1964_BUILDING_(CONSTRUCTION)_REGULATIONS — Page 112

B 112

CAP. 123

Building (Construction) Regulations

[1985 Ed.

[Subsidiary]

Wharves, piers and sea-walls.

PART XIII

WHARVES, PIERS AND SEA-WALLS

166. Every sea-wall, breakwater, jetty, mole, quay, wharf or pier shall be designed and constructed to the satisfaction of the Building Authority.

PART XIV

Materials and design.

L.N. 76/81.

Foundations.

Brickwork.

Masonry.

Bond courses

required.

L.N. 294/76.

RETAINING WALLS

167. (1) Retaining walls may be constructed of masonry, brick- work, or plain or reinforced concrete.

(2) Retaining walls'shall be so designed and constructed as to support safely the ground they retain and any loads and pressures from any surcharge, traffic and footings of nearby structures on top or at the back of the walls and any water pressures that may be im- posed on the back face and on the base of the walls, and to provide a safety factor of-

(a) 2.0 against overturning; and

(b) 1.5 against sliding depending on friction on ground only, or 2.0 against sliding if passive ground resistance is added to counteract sliding.

168. (1) A foundation of concrete shall be provided on solid. undisturbed ground or on piles.

(2) Such foundation shall extend for the full thickness at the base of the retaining wall, and shall be so designed that the resultant of all forces acting on the wall shall be within the middle third of the foundation, or if on piled foundation shall cause no tension in any pile.

169. Retaining walls constructed of brickwork shall be properly bonded and built solid throughout in cement mortar.

170. Retaining walls constructed of masonry may be built in cement mortar or dry. In either case the wall shall be properly bonded.

171. (1) Retaining walls constructed of brickwork or masonry exceeding 4 m in height shall be provided with 1 or more bond courses of concrete, in no respect inferior to Grade III and at least 300 mm in depth:

Provided that bond courses of reinforced concrete may be less than 300 mm in depth.

(2) The distance between the foundation and the first of such bond courses and the distance between any 2 adjacent bond courses shall not exceed 2 m measured vertically.