What are the laying methods and construction techniques of the cable line in the project?
Direct buried cable line laying construction method:The first is to dig the cable trench: the cable laying underground is to dig a ditch about 0.8m deep in the ground, and the width of the ditch is 0.6m. When the bottom of the ditch is flat, fine sand with 100mm thickness is used as the cushion of the cable.The laying of cables is generally divided into two types: manual laying and mechanical traction. For laying cable specifications smaller, two groups in substation cable trench on both sides, carrying the cable tray laying along the direction of the slow progress, will gradually release the cable reel into the trench, for all kinds of mechanical traction cable in cable ditch, every two meters placed a pair of roller rack arranged on the cable; ditch the end, at the other end placed hoist or winch, to 8~10 M / min per speed of the cable is pulled out, fell on the roller, and then withdraw from the roller, the cable loose deposited in the ditch, in order to expansion. In the cable and then covered with 100mm thick soft soil or sand, covered with clay brick or concrete cover, cover width should be more than the diameter of the cable on both sides of 5Omm, finally fill in the cable trench, covering up to 150 ~ 200mm in the ground, and both ends of the cable line, turning and indirect head erected marking piles.After doing the intermediate joint and the terminal head, the cable construction will be completed, and the relevant tests must be carried out before delivery.
There are many kinds of laying methods for cable lines, such as direct buried laying, cable trench laying, cable tunnel laying, pipe laying and indoor and outdoor laying. The construction method of direct buried cable laying is described briefly.
Technical requirements for laying cable lines:Clear the line direction, according to the distribution requirements and design drawings to determine its direction;The embedment depth shall be in the depth of 0.7m underground, and should be buried in the depth of 1m underground when it is close to other cables or with other pipelines;The bottom of the directly buried cable trench must be smooth or paved with a thick layer of 100mm fine soil at the bottom of the ditch and equipped with a sign on the ground;The protection of wear casing cables across the road;The metal sheath of armored and lead sheathed cables must be grounded at both ends.
