METHOD STATEMENT FOR TG FOUNDATION AND TURBINE BUILDING

The purpose of this method is to describe the methodology and sequence involved in construction work for Foundation of Turbine buildingTurbine pedestal (lower part) and to detail out the steps to be taken in order to meet the technical requirement of Van Phong 1 thermal power plant project

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Project Title

AND TURBINE BUILDING

Document Type For Approval

No Section/

Page

Date

Status O/C * Remarks

1 3 (1) Organization and qualified personnel be

submitted to prove

(2) Update the slope of excavated area

(3) Please show basis of that DHI choose 30 degree cel of fresh mass concrete Calculation of max tempt at core to be added, this helps to give proper method to control crack due to heat hydration

(4) item 7.8.8- Statement is NOT OK show clearly the sketch of thermocouples and plan of detail time schedule of tempt monitoring record (start point, interval time to the end) Thermometer to be set up from the bottom of concrete to top and distance to the outer surface/bottom should be 30~40cm

(5) Form-work support calculation is not in line with drawings (p46 and p38)

Curing time and formwork are highly recommended to keep enough time before remove

(1) Additional Organization Chart in MS - page 6 (2) Excavation slope of weathered rock is normal 1:0,3~1:0,5, depending on the actual condition

we will modify up to 1:1 (if necessary) - page 10~19

(3) Reference documents Proposal of Concrete Mix Proportion for Mass Concrete (Rev.A) VP1-0-L4-Q-GEN-10047 - page 51

- Reference documents Part III-2 Exhibit B1

Appendix G (page 68 – 70o C) and ACI 301 item 310.4.d (158F degree) - page 52

(4) Lot 4 revised in revision B (page 51 & 52) (5) Please show the detail for this comment

Lot 4 will curing by 7 days (as period time for temperature monitoring) - page 51

(1) Noted (2) Noted (3) Not address the concern regarding the control the temperature not exceed 20 degree cel between monitoring points To ensure mass concrete center temperature shall not exceed 70°C, consider using pre-installed cooling pipes is recommended

(4) Noted that monitoring the temperature, P1 P2 P3 shall be recorded in time orderly

Format of record should be attached

(5) Please attach the detail form work for TG foundation (noted that dimensions on page 50 cannot read)

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1 Soil excavation & transportation

2 Soil preparation, testing, survey work &

inspections prior to install lean concrete

3 Rebar & formwork fabrications, formwork surface preparation, storage & transportation

4 Rebar & formwork installation methods

5 Level marking method

6 Inspections prior to concrete pouring

7 Raining prevention method during concrete pouring

8 Method of concrete pouring

9 Concrete curing process

10 Formwork dismantling method & storage

11 Concrete surface/defect preparation method prior to bitumen painting

12 Final inspection prior soil back filling

13 Soil backfilling, compaction & FDT

MS for Excavation & Backfilling Works_PE - page 20, 21

Reference document VP1-0-L4-C-GEN-10007-C

MS General Concrete Work_PE - page 48

6 reconfirm the type of crane & tonnage (mobile

crane or high-up truck crane)

Lot 4 revised and added on revision B - page 7 05/05/2020 O

3 7 This drawing is not clear on page 7&8

The above measures can not be seen What would like DHI show by this drawing?

This is Design Drawing, contractor have already replaced for good looking on Rev.B - page 8 & 9

(This is pre-excavation elevation so Lot 4 deleted

it )

5 9 Soil surface preparation, compaction; FDT (if

necessary) & inspection prior to lean concrete need to be done

Lot 4 revised on revision B - page 10~19 05/05/2020 O

Closed

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6 9 Visual inspection on concrete surface & defect

rectification needs to be carried out prior to Bitumen painting work

Visual inspection on concrete surface & defect rectification shall be carried out prior to Bitumen painting work - Reference ITP VP1-0-L4-C-GEN-

10028 - Rev.B - page 11~19

7 9 Final inspection on Bitumen painting surface

needs to carried out prior to soil backfilling &

All the followings are the same expression

Lot 4 revised in revision B - page 10~19 05/05/2020 O

9 10 1 Soil excavation

2 Bottom soil/soil surface preparation (removing loose material & compaction) including survey work

3 Installation of formwork & inspection prior to pour lean concrete

4 Pouring lean concrete

5 Survey setting out, installation of rebar &

formwork

6 Installation of concrete level marking & final inspection prior to pouring concrete

7 Concrete curing & dismantling of formwork

8 Visual inspection on concrete surface/ defect &

repairing work prior to Bitumen painting

9 Final inspection prior to soil backfilling

10 Soil backfilling, compaction & FDT (if required)

Lot 4 revised in revision B Same as No.2 Reply

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location on Rev.B - page 15~18

12 13 same step as mentioned at item 7 of pg 10 phase

01

13 14 Dewatering method of GWL should be stated Lot 4 revised in revision B - same as No.11 reply 05/05/2020 O

01

17 19 Backfill procedure should refer to

VP1-0-L4-C-GEN-10008

Backfilling works refer Backfill procedure L4-C-GEN-10008 - page 21

18 19 Ensure sufficient working space, safe condition

wall soil cutting, provide proper access (2 at least)

& watch man

Lot 4 revised in revision B - page 20 05/05/2020 O

ITP for General Excavation & Backfilling Works_PE - page 22

21 27 Relationship between this pouring lean concrete

and TG foundation should be stated

Lot 4 added drawing in Rev.B - page 29 05/05/2020 O

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22 31 Is there intend to rigging by this? It should not be

permitted in this project for such kind of lifting point

Regarding the bearing capacity and welding standards for the lifting of CEP pipes, contractor shall invite a third party with full roles and functions to censor it And added drawing on revision B - page 34

23 33 should be calculated Regarding the calculation of bearing capacity of

tension wire, we find it unnecessary because the tension wire only for the purpose of formwork to

be vertical , the pressure due to concrete having

a calculation of tie rod - page 36~37

26 42 Material and size of anchor frame should be

shown

The material of anchor frame is steel box 50x50x2.5 dimension change due height of the column - page 45

29 46 Night time pouring is better for this mass concrete

Night time pouring is better for this mass concrete to reducing concrete temperature

We will carry out casting concrete around from 17h00PM - page 50

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- Recommend using circulating cool water (with ice) for curing

ice) is not necessary.The curing material include

3 layer with spray water on the surface as method can prevent high temperature, direct sunlight, low humidity and drying winds and keep stable temperature for concrete - page 51

31 52 Please describe detail where is approved dump

yard?

Contractor signed contract with third party with full roles and functions approved by the functional departments - page 55

32 54 This is not JSA Revised JSA according to project standards -

page 56

33 54 1 This is for reminder again that it seem no

review from Doosan's HSE team on this document

2 Please prepare the risk assessment in line with Doosan's risk assessment procedure

3 The steps of risk assessment should detail and based on Method statement

This document have already reviewed from Doosan's HSE team

The risk assessment in line with Doosan's risk assessment procedure

The steps of risk assessment showed detail and based on Method statement

34 58 Include JSA for deep soil excavation, working into

deep soil excavation areas, confined space,

working at heights

35 74 No need to attach design drawing

Request to attach detail schedule

Additional Notes (if any)

* O - Open, C – Closed

Closed

OPENThere is no risk assessment in this document Please check againClosed

Closed

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METHOD STATEMENT FOR TG FOUNDATION AND TURBINE BUILDING

EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

Information acknowledged with no comment

REVIEWED WITH COMMENT RC

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

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TABLE OF CONTENTS

1 PURPOSE 4

2 RESPONSIBILITIES 4

3 REFERENCE CODE & STANDARD 4

4 MANPOWER & EQUIPMENT 5

4 1 Manpower 5

4 2 Equipment 6

5 SURVEY & SETTING OUT 7

6 GENERAL ARRANGEMENT OF TG FOUNDATION ……… 8

7 WORKING METHOD 10

7.1 Sequence excavation and backfilling for TG Foundation & Turbine building Area… … 10

7.1 1 Excavation work ……….……… 20

7.1 2 Backfilling work……… 21

7.2 Method of Installation CEP CAN 23

7.3 Method of typical concrete wall of CEP Pit, CW discharge, BFPT 35

7.4 Lean Concrete 37

7.5 Rebar Installation& fixing( Refer to Method Statement for General Concrete Work) 38

7.6 Formwork Installing 41

7.7 Anchor bolt installation (Refer to Method Statement for General Concrete Work) 43

7.7.1 Sequence for Anchor Bolt 43

7.7.2 Section of Setting Anchor Bolt 45

7.8 Concrete Casting 48

7.8.1 Concrete casting for TG building Foundation……….48

7.8.2.Concrete casting for TG Foundation 48

7.8.3 Concrete Mix Control and delivering 48

7.8.4 Planning 48

7.8.5 Casting concrete 49

7.8.6 Pouring 50

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7.8.7 Protection& Curing 50

7.8.8 Temperature Control 51

7.8.9 Estimated Quantity of TG Foundation 55

7.8.10 Bitum painting for foundation 55

7.8.11 Soil Backfilling for foundation 55

7.9 List of Attachment 55

8 INSPECTION AND TESTING 55

9 ENVIRONMENT, HEALTH AND SAFETY ( EHS) 55 Attachment: Formwork Calculation

B

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1.0 PURPOSE

The purpose of this method is to describe the methodology and sequence involved in construction work for Foundation of Turbine building/Turbine pedestal (lower part) and to detail out the steps to be taken in order to meet the technical requirement of Van Phong 1 thermal power plant project

General instruction:

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

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

This method statement describes the work procedures to be carried out during an execution stage of Foundations/structures of which the character of the concrete is technically specified as a structure with large dimensions like identical TG Pedestal Foundation (2nos)

2.3 Contractor’s designated Site Engineer shall be supervising closely the activities designated to them and ensure that all instructions are followed and all necessary work permits are in place prior to commencing the work and safety procedures of the project is strictly adhered to

2.4 Contractor’s Safety Manager is responsible for the enforcement of safety and ensures that the works are carried out in accordance with Client safety procedure

2.5 Contractor’s QC Manager is responsible for inspecting the reinforcement prior to pouring concrete to check the quality of work as per specification and approved drawings

3.0 REFERENCE CODE & STANDARD

3.1 TCVN 1651-2 - Rebar work

3.2 ACI 347 - Fabricate and installation Formwork

3.3 ASTM C309 - Concrete curing

3.4 ACI 305 - Placing concrete in hot weather

3.5 ACI 306 - Placing concrete in cold weather

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4.0 MANPOWER & EQUIPMENT FOR TG FOUNDATION

4.1 Manpower

The number of official is arranged as follows:

- Head of the steering committee:

- Vice head of the steering committee:

- Steering committee engineering (engineer):

- Surveying and supervisor (engineer):

- Quality Control team

- In charge of work labor safety:

• Total manpower: 87 persons

• Above table is just initial proposal and actual manpower will be changed depending on site condition

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SITE PROJECT ORGANIZATION CHART - BD234 JSC

- Qualified personnel be attach

4.2 Equipment

Based on estimated volume of work, approximately machine like under tabulation The number of equipments and machines as follow:

capacity Mobilization plan

B

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5 Bend machine 2,2 KW 4

• Above table is just initial proposal and actual equipment will be changed depending on site condition

5.0 SURVEY AND SETTING OUT

Prior to the work commencement, construction drawing will be reviewed to check of its latest issuance for construction Layout and survey marking will be marked using surveying equipment (total station, level machine) having a valid calibration certificate

The certificate of the total station and automatic level have been calibrated by third party

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6.0 GENERAL ARRANGEMENT OF TG FOUNDATION

TURBINE GENERATOR UNIT #1

B

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TURBINE GENERATOR UNIT #2

B

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7.0 WORK METHOD

7.1 Sequence excavation and backfilling for TG Foundation & Turbine building Area

SEQUENCE OF CONSTRUCTION PLAN UNIT #1

SEQUENCE OF CONSTRUCTION INCLUDES 5 PHASES, 1 PHASE INCLUDING WORK AS FOLLOW:

+ EXCAVATION WORK (EXCAVATION SLOPE OF WEATHERED ROCK IS 1:0,3~1:0,5 DEPENDING ON THE ACTUAL CONDITION, ACCORDING TO TCVN STANDARD 4054:2005 ITEM 7.7.1)

+ LEAN CONCRETE (SOIL SURFACE PREPARATION, COMPACTION; FDT (IF NECESSARY) & INSPECTION PRIOR TO

LEAN CONCRETE)

+ REBAR, FORMWORK

+ CASTING CONCRETE

+ CURING CONCRETE & REMOVE FORMWORK

+ BITUMINE PAINTING (REFERENCE ITP VP1-0-L4-C-GEN-10028)

+ BACKFILL (REFERENCE ITP FOR GENERAL EXCAVATION AND BACKFILLING WORK VP1-0-L4-C-GEN-10012)

(SEQUENCE OF CONSTRUCTION PLAN UNIT #2 SAME AS UNIT # 1)

B

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PHASE 01

Step 1: Excavate Axis T1 and TA-TE; EL +1.7m to EL+1.1m & axis T8-T9 and TA-TE EL +3.5m to EL +1.9m

Step 2: Bottom soil/soil surface preparation (removing loose material & compaction) including survey work

Step 3: Installation of formwork & inspection prior to pour lean concrete

Step 4: Pouring lean concrete

Step 5: Survey setting out, installation of rebar & formwork

Step 6: Installation of concrete level marking & final inspection prior to pouring concrete

Step 7: Concrete curing & dismantling of formwork

Step 8: Visual inspection on concrete surface/ defect & repairing work prior to Bitumen painting (Reference ITP for bitum panting work VP1-0-L4-C-GEN-10028)

Step 9: Final inspection prior to soil backfilling. (Reference ITP for general excavation and backfilling work VP1-0-L4-C-GEN-10012)Step 10: Soil backfilling, compaction & FDT (if required)

B

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PHASE 02

B

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Step 1: Excavation axis T2 and TA-TE, from EL +1.7m to EL -2.15m

B

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PHASE 03

Phase 03.1

Step 1: Excavation TG Foundation EL +1.7m to EL -2.15m (Axis T3-T7 and TA-TE)

B

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Phase 03.2

Step 1: Excavation for CEP EL+1.7m to EL -6.4m (Axis T4-T6 and TE)

Step 9: Final inspection prior to soil backfilling.(Reference ITP for general excavation and backfilling work VP1-0-L4-C-GEN-10012)Step 10: Soil backfilling, compaction & FDT (if required)

B

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B

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PHASE 04

Step 1: Excavation for foundation Axis T6-T8 and TA-TB from EL+3.6m to EL+3.15m

B

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PHASE 05

Step 1: Excavation for foundation Axis T1-T11 and TE-CA , axis T10-T11 and TA-TE from EL+3.600 to EL+1.900;

EL+4.700 to EL+1.9m; EL+2.3m to EL+1.75m

B

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B

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Typical Section of Foundation Excavation (F2A FDN)

- Depending on the actual condition we will carried out expansion excavation (if necessary)

- Ensure sufficient working space, safe condition wall soil cutting, provide proper access (2 at least) & watch man

7.1.1 Excavation work (Refer to Method Statement for Excavation and backfill works NoVP1-0-L4-C-GEN-10008)

The excavated material shall be loaded on dump truck and store designated area for future backfilling (if required)

The bottom level of excavation for foundation shall be checked by survey engineer using automatic level as design

drawing The bottom level shall be compacted and leveled providing smooth surface Rubbish and mud in bottom surface shall be wiped out and cleaned

B

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7.1.2 Backfilling Work: (Refer to MS for Excavation and Backfilling Works VP1-0-L4-C-GEN-10008)

Backfill work shall be carrying out after remove formwork and bituminous painting work as follows:

B

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B

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7.2 Method of Installing CEP CAN

Filling concrete of CEP CAN shall be carried out before casting lean concrete of TG Pedestal FDN

Excavation of CEP CAN shall be carried out simultaneously with excavation of TG Pedestal FDN, Dimension of excavated pit as attached

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Page | 24 B

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SECTION OF EXCAVATION WORKS OF CEP CAN

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INSTALLATION OF CEP CAN FOLLOW 6 STEPS:

After excavated soil to be carried out for installation of formwork inside of CEP CAN hole, the formwork and casting filling concrete shall be divided into 04 stage form elevation of bottom level of CEP CAN to surface lean concrete elevation of CEP pit

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B

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B

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B

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B

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INSTALATION OF CEP CAN BY CRANE 50T

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After fixing the pipe of CEP CAN to conduct casting concrete to the Gap between the CEP CAN pipe and concrete wall

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Some pictures about CEP CAN at other project before:

B

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DETAIL OF HOOK FOR LIFTING

B

Tiêu đề	Method Statement For Tg Foundation And Turbine Building
Thể loại	For Approval
Năm xuất bản	2020

Định dạng
Số trang	88
Dung lượng	5,65 MB