CN201714100U

CN201714100U - Tensile group anchor mono-hole limitator

Info

Publication number: CN201714100U
Application number: CN2010202692682U
Authority: CN
Inventors: 陈国民
Original assignee: China Metallurgical Group Corp
Current assignee: China Metallurgical Group Corp
Priority date: 2010-07-23
Filing date: 2010-07-23
Publication date: 2011-01-19
Anticipated expiration: 2020-07-23

Abstract

The utility model discloses a tensile group anchor mono-hole limitator. The limitator body is of a cylindrical structure and is provided with strand wire through holes along the axis line; one end surface of the limitator body is provided with six supporting blocks along the circumferential direction; the diameter of the internal round formed by the enclosing of six supporting blocks is greater than 30mm; the external side between two adjacent supporting blocks forms an internal concave arc-shaped trough; the circle center line at which the arc surface of the internal concave arc-shaped trough is arranged is arranged in parallel with the axis line of the limitator body and the distance between the two lines is less than 32.5mm; and the arc radius of the internal concave arc-shaped trough is more than 15mm. During the assembling process, the internal concave arc-shaped trough corresponds to a clip anchored in the adjacent anchor hole, thus avoiding the interference with the clips in the adjacent anchor holes; the six supporting blocks are completely supported on the anchor plate and directly apply the pressure on the anchor plate; the limitator body bears the force steadily and has good load bearing performance and high safety performance; simultaneously the damage of the limitator body is avoided caused by the extrusion between the limitator and the adjacent clips under stress; the service life is prolonged, and the usage cost is reduced.

Description

Stretch-draw group anchor single hole stop

Technical field

The utility model relates to a kind of employed device when steel bar concrete is carried out prestressed stretch-draw, relates in particular to a kind of stretch-draw group anchor single hole stop.

Background technology

[0002] in the existing prestressed stretch-draw process, no matter is single hole anchor or group anchor,, all need adopts single hole stop and anchor restorer stripped thread taking place or mending when opening.

In the prior art, the structure of single hole stop as shown in Figure 1, stop body 1a cuts away a part by cylinder along its axial direction symmetry and forms, along axis steel strand perforation 2a is set, one end face is provided with the arc back-up block 3a of a symmetry, and two arc back-up block 3a and end face form indent stopper slot 4a.

When using this single hole stop to carry out steel bar concrete construction pre-stress stretching, mounting structure as shown in Figures 2 and 3.Steel strand 5a passes anchor slab 6a, adopts three intermediate plate 7a to be clipped on the steel strand 5a, and intermediate plate 7a is inserted in the anchor hole 8a from the heavy caliber end of the anchor hole 8a of anchor slab 6a.Because the cylindrical of intermediate plate 7a and the endoporus of anchor hole 8a are the pyramidal structure that matches and use, steel strand 5a moves the realization prestressed stretch-draw to the heavy caliber end of anchor hole 8a, and intermediate plate 7a tightened steel strand 5a when steel strand 5a moved to the small-caliber end of anchor hole 8a.Apply prestressed stretch-draw and realize by jack, for the piston that makes jack can be pressed on the anchor slab 6a, simultaneously also in order to prevent that intermediate plate 7a from withdrawing from from anchor hole 8a, therefore must be between the piston of the outside of intermediate plate 7a and jack installation single hole stop.The steel strand 5a that passes is passed steel strand perforation 2a on the stop body 1a, intermediate plate 7a is relative with indent stopper slot 4a, and be limited in the indent stopper slot 4a, again steel strand 5a is passed the piston of jack and be connected with jack, start the jack pair steel bar concrete and carry out prestressed stretch-draw.

In use mainly there is following deficiency in the single hole stop of said structure: when one, the jack pair steel bar concrete carries out prestressed stretch-draw, two arc back-up block 3a of single hole stop are pressed in respectively in adjacent two anchor hole 8a on the intermediate plate 7a of anchoring, the single hole stop can only press on the anchor slab 6a by intermediate plate 7a, and can not directly press on the anchor slab 6a, cause single hole stop frock not in place, the arc back-up block 3a unbalance stress of two symmetries easily causes security incident; When two, the single hole stop is by intermediate plate 7a power transmission, the hardness of intermediate plate 7a causes often being lacked well damage by pressure with two arc back-up block 3a of adjacent intermediate plate 7a extruding much larger than the hardness of single hole stop, cause single hole stop turnover rate height, use cost is higher.

Summary of the invention

At the prior art above shortcomings, when providing a kind of prestressed stretch-draw, the utility model can avoid contacting with the intermediate plate of adjacent anchoring, directly press on the anchor slab, and frock puts in place, stressed even, the life-span is long, the stretch-draw group anchor single hole stop that use cost is low.

The stretch-draw group anchor single hole stop that the utility model provides, described stop body is a cylindrical structure, along axis the steel strand perforation is set, end face upper edge at described stop body circumferentially is evenly equipped with six back-up blocks, the interior circular diameter that described six back-up blocks surround is greater than 30mm, form the indent deep-slotted chip breaker between adjacent two back-up blocks, the center of circle line at the arc surface place of described indent deep-slotted chip breaker is parallel with the axis of stop body, the center of circle line at the arc surface place of described indent deep-slotted chip breaker and the axial line distance of stop body are less than 32.5mm, and the arc radius of described indent deep-slotted chip breaker is greater than 15mm.

Further, the length of described six back-up blocks on the axial direction of described stop body is 9～12mm.

Compared with prior art, stretch-draw group anchor single hole stop of the present utility model has following advantage:

1, the utility model circumferentially is evenly equipped with six back-up blocks in the end face upper edge of stop body, the outside between adjacent two back-up blocks forms the indent deep-slotted chip breaker, during installation, make that the intermediate plate of anchoring is corresponding in indent deep-slotted chip breaker and the adjacent anchor hole, avoid with adjacent anchor hole in intermediate plate disturb, six back-up blocks can be supported on the anchor slab and to anchor slab fully directly exerts pressure, the stop body is stressed firm, stressed good, safe.

2, simultaneously, when also having avoided the stop body stressed and extruding takes place adjacent intermediate plate and cause the stop body to damage, prolong application life, reduced use cost.

Description of drawings

Fig. 1 is the structural representation of single hole stop of the prior art;

Fig. 2 is the cross section view of single hole stop of the prior art under user mode;

Fig. 3 is along the cross section view of A-A direction among Fig. 2;

Fig. 4 is the structural representation of stretch-draw group anchor single hole stop of the present utility model;

Fig. 5 is the cross section view of stretch-draw group anchor single hole stop of the present utility model under user mode;

Fig. 6 is along the cross section view of B-B direction among Fig. 5.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done to describe in further detail.

Fig. 4 is the structural representation of stretch-draw group anchor single hole stop of the present utility model, as shown in the figure.The stop body 1 of stretch-draw group anchor single hole stop is a cylindrical structure, along axis steel strand perforation 2 is set, circumferentially uniform in an end face upper edge of described stop body 1 six back-up blocks 3 are set, the interior circular diameter that six back-up blocks 3 surround is greater than 30mm, select for use greatlyyer, intermediate plate is moved freely in the interior circle that six back-up blocks surround than the diameter of existing intermediate plate.Form indent deep-slotted chip breaker 4 between adjacent two back-up blocks 3, the center of circle line at the arc surface place of indent deep-slotted chip breaker 4 is parallel with the axis of stop body 1, and the axial line distance of center of circle line and stop body 1 is less than 32.5mm, and the arc radius of described indent deep-slotted chip breaker 4 is greater than 15mm.

The length of six back-up blocks 3 on the axial direction of stop body 1 is 9～12mm, with regard to existing intermediate plate, after intermediate plate clamps the anchor hole of steel strand insertion anchor slab, stays the outer length of anchor slab end face greatly about about 6mm.When the jack pair steel bar concrete carries out prestressed stretch-draw, steel strand are to jack one side shifting, intermediate plate withdraws from along the anchor hole position, position-limiting action because of stop body 1, intermediate plate can only move in the length range of 3～6mm, both prevented that intermediate plate from withdrawing from fully in anchor hole, do not influenced steel strand again and move to the jack direction.

Intermediate plate is generally the arc of pyramidal structure, and the diameter of big end is 30mm, and the interior circular diameter that six back-up blocks 3 surround is greater than 30mm, and less than 38mm.So neither hinder intermediate plate in the interior circle that six back-up blocks 3 surround, to move, also make six back-up blocks 3 self have enough intensity simultaneously.

When using this stretch-draw group anchor single hole stop to carry out steel bar concrete construction pre-stress stretching, at first the stop body is installed between the piston (not drawing among the figure) of anchor slab 6 and jack, as shown in Figure 5 and Figure 6.Steel strand 5 pass the anchor hole 8 of anchor slab 6, adopt three intermediate plates 7 to be clipped in steel strand 5, and the heavy caliber end of intermediate plate 7 from the anchor hole 8 of anchor slab 6 inserted in the anchor hole 8.Again steel strand 5 are passed the steel strand perforation 2 of stop body 1, pass the piston of jack and be connected with jack.The interior circle that intermediate plate 7 and six back-up blocks 2 are surrounded is corresponding, and six back-up blocks 2 are stuck on the anchor slab 6 between the interior intermediate plate of adjacent in twos anchor hole.When startup jack pair steel bar concrete carried out prestressed stretch-draw, the piston rod of jack was pressed in the other end of stop body 1, and stop body 1 directly passes to power anchor slab 6 by six back-up blocks 3 on it.

Because six back-up blocks 3 have been avoided the intermediate plate position in the adjacent anchor hole fully, form six positions of annular and contact with anchor slab 6, both stressed evenly, do not disturb other anchor hole to realize normal single hole stretch-draw again.Because of the center to center distance of each anchor hole and adjacent anchor hole constant all the time, so this stretch-draw group anchor single hole stop is applicable to that any one anchor hole carries out frock.

Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. stretch-draw group anchor single hole stop, described stop body (1) is a cylindrical structure, along axis steel strand perforation (2) are set, it is characterized in that: the end face upper edge at described stop body (1) circumferentially is evenly equipped with six back-up blocks (3), the interior circular diameter that described six back-up blocks (3) surround is greater than 30mm, form indent deep-slotted chip breaker (4) between adjacent two back-up blocks (3), the center of circle line at the arc surface place of described indent deep-slotted chip breaker (4) is parallel with the axis of stop body (1), the axial line distance of the center of circle line at the arc surface place of described indent deep-slotted chip breaker (4) and stop body (1) is less than 32.5mm, and the arc radius of described indent deep-slotted chip breaker (4) is greater than 15mm.

2. stretch-draw group anchor single hole stop according to claim 1, it is characterized in that: the length of described six back-up blocks (3) on the axial direction of described stop body (1) is 9～12mm.