METHOD STATEMENT FOR WATER PROOFING OF UNDERGROUND CONCRETE STRUCTURES

The purpose of this Method Statement is to describe the methodology involved in application of protective coating (Bitumen Emulsion Paint) for underground concrete foundations and to details out the steps to be taken in meeting the technical standards and EHS requirements of Van Phong 1 BOT Thermal Power Plant.

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Project Title Van Phong 1 BOT Thermal Power Plant Project

Document Title METHOD STATEMENT FOR WATER PROOFING

OF UNDERGROUND CONCRETE STRUCTURES

Document Type For Approval

CRS No VP1-0-L4-C-GEN-10027-A-CRS CRS Issued Date 12/05/2020 Engineer Construction

No Section/

Page

Date

Status O/C * Remarks

1 3 This should be more monitored before painted Lot 4 added on revision B 12/05/2020 O

thickness of this coating?

- How to estimate the timing duration for drying each layer?

Additional Notes (if any)

* O - Open, C – Closed

Closed

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METHOD STATEMENT FOR WATER PROOFING OF UNDERGROUND CONCRETE

STRUCTURES

EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

Contractor to revise the correction and resubmit

Revise the correction and resubmit before proceeding

Information acknowledged with no comment

Information acknowledged with comments Note: Approval or comment does not relieve the Contractor of

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VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT CONTENTS 1 PREFACE 2

2 REFERENCE 2

3 MACHINERY & EQUIPMENT 2

4 RESPONSIBILITIES 2

5 PROCEDURE AND SEQUENCE 3

6 QUALITY CONTROL 4

7 ENVIRONMENT, HEALTH AND SAFETY (EHS) 5

8 GPS MEMBRANE SPECIFICATION 23

9 ATTACHMENT .25

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 Plant Project/Project : Van Phong 1 BOT Thermal Power Plant Project

 Company/Owner : Van Phong Power Company Limited (VPCL)

 Contractor : EPC

2.0 REFERENCE

 ASTM C309

 GPS ‘s Specification

3.0 MACHINERY & EQUIPMENT

No Description Remark

• EHS Manager will ensure in coordination with Site Engineer that all measure/construction taken shall be maintained till completion of job

• It is the responsibility of Construction Manager/Site Engineer that construction activities are executed according to the relevant project specification in compliance with the quality,

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VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

schedule & safety requirements

• EPC will ensure that all works are performed safety according to the attachment

• The relevant EPC Supervisor will ensure that the work is carried out in accordance with this method statement and project specification

• The QC Inspector will ensure that the work is executed according to the requirements of quality dossier are fulfilled

5.0 PROCEDURE AND SEQUENCE

4.1 Bitumen Emulsion Paint 4.1.1Surface Preparation

 All surfaces must be free of grease, oil and dust Very smooth surfaces should be roughened for better adhesion Loose rust, moss, lichens, crumbling cement, deteriorated fiber cement and degraded bituminous substances must be removed either mechanically or chemically

 Surface faults such as blisters, holes and cracks should be cleaned out, then repaired with a flexible filler such as silicon, mastic, etc Small hairline cracks will be monitoring case by case specification and proposal method to repair if cracks development, if not development can be painted with bitumen waterproofing emulsion by brush in, allow in dry then repeat until filled or at least sealed

 Arises shall be rounded off and surface protrusions shall be grind down to ensure a smooth substrate

 All standing water shall be removed from the concrete

4.1.2 Temperature Conditions

 Before applying, the surface temperature must be within 5ºC - 40ºC If temperature is too high, surfaces should be cooled down by water Surface should be moist but water is not allowed to remain on the surface

4.1.3 Application

B

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 It is imperative that Bitumen Waterproofing Emulsion is applied to a clean surface to ensure

a firm enduring bond to substrate

 Application shall be by brush roller or squeegees on to the previously prepared substrate

 Allow the first coat to dry before applying the second coat, allow the second coat to dry before applying the third coat, in accordance with ASTM specifications Contractor can use coverage meter to check thickness, as the manufacture testing estimate the timing duration for drying each layer is 4-5 hours

6.0 QUALITY CONTROL

•The Site Inspection and Test Plan (ITP) for this work summarizes various characteristics to

be checked The concerned Site Engineer/Foreman will be responsible to ensure stage wise

Concrete StructurePrimer coatingBituminous coatingBituminous final coating

B

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compliance for this operation and the Site QA/QC Engineer/Inspector will carry-out quality control checks and report the inspection results

7.0 ENVIRONMENT, HEALTH AND SAFETY (EHS)

•Personal Protective Equipment (PPE) shall be worn at all times

•Good housekeeping shall be observed in work areas

•Construction wastes shall be segregated and disposed to an approved dump yard area

•Adequate lighting equipment when working night time

•Ensure all workers and equipment working overtime are properly accounted and obtained permit/approval from Doosan EHS Manager prior to carry-on works

•Periodic refresher trainings, tool box talk and audit shall be conducted

7.2 Safety

•Personal Protective Equipment (PPE) will be issued to all workers such as safety shoes, hard hat, working gloves, earplug, safety goggles, reflective vest and safety harness for workers who will be assigned

•Wearing of the basic PPE will be enforced fully

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7.3 Job Safety Analysis

APPENDIX A

Risk Assess ment

1.1.1 Hazards and safety precautions unidentified

-Incompliance with DVN permits to work requirements

-PTW is not granted -Down time

assigned

information be write and thick on the certificate

-Permit applicant ensure RA and

AA sign the daily approval part before proceed activity at site

1.2.1 Improper body posture

posture/method for manual handling

-Use buddy system as help of friend or use machinery

- Use legs not back to lift -Do not manual carrying material with over 25kg alone

- Use mechanical lifting whenever possible

training

- Brief to workers related

to back injury prevention

Site Supervisor

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been unplug from outlet before inspection

-Only authorized person are allowed to perform inspection activity

2 B L

1.3 Equipment/

tools and material mobilizatio

n to worksite

hand injury prevention

-To wear hand protection (hand gloves)

training (hand injury)

Site Supervisor

1.3.2 Uncertified equipment

-Equipment not granted to use

-all equipment must be in good condition

-No modification on tools and equipment are allowed to be inspect

unloading materials (manual handling/Lif ting)

Musculoskeletal disorder

Back pain

-Implement buddy system during perform manual handling

- Use legs not back to lift -Do not manual carrying material with over 25Kg alone

training -Brief to workers related

Site Supervisor

hand injury prevention

training (hand

Site Supervisor

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-To wear hand protection (hand gloves)

injury)

injury

point hazard during handle the material

-Use a suitable hand glove

training for pinch point

Site Supervisor

1.5.1 Lorry Crane topple due to unstable ground

-property damaged -physical injury

be level and compact

-Lorry must be inspected with colour coding

- Operator must have full attention and not allowed to use cell phone

- Use flagmen to direct equipment operators, keep all other workers clear of operating equipment

- To follow speed limit of 10km/h

- Contractor to ensure vehicle in good condition

coding system

be implemented

Site Supervisor Lifting Crew Operator

authorized person Maintenance of crane to be once a month in according to manufacturer’s instructions

- Contractor to ensure vehicle in good condition

-Crane must be inspected with colour coding

- Operator must have full attention and not allowed to use cell phone

coding system

be implemented

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damaged -physical injury

-Barricade the working radius

-Provide warning sign “No Entry, Lifting Operation in Progress”

-Banks man/signalman to be provided

-All materials which to be loaded are to be checked by Lifting supervisor on the correct and safe rigging method

-Must control LOAD by using double

damaged -Physical injury

-Barricade the working radius

-Provide warning sign “No Entry, Lifting Operation in Progress”

-All materials which to be loaded are to be checked by Lifting supervisor on the correct and safe rigging method

-Loads are not to be lift over personnel

coding system

be implemented

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-Personnel are not to stand under suspended loads

-All small items to be placed in an approved metal basket and all loose materials to be secured before hoisting

-Must control LOAD by using double tagline

damaged -physical injury

warned of others crane users

-Avoid two cranes operating at the same time in the same area

-Lifting supervisors to plan and coordinate on the lifting with operator and rigger / signalman of the boom swing area, hoisting, lowering path and visibility

-Crane operator and rigger / signalman must maintain contact

by means of communications set and remain visible / alert all the time

-All communications to be tested and checked before in operations

–All lifting supervisor and rigger/signal man to be equipped with whistle and luminous vest

-Crane operators should not leave his seat during hoisting

coding system

be implemented

Musculoskeletal disorder

Back pain

-Implement buddy system during

training -Brief to workers related

Site Supervisor

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perform manual handling

- Use legs not back to lift -Do not manual carrying material with over 20Kg alone

2 Surface

Preparation

2.1 Clean surface by stiff wire brushing

-Ensure use additional PPE (N95 mask) and Safety glasses

2.1.2 Slippery floor can cause

slip and fall

clay -Proper lighting to be provided -Ensure no water stagnant on the floor

3 B L Slip, trip and fall

awareness training

Site Supervisor

-Muscle strain and body fatigue

activity -Proper body posture during cleaning activity

training

Site Supervisor

2.1.4 Heat stress /Dehydration

- Collapsed and faint

the work

- Sufficient supply of fresh and clean drinking water to avoid dehydration

-Heat stress campaign and awareness training

Site supervisor

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working area (100-lux working area/50-lux access)

test before start activity

Site Supervisor

3 Placing Mastic of

Emulsion Paint 3.1 Mix

skim coat with clean water and place mastic on surface

effect -Eye injury -Skin irritation

start -To ensure continuous ventilation for inside building area (using air blower)

-To provide portable eye wash -to wear proper hand

gloves(chemical gloves), safety glass and face mask (N95)

activity -Proper body posture during material handling

training

Site Supervisor

the work

campaign and awareness training

-Dedicated temporary chemical storage to stored paint chemical (avoid placing on the naked ground

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surface)

3.1.5 Mastic splash to eyes

to handle chemical -To provide portable eye wash -To wear safety goggle to perform this activity

from any flammable/toxic atmosphere and has sufficient oxygen for normal breathing

-Ensure to provide two way ventilation(suck in/suck out)

to be built -Safety net to be installed underneath the elevated working platform if practicable

-Gap between elevated work platform and wall must not be greater than 300 mm

-Covering/hard barricaded with warning sign for opening on elevated work platform

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-No unauthorized removing cover

of opening -Sufficient lighting for the whole elevated working platform (100lux working

-Use provided access and egress and no taking shortcut

-Use free hands while climbing ladder (3 points contatcs)

4 Placing

Emulsion Paint

4.1 Place emulsion

on surface

effect -Eye injury -Skin irritation

start -To ensure continuous ventilation for inside building area

-To provide portable eye wash -to wear proper hand gloves (chemical gloves), safety glass and face mask (N95)

activity -Proper body posture during material handling

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-Chemical container must close with cover all the time when not in use

awareness training

effect

tray -Not put paint bucket around access and egress area

to be built -Safety net to be installed underneath the elevated working platform if practicable

-Gap between elevated work platform and wall must not be greater than 300 mm

-Covering/hard barricaded with

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warning sign for opening on elevated work platform -No unauthorized removing cover

of opening -Sufficient lighting for the whole elevated working platform (100lux working area/50lux access)

-All personnel to be trained with WAH

-All personnel compulsory to use safety harness with DOUBLE LANYARD on elevated work platform

-Use provided access and egress and no taking shortcut

-Use free hands while climbing ladder (3 points contatcs)

start -To ensure continuous ventilation for inside building area

-To provide portable eye wash -to wear proper hand

gloves(chemical gloves), safety glass and face mask (N95)

Site Supervisor

activity -Proper body posture during material

handling

training

Site Supervisor

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effect

tray -Chemical container must close with cover all the time when not in use

handling awareness training

Site Supervisor

the work

campaign and awareness training

Tiêu đề	Method Statement For Water Proofing Of Underground Concrete Structures
Trường học	Van Phong Power Company Limited
Chuyên ngành	Civil Engineering
Thể loại	for approval
Năm xuất bản	2020
Thành phố	Van Phong

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Số trang	29
Dung lượng	2,38 MB