Handan Zhongfu Industrial And Mining Accessories Co., Ltd.
Handan ZhongFu company is a professional manufacturer for underground mining supporting products with over ten year experience. We can manufacture Split sets ,friction bolt, Combi split sets, Expandable friction bolt,Swellex, Threaded bar bolt, Cable bolt, Combi cable bolt, Welded mesh, Domed plate, Nuts, other mining Equipment.
what is the working principle of Friction Bolt?
-
The diameter of pipe slit anchor is 30~45 mm, the wall thickness is 2~3 mm, the width of slit is 10~15 mm, according to the needs of processing, generally 1.6~2.0 m. The diameter of pipe slit anchor is 1~3 mm larger than the diameter of the drilling hole, when the rod is pressed into the drilling hole, the slit steel pipe is compressed, the outer wall of the steel pipe and the wall of the drilling hole are tightly squeezed, which generates radial compressive pressure along the whole length of the pipe and axial friction force, and prevents the deformation of the surrounding rock. A compressive stress field is generated in the surrounding rock to stop the deformation of the surrounding rock.
-
Tube-seam staggered rods have rods rolled from high-strength, high-elasticity steel tubing or thin steel plates with longitudinal seams along the full length. The end of the rod body is made into a cone, so that the installation; tail welded with a 6 ~ 8mm of steel bent into a retaining ring, used to press the pallet.
-
The anchoring force of pipe slit anchors is related to a variety of factors, including the diameter difference between the open slit pipe and the drill hole, the drill hole diameter, the material and thickness of the steel pipe, the length of the open slit pipe, and the surrounding rock conditions. Within a certain range, the larger the difference between the diameter of the steel pipe and the drilled hole, the smaller the diameter of the drilled hole, the higher the modulus of elasticity of the steel pipe, the larger the thickness of the steel pipe, the longer the open slit pipe, and the larger the coefficient of friction between the steel pipe and the surrounding rock, the larger the anchor force of the anchor rod. The anchoring force of pipe slit anchors in China's coal mines is generally up to 50~80 kN.The main advantages of pipe slit anchors are that they are anchored at full length, provide compressive stress to the wall of the drilled hole immediately after installation, and that the anchoring force increases gradually with the increase in deformation of the surrounding rock. Due to these advantages, pipe slit anchors have been more widely used for some time and are still used in rocky roadways.
Our address
West Side Of Jianshe Street, Southwest Industrial Zone, Linmingguan Town, Handan, Hebei, China
Phone Number
+8615830050566
zfgongkuang@aliyun.com
