Safe work method of statement for the production & erection of precast concrete boundary wall for the project.
0Moulds to be used for casting precast units shall be constructed properly to achieve required finishes and dimensions in accordance with the approved shop drawings. These moulds where possible shall be fixed on mould pallets.
Completing each cycle the mould and production pallets shall be visually inspected to identify any wear and deformation.Production Staff.
Steel reinforcement to be used as per approved shop drawing details & MEP services /provisions to be checked/coordinated and to be provided if required.Production Staff.
Reinforcement cage shall be prepared as per approved shop drawings and placed inside the mould after applying mould release compounds.Production Staff.
Prior to casting of the elements QA/QC inspector will ensure that reinforcement cage and moulds are as per the approved shop drawing.QC Inspector.
Concrete shall be placed as to retain no appreciable amount of entrapped air other than entrained air and to avoid detrimental segregation. Concrete is produced from the fully atomized batching plant attached to the precast factory. For flat elements the placed concrete shall be compacted using clamp on vibrator (also known as external vibrators) at the casting station. And for the footing, needle vibrators are used.
All surfaces of newly cast concrete shall be protected against drying out. The protection against drying out shall be maintained until the minimum concrete strength expressed by the cube strength at the end of curing (10N/mm²). Protection against drying out is carried out without addition of water by keeping the formwork in place and covering the concrete surface with vapour – resistant sheets that are secured at the edges and joints to prevent through draughts.
On achieving required strength the finished precast products are lifted out of the production pallets using the demoulding crane. These are later water cured for 72 hours at stockyard.
After demoulding the products will undergo final inspection. The products are then marked /labeled to ascertain that the consignment is as ordered & with relevant position of each precast element within the works.
Measuring of dimensions to ensure conformity with the requirements of the standards and the requirements for the manufacturer declared properties.Production Staff.
Safety procedures should be followed on site.
All the erection personnel shall wear PPE (Personnel Protective Equipment) at all times. Any personal without necessary safety equipment shall not be allowed to enter the work area.
A competent and trained erector, foreman, banks man and Slinger personnel’s should able to carry out all functions.
Safety during the installation operation, it is important that components are loaded so that unloading should carried out in appropriate sequence. However, this must never be at the expense of the safe transit of the complete load and therefore some double handling may be required at the point of installation.
Components must be unloaded in such a manner that the stability of the delivery vehicle is not adversely affected.
Prior to erection the Site Safety Officer shall inspect the Mobile Crane work area including its setting up and duly sign off the area for erection.
All the erection equipment (chains, belts etc) shall be thoroughly checked by the foreman before commencing erection.
All operatives shall be given safety instructions and training prior to arriving on the site. No Entry below the hoisted precast concrete elements.
Prior to arriving on the site the Work area, the area on a site or building where precast components are being erected, will be inspected. This includes the area covered by the radius of a crane from lifting off a lorry (or stack) to the final position. And, if any, corrective measures shall be informed in timely manner.
After inspection of the work area, a sequence of onsite installation shall be agreed with the Client/Main Contractor. This includes the site access route and the mobile crane capacity (responsibility of Client/main contractor). We recommend respective crane operator to inspect the work area before finalizing the crane capacity. Note – The manufactures rating capacity for
crane refers to its safe load carrying capacity at a minimum radius and often bears little relation to its actual capacity at a working radius when lifting precast elements,
Precast concrete elements shall be erected by mobile crane of adequate load carrying capacity Erection shall be carried out as per approved drawing consisting of plans and sections showing the position and connections of the products in the completed works.
If required to assist in final positioning leveling shims shall be used.Erection Team.
Any cracks or damage of non-structural nature that do not require replacement shall be left in place and repaired on site subject to Engineers approval.
Corners of the footing shall be marked on the blinding. The main contractor to mark the coordinates along the length of the wall.
Footing shall be placed in designated location. If required for final positioning crow bar will be used.
Panels shall be erected on the footings and shall by supported by supporting jacks.
Panel – footing connection shall be then completed with non-shrink grout/concrete screed (40N/mm2 or as per the design). This shall be supplied by Client / main contractor.
The next day the jack shall be released.Erection Team. Inspection request to be submitted and ensure its approval.