Method Statement of Foundation

Excavation foundation Lean concrete Pile head treatment Installation of form work Formwork fabrication Casting concrete Curing concrete Back filling... - Casting lean concrete + Completi

Prepared by Lương Văn Lượngng Văn Lượngng Deputy Site Manager

Reviewed by Ph m Vũ Namạm Vũ Nam Site Manager

Approved by Nguy n Vănễn Văn

METHOD STATEMENT

FOR

RC FOOTINGS

Contents

1 INTRODUCTION 4

1.1 PURPOSE 4

1.2 DEFINITIONS: 4

2 BUILDING DESCRIPTION: 5

3 ORGANIZATION CHART 8

3.1 Organization Chart 8

3.2 Assignment 9

4 FLOW CHART AND DIRECTION OF WORK 10

5 SCHEDULE 11

6 SPECIFIC STANDARD 11

7 TOOL & EQUIPMENT 12

8 MATERIALS 12

9 MATERIALS HANDLING, STORAGE AND DELIVERY 13

10 PREPARATION WORKS 13

11 CONSTRUCTION METHOD 15

11.1 Excavation foundation 15

11.4 Installation of Form work 19

11.5 Steel works 20

11.6 Concrete work 21

11.7 Back filling 22

12 QUALITY CONTROL 22

13 SAFETY PLAN 24

14 APENDIX 25

1 INTRODUCTION

1.1 PURPOSE

The purpose of this Method Statement is to set the policy for construction procedures and qualityaccording to Contract Specifications To outline the work instruction by which RC Footings is carriedout

1.2 DEFINITIONS:

PROJECT PARTICULARS:

Project name : SMC MANUFACTURING (VIET NAM) FACTORY-PHASE 1 PROJECT

Address : Long Duc Industrial Park, Long Duc Ward, Long Thanh District, Dong Nai Province,

Viet Nam

PARTY:

Client/ Owner : SMC MANUFACTURING VIETNAM CO., LTD

Contractor : KAJIMA OVERSEAS ASEA PTE LTD

Responsible for the supervision of Contractors who will construct the podium and all related activities as outlined in this procedure

SCOPE OF WORK

The works to be carried out by Sub-Contractor (ACSC) and shall apply for works at Factory No.1 of SMC

MANUFACTURING (VIET NAM) FACTORY- PHASE 1 PROJECT

1 Construction Reinforcement Concrete Structure works included:

a Pile head treatment

2 BUILDING DESCRIPTION:

Location:

Factory No.1 are located at the corner of Road No.D5 &N2-5 in Long Duc Industrial park as below

Description:

- Building purpose : Factory

- Foundation : Spun piles (D300, 350, 400 mm)

- Structure :RC structures + steel rafter; Slab on grade

GROUND FLOOR PLAN

Thay mat catnay bang ban

ve moi

- Slab thickness:

o Factory Ground floor slab : 300 mm thk

o Storage/Utilities Ground Floor slab : 150 mm thk

Deputy Site Manager 1

NGUYỄN HOÀNG TRINH (MP:090 291 1235)

nghoangtrinh@acsc.com.vn

Deputy Site Manager 2

LƯƠNG VĂN LƯỢNG (MP: 093 734 3055)

Thái Doãn Long (MP:097 799 7711)

Hoàng Văn Hải (MP:908 818 1059)

Safety Supervisors

Phạm Văn Mạnh (MP:097 235 2459)

Nguyễn Văn Triểu (MP:093 996 0180)

Construction teams

3.2 Assignment

NGUYỄN MINH TUẤN

TRẦN AN TOÀNTRƯƠNG THANH VIỆT

4 FLOW CHART AND DIRECTION OF WORK

The work sequence of construction the RC footings is shown at the following flow chart

Excavation foundation

Lean concrete

Pile head treatment

Installation of form work Formwork fabrication

Casting concrete

Curing concrete

Back filling

5 SCHEDULE

Construction Schedule of Footings is attached in Appendix-2

6 SPECIFIC STANDARD

Reinforced Concrete Footings shall be carried out in accordance with the requirements of:

- SMC MANUFACTURING (VIET NAM) FACTORY-PHASE 1 PROJECT Specification for Footing works

- Current Vietnamese Construction Standards

+ TCVN 4447-2012 Vietnamese standard 4447-2012 (Earth works - construction, check and acceptance)

+ TCVN 5593 : 1991 Vietnamese standard 5593-1991 (Building engineering work - Permissible tolerances in geometry)

+ TCVN 1651-2008 Vietnamese standard 1651-2008 ( Steel for the reinforcement concrete, part1+2)

+ TCVN 4453 – 1995 Vietnamese standard 4453-1995 (Concrete structures- codes for

construction, check and acceptance)

+ TCXDVN 371 - 2006 Vietnamese standard 371-2006 (Acceptance of constructional quality of

building works)

- Related Materials approved by KAJIMA & Owner

7 TOOL & EQUIPMENT

The equipment to be used for the construction of Footings is listed below

Submersible Pump 4 inches, H=24m

Straightening

machine

Nos 1 Use for reinforcing steel work

Diameter <8mm

Screwdriver /Drilling

machine

Nos 14 Manufacturing formwork

8 MATERIALS

b/ Steel rebar: (supplied by KOA)

- With Diameter < 10mm: SR295

- With Diameter >10mm : SD390, B15-B35

c/ Form work:

- Plywood, 18mm thk reinforced with steel box 5x5 (cm), 4x8 (cm)

9 MATERIALS HANDLING, STORAGE AND DELIVERY

- Concrete : Ready- mixed concrete are transported from batching plant to site in concrete truck (6

to 12 m3 capacity) The concrete must be delivered to site within maximum 60 minutes depend

on the mix design of concrete supplier

- Formwork : Formwork will be pre-fabricated then stocked on yard with protection of plastic cover Before installing, the formwork will be transported to site and placed near the excavation

- Steel rebar : Steel bars are stored on the steel platform or concrete blocks to prevent the contact

of steel rebar with the ground All steel rebar are stocked in the steel yard with roofing and cover with plastic sheet to protect them with rain water

- Other materials are keeping in storage and they are transported to the site work when they are

in used

10.PREPARATION WORKS

- Excavation foundation

+ Receiving the construction area transited by KOA

+ Receiving the coordinate, benchmark system from main Contractor (KOA)

+ Clearing the ground and remove any obstruction on the ground

+ Set up drainage system for rainwater and underground water inside and outside pit

+ Prepare internal road from the excavation to the stock yard of surplus soil

+ Setting out excavations with their center lines, dimension and marking on the ground

+ Manufacturing the steel plate of pile cap starter bars.

+ Marking the cutting level of the piles

+ Preparing and check the cutting machine

- Casting lean concrete

+ Completing the excavation above design level about 100mm high

+ Drainage and pump water regularly, keep the pit dry

+ Trimming the surplus soil by hand to the design elevation

+ Compacting the base of foundation and testing, if required

- Installation of form work

+ Completing lean concrete

+ Setting out and marking the gridlines and dimensions of footings on lean concrete surface.+ Pre-fabricate formwork

+ Cleaning and applying release agent on formwork surface, if required

- Installation of rebar

+ Shape and dimension of rebar

+ Machine for fabricate rebar

+ Obtaining the approved Shop drawings

- Casting concrete

+ Inspecting of rebar and formwork (record, pictures)

+ Prepare internal road for delivery concrete

+ Cleaning formwork, lean concrete's surface, pump water out of pit

+ Check finishing level of concrete

+ Covered starter rebar by PVC sheet before casting

+ Prepare bucket or slide for casting from top to bottom

+ Order the concrete

11.CONSTRUCTION METHOD

11.1 Excavation foundation

 Step 1: Survey and mark the foundation on the ground

 Step 2: Excavate the soil: Using 2 backhoe machines (0.7 m3) to excavate the soil Factory No.1 is divided into three zones: zone 1 (axis A-E/ 1-6); zone 2 (axis A-E/ 7-11), zone 3 (axis A-E/ 12-15)

BACK HOE MACHINE NO.2

 Step 3: Transportation and disposal surplus soil.

a Stocked soil:

Surplus soil will be transported to the soil reservation location on the site designated by KOA For the back filling process, the soil is gathered as masses which less than 1.5m height and more than 1.5m distance far from the edge of opening hole It is temporary covered by canvas to prevent the dust and used for back fillingprocess later

The volume of soil stocked on construction area (for backfilling) are calculated based on the excavated soil deducted the volume of concrete of footings and stump columns occupied in excavation The volume of excavated soil, volume occupied with concrete and remaining stock soils are shown in table below:

3 F1-F1 A 2.00 46.85

F1 8.00 155.25 F2 8.00 150.96

2 F1A(-1800) 8 3.39

3 F2( -2100) 27 49.14 F2(-2800) 2 3.64

 Volume of compacted soil to be backfilled= 2,377.74 – 253.78 = 2123.95 m3

 Volume of compacted surplus soil to be removed= 253.78 m3

 Volume of ripped surplus soil to be removed= 253.78 x 1.3 = 329.92 m3

 Volume of ripped soil to be backfilled = 2123.95 x 1.3 = 2761.14 m3

where 1.3 is the coefficient of ripping.

The ripped soil to be backfilled will be stocked on construction areas at height 1.5m with quantity and volume

as shown in table:

The location of stocked soil on site as shown in the attached drawing.

The surplus soil will be transported by truck to the stock yard (≈2000 m2) designated by KOA Remaining soil will be leveled at height of 0.5m from existing ground level

b De-watering excavation:

Because of construction in rainy season, a collection pit (WxLxH: 50 x 50 x 50 cm) will be dig in each

ACSC Soil stockarea

11.2 Lean concrete.

 Step 1 : Trimming the soil: This work is carried out by digging to form an even and firm base at the right bottom levels of foundation

 Step 2 : Using the soil compactor to compress the soil to get the level K >= 0.95

 Step 3 : Using steel box 50x100 to manufacture the form work for foundation lean concrete layer

 Step 4 : Casting lean concrete grade B10, stone 1x2

Lean concrete Steel box 50x100 Welding line

11.3 Pile head treatment

 Step 1 : Designated cut-off level should be marked by marker around concrete surface of the pile to keep cutting edge clear and the perimeter of cut-off level marking should be cut in about 20mm depth by small concrete cutter

 Step 2 : Cutting the spun piles at the designed level After cutting, the eccentricity of the pile center should be surveyed and recorded (by others)

The surplus segments of cut plie will be moved out of the excavation by excavator then transported and temporarily stocked in the designated stock yard Later all the remaining

of cut piles will be moved out the site by ACSC

PILE CAP DETAIL

STEEL PLATE Ø170x2mm

REBAR - SD295A

4 Ø12 - L=1000

CONCRETE INSIDE B20

300 60180 60

VIEW "A"

STEEL BAR 2Ø10

 Step 3 : Install the assembly of steel plate and rebar inside the pile head It is temporary hung by the wire fixed to 02 cross rebars on top of pile head Starter rebars are attached

to steel plate by welding

 Step 4 : Casting concrete B20 inside pile head and vibrating concrete

11.4 Formwork calculation:

Formwork of footings are made of plywood 18mm thk and steel boxes

11.5 Installation of Form work

 Step 1: Install the pre-fabricated formwork at the locations and dimensions, which are marked before

 Step 2: Fix the bottom of formwork with steel box, nails

 Step 3: Adjust the formwork to be plumb and straight with steel propping and adjusting jack

Base jack

Round tube steel D49 Steel box 40x80mm

GFL± 0.000

Refer to bottom level of foundation

TYPICAL ELEVATION OF FORM WORK INSTALLATION FOR FOUNDATION

TYPICAL LAYOUT OF FORM WORK INSTALLATION FOR FOUNDATION

Wooden plate thk 18mm Steel box 50x50mm

 Step 1: Cleaning rebar surface

 Step 2: Fabricate the steel rebar by cutting, bending in compliance with approved shop drawings Tagging the steel rebar

 Step 3: Transport the fabricated steel rebar to site

 Step 4: Marking the positions of rebars on lean concrete surface and place the rebars in sequence bottom first and then top Position for lap and lap length as direction

 Step 5: Tie the steel rebars securely with wire in correct positions and distance

 Step 6: Insert spacers under and outside of steel cage to form the concrete cover

TYPICAL LAYOUT OF REBAR INSTALLATION FOR FOUNDATION

 Step 4: Check the finished top level of concrete surface and remove surplus concrete

 Step 5: Finishing the concrete surface with troweling

DRAINAGE HOLE STEEL LADDER

SAFTY BARRICADE

1110 2000

HESSIAN SHEET

11.8 Back filling

+ Marking the elevations of each backfilled layer on footing/stump columns The thickness of each layer is not exceed 0.3m/ layer

+ Backfill the excavation with excavated soil layer by layer

+ Leveling the soil

+ Compacting using rammer to reach the designed compaction ratio K≥ 0.95

+ Repeat the backfill and compaction until reach to the finished level

12.QUALITY CONTROL

With regards to the quality control, all works shall be carried out following the established Project Quality Control Plan Method to treat mistake or defect during constructing:

- Excavation foundation:

+ Locate position of project by survey machine

+ Determine the level of bottom slab by leveling machine

+ Check dimension of pit by tape

+ Tolerance for border, center line, dimension of pit: ± 20cm

- Lean concrete:

+ Check the surface by survey machine, tolerance ±1cm

+ Check rigidity and stability of bracing.

- Installation of rebar

+ Checking material: certificate, check dimension by caliper, take the sample for checking physical-mechanical

+ Check the length, number, position, anchor length, joint by visual and ruler

+ Thickness of protection: checking by tape

+ Tolerance for installation: Spacing among main rebars: 20mm, Stirrups spacing: 10mm.+ Tolerance for protection layer: Foundation: 10mm

+ Tolerance for fabrication: The whole length: 20mm, bending: 20mm

+ Lap length: Rebar SD390 Ribbed bar: 40d (tensile), 15d (compressive)

- Casting concrete

+ Level tolerance on surface: 20mm

+ Horizontal tolerance of section: ± 8mm

- Back filling

+ Inspect each layer after compacting

+ Testing compaction factor as technical requirements and method of owner

13.SAFETY PLAN

With regard to health and safety control, all the works shall be carried out following the established Project Occupational Health and Safety Control Plan (ST-PL-POHSCP)

No Description of job Hazards Hazard events Preventive measures Action by

1 Excavation works +Traffic accident

duringmobilization/demobilization + Accident duringexcavation andtransportationthe soil

+ The soil around

of foundation can

be slide

Injury or death to workers or operators

+ Security standby and control

Mobilization/demobilizationshould not carry out duringheavy traffic jam (morningtime/evening time)

+ Excavator should observeroads speed limits

+ Follow strictly the method

to prevent the landslide

Heavy objects must stand by

at least 1.5m from the edge ofopening excavation

+ Apply the barrier, ribbon &

signboard to prevent theworkers fall down to the pit

+ Excavator driver must haslicense, excavator must beverify certificate and goodactive status

Forman / Supervisor / Worker

2 Pile cap treatment Fall down of

concreteequipmentaccessoriesworker hit bythese fallingobjects

Injury of people/worker

+ Workers must alert whenthey start breaking work

+ Workers wear protectiveequipment

during breaking works

Forman / Supervisor / Worker

3 Form and Re-bar

Installation and

Concreting Works

Fall down of concrete equipment accessories worker hit by these falling objects

Injury of people/worker

+ Workers must alert wheninstallation of heavy steelmaterials and duringwelding works

+ Wear protective equipmentduring

installation and concreting works

Forman / Supervisor / Worker

Injury of people/

worker

+ Provide qualified personnels to do and supervise the job

Forman / Supervisor

5 Backfilling works Workers struck or

hit by falling fill materials or equipments

Injury of people/

worker

Provide proper equipment platform and qualified signal man for dump trucksunloading backfill

materials

Forman / Supervisor