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Seven Mile Dam, Southern BC, Canada

Dublin Port Tunnel, Ireland

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Repair & Strengthening

: CFRP Hollow-Piston Cylinder 1407 kN/250

DYWIDAG Strand Anchors

Light Weight Hollow-Piston Cylinders for Prestressing Jacks

CFRP Hollow-Piston Cylinder (maximum pressure 700 bar)

In comparison to normal steel hollow piston cylinders, CFRP Hollow-Piston Cylinders offer the convenience of up to 60 % less weight. This enormous advantage is realized particularly with mobile applications as well as during manual handling.

Heavy lifting equipment for transport and assembling of the cylinders can be omitted in most situations.

The ultra-light weight CFRP-cylinders allow a simple and efficient workflow. These cylinders have an integrated overflow valve which opens when the piston is completely extended. The fixing of the cylinder lid is unable to stand the full piston force.

The CFRP hollow-piston cylinders can be connected with auxilliary wedge setting devices or stressing chairs for ground anchors.

Selection from our product range (more series available on request)
Species	Compressive Force	Stroke	Passage	Mass	Piston Area	Assembly Dimensions (B) x (C)	Series
	[kN]	[mm]	[mm]	[kg]	[cm²]	[mm]
80 t	891	200	75	23	127,5	190 x 380	L-HK-DZ-080-200-075-HP
100 t	990	200	83	25	141,4	190 x 405	L-HK-DZ-100-200-84-HP
120 t	1187	180	90	28	169,6	215 x 397	L-HK-DZ-120-180-090-HP^*
140 t	1407	250	105	39	201,1	235 x 458	L-HK-DZ-140-250-105-HP
170 t	1781	180	110	49	254,5	260 x399	L-HK-DZ-170-180-110-HP
200 t	1917	180	150	61	273,9	324 x 413	L-HK-DZ-200-180-150-HP
320 t	3149	150	100	62	449,8	324 x 380	L-HK-DZ-320-150-100-HP
^* Standard-Cylinder available ex work

CFRP-lightweight prestressing jacks with integrated wedge setting device

For smaller tendons, CFRP-prestressing jacks with integrated wedge setting device are used. This piston saves space and provides a non-slipping anchorage of tendons or ground anchors. An additional hydraulic connection is necessary. The withdrawal of the wedge setting piston happens automatically during the stressing operation.

For testing ground anchors, stressing chairs can be supplied to maintain the anchoring of ground anchors after testing, together with the hydraulic wedge setting piston. For servicing, portable and mobile hydraulic aggregates are available.

Selection from our product range (more series available on request)
Species	Compressive Force	Stroke/wedging stroke	Passage (A)	Mass	Piston Area	Assembly Dimension (B) x (C)	Number of Strands	Series
	[kN]	[mm]	[mm]	[kg]	[cm²]	[mm]	max.
110 t	1100	250/20	85	37	167,8	215 x 600	7 x 0,5 5 x 0,6	CFK 1100/250/20/085/70-403.00
160 t	1600	250/20	105	55	237,0	260 x 600	9 x 0,5 7 x 0,6	CFK 1600/250/20/105/70-403.01
210 t	2100	250/20	118	65	303,7	290 x 600	12 x 0,5 9 x 0,6	CFK 2100/250/20/118/70-403.02

CFRP-lightweight prestressing jack with attached wedge setting cylinder

CFRP-lightweight prestresing jack with displacement measuring device