Brunel Swivel BridgeBrunel's Other Bridge

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Brunel Swivel Bridge Project Plans

During our investigation, we have looked at original plans, plans of modifications and created plans to describe what we have found, to fortell what we may find and will all aid what will need to be done. This will help with funding applications, increase public understanding, and get help.

Original drawings

Brunel Swivel Bridge
Brunel Swivel Bridge Drawing 1849
cross section
Tear drop cross section
cross section
Pintle section modified in 1902
Brunel Swivel Bridge
Geoff Wallis's plan of the pintle

Bob Watkins, one of our volunteers has been producing amazing CAD drawings of all the parts of the Bridge and predicted that there would be large timber beams just under the ground, supporting the turn-table wheels. Mike B, Josh and Bob dug down to see if they existed, and sure enough discovered a 12 inch square baulk to everyone's delight.

Bob in action

Brunel Swivel Bridge
Martyn neasuring and Bob taking notes
Brunel Swivel Bridge
Bob with graduate engineers

Bob's Drawings Plan guide

There will be a bit of overlap ie showing how the superstructure fits into the abutments, etc, etc but this is the general idea. There will be a page for each drawing series.
Brunel Swivel Bridge
Brunel Swivel Bridge
  • Survey Structure as found: Updated 13 Feb 2015
    000 series Elevations 01-03 and Level Survey 050-056
  • Foundations as expectedUpdated Aug 2014
    101 series (including adjacent structures where known) turntable 101-105
  • Abutments Updated 13 Feb 2015
    200 series (including rail track on south side and latching mechanism on north side 201-204)
  • turntables Updated 26 March 2017
    300 series
    We believe the track of the turntable is made of two wrought iron bridge rails bolted flange-to-flange with lead sheet between them. The underside of the lower rail forms the track on which the four wheels run, but its surface is badly pitted so we shall have to dismantle it, check its condition/thickness, and decide then what to do to improve the surface. If there is sufficient thickness in the top part of the rail we could machine off the undulations, assuming that there is sufficient strength in the rest of the corroded rail section. If not we shall probably have to renew the rail with a modern section of steel. We may need to do this anyway if we need to create a track for a haulage cable to run on.
    intended dimensions of the rail track. Achieving agreement between our dimensions and the original drawing dimension to within 60 thousandths of an inch was amazing. We will obtain a price for profile-cut 16mm plates
    301-309 including turntable base, pintle
    310-314 series (central wheels) is the drawing for the rotor wheels with the addition of 314 which shows the bronze shells that we took out
    351-353 is the proposed new wheel assembly for the substandard NW wheel. 24 April 2017
  • turning mechanism elevations Updated 9 Feb 2015
    400 series (including control mechanism and various pits) 401-405, Hydraulic Cylinder and ram 406-407
  • Superstructure Updated 23 Feb 2015
    500 series (including counterweights 501-503 and rear wheels, tie bars 504-505, beams 506-510, ‘jib’ end of the bridge 518 and 519 – the latch and roller, 520-523 transverse beams, 524 turntable beam) Updated 2 March 2017
  • Transverse and Turntable Beams Inspection and measurement of the Superstructure transverse beams showing visible defects, showing rivets, bolts, plates and corrosion
  • South Edge Beam Inspection and measurement of the edge beams showing visible defects, showing rivets, bolts, plates and corrosion
  • North Edge Beam Inspection and measurement of the edge beams showing visible defects, showing rivets, bolts, plates and corrosion
  • Ground investigation

Plans to come

Look at the reports page to see the summaries of the results of inspections of the bridge. Updated 11 January 2016

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