CN201714101U

CN201714101U - Group anchor single-hole anchor withdrawing mechanism

Info

Publication number: CN201714101U
Application number: CN2010202692697U
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 group anchor single-hole anchor withdrawing mechanism. An anchor withdrawing main body is cylindrical and a clamping-piece withdrawing hole and a steel strand through hole are arranged along the axle, a clamping-piece leakage hole is opened on the middle wall of the anchor withdrawing main body and six support blocks are uniformly distributed along the cirumferential direction on the end surface of the anchor withdrawing main body near to the clamping-piece withdrawing hole and an inner concave arc groove is formed between two adjacent support blocks. When detaching the anchor, the inner concave arc groove is opposite to the anchored clamping-piece in the adjacent anchor hole to prevent interference with the clamping-piece in the adjacent anchor hole and six support blocks directly contact with the anchor plate and when the anchor withdrawing tool applies the pressure, the anchor withdrawing main body is stably strained and the strain is good and the safety is high; meanwhile, to prevent the anchor withdrawing main body from being damaged due to extrusion with the adjacent clamping-piece and the service life is prolonged and the use cost is reduced.

Description

Group's anchor single hole moves back the windlass structure

Technical field

The utility model relates to a kind of employed device when steel bar concrete is carried out carrying out removing anchorage device behind the prestressed stretch-draw, relates in particular to a population anchor single hole and moves back the windlass structure.

Background technology

In the existing prestressed stretch-draw process, no matter be single hole anchor or group anchor,, all need adopt the single hole limiting plate and move back the windlass structure stripped thread taking place or mending when opening.

In the prior art, the structure that single hole moves back the windlass structure as shown in Figure 1, moving back anchor body 1a is straight barrel structure, is provided with intermediate plate along axis and withdraws from hole 2a and steel strand perforation 3a, move back and have intermediate plate on the middle wall of anchor body 1a and spill hole 4a, intermediate plate spills hole 4a and withdraws from hole 2a with intermediate plate and communicate.

Use this single hole to move back the windlass structure and carry out ground tackle when removing, single hole moves back the structure of windlass structure under user mode as shown in Figures 2 and 3.Intermediate plate 7a withdraws from main dependence jack from anchor hole 8a power is provided, and single hole moves back the windlass structure and is installed between the outside of intermediate plate 7a and the piston of jack (not drawing among the figure).The steel strand 5a that passes is passed the steel strand perforation 3a that moves back anchor body 1a, pass the piston of jack again and be connected with jack, it is corresponding that intermediate plate 7a and intermediate plate withdraw from hole 2a, straight tube end is pressed in adjacent two anchor hole 8a on the intermediate plate 7a of anchoring, when the startup jack is exerted pressure, intermediate plate 7a withdraws from from anchor hole, after entering intermediate plate and withdrawing from hole 2a, spills hole 4a from intermediate plate and drops out.

The single hole of said structure moves back the windlass structure and in use mainly has following deficiency: one, single hole moves back the windlass structure and is straight tube, end face is pressed in adjacent two anchor hole 8a on the intermediate plate 7a of anchoring, single hole moves back the windlass structure and 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 to move back the skew of windlass structure frock, it is excessive to move back the anchor pulling force, and single hole moves back windlass structure unbalance stress, easily causes security incident; Two, single hole moves back the windlass structure when the intermediate plate 7a power transmission, and the hardness of intermediate plate 7a is moved back the hardness of windlass structure much larger than single hole, causes often being pressed with the end face of adjacent intermediate plate 7a extruding lacking, and well damage causes single hole to move back windlass structure turnover rate height, and use cost is higher.

Summary of the invention

At the prior art above shortcomings, the utility model provides a kind of and can avoid contacting with the intermediate plate of adjacent anchoring when moving back anchor, directly presses on the anchor slab, and frock is firm, non-migration, stressed evenly the life-span is long, and group's anchor single hole that use cost is low moves back the windlass structure.

Group's anchor single hole that the utility model provides moves back the windlass structure, and the described anchor body that moves back is a cylindrical structure, is provided with intermediate plate along axis and withdraws from hole and steel strand perforation, has intermediate plate on the described middle wall of moving back the anchor body and spills the hole, and described intermediate plate spills the hole and withdraws from the hole with intermediate plate and communicate; The described anchor body that moves back circumferentially is evenly equipped with six back-up blocks by the end face upper edge that intermediate plate withdraws from the hole, the interior circular diameter that described six back-up blocks surround is greater than 30mm, form the indent deep-slotted chip breaker between described 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 that moves back the anchor body, the center of circle line at the arc surface place of described indent deep-slotted chip breaker and the axial line distance of moving back the anchor body are less than 32.5mm, and the arc radius of described indent deep-slotted chip breaker is greater than 15mm.

Further, the cross-sectional profile profile of described back-up block is made of the circular arc line of three indents.

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

Compared with prior art, group's of the present utility model anchor single hole moves back the windlass structure and has following advantage:

1, the utility model circumferentially is evenly equipped with six back-up blocks in the end face upper edge of moving back the anchor body, the outside between adjacent two back-up blocks forms the indent deep-slotted chip breaker, during installation, make in indent deep-slotted chip breaker and the adjacent anchor hole the intermediate plate of anchoring for corresponding, 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, it is stressed firm to move back the anchor body, stressed good, safe.

2, simultaneously, also avoided moving back the anchor body when stressed and adjacent intermediate plate extruding taking place and causes moves back the anchor body and damage, prolonged application life, reduced use cost.

3, the cross-sectional profile profile of back-up block is made of the circular arc line of three indents, has both ensured the intensity of back-up block self, and is simultaneously easy to process, low cost of manufacture.

Description of drawings

Fig. 1 moves back the structural representation of windlass structure for single hole of the prior art;

Fig. 2 moves back the cross section view of windlass structure under user mode for single hole of the prior art;

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

Fig. 4 moves back the structural representation of windlass structure for group's anchor single hole of the present utility model;

Fig. 5 moves back the cross section view of windlass structure under user mode for group's anchor single hole of the present utility model;

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 that group's anchor single hole of the present utility model moves back the windlass structure, as shown in the figure.The anchor body 1 that moves back that group's anchor single hole moves back the windlass structure is cylindrical structure, is provided with intermediate plate along axis and withdraws from hole 2 and steel strand perforation 3, moves back to have intermediate plate on the middle wall of anchor body 1 and spill hole 4, and intermediate plate spills hole 4 and withdraws from hole 2 with intermediate plate and communicate.Move back anchor body 1 and circumferentially be evenly equipped with six back-up blocks 5 by the end face upper edge that intermediate plate withdraws from hole 2, the interior circular diameter that six back-up blocks surround is greater than 30mm, select for use greatlyyer, intermediate plate is moved freely in the interior circle that six back-up blocks surround, help intermediate plate and withdraw from than the diameter of existing intermediate plate.Form indent deep-slotted chip breaker 6 between adjacent two back-up blocks, the center of circle line at the arc surface place of indent deep-slotted chip breaker 6 is parallel with the axis that moves back anchor body 1, and center of circle line and the axial line distance of moving back anchor body 1 be less than 32.5mm, and the arc radius of indent deep-slotted chip breaker 6 is greater than 15mm.

The length of six back-up blocks 5 on the axial direction that moves back anchor 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 utilizing jack to remove intermediate plate, can guarantee to move back six back-up blocks 5 on the anchor body 1 and be stuck on the anchor slab between the intermediate plate in the adjacent in twos anchor hole with all the other ground tackles.If long because of the length of six back-up blocks 5, the distance that the anchor hole inner clamp piece withdraws from is long, and the elongation of steel strand increases when moving back anchor, and the cross section of steel strand diminishes, and formation fracture of wire or be completely cured easily causes security incident.

Steel bar concrete carries out after prestressing force pulls, and carries out intermediate plate or other ground tackle when removing, and at first will move back anchor body 1 and be installed between the piston (not drawing among the figure) of anchor slab 8 and jack, as shown in Figure 5 and Figure 6.Steel strand 7 are passed the steel strand perforation 3 of moving back on the anchor body 1, pass the piston of jack and be connected with jack.It is corresponding that intermediate plate 9 and intermediate plate in moving back anchor body 1 withdraw from hole 2, and six back-up blocks 5 are stuck on the anchor slab 8 between the intermediate plate 9 in the adjacent in twos anchor hole 10.When the startup jack carried out intermediate plate 9 and the dismounting of other ground tackle, the piston rod of jack was pressed in the other end of moving back anchor body 1, moves back anchor body 1 and directly power is passed to anchor slab 8 by six back-up blocks 5 on it.Steel strand 7 tensions in the anchor hole 10 drive intermediate plate 9 and withdraw from anchor hole 10, and intermediate plate 9 enters intermediate plate and withdraws from the hole 2, and spill the hole 4 from intermediate plate and to spill, and reach the purpose of removing intermediate plate 9.

Because six back-up blocks 5 have been avoided the intermediate plate position in the adjacent anchor hole 10 fully, form six positions of annular and contact with anchor slab 8, both stressed even, do not disturb other anchor hole to realize normal single hole stretch-draw again.Constant all the time because of the center to center distance of each anchor hole and adjacent anchor hole, so moving back the windlass structure, this group anchor single hole is applicable to that any one anchor hole removes.

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. a population anchor single hole moves back the windlass structure, the described anchor body (1) that moves back is a cylindrical structure, be provided with intermediate plate along axis and withdraw from hole (2) and steel strand perforation (3), have intermediate plate on the described middle wall of moving back anchor body (1) and spill hole (4), described intermediate plate spills hole (4) and withdraws from hole (2) with intermediate plate and communicate; It is characterized in that: the described anchor body (1) that moves back circumferentially is evenly equipped with six back-up blocks (5) by the end face upper edge that intermediate plate withdraws from hole (2), the interior circular diameter that described six back-up blocks (5) surround is greater than 30mm, form indent deep-slotted chip breaker (6) between described adjacent two back-up blocks (5), the center of circle line at the arc surface place of described indent deep-slotted chip breaker (6) is parallel with the axis that moves back anchor body (1), the center of circle line at the arc surface place of described indent deep-slotted chip breaker (6) and the axial line distance of moving back anchor body (1) are less than 32.5mm, and the arc radius of described indent deep-slotted chip breaker (6) is greater than 15mm.

2. group's anchor single hole according to claim 1 moves back the windlass structure, and it is characterized in that: the cross-sectional profile profile of described back-up block (5) is made of the circular arc line of three indents.

3. group's according to claim 2 anchor single hole moves back the windlass structure, it is characterized in that: the length of described six back-up blocks (5) on the described axial direction that moves back anchor body (1) is 9～12mm.