How to Prevent the Corrosion of the Self Drilling Anchor Bolt System?

In many geotechnical anchoring projects, it is very common to use a self-drilling anchor bolt system to support slopes, foundation pits, tunnels, etc. The main material of the self-drilling anchor bolt system is steel, which is easily corroded in the environment, and the service life of the bolt will be greatly affected, which will lead to the decline of engineering quality and safety hazards. So, how to prevent corrosion in the construction of a self-drilling anchor bolt system? Today, Sinorock will introduce you.

Everyone should be familiar with the self-drilling anchor bolt system. It is a kind of hollow anchor rod, which is both a drill rod and an anchor rod. At the same time, it can also be grouted through the hollow rod body. The grout is ejected from the grout hole of the drill bit and fills the cracks and drilling holes in the formation around the anchor rode from the inside to the outside. It is a new type of support technology that integrates the three functions of drilling, grouting, and anchoring. Self-drilling hollow bolts do not require casing wall protection during construction. Therefore, they are very suitable for the treatment of geological diseases such as the bottom layer of loose, broken, and easily collapsed holes, reinforcement of existing structures, and grouting to fill cracks.

The specifications of self-drilling hollow bolts are 2m, 3m, 4m, 6m, and the whole body has continuous threads, which can be cut at any position or socketed with an equal-strength connection. It is more suitable for basements, bridge bottoms, riversides, narrower It is widely used in tunnels, mines, slopes, and other projects.

After the self-drilling hollow bolt is constructed, the slurry will wrap the whole body of the rod, which can isolate the external environment to a certain extent and play a certain anti-corrosion effect. However, this preservative effect depends on the fullness of the slurry and is uncertain. Therefore, in the process of self-drilling hollow bolt production and processing, there is a professional anti-corrosion technology.

First, the epoxy coating is sprayed on the surface of the rod body, drill bit, and other components, and the contact between the component itself and the outside world is isolated by the coating of the epoxy coating, so as to achieve the effect of anti-corrosion. This anti-corrosion process is mainly suitable for the occasions where the formation and groundwater contain sulfides and chlorides and are eroded by seawater, as well as in environments with stray currents or aggressive media.

Second, after the rod body, drill bit, connecting sleeve, and other components are processed and formed, the surface is galvanized by a hot-dip galvanizing process to prevent the direct contact of the external environment to each component, and it can also prevent electrochemical corrosion of the components. The anti-corrosion process is especially suitable for various corrosive environments such as acid and alkali mist, as well as occasions with high requirements on service life and complex environments in the field of geotechnical engineering.

The geotechnical anchoring project supported by self-drilling hollow bolts is regarded as a "hidden project", and its anti-corrosion effect mainly depends on the effective implementation in engineering practice. Therefore, the construction process should be strictly implemented in accordance with the relevant regulations, in order to achieve a relatively ideal anti-corrosion effect, in order to ensure the quality of the project.

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Created on Jan 14th 2022 03:09. Viewed 189 times.

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