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Hoistable ramps
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Catalog excerpts

Hoistable ramps - 1

TECHNICAL INFORMATION Planning the hoistable ramp Our aim is to design a hoistable ramp which is efficient, economic and safe, while fully meeting the specific operating requirements. The more information that can be given on these prerequisites, the greater the chance to find the optimum solution. Under the following headings information requirements can found before commencing the project. If these answers are available at the earliest stage possible, work will be saved during the later stages, gaining valuable time by shortening the lead time between initial contact and delivery. Ramp length In order to establish the length of the ramp, we need to know the height measurement between the two deck levels, maximum knuckle angle (point of interchange between straight lines), and whether you require a specific gradient of the ramp. If the maximum knuckle angle is not known and/or gradient, please indicate the total vehicle height, height and ground clearances, wheelbase and overhang at front and rear. Where there is a need for higher vehicle speeds during loading and unloading a shallower ramp gradient is often called for. The length of the ramp will then be longer Clear height, gradient and height between decks Photo: denniz@corsman.se Hoistable ramps than that calculated only on the basis of geometrical clearance at the knuckles. To minimize the ramp length, we often construct the ramp with an s-shaped profile, with a shallower gradient at each end of the ramp. Ramp width Describe the internal cargo flow onto and off the ramp. Indicate the required number and width of lanes on the ramp. Typical clear width values: 3,5 m for single-lane and 6,0 m for dual-lane trailer traffic and 3,0 m for single-car lane and 5,0 m for dual-car lane. Clearance and type of vehicles Loadings In order to dimension the steel structure with the required strength and minimum weight we need to know the following: What kind of vehicles will be driven over the ramp? What are the axle loading and wheel print area? How many axles are there and how far apart are they? How much total simultaneous loading must the ramp withstand, i.e. what is the maximum number of vehicles likely to be found on the ramp at the same time during loading and unloading? What is the maximum total weight to be supported on the ramp when it is being raised? Interface between ramp and ship When you design the hull in the area of the ramp, adequate space must be reserved for the ramp and its associated equipment. The ramp requires a longi udinal t space approximately (as a rule of the thumb) eight times the height between the decks. The lateral space consists of the clear driveway plus up to 500 mm at each side of the ramp depending on size. This space is needed for railings, sealing system and operating equipment. Contact us early in the planning stages if you require a more precise estimate of the space.

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Hoistable ramps - 2

Reserve space for ancillary ramp equipment Hydraulic capacity The determining factors in the dimen sionng of the capacity of the hydraulic i system are the size of the ramp, total load when raising, and the required speed of opening and closing. A typical time for opening or closing is 2 to 5 minutes, excluding opening and closing of the securing devices. The shorter the time, the more costly the required hydraulics. Clearly, there is also a limit to the technical feasibility. An indication should be given of the maximum and minimum ambient temperatures in which the hydraulic system is to...

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Hoistable ramps - 3

The main section of the ramp There are two types of steel structure. For short ramps and low loads you should choose a steel structure with girders below the top plate and separate railings. For long ramps and high loads, choose a steel structure with high side girders which also serve as railings. Handrail options Handrails are available in three versions which can all be combined on the same ramp. • Automatically foldable handrails Portable and stowed on board during the voyage. Steel structure with girders below the top plate Steel structure with high side girders Automatically foldable...

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Hoistable ramps - 4

Flap options Select one of the two flap designs. One is stowed horizontal in the raised position. The other is stowed upright, forming a barrier at right angles to the ramp with a free end. Cleat mechanism Non-foldable flap Quality of fittings Shafts and pins exposed to the weather are of stainless steel. Cylinders are fitted with spherical plain bearings. Foldable flap The MacGregor standard for hoistable ramps Over the years MacGregor has designed and manufactured a great variety of hoistable ramps for different types of ships. We therefore promise that your ramp will meet your needs in...

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