CN102296975B

CN102296975B - Anchor pre-tensioning device

Info

Publication number: CN102296975B
Application number: CN201110213359.3A
Authority: CN
Inventors: 李树清; 孙雪峰; 王卫军; 余伟健; 李青锋
Original assignee: Hunan University of Science and Technology
Current assignee: Hunan University of Science and Technology
Priority date: 2011-07-28
Filing date: 2011-07-28
Publication date: 2014-04-23
Anticipated expiration: 2031-07-28
Also published as: CN102296975A

Abstract

The invention relates to a bolt-prestressing device, which comprises a bolt (1), a tray (2), a bolt nut (3), a screwing nut (4), a three-leg support (5) and a friction reducer (6), the bolt (1) passes through the central axial hole of the tray (2) and is fixed on a laneway wall, one surface of the tray (2) props the laneway wall, the other surface of the tray (2) clings to the bolt nut (3) sleeved on the bolt (1), the friction reducer (6) comprises an outer shim plate, an inner shim plate and a plurality of balls, one surface of the inner shim plate is in tight contact with the screwing nut (4), the inner shim plate and the balls can be fixedly connected together, or the balls can roll in corresponding ball sockets arranged on the inner shim plate and the outer shim plate. The bolt-prestressing device can effectively solve the phenomenon that bolt-prestressing force is insufficient, and moreover, the bolt-prestressing device is easy to operate, and can be dismounted for reuse after use.

Description

Anchor rod pretightening device

Technical field:

The present invention relates to a kind of pre-tightening apparatus, refer in particular under ore deposit and use anchor rod pretightening device.

Background technology:

Under ore deposit, operation can adopt anchor pole to maintain stability and the safety in tunnel under ore deposit mostly at present, but because the pressure between the piece of tunnel is often very large, for improving Effects of Supporting, need to when rockbolt installation, to it, apply certain pretightning force, and it be fixed with pallet and nut.Generally, the pretightning force that adopts torque wrench or jumbolter clamp nut to apply is less, is difficult to engineering demands.

The Main Means that improves at present bolt pretension has: 1. between anchor nut and pallet, lay antifriction packing ring, so that rockbolt installation moment of torsion is converted into bolt pretension to a greater degree, but the amplitude of which raising bolt pretension is little; 2. use hydraulic tensioning device stretching anchor rod to improve bolt pretension, although which effect is better, have the deficiencies such as work progress complexity, anchor pole revealed section be long.

Summary of the invention:

For making by anchor pole and pallet nut being fixed between the piece of different tunnels tightly, make fixing more firm between the piece of tunnel, the present invention adopts following technical scheme to implement: a kind of anchor rod pretightening device, comprise anchor pole, pallet, anchor nut, anchor pole is fixed in wall through the center line axis hole of pallet, the one side of pallet is withstood wall, the another side of pallet is close to the anchor nut that is enclosed within anchor pole, it is characterized in that: it also includes twisting nut, three leg supports and antifriction device, the direction of inserting wall take anchor pole is as benchmark, twisting nut, antifriction device, three leg supports are sleeved on anchor pole successively by its central shaft hole successively, wherein: described antifriction device is fixed on one end of three leg supports, the three leg support other ends are annulus end, this annulus end withstands pallet, and in annulus end, ring is greater than the cross-sectional area of anchor nut, described antifriction device comprises outer backing plate, interior backing plate and multiple ball, interior backing plate and ball are connected, the corresponding ball of outer backing plate is provided with annular groove and rolls for ball, the another side of interior backing plate and twisting nut close contact.During work, twisting nut is moving toward wall direction along anchor pole under the ordering about of external force, and then in compressing, backing plate drives ball to roll in annular groove, by three leg supports, pallet is exerted pressure, while is the outer anchor pole that draws also, now utilize spanner or other instruments to tighten anchor nut, under identical dynamics this to tighten degree more firm, effectively raise bolt pretension.

Further, affiliated ball is arranged to on-fixed with interior backing plate to be connected, but on interior backing plate with half corresponding annular groove is set on outer backing plate simultaneously, and on backing plate, retainer is set outside, retainer guarantees the stability that ball rolls in annular groove.Owing to being no longer the relation being fixedly connected with between ball and interior backing plate, be provided with again the stability that retainer keeps ball to roll simultaneously, the frictional force that ball is subject to when rolling is less, thereby the more effective torque forces by twisting nut is effectively converted into the pressure to pallet and the pulling force to anchor pole, has further improved bolt pretension.

The present invention is simple in structure, for convenience detach, for ease of maintenaince.After having completed the pretension of anchor rod pallet board, unloaded the pretension for next anchor rod pallet board, can realize recycling.

Accompanying drawing explanation:

Fig. 1 is self-contained structural representation;

Fig. 2 is antifriction device cross-sectional structure schematic diagram;

Fig. 3 is structural representation between ball and upper and lower pad.

Specific embodiment:

Below in conjunction with drawings and Examples the present invention is further elaborated explanation: the anchor rod pretightening device of the present embodiment, comprise anchor pole 1, pallet 2, anchor nut 3, anchor pole 1 is fixed in wall through the center line axis hole of pallet 2, the one side of pallet 2 is withstood wall, the another side of pallet 2 is close to the anchor nut 3 that is enclosed within anchor pole 1, it is characterized in that: it also includes twisting nut 4, three leg supports 5 and antifriction device 6, the direction of inserting wall take anchor pole 1 is benchmark, twisting nut 4, antifriction device 6, three leg supports 5 are sleeved on anchor pole 1 successively by its central shaft hole successively, wherein: described antifriction device 6 is fixed on one end of three leg supports 5, three leg support 5 other ends are annulus end 7, this annulus end 7 withstands pallet 2, and the interior ring of annulus end 7 is greater than the cross-sectional area of anchor nut 3, described antifriction device 6 comprises outer backing plate 61, interior backing plate 62 and multiple ball 63, on interior backing plate 62 with on outer backing plate 61, corresponding annular groove 64 is set simultaneously, and on backing plate 61, retainer 65 is set outside, retainer 65 guarantees the stability that ball rolls in annular groove 64, the another side of interior backing plate 62 and twisting nut 4 close contact.During work, twisting nut is moving toward wall direction along anchor pole under the ordering about of external force, and then in compressing, backing plate drives ball to roll in annular groove, by three leg supports, pallet is exerted pressure, while is the outer anchor pole that draws also, now utilize spanner or other instruments to tighten anchor nut, under identical dynamics this to tighten degree more firm, effectively raise bolt pretension.

Certainly, the above is only a kind of specific embodiment of the present invention, relation between ball and interior backing plate can also arrange multiple, for example ball is embedded in interior backing plate, or each ball is arranged to a little axle through its center, the same number of ball grooves of number and ball is set on interior backing plate, on ball grooves, digging two aperture work ball central axis two ends penetrates, all can reach equally with above embodiment much the same effect, no matter adopt which kind of setting, as long as the equivalents of doing in the present invention's spirit scope, all will be in protection domain of the present invention.

Claims

1. an anchor rod pretightening device, comprise anchor pole (1), pallet (2), anchor nut (3), anchor pole (1) is fixed in wall through the center line axis hole of pallet (2), the one side of pallet (2) is withstood wall, the another side of pallet (2) is close to the anchor nut (3) that is enclosed within anchor pole (1), it is characterized in that: it also includes twisting nut (4), three leg supports (5) and antifriction device (6), the direction of inserting wall take anchor pole (1) is as benchmark, twisting nut (4), antifriction device (6), three leg supports (5) are sleeved on anchor pole (1) successively by its central shaft hole successively, wherein: described antifriction device (6) is fixed on one end of three leg supports (5), three leg supports (5) other end is annulus end (7), this annulus end (7) withstands pallet (2), and in annulus end (7), ring is greater than the cross-sectional area of anchor nut (3), described antifriction device (6) comprises outer backing plate (61), interior backing plate (62) and multiple ball (63), interior backing plate (62) is connected with ball (63), the corresponding ball of outer backing plate (61) (63) locates to be provided with annular groove (64), the another side of interior backing plate (62) and twisting nut (4) close contact.

2. according to anchor rod pretightening device claimed in claim 1, it is characterized in that: described ball (63) is connected with interior backing plate (62) on-fixed, but above with on outer backing plate (61), half corresponding annular groove is set simultaneously at interior backing plate (62), and on backing plate (61), retainer (65) is set outside, retainer (65) guarantees the stability that ball rolls in annular groove (64).