The gantry crane can be classified according to the main beam structure, according to the main beam structure, according to the form of use.
It is divided into gantry crane and cantilever gantry crane
1. all gantry crane: the main beam without overhang, the car in the main span;
2. semi gantry crane: leg height difference, according to the use of the site of the civil engineering requirements.
Cantilever gantry crane
1. double cantilever gantry crane: the most common form of structure, the force of its structure and the effective use of the site area are reasonable.
2. single cantilever gantry crane: this structure is often chosen because of site restrictions.
Main girder form
1. single girder
Single girder gantry crane has the advantages of simple structure, convenient manufacture and installation, its quality is small, the partial rail box frame structure. Compared with the double girder gantry crane, the overall stiffness is weaker. Therefore, when the lifting weight is Q&le, 50t, span S&le, 35m, this form can be used. L type and C type two forms of single girder gantry crane legs. The L type is easy to manufacture and install, the force is good and its quality is small, but the space of the cargo is smaller through the leg. The leg of C type is made of inclined or curved shape, the purpose is to have larger transverse space, so that the goods can pass the supporting foot smoothly.
2. double girder
Double girder gantry crane span, strong bearing capacity, good overall stability, but its quality and varieties, the same as single girder gantry crane weight compared to the more high cost. According to the main girder structure, it can be divided into two forms: box girder and truss. Generally, box structure is adopted.
1. truss beam
The structural form welded by angle iron or I-beam has the advantages of low cost, light weight and good wind resistance. However, due to many welding points and defects of truss itself, truss beam also has many shortcomings, such as large deflection, small stiffness, low reliability, and need to detect solder joints frequently. It is suitable for the site with low safety requirement and small lifting weight.
2. box girder
The use of welded steel box type structure, has the advantages of high safety, rigidity etc.. Gantry cranes generally used for large tonnage and large tonnage. As shown on the right MGhz1200, the crane weighs 1200 tons and is the largest gantry crane in China. The main girder adopts the box girder structure. Box girder also has the disadvantages of high cost, self important, poor wind resistance and so on.
3. castellated beams
Generally refers to “ isosceles triangle castellated beam ” the main beam end is triangle, there is a honeycomb hole on the inclined belly of both sides, and there is chord on the upper and lower part. Honeycomb beam absorbs the characteristics of truss beam and box girder, and has larger rigidity, smaller deflection and higher reliability than truss beam. But because of the use of steel plate welding, the weight and cost ratio of truss beam Shaogao. It is suitable for site or beam field with frequent or heavy lifting capacity. Because the beam type is patented product, so the manufacturer is less.
Form of application
1. ordinary Longmen crane
Track gantry crane, track gantry crane
This kind of crane uses box type and truss type structure most, and has the most extensive use. Can handle a variety of pieces and scattered materials, lifting the weight of less than 100 tons, span 4~39 meters. The ordinary gantry crane with grab is of higher working level. The ordinary gantry crane mainly refers to the hook, grab, electromagnetic, hoist gantry crane, but also includes the semi gantry crane.
Longmen crane for 2. Hydropower Station
It is mainly used for lifting, lifting and closing gates, and also for installation work. Lifting capacity of 80~500 tons, span is small, 8~16 meters; lifting speed is low, 1~5 meters / minute. Although this crane is not often hoisted, but once the use of work is very heavy, so it is necessary to appropriately improve the level of work.
3. shipbuilding Longmen crane
Ship to berth assembly, standing two lifting trolley: one of two main hook, running in the bridge on the flange of the rail; the other has a main hook and a hook on the bridge side, under the flange orbit, to turn and lifting large hull. The lifting capacity is generally 100~1500 tons; the span is 185 meters; the lifting speed is 2~15 meters / minute; and there is also 0.1 to 0.5 meters / minute fretting speed.
4. container Longmen crane
Container terminal. Trailer bridge to quay container carrying containers unloaded from the ship
Rail mounted gantry crane rail gantry crane
To the yard or rear, away from the Longmen container crane stacking up or direct loading, can speed up the bridge or other crane container carrying the turnover. The stacking yard of containers with 3~4 layers and 6 rows can be piled up, usually in the form of a tyre, and also in a rail type. Container crane in Longmen compared with the container across the vehicle, its span and the height of both sides of the door frame is larger. In order to meet the transport needs of the port, the crane has a higher level of work. The lifting speed is 8 ~ 10 m / min; span across the container according to the number of rows, maximum of 60 meters corresponding to 20 feet, 30 feet, 40 feet long container from the weight of about 20 tons, 25 tons and 30 tons.