CN108560426A - Prevent floating construction method in combined box beam internal model - Google Patents
Prevent floating construction method in combined box beam internal model Download PDFInfo
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- CN108560426A CN108560426A CN201810489814.4A CN201810489814A CN108560426A CN 108560426 A CN108560426 A CN 108560426A CN 201810489814 A CN201810489814 A CN 201810489814A CN 108560426 A CN108560426 A CN 108560426A
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- 238000009434 installation Methods 0.000 claims abstract description 18
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- 238000000465 moulding Methods 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 230000003014 reinforcing Effects 0.000 claims description 39
- 238000005452 bending Methods 0.000 claims description 23
- 239000011901 water Substances 0.000 claims description 11
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- 210000002356 Skeleton Anatomy 0.000 claims description 6
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- 239000003973 paint Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 230000003373 anti-fouling Effects 0.000 claims description 4
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
Description
Technical field
The present invention relates to precast concrete fields, prevent combined box beam internal model floating from applying more specifically, it is related to one kind Work method.
Background technology
Combined box beam is a kind of bridge structure form more commonly used in bridge construction process, in numerous bridge constructions In be widely used.
The prior art is very easy in the process poured into a mould combined box beam there is a situation where internal model floating, interior Mould, which floats, can cause the top plate thickness of combined box beam insufficient so that concrete is insufficient to the protection of reinforcing bar so that prefabricated case beam holds Easily there is accident, in order to solve the problems, such as that prefabricated box girder inner formwork floats, is added at the top of roof steel bar in the prior art multigroup Then the shoulder pole girder being connected with external mold downwards pushes up internal model using shoulder pole girder as the down-set adjustable screw rod of support Tightly.
Although existing this method can effectively reduce the floating of internal model, because screw rod is in roof steel bar It passes through, is pouring concrete and again extracting screw rod in concrete after concrete tentatively solidification, leading to combination box Back plate has several apertures and concrete does not solidify thoroughly in the process for extracting reinforcing bar, is easy to work as in the process of extraction In concrete is caused to damage, to lower the intensity of combined box beam top plate.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide one kind to prevent combined box beam internal model floating from applying Work method can either prevent internal model from floating, and not pass through concrete combined box beam, thus will not be at the top of combined box beam It leaves aperture concrete will not be caused to damage, to reduce the intensity of concrete combined box beam top plate.
To achieve the above object, the present invention provides following technical solutions：One kind preventing the floating construction of combined box beam internal model Method includes the following steps：
（1）Precast pedestal：The preparation of precast pedestal is carried out using concrete, the requirement of caisson platform precasting has enough for the lower layer of pedestal Rigidity, and pedestal needs be placed on the ground with excellent support effect, the pedestal in entire work progress Sinking can not be more than 2mm；
（2）Bottom die of box-beam is installed on pedestal：Bed die is processed by steel plate, is directly installed on precast pedestal, the two of bed die End is welded with the fixed ring for steel wire rope to be fixed；
（3）Bottom, web reinforcement and fixed web corrugation pipe are bound on moulding bed：Blanking and curved is carried out to reinforcing bar according to drawing first Song, then bottom, web reinforcement binding are carried out on moulding bed, it is typically improved using weldering combination is tied up in the process that reinforcing bar is bound Bottom, web reinforcement entirety soundness；If the position of the position of web corrugation pipe and reinforcing bar in the process of practical operation It clashes, adjusts the position of skeleton reinforcing steel bar, ensure that the position of web corrugation pipe coincide with design position；To web corrugation pipe It is attached and is the need to ensure that bellows seam crossing is tight, web corrugation pipe junction is more than web corrugation pipe 5mm using diameter Casing be sleeved on seam crossing and be attached；
（4）Polishing template：Mainly by the template surface of external mold rusty stain and last casting complete after remained on surface Mucilage remove it is clean；
（5）Smearing release agent：In uniform smearing release agent on clean outer mould surface of polishing, coagulation after terminating convenient for cast Native box beam is detached from external mold；
（6）External mold is installed：External mold is made of side form, outer mould bases, external mold diagonal brace etc., will be on bed die in the process of installation external mold Fixed ring it is exposed, be convenient for construction in later period；
（7）Integral hoisting bottom, web reinforcement：It is lifted into bottom, web reinforcement are whole on bed die, prevents in the mistake lifted Cheng Dangzhong reinforcing bars deform；
（8）End head formwork is installed：It needs the surface cleaning by end head formwork clean before installation end head formwork, ensures end head formwork Surfacing is bright and clean, no concave-convex deforms and remaining mucilage；The designated position of mould lifting will be held after cleaning out using suspender, Then bolt is utilized to connect end mould with side form with bed die and end mould；By the gap and end between end head formwork and interior external mold Gap between head reinforcing bar and end mould is blocked using foam gap filler；
（9）Internal model is installed：Two length directions branch identical with internal model length direction is fixed in inner cavity top both sides among internal model Strut, and the inner cavity of internal model is stretched out at the both ends of supporting rod；It needs to clear up the template of internal model before internal model installation, clearly Except the remaining mucilage and rusty stain of inner mould surface, uniform smearing release agent after cleaning out；
（10）Roof steel bar and fixed hogging moment bellows are bound on moulding bed：Blanking and curved is carried out to reinforcing bar according to drawing requirement Song is typically all to be combined using tying up weldering in the process that roof steel bar is bound on moulding bed, improves the soundness of roof steel bar； If the position of hogging moment bellows and the position of reinforcing bar clash in the process of practical operation, the position of skeleton reinforcing steel bar is adjusted It sets, ensures that the position of hogging moment bellows coincide with design position；It needs to ensure when being attached hogging moment bellows negative Moment of flexure bellows seam crossing is tight, and casing of the hogging moment bellows junction using diameter more than hogging moment bellows 5mm is sleeved on Seam crossing is attached；
（11）Roof steel bar integral hoisting：By being lifted into above internal model for the roof steel bar bound entirety, what is lifted Prevent bar bending from deforming in process；
（12）External mold fixed frame in installation：The installation of external mold fixed frame in external mold both ends carry out, interior external mold fixed frame is by internal model On the end of supporting rod and the end of external mold link together, using being connected by the way of threaded connection in the process of connection It connects；In order to improve the stability of interior external mold connection, interior external mold fixed frame is attached by more bolts with external mold；
（13）Connecting steel wire ropes and strainer：Two steel wire ropes, two steel are connected on connection boom end and fixed ring respectively Cord is connected by strainer, and strainer tenses two steel wire ropes so that steel wire rope is in tensioned state；
（14）Pour concrete：To concrete is poured into a mould between internal model and external mold, constantly vibrate to concrete in casting process, So that concreting uniformly and by the bubble that concreting process generates vibrates；
（15）Form removal：The concrete strength poured can reach its surface when do not collapse with crack, to internal model and Side form is removed, and steel wire rope, strainer and interior external mold fixed frame are first removed in the process of dismounting, then removes internal model, External mold is finally removed, is all first demounting bolt in the process of dismounting, it is then careful to dismantle internal model and each section of external mold Under；
（16）Health：Water pipe is all set in two coxostermums, top plate and the inside of box beam, nozzle is set on water pipe, utilizes water pump Pressurization sprays box beam；It needs to ensure that each part of beam body can keep moistening, the time of health is generally many Yu Qitian；Health carries out prestressed stretch-draw to box beam again after terminating.
By using above-mentioned technical proposal, can be incited somebody to action by interior external mold fixed frame and the supporting rod being fixed in internal model Internal model is fixed together with external mold, prevents internal model from floating during pouring into a mould concrete；And it will be consolidated by steel wire rope Determine ring to link together with supporting rod, by strainer by steel wire tensioning, further prevents internal model in the process of cast There is On The Floating；It does not have screw rod while preventing internal model from floating or other components is inserted into box beam concrete, It prevents that concrete is caused to damage.
The present invention is further arranged to：The step（3）In on moulding bed carry out bottom, web reinforcement binding before need Rebar surface is cleaned, removes oil stain, paint dirt, outer skin and iron rust of rebar surface etc., the process for carrying out iron rust removing is worked as In wire brush may be used be purged.
By using above-mentioned technical proposal, before carrying out steel reinforcement cage binding to the oil stain of rebar surface, paint is dirty, outer skin with And iron rust is removed totally, and the corrosion rate after reinforcing bar is poured into concrete can be slowed down.
The present invention is further arranged to：The step（3）When carrying out blanking and bending to reinforcing bar, in the process of reinforcing bar bending It is bent in the middle using numerical-control bending machine, ensures the precision of bending angle.
By using above-mentioned technical proposal, it is to be not easy to control the angle of bending manually to carry out bending to reinforcing bar, The precision of bar bending angle can be improved by carrying out bending using numerical-control bending machine, to improve the quality of steel reinforcement cage binding.
The present invention is further arranged to：The step（3）In by welding semicircle in the design path of web corrugation pipe The locating framework of shape positions web corrugation pipe.
It, can be preferably to web corrugation by way of welding semicircle locating framework by using above-mentioned technical proposal Pipe is positioned, and the installation accuracy of web corrugation pipe is improved, to improve the casting quality of combined box beam.
The present invention is further arranged to：The step（14）In poured before check blending station, supply line, gantry Whether the running gear and lifting component use state hung be intact.
By using above-mentioned technical proposal, before being poured into a mould to blending station, supply line, gantry crane running gear And lifting component memory inspection, timely failure can be excluded, prevent equipment failure when work from influencing combination The quality and efficiency of box beam cast.
The present invention is further arranged to：The step（14）In be inserted into internal diameter in the bellows duct and be less than in bellows The plastic conduit of diameter 5mm, the continuous slide plastic pipe in the process poured.
By using above-mentioned technical proposal, concrete is easy to enter by the seam crossing of bellows in the process of cast In bellows, plastic conduit is inserted into bellows and constantly push-and-pull can prevent from entering in the process of cast Concrete in bellows is by ripple blockage.
The present invention is further arranged to：The step（14）Using antifouling limiting slot to pouring in the process poured It builds and is limited.
By using above-mentioned technical proposal, the concrete in casting process is limited by using antifouling limiting slot It can prevent from falling in roof steel bar when concrete is fallen at the top of not being poured into the process of cast, roof steel bar is made At pollution.
The present invention is further arranged to：The step（16）In conserved during top plate need to be covered with geotextiles Lid.
By using above-mentioned technical proposal, the top plate of combined box beam is because can be by the direct projection of the sun, the water ratio on spray It is easier to evaporation to do, can slow down the speed that combined box beam top plate goes out moisture evaporation by being laid with geotextiles, improve combined box beam Health effect at top plate.
In conclusion the present invention has the advantages that compared with the prior art：
1, the present invention can either prevent internal model by external mold link, connecting rod, fixed ring, steel wire rope and strainer in setting It floats, and concrete will not be caused because of the components such as screw rod are inserted into the concrete of box beam in the process for pouring concrete Damage；
2, the present invention cleans out the oil stain of rebar surface, paint dirt, outer skin and iron rust etc. before carrying out steel reinforcement cage binding, energy Enough slow down the speed of steel bar corrosion after reinforcing bar is poured into concrete.
3, the present invention can preferably position web corrugation pipe by way of welding semicircle locating framework, carry High web corrugation pipe installation accuracy, to improve the casting quality of combined box beam.
Specific implementation mode
Embodiment：One kind prevents floating construction method in combined box beam internal model, specific method and step as follows：
（1）Precast pedestal：The preparation of precast pedestal is carried out using concrete, the requirement of caisson platform precasting has enough for the lower layer of pedestal Rigidity, and pedestal needs be placed on the ground with excellent support effect, the pedestal in entire work progress Sinking can not be more than 2mm；
（2）Bottom die of box-beam is installed on pedestal：Bed die is processed by steel plate, is directly installed on precast pedestal, the two of bed die End is welded with the fixed ring for steel wire rope to be fixed；
（3）Bottom, web reinforcement and fixed web corrugation pipe are bound on moulding bed：Needed to bar list before the binding of reinforcing bar Face is cleaned, and is removed oil stain, paint dirt, outer skin and iron rust of rebar surface etc., can be adopted in the process of iron rust removing It is purged with wire brush；When carrying out blanking and bending to reinforcing bar, the cutting length needs of reinforcing bar are carried out according to layout design Accurate discharge, and be bent using numerical-control bending machine in the process of reinforcing bar bending, ensure the precision of bending angle； It is typically all to use tie up, weld combination in the process that reinforcing bar is bound on moulding bed, improves bottom, the entirety of web reinforcement consolidates journey Degree；It can be by welding semicircular locating framework in the design path of bellows to web corrugation pipe on bottom, web reinforcement It is positioned；If the position of web corrugation pipe and the position of reinforcing bar clash in the process of practical operation, skeleton is adjusted The position of reinforcing bar ensures that the position of web corrugation pipe coincide with design position；It is to need to protect being attached to web corrugation pipe Card bellows seam crossing is tight, and casing of the web corrugation pipe junction using diameter more than web corrugation pipe 5mm is sleeved on seam crossing It is attached；
（4）Polishing template：Mainly the mucilage of the rusty stain on surface and remained on surface after last casting complete is removed Totally；
（5）Smearing release agent：In uniform smearing release agent on clean outer mould surface of polishing, coagulation after terminating convenient for cast Native box beam is detached from external mold；
（6）External mold is installed：External mold is made of side form, outer mould bases, external mold diagonal brace etc., will be on bed die in the process of installation external mold Fixed ring it is exposed, be convenient for construction in later period；
（7）Integral hoisting bottom, web reinforcement：Bottom, web reinforcement are lifted into using the suspenders such as truss are whole on bed die, utilized Truss, which carries out lifting, can prevent from occurring in the process lifted the deformation of reinforcing bar；
（8）End head formwork is installed：It needs the surface cleaning by end head formwork clean before installation end head formwork, ensures end head formwork Surfacing is bright and clean, no concave-convex deforms and remaining mucilage；The designated position of mould lifting will be held after cleaning out using suspender, Then bolt is utilized to connect end mould with side form with bed die and end mould；By the gap and end between end head formwork and interior external mold Gap between head reinforcing bar and end mould is blocked using foam gap filler；
（9）Internal model is installed：Two length directions branch identical with internal model length direction is fixed in inner cavity top both sides among internal model Strut, and the inner cavity of internal model is stretched out at the both ends of supporting rod；It needs to clear up the template of internal model before internal model installation, clearly Except the remaining mucilage and rusty stain of inner mould surface, uniform smearing release agent after cleaning out；
（10）Roof steel bar and fixed hogging moment bellows are bound on moulding bed：Needed to reinforcing bar before the binding of roof steel bar Surface is cleaned, and oil stain, the paint for removing rebar surface be dirty, outer skin and iron rust etc., and carrying out in the process of iron rust removing can be with It is purged using people's wire brush；When carrying out blanking and bending to reinforcing bar, the cutting length of reinforcing bar need according to layout design come Accurate discharge is carried out, and is bent using numerical-control bending machine in the process of reinforcing bar bending, ensures the essence of bending angle Accuracy；It is typically all to use to tie up weldering combination in the process that roof steel bar is bound on moulding bed, improves the firm journey of roof steel bar Degree；By welding semicircular locating framework in the design path of hogging moment bellows to hogging moment ripple in roof steel bar Pipe is positioned；If the position of hogging moment bellows and the position of reinforcing bar clash in the process of practical operation, adjustment The position of skeleton reinforcing steel bar ensures that the position of hogging moment bellows coincide with design position；It is attached to hogging moment bellows When need ensure hogging moment bellows seam crossing it is tight, hogging moment bellows junction using diameter be more than hogging moment bellows The casing of 5mm is sleeved on seam crossing and is attached；
（11）Roof steel bar integral hoisting：Be lifted into above internal model using truss by the roof steel bar bound is whole, into Prevent from causing the flexural deformation of reinforcing bar in the process of row lifting；
（12）External mold fixed frame in installation：The installation of external mold fixed frame in external mold both ends carry out, interior external mold fixed frame is by internal model On the end of supporting rod and the end of external mold link together, using being connected by the way of threaded connection in the process of connection It connects；In order to improve the stability of interior external mold connection, interior external mold fixed frame is attached by more bolts with external mold；
（13）Connecting steel wire ropes and strainer：Two steel wire ropes, two steel are connected on connection boom end and fixed ring respectively Cord is connected by strainer, and strainer tenses two steel wire ropes so that steel wire rope is in tensioned state；
（14）Pour concrete：Check that blending station, supply line, the running gear of gantry crane and lifting component make before being poured It is whether intact with state；Concrete water mud enters in bellows in the process poured in order to prevent so that ripple Blockage can not carry out the tensioning in later stage, it should the hard that internal diameter is less than inside diameter of bel 5mm is inserted into bellows duct Plastic tube, the continuous slide plastic pipe in the process poured prevent the duct of bellows from generating blocking；What is poured It is limited using antifouling limiting slot to pouring in process, prevents concrete from being polluted to reinforcing bar；It is continuous in casting process It vibrates to concrete so that concreting uniformly and by the bubble that concreting process generates vibrates；
（15）Form removal：The concrete strength poured can reach its surface when do not collapse with crack, to internal model and Side form is removed, and steel wire rope, strainer and interior external mold fixed frame are first removed in the process of dismounting, then removes internal model, External mold is finally removed, is all first demounting bolt in the process of dismounting, is then torn open in careful each section by internal model and external mold It unloads；
（16）Health：Water pipe is all set in two coxostermums, top plate and the inside of box beam, nozzle is set on water pipe, utilizes water pump Pressurization sprays box beam；It needs to ensure that each part of beam body can keep moistening, top plate needs to use during maintenance Geotextiles are covered, the generally no less than seven days time of health；Health carries out prestressed stretch-draw to box beam again after terminating.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.
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| CN207344808U (en) * | 2017-09-20 | 2018-05-11 | 中铁二十二局集团第三工程有限公司 | A kind of draw type steel internal mould |
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| CN101538894A (en) * | 2009-03-20 | 2009-09-23 | 湖南省沙坪建筑有限公司 | Construction method for resisting uplift in internal mold of concrete box |
| CN105345926A (en) * | 2015-09-25 | 2016-02-24 | 安徽水利开发股份有限公司 | Prefabricated construction method for prestressed concrete box girder |
| CN105714684A (en) * | 2016-02-24 | 2016-06-29 | 中国一冶集团有限公司 | Prestressed concrete variable cross-section fish-bellied type continuous box girder construction method |
| CN107471414A (en) * | 2017-09-20 | 2017-12-15 | 中铁二十二局集团第三工程有限公司 | A kind of construction method of draw type steel internal mould and pre-cast hollow slab |
| CN207344808U (en) * | 2017-09-20 | 2018-05-11 | 中铁二十二局集团第三工程有限公司 | A kind of draw type steel internal mould |
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