Self drilling hollow rockbolt

It is composed of hollow anchor rod body, self-feeding drill bit, slurry stop plug, backing plate and nut. Bolt installation relies on the support resistance after the deformation of the surrounding rock formation, which belongs to the passive support type bolt. It is mainly used for permanent system support and advance pre-support in weak surrounding rock such as broken rock and loose soil layer.

Classification:

Rockbolt

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Self drilling hollow rockbolt

Hollow anchor body model		Mechanical index of anchor rod * *						Diameter of anchor hole		Remarks
		The ultimate pulling force of the rod body is not less	Nominal outer diameter/wall thickness	Weight	Thread direction	Standard length of rod body	Maximum drilling depth	Cross bit SZB	Sand bit STB
		KN	mm	kg/m		m	m	mm
Self-advancing hollow grouting bolt system	S25/5-C	210	25/5	~2.5	levorotatory	2/3/4/6	8	42	65	Commonly used
	S25/5-A	180	25/5	~2.5				42	1
	S27/6-C	250	27/6	~3.1				42	65
	S27/6-A	230	27/6	~3.0				42	1
	S29/7-C	300	29/7	~3.7				46	75
	S32/6-C	310	32/6	~3.8			12 16	50	75	Commonly used
	S32/6-A	250	32/6	~ 3.8				52
	S32/8-A	450	38/8	~ 5.9				75	90	Commonly used
	S51/8-A	640	51/8	~ 8.5				80	110
Remarks	1. The special specifications of the anchor rod can also be produced according to the user's requirements. 2. The size of the anchor rod drilling should be determined according to the actual geological conditions of the formation.

* For rock conditions. In different soil conditions, the diameter of the anchor bolt shall be determined according to the anchoring requirements. * * anchor mechanical indicators and technical parameters can be changed according to user needs.

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