Table of Contents
1. General
2. Materials
3. Concrete
4. Manufacture of Piles
5. Transport
1.General
1.1 Scope
This specification covers the requirements for the manufacture of pre-cast reinforced concrete piles. Items not specifically covered herein or in the codes, regulations and construction drawings referred to shall be determined in accordance with good engineering practice and to the satisfaction of Company.
1.2 Definitions
For the purpose of this specification the following definitions shall apply:
“Company” shall mean the Company Construction Superintendent, or his appointed representative. “The Contractor” shall mean the organization appointed by Company to execute the work or part of the work covered by this specification. “Approved” shall mean approved by Company. “Approved equal” shall mean of equal quality and properties and approved by Company.
1.3 Codes, Standards and Regulations
The latest editions of the codes, standards and regulation listed below and also those further mentioned in this specification shall be strictly applied.
1.4 Supplementary Documents
This specification shall be read in conjunction with the various contract documents and the construction drawings issued by Company.
2. Materials
2.1 Cement
The cement to be used shall be It shall comply in all respects with <engineer to complete>
2.2 Aggregates and Water
Aggregates and water shall comply in all respects with the code mentioned in clause 1.3.
2.3 Reinforcing Steel
Shape and quality of reinforcing steel shall comply with <engineer to complete>
3. Concrete
3.1 Quality and Composition
3.1.1 The concrete shall have a compression strength of N/mm2 <engineer to complete> ( kgf/cm2 ) at 28 days, determined on standard cubes.
For definition of compression strength see clause 3.3.5.
3.1.2 The composition of the concrete shall be in accordance with the code mentioned in clause 1.3.
3.1.3 The cement content shall be not less than kg/m3 of concrete
3.1.4 Admixtures shall not be used, unless specifically approved by Company.
3.2 Curing
The curing of the concrete shall be in accordance with the code mentioned in clause 1.3.
3.3 Tests
3.3.1 Standard compression test s shall be made in accordance with the code mentioned in clause 1.3.
3.3.2 Unless satisfactory evidence of strength is produced from reliable sources, to the satisfaction of Company, preliminary compression tests shall be made both prior to the commencement of the work and subsequently whenever any important change is to be made in the materials or in the proportions of the materials to be used.
Such a test shall consist of 6 cubes, of which 3 shall be tested at 7 days and 3 at 28 days.
3.3.3 During the manufacture of the piles, 2 sets of 3 cubes shall be made per 40 piles, for the compression tests. However not less than 6 cubes shall be made for each 100m3 of concrete.
The cubes shall be marked with the date of manufacture.
3.3.4 The cubes shall be tested by an independent laboratory, approved by Company. The records of the test results shall be submitted in two-fold to Company.
The standard of acceptance shall be in accordance with <engineer to complete>
4. Manufacture of Piles
4.1 General
4.1.1 The piles shall be manufactured in accordance with the construction drawing supplied by Company.
4.1.2 The concrete cover to the outermost reinforcing bars shall be 30 mm.
4.1.3 The corners of the pile shafts and heads shall a chamfer of 20 x 20 mm.
4.1.4 Each pile shall be marked with the date of manufacture, support points and pick-up point(s).
4.1.5 Each pile shall be cast in one continuous operation.
4.2 Tolerance
4.2.1 The piles shall be straight. The maximum permitted deviation of the pile axis from a straight line is 1 mm per linear metre of pile.
5. Transport
5.1 General
5.1.1 The piles shall not be transported to the job site until the cubes have been tested and have met the strength requirements laid down in clause 3.1.1. If the first set has met these requirements, the second set does not need to be tested.
A deviation from these requirements shall only be permitted when the Contractor has obtained the specific agreement of Company.
5.2 Inspection
5.2.1 Company shall inspect each pile when it is delivered on the job-site. Piles damaged to such an extent that, in the opinion of Company, their structural strength is impaired, or likely to be impaired during the driving, shall be rejected.
Appendix to The Standard Specification for The Manufacture of Pre-Cast Reinforced Concrete Piles
NOTE: This document is for internal use only.
A.1. General
A.1.1. Scope
The standard specification for the manufacture of pre-cast reinforced concrete piles, BN-SP-JL3 shall be used as a basis for the job specification. Where necessary, clauses shall be modified to comply with client’s requirements or to suit local conditions. However, no commercial clauses shall be added, since these belong in the commercial contract documents. This specification is written for the case that the piles are manufactured by qualified people on a well equipped prefab-yard. If the piles will be prefabricated on the job site or under similar conditions, specification BN-SP-JL3 is not adequate In that case also the following clauses of the civil construction work BN-SP-J2 should be made applicable: clause 5.0 (except 5.6) clause 6.0 clause 7.0 clause 8.0 (except 8.6; 8.7; 8.10.1 ) In this appendix the specification clause numbers are preceded by the letter “A”.
A.2. Materials
A.2.1. Cement
If the piles are manufactured on a modern prefab-yard the use of a rapid-hardening cement, such as portland cement class C will normally be acceptable. If, however, the piles are made under less favourable conditions the use of rapid-hardening cement should be limited to class B. It should be noted that in some countries blast furnace cement could be of a lesser quality than portland cement. For quality and tests on cement refer to the applicable local code or standard. (See BN-SP-J2 APP).
A.2.2. Reinforcing Steel
For quality and shape of reinforcing steel refer to the applicable local code or standard (See BN-SP-J2 APP).
A.3. Concrete
A.3.1. Quality and Composition
A.3.1.1. The required compression strength at 28 days to be specified, depends on the definition of this strength in the applicable code. (See also clause A.3.3.5).
The average compression strength at 28 days should not be less than 40 N/mm 2 (400 kgf/cm 2 ).
A.3.3.5. For the standard of acceptance reference should be made to the relevant clauses of the applicable code.
A.4. Manufacture of Piles
A.4.1. General
A.4.1.1. Prefabricated piles should be designed by Company.
The vendors should be given the opportunity to offer also an alternative pile.