PCA Plans · OPW16/0021

GENERAL NOTES

1, THESE DRAWINGS ARE TO BE READ IN CONJUCTION WITH TOD
CONSULTING ENGINEERS DRAWINGS. THESE DRAWINGS
DOCUMENT AN ALTERNATE SOLUTION FOR THE RETENTION AND
PILED FOUNDATION SYSTEMS. IF ANY DISCREPANCIES ARISE,

CONTACT THIS OFFICE FOR CLARIFICATION.
2. ANY SPECIFIC NOTES TAKE PRECEDENCE OVER THESE GENERAL

NOTES 2,

UNO, ALL DIMENSIONS ARE IN MILLIMETRES

WORK TO WRITTEN DIMENSION ONLY, DO NOT SCALE
WORKMANSHIP AND MATERIALS SHALL BE IN ACCORDANCE WITH
THE RELEVANT AUSTRALIAN STANDARDS .

WHERE PROPRIETARY PRODUCTS ARE SPECIFIED, THEY ARE TO BE
USED AND INSTALLED IN ACCORDANCE WITH THE
MANUFACTURERS GUIDELINES AND SPECIFICATIONS.

7. WHERE PROPRIETARY PRODUCTS ARE SPECIFIED, ANY PROPOSED
SUBSTITUTION MUST BE SUBMITTED TO PCA FOR APPROVAL.

SAFE WORK PRACTICES

1, THE CLIENT IS RESPONSIBLE FOR OBTAINING ALL NECESSARY
PERMITS AND APPROVALS PRIOR TO COMMENCING
CONSTRUCTION.

2. THE CLIENT IS RESPONSIBLE FOR LOCATING ALL BURIED SERVICES

3. WHERE APPLICABLE, ANY SUBCONTRACTOR TO PCA IS
RESPONSIBLE FOR THE DESIGN, PROVISION AND CERTIFICATION OF
ANY TEMPORARY WORKS REQUIRED.

4, ALLEXCAVATIONS SHALL BE PROTECTED AS APPROPRIATE
5. THE CLIENT IS RESPONSIBLE FOR ESTABLISHING AND MONITORING

SURVEY POINTS ACROSS THE SITE AND ADJACENT PROPERTIES

PRIOR TO AND DURING CONSTRUCTION. 6.
SET OUT
1. PILE SET OUT IS BY OTHERS he
2. DIMENSIONS SHOWN ON PILE LAYOUTS ARE PLAN DIMENSIONS

AND ANY LONGITUDINAL GRADE IS TO BE TAKEN INTO ACCOUNT

IN THE SET OUT.
REINFORCEMENT FOR CONCRETE WORKS

8.

iL REINFORCING STEEL SHALL BE IN ACCORDANCE WITH AS/NZS 4671

N= GRADE DSOON DEFORMED BARS
R= GRADE R2S50N ROUND PLAIN BARS
Sl= GRADE DSO0L WLEDED MESH

MINIMUM BENDS, DEVELOPMENT/ SPLICE LENGTHS, HOOKS AND
COG DIMENSIONS TO AS3600-2009

DESIGN LIFE

1

THE STRUCTURE HAS BEEN DESIGNED FOR A 50 YEAR DESIGN LIFE

DESIGN PARAMETERS- RETENTION

15

G

THE FOLLOWING NOTES DOCUMENT THE DESIGN OF THE PERMANENT
RETENTION SYSTEM
THE SYSTEM CONSISTS OF 4 PRIMARY COMPONENTS:-

1 VERTICAL CIRCULAR HOLLOW SECTION (GRADE 350) WITH

CENTRAL HOLLOWBAR MICROPILE

2 RAKED (30° OFF VERTICAL) HOLLOWBAR MICROPILE ANCHORS

3 REINFORCED CONCRETE CAPPING BEAM

4 _ INTERMEDIATE GROUT COLUMNS
THE SYSTEM HAS BEEN MODELLED USING THE COMMERCIALLY AVAILABLE
"WALLAP' SOFTWARE AS A PROPPED CANTILEVER, USING THE BURLAND
POTTS METHOD AND ACTIVE SOIL PRESSURES.
WITH RESPECT TO TOE EMBEDMENT, THE TARGET FACTOR OF SAFETY FOR
OVERALL STABILITY, EQUALS 1.5, THE PILE TOE IS TYPICALLY SET AT THE
UNDERSIDE OF THE CHS, DUE TO THE RELATIVE STIFFNESS OF THE CASING
TO THE CENTRAL HOLLOWBAR. THE CENTRAL HOLLOWBAR IS FOUNDED AT
DEPTH TO RESIST THE VERTICAL AXIAL LOADS.
DESIGN SOIL PRESSURE COEFFICIENTS HAVE BEEN DETERMINED BY BACK
CALCULATION OF Ko AND Ka VALUES PROVIDED IN MORRISONS
GEOTECHNCAIL REPORT DATED 14/10/2014 SECTION 3.2.
IN PARTICULAR, TO DETERMINE THE DESIGN INTERNAL FRICTION ANGLE ()
FOR THE LOOSE SANDS, REFERENCE IS MADE TO THE PUBLISHED VALUES OF
Ko= 0.5 AND KA= 0.31
USING RANKINES THEORY OF EARTH PRESSURE:-
Ko= (1-SIN $)= 0.5 WHEN $=30° AND
Ka= (1-SIN 6) / (1+SIN $)=0.31 WHEN $=32°,
HENCE DESIGN INTERNAL FRICTION ANGLE FOR LOOSE SAND $= 31°
THE TYPICAL DESIGN SOIL PROFILE IS AS FOLLOWS:-

DEPTH TYPE youd Ko 38/h Ka Kp
0-4.5m  LOOSEDUNESAND 17 31 0,49 0.67 0.27 4.95
4.5-10m MEDIUM DENSE 19 33 0.46 0.67 0.25 5.66
10om+ DENSE SAND 19.5 38 0.38 0.67 0.20 8.2

A SURCHARGE LOAD OF 10kPa HAS BEEN APPLIED TO THE TOP
(BOUNDARY) WALL, TO ACCOUNT FOR NEIGHBOURING STRUCTURES IN
ACCORDANCE WITH SECTION 4.3 OF TOD CONSULTING ENGINEERS
‘STRUCTURAL DESIGN CONCEPT’ REPORT DATED 29/7/2014 AND SECTION
3.2 OF THE GEOTECHNICAL REPORT PREPARED BY MORRISON GEOTECHNIC
DATED 14/10/2014.

A SURCHARGE LOAD OF 20kPa HAS BEEN APPLIED TO THE REMAINING
WALLS TO ACCOUNT FOR CONSTRUCTION TRAFFIC, EXCEPT FOR THE AREAS
NOTED AS CRANE WORKING AREAS. N.B. MAXIMUM CRANE SIZES AND
WORKING AREAS NOT TO EXCEED THE LIMITS AS NOTED ON DRAWING.

(FINAL DESIGN OF RETAINING WALL IN THESE WORKING ZONES

MICROPILE SPECIFICATION

1. MICROPILES ARE TO BE 40/20 HOLLOW BARS, 90 dia DRILL BITS,
COUPLERS AND CENTRALISERS INSTALLED IN) ACCORDANCE WITH
PCA-QF-059 MICROPILE INSTALLATION METHOD STATEMENT.
FINAL FLUSH GROUT MIX TO BE 0.45W/C RATIO, WITH A:-

MINIMUM COMPRESSIVE STRENGTH OF 32MPA AFTER 28 DAYS
TARGET SPECIFIC GRAVITY OF 1.89 (+/-0.06)

3. MICROPILE INSTALLATION TOLERANCE:-
NOMINALLY +/- 75MM PLAN
AND +/- 1° FROM VERTICAL/ RAKE ANGLE.
4. BAROID MUD BALANCE TESTS WILL BE CARRIED OUT AT REGULAR

(TWICE DAILY) INTERVALS,

A MINIMUM OF 1% OF THE FOUNDATION MICROPILES ARE TO BE
STATICALLY LOAD TESTED (TENSION) IN ACCORDANCE WITH
AS2159-2009- UP TO THEIR SERVICEABILITY (Ps) LOAD AS NOTED ON
THESE DRAWINGS.

GROUT COLUMNS
INITIAL SITE TESTING WILL BE CARRIED OUT PRIOR TO FINAL

INSTALLATION TO OPTIMISE THE GROUT MIX/ INSTALLATION
METHOD.

2. INITIAL TRIALS WILL ADOPT A 1:1 WATER/ CEMENT RATIO GROUT
MIX, HOWEVER THE FINAL MIX DESIGN AND INSTALLATION
METHOD IS TO BE DETERMINED FROM PRE- PRODUCTION TRIALS

SHOTCRETE

1. ALL SHOTCRETE AND WORKMANSHIP TO AS3600
2. UNO, TYPICALLY 75 THK, SL72 MESH CENTRAL, 32MPa

FIBRECRETE

1. PROVIDE FIBRE CRETE SPRAY TO NOTED RETAINING WALL FACES
2. TBA

EXCAVATION

THE EARTHWORKS CONTRACTOR IS TO ENSURE THAT ALL DUE CARE
IS TAKEN WHEN EXCAVATING ADJACENT TO THE MICROPILED WALL
SO THAT THE CHS/ INTERMEDIATE GROUT COLUMNS ARE NOT
DAMAGED DURING EXCAVATION.

MAX EXCAVATION LEVELS ARE AS NOTED ON THE DRAWINGS

G)

~ SAFETY IN DESIGN- MAINTENACE

1 IT IS THE RESPONSIBILITY OF THE CLIENT TO:

A. MAINTAIN ALL DRAINAGE SUCH THAT WATER IS DIRECTED AWAY
FROM THE RETAINING WALLS

B. CARRY OUT MONITORING PROGRAM AS BELOW

RETAINING WALL MONITORING (CONSTRUCTION PHASE)

1, TOP WALL- UPON COMPLETION OF CONSTRUCTION OF THE CAPPING
BEAM, AND PRIOR TO EXCAVATION, SURVEY PINS ARE TO BE
INSTALLED AT 25m INTERVALS TO THE SIDE FACE OF THE CAPPING
BEAM AND BASELINE MEASUREMENTS TAKEN.

TRIGGER LEVELS FOR MONITORING ARE AS FOLLOWS:-

i LATERAL MOVEMENT RED
(AS A % OF DESIGN DEFL'N

RECORDED AT SURVEY PINS

ALARM YELLOW

50% 715% 100%

3. RESPONSES TO TRIGGER LEVELS:-

ALARM- — INCREASE MONITORING FREQUENCY (ESPECIALLY
DURING WET SEASON) AND NOTIFY DESIGNER
YELLOW- — PLAN MITIGATION WORKS REASSESS WALL AT
LOCATION OF MOVEMENT AND REVISE TRIGGER
LEVELS AS APPROPRIATE
RED- IMPLEMENT PLANNED MOVEMENT MITIGATION
WORKS, SUBJECT TO REASSESSMENT OF TRIGGER
LEVELS
4. FREQUENCY OF MONITORING
A. DURING CONSTRUCTION STAGE:-
WEEKLY UNTIL PRACTICAL COMPLETION
(OR FOLLOWING SIGNIFICANT WEATHER EVENT)*
B. POST CONSTRUCTION:-
MONTHLY FOR 12 MONTHS AFTER PCA PRACTICAL COMPLETION;
YEARLY THEREAFTER

(OR FOLLOWING SIGNIFICANT WEATHER EVENT)*

*- DEFINED AsGsmnRAnrats IN 24 HOURS OR LESS AND/ OR
SUSTAINED RAINFALL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. ALLREINFORCEMENT TO BE ACRS CERTIFIED PENDING)
3. EXPOSURE CLASSIFICATION: B2
4. COVER TO REINFORCEMENT SHALL BE:-
BOTTOM 60 (CAST AGAINST GROUND) 9. NOTING SECTION 5.0 OF THE GEOTECHNICAL REPORT, NO GROUNDWATER
TOP/ SIDES 50 (FORMED) HAS BEEN INCLUDED IN THE DESIGN. THE MICROPILE WALLS ARE ‘WET’
5. MIN LAP LENGTHS (UNO) WALLS. THE DESIGN ASSUMES A FREE DRAINING RETAINED MATERIAL, AND
BAR 12 16 20 24 28 32 THE INSTALLATION OF DRAINAGE TO ALLEVIATE HYDROSTATIC PRESSURE.
LAP 300 400 500 600 700 850
MIN LAP LENGTHS (TOP/ SIDE BARS)
BAR 12 16 20 24 28 32
LAP 375 500 625 750 950 1050 DESIGN PARAMETERS- FOUNDATION PILES
6. WHERE NOMINATED, REINFORCEMENT/ DOWELS TO BE HOT
DIPPED GALVANISED TO AS/NZS 4680 1, THE FOUNDATION MICROPILES HAVE BEEN DESIGNED TO RESIST THE LOADS
NOMINATED ON TOD CONSULTING ENGINEERS DRAWINGS JOB no. 14517,
DRG no's:-
REINFORCED CONCRETE OP22 B, OP25 B, OP29 B, OP30 B, S1 B, S2 B, S4.B, S10 B
1, ALL CONCRETE AND WORKMANSHIP TO AS3600
2. CAPPING BEAM CONCRETE TO BE N40/20
3. BLINDING CONCRETE TO BE N25/20
4.  ALLEXPOSED EDGES TO HAVE 25 CHAMFER UNO.
5. CONCRETE COMPRESSIVE STRENGTH TESTS TO BE CARRIED OUT IN
ACCORDANCE WITH AS 1012.
CLIENT: DESIGNED: KW PROJECT:- TITLE- NOTES
HUTCHINSON DRAWN: KW 71 SEAVIEW TERRACE
BUILDERS caeckeo= __AlH SUNSHINE BEACH
SIGNED:- Le DRAWING NUMBER:- 10890- P100 A
A_|_ASNOTED 5/08/2016 MM GROUND ENGINEERING, meee ud STATUS:
= mfp DATE: }2 ok CO-ORDINATION

 

 

 

 

 

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