Measure the test taker's knowledge about Hanxin cable.

Culvert cables are not easy to bury and difficult to maintain. The problem can be solved by adopting the steel pipe protection and the reverse buckle of the cable trough.

Signals and cables pass through the culvert and cannot be dug deep and buried as usual. Therefore, the cables are exposed, which facilitates protection, but cannot receive good results. The cable trough and the cover plate are used to protect the Han Xin cable. However, the cover plate of the cable trough is light and easy to fold. The new cover plate is easy to lose or broken into several blocks, the signal cable is exposed again. IF Steel Pipe protection is used, and the method of buried in the rock-ballast will cause the problem that the cable turns and it is difficult to enter the steel pipe.

If the steel pipe protection is adopted for the culvert line cable, the cable trough is also retained on the steel pipe, and the joints and seams of the cable trough are compressed to death with cement mortar, and finally buried with the gravel, good results.

The cable trough is retained on the steel pipe. without increasing the maintenance material and cost, the weight and strength of the cable covering are enhanced, and the joints and seams of the cable trough are compressed to death with cement, A single disconnected cable trough also becomes a whole. Now, as long as the cables are laid in place and quality passes through, the signal cables can be protected for a long time. At ordinary times, only the operator needs to perform some necessary inspections to completely protect the culvert cable.