METHOD STATEMENT FOR ESTABLISHMENT OF PERMANENT BENCHMARK SYSTEM

Comment Response Sheet (CRS)
Project Title

Van Phong 1 BOT Thermal Power Plant Project

Document Title

METHOD STATEMENT FOR ESTABLISHMENT OF
PERMANENT BENCHMARK SYSTEM

Document No

Document Type

For Information

Returned Status

RC

Prepared by

CRS Issued Date

23/03/2020

Engineer

VP1-0-L4-C-GEN-10018
VP1-0-L4-C-GEN-10018-A-CRS

CRS No

No.

4

Section/
Page

1

1

2

3

3

11

11

Owner’s Comment

Review
Date

Status O/C *

Noted.

23/03/2020

Closed
O

DHI added TCVN 9360 : 2012- Settlemet
monitoring work. Please refer reversion B.

23/03/2020

Closed
O

23/03/2020
Is it license software?

QCVN and TCVN did not specific provisions. So
it has not license. The reversion B added more
Hhmaps soltware.

23/03/2020

23/03/2020
Due to impact of external factor during
construction, please supplement the schedule of
measuring cycle until shut settlement (stabilization
settlement) of benchmark

Stability of permanent benchmark shall be check
with 6 months for one time.

23/03/2020

23/03/2020
Remind:
The benchmark system has to established by
qualified party according to the Construction Law.
23/03/2020
Add TCVN 9360:2012

Response to Comment

Remarks

Not agree,
CodesO
is not related to software
silence.
OPEN
O
- Please supplement schedule for this
activity so that we can follow up.
- Frequency at beginning time should
be 1 month; then it will be reduce
base on the stability of benchmark.
- Kindly be informed that the report
and its procedure may be reviewed by
National Acceptance Committee in

future.

Page 1 of 2


Comment Response Sheet (CRS)
5

12

23/03/2020
Shall this company issue the report for establish
Benchmark?

The Data of National benchmark is public

23/03/2020

Closed
O

23/03/2020

Closed
O

ownership and to accuracy construction process
be unified. So the original data supply sheet in
document No: VP1-0-L4-C-GEN00002_Topographic&Bathymetric
Report(Rev.C) shall be reuse other survey report

if necessary.
.

6

14

23/03/2020
Why the survey equipment is owned by other
name of company?

That is one of Sub-suppliers of Him Lam.

Additional Notes (if any)
* O - Open, C – Closed

Page 2 of 2


AP

APPROVED
Approved

AC

APPROVED WITH COMMENT
Contractor to revise the correction and resubmit

NA

NOT APPROVED
Revise the correction and resubmit before proceeding

RE

REVIEWED

For Information

Information acknowledged with no comment

RC

REVIEWED WITH COMMENT
Information acknowledged with comments

Note: Approval or comment does not relieve the Contractor of
all obligations covered under contract

Discipline: Civil
24 Apr 20
Date:

B

14-Apr-2020

For Information

J.H CHOI

K.S KIM

D.H Jeong

A

12-Mar-2020

For Information

J.H CHOI

K.S KIM

D.H Jeong

REV

DATE

DESCRIPTION

Approved

Checked

Prepared

OWNER

VAN PHONG POWER COMPANY LIMITED
PROJECT

Van Phong 1 BOT Thermal Power Plant Project
Status
□Approved
□Approved with Comment
□Not Approved
□Reviewed

OWNER’S ENGINEER
Pöyry Switzerland Ltd.
EPC CONTRACTORS

IHI–TESSC–CTCI–DHI CONSORTIUM

PROJECT DOCUMENT No

REV

VP1-0-L4-C-GEN-10018

B

DOCUMENT TITLE

METHOD STATEMENT FOR ESTABLISHMENT OF PERMANENT BENCHMARK SYSTEM
EPC

EPC DOCUMENT No.
VP1-0-L4-C-GEN-10018

Doosan Heavy Industries and Construction

REV
B


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

EPC
VP1-0-L4-C-GEN-10018

B

Doosan Heavy Industries and Construction

Table of Contents
1.
2.
3.
4.
5.
6.

PREFACE ----------------------------------------------------------------------------------------------------- 3
CODE ---------------------------------------------------------------------------------------------------------- 3
DATUM -------------------------------------------------------------------------------------------------------- 3

ORIGINAL DATA OF NATIONAL BENCHMARK ----------------------------------------------- 3
VOLUM OF WORK ---------------------------------------------------------------------------------------- 5
SURVEY EQUIPMENT AND MANPOWER. -------------------------------------------------------- 5
6.1. SURVEY EQUIPMENT . ------------------------------------------------------------------------------ 5
6.2. MANPOWER. ------------------------------------------------------------------------------------------- 6

7.

METHOD. ----------------------------------------------------------------------------------------------------- 6
7.1. BUILD PERMANENT BENCHMARK SYTEM. -------------------------------------------------- 6
7.2. HORIZOTAL CONTROL NETWORK. ----------------------------------------------------------- 10
7.3. VERTICAL CONTROL NETWORK. ------------------------------------------------------------- 11
7.4. STABILITY OF PERMANENT BENCHMARK SYSTEM. ----------------------------------- 11

8.

APENDIX. --------------------------------------------------------------------------------------------------8.1. SUPPLY SHEET OF NATIONAL BENCH MARK. --------------------------------------------------8.2. CERTIFICATE OF GPS EQUIPMENT. ----------------------------------------------------------8.3. CERTIFICATE OF TOTAL STATION AND LEVEL MACHINE. --------------------------8.4. CERTIFICATE OF MANPOWER------------------------------------------------------------------

2

13
13
15
16
20


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

1. PREFACE

-

Plant Project: Van Phong 1 Thermal Power Plant.

-

Company/Owner: VAN PHONG 1 POWER COMPANY LIMITED.

-

Consultant: PÖYRY SWITZERLAND LTD.

-

Contractor: IHI–TESSC–CTCI–DHI CONSORTIUM.

-

Ninh Hoa town is the coastal plain of South-Central Vietnam, in Khanh Hoa province,
located to the east of the North-South arc of the Truong Son range on the coordinates from
12020 '- 12045' North Latitude and from 105o52 '- 109o20' East. Van Phong 1 Coal Fire
Power Project (VP1). Which is project level 1 of National.

-

The purpose of this Method Statement (MS) is to describe establishment permanent
benchmark system for Construction progress and Settlement & Tilt monitoring works at VP1.

2. CODE
-

QCVN 04: 2009/BTNMT National technical regulation on establishment horizontal control network.

-

QCVN 11: 2008/BTNMT National technical regulation on establishment vertical control network.

-

Vietnamese standard No.: TCVN 9398:2012 Surveying in construction -General
requirements.

-

Vietnamese standard No.: TCVN 9401:2012 Technical of measuring and processing GPS data
in engineering survey.

-

Vietnamese standard No.: TCVN 9360:2012 Technical process of settlement monitoring of
civil and industrial building by geometrical levelling.

-

Vietnamese standard No.: QCVN 11:2008/BTNMT National technical regulation on
establishment of leveling network.

-

VP1-0-L4-C-GEN-00002_Topographic&Bathymetric Report (Rev C)

3. DATUM
-

Horizontal datum: VN-2000 coordinate system, 108°15’ central meridian, 0.9999 scale factor.

-

Vertical datum: Hon Dau – Hai Phong vertical datum.

4. ORIGINAL DATA OF NATIONAL BENCHMARK
-

Based on TCVN 9398:2012 The establishment permanent benchmark use Grade III for
horizontal control network and Grade I for vertical control network.

-

Original data: We will use 2 or 3 National Coordinate Benchmarks: 923428, 923430, 923445.
These are grade III and one National leveling benchmark is grade I.

-

The information details of these points (3nos) attached in the report of the appendix for this
MS to be described follow in tables below:

3

B

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

Table 1: Original data (National Bench Mark) for horizontal control network.
VN2000 ( 111°00, Zone 6°)
No

Name of points

1

VN2000 ( 118°15’, Zone 3°)

X

Y

X

Y

923428

1386102.775

303661.488

1386029.632

602488.263

2

923430

1384786.179

307751.989

1384755.740

606592.121

3

923445

1376694.670

313235.261

1376721.541

612159.090

Remark

Grade III

Table 2: Original data (National Bench Mark) for vertical control network.

Hon Dau – Hai Phong datum

No
1

Name of point
I (VL-HT)157

Remark

H (m)

28.836

I Grade I levelling

< Location of National Bench Marks on Google Map >

4


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

5. VOLUM OF WORK
-

Based on TCVN and the requirement at the site. The horizontal control network will be
established, which have 4 points in first time and by GPS, Total station method and 3 points more
in second time by Total station method.

-

The vertical control network will be established with 7 points by geometrical levelling method.

-

All permanent benchmark will be connected to National Benchmark (Vertical & Horizontal).

Table 3: Quantity for vertical control network at site.
No

Content

Unit

Quantity

Remark

1

The horizontal control network.

Point

7

Accuracy equivalent as Grade III
landmark network.

2

The vertical control network.

Point

7

Accuracy equivalent as Grade IV
levelling network.

6. SURVEY EQUIPMENT AND MANPOWER.
6.1. SURVEY EQUIPMENT .
-

Equipment will use to establishing horizontal and vertical control network, those will be satisfied
to technical and certificate.

-

The certificate – calibration – verification was attached in the appendix.

Table 4: Survey equipment.
No

Equipment

Quantity

Manufacture

1

GPS receiver L1 Trimble 4600LS

set

5

2

NA Leveling machine

set

1

3

Optical plummet

set

5

4

Sokia Total station 630RS

set

1

5

Computer and softwares

set

2

※ Certificates of Equipment are attached at Appendix 8.2

5

B


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

6.2.MANPOWER.
Table 5: List manpower for survey work.
No

Full name

Position

1

Ngo Van Nhuan

Chief survey engineer

2

Nguyen Ngoc Bang

Site survey engineer

3

Vu Duc Duong

Site survey engineer

4

Nguyen Van Sang

Worker

5

Ngo Quan Su

Worker

※ Certificates of Engineers are attached at Appendix 8.3

7. METHOD.
7.1.BUILDING PERMANENT BENCHMARK SYTEM.
-

Benchmark will be put on hard rock or on test pile. The stabilisation of these will be
guaranteed during construction time

-

Benchmarks are cocrete block with dimention 1,2m x 1,2m x 1.3m. These follow type 1 and
type 2 as drawing below:

6

B


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

7


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

Benchmark structure
-

Locations for benchmarks are as the drawing below, PBM-1 ~ PBM-4 follow type 1 and
PBM-5 ~ PBM-7 follow type 2.

8


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

Benchmark Location
9


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

7.2. HORIZOTAL CONTROL NETWORK.
-

The horizotal control network will be established by GPS method, 5 GPS equiment are set on
923428, 923430, 923445 and PBM-1 ~ PBM-4 within 2 hours to best receive signal from satellites.

-

The GPS’s result will be adjusted by software (Trimble Business Center) and checked again by
Total station method.

-

Accuracy of horizotal control network follow TCVN 9398 : 2012. The accuracy equivalent will be
as Grade III landmark network. The GPS’s result after adjustment will be used such basic data to set
up PBM-5 ~ PBM-7 by Total station method.

-

The diagram for checking GPS as below:

Diagram for checking GPS

10


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

-

Based on QCVN 04: 2009/BTNMT National technical regulation on establishment horizontal control
network. The technical regulation with Grade III as table below:
Table 6: Technical regulation of Grade III for Horizontal control network.
Technical regulation

Grade

Value

Position error maximum

7cm

Delta height error maximum

10cm
III

Relative length side error maximum

1/100,000
2.0’’

Azimuth error maximum

7.3. VERTICAL CONTROL NETWORK.
-

The vertical control network will be established by geometrical levelling method. The result will be
adjusted by software HHmaps or DP Survey.

-

Accuracy of horizotal control network follow TCVN 9398 : 2012. Thes Accuracy equivalent will
be Grade IV levelling network.

-

The diagram for measurement levelling as route :
Line 1: I(VL-HT)157
PBM-7
I(VL-HT)157

-

PBM-1

PBM-2

B
PBM-3

PBM-4

PBM-5

PBM-6

Based on QCVN 11: 2008/BTNMT National technical regulation on establishment vertical control
network. The technical regulation with Grade IV as table below:
Table 7: Technical regulation of Grade IV for Vertical control network.
Region

Grade

Closure Error of measuring

Remark

rings
20√L

Plain region
Mountainous region

L : total length in measuring
rings.(km)

IV

25√L

11


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

7.4. STABILITY OF PERMANENT BENMARK SYSTEM.
-

Stability of permanent benchmark system will be checked by every 6 months in construction process
and before each cycle for monitoring process until shut settlement.

-

Checking Benchmarks will be cross-check for each bench marks.

-

The horizontal displacement of them will be checked by Total station with measurement side & angu
lar.

-

The settlement will be checked by level machine. Based on the result (length side,angular and differe
nce heigh) to compared last cycle to review stability of PBM system.

12

B


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

8. APPENDIX.
8.1. SUPPLY SHEET OF NATIONAL BENCHMARK.
The Data of National benchmark is public ownership and to accuracy construction process be unified.
So the original data supply sheet in document No: VP1-0-L4-C-GEN00002_Topographic&Bathymetric Report (Rev.C) will be reuse other survey report.

13

B


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

14


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

8.2.CERTIFICATE OF GPS EQUIPMENT.

B

15


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

CERTIFICATE OF TOTAL STATION AND LEVEL MACHINE.

16


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

17


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

18


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

19


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

8.3.CERTIFICATE OF MANPOWER.
B

20


VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

21