Self-drilling hollow anchor bolts within the extensive range of the Sinorock range of foundation and stability control products are moving beyond their traditional applications in underground construction and are being used also as micropiles. Vital to the protection of infrastructure above underground excavations, the expanded use of the SDA bolt provide efficient underpinning of the foundations of buildings and for stabilizing ground around excavations particularly in hard-to-reach sites with limited working space.
Sinorock hollow bar micropiles can be installed in every ground type and can withstand, reliably, both tension and compression loads of up to 2,750kN in tension and up to 1,910kN in compression. The hollow-bar design of the self-drilling hollow bar micropile system offers a single action for drilling and grouting. As an efficient method of stabilizing the subsoil, micropiling is becoming an ever more important method for preventing settlement of foundations for the long term.
Sinorock self drilling hollow anchor bar overcome these limitations and make the installation faster and more efficient with their one-step process. The bar is drilled into the ground and cement grout is injected through the hollow rod in one operation. During drilling, the grout stabilizes the borehole to prevent it collapsing. Once installed to the required length and after full hardening, the grout transfers the load from the bar into the surrounding soil. The simultaneous grouting ensures full and uniform coverage of grout along the full length of micropile. Extension couplings provides lengthening of the micropiles and the bearing capacity of the connection remains the same as of the bars.