CN114770729A - Self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam - Google Patents
Self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam Download PDFInfo
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- CN114770729A CN114770729A CN202210635965.2A CN202210635965A CN114770729A CN 114770729 A CN114770729 A CN 114770729A CN 202210635965 A CN202210635965 A CN 202210635965A CN 114770729 A CN114770729 A CN 114770729A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000004873 anchoring Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 5
- 210000002435 tendon Anatomy 0.000 claims description 3
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 230000017105 transposition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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Abstract
The invention relates to the technical field of constructional engineering, in particular to a self-sustaining load tensioning system for a prestressed bridge hollow slab with adjustable tensioning steel beams; the self-load-sustaining tensioning system for the prestressed bridge hollow slab with the adjustable tensioning steel beam comprises a bottom frame, an anchoring device and a tensioning cross beam; the underframe is a rectangular frame structure formed by connecting sectional materials; the plurality of anchoring devices are arranged at the lower part of the underframe at intervals so as to connect the underframe and the ground; the number of the tensioning beams is two, the two tensioning beams are oppositely arranged, and the tensioning beams cross the width direction of the underframe and are detachably arranged on two long edges of the underframe; the invention bears the tensile force by depending on the strength and the compression stability of the equipment, realizes the beneficial effects of convenient construction, strong expandability and low comprehensive cost, and simultaneously realizes the adjustability of the tension steel beam so as to process prestressed components with different specifications, avoid the waste of steel strands and save the production cost.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a self-sustaining load tensioning system for a prestressed bridge hollow slab with an adjustable tensioning steel beam.
Background
In order to avoid the premature occurrence of cracks in a reinforced concrete structure, high-strength steel and high-strength concrete are fully utilized, and a prestressed concrete structure is created in long-term production practice, wherein the prestressed concrete structure is characterized in that before the structural member is subjected to external load, pressure is artificially applied to the structural member, so that the generated prestressed state is used for reducing or offsetting tensile stress caused by the external load, namely the defect of tensile strength of the concrete is compensated by the higher compressive strength of the concrete, and the aim of delaying the cracking of the concrete in a tensile area is fulfilled.
In the production of prestressed members, the prestress is usually generated by tensioning high-strength steel bars or steel strands, the total tension of the steel bars or steel strands is often over 600t, and the tension needs to be balanced by an associated support reaction structure.
The traditional production mode adopts a ground load-bearing system, foundation pits with the depth of at least 2.5m and the pouring amount of at least 100t need to be manufactured at two ends of a workpiece, the tension force is counteracted by the anti-slip capacity of the foundation, the tension overturning moment is counteracted by the anti-overturning capacity of the foundation, and particularly, when the position of a tension steel strand is higher, the needed foundation is larger; therefore, the ground load-holding system has the problems of complex construction and high cost; and once the ground load-holding system is processed, the structure cannot be changed, the processing range is small, the universality is poor, and if a prestressed component with a small length needs to be processed, the waste of the steel strand can be caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-supporting load tensioning system for a prestressed bridge hollow slab with adjustable tensioning steel beams, which bears the tensioning force by means of the strength and the compressive stability of equipment, realizes the beneficial effects of convenient construction, strong expandability and low comprehensive cost, and simultaneously realizes the adjustability of the tensioning steel beams so as to process prestressed components of different specifications, thereby avoiding the waste of steel strands and saving the production cost.
In order to achieve the aim, the invention provides a self-supporting load tensioning system for a prestressed bridge hollow slab with adjustable tensioning steel beams, which comprises a bottom frame, an anchoring device and a tensioning cross beam; the underframe is a rectangular frame structure formed by connecting sectional materials; the anchoring devices are arranged at the lower part of the underframe at intervals so as to connect the underframe and the ground; the tensioning cross beams are arranged oppositely, span the width direction of the underframe and are detachably arranged on two long edges of the underframe.
Through adopting and setting up the chassis, install the structure on the chassis with the stretch-draw girder steel, realized that the intensity and the compressive stability who relies on equipment self bear the tension force, replaced in the traditional production mode, dig the complicated processing mode of foundation ditch and pouring ground, this technical scheme construction convenience, scalability is strong, if need process different specification prestressing force component, only need adjust the distance of two stretch-draw crossbeams and can realize, reduced the comprehensive cost simultaneously.
Preferably, one sides of the two tensioning beams opposite to each other are respectively provided with a fixed seat; fixing base detachably installs two long edges at the chassis, and the fixing base uses H shaped steel board as basic structure, and the interval welding has the gusset between the upper and lower flange of H shaped steel board.
Through the technical scheme that the fixing seat is arranged on one side of the tension direction of the tensioning beam, the tensioning beam is supported and further fastened, and when the tensioning beam is subjected to huge tensioning force, equipment is kept stable and does not fail due to sliding.
Preferably, one side of the fixed seat, which is far away from the tensioning cross beam, is provided with a front stop block, and the front stop block is connected with the underframe in a welding manner.
Through adopting the scheme that the preposed stop block is arranged on one side of the tension direction of the fixing seat, further supporting of the fixing seat and the tension beam is realized, the stability of equipment is kept, the tension beam and the fixing seat are prevented from losing efficacy due to sliding, and the preposed stop block and the bottom frame are connected in a welding manner, so that larger shearing force can be borne by the bolt connection of the tension beam, the fixing seat and the bottom frame.
Preferably, the tensioning beam comprises at least two steel beam plates, a vertical connecting plate and a horizontal connecting plate, and the tensioning beam is detachably arranged on one side, close to the short edge of the underframe, of the fixed seat in the vertical direction through the vertical connecting plate; the bottom surface passes through horizontal connection board detachably and installs on two long edges of chassis under the stretch-draw crossbeam, and wherein the interval has set firmly a plurality of reinforcing plates between two adjacent girder steel boards, forms the stretch-draw through-hole that supplies the prestressing tendons to pass between a plurality of reinforcing plates.
Through adopting the stack of a plurality of girder steel boards, and the interval has set firmly a plurality of reinforcing plates between two adjacent girder steel boards, with the technical scheme who founds the stretch-draw through-hole, the outstanding tensile properties of stretch-draw crossbeam has been realized, the steel strand wires of 15.2mm specification can be passed to this stretch-draw through-hole simultaneously, can pass the effect that the nominal diameter is 25 mm's finish rolling screw-thread steel again, just so can adopt finish rolling screw-thread steel as stretch-draw frock, connect finish rolling screw-thread steel stretch-draw frock and carry out the stretch-draw on the steel strand wires, do not need all to adopt the steel strand wires, can improve the utilization ratio of steel strand wires, reduce abandonment steel strand wires stub bar, reduce work piece manufacturing cost.
Preferably, the underframe is formed by connecting a plurality of H-shaped steel plates; a plurality of rib plates are welded between the upper flange and the lower flange of the H-shaped steel plate at intervals; the interval is provided with the support frame of a plurality of being on a parallel with chassis minor face between two long limits of chassis, is provided with the panel that is on a parallel with two long limits of chassis at the middle part of support frame upper surface, and the panel both sides are provided with the checkered plate that is on a parallel with the panel respectively, and checkered plate detachably installs on the support frame.
Through adopting the structure of H shaped steel board as the chassis, utilized the bending resistance of H shaped steel board good and the many good characteristics of model specification, because the chassis longeron plays the effect of the tensile force that most stretch-draw girder steel produced of transmission to should be acted on in base longeron top for the tensile force, to the base formation moment of flexure, through the bending stress of checking the longeron, select suitable section bar specification, ensure can not produce the stress and exceed standard and avoided the material waste again simultaneously.
Preferably, a plurality of groups of tensioning beam mounting holes and fixing seat mounting holes which are respectively matched with the tensioning beams and the fixing seats are arranged on the long edge of the underframe, and a front stop block is fixedly arranged on one side, far away from the tensioning beam mounting holes, of each group of fixing seat mounting holes.
Through adopting the technical scheme that a plurality of groups of mounting holes are formed in the long edge of the underframe, the position adjustability of the tensioning beam is realized, when prefabricated parts with different lengths are produced, the tensioning steel beam can be fixed at the most reasonable position, the waste of steel strands is avoided, the production cost is saved, meanwhile, the front stop blocks are arranged in front of each group of mounting holes, and the anti-sliding performance of the tensioning beam and the fixing seat at each mounting position is ensured.
Preferably, the anchoring device comprises a bottom plate, a fixing plate and chemical anchor bolts, the bottom plate is fixedly arranged on the ground through four chemical anchor bolts, one end of the fixing plate compresses a bottom flange of the H-shaped steel of the chassis, the other end of the fixing plate is detachably connected with the bottom plate, a first base plate is arranged between the fixing plate and the bottom plate, a second base plate is arranged between the fixing plate and the bottom flange of the H-shaped steel, and the distance between the anchoring device located at four corners of the chassis and the front end face of the tensioning cross beam is not less than 1.2 m.
Through the technical scheme who adopts anchor, avoided doing the deep-cut ground, the installation cost has been practiced thrift greatly, because, through checking out the pull-out force of calculating every anchor point, can rational configuration anchor point position, through multiple scheme comparison, the anchor point at stretch-draw girder steel rear has the pull-out force, the anchor point in the place ahead is the holding down force, because the compressive capacity of concrete is better and the tensile ability is not strong, need dispose the anchor point into the holding down as far as possible, and through the distance of the adjacent anchor point of rational configuration, make the pull-out force of girder steel rear anchor point be not more than 200kN, fix with 4 chemical crab-bolts and can satisfy the requirement in the C30 concrete more than 200mm, need not to do the deep-cut ground.
The distance between the anchoring devices positioned at four corners of the underframe and the front end face of the tension cross beam is not less than 1.2m, and the distance is increased from the mechanism, so that the lever action of the longitudinal beam can be utilized, the overturning moment formed by huge tension force is balanced by using a relatively small pulling force, and the anti-overturning requirement can be met as long as the mounting position closest to the short edge of the underframe is not less than 1.2m regardless of which other positions the tension cross beam is mounted at.
In addition, the scheme that the fixing plate and the screws are used for pressing the underframe on the bottom plate is adopted, so that the micro motion in the length direction of the underframe is allowed on the premise of meeting the engineering specification, the load on the concrete foundation is reduced, and meanwhile, the underframe can be pressed downwards to avoid the micro motion in the height direction of the underframe.
Preferably, the device also comprises a tension releasing system; the releasing and tensioning system comprises a releasing and tensioning oil cylinder and a releasing and tensioning beam; a piston rod of the tension releasing oil cylinder acts on the rear end of the tension beam, and a seat plate is arranged between the piston rod of the tension releasing oil cylinder and the tension beam; the rear end of the cylinder body of the tension releasing oil cylinder is connected with a tension releasing beam, the tension releasing beam and the tension stretching beam are arranged in parallel, and a tension releasing through hole corresponding to the tension through hole is formed in the tension releasing beam.
By adopting the releasing and tensioning system, the group releasing and tensioning of all the prestressed steel strands is realized after the maintenance is finished, and the individual steel strands are prevented from being broken in the tensioning process. The tension releasing system only depends on the crane to suspend, the tension releasing steel beam and the tension releasing oil cylinder are lifted, the transposition between production lines can be realized, other carrying equipment and carrying rails do not need to be additionally arranged, and the equipment purchasing cost is reduced.
Preferably, a placing and tensioning system supporting frame is expanded on one side of the underframe close to the placing and tensioning system, and the placing and tensioning system supporting frame is fixed on the ground through an anchoring device; an oil cylinder bracket is arranged on the outer side of the oil cylinder body of the tension releasing oil cylinder, a bracket slideway is connected below the oil cylinder bracket in a sliding manner, and the bracket slideway is fixedly arranged on a support frame of the tension releasing system.
Through setting up hydro-cylinder bracket and bracket slide, putting the in-process, play the guide effect to putting the removal of a system, guaranteed to put the stability of a system when opening the hydro-cylinder flexible.
Preferably, the releasing and tensioning oil cylinders are arranged in parallel in front of the releasing and tensioning beam, an oil cylinder bracket is correspondingly arranged on the outer side of each releasing and tensioning oil cylinder body, a bracket slideway is connected below the oil cylinder bracket in a sliding manner, and the bracket slideway is fixedly arranged on a releasing and tensioning system supporting frame.
By adopting the technical scheme, the plurality of the releasing cylinders are arranged, so that the stability and balance of the releasing system are ensured.
In summary, the invention has the following beneficial technical effects:
1. by adopting the structure that the bottom frame is arranged and the tension steel beam is arranged on the bottom frame, the tension force is borne by the strength and the compression stability of the equipment, and the complex processing mode of digging a foundation pit and pouring a foundation in the traditional production mode is replaced, so that the technical scheme has the advantages of convenient construction and strong expandability; through adopting the technical scheme that a plurality of groups of mounting holes are formed in the long edge of the underframe, the position adjustability of the tensioning beam is realized, and when prefabricated parts with different lengths are produced, the tensioning steel beam can be fixed at the most reasonable position, so that the waste of steel strands is avoided, and the production cost is saved.
2. The tension force that the resistance stretch-draw girder steel that the structural design of chassis can be fine produced, the high tensile strength ability of stretch-draw crossbeam has been guaranteed to the structural design of stretch-draw crossbeam, and simultaneously, the tensile strength ability of stretch-draw crossbeam has been strengthened to the design of fixing base, and the anti slippage performance of stretch-draw crossbeam and fixing base at every mounted position has been guaranteed to the design of leading dog.
3. Through the technical scheme who adopts anchor, avoided doing the deep digging ground, practiced thrift installation cost greatly, through the pull-out power of checking out every anchor point, can rationally dispose anchor point position, realized that the installation of equipment both accords with the engineering standard and can reach the most economic reasonable utilization to the raw materials again.
Drawings
FIG. 1 is a schematic view of a self-supporting load tensioning system for a prestressed bridge hollow slab with adjustable tensioning steel beams;
FIG. 2 is an enlarged view taken at I in FIG. 1;
FIG. 3 is an enlarged view taken at II in FIG. 1;
FIG. 4 is an enlarged view A taken from the point III in FIG. 1;
fig. 5 is a schematic view of an anchoring device.
Description of reference numerals: 1-a chassis; 11-a support frame; 12-a panel; 13-a checkered plate; 14-tensioning beam mounting holes; 15-a fixing seat mounting hole; 16-front stop block;
2-anchoring means; 21-a bottom plate; 22-a fixing plate; 23-chemical anchor bolt; 24-backing plate one; 25-backing plate II;
3, tensioning the cross beam; 31-a steel beam plate; 32-a vertical connection plate; 33-horizontal connecting plates; 34-a reinforcing plate; 35-tensioning the through holes;
4-fixing the base; 5-a sheet releasing system; 51-releasing the oil cylinder; 52-spreading the beam; 53-seat board; 54-opening the through hole; 55-cylinder bracket; 56-carriage slide; 57-releasing and expanding system support frame.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment discloses a self-supporting load tensioning system for a prestressed bridge hollow slab with adjustable tensioning steel beams, which refers to fig. 1 and comprises a bottom frame 1, an anchoring device 2 and a tensioning cross beam 3; the underframe 1 is a rectangular frame structure formed by connecting sectional materials; fifty-four of the anchoring devices 2, fifty-four of the anchoring devices 2 are arranged at intervals at the lower part of the chassis 1 so as to connect the chassis 1 with the ground; the number of the tensioning beams 3 is two, the two tensioning beams 3 are oppositely arranged, and the tensioning beams 3 stretch across the width direction of the underframe 1 and are detachably arranged on two long edges of the underframe 1; .
Referring to fig. 2, fixing seats 4 are respectively arranged on opposite sides of the two tensioning cross beams 3; fixing base 4 detachably installs on two long edges of chassis 1, and fixing base 4 uses H shaped steel board as basic structure, and the interval welding has the gusset between the upper and lower flange of H shaped steel board.
Referring to fig. 2, a front stop 16 is arranged on one side of the fixing seat 4 away from the tensioning beam 3, and the front stop is welded with the underframe 1.
Referring to fig. 2, the tension beam 3 comprises three steel beam plates 31, a vertical connecting plate 32 and a horizontal connecting plate 33, and the tension beam 3 is detachably mounted on one side of the fixed seat 4 close to the short side of the underframe 1 through the vertical connecting plate 32 in the vertical direction; the lower bottom surface of the tensioning beam 3 is detachably arranged on two long edges of the underframe 1 through a horizontal connecting plate 33, wherein, the two adjacent steel beam plates 31 are fixedly arranged at intervals, seven reinforcing plates 34 are arranged, and a tensioning through hole 35 for the prestressed tendon to pass through is formed between the seven reinforcing plates 34.
Referring to fig. 2 and 3, the underframe 1 is formed by connecting a plurality of H-shaped steel plates; a plurality of rib plates are welded between the upper flange and the lower flange of the H-shaped steel plate at intervals; a plurality of supporting frames 11 parallel to the short edges of the bottom frame 1 are arranged between the two long edges of the bottom frame 1 at intervals, panels 12 parallel to the two long edges of the bottom frame 1 are arranged in the middle of the upper surface of each supporting frame 11, checkered plates 13 parallel to the panels 12 are arranged on the two sides of each panel 12 respectively, and the checkered plates 13 are detachably mounted on the supporting frames 11.
Referring to fig. 1 and 3, six groups of tensioning beam mounting holes 14 and fixing seat mounting holes 15 which are respectively matched with the tensioning beams 3 and the fixing seats 4 are arranged on the long edge of the underframe 1, and a front stop dog 16 is fixedly arranged on one side, far away from the tensioning beam mounting holes 14, of each group of fixing seat mounting holes 15, so that the anti-sliding performance of the tensioning beams 3 and the fixing seats 4 at each mounting position is ensured.
Referring to fig. 1 and 5, the anchoring device 2 includes a bottom plate 21, a fixing plate 22 and four chemical anchor bolts 23, the bottom plate 21 is fixed in C30 concrete over 200mm through the four chemical anchor bolts 23, the pulling-up force of each anchoring point is calculated through checking, the position of the anchoring point can be configured reasonably, through comparison of various schemes, the anchoring point at the rear of the steel beam 3 has the pulling-up force, the anchoring point at the front is the down force, because the concrete has better compression resistance and weak tensile resistance, the anchoring point needs to be configured into down pressure as much as possible, and the pulling-up force of the anchoring point at the rear of the steel beam 3 is not more than 200kN through reasonably configuring the distance between the adjacent anchoring points, wherein the distance between the anchoring device 2 at the four corners of the underframe 1 and the front end surface of the tension beam 3 is not less than 1.2 m.
Referring to fig. 5, one end of the fixing plate 22 presses the bottom flange of the H-section steel of the underframe 1, the other end of the fixing plate 22 is detachably connected with the bottom plate 21, a first cushion plate 24 is arranged between the fixing plate 22 and the bottom plate 21, and a second cushion plate 25 is arranged between the fixing plate 22 and the bottom flange of the H-section steel, so that the design allows the underframe 1 to slightly move in the length direction to reduce the load on the concrete foundation, but simultaneously the underframe 1 can be pressed downwards to avoid the slight movement in the height direction of the underframe 1.
Referring to fig. 4, a sheet placing system 5 is further included; the tension releasing system 5 comprises two tension releasing oil cylinders 51 and a tension releasing beam 52; two tension releasing oil cylinders 51 are arranged in parallel at the positions close to the two ends in front of the tension releasing beam 52, piston rods of the tension releasing oil cylinders 51 act on the rear ends of the tension beams 3, and seat plates 53 are arranged between the piston rods of the tension releasing oil cylinders 51 and the tension beams 3; the rear end of the cylinder body of the tension releasing oil cylinder 51 is connected with a tension releasing beam 52, the tension releasing beam 52 is arranged in parallel with the tension beam 3, and a tension releasing through hole 54 corresponding to the tension through hole 35 is formed in the tension releasing beam 52; and after the maintenance is finished, releasing all groups of the prestressed steel strands, and preventing individual steel strands from breaking in the tensioning process. This put a system 5 and only rely on the overhead traveling crane to hang, will put a girder steel 52 and hang away together with putting a hydro-cylinder 51, can realize the transposition between the production line, need not to add other haulage equipment and transport track, reduced the equipment acquisition cost.
Referring to fig. 4, a tension releasing system support frame 57 is extended from one side of the underframe 1 close to the tension releasing system 5, and the tension releasing system support frame 57 is fixed on the ground through the anchoring device 2; an oil cylinder bracket 55 is arranged on the outer side of the body of the tension releasing oil cylinder 51, a bracket slideway 56 is connected below the oil cylinder bracket 55 in a sliding manner, and the bracket slideway 56 is fixedly arranged on a tension releasing system supporting frame 57; the stability and balance of the sheet releasing system 5 are ensured.
The above embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above embodiments with modifications and variations to the disclosed technical content to apply the equivalent embodiments in other fields, but any simple modification and equivalent variation made on the above embodiments according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a stretch-draw girder steel adjustable prestressing force bridge hollow slab self-sustaining lotus stretch-draw system which characterized in that: comprises an underframe (1), an anchoring device (2) and a tension beam (3);
the underframe (1) is a rectangular frame structure formed by connecting sectional materials;
the anchoring devices (2) are arranged in plurality, and the plurality of anchoring devices (2) are arranged at the lower part of the underframe (1) at intervals so as to connect the underframe (1) with the ground;
stretch-draw crossbeam (3) have two, two stretch-draw crossbeam (3) set up relatively, stretch-draw crossbeam (3) span the width direction of chassis (1) to detachably installs on two long limits of chassis (1).
2. A self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioned steel beam as claimed in claim 1, characterized in that: one sides of the two tensioning cross beams (3) opposite to each other are respectively provided with a fixed seat (4); the fixing seat (4) is detachably mounted on two long edges of the base frame (1), the fixing seat (4) adopts an H-shaped steel plate as a basic structure, and rib plates are welded between an upper flange and a lower flange of the H-shaped steel plate at intervals.
3. A self-supporting tension system for prestressed bridge hollow slab with adjustable tension steel beam as claimed in claim 2, wherein: one side of the fixed seat (4) far away from the tensioning cross beam (3) is provided with a front stop block (16), and the front stop block is connected with the bottom frame (1) in a welding mode.
4. A self-supporting tension system for prestressed bridge hollow slab with adjustable tension steel beam as claimed in claim 2, wherein: the tensioning cross beam (3) comprises at least two steel beam plates (31), a vertical connecting plate (32) and a horizontal connecting plate (33), and the tensioning cross beam (3) is detachably mounted on one side, close to the short side of the underframe (1), of the fixed seat (4) through the vertical connecting plate (32) in the vertical direction; stretch-draw crossbeam (3) bottom surface passes through horizontal connection board (33) detachably and installs on two long edges of chassis (1), wherein the interval has set firmly a plurality of reinforcing plates (34), a plurality of between two adjacent girder steel boards (31) form stretch-draw through-hole (35) that supply the prestressing tendons to pass between reinforcing plate (34).
5. A self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam as claimed in claim 1, characterized in that: the underframe (1) is formed by connecting a plurality of H-shaped steel plates; a plurality of rib plates are welded between the upper flange and the lower flange of the H-shaped steel plate at intervals; the utility model discloses a decorative pattern plate, including chassis (1), panel (12), interval are provided with a plurality of support frames (11) that are on a parallel with chassis (1) minor face between two long limits of chassis (1) the interval be provided with panel (12) that are on a parallel with two long limits of chassis (1) the middle part of support frame (11) upper surface, panel (12) both sides are provided with decorative pattern plate (13) that are on a parallel with panel (12) respectively, decorative pattern plate (13) detachably installs on support frame (11).
6. A self-supporting tension system for prestressed bridge hollow slab with adjustable tension steel beam as claimed in claim 2, wherein: chassis (1) long edge is provided with the multiunit respectively with stretch-draw crossbeam (3) and fixing base (4) complex stretch-draw crossbeam mounting hole (14) and fixing base mounting hole (15), keeps away from one side of stretch-draw crossbeam mounting hole (14) at every fixing base mounting hole (15) and all has set firmly leading dog (16).
7. A self-supporting load tensioning system for prestressed bridge hollow slabs with adjustable tensioned steel beams as claimed in claim 5, characterized in that: anchoring device (2) are including bottom plate (21), fixed plate (22) and chemical crab-bolt (23), bottom plate (21) set firmly subaerial through chemical crab-bolt (23), the bottom flange of the H shaped steel of fixed plate (22) one end compression chassis (1), fixed plate (22) other end and bottom plate (21) can be dismantled and be connected, be provided with backing plate (24) between fixed plate (22) and bottom plate (21), be provided with backing plate two (25) between the bottom flange of fixed plate (22) and H shaped steel, the distance between the terminal surface is not less than 1.2m before anchoring device (2) that are located chassis four corners and stretch-draw crossbeam (3).
8. A self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioned steel beam as claimed in claim 3, characterized in that: also comprises a sheet placing system (5); the tension releasing system (5) comprises a tension releasing oil cylinder (51) and a tension releasing beam (52); a piston rod of the relaxation oil cylinder (51) acts on the rear end of the tensioning beam (3), and a seat plate (53) is arranged between the piston rod of the relaxation oil cylinder (51) and the tensioning beam (3); put the cylinder body rear end of a hydro-cylinder (51) and connect put a crossbeam (52), put a crossbeam (52) with stretch-draw crossbeam (3) parallel arrangement, put and be provided with on the crossbeam (52) and put a through-hole (54) with stretching-draw through-hole (35) correspondence.
9. A self-supporting tension system for prestressed bridge hollow slab with adjustable tension steel beam as claimed in claim 8, wherein: a placing and expanding system supporting frame (57) is expanded on one side, close to the placing and expanding system (5), of the underframe (1), and the placing and expanding system supporting frame (57) is fixed on the ground through an anchoring device (2); an oil cylinder bracket (55) is arranged on the outer side of the cylinder body of the tension oil cylinder (51), a bracket slide way (56) is connected below the oil cylinder bracket (55) in a sliding manner, and the bracket slide way (56) is fixedly arranged on a tension system support frame (57).
10. A self-supporting load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam as claimed in claim 9, characterized in that: put a hydro-cylinder (51) and have a plurality ofly, a plurality ofly put a hydro-cylinder (51) parallel arrangement and put a crossbeam (52) preceding, every puts a hydro-cylinder (51) cylinder body outside and all corresponds and be provided with hydro-cylinder bracket (55), hydro-cylinder bracket (55) below sliding connection has bracket slide (56), bracket slide (56) set firmly on putting a system support frame (57).
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| CN202210635965.2A CN114770729B (en) | 2022-06-07 | 2022-06-07 | Self-sustaining load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam |
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| CN202210635965.2A CN114770729B (en) | 2022-06-07 | 2022-06-07 | Self-sustaining load tensioning system for prestressed bridge hollow slab with adjustable tensioning steel beam |
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| CN114770729B CN114770729B (en) | 2023-11-28 |
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| CN211074122U (en) * | 2019-11-14 | 2020-07-24 | 中铁二局集团有限公司 | Bridge deck slab prefabrication, tensioning and anchoring device adopting steel truss girder pretensioning method |
| CN216266756U (en) * | 2021-11-12 | 2022-04-12 | 湖州天逸预制构件有限公司 | Pretensioned prestressing tension end reinforcing device |
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| US6773650B1 (en) * | 2001-03-21 | 2004-08-10 | Power Poles, Inc. | Prestressed concrete casting apparatus and method |
| CN2573616Y (en) * | 2002-09-05 | 2003-09-17 | 天津市天佳设备安装公司 | Built-up steel structure pretensioned pedestal |
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| CN114770729B (en) | 2023-11-28 |
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