EQUIPMENT FOR INSPECTION OF OR WORKING IN HOLES.
piles shall be provided by the Contractor and operated by him in accordance with the Code of practice
relating to the safety of men working in small diameter vertical and near vertical shafts for civil
engiiicering purposes2).
TEST AND INSPEL”1’ION PLANT, FQUIPMRNT, AND INSTRUMENTS. The Contractor shall provide the plant,
equipment, and instruments required for carrying out the inspection and testing of the piles required in
terms of the specification. The plant, equipment, and instruments provided shall be subject to approval.
If the Works are subject to the provisions of the Mines and Works Act, 1956 (Act 27 of 1956), the
Contractor shall obtain approval of lifting and lowering equipment from the Chief Inspector of Mines.
(See also 4.1.1.)
Equipment for working in and inspection oi holes for
CONSTRUCTION
GENERAL
Piling Layout. The piling layout. and
a) the minimum pile size; or
b) the capacity and type of pile; or
c) both (a) and (b) above,
as applicable, together with the reinforcement and minimum concrete strength, shall be as shown on the
drawings or as specified in the project specification, or both.
The Contractor shall not alter or amend the piling layout unless authorized to do so in terms of 5.1.3.
Piling Conditions and Rate of Progress.
are indicated by the classes of material scheduled and the conditions in the substrata disclosed by the
data given in the project specification and, regardless of whether the size and type of the piles and the
piling layout are those given on the tender drawings or are in accordance with an alternative proposal
made and approved in terms of 5.1.3, the Contractor (using his proposed procedure and plant and equipment
that complies with 4.1.3) shall complete the piling installation at a rate of progress at least equal to
that stated in his tender.
Alternative Designs, Types, and Layouts
Alternatives to comply with project specification.
notwithstanding the condition that the Contractor may carry out additional tests at his own expense in
terms of the conditions of contract or in terms of 5.1.7.2, and that the Engineer may also carry out such
tests during the progress of piling, any alternative type of pile or pile layout shall comply with the
requirements of the project specification for
a) the nominal load (see 2.3) or the critical design load, i.e. the worst combination of load cases, as
detailed, acting at a designated point on the pile or pile caps, as applicable;
b) the maximum allowable deflection of the pile caps;
c) the technical data and factor of safety to be incorporated in the design of the piles or piling
layouts, or both; and
d) the applicable test load.
Details of alternative proposals.
a) Details of the piling system, including pile caps proposed.
b) Drawings showing pile and pile cap layout.
c) Calculations in sufficient detail to enable the merits of the proposals to be assessed, including a
description of the method that will be used to determine the depth to which piles will be installed.
d) A priced schedule showing details and estimated quantities o� items for which payment is required.
The scheduled items shall comply with 11.1.2 and 8.2, as applicable.
Design and construction criteria for alternative proposals.
and 5.1.3.2, the following requirements shall apply to alternative proposals for the design and
construction of the piles:
a) The design and construction of the piles shall comply with all the other relevant requirenents of the
specification and, where they are not in conflict with the said requirements, with the relevant
requirements and recomiendations of Section F of Part 3 of SABS 0120, SABS 088, and CP 2004.
b) The type, number, arrangement, and spacing of piles shall be such that the most severe combinations of
loadings can be carried safely by the piles.
c) The strength of concrete in precast and cast-in-situ piles shall be at least 25 MPa at 28 d.
d) No welding of reinforcement may take place unless approved in writing by the Engineer.
e) In the calculation of the strength of steel casing that may be allowed in the design of the pile
shaft, the actual wall thickness shall be reduced by 2 mm.
f) The Contractor shall satisfy the Engineer by means of tests (see 7.2) that the pile foundations as
designed will support the loads safely without exceeding the permissible deflection, but this shall not
absolve the Contractor from his responsibility for the adequacy of the pile foundations.
9) Notwithstanding any approval given in terms of 5.1.3.4 or 5.1.4, as applicable, the Contractor shall
provide a piling system that is adequate to deal with the conditions given on the drawings or stated in
the project Specification.
Detailed working drawings. As soon as an alternative proposal has been accepted in principle by the
Engineer, the Contractor shall, without delay. submit to the Engineer such additional detailed drawings
as are required in terms of the project specification and such details and calculations as are ordered.
After the drawings have been approved, no departure from them shall be made without the approval of the
Engineer.
Approval of Working Drawings and Proposed Piling Procedures. Except where such data have been provided
by the Contractor in terms of 5.1.3, within 4 weeks after the date of the contract the Contractor shall
submit to the Engineer for his approval full details of the proposed piles and piling procedures,
including the following, and no work of installing piles or forming holes shall comence before written
approval has been given by the Engineer:
a) The methods by which the piles and casings will be driven, or by which the holes will be formed;
b) the mass of the hammer and the height of drop in the case of drop hammers or the rated energy outptlt
in the case of power hammers;
c) the set for a stated number of blows;
d) the size of each bulbous base, if any;
e) the method of placing and compacting concrete, in the case of cast-in-situ piles;
Except where conditions occur that are less advantageous than
Subject to the provisions of 5.1.1 and 5.1.2, and
Any alternative proposal shall include the following documents:
In addition to the requirements of 5.1.3.1
....................
2) Published in 1980 by the south African Institution of Civil Engineers.
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