CN110468723A - The main pier encased steel plate installation engineering method of swivel bridges - Google Patents

The main pier encased steel plate installation engineering method of swivel bridges Download PDF

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Publication number
CN110468723A
CN110468723A CN201910816639.XA CN201910816639A CN110468723A CN 110468723 A CN110468723 A CN 110468723A CN 201910816639 A CN201910816639 A CN 201910816639A CN 110468723 A CN110468723 A CN 110468723A
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China
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steel plate
pier
encased
construction
encased steel
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CN201910816639.XA
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Chinese (zh)
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CN110468723B (en
Inventor
徐琨
张树坤
桑泽晶
焦鹏
蔡坚
段英杰
王亚军
王富波
郑仕广
周培培
王凯军
李冬勇
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中铁六局集团太原铁路建设有限公司
中铁六局集团有限公司
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • E01D21/08Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections

Abstract

The invention belongs to the main pier encased steel plate construction fields of swivel bridges, the specially main pier encased steel plate installation engineering method of swivel bridges.The present invention solves the problems, such as high accuracy install using pre-buried encased steel plate and flange as a whole mounting means;It using the method for main pier stirrup segmented lifting together with encased steel plate, solves the problems, such as that encased steel plate WELDING STUDS conflicts with main pier pier shaft stirrup, has not only guaranteed main pier pier construction quality, but also effectively shorten the duration;The segmented assembly of encased steel plate, and in steel plate medial surface setting cross, longitudinal bracing members, jack zipper, it shapes to steel plate medial surface;Four face setting oblique pull steel wires, U-shaped 20 channel steels are reinforced on the outside of steel plate, are shaped to steel plate lateral surface, exactitude position, the deformation being effectively controlled in steel plate installation and welding process.Engineering method of the present invention is suitable for the encased steel plate that works steel plate design plays effect of contraction to concrete and constructs.

Description

The main pier encased steel plate installation engineering method of swivel bridges
Technical field
The invention belongs to the main pier encased steel plate construction field of swivel bridges, the specially main pier encased steel plate installations of swivel bridges Engineering method.
Background technique
With the development that Bridges in Our Country is built, more and more bridges need crossing highway and railway, and rotator construction has There is the features such as short time limit, guarantee Business Line safe operation, occupy little space, in order to reduce cross-line bridge construction to operating line It influences, rotator construction is widely used in highway, railroad bridge construction.
Summary of the invention
For the installation of the main pier encased steel plate of current swivel bridges, the present invention forms the construction of swivel bridges main pier encased steel plate The main pier encased steel plate installation engineering method of reliable construction technology, specially swivel bridges, it is ensured that the fortune of construction and railway, subway Battalion's safety, economic benefit and social benefit are significant.
The present invention adopts the following technical scheme that realization: the main pier encased steel plate installation engineering method of swivel bridges, including Following steps:
(1) cushion cap bottom layer of the reinforcing steel, pre-stress construction and pre-buried encased steel plate flange assembly synchronous construction on: cushion cap uses on swivel The wooden method constructing and overhanging model after the completion of bottom layer of the reinforcing steel, stud binding, installs lateral longitudinal prestressing steel strand wires, each one layer of pipeline;It is pre-buried outer Steel plated is connect with steel plate flange using bolt device to hole, and integral assembling process is synchronous with upper cushion cap bottom construction to be carried out, entire to spell Dress process is completed outside main pier foundation pit, and device to hole whole process is controlled, adjusted using level;
(2) encased steel plate flange as a whole is installed: after the completion of bottom layer of the reinforcing steel and pre-stress construction, it is fixed that built-in fitting is installed in upper cushion cap Position skeleton, pre-buried encased steel plate flange as a whole are lifted using crawler crane, are welded after total station positioning, leveling with locating framework It connects;
(3) binding of cushion cap top bars, pre-stress construction, pre-buried pier stud reinforcing bar, casting concrete on;
(4) main pier pier shaft main reinforcement, presstressed reinforcing steel section construction: pier shaft concrete pours by several times, and pier shaft main reinforcement is segmented number of segment and pier It is identical that body pours number, and presstressed reinforcing steel segmentation, joint is using connector connection;
(5) main pier stirrup, encased steel plate installation, reinforcing section construction: main pier does template construction, encased steel plate using encased steel plate It is welded using merogenesis segmental hoisting, bottom encased steel plate is first welded with pre-buried encased steel plate, main pier stirrup and encased steel plate constant pitch Section lifting, stirrup do at L-shaped, and stirrup binding is on the inside of the encased steel plate on WELDING STUDS, and segmented steel plate and segmented stirrup are simultaneously Lifting, total station is accurately in place, and stirrup scatters again after encased steel plate is in place and connect with main reinforcement, does not influence presstressed reinforcing steel construction;
(6) main pier pier shaft pours maintenance by several times.
The main pier encased steel plate installation engineering method of above-mentioned swivel bridges sets horizontal, longitudinal bracing members in main pier encased steel plate, falls Chain zipper, outside four sides sets oblique pull steel wire, U-shaped 20 channel steel is reinforced.
The main pier encased steel plate installation engineering method of above-mentioned swivel bridges, locating framework are welded using U-shaped 30 channel steel.
The main pre-buried encased steel plate of pier encased steel plate of swivel bridges is connect with flange steel plate using the accurate device to hole of bolt, Normal practice For pre-buried encased steel plate in upper cushion cap, after the completion of cushion cap reinforcing bar, presstressed reinforcing steel are all constructed, then bolt device to hole is carried out, live nothing Method meets the requirement of its device to hole.Therefore, pre-embedded steel slab and flange steel plate construction of the present invention uses integral installation mode, after accurate device to hole Cushion cap synchronous construction is gone up with turning, after upper cushion cap first layer presstressed reinforcing steel and ripple pipe construction, pre-embedded steel slab locating framework is installed, Steel plate integral hoisting is accurately in place.
Main pier encased steel plate and main pier pier shaft stirrup are unable to synchronous construction under normal conditions, cut because setting on the inside of encased steel plate Power nail, no matter first construct encased steel plate or stirrup, the two leads to WELDING STUDS and position when stirrup installation due to site operation It sets and conflicts, not can guarantee the normal construction and quality requirement of steel plate and reinforcing bar.The present invention turns main pier pier shaft encased steel plate Using the method for segmentation merogenesis, the segmented synchronous construction of stirrup, successfully solve what WELDING STUDS conflicted with position when stirrup installation Problem.The segment liftings such as main pier stirrup and encased steel plate, stirrup do at L-shaped, guarantee that lapped length of steel bar meets code requirement In the case of, on the inside of the encased steel plate on WELDING STUDS, segmented steel plate lifts simultaneously with segmented reinforcing bar for reinforcing bar binding, and total station is smart It is really in place, stirrup is scattered again after steel plate is in place and is connect with main reinforcement, has not only solved steel plate and reinforcement construction collision problem, but also guarantee Pier shaft steel plate, reinforcement construction quality, while meeting construction period.
It not deforming when to be further ensured that encased steel plate casting concrete, support, jack zipper, outside is set in steel plate Four sides sets oblique pull steel wire, U-shaped 20 channel steel is reinforced, and concrete pours by several times, effectively controls steel plate deformed.
Engineering method of the present invention has following technological merit:
(1) high accuracy install is solved the problems, such as using pre-buried encased steel plate and flange as a whole mounting means;
(2) using the method for main pier stirrup segmented lifting together with encased steel plate, encased steel plate WELDING STUDS and main pier are solved The problem of pier shaft stirrup conflicts not only had guaranteed main pier pier construction quality, but also has effectively shortened the duration;
(3) the segmented assembly of encased steel plate, and in steel plate medial surface setting cross, longitudinal bracing members, jack zipper, on the inside of steel plate Face shapes;Four face setting oblique pull steel wires, U-shaped 20 channel steels are reinforced on the outside of steel plate, are shaped to steel plate lateral surface, accurately Contraposition, the deformation being effectively controlled in steel plate installation and welding process.
Engineering method of the present invention is suitable for the encased steel plate that works steel plate design plays effect of contraction to concrete and constructs.
Detailed description of the invention
Fig. 1 is engineering method flow chart of the present invention.
Fig. 2 is Bridge Pier Construction process flow chart.
Specific embodiment
Construction technology process of the present invention and key points for operation are described in detail, construction technology process is as shown in Figure 1.
Key points for operation
Upper cushion cap bottom layer of the reinforcing steel, pre-stress construction and pre-buried encased steel plate flange assembly synchronous construction
Cushion cap is using the wooden method constructing and overhanging model on swivel, after the completion of bottom layer of the reinforcing steel, stud binding, installs lateral longitudinal prestressing steel and twists Each one layer of line, pipeline.Pre-embedded steel slab is connect with steel plate flange using M45 high-strength bolt device to hole, integral assembling process and upper cushion cap Bottom construction is synchronous to be carried out, and entire assembly process is completed outside main pier foundation pit, and device to hole whole process is controlled, adjusted using level Section.
The installation of encased steel plate flange as a whole
Upper cushion cap, which uses, installs the wooden method constructing and overhanging model, after the completion of bottom layer of the reinforcing steel and pre-stress construction, installs built-in fitting in upper cushion cap Locating framework, locating framework are welded using U-shaped 30 channel steel, and pre-buried encased steel plate flange as a whole is using 500 tons of crawler crane liftings, entirely It is welded after instrument of standing positioning, leveling with locating framework.
Upper cushion cap top bars binding, pre-stress construction, pre-buried pier stud reinforcing bar, casting concrete
Upper cap design of pile is octagonal, and top bars binding should be noted that prestressing force notch position is reserved, and pre-stress design is plum blossom Type is symmetrical, layering, Unequal distance arrangement, and when prestressing force lashing should be noted that prestress pipe is straight, and last pre-buried pier stud reinforcing bar guarantees Pre-buried depth 2.1m.
Main pier pier shaft main reinforcement, presstressed reinforcing steel section construction
Main pier does template construction using permanent set encased steel plate, and pier shaft uses hollow thin-walled high pier, sectional dimension 6*11.2m, Direction across bridge wall thickness 1.5m, along bridge to wall thickness 1.2m.Encased steel plate is welded using merogenesis segmental hoisting, and pier shaft concrete pours in four times It builds, the segmentation of pier shaft main reinforcement pours identical, 32 fining twisted steel presstressed reinforcing steel 11m long 408 of Φ with pier shaft, point 2 segments, joint It is connected using connector.
Main pier stirrup, reinforces section construction at encased steel plate installation
The segment liftings such as main pier stirrup and encased steel plate, stirrup do at L-shaped, guarantee that the stirrup lap of splice meets the feelings of code requirement Under condition, stirrup binding is on the inside of the encased steel plate on WELDING STUDS, to carrying out processing of rust removing, every row scissor power on the inside of steel plate before stirrup binding 3 row's stirrups are bound in following closely, segmented encased steel plate lifts simultaneously with segmented stirrup, and interface is staggered to meet construction and standardize and want It asks, total station is accurately in place, and stirrup scatters again after encased steel plate is in place and connect with main reinforcement, does not influence prestressing force fining twisted steel It constructs, setting spacing 30cm WELDING STUDS in main pier encased steel plate, not becoming when to be further ensured that encased steel plate casting concrete Shape sets support, jack zipper in encased steel plate, and outside four sides sets oblique pull steel wire, U-shaped 20 channel steel is reinforced, and effectively controls steel plate and becomes Shape meets specification and construction period.
Pour maintenance main pier pier shaft four times
Pier shaft uses hollow thin-walled high pier, sectional dimension 6*11.2m, direction across bridge wall thickness 1.5m, along bridge to wall thickness 1.2m.Covered with Angles Plate is welded using merogenesis segmental hoisting.Pier shaft concrete pours in four times, pours pier shaft bottom entity section 1m high, hollow section for the first time 9m high score two-step pouring, pier beam anchoring section one-time-concreting after installing steel box-girder bottom, and sprinkling maintenance is carried out in time, meet essence Roll the requirement of screw-thread steel job specfication.
Quality control
Before main pier construction the accurate location of pier middle line and pier internal and external contour line should be released in basic top surface.
Steel bar meter and installation
1. the binding molding of pier shaft reinforcing bar scene;Steel bar meter uses reinforcing bar factory concentrated processing.All using people behind transport to scene Work lift fortune and binding.
2. after inspection of steel reinforcement bars is qualified, being concentrated in processing site and cutting off, weld, bending forming, it is artificial to be then transported to main Dun Chu Binding forming, items processing and binding index strict control are within tolerance.
3. cover to reinforcement is using plastics arc cushion block to guarantee concrete surface quality.The radical of reinforcing bar, diameter, length Degree, number arrangement, position etc. all meet the requirement of design.
4. structure main reinforcement connector uses two-sided overlap welding, bound between main reinforcement and stirrup using tied silk.Binding or weldering The steel mesh and framework of steel reinforcement connect is without deforming, loosen phenomenon.
Pier shaft encased steel plate
1. main pier external mold, which directly utilizes, wraps up steel plate outside pier, when construction, has first installed external mold, and external mold surrounding is reserved 1.5*2.0m and applied Work door opening, rear polishing.External mold sets rear assembling reinforcement, finally installs internal model, and inner template uses wooden model.It is accurate before formwork support arrangement Discharging structure outer contour is simultaneously accurately levelling by substrate, verticality symbol of the levelling control errors in 2mm, after guaranteeing template assembly Close code requirement.Reinforcing bar, assembled formwork are lifted using hand fit's crawler crane.Mechanical hoisting is considered in stencil design, And design suspension centre need to be used for lifting, to prevent template deformation when lifting.One section template of every lifting will check the verticality of a template And geometry, it could continue to spell upper layer after errorless.Each reinforcing bolt is fastened after the completion of formwork support arrangement.
2. pier shaft concrete transportation and pouring
Before concreting, basis and pier shaft joint concrete are subjected to dabbing, laitance and welding slag is removed, rinses well, and Trimming connection reinforcing bar.
Concrete uses mixing station centralized mixing, is transported using concrete conveyance tank car, and pumping in place, is entered by tumbling barrel Mould.
3. Bridge Pier Construction process flow is as shown in Figure 2.
4. the construction of built-in fitting
To guarantee that built-in fitting position is accurate, reply built-in fitting takes fixation, to move when no vibrated concrete;It is pre-buried Below part and neighbouring concrete should be noted that vibration compacting;Exposed parts of the built-in fitting on pier will have obvious mark, pour to top When layer concrete, it should be noted that exposed parts size is accurate;Be embedded to pier, welding on the built-in fitting in platform cap when, Ying Jinliang is adopted With thin welding rod, low current, it is layered welding, in order to avoid burn concrete.
In concrete placement, should observe at any time the built-in fitting of setting, preformed hole, pre-buried support position whether move It is dynamic, if discovery displacement should correct in time, it should also be noted that template situation, should proofread and reinforce immediately if any deformation in casting process.
5. the dismounting of template
Curing in the mold is no less than 3 days, is poured to finish to full pier and is reached the dismountable internal model in the rear 15Mpa, and sequence is from up to down.External mold Steel plate plays permanent protective effect, does not remove.
6. the maintenance of concrete
Curing in the mold is no less than 3 days, and the concrete after demoulding uses the geotextiles of heat and moisture preserving to cover immediately, outer patch water proof plastics Film, it is uninterrupted to conserve using automatic water sprinkler systme and sprayer, drying and watering cycle is avoided the formation of, after curing time is no less than 7d, Health preserving blanket is removed, then is closely covered with plastic film, moisture-keeping maintaining 14d or more.
Concrete strength is not up to before prescribed strength during maintenance, not form removal.Concrete strength, which meets demoulding, to be wanted Ask, and the temperature difference between the temperature difference, Surface layer's concrete and the environment between core concrete and Surface layer's concrete ≯ 15 DEG C when tear open Mould.

Claims (3)

1. the main pier encased steel plate installation engineering method of swivel bridges, it is characterised in that the following steps are included:
(1) cushion cap bottom layer of the reinforcing steel, pre-stress construction and pre-buried encased steel plate flange assembly synchronous construction on: cushion cap uses on swivel The wooden method constructing and overhanging model after the completion of bottom layer of the reinforcing steel, stud binding, installs lateral longitudinal prestressing steel strand wires, each one layer of pipeline;It is pre-buried outer Steel plated is connect with steel plate flange using bolt device to hole, and integral assembling process is synchronous with upper cushion cap bottom construction to be carried out, entire to spell Dress process is completed outside main pier foundation pit, and device to hole whole process is controlled, adjusted using level;
(2) encased steel plate flange as a whole is installed: after the completion of bottom layer of the reinforcing steel and pre-stress construction, it is fixed that built-in fitting is installed in upper cushion cap Position skeleton, pre-buried encased steel plate flange as a whole are lifted using crawler crane, are welded after total station positioning, leveling with locating framework It connects;
(3) binding of cushion cap top bars, pre-stress construction, pre-buried pier stud reinforcing bar, casting concrete on;
(4) main pier pier shaft main reinforcement, presstressed reinforcing steel section construction: pier shaft concrete pours by several times, and pier shaft main reinforcement is segmented number of segment and pier It is identical that body pours number, and presstressed reinforcing steel segmentation, joint is using connector connection;
(5) main pier stirrup, encased steel plate installation, reinforcing section construction: main pier does template construction, encased steel plate using encased steel plate It is welded using merogenesis segmental hoisting, bottom encased steel plate is first welded with pre-buried encased steel plate, main pier stirrup and encased steel plate constant pitch Section lifting, stirrup do at L-shaped, and stirrup binding is on the inside of the encased steel plate on WELDING STUDS, and segmented steel plate and segmented stirrup are simultaneously Lifting, total station is accurately in place, and stirrup scatters again after encased steel plate is in place and connect with main reinforcement, does not influence presstressed reinforcing steel construction;
(6) main pier pier shaft pours maintenance by several times.
2. the main pier encased steel plate installation engineering method of swivel bridges according to claim 1, it is characterised in that main pier Covered with Angles Horizontal, longitudinal bracing members, jack zipper are set in plate, outside four sides sets oblique pull steel wire, U-shaped 20 channel steel is reinforced.
3. the main pier encased steel plate installation engineering method of swivel bridges according to claim 1 or 2, it is characterised in that locating framework It is welded using U-shaped 30 channel steel.
CN201910816639.XA 2019-08-30 2019-08-30 Installation and construction method for wrapping steel plate outside main pier of swivel bridge Active CN110468723B (en)

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