1985 Ed.] Building (Construction) Regulations
[CAP. 123
B 31
the Building Authority, and the Building Authority may require the group reduction factor to be decreased;
(ii) no group reduction factor shall be applied where the piles bear on rock of category 1(a), (b) or (c) of Table IX; or
(b) cause the average vertical pressures in the ground penetrated by, or underlying the piles, to exceed the allowable bearing pressures of such ground.
(4) (a) Where piles are driven through subsiding fills or other subsiding strata and derive support from underlying firmer materials, consideration shall be given to the downward frictional forces which may be imposed on the piles by the subsiding upper strata, and the bearing capacity of each pile as determined by test or calculated by formula shall be reduced by the amount of the total downward frictional force.
(6) For the purposes of this paragraph, the total downward frictional force may be estimated as the cohesion of remoulded specimens of the soils multiplied by the surface area of the pile or the full weight of the ground between and around the piles in the subsiding strata, whichever is the lesser.
(5) Where any doubt exists as to the capacity of any pile to sustain adequately and without undue settlement the load for which it has been designed the pile shall be tested by means of the imposition of a test load, which load shall be 2 times the load for which the pile was designed and which shall be maintained for 72 hours and if the total settlement recorded exceeds 15 mm the pile shall be deemed to be unsatisfactory:
Provided that in any particular case the Building Authority may direct the pile to be tested by any other method to the satisfaction of the Building Authority, in which case the standard of acceptance shall be determined to the satisfaction of the Building Authority.
(6) The authorized person or registered structural engineer shall keep or cause to be kept accurate records of materials and principal dimensions of each pile and other data relevant to the particular type of pile used and shall submit 2 copies of such records to the Building Authority.
[Subsidiary]
L.N. 294/76.
Pressure from
36. Where the ground adjacent to any building exerts pressure upon or causes the application of load to any part of that building, adjacent ground. such building shall be constructed so as to be capable of sustaining safely and transmitting that pressure or load without exceeding the appropriate limitations of permissible stresses.
37. Where footings are required to spread loads from walls to foundations, the bricks or building blocks below the base of such walls shall increase downwards by regular offsets not exceeding the thickness of the brick or building block on 1 or both sides of such walls. Such bricks or building blocks shall, where possible, be laid as headers.
Footings.
1985 Ed.] Building (Construction) Regulations
[CAP. 123
B 31
the Building Authority, and the Building Authority may require the group reduction factor to be decreased;
(ii) no group reduction factor shall be applied where the piles bear on rock of category 1(a), (b) or (c) of Table IX; or
(b) cause the average vertical pressures in the ground pene- trated by, or underlying the piles, to exceed the allowable bearing pressures of such ground.
(4) (a) Where piles are driven through subsiding fills or other subsiding strata and derive support from underlying firmer materials, consideration shall be given to the downward frictional forces which may be imposed on the piles by the subsiding upper strata, and the bearing capacity of each pile as determined by test or calculated by formula shall be reduced by the amount of the total downward frictional force.
(6) For the purposes of this paragraph, the total downward frictional force may be estimated as the cohesion of remoulded specimens of the soils multiplied by the surface area of the pile or the full weight of the ground between and around the piles in the subsiding strata, whichever is the lesser.
(5) Where any doubt exists as to the capacity of any pile to sustain adequately and without undue settlement the load for which it has been designed the pile shall be tested by means of the imposition of a test load, which/load shall be 2 times the load for which the pile was designed and which shall be maintained for 72 hours and if the total settlement recorded exceeds 15 mm the pile shall be deemed to be unsatisfactory:
Provided that in any particular case the Building Authority may direct the pile to be tested by any other method to the satisfaction of the Building Authority, in which case the standard of acceptance shall be determined to the satisfaction of the Building Authority.
(6) The authorized person or registered structural engineer shall keep or cause to be kept accurate records of materials and principal dimensions of each pile and other data relevant to the particular type of pile used and shall submit 2 copies of such records to the Building Authority.
[Subsidiary]
L.N. 294/76.
Pressure from
36. Where the ground adjacent to any building exerts pressure upon or causes the application of load to any part of that building. adjacent ground. such building shall be constructed so as to be capable of sustaining safely and transmitting that pressure or load without exceeding the appropriate limitations of permissible stresses.
37. Where footings are required to spread loads from walls to foundations, the bricks or building blocks below the base of such walls shall increase downwards by regular offsets not exceeding the thick- ness of the brick or building block on 1 or both sides of such walls. Such bricks or building blocks shall, where possible, be laid as headers.
Footings.
J
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