Method of Statement for Block Works

11:31 PM Block , MS 6 Comments

TABLE OF CONTENTS 

1.0 Objectives
2.0 Scope
3.0 Reference
4.0 Abbreviations
5.0 Health and Safety
6.0 Equipments
7.0 Responsibilities/Supervision
8.0 Work Methodology
9.0 Quality Control




 1.0 OBJECTIVES 
 This is to define the requirements for supply and laying of concrete blockwork of QAAW under QF in accordance with contract specification, and maintaining the highest accuracy of the works in a safe and proper manner.

 2.0 SCOPE 
 All activities that involves blockwork material installation.

 3.0 REFERENCE
• Project Specification
• Qatar General Organization for Standards and Metrology
• QCS2010
• Workmanship under BS EN 1996 and BS 8000:part3

 4.0 ABBREVIATIONS
• QA = Quality Assurance
• QC = Quality Control
• MS = Method of Statement

 5.0 HEALTH & SAFETY
 • All blockworks activities shall be monitored by Safety Officer.
 • A scaffold spanning the work area is constructed up to the level of the construction.
 • The scaffold shall be designed to hold the material that is to be used in the block wall construction.
 • All workers working at height shall have to wear safety harness.
 • The area where the blockwork activities are in progress shall be barricaded.
 • Strict tool box shall be conducted in order to disclose the danger in this area.
 • Personal Protective Equipment’s (PPE) shall be used at all the times.

 6.0 EQUIPMENTS
 • Trowel
• Mason’s Hammer
• Blocking chisel
• Mashing hammer
• Masonry power saw
• Level bar
• Mason’s line
• Steel square
• Brushes
• shovels
• Powered mortar mixer

 7.0 RESPONSIBILITIES/SUPERVISION
5.1 Project Manager
 • Overall responsible for the implementation of this Method Statement.
• Ensure the works are carried out according to the planned program and the equipment’s are available and in good condition as per the project planning.
• Co-ordinate with the Consultant, Site Engineer, Safety Engineer and sub-contractor for the safe and proper execution of the work.
• Stress on safety measures and quality control in coordination with safety and QC engineers and follow the HSE & Quality plan.
• Make sure that the necessary tests and inspections are carried out as required by the project’s specification.
 5.2 Quality Engineer 
• Ensure all works are carried out as per specification and related quality procedures.
• Arrange site inspection from the site engineer and chase the consultant for approval.
• Keep record of the inspections and test for any future reference.
 5.3 Site Engineer 
• Ensure blockworks shall be carried out according to specifications and approved drawings.
• Provide all necessary information and distribute the responsibilities to his construction team.
• Ensure that the work progress is in line with the program of works and report to the Project Manager.
• Ensure that all safety precautions are in place and that all personnel on site are using the required PPE.
• Ensure all relevant permission is available for the works.
• Monitor and check all subcontractor works, ensure they are complying as per specification, quality procedures and approved drawing.
 5.4 Foreman 
• Carrying out the work and the proper distribution of all the available resources in co-ordination with the site engineer on a daily basis.
• Issue the daily report and coordinate with the site engineer to stay in line with the program of work.
• Co-ordinate with the surveyor for the benchmarks, setting out and the markings.
• Deal with any type of unforeseen incidents and report to the site engineer immediately.
 5.5 Site Safety Officer
• Ensure that the implementation of all safety measures is in line with the HSE plan and that everybody is aware of those measures.
• Train the people to prevent accidents and issue a safety report to the Project Manager.
• Ensure that the site is maintained clean and tidy.

8.0 WORK METHODOLOGY
 8.1 Documentation
• Ensure that all materials, sample, masonry accessories and method of statement are approved prior to execution on site.
• Prior to execution of works, an execution clearance shall be obtained from MEP for proper coordination regarding cut out.
8.2 Material Specification: 
      8.2.1 Blocks 
• All masonry standards shall be in accordance with BS EN 771-3 and BS 6073-2.
• The average compressive strength of 10 sample blocks shall be in accordance with project specification pages 042200/4 to 042200/05 as specified.
• All surfaces shall be flat and rectangular and adjacent surfaces shall be at right angles to one another.
      8.2.2 Mortar 
• Mortar mix proportion shall be cement, lime and sand to BS EN 1996.
 • Portland cement shall be in accordance to BS EN 197:Part 1.
• Lime shall be in accordance to BS EN 459:Part 1.
• Sand shall comply with BS EN 13139 and PD 6682:Part 3.
• All accessories and sundries shall be in accordance with project specification pages 042200/10 to 042200/12 as specified.
      8.2.3 Wall Ties 
• This shall be stainless steel grade 1.4301 8.2.4 Lintels
• Shall be a suitable precast concrete lintel in accordance with project specification and BS 5977:Part1 and BS EN 845:Part2.
      8.2.5 Wind post 
• Shall be stainless steel grade 1.4301 to BS EN 10088.
      8.2.6 Movement Joint 
• Shall be a suitable sealant including primer and backing strips.
• Colour shall be agreed with the Engnieer to match the finishes.
      8.2.7 Damp-proof Courses (DPC)
• Shall be a suitable DPC in either polyethylene to BS 6515 or polymetric material to BS 6398.
• DPC shall be laid on a continuous mortar bed even and free from projections liable to cause damage.
• The joint of DPC shall be lapped a minimum of 100 mm at all passing and sealed.
8.3 Installation 
• Clean the area on which the blocks shall be installed.
• Surveyor shall mark out the layout for the blockwork with reference to approved drawings.
• The first layer of the blocks shall be fully set out with proper alignment.
• All block shall be thoroughly wetted with water before they are laid and tops of walls left from previous day work shall be similarly wetted before the new work commences.
• Blocks shall be properly laid on a full bed of mortar. Mortar joint thickness shall be approximately 5 mm thick maximum as specified in QCS 2010 Section 13, Part 2 clause 2.7.4.2
• Mortar made on site shall be preferably be mixed by powered mortar mixer.
• Blockwork laying shall be level and true to line. Accurately plumb all wall faces, angles and features.
• Cutting of blocks shall be done by power driven masonry saw.
• The work shall be carried out course by course. No portion of the work shall be raised by more than 1200 mm above another at any time. One leaf of the wall shall not be built more than 1500 mm in one day as specified in project specification pages 042200/14.
• Blockwork more than 6 m height shall be reinforced with reinforced concrete stiffening frame work comprising of 200 x 200 mm verticals at 4 m center and 200 x 300 mm horizontal at mid-height or at every 3 m in case the wall height is higher than 5 m.
• Stiffener columns and beams shall be provided according to the approved drawings and shall be inspected and approved before any casting. • All joint shall be solidly filled and plumb every 900 mm.
• All connection shall be made using stainless steel ties embedded in the concrete in a horizontal mortar joints at vertical spacing of 600 mm. • Installed blockwork shall be cured for 3 days.
• Clean exposed surfaces of dirt, stains, mortar splashes and other blemishes.

 9.0 QUALITY CONTROL
9.1 Checklist 
• Vertical & horizontal alignment.
• Accessories
• Stiffener frame
• Cleaning 9.2 Inspection
• Every completed works shall be inspected and approved by the Engineers prior to proceed on the next activity. 9.3 Testing
• Every batch of block materials delivered shall be subject for test at certified UKAS testing laboratory in accordance with BS EN 1052.
• Mortar used shall be subject to testing in accordance with BS EN 1996, BS 4551 and BS EN 1015.