The fore-cramp type jack is a kind of multipurpose prestressing equipment. It is easy to operate and maintain.

The fore-cramp type jack is a kind of multipurpose prestressing equipment. It is easy to operate. It is mainly used to stretch single hole. It is also used to multi-hole pretension, stretch and debug. It is suit for all kinds of high strength steel wire bundles and strands.

Model		Nominal hydraulic	Area of stressing cylinder	Return hydraulic	Stroke ofstressing	Diameter of  minimum centre hole	Overall dimension	Mass	Minimum working    space	The reserved length of strand
	KN	Mpa	mm2	Mpa	mm	mm	mm	kg	mm	mm
QYC270	270	62	4400	<10	200	Φ17	Φ114×529	24	750×110	220

fore-cramp type jack for prestressing concrete