National Productivity and Quality Specifications
(NPQS)
C4-20 Driven Piling
NPQS
C4-20 Driven Piling
CONTENTS
Page
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1.
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GENERAL
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3
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1.1
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Scope
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3
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1.2
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Related Sections
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3
|
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1.3
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Standards and Regulations
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3
|
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1.4
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Trade Preambles
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4
|
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1.5
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Definitions
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8
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2.
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PERFORMANCE REQUIREMENTS
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8
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2.1
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Requirements
for Design Verification
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8
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2.2
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Performance Criteria for Piles Under
Test
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8
|
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2.3
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Driving Requirement
|
9
|
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2.4
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Permissible Damage Criteria for Existing Critical Structures or Services
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9
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2.5
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Noise Nuisance
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10
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3.
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MATERIALS
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11
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3.1
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Pile Sections and Pile Dimensions
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11
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3.2
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Precast Reinforced Concrete Piles Including Spun Piles
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11
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3.3
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Steel Piles
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12
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3.4
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Treated Timber Piles
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13
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3.5
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Proprietary Micropiles
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15
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3.6
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Pile Shoes and Toes
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15
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4.
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WORKMANSHIP
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16
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4.1
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Fabrication of Piles: Concrete Piles
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16
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4.2
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Fabrication of Piles: Steel Piles
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16
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4.3
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Handling and Pitching of
Driven Piles
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17
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4.4
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Installation and Driving
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18
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4.5
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Welding
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21
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4.6
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Damaged Piles
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21
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4.7
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Tolerances
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21
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4.8
|
Pile Heads
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21
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4.9
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Non-Performance of Working Piles
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22
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4.10
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Noise and Disturbance
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22
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5.
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VERIFICATION AND SUBMISSIONS
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23
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5.1
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Submissions
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23
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5.2
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Inspection and Test Certificates
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24
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5.3
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Tests
|
25
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5.4
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Pile Testing
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25
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5.5
|
Records
|
26
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NPQS
C4-20 Driven Piling
Read with the General Requirements section, and all other
contract documents.
1.1 Scope
This section covers the requirements for the construction of driven piles, including the use of the following pile types:
a. Precast Concrete Driven Piles
b. Precast Prestressed Spun Piles
1.2 Related Sections
Read this work section in conjunction with the relevant requirements of the other work sections as follows:
C1-20 Condition Survey and Monitoring
C2-10 Site Investigation
C2-50 Instrumentation and Monitoring
C4-30 Pile Testing
C3-10 Concrete Construction Generally
C3-20 Reinforcement
C3-60 Precast Concrete Works
C5-10 Structural
Steelwork
C5-20 Protective Works for Structural
Steelwork
C8-10 Structural Timberwork
1.3 Standards and Regulations
1.3.1 Standards
Unless otherwise agreed by the SO, ensure all of the Works comply with the relevant requirements of the Standards and Codes listed below or referenced in the body of the Specification. Alternative Standards and Codes may be proposed for approval by the
SO, provided it can be demonstrated that the alternative Standards and Codes comply with the requirements of the standards specified. All Standards and Codes quoted are
the
current version,
unless specific year references are noted.
Singapore Standards
SS 72 Treatment of timber and plywood with copper/chrome/arsenic wood
preservatives
SS 187 Qualification test for
manual metal-arc welders
SS CP 1 The use of
timber in building construction
SS CP 4: 2003 Code of Practice for Foundations
NPQS
C4-20 Driven Piling
SS CP 7 Structural use of
timber
SS CP 65:
Part
1 Structural use of concrete -
Design and Construction
SS
CP 79 Safety management system
for construction worksites
Other Standards
API 5L Line pipe
BS 1560-3.2 Circular flanges for pipes, valves and fittings (class designated).
Steel, cast iron and copper alloy flanges.
Specification for cast iron flanges
BS 3100 Specification for steel casting for
general engineering purposes
BS EN 1011 Welding- Recommendation for welding of metallic materials
BS 6265 Specification for steel butt-welding pipe fitting for the petroleum
industry. Wrought and cast austenitic chromium nickel steel fittings
BS 7079 Preparation of
steel substrate before application
of
paints and related products - tests for
the
assessment of surface cleanliness
BS 8004 Code of practice for foundations
BS 8008 Guide to safety precautions and procedures for the construction and
descent of machine-bored shafts for piling and other purposes
BS EN 10025 Hot rolled products of non-alloy structural steels-Technical delivery
condition
BS EN 10113 Hot rolled products in weldable fine grain structural steel
BS PD 5500 Specification for unfired fusion welded pressure vessels Building
Control Regulations 1990
SIS 05 59 00 Swedish Standard.
Pictorial
surface
preparation
standards for painting steel surfaces
In the event that the Standards or Codes are revised or superseded, refer to the latest edition or the appropriate substitution for
the
relevant subjects.
1.3.2
Technical References
Refer to the following technical reference for guidance in carrying out
the
works:
a. BRE Digest 251
(1995) Assessment of damage in low-rise building.
1.4 Trade Preambles
1.4.1
Design Verification
The piling design and details of the project are shown in the drawings. Based on the information,
engage suitably qualified personnel to carry out:
a. Design verification checks based on actual
ground conditions to determine the
required length of each
pile and ensure that the specified
working
load and settlement
criteria of
the
piles are achieved.
NPQS
C4-20 Driven Piling
b. Proposals to amend the design including compensating piles as necessary in the
event that for any reasons the installed piles do not perform as design intended.
c. Proposals to amend the pilecap design of the building in the event that
the
piles are installed out of
the
permitted construction tolerance.
d. Proposals as a response plan in the event that measures taken to control ground
movement and
vibration do not
perform satisfactorily.
Take into account
of the design requirements as set out in Clause
2 below.
Submit the design to the SO for acceptance. Design proposals in (b) and (c) are
to
be endorsed by a Singapore Professional Engineer – PE (Civil).
1.4.2 Contractor’s Proposals
1.4.2.1
Proposals on Driving Equipment
Propose for SO’s acceptance, suitable
driving
equipment
for
the works.
Take
into
account of the suitability, efficiency and energy of
the
driving equipment.
Submit calculations on proposed piles set and rebound control for SO’s acceptance.
1.4.3 Building Damage Assessment
Carry out a Building Damage Assessment on the effects of ground movement to
the neighbouring properties due to the works, for the purpose of establishing suitable values for ‘Alert’ and
“Work Suspension’ levels for monitoring. Submit to
SO
with endorsement
from a PE (Civil).
1.4.4 Coordination with Other Works
Co-ordinate with other
contractors who may carry out
other works at the same time at the
site. Take
into account of site access, space occupation, safety and safeguarding of
adjacent properties and each other’s works.
1.4.5 Condition Survey
Where applicable, prior to and upon completion of the site works, carry out a condition
survey
to adjacent buildings in accordance with the requirements of Section C1-20
“Condition Survey
and Monitoring”. Submit all records to the
SO
and adjacent property owners where directed.
Keep a copy of the survey report on site ready for inspection.
1.4.6 Instrumentation and Monitoring
Provide instrumentation to monitor the
ground
movement, vibration and condition of
adjacent properties. Refer
to Section
C2-50, clause
3.1, and the
drawings for the schedule of instrumentation required. If necessary
or as required by
the
authorities,
propose and provide additional instrumentation and monitoring for records.
Take cognisance of and co-ordinate with other contractors on site who may
be carrying out instrumentation and monitoring works to avoid duplication
of
installation and readings.
For general requirements of the instrumentation and monitoring works refer to Section
C2-50.
1.4.7 Upholding of Adjoining Properties
NPQS
C4-20 Driven Piling
Accept responsibility for the upholding of the adjoining buildings and roads, footpaths
etc., where applicable, together with the mains and services from the time of taking
possession of the site through the duration of the works.
Adequately maintain roads and footpaths within and adjacent to the site and keep clear of mud and debris.
1.4.8 Verification of Site Information
1.4.8.1
Site Surveys
Verify
and be satisfied
that the information given in
the existing
site survey plans provided are accurate. If necessary, engage a registered Surveyor to carry out additional site survey before commencing any work.
1.4.8.2
Additional Site Investigations
Carry out additional
ground investigation where additional information is needed for the works or when directed by the SO. Carry out the works in compliance with Section C2-10 “Site Investigation”.
Carry out the boreholes progressively prior to
commencement of the works in areas
according to
the contractor’s construction programme. On completion of drilling, backfill
the
boreholes with a suitable bentonite / cement mix.
Submit the location
and schedule for the boreholes to SO’s acceptance prior to carrying
out the works. On completion, prepare the site investigation report and submit to
the
SO for acceptance.
1.4.9 Existing Services Affected by the Works
Refer to Preliminaries and conditions
of contract
for
the requirements to
deal
with existing at grade and underground services affected by the works.
1.4.10 Site Protection
Protect all equipment and working area using fencing or other methods as accepted.
1.4.11 Obstructions
If any obstructions such
as
existing
fences,
structures, footings, boulders, concrete blocks, pipes, drains, driveways or ramp are encountered
during excavation, submit
proposals for their removal for the SO's acceptance.
1.4.12 Supervision of the Works
Engage a competent and suitably
experienced site engineer to the
SO’s acceptance, to supervise the field works.
1.4.13 Welders’ Qualifications
Engage only welders who are qualified in
the
accepted welding procedure
in
accordance with SS 187 and have a proven record over the previous six months, or who have
attained an equivalent standard, on the Works. Provide copies of certificates relating to welders' tests to the SO on request.
NPQS
C4-20 Driven Piling
1.4.14 Quality Control Plan
Submit and work to a quality control plan as agreed with the SO. Refer to the General
Requirements section,
clause 1.4.10 for guidance.
1.4.15 Safety
Provide safety precautions to comply with all current legislation and regulations, notably:
a. Building Control Regulations
b. Code of Practice for Traffic Control at Work Zone
c. Factories (Building
Operations
and
Works of Engineering
Construction) Regulations
d. Factories Act
e. SS CP 79 Safety management
system for construction worksites
f. For works within LTA Railway Protection Zone, ensure the works comply fully with
Code of Practice for Railway Protection
Additionally, comply also with the following:
a. BRE Digest
251 (1995) Assessment of damage in low rise building
b. BS 8008: Guide to safety precautions and procedures for the construction and
descent of machine-bored shaft for
piling and other purposes
1.4.16 As-Built Pile Surveys
Employ a Licensed Surveyor who is to be responsible for surveying pile locations and eccentricities and submit the As-Built survey to the SO in
format as directed within 14 days after the piles have been trimmed to the cut-off level.
1.5 Definitions
a. Pile Coating
The term
‘coating’
includes the primer
and the numbers of other
coats specified.
NPQS
C4-20
Driven Piling
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