Supporting method of pressure-bearing end anchor with high pre-tightening force bolt

Abstract

The invention discloses a pressure-bearing type end-anchoring high-pretightening-force anchor rod support method which is applicable to surrounding rock support in mine sinking and driving engineering. According to the method, at the end of the hole bottom, an anchor rod is fully adhered to surrounding rocks of the bottom of an anchor rod hole through a resin cartridge, and end anchoring effect is realized; a PVC (polyvinyl chloride) sleeve or a sleeve made of similar materials is mounted on an anchor rod body of a free section, a space between the sleeve and the anchor rod hole is filled with cement mortar, a cement mortar body is fully adhered to surrounding rocks of the anchor rod hole, and the cement mortar body cannot be adhered to the anchor rod due to the sleeve, so that pretightening force can be ensured to be applied to the anchor rod at different time periods, and the pretightening force of the anchor rod can be remarkably increased; particularly, under the condition of weak surrounding rocks, the cement mortar body of the free section can bear the pretightening force if an anchoring section at the resin end is displaced, so that support efficiency of the pretightening-force anchor rod is guaranteed to the greatest extent, and stability and safety of surrounding rocks of deep tunnels are facilitated.

Description

technical field

[0001] The invention relates to a pressure-bearing end anchor high pre-tightening force bolt support method, which is especially suitable for the control of the stability of weak surrounding rocks in deep roadways, and is also suitable for the support and maintenance of mine shaft engineering and high and steep slope engineering. Background technique

[0002] Prestressed bolt support is currently the main technical means to control the displacement stability of deep roadways. The anchoring methods of the anchor rod include end anchoring, full-length anchoring and extended anchoring.

[0003] When the end is anchored, the free section of the anchor rod is long, and the prestressing range of the anchor rod is large, and the thickness of the effective compressive stress zone formed is large, but the compressive stress in the middle of the free section of the anchor rod is small, thus affecting the anchoring effect. Except for the anchoring end, the tensile forc...

Examples

Embodiment Construction

[0022] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0023] The concrete steps of the pressure-bearing type end anchor high pre-tightening force bolt support method of the present invention are as follows:

[0024] a. According to the surrounding rock conditions of the roadway and the requirements of stability control, design the pre-tightening force of the bolt, the anchor length of the end anchor section and the row spacing between the bolts, and drill in the surrounding rock 10 with a bolter rig at the design position according to the design parameters Drill the bolt hole 8, and clean the bolt hole;

[0025] b. Install the end anchor resin anchor rod, and put the resin drug coil 9 into the hole according to the requirements; according to the designed end anchor length, first send the anchor rod 6 with the resin drug coil on the head into the constructed anchor rod drilling hole Carry out the end anchor in...

technical field

[0001] The invention relates to a pressure-bearing end anchor high pre-tightening force bolt support method, which is especially suitable for the control of the stability of weak surrounding rocks in deep roadways, and is also suitable for the support and maintenance of mine shaft engineering and high and steep slope engineering. Background technique

[0002] Prestressed bolt support is currently the main technical means to control the displacement stability of deep roadways. The anchoring methods of the anchor rod include end anchoring, full-length anchoring and extended anchoring.

[0003] When the end is anchored, the free section of the anchor rod is long, and the prestressing range of the anchor rod is large, and the thickness of the effective compressive stress zone formed is large, but the compressive stress in the middle of the free section of the anchor rod is small, thus affecting the anchoring effect. Except for the anchoring end, the tensile forc...

Examples

Embodiment Construction

[0022] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0023] The concrete steps of the pressure-bearing type end anchor high pre-tightening force bolt support method of the present invention are as follows:

[0024] a. According to the surrounding rock conditions of the roadway and the requirements of stability control, design the pre-tightening force of the bolt, the anchor length of the end anchor section and the row spacing between the bolts, and drill in the surrounding rock 10 with a bolter rig at the design position according to the design parameters Drill the bolt hole 8, and clean the bolt hole;

[0025] b. Install the end anchor resin anchor rod, and put the resin drug coil 9 into the hole according to the requirements; according to the designed end anchor length, first send the anchor rod 6 with the resin drug coil on the head into the constructed anchor rod drilling hole Carry out the end anchor in...

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