Prefabricated wiring construction technology is a special wire construction and installation process that is different from conventional wiring construction technology. Prefabricated wiring is a wiring process in which wire prefabricated components are made according to the length of the tension section, and the tension section wires are pre pressed with tension clamps on the ground for direct deployment and hanging. The precise production of prefabricated wire components will directly affect the assembly quality. During the tightening process, the wire will experience certain structural and elastic elongation when subjected to tightening tension. Therefore, in the implementation of assembly type stringing technology, a pre tension needs to be applied to the wire, taking into account the impact of initial elongation on the length of the wire, in order to ensure that the wire sag meets the requirements of the specifications. The function of the device introduced in this article is to cut the required length of wire under certain tension conditions..

At present, there are various ways to control the length of wires. Usually, factories can use two methods to measure the length of factory wires: roller type and laser length measurement. However, neither of these methods takes into account the influence of temperature and tension factors on the length of wires, and the measurement accuracy level does not meet the requirements of assembly type wiring technology. The assembly type overhead wire precise measurement device introduced in this article is controlled by a total station in terms of length measurement accuracy..

Wrap the wire around the device, connect the wire with a tension gauge and a lever hoist for anchoring at the beginning and end respectively. According to the design documents, calculate the wire tension based on the completed sag at the site temperature during tensioning. Apply this tension to the wire using the lever hoist, keeping the tension gauge readings on both sides the same, and keep it stationary for a certain period of time to ensure that the wire in the device is in a suspended state; The tension gauges at both ends of the wire need to be adjusted in real-time to maintain consistency with the initial tension..

The spacing between the double layer rollers of the supporting device is set according to the inner diameter of the pulley, ensuring that the upper and lower layers of wires are horizontal and avoiding wire sagging that affects the accuracy of length measurement; The frame needs to be positioned and leveled in advance, and ground fixing measures should be taken..

The distance for assembling the gear is relatively long, such as pre tensioning a single wire, which requires a large site and cannot guarantee that the stress conditions of each wire in “multi split” are the same. According to the principle of pulley groups, two frames are made based on two five wheel pulleys, and the wires are wound on the five wheel pulleys to obtain a structure with two layers and balanced stress, The tension of a single wire can be achieved by using a chain hoist to connect tension gauges in series (connecting tension gauges at both ends to ensure the same tension), as shown in Figure 1..

The main structure of the precise wire measurement device is shown in Figure 2. Figure 2: 1 shows the sliding frame; 2 is the lifting ring; 3 is a pulley; 4 is the bearing seat; 5 is the support frame; 6 is the upright frame; 7 is the ground anchor ring; 8 is the core shaft; 9 is the locking rod. The structural diagram of the supporting device for precise wire measurement device is shown in Figure 3. In Figure 3, 10 is an adjustable column; 11 is taken down from the shelves; 12 is locked; 13 is listed; 14 is the wire; 15 is the supporting wheel; 16 is the bearing; 17 is the stabilizer bar; 18 is the protective plate; 19 is the hinge; 20 is the foot board. The main body 6 adopts an “eight shaped” structure, which is conducive to structural stability. Setting the 7 anchor rings on the 1 sliding frame can stabilize the tension on the central axis and prevent the frame from overturning..

Plate Bolt Anchor

Figure 3 Schematic diagram of the structure of the support device for precise wire measurement device.

Set in the main device if.