MS 006 01 r1 not approved

G ENERALThis method statement describes the procedures for delivery, storageand driving of precast Reinforced Concrete Spun pile, purchased from anapproved Supplier, for the Conveyance S

Where this page is over-stamped with the words “Controlled Copy” this means:

a) Distribution is centralized - in this case of this document from the Site Manager;

b) Each copy is issued to a particular person or organization If the

document is no longer required it should be returned to the relevant person;

c) It is not to be photocopied either in whole or in part Additional copies are available on request;

d) Copy holders will be automatically issued with any amendments

Responsibility for incorporating such amendments rests with the copy holder.

1 4 / 12 / 06

2 I NSPECTION AND T EST P LAN

3 I NSPECTION C HECKLIST ( S ) / F ORM ( S )

4 S AFETY R ISK A SSESSMENT

5 E NVIRONMENTAL R ISK A SSESSMENT

6 P ILE D RIVING S EQUENCE D RAWINGS

7 L OCATION M AP FOR S TATIC L OAD AND H AMMER D RIVING

1 G ENERAL

This method statement describes the procedures for delivery, storageand driving of precast Reinforced Concrete Spun pile, purchased from anapproved Supplier, for the Conveyance Sewer from accumulateddistance of St 1+081.55 to Sta 3+144.30

1.1 Purpose (based on the alternative proposal)

The purposes of this document are as noted hereunder:

a) ensure that the precast reinforced concrete piles delivered tothe Site are in accordance with the approved requirementsb) ensure that the piles are driven to the specified penetration, inthe correct position(s) as shown on the approved drawings, inaccordance with the requirements of Section 5.2 of theSpecification

c) ensure that the precast reinforced concrete piling worksconform to the approved Management System and QualityControl Plan

b) Contract Documents, Specifications: Technical SpecificationSection 5.4 “Measurement and Payment”;

1.3 Referred Drawings

The following drawings are applicable to the contents of thisdocument:

a) Contractor’s Drawing No CO-P-401

b) Contractor’s Drawings No.’s CO-P-402 to CO-P-419 (inclusive)detailing the R.C Pile Location plan

This scope of works detailed hereinafter covers the steps to be takenwhen preparing the Site area, setting out the pile location, driving thepiles to the required elevation in the position(s) shown on the approveddrawings

Table 2.1 hereinafter on page 4 outlines the estimated quantities ofworks associated with the Reinforced Concrete Piling Works:

Table 2.1 Estimated Quantities of Works

The length calculated for pile driving shall be measured from the surfacelevel from which the pile is driven, as approved by the Engineer, to thepile tip in accordance with Section 5 of Division B of Volume 2 of theContract “Specifications”

3 M ETHODOLOGY

Two methods of driving will be utilised in the Piling Works; i) DieselHammer as stated in the Specification, and ii) Static Load as required bythe Department of Construction (DOC) To avoid any disturbance and

damage to residential and building structures located close to the pilinglocation static load will be implemented For other areas whereneighbouring structures are located further away from the piling location

or where no neighbouring structures exist, diesel hammer will be used.The specific locations where static load and diesel hammer will be

carried out are shown in the Location Map contained within Appendix

No 7 hereto.

3.1 Flowchart

The flowchart detailed hereinafter on page 5 shows the sequence ofworks for the reinforced concrete piling works associated with theProject:

Driving (bottom segment)

Delivery, checking and storage

Setting out and checking conveyance sewer centreline, pile centre and pile position in accordance with the approved drawings

Driving

OK Sheet Piling

Trench excavation

Pile head treatment

Temporary sheet piling and trench excavation will be described in Method Statement MS-008 Conveyance Sewer Construction

The Engineer shall check the desired bearing capacity and issue

appropriate instructions in accordance with Sub-Clause 5.2.3.2 (d) of the Technical Specification

Piles shall be driven to the penetration specified (or the elevation shown on the approved drawings), in line and position with leader, where appropriate, in accordance with Sub- Clause 5.2.3.2 (c) of the Technical Specification

Concrete will be cut off at the required level and the pile will be connected to the bottom slab of the conveyance sewer by providing additional reinforcement embedded in concrete

Check bearing capacity

E AST - W EST H IGHWAY A ND W ATER E NVIRONMENT P ROJECT M ANAGEMENT U NIT O F H O C HI M INH C ITY

H O C HI M INH C ITY W ATER E NVIRONMENT I MPROVEMENT P ROJECT

P ACKAGE D - C ONVEYANCE S EWER C ONSTRUCTION A ND E XISTING C OMBINED S EWER I MPROVEMENT

S HIMIZU C ORPORATION MS-006 R EINFORCED C ONCRETE P ILING W ORKS

3.2 Delivery and Storage

The piles will be fabricated in accordance with the latestContractor’s Drawing No CO-P-401 by an approved supplier

The maximum allowable length of the piles is limited 15 metres,hence, the piles shall be divided into two segments The length ofthe segments for each required pile length is shown hereunder inTable 3.2

Table 3.2 Segment Lengths

plug Reference is made to Article 3.10

Sub-SLING CONNECTED

TO CRANE

Figure 3.1

Piles shall not be laid directly on the ground but shall be supported

by timber blocks spaced at such dimensions that the flexure stressimposed on the piles during storage will be minimised

3.3 Hammer Capacity

The hammer type / capacity shall be selected in accordance withthe provisions of the Technical Specification The energy of thehammer shall numerically be approximately one half of the weight

of the pile plus 4,000kg Based on the Technical Specification thecalculated result of the hammer capacity is as shown in Table 3.3hereunder:

Table 3.3 Summary of Calculation according to the

3.4 Pile Driving Sequence and Pile Code

Pile driving works will commence at Station 1+525.30

Two piling teams will be mobilised, one working in a Southerlydirection from the aforementioned station reference while thesecond team will be working in a northerly direction

The construction of the conveyance sewer is divided into segments.Each segment will be assigned a unique reference number based onthe direction of construction All segments South of theaforementioned station will be given the prefix “S” while Northernsegments will be given the prefix “N”

As an example segment S3 indicates the third segment in aSoutherly direction from Station 1+525.30

All reinforced concrete piles shall be assigned a unique numberalong the same principles as that described above All piles with

even numbers are those located at the East side of any givensegment while odd numbers indicate piles located on the West side

of any given segment Figure 3.2 on page 8 illustrates the planned

pile code referencing while Appendix No 6 hereto gives a pictorial

representation of the driving sequence

3.5 Setting-Out

The pile centre point shall be set out using a suitable calibratedsurvey instrument The survey data will be recorded in writingusing the “RC PILE SURVEY RECORD” format contained within

Appendix No 3 hereto attached.

3.6 Preparation for Driving

3.6.1 Material Quantity Check

STARTING POINT

DIRECTION OF PILING TEAM 2 DIRECTION OF PILING TEAM 1 CONSTRUCTION JOINT

E N

F IGURE 3.2

All pile segments delivered to Site shall be visually inspectedfor cracks or other similar defects prior to being driven All pilesegments shall be marked at 1 m intervals throughout theirentire length

3.6.2 Equipment Check

Before commencing pile driving leads shall be constructed so

as to allow freedom of movement of the hammer Leads shall

be securely held in position to ensure rigid lateral support tothe pile during driving Caps shall be prepared and shall befurnished with a suitable cushion next to the pile head Thecap and cushion are shown in Figure 3.3 hereinbelow

Figure 3.3

3.6.3 Check of Setting-Out

Before driving the centreline, pile positions and stations will beset-out by the Contractor from the established temporarybenchmarks Any temporary benchmarks within the vicinity ofthe pie driving works shall be maintained in a safe andundisturbed condition

3.7 Pile Driving

3.7.1 Pitching and Driving by Diesel Hammer

The pile shall be pitched accurately at the correct location.Driving shall be continuous and the numbers of blows for eachmetre of penetration of the pile shall be constantly recorded.3.7.2 Pitching and Driving by Static Load

Pile and pressing machines shall be set out at the correctlocation and adjust the verticality and balance of the machine.Once the machine has been suitably adjusted then thecounterweight is placed The first segment of the pile is thenpitched within the pressing machine by Mobile crane andadjusted to ensure the correct verticality and location Atypical illustration of the pile pressing machine is shown inFigure 3.4 hereinbelow.

Figure 3.4

Start pressing the first segment The pressing will temporarily

be stopped when the head of the first pile segment isapproximately 0.8m above the ground level This is done topermit the connection of the second segment to the first one

by welding Pile connection shall conform to the Contractor’sDrawing CO-P-401 Once the joint is completed pressing iscontinued until the pile reaches the specified level

Pile driving shall be continuously recorded using the “RC PILEDRIVING BY STATIC LOAD RECORD” form included within

Appendix No 3 hereto.

The pressing will be stopped when the required pile level isattained or the pressing load as specified in the ConstructionDrawing is achieved

3.7.3 Monitoring of pile verticality

The verticality of the pile will be checked by two plumbs Theplumbs shall be carefully set in locations which will not beaffected by vibration from the driving process but which also

H-Beam Concrete Block Pressing machine Concrete pile

afford an adequate view of the pile being driven Assuming thepile being driven is the origin the plumbs will be set-up at anangle of 90º, thus ensuring that the verticality of the pile ischecked in all directions Figure 3.5 herein below illustrates theintended method.

3.8 Bearing Capacity Check

Piles shall be driven such that they exhibit a bearing capacity of notless than that shown on the Construction Drawings The Engineershall specify the penetration and the Contractor shall drive the pile

to the penetration specified

To check the developed bearing capacity of the pile, Hiley’s formulawill be utilised

following TVCN 88: 1982)Value of C1 is usually smaller compared with C2.

R = Rebound Value (C2 + C3)

Ef = Penetration Value

K = 0.75 ~ 0.85 Varies

W = Weight of HammerW(P) = Weight of Pile

H = Drop Height3.9 Temporary Sheet Piling and Trench Excavation

For details of temporary sheet piling, any temporary protection workand trench excavation works reference is made to MethodStatement MS-008-01 which will be submitted under separate cover

by the Contractor

3.10 Pile Head Treatment

Pile head treatment works will be commenced after completion oftrench excavation works are completed for the area in question.The top of the spun pile shall be cut-off as indicated on theapproved drawings unless otherwise instructed by the Engineer.The piles will be connected to the base slab of the conveyancesewer by providing a round steel plate with five (05) number Ø14mm AII type reinforcement bars welded perpendicularly and

spaced evenly along the perimeter of the plate The plate will beplaced inside the hollow centre of the pile and suspended 600mmbelow the pile head by tying the reinforcement bars toreinforcement bars of the base slab of the conveyance sewer Whenthe base slab of the conveyance sewer is concreted, concrete willalso fill the upper portion of the centre of the spun pile The steelplate will act as formwork to prevent the whole of centre of the spunpile from being filled with concrete Figure 3.6 hereinbelow provide

a pictorial presentation of the aforementioned detail:

Figure 3.6

4 S CHEDULE

The schedule for the precast reinforced concrete piling works is included

within Appendix No 1 hereto.

Spun Pile Supplier

The relevant supplier shall be informed by the Contractor underseparate cover

Pile Driving Sub-Contractor

Name: The Hung Construction Co., Ltd

Address: 61 Cao Thang Street, District 3, HCMC

Pile Driving Sub-Contractor

Spun Pile

Supplier

Tel No.: (848) 834 2255 / 6 / 7 / 8

Fax No.: (848) 834 2259

Contact: Mr M H Anh, Technical Planning Manager

Reference is made to the Contractor’s letter PMU-0064 dated 11October 2006 for information pertaining to this Sub-Contractor

5.3 List of Machinery / Equipment

Equipment / Machinery

Capacity (Detail)

(Sumitomo LS-118)

50 ton (Weight of hammer: 10.5

ton) (Blow per min: 39 to 60

blow/min) (Max energy: 13.5 ton･m)

(Hitachi PD-90)

50 ton (Weight of hammer: 10.5

ton) (Blow per min: 39 to 60

blow/min) (Max energy: 13.5 ton･m)

(Hitachi KH150 + RIG)

No Type of

Equipment / Machinery

Capacity (Detail)

(1,000 x 600 x 3,000)

From the above equipment two (02) piling teams will be mobilised

to the site, each team consisting of a piling rig, service crane, dieselhammer and generator

6 Q UALITY C ONTROL

All works associated with the Concrete Works shall comply with therequirements of the Management System and Quality Control Plan, asmay be amended from time to time

6.1 Preparatory Works

6.1.1 Survey

Survey works shall be executed to define the pile coordinatecentre point based on the approved drawings The existingground level for the area in question will also be checked andconfirmed Data will be recorded on the “RC PILE SURVEYRECORD” form

6.1.2 Material Quality Check

The fabrication of the piles shall be carefully controlled inaccordance with the Inspection and Test Plan contained within

Appendix No 2 hereto and further elaborated in the

information submitted to the Engineer under cover of letterENG-0090 dated 9 October 2006 After delivery to Site thepiles shall be checked for cracks, defects and similar surfaceirregularities Pile shall be marked along their full length at 1mintervals

6.1.3 Equipment Quality Check

An internal inspection of the diesel hammers, cranes andaccessories shall be conducted together with the Sub-Contractor to check the working condition, quantity, capacity,safety condition before commencing In addition periodicinspections will be carried out

6.2 Driving Works

6.2.1 Position and Driving

Piles shall be checked for their correct position prior tocommencing driving During driving piles shall be forverticality by plumb(s)

Driving shall be continuous and the numbers of blows for eachmetre of penetration of the pile shall be constantly recorded.Pile driving shall be continuously recorded utilising the “RC PILEDRIVING RECORD” form.

6.2.2 Verticality

As outlined previously the verticality of the piles will bechecked by plumb(s) during driving After pile driving andtrench excavation works are complete the coordinates of thepile centre will be determined and compared to the coordinates

of the pile at the driving level All equipment for executingsuch checking shall be calibrated

6.2.3 Pile Connection

Pile segments shall be connected by welding The weldingquality and length will be closely supervised and executed inaccordance with the approved drawings

6.2.4 Depth

Measuring of the driving depth shall be by means of the levelsmarked on the pile Data will be recorded on the “RC PILEDRIVING RECORD” form

6.3 Final Driving

Piles will be driven to the required tip elevation The target pile tipelevation and penetration are the criteria for ceasing of pile drivingoperations for any given pile Usually the penetration is lees than orequivalent to the specified penetration rate, based on theEngineer’s instructions

In the event one of the circumstances hereunder occurs duringdriving we shall immediately inform the Engineer to await hisfurther instructions:

• Actual refusal is shallower or deeper than specified tipelevation

• Pile head is broken or other damage appears on the pileduring driving

• Obstructions are encountered

Appendices No.’s 2 and 3 hereto outline, respectively, the

Inspection and Test Plan applicable to the precast ReinforcedConcrete Piling Works and the Inspection Checklist(s) / Form(s)

Appendix No 2 hereto nominates the inspection steps to be

implemented in order to ensure that the required quality, and

substantiating records, are maintained while Appendix No 3

details the inspection records which are to be completed,maintained and filed on Site

7 S AFETY M ANAGEMENT

All works described herein shall comply with the requirements of theapproved Occupation Health, Safety and Rehabilitation Plan and ProjectSafety Plan

Specific Safety considerations:

a) Working under heavy traffic conditions

Diversion schemes shall be provided in accordance with therequirements of the DTPW office

Proper illumination / lights shall be provided if the works areexecuted at night

Watchmen and traffic controllers (if required) shall wear reflectiveclothing

b) All workers shall wear appropriate PPE, i.e helmet, shoes, glovesetc as appropriate and deemed necessary in accordance with thePPE matrix contained within the Project Safety Plan

c) First aid facilities shall be available

Appendix No 4 hereto includes the completed Safety Risk Assessment

for the precast reinforced concrete piling works

8 E NVIRONMENTAL M ANAGEMENT

All works described herein shall comply with the requirements of theapproved Environmental Management Plan

Specific Environmental considerations:

a) Good housekeeping practices shall be implemented i.e.management of waste and the like

Environmental monitoring shall be carried out during the pile drivingworks as detailed hereunder:

a) Visual observations for particular pollution shall be carried out byauthorised representatives of the Contractor’s staff

b) Noise monitoring shall be carried out on a daily basis by theContractor within the vicinity of the Site in particular close toneighbourhood houses A suitable noise measuring device shall beutilised

In addition to the above periodic environmental monitoring by the expertfirm, for noise, vibration and air pollutants will be carried out

Appendix No 5 hereto includes the completed Environmental Risk

Assessment for the Reinforced Concrete Piling Works

9 R EVISION R ECORD

On pages 19 and 20 hereinafter a narrative description of revisions tothe original Reinforced Concrete Piling Works Method Statement isincluded

MS-006 Reinforced Concrete Piling Works Revision No 1 - List of Changes / Incorporations

Contractor is requested to submit the Method Statement once the approval of using spun pile has been received

The Contractor is anticipating receiving approval for the use of spun pile upon the Employer’s approval of the Conveyance Sewer Alternative

The details of your proposed method of Capping shall be described, in accordance with the Specification Sub-Clause 5.2.3.1

The details relating to our capping method, together with sketch, have been added to Sub-Clause 3.6.2 accordingly

Full details of the Pile Driving Equipments shall be described, in accordance with the Specification Sub-Clause 5.2.3.2

Full details for the pile driving machines have been added to the table in Sub-Clause 5.3 accordingly

Item No Description Changes / incorporations made

Please add the clause as follows 3.7.2Monitoring of Pile Verticality 3.7.3Segment Connection

The clauses have been added accordingly into the text although the numbering system has been changed resulting from the inclusion of static load driving method (refer to item below)

and the requirements from the Department of Construction received in the Meeting held on 27 October 2006 the method for pile driving by static load had been included within this revised Method Statement

A PPENDIX N O 1

S CHEDULE