Biện pháp thi công cửa nhôm kính dự án Feliz En Vista

b Aluminum Windows and Doors Installation: Aluminum products and components will first be transferred to the designated areas through site equipments such as tower crane, hoist, winch,

Employer : CapitaLand- Thien Duc Investment Co., Ltd.

REPLY:

Signed:

Approved with comments but works can proceed on site

This review is for conformance with the general design concept and for general arrangement expressed in the documents.  Review shall not be construed to mean that the reviewer accepts the  detail calculations and dimensions shown in the shop drawings or any deviation from the requirements of the contract documents.  Contractor is responsible for errors or omissions in the shop  drawings; for meeting all requirements of the contract documents; for confirming and correlating job site dimensions; for information that pertains solely to fabrication process or to techniques of  construction, and for the coordination of the work of all trades. It is understood that the notation on the submittal is not to be construed as an authorization for additional work or additional cost.

Date to Reply 17-Mar-19

We would like to submit Method statement of aluminium and glazing works Feliz En Vista project.

ENGINEERS (Vietnam) LTD

From: CSCEC32 Main Contractor

Attention Dang Thanh Sang; Le Dinh Luong Name:

 Normal (07 days) Critical (03 days)

RSP Reply 18 Mar 2019

Examined with comments, subject to site installation & test results (including field test) Resubmission is not required.

1-Please clear T&W for comments to Annex 3 Gondola if any

2-Comments in following page to be complied

This reply shall not relieve contractor from their responsibilities stated in the Contract

Le Dinh Luong

METHOD STATEMENT

OF ALUMINUM AND GLAZING WORKS

FELIZ EN VISTA PROJECT

CONTENTS

1 Introduction

2 General Procedure

3 Resources (Materials, Equipments & Human Resources)

4 Principle of Work Procedure

5 Method Statement

6 Quality control

7 Test Plan and check list for inspection

8 Site water testing

1 Introductions

This method statement relates to the installation work for Aluminum window & door frames and glazing

The project site is located in District 2, HCMC of Vietnam

We recognize that safety, health and environment (SHE) are primary premise in all decisions, being made for successful construction and shall comply with the relevant local authorities of Ho Chi Minh City, Socialist Republic of Vietnam

We will develop the construction method with the focus to avoid any harm to the health and safety

of owner's personnel, contractor employees and the public and also to minimize adverse effect to the natural and around environment

All necessary specifications, inspection and quality control will be complied with the contract documents, specification If there is any discrepancy in the descriptions below, it will be designated

by consultant/Client

SUMMARY OF WORK

The main scope of works are for Aluminum Windows and Doors installation

Aluminum extrusions for the project produced locally in Vietnam The extrusions are specifically designed by TACHENG METAL DOORS & WINDOWS CO., LTD for the specific project, and are processed and fabricated at Tacheng's factory in Long An

After processing, all frames are cleaned and protected with PVC tape They are packed into batches and then transport to site by trucks with various size

Tacheng Project Manager will be responsible to manage and supervise the installation at site, to ensure the workmanship, site safety, and installation progress

3 Resources ( Material – Equipment – Human Resource )

3.1 List of Materials

1 Fixing Screw Pan head

2 Fixing plug Galvazine steel

3 Anchor Plastic Plastic

4 Sika Latex Water Proof

5 Silicone Weather Sealant

Description Photo Units Remarks

3.3 Human Resource – Deployment of Manpower ( Tacheng )

6 Mr Phạm Minh Hùng Site Manager 0949 641 260 phamhung1712@gmail.com

7 Mr Lê Văn Ngọc Site Manager 0979 552 988 ngocth.info@gmail.com

9 Nguyễn Công Diện Site supervisor

10 Đinh Văn Ngọc Site Supervisor

11 Mr.Nguyễn Văn Thành Site Supervisor

12 Lê Hoàng Nhật Site supervisor

13 Bùi Thị Diễm My Site Secretary

4.1 Coordination at the Site

- Before starting the installation, it is necessary to prepare the site organization, delegating workers, and the required tools and utilities

- Communicating with Main contractor about site office preparation and permission for transporting overweighted equipments

- Find out the equipments and utilities that will be provided by the Main contractor (CSCEC 3)

at the site, such as hoist, tower crane, electricity, water, and etc

- Survey and understand the current progress of the main structure and the site regulations on safety, cleaning, fire prevention, and etc

- Make entry identification card for all technical officers, supervisors and workers working at site

- Communicating with the Main Contractor to find out the storage area at the site, and the storage size and condition for future inventory management at site

- Find out the transporting area at the site for product delivery, as well as the preferred delivery time

4.2 Site Work Execution

a) Site measurements and marking

Since the actual site dimensions might different from the approved shop drawings, Tacheng will perform the site measurement on each item before fabricating In case of any discrepancy, we shall coordinate with the Employer/Client and the Main Contractor (CSCEC3) to come out with a reasonable solution and must be informed to Architect for approval After confirmed with the Main Contractor (CSCEC3) and architect for the actual measurements on site, these figures will form the basis of the production dimensions

Equipment : Rolling Ruler - 50mm in length, Leveling ruler

Preparation : All technical documents of dimensions, measurements, and coordinates on site

b) Scaffold Usage:

Understand the safety requirements of the site scaffold, such as maximum load, allowed work, conditions, and etc Confirm with the Main Contractor (CSCEC3) with the dates that the scaffold will be installed and taken down Negotiate with the Main Contractor (CSCEC3) to finish all the scope of work that requires scaffolding before it is taken down

4 3 Installation progress

a) Before material delivery to Site

After being fabricated at the factory, the aluminum products will be transferred to the Q/A

department for quality control in areas such as finished dimension against the drawing, workmanship, color, damage, and etc After that, they will be wrapped with PVC tapes which will prevent surface scratch and minor damage The tape can be easily removed on site and will not remain on the surface even under high temperature to ensure that the surface of powder coating protected

b) Aluminum Windows and Doors Installation:

Aluminum products and components will first be transferred to the designated areas through site equipments such as tower crane, hoist, winch, and etc Installation process will be from floors to floors, depending on the schedule of the Main Contractor, Aluminum Frame Installation With the proper finish of its surrounding structure and the area handed over, frames will be installed on to the designated spot Experienced engineers will manage and check each connection of the frame into structure, and ensure the stability of the whole frame

c) Q/A of the Aluminum Frame

To set up plan and prepare documents for checking the installation of frames After finishing the installation of the frame, quality control department will check the technical requirements Any error will be fixed or replaced on the timely basis (See the chapter VI & VII)

4.4 Installation of glass and sashes

a) Material:

Must first confirm the type of glass that is used on the approved shop drawings The thickness, color, type, and characteristics Measurement: for glass that are fixed into frames or other anchoring devices, the actual measurements from the site is required For sashes, the engineers at the fabrication plant will calculate the dimensions that can be fitted into the sash

b) Technical requirement: Glass and sashes will be protected by PVC tapes and thick paper cushions

at the edges/corners during transportation and storage

Confirm the backer rod, gasket system, and sealant application with the approved shop drawings before proceeding

Make sure the direction of the glass is installed correctly (which side faces in or out) It might be necessary to signal marking on the glass to prevent accidentally walking on to glass

4.5 Anti- absorbency

a) Material: Sealants that are approved by the Architects to be applied to different areas for different functioning

b) Equipment

§ Sealant injection gun

§ Plastic knife with round side

The bite and the thickness of the sealants must be the same as stated in the shop drawings

Make sure the surface is dry and clean before applying, or use air compressor to blow out water and dust

Check if sealants are even out and the surface is smooth, if not then use the plastic knife to smooth out the surface

Clean with special detergent if sealants stain on other areas Remove all the covering tapes Cleaning before Hand Over to Main Contractor

When instructed, the sub-contractor will clean the work done before hand over to the Main Contractor The sub-contractor shall remove all the protection covers from the aluminum and glass, and then clean the surface If some stains remain on the surface, use specially designed chemicals

to gently remove the stain so that the surfaces will remain unharmed

5 Method Statement

5.1 Lifting Method

The storage of materials on site will be kept to an absolute minimum and there for delivery

scheduling will be carried out to ensure supply is on a "Just in time" basis only

Aluminum window frames Glass

5.2 Installation

Window installation involves the fixing of window installation of the window sashes This is a highly workmanship dependent process Only trained and approved contractors registered in Contractor Registry under the regulatory work head can carry out installation and retrofitting of windows

FINISH

START FINISH

START Living Room Casement

5.2.1 Installation of frame

After completion of all the wet trades around the window opening, the main frame is then fixed onto the concrete wall or brick wall by the fixing lug the center to center is 400 - 600mm along with the main frame Prior to fixing the main frame, should be checked for any physical damages

The opening structure frame should be cleaned and clear of dust and

debris Dust and debris accumulated in the open structure and the frame

could affect the alignment and fixing of the main frame It may also cause

blockage to the weep holes, resulting in overflow of incidental water into

the interior

The installation of main frame should be carried out only by trained and approved contractors

registered in Contractor Registry under work head as shown in Figure 1

a) Fitting the main frame onto open structure b) Fitting the finishing trim Millet should be used

to knock the finishing trim in place

Figure 1 : Installation of main frame

5.2.2 Fixing Lug system (Installation of frame on brick wall)

Before installation of the window frame, the following Wall opening should be hacked for any physical defects Any defects should be rectified before installation proceeds; Wall opening should be cleaned and wetted as shown in Figure 2

Window frame should be checked for any damages, and should come with the correct number / spacing

of galvanized straps (Figure 3) Defective frames should be replaced

Figure 2: Clean and wet the wall surface

Figure 3: Check the number dimensions, and spacing of galvanized straps around the opening

Figure 4: Check dimension for plastic impact anchor

Timber V-shaped wedges are commonly used to alignment (Figure 5) Tolerances that are stated in temporarily hold the window frame in position within the wall opening as shown in (Figure 5.1) The window frame Frame is then checked for plumb, levelness alignment (Figure 6) Tolerances that are stated

in Table 1.2 should be followed window frame

Figure 5: Use of V-shaped timber wedges for positioning of frame

Figure 5.1: Gap between wall and aluminum frame

GAP BETWEEN CONCRETE WALL AND ALUMINUM FRAME (MORTAR)

GAP BETWEEN CONCRETE WALL AND ALUMINUM FRAME (MORTAR)

Table 1.2 Tolerances for installation Window frame

Figure 6: Checking the plumb, levelness and alignment of window frame

After confirming the position of the frame, the galvanized straps are installed to the wall When install the straps, the plumb line should be maintained to ensure proper alignment of the frame The levellness and squareness of the installed frame can be checked by carrying out a diagonal dimensional check as shown in Figure 7

Check plumb of frame Check alignment of frame Check alignment of frame Check positioning of frame

a) Install the straps to the wall after

confirming the positioning of the frame

b) Check diagonal dimensions after

installation

Figure 7: Fixing of window frame

• Installation of frame on precast and cast-in situ RC walls

The fixing plate system can also be used on precast and cast-in situ RC walls which are finished with skim coat The fixing plate system fix to the RC by impact plastic screw M5x30 mm In such cases, recesses of 20mm deep (as shown in Figure 8) should be provided to accommodate the installation of the straps/brackets These recesses should be provided during the casting of the RC walls and in accordance with the specified spacing of the straps / brackets

Another method for fixing the frame to skim-coated precast or in-situ RC wall is to anchor the frame

to the concrete wall A bottom frame is installed on the bottom edge of the wall opening Proper alignment and levellness must be verified before sealant is used to seal the gap between the wall and the bottom frame to ensure water tightness at this location

The window main frame is then held in place with in the wall opening using timber wedges, and checked for alignment, plumb and squareness Next, the frame is fixed to the wall using anchors

of adequate size and length required to support the size and weight of the window system

Figure 8: Recesses formed in RC wall to accommodate the straps/bracket

The gaps between the window frame and wall must be properly sealed to

prevent water see page at these locations Depending on the size of the gap, waterproof grouting or sealant can be used

 Application of Weather Sealant

Sealant could be used to seal the gap between wall and window frame if the gap size is between 10mm

7-Before the application of sealant, clean the aluminum window

frame with white spiritusing a clean rag

The frame and wall surfaces around the gap should be protected

with masking tape to prevent the sealant from staining these

surfaces and to obtain a neat

Backerod should be used to achive better compactness of the

applied sealant

To obtain a complete seal, apply sealant by pushing the bead

forward

into the joint cavity

The joint should have continuous caulking to ensure that all areas

are filled

Remove the excess sealant and tool the joint to achieve a smooth

surface

• Grouting (using cement)

Gap between 11-25mm could be sealed by grouting Before commencing the grouting work, it is important to check that the protective tape on the window frame is intact Any damaged or loose

Figure 10: Application of sealant

protective tape must be replaced to prevent staining to the frame

Wall surface to receive the grout should be

cleaned with water to remove any dust and loose

particles and to minimize water absorption from

the grout by the masonry wall Non-shrink grout

should be used to prevent cracks and water

seepage around the window

For better performance, the mortar mix ratio

should be 1 part of water to 3 parts of mortar and

add the admixture sika latex

Approved waterproofing compound could be

added to the mortar mix to enhance the

watertightness performance of the grout

Water proof cement grouting should be used to prevent cracks and water seepage around the window For better performance, the mortar mix ratio should be 1 part of water to 3 parts of mortar and add the admixture Sika Latex Approved waterproofing compound could be added to the mortar mix to enhance the watertightness performance of the grout

Timber strip could be used to provide a firm backing during grouting to enhance compactness

of the grout as shown in Figure 12

a) Mortar mixed with water proofing compound b) Use of suitable grouting gun

c) Use of timber strip as backing d) Tooling the grout to give a neat surface

Figure 12 : For effective grouting, a suitable grouting gun should be used

Allow the grouting to cure for 2-3 days, and visual check for any defect such as cracks and voids Any defect should be rectified before proceeding to the next stage of work

Figure 11: Clean surface to get rid of dust and particles

It is recommended that glazing work for inner glass panels be carried out in the factory, where higher work quality can be achieved Where this is not possible, glazing work must be carried out

on site with proper handling and good workmanship

For fixed glass panels, glazing is usually done on site This section will discuss the good practices

to be adopted when carrying out glazing works on site

a Preparatory works before glazing

The protective tapes should only be removed when glazing works is to be carried out

The following verification works should be carried out prior to glazing work:

Window

frame

• Inner frame and associated hardware should be checked for defects Damaged frames or hardware should be replaced

• Inner frame should be cleaned and free from dust and debris

• Weep holes in the inner frames should be cleared of blockage to allow discharge of incidental water

b Glazing of glass to inner

There are generally two installation arrangements of casement and top hung/ bottom hung windows

Glazing can be carried out either before or after the inner frame is installed onto the main frame The glazing process is similar for both arrangements

However, extra care should be exercised when carrying out glazing work on inner frame

which has already been fixed onto the outer frame, with emphasis placed on safety of the workers

Glass

Panel

• Compliance with physical specifications such as dimensions of panel

• Labels on the glass panels should be checked against the window schedule

• For Heat strengthen/tempered/

laminated glass, check for the associated logo / trade mark/ label

• The orientation of the glass panels should be standardised such that the positioning of these

Gasket

• Gasket should be checked for any physical damages Defective gasket should not be used

• Gasket should be free from dust and dirt to ensure good grip onto the frame and beadings

• Profile of the gaskets should be compatible with that of the beads used to secure the glass panels

are normally used to temporarily hold the glass panel in place

a) Inserting glass panel onto the window frame b) Spacer blocks to hold the glass panel in place

Figure 13 : Glazing of glass into the inner

Gasket used should be of a continuous length, and between the glass panel and the inner frame to obtain a good fitting to hold the glass panel in place and to prevenet water seepage (figure 14)

a) Estimate the length of the gasket required b) Splice the gasket to fit the corners of the glass

Figure 14 : Installation of gasket

The glass panel is then secured in position using

aluminum beads The profile of the beads should be

verified for compatibility with the gasket used Millet

or the back of rubberized screwdriver can be used to

knock the beadings in place Poorly fitted beading will

result in gaps and misalignment of joints

c)Tooling the gasket in place

a) For glazing before installation of inner panel b) For glazing after the installation of inner panel

Figure 15: Securing the glass panel with beadings

After the installation of beadings, the gap between the accordance with the specifications The frame and glass should be protected with masking tapes prior to sealant application A simple tool as shown in Figure 16 can be used to give a neat finish The masking tape should only be removed after the sealant is dry

Figure 16: Application of sealant

5.2.5 Installation of window inner frame

a Casement / top hung windows

The inner frame of casement window is fixed to the main frame using friction stays

The friction stays should be fixed using adequate number of stainless steel screws or rivets of

surfficient size, depending on the size and weight of the inner frame For better watertightness, seal heads