The Cable Bridge Making Machine

The Cable Bridge Making Machine

The cable bridge making machine is a device used to construct suspension cables for bridges.cable bridge making machine The process involves spinning a number of thin wires to create a cable with a large diameter and high strength-to-rigidity ratio. Unlike traditional cable erection, where cables are strung on the structure, this technique was developed to make the construction of suspension cables fast and efficient.

In 1935, the company that was building the Golden Gate Bridge, John Roebling and Sons, devised a method of creating large suspension cables.cable bridge making machine The company was already known for its engineering work on many of the world's longest bridges.

A huge steel supporting frame was constructed to anchor the strands of the main cables. The strands were then bound together by thousands of thin wires that are about the size of pencils, and a hydraulic press compressed them into one large cable.

Once the strands had been secured, they were pulled up and over both towers of the bridge by a wheel. The wheel was attached to a fixture called a strand shoe. Once the wire reached the opposite shore of the Gate, it was firmly secured onto the strand shoe, and the wheel returned with another loop of wire to begin the process again.

There are many ways to assemble suspension bridges, but the most efficient is through the use of an erection machine that can lift and lower each strand at a predetermined height, thereby reducing the risk of cable failure due to slippage or fatigue. In addition, this technology allows for precise sag adjustment of the strands.

The sag of the cable strand, regardless of its type of erection, is crucial to controlling the overall cable shape and achieving desired results for the design. The main cable sag control method consists of three stages: adjusting the length and the sag of the main span, adjusting the length and the sag at the side span, and adjusting the sag of the general strands.

Various constructional conditions may have an effect on the sag of the cable strands, and the influence degree of each factor depends on its significance. For example, the sag of a strand can be adjusted by controlling the absolute elevation of the reference strand and the inter-strand distance between strands.

When a suspension bridge has a span greater than two kilometers, it is difficult to alter the shape of the cable once a bridge has been erected. Therefore, it is necessary to ensure that the final main cable shape reaches the expected alignment through reliable calculation parameters, accurate calculation methods, and strict construction quality control.

This article reviews the research progress on the control of the suspension bridge’s main cable shape, and summarizes both current shortcomings and future research directions. In particular, the research on three aspects of main cable shape-finding, construction control technology, and control analysis was reviewed.

The research on the main cable shape-finding method, as well as the construction control technology and the control analysis, has achieved significant progress in recent years. Despite this, however, some research gaps still remain. Specifically, the main cable shape-finding method needs to be improved by developing a new method that is more accurate and efficient. Moreover, the construction control technology and the control analysis must be improved to enhance the accuracy of the main cable shape.

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