Self drilling anchor bolts--An ideal solution for weak soil

In the field of geotechnical engineering, there are complex geological conditions such as weak rock and soil layers, fault fracture zones, and easily collapse geology, which brings great difficulties to engineering construction. Self-drilling anchor bolt integrates the functions of drilling, grouting, and anchoring together. The construction process of simultaneously drilling and grouting is the best solution for loose and weak formations.

Self-drilling anchor bolt is mainly composed of hollow anchor bar, nut, plate, coupler, centralizer, and drill bit. The hollow anchor bar has continuous thread along the full length, thus it can be cut at any position; the thread profile of the hollow bar conforms to international standards, and can be connected with different drilling rigs and accessories. The drill bit is a very important part of the system. The quality of drill bits determines drilling efficiency. After years of research, Sinorock R&D team has continuously optimized the design structure according to actual project data, so that the drilling quality can be ensured during the service life. When choosing a drill bit, the customer can choose the most suitable drill bit according to geological conditions, so as to maximally save costs under the premise of ensuring construction quality.

Self-drilling anchor bolts are the best solution for weak formations. They are widely used in slope engineering, ground and foundation engineering, tunnel and underground engineering. They can be used for pre-construction support and can effectively enhance the stability of soil and rock mass.

For the support of weak ground, the self-drilling anchor bolt construction technology has the main advantages as follows.

n  Hollow anchor bar can work as both drill rod and anchor rod, which reduces the two construction steps of retracting drill rod and inserting anchor rod. It simplifies the construction process and effectively improves construction efficiency.

n Self-drilling anchor bolt can be drilled without casing when drilling in soft formations, thus it can greatly improve construction efficiency, shorten the construction period and reduce engineering costs.

n  Hollow anchor bar has continuous thread along the full length, which can be cut at the construction site according to the actual situation and can be extended with a coupler, which is especially suitable for limited access.

n  Simultaneously drilling and grouting, the cement grout can be fully filled and penetrated into the surrounding rock and soil to form a uniform filter cake with higher bonding strength.

n  Rotary percussion drilling method not only drills efficiently but also ensures good directional stability of the drill rod.

As an effective construction technology, self-drilling anchor bolts have been widely used in various engineering projects, especially in special geology such as soft soil layers and easily collapse conditions. It is the best solution for weak soil.