23 Dec 2019

12mm Treadway Bridge from Butlers Printed Models

Treadway Bridge. Available in 6mm (1/285), 12mm (1/144), 15mm (1/100), 20mm (1/76) and 28mm (1/56).

A treadway bridge was a multi-section, prefabricated floating steel bridge supported by pontoons carrying two metal tracks (or "tread ways") forming a roadway. Depending on its weight class, the treadway bridge was supported either by heavy inflatable pneumatic pontoons or by aluminium alloy half-pontoons. The aluminium half-pontoons were 29 feet 7 inches long overall, 6 feet 11 inches  wide at the gunwales, and 3 feet 4 inches deep except at the bow where the gunwale was raised. The gunwales were 6 feet 8 inches  centre-to-centre. At 6 inches free board, the half-pontoon has a displacement of 26,500 pounds. The sides and bow of the half-pontoon sloped inward, permitting two or more to be nested for transporting or storing.

A treadway bridge could be built of floating spans or fixed spans. An M2 treadway bridge was designed to carry artillery, heavy duty trucks, and medium tanks up to 40 short tons (36 t). This could be of any length, and was what was used over major river obstacles such as the Rhine and Moselle. Doctrine stated that it would take 5 1/2 hours to place a 362-foot section of M2 treadway during daylight and 7 1/2 hours at night. Pergrin says that in practise 50 ft/hour of treadway construction was expected, which is a little slower than the speed specified by doctrine.

By 1943, combat engineers faced the need for bridges to bear weights of 35 tons or more. To increase weight bearing capacity, they used bigger floats to add buoyancy. This overcame the capacity limitation, but the larger floats were both more difficult to transport to the crossing site and requiring more and larger trucks in the divisional and corps trains.

There are four options to choose from:

Pack 1 - Bridge
2x Floats
8x Treadway sections
2x Hook end wedge sections
2x Blunt end wedge sections

Pack 2 - Treadway
8x Treadway sections
2x Hook end wedge sections
2x Blunt end wedge sections

Pack 3 - Extension
1x Float
2x Treadway sections

One bridge erection truck

Treadway Bridge

Treadway Bridge picture 1

Treadway Bridge picture 2

Treadway Bridge picture 3

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Treadway Bridge picture 6

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Treadway Bridge picture 9

Treadway Bridge picture 10

Note: At this scale the wedges are printed attached to a section of treadway

Pictures shown are for 15mm models

All models supplied unpainted, unbased and without crew (figures)

3D printed to order

Butlers Printed Models

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