CN102296975A

CN102296975A - Bolt-prestressing device

Info

Publication number: CN102296975A
Application number: CN2011102133593A
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: 2011-12-28
Anticipated expiration: 2031-07-28
Also published as: CN102296975B

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

The anchor pole pre-tightening apparatus

Technical field:

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

Background technology:

Operation can adopt anchor pole to keep the stability and the safety in tunnel under the ore deposit mostly under the ore deposit at present, but because the pressure between the piece of tunnel is often very big, for improving the bolt support effect, need when anchor pole is installed, apply certain pretightning force, and it be fixed with pallet and nut to it.Generally speaking, the pretightning force that adopts torque wrench or jumbolter clamp nut to apply is less, is difficult to engineering demands.

The main means that improve at present bolt pretension have: 1. lay the antifriction packing ring between anchor nut and pallet, so that the anchor pole mounting torque is converted into bolt pretension to a greater degree, but that this mode improves the amplitude of bolt pretension is little; 2. use hydraulic tensioning device stretching anchor rod to improve bolt pretension,, exist work progress complexity, anchor pole revealed section than deficiencies such as length though this mode effect is better.

Summary of the invention:

For making by anchor pole and pallet with 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 pole pre-tightening apparatus, comprise anchor pole, pallet, anchor nut, the center line axis hole that anchor pole passes pallet is fixed on the wall, 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 the twisting nut, three leg supports and antifriction device, the direction of inserting wall with anchor pole is a benchmark, the twisting nut, antifriction device, three leg supports are sleeved on the anchor pole by its central shaft hole successively successively, wherein: described antifriction device is fixed in an end of three leg supports, the three leg support other ends are the annulus end, this annulus end withstands pallet, and ring is greater than the cross-sectional area of anchor nut in the annulus end, described antifriction device comprises outer backing plate, interior backing plate and a plurality of 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, the twisting nut is moving along anchor pole toward the wall direction under the ordering about of external force, and then backing plate drive ball rolls in annular groove in compressing, by three leg supports pallet is exerted pressure, the also outer simultaneously anchor pole that draws, utilize spanner or other instruments that anchor nut is tightened this moment, then 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 on the outer backing plate, corresponding half annular groove is set simultaneously, and on the backing plate retainer is set outside, the stability that retainer assurance ball rolls in annular groove.Because between ball and the interior backing plate no longer is the relation of fixedlying connected, be provided with simultaneously the stability that retainer keeps ball to roll again, the frictional force that makes ball be subjected to when rolling is littler, thereby the more effective torque forces that will twist nut effectively is converted into to the pressure of pallet with to the pulling force of anchor pole, has further improved bolt pretension.

The present invention is simple in structure, and is for convenience detach, for ease of maintenaince.After the pretension of having finished the anchor pole pallet, it is unloaded the pretension that is used for next anchor pole pallet, can realize recycling.

Description of drawings:

Fig. 1 is self-contained structural representation;

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

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

Specific embodiment:

Below in conjunction with drawings and Examples the present invention is further elaborated the explanation: the anchor pole pre-tightening apparatus of present embodiment, comprise anchor pole 1, pallet 2, anchor nut 3, the center line axis hole that anchor pole 1 passes pallet 2 is fixed on the wall, 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 with anchor pole 1 is a benchmark, twisting nut 4, antifriction device 6, three leg supports 5 are sleeved on the anchor pole 1 successively by its central shaft hole successively, wherein: described antifriction device 6 is fixed in an end of three leg supports 5, three leg supports, 5 other ends are annulus end 7, this annulus end 7 withstands pallet 2, and ring is greater than the cross-sectional area of anchor nut 3 in the annulus end 7, described antifriction device 6 comprises outer backing plate 61, interior backing plate 62 and a plurality of ball 63, on interior backing plate 62 with outside corresponding annular groove 64 is set simultaneously on the backing plate 61, and on the 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, the twisting nut is moving along anchor pole toward the wall direction under the ordering about of external force, and then backing plate drive ball rolls in annular groove in compressing, by three leg supports pallet is exerted pressure, the also outer simultaneously anchor pole that draws, utilize spanner or other instruments that anchor nut is tightened this moment, then under identical dynamics this to tighten degree more firm, effectively raise bolt pretension.

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

Claims

1. anchor pole pre-tightening apparatus, comprise anchor pole (1), pallet (2), anchor nut (3), the center line axis hole that anchor pole (1) passes pallet (2) is fixed on the wall, 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 with anchor pole (1) is a benchmark, twisting nut (4), antifriction device (6), three leg supports (5) are sleeved on the anchor pole (1) successively by its central shaft hole successively, wherein: described antifriction device (6) is fixed in an end of three leg supports (5), three leg supports (5) other end is annulus end (7), this annulus end (7) withstands pallet (2), and ring is greater than the cross-sectional area of anchor nut (3) in the annulus end (7), described antifriction device (6) comprises outer backing plate (61), interior backing plate (62) and a plurality of ball (63), interior backing plate (62) is connected with ball (63), the corresponding ball of outer backing plate (61) (63) is provided with annular groove (64) and rolls for ball (63), the another side of interior backing plate (62) and twisting nut (4) close contact.

2. according to the described anchor pole pre-tightening apparatus of claim 1, it is characterized in that: described ball (63) is connected with interior backing plate (62) on-fixed, but interior backing plate (62) go up with outside corresponding half annular groove is set simultaneously on the backing plate (61), and on the backing plate (61) retainer (65) is set outside, retainer (65) guarantees the stability that ball rolls in annular groove (64).