Crane operation safety and technical standards

Crane operation safety and technical standards
Proverb, To do a good job must first sharpen his device, operators do a good job for the safe operation of tower  hoist and trolley   for speeding up the construction progress, shorten the construction period, as well as reduce the project cost, has an important role.

    First, the operating conditions
    1 roadbed and track laying crane must be used in strict accordance with the original provisions and comply with the following requirements:
    (1) gauge deviation shall not exceed the nominal value of 1/1000.
    (2) in vertical and horizontal direction, the tilt of the top surface of the rail is not greater than 1/1000.
    (3) two rail joints must be staggered. Rail joint gap between the 3 ~ 6mm, joints should be mounted on sleepers, ends height of not more than 2mm.
    (4) at 1 meter away from the rail terminal must be set limit position stopper, the height shall be not less than walking round radius.
    (5) should be excavated embankment next to the drains.
    (6) the  hoist and trolley  during the construction period, weekly or rain checks for track foundation response and found non-compliance, should be timely adjusted.
    2 the installation of the crane, lifting and removal must be in accordance with the original provisions, and to develop safe work measures by a professional team (group) in the team (group) is responsible under the unified guidance, and for technical and security personnel present custody .
    3 crane installation, in case of no load, the tower and the ground vertical deviation value of not more than 3/1000.
    4 cranes special temporary power distribution boxes, should be set near the middle of the track, the power switch should be in line with requirements. Cable reel must be flexible operation, safe and reliable, not streamers.
    5 must be installed on the  hoist and trolley  walking, luffing, hook height limiter and torque limiter and other safety devices, and to ensure sensitive and reliable. To have the lift cab lifting, broken rope protection device must be reliable.
    6 tower crane body, not hanging placard.
    Second, pre-operational checks and startup
    1 Check the track should be straight, no settlement, no loose track bolts and remove obstacles on the track, release the rail clamp to fasten on.
    2 focus on examination before the job:
    (1) the appearance of institutional structures, the various transmission mechanism should be normal.
    (2) the gear box, hydraulic tank oil level should meet the standards.
    (3) the main part should be no loose bolts.
    (4)  wire rope  wear and wear around the pulleys should be specified.
    (5) supply cable should be no damage.
    3 Check that supply voltage reaches 380V, its range of variation shall not exceed ± 20V, power transmission before the start switch should be zero. Power on, check the metal structure part no leakage before the machine.
    4 no-load operation, check the walking, turning, lifting, luffing and other agencies brakes, safety limit, protective devices, etc. confirm normal only after the operation.
    Third, job safety precautions
    1. Manipulation should be followed step by step operation of the controller, the more files is strictly prohibited operation. Running direction of the transformation, the controller should go to zero, wait until the motor stops rotating, then turned to the other. Smooth operation sought. Non-urgent opening stop.
    2 hook lifting arm near the top of a small crane walking close to reaching the endpoint or the end of the track, you should slow down amble to the stop position. Hook at the top of the arm not less than 1 m, the crane from the track ends not less than 2 meters.
    3 boom cranes lifting, turning, walking three kinds of actions can be performed simultaneously, but only individually luffing. Change Change position after each response check. Allow at full load amplitude loads or near full load, shall not Change.
    4 heavy lifting, the non-free fall. Weights in place, the available micro institution or to make use of brakes slow decline.
    5 elevated heavy pan, the obstacle should be higher than its 0.5 meter span.
    6 Two cranes on the same track or on a similar operation on the track should be maintained between the two machines anywhere near the area (including lifting heavy objects) distance of not less than 5 meters.
    7 main  lift hoist  is not installed on the balance arm rotary crane operation shall not continuous rotation in one direction.
    8 is equipped with a mechanical torque limiter crane, luffing after each, must be based on the radius of gyration and the radius of the permissible load, the load limiting device for ultra-tonnage indicator disc adjustment.
    9 curved track roadbed must meet the requirements, is strictly prohibited in the corners on the job or hanging heavy lifting turn.
    Fourth, job safety precautions
    1 job, the  hoist equipment  hould be parked in the middle of the track position, the arm should go downwind and relaxed swing brake. Car and heavy flat hood location should be moved to non-working state.
    Hook arm raised to the top from 2 to 3 meters.
    2 each of the control switch to the zero position, turn off the brightest switch, turn off the operating room doors and windows, shut off the plane after the power switch. Open the altitude indicator.
    3 locking rail clamp, so that the crane and rail fixed, in case of strong gale, they shall also pull the wind cable wire with ground anchors or building fixed.
    4 Any person cap on the tower, crane, aerial parts of the balance arm of inspection or repair, you must wear a seat belt.