Prestressed hollow anchor bolt consists of steel shell-expansion anchor head, hollow anchor rod, grouting stopper, arch plate and nut. Coupling and grouting block are optional. It is designed for hard rock at fractured zone with growing joints which may cause loosing of fractured rock and reducing of friction between rocks, resulting in loosing of surrounding rocks in larger area. Applying enough pre-stress would keep its stability.
1 prestressed hollow anchor bolt
2 steel shell-expansion anchor head
3 diameter:25/28/32mm,special size can be customized
4 high quality and competitive price
5 designed for hard rock at fracture zone
drill the hole and clean
insert the anchor bolt to the hole bottom
pre-stress the anchor rod and assure the anchor head contacting closely with hole bottom, then rotates the anchor rod until it is fastened, and install stopper, plate and nut;
apply pre-stress to the designed value ,use the stretching gauge of anchor bolt or spanner;
Connect of grouting joints to grout
Product Specification / Models
Breaking load(KN) t≥150-180t≥180-220t≥220-250
thread typetu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0left hand
length tolerance tu00b12.5%t
Luoyang，One of the greatest historical cities of China famous for the peony flowers, as well as a modern industrial center. Based in Luoyang, Luoyang Gongyan Technology co., Ltd（herein after called GY） is a specialized manufacturer and distributor of rock bolts and other tunneling & mining products。
GY main products are hollow bolt, self-drilling bolt and accessories. GY also helps the clients source the below geo-technical materials in China: waterproof board , geo-textile, geo-membrane, geo-grid, geomat , corrugated pipes, expansion rubber and steel fiber. .etc
Since we have been in this business over 5 years, we have participated in lots of latest great projects in China, such as Qingdao-lanzhou highway, Beijing-shanghai high-speed railway, South water to north project, Yangjiang and Taishan nuclear power station, Jiangpinghe and Dahua dam. .etc. Further, we have established steady business relations with customers inland and overseas.
In future GY will go on satisfying our clients with reliable quality and competitive price, Our special tailored-made is waiting for you upon your demand.