Biện pháp thi công nhà xưởng tiền chế tiếng anh

Biện pháp thi công nhà xưởng tiền chế tiếng anh estimated to be suitable for progress and construction plan in each period In this work contractor focuses on concerning about things for high quality and artic construction work _ Equipment: Contractor ... concrete with the same thickness as protected concrete and grade as one of structure concrete Preliminary acceptance for reinforcement Drill

B 23.05.2019 N.N.Chinh W.I.KWAK J.T.SEO REVISE AS PER OWNER COMMENT

A 24.04.2019 N.N.Chinh W.I.KWAK J.T.SEO FOR APPROVAL

Rev Date Prepared Checked Approved Details of Revision

RECORD OF REVISION

7 MANPOWER MOBILIZATION & EQUIPMENT MOBILIZATION PLAN 6

10 DETAILED ERECTION PLAN FOR TBN STEEL STRUCTURE 27

1 INTRODUCTION

This method statement describes the procedure and sequence of activities to be carried out during the turbine building steel structure erection in order to ensure that the work is planned and performed in accordance with the contract and designer’s recommendation at Nghi Son 2 Coal Fired Thermal Power Plant This document is prepared based upon the Project Specification, EPC Contractor’s Technical Specification This document only applies for Nghi Son 2 thermal power plant project

This method statement will be applied to the Turbine building steel structure erection and other steel building of Nghi Son 2 Coal Fired Thermal Power Plant 2x600 MW to ensure compliance with approved drawings, project technical specification and procedures

The erection scope of work and estimated quantity of each work are as below:

- CONTRACTOR: Doosan Heavy Industries Vietnam

- SUBCONTRACTOR: ATAD Steel Structure Corporation

- QA/QC: Quality Assurance and Quality Control

- HSSE: Health Safety Security and Environment

- JSA: Job Safety Analysis

- NDT: Non-Destructive Testing

- AISC: American Institute of Steel Construction

- Issued Drawings: NS2-VN03-P0UMA-170361 ~170379; NS2-VV07-POZEN-170108 ~170109

- Approved Site Quality Control Procedure, Document no NS2-CH04-P0ZEN-040001

- Project EHSS Management Plan

- Painting Procedure, Document no NS2-YR01-P0ZEN-070001

- ANSI/AISC 360: Specifications for the Design, Fabrication and Erection of Structural Steel for Buildings

- AISC 303: Code of Standard Practice for Steel Buildings & Bridges

- Specification for Structural Joints using ASTM A325 or A490 Bolts

- ASTM A36/A36M: Standard Specification for Carbon Structural Steel

Unit Quantity Remark Zone #1 Ton 768

Zone #2 Ton 768 Zone #3 Ton 1286 Zone #4 Ton 768 Zone #5 Ton 1854

Ton 3348 M2 13493 M2 7180

M 4496 Ton 267 M3 67,2

Steel grating Steel pipe handrail High strength bolts/nut/washer non - shrinkage grout for structural steel column

Description

Unit 1

Unit 2 Other Main Structure

Meta decking including stud bolt, end plate and accessory

- ASTM A6/A6M: Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

- ASTM A325M: Standard Specification for High strength bolts for structural steel joints,

including suitable nuts and plain hardened washers

- The welding procedure specification (WPS) shall be qualified in accordance with standard

AWS D1.1

5.1 Site Organization Chart

5.2 RESPONSIBILITIES

5.2.1 Project Manager:

Project Manager will be responsible of the entire activities on the site including preparation,

maintaining and monitoring of construction progress Project manager will also are responsible for ensuring that all construction activities are performed in conformity with environmental protection standard as well as best safety and quality as requirement in contractual document and specification Manage of all respective construction works include equipment and manpower mobilization plan, construction progress, method statement, QA/QC plan, HSE plan, etc…

5.2.2 Construction Manager:

Construction Manager will report directly to the Project manager He is responsible for organization, supervision and control of construction team and all aspect of the construction works to ensure the works to be performed safety, quality and timely manner

5.2.3 Planning Manager:

Planning Manager will be responsibility to perform all the reports following project requirement such

as daily report, weekly report, and monthly report To monitor and control construction schedule assist Project manager for supervising the schedule Prepare all the construction progress report and submit for Contractor approval

5.2.4 Material control manager:

Material control manager will be responsibility to monitor and control all materials received hand over

by Contractor Supervise and update the status of delivery material at the site, laydown material and coordinate with QA/QC team to control quality the fabrication cargo

5.2.5 QA/QC manager:

The quality control manager will be responsible for ensuring that these activities complied in accordance with the relevant standard procedures and designer’s recommendations Quality control engineer shall also responsible for the documentation and inspection in accordance with the QA/QC Manual and specification

5.2.6 QC Supervisors

QC Supervisors are responsible to directly observe/ control the quality of each working team Instruct

to construction team about technical requirement, perform internal checking and report to QA/QC manager for final inspection

QC Supervisors to provide the requests for inspection (RFI) of work, and attend the inspection at site and prepare all the QA/QC reports submit to Contractor

QC team also has responsibility to check dimension, quality, quantity the fabrication cargo when Contractor’s supplier material delivery to site

5.2.7 HSSE Manager/ Officer

HSSE Manager will take responsibility of all ESSH (Environment Safety Security and Health) activities at the site

HSSE Manager will report directly to Project manager His responsibilities include organize, supervise and control HSSE team and all aspect of HSSE during performing construction works HSSE manager and his staffs shall coordinate with construction team to ensure that all Subcontractor’s activities are complied with Contractor’s HSSE regulations

5.2.8 Superintendent

Superintendent will report directly to Construction manager and to be responsibility to supervise closely the erection activities at the site in accordance with method statement and project specification and ensures that the all instructions are followed prior to commencement the erection works

5.2.9 Survey team

Survey leader will be responsible for checking location of anchor bolt before start erection to make sure accuracy of setting out foundation and tolerance of steel structure erection work

Survey leader shall take responsibility all survey works at the site and report to QA/QC manager for monitoring and controlling erection/ installation quality

5.2.10 Document controller

Monitor and control all documentations of project, manage all correspondences from Contractor to Subcontractor, to be responsible all submission of documents to Contractor

Note: The schedule could be revised by the condition at site

 MANPOWER MOBILIZATION PLAN

Note: The schedule could be revised by the condition at site

 EQUIPMENT MOBILIZATION PLAN

Note: The schedule could be revised by the condition at site

8.1 Erection Plan

- The erection process start from the turbine Unit#1 after that to be continued such as overall schedule

(Refer to following an illustration of Steel Structure Work sequence)

■ Road Map around TBN

8.2 Erection Sequence

8.3 Unloading plan

8.3.1 Lay-down area Map

Receive material at laydown Delivery material to site

Erection beam, bracing tier #1

Erection column tier #1

Foundation check Chipping, Padding Works

Plumpness, Alignment Tightening bolts

Erection column tier #2

Erection beam, bracing tier

#2

Plumpness, Alignment Tightening bolts

Grouting works Assembly & Erection truss

& Tightening bolts Installation Purlin & Girth

- The materials when unloaded at site will arrange following laydown map step by step for each construction zone

8.3.2 Receive material at laydown and delivery material to site

 The material will issue by Contractor, Subcontractor will receive materials at laydown area,

Subcontractor’s QC will fully inspect when unloading material at Subcontractor’s laydown area, if material have any-damaged then QC shall be issued the report to Contractor

 The steel structure shall be stored clear of the ground on frame of A type or wood Bolts,

nuts, washers and other small loosen items shall be packed in boxes Plates and sections edge prepared for field welding shall be protected

 All bolts, nuts, washers and clips shall be delivered with the first lot of structural steel in

order to enable erection work can execute after first shipment Field connection material as bolts (screws, nuts, washer, tension indicator washers, etc.) and connection accessories as

shims and electrodes shall be furnished with a surplus of at least 5% quantity over

requirement

 Materials should be segregated and stored at storage yard for easy handling as per

erection sequence Main members such as columns, girders and vertical bracings shall be stored in easy access area and sub-members such as beams, bracing, ladders, and platforms shall be stored separately Materials will be arranged following material laydown map

a Arrangement material at laydown

b Unloading material at site

Note: Good unloading will be designated at site

 Proper and adequate instruction will be given to the worker to avoid any damage to steel

structure paint while loading and unloading and proper tools and construction equipment shall

be used If there is any damage, it will be repaired with the proper methods

 In order to avoid any damaged to steel paint, we consider to use the plastic or rubber sheet to

cover the lifting cable while handling For light member, we are considering the sling for this purpose The size of rope will be calculated based on manufacture’s instruction and test result thereon

 All the materials shall be placed at site on supporting wood or frame of A type not to

contacting with ground

 Small material such as connection plates, bolt and grating fastener shall be stored indoor and

arranged by sizing

8.4 Chipping and padding work

The foundation shall be obtained hand-over and take-over with DVN and involved contractor, the state of foundation shall be verified and improved, if required after inspection

sub-Where any concrete laitance, dirty, debris and any foreign materials are found, they must be properly cleaned before hand over Adequate instrument and tools with adequate accuracy will be used for checking of the related foundations such as Survey instrument, Tape measure, Corner gauge, Level gauge and etc

If damaged anchor bolts are founded such as bend, which was occurred during construction period, they will be properly repaired and maintain as per following sequence with the confirmation of the Contractor The specified method to repair them will be submitted to Contractor for review and approval before repairing woks commencement, if required

Repair works shall be performed as follow:

 Repair damaged thread of anchor bolt by thread tools

 Excavating concrete around the damaged anchor bolt to adequate depth

 Protect thread bar and cold bending the damaged anchor bolt to accuracy position by chain

block or other manner

 Filling grout around the repaired anchor rods

 Re-Inspection and etc

 The foundation surface that required to applying of grout shall be chipped out to make sure

minimum requirement of clearance and roughness Top surfaces of foundation shall be chipped to enable bonding of grout and concrete unless otherwise the grouting on them are unnecessary We are using the Electric hammer or manual to chipping foundation’s top surfaces After chipped, we clean them by brush and air compressor if required

 Before column erection, final checking of foundation shall be carried out to get the accuracy

of coordinate, elevation, cleaning, shear keys hole, etc

 Packer shall be as temporary support the steel structure until the grouting shall be carried out

They should be performed at correct elevation as per approved drawing

Chipping of foundation to required level if any out from tolerance

Cleaning of chipping surface free from foreign particles and grease

Pre- soak the area to be grouted

Prepare and mix padding mortar with water asper the padding mortar Manufacturer’s instruction

Set the packer plate to the required level by using the auto level and spirit level

To maintain the curing time

 Mortar should be hard-kneaded with proper quality water; packer shall be cured by water for

prevention of crack caused by rapid dryness Prior to install columns, top of elevation of packer shall be confirmed and the mortal shall be applied The packer plate (thickness 10-20mm, Size 150x100, the packer plate size can be changed accordingly site condition) would be installed with 45-degree slope of padding

Protection of anchor bolt during heavy equipment access and operating

 Using temporary pipe to cover and protection of anchor bolt

 Provide steel plate for crawler crane during moving and lifting

See sketch below:

8.5 Erection for column,beam,bracing

- Cleaning surface structure, hanging temporary cable in steel column

- Lift column (prepare protection to the end of column to avoid slip of column)

- After sitting column to avoid falling of column, set guy wire 14mm with Lever Block 1.5 tons and adjusting Lever Block for vertical alignment of columns → Set shim plate on each padding plate for keeping level → Release lifting wire sling

- The anchoring points are clamps with thread rods M24 connect to beside pedestal

- Erection column, beam, bracing follow numbering in below map

Pipe plastic

 After erection all column, beam, girder in each tier including roof truss, the lifeline and safety

met will be installed

The picture for reference

8.6 Plumpness and Alignment

 After all of main beams have been installed to position, alignment and vertically of structural

steel is carried out

 Alignment of steel structure shall be performed one by one of installed tier The tier #1 shall be

aligned before installing tier #2

 Structure base plates elevation shall be checked to ensure no damaged of padding plates and

the tolerance of elevation is acceptable If the padding elevation is less than design level, a shims plate will be used to compensate the minus elevation

 If alignment data are confirmed to be within tolerance limit, the bolts shall be tightened

 After completing main girder erection, continue sub-beam erection will be performed

 We are using the steel cables with chain block to pulling and kept the structure columns in

vertical direction The pulling cables may anchor to other foundations if it is applicable

 We are using the hydraulic jack to set the columns base plates into their designated positions

and elevation and vertical direction The manner shall be properly performed without any damage to the steel structure

 We are using the surveying equipment such as theodolite, level, and tape to check or inspect

the installation tolerance

The position and vertical tolerance, please refer to AISC 303-10, item 7.13

North, South, West, East direction shall be checked

8.7 Assembly by bolting

8.7.1 General method

- We use the electric tool or air pressure tool which preset-type torque to tighten the bolts if applicable

- Proper tightening device shall be used and checked before starting work

- Tightening TS Bolts follow sequence:

8.7.2 Other method to tighten the bolts

Based on AISC, high strength bolt may be tightened by snug tightening method following, this

case can be applied to the corner positions that the bolt fastener cannot be used:

(1) Snug tightening (Hand tightening)

(2) Mark straight line from bolt center to nut as shown below

(3) Tightening by device to make proper torque value

8.7.3 Structure Movement Protection During Bolt Tightening:

To protect any movement steel structure during bolt tightening, we carry out work following steps

below:

1) Do not move or remove the anchoring cables or chain block while tightening,

2) Perform bolt tighten at both sides of connection beam, girder, bracing…together

3) Keep the sequence of bolt tightening

4) Plumbing and horizontal will be monitored during bolt tightening by survey instruments

(follow standard AISC 303-10, item 7.13)

5) Well trainned worker about bolt tightening and safety

6) Related major structure shall be installed

7) If required, temporary brace will be placed

8.7.4 Tightening of Anchor Bolt:

The majority of anchorage applications in buildings do not require pretension in the anchor rod However the anchor rod can be snug-tightened during alignment the steel structure After grouting and curing period, the anchor bolt shall tighten

Tightening Inspection:

- After bolts have tightened, the vertical tolerance of structure will be re-checked before bolt tightening inspection

8.8 Grouting for erected steel structure

- After Tier #2 structure has aligned, T.S Bolt tightened, and Anchor bolt have snug-tightened, (including weld if required), grouting work is performing under the base plate of columns by non-shrink grout to provide sufficient bearing capacity of structure columns

- Grouting material will be submitted to contractor for approval prior to grouting work

- Clean the foundation surface against by brush and air compressor to remove any soils, rubbish and dust Oil or grease shall be cleaned by solvent or thinner;

- We use the tools to mix grouting and mixing grout in accordance with grout manufacturer’s instruction

- Pouring non-shrink grout in the form Pouring grout via the grout holes on base plates which provided by Fabricator

- Maintain pouring at one position to prevent air spot under the base plate

- Curing grout in accordance with grout manufacturer’s recommendation

- Sampling and testing on grout according to manufacturer’s recommendation

- After finishing curing, anchor bolt & nut shall be tightened

Steel sheet 500x100x5mm

can be instead by wood sheet

with same dimention as steel sheet

Angle 75X75X5, L=600mm Lock nut

Bolt bar M16, L=570mm

Fabricated angle L17x17x3

THE GROUND FLOOR