CN104846744A - Construction method for pouring and forming urban viaduct curve type pier stud in one-off mode - Google Patents

Abstract

The invention discloses a construction method for pouring and forming an urban viaduct curve type pier stud in a one-off mode. The construction method includes the following steps of 1 positioning pier stud pre-buried main reinforcement, 2 chiseling the combined portion of a pier body and a pile cap, 3 staking out in survey, 4 putting up a scaffold, 5 machining and installing reinforcement, 6 machining and installing a formwork, 7 pouring concrete, 8 disassembling the formwork and curing, and 9 removing the scaffold. According to the construction method for pouring and forming the urban viaduct curve type pier stud in the one-off mode, the pier stud has the advantages of being fast to construct, reasonable in structure, economical, practical and the like and is widely applicable to an urban high-pier bridge, particularly an urban high-pier landscape bridge.

Description

A kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method

Technical field

The present invention relates to a kind of high-level bridge construction method, be specifically related to a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method.

Background technology

Along with fast development that is economic and urban traffic, the bridge in viaduct requires " landscape " gradually, Bridge Landscape for city or regional image mould also more and more pay close attention to by people, and to match with city or moulding of regional image.

Pier is compared with beam, and closer to the viewpoint of people, the shape of pier stud, the scale of construction, surfacing and appurtenance etc. all define landscape feature, are the emphasis of aesthetic design.

Bridge pier also develops from early stage cylinder pier to lighter pier very thin, attractive in appearance in recent years, and particularly curvilinear style pier stud is widely used at home.

Curvilinear style pier stud applicability is strong, handsome in appearance, avoids the defect of conventional construction method, and technically advanced, reliable, applicable, reasonable in economy, achieves significant economic and social benefit.

But complex structure: reinforcing bar flare and dense, space orientation are compared with difficult, template flare and in mould, operating space is little, pier top built-in fitting is many.

Traditional construction method is that the main muscle of pier shaft is on-the-spot by root spreading; horizontal hoop is colligation successively, and pier shaft standard paragraphs, the gradation of curved section template are installed, and concrete gradation is built; long construction period, easily produces outward appearance and the mass defects such as faulting of slab ends, aberration, cold seam, topping qualification rate be low.

For these defects, the present invention proposes a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method, and pier stud applicability is strong, handsome in appearance, avoids the defect of conventional construction method.

A kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method provided by the invention, construction sequence is as follows: the first step, the pre-buried main muscle location of pier stud: pre-buried main muscle, cushion cap reinforcing bar firm welding, and colligation stirrup forms stiff skeleton; Second step, pier shaft and cushion cap binding site dabbing: after cushion cap concrete strength reaches 2.5MPa, carry out dabbing to cushion cap end face concrete inside pier shaft embedded bar, cut a hole to concrete face has stone to expose, and rinse well; 3rd step, surveying and locating; Adopt total powerstation to put at cushion cap end face and establish Planar Contours inside and outside the longitudinal and transverse axis of pier stud and post mould, ink fountain ejects line, measures surrounding absolute altitude at the bottom of pier, as reinforcing bar binding, installation and formwork erection benchmark; 4th step, scaffold building; Pier shaft surrounding adopt Φ 48mm × 3.5mm bowl button support or fastener type steel pipe set up double-pole scaffold tear open as pier shaft reinforcement installation, template peace and concreting time working platform; Scaffold surrounding closes, basis falls within cushion cap and processes on the ground that hardened, interior outside utilizes steel pipe and fastener to arrange brace or bridging by code requirement, reserving model sheetinstallat inside scaffold and between external mold, tearing open apart from removing spacing, within the scope of work layer, channel width, scaffold floor is paved with surely, and peripheral platform railing is than the superiors operation floor height 1.2m; 5th step, steel bar meter and installation; 1) main muscle silk head processing: the main muscle of pier shaft (>=Φ 25mm) adopts roll forming straight screw sleeve to connect; 2) semiproduct processing: semiproduct adopt classification processing, take by root numbering blanking processing, classify and pile up for the main muscle of variable cross-section section and stirrup; 3) pier shaft cage of reinforcement processing: pier stud cage of reinforcement is overall loose tool long line method integral manufacturing on employing level land, steel bar meter workshop, adopt shaped steel that fixed curve section+long line loose tool of length-adjustable standard paragraphs pier shaft cage of reinforcement is set, arrange according to the main muscle of pier shaft, loose tool adopts adjustable support shaped steel frame; 6th step, template processing, installation; Number according to the good template of the level configurations of pier shaft before model sheetinstallat, entirety is assembled in advance, complete formwork edge joint, faulting of slab ends, planeness adjustment; Pre-splicing qualified template reaches local, plate face injustice≤1.0mm, adjacent two plate surface difference of height≤1.0mm, piece≤1.0mm, formwork integral surface finish≤3.0mm, and adopts paint to adjust mark after the template back of the body rib of examination split lattice; The template of pre-splicing acceptance(check) splits into block, and sanding machine is polished repeatedly to metal light tone, adopts unified release agent, at template surface uniform application, slightly air-dry, and adopts covered rearing with plastic film dust-proof; 7th step, concreting; Curvilinear style pier stud pier shaft and binder concrete monobloc cast shaping, pier shaft concrete vibrating is closely knit, reserve concreting tumbling barrel peace to tear open at the main muscle place of levels that pier top binder stretches into pier stud, vibrate personnel's lower channel, the reinforcing bar disconnected adopts rolling straight thread sleeve connection, and levels and adjacent bar splice are staggered and be not less than the distance of 35d; Personnel of vibrating reserve manhole through Dun Ding and cat ladder is inner to reinforcing bar, connect tumbling barrel concreting, it is suitable for reading that tumbling barrel adopts the lumps of wood, steel pipe becomes groined type to be supported on template, end mouth distance concrete end face is no more than 2.0 meters, concrete adopts mobile crane to promote hopper, tumbling barrel blanking, by horizontal 30cm layering, adjacent pier stud is built in turn, single pier stud surrounding and middle part pre-set multiple stage vibrating spear and vibrate, when building upper strata, poker vibrator extend into lower floor 5 ~ 10cm, after concrete strength reaches 2.5MPa, completes pier topmast seat cushion stone concrete artificial chiseling; 8th step, form removable, health; Crane coordinates and manually completes the dismounting of template, and the template classification of dismounting is stacked, and concentrates cleaning, brushes release agent and get ready and time to use; Normal temperature lower bolster to be sprinkled water maintenance after removing immediately, adopts plastic sheeting and adhesive tape closely to swathe covering, keeps plastic film covering tight, makes component surface be in moisture state all the time; 9th step, scaffold is removed; Dismantling operation frame after form removable, before scaffold is removed, do to check to scaffold, clear all surplus material, and utensil and foreign material, mark place of safety during dismounting, arranges warning mark comprehensively.

In the first step, to long-term exposed steel bar brushing aqueous rust preventive mud, main muscle connecting filament head screws in mechanical sleeve or protective cap, and overall parcel carries out corrosion protection.

In 6th step; template adopts crane to coordinate the mode of artificial adjustment to carry out block-by-block installation; coxopodite template is fixed by cushion cap embedded ribs; adjust to the right place by pre-splicing number order and mark during template assembly; adopt sticking double faced adhesive tape between piece and polish and flush; topping cushion block is vertical with template closely connected; every sections template assembly well checks center off normal and the verticality of template afterwards; be fastenedly connected accessory; model sheetinstallat completes; verticality and center detect qualified after, it is splayed fixation that the very useful cable wind rope of template joins tension device by steel form four limit.

In 7th step, after concreting completes, once slurry is received to pier jacking row, control surface planeness, until concrete want initial set also non-initial set time carry out secondary receive slurry, before form removable, after pier shaft and binder top concrete receive light, geotextiles is utilized to carry out covering retaining health to end face concrete.

In 8th step; high temperature season; Dun Ding arranges drip irrigation bucket tape splicing hole water pipe and is wound around pier shaft overlay film and drips pouring and carry out maintenance; winter construction; add the double-deck geotextiles of thickening after plastic sheeting swathes and swathe insulated curing; and inside support, increase canvas cover, carry out heating curing, guarantee that concrete is not less than 10 DEG C in 7 days after building.

The present invention has following beneficial effect relative to prior art: a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method provided by the invention: 1, quality significantly improves, pier shaft steel bar meter, level land overall loose tool long line method integral manufacturing take manufacturer's standard equalization, be convenient to quality control and examination, on-the-spot merogenesis is assembled into entirety, ensure that pier shaft reinforcement installation precision; Pier body formwork adopts large face set shaped steel formwork, taking externally to reinforce from steady system drawing, being disposablely assembled into entirety, be conducive to formwork edge joint, faulting of slab ends inspection and plan-position, degree control, improve pier stud finished appearance quality and geometric accuracy, achieve finished product pier shaft without tie rod hole; The high-quality release agent that template brushing is unified, the disposable continuous placing of pier stud concrete, after ensure that form removal, finished product pier shaft is without construction joint, and concrete color and luster is consistent.

2, construction safety, risk are little, process, site assembly formula installs few by external influence factor compared with conventional field processing in reinforcing bar field; Eliminate conventional template secondary installing, support, dismounting operation, improve working security.

3, duration, progress aspect, pier stud cage of reinforcement is loose tool method batch making inside, with bearing platform construction parallel operations, on-the-spot cage of reinforcement assembling is installed, the disposable Fast Installation of Pier Formwork, the disposable fast continuous placing of concrete, tie up with the reinforcing bar scene of routine is loose, reinforcing bar, template are installed at twice, concrete is built at twice and is compared, and single seat pier stud construction period can shorten 4 ~ 5 days.

4, cost-saving, economic benefit aspect, invention increases the utilization rate of template, steel pipe support circulation material; Decrease steel bar meter waste of material, improve work efficiency, eliminate conventional construction secondary joint treatment, scaffold job platform sets up dismounting, model sheetinstallat remove personnel, crane hoisting equipment input, achieve operation and effectively change, accelerate progress, decrease project management expense expenditure.

Accompanying drawing explanation

Fig. 1 is construction flow chart of the present invention.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described.

The features such as construction method provided by the invention has quick construction, rational in infrastructure, economical and practical, are widely used in city height pier bridge, especially city height pier landscape bridge.

The technological principle of construction method provided by the invention is: pier shaft surrounding is set up steel pipe scaffold and torn open and concreting job platform as the installation of pier shaft cage of reinforcement, template peace, pier shaft cage of reinforcement adopts level land loose tool method integral manufacturing in factory, on-the-spot merogenesis is mounted to entirety, pier body formwork adopts the set shaped steel formwork merogenesis of pier shaft curve form assembled, one piece Zhi Li, thus achieve pier shaft, inter-tie concrete continuously poured in one is shaping.

Operation scheme of the present invention is: one, the pre-buried main muscle pre-buried main muscle in location of pier stud and cushion cap reinforcing bar firm welding; the stirrup of colligation sufficient amount forms stiff skeleton; in case cushion cap concreting, embedded bar distortion, displacement when vibrating; to long-term exposed steel bar brushing aqueous rust preventive mud; main muscle connecting filament head screws in mechanical sleeve or protective cap, and overall parcel carries out corrosion protection.

Two, after pier shaft and cushion cap binding site dabbing cushion cap concrete strength reach 2.5MPa, dabbing is carried out to cushion cap end face concrete inside pier shaft embedded bar, cuts a hole to concrete face has more stone to expose (fresh concrete), and rinse well.

Three, surveying and locating adopts total powerstation to put at cushion cap end face and establishes Planar Contours inside and outside the longitudinal and transverse axis of pier stud and post mould, and ink fountain ejects line, measures surrounding absolute altitude at the bottom of pier, as reinforcing bar binding, installation and formwork erection benchmark.

Four, scaffold building pier shaft surrounding adopt Φ 48mm × 3.5mm bowl button support or fastener type steel pipe set up double-pole scaffold tear open as pier shaft reinforcement installation, template peace and concreting time working platform.

Scaffold surrounding closes, and basis falls within cushion cap and processes on the ground that hardened, and interior outside utilizes steel pipe and fastener to arrange brace or bridging by code requirement, guarantees the resistance to overturning of support.

Reserving model sheetinstallat inside scaffold and between external mold, tearing open apart from removing spacing, within the scope of work layer, channel width, scaffold floor is paved with surely, and peripheral platform railing is than the superiors operation floor height 1.2m.

Five, steel bar meter district is set up in steel bar meter and erecting bed, is specifically designed to reinforcing bar and stacks and processing.

1, main muscle silk head processing: the main muscle of pier shaft (>=Φ 25mm) adopts roll forming straight screw sleeve to connect, scene arranges silk head processing job platform, achieves Steel Reinforcing Bar Material, the processing of silk head, polishing, finished product stacking, checks and accepts streamlined operation.

2, semiproduct processing: semiproduct adopt classification processing, for the main muscle of variable cross-section section and stirrup because of each spot size not etc., take by root numbering blanking processing, classify and pile up.

3, pier shaft cage of reinforcement processing: in order to ensure precision and the installation effectiveness of on-the-spot pier shaft reinforcement installation, the main muscle of effective solution curved section and stirrup all directions and size technical barrier not etc., pier stud cage of reinforcement is overall loose tool long line method integral manufacturing on employing level land, steel bar meter workshop.

Because curve pier stud pier shaft curved section size is fixed, the on-the-spot shaped steel that adopts arranges fixed curve section+long line loose tool of length-adjustable standard paragraphs pier shaft cage of reinforcement, arrange according to the main muscle of pier shaft, loose tool adopts adjustable support shaped steel frame, to be adapted to different cross section Making of reinforcement cage and to be convenient to lifting displacement.

For Nantong City approach viaduct rectangle Buddha's hand column pier, pier stud short transverse is by the straightway+4m curved section changed, straightway sectional dimension (direction across bridge × along bridge to) is 1.6 × 2.0m, middle pier curved section tip section is of a size of 2.3 × 2.0m, abutment pier curved section tip section is of a size of 2.3 × 2.5m, on-the-spot on level land setting-out loose tool center line and pier shaft straight, tune cross-sectional axis overlaps, [pier shaft straightway interval 1.5m pressed by 12.6 channel-section steels in employing, curved section interval 1m arranges fetal membrane pedestal and (adopts shaped steel to connect between adjacent pedestal, to guarantee integral rigidity), consider the cross section gradual change of pier shaft curved section, curved section pedestal side the angle steel of width-adjustable Jie ∟ 100 × 10 is set and pedestal hinged, opposite side presses angle steel and the pedestal consolidation of pier shaft linear She Zhi ∟ 100 × 10, the angle steel of the superiors main muscle bracing frame rational height Ke Tiao Jie ∟ 50 × 5 and the angle steel of width-adjustable ∟ 100 × 10 hinged, curved section moulding bed supports the also gradual change thereupon of shaped steel height simultaneously, fetal membrane Liang Ce ∟ 100 × 10 angle steel side is used for the setscrew nut of fixing main muscle pullable positioning bar by main muscle spacing welding, complete the making of the long line loose tool of straightway pier shaft skeleton of 4m fixed curve section+change, this stand is applicable to pier in differing heights, the making of abutment pier cage of reinforcement.

Pier shaft cage of reinforcement adopts merogenesis to make, overall binding, first Ke Tiao Jie ∟ 100 × 10 Yu ∟ 50 × 5 angle steel is installed, 50 × 5 angle steel adopt alignment pin to be connected with opposite side Gu Jie ∟ 100 × 10 angle steel, main muscle brace rod installed by Liang Ce ∟ 100 × 10 angle steel, form overall fetal membrane, loose tool shaped steel and brace rod place main muscle by mark, the main muscle of pier shaft adopts roll forming straight screw sleeve to connect, the bar splice quantity of same section is no more than 50% of section number of steel bars, adjacent bar splice is staggered and is not less than the distance of 35d, curved section each main muscle need be put in strict accordance with design attitude, the main muscle of accurate adjustment curved section is towards also using nut-locking, then main muscle top is often being saved respectively, in and tail end welds altogether three roads and to put more energy into stirrup (diameter is with main muscle), put more energy into stirrup and main muscle firm by root spot welding, rigidity is hung to ensure that finished steel muscles and bones is erected, the merging precision of sleeve when skeleton fractionation and in-site installation, according to the construction process of the muscle method of forming of putting more energy into, last colligation pier shaft stirrup, main muscle is close in stirrup colligation, levels Grid Align, interlamellar spacing is accurate, complete cage of reinforcement.

After pier shaft cage of reinforcement coupling completes, the reinforcing bar that adjacent two joint cage of reinforcement are corresponding is painted and makes linkage flag, carry out section number, at merogenesis cage of reinforcement stirrup place of putting more energy into, hoisting ring is set, guarantee the rigidity of cage of reinforcement when lifting, avoid the distortion that is distorted, complete the withdrawing that pier shaft main muscle in both sides supports, remove the connection of side Ke Huo Dong ∟ 100 × 10, ∟ 50 × 5 angle steel and Ling mono-Ce ∟ 100 × 10 angle steel, so that merogenesis cage of reinforcement splits lifting displacement, the lifting of merogenesis cage of reinforcement is displaced to regulation place specification and deposits.

Cage of reinforcement is installed: the cage of reinforcement be up to the standards, and by front court erection sequence, adopt flat bed transport vehicle merogenesis to be transported to scene, flat bed transport vehicle arranges the identical cage of reinforcement supporting platform seat of same fetal membrane spacing, to prevent from being out of shape when cage of reinforcement stacking, transport.

Adopt the method merogenesis of " 2 liftings " to install by crane, lifting furred ceiling arranges wire rope shoulder pole girder and is connected with stirrup suspension centre of putting more energy into, and to ensure cage of reinforcement verticality, hand fit's cage of reinforcement is accurately in place.

The main muscle of pier stud adopts the band roll forming straight screw sleeve of locknut and the main muscle of sections cage of reinforcement and the pre-buried sign of cushion cap to sit in the right seat, connect one by one, adopt spanner by sleeve and treat that spreading bar connecting is tightened, again spreading reinforcing bar and sleeve are adopted nut-locking, and adopt torque spanner to test to quality of connection.

For ensureing pier shaft cage of reinforcement plan-position, verticality; by the setting-out of pier shaft plan-position on cushion cap; measure by falling hammer, on height, every 2-4m utilizes steel pipe to set up together main muscle to install profile frame formation stiff skeleton and check installing cage of reinforcement, protect on scaffold.

Section by section after cage of reinforcement installation, the side colligation of pier shaft cage of reinforcement and the clean protective layer thickness of designing requirement reinforcing bar match and with the same label of pier shaft concrete, same to color and luster, concrete protective layer pad in blossom type.

Curved section both sides pier shaft styletable establishes binder, first carries out upper binder bed die and installs, then complete binder reinforcement installation.

After pier stud reinforcement installation, as do not carried out model sheetinstallat in time, surrounding should arrange cable rope and to be fixed and to use colour bar cloth to carry out parcel antifouling, antirust.

Six, template processing, installation form are numbered according to the good template of the level configurations of pier shaft before installing, and entirety is assembled in advance, complete formwork edge joint, faulting of slab ends, planeness adjustment.

Pre-splicing qualified template should reach local, plate face injustice≤1.0mm, adjacent two plate surface difference of height≤1.0mm, piece≤1.0mm, formwork integral surface finish≤3.0mm, and adopts paint to adjust mark after the template back of the body rib of examination split lattice.

The template of pre-splicing acceptance(check) splits into block, and sanding machine is polished repeatedly to metal light tone, adopts unified release agent, at template surface uniform application, slightly air-dry, and adopts covered rearing with plastic film dust-proof, prevents secondary pollution, guarantees the minute surface sense of concrete surface.

Template adopts crane to coordinate the mode of artificial adjustment to carry out block-by-block installation; coxopodite template is fixed by cushion cap embedded ribs, adjusts to the right place during template assembly by pre-splicing number order and mark, adopts sticking double faced adhesive tape and polish to flush between piece; reach seam tight; without faulting of slab ends, topping cushion block is vertical with template closely connected, without damaged; every sections template assembly well checks center off normal and the verticality of template afterwards; be fastenedly connected accessory, ensure that template has enough strength and stiffness, qualified rear next joint template assembled.

Model sheetinstallat completes, verticality and center detect qualified after, it is "eight" shape fixation that the very useful cable wind rope of template joins tension device by steel form four limit.

Seven, concreting curvilinear style pier stud pier shaft and binder concrete monobloc cast shaping; because pier shaft reinforcing bar is intensive; pier top bearing pad stone reinforced mesh and built-in fitting more; concreting is its construction Difficulties with vibrating always; for guaranteeing that concrete enters mould smoothly; pier shaft concrete vibrating is closely knit; reserve concreting tumbling barrel peace to tear open at the main muscle place of levels that pier top binder stretches into pier stud; vibrate personnel's lower channel; the reinforcing bar disconnected adopts rolling straight thread sleeve connection, and levels and adjacent bar splice are staggered and be not less than the distance of 35d.

Personnel of vibrating reserve manhole through Dun Ding and cat ladder is inner to reinforcing bar, connect tumbling barrel concreting, tumbling barrel adopts the lumps of wood, it is suitable for reading that steel pipe becomes groined type to be supported on template, end mouth distance concrete end face is no more than 2.0 meters, concrete adopts mobile crane to promote hopper, tumbling barrel blanking, by horizontal 30cm layering, adjacent pier stud is built in turn, consider that in mould, reinforcing bar is intensive, vibrating spear displacement inconvenience, single pier stud surrounding and middle part pre-set multiple stage vibrating spear and vibrate, the personnel that are conducive on the one hand vibrating are vibrated, accelerate concrete vibrating progress on the other hand, avoid the cold seam of concreting time long easily formation, alleviate personnel labor intensity of vibrating, operation of vibrating is followed " first outside and then inside, fast inserting is pulled out slowly, but do not owe " principle, when building upper strata, poker vibrator extend into lower floor 5-10cm, to ensure comprehensive vibration compacting, the vibrated device impact of template should be prevented and deform or collision slab, reinforcing bar, built-in fitting etc., when finding that reinforcing bar is trampled or support member is shifted, timely correction, operating personnel is forbidden arbitrarily to walk about on reinforcing bar.

Once slurry is received to pier jacking row, control surface planeness in time after concreting completes, until concrete want initial set also non-initial set time carry out secondary receive slurry, prevent concrete surface from occurring crackle.

Before form removable, after pier shaft and binder top concrete receive light, geotextiles is utilized to carry out covering retaining health to end face concrete immediately.

After concrete strength reaches 2.5MPa, complete pier topmast seat cushion stone concrete artificial chiseling.

Eight, form removable, health crane coordinate and manually complete the dismounting of template, and the template classification of dismounting is stacked, and concentrate cleaning, brush release agent and get ready and time to use.

Normal temperature lower bolster to be sprinkled water maintenance after removing immediately, adopts plastic sheeting and adhesive tape closely to swathe covering in time, keeps plastic film covering tight, makes component surface be in moisture state all the time.

High temperature season, Dun Ding arranges drip irrigation bucket tape splicing hole water pipe and is wound around pier shaft overlay film and drips pouring and carry out maintenance.

Winter construction, adds after plastic sheeting swathes and thickeies double-deck geotextiles and swathe insulated curing, and inside support, increases canvas cover, and carries out heating curing, guarantees that concrete is not less than 10 DEG C in 7 days after building.

Nine, scaffold stripping gets final product dismantling operation frame after removing, and before scaffold is removed, do to check to scaffold, clear all surplus material, utensil and foreign material comprehensively; Mark place of safety during dismounting, warning mark is set, send special messenger to keep an eye on; The component and fitting removed answers classify and pile up, so that transport, maintenance and keeping.

The performance analysis of this constructure scheme: (one) Economic and Efficiency Analysis 1. pier shaft steel bar meter and on-the-spot bearing platform construction adopt parallel construction, have effectively achieved operation and transforms, improve continuity and the harmony of pier construction.

2. pier shaft Steel Reinforcing Bar Material, processing, integral manufacturing adopt manufacturer's standard equalization, are convenient to quality control and examination, effectively improve work efficiency, mechanical utilization rate, decrease the raw-material wasting of resources.

3. the main muscle of pier stud adopts straight screw sleeve mechanical connection, according to crane capacity, on-the-spot pier shaft cage of reinforcement can presegmentation spreading, adopt assembling integral installation, ensure that installation quality, installation effectiveness, reduce or cancel setting up of reinforcement installation platform, more traditional pier shaft reinforcement installation, the on-the-spot steel pipe that adopts successively sets up job platform, and main muscle adopts crane to coordinate and compares by root bead spreading, the colligation of layering stirrup, reinforcement process, and difficulty of construction reduces, labour intensity alleviates, jack lift reduces service time in a large number, and the duration shortens at double.

4. pier body formwork optimizes assembled, reinforcing mode, improve precision and the installation effectiveness of model sheetinstallat, pier shaft concrete one-time-concreting, decrease second coagulation soil joint treatment, reinforcing bar combing spreading, scaffold job platform in conventional project construction and set up dismounting, template secondary installing, support, dismounting operation, improve the utilization rate of template, steel pipe support circulation material, decrease the input of personnel, crane gear, material.

5. the present invention is under the prerequisite of ensuring the quality of products, and effectively saves the duration, decreases waste of material, improves work efficiency, reduces construction, management cost, have good economic benefit.

Construct for single seat pier stud (twin columns), comparatively conventional construction technique is compared, average saving artificial 15 work days, 25T mobile crane 3 machine-teams, reduction of erection time 4-5 days, improves the utilization rate of template, pier shaft double-pole scaffold steel pipe support circulation material, and labor service, machine cost reduce about 8000 yuan/, add that the duration saves the benefit brought, remarkable in economical benefits.

(2) social benefit analytic curve formula pier stud more application requires high project in city and regional image, this intermediate item most duration is tight, require high to quality, safety, civilized construction, the present invention is under the prerequisite effectively promoting quality, improve industrialized construction degree, few by Environment Confinement Factor, construction safety risk is little, in raising work efficiency, reduction of erection time, cost-saving and safety construction, achieve breakthrough, there is good social benefit.

Claims (5)

1. an overhead road of city curvilinear style pier stud one-time-concreting molding construction method, is characterized in that:

Construction sequence is as follows:

The first step, the pre-buried main muscle location of pier stud:

Pre-buried main muscle, cushion cap reinforcing bar firm welding, colligation stirrup forms stiff skeleton;

Second step, pier shaft and cushion cap binding site dabbing:

After cushion cap concrete strength reaches 2.5MPa, dabbing is carried out to cushion cap end face concrete inside pier shaft embedded bar, cuts a hole to concrete face has stone to expose, and rinse well;

3rd step, surveying and locating;

Adopt total powerstation to put at cushion cap end face and establish Planar Contours inside and outside the longitudinal and transverse axis of pier stud and post mould, ink fountain ejects line, measures surrounding absolute altitude at the bottom of pier, as reinforcing bar binding, installation and formwork erection benchmark;

4th step, scaffold building;

Pier shaft surrounding adopt Φ 48mm × 3.5mm bowl button support or fastener type steel pipe set up double-pole scaffold tear open as pier shaft reinforcement installation, template peace and concreting time working platform; Scaffold surrounding closes, basis falls within cushion cap and processes on the ground that hardened, interior outside utilizes steel pipe and fastener to arrange brace or bridging by code requirement, reserving model sheetinstallat inside scaffold and between external mold, tearing open apart from removing spacing, within the scope of work layer, channel width, scaffold floor is paved with surely, and peripheral platform railing is than the superiors operation floor height 1.2m;

5th step, steel bar meter and installation;

1) main muscle silk head processing: the main muscle of pier shaft (>=Φ 25mm) adopts roll forming straight screw sleeve to connect;

2) semiproduct processing: semiproduct adopt classification processing, take by root numbering blanking processing, classify and pile up for the main muscle of variable cross-section section and stirrup;

3) pier shaft cage of reinforcement processing: pier stud cage of reinforcement is overall loose tool long line method integral manufacturing on employing level land, steel bar meter workshop, adopt shaped steel that fixed curve section+long line loose tool of length-adjustable standard paragraphs pier shaft cage of reinforcement is set, arrange according to the main muscle of pier shaft, loose tool adopts adjustable support shaped steel frame;

6th step, template processing, installation;

Number according to the good template of the level configurations of pier shaft before model sheetinstallat, entirety is assembled in advance, complete formwork edge joint, faulting of slab ends, planeness adjustment;

Pre-splicing qualified template reaches local, plate face injustice≤1.0mm, adjacent two plate surface difference of height≤1.0mm, piece≤1.0mm, formwork integral surface finish≤3.0mm, and adopts paint to adjust mark after the template back of the body rib of examination split lattice;

The template of pre-splicing acceptance(check) splits into block, and sanding machine is polished repeatedly to metal light tone, adopts unified release agent, at template surface uniform application, slightly air-dry, and adopts covered rearing with plastic film dust-proof;

7th step, concreting;

Curvilinear style pier stud pier shaft and binder concrete monobloc cast shaping, pier shaft concrete vibrating is closely knit, reserve concreting tumbling barrel peace to tear open at the main muscle place of levels that pier top binder stretches into pier stud, vibrate personnel's lower channel, the reinforcing bar disconnected adopts rolling straight thread sleeve connection, and levels and adjacent bar splice are staggered and be not less than the distance of 35d;

Personnel of vibrating reserve manhole through Dun Ding and cat ladder is inner to reinforcing bar, connect tumbling barrel concreting, it is suitable for reading that tumbling barrel adopts the lumps of wood, steel pipe becomes groined type to be supported on template, end mouth distance concrete end face is no more than 2.0 meters, concrete adopts mobile crane to promote hopper, tumbling barrel blanking, by horizontal 30cm layering, adjacent pier stud is built in turn, single pier stud surrounding and middle part pre-set multiple stage vibrating spear and vibrate, when building upper strata, poker vibrator extend into lower floor 5 ~ 10cm, after concrete strength reaches 2.5MPa, completes pier topmast seat cushion stone concrete artificial chiseling;

8th step, form removable, health;

Crane coordinates and manually completes the dismounting of template, and the template classification of dismounting is stacked, and concentrates cleaning, brushes release agent and get ready and time to use; Normal temperature lower bolster to be sprinkled water maintenance after removing immediately, adopts plastic sheeting and adhesive tape closely to swathe covering, keeps plastic film covering tight, makes component surface be in moisture state all the time;

9th step, scaffold is removed;

Dismantling operation frame after form removable, before scaffold is removed, do to check to scaffold, clear all surplus material, and utensil and foreign material, mark place of safety during dismounting, arranges warning mark comprehensively.

2. a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method as claimed in claim 1, is characterized in that:

In the first step, to long-term exposed steel bar brushing aqueous rust preventive mud, main muscle connecting filament head screws in mechanical sleeve or protective cap, and overall parcel carries out corrosion protection.

3. a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method as claimed in claim 2, is characterized in that:

In 6th step; template adopts crane to coordinate the mode of artificial adjustment to carry out block-by-block installation; coxopodite template is fixed by cushion cap embedded ribs; adjust to the right place by pre-splicing number order and mark during template assembly; adopt sticking double faced adhesive tape between piece and polish and flush; topping cushion block is vertical with template closely connected; every sections template assembly well checks center off normal and the verticality of template afterwards; be fastenedly connected accessory; model sheetinstallat completes; verticality and center detect qualified after, it is splayed fixation that the very useful cable wind rope of template joins tension device by steel form four limit.

4. a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method as claimed in claim 3, is characterized in that:

In 7th step, after concreting completes, once slurry is received to pier jacking row, control surface planeness, until concrete want initial set also non-initial set time carry out secondary receive slurry, before form removable, after pier shaft and binder top concrete receive light, geotextiles is utilized to carry out covering retaining health to end face concrete.

5. a kind of overhead road of city curvilinear style pier stud one-time-concreting molding construction method as claimed in claim 4, is characterized in that:

In 8th step; high temperature season; Dun Ding arranges drip irrigation bucket tape splicing hole water pipe and is wound around pier shaft overlay film and drips pouring and carry out maintenance; winter construction; add the double-deck geotextiles of thickening after plastic sheeting swathes and swathe insulated curing; and inside support, increase canvas cover, carry out heating curing, guarantee that concrete is not less than 10 DEG C in 7 days after building.