The inclined guy cable stretching torsion-proof jack
Technical field
The invention belongs to suspension cable and steel strand tension constructing device, be specifically related to a kind of inclined guy cable stretching jack.
Background technology
The stretching construction of suspension cable all adopts the punching jack to finish at present.For by the underrelaxation high tensile steel wire, in fill out anticorrosion grease, the suspension cable that the outsourcing high density polyethylene (HDPE) constitutes.Though this kind suspension cable is called the parallel steel wire suspension cable, but in fact finished product rope in-to-in steel wire is not parallel, but there is about about 3 ° twist angle, because the existence of this twist angle, cause suspension cable can produce a turn-back power when stretch-draw, certainly will discharge at the stretch-draw end after this twisting resistance acquires a certain degree, the jacking apparatus that this power will drive the stretch-draw jack rotates together, damage jack, safety misadventure also very easily takes place simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of anti-jack that reverses of suspension cable that when stretch-draw, can prevent, to address the above problem.
Technical scheme of the present invention is: the inclined guy cable stretching torsion-proof jack, it comprises support, is provided with on the support to be no less than two oil cylinder jacks, and the piston rod of oil cylinder jack connects raising plate, establish steel strand first holding device on the raising plate, be provided with steel strand second holding device in the support; Described steel strand first holding device comprises the steel strand orienting lug, and the steel strand orienting lug offers the steel strand guide hole, is provided with the steel strand intermediate plate in the steel strand guide hole, connects positioning plate on the steel strand orienting lug; Be provided with spring between positioning plate and the steel strand guide hole; Described steel strand second holding device comprises stay bearing plate, establish the second twisted wire orienting lug on the stay bearing plate, the second steel strand orienting lug offers the second steel strand guide hole, is provided with the second steel strand intermediate plate in the second steel strand guide hole, connects second positioning plate on the second steel strand orienting lug; Be provided with spring between second positioning plate and the second steel strand guide hole.
This jack adopts a plurality of oil cylinder jacks to move simultaneously, utilizes first holding device and second holding device, when inclined guy cable stretching, alternately the Cable Stayed Steel twisted wire is implemented clamping, reaches the purpose of stretch-draw, and actv. is avoided reversing of suspension cable.It breaks the whole up into parts the jacking dynamical system, and relies on jacking apparatus to form antitorque system, has avoided twisting in the inclined guy cable stretching process; Inclined guy cable stretching is combined closely with spike and jack device, dwindled the operating altitude of inclined guy cable stretching system greatly, the requirement in inclined guy cable stretching space is obviously reduced.
Description of drawings
Fig. 1 inclined guy cable stretching torsion-proof jack structure scheme drawing.
Fig. 2 inclined guy cable stretching torsion-proof jack is arranged scheme drawing.
The specific embodiment
As shown in Figure 1, support 15 is a framed structure, comprises annular brace leg 8, establishes stay bearing plate 21 on the annular brace leg 8.Here support 15 and stay bearing plate 21 are for becoming one-piece parts.Four oil cylinder jacks 10 are located at (shown in Figure 2) on the support 15 symmetrically, and four oil cylinder jacks 10 are connected with annular brace leg 8.The piston rod 16 of oil cylinder jack 10 connects raising plate 3.Raising plate 3 connects steel strand first holding device 17.Steel strand first holding device 17 comprises and raising plate 3 bonded assembly steel strand orienting lugs 2 that steel strand orienting lug 2 can be same part with raising plate 3, also can be that interconnective two parts constitute.Present embodiment steel strand orienting lug 2 is by two parts of bolt 18 bonded assemblys with raising plate 3.Offer hole 19 on the raising plate 3.Steel strand orienting lug 2 offers steel strand guide hole 20, is provided with steel strand intermediate plate 13 in the steel strand guide hole 20.Steel strand guide hole 20 is taper, and steel strand intermediate plate 13 also is taper.Connect positioning plate 9 on the steel strand orienting lug 2.
Establishing the second twisted wire orienting lug, 4, the second steel strand orienting lugs 4 on the stay bearing plate 21 offers to be provided with in the second steel strand guide hole, 22, the second steel strand guide holes 22 on the second steel strand intermediate plate, 14, the second steel strand orienting lugs 4 and connects second positioning plate 23.The second steel strand guide hole 22 is taper, and steel strand intermediate plate 14 also is taper.Connect to breathe out floating fixed plate 6, the second twisted wire orienting lugs 4 on the concrete stay bearing plate 21 and is connected by location locker 5 with breathing out between the floating fixed plate 6, location locker 5 passes through bolt 7 and is connected with the second twisted wire orienting lug 4 with Kazakhstan floating fixed plate 6.Establish hole slot 24, the second twisted wire orienting lugs 4 bottoms on the Kazakhstan floating fixed plate 6 and be located in the hole slot 24 of breathing out floating fixed plate 6, and fixing by location locker 5.Location locker 5 is a loop configuration.Offer handle hole 11 on the annular brace leg 8.
During inclined guy cable stretching, steel strand 12 pass positioning plate 9, steel strand intermediate plate 13 and steel strand guide hole 20; Pass second positioning plate 23, steel strand intermediate plate 14 and steel strand guide hole 22 simultaneously.On the steel strand 12 between positioning plate 9 and the steel strand intermediate plate 13, be provided with spring 1; On the steel strand 12 between positioning plate 23 and the steel strand intermediate plate 14, be provided with spring 25.
Principle of work: all sub-jacks are all controlled by a cover hydraulic efficiency pressure system, have guaranteed all sub-jack combineds action, form the arm of force between each sub-jack and the steel strand, and are stressed even, produce torsion proof moment.During the jack action, the oil cylinder 10 of all sub-jacks stretches out simultaneously, drives raising plate 3 and rises, thereby driving steel strand orienting lug 2 rises, steel strand 12 are clamped the back in company with upwards elongation of steel strand orienting lug 2 by steel strand intermediate plate 13, and at this moment, steel strand intermediate plate 14 is in open state.After the oil cylinder rising of group jack puts in place, the oil pump oil return of jack, steel strand intermediate plate 14 clamps gradually in the process of oil return, the power of steel strand 12 is all transferred on the second twisted wire orienting lug 4, jack continues oil return then, because steel strand intermediate plate 13 is in the state of not stressing, steel strand intermediate plate 13 is opened in the process of jack oil return, steel strand orienting lug 2, raising plate 3 and 13 declines synchronously of steel strand intermediate plate along with the retraction of jack cylinder, oil cylinder begins jacking after all withdrawing again, repeat said process, go round and begin again like this, drive steel strand 12 and rise gradually, finish stretch-draw work.