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.
The anchoring force of the pipe joint anchor rod is related to various factors, including the diameter difference between the joint pipe and the borehole, the borehole diameter, the material and thickness of the steel pipe, the length of the joint pipe, and the surrounding rock conditions. Within a certain range, the larger the difference between the steel pipe and the borehole diameter, the smaller the borehole diameter, the higher the elastic modulus of the steel pipe, the thicker the steel pipe, the longer the slotted pipe, the higher the friction coefficient between the steel pipe and the surrounding rock, and the greater the anchoring force of the anchor rod. The anchoring force of coal mine pipe seam anchor rods in China can generally reach 50-80 kN. The main advantage of pipe seam anchor rods is full-length anchoring, which immediately provides compressive stress to the borehole wall after installation. The anchoring force gradually increases with the increase of surrounding rock deformation. Due to these advantages, pipe seam anchor rods have been widely used for a period of time and are still being used in rock tunnels.
Friction anchored anchor rods include pipe seam type, hydraulic expansion type, and explosive type anchor rods. Among them, the use of pipe seam anchor rods is relatively large, and other anchor rods are rarely used. Below is an introduction to the pipe seam anchor rod.
The body of the pipe seam anchor rod is made of high-strength, high elasticity steel pipes or thin steel plates rolled together, with longitudinal seams along the entire length. The end of the rod is made into a cone shape for installation; There is a retaining ring welded at the tail end, which is bent from 6-8mm steel bars to press the support plate tightly.
The diameter of the pipe seam anchor rod body is 30-45 mm, the wall thickness is generally 2-3mm, the opening width is 10-15 mm, and the length is processed according to the needs, generally 1.6-2.0m.
The diameter of the pipe joint anchor rod is 1-3mm larger than the diameter of the borehole. When the rod is pressed into the borehole, the steel pipe with the joint is compressed and squeezed tightly against the outer wall of the steel pipe and the borehole wall, generating radial compressive stress and axial frictional force along the entire length of the steel pipe, creating a stress field in the surrounding rock, and preventing deformation of the surrounding rock.
Our address
West Side Of Jianshe Street, Southwest Industrial Zone, Linmingguan Town, Handan, Hebei, China
Phone Number
+8615830050566
zfgongkuang@aliyun.com
