PART 2
CONNECTION TO FOUL WATER SEWERS AND THE CONSTRUCTION OF LATERAL DRAINS
2. Connection to foul water sewer
Where a connection is required to be made to a foul water sewer such connection shall be made as follows—
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(1) where the connection is to be made—
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(a) directly into a manhole without a drop connection the stopper of any conveniently situated joinder junction shall be cut away and the spigot of the first of the connecting pipes shall be jointed to the junction using a double collar if necessary: Provided always that if a joinder junction is not conveniently situated a neat hole shall be cut in the walls of the manhole such that the crown of the connecting pipe is level with the crown of the foul water sewer and the first of the connecting pipes shall be built into the manhole wall with its spigot flush with the inside face of the wall and the connection shall be continued and haunched inside the manhole as hereinafter described in regulation 14 of these Regulations;
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(b) into a manhole which has been provided with a drop connection the stoppers of the 2 joinder junctions provided shall be cut away and—
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(i) a rest bend shall be jointed to the lower junction and a tumbling bay junction shall be jointed to the upper junction and a vertical pipe shall connect the rest bend to the tumbling bay junction, and the rest bend, tumbling bay junction and vertical pipe shall be surrounded with concrete 6 inches thick, or
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(ii) a small chamber of internal dimensions of one foot cube shall be built against the lower of the 2 junctions in concrete with one face made monolithic with the wall of the manhole and a vertical pipe built into the roof of the chamber such vertical pipe being extended to and jointed with a square junction jointed to the upper junction, the vertical pipe and square junction being surrounded with concrete 6 inches in thickness and monolithic with the wall of the manhole;
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(c) to a square junction left for that purpose on a sewer—
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(i) the concrete surround to the junction shall be cleaned and the temporary stopper shall be carefully removed,
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(ii) a short length of concrete pipe not less than 12 inches in diameter shall be cut and connected in a watertight manner with 2 6-inch diameter pipes suitably inclined and approximately diametrically opposite to one another and the concrete pipe shall then be laid on a bed of mortar over the open vertical pipe of the junction, and any inside projection on to the junction shall be sloped up to the wall of the pipe with mortar, and
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(iii) the open end of the concrete pipe shall be sealed in a watertight manner and this improvised “Y” junction shall be surrounded with and covered with concrete 6 inches in thickness and monolithic with the concrete, if any, of the sewer: Provided always that a purpose made “Y” junction sealed at one end may be used in place of the improvised junction.
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(2) No connection shall be made on a sewer when no square junction has been left for that purpose unless the Sewerage Authority is satisfied that the watertightness of the sewer will not be prejudiced by the connection in which case sufficient pipes may be cut out of the sewer to permit of the interpolation and jointing in the sewer of a suitable junction.
3. Lateral Drain
The open end of the pipe or pipes forming a connection to a foul water sewer shall be jointed to a line of pipes laid in a manner similar to that hereinafter described for drains and extending to a lateral drain manhole constructed in a manner hereinafter described in a suitable position, generally near the boundary of the road opposite, to the point of connection to the foul water sewer, and such manhole shall be provided with a sufficient number of joinder junctions effectually to connect to all drains likely to be laid in the vicinity and the lateral drain shall be extended from this manhole in a direction parallel with that of the sewer to a position capable of receiving the drain from the most remote building likely to drain into that lateral drain. The lateral drain shall terminate with a bend to facilitate the entry of the furthermost drain and it shall be provided with suitable junctions or joinder junctions to permit of other drains or anticipated future drains connecting therewith. Watertight seals shall be provided to all pipes and junctions not immediately to be connected to drains.