CN2183987Y

CN2183987Y - Asynchronous lifter with single cylinder and muti-rod

Info

Publication number: CN2183987Y
Application number: CN 93246127
Authority: CN
Inventors: 郝晋升
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-04
Filing date: 1993-12-04
Publication date: 1994-11-30
Anticipated expiration: 2003-12-04

Abstract

The utility model relates to an asynchronous lifter which enables a plurality of ropes to obtain equal stretching force, and belongs to the technical field of work machines. The utility model is composed of a cylinder body, an end plate, a screw plug baffle ring, piston top rods, sealing components, tool anchor components, a hydraulic transmission system, supporting legs, etc. The utility model is provided with a plurality of piston top rods and tool anchor components which can stretch every strand of steel strands. Pressure medium in the cylinder body acts on the piston top rods with identical structure so as to ensure that every steel strand can obtain equal traction force, fully exert the efficiency of the steel strands, and ensure construction quality of engineering. The asynchronous lifter can be widely used for technology implementation of strengthening treatment of prestressing anchorage cable in engineering such as buildings, bridges, side slopes, etc.

Description

Asynchronous lifter with single cylinder and muti-rod

The utility model relates to a kind of with employed many ropes on the load, the work tool that club obtains to equate stretching force or propelling thrust of directly acting on of operations such as lifting, traction, pushing tow, belongs to the Work machine technical field.It can be widely used in engineerings such as building, hydro-structure, Prestressed Concrete Bridges, Excitations for Long Span Suspension, side slope, the dam foundation and carry out the technology implementation that prestressed anchor reinforcement is handled, and being specially adapted to adopt many steel strand is the technology implementation that a branch of prestressed anchor reinforcement is handled.

At present, the lot of domestic and international engineering item all adopts the prestressed anchor reinforcement technical finesse.Prestressed anchor reinforcement is to realize by the chucking of the pretension stretch-draw of steel strand and ground tackle is located, and in order to improve the effect that anchor cable reinforces and the quality of engineering, the steel strand of use are many and are a branch of steel wire bundle.Existing anchorage technology mainly contains dual mode to the pretension stretch-draw of steel wire bundle: the whole synchronous mode stretch-draw of the first; It two is packet type stretch-draw.Because the tightness of every steel strand initial condition differs in the steel wire bundle, so carry out stretch-draw no matter adopt above-mentioned any mode, its result must be that the size of every steel twisted-line tension-force in the steel wire bundle is unequal each other, not only can not give full play to the usefulness of every steel strand, and influence construction quality.

Chinese patent 932193099 described " many are waited pulling force asynchronous traction device ", the tension stress of each root steel strand in the steel wire bundle is equated, but there is such shortcoming in it: in (1) cylinder body a plurality of piston holes are arranged, the aperture is little, depth size is big, processing difficulties; (2) raceway groove of a plurality of each piston hole of connection is arranged in the cylinder body, this structure not only makes troubles to processing and manufacturing, and has reduced the intensity of cylinder body; The draw bar that is the stepped shaft shape when (3) working, less one section of its diameter dimension is bearing the radial pressure of hydraulic medium and the axial tension of load, the effect of radial pressure and axial tension all makes its diameter diminish, and has strengthened difficulty for the dynamic seal of mode of operation; (4) the moveable anchor assembly is between cylinder body and work anchor assembly, inconvenient operation.

The purpose of this utility model is that device is drawn on the asynchronous tops of power such as the many bars of a kind of single cylinder that provide for the shortcoming that overcomes above-mentioned prior art, and it is rational in infrastructure, easy to operate, be easy to processing and manufacturing, can guarantee all to be equated by the tension stress of each root steel strand in the steel wire bundle of stretch-draw again.

The utility model can be realized by following measure: this top draws device to be made up of cylinder body, end plates, plug screw baffle ring, piston mandril, poted assemblies, moveable anchor assembly, the power hydraulic system that comprises compression indicator, feet etc.The cylinder body that is assembled together, end plates, plug screw baffle ring, piston mandril, poted assemblies etc. constitute a pressure chamber, the variable section position that exterior contour is a plurality of piston mandrils of stepped shaft shape is in the pressure chamber, driven by a cover power hydraulic system, each piston mandril cooperates the tractive end of negative transversal of jack-up (as steel strand etc.) through the moveable anchor assembly.The difference of the area of a circle that cylindrical surrounded of piston mandril enlarged diameter section and the area of a circle that cylindrical surrounded of reduced diameter section is an effective cross sectional area.According to the hydraulic principle, the product of the effective cross sectional area of piston mandril and the operation pressure of hydraulic medium (pressure) has determined hydraulic medium to the size of piston mandril along its axis direction thrust, as long as the structure of each piston mandril is identical, effective cross sectional area equates that then hydraulic medium also equates the axial thrust of each piston mandril.

Structural representation of the present utility model is seen Fig. 1.Available any type of power hydraulic system (7), the size of its rated oil pressure is selected by the loading of target institute.The rear end of cylinder body (1) is an open end, and end plates (2) are arranged, and plug screw baffle ring (3) connects with cylinder body (1) by screw thread, and end plates (2) directionality is arranged are fixed tightly in the cylinder body (1).On the bottom of cylinder body (1) and end plates (2), there is quantity to equate, the cooresponding each other axially extending bore in orientation, the quantity in hole what and position distribution are on requirement of engineering and easy to processly decide, the through-hole aperture of cylinder body (1) bottom is less than the through-hole aperture on the end plates (2), identical in the orientation, cooresponding each other each in the big small through hole, each places a piston mandril that can move back and forth along axis direction (4), the hole count of the quantity of piston mandril (4) and cylinder body (1) bottom, hole count on the end plates (2) and the steel strand radical in a branch of steel strand equate that the axis of each piston mandril is parallel to each other.There is an axially extending bore in the axle center of piston mandril (4), and its exterior contour is the stepped shaft of a variable section, and the hole of reduced diameter section and cylinder body (1) bottom cooperates, and enlarged diameter section cooperates with hole on the end plates (2).A moveable anchor assembly (6) is laid in the end of each piston mandril (4) enlarged diameter section, the tractive end of steel strand (13) passes the axially extending bore and the moveable anchor assembly (6) in piston mandril (4) axle center, and bitten by moveable anchor assembly (6), a moveable anchor assembly (6) is bitten the tractive end of steel strand (13).When one or several piston mandril (4) moves to certain when limiting position to its larger diameter end direction, limit switch (9) is turned off power supply, and power hydraulic system (7) quits work.Between each hole on cylinder body (1) bottom, the end plates (2) and the piston mandril (4) and between end plates (2) and the cylinder body (1), all be equipped with poted assemblies (5).Cylinder body (1) rear end connects with backhaul oil cylinder (10) by screw thread or bolt.Cylinder body (1) front end has feet (8) to draw the device whole set to be supported on the work anchor slab of work anchor assembly (12) on cylinder body tops such as (1).The hydraulic medium of power hydraulic system (7) is that pressure chamber (11) communicates with the inner chamber of cylinder body (1), is shown the size of the interior hydraulic medium operation pressure of pressure chamber (11) at any time by compression indicator.

The pressure chamber (11) of power hydraulic system (7) in cylinder body (1) injects hydraulic medium.Because the effect of end plates (2), piston mandril (4), poted assemblies (5), hydraulic medium can not be outside pressure chamber (11) be introversive seepage, then operation pressure rises, hydraulic medium produces axial thrust to piston mandril (4), it is moved, jack-up moveable anchor assembly (6) to the larger diameter end direction.At this moment, as long as moveable anchor assembly (6) bitten steel strand (13), then the tractive end of steel strand (13) just with moveable anchor assembly (6) by piston mandril (4) jack-up.The tractive end of the steel strand (13) that the more loose pulling force of initial condition is less is at first moved by jack-up with moveable anchor assembly (6), and straining at the tractive end and the moveable anchor assembly (6) of the bigger steel strand of power (13), do not moved together initial condition by jack-up, increase along with the hydraulic medium operation pressure, hydraulic medium increases the axial thrust of piston mandril (4), the tractive end of the steel strand that initial tensile force is bigger (13) is with moveable anchor assembly (6), one by one by piston mandril (4) jack-up, until with the tractive end of all steel strand (13) in a branch of steel strand along with moveable anchor assembly (6) is moved by piston mandril (4) jack-up together.At this moment, the miles of relative movement different sizes of a plurality of piston mandrils (4) of device along axis direction drawn on the top, and be uneven, is asynchronous.Certainly, the situation that also can occur special coincidence sometimes, the initial condition that is all steel strand (13) in a branch of steel strand is just the same, and then each piston mandril (4) just may equate with the distance that moveable anchor assembly (6) cooperates jack-up steel strand (13) tractive end to be moved in the course of the work.Because the structure of piston mandril (4) is all identical with size, effective cross sectional area equates that then hydraulic medium promptly equates the tractive force of every steel strand (13) the axial thrust of piston mandril (4), power such as is.Sometimes the one stroke displacement of piston mandril (4) jack-up moveable anchor assembly (6) and steel strand (13) tractive end is big inadequately, the tension stress that is steel strand (13) does not reach required value, then need be under the cooperation of backhaul oil cylinder (10), feet (8) and work anchor assembly (12), carry out the repetition tension operation, till the tension stress with steel strand (13) reaches the rated value that engineering design requires.Repeat the how much relevant with the tightness of steel strand (13) initial condition, also relevant of work number of times with the stroke size of piston mandril (4).

Accompanying drawing drawing of the present utility model is described as follows:

Fig. 1 is the axial section that device is drawn on the asynchronous tops of power such as the many bars of this single cylinder.

Fig. 2 draws A-A transverse cross-sectional view among device Fig. 1 for this top.

The structure of drawing device referring to the represented asynchronous tops of power such as the many bars of single cylinder of attached Fig. 1 and 2, wherein: 1-cylinder body, 2-end plates, 3-plug screw baffle ring, 4-piston mandril, 5-poted assemblies, 6-moveable anchor assembly, the 7-power hydraulic system, 8-feet, 9-limit switch, 10-backhaul oil cylinder, the 11-pressure chamber, 12-work anchor assembly, 13-steel strand.

It is example that the utility model draws device with the top with seven piston mandrils, promptly as shown in Figure 1, 2.

The asynchronous tops of power such as the many bars of this single cylinder draw device to have the following advantages:

1, use this top to draw device to carry out the technology enforcement that prestressed anchor reinforcement is processed, can accurately control the size of every steel strand tension stress in the steel wire bundle, the tension stress of guaranteeing each root steel strand wires in the steel wire bundle all equates each other, can give full play to the usefulness of each root steel strand wires, greatly improve the quality of prestressed anchor reinforcement.

2, according to requirement of engineering, series of products can be set. Several at least, tens of the quantity of piston mandril, tens, up to a hundred at most; The total pulling force of a branch of steel strand wires is that the single hole anchor force can be by tens thousand of thousand Ns of thousands of oxen, tens of thousand Niu Zhizhi.

3, owing to can accurately control the tension stress of steel strand wires, indivedual steel strand wires overloadings can not occur, so use this top to draw device to carry out Contraction in Site, safe and reliable, progress is fast.

4, for some engineering item, be under the prerequisite of a determined value in total anchor force, can be by increasing the steel strand radical in a branch of steel strand, strengthen the total pulling force of a branch of steel strand, promptly strengthen the single hole anchor force,, save the funds spending of engineering to reduce the quantity of steel wire bundle.

6, this top draws device rational in infrastructure, and is easy to manufacture, easy to operate.

Claims

1, device is drawn on the asynchronous tops of power such as the many bars of a kind of single cylinder, by cylinder body, end plates, the plug screw baffle ring, piston mandril, poted assemblies, the moveable anchor assembly, power hydraulic system, feet, limit switch, compositions such as backhaul oil cylinder, it is characterized in that on cylinder body (1) bottom and end plates (2), having quantity to equate, the cooresponding each other axially extending bore in orientation, the through-hole aperture of cylinder body (1) bottom is less than the through-hole aperture on the end plates (2), identical in cylinder body (1) bottom with orientation on the end plates (2), cooresponding each other each in the big small through hole, each places the piston mandril (4) that an exterior contour that can move back and forth along axis direction is the stepped shaft shape, its reduced diameter section cooperates with the through hole of cylinder body (1) bottom, enlarged diameter section cooperates with through hole on the end plates (2), the distance that relatively moves of each piston mandril (4) can be unequal in the course of the work, also can equate.

2, device is drawn on the asynchronous top of power such as many bars of single cylinder as claimed in claim 1, it is characterized in that there is an axially extending bore in the axle center of each piston mandril (4).