CN107090777A - A kind of T beam manufacture methods for reducing blibbing - Google Patents
A kind of T beam manufacture methods for reducing blibbing Download PDFInfo
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- CN107090777A CN107090777A CN201710412004.4A CN201710412004A CN107090777A CN 107090777 A CN107090777 A CN 107090777A CN 201710412004 A CN201710412004 A CN 201710412004A CN 107090777 A CN107090777 A CN 107090777A
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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Abstract
The invention discloses a kind of T beam manufacture methods for reducing blibbing, comprise the following steps：The beam prefabricated frame structure construction of A, T；B, installation wall-attachment vibrator；C, concreting：Comprise the following steps：C1, pour the first layer concrete；C2, pour the second layer concrete；C3, pour third layer concrete；C4, pour the 4th layer concrete；D, form removal, and carry out dabbing processing；E, concrete curing.The present invention has the characteristics of can effectively reducing T beam blibbings quantity, raising T beams presentation quality and reduction production cost.
Description
Technical field
The present invention relates to a kind of T beams manufacture method, particularly a kind of T beam manufacture methods for reducing blibbing.
Background technology
Install for convenience, bridge is typically all to use prefabricated PC concrete structure, continuous using structure after first freely-supported
System.The making of existing T beams generally comprises the processes such as making, the concreting of template framework structure, and concrete is being poured
During can produce more bubble, the bubbles volume that so will result in T beams surface is more and bubble be relatively large in diameter so that
The presentation quality of T beams is poor, and influence is checked and accepted；And also need to carry out processing of doing over again to T beams surface, add workman's work strong
Degree, improves production cost.
The content of the invention
It is an object of the present invention to provide a kind of T beam manufacture methods for reducing blibbing.The present invention has can be effective
The characteristics of reducing T beam blibbings quantity, improve T beams presentation quality and reduce production cost.
Technical scheme：A kind of T beam manufacture methods for reducing blibbing, comprise the following steps：
The beam prefabricated frame structure construction of A, T；
B, installation wall-attachment vibrator：One group of high frequency wall-attachment is installed in the horseshoe position of the beam prefabricated frame structures of T to vibrate
Device, one group of low frequency wall-attachment vibrator is installed at the middle part of the web of the beam prefabricated frame structures of T；Adjacent high frequency wall-attachment vibrates
The spacing of device is 1.2-1.8 meters, and the spacing of adjacent low frequency wall-attachment vibrator is 1.2-1.8 meters；
C, concreting：Comprise the following steps：
C1, pour the first layer concrete：Concreting is controlled to the horseshoe position of the beam prefabricated frame structures of T, Ran Hougao
Frequency wall-attachment vibrator is vibrated, while carrying out human assistance by poker vibrator；
C2, pour the second layer concrete：Concreting is controlled to the centre position of the web of the beam prefabricated frame structures of T,
Then low frequency wall-attachment vibrator is vibrated, while carrying out human assistance by poker vibrator；
C3, pour third layer concrete：Control web and wing plate boundary position of the concreting to the beam prefabricated frame structures of T
Put, then vibrated by poker vibrator；
C4, pour the 4th layer concrete：Control concrete is poured on the outside of the wing plate of the beam prefabricated frame structures of T to inner side,
Then vibrated by poker vibrator；
D, form removal, and carry out dabbing processing；
E, concrete curing.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the high frequency wall-attachment vibrator in the step c1
The frequency 175-185HZ that vibrates, vibrating time is 18-20s；The frequency of vibrating of low frequency wall-attachment vibrator in the step c2
48-52HZ, vibrating time is 20-22s.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the thickness of the first layer concrete in the step C
For 400-500mm, the thickness of the second layer concrete is 500-600mm, and the thickness of third layer concrete is 500-600mm, the 4th
The thickness of layer concrete is 300-400mm.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the high frequency wall-attachment vibrator in the step c1
Open opportunity be concreting to the beam prefabricated frame structures of T horseshoe position when；Low frequency wall-attachment in the step c2
The unlatching opportunity of vibrator be concreting to web centre position when.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the concrete of the concrete includes water, mud, sand, broken
Mass ratio between stone, flyash and additive, and water, mud, sand, rubble, flyash and additive is 152：416：709：
1064：74：4.9；A diameter of 5-31.5mm of the flyash；Described additive is high performance water reducing agent of polyocarboxy acid.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the slump of the concrete is controlled in 190-
205mm scopes.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the poker vibrator in the step C is vibration
Rod, vibrating head sinks to concrete naturally, and slotting spacing of the vibrating head is 1.2-1.5 times of vibrating head useful effect radius,
The close time of shaking of each vibrating head for inserting point for 20-30s, shake close operation when 5-10cm will be twitched above and below vibrating head, vibrate stick
The depth of body insertion concrete is the 2/3-3/4 of vibrating head barred body length.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the beam prefabricated frame structure constructions of T in the step A
Step is followed successively by stirrup at installation horseshoe, longitudinal reinforcement at web moulding bed, web hooping, lengthways main steel bar, web moulding bed at horseshoe
Outside longitudinal reinforcement, web lacing wire, then carry out bellows installation, anchorage installation and model sheetinstallat；After described model sheetinstallat
Releasing agent is coated in template surface.
In a kind of T beam manufacture methods of foregoing reduction blibbing, described releasing agent includes machine oil and diesel oil, and machine
Oil and diesel oil press 3：7 volume ratio configuration.
In a kind of T beam manufacture methods of foregoing reduction blibbing, the dabbing carried out in the step D is processed as waiting to mix
When solidifying soil intensity reaches 10MPa, dabbing is carried out to surface at beam end, diaphragm plate, flange plate using handheld pneumatic dabbing machine；
Described dabbing is deep-controlled to control the scope that concrete outer ledge reserves 20-30mm in 3-5mm, dabbing without dabbing
Processing.
Compared with prior art, the present invention installs high frequency wall-attachment vibrator in horseshoe position, in web centre position peace
Fill low frequency wall-attachment vibrator, by strictly control high frequency wall-attachment vibrator and low frequency wall-attachment vibrator installation site,
The opportunity vibrated and the time vibrated, pass through high frequency wall-attachment vibrator, low frequency wall-attachment vibrator and internal vibration
The triple of device are vibrated, and can effectively improve the compactness of concrete, improve the discharge rate of bubble and discharge speed in casting process
Degree；By rationally controlling the order poured, and coordinate the opportunity and time vibrated, be conducive to the discharge of bubble, reduce bubble
Diameter, improves the quality on T beams surface.By above-mentioned manufacture casting craft, can by the qualification rate of bubble from 49.3% improve to
92%, the number of bubbles that concrete surface diameter is more than 8mm is significantly reduced, and improves presentation quality, reduces frequency of doing over again, saving
Increased man-hour and expense because doing over again, reduce production cost；With preferable Social benefit and economic benefit.To sum up institute
State, the present invention, which has, can effectively reduce T beam blibbings quantity, improve T beams presentation quality and reduce the spy of production cost
Point.
In addition, the present invention coats releasing agent by template surface, it ensure that template surface is smooth, be unfavorable for the suction of bubble
It is attached, it is easy to the discharge of bubble；By being optimized to the concrete proportioning in concrete, the ratio of mud in regulation concrete so that coagulation
Native denseness is moderate, the size and spacing of bubble in reduction concrete, and the straight of T beam blibbings is reduced so as to effective from source
Footpath and quantity.
Embodiment
With reference to embodiment, the present invention is further illustrated, but is not intended as to the foundation of the invention limited.
Embodiment.A kind of T beam manufacture methods for reducing blibbing, comprise the following steps：
The beam prefabricated frame structure construction of A, T；
B, installation wall-attachment vibrator：One group of high frequency wall-attachment is installed in the horseshoe position of the beam prefabricated frame structures of T to vibrate
Device, one group of low frequency wall-attachment vibrator is installed at the middle part of the web of the beam prefabricated frame structures of T；Adjacent high frequency wall-attachment vibrates
The spacing of device is 1.2-1.8 meters, and the spacing of adjacent low frequency wall-attachment vibrator is 1.2-1.8 meters；
C, concreting：Comprise the following steps：
C1, pour the first layer concrete：Concreting is controlled to the horseshoe position of the beam prefabricated frame structures of T, Ran Hougao
Frequency wall-attachment vibrator is vibrated, while carrying out human assistance by poker vibrator；
C2, pour the second layer concrete：Concreting is controlled to the centre position of the web of the beam prefabricated frame structures of T,
Then low frequency wall-attachment vibrator is vibrated, while carrying out human assistance by poker vibrator；
C3, pour third layer concrete：Control web and wing plate boundary position of the concreting to the beam prefabricated frame structures of T
Put, then vibrated by poker vibrator；
C4, pour the 4th layer concrete：Control concrete is poured on the outside of the wing plate of the beam prefabricated frame structures of T to inner side,
Then vibrated by poker vibrator；
D, form removal, and carry out dabbing processing；
E, concrete curing.
The frequency 175-185HZ that vibrates of high frequency wall-attachment vibrator in the step c1, vibrating time is 18-20s；Institute
The frequency 48-52HZ that vibrates of the low frequency wall-attachment vibrator in step c2 is stated, vibrating time is 20-22s.
The thickness of the first layer concrete in the step C is 400-500mm, and the thickness of the second layer concrete is 500-
600mm, the thickness of third layer concrete is 500-600mm, and the thickness of the 4th layer concrete is 300-400mm.
The unlatching opportunity of high frequency wall-attachment vibrator in the step c1 is concreting to the beam prefabricated frame structures of T
Horseshoe position when；The unlatching opportunity of low frequency wall-attachment vibrator in the step c2 is concreting to web interposition
When putting.
The concrete of the concrete includes water, mud, sand, rubble, flyash and additive, and water, mud, sand, rubble, flyash
Mass ratio between additive is 152：416：709：1064：74：4.9；A diameter of 5-31.5mm of the flyash；It is described
Additive be high performance water reducing agent of polyocarboxy acid.
The slump of the concrete is controlled in the range of 190-205mm.
Poker vibrator in the step C is vibrating head, vibrating head sinks to concrete naturally, and the vibrating head is inserted
Point spacing is located at 1.2-1.5 times of vibrating head useful effect radius, and the close time of shaking of each vibrating head for inserting point shakes for 20-30s
5-10cm will be twitched during close operation above and below vibrating head, the depth of vibrating head barred body insertion concrete is the 2/ of vibrating head barred body length
3-3/4。
The beam prefabricated frame structure construction steps of T are followed successively by stirrup at installation horseshoe, longitudinal direction at web moulding bed in the step A
Reinforcing bar, web hooping, lengthways main steel bar at horseshoe, longitudinal reinforcement, web lacing wire on the outside of web moulding bed, then carry out bellows peace
Dress, anchorage installation and model sheetinstallat；After described model sheetinstallat releasing agent is coated in template surface.
Described releasing agent includes machine oil and diesel oil, and machine oil and diesel oil press 3：7 volume ratio configuration.
The dabbing carried out in the step D is processed as when concrete strength reaches 10MPa, using handheld pneumatic dabbing
Machine carries out dabbing to surface at beam end, diaphragm plate, flange plate；Described dabbing is deep-controlled to be controlled to mix in 3-5mm, dabbing
The scope that solidifying soil outer ledge reserves 20-30mm is handled without dabbing.
The number of assembling steps of T beam frame structures：This T beam forms is divided into four bulks and two fritters per side, at diaphragm plate
Disconnect, each piece is used as an entirety.T beam forms absolute altitudes are adjusted, both sides are symmetrically spelled during template assembly with tie plate in place
Dress, with high-strength bolt connection in place.Two ends head plate and envelope diaphragm plate end plate are adjusted again.Formwork reinforcement is completed after acceptance(check)
Colligation tooth plate and wing plate reinforcing bar again.Pour and be divided into 4 layers, first layer is poured to horseshoe (40~50cm), the second layer is poured to abdomen
In the middle part of plate (50~60cm), third layer is poured to junction (50~60cm) at the top of wing plate bottom web, and the 4th layer pours to whole
Individual wing plate (about 30~40cm).First layer notes concrete distributing order, using one end to other end layer-by-layer distribution in construction, and
End is strengthened vibrating in time compared with 20~50cm in the middle part of the preferably many cloth eminence beams of Wide Band Oxygen Sensors, concrete compaction is ensured anchorage
Position concrete density.Artificial vibrator draws material at pump line, is vibrated followed by artificial vibrator, reaches certain pour highly
Afterwards, attached wall vibrator is opened, attached wall vibrator is opened using special messenger commander, and the control opening time is in 20s or so.
It should be noted that making vibrating head sink to concrete naturally in operation, and 5~10cm in the not yet pre-hardening layer of lower floor is inserted into, to promote
Make levels to mutual gluing.When poker vibrator vibrates, in addition to accomplishing to insert slow pull out soon, each slotting spacing of vibrating head should be equal
It is even.It should not neglect and far neglect closely.1.5 times of vibrating head useful effect radius are not to be exceeded in general spacing.Vibrating head shakes in concrete
Close time, the typically often slotting close 20~30s that shakes no longer significantly is sunk with concrete, bubble no longer occurs, cement is routed up on surface
Untill slurry and appearance uniform, 5~10cm should will be twitched above and below vibrating head when shaking close, concrete is shaken close uniform；Barred body is inserted
Rod length 2/3~3/4 is not to be exceeded in the depth of concrete, in order to avoid cause protection flexible pipe to damage because vibrating head is not drawn out easily；Mustn't
Protection flexible pipe is inserted in concrete, protects flexible pipe and mortar to penetrate into flexible pipe to prevent mortar etch and damages parts.
T beams bottom, web reinforcement colligation
(1) T beams bottom, web reinforcement use mold colligation on girder prefabricated pedestal processed, and T beams roof steel bar is good in model sheetinstallat
Scene completes colligation afterwards.
T beams bottom, web reinforcement colligation flow：Longitudinal reinforcement → installation abdomen at stirrup → installation web moulding bed at installation horseshoe
Longitudinal reinforcement → installation web lacing wire → bellows on the outside of lengthways main steel bar → installation web moulding bed at plate stirrup → installation horseshoe →
Anchorage → examination → model sheetinstallat is installed.
Bottom, web reinforcement skeleton position overall binding using mold, and cutting and welding locating support are consolidated on mold angle steel
Determine the position of cage bar.
Cover to reinforcement with beam body with the core-theaded type concrete pad of label using being controlled, and cushion block is through on horizontal bar
Can freely activity, it is to avoid shifted during installation by the extruding of template or crooked cause protective layer thickness not enough.
Bellows is installed
(1) the longitudinally disposed 3 metal bellowss of the positive bending moment of T beams make prestressed pore passage, longitudinally disposed 4 metals of negative bending moment
Flat bellows processed make prestress pipe, and bellows is installed in strict accordance with layout design specification.
(2) the reinforcing bar positioning net of fixed bellows, sets " well " shape by every 100cm in length of pipeline direction or so and positions steel
Muscle, curved section often arranges a piece of away from 50cm.Positioning mesh should be greater than outer diameter tube 10mm, to ensure bellows up and down not
Larger skew is produced, positioning net should be fixed with the cage bar spot welding of beam body, not allow to be positioned with iron wire colligation, during casting concrete,
, can piece reinforcing bar of colligation at the top of bellows to prevent bellows from floating.
(3) bellows should be straight installed in straightway, should be by layout design curvilinear circular along without bending in curved section.
(4) anchor plate position, size requirement are correct, and anchor plate must be vertical with prestress pipe.
(5) bellows is penetrated after tie with reinforcing bar is good, and wears plastic tube as lining core, a diameter of 87mm of bellows,
Internal diameter is used symmetrically to be penetrated for 60mm plastic tubes two ends.
The spreading of bellows can be using bigger homotype bellows as junction block, and the length of junction block is 300mm, joint
Pipe two ends are encapsulated with sealant tape, cell end portion bellows and pre-buried anchor plate joint, bellows should be extended into anchor plate
10cm or so in hole, then encapsulated with sealant tape, to prevent seam crossing spillage, anchor plate must be vertical with pipeline.
Model sheetinstallat
Template is the bulk sizing punching block that specialized factory processes according to design drawing, and template thickness is δ=6mm steel plate,
Brace is put more energy into abdomen, using [10, increase template integral rigidity.Template first should try assembled to behind scene on empty base, check each portion
Position dimensional discrepancy, reaches that required precision can come into operation.Precast T-Beam bed die and precast pedestal are integral, using length
31.5m, wide 49.5cm, 3mm thick elongated steel plate, the angle steel of steel plate and 4 × 4cm of both sides on pedestal is welded into entirety.
(1) punching block should be cleared up before installing, derusts, clean dirt, the work such as coating release agent.Forbid to fall into after model sheetinstallat miscellaneous
Thing.
(2) after punching block correction, the adhesive tape of all splicing seams is gone through, whether bolt tightness, voussoir is urgent etc..Mould
Plate piece ensures that template face is smooth using patch two-sided tape sealing.
(3) bearing pre-embedded steel slab should be closely connected with bed die, invests the various built-in fittings of beam body and should simultaneously be installed with template, must not
Omit.
(4) Precast T-Beam side form is punching block, and template piecemeal, which is arranged at diaphragm plate, to connect, and side form bottom is worn with Screw arbor with nut at both-ends
Cross pedestal preformed hole to be fixed, side form is adjusted fixed with split bolt on wing plate top and does inner support with steel pipe.
(5) the strict position for controlling diaphragm plate, excessive influence lateral connection of guarding against deviations during model sheetinstallat.
(6) after template is adjusted, cross dimensions must ensure compliance with code requirement.
(7) locking plug template must be done toothing by design drawing requirement, and ensure that steel tendon is vertical with anchor plate when mounted.
Anchor plate is fixed on locking plug template with 4 positioning screws.
(8) to prevent template spillage, the pre-buried channel bar in both sides under steel plate at the top of pedestal fills in 5cm hard in channel bar
Sebific duct, sebific duct exposed 1/3 compresses ebonite pipe when installing side form and is close to pedestal, then ebonite pipe plays sealed effect.
(9) it after the completion of model sheetinstallat, should as early as possible pour, can not such as pour in time, cover to prevent from drenching with rain using colour bar cloth
Cause steel bar corrosion or dust to pollute template, influence Surface Quality of Concrete.
T beam wing plate reinforcing bar colligations
(1) T beams wing plate reinforcing bar colligation flow：The longitudinal bottom cage bar → installation wing plate lateral tie → installation wing of wing plate is installed
Plate longitudinal direction top layer cage bar → examination.
Wing plate reinforcing bar is positioned using combed plate, and termination and lateral connection reinforcing bar are using the side that standard hole is reserved on external mold
Method is positioned, and is accurately positioned embedded ribs.
During reinforcing bar colligation, the lap of splice is overlapped by code requirement, as shown in the table.Stagger by the joint of tunneling boring 50%, phase
The wrong head of adjacent reinforcing bar is more than 1.3 times of the lap of splice.
(2) reinforcing bar colligation should observe following regulation：
1. splice arrangement should meet job specfication requirement；
2. pre-buried beam-ends expansion joint, supporting grid, pre-embedded steel slab and anticollision barrier embedded ribs are noted；
3. main reinforcement protective layer thickness is controlled in strict accordance with the cover to reinforcement of layout design；
4. when steel-bar and stress technique muscle is collided, reinforcement location can make the appropriate adjustments；
5. when steel-bar and stress technique muscle is collided, regular reinforcement can temporarily be bent, after end to be tensioned, recover former during sealing off and covering anchorage again
Sample；
6. stirrup should be vertical with vertical muscle, and should be placed at crotch overlapping above web and interlaced arrangement；
7. the crosspoint of reinforcing bar is firm with iron wire colligation；Reinforcing bar is using being welded to connect, and fusion length welding by both sides is 5d, one side
10d is welded, d is bar diameter.
8. bellows spacer bar and fixation should be laid by design attitude while tie with reinforcing bar；
9. it should be hung between template and reinforcing bar by plum blossom-shaped and tie up concrete pad, to ensure protective layer thickness.
The reinforcement installation quality requirement table of table 1
(3) built-in fitting
Installation of embedded parts is synchronously carried out with reinforcing bar colligation and model sheetinstallat, and built-in fitting positions and dimensions are accurately to ensure
The key of T amount quality, therefore, installation of embedded parts must be carefully and careful.Built-in fitting includes preformed hole, bearing built-in fitting (side
Across), preformed hole (side bar), expansion joint built-in fitting, the positive pre-buried corrugated pipe pipeline of hogging moment beam, sealing off and covering anchorage or wet seam reserved steel bar
Deng.
Various model built-in fittings or reserving rib should be installed by design requirement processing and fabricating and according to reinforcing bar colligation situation,
The erection sequence of each built-in fitting, embedded ribs is should be noted that during construction, and ensures that position is accurate.
Concrete construction
(1) template inspection and reinforcing
After the completion of wing plate reinforcing bar colligation, before casting concrete, template need to be reinforced, the split bolt by above and below
Tighten, check whether template consolidates, it is linearly whether straight, only after template passed examination, it can just carry out concrete construction.
(2) beam body concrete mixing requirement：
1. Concrete Design rank is C50.
2. high-efficiency high-quality water reducer is used, concrete workability and early strength is improved.
3. the slump of strict control concrete is within the scope of the 120mm~140mm reported to a higher authorities for approval.
4. aggregate control is strengthened, the clay content of close inspection aggregate when aggregate is marched into the arena, it is ensured that reach quality requirement is unqualified
Aggregate does not allow to use without exception.
5. during concrete batching mixture, cement, the consumption of additive should be accurate to ± 1%, and the consumption of thick, fine aggregate should
± 2% (being by weight) is accurate to, used weighing weighing apparatus should inspect periodically correction.
(3) concreting is with vibrating：
Beam body concrete should be poured using horizontal slice, oblique zonal cooling, come and gone and poured from T beams one end to the other end.
Lift height is 30cm, oblique 10~15m of segmentation.Underplate concrete is first poured, then pours web, diaphragm plate and top plate successively and is mixed
Solidifying soil.Successively two layers of interval time tries one's best shortening, prevents cold seam occur because the stand-by period is long.Pouring the nearly other end
When, to avoid beam-ends concrete from producing the leakiness phenomenons such as honeycomb, change from one end and feed intake round about, away from 4~5m of the end
Place's closure.It is layered blanking, vibrates, per thickness degree no more than 30cm, upper layer concrete must be in lower-layer concrete vibration compacting
After can pour, to ensure that concrete has good density.The horseshoe part reinforcing bar of prestressed concrete beam is closeer, to ensure
Quality, can first pour horseshoe part, after pour web.The concrete of its diaphragm plate is poured simultaneously with web, should be layered when pouring, and is put down
Row operation.
Concrete uniform, continuous should be spread out and pour into downwards, and the side shake of respective section, adhesion type vibration are started after each blanking
Device is arranged symmetrically by 2.0 meters of one of both sides, and a row is arranged on shape of a hoof inclined-plane, and second row is arranged in web center, with
One row's arranged for interval.The time that the shake of every section of side shakes every time is unsuitable long, generally 20s~30s to avoid concrete disintegration, and
Inside is vibrated with the plug-in type vibrators of Φ 30, carried out when vibrating using the method for " fast insert is pulled out slowly ".Concreting is arrived
During panel, vibrator is no longer started.The people of form vibrator attached vibrator arrangement two is responsible for specially, and a people is responsible for side
Open and close, fill that what position shakes what position, forbid sky to shake template, and form vibrator and side form vibrating grid are closely connected, to mix
Solidifying soil absorbs vibration force to greatest extent, and time of vibration stops sinking with concrete, effervescent, bleeding, surface be not flat for degree.
Attached vibrator is relied primarily on below T beam horseshoes to vibrate, web top, wing plate concrete rely primarily on plug-in type
Vibrator vibrates, during beam body filling concrete, specifies special messenger to check template, reinforcing bar, finds bolt and chock, support etc.
Loosening should tighten and beat in time jail.It was found that spillage should be blocked up sternly in time, reinforcing bar and built-in fitting such as change displacement adjustment guarantee in time
Position is correct.
Concrete local stress is larger under anchor plate, it should be specifically noted that being vibrated to concrete under anchor plate.Such as reinforcing bar point
Cloth is closeer to be vibrated using the vibrating spears of φ 30.
Back concrete should it is closely knit, smooth, except strengthening that in addition to surface vibrates, after concrete water bleeding, pressure should be also caught up with for the second time
Floating, concrete exposed surface should carry out plucking after receiving slurry.
After form removable, when concrete strength reaches 10MPa, in time using handheld pneumatic dabbing machine to beam end,
Surface carries out dabbing at diaphragm plate, flange plate.Dabbing depth preferably controls in 3~5mm or exposes coarse aggregate and be defined.Controlled during dabbing
Concrete outer ledge reserves 20~30mm scope not dabbing.
Concrete curing
Beam body concrete curing plays a decisive role to structure later strength grade, after form removal must in strict accordance with specification and
Design requirement carries out beam body maintenance work, and summer is using covering geotechnique at the top of flange plate bottom and web spray clean water, wing plate
Cloth watering moisture-keeping maintaining, diligent sprinkles water, and local blind area takes artificial benefit to spill, and remains that beam body is in moisture state.
Precast beam concrete needs continuous health 7 days, even if intensity reaches tensioning requirement, also needs to meet health requirement.
Prestress wire is constructed
(1) steel wire
Steel strand wires should meet GB/T5224-2003 regulation using underrelaxation high-strength prestress steel strand wires.Single steel is twisted
Linear diameter φ s=15.2mm, steel strand wires area A=140mm, steel strand wires normal intensity fpk=1860Mpa, elastic modulus Ep=
1.95×105Mpa, control stress for prestressing σcon=0.75fpk, sub-thread control stress for prestressing P=193.9KN.Steel strand wires reach existing
After, whether correct complete, then check presentation quality, i.e. steel if first checking for product certificate, packing method and logo content
Twisted wire surface whether corrosion, whether greasy dirt influence cohesive force with concrete etc..
The principle for very much not taking small and reserved end protruded length according to taking, the blanking of standard span 30m prestress wires
Length is uniformly：30.7m, steel wire length is used in hogging moment tensioning：18.1m.
The cutting of steel strand wires uses abrasive wheel cutting machine, is tied immediately after cutting, in case steel strand wires are loose.It is unnecessary to prevent
Waste of material, will be cut in strict accordance with computational length.
(2) steel stranded wire penetrating adapter
After the completion of steel wire, steel stranded wire penetrating adapter is carried out, lashing uses artificial lashing.Stretching end is must be noted that during lashing
The steel strand wires active length stayed, precast beam girder tensioning active length is 60cm, and hogging moment tensioning active length is 50cm.
Prestressed stretch-draw
(1) prestressed stretch-draw requirement
1. when the intensity of precast beam concrete reaches the 90% of design strength grade point, and modulus of elasticity reaches concrete
The 85% of 28d modulus of elasticity, can stretch-draw prestressing force steel beam.Steel beam tension sequence is：50%N2 → 100%N3 → 100%N2
→ 100%N1.Two ends are symmetrical during steel Shu Zhangla, uniform tensioning, using stretching force and the amount of extending dual control.
2. prestressed stretch-draw is critical process, it is necessary to be responsible for by special messenger, special operation team.Apply before prestressing force, it is necessary to
Complete the work such as the inspection of anchorage fixture, tensioning equipment inspection and report management to agree to, while performing station system by stretching process management.
3. before prestressed stretch-draw, first carry out jack and manometric verification oil pressure meter reading corresponding with tension tonnage and
The calculating of steel wire elongation, is especially checked jack and oil pump comprehensively, it is ensured that each several part is oil-proof and can normal work.
4. after the completion of a branch of prestress wire tensioning, its fracture of wire, stripped thread situation should be checked.Generally, Yi Shugang
Twisted wire fracture of wire or stripped thread control number are no more than 1.When such as exceeding control number, steel strand wires should be changed in principle and are laid equal stress on new tensioning.
5. strain-pull controlling of prestress power reaches after stabilization that the unnecessary steel strand wires in termination are cut using abrasive machine cold cut, reserves 3cm,
Forbid to be cut with arc welding, anchoring closing immediately after steel strand wires cutting.
(2) anchorage installation
1. prestressed anchor is strict with, it is necessary to have product certificate bright, and carry out censorship experiment, through pass the test
Rear can be used.
2. anchorage and the mortar of anchor plate contact position are removed, to ensure that anchorage and anchor plate contact surface are smooth, uniform force,
Then anchorage can be just installed.The each intermediate plate of close inspection is answered to have free from flaw or tooth line to damage phenomenon during upper clip, it is defective
Intermediate plate is forbidden to use.
3. two intermediate plates are uniformly squeezed into anchor ring by intermediate plate application split ring handle simultaneously, are in two intermediate plate outer faces same flat
In face, the two intermediate plate discrepancy in elevation should be taken out more than 2 millimeters of persons and reinstall.
Mud jacking and sealing off and covering anchorage
(1) hole path pressure grouting is critical process, it is necessary to be responsible for by special messenger, special operation team.Duct must be completed before mud jacking
The work such as borehole cleaning, mud jacking equipment inspection simultaneously report management to agree to, while performing station system by the management of mud jacking process.
(2) after tension of prestressed tendon anchoring, duct should mud jacking, and should being completed in 48h as early as possible.
(3) slurries prepared using Special grouting material or Special grouting agent carry out hole path pressure grouting, according to description of product book label
The index accurate formulation mud jacking slurries such as ratio of mud of note, the weighing precision of various materials is controlled within ± 1%.
(4) temperature of mud jacking slurries is no more than 25 DEG C.When day temperature is higher than 35 DEG C, it is low that mud jacking should be arranged in night
The warm period is carried out；When temperature is less than 5 DEG C in 2 days after mud jacking process and mud jacking, forbid mud jacking operation under without reliable Insulation.
(5) each mud jacking work operations class, which should make, leaves and takes 3 groups of test specimens, and standard curing 28d carries out compression strength and anti-folding
Strength test, is used as the foundation of performance rating.
(6) after each mud jacking work operations class terminates, it is necessary to mud jacking equipment is cleared up in time.
(7) after the completion of mud jacking, beam-ends slurries should be cleaned out in time, at the same remove bearing plate, anchorage surface it is mixed
Solidifying soil dirt, and closed protective is carried out to anchored end by design requirement.Sealing off and covering anchorage concrete should be plugged and pounded carefully, and be conserved by regulation.
Long-term exposed anchorage, it is necessary to take rust preventing.
Claims (10)
1. a kind of T beam manufacture methods for reducing blibbing, it is characterised in that：Comprise the following steps：
The beam prefabricated frame structure construction of A, T；
B, installation wall-attachment vibrator：One group of high frequency wall-attachment vibrator is installed in the horseshoe position of the beam prefabricated frame structures of T,
The middle part of the web of the beam prefabricated frame structures of T is installed by one group of low frequency wall-attachment vibrator；Adjacent high frequency wall-attachment vibrator
Spacing is 1.2-1.8 meters, and the spacing of adjacent low frequency wall-attachment vibrator is 1.2-1.8 meters；
C, concreting：Comprise the following steps：
C1, pour the first layer concrete：Control concreting to the horseshoe position of the beam prefabricated frame structures of T, then high frequency is attached
Wall type vibrator is vibrated, while carrying out human assistance by poker vibrator；
C2, pour the second layer concrete：Concreting is controlled to the centre position of the web of the beam prefabricated frame structures of T, then
Low frequency wall-attachment vibrator is vibrated, while carrying out human assistance by poker vibrator；
C3, pour third layer concrete：Web and wing plate boundary position of the concreting to the beam prefabricated frame structures of T are controlled,
Then vibrated by poker vibrator；
C4, pour the 4th layer concrete：Control concrete is poured on the outside of the wing plate of the beam prefabricated frame structures of T to inner side, then
Vibrated by poker vibrator；
D, form removal, and carry out dabbing processing；
E, concrete curing.
2. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：The step c1
In high frequency wall-attachment vibrator the frequency 175-185HZ that vibrates, vibrating time is 18-20s；Low frequency in the step c2 is attached
The frequency 48-52HZ that vibrates of wall type vibrator, vibrating time is 20-22s.
3. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：In the step C
The thickness of the first layer concrete be 400-500mm, the thickness of the second layer concrete is 500-600mm, third layer concrete
Thickness is 500-600mm, and the thickness of the 4th layer concrete is 300-400mm.
4. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：The step c1
In high frequency wall-attachment vibrator open opportunity be concreting to the beam prefabricated frame structures of T horseshoe position when；It is described
The unlatching opportunity of low frequency wall-attachment vibrator in step c2 be concreting to web centre position when.
5. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：The concrete
Concrete include quality between water, mud, sand, rubble, flyash and additive, and water, mud, sand, rubble, flyash and additive
Than for 152：416：709：1064：74：4.9；A diameter of 5-31.5mm of the flyash；Described additive is that polycarboxylic acids is high
Performance water reducer.
6. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：The concrete
Slump control in the range of 190-205mm.
7. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：In the step C
Poker vibrator be vibrating head, vibrating head sinks to concrete naturally, and slotting spacing of the vibrating head is effective for vibrating head
1.2-1.5 times of operating radius, the close time of shaking of each vibrating head for inserting point for 20-30s, shake close operation when by above and below vibrating head
5-10cm is twitched, the depth of vibrating head barred body insertion concrete is the 2/3-3/4 of vibrating head barred body length.
8. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：In the step A
The beam prefabricated frame structure construction steps of T are followed successively by stirrup at installation horseshoe, longitudinal reinforcement, web hooping, horseshoe at web moulding bed
Longitudinal reinforcement, web lacing wire on the outside of place's lengthways main steel bar, web moulding bed, then carry out bellows installation, anchorage installation and template peace
Dress；After described model sheetinstallat releasing agent is coated in template surface.
9. a kind of T beam manufacture methods for reducing blibbing according to claim 8, it is characterised in that：The described demoulding
Agent includes machine oil and diesel oil, and machine oil and diesel oil press 3：7 volume ratio configuration.
10. a kind of T beam manufacture methods for reducing blibbing according to claim 1, it is characterised in that：The step D
The dabbing of middle progress is processed as when concrete strength reaches 10MPa, using handheld pneumatic dabbing machine to beam end, tabula
Surface carries out dabbing at plate, flange plate；Described dabbing is deep-controlled to control concrete outer ledge pre- in 3-5mm, dabbing
20-30mm scope is stayed to be handled without dabbing.
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| CN108425320A (en) * | 2018-05-23 | 2018-08-21 | 中铁北京工程局集团城市轨道交通工程有限公司 | A kind of removing method of bridge deck protecting wall blibbing |
| CN108544655A (en) * | 2018-04-10 | 2018-09-18 | 安徽宝翔建设集团有限责任公司 | The curved beam prefabricated construction method of curved bridge |
| CN108609955A (en) * | 2018-05-21 | 2018-10-02 | 云南建投绿色高性能混凝土股份有限公司 | T-type beam concrete and its construction method |
| CN109356161A (en) * | 2018-11-23 | 2019-02-19 | 中国水利水电第七工程局有限公司 | A kind of large size water power well bend loss low-speed high frequency inclined plane delamination concreting method |
| CN112982414A (en) * | 2020-01-13 | 2021-06-18 | 史新颜 | Can break hydraulic engineering construction of bubble in concrete with pouring equipment |
| CN113482351A (en) * | 2021-06-25 | 2021-10-08 | 中铁十九局集团有限公司 | Construction method for T-beam concrete pouring |
| CN117536363A (en) * | 2024-01-10 | 2024-02-09 | 内蒙古电力（集团）有限责任公司内蒙古电力经济技术研究院分公司 | Energy-saving heat-preserving building wall structure and construction method thereof |
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| CN109356161A (en) * | 2018-11-23 | 2019-02-19 | 中国水利水电第七工程局有限公司 | A kind of large size water power well bend loss low-speed high frequency inclined plane delamination concreting method |
| CN112982414A (en) * | 2020-01-13 | 2021-06-18 | 史新颜 | Can break hydraulic engineering construction of bubble in concrete with pouring equipment |
| CN113482351A (en) * | 2021-06-25 | 2021-10-08 | 中铁十九局集团有限公司 | Construction method for T-beam concrete pouring |
| CN117536363A (en) * | 2024-01-10 | 2024-02-09 | 内蒙古电力（集团）有限责任公司内蒙古电力经济技术研究院分公司 | Energy-saving heat-preserving building wall structure and construction method thereof |
| CN117536363B (en) * | 2024-01-10 | 2024-03-26 | 内蒙古电力（集团）有限责任公司内蒙古电力经济技术研究院分公司 | Energy-saving heat-preserving building wall structure and construction method thereof |
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