Safety measures for construction of the hottest ca

2022-07-24
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Safety measures for cable construction

1 before the construction of directly buried cable laying, the drawings shall be checked first, and then a sufficient number of sample holes and trenches shall be excavated to find out the distribution of underground pipelines. The photons have both quality and speed conditions, so as to determine the laying position of cables and ensure that the running cables and other underground pipelines are not damaged

2 in order to prevent damage to operating cables or other underground pipelines and facilities, large machinery should not be used to excavate trenches within the red line of urban roads. Small machinery and equipment can be used to break the surface of hard pavement, but supervision should be strengthened and it is not allowed to go deep into the soil layer. If large mechanical equipment is to be used, corresponding approval procedures shall be performed. Most of them need heat treatment to strengthen the alloy, eliminate the internal stress of castings, stabilize the structure and part size

3 road excavation construction should have corresponding traffic organization scheme, and then select deformation; Set the holding time as 0 seconds to take safety measures to prevent traffic accidents. The construction area shall be strictly separated by standard barriers and clearly marked. Warning lights shall be hung at night to prevent pedestrians or vehicles from mistaking people

4 when the trench excavation depth reaches 1.5m and above, measures shall be taken to prevent soil collapse

5 during trench excavation, the pavement paving materials and soil shall be stacked separately, and the stacking place and trench shall reserve channels for the construction personnel to walk normally. Tools, materials and other objects shall not be placed on the slope where the stacked objects are stacked, so as to avoid slipping into the trench and damaging the construction personnel or cables

6 after the cable protection board is dug, it shall be guided by experienced personnel on site before proceeding to avoid accidental injury to the cable

7 if the excavated cable or connector box needs to be hollowed out, suspension protection measures shall be taken. Cable suspension shall be per When a 5m long joint box is suspended, it shall be placed horizontally without tension. If there is no protective box for the cable joint, a widened and lengthened wooden board shall be padded under the joint before suspension. When the cable is suspended, iron wire or steel wire shall not be used to avoid damaging the cable sheath or insulation

8 generally, the mobile cable joint shall be powered off. If the live line must be moved, the historical records of the cable shall be investigated first, and the experienced construction personnel shall move smoothly under the unified command of a specially assigned person to prevent damage to the insulation

9 before sawing the cable, it shall be checked to be consistent with the cable route drawing, and after the cable is confirmed to be dead by using special instruments (such as induction method), it can work only after the cable core is nailed with grounded iron with insulating handle. The person holding the insulating handle shall wear insulating gloves and stand on the insulating pad

10 special tools shall be used when opening the cable well cover, cable trench cover and cable tunnel manhole cover, and attention shall be paid to the standing position to avoid injury after slipping off. After opening, standard barriers shall be set up and guarded. After the workers leave the cable well or tunnel, the well cover shall be covered immediately to prevent pedestrians from falling or falling into the well after touching the cover

11 the cable tunnel shall be provided with sufficient lighting and fire prevention, waterproof and ventilation measures. When working in the cable well, it is forbidden to open only one well cover (except single hole well). Before entering the cable well and cable tunnel, use a blower to remove the turbid gas, and then use a gas detector to check whether the content of flammable, explosive and toxic gases in the well or tunnel exceeds the standard, and make records. After the cover plate of the cable trench is opened, it shall be naturally ventilated for a period of time before going down to the well for work. When working in cable shaft and tunnel, the ventilation equipment shall be kept normally open to ensure air circulation

12 during the construction of oil filled cables, the cable oil shall be collected. The cable oil scattered on the ground shall be immediately covered with yellow sand or sandy soil and removed in time to prevent pedestrians and vehicles from slipping

13 a transition connection device should be installed between the 1OkV drop fuse and the lOkV cable head to keep a safe distance from the live part of the pile head on the drop fuse during operation. Under the condition that the pile head on the lOkV drop fuse has power, it is not allowed to install or replace the cable tail wire or hoist or lap the cable terminal under the pile head of the drop fuse before safety measures are taken. If the above work must be carried out, the special insulating cover shall be used for isolation, and the grounding wire shall be installed at the lower pile head. The staff shall stand at a low position, and their hands shall not exceed the pile head under the drop fuse, and a special person shall be assigned to supervise. Insulating tools shall be used for the above work. The above work is prohibited in rainy days

14 when using portable stove or blowtorch, the distance between the flame and the live part shall not be less than 1.5m if the voltage is lOkV or below; The voltage is at lokv The above shall not be less than 3m. It is not allowed to refuel and ignite the furnace or blowtorch near the live conductor, live equipment, transformer, oil circuit breaker (switch) and in the cable interlayer, tunnel and trench

15 in the process of making epoxy resin cable head and mixing epoxy resin, effective anti-virus and fire prevention measures shall be taken

16 after the completion of cable construction, the holes crossed shall be blocked to meet the requirements of waterproof or fireproof

17 safety measures for Trenchless Construction:

1) before using Trenchless Technology for construction, the relative positions of various underground pipelines and high-temperature gas expansion facilities should be explored first

2) the non excavated passage shall be kept away from various underground pipelines and facilities at a sufficient safe distance

3) when the channel is formed, the construction area shall be grouted in time to prevent subgrade settlement

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