Self-drilling hollow anchor rods in the treatment of disastrous slope
by Anna S. Optimization SpecialistWith the rapid development of social economy and infrastructure construction, the treatment of geological disasters such as high and steep slope collapses and landslides are facing new challenges. There are various forms of slope protection technology. In recent years, self-drilling hollow anchor rods have been widely used in various protection and reinforcement projects.
The following case shows the superiority of
self-drilling hollow anchor rods in the treatment of hazardous geological
slopes through the Yangjiang Nuclear Power Plant project. The Yangjiang Nuclear
Power Station is located in Yangjiang City, Guangdong Province. The slope on
the west side of the main plant area is a rock slope. Due to the impact of rain
erosion and blasting construction, local slopes have collapsed and fallen
blocks. To strengthen the local stability of the slope and determine the local
protection and reinforcement treatment plan, plain concrete repair, and
self-drilling hollow anchor rod anchoring lattice structure are adopted. The
anchor rod length is 6 m to 12 m, and the standard length is 6 m The anchor rod
connection is lengthened. The self-drilling hollow anchor rod can meet the
tensile and compression design anchoring force of 50kN-1500kN.
The mechanics’ principle of self-drilling hollow anchor the rod can be summarized as follows:
(1) Anchor rod suspension function: The anchor rod
penetrates the weak and loose rock and soil, and anchors into the stable ground
to generate tensile force to prevent the slope cave wall from slipping and
falling.
(2) Compression and reinforcement: the compression zones
of adjacent bolts overlap each other to form a compression zone, which enhances
the integrity and improves the bearing capacity.
(3) Combination beam (arch) function: After the anchor
rod is inserted into the stratum to a certain depth, the stratum squeezes each
other under the action of the anchoring force to enhance the bearing capacity
of the stratum.
The practice of the slope protection and reinforcement treatment project on the west side of the main plant area of Yangjiang Nuclear Power Station proves that the self-drilling hollow bolt integrates drilling, grouting, and anchoring. After the anchor rod is drilled, it can be used as a drill rod without pulling out. The hollow of the anchor rod is a grouting channel, and grouting is carried out from the inside to the outside. The three-in-one function of anchor rods can form anchor holes and ensure the effect of anchoring and grouting without special measures such as wall protection or pre-grouting during construction under various surrounding rock conditions. The self-drilling hollow anchor rod has a full-body thread, which can be cut and connected to lengthen arbitrarily, which can be applied to a relatively narrow construction space, and realizes the design idea of an extra-long anchor rod to strengthen surrounding rock. The high-efficiency stop plug keeps the grouting at pressure, fills the voids, and consolidates the broken rock mass. High-strength backing plates and nuts uniformly transfer the stress of the deep surrounding rock to the surrounding rock of the cave wall to achieve the purpose of supporting the surrounding rock. The self-drilling hollow bolt has a simple process, convenient and quick construction, and the construction efficiency of the traditional grouting bolt is increased by more than 30%.
Self-drilling hollow anchor rods bring great convenience to the treatment of disastrous
geological slopes and the protection and reinforcement of slopes are more
advanced, applicable, and economical, and have an effect that other anchoring
materials cannot replace.
Sinorock is a high-tech enterprise specializing in the
research and development, production, and sales of geotechnical anchorage
engineering materials. Sinorock self-drilling hollow bolts are widely used in
slope support, tunnel advance support, foundation pit support, foundation
construction support, etc. For more than ten years, Sinorock products and
services have won unanimous praise from customers in more than 40 countries and
regions all over the world.
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Created on Sep 17th 2021 22:29. Viewed 186 times.