CN2278083Y

CN2278083Y - High-strength metal anchor shaft

Info

Publication number: CN2278083Y
Application number: CN 96242266
Authority: CN
Inventors: 赵建平
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-29
Filing date: 1996-10-29
Publication date: 1998-04-08
Anticipated expiration: 2006-10-29

Abstract

The utility model discloses a high-strength metal anchoring bar which is suitable for supporting and protecting a coal drift and a rock drift under a coal mine. A bar body is in a left-hand thread structure with a low longitudinal rib or without a longitudinal rib, and the material of the bar body is 20 to 25MnSi steel. The metal anchoring bar because of low longitudinal rib, high strength, and good straightness can realize the best match with an anchoring hole, and is more than two times as high intensity as existing metal anchoring bars. A left-hand thread structure of a latitudinal rib is favorable for whisking of an anchoring agent, the anchoring agent can automatically be squeezed into the bottom of the hole during the whisking process causing the anchoring agent to uniformly contact with the bottom of the hole, and loads can be efficiently transferred. The utility model provides a good condition for realizing the quick installation of the anchoring bar, ensures the safety of supporting and protecting of a drift, and enhances the production benefit.

Description

A kind of high duty metal anchor pole

Engineering roadway support field under the utility model possession is a kind of anchoring coal road that is used for, the high duty metal anchor pole of rock gangway, and it is made up of the body of rod, locknut, packing ring and nut.

The producing coal country of world today's prosperity uses anchor pole to become the developing direction of colliery development heading supporting.The China's coal-mine underground passage adopts bolt support to start late, compare and there is a big difference with world standard, especially the present anchor metal that in China's coal-mine, generally uses, intensity is on the low side, its main cause is that the body of rod of manufacturing anchor pole is to make with common Q235 carbon steel mostly, its minimum yield limit only is 235MPa, about the low 140-150% of external High strength bolt, its profile all has the vertical rib of two herringbones in addition, add the skew in the reinforcing bar core garden that the axial float of roll causes when rolling owing to vertical rib is higher, cause the minimizing of the anchor pole body rod tailing screw flight diameter after the processing, intensity is reduced once more, taking diameter is that the screw-thread steel of φ 22 is an example, and vertical rib place radial dimension is 24mm, tolerance _-1.0 ^{+ 2.5}, but the screw-thread steel tolerance of using at present generally is the upper limit, have in addition surpassed the upper limit, outside dimension is reached about 29.5mm, in the anchor hole of the φ 27-28 that can't pack into.Even the body of rod of φ 20, there is not much assurance yet, this is the main cause that the anchored force low-intensity reduces, because body of rod diameter is less than normal, material is poor again, so anchoring density certainly will strengthen when construction, seriously restricted the driving speed of coal mine roadway, influenced the productivity effect of mine, and too high vertical rib is unfavorable for the stirring of anchoring agent, the anchoring agent contacts with the inequality of the body of rod brings hidden danger also for the supporting safety of mine, so the low vertical rib anchor pole of development high strength is imperative.

The purpose of this utility model is to overcome above-mentioned deficiency of the prior art and provides a kind of high strength the low anchor pole of indulging rib.

Its purpose can realize by following scheme, and anchor rod body is designed to low vertical rib left hand thread structure, and the height of vertical muscle can be controlled between the 0-1.25mm, and the left hand thread on the body of rod can be crescent, the lonely shape in garden, contour shape; For can adopting the 20-25MnSi steel rolling, the material that strengthens the anchoring strength body of rod becomes the left hand thread series bar base of φ 18, φ 20, φ 22, φ 25, φ 28 diameters.

The utility model compared with prior art has the following advantages:

1, the intensity of High strength bolt comparable Q235 steel common bolt on equal parameter is high more than 1 times, as under relatively poor top board condition, using, can improve self intensity of rock mass, anchor pole also extends with the distortion of top board simultaneously, thereby improves the supporting capacity of supporting;

2, the left hand thread shape on body of rod surface can be between the body of rod and anchoring agent transmitted load effectively, be applicable to end anchor and full anchor;

3, the low longitudinal system of the body of rod, the rolled thread that is very beneficial for the bar tail is processed, and has deducted the trouble that clamping centering in car garden is brought, and has reduced cost;

4, the left-handed cross rib of the body of rod helps the stirring of resin anchoring agent, in the installation process that stir to advance, can automatically the hole be clamp-oned in the anchoring agent at the bottom of;

5, by the intensity height, directly spend, can in best anchor hole, realize optimum Match, obtain maximum anchored force, provide good condition for realizing the anchor pole Fast Installation, strengthened the stability of roadway support, guaranteed tunnel safety, improved the ore deposit productivity effect.

Following drawings attached explanation:

Fig. 1 is the overall structure schematic diagram that does not have the vertical left-handed anchor pole of rib;

Fig. 2 is low vertical rib body of rod schematic diagram;

Fig. 3 is low vertical pole body sectional drawing;

Fig. 4 is that crescent does not have vertical rib body of rod schematic diagram;

Fig. 5 is body of rod cross rib crescent section figure;

Fig. 6 is the contour tee section figure of body of rod cross rib;

Fig. 7 is the lonely tee section figure in body of rod cross rib garden.

Be described further below in conjunction with accompanying drawing, Fig. 1 is the overall structure schematic diagram that does not have the vertical left-handed anchor pole of rib, and it is by the body of rod 1, pallet 2, locknut 3, packing ring 4 and nut 5 are formed, in order to realize the optimum Match of the anchor hole and the body of rod, the anchoring agent is fully stirred, increase anchoring strength, the external form of the body of rod 1 can be designed to not have vertical rib or low vertical rib left hand thread structure, and the height h1 of vertical rib can be controlled between the 0-1.25mm, vertical rib height h1 is 0 o'clock, is referred to as not have vertical rib anchor pole.Such body of rod diameter has improved a grade relatively.Fig. 2 is the chevron shaped low vertical rib body of rod, Fig. 3 is low vertical pole body sectional drawing, h1 represents the height of vertical rib, Fig. 4 is that crescent does not have vertical rib body of rod schematic diagram, it is compared with the crescent building twisted steel anchor rod of the vertical rib of band of present use, its appearance and size has to be entirely different, nominal diameter generally differs about 2-3mm, at diameter is vertical rib of nothing or the low vertical rib anchor pole that uses diameter phi 22 in the boring of φ 28mm, than the vertical rib building of the height that uses φ 20 twisted steel anchor rod, anchored force can exceed about 40KN, the left hand thread end face of anchor pole can be by Fig. 5 crescent, the contour shape of Fig. 6, the lonely shape in Fig. 7 garden is rolled, and the material of the rolling body of rod can be selected the 20-25MnSi steel for use, this material after heat treatment intensity can increase substantially, also can adopt other material according to field demand, body of rod diameter preferably is rolled into φ 18, φ 20, φ 22, φ 25, φ 28 serial bar bases, the user can select for use as required.The anchor pole of vertical rib of rolling this nothing or low vertical rib, general medium and small steel rolling mill all can be competent at, using this anchor pole and present method not to have has any different, just different in the processing of the threaded portion of bar tail, the anchor pole that does not have vertical rib or low vertical rib is without machine car garden, directly rolled thread gets final product, and has so not only reduced the trouble that car garden centering brings, and has improved the integrated carrying ability of the body of rod.The body of rod of φ 22 can also roll out the screw thread of m24 in addition, so just can replace the M22 high strength nut that uses at present with the M24 plain nut, thereby also reduced cost, this high strength does not have the anchor pole of vertical rib or low vertical rib as using under relatively poor top board condition, can improve self intensity of rock mass, anchor pole also extends with the distortion of top board simultaneously, thereby has improved support capacity, improved supporting condition, strength ratio Q235 common bolt is high more than 1 times under the equal conditions.

Claims

1, a kind of high duty metal anchor pole, it is made up of the body of rod, pallet, locknut, packing ring and nut, it is characterized in that the external form of the body of rod can be designed to low vertical rib left hand thread structure, and the height h1 of vertical rib can be controlled between the 0-1.25mm.

2, anchor pole as claimed in claim 1 is characterized in that the left hand thread of the body of rod can be crescent, the lonely shape in garden, contour shape.

3, anchor pole as claimed in claim 1 is characterized in that body of rod material can adopt the 20-25MnSi steel rolling to become the left hand thread series bar base of φ 18, φ 20, φ 22, φ 25, φ 28 diameters.