The evolution of the form and structure of the pollution prevention buoy . Pull a steel wire rope (40mm) diagonally along the river 100m ~ 500m in front of the water intake of the unit. The rope length is about 400m. In a bundle), as a pollution prevention facility, it is called a bamboo tube type pollution prevention buoy. Later, in order to improve the pollution prevention effect and service life, the bamboo was replaced with welded steel pipes (300mm) and trash racks. 35 welded steel pipes were attached to steel wire ropes, each of which was 12m long. The plate is blocked, a "U" shaped pull ring is welded on the iron plate, and a shackle connection is used between the two steel pipe pull rings. Weld the trash rack on the steel pipe below the vertical water surface. The size of the trash rack is 12m × 1m. The material of the trash bar is made of angle steel and round steel bar, which is called steel tube type trash buoy.
During the flood, the flow is large. In order to meet the requirements of flood control, the reservoir should be lowered to run upstream. The flow pattern before the water intake of the unit will become very poor. The river will continue to roll over. The connection was also broken several times, and the connection between the steel pipe and the wire rope was also broken, but the 40mm wire rope was not broken. Through careful analysis, the connection between the steel pipe and the steel pipe is the first force applied to the above structure when the entire buoy is stressed, and the steel wire rope is not the main stress point. In order to make the steel wire rope (40mm) play the main role of stress, the shackle connection between the steel pipe and the steel pipe was changed to a steel wire rope (16mm) connection, and the steel wire and the steel wire rope (40mm) were bound by a steel wire rope (16mm) connection. The advantages and disadvantages of the two forms and structures are the bamboo tube structure. The cost is low and the investment is small. The investment is about 150 yuan per m. The service life is short, and only a small amount of floating objects can be blocked. Or if it turns over below, the effect of blocking floating objects is too poor. Steel tube structure, high cost, large investment, investment of about 1500 yuan per m, long service life.
It can block most floating substances and a small amount of suspended substances. When the water level of the reservoir is low, the flow pattern of the water flow is very poor, and the pollution blocking effect is poor at this time. Cleaning and structure optimization of the trash rack The trash buoy has played a considerable role after several years of operation, reducing the blockage of the trash rack of the water intake of the unit and reducing the company's power generation losses. But there is always a part of the suspended matter in the water to flow to the water intake of the unit, blocking the trash rack, so the cleaning of the trash rack is an unavoidable task.
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