What Is a Cable Bridge Making Machine?

What Is a Cable Bridge Making Machine?

A cable bridge making machine is a machine used to form and install cables on suspension bridges.cable bridge making machine It consists of a large, heavy steel frame (sometimes referred to as a spool) with an array of radially-positioned jacks. The jacks are used to compress bundles of wire, which are then wrapped in steel cable. Once the requisite number of bundles has been formed, a special cable-squeezing machine is used to form a complete main support cable for the bridge.

Suspension bridges are designed to rest on long cables that are suspended from towers at both ends of the bridge.cable bridge making machine The cables are fabricated in advance of construction and then transported to the site and installed. They provide the bridge with its lateral strength and flexibility, and they also help distribute the weight of the deck onto the supporting towers.

The design of a suspension bridge is determined by the load-bearing ability of the supporting cables, and the way they are suspended from the bridge's towers. These factors are important in determining the bridge's stability, a crucial factor in safety for both passengers and pedestrians on the bridge.

Early forms of suspension bridges typically employed ropes for the cables; this is still in use on a few structures, such as the Dryburgh Abbey Bridge, Bath (1836) and the Victoria Bridge, Bath (1839). Roebling's innovations in 1826 were a key step toward using wrought-iron cable for supporting the bridge.

He discovered that wire strands worked much better than chains for forming the cables. Roebling also developed a method for spinning the wire strands into cable in place rather than transporting them prefabricated from a workshop and laboriously assembling them on the bridge.

In the case of the Golden Gate Bridge, workers assembled 290 parallel wire strands and shaped them into the 1.12-meter-diameter cable needed to support the bridge's two towers. This process took two months and was done under the supervision of a trained crew that performed all the work without any injuries or accidents.

A major advantage of this technique was that the construction was done under controlled plant-like conditions at a specially built construction yard, where workers could watch the wire formation and ensure it met the required specifications. This technique also saved money by allowing for reuse of the precasting formwork that was used to construct the bridge segments.

This type of construction method is often the most cost-effective for long spans and can be addressed to both simply-supported and continuous-span bridges. It is compatible with the use of external post-tensioning, and it provides a more stable structure for the cables.

The equipment used for this method of construction is similar to that used for in-place casting with the exception that it is usually erected and installed on a single span. Erection equipment is grouped into three categories based on the bridges' design.

Span-by-span erection is the most common and easiest method for constructing precast segmental bridges, and it addresses spans with maximum gradients of up to 4-5%. The equipment for this method is primarily a gantry system consisting of lifting frames, cable cranes and lifting platforms, but there are also self-launching gantries and special travellers for arches and cable-stayed bridges.

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