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House-section trailers built like bridges
Page 55
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• A number of special semi-trailers are being built by Reynolds Boughton of Amersham for the transport of pre-fabricated house sections. They will be employed in the T. T. Boughton transport fleet working on behalf of Taylor Woodrow, the civil engineering group.
The trailers have been designed on the bridge structure principle using the frames which support the fabrications in transit as the spreaders between the upper and lower stress members. In this way a total beam depth of 9ft 6in. has been achieved with, at the same time, an unladen weight of 6 tons.
The main structure comprises pressedand fabricated-steel formers which are disposed at 3ft 7in. intervals along the trailer's length. These are of 10 s.w.g. mild steel and are tied together by RSJ section members at the bottom and by 4in. drawn steel box-section members in the shape of an arch over the tops of the transverse frames.
This design is capable of accepting an evenly distributed load of 20 tons, while still offering a flat base, which will not sag under load, for the building sections to sit upon.
Sections of up to 25ft in length can be carried, those loaded on the sides of the frame being tilted inwards and those loaded in the centre of the frame standing vertical.
A diagonally braced stiffening frame is secured to the two-main frames by heavy fly-nuts. This section is removable to allow full-length fabrications to be carried in the centre division of the trailer.
Rubery Owen M Series running gear, with 22,50011) axles, is used. Brakes 16.5in. by 7in. powered by dual diaphragm wheel chambers through a three-line pressure system, are standard equipment. All the trailers built are having Davies heavy duty landing gear fitted with swivelling elephant feet. Michelin 020 X tyres are fitted to all the units.
The trailers are 38ft 6in. long, and because when connected to a two-axle tractive unit the outer axle spread exceeds 38ft, the four-axle outfit is plated to operate at 32 tons gross.
Although the present batch is for service in the Boughton fleet, the trailers are to be produced for sale to other companies at £2,675 list, subject to normal discounts.