Work method statement of brick and rubble masonry

Srinivasan

Administrator
Sep 7, 2017
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mumbai
Work method statement of brick and rubble masonry

SCOPE/PURPOSE:
Bricks shall be sound,hard,well-burnt , uniform in size, shape & colour ,homogeneous in texture, giving a metallic ringing sound, free from flaws, cracks, holes, lumps or grit and arises should be square, straight and sharply defined. They shall not break when struck against each other and dropped fat from a height of 1m to the ground. They shall conform with IS 1077
The Scope includes the brickwork and the workmanship to be adopted at site.

CODES / SPECIFICATION
IS 13612 Part1-1993

RESPONSIBILITY
Responsibilities of all concerned is clearly mentioned with respect to overall administration and implementation in the approved Organogram.

MATERIALS TO BE USED

Bricks
Maximum water absorption shall not be more than 15 % of its dry weight on immersion in water for 24 hours. Minimum Crushing strength shall be 3.5 kg/sq cm.

Cement
Cement used shall be ordinary Portland cement conforming to IS 12269.

Water
Water used for masonry shall be clean and free from injurious amounts of deleterious materials and shall confirm to specification given in concrete and mortar section

Fine aggregate:
Sand shall confirm to IS 2116 specification for masonry mortars.

Mortar:
Mortars for masonry shall be prepared in accordance with IS 2550 code of practice for preparation and use of masonry mortars. Mortar required is 1:5.

SAFETY REQUIREMENT
As per the requirement and the direction of HSE Officer.

DEPLOYMENT OF EQUIPMENT
As per the requirement of the site conditions and as per the the direction of Project Manager.

DEPLOYMENT OF LABOUR
As per the requirement and the direction of Project Manager.

IMPLEMENTATION
  • Bricks used for masonry in cement mortar shall be soaked by immersion in water at least one hour prior to start of actual laying. Bricks shall be laid in English bond unless otherwise specified. Bricks on edge must not be used unless specified.
  • Work shall be true to horizontal lines and perfect plumb. Vertical joints shall be truly vertical and those in alternate courses shall be in the same vertical line. Joints of each course shall be within the limit of 6 mm to 10 mm depending upon the size of the bricks.
  • Prior to start of work it must be noted and checked that bricks on top are full size bricks. To achieve this, precautions should be taken from the start of the first layer. Thickness of joint shall be adjusted such a way that full bricks will be there on top. Also it must be noted that all horizontal joints on every floor are at the same level, so as to allow proper bonding at junctions.
  • Required datum levels must be established through out the floor before start of work. It is imperative to raise the brickwork uniformly over complete work joined together. R.C. bands for partition wall shall be provided as per drawing.
  • Specified cement mortar must be placed within 30 minutes after addition of water.
  • Disallow vertical joint filling by spreading mortar.
  • For 230 mm thick wall, maintain one face in line. This face can be preplanned to take all kinds of single coat plasters. For higher thickness walls both faces should be in line.
  • First mark up layer of brick work needs to be laid in direct supervision for door / window / any other openings to be kept accurately as per the drawings or layout.
  • The buttress, counter-forts should be built simultaneously, maintaining proper bond with main wall and not added after wards.
  • Frogs shall be upward at all times. Joints shall be racked back to a minimum 10 to 15 mm while the mortar is wet. Surface of the brickwork shall be cleaned with coil string, wire brushes etc to keep the surface free for the need operation. All dropped and spoiled mortar, brickbats etc. shall be cleared from the floor before work is closed for the day.
  • Old or dry surface must be thoroughly cleaned and wetted. The joints should be raked before starting new construction.
  • Protection and curing:
  • Wet works shall be protected from rains by suitable covering. Masonry in cement shall be kept constantly moist on all the faces for a minimum period of ten days. The top of masonry shall be left flooded with water at close of the day.
  • For scaffolding purpose minimum number of holes should be provided in the horizontal direction and holes shall be provided by omitting header brick.
RUBBLE MASONARY

SCOPE/PURPOSE
The Scope includes the Rubble masonry work and the workmanship to be adopted at site.

CODES/SPECIFICATION
IS 12269, IS 2116.

RESPONSIBILITY
Responsibilities of all concerned is clearly mentioned with respect to overall administration and implementation in the approved Organogram.

MATERIALS TO BE USED


Stones:
Good quality stones with water absorption less than 5%.

Cement:
Cement used shall be ordinary Portland cement conforming to IS 12269.

Water:
Water used for masonry shall be clean and free from injurious amounts of deleterious materials and shall confirm to specification given in concrete and mortar section

Fine aggregate:
Sand shall confirm to IS 2116 specification for masonry mortars.

Mortar:
Mortars for masonry shall be prepared in accordance with IS 2250 code of practice for preparation and use of masonry mortars. Mortar required is 1:5.

SAFETY REQUIREMENT
As per the requirement and the direction of HSE Officer.

DEPLOYMENT OF EQUIPMENT
As per the requirement and the direction of Project Manager.

DEPLOYMENT OF LABOUR
As per the requirement and the direction of Project Manager.

IMPLEMENTATION
  • Rubble must be as per specification. It must be hard, durable and tough. The stones must be soaked before use. It must be roughly dressed and uniformly colored and of equal size.
  • The masonry work will be carried out as far as possible at one uniform level throughout, but where breaks are unavoidable the joint will be made in good long steps so as to prevent cracks between old and new work.
  • The stones must be arranged to break joints as much as possible and long vertical lines must be avoided in face work.
  • Spawls are to be used wherever necessary to avoid thick mortar beds for joints and shall not exceed 20 per cent.
  • The wooden mallet must be used to hammer down stone in the position and embed it in the mortar.
  • Iron templates are to be used to compact the mortar in joints.