B 30
CAP. 123]
Building (Construction) Regulations
[Subsidiary]
[1985 Ed.
(c) be driven or constructed, in accordance with the design of
the foundation and type of pile, to the satisfaction of the Building Authority and, in the case of driven piles, be driven in such a manner so as not to damage the material of the pile or any adjacent piles;
(d) be spaced from adjacent piles at not less than the perimeter of the pile or 1 m, measuring in each case from centre to centre, whichever is the greater:
(e)
Provided that--
(i) in the case of piles bearing on rock, the spacings may be reduced to not less than 750 mm or 2 times the least width of the pile, whichever is the greater; and
(ii) where any pile has been placed incorrectly, any displacement of the pile exceeding 75 mm in plan from the designed position shall be taken into account in the foundation design;
in the case of precast reinforced concrete piles, be designed and constructed so that the handling stresses do not exceed the permissible stress in bending for concrete and reinforcement specified in Table XXVII and XXIX respectively and so that the driving stresses do not exceed 2 times the permissible stress in direct compression specified in Table XXVII:
(f) if of timber, be---
(i) stripped of bark and treated with an approved preservative process; and
(ii) after driving and before the capping is placed, be cut to sound wood at the top end so that the cut off level is below the probable permanent ground water level:
(g) be capped with plain or reinforced concrete of quality not
inferior to that designated Grade III in regulation 19; and
(h) be adequately restrained against lateral movement at the
top of the pile.
(2) Piled foundations shall be designed and constructed so as to carry safely all dead and imposed loads on the foundations and any lateral loading to which the foundations may be subjected.
(3) Where 5 or more piles are placed in such proximity that the capacity of the piles to sustain loading may be affected by other piles a pile group shall be deemed to exist and the allowable load on any group of piles shall not---
(a) exceed the sum of the safe bearing capacities of the piles in
the group multiplied by a group reduction factor of 0.85:
Provided that---
(i) in special circumstances and having regard to the nature of the ground and the size of the group, the group reduction factor may be increased with the approval of
Page 30
Page 31
B 30
CAP. 123]
Building (Construction) Regulations
[Subsidiary]
[1985 Ed.
(c) be driven or constructed, in accordance with the design of
the foundation and type of pile, to the satisfaction of the Building Authority and, in the case of driven piles, be driven in such a manner so as not to damage the material of the pile or any adjacent piles;
(d) be spaced from adjacent piles at not less than the perimeter of the pile or I m, measuring in each case from centre to centre, whichever is the greater:
(e)
Provided that--
(i) in the case of piles bearing on rock, the spacings may be reduced to not less than 750 mm or 2 times the least width of the pile, whichever is the greater; and
(ii) where any pile has been placed incorrectly, any displacement of the pile exceeding 75 mm in plan from the designed position shall be taken into account in the foundation design;
in the case of precast reinforced concrete piles. be designed and constructed so that the handling stresses do not exceed the permissible stress in bending for concrete and reinforcement specified in Table XXVII and XXIX respec- tively and so that the driving stresses do not exceed 2 times the permissible stress in direct compression specified in Table XXVII:
(f) if of timber. be---
(i)/ stripped of bark and treated with an approved preservative process; and
(i) after driving and before the capping is placed, be cut to sound wood at the top end so that the cut off level is below the probable permanent ground water level:
(g) be capped with plain or reinforced concrete of quality not
inferior to that designated Grade III in regulation 19; and
(h) be adequately restrained against lateral movement at the
top of the pile.
(2) Piled foundations shall be designed and constructed so as to carry safely all dead and imposed loads on the foundations and any lateral loading to which the foundations may be subjected.
(3) Where 5 or more piles are placed in such proximity that the capacity of the piles to sustain loading may be affected by other piles a pile group shall be deemed to exist and the allowable load on any group of piles shall not---
(a) exceed the sum of the safe bearing capacities of the piles in
the group multiplied by a group reduction factor of 0.85:
Provided that---
(i) in special circumstances and having regard to the nature of the ground and the size of the group. the group reduction factor may be increased with the approval of
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