Price of pipe seam anchor rod, use of pipe seam anchor rod

Description :

　　Pipe seam anchor rod is a new type of anchor rod that actively strengthens the surrounding rock by anchoring the entire length. Its three-dimensional part is a high-strength steel pipe with a longitudinal seam. When installed in a borehole slightly smaller than the diameter, it can immediately apply radial pressure to the borehole wall and prevent the sliding friction force of the surrounding rock within the entire length range. In addition, the support force of the anchor rod tray plate can make the surrounding rock in a three-dimensional stress state and achieve great rock formation. In the case of blasting vibration and rock anchoring displacement, the anchoring force increases significantly in the later stage. When the rock undergoes significant displacement, the anchor rod does not lose its supporting resistance, and it has better characteristics than the expansion shell anchor rod.

　　Specification of pipe seam anchor rod

　　1. Outer diameter (mm): Φ 30, Φ 33, Φ 40, Φ 43 (± 0.5);

　　2. Length (millimeters): 1200, 1500, 1800, 2000, 2500

　　3. Material: Q235, 16Mn, 20 Mnsi.

　　Working principle of pipe seam anchor rod

　　Install the pipe seam anchor rod in a borehole smaller than the diameter of the pipe. At this time, three types of forces will be applied to the surrounding rock: radial pressure on the borehole wall throughout the entire length of the pipe seam anchor rod, frictional force to prevent the surrounding rock from sliding down, and the support force of the pipe seam anchor rod tray support plate. These three forces make the surrounding rock more stable.

　　Technical characteristics of pipe seam anchor rod

　　l、 The raw material is made of high-strength alloy strip steel;

　　2. Easy installation;

　　3. No anchoring agent required;

　　4. The friction between the anchor rod and the rock mass is high;

　　5. Has high shear and tensile strength;

　　6. Equipped with high-strength trays, the trays are evenly stressed;

　　7. The height of the tunnel is greater than the length of the anchor rod.

　　Technical requirements for pipe seam anchor rod

　　1. The surface of the seam pipe anchor rod should be flat, without serious scratches or rust. The weld seam should have no cracks, no pores or slag inclusions, and it is not allowed to burn through the pipe wall. The tray should be able to move freely on the pole. It is advisable to have the interface of the retaining ring and the opening of the pipe seam offset by 170o to 190o from each other.

　　2. The pull-out force of the retaining ring weld is ≥ 80kN, the ultimate tensile strength of the rod body is ≥ 110kN, the initial anchorage force is ≥ 25kN/m, and the tray bearing capacity is ≥ 65kN

　　Technical performance of pipe seam anchor rod

　　1. Initial anchoring force: 3-7 tons;

　　2. Pipe ring pull-out load: 8-10 tons;

　　3. Anchor rod pipe tensile strength: 12-13 tons;

　　4. The corrosion resistance is 20-30% higher than A3 steel, which is conducive to long-term use.

　　Method of using pipe seam anchor rod

　　1. Determine the anchor bolt hole position according to the design requirements and use drilling tools to drill holes.

　　2. Blow away the rock powder inside the hole with compressed air.

　　3. Install the anchor plate on the rod body and use an impact drill to drive the anchor rod into the hole. zmjt055

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• Pipe seam anchor rod