Monday, April 7, 2008

Work method statement for Granite Floor and Wall

WORKS METHOD STATEMENT

FLOOR AND WALL COVERING





TABLE OF CONTENTS


1.0 WORK ORGANISATION
2.0 DESIGN CONSTRAINTS AND COORDINATION
3.0 CONTRACTING METHODS
4.0 PROCUREMENT METHODS
5.0 RESOURCE PROVISIONS
6.0 LOGISTICS PROVISIONS
7.0 MATERIAL MANAGEMENT SYSTEMS
8.0 CONSTRUCTION METHODS AND TECHNOLOGY
9.0 CONSTRUCTION PHASING AND WORKFLOW
10.0 TRAFFIC MANAGEMENT AND MONITORING
11.0 SAFETY PROGRAMME
12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES
13.0 INDUSTRIAL RELATIONS POLICIES
14.0 ENVIRONMENTAL MONITORING PROGRAMMES
15.0 APPENDICES


1.0 INTRODUCTION

This Work Method Statement is to ensure the floor and wall covering is carried out in a controlled and systematic manner that in all respect confirm to the specification.

2.0 DESIGN CONSTRAINTS AND COORDINATION

Not Applicable.

3.0 CONTRACTING METHODS

Since PCSB is liable for the performance of any Sub-contractor, it is vital that only companies with proven track records in the relevant activity will be engaged as Sub -contractors.

It is acknowledged that before any part of the works can be sublet, the approval of the Employer’s Representative is required.

The Conditions of Contract have been reviewed by PCSB and particularly those conditions in respect of Sub-contractors. The conditions are bespoke for this project and therefore be required to be reflected in any form of Sub-contract utilized on the project.

Please refer to PHOS-CN-010 to PHOS-CN-030 for the Contract Procedures.

4.0 PROCUREMENT METHODS

Please refer to PHOS-PR-010 to PHOS-PR-030 for the procurement procedures.
5.0 RESOURCE PROVISIONS

5.1 Manpower/Labour

The number of manpower/labour to be used during the activities have been identified in the Manpower Histogram.

5.2 Plant Equipment

Typical plant equipment to be used shall consist of:

~ Mechanical mixing
~ Brush
~ Roller or broom
~ Gauging water
~ Dowel pin




6.0 LOGISTICS PROVISIONS

Not Applicable

7.0 MATERIAL MANAGEMENT SYSTEMS

Please refer to PHOS-CP-040 for the Material Control Procedure.

8.0 CONSTRUCTION METHODS AND TECHNOLOGY

8.1 Handling Material

1. Temporary Storage Area

• Upon arrival of the crates at the temporary storage area, check the quantity of the crates and the crate number against the purchase order and the delivery order to ensure that the correct quantity and crate number are delivered to site
• Unload the crates to the specific area in the temporary storage area
• The crates shall be stored sector by sector for retrieval when they are required to be transported to the required area

2. Installation Location

• Forklifts are employed to transport the crates to a specific where the crates will be hoisted up to the respective floor where the granite are required for installation
• At the respective floor, the crates will be conveyed to the respective installation location where they are required for installation
• Open the crates and remove the crates for installation

8.2 Installation for Floor Finishes – Semi Dry Method

1. Surface Preparation

• The RC floor slab must be aged for at least 6 weeks (preferably longer) before the cement – sand screed is laid
• The RC surface must be dry, sound and free of contamination for example grease, dust, laitance, oil and etc which might impair adhesion between cement – sand screed and RC floor slab

2. Bonding Agent

• To ensure that cement – sand screed adheres securely onto the RC slab surface, a Bonding Agent is recommended to be applied at the interface of the screed and RC floor slab
• For the purpose, mix 1 part Belle Multi Bond, latex admixture to 1.5 part of Ordinary Portland Cement (OPC) by volume
• Mix until a thin slurry consistency is obtained. Mechanical mixing is recommended. Apply bond agent onto RC surface using brush, roller or broom at thickness not more than 1 mm.
• While the bonding agent is still wet or tacky, the cement sand mortar must be immediately placed over it for best bonding results.
• Where a screed is to be constructed as an unbounded screed at thickness of 50 mm or more, a bonding agent is unnecessary. For screed in excess of 50 mm reinforcement with steel fabric / wire mesh at its mid bed is recommended to prevent curling of the screed.


3. Granite Slab Setting Bed

• For installation of white colour 1200 x 600 x 25 mm granite slabs onto matured cement sand screed at internal floor areas, use Belcem Marblefix White, a white colour, water resistant, ultra thick bed, cement based adhesive complying to BS 5980:1980 (MS 1295:1992) fpor a type 1 class AA adhesive or ANSI A 118.1 :1992
• When fixing dense granite slabs or those treated with a water repellent impregnator, Belcem Marblefex must be incorporated with Belcem Admix plus, a latex admixture in replacement of gauging water
• Apply / spread adhesive onto substrate with a thick bed solid notched trowel at trowelled thickness of approximately 6 – 9 mm.
• For large format granite slabs, a thin coat of adhesive (approximately 3.0 mm) may need to be back buttered to the granite slabs back, before it is bedded onto the spread adhesive bed. This will ensure solid bed fixing granite back in full contact with adhesive bed.
• Press or knock granites firmly onto spread adhesive bed followed by slight sliding action to ensure good contact with adhesive bed, eliminate hollow areas or air voids and to adjust the finish level.
• Apply/spread adhesive to small areas at a time (approximately 1 m2 ) to avoid surface drying (skin over) of the adhesive.
• Allow granite slab installation to set for approx 24 – 48 hours before it is subjected to light footed traffic during grouting
• Mix ratio : 6 – 7 liters Belcem Admix Plus to 20 kg Belcem Granite Fix
• Open time : approximately 15 minutes depending on atmospheric condition
• Pot life : approximately 3 – 4 hours depending on atmospheric condition

8.3 Grouting / Pointing

8.3.1 Internal Dry Areas

• Granite joints should be grouted with Belcem Fine Grout, coloured, water resistant, cement based suitable for joints up to 3 mm wide
• When grouting to internal dry areas, mix grout with clean water only. Mix with a mechanical mixer until a uniform coloured, thin creamy consistency is obtained.

8.3.2 Internal Wet Areas

• Granite joints should be grouted with Belcem Fine Grout, coloured, water resistant, cement based suitable for joints up to 3 mm wide.
• When grouting to internal wet areas, mix grout with Belcem GT Mix I, a latex admixture in replacement of gauging water. Mix with a mechanical mixer until a uniform coloured, thin creamy consistency is obtained.
• Latex modified grout offers greater resistant to penetration of water, improved durability, flexural strength, compressive strength and adhesion to side of granites.
• Allocate joints of approximately 2mm wide between granite slabs.
• Apply grout with a rubber squeegee / float and ensure that joints are fully compacted with grouting material.
• Clean excess grout promptly using a damp cloth or sponge.
• Allow grout to set for at least 24 – 48 hours (preferably longer) before granite slab installation are subjected to normal service condition.
• Mix Ratio – 8 litres Belcem GT-Mix I (Clean water) : 20 kg (1 : 2.5)

8.3.3 Movement Joints

• Movement joints must be incorporated where necessary; complying to the requirements of BS 5385 : Part 1 : 1990 : Clause 20 & BS 5385 : Part 5 : 1990 : Clause 27.


8.4 Installation for Wall Granite – Toppin Bracket System

8.4.1 General Consideration

• Granite panels shall be installed about 100mm clear of wall.
• All fixing accessories such as brackets, extension plate shall be made of aluminium, washer, bolt, nut shall be made of stainless steel grade SUS 304.
• Where C-lipped channels to be used, it shall be hot-dipped galvanized (for sub-framing).
• All SHS shall be of mild steel and hot-dipped galvanized after fabrication.
• All welding works shall be of fillet weld. Welding works done on site will be dressed off welding spatters and coated over with galvanized paint.
8.4.2 Setting Out

• Setting out shall be carried out based on reference points provided by the main contractor.
• From these reference point, the reference level is transferred to the external surface of the column / wall by using a leveling instrument. The level for the fabricated truss shall be measured by using a measuring tape. A string is tied across the two extreme ends of the elevation at the marked level for the first elevation. The level for all intermediate columns / wall marked off the taut string. This is repeated for the other elevations.
• Similarly gridlines are set out based on the control points provided by the main contractor. The gridline is marked off from the control points onto columns/walls. The grid line on the last column/wall shall be tied back to the gridline provided by the main contractor. If the tie back does not tally with the measurement in the drawing the whole sequence is checked and repeated if necessary.
• After all the levels and grid lines have been marked on each column/wall, the position of the brackets including the hole position are marked using different colours, e.g. yellow or black for restrains brackets and red for dead-load brackets.
• Marked fabricated truss/channel position on column/wall.


8.4.3 Installation

• Drill holes into column / wall to accommodate fixing accessories, using :
1. Long SST plates or L brackets are welded on to the galvanized RHS frame exactly marked for the fixing of the granite panel.
2. Position of the Toppin Back Hole Bolts are marked exactly behind the granite panel to match the location of the long SST plates or L brackets welded on the hollow section frame. Using a special machine holes are drilled behind the granite panels at the exact position, approximately 20mm in depth.
3. The back bolt is fixed and tightened with nut and washer with extension plates. This predrill back bolt granite panels will be hoisted to exact locations of the welded L angle or plate.
4. During installation, the adjustable toppin system slot hole will accommodate any adjustment required about 20mm to suit site conditions.

• Using prefabricate truss / C-channel (where the design require sub-framing) – Only when necessary or site condition confirm.
1. Insert anchor bolt into holes drilled in the column / wall / beam / floor.
2. Mount prefabricated truss / vertical C-channel and tighten nut.
3. Check verticality and alignment of truss / channel.
4. Mount bracket / horizontal channel onto predrilled hole in truss/channel by means of bolt and nut with washer. To the predrilled hole in the free length of the bracket is inserted a dowel pin. Align the bracket with the dowel pin, embedded in Tenax glue, in the predrilled holes in the granite slabs.

• Apply approved sealant to the back and sides of the granite. Allow to dry.
• Each piece of stone is supported at the back by four toppin brackets bolted to SST plates or L angle welded to the hollow section frame.
• Ensure that the first (bottom) row of granite is aligned, leveled and properly fixed o the hollow section frame.
• The next row will be installed on top of the first row of slabs.
• Check verticality and alignment of each slab.
• Leave finished work square, regular, true to line, level and plane with a satisfactory at all junctions.
• Tape a sheet of 1000g polystyrene over granite and cover with plywood to a height of 1.2m for protection of the installed granite.


9.0 CONSTRUCTION PHASING AND WORKFLOW

Not Applicable

10.0 TRAFFIC MANAGEMENT AND MONITORING

The Logistic Manager and the traffic management contractor shall be responsible for the management and control of the traffic in and out from the construction site.

11.0 SAFETY PROGRAMME

Please refer to PHOS-HS-010 Health and Safety Plan.

12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES

Please refer to Appendix 15.1 for the Inspection and Test Plan and Appendix 15.2 for the Checklist.


13.0 INDUSTRIAL RELATIONS POLICIES

Not Applicable


14.0 ENVIRONMENTAL MONITORING PROGRAMMES

Please refer to PHOS-EMP-001 Environmental Management Plan


15.0 APPENDICES

15.1 Inspection and Test Plan

15.2 Inspection Checklist Form
15.3 Job Safety Analysis
15.4 Detail Drawing

1 comment:

viresh said...

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