B 32
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
[Subsidiary]
Caissons.
L.N.42/75.
L.N. 42/75. L.N. 294/76.
Grouting,
38. (1) All caissons shall be constructed of plain or reinforced concrete not inferior to that designated as Grade IIIA in regulation 19.
(2) Where underground water is encountered during concreting the permissible unit compressive stress under the maximum load from the superstructure, and all other loads, including negative frictional forces, shall not exceed 80 per cent of the permissible direct compressive stresses of concrete as specified in regulation 116 or 157.
(3) Where dewatering is to be undertaken the procedure for carrying out this operation and any precautionary measures to avoid settlement of any adjoining buildings, streets or land shall be to the satisfaction of the Building Authority.
(4) Excavation for caissons shall be carried out with due precautions to prevent the migration of subsoil.
(5) Where any doubt exists as to the capacity of any caisson to sustain, adequately and without undue settlement, the load for which it has been designed the caisson shall be tested-
(a) by means of core drilling of the completed in-situ concrete,
in which case-
(i) the core drilling shall be taken through the full depth of the caisson:
(ii) the core drilling shall be carried down to not less than 600 mm into the ground upon which the caisson is founded:
(iii) the completed core so taken shall be properly marked and arranged in order for inspection on site by representatives of the Building Authority; and
(iv) the necessary crushing tests shall be carried out by an independent testing authority; or
(b) by any other method to the satisfaction of the Building Authority, in which case, the Building Authority shall determine the standard of acceptance to be adopted.
(6) The authorized person or registered structural engineer shall keep or cause to be kept accurate records of--
(a) materials used in, and principal dimensions of, each caisson constructed;
(b) soil layers excavated; and
(c) all tests carried out on the bearing strata or the concrete laid.
and shall submit 2 copies of such records to the Building Authority.
39. (1) Where improvement of ground bearing capacity under the foundation is to be achieved by grouting the ground under the foundation with cement or other mixtures, adequate proof of the suitability of the method and materials to be used shall be given to the satisfaction of the Building Authority.
B 32
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
[Subsidiary]
Caissons.
L.N.42/75.
L.N. 42/75. 1.N. 294/76.
Grouting,
38. (1) All caissons shall be constructed of plain or reinforced concrete not inferior to that designated as Grade IIIA in regula- tion 19.
(2) Where underground water is encountered during concret- ing the permissible unit compressive stress under the maximum load from the superstructure, and all other loads, including negative frictional forces, shall not exceed 80 per cent of the permissible direct compressive stresses of concrete as specified in regulation 116 or 157.
(3) Where dewatering is to be undertaken the procedure for carrying out this operation and any precautionary measures to avoid settlement of any adjoining buildings, streets or land shall be to the satisfaction of the Building Authority.
(4) Excavation for caissons shall be carried out with due precautions to prevent the migration of subsoil.
(5) Where any doubt exists as to the capacity of any caisson to sustain, adequately and without undue settlement, the load for which it has been designed the caisson shall be tested-
(a) by means of core drilling of the completed in-situ concrete,
in which case-
(i) the core drilling shall be taken through the full depth of the caisson:
(ii) the core drilling shall be carried down to not less than 600 mm into the ground upon which the caisson is founded:
(iii) the completed core so taken shall be properly marked and arranged in order for inspection on site by representatives of the Building Authority; and
(iv) the necessary crushing tests shall be carried out by an independent testing authority; or
(b) by any other method to the satisfaction of the Building Authority, in which case, the Building Authority shall determine the standard of acceptance to be adopted.
(6) The authorized person or registered structural engineer shall keep or cause to be kept accurate records of--
(a) materials used in, and principal dimensions of, each cais-
son constructed;
(b) soil layers excavated; and
(c) all tests carried out on the bearing strata or the concrete
laid.
and shall submit 2 copies of such records to the Building Authority.
39. (1) Where improvement of ground bearing capacity under the foundation is to be achieved by grouting the ground under the foundation with cement or other mixtures, adequate proof of the suitability of the method and materials to be used shall be given to the satisfaction of the Building Authority.
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