Installation of Self-Drilling Grouted Anchors

This technology allows for simultaneous drilling, cement grout injection, and borehole reinforcement, including in areas with limited access for heavy machinery.

The entire anchor installation process takes place in a single technological step. The rod simultaneously serves as the drilling and injection drive. Immediately upon the start of drilling, an initial injection of pressurized flushing cement grout is performed. Penetrating the soil structure, the cement grout stabilizes the borehole walls, eliminating the need for casing pipes. At the same time, the rod along with its connectors (couplings) remains in the borehole, functioning as the central reinforcement of the pile. Centralizers are used to ensure the protective cover and the design position of the rod.

In some cases, the use of standard piling technologies with heavy machinery is impossible. For the installation of self-drilling grouted piles from assembled rods, compact equipment is used, capable of installing such piles in building basements, between railway tracks, and under bridges and overpasses.

The anchor type, diameter, and length are selected based on the calculated loads and the geological and geomorphological conditions of the site.

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Technical Specifications

Rod Designation (R/N)	Outer Diameter Including Thread (R), mm, ± 10%	Inner Diameter (N), mm, ± 10%	Yield Strength, MPa, min	Breaking Load, kN, min	Unit Weight, kg/m, ± 10%
R38/N21	38	21	640	505	4.89
R38/N20	38	20	620	515	5.18
R38/N18	38	18	650	560	5.47
R38/N15	38	10	620	610	5.47
R40/N30	40	30	580	320	3.92
R40/N20	40	20	560	580	5.58
R40/N18	40	18	580	615	6.66
R40/N16	40	16	580	660	7.07
R40/N12	40	10	580	710	8.32
R41/N21	41	21	580	590	7.14
R41/N18	41	18	580	625	7.28
R42/N20	42	20	550	630	7.28
R42/N22	42	22	550	695	7.17
R42/N25	42	25	550	620	6.38
R52/N26	52	26	570	930	9.96
R51/N36	51	36	640	800	7.57
R51/N30	51	30	620	935	9.06
R51/N28	51	28	610	960	9.37
R73/N56	73	56	600	1000	10.76
R73/N53	73	53	550	1150	13.95
R73/N35	73	35	530	1850	21.11
R103/N77	103	77	550	2200	24.81
R103/N50	103	50	450	3600	43.63
R105/N78	105	78	530	2150	26.5
R105/N52	105	52	500	3600	51.08
R135/N83	135	83	500	4800	69.59

solutions

Drill-injected anchors - Applications

Drill-injected anchors are widely used as part of comprehensive engineering protection systems against hazardous geological and man-made processes.

Solution

Debris Flow Barrier

Flexible debris flow barriers made of ring nets to stop debris flows and retain solid matter. They can be installed across the channel either individually or as a cascade of barriers one after another, with or without intermediate posts.

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2D-GEO Slope Stabilization and Rockfall Protection System

The 2D-GEO system for the engineering protection of slopes, embankments, and shores against landslides, rockfalls, and soil collapses.

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Rockfall Protection Barrier

Flexible rockfall barriers based on ring nets to protect people and infrastructure from falling rock debris.

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Snow Retention Barriers

Flexible modular snow retention barriers. Installed in the avalanche starting zone, they hold the snowpack in place and prevent movement within the avalanche release area.

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