How to solve the safety dilemma of overhead line construction

The construction of overhead transmission line project is characterized by "many points and wide areas, large amount of high-altitude work, most of which belong to field work and long construction period", which determines that it has high construction safety risk and control risk. First of all, we will talk about the technology that Xiaobian is good at (corresponding to the "method" of the five elements), and how to reduce the construction safety risk and protect the construction safety through technical innovation and technical means.

Significance of technology to construction safety

Technology is not an end, but one of the important means to achieve the goal. Technology plays with the brain, and the investment cost is low and the return is large, which is very worthwhile.

For overhead transmission line project, the construction process is relatively simple and clear. There are three major processes: Foundation → tower erection → stringing. Even though the voltage levels are different, the basic process of construction technology is not different. Generally speaking, the construction technology of overhead bare conductor is not high. It is unrealistic to carry out subversive technical innovation or process innovation. It is more likely to rely on the improvement of materials and equipment. So, what can technology do in terms of construction safety assurance? I think we should cut in from the aspects of optimizing engineering design, improving efficiency, reducing labor intensity, reducing work at height, and improving working environment. The following is an example of the small part.

One of the technical guarantees: Design Technology

In terms of ensuring construction safety, the design can do little.

• when selecting the route, it is best to consider the subsequent construction and avoid dangerous terrain or areas if conditions permit.

• In terms of foundation type selection, the foundation type with low construction risk, such as cast-in-place pile, shall be adopted as far as possible to avoid the risk of foundation pit collapse when the cost index permits.

• During tower design, necessary construction holes and hanging points of holding pole supporting rope shall be reserved according to construction needs; During construction in mountainous areas, the design shall reasonably cut off the tower materials, and the single tower material shall not be too long to facilitate transportation, especially the ultra-high pressure steel pipe tower.

• For crossing power lines, highways, railways, etc., the span shall be shortened as much as possible, the towers on both sides shall be raised, and the crossing objects shall be as close to one side as possible, so as to create favorable conditions for network closure. If necessary, local reinforcement or additional hanging holes shall be carried out for the poles and towers in combination with the needs of crossing and network closure and the rationalization suggestions of the construction unit.