CN103924525A - Urban overpass industrial short-line prefabricating and splicing construction method - Google Patents
Urban overpass industrial short-line prefabricating and splicing construction method Download PDFInfo
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- 238000012423 maintenance Methods 0.000 claims description 5
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Abstract
The invention discloses an urban overpass industrial short-line prefabricating and splicing construction method. The method includes the first step of calculating the deflection aggregate value in each construction stage by considering the structure dead load of an overpass, the construction live load of the over pass and the load, based on the concrete shrinkage, creep, prestressed tendon relaxation and wind load influences, of the overpass, and dividing a whole box girder into multiple sections with the deflection aggregate value in the construction complete stage as the camber during cast-in-place beam construction; the sixth step of symmetrically splicing the box girder bodies in pairs in a suspended mode after the box girder bodies poured block by block are set finally and stacked and stored for a certain time period, and finally forming a multi-span continuous girder bridge. By means of the urban overpass industrial short-line prefabricating and splicing construction method, social resources are reasonably utilized, the input amount of steel and mechanical devices for the support system is lowered, construction cost is reduced, the land requisition and demolishing area is reduced, and the construction cycle is shortened.
Description
Technical field
The present invention relates to a kind of construction, relate in particular to a kind of urban interchange industrialization short-term precast assembly construction method.
Background technology
In urban interchange work progress, the main support cast-in-place method of using, this kind of stand construction method is long in time limit, be unfavorable for batch production large-scale production, be unfavorable for Engineering Quality Control, be unfavorable for reducing the impact of bridge construction on urban environment and existing traffic, in work progress, can not guarantee that city existing road has a good transport and communication network, there is very large destruction construction plant to surrounding environment, easily causes the inconvenience of public vehicles and resident trip along the line.In addition, traditional support cast-in-place method can not reasonably be utilized social resources, has strengthened the input amount of strutting system steel using amount and plant equipment, has increased construction costs, increased expropriation of land removal area, and the cost having increased does not meet the principle of energy-conserving and environment-protective.Therefore, be necessary existing support cast-in-place method to improve, adopt that precast assembly method is imperative efficiently.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of urban interchange industrialization short-term precast assembly construction method, this construction method has not only reasonably been utilized social resources, reduced the input amount of strutting system steel using amount and plant equipment, reduced construction costs, and reduced expropriation of land removal area, save the construction period, fundamentally saved a large amount of costs, there is obvious economic benefit.
The present invention solves the problems of the technologies described above the technical scheme adopting to be to provide a kind of urban interchange industrialization short-term precast assembly construction method, wherein,
The first step: consider overpass bridge structure dead load, construction live load and concrete shrinkage, creep, presstressed reinforcing steel is lax, wind carries the load affecting on basis, calculate each construction stage amount of deflection and aggregate-value, and using and constructed stage amount of deflection aggregate-value as camber in in-situ beam casting, by whole, across case beam, be divided into some sections;
Second step: design, manufacture and installation form, template system comprises bed die, side form, fixed end mould and internal mold.Template should match with precast pedestal;
The 3rd step: the setting of the layout of the installation of the installation of tie with reinforcing bar, prestress pipe and location, built-in fitting and location, concrete pad, cage of reinforcement suspension centre;
The 4th step: each construction stage amount of deflection and the aggregate-value that calculate according to the first step are carried out to space coordinates conversion, build the whole some sections that are divided into across case beam at precasting yard same position with capable of regulating template block-by-block; Concrete building, comprises that base plate cast, web are built, top board is built;
The 6th step: concrete curing, concreting should be carried out maintenance after completing initial set;
The 5th step: measure to bury and a little bury underground and measure, before concrete final set, measuring measuring point buries underground, comprise axial line control point, absolute altitude control point, before the form removal of concrete final set back rest section, in time measuring point is measured, prefabricated linear of short-term method is to be undertaken by the coupling between two beams, after having completed the production procedure that a hole beam is complete, determine that this Kong Liang's is linear, the deviation that last beam section occurs, a beam section after passing to, form the accumulation of error, horizontal movement to each matching beam section, the casting position that vertical elevation is equivalent to new beam section adjusts, make it reach the theory of whole hole when beam prefabricated linear.
The 6th step: after the case beam final set that block-by-block is built, by symmetrical cantilever, finally form multi-span continuous bridge after storing up certain hour.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, template adopts steel material, and screw device is stretched on template system configuration hydraulic jack and top.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, both sides uniform distribution during concreting; control hierarchy thickness, notes observing interior formwork and discharges situation while vibrating, grasp vibrating time; guarantee concrete compaction, during cloth, control blanking velocity.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, measurement measuring point is buried underground and is comprised 2 axial line control points, 4 absolute altitude control points, axial line control point is U-shaped reinforcing bar embedded part, relief is cross head galvanized bolt.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, during box girder assembling that block-by-block is built, at the intersegmental coupling face of beam, smear cementing agent, and with mud jacking after tension of prestressed tendon anchoring, progressively form T shape balanced cantilever, by closure section, adjacent cantilever is coupled together.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, beam precast is deposited and is installed for three months later in stockyard, after form removable, all exposed steel bars is brushed to cement paste protective treatment.
Above-mentioned a kind of urban interchange industrialization short-term precast assembly construction method, wherein, block-by-block can be transported and be deposited after building case beam, first utilize the jack be arranged on bed die by it with newly to water sections separated, recycling operation car is drawn to suitable position by trailer system, then utilizes straddle truck lifting handling to storage area to deposit, and box girder segment divides three layers to deposit, monolithic box girder segment is deposited in adjacent two and is stored up on pedestal, and fulcrum adopts bar shaped pad form.
The present invention contrasts prior art following beneficial effect:
Applied range, for all kinds of bridge types, various across footpath and different bridge long girder and bridge pier, are all a kind of cost-effective construction methods, for various tiltedly, slope, curved bridge also easily adjust.
Construction costs is low, and precast segment is saved 10%～20% engineering cost than conventional construction, and span is larger, more across number, and effect is more obvious.
Programming is fast, compares with traditional bracket casting method, cast-in-place cantilever method, and precast segment cantilever can be constructed with substructure simultaneously, and programming shortens greatly.
Quality is convenient to control, prefabricated section Jian factory or precasting yard construction, and easy operating, its quality is convenient to control.
Be conducive to safety, due to what prefabricated cantilever technology plant and operating personnel in whole work progress carried out, be mostly repetitive operation, its security reliability is high.
Little to urban environmental impact, while adopting prefabricated cantilever technology construction grade separation bridge, elevated bridge, because the time of operation is at the scene short, bridge construction can be dropped to minimum to the impact of urban environment.
In a word, on the one hand, urban interchange construction is the main path that improves urban traffic; On the other hand, urban interchange construction period is very outstanding to the adverse effect of urban environment and existing traffic, once occur collapsing, the life causing, property loss and social influence will be very serious, so popularization adopts prefabricated cantilever technology to build urban interchange, viaduct is imperative.It is feasible technically that short-term mates prefabricated cantilever construction technology, reasonable in economy, and production streamlined, standardization, mechanization degree are high, are beneficial to batch production large-scale production, meet the requirement of owner to duration, quality.
Accompanying drawing explanation
Fig. 1 is the construction flow chart of a kind of urban interchange industrialization of the present invention short-term precast assembly construction method.
The specific embodiment
Detailed construction technology process as shown in the figure.Be specially chassis and template system processing, end mould, bed die, outer side mold are installed, and measure control before installation, cage of reinforcement lifting, before lifting, carry out reinforcing bar binding and bellows and installation of embedded parts, then inner membrance is in place, and fixed end mould repetition measurement carries out concreting and maintenance after design of concrete, stripping, the transhipment of matching beam section is deposited, and newly waters beam section and moves to matching beam position, then at cage of reinforcement Hoisting Position repeated matching beam, locates.
This construction method be applicable to bridge engineering, municipal engineering and various bridge crossing, across road and bridge and construction plant is narrow etc. need be in the engineering construction not affecting under the current prerequisite of traffic.
Short-term method be exactly consider structure dead load, construction live load and other load as: concrete shrinkage, creep, presstressed reinforcing steel is lax, wind carries etc. affects on basis, accurately calculate each construction stage amount of deflection and aggregate-value, and using and constructed stage amount of deflection aggregate-value as camber in in-situ beam casting, by whole, across case beam, be divided into some sections, carry out space coordinates conversion, at precasting yard same position, with capable of regulating template block-by-block, build, after storing up certain hour, adopt Bridge Erector by symmetrical cantilever.When assembled, at the intersegmental coupling face of beam, smear cementing agent, and with mud jacking after tension of prestressed tendon anchoring, progressively form T shape balanced cantilever, by closure section, adjacent cantilever is coupled together, finally form multi-span continuous bridge.
Stencil design, manufacture and installation:
Template system comprises bed die, side form, fixed end mould and internal mold.Template should match with precast pedestal, drops into enough box girder segment prefab form systems, and template should adopt steel material.For handled easily, template system should configure hydraulic jack and screw device is stretched on top.Whole steel form system entrusts that specialized company designs, specialized factory manufactures.
The colligation of cage of reinforcement and lifting:
The working contents of this operation has: the setting of the layout of the installation of the installation of tie with reinforcing bar, prestress pipe and location, built-in fitting and location, concrete pad, cage of reinforcement suspension centre.
Concreting:
Concrete basic demand, short-term precast concrete raw material, concrete performance require, concrete mix must meet engineering relevant regulations.Before box girder segment prefabricated construction, its match ratio is joined by the strict examination of test room, and concrete performance must meet design and code requirement.Concrete building, comprises that base plate cast, web are built, top board is built.Both sides uniform distribution during concreting, strict control hierarchy thickness, strictly operates by the technical key point of " fast inserting pulled out slowly " while vibrating, and notes observing interior formwork and discharge situation, grasps vibrating time, guarantees concrete compaction.In concreting process, forbid vibrating spear direct collision bellows, built-in pipe, built-in fitting, prevent the displacement of set aside pre-embedded pipe fitting.While noting cloth, the strict blanking velocity of controlling, prevents that concrete from causing excessive shock to set aside pre-embedded pipe fitting simultaneously.
Measurement is buried and is a little buried underground and measure:
Before concrete final set, measure as required measuring point and bury underground, generally comprise 2 axial line control points, 4 absolute altitude control points.Axial line control point is U-shaped reinforcing bar embedded part, and relief is cross head galvanized bolt.Before the form removal of concrete final set back rest section, in time measuring point is measured.Prefabricated linear of short-term method is to be undertaken by the coupling between two beams, the linear of one hole beam need to pass through many independent pedestals, through a production line, after having completed the production procedure that a hole beam is complete, could determine that this Kong Liang's is linear, the deviation that last beam section occurs, a beam section after can passing to, forms the accumulation of error, and this has proposed very high requirement to measuring to control.The key of short line measurement is exactly that the casting position that the horizontal movement of each matching beam section, vertical elevation are equivalent to new beam section is done very meticulous adjustment, makes it reach the theory of whole hole when beam prefabricated linear.In order to reach desirable bridge linear, by the longitudinal centre line of each beam making bench, end mould and measurement line of observation level, the line that is observation point and backsight point is fixed, allow end mould plane all the time with the longitudinal centre line of beam making bench, to measure the line of observation vertical, reaches the stepping object of bridge horizontal curve, vertical curve, superelevation by matching beam being carried out to translation, deflection, four jiaos of elevations of adjustment at every turn.
Concrete curing: concreting should be carried out maintenance after completing initial set in time, and maintenance process will adapt to the variation of construction seasons.In addition, according to designing requirement, after beam precast, need in stockyard, deposit after three months and could install, for preventing that secondary from building exposed steel bar corrosion partly, after form removable, immediately all exposed steel bars be brushed to cement paste protective treatment.
Non-standard precast segment: non-standard sections mainly refers to utilize that standard internal mold is disposable carries out prefabricated sections, and non-standard sections all needs two-step pouring just can complete.If block weight is larger, and as pier top express mail, elevating capacity is not enough, can diaphragm partly be hollowed out prefabricated.Cast is for the second time to carry out after box girder segment is installed location.While pouring into a mould for the first time, installation, the location of bed die, fixed end mould and side form are identical with the method for standard sections.Inner formwork system is different, and the inner formwork system of standard sections is comprised of steel form, hydraulic means, shore, sliding beam and chassis; And the internal mold of pier back timber section is comprised of part steel form, shore and fast easy-to-closing in net stencil, internal mold steel form beyond cross wall scope, and support with shore, the web inner side template fast easy-to-closing in net stencil within the scope of cross wall, and support with scaffold tubes.Cross wall reinforcing bar is reserved through fast easy-to-closing in net stencil, spreading during second pouring.Pouring concrete order is the same with standard sections casting sequence for the first time, and first base plate, then web, then pour into a mould top board and frange plate.For the beam section that is provided with prestressing tendon steering block, by adopting upset straight thread splice and utilizing the method for standard inner formwork system cast to carry out.The joint that is about to steering block embedded bar is made into upset straight thread splice, and upsetting straight sleeve is installed, and sleeve end face is worn plastic screw.When template is installed, sleeve end face plastic screw withstands on internal mold, and after assurance form removable, sleeve end face exposes.After form removal, back out plastic screw, spreading steering block reinforcing bar, installs steering gear formwork cast steering block concrete.
Sections transhipment and depositing: when matching segment completes after matching task, i.e. Transshipment Permitted and depositing.Matching segment when transhipment, first utilize the jack that is arranged on bed die by it with newly to water sections separated, recycling running trolley draw to suitable position by trailer system, then utilizes straddle truck to lift by crane handling to storage area and deposits.Sections transhipment lifting adopts special hanger, and the hoisting point position of each sections is strictly arranged by the requirement of design: for pier jacking block, comprise part adjacent segment, by pre-buried essence, prick screw thread bar reinforcement; For other sections, take reserving hole channel.Box girder segment divides three layers to deposit, and monolithic box girder segment is deposited in adjacent two and stored up on pedestal, considers that case beam cross dimensions is less, for avoiding producing excessive tensile stress in the process of storing up, makes case beam damage fulcrum adopt bar shaped pad form.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little modification and perfect, so protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (7)
1. a urban interchange industrialization short-term precast assembly construction method, is characterized in that,
The first step: consider overpass bridge structure dead load, construction live load and concrete shrinkage, creep, presstressed reinforcing steel is lax, wind carries the load affecting on basis, calculate each construction stage amount of deflection and aggregate-value, and using and constructed stage amount of deflection aggregate-value as camber in in-situ beam casting, by whole, across case beam, be divided into some sections;
Second step: design, manufacture and installation form, template comprises bed die, side form, fixed end mould and internal mold, template should match with precast pedestal;
The 3rd step: the setting of the layout of the installation of the installation of tie with reinforcing bar, prestress pipe and location, built-in fitting and location, concrete pad, cage of reinforcement suspension centre;
The 4th step: each construction stage amount of deflection and the aggregate-value that calculate according to the first step are carried out to space coordinates conversion, build the whole some sections that are divided into across case beam at precasting yard same position with template block-by-block; Concrete building, comprises that base plate cast, web are built, top board is built;
The 6th step: concrete curing, concreting is carried out maintenance after completing initial set;
The 5th step: measure to bury and a little bury underground and measure, before concrete final set, measuring measuring point buries underground, comprise axial line control point, absolute altitude control point, before the form removal of concrete final set back rest section, in time measuring point is measured, prefabricated linear of short-term method is to be undertaken by the coupling between two beams, after having completed the production procedure that a hole beam is complete, determine that this Kong Liang's is linear, the deviation that last beam section occurs, a beam section after passing to, form the accumulation of error, horizontal movement to each matching beam section, vertical elevation adjusts with respect to the casting position of new beam section, make it reach the theory of whole hole when beam prefabricated linear,
The 6th step: after the case beam final set that block-by-block is built, by symmetrical cantilever, finally form multi-span continuous bridge after storing up certain hour.
2. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 1, is characterized in that: template adopts steel material, and screw device is stretched on template system configuration hydraulic jack and top.
3. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 2; it is characterized in that: both sides uniform distribution during concreting; control hierarchy thickness; while vibrating, note observing interior formwork and discharge situation; grasp vibrating time; guarantee concrete compaction, during cloth, control blanking velocity.
4. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 3, it is characterized in that: measurement measuring point is buried underground and comprised 2 axial line control points, 4 absolute altitude control points, axial line control point is U-shaped reinforcing bar embedded part, relief is cross head galvanized bolt.
5. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 3, it is characterized in that: during box girder assembling that block-by-block is built, at the intersegmental coupling face of beam, smear cementing agent, and with mud jacking after tension of prestressed tendon anchoring, progressively form T shape balanced cantilever, by closure section, adjacent cantilever is coupled together.
6. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 3, is characterized in that: case beam beam precast is deposited and installed for three months later in stockyard, after form removable, all exposed steel bars is brushed to cement paste protective treatment.
7. a kind of urban interchange industrialization short-term precast assembly construction method according to claim 3, it is characterized in that: block-by-block is transported and deposited after building case beam, first utilize the jack be arranged on bed die by it with newly to water sections separated, recycling operation car is drawn to suitable position by trailer system, then utilize straddle truck lifting handling to storage area to deposit, case beam beam section divides three layers to deposit, monolithic case beam beam section is deposited in adjacent two and is stored up on pedestal, and fulcrum adopts bar shaped pad form.
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| CN106284100A (en) * | 2016-10-13 | 2017-01-04 | 中交路桥华南工程有限公司 | The assembling method of steel truss girder sections and the assembled place used |
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| CN107165053A (en) * | 2017-06-13 | 2017-09-15 | 中国冶集团有限公司 | One kind is without beam installation method between the prefabricated support of bracket |
| CN107165053B (en) * | 2017-06-13 | 2019-06-25 | 中国一冶集团有限公司 | Beam installation method between a kind of prefabricated support of no bracket |
| CN108098979A (en) * | 2017-12-13 | 2018-06-01 | 中国铁建大桥工程局集团有限公司 | A kind of PK sections concrete box girder precast segment template |
| CN109736204A (en) * | 2019-01-26 | 2019-05-10 | 中铁三局集团广东建设工程有限公司 | A kind of precast of segmental beam by short line method construction technology |
| CN109750603A (en) * | 2019-01-26 | 2019-05-14 | 中铁三局集团广东建设工程有限公司 | The Geometry monitoring system and monitoring method constructed in conjunction with segment girder construction short line casting |
| CN110747748A (en) * | 2019-10-30 | 2020-02-04 | 中铁建大桥工程局集团第三工程有限公司 | Arc concrete precast pedestal arch ring segment beam moving construction method |
| CN112065438A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam third section construction method based on karst cave underground river environment tunnel construction |
| CN113954216A (en) * | 2021-11-15 | 2022-01-21 | 中交二航局第四工程有限公司安徽混凝土装配化构件分公司 | Steel die-aluminum die building process for bridge prefabricated part |
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