Hong Kong Regulations

BUILDING (CONSTRUCTION) REGULATIONS - REGULATION 27

Cast-in-place concrete foundations

(1) The concrete stresses in cast-in-place concrete foundations at
working load shall not exceed-

   (a)  the appropriate limitations of design stresses of the concrete, in the
        case of concreting in dry conditions;

   (b)  80% of the appropriate limitations of design stresses of the concrete,
        in the case where groundwater is likely to be encountered during
        concreting.

(2) Subject to the provisions of subregulation (1) the average compressive
stress on the nominal cross sectional area of cast-in-place concrete piles of
least lateral dimension not exceeding 750 mm shall not exceed 5 MPa under
working load due to dead and imposed loads and shall not exceed 6.25 MPa under
working load due to combined dead, imposed and wind loads.

(3) In-situ concrete linings in all cast-in-place concrete piles shall not be
considered as contributing to the structural strength of the foundation.
(Enacted 1990)