243-Method Statement for Block WOrksrev1

Project Logo Project Name : VILLA (B+G+2F) BVS-43, AT THE PEARL QATARProject No. : 243 Form No.: P07-F06 / Rev. 0 / Nov. 2012Client Consultant Contractor Subcontractor

MR. SALAH MOHAMED JAIDAH

METHOD STATEMENT FOR BLOCK WORKS.

METHOD STATEMENT No: MTS-C-003 REV : 0

ORIGINATOR : AMTC DISCIPLINE: CIVIL

Title :Method Statement for Block Works.

REV DATE STATUS REVISION DETAILSREVIEWER / APPROVER

SubCon

Main Con EXTERNAL

0 05-Feb-15 FA FOR REVIEW & APPROVAL NW

Status Code:D : Draft FI : For Information FC : For Construction

P : Preliminary FA : For Approval * External Authorization (Client), where required

Distribution :

Method Statement for Blockworks. Form No. P07-F06 / Rev. 0 / Nov. 2012AEB-CSD Quality Forms Page 1 of 10

Project Logo Project Name : VILLA (B+G+2F) BVS-43, AT THE PEARL QATARProject No. : 243 Location: PEARL QATARClient Consultant Contractor Subcontractor


Table of Contents

1. Scope /Objectives

2. Reference

3. Access/Egress

4. Logistics

5. Health and Safety Hazards

6. Definitions

7. Responsibilities / Supervision

8. Procedures /Method to be Employed

9. Training

10. Working hours

11. House keeping

12. Manpower Requirement & Supervision

13. Material Requirement

14. Plant & Equipment Requirement

15. Q.C Approvals and other Documentation

16. Supporting documentation

17. Distribution

18. Other information

19. Site Safety Engineer’s Approval

20. Attachments (Compulsary)

Risk Assessment

Inspection and Test Plan

Quality Control Check Lists

EXMET – Useful detailed drawings.




1. SCOPE & OBJECTIVES

The Purpose of this procedure is to ensure that Block Works are executed in accordance with the contract requirements,

hazards are analyzed, safety procedures implemented all quality assurance/control activities are conducted in a

systematic manner, works inspected and conformance is verified and documented for Villa on BVS-43 at The Pearl

Qatar.

2. REFERENCES

2.1 QCS 2010 Section 13 Masonry

2.2 QCS 2010 Section 05 Concrete

2.3 Project Health, Safety and Environmental Guidelines

2.4 Project Quality Plan

2.5 Project Inspection and Test Plan – Civil Works

2.6 British Standard BS 8110 – Structural use of concrete

2.7 Contract Drawing and Specification

3. ACCESS/ EGRESS

Adequate access and egress should be provided to the site. Access will be through designated entrance and exit

pathways only.

4. LOGISTICS

Contractor will deploy a dedicated team for the concreting works.

5. HEALTH & SAFETY HAZARDS

5.1 All workers involved will be trained in hazard recognition and control measures necessary especially in safe

manual handling techniques.

5.2 Safety system / method of work covering formworks installation, scaffolding erection, block laying, grout mixing

on site and mix transport will be established.

5.3 Appropriate personal protective equipment (PPE) should be worn at all times.

5.4 Secure barricades within the area whenever necessary.

5.5 Washing facilities should be provided.

5.6 Provision of scaffolding when working at heights and only qualified persons will erect and dismantle the scaffolds.

5.7 Working area where objects and debris are falling will be declared as restricted zone and will be barricaded.

5.8 Scaffolds will only be used for its intended purpose and capacity. Never used scaffold as blocks storage.

5.9 Wearing safety harness when working on heights shall be strictly implemented to not less than 1.8 meter.

5.10 Keep the work place clean and tidy at all times.

5.11 Only qualified and trained personnel will do the task.




6. DEFINITIONS

AEB – Arab Engineering Bureau (Consultant/Engineer)

AMTC – Abdullah Al Muftah Trading and Contracting Co., w.l.l (Main Contractor)

MS – Method Statement

QCP – Quality Control Procedures

ITP – Inspection and Test Plan

ITA – Independent Testing Agency

7. RESPONSIBILITIES / SUPERVISION

7.1 Project Engineer shall be responsible for the execution of this procedure and to ensure that works are undertaken in

a safe manner to the requisite quality and to the time agreed timescale. He shall advise and coordinate with other

contractors pertaining to access and interface requirements.

7.2 Site Engineer shall be responsible for the site implementation of this procedure including control and the safety of the

workers.

7.3 Surveyor in coordination with site engineer has the responsibility to perform all survey works according to the

approved shop drawings.

7.4 QA/QC Inspector shall be responsible for the supervision of tests and inspection, control approvals for testing and

inspection plan and to arrange documentation required.

7.5 Safety Officer shall be responsible for the strict implementation of safety procedure during work commencements.

8. PROCEDURE / METHOD TO BE EMPLOYED:

8.1 General

a. All reference shop drawings shall be the latest Issued for Construction drawings showing installation details,

sizes, profiles and reinforcement.

b. Obtained block supplier and material samples approval prior to start of the work.

8.2 Delivery, Storage and Handling

a. Store masonry units on elevated platform or pallet in a dry and firm level ground away from vehicular traffic

to avoid contamination.

b. Blocks to be stored as near as possible to the work, keeping re-handling minimum.

c. Store sand materials where grading and other required characteristic can be maintained and avoid

contamination or inclusion of other materials is prevented.

d. Store cementitious materials on elevated platform, under cover, and in a dry location.

e. Store masonry accessories including metal items in an enclosed and dry location to prevent corrosion and

accumulation of dirt.

f. Blocks shall be handled properly to prevent damage.




8.3 Methodology for External Walls

a. The pre-insulated masonry units will be supplied by the approved manufacturer (Khalid Cement Industries) and

will comply the requirements of ASTM C140 and BS EN 772.

b. The masonry walls shall be as noted and shown on approved shop drawings and schedules.

c. For site batching of mortar mix, standard size containers should be used to ensure correct proportion of

materials. The use of shovels to gauge the amount of materials cannot be relied upon to give consistent

performance. Additives should only be used upon the Designer’s permission, and with the advice from the

manufacturer. Machine mixing is recommended to achieve a thorough blend of mortar.

d. It is a good practice to dampen the masonry units before laying, and to lay the mortar beds in shorter lengths to

reduce rapid loss of water from the mortar through evaporation before the next course is being laid.

e. As the masonry blocks is being erected, lay stainless mesh reinforcement (Exmet) in the mortar joints at every

4th layer. Where 2 pieces of reinforcement are joined, an overlapping of minimum 150mm should be provided.

Lintels should be installed for doors and windows opening.

f. A layer of metal lathing (mesh reinforcement) should be provided at the following locations to minimise the

development of cracks: interfaces between brick and RC elements; around door frames; around steel lintels; and

around openings for electrical services.

g. MEP services that penetrate the external walls should be housed in trunking boxes (if possible), with the

surrounding gaps properly sealed to prevent any leakage.

h. Mortar infill should be properly compacted between the last course of masonry unit and the beam/ slab soffit .

Joints should be checked after excess mortar is removed from the brick face to ensure that the joints are properly

filled.

8.4 Setting Out

a. Setting out of the block work shall be made and inspected by AEB representative before proceeding further.

b. Care must be taken to ensure accuracy of initial setting out and it is important to maintain uniformity of joint

thickness and alignment of vertical joints.

c. When setting masonry, care should be taken to reduce the cutting of masonry units to a minimum and to

avoid irregular and broken bond, particularly at openings.

8.5 Concrete masonry units / Pre-Insulated Masonry Units

a. Masonry units shall conform to BS EN 771-3 or ASTM C 90.

b. Testing for external walls, foundation walls and load bearing walls shall be tested per BS EN 772 or ASTM C

140. Compressive strength shall not less than 7 MPa for average for 10 blocks or not less than 5.6 MPa for

individual block.

c. For internal non-load bearing walls, compressive strength shall not be less than 2.5 MPa for average of 10

blocks and not less than 2.0 for individual block.

d. Pre-Insulated concrete masonry units shall be comply as per project specification Section 13 Part 1.2.4.




8.6 Block works accessories / reinforcement

a. All joint reinforcement shall comply with Part 5 Section 13 of Qatar Construction Specifications (QCS).

b. Provide horizontal reinforcement of expanded steel mesh or ladder type reinforcement fully

embedded in every 3 courses and ends shall be terminated by powered driven nails (By Hilty) into

adjacent concrete wall / column surface with 1.5 mm minimum thickness fishtail-angle of

corrugated-angle type wall ties.

c. External and below-grade walls horizontal reinforcement material shall be Stainless steel Grade 304 and hot

deep galvanized steel for internal walls.

d. Vertical bar reinforcement shall be properly positioned, secured against displacement and supported near

each end and at intermediate intervals not exceeding 80 bar diameter. The cavities containing the

reinforcement are to be completely filled with mortar.

e. Intersecting masonry walls/partitions shall be secured. Ties shall be fully-embedded in the horizontal joints at

vertical spacing not exceeding 600 mm.

f. Provide double triangle or butterfly type ties for cavity masonry wall as specified in Table 5.2 Part 5 Section

13 of Qatar Construction Specifications (QCS). See Table 5.2 below:

Cavity Width (mm) Maximum Horizontal Spacing (mm) Maximum Vertical Spacing (mm)

50 -75

75 – 100

100 - 150

1,000

800

500

400

400

400

Table 5.2 Spacing of Wall Ties in Cavity Walls

8.7 Mortar and Grout Mixes

a. Block mortar shall have mix proportions complying with BS 5628-3 and as specified in Table 2.1 of part 2

Section 13 of 2007 Edition of QCS. (Class M6; 1 Part cement : 2.5 to 3.5 Part sand)

b. Minimum compressive strength of grout shall be 17.5 MPa at 28 days.

c. Mixing shall be carried out by means of mechanical batch mixer (1-bagger) and a measuring box shall be

used to ensure compliance with the design mix.

d. When using hand mix, it shall be mix in a clean and water tight platform. The mortar shall be mixed dry until

uniform mix is obtained then water is added and mix continuously until a homogenous mix is obtained.

e. Freshly mix mortar shall be protected at all times to avoid contamination and prevent excessive evaporation.

8.8 Laying, cutting and jointing

a. Masonry laying shall comply to BS 5628-3 and Part 5 Section 13 of QCS.

b. Block works shall be done by skilled and experience manpower.

c. Safe, rigid and approved scaffolding shall be provided for workers who are working at elevated areas.




d. Concrete surfaces that will receive block shall be properly prepared by roughening or removing laitance and be

clean prior to laying of mortar and blocks.

e. All block work shall be set out before laying commences to ensure correct bonding and minimum cutting.

Power tools shall be used for cutting of block works if necessary.

f. Block work shall be constructed plumb to the lines and levels shown on the IFC drawings.

g. All bed and vertical joints are to be spread with mortar to ensure complete and solid bedding through the full

thickness of the wall.

h. Each block shall be adjusted to its final position in the wall while the mortar is still plastic. Any block which is

moved after the mortar is hardened shall be removed and re-laid with fresh mortar.

i. The average thickness for both vertical and horizontal mortar shall be 10 mm respectively of any key in the

joint surface of the block work joint.

j. Half block and cutting block is permitted where necessary to achieve correct bonding.

k. All vertical and horizontal lines are to be kept true and square, other angles are to be plumb and bed joints

levelled as the works proceed.

l. Lintel beams and stiffness columns shall be provided, lintel beams shall be provided at full length and

anchored from wall to wall where wall height exceeds 3 meter and stiffness column shall be provided

every 6 meter.

m. Work to be carried out by course and not leaving any parts more than 800 mm lower than the other.

n. Excess mortar shall be removed with trowel head and bed joints grooves to form key for further plastering and

rendering works immediately after laying 2 layers of blocks. Care to be taken to avoid mortar smearing or

staining of any sort.

o. In cavity wall construction, both sides are to be carried up together not leaving any leaf more than 400 mm

below the other.

p. All openings will be formed with the uncut face of the block. If the laid single block on top of the wall opening

cannot provide bearing area on each side, lintel beam will be provided. Opening longer than 1 hollow block will

have lintel on top. As per AEB comment, all openings must be provided with 100mm thick concrete at

jambs and sills.

q. Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath in the

joint below and rod mortar or grout mortar into core.

r. Install compressive filler in joint between top of partition and underside of structure above. For fire-rated wall,

approved fires topping materials shall be apply as per manufacturer recommendations.

s. Site Engineer shall ensure sufficient manpower and materials are available for continuous installation.

t. All new or partially built walls are to be protected against drying out to rapidly by spraying surfaces with clean

water.

u. Exposed masonry surfaces shall be cleaned on completion.

v. Final inspection report shall be carried out for final approval by AEB representative.




8.9 Construction Tolerances for Block works

a. For conspicuous vertical lines, such as external corners, door jambs, reveals, and expansion and control

joints, plumb shall not be vary by more than 6 mm in 6 meters, with the maximum line thickness of 12 mm.

b. For vertical alignment of exposed head joints, plumb shall not be vary by more than 6 mm in 3 meters.

c. For conspicuous horizontal lines, such as exposed lintels, sills, parapets and reveals, plumb shall not be vary

by more than 6 mm in 6 meters, with the maximum line thickness of 12 mm.

d. For exposed bed joints, thickness shall not be vary by more than 3 mm, plus or minus, with the average of 10

mm thickness. Bed joint thickness of adjacent courses shall not be vary by more than 3 mm.

9 TRAINING

Relevant trainings and orientations have been provided to person who will perform their specified task.

10 WORKING HOURS

As scheduled.

11 HOUSE KEEPING

Working Areas will be kept clean by disposing the waste materials at the designated areas. At the end of days’ work,

installation supervisor will ensure that the debris are disposed off.

12 MAN POWER REQUIREMENT

Foreman

Mason

Laborers

13 MATERIAL REQUIREMENT

All blocks, masonry reinforcement and accessories materials to be used shall be duly approved and installation / placing

to conform to the project specifications and Qatar Construction Specification (QCS).

14 PLANT & EQUIPMENT REQUIREMENT

a. Mixer Machine

b. Gauging boxes

c. Wheelbarrow for transporting materials

d. Hilti Gun with fixing nails

e. Hand tools




f. P.P.E.

15 QC APPROVAL AND OTHER DOCUMENTRY REQUIREMENTS:

All works shall be done with accordance to Approved Method Statement and Project Specifications. Request for

inspection shall be submitted for Engineers approval prior to the works commencement.

16 SUPPORTING DOCUMENTATION:

This MS to be read in conjunction with the below referenced documents

Contract Specification & approved drawings.

Project Quality Plan

Project HSE Plan

17 DISTRIBUTION

Copies of this MS will be circulated to the following for Information & action

Sr. Construction Manager

Site Engineer

QA/QC Engineer

HSE Engineer

18 OTHER INFORMATION

Ensure that all the activities have been carried out to suit the site conditions and involved

With Site –in – charge

19 MAIN CONTRACTORS SAFETY ENGINEERS APPROVAL

APPROVAL STATUS SIGNATURE

Approved

Approved subject to compliance with

the following notes

Not Approved – with reason




20 ATTACHMENTS (Compulsory)

Risk Assessment

Inspection and Test Plan

Quality Control Check Lists

EXMET – useful detailed drawing


Documents

243-Method Statement for Block WOrksrev1