Tiêu đề 26.MS.Road Work 02-06-18.pdf ✅

ASHIANA HOUSING LIMITED METHOD STATEMENT FOR ROAD WORK INTRODUCTION This method statement describes the activities to carry out Road works as per specifications. OBJECTIVE Following documents shall be considered as reference for execution of the job: • Approved layout of roads. • Levels of Roads. • Location of speed breakers. 1) Paver Road MATERIAL GSB, WMM material, Concrete paver (M 30 grade, 60mm thick), Sand, cement, stone dust. APPARATUS/EQUIPMENT: Cutting machine, Plate compactor, Level pipe, nylon thread, Trowel, Measuring Tape, Aluminium phanti, Rubber Hammer (For setting pavers), Vibro roller, Auto level. HEALTH AND SAFETY PROVISION:  Ensure Protection equipment, dust mask and hand protection gloves are being used.  Engineers and supervisors to ensure safety measures are being followed. PREPARATORY WORK:  Identify all work areas that would be needed for road work.  Start point and finish point to be marked in both directions.  Slope in camber and in longitudinal direction to be pre defined.  Surrounding areas of road work to be free from rubbish or debris.  Surface of WMM should be cleaned with mechanical broom and free from all dirt, scales, oil, and grease.  Management of traffic should be pre defined.

HEALTH AND SAFETY PROVISION:  Ensure Protection equipment dust mask and hand protection gloves are being used.  Engineers and supervisors to ensure safety measures are being followed. PREPARATORY WORK:  Identify all work areas that would be needed for road work.  Start point and finish point to be marked in both directions.  Slope in camber and in longitudinal direction to be pre defined.  Surrounding areas of road work to be free from rubbish or debris.  Surface of WMM should be cleaned to make it free from all dirt, scales, oil, and grease.  Management of traffic should be pre defined. PROCEDURE 1.) Sub grade Prepare and consolidate sub grade with vibro roller 8 to 12 T capacity after excavating earth as required. Dress to camber and grading as per requirement. Consolidate with road roller to get even surface and compact to get dry density of sub-grade not less than 95% in case of filling. 2.) Granular Sub Base Construct 100 mm thick granular sub-base-cum-drainage layer with graded materials like natural sand & crushed gravel / stone and spread in uniform layers with motor-grader on prepared surface. Use mix in place method with rotator at OMC, and compact with vibro roller of 8 to 10 T static weight to achieve the desired density. 3.) Wet Mix Macadam – Base Lay and compact 100 mm thick layer of graded stone aggregate to wet mix macadam. Lay in uniform layer on sub- base course compacting with vibro roller to achieve the desired density and finish the profile by spreading cement @5kg/sqm. 4) Primer coat Apply primer coat with bitumen emulsion of SS1 grade on prepared surface of granular Base. Spray primer @ 0.75 kg/sqm with mechanical means. 5) Tack Coat Apply tack coat with bitumen emulsion (RS-1) on the prepared granular surface @ 0.40 kg/sqm with mechanical means.
6) Dense Graded Bituminous Macadam 1.)Lay Dense Graded Bituminous Macadam of 50 mm thickness using crushed aggregates of specified grading. Premixed with VG 30 Grade Bitumen @ 5% (% by weight of total mix) and lime filler @ 2% (% by weight of Aggregate) prepared in a Hot Mix Plant, transport hot mix to work site. Lay with a hydrostatic paver finisher to the required grade, rolling with smooth wheeled vibro roller to achieve the desired compaction. Mixing of DBM material at hot mix plant 150°C– 165°C. Temperature of DBM when material is laying 140°C minimum and rolling temperature must be completed before the material cools to 90°C minimum Lay Seal coat of 5mm thickness, consisting of premixed fine aggregate (passing 2.36 mm and retained on 180 micron sieve) with bitumen using 7% (% by weight of aggregate) of bitumen of grade VG-30 prepared in a Hot Mix Plant transport the hot mix to work site. Lay with a hydrostatic paver finisher to the required grade, rolling with smooth wheeled vibro roller to achieve the desired compaction. Temperature will be remain same as BC process. INSPECTION:  Thickness of DBM layer should be check by gauge.  Temperature of DBM when material is laying 140°C and rolling temperature must be completed before the material cools to 90°C minimum  Mixing of DBM material at hot mix plant 150°C – 165°C.  Sample of DBM should be collect from site during work and test of bitumen content in sample should be check in authorized laboratory.  12–13 hours gap to be maintained between primer coat and tack coat.  Camber and level of road to be checked before GSB.  Dry density minimum 95% in sub grade in filling earth to be checked.  Movement on road to be allowed after 3 hours of final rolling.