Expansion shell type hollow rockbolt

It is composed of hollow anchor rod body, steel expansion shell anchor, slurry stop plug, backing plate and nut. With the expansion pressure formed by the shell and rock wall, the installation of anchor can quickly form the support anchor force, control the deformation of rock mass.

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Rockbolt

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Expansion shell type hollow rockbolt

It is composed of hollow anchor rod body, steel expansion shell anchor, slurry stop plug, backing plate and nut.

(1) With the expansion pressure formed by the shell and the rock wall, after the installation of the anchor can quickly form the support anchoring force, control the deformation of the rock mass;

(2) The anchor bolt can be installed and grouted in any direction of 360 °, and the construction process is simple and the grouting is reliable, so that the anchor bolt has permanent supporting force and durability;

(3) can make the anchor grouting body in zero stress or grouting body does not appear cracking through prestressing, to prevent the anchor corrosion in the long-term work.

Hollow anchor body model		Suggested preconditions	Shell pole	mechanical index of anchor rod							Diameter of anchor hole	Remarks
		Suggested preconditions	Limit tensile force value is not less	The ultimate pulling force of the rod body is not less	Elongation	Nominal outer diameter/wall thickness	Weight	Thread direction	Standard length of rod body	Maximum length of anchor rod	Diameter of anchor hole
		KN	KN	KN	%	mm	kg/m		M	m	mm
remarks on shell-expansion hollow grouting anchor	R25/5-A	60	90	180	6	25/5	~2.5	levorotatory	2.5/3/3.5/4/4.5 5/5.5/6/8	More than 12m	42	Commonly used
	R25/4-A	60	90	150	6	25/4	~2.0				42	Commonly used
	R25/5-B	60	90	120	10	25/5	~2.5				42	Commonly used
	R27/5-A	90	120	230	6	27/6	~3.1				46
	R27/5-A	90	120	200	6	27/5	~2.2				46
	R27/6-B	90	120	180	10	27/6	~3.1				46
	R29/7-A	120	140	290	6	29/7	~3.8				50	Commonly used
	R29/6-A	120	140	260	6	29/6	~3.4				50
	R32/6-A	120	180	290	6	32/6	~3.8				65	Commonly used
	R32/5.5-	120	180	250	6	32/5.5	~3.6				65
	R38/8-A	200	280	450	6	38/8	~5.9				70	Commonly used
	R38/7-A	200	280	400	6	38/7	~5.3				70
	R51/8-A	290	400	640	6	51/8	~8.5				85
	1. The mechanical index of hollow anchor rod body is the same as that of RD type hollow grouting anchor rod, and can also be produced according to the technical requirements of users; 2. The diameter of anchor rod drilling has great influence on the prestress of shell expansion anchor rod, so drilling shall be strictly according to the diameter in the table and the specified drill bit shall be used; 3. The suggested prestress value is related to the rock geological conditions of the construction site and the strength of shell expansion anchor, which shall be determined by the design. Its value shall not be greater than the ultimate strength of the shell expansion anchor. It is suggested in the table that the prestress value is determined by the shell expansion strength, and the safety factor K = 1.5. Prestress loss according to different geological conditions, generally between 1.25~1.5, the initial prestress value can take the 0.8 of shell strength.

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