CN2336095Y

CN2336095Y - Left-hand screw anchor bolt

Info

Publication number: CN2336095Y
Application number: CN 98244264
Authority: CN
Inventors: 秦斌青; 王继宗
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-24
Filing date: 1998-09-24
Publication date: 1999-09-01
Anticipated expiration: 2008-09-24

Abstract

The utility model relates to a left-hand screw anchor bolt which belongs to the technical field of the surface consolidation of a base. The surface of the anchoring segment of the anchor bolt forms a left-hand screw thread shape. Compared with an original screw thread steel, an existing screw thread steel adopts a screw thread shape with less thread pitch and higher thread height. A bolthole outer segment (5) can also adopt the size which is larger than the diameter of the anchoring segment to improve the plenum degree of the anchoring agent in an anchor hole, and the action between the anchor bolt and the base can be increased, and thus, the performance of the anchoring structure of the anchor bolt can be improved.

Description

Left-hand screw anchor bolt

The utility model belongs to the matrix surface reinforcing technique, relates generally to the big improvement structure of anchor pole.

Known anchor pole is to reinforce a kind of parts that wall or building surface intensity are surveyed in the rock stratum, and various ways is arranged, and by wide weary the employing, can effectively increase the bond strength with the anchoring agent in construction, improves anchoring effect.

The purpose of this utility model is the Left-hand screw anchor bolt structural concept that proposes to increase the substantial degree of anchoring agent in the construction.

The purpose of this utility model is to realize like this, anchor pole comprises the body of rod that can be divided into section outside anchoring section and the hole, with section nut engaged outside its hole, with matrix surface in the body of rod, nut and the use supporting plate that matrix surface matches that matches, the surface of anchoring section is made and is had the concaveconvex shape that increases combined surface area and frictional resistance, wherein, described anchoring section surface configuration is a left hand thread.Like this, when favourable combination was fixing, the left hand thread in the construction can become the screw propulsion duty when stirring the anchoring agent, push the anchoring agent to hole at the bottom of, improve its circularity in anchor hole, improve anchoring effect, thereby realized the purpose of this utility model.

The left-hand thread of anchoring section described in the utility model continuously, makes its effect to the anchoring agent abundant continuously on the anchor pole total length, has also satisfied the cooperation requirement of nut simultaneously; Improved the inconsistent or discontinuous situation in twisted steel anchor rod commonly used surface.

A section diameter is selected the size bigger than anchoring section for use outside the hole described in the utility model, makes the overall construction intensity equilibrium after the anchoring.

The pitch of anchoring left-hand thread described in the utility model is little than the corresponding pitch of screw-thread steel, and thread depth is big than its analog value, and this can increase the active area of screw thread to the anchoring agent, improves bond strength.

The utility model has guaranteed the circularity of anchoring agent necessity by changing the concrete structure of anchor pole, has improved the bond strength between anchor pole and anchoring agent, has improved the strength structure of anchoring whole, has strengthened anchoring effect.

Fig. 1 is the Left-hand screw anchor bolt that is used for roadway support;

Fig. 2 is the Left-hand screw anchor bolt of standard thread for the outer end.

The outer section of 1 left-hand screw screw thread, 2 anchoring sections, 3 supporting plates, 4 nuts, 5 boltholes among the figure

The utility model is described in further detail below in conjunction with embodiment.

First embodiment such as Fig. 1 are the anchor poles that is used for the mine laneway supporting.Its length overall 1-2.5m, diameter 18-22mm.It is 3-12m that the anchor pole total length is made pitch, and the left-handed spiral shell of the high 0.5-2.5mm of screw thread causes 1, and used nut 4 also matches with it.In the construction of assembling anchor pole, because the progradation of left hand thread can be pressed to the anchor hole bottom in the stirring to the anchoring agent, improve the substantial degree of anchoring agent, increase active area and effect class between itself and anchor pole.To the anchor pole of this routine diameter 18 * 2000mm, anchored force can reach 150-180KN.

Second embodiment such as figure two, structure is consistent with example one, and just section 5 is a standard thread outside its hole, and more or less freely convenience is singly made and used to mode of occupation with last identical.

The 3rd embodiment is consistent with example two, but section 5 is selected the bigger thread size of more used screw-thread steel nominal diameter for use outside its hole.As this routine anchor pole made from the screw-thread steel of diameter 18mm, section is selected the screw thread of M20 for use outside its hole.The relation of anchor rod anchored section and outer end supporting capacity has been adjusted in the apolegamy of this example, can accomplish with material rationally, improve the supporting capacity of anchor pole.

Claims

1, Left-hand screw anchor bolt comprises the body of rod that can be divided into section outside anchoring section and the hole, with section nut engaged outside its hole, with matrix surface in the body of rod, nut and the use supporting plate that matrix surface matches that matches, the surface of anchoring section is made and is had the concaveconvex shape that increases combined surface area and frictional resistance, and it is characterized in that: described anchoring section surface configuration is left hand thread (1).

2, anchor pole according to claim 1 is characterized in that: the left-hand thread of described anchoring section (1) on the anchor pole total length continuously.

3, anchor pole as claimed in claim 1 or 2 is characterized in that: section (a 5) diameter is selected the size bigger than anchoring section for use outside the described hole.

4, anchor pole as claimed in claim 1 or 2, it is characterized in that: the pitch of described anchoring section left-hand thread is little than the corresponding pitch of screw-thread steel, and thread depth is big than its analog value.