Self drilling anchor give workers saftey in tunneling

20/gen/2016 11:48:51 metiscn Contatta l'autore

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Ever since the tunneling principals have found industrial acceptance, in particular for unconsolidated/fractured ground conditions, also self-drilling anchors have become an irreplaceable product.

The traditional deep excavation retaining method can not meet the requirement of the stabilization of large-scale underground buildings.

Especially in sandy cobble stratum where the ratio of finishing gas hole is very low, it must lead to high pressure for the grouting and anchoring later and increase the construction cost.

Metis self drilling anchor is composed by anchor head,anchor nut,bearing plate,couplers and so on,which plays a significant role in connecting drilling,grouting,anchoring with each other to make the construction easier and efficiency.

Generally,as an practical and reliable placing solution,self drilling anchor has been extensively applied in the mining,tunneling,foundation support,hydroelectric project and roadway support project and so on,with so many years of exploration and development,the techniques of the installation of self drilling anchor has became skillful and been trusted by our customers around the world.

Grouting is a so critical element to provide strong strength and bonding stress for surrouding rocks,with the whole wrapped of grout,the self drilling anchor can make a perfect effect on the operation of various civil constructions.

The facilitate of self drilling anchor is so easy that it’s the key elements for our agents to choose our anchoring products.We allows customization of self drilling anchor,so the length of rod body can be cut and connected as our customer’s specific requirements.

The Metis self-drilling anchors are part of the excavation process and serve as primary soil/rock support for:

• Radial consolidation of the tunnel circumference supports the rock, forming a load bearing ring thus enabling the rock supporting itself

(together with shotcreate and other facing elements).

• Umbrellas and Fore poling as pre-support in poor rock formation, shallow overburden and critical stress conditions.

• Face stabilization to sustain rock pressure for excavation with large cross sections.

• Root piles to divert stress.

The conventional method of installation involves drilling the self-drilling anchor with water flush to the design layout and depth and in a second phase, independent of drilling, a grout adapter is added and a dense cement based gourt mix is injected through the hollow core to exit through the flush holes at the drill bit filling the borehole annulus until the grout mix appears at the borehole mouth, once cured, enabling the transfer of stress from the rock/soil formation.

If you have any question please don’t feel any hesitate to contact us at any time,we have professional R&D team to offer best and economical drilling solutions,which will make your operations easier and efficient.

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