![]() Self-drilling Anchor Rock Bolt Support Broken Conditions, Cost-effective and Good Anchoring Effect Time: From:This Site In projects, using self-drilling rock bolts, it is inevitable to support geological conditions with soft and broken covering layers and hard rock layers. ![]() They are cost-effective, easy to process, and of a higher anchoring ef View details What Are Rock Anchor Bolts? Time: From:This Site Rock anchor bolts are widely applied to various geology support projects in recent years. Next: Anchor bolt' 5 methods to avoid corrosion.Pre: Why self-drilling anchor bolts can replace ordinary mortar anchor and friction bolts for support in soft and water-rich geology?.Engineers can provide professional system solutions according to the geological conditions, making the construction of the project safer and more efficient. Sinorock® has been focusing on the research of self-drilling hollow anchor bolts for many years, and has developed four product systems for different geology, namely: R thread self-drilling anchor bolt system, T thread self-drilling anchor bolt system, Double anti-corrosion anchor bolt system, Stainless steel anchor bolt system. It fundamentally reversed the situation that anchor bars could not be placed or the length could not meet the requirements in the soft and narrow formations. It also has the characteristics of arbitrary cutting or using couplers for lengthening. Self drilling anchor bolts provides higher bonding stress than smooth steel pipe depending on continuous wave thread. The effective anchor length is often far from the design requirements, so there are serious hidden dangers in the engineering. ![]() Especially for anchors longer than 3.0 meters, the fullness of the grout is more difficult to control. Ordinary mortar anchors often use the process of grouting first and then inserting steel bar, which makes human factors a great influence on grouting effect. This allows a sufficiently thick and uniform protective layer to be formed around the hollow bar, which greatly improves the durability. When the slurry flows from the bottom to the orifice, the hole collar plug and the domed plate prevent the slurry from overflowing, to ensure the grouting is full. Self-drilling hollow grouting bolts combine drilling and grouting together, cement slurry will enter through the hollow pipe. Then it will cause corrosion if the bare steel bar contacts with groundwater, thus reducing the durability of the mortar anchor. This process is difficult to ensure the fullness of the grouting and the steel bar will be exposed. Ordinary mortar anchors often use the process of grouting first and then inserting steel bar. So the cost can be further reduced by reducing the density of anchor bolts. Compared with mortar anchors, self-drilling hollow anchors have greater anchoring force. This has prompted the processing of hollow bolts and accessories into equipment production, which has greatly reduced production costs. With the continuous development of hollow grouting technology, the demand for hollow anchors is also increasing. So what are the advantages of self-drilling rock bolt? Analysis are from three aspects: However, with the development of geotechnical anchoring technology, self-drilling hollow anchor bolts are gradually replacing ordinary mortar anchors in the field of geotechnical anchoring due to the advantages. With the vigorous construction of infrastructure in recent years, it has been widely applied in the Hydraulic engineering, highway construction ,ground and foundation projects, etc.įor a long time, ordinary mortar anchor has been widely used in the field of tunnels and slopes because of its low cost. Geotechnical anchoring is an important branch of geotechnical engineering.
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