PROJECT: TOYOTA HEADQUARTERS PP

THQ-LBL-MDS-005-0 (Concreting Works)

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WORKS METHOD STATEMENT

OF CONCRETING WORK
CONTENTS

1- INTRODUCTION

2- RELEVANT DOCUMENTS

3- RESPONSIBILITIES

4- QUALITY ASSURANCE AND QUALITY CONTROL

A. DESIGN MIX

5- MANPOWER AND EQUIPMENTS

6- CONTRUCTION METHOD

A. DESIGN MIX

B. FORMWORK

C. FALSEWORK

D. PRE-POUR INSPECTION

E. FORMWORK REMOVAL

F. REINFORCEMENT

G. PRE-POUR WORKS

H. CONTRUCTION JOINTS

I. FINISHING

J. POST-POUR WORKS

K. SCHEDULE OF WORK

7- HEALTH AND SAFETY

A. SAFETY MANAGER (SM)

B. EMERGENCY PLANS

C. SAFETY RISK AND ASSESEMENT

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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1- INTRODUCTION

The purpose of this document is to point out the various steps to be carried out for the general
features and sequence which this activity shall be performed in accordance with the
specification and as indicated in the approved drawings; to meet the requirements of the
Contract Works.

This work Method Statement has been arranged to give a clear guidance to the people
working at project site and to ascertain the limits and controls for the quality of works.

In this MDS, LBL international shall be identified as the ‘’Main Contractor’’, Archetype as the
‘’Consultant/Engineer’’ and Toyota as the “Client”.

2- RELEVANT DOCUMENTS

Relevant documents shall be composed of the following:

1. Safety Plan-submitted and reviewed by Engineer

2. Approved Construction Drawings-submitted.

3. This method statement

The Method Statement may change according to actual site condition.

3- RESPONSIBILITIES

1.0 The Project Manager or his Representatives shall be responsible for:

. Conduct all tasks safely in compliance with the specifications and scope of works
. Make sure that there are enough resources for project execution
. Track all reports and management procedures
. Control the process of work to make sure that the construction is on schedule.
. Deal and find solutions for any occurring problem on site and discuss it
with managing director and other relevant parties.

2.0 The QA/QC Manager (Mr. Eng Sen) shall be responsible in leading and directly
supervising the Quality Assurance and Quality Control of the aforesaid Works.

3.0 Safety Manager (Mr. Ngouv Chanvirak) is tasked to ensure that the major
objectives of the plan will be implemented properly to provide comprehensive
measures that will ensure the protection of life and properties as well as to
provide construction efficiency through selective use of safe work practices and
working conditions.
3.1 A personal to guard site access.

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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3.2 Safety Manager has to ensure daily safety work at the beginning of work
shifts such as hot work (cutting & wielding), working at height, working
plate form, and individual HSE…

4- QUALITY ASSURANCE AND QUALITY CONTROL

The structural works shall start, upon obtaining site opening permit. Works to be carried out
shall be in accordance with sequence as mentioned in Chapter 6.

LBL will employ sufficient qualified supervisors in addition to the experienced site workers
and foremen to supervise the structural works.

A. QUALITY ASSURANCE

The Contractor shall notify the Consultant within 24 hours through submittal of Request for
Inspection informing the type, time, date whenever the Contractor wants the Consultant to
inspect the works.

 Material as per the approval

 The rebar free from rust corrosion
 All the bars of the correct sizes as per drawing & specs.
 The spacing as per drawing & specs.
 The inspection of reinforcement after placing in position done
 Additional steel around cutouts / ducts / sleeves / lap lengths checked
 Whether chairs are provided to keep the top bar horizontal for footings/slabs etc.,
stirrups, hooks etc.
 Binding wire properly tightened
 Proper spacers are installed & are sufficient
 To ensure all the starter bars and splices of correct sizes & number

The Contractor has to ensure that works are being done according to the specifications
/approved drawings to achieve best quality.

5- MANPOWER AND EQUIPMENTS

 Tower cranes: 2cranes

 Vibrators: 6u
 Troweling Machine: 3u
 Hand tools: enough quantity to ensure work completed on time
 Concrete pumps: 1set from concrete supplier
 Steel bending machine: 2u
 Steel cutting machine: 2u
 Total stations: 1set
 Level machine: 2sets
 Laser level: 2sets

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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 Generator: 1set
 And other tools etc.
 Site manager: 1p
 Site engineers: 2p
 QC engineer:1p
 MEP engineers :2p
 Safety manager: 1p
 Safety supervisors:3p
 Skill workers: 50p to 200p following monthly progress

6- CONTRUCTION METHOD

A. DESIGN MIX

The design mix : refer to MAR of concrete.

Concrete testing : 3 samples of 3days and 28days age of beam and slab per
floor will be done at third party laboratory (Cast Lab) and the remaining samples will
be done at supplier lab test. Company profile and calibration certificated of Cast Lab
and concrete supplier have been submitted separately.

Number of concrete samples: will be taken as below:

B. FORMWORK

Formwork shall generally be Classic Plywood Formwork and Euroform

formwork. All formwork shall be designed and signed off by a Professional Engineer.
Calculation note for formwork to be submitted separately.
ITP form: to be submitted separately.

Formwork shall generally be fabricated in the formwork fabrication area. Once

formwork has been used, they shall be stored in designated areas for later use or
returned to the fabrication area for dismantling. In general, no redundant formwork
shall be left in / around the work areas.

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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Formwork shall be constructed to the exact sizes, shapes, lines and dimensions
shown on the drawings and as required to obtain accurate alignment, location, grades,
level and plumb of the finished structures in accordance with the schedule of the
tolerances.

Formwork shall be deemed to include all formers of openings recesses,

keyways, molding, chamfers etc. Formwork shall be cleaned prior to erection and
installation of reinforcement.

C. FALSEWORK

Falsework shall be erected to give sufficient support and bracing and allow for
any necessary adjustment for positioning and striking. Wedges, jacks or camber strips
to be provided to facilitate vertical adjustments. After concrete placement operations,
the falsework and formwork shall be inspected to determine abnormal deflection or
any signs of failure.

D. PRE-POUR INSPECTION

The following shall be checked prior to placement of concrete:

 Line, plumpness and level

 Shoring and ties
 Joints sealed
 Cleanliness and application of release agent and retarder (where required)
 Joint formers, chamfers, moldings, etc.
 Pour level strips (if applicable)
 Waterproofing system where applicable.

E. FORMWORK REMOVAL

Formwork shall be removed as below:

- Vertical formwork to wall, column and beam : after 16hours of concreting
- Soffit formwork to beam and slab: when the compressive strength of
concrete reach 75% of full requirement strength. Props to be re-fixed
immediately after removal of formwork.

F. REINFORCEMENT

The Contractor shall submit mill steel certificate with tensile test by third party
to Engineer for review. The Contractor shall ensure that the reinforcement is stored
correctly to avoid any adverse effects from the environment.
MAR for steel bar: has been submitted separately.
ITP form: to be submitted separately.
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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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Reinforcement, once cut and bent following approved shop drawing, shall be stored in
the lay down area or on off ground supports and shall only be delivered to the work
area when required. All bars will be tagged as per the bending schedule. All scrapped
or unused reinforcement shall be stored in a central area before being removed from
site. In general, no loose or scrap reinforcement shall be left in / around the work areas.

Concrete spacer blocks or steel chair shall be used to support the bottom layers
of reinforcement and to space reinforcement from edge forms. Mortar spacer may be
used to space reinforcement from edge forms. The spacer block shall be selected to
provide the correct cover to the bottom reinforcement layer.
Where required, steel chairs shall be scheduled and fabricated to support
intermediate and top layers of reinforcement, spacing of chairs will be max 2m.
Reinforcement shall be installed once the blinding, soffit formwork or preparation of
the supporting / adjacent concrete element has been inspected and signed off.

Cleanliness during fixing of the reinforcement is a priority. Any rubbish or loose

particles are not to be dropped in the pour area. The pour area will be blown clear
before concrete placement. Where reinforcement is used to secure formwork or cast
– in items and the welding may be detrimental to the reinforcement bar, a dummy
reinforcement bar shall be fixed. The starter bar positions are critical and must be
checked.

The following checks shall be conducted prior to placement of concrete:

 Ensure correct cover is provided
 Reinforcement fixing shall be in accordance with the drawings
 Starter bars, trimmer bars, etc are fixed in correct locations
 Top level of reinforcement is correct
 Reinforcement shall be clean
 Stop ends fixed correctly
 Cast in items are correctly placed and securely fixed.

G. PRE-POUR WORKS

The engineer shall be notified 24 hours prior to placing of concrete for inspection of

formwork and concrete reinforcement. The interior of forms shall be cleaned

thoroughly. The surface and reinforcement shall be sprayed with clean water prior to

concrete pouring. While placing concrete, objects such as anchor bolts, reinforcing

bars and other fixtures shall be monitored for movement. ITP list will be submitted

separately.

The concrete slump shall be such that it can be easily placed without
segregation. If the concrete is acceptable, it will continue to be discharged. Slump test
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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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shall be taken at every load of concrete. The load shall be accepted if the concrete
slump at the point of discharge is within tolerance for the design mix ordered. If the
slump is below tolerance, the load shall be rejected. The concrete is to be agitated
continuously by rotation of the mixer drum during transport to the Site and while waiting
discharge. Concrete shall be discharge from the delivery vehicle within 2 hours after
the time of loading.

Vibrators or other suitable tools shall be used to ensure the required

compaction is achieved. Vibrators shall be inserted and vertically and not used to move
concrete at least one spare vibrator will be available at all times.

Concrete shall be deposited as quickly as practicable in its final position to avoid

segregation and cold joints, max free fall is 1.5m. Concrete that has partially hardened
or been contaminated with foreign materials shall not be deposited in the structure.
Chutes should preferably be of rounded cross section to avoid the accumulation of
concrete in corners. Concrete shall be poured in alternate panels if construction joints
are required in concrete slab pours.
In the event of rain occurring during a pour, the live faces of the layers of
concrete will be kept as close as possible to minimize the exposed horizontal concrete
to the rain. Where possible the pour rate will be slowed, particularly considering the
life of the concrete should increase due to the moisture in the air. Where the pour rate
is slowed, additional retarder (which has been approved by the Client and the complied
with the contract specification requirement) may be added to the mix to keep the
concrete live longer. Generally free water in forms will be blown to the edge of the
pours and removed.

H. CONTRUCTION JOINTS

Construction joints shall be permitted only where indicated on approved

construction drawings. The surface for all construction joints shall be horizontal and
vertical. Irregular construction joints shall not be permitted. When water tight
construction is required, a waterstop shall be set in position, as detailed and fixed
securely so that the waterstop will not move or be damaged when concreting. If a
surface is cast against another surface which has hardened, the existing surface shall
be roughened, cleaned, thoroughly wetted and covered with specified bonding
compound (datasheet to be submitted to engineer for review).

I. FINISHING

When the concrete is poured to level, the surface will be finished generally.
Areas of specialized finishes will be treated separately.

Holes left by the withdrawal of the tie rods shall be filled solidly with non – shrink
mortar (datasheet to be submitted to engineer for review) and finished to match the
surrounding surface. All exposed concrete shall be free from bulges, honeycomb, fins
and other similar surface defects.

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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When the concrete has stiffened sufficiently, the surface shall be bowelled by
hand or by machine sufficiently to produce a uniform surface free from screed marks
and to ensure that the surface of the concrete is within tolerance.

J. POST-POUR WORKS

Concrete placed shall be cured as following:

 Keep the concrete surface wet until 7days age by spray water or cover
by wet tissue or straw.
 Removed of slop ends will be stripped as soon as the concrete has
hardened. The joint will be green cut by jet washing or mechanical
method.
 Surveys shall be completed within 48 hours following pour completion.
A post pour inspection will be carried out to highlight any areas for repair.
Material to repair to be submitted to engineer to review.
K. SCHEDULE OF WORK

Detail schedule per tasks: columns, wall, beam, slab and ramp will be submitted
separately.

7- HEALTH AND SAFETY

A. SAFETY MANAGER (SM)

The Safety Manager is tasked with ensuring that the major objectives of the plan will be
implemented properly to provide comprehensive measures that will ensure the protection of
life and properties as well as to provide construction efficiency through selective use of safe
work practices and working conditions.

B. EMERGENCY PLANS

The Contractor will make necessary arrangements with a general hospital near the vicinity of
the site for providing proper and expeditious medical care during the execution of the works.
Safety Personnel shall be assigned to carry our first aid treatment prior to shifting the patient
to hospital if necessary and shall be available at all times within the vicinity of the working
site.

An emergency vehicle equipped with mobile phone will be assigned for carrying the
sick/injured to the hospital. The vehicle driver shall have the same communication to receive
any emergency call relative to Safety matters and shall be available always within the vicinity
of the working site. The SM will immediately report to the Consultant the particulars of any
accident or any unusual or unforeseen occurrences on the site, whether or not they are likely
to affect the progress of works.

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PROJECT: TOYOTA HEADQUARTERS PP
THQ-LBL-MDS-005-0 (Concreting Works)

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C. SAFETY RISK ASSESMENT

The Safety Officer shall identify the hazard, the people who might be harmed, evaluate the
risks and decide on precautions, in accordance with the safety plan.
In order to evaluate the hazard assessment, the Contractor shall conduct inspections of all
workplaces to determine the need for PPE and help in selecting the proper PPE for each
tasks performed. Each survey will document the workplace surveyed, date of survey, the
identified source of hazards and precautions to be implemented.

The Contractor ensures that the PPE program is implemented in the work area; defective or
damaged equipment are to be immediately replaced; workers must attend required training
sessions and records on hazard assessments are maintained.
The safety program is to be regularly reviewed, evaluated and if necessary, updated
according to site and working conditions.

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