Delft University of Technology
Faculty Mechanical, Maritime and Materials Engineering
Transport Technology

F.G. Giebel Massareductie op de horizontale transportwagen van de "Carrier Crane".
Literature survey, Report 2003.TL.6820, Transport Engineering and Logistics.

After a short introduction about the subject it is explained why the ship shore container crane "Carrier Crane" has been developed. There is the answer to the question "How to realize mass reduction on the horizontal container carrier", which is important for the structural dimensioning of the "Carrier Crane".

The global market for the transportation of sea freight containers is still growing and this will result in larger and more cost efficient vessels. The conventional ship shore cranes which are being used today are most likely not able to fulfill the requirements needed in the future. This is the reason why the section Transport Technology has developed a new type of ship shore container crane. This "Carrier Crane" is capable to load and to unload a Ultra Large Container Ship with an operational capacity of 65 moves/hour.

Figure 1 Basic design "Carrier Crane".

The working principle of the "Carrier Crane" for the procedure of unloading a container ship is explained in figure 1. One of the two vertical transportation systems, which are in position for picking up a container from the vessel, lifts the container. On the instant that the container is fully risen a horizontal container carrier drives underneath. After detaching, the container is transported to the back of the crane. The containers are temporarily queued up and waiting for descending. At each move of the vertical transportation cycle two containers are places on an Automatic Guided Vehicle.

Because there are a number of sixteen horizontal container carriers traveling in the extremities of the boom and girder a minimum of mass of a horizontal container carrier is desirable. The purpose of this report is to investigate the possibility of mass reduction of the horizontal container carrier. This objective is realized by significant mass savings by the following topics. The realization of these objectives results in eight possible designs. The mass is reduced from the preliminary estimation of 10 ton to approximately 6 ton. Mass reduction is mainly accomplished by two different types of reasons. In my personal opinion the application of a construction build from hollow rectangles 100*100*6,5 with the material Fe 510 and welds of special quality is best likely to fulfill the requirements stated in the report, although this configuration does not differ a lot from the other seven stated solutions. All eight proposed solutions are checked by international standards to ensure enough safety for strength, stiffness and durability. The control calculations for stability are not preformed in this report. That includes calculations for eigenvalue problems. So this is something that also has to be done before taking further action.

As a consequence of these mass reductions on the horizontal container carrier the structure of the "Carrier Crane" can be optimized. Real mass reductions can be expected and this will reduce forces on the corners of the crane, the rail and quay. So it can be concluded that the realization of the "Carrier Crane" is one step further to application in real life.

Reports on Transport Engineering and Logistics (in Dutch)
Modified: 2003.12.24; , TU Delft / 3mE / TT / LT.