SPMT stands for 'self-propelled modular trailers', equipment that is used in a wide range of industries. SPMT's can easily transport civil constructions and petrochemical components on land.
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During load-outs, they are often used as vehicle to drive heavy load components from the quay onto the barge. One trailer consists of different modules from 4 or 6 axle lines with a capacity of 36 up to 48 tons per axle line each. SPMT's have the possibility of circle drive around the centre of the trailer or execute "crab moves".
The lifting height of heavy load components is approx. 500 mm.
Due to their variety of combinations, they can lift and move nearly every heavy load component.
A self-propelled modular transporter or sometimes self-propelled modular trailer (SPMT) is a platform vehicle with a large array of wheels. SPMTs are used for transporting massive objects such as large bridge sections, oil refining equipment, motors and other objects that are too big or heavy for trucks. Trucks can however provide traction and braking for the SPMTs on inclines and descents.
SPMTs are used in many industry sectors worldwide such as the construction and oil industries, in the shipyard and offshore industry, for road transportation, on plant construction sites and even for moving oil platforms.
A typical SPMT can have a grid of several dozen computer-controlled wheels, all individually controllable, in order to evenly distribute weight and steer accurately. Each individual wheel can swivel independently from the others to allow it to turn, move sideways or even spin in place. Some SPMTs allow the wheels to telescope independently of each other so that the load can be kept flat and evenly distributed while moving over uneven terrain. As SPMTs often carry the world's heaviest loads on wheeled vehicles, they are very slow, often moving at under one mile per hour while fully loaded.
Some SPMTs are controlled by a worker with a hand-held control panel, while others have a driver cabin. In addition, multiple SPMTs can be combined to transport massive building-sized objects.
SPMT Characteristics
1.Stability
Each trailer unit can be separated into 3 and 4 hydraulic fields. Each field can maintain hydraulic pressure to each axle in that field. This allows the trailer to adjust for uneven surfaces increasing stability of the loads.Low loading height & Wide wheel track ensures extreme stability.
2.Loading Capacity
Platforms are torsion-free and bending resistant, designed for direct loading. Platform design and hydraulics allow for a maximum 40,000 kg per axle line.The platform trailer can be equipped with serrated aluminiumplates to cover the track rods.
3.Power
Power Pack Units (PPU) provides power to the hydraulic systems controlling axle height, steering, braking as well as powering the electrical systems. Each Diesel engine (Z320) is rated at 350 kw.A Power Pack Unit (PPU) supplies the hydrostatically driven SPMT with pressure oil for the drive, steering and lift operations.
4.Transprt
Components dimensions and weights are container-capable for cost-effective transport throughout the world. However mobilization and demobilization cost of axles at their desired workplace is itself a concern.
5.Configuration
All trailers are completely modular, meaning they can be coupled together end to end or side by side to create many transport configurations.
6.Axle Type
Self-propelled modular trailers come in two types: 4 axle and 6 axle. Axles consist of 3 types: propelled, braked and free-wheeling.
Propelled Axle type SPMT: In this system, Axles of SPMT gets power by power pack unit and start functioning.
Braked Axle type SPMT:In this system, axles always remains in braked position, at the time of movement, they get un-braked and then got powered by power pack unit.
Free Wheeling: In this system, All axle remains in free position. Braking and Acceleration separately controlled by Power pack unit.
7.Axle Control
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Each axle is controlled independently by the computer steering system allowing the trailers to move in several pre-programmed steering modes, or manual control modes. With this system trailers can be combined mechanically or separated, still acting as one unit. This allows for any conceivable steering movement. Trailer can also be raised or lowered up to300mm. These functions are operated by a remote control unit.
Following points needs to be considered while selecting any Axle combination for SPMT:
1. Each Axle lines has 8 Tires & One axle line is 3 m wide.
2.Net Average Payload approx 25-30 T per axle line =3.125-3.75 ton / tire.
3. Average own weight of single axle line approx 3-5 ton depending on Manufacturer's model.
4. Well known manufacturers are Goldhofer, Scheuerle, Cometto and Nicolas.
5. The trailers can be bought in modular units of 3,4,5,6 and 8lines of 3-3.5 m wide.
6. The axle line distance varies from approx 1.40 m to 1.80 m depending on the application and manufacturer.
7. In India, Permissible load limit per axle line ( 8 Wheels) is 13.5 MT on Highways.
Axle Sets are available in two module :
4 Axles Set & 6 Axles Set. On the base of equipment dimension, these axle sets can be configured as per requirement.
Dimension of 4-axle set (Approximate) :
Length: 5.6 m , Width:2.43 m , Height: 1.5 +/- .3 m
Dimension of 6-axle set (Approximate) :
Length: 8.4 m , Width:2.43 m , Height: 1.5 +/- .3 m
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