The raising standard of self-drilling anchor hollow bar

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.. read more →

03 Jun 2023
0 Comment

Drilling Anchor System

Drilling Anchor System -Technologies in Construction and Underground Mining 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… read more →

Coupling for Anchor Bars, end chamfering process

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.. read more →

20 May 2023
0 Comment

What a tensile stress/strain curve tells

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 1. Tensile Stress/Strain Curve Figure 2… read more →

13 May 2023
0 Comment

What should we concern when purchasing self-drilling anchor?

Experienced buyers may find there is a difference in the model types of self-drilling anchor among all suppliers. Naming methods Atlas MAI (now belongs to Orica) self-drilling anchors are identified by the combination of alphabets & numbers. For instance, R32N R means the rope thread. 32 is the outer diameter of hollow bar. N represents.. read more →

06 May 2023
0 Comment

Soil Nails & Rock Bolts Anchoring

Origin: The technique of soil nailing began to evolve in the early 1970’s. It developed from the New Austrian Tunneling method which is a system for underground excavations in rock. It has been successful utilized worldwide for excavation support and slope stabilization and its use continues to grow rapidly. Introduction: Most of the time, these.. read more →

A history of Self-Drilling Anchor (Game of Thrones version)

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.. read more →

25 Feb 2023
0 Comment

Micropile Reinforcing System and Corrosion Protection

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.. read more →

18 Feb 2023
0 Comment

Micropiles, Rock Drilling Rigs and Hollow Bar Anchors

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.. read more →