Rock bolt reinforcement can improve the strength and self-stability of rock mass, effectively control the deformation of geotechnical, and has a positive effect on the stability of tunnel excavation.
The use of rock bolts in geotechnical engineering has become one of the most economical and effective methods to improve the stability of geotechnical engineering and solve complex engineering problems. This article will introduce the types of rock bolts
They are many types of rock bolts. Let’s explore some of them.
Self-Drilling Rock Bolt
Another name for self-drilling rock bolts is hollow bars. A hollow anchor bar, nut, plate, coupler, centraliser, and drill bit make up the self-drilling anchor system. Because of their hollow core, these bolts enable grout to be injected and drilled simultaneously, solidifying the surrounding rock. It is appropriate for fragmented rocks and surrounding rocks that are challenging to drill holes in because it combines the duties of drilling, grouting, and anchoring. The self-drilling rock bolt works well with loose rock, shattered rock, and other geology that collapses easily and makes holes difficult to produce. It can achieve the best building effect and significantly enhance the supporting effect in difficult geology.
Expansion Shell Hollow Rock Bolt
A hollow anchor bar, plate, nut, and expansion shell make up the expansion shell hollow anchor bar. A torque wrench can be used to modify and prestress the expansion shell hollow anchor bar. The bolts have capacities ranging from 100 to around 500KN and are usually 1 to 5 meters long. mostly utilised for systematic support in tunnels and mining.
Swellex Rock Bolt
The components of a Swellex rock bolt, also called a hydraulic expansion bolt, are a tray, retaining ring, liquid injection end, and end sleeve. There is nothing like the Swellex rock bolt. After inserting the bolt into the bolt hole, high-pressure water must be used to cause it to expand. The pipe wall will fully fit the uneven hole wall of the bolt hole as a result of the water-swelling bolt creating permanent deformation during the expansion phase. The entire length of the bolt generates friction and self-locking force, reinforcing the rock mass. The swellex anchor is currently widely utilised because of its high flexibility, safety, dependability, and ease of installation.
Refined Rolled Thread Bar
Discontinuous threads in refined rolled thread bars improve their capacity to grasp rock. These bolts offer dependable reinforcing in difficult geological conditions.
Split Set Rock Bolts
Split Set rock bolts, which consist of a tube with slots along the length of it, are straightforward but efficient. When the bolt is installed, it expands, applying radial pressure to stabilise the nearby rock.
