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diving apparatus, dredgers, barges, tanks, motor boats, and craft of every description necessary for excavating and refilling the trenches in which the pipes are to be laid, with all necessary maintenance and harbourage to the requirements of the Harbour Authorities; the necessary material, labour and plant for constructing the valve chambers, with floating plant, dredgers, pile drivers and all materials, labour and implements necessary.
The Contractors shall provide on the Kowloon side adequate yard and storage accommodation for the reception of materials supplied from overseas, the jointing, testing, and otherwise preparing of the pipes and materials required to be connected together in the pipelines, also provision for all tests on materials required to be carried out by the Engineer on the site.
Brickwork.
Granite Masonry.
MATERIALS.
8. The bricks used in lining of valve chambers to be heavy Engineering Bricks and may be of local manufacture, subject to the approval by the Engineer of samples to be deposited at the offices of the Public Works Department, Hong Kong. The bricks must be dense hard and well burned from approved source, of good shape, even in size and free from lime and other defects. All bricks to be loaded and unloaded by hand and no broken bricks shall be brought upon or used on any part of the works except where required for closing a course.
The brickwork of valve chambers to be in cement mortar built in English Bond with flat struck joints.
The glazed brick lining to be built in cement mortar with a fine struck joint not exceeding th of an inch in thickness, the bond to be three courses of stretchers and one course of headers, the backing of cement concrete being levelled up every four courses and grouted solid.
The pressed blue brick facing to be built in English Bond.
The face work to be constructed in selected bricks, picked so as to give uniform face work.
The interior of the valve houses to be faced with white glazed and selected pressed blue bricks from Farnley, or other approved makers, and to be of the highest class of the various kinds in accordance with the samples to be deposited with the Engineer and approved.
9. The exposed face of valve chambers above o·8, below Ordnance Datum to be faced with Granite Ashlar selected to match with the adjoining Sea Wall, and similarly coped.
All blocks to be fitted to place and dressed to give fine jointing, with headers forming not less than 25 per cent. of the superficial face.
The source whence the stone is to be taken to be submitted to, and approved by, the Engineer,
Special care will be required in selecting the Granite for the Ashlar facing of the valve houses It must come from a source known to give stone of an enduring nature with the colour and grain appropriate to the position and nature of the situation.
All Ashlar work to be carried out in the best, most approved and workmanlike manner, with a sufficient number of slate (or other approved material) dowels, or other means so as to adequately key the masonry.
In the case of the valve houses, detail drawings of the courses, joints and headers proposed, to be approved by the Engineer before ordering of stone, the whole to be finely dressed on exposed faces, joints and beds, to give high-class work, and each stone fitted to place before bedding. Joints to be kept uniform, approximately th of an inch in thickness, and all joints and beds grouted up solid with cement. Facework joints neatly weathered.
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