Lock Foot Anchor Bolt

Hydraulic expansion pipe anchors were developed and produced in 1982 as a support product, widely used in various industries for supporting soft rock strata and high-pressure, large-deformation geological surrounding rock tunnels. They can rapidly control surrounding rock deformation and maintain the stability of tunnel spaces. In 1992, the Kailuan Mining Bureau referred to it as the "Coal Stability Needle" when dealing with large areas of uneven sides. In 1994, the product passed the promotion and evaluation of the Chinese Society of Civil Engineers and the Tunnel and Underground Engineering Society. In 2000, it received the Science and Technology Achievement Review Certificate from the China Railway Engineering Corporation.

Technical Specifications:

Initial anchor force kN

Tensile strength kN

Working Pressure MPa

Anchor rod length m

Rock hole diameter mm

Theoretical Quality Dept. kg/m

　　≥50

　　≥91

　　15 ~ 20

　　1 ~ 3

　　Φ36~Φ46

　　2.3

Application Range: 1. Tunnel support. 2. Mountain slope protection. 3. Excavation side support.

Usage Instructions:

1. Determine anchor bolt hole positions according to design requirements, and bore holes using drilling equipment.

2. Blow out the rock dust inside the holes with compressed air.

3. Install the rod body onto the anchor plate and insert it into the hole.

4. Fit the syringe over the anchor rod injection nozzle.

5. Inject 15~20 MPa high-pressure water into the anchor rod to swell it.

Principle of Load-bearing: As the anchor rod inflates with water, 15 MPa of high-pressure water acts through the tube wall on the rock cavity, causing the rock mass to deform. The metal tube wall then undergoes plastic deformation, embedding within the rock mass. The anchor rod can bear load immediately after installation, with a high bearing capacity.

Our company specializes in manufacturing various specifications of metal flexible hoses, ball check valves, hydraulic jack-up columns, jack-down columns, testing instruments, as well as various mining K-type connectors, straight-through, tee, and plug sockets,焊接式管接头, sleeve-type pipe joints, and sand, tapered sealing pipe joints, brazed pipe joints, SAE flanges, -3, -6, a variety of rubber hose connectors, British, American, A, B, C, D, F, T-type connectors, etc. We strive for survival through quality and for development through integrity. Corean is sincerely committed to serving you.