CN106523007A - Anchor rod body transverse rib structure used for promoting anchoring force - Google Patents

Abstract

A cross-rib structure of an anchor rod body used to increase anchoring force, including a rod body and a cross rib, the cross rib is arranged on the outer surface of the rod, the cross rib is a crescent-shaped structure, two cross ribs form a group, and two cross ribs in the same group The transverse ribs are connected end to end, and two transverse ribs in the same group are distributed around the entire circumference of the rod body; several groups of transverse ribs are distributed at equal intervals along the axial direction of the rod body, and there is a 90° gap between the transverse ribs in adjacent groups phase angle; the transverse rib has a helix angle on the outer surface of the rod, and the helix angle is 10°±1°, and all the transverse ribs have the same rotation direction; the cross-sectional shape of the transverse rib is isosceles trapezoidal, and the top edge axis of the transverse rib The maximum width in the horizontal direction is 1.5mm±0.05mm, the maximum axial width of the bottom edge of the transverse rib is 3.6mm±0.05mm, and the maximum radial thickness of the transverse rib is 1.8mm±0.1mm. The angle is 60°±1°; the distance between several groups of transverse ribs equally spaced along the axial direction of the rod body is 35mm±1.5mm; the diameter of the rod body is 21mm±0.5mm.

Description

An Anchor Body Transverse Rib Structure for Improving Anchor Force

technical field

The invention belongs to the technical field of roadway safety support, and in particular relates to a transverse rib structure of an anchor rod body for improving anchoring force.

Background technique

In mine production, the stability of the roadway is an important guarantee for mine safety production, and bolt support is the main way of roadway support, and the anchoring force of the bolt body directly affects the effect of roadway support.

At present, the bolt bodies used in bolt support are slightly improved based on the building steel bar standards, but with the increasing excavation depth, the surrounding rock conditions of the roadway are also deteriorating. If you want to rely on the traditional anchor It becomes more and more difficult for the rod body to further improve the roadway support effect. After research, it is found that the transverse rib structure adopted by the traditional bolt body is the most important factor hindering the further improvement of the roadway support effect. Therefore, it is necessary to improve the transverse rib structure of the anchor body to increase the anchoring force of the anchor body and further improve the roadway support effect.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a cross-rib structure of the anchor body for increasing the anchoring force, which can effectively increase the anchoring force between the anchor body and the anchoring agent, and the anchor body is pulled out under force. Among them, the radial extrusion effect of the bolt body on the shear failure of the anchoring agent is effectively enhanced, so that the surrounding rock around the borehole is in a three-dimensional stress state, thereby improving the roadway support effect.

In order to achieve the above object, the present invention adopts the following technical solutions: a cross-rib structure of the anchor rod body used to enhance the anchoring force, including a rod body and a cross rib, and the cross rib is arranged on the outer surface of the rod; the feature is that the cross rib is Crescent-shaped structure, two transverse ribs form a group, the two transverse ribs in the same group are connected end to end, and the two transverse ribs in the same group are distributed around the entire circumference of the rod body; several groups of transverse ribs are arranged along the shaft axis Distributed at equal intervals, and there is a phase angle of 90° between the transverse ribs in adjacent groups.

The transverse rib has a helix angle on the outer surface of the rod.

The helix angle is 10°±1°.

All said transverse ribs have the same hand direction.

The cross-sectional shape of the transverse rib is an isosceles trapezoid.

The maximum axial width of the top edge of the transverse rib is 1.5mm±0.05mm, the maximum axial width of the bottom edge of the transverse rib is 3.6mm±0.05mm, and the maximum radial thickness of the transverse rib is 1.8mm±0.1mm. The angle between the hypotenuse and the base is 60°±1°.

The distance between several groups of transverse ribs distributed equally along the axial direction of the rod body is 35mm±1.5mm.

The rod diameter of the rod body is 21mm±0.5mm.

Beneficial effects of the present invention:

Compared with the prior art, the present invention can effectively increase the anchoring force between the anchor body and the anchoring agent, and effectively enhance the radial force of the anchor body when the anchor body is sheared and damaged by the anchoring agent during the pull-out process of the anchor body. Squeeze, so that the surrounding rock around the borehole is in a three-dimensional stress state, thereby improving the roadway support effect.

Description of drawings

Fig. 1 is the front view of a kind of anchor bar body transverse rib structure that is used to promote anchoring force of the present invention;

Fig. 2 is a right view of a cross-rib structure of an anchor rod body used to enhance anchoring force according to the present invention;

Fig. 3 is a rear view of a cross-rib structure of the anchor rod body used to enhance the anchoring force of the present invention;

Fig. 4 is a left view of a cross-rib structure of an anchor rod body for increasing anchoring force according to the present invention;

Fig. 5 is A-A sectional view among Fig. 1;

Among the figure, 1—rod body, 2—transverse rib.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 5, a cross-rib structure of an anchor rod body for increasing anchoring force includes a rod body 1 and a cross-rib 2, and the cross-rib 2 is arranged on the outer surface of the rod body 1; the cross-rib 2 is a crescent-shaped structure , two transverse ribs 2 form a group, the two transverse ribs 2 in the same group are connected end to end, and the two transverse ribs 2 in the same group are distributed around the entire circumference of the rod body 1; several groups of transverse ribs 2 along the The rod bodies 1 are distributed at equal intervals in the axial direction, and the transverse ribs 2 in adjacent groups have a phase angle γ of 90°.

The transverse rib 2 has a helix angle θ on the outer surface of the rod body 1 .

The helix angle θ is 10°±1°.

All said transverse ribs 2 have the same direction of rotation.

The cross-sectional shape of the transverse rib 2 is an isosceles trapezoid.

The axial maximum width a of the top edge of the transverse rib 2 is 1.5mm±0.05mm, the axial maximum width b of the bottom edge of the transverse rib 2 is 3.6mm±0.05mm, and the radial maximum thickness h of the transverse rib 2 is 1.8mm ±0.1mm, the angle α between the hypotenuse and the bottom edge of the transverse rib 2 is 60°±1°.

The distance L between the several groups of transverse ribs 2 equally spaced along the axial direction of the rod body 1 is 35mm±1.5mm.

The rod diameter of the rod body 1 21mm ± 0.5mm, while the national standard size rod diameter 20mm.

In order to better illustrate that the anchor body can effectively increase the anchoring force between the anchor body and the anchoring agent after adopting the transverse rib structure of the present invention, a comparative pullout test was carried out. In the comparative pull-out test, prepare 3 anchor rod bodies with the traditional transverse rib structure, prepare 3 anchor rod bodies with the transverse rib structure of the present invention at the same time, and carry out the pulling under the same test conditions on 6 anchor rod bodies pull-out test, and the rod body 1 rod diameter of the 6 anchor rod bodies Both are 20mm.

After the pull-out test, the pull-out forces of 3 anchor rod bodies with the traditional transverse rib structure were measured to be 127.5kN, 124.1kN and 116kN respectively, and the pull-out resistance of 3 anchor rod bodies with the transverse rib structure of the present invention were measured at the same time They are 147.8kN, 151.7kN and 148.7kN respectively. It can be seen that the anchor rod body adopting the transverse rib structure of the present invention effectively improves the anchoring force.

Due to the non-rib side of the traditional anchor body, during the pull-out test, the anchoring agent overflows along the rib-free side of the traditional anchor body during the installation process; the distance between the transverse ribs on the ribbed side of the traditional anchor body is 12mm , within the same length, the traditional anchor body has more transverse ribs than the present invention. Under conventional thinking, the traditional anchor body should have higher pullout resistance due to the larger number of transverse ribs. But the results of the pull-out test are just the opposite, indicating that the number of transverse ribs is not the only factor affecting the pull-out force.

In the solution of the present invention, the two transverse ribs 2 in the same group are distributed around the entire circumference of the rod body 1, and there is a phase angle of 90° between the transverse ribs 2 in adjacent groups, which effectively avoids anchoring The agent overflows along the rod body.

In the scheme of the present invention, the transverse rib 2 adopts a crescent-shaped structure, and the cross-sectional shape of the transverse rib 2 is an isosceles trapezoidal shape. When the anchoring agent is sheared and damaged, the radial extrusion effect of the anchor rod body on the anchoring agent is effectively enhanced, so that the surrounding rock around the borehole is in a three-dimensional stress state, which directly manifests as an increase in the anchoring force, and the final increase is is the roadway support effect.

The solutions in the embodiments are not intended to limit the scope of patent protection of the present invention, and all equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims (8)

1. A bolt body cross-rib structure for promoting anchoring force, comprising a rod body and a cross-rib, the cross-rib is arranged on the outer surface of the rod; it is characterized in that: the cross-rib is a crescent-shaped structure, and two cross-ribs are a The two transverse ribs in the same group are connected end to end, and the two transverse ribs in the same group are distributed around the entire circumference of the rod body; several groups of transverse ribs are distributed at equal intervals along the axial direction of the rod body, and in adjacent groups There is a phase angle of 90° between the transverse ribs. 2 . The cross-rib structure of the anchor rod body for increasing the anchoring force according to claim 1 , wherein the cross rib has a helix angle on the outer surface of the rod. 3 . 3. The cross-rib structure of the anchor body for increasing the anchoring force according to claim 2, characterized in that: the helix angle is 10°±1°. 4 . The cross-rib structure of the anchor rod body for increasing the anchoring force according to claim 3 , wherein all the cross-ribs have the same rotation direction. 5 . 5 . The cross-rib structure of the anchor rod body for increasing the anchoring force according to claim 1 , wherein the cross-sectional shape of the cross-rib is an isosceles trapezoid. 5 . 6. A cross-rib structure of an anchor rod body for enhancing anchoring force according to claim 5, characterized in that: the maximum axial width of the top side of the cross-rib is 1.5mm±0.05mm, and the bottom of the cross-rib The maximum axial width of the side is 3.6mm±0.05mm, the maximum radial thickness of the transverse rib is 1.8mm±0.1mm, and the angle between the hypotenuse and the bottom edge of the transverse rib is 60°±1°. 7 . The cross-rib structure of the anchor rod body for increasing the anchoring force according to claim 1 , wherein the distance between several groups of said cross-ribs distributed at equal intervals along the axial direction of the rod body is 35mm±1.5mm. 8 . The cross-rib structure of the anchor rod body for increasing the anchoring force according to claim 1 , wherein the diameter of the rod body is 21 mm±0.5 mm.