METHOD STATEMENT FOR CONSTRUCTION OF BOX CULVERTS SCOPE OF WORK As cross‐main drainage structures, box culverts will be constructed at instructed locations by the Supervisor’s Representative to replace hydraulically inadequate pipe culverts. METHOD A site store has been set‐up to stock materials including cement and reinforcing steel. Mobilization of plant and equipment will commence upon receipt of a go ahead/ site instruction to commence work on the culverts. The main works will include activities such as setting out, excavations, blinding, reinforcement and formwork, batching, mixing and casting, curing and backfilling. All works will only commence upon acceptance and/or approval of previously completed work at every stage of the construction. Safety precautions are to be adhered by ensuring that, all plants are operated by authorized operators. Besides, all workers in the concrete section will be provided with safety gears including dust masks, hand gloves, gumboots, helmets, goggles and others as applicable. DESCRIPTION OF OPERATIONS Activity Setting out Excavations
Details/ Description A survey team consisting of one surveyor, two assistances and four chainmen will take levels and set out the excavation area by use of pegs to mark points on the ground. Upon acceptance of the setting out by the S.R, excavations will be done by use of a back hoe loader to the satisfaction of the S.R. Excavated levels will be taken after acceptance of excavations.
Plant 2 No. Pick up 1 No. back hoe loader
labor 1 No. surveyor 2 No. assistance 4 No. chainmen 2 N o. driver 1 No. operator 1 No. foreman
Blinding, Reinforcement Formwork Batching Mixing and casting Quality control
Curing and Backfilling.
Teams headed by a concrete foreman will start with blinding the base to the specified thickness using materials complying with specifications and of approved mix design to the acceptance of the S.R. Reinforcement will be laid and fixed by adhering to the bar bending schedule and any other site instruction issued by the S.R regarding bending of steel bars. Upon approval of the reinforcement, formwork using wrought and unwrought timber will be firmly fixed to the satisfaction of the S.R. Batching to the instructed mix design will be done for concrete materials that comply with relevant Specifications. Upon acceptance of batching, concrete mixing will be done by means of a concrete mixer and concrete casted and compacted using a poker vibrator to the satisfaction of the S.R. Concrete cubes at acceptable batch intervals will be cast to monitor quality of concrete laid. Similar procedures will be applied to construct the walls, end structures and finally the deck all to the satisfaction and approval of the S.R. A team led by the concrete foreman will ensure proper curing of the structures with adequate portable water. After curing, a team headed by the earthworks foreman will ensure that backfilling with specifications compliant materials is adequately compacted and accepted by the S.R.
1 No. 300 ltr. Concrete mixer Or 1 No. self propelled mixing plant 3 No. pick‐up 1 No. water tanker 1 No. tipper truck 1No. poker vibrator
