CN109968520A - A kind of production method of precast plate girder - Google Patents

A kind of production method of precast plate girder Download PDF

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Publication number
CN109968520A
CN109968520A CN201910045552.7A CN201910045552A CN109968520A CN 109968520 A CN109968520 A CN 109968520A CN 201910045552 A CN201910045552 A CN 201910045552A CN 109968520 A CN109968520 A CN 109968520A
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CN
China
Prior art keywords
plate
girder
template
reinforcement cage
steel reinforcement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910045552.7A
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Chinese (zh)
Inventor
袁建成
陆海健
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Haimen Payuan Road Engineering Materials Co Ltd
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Haimen Payuan Road Engineering Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Haimen Payuan Road Engineering Materials Co Ltd filed Critical Haimen Payuan Road Engineering Materials Co Ltd
Priority to CN201910045552.7A priority Critical patent/CN109968520A/en
Publication of CN109968520A publication Critical patent/CN109968520A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043Wire anchoring or tensioning means for the reinforcements

Abstract

The present invention relates to precast plate girder, in particular to a kind of production method of precast plate girder, comprising the following steps: S1, the banding steel cage on horizontal precast pedestal;S2, formwork supporting plate: side template and Side Template are installed respectively in the two sides of steel reinforcement cage and end;S3, it pours: the casting concrete into template;S4, demoulding;S5, maintenance;In step S1, precast pedestal is fixedly installed support plate on the outside of the both ends of steel reinforcement cage, precast pedestal has also been spaced apart auxiliary fagging on the surface below steel reinforcement cage, position of the steel reinforcement cage between support plate rides on auxiliary fagging, steel reinforcement cage is provided with the spacer bar of more horizontal Tiles along the length direction of plate-girder, spacer bar binds the position among steel reinforcement cage on the lower, and the both ends of spacer bar are overlapped on the upper surface of support plate.The present invention is cast in the intermediate position of plate-girder lower plate convenient for the reinforcing bar at plate-girder lower plate, uniformity of the steel reinforcement cage in concrete is improved, to promote the globality of precast plate girder.

Description

A kind of production method of precast plate girder
Technical field
The present invention relates to precast plate girder, in particular to a kind of production method of precast plate girder.
Background technique
In the work progress of current bridge construction, the load-carrying members on bridge top mainly have box beam, T beam and plate-girder, Cast-in-situ Beam and precast beam can be divided into according to the form poured, the connection of Cast-in-situ Beam and structural member is reliable, and globality is strong, but constructs At high cost, the period is long;And the short construction period of precast beam, the relatively good control of the quality poured, it is small to pour difficulty, and it is at low cost, it can With batch production.Therefore at present precast beam using more and more extensive.
Production precast plate girder process the following steps are included: S1, first place precast pedestal, on precast pedestal according to Drawing requirement assembling reinforcement, the later Side Template of branch side template and frame shape;S2, the casting concrete into template, make concrete with The lower bank flush of Side Template, standing of vibrating later in addition place air bag, by air bag after the completion of placement in the cavity of backward reinforcing bar Inflation makes its expansion make Concrete Filled to top plate to form internal chamber wall, then the casting concrete into template, and is pouring At being smoothed out later to top plate face, conserve later;S3, demoulding;S4, tensioning is carried out to the reinforcing bar for stretching out plate-girder end;S4, Grouting under pressure is carried out to the duct among plate-girder.
It is in place of above-mentioned the deficiencies in the prior art, on precast pedestal after assembling reinforcement, reinforcing bar and precast pedestal Upper surface contact, once and after casting concrete, that it is easy to appear the reinforcing bars of downside is exposed outside after precast plate girder molding The case where occur, also need to smear concrete to the bottom of plate-girder in this way after precast plate girder molding and modify, prefabricated board The globality of girder construction is insufficient.
Summary of the invention
The object of the present invention is to provide a kind of production methods of precast plate girder, solve precast plate girder steel reinforcement cage after pouring The exposed situation of meeting occurs, and uniformity of the steel reinforcement cage in concrete is improved, to promote the globality of precast plate girder.
Foregoing invention purpose of the invention has the technical scheme that
A kind of production method of precast plate girder, comprising the following steps: S1, assembling reinforcement: steel is bound on horizontal precast pedestal Muscle cage;S2, formwork supporting plate: side template and Side Template are installed respectively in the two sides of steel reinforcement cage and end;S3, it pours: being poured into template Build concrete;S4, demoulding;S5, maintenance;In step S1, precast pedestal is fixedly installed support plate on the outside of the both ends of steel reinforcement cage, Precast pedestal has also been spaced apart auxiliary fagging on the surface below steel reinforcement cage, and position of the steel reinforcement cage between support plate is taken On auxiliary fagging, steel reinforcement cage is provided with the spacer bar of more horizontal Tiles along the length direction of plate-girder, and spacer bar is tied up The position among steel reinforcement cage on the lower is pricked, and the both ends of spacer bar are overlapped on the upper surface of support plate.
By using above-mentioned technical proposal, spacer bar is supported using support plate, and using auxiliary fagging come The overall weight of spacer bar cage, steel reinforcement cage can be spaced apart with precast pedestal, in this way after casting concrete, reinforcing bar Cage can be fully located at the intermediate position of concrete, guarantee uniformity of the steel reinforcement cage in concrete, to promote precast plate girder Globality.
The present invention is further arranged to: support plate upper end offers locating slot, the position of the locating slot and spacer bar It is corresponding.
Spacer bar is placed on positioning first when working out banding steel cage by using above-mentioned technical proposal After in slot, the position of spacer bar, can be using spacer bar as pedestal during banding steel cage with regard to relatively fixed Assembling reinforcement, the binding efficiency of such reinforcing bar and accuracy all can be higher, while also can be avoided the process in casting concrete Middle steel reinforcement cage meeting relative support plate shifts.
The present invention is further arranged to: steel reinforcement cage exceeds the end of steel reinforcement cage along the reinforcing bar that plate-girder length direction is arranged, Mounting hole compatible with the reinforcing bar of steel reinforcement cage end is exceeded or mounting groove, Side Template are offered in step S2, on Side Template After being installed in place, the soft sealing shroud from the outer cover of reinforcing bar, and sealing shroud is bonded with mounting groove or mounting hole, and it will Pressing plate is threaded on Side Template and pushes down sealing shroud using pressing plate.
By using above-mentioned technical proposal, after the reinforcing bar of steel reinforcement cage is pierced by Side Template, sealing is locked using pressing plate It is pressed at mounting groove or mounting hole, plays the role of sealing Side Template, guarantee that concrete will not be from mounting groove or mounting hole Place leaks out.
The present invention is further arranged to: step S3 is the following steps are included: S31, pour plate-girder bottom plate: pouring into template mixed Solidifying soil, makes the lower bank flush of concrete and Side Template;S32, air bag is inserted into steel reinforcement cage to from Side Template, later by air bag Inflation is heaved, and the both ends of air bag and Side Template seal;S33, continue casting concrete out of upper direction template, first pour beam body two sides Concrete, equilibrium rise, and are layered vibration compacting, then pour concrete roof, finally smooth out top plate top surface.
By using above-mentioned technical proposal, first pours bottom plate and air bag is inserted into steel reinforcement cage again later, the bottom of such air bag Portion can be supported using the concrete of forming bottom plate, guarantee the stabilization of balloon positions, and casting concrete forms again later Also there can be good shape when side plate and top plate.
The present invention is further arranged to: in step s 5, covering is laid on plate-girder top plate, and periodically on plate-girder Water seasoning keeps concrete surface wet.
By using above-mentioned technical proposal, it can reduce the evaporation rate for pouring the moisture on plate-girder using covering, make Plate-girder is able to maintain more long moisture state after primary watering, is conducive to the maintenance of plate-girder.
The present invention is further arranged to: after step s 5 further include step S6, tension reinforcing steel bar: maintenance carries out after completing Tensioning is carried out to the reinforcing bar beyond plate-girder end, and carries out tensioning simultaneously at both ends.
By using above-mentioned technical proposal, before Engineering Structure Component bears external applied load, to the reinforcing bar in tension module Apply pretension with steel strand wires, can be improved the bending resistance and rigidity of component, increase the durability of component.
The present invention is further arranged to: after step s 7 further including step S8, hole path pressure grouting: through pipeline into plate-girder Enhancing perfusion concrete slurry in emptying aperture.
By using above-mentioned technical proposal, the cement slurry in duct can either improve the bearing capacity of plate-girder, when plate-girder by It can reduce the pre-stressed state of presstressed reinforcing steel when power, to protect presstressed reinforcing steel from corrosion, guarantee the resistance to of works Long property.
In conclusion the present invention has following technical effect that by the way that support plate and auxiliary fagging are arranged on precast pedestal, And spacer bar is set on steel reinforcement cage, after spacer bar is erected in support plate and auxiliary fagging in this way, Neng Goubao There are certain height distances between card steel reinforcement cage and precast pedestal, are cast in plate-girder lower plate convenient for the reinforcing bar at plate-girder lower plate Intermediate position, uniformity of the steel reinforcement cage in concrete is improved, to promote the globality of precast plate girder.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of precast pedestal and steel reinforcement cage in the present invention;
Fig. 2 is enlarged drawing at local A in Fig. 1.
In figure, 1, precast pedestal;11, support plate;111, locating slot;12, fagging is assisted;2, steel reinforcement cage;21, supporting steel Muscle.
Specific embodiment
Invention describes a kind of production methods of precast plate girder, include the following steps.
S1, banding steel cage 2.As shown in Figure 1, banding steel cage 2 is carried out on horizontal precast pedestal 1, it is prefabricated The both ends of pedestal 1 in the longitudinal direction are respectively fixed with support plate 11, are also placed on the precast pedestal 1 between support plate 11 auxiliary Help fagging 12;Steel reinforcement cage 2 is provided with the spacer bar 21 of more horizontal Tiles along the length direction of plate-girder, and spacer bar 21 is tied up The position among steel reinforcement cage 2 on the lower is pricked, and the both ends of spacer bar 21 are overlapped on the upper surface of support plate 11, steel reinforcement cage 2 Main part be then be overlapped on auxiliary fagging 12 top.Between the lower end and precast pedestal 1 of steel reinforcement cage 2 after binding in this way With certain gap, in casting process below, the lower end of steel reinforcement cage 2 can be cast in the intermediate position of plate-girder lower plate, Structure of the plate-girder at lower plate is just more uniform in this way, improves uniformity of the steel reinforcement cage in concrete, to be promoted prefabricated The globality of plate-girder.
In addition, as shown in Figure 1, typically being compiled on the basis of spacer bar 21 during banding steel cage 2 System adds spacer bar 21 again and just needs to sling 2 entirety of steel reinforcement cage after otherwise working out again.In order to avoid compilation process Middle spacer bar 21 is subjected to displacement and the steel reinforcement cage 2 of establishment is caused to deform, and can open up locating slot in the upper end of support plate 11 111, spacer bar 21 is both placed in locating slot 111, using locating slot 111 come positioning support reinforcing bar 21.
S2, formwork supporting plate.Side template and Side Template are installed respectively in the two sides of steel reinforcement cage 2 and both ends, due to the reinforcing bar of plate-girder The structure of 2 some situations of cage is more special, for example the presstressed reinforcing steel of plate-girder will be beyond the end of steel reinforcement cage 2, the side of steel reinforcement cage 2 Also part reinforcing bar is had beyond steel reinforcement cage 2.Side Template and side template are when installing it has to be ensured that exceeding the steel of steel reinforcement cage 2 at this time Muscle, which leaks out side template, perhaps Side Template therefore can open up mounting groove or mounting hole in corresponding position in template, by reinforcing bar It is pierced by from mounting groove or mounting hole, after template is installed in place, the soft sealing shroud from the outer cover of the reinforcing bar exceeded, And sealing shroud is bonded with mounting groove or mounting hole, pressing plate is pressed in the top of sealing shroud, and pressing plate is fixed by bolts to In template, Sealing formboard is come with this, guarantees that concrete will not leak out from mounting groove or mounting hole.
Side Template is located between two support plates 11, passes through support plate 11 and reinforcing bar for the ease of Side Template, Side Template Lower end opens up jagged, and the shape of the notch is consistent with the shape of support plate 11, and the upper end of Side Template notch is overlapped on branch 21 top of reinforcing bar is supportted, is additionally provided with sealing plate below Side Template, the notch lid below Side Template is closed closing, sealing plate by the sealing plate Upper end offer slot compatible with spacer bar 21, spacer bar 21 is located at the slot bottom of sealing plate, in the slot of sealing plate preferably also Leakproofness embedded with rubber, in this way convenient for guaranteeing Side Template.
S3, the casting concrete into template.Plate-girder is hollow slab girder, the specific steps are as follows:
S31, pour plate-girder bottom plate: the casting concrete into template makes concrete and Side Template (Side Template frame shape mould herein Plate) lower bank flush;
S32, it is inserted into air bag into steel reinforcement cage 2 to from Side Template, later heaves air bag inflation, the both ends of air bag and Side Template are close Envelope;
S33, continue casting concrete out of upper direction template, first pour beam body two sides concrete, equilibrium rises, and layering is vibrated close It is real, then concrete roof is poured, finally top plate top surface is smoothed out.
It first pours bottom plate air bag is inserted into steel reinforcement cage 2 again later, the bottom of such air bag can utilize forming bottom plate Concrete be supported, guarantee the stabilization of balloon positions, casting concrete moulded side panel and top plate when also can again later Enough there is good shape.
S4, demoulding.After reaching some strength to concrete, using truck crane and hand fit come form removal, demoulding When to touch mold, corner concrete cannot be damaged.
S5, maintenance.Clean water source sprinkling maintenance is used when maintenance, and concrete surface is kept to be in wet state. After watering, the moisture evaporation of concrete surface is too fast, can be laid with covering on plate-girder top plate, utilize covering The effect of blocking of object reduces the evaporation rate of concrete surface moisture, is able to maintain after so that plate-girder is disposably watered more long wet Profit state.Covering can use geotextiles or straw, wherein it is more convenient when utilizing straw, because material is cheap and protects It is moist good.
In general, after carrying out step S1 to step S5, plate-girder can be formed, and also can satisfy general The working condition requirement of condition, but it is directed to special operating condition, it needs just to need to carry out step S6 when stronger bending resistance and rigidity, it is right The presstressed reinforcing steel of plate-girder carries out tensioning.Before Engineering Structure Component bears external applied load, to the reinforcing bar and steel strand in tension module Line applies pretension, so that being applied prestressed stretch-draw component bears compression, and then it is made to generate certain deformation, to cope with The suffered load of structure itself, the bending resistance and rigidity of energy lifting member, increases the durability of component.In step S6 tensioning During, tensioning is carried out to the reinforcing bar beyond plate-girder end, and carry out tensioning simultaneously at both ends, guarantees the same of presstressed reinforcing steel Step property.
In order to promote the prestressing force of steel reinforcement cage 2, need to add pre- answer in steel reinforcement cage 2 during working out steel reinforcement cage 2 Power steel pipe promotes the anti-bending strength and intensity of plate-girder by pre-stressed steel pipe, since presstressed reinforcing steel and prestress pipe are in height Corrosion is easy under pre-stressed state, once the intensity that prestress pipe generation corrosion will lead to plate-girder substantially reduces, durability is just It can be relatively low.In order to reduce a possibility that prestress pipe generates corrosion, the mud jacking in the duct of prestress pipe, mud jacking are needed It is preceding first with pressure clear water rinse will mud jacking duct, then cement slurry is pressed into from the lower one end in duct, from higher one end Underflow rear enclosed is discharged, intensified pressure to 0.5~0.7Mpa, continues 5 minutes, the concrete grout in such duct can be more later It is closely knit, it is less prone to bubble.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the scope of the claims of invention.

Claims (7)

1. a kind of production method of precast plate girder, comprising the following steps: S1, assembling reinforcement: on horizontal precast pedestal (1) Banding steel cage (2);S2, formwork supporting plate: side template and Side Template are installed respectively in the two sides of steel reinforcement cage (2) and end;S3, it pours It builds: the casting concrete into template;S4, demoulding;S5, maintenance;It is characterized in that, precast pedestal (1) is in steel in step S1 It is fixedly installed support plate (11) on the outside of the both ends of muscle cage (2), precast pedestal (1) is also put on the surface below steel reinforcement cage (2) It is equipped with auxiliary fagging (12), steel reinforcement cage (2) is located at the position between support plate (11) and rides in auxiliary fagging (12), steel reinforcement cage (2) spacer bar (21) of more horizontal Tiles is provided with along the length direction of plate-girder, spacer bar (21) is bound in reinforcing bar The intermediate position on the lower of cage (2), and the both ends of spacer bar (21) are overlapped on the upper surface of support plate (11).
2. a kind of production method of precast plate girder according to claim 1, which is characterized in that support plate (11) upper end opens up Have locating slot (111), the locating slot (111) is corresponding with the position of spacer bar (21).
3. a kind of production method of precast plate girder according to claim 1, which is characterized in that steel reinforcement cage (2) is long along plate-girder The reinforcing bar for spending direction setting exceeds the end of steel reinforcement cage (2), offers in step s 2, on Side Template and exceeds steel reinforcement cage (2) The compatible mounting hole of the reinforcing bar of end or mounting groove, it is soft from the outer cover of reinforcing bar after Side Template is installed in place Sealing shroud, and sealing shroud is bonded with mounting groove or mounting hole, and pressing plate is threaded on Side Template and utilizes pressing plate Push down sealing shroud.
4. a kind of production method of precast plate girder according to claim 1, which is characterized in that step S3 includes following step Rapid: S31, pour plate-girder bottom plate: the casting concrete into template makes the lower bank flush of concrete and Side Template;S32, Xiang Cong Side Template is inserted into air bag into steel reinforcement cage (2), later heaves air bag inflation, and the both ends of air bag and Side Template seal;S33, from Continue casting concrete in upper direction template, first pour beam body two sides concrete, equilibrium rises, and is layered vibration compacting, then pour top Board concrete finally smoothes out top plate top surface.
5. a kind of production method of precast plate girder according to claim 1, which is characterized in that in step s 5, in plate-girder It is laid with covering on top plate, and the periodically water seasoning on plate-girder, keeps concrete surface wet.
6. a kind of production method of precast plate girder according to claim 3, which is characterized in that further include after step s 5 Step S6, tension reinforcing steel bar: maintenance complete after carry out to beyond plate-girder end reinforcing bar carry out tensioning, and both ends simultaneously into Row tensioning.
7. a kind of production method of precast plate girder according to claim 6, which is characterized in that further include after step s 7 Step S8, hole path pressure grouting: by pipeline into the duct of plate-girder enhancing perfusion concrete slurry.
CN201910045552.7A 2019-01-17 2019-01-17 A kind of production method of precast plate girder Pending CN109968520A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111469252A (en) * 2020-04-17 2020-07-31 罗智 Double-layer inflatable membrane concrete formwork system and construction method thereof
CN111926974A (en) * 2020-08-20 2020-11-13 福建宏盛建设集团有限公司 Precast slab construction method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2239119A2 (en) * 2009-04-07 2010-10-13 Thomas Friedrich Mobile tensioning bed for prestressed concrete products
CN105128131A (en) * 2015-07-29 2015-12-09 黑龙江省龙建路桥第三工程有限公司 Method for manufacturing prestressed hollow slab beam through polystyrene foam
CN106042173A (en) * 2016-06-02 2016-10-26 中铁十六局集团铁运工程有限公司 Bridge production system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2239119A2 (en) * 2009-04-07 2010-10-13 Thomas Friedrich Mobile tensioning bed for prestressed concrete products
CN105128131A (en) * 2015-07-29 2015-12-09 黑龙江省龙建路桥第三工程有限公司 Method for manufacturing prestressed hollow slab beam through polystyrene foam
CN106042173A (en) * 2016-06-02 2016-10-26 中铁十六局集团铁运工程有限公司 Bridge production system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111469252A (en) * 2020-04-17 2020-07-31 罗智 Double-layer inflatable membrane concrete formwork system and construction method thereof
CN111926974A (en) * 2020-08-20 2020-11-13 福建宏盛建设集团有限公司 Precast slab construction method

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