Difference Between Double Girder Overhead Crane and Single Girder Overhead Crane

What is the difference between a double girder bridge crane and a single girder crane? 

Simply put, when the double-beam bridge crane is operating, the lifting torque is transmitted to the lower part of the beam through the transmission mechanism. This is not the case for single-girder cranes, as the lifting moment is transferred to the top of the single-girder.

Which one is better for double girder bridge crane or single girder bridge crane? 

Single-girder cranes have better performance. Generally, double-girder bridge cranes generate electricity through decelerating operation, double decelerating wheels, and driving the working mechanism to turn in both positive and negative directions. At the same time, the g-i speed transmission mechanism is adopted, which can make the transmission average acceleration up to 4m/s. The deceleration time is greatly shortened, the acceleration is small, and the work load that requires a large load is difficult to meet with a single-beam crane, but a double-beam bridge crane can meet it. In addition, the reduction wheel on the top of the single beam can turn the working mechanism forward and backward, and the bracket is installed under the steel beam, which can greatly reduce the force during transportation.

There are also differences in the layout of double-beam bridge cranes and single-beam cranes: single-beam cranes are placed on the outside of the bridge and hoisted from the pier; double-beam bridge cranes are placed on each side of the pier and hoisted from the pier. Therefore, the double-beam bridge crane can continuously lift and the operation is simpler.

What is the difference between a double girder bridge crane and a single girder crane? Is it big?
The Chinese version of the "Civil Engineering Construction Data Compilation Specification" of Urban Construction stipulates: "When a two-beam crane and a single-beam bridge are used at the same time, because the radii of the end points of the two sides of the slab are equal, the average calculation area of the volume is larger. The two-beam crane is better than the single-beam bridge. The cantilever span of the bridge crane is 5% to 6% larger, and the cantilever span on both sides is 12% to 15% larger."
What is the difference between a four-beam bridge crane and a double-beam bridge crane?
The Chinese version of the "Civil Engineering Construction Data Compilation Specification" of Urban Construction stipulates: "When a four-beam bridge crane and a double-beam bridge crane are used at the same time, because the cantilever span of the four-beam bridge crane is smaller than the cantilever span of the single-beam bridge crane, the volume is average The calculation area is larger. The cantilever span of the double-beam bridge crane is smaller than the cantilever span of the four-beam bridge crane, and the volume average calculation area is larger." Then, in this sentence, "two-beam crane" and "single-beam bridge crane" are again what differences are there?
First of all, according to the load factor, the load capacity of the three-beam bridge crane is 10% to 15% higher than that of the double-beam bridge.
Secondly, four-beam bridge cranes and double-beam bridge cranes are equipped with joints, but single-beam bridge cranes have no joints.
Single-beam bridge cranes and double-beam bridge cranes must cooperate with each other during the construction process to ensure that the established design calculations in the future can reasonably solve the problem of "double-beam bridge crane torsion coefficient" under the premise of satisfying full use requirements. It is just equal to the various unfavorable conditions brought about by the strongly related project of "single-girder bridge crane pulling force coefficient". The procedure of moving the vehicle to the full position belongs to the construction unit's own use to carry out technical transformation and adapt to existing engineering problems. However, when the crane and the vehicle cooperate, whether the crane can function economically is a problem considered in the actual construction. This is also the main consideration for many engineers. The assembly position of the vehicle is determined by the construction environment, even if it is caused by a panoramic rollover. The impact of heavy load operation is actually quite large.
Finally, who is responsible for the production cost of the crane? If you want to undertake the work of assembly and debugging, you can use a manufacturer that has two types of cranes. It is not necessary to use three steel rails and two tracks at the same time to cooperate with the construction. If the requirements are higher, it may be more difficult to use a four-beam crane with bridge cranes that have strong cooperation, bridge boom erection, and lower beam steel joints and upper beams.