanwhile, during king-tower t-01~t-06 construction, because lift facility is not up to the requirement of setting height(from bottom), using steel bushing ladder Carry out the operation up and down of workmen.

Second stage: to the t-13 stage, 2# block completes base plate and pours (referring to table 2) first tower beam rope synchronous construction

Table 2

Note: 2# block box beam is big due to concrete side's amount, and using placement layer by layer, this stage completes base plate and pours first, hands over 1# block Meet place, reserved 2m as after pour section (reserved effect is described in detail in detail hereinafter).This stage king-tower root maximum coagulation soil compressive stress- , maximum tension stress+0.2mpa(and is less than 1mpa in 4.3mpa).

This stage comprise the following steps that (referring to Fig. 3)

(1) upper king-post strut t-10 sections, door machine free cantilever erection g4 section steel box-girder, suspension cable m2 hanging cable tensioning are completed;

In this step, monitor instruction according to m1, after the completion of suspension cable m1 tensioning, carry out pouring of king-tower t-10 sections, While maintenance, carry out the stiff skeleton installation of next sections king-tower t-11 and the colligation work of reinforcing bar;Meanwhile, door machine continues to hang Spell g4 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete reinforcing bar in king-tower t-11 sections After checking and accepting, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M2 is oblique Drag-line starts that tower end hangs, beam section hangs, and tensioning work.

(2) upper king-post strut t-11 sections, door machine cantilever g5 section steel box-girder, suspension cable m3, s1 hanging cable tensioning are completed;

In this step, monitor instruction according to m2, after the completion of suspension cable m2 tensioning, carry out pouring of king-tower t-11 sections, While maintenance, carry out the stiff skeleton installation of next sections king-tower t-12 and the colligation work of reinforcing bar;Meanwhile, door machine continues to hang Spell g5 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete reinforcing bar in king-tower t-12 sections After checking and accepting, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;s1、 M3 suspension cable starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

(3) complete 2# concrete Cast-in-Situ Segment first time concrete placings (base plate, crossbeam and web), reserve with 1# section intersection and pour after 2m Section;

In order to ensure cable guide pipe positioning accurate, prevent concreting process from leading to cable guide pipe coordinate offset, after impact Continuous hanging cable of stay cable construction, reduces the tissue difficulty of generous amount once-pouring of concrete simultaneously, improves the quality that cloth vibrates. Through demonstration, concrete box beam is divided into two-step pouring.After the completion of base plate, crossbeam and web pour, cable guide pipe is in rigid concrete Above welded with pre-buried shaped steel, fixedly positioning, can effectively ensure the precision of mouth of pipe coordinate setting.

1# block and 2# block intersection, pour the effect of section after reserved 2m: according to the command request of design and monitoring side, carry out tiltedly The concrete box beam of cable tension must be carried out after the prestressed stretch-draw completing in box beam body and mud jacking work, otherwise huge tensioning Power can be by concrete drawing crack.If pouring section after not reserving 2m, that inclined guy cable stretching must be whole when 2# block box beam concrete Pour complete and tensioning after, can carry out.So leverage construction speed, the duration delays at least 2 months.Pour after reserved 2m Section, has just been temporarily switched off being rigidly connected of 1# block and 2# block, 2# block box girder construction would not have influence on 1# block suspension cable (s1~ S4 tensioning work).When second top board of 2# block pours, with after pour section and together pour, when concrete strength, to reach 90% laggard The tensioning of row prestressing with bond and mud jacking, whole operations complete only to need 15 day time, substantially increase construction speed it is ensured that main bridge The seriality of tower beam rope construction.

(4) upper king-post strut t-12 sections, door machine cantilever g6 section steel box-girder, suspension cable m4, s2 hanging cable tensioning are completed;

In this step, monitor instruction according to m3/s1, after the completion of the symmetrical synchronous tension of suspension cable m3, s1, carry out king-tower t-12 The pouring of sections.While maintenance, carry out the stiff skeleton installation of next sections king-tower t-13 and the colligation work of reinforcing bar;With When, door machine continues cantilever g6 beam section, carries out girth welding and cable guide pipe installs positioning work after being accurately positioned;In king-tower t-13 section After section completes the checking and accepting of reinforcing bar, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator is synchronous Jacking is followed up;S2, m4 suspension cable starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

(5) upper king-post strut t-13 sections, door machine cantilever g7 section steel box-girder, suspension cable m5 hanging cable tensioning are completed;

This step, monitors instruction according to m4/s2, after the completion of suspension cable m4, s2 tensioning, carries out pouring of king-tower t-13 sections Build.While maintenance, carry out the stiff skeleton installation of next sections king-tower t-14 and the colligation work of reinforcing bar;Meanwhile, door machine Continue cantilever g7 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete in king-tower t-14 sections After the checking and accepting of reinforcing bar, carry out the operation of climbing (tower crane free height determine meet require) of creeping formwork, elevator synchronization of jacking up with Enter;M5 suspension cable starts that tower end hangs, beam section hangs, and tensioning work.

(6) complete 2# second concrete placings of concrete Cast-in-Situ Segment (top board, flange plate), pour together including pouring section after reserved 2m Build, and complete whole prestressed stretch-draws of 2# section;

The concrete cause such as step (3) of this step.After tower beam rope synchronous construction proceeds to m5 hanging cable tensioning, the applying of king-tower Work must complete ensuing t-14 pour work and follow-up t-15 stiff skeleton, reinforcing bar, creeping formwork climb, elevator tower furred ceiling Rise work, main span steel box-girder must complete the sections welding job of g8 beam section, what suspension cable must complete m6/s3 hangs work.More than These are operated in tower beam rope synchronization crossed construction, about take 12 days.After the completion of these work, 2# block box girder tensioning pressure must be waited until The suspension cable symmetrical tensioning work of m6/s3 after slurry terminates, can be carried out.

2# block is secondary to pour (pouring section after comprising 2m), and after m5 tensioning, next day begins to carry out, and constantly pays close attention to same bar The intensity of part maintenance test specimen, after reaching 90%, carries out prestressing with bond tensioning and the mud jacking work of 2# block box beam at once.This portion 15 days when the division of labor is made trouble.

Therefore, pour section after being provided with 2m, the duration delays only 3(15-12=3) sky.

(7) upper king-post strut t-14 sections, door machine cantilever g8 steel box-girder, suspension cable m6, s3 hanging cable tensioning are completed;

In this step, monitor instruction according to m5, after the completion of suspension cable m5 tensioning, carry out pouring of king-tower t-14 sections.? While maintenance, carry out the stiff skeleton installation of next sections king-tower t-15 and the colligation work of reinforcing bar;Meanwhile, door machine continues to hang Spell g8 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete reinforcing bar in king-tower t-15 sections After checking and accepting, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;m6、 S3 suspension cable starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

(8) upper king-post strut t-15 sections, door machine cantilever g9 steel box-girder, suspension cable m7 hanging cable tensioning are completed;

In this step, monitor instruction according to m6/s3, after the completion of suspension cable m6/s3 tensioning, carry out pouring of king-tower t-15 sections Build.While maintenance, carry out the stiff skeleton installation of next sections king-tower t-16 and the colligation work of reinforcing bar;Meanwhile, door machine Continue cantilever g9 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete in king-tower t-16 sections After the checking and accepting of reinforcing bar, carry out the operation of climbing (tower crane free height determine meet require) of creeping formwork, elevator synchronization of jacking up with Enter;M7 suspension cable starts that tower end hangs, beam section hangs, and tensioning work.

(9) upper king-post strut t-16 sections, door machine cantilever g10 steel box-girder, suspension cable m8, s4 hanging cable tensioning are completed.

In this step, monitor instruction according to m7, after the completion of suspension cable m7 tensioning, carry out pouring of king-tower t-16 sections.? While maintenance, carry out the stiff skeleton installation of next sections king-tower t-17 and the colligation work of reinforcing bar;Meanwhile, door machine continues to hang Spell g10 beam section, carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete reinforcing bar in king-tower t-17 sections After checking and accepting, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;m8/ S4 suspension cable starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

Phase III: complete the construction of concrete box beam 2# block, tower beam rope synchronous construction to t-16 stage (referring to table 3 and Fig. 4)

Table 3

Note: this stage starts, first completes that 2# block is secondary to be poured and 2m post-cast strip pours, and completes in advance should in box beam body simultaneously Power tensioning mud jacking works.After this, the cantilever of girder and the tensioning work of m5 can be carried out, prevent from making because of inclined guy cable stretching The concrete box beam 2# block being not finished is become to lead to because internal force changes ftracture.This stage king-tower root concrete maximum crushing stress- , tension in 5.2mpa, minimum compression -0.2mpa.

Fourth stage: remove 0#, 1# block support and g1, g2 girder steel platform for lining, tower beam rope synchronous construction is to the t-22 stage (referring to table 4)

Table 4

Note: after the completion of phase III construction, the platform for lining of 0# block, 1# block support and g1, g2 girder steel is removed, and makes Disengaging contact with box beam bottom, discharge stress.This stage king-tower concrete maximum crushing stress -5.5mpa, minimum compression - , tension in 1.0mpa.

The specific implementation step in this stage is following (referring to Fig. 5):

(1) remove girder 0# section, toughened internal stress, 1# section support, remove g1, g2 girder steel platform for lining;

(2) upper king-post strut t-17 sections, door machine cantilever g11 section steel box-girder, suspension cable m9 hanging cable tensioning are completed;

From the angle saving construction cost, when inclined guy cable stretching is to end bay s4,1# block can be carried out, g1, g2 prop up The dismounting work of frame, is also the contact stress at release beam bottom simultaneously, is conducive to main bridge internal force to tend to reasonability.

Monitor instruction according to m8/s4, after the completion of suspension cable m8/s4 tensioning, carry out pouring of king-tower t-17 sections.In maintenance While, carry out the stiff skeleton installation of next sections king-tower t-18 and the colligation work of reinforcing bar;Meanwhile, door machine continues cantilever G11 beam section, carries out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete testing of reinforcing bar in king-tower t-18 sections Knock off after work, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M9 oblique pull Rope starts that tower end hangs, beam section hangs, and tensioning work.

(3) upper king-post strut t-18 sections, door machine cantilever g12 section steel box-girder, suspension cable m10, s5 hanging cable tensioning are completed;

Monitor instruction according to m9, after the completion of suspension cable m9 tensioning, carry out pouring of king-tower t-18 sections.Same in maintenance When, carry out the stiff skeleton installation of next sections king-tower t-19 and the colligation work of reinforcing bar;Meanwhile, door machine continues cantilever g12 beam Section, carries out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete the examination work of reinforcing bar in king-tower t-19 sections After work, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M10/s5 oblique pull Rope starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

(4) upper king-post strut t-19 sections, door machine cantilever g13 section steel box-girder, suspension cable m11 hanging cable tensioning are completed;

Monitor instruction according to m10/s5, after the completion of suspension cable m10/s5 tensioning, carry out pouring of king-tower t-19 sections.Supporting While shield, carry out the stiff skeleton installation of next sections king-tower t-20 and the colligation work of reinforcing bar;Meanwhile, door machine continues cantilever G13 beam section, carries out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete testing of reinforcing bar in king-tower t-20 sections Knock off after work, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M11 is oblique Drag-line starts that tower end hangs, beam section hangs, and tensioning work.

(5) upper king-post strut t-20 sections, door machine cantilever g14 section steel box-girder, suspension cable m12, s6 hanging cable tensioning are completed;

Monitor instruction according to m11, after the completion of suspension cable m11 tensioning, carry out pouring of king-tower t-20 sections.Same in maintenance When, carry out the stiff skeleton installation of next sections king-tower t-21 and the colligation work of reinforcing bar;Meanwhile, door machine continues cantilever g14 beam Section, carries out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete the examination work of reinforcing bar in king-tower t-21 sections After work, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M12/s6 oblique pull Rope starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

It is emphasized that t-21 sections is according to crossbeam in design setting, interior construction of beam is carried out now using setting up support Pour, interior crossbeam is with wall body primary concreting.

(6) upper king-post strut t-21 sections, door machine cantilever g15 section steel box-girder, suspension cable m13 hanging cable tensioning are completed;

Monitor instruction according to m12/s6, after the completion of suspension cable m12/s6 tensioning, carry out pouring of king-tower t-21 sections.Supporting While shield, carry out the stiff skeleton installation of next sections king-tower t-22 and the colligation work of reinforcing bar;Meanwhile, door machine continues cantilever G15 beam section, carries out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete testing of reinforcing bar in king-tower t-22 sections Knock off after work, carry out the operation of climbing (tower crane free height determines that satisfaction requires) of creeping formwork, elevator synchronization of jacking up is followed up;M13 is oblique Drag-line starts that tower end hangs, beam section hangs, and tensioning work.

(7) upper king-post strut t-22 sections, door machine cantilever g16 section steel box-girder, suspension cable m14, s7 hanging cable tensioning are completed.

Monitor instruction according to m13, after the completion of suspension cable m13 tensioning, carry out pouring of king-tower t-22 sections.Same in maintenance When, carry out king-tower bind section t-23 stiff skeleton install and reinforcing bar colligation work;Meanwhile, door machine continues cantilever g16 beam section, Carry out girth welding after being accurately positioned and cable guide pipe installs positioning work;Complete the checking and accepting of reinforcing bar in king-tower t-23 sections Afterwards, creeping formwork elevator and tower crane need not follow up, and upper frame has enough working places;M14, s7 suspension cable start tower end hang, beam Section hangs, and symmetrical synchronous tension work.

It is specifically intended that because of the wall body tectonic sieving feature of the section that binds, template processing must be carried out in advance, the taking of inner support If work.

In 5th stage: king-tower t-23 binds, girder g18 closure (participates in table 5)

Table 5

Note: maximum crushing stress -6.5mpa, minimum compression -3.9mpa in this stage king-tower root, does not occur drawing and answers Power.After closure, maximum crushing stress -6.4mpa, minimum compression -4.0mpa.

The comprising the following steps that (referring to Fig. 6) of this stage:

(1) remove girder 2# section support;

(2) upper king-post strut t-23 sections, door machine cantilever g17 section steel box-girder, suspension cable m15, s8 hanging cable tensioning are completed;

Monitor instruction according to m14/s7, after the completion of suspension cable m14/s7 tensioning, carry out pouring of the last sections of king-tower t-23. Meanwhile, door machine continues cantilever g17 beam section, carries out girth welding and cable guide pipe installs positioning work after being accurately positioned;M14, s7 are oblique Drag-line starts that tower end hangs, beam section hangs, and symmetrical synchronous tension work.

(3) according to monitoring instruction, assembled g18 section steel box-girder.

In assembled closure section g18 it is desirable to measurement and supervision department are to the absolute altitude in full-bridge beam face and Suo Li Continuous Observation 3 My god, check the absolute altitude of 15# transition pier bearing simultaneously it is determined that the elevation of g17 beam-ends absolute altitude and bearing meet design and monitoring After installation requirement, the assembly of g18 closure section can be carried out it is ensured that once docking successfully.

After completing above-mentioned five staged construction, complete entirely to become bridge construction, can be finally completed complete as follows Bridge construction:

(1), after full-bridge closure, the temporary facilities such as elevator, tower crane are removed;

(2) carry out secondary being adjusted to Qiao Suoli according to monitoring instruction;

(3) construction bridge floor appurtenant work and deck paving, completes secondary dead load and loads;

(4) carry out three times according to monitoring instruction and be adjusted to Qiao Suoli, to reach final design rope force value;

(5) suspension cable damping device and antivibrator are installed;

(6) final acceptance of construction, full-bridge construction completes.

By examples detailed above, for tiltedly only tower single cable plane mixing girder stayed-cable bridge, using tower beam rope synchronization crossed construction, , as a kind of new construction method, it is different from tower after the tower back rest construction of straight pylon cable-stayed bridge elder generation and back-cable-free cable-stayed bridge elder generation beam for it The method of construction, it possesses following two clear advantages:

First, in work progress, internal force is linear rationally

Tower beam rope synchronously becomes bridge technique, by the rope of king-tower itself, the gravity of end bay concrete box beam and main end bay suspension cable Transmission in bridge structure for the power, so that bridge structure is in dynamic mechanical balance shape all the time during not yet Cheng Qiao State.There is provided rational camber by work progress so that the rationally linear of process bridge state is realized.

2nd, economic reasonability

1. shorten construction speed

Complete an engineering in addition to will ensureing good construction quality, construction costs also to be reduced as far as, will use Fund in engineering construction is used effectively.Any one engineering project during carrying out, will expend greatly by every day The manpower of amount, financial resources and material resources, the reasonable arrangement duration, overall management is to ensure that construction quality and saving to reduce the engineering time One of effective way of construction costs.On the premise of one-tenth bridge line style and internal force being affected less based on tower beam rope synchronous construction, can Constructed with realizing tower beam rope, by workmen, mechanical reasonable arrangement, compared with asynchronous construction, synchronous construction shortens simultaneously Duration is fairly obvious.As shown in table 6.

6 Superstructure Construction time of table contrast table d

Note: in (1) table, multiplication sign left end represents the construction period of a sections, the right represents the number of construction sections;

(2) construction period of each sections is by model sheetinstallat, reinforcing bar and installed under prestressing, concreting and prestressing force (construction that girder section assembling also includes rope) is drawn to be considered in interior.

Duration due to each sections of king-tower is only 10d, when Construction of Pylon is to Section 9 section, with applying of king-tower sections Work is carried out, and does not interfere with the construction of later stage main span steel box-girder standard sections and rope, you can be fully immersed into the construction of king-tower In the work progress of girder.Tower beam rope synchronization crossed construction, to full-bridge bring be not only 140d(10 × (23-9)= 140) reduction of construction period, it is the secondary tune rope in this bridge later stage and the period of deck paving selects, and creates bigger sky Between it is often more important that ensure that this bridge secondary dead load construction after the completion of, select suitable solar term carry out three tune ropes, This is most important on becoming the linear internal force impact after bridge.

2. optimized technology

(1) solely tower is configured to tiltedly based on this bridge king-tower, using the first tower back rest construction method when, when climbing formwork for construction to the 9th During sections, Sarasota cannot lean on the rigidity that itself and stiff skeleton therein provide to keep stable, and king-tower root will appear from drawing should Power.Auxiliary construction certainly will be carried out by anchoring temporarily rope or interim steel bracket, this will greatly increase the input of construction cost And the potential safety hazard of construction.

(2) construction environment residing for this bridge allows to carry out the construction of floor stand by land, after therefore possessing first beam The condition of tower construction.After first beam, tower construction, can effectively reduce the risk of construction, the free cantilever erection simultaneously comparing steel box-girder is applied Work, can relatively easily control into the linear of bridge and internal force is in perfect condition.But, but need to increase substantial amounts of falsework Etc. technical measures construction cost, extend the construction period.

Consider factors above, using tower beam rope Trinity synchronous construction, as long as main column creeping formwork construction, steel box-girder are hanged Arm assembly and the operation reasonable arrangement of hanging cable tensioning, carry out monitoring measurement control measure simultaneously, so that Sarasota, end bay concrete box beam is led to Cross the girder of the equalising torque piecewise cantilever lengthening that Suo Li transmission produces, reach dynamic mechanical balance state, be completely permissible Realize tower beam rope synchronous construction.It is not only rational from technical standpoint, and can reach optimal economic rationality.

Ultimate principle, principal character and the advantages of the present invention of the present invention have been shown and described above.The technology of the industry , it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally for personnel The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and its Equivalent thereof.

Claims (4)

1. a kind of tower, beam and rope synchronously become bridge technique it is characterised in that main column creeping formwork construction, steel case in described one-tenth bridge technique Synchronous carrying out is intersected between girder cantilever assembly, end bay concrete construction of cast-in-place box girders rack construction and hanging cable of stay cable stretching construction;Described The step becoming bridge technique is as follows:
(1) main column creeping formwork segmental construction, comprises the reserved of stiff skeleton welding, cable guide pipe positioning, reinforcing bar binding and built-in fitting, climbs Mould bases body climbs, the synchronization follow-up of tower crane and lift facility;
(2) main span steel box-girder lifting splicing, girth welding, u floor welds, and steel anchor box cable guide pipe positions;
(3) suspension cable carries out hanging cable and pulling preparation, sets up interim hanging cable tensioning platform, hanging cable haulage cable inside king-tower Arrangement, suspension cable hang, the installation of stretch-draw jack and debugging;
(4) concrete box girder 0# block and toughened internal stress, 1# block, the construction of 2# block support cast-in-place, prestressing with bond tensioning mud jacking is complete Become;
(5), after completing above working procedure, the sections having completed climbing formwork for construction is carried out after the symmetrical synchronous tension of suspension cable, Pour the king-tower concrete of creeping formwork sections again.
2. a kind of tower according to claim 1, beam and rope synchronously become bridge technique it is characterised in that described step (4) exists Must more early fulfil ahead of schedule in construction speed arrangement, provide condition to end bay hanging cable tensioning.
3. a kind of tower according to claim 1, beam and rope synchronously become bridge technique it is characterised in that described step (1) extremely (3) it is that segmented construction is synchronous to carry out.
4. a kind of tower according to claim 1, beam and rope synchronously become bridge technique it is characterised in that described step (3) with Main column creeping formwork construction intersects synchronization, carries out levels operation, must work out high-altitude cross-operation special construction technique scheme, set up The interim Safety operation platform of the security protection above kind operation layer and operation layer is it is ensured that levels different work teams and groups intersection is applied The personal safety in man-hour.
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