Random Rubble Retaining Walls
November 7, 2010
Construction of the Foundation
• Finished level would be marked by the surveyor using pegs.
• Curing would be carried out using wet gunny bags or using a sprinkler system and a proper curing would be maintained until finish the specified curing period.
• Form work would be made using 12mm thick plywood sheets and plywood sheets would be cut to the required dimensions by a hack saw.
• Each plywood sheet would be firmly jointed and supported by 2″x2″ timbers.
• Each side of the form work would be supported by 2″x2″ timbers to avoid the undesirable movements while concreting.
• Reinforcement frame would be made as per the drawings with required bar sizes, cover and spacing.
• Cover blocks would be provided to keep the bottom cover.
• Concreting area would be properly cleaned to remove the dust and other impurities by a manual mean.
• Slump of the mix would be checked at the site before concreting.
• Concrete would be placed in successive layers and poker vibrator would be applied while concreting.
• Curing would be done using wet gunny bags after 24 hrs from concreting and it would be preceded up to 7 days.
Construction of RR Masonry Wall
• 6X9 RR masonry would be neatly packed and bonded by using cement motar and all cavities would be filled by smaller sizes. Horizontal and Vertical alignment would be properly maintained using a plumb bob.
• Cement motar (1:5) would be prepared by manual mixing taking its constituents according to the specified proportion. Sufficient water would be added gradually after few seconds from the mixing of cement and sand. The motar mixture would not be allowed to be dry and the required moisture would be controlled by adding water.
• Number of steps would be provided depending on the height of the retaining wall.
• 12mm thick regiform sheet would be inserted vertically in each 5m intervals for the purpose of Expansion joints (length of the interval can be changed due to the length of the retaining wall)
• Weep holes would be provided by inserting PVC pipes as directed by the Engineer.
• Inlet of the weep hole would be enclosed by a suitable geotextile and stone packing would be made around the geotextile as directed by the Engineer.
• The exposed surface of the retaining wall would be plastered using cement motar (1:5).
6.0. Safety Plan
6.1 Safety Management Action Plan
In order to minimize the occurrence of site accident, the provision of a safe working environment for workers to work is essential. Our company endeavors to make a zero accident record in each site. In addition to the above, the following safety precaution must also be implemented in achieving the minimization of site accidents.