Hollow Self-drilling Anchor Bolt

Hollow Self-drilling Anchor Bolt :

Applications :The product is mainly used for weak rocks, loose soil, weathered layer, sand with stone layer and so difficult to create a hole in complex formation. In forepoling of the tunnel and a variety of slope retaining in the supporting work well to reach the ideal support effect.For permanent anchor bolt(soil nails) applications, we provide two practical means of extending the life of the nail in the critical area at the soil / air interface: the one is Hot-dip Galvanizing (according to BS EN 1461),the other one is Hot-dip Galvanizing+powder coating.Features :1. Self-drilling anchor bolt have two performances :one is drilling ,the other is grouting. The anchor bolt have these features: reliable, efficient and convenient construction.2. In a variety of complex formation of the anchoring effect are excellent.3. It emphasized that close to the rock surface of flexible support systems to better play to their strength of rock, restraining deformation of surrounding rock, restoration of surrounding rock stress balance.

II.Products specifications and types

	Outside diameter	Average internal diameter	Ultimate load capacity	Yield load capacity	Average tensile strength Rm	Average yield strength Rp0,2	TheoricaI weight	Thread type
	mm	mm	Kn	Kn	N/mm2	N/mm2	kg/m
R25N	25	13	200	150	720	560	2.4	ISO 10208
R32N	32	18.5	280	230	720	560	3.2
R32S	32	15	360	280	740	560	4.0
R32L	32	20	220	160	740	560	2.9
R38N	38	19	500	400	740	560	5.8
R51L	51	36	550	450	740	560	6.8
R51N	51	33	800	630	740	560	7.8	ISO 1720
T76N	76	51	1600	1200	740	560	15.6
T76S	76	45	1900	1600	740	560	20.0
T30/11	30	11	320	260	740	560	3.2
T40/16	40	16	660	525	740	560	7.2
Delivery lengths	1m, 1.5m, 2m, 2.5m, 3m, 3.5m, 4m, 4.5m, 5m, 5.5m, 6m

Hollow Self-drilling Anchor Bolt