estimation and quantity surveying

estimation and quantity surveying

• 1.
  Project : Approximateestimation of Rigid pavement Item : Excavation in Hard Rock (by Blasting) By Sandeep Bora AP14003 Anchit Agrawal AP14012 Aditya Avinashe AP14079 Pratik Dalai AP14081 Shivali Kalra AP14088
• 2.
  Topics  Approximate estimationof rigid pavement  Specifications of excavation in hard rock  Brief Specification  Detailed Specification  Rate Analysis for excavation in hard rock
• 3.
  Rigid pavement costper km Sr No Project Distance (km) Cost (cr) Cost/km (cr) 1 Mudhol Maharashtra border road on SH 18 in Karnataka 107.94 317.60 2.94 Contractor- Ashoka Buildcon and GVR Infra (On going project) 2 Malavalli to Pavagada(karnataka) 193.34 313.65 1.62 Contractor- Sadbhav Engineering Ltd and GKC Projects Ltd (On going project) 3 Trichy Karur road(4 lane road) 63.00 732.84 2.91 Contractor-Reliance Infra (completed project) 4 Construction of approach road from South Garo Hills to Jetra 17.00 28.76 1.69 (On going project) 5 Construction of road from Pakoti to Kamsha 6.50 9.50 1.46 (On going project) AVERAGE cost per km 2.13
• 4.
  Brief specification  Excavationfor foundation in hard rock by blasting including trimming and levelling the bed and removing the excavated material and stacking it into measurable heaps within a distance of 50 meters from site area. Lift: 0 to 1.5m
• 5.
  Detailed specification  Scopeand objectives  Equipment used  Material Used  Workmanship  Testing and Acceptance Criteria  Mode of measurement and payment
• 6.
  Scope and Objectives The purpose of this procedure is to establish the methodology to be followed for excavation work during the construction phase .  This procedure is applicable to the execution team. It intends to co-relate and control the entire task needed to be done in order to achieve satisfactory construction excavation work.  Excavation is to be done for Hard rock by the means of blasting.  We have used a machine intensive approach .  Scope of work- 10 cubic meter
• 7.
  Equipment deployed  HydraulicExcavator  Tipper  Jack hammer
• 8.
  Hydraulic excavator Excavator(Hyundai 250R)Purpose: Digging of trenches ,holes and foundation. Material handling, Pising, Demolition Attachment: Bucket, Breaker, Auger Rent Rs 2200/hr Capacity: Bucket size: 0.93 cum
• 9.
  Tipper Tipper (Bharat Benz)Purpose: Hauling of material Charges  Monthly rent (1.25 lakhs excluding diesel) Capacity: 14 cum
• 10.
  Jack Hammer Jack hammerPurpose: Drillingof holes, Depth of drilling is 2m in this case Action of drilling takes place by percussion action. A pilot rod is drilled into the surface with the help of jackhammer Charges: Rs11/ft or Rs 400/hour
• 11.
  Material Used  Explosives Special Gelatine (gelatine stick)  Powergel IDL  25 mm thick  Rs 2000/25kg  Each stick of 125 grams.  Electric detonator  SED – Rajasthan Explosives  1.8 m long wire  Rs 12 / Piece
• 12.
  Workmanship  Preparation ofsurface: o Firstly the ground for blasting should be cleared of all obstacles. o The ground should be preferably leveled. o The ground should be cleaned and marked.  Method of Blasting: o Holes are to be drilled in triangular pattern for the required length. o The electronic detonator is inserted into the explosive gel tube which is connected to the external wire circuit o Explosives are placed within the hole and are then grouted with dry soil up to the top o The connection are checked and rechecked by the blaster o All the explosives are connected in parallel and series connection o This wire is connected to the detonating fuse. o warning siren are sounded at an interval of 5 minutes before blasting, all the traffic in the area should also be halted & red flags to be placed along the way, fragile structure should be covered by polymer or plastic sheets to avoid damage. o The blast shed should be located at least 10 m from the blasting area. o After the detonation has taken place the area is excavated with the help of a excavator & loaded into the tipper. o Small pieces of rocks are removed and ground is levelled.
• 13.
  Blasting pattern
• 14.
  Testing and AcceptanceCriteria  The dimensions of the pits will be checked as per the GFC drawings .  All over excavations filled back to required lines, levels and grades by placing plain cement concrete of grade M10 and/or richer and/or by compacted earth, as directed by the Engineer, at the Contractor’s cost.  Sand replacement method of testing the field density on site to ensure the desire densification has been obtained i.e minimum 95% of its maximum dry density.
• 15.
  Mode of measurementand payment  Mode of measurement- As per IS 1200(Part 1), o Mode of measurement for Excavation is in cubic meter o Each dimension shall be measured to the nearest 0.01m o Areas shall be worked out to the nearest 0.01 sq.m o Cubical content shall be worked out to the nearest 0.01 cu.m o Working Authorised working space shall be special in each case. Where authorised working space is not so specified the following shall apply: 600 mm measured from the face of substructure ( including protective measures, if any) at lowest level, where extra working space is required.  Mode of payment- o Payment shall be done as per the GFC drawings.
• 16.
  Rate analysis  Rateas per calculations: Rs 680.58  Rate as per DSR 2014: Rs 653  Rate analysis