Method for improving cable service life by vacuum pumping and nitrogen injection after construction of stay cable
A technology of stay cables and nitrogen filling, which is used in the erection/assembly of bridges, bridge construction, bridge maintenance, etc., can solve the problems of loss, shorten the service life of stay cables, and corrosion of steel wires, and achieve the effect of improving service life.
Inactive Publication Date: 2009-04-01
JIANGSU FASTEN STEEL CABLE CO LTD
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Problems solved by technology
[0003] Before the present invention was made, there was also a method of flushing nitrogen gas into the cable body during the factory manufacturing process, but the nitrogen gas in this method would be lost when the stay cable was coiled, transported, and erected. It will enter the cable body and stay in the cable body to form steel wire corrosion, shortening the service life of the stay cable
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[0012] see figure 1 , The invention relates to a method for increasing the service life of the stay cables by vacuuming and filling nitrogen after the stay cables are erected. The method is that at the bridge construction site, after the stay cable is erected, if the stay cable is damaged, first repair the damaged part of the stay cable with an extrusion welding torch. If the stay cable is not damaged, it does not need to be repaired, and then Open a pumping hole on the stay cable at a distance from the beam end, connect it to a vacuum pump, first evacuate the inside of the stay cable, and pump out the water and oxygen trapped in the stay cable body during coiling, transportation, and erection. Such as image 3 . Then filled with nitrogen, such as Figure 4 . And repair the air hole with extrusion welding torch.
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The invention relates to a method for prolonging the service life of stayed cables by vacuumizing and filling nitrogen after the stayed cables are set up, which is essentially applied to the anti-corrosive protection of the stayed cables. The method is used in construction site of bridges and after the stayed cables are set up, an extrusion-type welding gun is firstly used for repairing damages of the stayed cables if the stayed cables have any damages. Provided that no damages are caused to the stayed cables, repair is not required. And then the stayed cables which are at a certain distance from the ends of the bridge are provided with air extraction holes, and a vacuum pump is connected to firstly vacuumize the interior of the stayed cable and extract water and oxygen in cable bodies, and then nitrogen is filled into the cable bodies and the extrusion-type welding gun is used for repairing the air extraction holes. By the adoption of the method, water can be prevented from entering the cable bodies so as to carry out the anti-corrosive protection to the stayed cables, thereby prolonging the service life of the stayed cables.
Description
(1) Technical field [0001] The invention relates to a method for increasing the service life of the stay cables by vacuuming and filling nitrogen after the stay cables are erected. Mainly used for anti-corrosion protection of stay cables. It belongs to the technical field of bridge engineering. (2) Background technology [0002] Before the present invention was made, traditional stay cables were protected against corrosion by hot-extruding high-density polyethylene in the factory. The method can meet the service life of the stay cable in mechanism. However, because high-density polyethylene is a flexible material, the stay cable is prone to damage during coiling, transportation, and erection, and enters the cable body before the technicians find it, causing water to enter the cable body and stay in the cable body, such as Figure 2 shows. By interacting with oxygen in the cable body, steel wire corrosion is formed, which shortens the service life of the stay cable. [00...
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Inventor 薛花娟山崎伸介周祝兵
Owner JIANGSU FASTEN STEEL CABLE CO LTD