Information On Strand Jacks And Their Uses

In the construction of large projects such as buildings and bridges, it can become necessary to lift heavy loads for which standard cranes are impractical. Strand jacks are specialized hydraulic jacks that are able to move more weight relative to their size than other cranes can.

Hollow hydraulic cylinders are used in this 1970's invention to house dependable steel cables. By opening and closing the cylinder, the operator can move the position of two anchors along the cables. Like pulling a rope through your hands, moving it down with one hand and locking it in place with the other, the anchors inch the load in either direction.

Whereas standard cranes can weigh upwards of several hundred tons, these tend to weigh just a fraction of their counterparts. As a result, a single man can control massive weights. Maneuverability is also a benefit, as its compact size allows this specialty crane to work in restricted spaces.

It lends itself to incredibly precise maneuvering as well because the operator can manipulate speed and motion, pausing the action when necessary. Commonly, though, more lifting ability is needed than a single strand jack can offer with its one thousand ton capacity. In these circumstances, about forty strands can be connected, multiplying its strength many times, up to around forty thousand tons. This unbelievable ability is then controlled by a computer for improved accuracy.

Substantial bridges and large buildings are the types of projects that tend to require this concentrated power. Though many would not realize it, most have probably seen such creations at least once. One example is the Allegheny Bridge found in Pennsylvania, which called in the help of four 85 strand jacks. Out in the west, in Hawaii, the Kealakaha Stream Bridge also used the tool.

In the oil industry, the lifting tool is primary seen in moving pieces for future transport, such as platforms or other rig and refinery pieces. It is also present in the construction of off-shore machinery.

Tourist attractions and specialty buildings have even used the jacks in construction. U2, in its "360" tour, created an elaborate stage that required them. The Millennium Wheel, or London Eye as it is more commonly know, has a similar story.

In just about any construction situation, strand jacks have a potential purpose. They complement standard cranes quite nicely as they are able to be used where cranes are not. It might be too dangerous, too small, or too heavy for other tools, but not for the strand jack.