Source: Luban Supervisor
. Common problems: Basic water accumulation
Hazards: causes rust at the bottom of the standard joint and is easy to break.
Preventive measures: Set up a water pit and use sewage pump to extract the water.
. Common problems: Flaws in the frame (such as open welding, cracks, deformation, distortion, etc.)
Hazards: seriously affects the stress performance of the frame or the top arm, and is prone to fracture, breakage and other accidents.
Prevention: Before entering the site, you must carefully check whether there are defects in each part of the standard section, the main arm, the balance arm, etc. If you want to spray paint, you must check it before spraying.
. Common problem: the verticality is more than poor
Hazard: causes the tower crane to overturn.
Prevention: When burying the foundation base of the tower crane, you must carefully level it, especially after the concrete is poured, you must check and level it. During use, after anchoring and hoisting, the verticality should be checked in time. Discover the problem and find out the cause in time to return it to its position.
. Common problem: the bolt is loose and not tightened
Hazards: causes the frame to be loose, the stress is uneven, and it is easy to collapse.
Prevention: After the tower crane is installed, the bolts of each link must be re-tightened and strengthened. During use, the interval should not exceed one week at most. The new tower crane must be tightened once every two months before use.
. Common problems: Overweight hang objects
Hazards: can easily cause tower crane overturn, main arm breakage, wire rope breakage
Prevention: It is necessary to set the lifting limit and lifting torque limit to ensure sensitivity, and it is strictly forbidden to adjust the high-rise privately; strengthen education for signal command and carefully implement the ten-no lifting limit.
. Common problems: the material is not tied firmly, use shallow hopper, use rebar to weld the hanging ring, and use round steel instead of wire rope to make sling .
Hazards: Hanging objects are prone to loosening, causing objects to fall and cause objects to hit.
Prevention: Education for signal command and lifting personnel, and the binding cannot be lifted; hoppers, etc. must be inspected and inspected, and lifted at four lifting points, and not two lifting points.
. Common problems: drivers are not proficient in signal command business
Hazards: Drivers are not proficient in lifting, lifting speed and walking speed are too fast, unfamiliar with limits, etc., leading to hidden dangers not being discovered; unproficient in signal command leads to overweight lifting objects, unbound, and wrong commands.
Prevention: Strengthen education. Unskilled people cannot operate independently. They must have guidance from masters until they are proficient.
. Common problems: wire rope wear, lint, broken strand
Hazard: Wire rope breaking causes object to hit
Prevention: Timely check, eliminate hidden dangers in a timely manner, and replace
9. Common problems: Cars walk on tightropes to grind frames
Hazards: causes wear of frames and wire ropes. Especially when the wire rope is broken, the car will rush to the end and cause an accident.
Prevention: Careful acceptance, debugging, and strengthen inspection.
0. Common problems: old lifting limit failure
Hazard: limit failure, causing tower crane operation to be out of control, and accidents occur frequently
Prevention: After the installation is completed, a comprehensive inspection must be carried out. The old limit must be replaced to ensure its sensitivity and effectiveness. Check frequently during operation. If there is any problem, replace
1. Common problems: lightning protection measures are not in place
Hazards: 3 Harm: It is easy to cause lightning strikes in thunderstorms Prevention: Timely lightning protection grounding, grounding resistance shall not be greater than 4 ohms.
2. Common problems: Use steel bars or welding rod instead of opening pins or opening pins without opening
Hazards: can easily cause breakage or drag the opening pin out of
Prevention: Check carefully during installation to eliminate this phenomenon. Check frequently during operation and deal with problems in time.
3. Common problems: hook missing or failing insurance
Hazards: can easily cause the wire rope to fall, and cause object strikes.
Prevention: Strengthen inspection and repair in a timely manner.
4. Common problems: On the basis of the cable laying is chaotic, there is a major potential for electricity use;
Hazard: Cable is prone to aging and is susceptible to mechanical damage
Prevention: switch box is placed 3 meters away from the tower body Within, and install rain cover , the exposed cable must be protected with casing or protective plate; the excess main cable of the tower crane is strictly prohibited from being placed on the foundation surface or mopping the floor. You can set up a platform on the standard section and place it neatly on it
5. Common problems: The cable cable is not suspended in standard
Hazard: Cable is subject to a large tension, which harms the cable structure and reduces its insulation performance. If the cable is damaged, it is easy to cause electric shock accidents.
Prevention: is fixed with a porcelain bottle, fixed with a nylon tie tie, and the distance between the fixing points is controlled at 12-15 meters. It is appropriate to
6. Common problems: main chord deformation, horizontal attachment deformation, oblique support deformation, etc.
Hazard: causes the stress structure of the upper arm to change, which is prone to problems.
Prevention: Monitor in advance, first, ask the tower crane rental unit to provide qualified products in advance, and second, the tower crane parts are inspected and accepted immediately as soon as they enter the construction site. If there are any unqualified components of quality, they are notified to the rental unit in time to replace them.
7. Common problems: The anchor position is incorrect, the anchoring random rod welding and lengthening
Hazards: can easily cause changes in the stress structure of the frame, anchor rod lengthening can easily cause defects
Prevention: anchor frame should be close to the main node of the standard section, the anchor rod should not be used long, the concrete strength at the anchor structure should meet the requirements, and all parts should be connected firmly. Strengthen on-site inspections and on-site acceptance.
8. Common problems: cracks and other hidden dangers in welding areas such as standard sections
Hazards: will cause tower crane to overturn
Prevention: Before entering the site to install, especially before spraying paint, be sure to check carefully to eliminate hidden dangers. Drivers should carefully check when going up and down the tower crane every day.
9. Common problem: The passageways from the upper and lower tower cranes from the floor are unqualified. Some people only use a few wooden boards to build
Hazards: can easily cause people to fall.
Prevention: is erected according to regular channels, fixed firmly, with protective railings on both sides, and a secure net is hung.
