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PLN DOC.No
PT. PLN (PERSERO)
OUTLINE PILING LOADING TEST for COAL UNLOADING JETTY
REV DATE DESCRIPTION PRED CHKD REWD APPD
A 2009-07-02 ISSUE FOR REVIEW BNY SGN NDK HPS
SIGNATURE DATE
APPROVED
REVIEWED
Project: PLTU 3 BANGKA BELITUNG
2x30 MW Contract No. PJ/041/DIR/2008
Stage:
Detail
CHECKED
PREPARED DOCUMENT No.
2B0801-CA/C/T1100-07 REV:
A
CONSORTIUM OF
PT.TRUBA ALAM MANUNGGAL ENGINEERING SFECO GROUP
DESIGN CONSULTANT
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TABLE OF CONTENTS
1.
FOREWORD.............................................................................................................3
2. ENGINEERING GEOLOGY
EXPLAIN.................................................................3
2.1. GENERAL CONDITION
.....................................................................................3
2.2. THE STRATUM
CONDITION.............................................................................4
2.3. BEARING CAPACITY AND ES OF
STRATA.....................................................5
3. PURPOSES OF PILE
TEST.....................................................................................9
4. CONTENT AND METHOD OF TEST
PILE..........................................................9
4.1. LAYOUT OF TEST PILES
...................................................................................9
4.2. CONTENT AND AMOUNT OF TEST PILE
......................................................10 4.3.
TECHNICAL REQUIREMENTS
.......................................................................11
4.4. EXPERIMENT OF TEST
PILE...........................................................................12
5. CONSTRUCTION OF TEST PILES
.....................................................................14
6. ACHIEVEMENTS OF TEST
.................................................................................15
6.1. INTEGRATION REPORT OF TEST PILE
.........................................................15 6.2.
INDIVIDUAL REPORT OF TEST AND
CONSTRUCTION..............................15
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1. FOREWORD
The project is located at Air Anyer Village, Merawang District,
Bangka Regency, Bangka Belitung Province, which located in left
side Baturusa river 700m from mouth of river, approximately 6km
away from the Municipality of Pangkal Pinang.
The plant will consist of two (2) units, having turbine
generator net output of single figure in the range of 30 MW each.
The commercial Operation Date (COD) and handover for the first unit
of the plant shall be in Twenty-four months. The next units COD
shall be in Twenty-six months.
This proposal the location of piling test at the Jetty structure
area, there are two
(2) unit fixed grab crane standing on the jetty platform. Base
on EPC contract the jetty structure foundation to be used pile
foundation. According to the EPC contract the jetty platform should
be used steel pipe pile material with diameter 609mm. The work
scheme of pile loading test prepared according ASTM 1143-81
Standard test method for piles under static axial compressive load,
ASTM D-
4954-1996 Standard test method for High-Strain dynamic testing
of piles, ASTM D-3669 Method of testing individual piles under
static axial tensile load, ASTM D-3966-90 Standard test method for
piles under lateral load and Contract document Book III clausal
4..4.2.4.5. Pile testing for this project
2. ENGINEERING GEOLOGY EXPLAIN 2.1. GENERAL CONDITION
The ground elevation of the plant site is about -2.40 m on the
benchmark of
local MSL. The bore holes and static cone penetration tests CPT)
have been
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arranged in this geotechnical engineering investigation, and
standard
penetration tests (SPT) have been done in the boreholes.
2.2. THE STRATUM CONDITION
According to the test data of the boreholes and SPT from/below
the ground surface to underground about 30 meters, the layers
distributed as below:
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2.3. BEARING CAPACITY OF PILE According to the investigation
information and pile axial compression capacity
curve of steel pipe pile 609mm, the worst ultimate bearing
capacity of pile with length between 22 ~24m is about 2250kn or and
the maximum lateral forces is 200kn see below curves. The maximum
design limitation bearing
capacity of pile for axial compression load is 1100kn and
maximum lateral forces 70kn.
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3. PURPOSES OF PILE TEST
3.1. Whether the position of test pile at offshore need to be
consider equipment or method for test, craftwork and technical
requirements can meet the project requires will be checked up.
3.2. The vertical bearing capacity of single pile will be
identified to provide design basis for design of engineering
pile.
3.3. The horizontal bearing capacity of single pile for609 steel
pipe piles will be identified to provide design basis for design of
engineering pile.
3.4. The integrality of welding steel pipe piles will be checked
up through low strain dynamic test.
3.5. The validated datum of contrast between dynamic test and
static test will be established by high strain dynamic test to
calculate the feature value of vertical bearing capacity of
engineering pile in order to provide contrast datum for
engineering pile tests.
4. CONTENT AND METHOD OF TEST PILE
4.1. LAYOUT OF TEST PILES One point of test pile layout of test
pile is show in attached drawing a pile 609mm steel pipe pile and
the other are some anchor piles for test pile. The test pile layout
is show attached drawing in appendix (dwg no 2B0801-T1100-04) If
the contractor of pile test adopts other equivalent method of test,
he will decide if anchor piles are needed for test.
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4.2. CONTENT AND AMOUNT OF TEST PILE Testing piles should be
conducted according ASTM code as above and PLN contract document or
other equivalent regulations that are not lower than above
mentioned codes. Elevation of test pile head is +2,89m that is
based on the benchmark of the local MSL. The soil around piles
should be excavated to elevation of -6,64m (from MSL) before pile
test, or contribution of soil above El. -6.64m should be deducted
from bearing capacity calculation. Low strain dynamic test, high
strain dynamic test, vertical compression dead-
load test and horizontal dead-load test shall be conducted for
test pile. Specific content and amount of test pile are listed in
tables 2 and 3.
Table 2 List of content and amount of test pile
No. Spec (mm)
( m ) Depth of pile
entering into
bearing stratum
Pile-bearing stratum
Estimated length of pile (m)
(kN) Estimated ultimate vertical bearing capacity
(kN) Estimated lateral
capacity limit
Vertical dead-
load test
Lateral dead-
load test
Low strain
integrity test
High strain dynamic test
SZ4
609 1.0 SPP 22~24 2200 140 T T T T
MZ*
609
28*(0) T
Total: 1 1 5* (1) 1*(1) Note: estimate ultimate vertical bearing
capacity is 200% x design load.
Table 3 Summary of test items
Test item Quantity Frequency No. of piles Vertical dead-load
test 1 1 SZ4 Dead-load
test Horizontal dead-load test 1 1 SZ4
Low strain dynamic test 5*(1) 1 SZ4 MZ16MZ19* Dynamic test
High strain dynamic test 1 1 SZ4
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4.3. TECHNICAL REQUIREMENTS
4.3.1. Selection of piles
The ultimate value of vertical bearing capacity, uplift capacity
and horizontal capacity of single pile are estimated according to
the geotechnical data from PT
Soilent and in this case taken the extreme condition at SPT 49
which listed in Table 2.
4.3.2. Steel Pipe Piles
The steel pipe piles for the coal jetty shall be spiral welded
with size 609 mm outside diameter with minimum thickness is 9.5 mm,
the piles will be produced meet at least one of the following
specification :
a. API 5L b. ASTM A-53 (with mill certificates to confirm
minimum yeild strength c. ASTM A-252 with the following provision
:
- Chemical analysis of material shall show that both the
equivalent
carbon content and total carbon content are less than 0.30% -
Unless spiral welds are certified as conforming to the
requirement
of ASTM A53 or API 5L-1980, weld shall be 100% inspected by
ultrasonic or electromagnetic inspection according to the
requirement ASTM A53
- The pipes joint shall be fully penetration weld. All weld
shall be inspected by ultrasonic or electromagnetic inspection with
100% for the first 3m of weld for each position for each
welder.
Thereafter, shall be random spot examination of 1 pile joints
for each additional 10 piles joint of weld, If any random spot
fails to meet the acceptance standard, 2 additional random shall be
examined at locations on each pile joints from the failure
random
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spot, if still fail to meet the acceptance standard, the entire
welds
of 10 pile joints shall be completely examined. Welding practice
and qualification of fabricator shall conform to the
requirement of American Welding Society (AWS) Welding code AWS
D1, 1-86. Product shall have quality certification and
qualification certificate ex factory.
4.4. EXPERIMENT OF TEST PILE Experiments of test pile will be
conducted according to ASTM 1143-81 Standard test method for piles
under static axial compressive load, ASTM D-
4954-1996 Standard test method for High-Strain dynamic testing
of piles, ASTM D-3669 Method of testing individual piles under
static axial tensile load and ASTM D-3966-90 Standard test method
for piles under lateral load
4.4.1. Vertical dead-load compression test of pile The vertical
dead-load compression test of pile will be conducted according
to ASTM 1143-81 Standard test method for piles under static
axial compressive load
The persistent slow speed load method is adopted in the test.
The second grade load will be applied before settlement of the
first grade load is stable. The third grade load will be applied
before settlement of the second grade load is stable and so on
until 200% design load. Every grade load is 25 percent of estimated
bearing capacity limit per single pile. The first grade load can be
added according to double split grade load.
The reading will be observed at the time of 10min, 20min, 30min,
40min, 50min, and 60min within the first hour of load that is added
during every grade, and then once observation is conducted per
30min.
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Criterion of settlement stable: the settlement shall not exceed
0.25mm per hour, and does not occur twice continuously. (The
calculation is based on thrice continuous observed value within 1.5
hour ). Conditions to stop adding load: When one of following
conditions occurs, adding load may be stopped.
a) Settlement of certain grade load is fivefold settlement under
the action of the load in front of one grade;
b) The steep dropping section on Load-Settlement Curve (Qs) can
be used to determine bearing capacity limit, and the total
settlement of pile head exceeds 80mm;
c) The settlement under the action of certain grade load is
large than twice settlement under the action of the load in front
of one grade, and the settlement cant be stable 24 hours late;
d) Tensile force of anchor piles exceed the limit value of
uplift capacity, or load reaches yield strength of pile body.
The unloading and observation of unloading settlement: The
unloading value is twice of adding load value. The residual
settlement will be observed at the time
of 15min after certain unloading grade. After twice observation,
the third observation will be conducted 30min late, and then the
load of one grade is
unloaded. Last observation is done at the time of 3~4 hour after
entirely unloading.
4.4.2. Lateral dead-load test of single pile The test will be
conducted according to ASTM D-3966-90 Standard test method for
piles under lateral load. a) The lateral load as 25% of estimated
vertical bearing capacity limit will be
applied to pile head by oil jack, using anchor piles steel beam
reaction set. Then lateral load will be applied by lateral oil
jack.
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b) The single direction polycyclic adding load and unloading
method is adopted. Every grade load is 25 percent of estimated
bearing capacity limit of single pile. The first grade load can be
added according to double split
grade load. The load of each grade shall be maintained
constantly. The reading will be observed at the time of 10min,
20min, 30min, 40min,
50min, and 60min within the first hour of load that is added
during every grades.
c) Displacement observation: The reading will be observed at the
time of 5min, 10min, and 15min within the first hour of every grade
load, and then once observation is conducted per 30min, as well as
the records shall be made. Until the displacement of one hour does
not exceed 0.1mm, and twice
occur continuously, the stability is thought to be reached.
Then, the load of next stage can be added.
d) The lateral bearing capacity limit for per single pile is
submitted when the horizontal displacement of test pile is 10mm and
30mm. Adding load stops
when the horizontal displacement is bigger than 30mm.
4.4.3. Dynamic test of piles (for Unused Pile) The high strain
dynamic test is adopted and the test will be conducted according as
ASTM D-4954-1996 Standard test method for High-Strain dynamic
testing of piles
5. CONSTRUCTION OF TEST PILES A properly construction should
serve as an adequate pile cap for testing purpose including
supporting construction to withstand load during testing, the
construction of test piles should be conducted according to ASTM
1143-81 Standard test method for piles under static axial
compressive load, ASTM D-
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3669 Method of testing individual piles under static axial
tensile load and ASTM D-3966-90 Standard test method for piles
under lateral load
6. ACHIEVEMENTS OF TEST The integration report of test pile is
mainly served for providing engineering design parameters of piles.
Achievements of test will be assessed combining
CPT, DPT and other original test method.
6.1. INTEGRATION REPORT OF TEST PILE Integration report of test
pile will include following contents:
a) Limits of vertical bearing capacity and horizontal bearing
capacity of test piles;
b) Load-Settlement Curve, Load-Displacement Curve; c) Dynamic
test result of piles
6.2. INDIVIDUAL REPORT OF TEST AND CONSTRUCTION a) Report of
dead-load pile test. b) Report of dynamic test (Including low
strain and high strain dynamic tests); c) Abnormal phenomena and
treatments and results during construction;
(Last page of Piling Test Specification)