CN217266960U

CN217266960U - Tensioning construction tool for prestressed steel strand of nonlinear prestressed pipeline

Info

Publication number: CN217266960U
Application number: CN202220856673.7U
Authority: CN
Inventors: 刘继伟; 张耀阳; 陈景磊; 祁海强
Original assignee: CCCC SHB Fourth Engineering Co Ltd
Current assignee: CCCC SHB Fourth Engineering Co Ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-08-23
Anticipated expiration: 2032-04-14

Abstract

The utility model belongs to bridge beam slab construction field relates to a nonlinear line prestressing force pipeline prestressing force stranded wire stretch-draw construction frock. The tensioning construction tool for the non-linear prestressed pipeline prestressed steel strand is provided with a through jack; a plurality of jack push rods are arranged in the cylinder body of the through jack; each jack mandril is of a hollow structure; an inner sliding rod for penetrating a steel strand is arranged in each jack mandril; the inner sliding rod is in clearance fit with the jack mandril; the lower end of the inner sliding rod is connected with a jack bottom plate at the bottom of the piercing jack; the steel strand penetrates out of the middle of the inner slide rod and is locked with the working anchor and the clamping piece on the ejector rod to form a whole; the cylinder wall of the penetrating jack is provided with an oil hole; and a plurality of jack mandrils are connected in series in the oil pressure system. The utility model discloses realize that every ejector pin possess the same jacking force, can monitor whether the every steel strand wires atress condition meets the requirements, avoid the too big or not enough condition of tension, ensure the stretch-draw quality.

Description

Tensioning construction tool for prestressed steel strand of nonlinear prestressed pipeline

Technical Field

The utility model belongs to bridge beam slab construction field relates to bridge superstructure post-tensioned nonlinear prestressed pipeline, prestressing steel strand wires stretch-draw construction technique, concretely relates to nonlinear prestressed pipeline prestressing steel strand wires stretch-draw construction frock.

Background

At present, in the prestressed tensioning construction of the post-tensioning method of the bridge superstructure, a bundle of steel strands share one tool anchorage regardless of the number of the steel strands, as shown in figure 1, the tensioning schematic diagram of the tool anchorage of the traditional punching jack is shown, and when the jack is tensioned, particularly for a curved pipeline, the final elongation of the steel strands is the same, so that the result is as follows: the final tension only represents the sum of all the tension of the steel strands, and the tension borne by each steel strand is different, so that the individual stress condition of each steel strand cannot be reflected; if the control is improper, one steel strand in the same bundle of steel strands is over-tensioned, and correspondingly, the condition that the tension of one steel strand is insufficient exists.

Based on the current mechanical automation and high quality and high standard requirements, a new device which is more advanced, more accurate and safer than the traditional jack tensioning is urgently needed.

SUMMERY OF THE UTILITY MODEL

The prestressing force inequality problem between every single with restraint steel strand wires in order to solve bridge beam slab post-tensioning method, the utility model aims at providing a non-linear prestressing force pipeline prestressing force steel strand wires stretch-draw construction frock.

The utility model adopts the following technical scheme for accomplishing the above purpose:

a non-linear prestressed pipeline prestressed steel strand tensioning construction tool is provided with a through jack; a plurality of jack push rods are arranged in the cylinder body of the center-penetrating jack; each jack mandril is of a hollow structure; an inner sliding rod for penetrating a steel strand is arranged in each jack mandril; the inner sliding rod is in clearance fit with the jack mandril; the lower end of the inner sliding rod is connected with a jack bottom plate at the bottom of the piercing jack; the steel strand penetrates out of the middle of the inner sliding rod and is locked with the working anchor and the clamping piece on the ejector rod to form a whole; the cylinder wall of the penetrating jack is provided with an oil hole; a plurality of jack ejector pins are connected in series in an oil pressure system, the oil quantity in the hydraulic cylinder is controlled through the oil holes, the jack ejector pins are pressed out of the cylinder body through increasing the oil pressure, and the steel strand stretching is completed.

The lower end of the inner sliding rod is provided with external threads which correspond to the threaded holes in the bottom plate of the jack one by one.

The utility model provides a pair of non-straight line prestressing force pipeline prestressing force steel strand stretching construction frock adopts the novel jack-through of a jar multi-top, one set of hydraulic system of a plurality of jack ejector pins sharing in same cylinder body, under the same hydraulic pressure force's the condition, and the lifting surface area of every ejector pin bottom is the same, every telescopic link and ground tackle are all independent, thereby realize that every ejector pin has the same apical force, can monitor whether the every steel strand wires atress condition meets the demands, avoid the too big or not enough condition of tension, ensure the tensioning quality.

Drawings

Fig. 1 is a schematic drawing of anchor tensioning of a conventional through-center jack tool.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3-6 are exploded views of the components of the center-piercing jack of the present invention.

Fig. 7 is a diagram of the assembled finished product of the piercing jack of the present invention.

In the figure: 1. the cylinder body, 2, a tool anchor, 3, a clamping piece, 4, a steel strand, 5, a jack ejector rod, 6, an oil hole, 7, a cylinder top sealing ring, 8, an ejector rod bottom sealing ring, 9, an inner slide rod top sealing ring, 10, an inner slide rod, 11, an inner slide rod bottom nut, 12, a bottom plate sealing gasket, 13, an inner slide rod bottom sealing gasket, 14, a jack bottom plate, 15, a jack bottom plate bolt hole, 16, a bolt hole, 17, a jack connecting bolt, 18, an ejector rod bottom sealing ring groove, 19, an inner slide rod top sealing ring groove, 20 and a cylinder top sealing ring groove.

Detailed Description

The invention will be described in detail with reference to the accompanying drawings and specific embodiments:

as shown in fig. 2, and with reference to fig. 3-6, a non-linear prestressed pipeline prestressed steel strand tensioning construction tool is provided with a through jack; seven jack mandrils 5 are arranged in the cylinder body 1 of the center-penetrating jack; each jack mandril is of a hollow structure; an inner sliding rod 10 for penetrating the steel strand 4 is arranged in each jack mandril; the inner slide rod 10 is in clearance fit with the jack mandril 5; the lower end of the inner sliding rod 10 is connected with a jack bottom plate 14 at the bottom of the piercing jack; the steel strand 4 penetrates out of the middle of the inner slide rod 10 and is locked with the working anchor 2 and the clamping piece 3 on the ejector rod to form a whole; an oil hole 6 is formed in the wall of the cylinder body 1 of the through jack; a plurality of jack ejector pins are connected in series in an oil pressure system, the oil quantity in the hydraulic cylinder is controlled through the oil holes, the jack ejector pins are pressed out of the cylinder body through increasing the oil pressure, and the steel strand stretching is completed.

The lower end of the inner sliding rod 10 is provided with external threads which correspond to the threaded holes 16 on the bottom plate of the jack one by one.

With reference to fig. 3-6 and fig. 7, the installation process of the present invention is as follows:

(1) firstly, a cylinder top sealing ring 7 is arranged in a cylinder top sealing ring groove 20, an inner slide rod top sealing ring 9 is arranged in an inner slide rod top sealing ring groove 19, and an ejector rod bottom sealing ring 8 is arranged in an ejector rod bottom sealing ring groove 18;

(2) installing the jack cylinder 1 and the bottom plate sealing gasket 12 on the jack bottom plate 14;

(3) the inner sliding rod is inserted into the jack mandril 5 through a hole 10;

(4) placing a sealing gasket 13 at the bottom of the inner slide bar into the bottom of the inner slide bar bolt hole 16 of the bottom plate of the jack;

(5) screwing a nut at the bottom of the inner sliding rod 10 into an inner sliding rod bolt hole 16 of a bottom plate of the jack;

(6) installing a cylinder body 1 of the jack corresponding to the position of a jack mandril 5;

(7) screwing a jack connecting bolt 17 into a jack bottom plate bolt hole 15; the jacks are connected into a whole.

The jack controls the oil quantity in the hydraulic cylinder through the oil hole, and seven jack rod telescopic pipelines in the jack cylinder body are connected in series in an oil pressure system through a groove in the middle of a jack bottom plate; the steel strand penetrates out of the middle of the inner sliding rod, is locked with the working anchor and the clamping piece on the ejector rod to form a whole, and the jack ejector rod is pressed out of the cylinder body by increasing oil pressure to complete the stretching of the steel strand.

Finally, it is noted that the above preferred embodiments have been given by way of illustration and not limitation, and that while the invention has been described in detail with reference to the preferred embodiments described above, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a non-linear prestressing force pipeline prestressing force steel strand stretching construction frock which characterized in that: the steel strand tensioning construction tool is provided with a through jack; a plurality of jack push rods are arranged in the cylinder body of the center-penetrating jack; each jack mandril is of a hollow structure; an inner sliding rod for penetrating a steel strand is arranged in each jack mandril; the inner sliding rod is in clearance fit with the jack mandril; the lower end of the inner sliding rod is connected with a jack bottom plate at the bottom of the piercing jack; the steel strand penetrates out of the middle of the inner sliding rod and is locked with the working anchor and the clamping piece on the ejector rod to form a whole; the cylinder wall of the penetrating jack is provided with an oil hole; a plurality of jack ejector rods are connected in series in the oil pressure system, the oil quantity in the hydraulic cylinder is controlled through the oil holes, the jack ejector rods are pressed out of the cylinder body through increasing the oil pressure, and the steel strand tensioning is completed.

2. The non-linear prestressed pipeline prestressed steel strand tensioning construction tool of claim 1, characterized in that: the lower end of the inner sliding rod is provided with external threads which correspond to the threaded holes in the bottom plate of the jack one by one.