CN101748681B - Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam - Google Patents
Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam Download PDFInfo
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Abstract
The invention discloses a pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beams, belonging to the technical field of bridge building constructions. The construction technology comprises the following steps of: foundation treatment; the design and fabrication of footstalls; the design and fabrication of reaction beams; the design and fabrication of tension beams; the design and fabrication of uplift piles; the fabrication and pre-embedment of a bent-up device; the design and fabrication of stranded steel wire tension connectors; the processing and colligation of reinforcing steel bars; the blanking and strand pricking of stranded steel wires; the tensioning of pre-stressed tendons; the fabrication and installation of templates; the pouring and maintenance of concrete; the relaxation of the pre-stressed tendons; and the pit-out and installation of T-shaped beams. The invention can solve various difficult problems in the prestress tensioning construction of high-span broken line reinforced concrete T-shaped beams and fills the gap of the technology of China, and the whole construction technology process and relevant control parameters has scientific and reasonable configuration, can meet the requirements of design and construction on quality, safety and the like, and have high operational instruction property. The invention can be widely applied to the stranded steel wire tensioning construction in structures similar to the high-span broken line pretensioning method T-shaped beams, the box girder and the like in engineering of large-scale buildings, bridges, wharfs and the like.
Description
Technical field
The invention belongs to the technical field of bridge construction construction, be specifically related to a kind of 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology.
Background technology
The 1950's, the proud achievement and the grand engineering of Bridges in Our Country technology were dazzling to the seventies, but the rapid progress of a science depends on economical full recovery and development.Reform and opening-up has really started the development of China's communication, speedway begins newly-built, raising along with road quality classification, bridge, particularly many technical indicators such as the load standard of arterial highway bridge, bridge width, bridge clearance, designed flood frequency all promote comprehensively, and prestressing technique is extensively used.Along with the continuous development of basic transport developments such as highway, railway, some are subjected to the area of geographical conditions restrictions, current and from now on the part traffic engineering need adopt Longspan Bridge, to solve practical problem.Simultaneously and since the prestressed concrete tube prop up the T beam have cost low, be convenient to advantages such as batch production production, duration is short, be one of main pattern of large bridge construction.At present, prop up the design of T beam and bring into use broken-line reinforcement structure (rationally stressed) striding footpath prestressed concrete tube greatly, but because that broken line pre-tensioning system large span prestressed concrete T beam has a structural span is big, it is many and concentrate to join bundle in the beam body, characteristics such as tension stress during stretch-draw, stretch-drawing beam stress, reaction beam stress are big, the practice of construction difficulty is very big, and domestic still do not have a complete construction technology process.
Summary of the invention
At problems of the prior art, the object of the present invention is to provide a kind of construction technology of 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system, fill up the blank of this technology, be widely used in infrastructure facility fields such as highway, railway, urban interchange, water conservancy.
Described 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology is characterized in that comprising following processing step:
1) ground is handled: the layout that comprises prefabricated place, arrangement requirement according to precasting yard, at the pedestal zone line, according to the load of producing the T beam, original ground is carried out foundation handles, at the pedestal two ends since prestressing force put after the two ends that cause of T beam arch camber concentrated stressed, need the basis of pedestal end is handled, guarantee that pedestal is not damaged after the T beam is put an arch camber; Simultaneously, the operating condition of reasonable Arrangement material, equipment transport routes, construction water, electricity consumption, an internal drainage;
2) pedestal design, making: the beam prefabricated bed die of T adopts fixed concrete foundation steel bed die, it is precast pedestal, the pedestal base is provided with antiarch by designing requirement, locate with angle steel earlier by T beam bottom width, it is fixing to adjust the back by the antiarch requirement, angle steel and pedestal adopt embedded bar to be connected and fixed, checking correct back adopts the C30 concrete to build, simultaneously in time levelling is carried out on the surface, be convenient to lay the steel plate bed die, pedestal lower face 8cm place buries the pvc pipe of Φ 25 internal diameters underground by each meter spacing, is used for wearing of steel form standing screw;
3) reaction beam design, making: respectively establish a length in the pedestal both sides and reach 51m, section is the steel bar concrete reaction beam of 900mm * 500mm, and spacing is 4～4.5m;
4) stretch-drawing beam design, make: adopt gooseneck form of structure, during designing and calculating, should consider to calculate the integral rigidity of stretch-drawing beam emphatically, can amount of deflection reach the requirement of tension stress, simultaneously, because presstressed reinforcing steel is more concentrated, spacing up and down has only 5cm, for the gooseneck after the perforate of lashing position, useful area falls sharply, must carry out the designing and calculating of local stiffness and strain, guarantee that the rigidity of this local location can satisfy the requirement of tensioning construction, stretch-drawing beam must be installed on the fixed support, the integral level lateral sliding of gooseneck when being convenient to integral tension;
5) the anti-design and construction of dialling stake: anti-group of stake is located at the broken line steel hinge line and bends up a below, and be by bending up apparatus and guide strip, accurate at the fixed position that bends up a little to guarantee steel hinge line; Anti-stake employing drilled pile or the steel concrete gravity abutment dialled resists and dials safety factor more than 1.5 times, and an anti-pre-buried 10mm steel plate in top of dialling is convenient to installation and is bent up device; Steel plate adopts Φ 20 screw-thread steels to be connected with pile body master muscle, by calculating the quantity of determining screw-thread steel, prevent that built-in fitting from being transferred to when tension of prestressed tendon, tear open and constructing operation, an anti-working pit of locating to be provided with 1.5m * 1.0m * 1.0m of dialling for the ease of the peace of drag unit;
6) bend up the making of device and pre-buried: bend up device and form by rotating steel shaft base, pin, deflecting plate, guide strip, bending up apparatus is made up of two parts, comprise that the disposable use part of imbedding the beam body is connected the reusable part of usefulness with beam body below, disposable use partly comprises deflecting plate, guide strip, reuse part and comprise rotating steel shaft base, pin, guide strip and deflecting plate are combined into the cross steel work, bend up at steel strand built-in fitting a little is set, and bend up device and are connected with built-in fitting;
7) steel hinge line stretch-draw connector designs and produces: adopt fining twisted steel at the stretch-drawing beam position, the end is fixed with the spiral shell anchoring, and fining twisted steel then adopts special connector to be connected with steel hinge line;
8) reinforcing bar processing, colligation: reinforcing bar at atelier's unified allocation of materials to lower units, bend, number class stacks, and after blanking is finished, carries out merogenesis and makes, 9 meters at every joint connects into integral body after being placed to pedestal, carries out steel hinge line lashing, location then;
9) steel hinge line blanking and lashing: every beam all carries out accurate blanking, the construction of lashing in time after the blanking according to line beam, the calculated length that bends up the bundle steel hinge line;
10) tension of prestressed tendon: stressing sequence is 0 → 30% → 60% σ κ → 100% σ κ (holding lotus 2min anchoring), both sides symmetrical stretch-draw simultaneously, stretch-draw is divided into six stages: the phase I is stretched to 30% for bending up bundle, second stage is that line beam is stretched to 30%, phase III is that line beam is stretched to 60%, to be stretched to 60%, the five-stage be that line beam was stretched to for 100%, the six stage and is stretched to 100% for bending up to restraint to the quadravalence section in order to bend up bundle; From 0～60% stage employing single tendon stretch, adopt integral tension from 60%～100% side, adopt QYC270 type, YDC2500 type, YDC5000 type hydraulic jack during stretch-draw respectively, treat to adopt mechanic jacks to do temporary fixed behind the integral tension to 100%;
11) template construct and installation: adopt the typing punching block, vertically single-unit length is 6m, panel adopts δ 10 steel plates, angle steel with ∠ 63 * 40 constitutes stiffening frame, to guarantee that intensity, rigidity and planeness satisfy job specfication, designing requirement, adjacent two templates adopt wedge shape to take mouth, and split bolt connects, Side Template can break away from after putting, must separate independent moulding with side form;
12) concrete build, maintenance: the beam body adopts placement layer by layer, layer thickness control is at 30～40cm, in the presstressed reinforcing steel zone, adopt single attached vibrator vibration compacting, for the outer zone of presstressed reinforcing steel, the method vibration compacting that then adopts poker vibrator and attached type vibrator to combine, promptly begin maintenance after the final set of beam body concrete, adopt during maintenance and cover the mode that nonwoven waters, between curing time, the beam surface must keep moisture state;
13) presstressed reinforcing steel is put and opened: presstressed reinforcing steel is put a palpus by designing requirement, beam body concrete strength reaches more than 90%, every Pin beam is put the concrete strength of opening and is wanted basically identical, in time pressure testing being carried out in test block by test room determines, and intensity is unsuitable excessive, prevent the T beam after putting to play the camber error excessive, before presstressed reinforcing steel integral body is put, must adopt device for bending up to discharge the following tensile stress that bends up a little earlier, adopt the YDC2500 type then, YDC5000 type hydraulic jack is to line beam and bend up Shu Jinhang integral body and put and open, put the Zhang Caiyong classification and put and open, about a process of putting must be accomplished, two ends symmetries with carry out synchronously;
14) the T beam goes out the hole, installs: adopt straddle truck to lift out hole and installation.
Described 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology, it is characterized in that the pedestal middle part processing method described in the step 1) is: adopt rubble pool slag to fill earlier, after rolling compacting, the thick C30 concrete of cast 25cm bed course is built pedestal then thereon; Described pedestal two ends processing method is: because of the T beam through tensioning construction, arch upward in beam body middle part, the quality of whole beam body is shifted to being supported on the point load at two ends gradually by evenly distributed load, 50mT beam one end point load reaches 870KN, therefore adopt the C30 concrete to enlarge the basis in the beam-ends bottom, key dimension is 2.2 * 2 * 0.6m and is 20mm at concrete subfoundation configuration diameter that spacing is the steel mesh reinforcement of 20 * 20cm, with reinforcement globality and stressed needs, center base is thick 20cmC30 concrete.
Described 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology, it is characterized in that described pedestal base is provided with antiarch by designing requirement, beam pushes up at span centre, and central sill is established the camber of downward 4cm, side bar is established the camber of downward 4.5cm, and inverted camber is pressed second-degree parabola and changed.
Described 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology, it is characterized in that described employing gooseneck form of structure, upper and lower crossbeam adopts thick 40mm assembly welding to form, steel Q345 steel, welding rod adopts the E50 type, the cross section is 1200mm * 600mm, by steel hinge line cloth beam request top rail stand up, lower transverse beam keeps flat.
Described 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology, it is characterized in that the described Zhang Caiyong of putting classification is put opens, be divided into four-stage: the phase I opens to 60% σ κ for bending up to restraint to put, second stage is that line beam is put and opened to 60% σ κ, phase III puts and opens to zero for bending up bundle, and the quadravalence section is that line beam is put and opened to zero.
The present invention can solve many difficult problems in the large span broken-line reinforcement concrete T-shaped beam tensioning construction, fill up the blank of domestic this technology, the setting science of a whole set of construction technology process and relevant controlling parameter, reasonable can satisfy design and construction to requirements such as quality, safety, and Operating Guideline is strong.This technology is calculated the design of pedestal, reaction beam, the stretch-drawing beam science of carrying out, associated components (member) processing, skilfully manufactured, stretch-draw and put Zhang Chengxu advanced person, rationally, arrangement of reinforcement accurate positioning in the beam body, good between concrete and the presstressed reinforcing steel from the anchor bond effect, girder stability can be high, is fit to batch production and makes, process; Can be widely used in the engineerings such as building, bridge, harbour steel hinge line stretching construction in the structures such as similar large span broken line pre-tensioning system T beam, case beam, have a extensive future.
Description of drawings
Fig. 1 is a construction flow chart of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
At first carrying out ground handles, the layout that comprises prefabricated place, arrangement requirement according to precasting yard, at the pedestal zone line,, original ground is carried out foundation handle according to the load of producing the T beam, at the pedestal two ends, owing to prestressing force put after the two ends that cause of T beam arch camber concentrate stressedly, need handle to the basis of pedestal end, guarantee that pedestal is not damaged after the T beam is put an arch camber; Simultaneously, operating conditions such as reasonable Arrangement material, equipment transport routes, construction water, electricity consumption, an internal drainage.Pedestal middle part processing method is: adopt rubble pool slag to fill earlier, after rolling compacting, the thick C30 concrete of cast 25cm bed course is built pedestal then thereon; Described pedestal two ends processing method is: because of the T beam through tensioning construction, arch upward in beam body middle part, the quality of whole beam body is shifted to being supported on the point load at two ends gradually by evenly distributed load, 50mT beam one end point load reaches 870KN, therefore adopt the C30 concrete to enlarge the basis in the beam-ends bottom, key dimension is 2.2 * 2 * 0.6m and is 20mm at concrete subfoundation configuration diameter that spacing is 20 * 20cm steel mesh reinforcement, with reinforcement globality and stressed needs, center base is thick 20cmC30 concrete.
Carry out the pedestal design then, make.The beam prefabricated bed die of T adopts fixed concrete foundation steel bed die, it is precast pedestal, for preventing the arch camber superelevation, change structure, the pedestal base is reserved by designing requirement antiarch is set, and beam pushes up at span centre, and central sill is established the camber of downward 4cm, side bar is established the camber of downward 4.5cm, and inverted camber is pressed second-degree parabola and changed.Locate with angle steel earlier by T beam bottom width, it is fixing to adjust the back by the antiarch requirement, angle steel and pedestal adopt embedded bar to be connected and fixed, checking correct back adopts the C30 concrete to build, simultaneously in time levelling is carried out on the surface, be convenient to lay 10mm steel plate bed die, pedestal lower face 8cm place, bury the pvc pipe of Φ 25 internal diameters underground by each meter spacing, be used for wearing of steel form standing screw.Go out hole, lifting for the ease of the T beam, through designing hole for hoist is set with being intended to beam-ends 1.2～1.4m place, therefore when pedestal designs, reserve hole for hoist in this position, bed die has adopted sliding block herein, with the pedestal unitary release, when building, lays on the T beam, fall after putting that remove can tying up dress wire rope during lifting.
The reaction beam design, make: respectively establish a length in the pedestal both sides and reach 51m, section is the steel bar concrete reaction beam of 900mm * 500mm, the end is extended to 2700mm * 700mm according to the T depth of beam, spacing is 4～4.5m, spacing is determined according to beam upper limb width and shuttering work face, reaction beam is in whole stretch-draw system, belong to the pressure-bearing rod member, slenderness ratio is very big, in order to reach the pressure-bearing effect and the strut stability of reaction beam, by every about 6 meters crossbeam is set one, totally nine roads, the crossbeam end face is 500mm * 300mm, two road reaction beams form integral body about making, reaction beam and binder army adopt the C50 concrete, and configuration principal rod and distributing bar.
Stretch-drawing beam design, make: adopt gooseneck form of structure, upper and lower crossbeam adopts thick 40mm assembly welding to form, steel Q345 steel, welding rod employing E50 type, the cross section is 1200mm * 600mm, by steel hinge line cloth beam request top rail stand up, lower transverse beam keeps flat.During designing and calculating, should consider to calculate the integral rigidity of stretch-drawing beam, the requirement that can amount of deflection reach tension stress emphatically, simultaneously, because presstressed reinforcing steel is more concentrated, spacing up and down has only 5cm, for the gooseneck after the perforate of lashing position, useful area falls sharply, must carry out the designing and calculating of local stiffness and strain, guarantee that the rigidity of this local location can satisfy the requirement of tensioning construction, stretch-drawing beam must be installed on the fixed support, the integral level lateral sliding of gooseneck when being convenient to integral tension.
The anti-design and construction of dialling stake: anti-group of stake is located at the broken line steel hinge line and bends up a below, and be by bending up apparatus and guide strip, accurate at the fixed position that bends up a little to guarantee steel hinge line; Anti-stake employing drilled pile or the steel concrete gravity abutment dialled resists and dials safety factor more than 1.5 times, and an anti-pre-buried 10mm steel plate in top of dialling is convenient to installation and is bent up device; Steel plate adopts Φ 20 screw-thread steels to be connected with pile body master muscle, by calculating the quantity of determining screw-thread steel, prevent that built-in fitting from being transferred to when tension of prestressed tendon, tear open and constructing operation, an anti-working pit of locating to be provided with 1.5m * 1.0m * 1.0m of dialling for the ease of the peace of drag unit.
Bend up the making of device and pre-buried: bend up device and form by rotating steel shaft base, pin, deflecting plate, guide strip, bending up apparatus is made up of two parts, comprise that the disposable use part of imbedding the beam body is connected the reusable part of usefulness with beam body below, disposable use partly comprises deflecting plate, guide strip, reuse part and comprise rotating steel shaft base, pin, guide strip and deflecting plate are combined into the cross steel work, make structure safer, bend up at steel strand built-in fitting a little is set, bend up device and be connected with built-in fitting.
Steel hinge line stretch-draw connector designs and produces: adopt fining twisted steel at the stretch-drawing beam position, the end is fixed with the spiral shell anchoring, and fining twisted steel then adopts special connector to be connected with steel hinge line.
Reinforcing bar processing, colligation: reinforcing bar at atelier's unified allocation of materials to lower units, bend, number class stacks, and after blanking is finished, carries out merogenesis and makes, 9 meters at every joint connects into integral body after being placed to pedestal, carries out steel hinge line lashing, location then.
Steel hinge line blanking and lashing: every beam all carries out accurate blanking, the construction of lashing in time after the blanking according to line beam, the calculated length that bends up the bundle steel hinge line.
Tension of prestressed tendon: the tension sequence of pretensioned prestressing muscle is to go up afterwards earlier, and promptly the top bends up bundle earlier.Back lower place line beam, and prevent that steel strand from intersecting.Prestress wire is by designing and calculating, stretching force=1395Mpa * steel strand sectional area, and stretching force and design elongation carried out two controls.The pre-tensioning system stressing sequence is 0 → 30% → 60% σ κ → 100% σ κ (holding lotus 2min anchoring), both sides symmetrical stretch-draw simultaneously, stretch-draw is divided into six stages: the phase I is stretched to 30% for bending up bundle, second stage is that line beam is stretched to 30%, phase III is that line beam is stretched to 60%, to be stretched to 60%, the five-stage be that line beam was stretched to for 100%, the six stage and is stretched to 100% for bending up to restraint to the quadravalence section in order to bend up bundle; From 0～60% stage employing single tendon stretch, adopt integral tension from 60%～100% side, adopt QYC270 type, YDC2500 type, YDC5000 type hydraulic jack during stretch-draw respectively, treat to adopt mechanic jacks to do temporary fixed behind the integral tension to 100%.
Template construct and installation: adopt the typing punching block, vertically single-unit length is 6m, panel adopts δ 10 steel plates, angle steel with ∠ 63 * 40 constitutes stiffening frame, to guarantee that intensity, rigidity and planeness satisfy job specfication, designing requirement, adjacent two templates adopt wedge shape to take mouth, split bolt connects, can prevent spillage and eliminate adjacent forms overlapping the slot trace, make the T beam smooth surface of building attractive in appearance, Side Template can break away from after putting, therefore must separate independent moulding with side form, and each pedestal configuration one cover is special-purpose.Carrying out concrete after the template overlap joint finishes builds.
Concrete is built, maintenance: it is the concrete of C50 that the beam body adopts grade, adopt placement layer by layer, layer thickness control is at 30～40cm, in the presstressed reinforcing steel zone, because the cloth bundle is intensive, the presstressed reinforcing steel spacing has only 5cm, collide presstressed reinforcing steel for fear of the internal vibration rod, adopt single attached vibrator vibration compacting, for the outer zone of presstressed reinforcing steel, the method vibration compacting that then adopts poker vibrator and attached type vibrator to combine, promptly begin maintenance after the final set of beam body concrete, adopt during maintenance and cover the mode that nonwoven waters, between curing time, the beam surface must keep moisture state.
Presstressed reinforcing steel is put and opened: presstressed reinforcing steel is put a palpus by designing requirement, beam body concrete strength reaches more than 90%, every Pin beam is put the concrete strength of opening and is wanted basically identical, in time pressure testing being carried out in test block by test room determines, and intensity is unsuitable excessive, prevent the T beam after putting to play the camber error excessive, before presstressed reinforcing steel integral body is put, must adopt device for bending up to discharge the following tensile stress that bends up a little earlier, adopt the YDC2500 type then, YDC5000 type hydraulic jack is to line beam and bend up Shu Jinhang integral body and put and open, putting the Zhang Caiyong classification puts and opens, be divided into four-stage: the phase I opens to 60% σ κ for bending up to restraint to put, second stage is that line beam is put and opened to 60% σ κ, and the phase III puts and opens to zero for bending up bundle, and the quadravalence section is that line beam is put and opened to zero.Put a process must accomplish about, two ends symmetries with carry out synchronously.
The T beam goes out the hole, installs: adopt straddle truck to lift out hole and installation.The T beam goes out to deposit to be placed in behind the hole deposits Liang Chang, when depositing beam, props up pad with the lumps of wood in the bearing center, and the centre must be all unsettled, and in time set up after concrete reaches design strength fully, deposits the beam time to be no more than 30 days.
The advantage of this engineering method is as follows:
1, compare post-tensioned construction, this technology reaches the factorial construction operating condition, reduces the mud jacking operation, can save the materials such as pre-buried bellows, ground tackle simultaneously, can greatly shorten the duration of a project, reduce project cost, and economic benefit is very obvious.
2, compare post-tensioned construction, adopt this technology, better from the anchor bond effect in the beam body between concrete and the presstressed reinforcing steel, the arrangement of reinforcement more accurate positioning makes beam body stress system more reasonable, and structure is more stable.
3, greatly reduce the work high above the ground time, reduced the generation of security incident.
Claims (5)
1.50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology is characterized in that comprising following processing step:
1) ground is handled: the layout that comprises prefabricated place, arrangement requirement according to prefabricated place, at the pedestal zone line, according to the load of producing the T beam, original ground is carried out foundation handles, at the pedestal two ends since prestressing force put after the two ends that cause of T beam arch camber concentrated stressed, need the basis of pedestal end is handled, guarantee that pedestal is not damaged after the T beam is put an arch camber; Simultaneously, the operating condition of reasonable Arrangement material, equipment transport routes, construction water, electricity consumption, an internal drainage;
2) pedestal design, making: the beam prefabricated bed die of T adopts fixed concrete foundation steel bed die, it is precast pedestal, the pedestal base is provided with antiarch by designing requirement, locate with angle steel earlier by T beam bottom width, it is fixing to adjust the back by the antiarch requirement, angle steel and pedestal adopt embedded bar to be connected and fixed, checking correct back adopts the C30 concrete to build, simultaneously in time levelling is carried out on the surface, be convenient to lay the steel plate bed die, pedestal lower face 8cm place buries the pvc pipe of Φ 25mm internal diameter underground by each meter spacing, is used for wearing of steel form standing screw;
3) reaction beam design, making: respectively establish a length in the pedestal both sides and reach 51m, section is the steel bar concrete reaction beam of 900mm * 500mm, and spacing is 4～4.5m;
4) stretch-drawing beam design, make: adopt gooseneck form of structure, during designing and calculating, should consider to calculate the integral rigidity of stretch-drawing beam emphatically, can amount of deflection reach the requirement of tension stress, simultaneously, because presstressed reinforcing steel is more concentrated, spacing up and down has only 5cm, for the gooseneck after the perforate of lashing position, useful area falls sharply, must carry out the designing and calculating of local stiffness and strain, guarantee that the rigidity of this local location can satisfy the requirement of tensioning construction, stretch-drawing beam must be installed on the fixed support, the integral level lateral sliding of gooseneck when being convenient to integral tension;
5) the anti-design and construction of dialling stake: anti-group of stake is located at the broken line steel hinge line and bends up a below, and be by bending up apparatus and guide strip, accurate at the fixed position that bends up a little to guarantee steel hinge line; Anti-stake employing drilled pile or the steel concrete gravity abutment dialled resists and dials safety factor more than 1.5 times, and an anti-pre-buried 10mm steel plate in top of dialling is convenient to installation and is bent up device; Steel plate adopts Φ 20mm screw-thread steel to be connected with pile body master muscle, by calculating the quantity of determining screw-thread steel, prevent that built-in fitting from being transferred to when tension of prestressed tendon, tear open and constructing operation, an anti-working pit of locating to be provided with 1.5m * 1.0m * 1.0m of dialling for the ease of the peace of drag unit;
6) bend up the making of device and pre-buried: bend up device and form by rotating steel shaft base, pin, deflecting plate, guide strip, bending up apparatus is made up of two parts, comprise that the disposable use part of imbedding the beam body is connected the reusable part of usefulness with beam body below, disposable use partly comprises deflecting plate, guide strip, reuse part and comprise rotating steel shaft base, pin, guide strip and deflecting plate are combined into the cross steel work, bend up at steel strand built-in fitting a little is set, and bend up device and are connected with built-in fitting;
7) steel hinge line stretch-draw connector designs and produces: adopt fining twisted steel at the stretch-drawing beam position, the end is fixed with the spiral shell anchoring, and fining twisted steel then adopts special connector to be connected with steel hinge line;
8) reinforcing bar processing, colligation: reinforcing bar at atelier's unified allocation of materials to lower units, bend, number class stacks, and after blanking is finished, carries out merogenesis and makes, 9 meters at every joint connects into integral body after being placed to pedestal, carries out steel hinge line lashing, location then;
9) steel hinge line blanking and lashing: every beam all carries out accurate blanking, the construction of lashing in time after the blanking according to line beam, the calculated length that bends up the bundle steel hinge line;
10) tension of prestressed tendon: stressing sequence is 0 → 30% σ κ → 60% σ κ → 100% σ κ, hold lotus 2min anchoring, both sides symmetrical stretch-draw simultaneously, stretch-draw is divided into six stages: the phase I is stretched to 30% for bending up bundle, second stage is that line beam is stretched to 30%, the phase III be line beam be stretched to 60%, the quadravalence section for bend up the bundle be stretched to 60%, five-stage be line beam be stretched to 100%, the six stage for bend up the bundle be stretched to 100%; From 0～60% stage employing single tendon stretch, adopt integral tension from 60%～100% side, adopt QYC270 type, YDC2500 type, YDC5000 type hydraulic jack during stretch-draw respectively, treat to adopt mechanic jacks to do temporary fixed behind the integral tension to 100%;
11) template construct and installation: adopt the typing punching block, vertically single-unit length is 6m, panel adopts δ 10mm steel plate, angle steel with ∠ 63 * 40mm constitutes stiffening frame, to guarantee that intensity, rigidity and planeness satisfy job specfication, designing requirement, adjacent two templates adopt wedge shape to take mouth, and split bolt connects, Side Template can break away from after putting, must separate independent moulding with side form;
12) concrete build, maintenance: beam body concrete adopts placement layer by layer, layer thickness control is at 30～40cm, in the presstressed reinforcing steel zone, adopt single attached vibrator vibration compacting, for the outer zone of presstressed reinforcing steel, the method vibration compacting that then adopts poker vibrator and attached type vibrator to combine, promptly begin maintenance after the final set of beam body concrete, adopt during maintenance and cover the mode that nonwoven waters, between curing time, the beam surface must keep moisture state;
13) presstressed reinforcing steel is put and opened: presstressed reinforcing steel is put a palpus by designing requirement, beam body concrete strength reaches more than 90%, every Pin beam is put the concrete strength of opening and is wanted basically identical, in time pressure testing being carried out in test block by test room determines, and intensity is unsuitable excessive, prevent the T beam after putting to play the camber error excessive, before presstressed reinforcing steel integral body is put, must adopt device for bending up to discharge the following tensile stress that bends up a little earlier, adopt the YDC2500 type then, YDC5000 type hydraulic jack is to line beam and bend up Shu Jinhang integral body and put and open, put the Zhang Caiyong classification and put and open, about a process of putting must be accomplished, two ends symmetries with carry out synchronously;
14) the T beam goes out the hole, installs: adopt straddle truck to lift out hole and installation.
2. 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology as claimed in claim 1, it is characterized in that the pedestal middle part processing method described in the step 1) is: adopt rubble pool slag to fill earlier, after rolling compacting, the thick C30 concrete of cast 25cm bed course is built pedestal then thereon; Described pedestal two ends processing method is: because of the T beam through tensioning construction, arch upward in beam body middle part, the quality of whole beam body is shifted to being supported on the point load at two ends gradually by evenly distributed load, 50mT beam one end point load reaches 870KN, therefore adopt the C30 concrete to enlarge the basis in the beam-ends bottom, key dimension is 2.2 * 2 * 0.6m and is 20mm at concrete subfoundation configuration diameter that spacing is the steel mesh reinforcement of 20 * 20cm, with reinforcement globality and stressed needs, center base is thick 20cmC30 concrete.
3. 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology as claimed in claim 1, it is characterized in that described pedestal base is provided with antiarch by designing requirement, beam pushes up at span centre, and central sill is established the camber of downward 4cm, side bar is established the camber of downward 4.5cm, and inverted camber is pressed second-degree parabola and changed.
4. 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology as claimed in claim 1, it is characterized in that described employing gooseneck form of structure, upper and lower crossbeam adopts thick 40mm assembly welding to form, steel Q345 steel, welding rod adopts the E50 type, the cross section is 1200mm * 600mm, by steel hinge line cloth beam request top rail stand up, lower transverse beam keeps flat.
5. 50m broken-line reinforcement concrete T-shaped beam pre-tensioning system construction technology as claimed in claim 1, it is characterized in that the described Zhang Caiyong of putting classification is put opens, be divided into four-stage: the phase I opens to 60% σ κ for bending up to restraint to put, second stage is that line beam is put and opened to 60% σ κ, phase III puts and opens to zero for bending up bundle, and the quadravalence section is that line beam is put and opened to zero.
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| CN101906753B (en) * | 2010-08-16 | 2011-12-14 | 中冶建工有限公司 | Method for controlling concrete compactness at T-shaped beam deformation section of reinforced concrete prestress |
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| CN114250998A (en) * | 2018-03-22 | 2022-03-29 | 中交路桥华南工程有限公司 | T-beam prefabricating field |
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| CN109577212A (en) * | 2019-01-23 | 2019-04-05 | 中水电第十工程局（郑州）有限公司 | A kind of pretensioned prestressing Precasting Pedestal Construction method |
| CN110629685B (en) * | 2019-09-29 | 2021-08-06 | 长沙理工大学 | Method for reinforcing concrete structure based on gradient relaxation prestress |
| CN110788984A (en) * | 2019-10-28 | 2020-02-14 | 中建三局基础设施建设投资有限公司 | Precast beam making pedestal side width device and implementation method thereof |
| CN111910760B (en) * | 2020-07-08 | 2022-09-16 | 五冶集团上海有限公司 | Construction method of integral counterweight type pretensioning method prestress tensioning platform |
| CN112497479A (en) * | 2020-10-16 | 2021-03-16 | 保利长大工程有限公司 | Pre-tensioning method precast beam slab synchronous tensioning and releasing system |
| CN112412021A (en) * | 2020-11-13 | 2021-02-26 | 上海宝冶集团有限公司 | Method for building template system of large-section special-shaped bearing prefabricated multi-ribbed beam |
| CN113524434A (en) * | 2021-08-06 | 2021-10-22 | 王壹帆 | Pretensioning method concrete hollow bridge plate prestress control and preventive compensation method for loss thereof |
| CN117021301B (en) * | 2023-10-09 | 2024-03-01 | 保利长大工程有限公司 | double-T-shaped beam template capable of being tensioned with die |
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