Building concrete work
BUILDING CONCRETE WORK
Building concrete work
Scope of the work:The scope of this building concrete works is to provide the detailed description of concrete works for building concrete works project. The purpose of this method statement is to set the methodology for the safe method of construction required for associated building civil works. This method statement is prepared in full compliance with the contract specification. Surveyor is responsible for all survey works relevant to the specific activity to mark and identify the locations and corresponding elevations. And safety is responsible for the enforcement of safety and ensures that all the works are carried out in accordance with company safety procedure and in line with HSE (health safety environment) plan. And QC (quality control) inspector (civil) is responsible for the QA/QC activities for the site with QC civil for witnessing the activities in the site. Placement of crane, other construction equipment movement shall be planned in sequence without clashing with other works in the area. Sequence of activities shall be planned prior to start the work.
Blinding concrete: Surveyor should mark the size and location with elevation of blinding after formation level achieved by earth works and released for concrete works. Erect form work for blinding at 75mm thickness as per approved drawings for each specific foundation. Cast the concrete blinding with approve mix design class C20 grade. Allow the concrete blinding to be hardened and cured as per relevant specification. this should be read in conjunction with method statement.
Form work: Forms shall be of wood and plywood is used for exposed surfaces and is of type 18mm thick plastic coated plywood to achieve the specified finish. The forms shall be faced to give the specified class of finish for the structures. The form surfaces for exposed concrete shall be smooth, true and free from all irregularities. All exposed finished edges of concrete shall be chamfered by chamfers cut from nominal 25mm x 25mm timber unless special architectural finishes are specified.
Reinforcement: The reinforcing bars, ties, links, stirrups and all other reinforcing shall be positioned and rigidly fixed exactly as shown on the drawings such that the minimum cover requirements are achieved and the true alignment of the reinforcement is the maintained. Splices in reinforcements shall be made at design locations shown on the drawing. All reinforcing bars shall be stored on the site on supports suitably spaced and at sufficient height to keep the steel clear of the ground. Long term storage shall be minimized on site.
Scaffolding: All the above ground constructions for buildings superstructure walls, columns, elevated slab and roof slabs shall be executed on scaffold platforms. These platforms will support form work, safe access as well as platform for concreting work. All the scaffold platform shall be inspected and released for use prior to go for intended work. Scaffold for slab shall be prepared as per approved drawings. No scaffold platform shall be used without inspection and certified approval.
Structural concrete: Transport of concrete shall be in a truck mixer to site discharge point within 1 hour after the time of loading. On completion of delivery of the concrete the truck mixer may be washed down on site only at designated location. The wash down from the internal of the truck mixer shall not be discharged on site but shall be returned to the batching plant for disposal. A concrete and inspection test plan including all actions to be dealt with relevant execution. Concrete shall not be placed unless the positioning, fixing and condition of the reinforcement and any other embedded items; the cleanliness, alignment and suitability of the containing surfaces have all been inspected and approved. Forms shall be well soaked with water prior to concreting. Concrete shall not be freely dropped from more then 1.5m height. Concrete pump/crane with bucket shall be used when mixer can not reach the location.
Removal of form work: All form work shall be removed as per the times. After removal the form work, all fins and projecting edges shall be cleaned from the concrete faces which are to be exposed in the permanent works and if the surfaces require dressing it shall be as described in the relevant standard. Curing procedures shall be initiated immediately after removal of form work.
Repair: Touching up of concrete surfaces after the removal of form work is not permitted until they have been inspected and released in accordance with the quality procedures. The repair method including materials and the extent of the repair works to remedy the imperfections of the concrete shall be specified and approved for each repair case and comply with the design requirements of the structure concerned. This is the good way for the building concrete work.