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Or settlement of any part or imperfection of the centres or by any other causes the Contractor shall amend or remove such irregularity in a satisfactory manner.
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For the effectual drainage of the upper surface of all arches the spandrils shall be formed with sufficient fall to allow the free escape of the surface water towards the outside wall and into glazed or cast iron drain pipes as shewn on the drawings and the whole must be made perfectly watertight.
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| ||style="text-align:center;" | '''[[Bewdley Tunnel|Tunnel]]'''<br>'''Drawing Nº7'''
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| || The Tunnel commences at 1M. 4 Chs. & terminates at 1M. 26 Chs. It is 484 yards in length<ref group="note">The actual length of Bewdley Tunnel is 480 yards</ref>.
Excavation and Mining 07:33, 11 October 2020 (UTC)07:33, 11 October 2020 (UTC)07:33, 11 October 2020 (UTC)07:33, 11 October 2020 (UTC)~ The Works consist in constructing a Tunnel of the size necessary for a single line of Railway and lining the same with Brickwork as shewn on Drawing No. 7.
The contractor will be at liberty to open cut the ground at each end of the tunnel to the extent of not more than twelve yards from the front for the purpose of building the end lengths. The width of the Excavation is on no account to be greater than the outside of the Masonry or Brickwork and the sides shall be well supported and kept open by suitable timbering until the Masonry or Brickwork is completed. The open space is then to be filled up to the original surface by layers of clay not more than One foot in thickness, each of which is to be well and carefully punned<ref group="note">"Punned" is similar to "puddled", clay that has been rammed hard to make it water tight.</ref> before laying on the succeeding layer. When completely filled, the surface to be neatly trimmed to the surface and inclination of the Excavations and to be properly turfed or soiled and sown with seeds.
The Work is then to be continued from the open ends by mining in the usual way. The Excavation obtained from the Tunnel is to be tipped into the Embankment or run to spoil at the ends of the Tunnel and dressed and soiled as directed by the Engineer.
Should any portion of the Tunnel in the opinion of the Engineer not require to be bricked the same shall be excavated as nearly as possible to the net size shewn on the Drawings and no portion of the Tunnel will be permitted to be of less dimensions than shown on the drawings at anpoint any point but no allowance will be made for any Excavations in excess of the drawings. If on the completion of these portions of the Tunnel, the Engineer should on examination be of opinion that any pieces of rock have been so far loosened by the blasting and other mining operations as to be in danger of falling out, the Contractor shall remove such pieces of rock on being required to do so without any additional payment therefor.
The Contractor will be required to support by means of good and sufficient timbering such portions of the tunnel as may require it until the brickwork is executed. Great care must be taken to draw such timber as far as practicable so as not to build it in and the space occupied by the timber must be securely packed or rammed on the removal thereof. No allowance will be made for such timber, whether built in or drawn or for any additional excavating or packing or ramming, consequent thereon, but the Contractor must include all such items in his price for the tunnel
In no case when the tunnel shall require to be so timbered, are the excavations to becarried be carried more than 12 feet in advance of the brickwork, but the lengths to be taken out at one time in advance of the brickwork are to be absolutely at the control of the Engineer
The Contractor shall also, at his own cost and risk provide such pipes, steam jets or other means of ventilation as may be necessary for the proper ventilation of the tunnel so that no hindrance may be occasioned by smoke or foul air
Safety recesses or man holes are to be made in the sides of the tunnel of the form and dimensions shewn on the Drawing.
The whole of the brick lining to be executed in every respect conformably with the Specification, and if, at any time the regular continuity of the brickwork of the tunnel shall be destroyed either in consequence of shrinking
Or settlement of any part or imperfection of the centres or by any other causes the Contractor shall amend or remove such irregularity in a satisfactory manner.
Drains are to be laid through the side walls to permit of free drainage of water, at such intervals as the Engineer may direct, and drains are to be laid down, each side of the tunnel, of the form and dimensions shewn on the Drawing.
Should the Engineer authorise the Contractor to substitute Masonry for Brickwork in any portion of the side wallos walls of the tunnel, such Masonry shall consist of coursed rubble, and shall be executed in all respects in conformity with the Specification.
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