2017年06月28日

Power hollow anchor bars

The construction method of self drilling anchor bar characterized by rapid construction has been successfully used in the construction of Beijing Metro Line 4, which has won valuable time for Olympic construction projects.

In unconsolidated/fractured ground conditions, self drilling hollow bars have become an irreplaceable product.

Sinorock® Self Drilling hollow bars 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 shot-create and other facing elements).

• Umbrellas and pore 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 Sinorock® Self Drilling hollow bars 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 grout 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.





Posted by seo2@sinorockco.com at 13:30│Comments(0)TrackBack(0)

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