Concrete Retaining Wall

•    Reinforcement arrangement in the wall section would be provided as shown in the drawing by lapping with previous bar arrangement. If the wall height is more than the single bar length, lapping would be provided at 1/3 of the wall height from its bottom or top.
•    PVC pipes would be placed inside the reinforcement arrangement in a spacing as directed by the Engineer in both ways to the required slope and the length for the purpose of providing weep holes.

Concreting Work:
•    The concreting area of the wall would also be cleaned to remove all the unsuitable matters before start the concreting by a manual mean or using compressed air.
•    12mm thick regiform sheet would be placed vertically in each 5m intervals for the purpose of Expansion joints (length of the interval can be change due to the length of the retaining wall)
•    Slump of the mix would be tested at the site by the standard slump measuring methods and the result shall confirm to the specified workability of the concrete mix.
•    Concrete would be placed in successive layers and porker vibrator would be applied while concreting. Shutter vibrators would also be applied while concreting where the volume of concreting is too large.
•    Curing would be done for base concreting using wet gunny bags after 24 hrs from concreting and it would be preceded up to 7 days.
•    Inlet of the weep hole would be enclosed by a suitable geotextile and stone packing would be made around the geotextile.

•    Back filling behind the structure would be done using suitable filling materials
•    Lower layers would be filled using embankment type 02 materials
•    Top 500 mm would be filled using embankment type 01 material
•    Compaction would be preceded in successive layers with the application of vibrator roller or rammers.

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.

6.1.1 Site Staff and Labor

•    Safety Induction Training would be conducted to all new employees by the Safety Officer prior to start any work.
•    Regular safety induction courses and toolbox talks would be arranged on site for operative and supervisory staffs and in particular for those new workers.
•    Personal Protective Equipment (PPE) such as safety boots and helmets would be provided with workers.  In addition, adequate PPE (e.g. ear and eye protectors) should also be available for construction works as required.
•    Barricades with warning signs would be established all around the excavated area, “Retaining wall under Construction” the wording would be given in all three languages.
•    All tools, plant, equipment and temporary facilities and all other items use to carry out the work should be in a safe, sound and good condition.
•    Alcoholic drinks and other substances, which may impair judgment, would be prohibited from the Site.
•    Working Radius: Mamoties and jungle clearing knife should have working space to move freely without hurting other employees.
•    Fall Prevention Measures: Investigation would be take place to identify falling hazards and preventive measures would be taken immediately.
•    Workers would not be allowed to work in the stream water unless provide with a safety belt with a long lanyard in order to rescue them in case of drowning. In addition, workers would be provided with life jackets.
•    A notice would be erected to prevent outsiders entering to our work sites, “No Entry for Outsiders”.
•    Signalmen would be deployed if the work spaces disturb traffic flow in the main road.  A traffic supervisor would also be deployed to take responsibility over the traffic control.
•    First Aid Facilities: First aid facilities such as a first aid box would be made available for in case of minor injury treatment.

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