With the strength of the transport, energy and other infrastructure construction, in tunnel, the basement and slope, as an anchorage technology that can give full play to the rock mass self-stabilization ability has been developing rapidly, increasing dosage of hollow rock bolt, show broad prospects for development.
In order to fundamentally overcome the shortcomings of ordinary mortar anchor, improve the anchor construction technology and operating characteristics, to ensure the quality of anchor engineering, hollow bar has RD ordinary hollow bar system, the EX steel shell hollow grouting anchor series, SD self drilling hollow anchor bolt and the corresponding DML30 type 2 special anchor grouting pump and torque wrench and other supporting equipment, formed a complete system of hollow bar system, can adapt to different strata, and the design bearing capacity of rock and earth anchoring construction requirements.
Hollow bar system can ensure grouting anchor rod and the wall of hole full, giving full play to the bolt anchoring effect.Can provide immediately supporting force (or prestressed plate force) after the rock mass excavation ,effectively protect the inherent strength of rock mass, to prevent loosening and deformation of surrounding rock, and to enhance the stability of geotechnical engineering.The rod body have enough size package, which greatly improves the ability of resistance to corrosion, shows good durability.
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http://hollowbar.pixnet.net/blog/post/74445357