CN101476393B - Pretensioned prestressing stretch-drawing beam and its production method - Google Patents
Pretensioned prestressing stretch-drawing beam and its production method Download PDFInfo
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- CN101476393B CN101476393B CN2008103058511A CN200810305851A CN101476393B CN 101476393 B CN101476393 B CN 101476393B CN 2008103058511 A CN2008103058511 A CN 2008103058511A CN 200810305851 A CN200810305851 A CN 200810305851A CN 101476393 B CN101476393 B CN 101476393B
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Abstract
The invention discloses a pretensioning method prestressing tensioning cross beam. An upper cross beam and a lower cross beam are formed into a post tension concrete structure respectively through pouring concrete into a frame formed by a binding reinforcing steel bar (2), a steel strand anchor bearing steel plate (1) and a corrugated pipe (3), wherein the transverse middle part of the binding reinforcing steel bar (2) structure is provided with the steel strand anchor bearing steel plate (1), and the corrugated pipe (3) is inserted in the long direction of the binding reinforcing steel bar (2) structure. The invention also discloses a method for manufacturing the tensioning cross beam. The tensioning cross beam has the advantages of larger local part and integral rigidities, no local deformation of the anchor bearing steel plate, low steel consumption, low production cost, and obvious price advantage compared with a steel cross beam under a large-tonnage condition. The price of the prestressed concrete tensioning cross beam is more than 50 percent lower than that of the steel cross beam. The pretensioning method prestressing tensioning cross beam is produced according to the prior prestressed concrete component so that the production manufacturing is comparatively simple.
Description
Technical field
The present invention relates to pretensioning prestressed concrete structure manufacturing equipment, especially relate to a kind of Pretensioned prestressing stretch-drawing beam and preparation method, the pretensioning prestressed concrete stretch-drawing beam that the present invention adopts can be widely used in the stretch-draw of presstressed reinforcing steel in the pretensioning prestressed concrete structure under the various tonnage conditions.
Background technology
Stretch-drawing beam is the key equipment that the pretensioning prestressed concrete structure is made, and occupies larger specific gravity in whole pre-tensioning system production equipment expense.Because domestic job specfication is very high to the rigidity requirement of stretch-drawing beam crossbeam, the span centre maximum defluxion f≤2mm of construction of the highway code requirement crossbeam wherein, so stretch-drawing beam structural section size is relatively very big, especially remarkable under the large-tonnage condition.The Yellow River, Juancheng, Shandong highway bridge access bridge superstructure adopts 50m pre-tensioning system broken-line reinforcement prestressed concrete T beam simply, the about 180t of the maximum deadweight of monolithic T beam, maximum applies the about 1200t of prestressing force gross tonnage, in the domestic highway territory.Safe and reliable for guaranteeing that prestressing force applies in the process, requiring to be equipped with reasonable, economic stretch-drawing beam is the beam prefabricated key link of T.
In the construction of domestic and international existing pretensioning prestressed concrete structure, stretch-drawing beam adopts substantially: two kinds of form of structure of gooseneck and steel concrete crossbeam.Scheme one is most widely used, and construction field at home and abroad is widely used under the different tension tonnage conditions, and the maximum tonnage of present domestic application is a 32m pre-tensioning system broken-line reinforcement case beam, the about 5400t of maximum stretch-draw gross tonnage.Gooseneck has that machining accuracy height, batch production degree height, process-cycle are short, structural mechanical property advantages such as evenly (tension of material, resistance to compression permissible stress value big) and deadweight be lighter.But the processing technology complexity of steel work is highly specialized, and the steel work steel using amount is big simultaneously, cost is high, and particularly under the large-tonnage condition, the proportion that stretch-drawing beam accounts for whole tooling device expense will significantly rise.Scheme two is used less at home and abroad, be mainly used in the production of little span structure, under the situation that simultaneous tension crossbeam effective span is little and tension tonnage is less, range of application is little, and the great advantage infrastructure cost of this scheme is low, process simple relatively, but manufacturing procedure is many, and the stretch-drawing beam effective span is little, and depth of section is big, from great, the structure bending resistance is poor, can not be applied to large-tonnage stretch-draw.
Prestressing technique can provide the bearing capacity of greatly improving the steel concrete stretch-drawing beam, can give full play to concrete resistance to compression mechanical property, improve the bending rigidity of structure, so the stretch-drawing beam that adopts prestress system provides new thinking for the stretch-draw of first Zhang Liang.
Summary of the invention
The objective of the invention is to: according to the tension tonnage requirement of T beam 1200t simply of the Yellow River, Juancheng, Shandong highway grand bridge access bridge 50m pre-tensioning system broken-line reinforcement prestressed concrete, solving existing construction problem, satisfy under design specifications and the prerequisite that requires such as safe and practical, the stretch-drawing beam that designs a kind of prestress system is with preparation method; The construction requirement of the also applicable more large-tonnage Zhang Liang of elder generation of while this kind system stretch-drawing beam.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of Pretensioned prestressing stretch-drawing beam, comprise top rail and lower transverse beam, concrete perfusion forms post-stressed concrete structure in the framework that described top rail and lower transverse beam are formed by assembling reinforcement, steel strand anchoring pressure-bearing steel plate, bellows respectively, wherein the lateral middle in the assembling reinforcement structure is equipped with steel strand anchoring pressure-bearing steel plate, the assembling reinforcement structure vertically on be installed with bellows.
The steel strand anchoring pressure-bearing steel plate of described top rail and lower transverse beam is made of many steel pipes between two gripper shoes and two gripper shoes, and stretch out respectively outside two gripper shoes at the two ends of described steel pipe.
The center line of the group row that many steel pipes of described lower transverse beam are formed is positioned at the lower transverse beam horizontal center line or is positioned at the top of lower transverse beam horizontal center line.
A kind of preparation method of stretch-drawing beam is characterized in that: carry out as follows:
1), pressure-bearing steel plate, presstressed reinforcing steel reserving hole channel, tie with reinforcing bar
1. make the stretch-drawing beam prefabricated platform, the brushing interleaving agent is installed steel strand anchoring pressure-bearing steel plate and steel strand reserving hole channel steel pipe and is welded into integral body;
2. the colligation plain bars, wear bellows, fulcrum pressure-bearing steel plate is installed at last, want colligation number layer reinforced mesh in the fulcrum side and the steel strand anchoring pressure-bearing steel plate side of crossbeam;
2), formwork erection, concreting, maintenance
1. reinforcing bar and built-in fitting install qualified on inspection after, anchor plate, formwork erection, steel strand are installed, can concrete perfusion after confirming on inspection;
2. the stretch-draw concrete adopts the C50 concrete, because stretch-drawing beam is shorter, concrete spouting adopts oblique layering, one-time formed technology, adopts internal vibration; Drag before and after the steel strand after concreting finishes, it is seesawed in bellows, avoid because the plugging of pipeline spillage;
3. cover and the watering maintenance after the stretch-drawing beam perfusion finished 2 hours, maintenance is as the criterion so that concrete surface is moistening;
3), tension of prestressed tendon, mud jacking, sealing off and covering anchorage
1. reach the standard of C50 when concrete strength, can carry out stretch-draw, single-ended stretch-draw is adopted in stretch-draw, stretch-draw is controlled to be auxilliary based on Stress Control, stretch value, carry out two controls, stretch-draw finishes the back and adopts toothless saw to cut off steel strand, the steel strand protruded length 4cm ± 1cm after the cut-out;
2. pipeline pneumatic mortar requires to finish in 3 days after stretch-draw, and intrusion concrete requires water/binder ratio less than 0.45, and 24h seals the anchor head of an end earlier before the R28 〉=40Mpa, mud jacking with cement mortar, from other end mud jacking;
3. treat that pipeline pneumatic mortar after 3～7 days, gets final product sealing off and covering anchorage, before sealing off and covering anchorage, at first clean out anchor plate, concrete surface laitance, colligation sealing off and covering anchorage reinforced mesh, mounting template is built the sealing off and covering anchorage concrete.
The invention has the beneficial effects as follows:
1., stretch-drawing beam of the present invention has bigger part and integral rigidity, anchoring pressure-bearing steel plate does not have local distortion, does not relatively have local stable problem with traditional gooseneck.Span centre maximum displacement of the present invention is satisfied code requirement less than 1.5mm.Traditional gooseneck requires needs to weld a lot of diaphragms and stiffening rib in order to satisfy local stiffness and structure, and the present invention does not need, and has reduced cost;
2., steel using amount is low, cost of production is low, and is obvious than the gooseneck price advantage under the large-tonnage situation.Prestressed concrete stretch-drawing beam of the present invention is low more than 50% than the gooseneck price.
3., the present invention is according to conventional prestressed concrete member production, manufactures simple relatively.
Description of drawings
Fig. 1 is the structural representation of top rail among the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of lower transverse beam among the present invention, is the lower transverse beam structural representation of central sill simultaneously, is first kind of embodiment of the present invention;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the structural representation of lower transverse beam among the present invention, is the lower transverse beam structural representation of side bar simultaneously, is second kind of embodiment of the present invention;
Fig. 6 is the vertical view of Fig. 5;
Fig. 7 is the structural framing figure of the present invention's top rail of constituting post-stressed concrete structure;
Fig. 8 is the vertical view of Fig. 7;
Fig. 9 is the structural framing figure of the present invention's lower transverse beam of constituting post-stressed concrete structure;
Figure 10 is the vertical view of Fig. 9.
The specific embodiment
1, stretch-drawing beam structure and design of reinforcement
At first the stretch-drawing beam mechanical model is reduced to the middle part and bears the simply supported beam of point load effect, simply supported beam is supported at both ends on the force-transmitting pole.According to the least favorable load that in work progress, may occur (the least favorable load is that the super top loading when putting carries), determine the maximum internal force of structure.According to the layout of the cross section of structure internal force figure project organization, presstressed reinforcing steel, ordinary constitution reinforcing bar, pressure-bearing steel plate etc.Simply supported beam is according to full prestressing structure design arrangement of reinforcement, and maximum mid-span deflection is less than 2mm.
2, stretch-drawing beam of the present invention is made of top rail and lower transverse beam, top rail is positioned over the lower transverse beam top by mounting bracket, wherein lower transverse beam is divided into central sill or side bar, no matter lower transverse beam is central sill or side bar, and top rail all is the same structure, (in the pre-tensioning system construction of prestressed concrete structure, the stretch-draw of presstressed reinforcing steel, 42 line beams adopt side bar, and 36 line beams adopt central sill, and the broken line bundle all is 18).
Embodiment 1:(lower transverse beam is a side bar)
A kind of structure of Pretensioned prestressing stretch-drawing beam is seen Fig. 1, Fig. 2, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, shown in Figure 10: concrete perfusion forms post-stressed concrete structure in the framework that described top rail and lower transverse beam are formed by assembling reinforcement 2, steel strand anchoring pressure-bearing steel plate 1, bellows 3 respectively, wherein the lateral middle in assembling reinforcement 2 structures is equipped with steel strand anchoring pressure-bearing steel plate 1, assembling reinforcement 2 structures vertically on be installed with bellows 3.The steel strand anchoring pressure-bearing steel plate 1 of described top rail and lower transverse beam is made of the many steel pipes 5 between two gripper shoes 4 and two gripper shoes, and stretch out respectively outside two gripper shoes at the two ends of described steel pipe.The center line of the group row that many steel pipes of described lower transverse beam 5 are formed is positioned at the top of crossbeam center line.
Embodiment 2:(lower transverse beam is a central sill)
A kind of structure of Pretensioned prestressing stretch-drawing beam is seen Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 7, Fig. 8, Fig. 9, shown in Figure 10: concrete perfusion forms post-stressed concrete structure in the framework that described top rail and lower transverse beam are formed by assembling reinforcement 2, steel strand anchoring pressure-bearing steel plate 1, bellows 3 respectively, wherein the lateral middle in assembling reinforcement 2 structures is equipped with steel strand anchoring pressure-bearing steel plate 1, assembling reinforcement 2 structures vertically on be installed with bellows 3.The steel strand anchoring pressure-bearing steel plate 1 of described top rail and lower transverse beam is made of the many steel pipes 5 between two gripper shoes 4 and two gripper shoes, and stretch out respectively outside two gripper shoes at the two ends of described steel pipe.The center line of the group row that many steel pipes of described lower transverse beam 5 are formed is positioned at the crossbeam horizontal center line.
3, the preparation method of stretch-drawing beam of the present invention
Stretch-drawing beam is a post-stressed concrete structure, according to each link of construction of the highway standard relevant requirements control construction.Concrete adopts C50 level, proof stress σ con=0.72fyj under the anchor of presstressed reinforcing steel, pipeline pneumatic mortar cement paste R28 〉=40 Mpa.
1), pressure-bearing steel plate, presstressed reinforcing steel reserving hole channel, tie with reinforcing bar
1. make the stretch-drawing beam prefabricated platform, brushing interleaving agent (commercial product).Steel strand anchoring pressure-bearing steel plate and steel strand reserving hole channel steel pipe are installed are welded into integral body.Installation process will guarantee steel strand anchoring bearing plate plummet, straight, the no side sway of steel pipe, and skeleton is firm.
2. the colligation plain bars, wear bellows, fulcrum pressure-bearing steel plate is installed at last.Wherein want colligation number layer reinforced mesh to guarantee the needs of partial pressing in the fulcrum side and the steel strand anchoring bearing plate side of crossbeam.
2), formwork erection, concreting, maintenance
1. reinforcing bar and built-in fitting install qualified on inspection after, anchor plate, formwork erection, steel strand are installed, confirm that on inspection compliant can concrete perfusion after requiring.
2. the stretch-draw concrete adopts the C50 concrete, because stretch-drawing beam is shorter, concrete spouting adopts oblique layering, one-time formed technology (for traditional handicraft), adopts internal vibration.To drag before and after the steel strand after concreting finishes, it is seesawed in bellows, avoid because the plugging of pipeline spillage.
3. cover and the watering maintenance after the stretch-drawing beam perfusion finished 2 hours, maintenance is as the criterion so that concrete surface is moistening.
3), tension of prestressed tendon, mud jacking, sealing off and covering anchorage
1. reach the standard of C50 when concrete strength, can carry out stretch-draw.Single-ended stretch-draw is adopted in stretch-draw, and stretch-draw is controlled to be auxilliary based on Stress Control, stretch value, carries out two controls.Stretch-draw finishes the back and adopts toothless saw to cut off steel strand, the steel strand protruded length 4cm ± 1cm after the cut-out.
2. pipeline pneumatic mortar requires to finish in 3 days after stretch-draw, and intrusion concrete requires water/binder ratio less than 0.45, R28 〉=40Mpa.24h seals the anchor head of an end earlier before the mud jacking with cement mortar, from other end mud jacking.
3. treat that pipeline pneumatic mortar after 3～7 days, gets final product sealing off and covering anchorage.Before sealing off and covering anchorage, at first clean out anchor plate, concrete surface laitance, colligation sealing off and covering anchorage reinforced mesh, mounting template is built the sealing off and covering anchorage concrete.
Claims (4)
1. Pretensioned prestressing stretch-drawing beam, comprise top rail and lower transverse beam, it is characterized in that: concrete perfusion forms post-stressed concrete structure in the framework that described top rail and lower transverse beam are formed by assembling reinforcement (2), steel strand anchoring pressure-bearing steel plate (1), bellows (3) respectively, wherein the lateral middle in assembling reinforcement (2) structure is equipped with steel strand anchoring pressure-bearing steel plate (1), assembling reinforcement (2) structure vertically on be installed with bellows (3).
2. Pretensioned prestressing stretch-drawing beam according to claim 1, it is characterized in that: the steel strand anchoring pressure-bearing steel plate (1) of described top rail and lower transverse beam is made of the many steel pipes (5) between two gripper shoes (4) and two gripper shoes, and stretch out respectively outside two gripper shoes at the two ends of described steel pipe.
3. Pretensioned prestressing stretch-drawing beam according to claim 2 is characterized in that: the center line of the group row that many steel pipes of described lower transverse beam (5) are formed is positioned at the lower transverse beam horizontal center line or is positioned at the top of lower transverse beam horizontal center line.
4. the preparation method of a stretch-drawing beam is characterized in that: carry out as follows:
1), pressure-bearing steel plate, presstressed reinforcing steel reserving hole channel, tie with reinforcing bar
1. make the stretch-drawing beam prefabricated platform, the brushing interleaving agent is installed steel strand anchoring pressure-bearing steel plate and steel strand reserving hole channel steel pipe and is welded into integral body;
2. the colligation plain bars, wear bellows, fulcrum pressure-bearing steel plate is installed at last, want colligation number layer reinforced mesh in the fulcrum side and the steel strand anchoring pressure-bearing steel plate side of crossbeam;
2), formwork erection, concreting, maintenance
1. reinforcing bar and built-in fitting install qualified on inspection after, anchor plate, formwork erection, steel strand are installed, can concrete perfusion after confirming on inspection;
2. the stretch-draw concrete adopts the C50 concrete, because stretch-drawing beam is shorter, concrete spouting adopts oblique layering, one-time formed technology, adopts internal vibration; Drag before and after the steel strand after concreting finishes, it is seesawed in bellows, avoid because the plugging of pipeline spillage;
3. cover and the watering maintenance after the stretch-drawing beam perfusion finished 2 hours, maintenance is as the criterion so that concrete surface is moistening;
3), tension of prestressed tendon, mud jacking, sealing off and covering anchorage
1. reach the standard of C50 when concrete strength, can carry out stretch-draw, single-ended stretch-draw is adopted in stretch-draw, stretch-draw is controlled to be auxilliary based on Stress Control, stretch value, carry out two controls, stretch-draw finishes the back and adopts toothless saw to cut off steel strand, the steel strand protruded length 4cm ± 1cm after the cut-out;
2. pipeline pneumatic mortar requires to finish in 3 days after stretch-draw, and intrusion concrete requires water/binder ratio less than 0.45, and 24h seals the anchor head of an end earlier before the R28 〉=40Mpa, mud jacking with cement mortar, from other end mud jacking;
3. treat that pipeline pneumatic mortar after 3～7 days, gets final product sealing off and covering anchorage, before sealing off and covering anchorage, at first clean out anchor plate, concrete surface laitance, colligation sealing off and covering anchorage reinforced mesh, mounting template is built the sealing off and covering anchorage concrete.
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| CN102086701A (en) * | 2010-12-23 | 2011-06-08 | 葛洲坝集团第一工程有限公司 | Prestressed tensioning construction method |
| CN102561202B (en) * | 2012-02-15 | 2013-11-13 | 中南大学 | Construction method of preloaded and prestressed bridge |
| CN102535346B (en) * | 2012-02-15 | 2013-12-18 | 中南大学 | Construction method of preloaded prestressed bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608312A (en) * | 2020-05-21 | 2020-09-01 | 南通四建集团有限公司 | Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method |
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Effective date of registration: 20190124 Address after: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Co-patentee after: CHINA RAILWAY ERJU 1ST ENGINEERING Co.,Ltd. Patentee after: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. Address before: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Patentee before: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. |