Strand Jacks Lifting|hydraulic power jack system

Strand Jacks Lifting|hydraulic power jack system

Use of strand jacks lifting:
Strand jacks can be used horizontally for pulling objects and structures, and are widely used in the oil and gas industry for skidded loadouts. Oil rigs of 38,000 t have been moved in this way from the place of construction on to a barge. Since multiple jacks can be operated simultaneously by hydraulic controllers, they can be used in tandem to lift very large loads of thousands of tons. Even the tandem use of two cranes is very difficult operation
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Product Details

Description of strand jacks lifting:

The strand jack lifting technique originates from the concrete post tensioning principle. A strand jack can be considered a linear winch. In a strand jack, a bundle of steel cables or strands are guided through a hydraulic cylinder; above and below the cylinder are anchor systems with wedges that grip the strand bundle. By stroking the cylinder in and out while the grips are engaged in the anchors, a lifting or lowering movement is achieved.

The motion of the cylinders is driven by hydraulic power packs. They can be electric or diesel powered. Our sophisticated SCC software program synchronizes the motion of the strand jacks and adjusts the motion to the loads per lifting point

strand jack lifting system.jpg    hydraulic strand jack system22.jpg

Working principle of strand jack lifting

The high tensile strands used in strand jacks are of the same solid wire seven piece construction as used in pre and post tensioned concrete. These strands are often run through an additional manufacturing process to reduce their diameter further by flattening/rounding slightly the outer wires to give the strand more circumferential contact area(Figure 1).The reduction of diameter means more strands can be utilised within a given area although the sectional areas are the same. More contact area with the collects and hence less wear.

Below Figures demonstrates the principle of operation of a strand jack when raising a load. For clarity only one strand has been shown in the diagram. For clarity only one strand has been shown in the diagram. The capacity of a strand jack is directly proportional to the number of strands used. For example, strand numbers can rance from a single strand to 55 strands in a 6600KN jack. Strands are usually 15.2MM in diameter although 18MM diameter strands are sometimes used.The yellow and green sections indicate a hollow hydraulic ram while the black shaded area represents high pressure hydraulic oil. The collets are shaded red and the mating collet housing is shaded blue.

strand jacks lifting


Parameters of strand jacks lifting

model

Safe working load

Working pressure

MPA

Cylinder stroke

mm

Retraction height

mm

Jack weight

KG

Fixed anchor weight

KG

boost speed

m/h

Number of strands

Strand diametermm

ZT-TSD15

15

31.5

500

1846

148

3.2

0-25

1

18

ZT-TSD45

45

31.5

500

1726

600

28

0-25

3

18

ZT-TSD60

60

31.5

500

1726

630

32

0-25

4

18

ZT-TSD100

100

31.5

500

1790

930

46

70-25

7

18

ZT-TSD180

180

31.5

500

1886

1560

90

0-25

12

18

ZT-TSD280

280

31.5

500

1938

2330

130

0-25

19

18

ZT-TSD300

300

31.5

500

1940

2460

140

0-25

20

18

ZT-TSD400

400

31.5

500

2100

3396

220

0-25

27

18

ZT-TSD580

580

31.5

500

2220

4980

260

0-25

38

18

ZT-TSD680

680

31.5

500

2180

5410

320

0-25

45

18

ZT-TSD800

800

31.5

500

2200

6880

360

0-25

54

18

ZT-TSD1000

1000

31.5

500

2286

8520

560

0-25

66

18

factory of strand jack liftiing

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