CO129-545-9 Proposed reorganisation of medical and sanitary services 2-11-1933 - 10-1-1934 — Page 183

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Note. The approval of plans by the Building Authority under these regulations certifies simply to the fact that the plans are in accordance with the Buildings Ordinance, 1932, and with the regulations made thereunder, but signifies no approval of the sufficiency or otherwise of the plan and throws no responsibility on the Building Authority.

4. Any person carrying out excavations for drainage works on any premises contiguous to a public thoroughfare, whereby the safety of the public may be jeopardized, shall light such excavations by means of a lantern or lanterns kept lighted through the night, and he shall further provide watchmen, erect hoardings and otherwise take such precautions as may be necessary for securing the safety of the public and the protection of adjoining properties.

5. Covered drains and sewers shall be made of impervious materials, to be approved by the Building Authority, with smooth internal surfaces, such as well glazed earthenware pipes or cast-iron pipes protected against rust or corrosion by suitable asphaltic coating, and shall be so constructed as to be water-tight and air-tight. In jointing pipes with cement, tarred hemp shall be caulked into the joints before the cement is applied, and care shall be taken that no cement or other jointing material projects from the joints into the interior of the pipes, and any such projecting material or other irregularities in the bore of the drain or sewer shall be carefully removed.

6. All drains and sewers shall be laid so as to have a firm bed throughout their length. Where the bottom of the trench is in rock or similar hard substance, the pipes shall be firmly bedded in suitable selected material free from large stones and well rammed into place. Where such drains or sewers are iaid under a wall, they shall be protected by means of a relieving arch.

7. All stone-ware pipes shall be well glazed and free from cracks and flaws and shall have a thickness of not less than one-twelfth of their diameter.

8. That portion of the drain of any building which Is immediately connected with any sewer

shall (unless specially exempted by the Building Authority) be provided with a suitable and efficient intercepting trap at a point situate on the ground of the owner of the drain as distant as may be practicable from such building and as near as may be practicable to the point at which such drain is connected with such sewer. Adequate means of access shall be provided to every drain by a manhole or disconnecting chamber or other means of access to be approved by the Building Authority for the purpose of cleansing the drain. All manhole and disconnecting chambers shall be constructed of brickwork at least nine inches in thickness built in cement mortar SO as to be water tight up to the level of the adjacent ground and every drain or sewer connecting into such man- hole or disconnecting chamber shall be continued along the floor of the chamber by means of open half-channel pipes set in a bed of cement concrete. The surface of the concrete shall be raised above the edges of the half-channel pipes and shall be floated with neat cement all over so as to present a smooth and impervious surface. Where tributary drains are connected to the main channel such tributary drains shall be formed by means of curved half-channels similarly laid in concrete.

All manhole and disconnecting chambers shall be fitted with air tight covers and frames to be approved by the Building Authority.