Overhead gantry crane is a variant of the bridge crane, also known as gantry crane. Mainly used for outdoor freight yard, expected field goods, bulk cargo handling operations. Its metal structure resembles a door-shaped frame, with two legs mounted under the main girder, which can be directly tracked on the ground. The two ends of the main girder can have outrigger cantilevers. Gantry crane has the advantages of high site utilization rate, wide operating range, wide adaptability, and versatility. It is widely used in the port yard.
Gantry crane classification
Divided into gantry crane and cantilever gantry crane classified by crane structure
Gantry Crane
- Gantry Crane: the main girder has no overhang, the crane trolley is in the main span;
- Semi-gantry crane: legs have a height difference, can be customized according to the civil construction site requirements.
Cantilever gantry crane
- Double cantilever gantry crane: the most common form of structure, the structure of the force and the effective use of space are reasonable.
- Single Cantilever Gantry Crane: This structure is often selected due to site constraints.
- Corrosion protection of gantry cranes is a very important task because it is very dangerous to be anticorrosive because it is very dangerous to work in the air since it is not done in advance. Now we introduce the gantry anti-corrosion quality assurance measures and construction safety measures.
Gantry crane anti-corrosion quality assurance measures
Adhesion check, with a tape sticky mouth area, and then along the vertical tear tape quickly, the coating should be free from flaking, and the inspection should choose non-important parts, immediately after the test coating;
- Gantry crane corrosion should ensure that the construction team before the start of a detailed technical explanation;
- Gantry crane corrosion surface treatment qualified, after the supervision of the painting;
- Fully implement the national standards and the Three Gorges Project quality standards. Conscientiously implement the higher level of quality management systems and regulations;
- Gantry crane anti-corrosion coating process, if found leakage, sagging, wrinkles and other defects, must be promptly addressed. After the coating is completed, the appearance of the coating should be uniform, no sagging, wrinkling, bubbling, pinholes, cracks and other defects;
- Strict implementation of the internal “three-seizure,” strict self-test, the procedure was not tested, shall not be carried out under the procedure;
- Strengthen the supervision of on-site construction quality and strengthen the control over the construction process;
- The implementation of quality responsibility system, the process of implementing layers of quality responsibility;
- Strict process style, serious process discipline;
- Timely and accurately fill in the test records, the construction problems found in a timely manner to the higher authorities, to resolve the program approval before implementation.
Anti-corrosion safety measures for gantry crane
Gantry crane anti-corrosion construction Lifting ladder and hanging basket should be carefully checked before use and the quality of the weld, qualified to use. At the same time also in the course of the ladder and hanging basket should also be carried out from time to time check;
- Gantry crane anti-corrosion construction platform should meet the national safety standards, acceptance by the safety supervision after the start of work;
- Gantry crane anti-corrosion high-altitude workers must fasten double insurance, wear seat belts, caps, and labor protection according to relevant requirements;
- Gantry crane before the anti-corrosion construction, all construction workers should pay security technology, in strict accordance with the construction of technical programs, shall not be allowed to change the technical program, if necessary, change the program must be submitted to the higher technical department, approved before implementation;
- Crane operations to be directed, hand monitoring; command signal to be uniform, clear and clear;
- Painting site no smoking, no fire, and equipped with the corresponding fire equipment;
- Steel pipe installation team in the removal of welding legs and other welding scars, we must pay attention to fire prevention, to prevent damage to cables or electrical equipment, if necessary, carbon arc gas planing welding scar and equipped with fire extinguishers on-site guardianship;
- Correct choice of spreader, cannot be a small generation, sub-filled new;
- Coating construction electricity should meet the relevant provisions;
- Hanging basket is strictly forbidden to overload, each time the operating personnel should not exceed 2 persons, the construction workers on the hanging basket are forbidden to extend the body out of the hanging basket;
- No more than 4 workers shall be on the same hanger, no more than 2 workers shall be employed in the same workplace;
- Door machine (gantry crane) anti-corrosion construction process should be assigned to special care workers dedicated construction tooling and throwing debris is strictly prohibited;
- Resolutely obey the management of on-site security staff, the operator on the hanging basket must be double insurance rope, hanger should be laid safety net and set up railings;
- In strict accordance with the Headquarters command of the safe operation of the implementation of regulations;
- Hazard identification, risk assessment and control planning (Fj431-1;
- Flammable waste during the construction of anti-corrosion coating of gantry crane should be properly stored and burnt regularly.
