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Hollow bar anchor manufacturers carry out tensile test to ensure the self-drilling anchor rods are strong enough. The values are plotted on a coordinate graph – with strain elongation along the x-axis and stress, typically in MPa, along the y-axis. Figure 1 shows a typical tensile stress/strain curve. Figure 2. Tensile capacity from self-drilling anchor […]

As a manufacturer of self-drilling anchor bars, Onton always pays attention to products from European famous factories. Recently I found one of their hollow bar anchors are a bit different in the terminal chamfer. I won’t evaluate how their process mode is, but will tell why we make the chamfer like this. The normal length of self-drilling

Introduction: The core of the Onton Self-Drilling Anchor Bolt is a hollow, thick-walled, central drilling rod with a drill bit at the top. The system is modular, meaning that the most appropriate configuration can be put together to suit on-site circumstances and the forces that apply. The self-drilling anchor bolts are available in the steel grade S460NH

Introduction Micropiles, sometime are called as minipiles, anchor piles or root piles, are widely used in foundations constructions. Especially for underpinning or emergency repairs, it is an effective method to provide reinforcement. Micropiles normally consist of high-strength, small-diameter threaded steel bar. After the injection of cement, micropiles can supply 1,000 tons strength and more. In

The growth of using self-drilling anchor hollow bar in rock bolting, soil nailing and micropiling is rapid. Self-drilling anchor has been around for at least 40 years. It is developed for tunneling applications in weak or collapsing ground. Until today it is still used for the NEW Austrian Tunneling Method (NATM). However, Unlike the solid

Abstract The foundation of construction support continues to improve to meet the requirements of building and structures, since people began to build constructions. With the expansion of cities, there are not enough support areas near the grounds. Therefore, foundation is designed to transfer load to a suitable bearing earth layer. Buildings influenced by wind and

The story happen in Westeros is very popular in the worldwide. In the history of self drilling anchor bolting developing, same thing is happening. Let’s take a look at these real groups. The founder and former ruler: Atlas copco, first applied SDA Hollow Bars in railways in 1980’s. Basic structure & function: Rope Thread, Tensile Strength,

Origin: The technique of soil nailing began in the 1970’s. It refers to the New Austrian Tunneling Method (NATM), which is a system about underground excavations in rock. It has been successful utilized worldwide for excavation support and slope stabilization, and its using grows rapidly.   Introduction： Most of the time, these anchors are created