Construction Methodology for Clearing & Grubbing

Construction Methodology for Clearing & Grubbing Process

1.       Name of activity:

           Clearing and Grubbing

2.       Highway Activities

3.       Description of Activity:

Clearing & Grubbing of  demarked area & disposal of unsuitable material with in the specified areas with all lifts and leads complete as per  MORT&H technical Specifications clause 201 and as per the direction of Employer/NHAI/I.C..

         

4.       References:

a)       Ref. to Technical Specification (MORT&H Spec. & Amendments)

a.1)    Clauses: 201

a.2)    Tables:   NIL

b)      Ref. other related works prior to this activity:

b.1)   Fixing of TBM Pillar, ROW & Center Line.

c)       Ref. to Drawing(s):

c.1)    Nil

d)      IS/IRC Specifications

d.1)   Nil

5.       Scope of Work:

This work shall consist of cutting, removing' and disposing of all materials such as trees, bushes, shrubs, stumps, roots, grass, .weeds, top organic soil not. exceeding  150 mm in thickness, rubbish etc., which in the opinion of the Employer/BSRDC/Consultant are unsuitable for incorporation in the works including draining out of water from the area of road land containing road embankment, drains, Cross Drainage structures and such other areas as may be specified on the drawings or by the Employer/Consultant/Engineer .It shall include necessary excava­tion, back filling of pits resulting from uprooting of trees and stumps to required compaction as per Cl. 305.3.4, handling, salvaging, and disposal of cleared materials. Clearing and grubbing shall be performed in advance of earthwork operations and in accordance with the requirements of these Specifications

MANPOWER REQUIREMENT

1.     Section In-charge

2.     Site In-charge

3.     Section Engineer

4.     Site Supervisor

MACHINERY REQUIREMENT:

Excavator, Dumper, Crawler Dozer, Water Tanker and Vibro roller.

Setting out will be done prior to work demarking the area of execution.

        Only such methods, tools and equipment as are approved by the Employer/Consultant/Engineer and which will not affect the property to be preserved shall be adopted for the Work. If the area has thick vegetation/roots/trees, a Crawler or pneumatic tyred dozer of adequate capacity may be used for clearance purposes. The dozer shall have ripper attachments for removal of tree stumps. All trees, stumps, etc., falling within excavation and fill lines shall be cut to such depth below ground level that in no case these fall within 500 mm of the sub grade. Also, all vegetation' such as roots, under-growth, grass and other deleterious matter unsuitable for incorporation in the embankment/sub grade shall be removed between fill lines to the satisfaction of the Engineer. On areas beyond these limits, trees and stumps required to be removed as directed by the Employer/Consultant/Engineer shall be cut down to 1 m below ground level so that these do not present an unsightly appearance.         '

All branches of trees extending above the roadway shall be trimmed as directed by the Employer/Consultant/Engineer. All excavations below the general ground level arising out of the removal of trees, stumps, etc., shall be filled with suitable material and compacted thoroughly so as to make the surface at these points conform to the surrounding area.

Ant-hills both above and below the ground, as are liable to collapse and obstruct free subsoil water flow shall be removed and their workings, which may extend to several meters, shall be suitably treated.

Disposal of Materials

          All materials arising, from clearing and grubbing operations shall

be the property of Government and shall be disposed of by the Contractor as hereinafter provided or directed by the Employer/Consultant/Engineer.

Trunks, branches and stumps of trees shall be cleaned of limbs and roots and stacked. Also boulders, stones and other materials usable in road construction shall be neatly stacked as directed by the Employer/Consultant/Engineer .Stacking of stumps; boulders, stones etc., shall be done at specified spots with all lifts and up to a lead of 1000 m.

All products of clearing and grubbing which, in the opinion of the Engineer, cannot be used or auctioned shall be cleared away from the roadside in a manner as directed by the Employer/Consultant/Engineer. Care shall be taken to see that unsuitable waste materials are disposed of in such a manner that there is no likelihood of these getting mixed up with the materials meant for embankment, sub grade and road construction.

Safety and Environmental Activities:

         

a)     Caution Boards will be placed at the beginning and end of working site and also at risky locations.

b)    Signal man will be placed at heavy traffic locations at the time of Execution.

c)     Reflective sign boards will be placed during night near risky locations.

d)    All necessary measures shall be taken to control the disposal of all forms of waste generated by the construction operations and in all associated activities.

e)     All necessary measures and precautions shall be taken to avoid any nuisance or disturbance arising from the execution of the work.

Any other points the contractor likes to mention:

a) The manpower & machinery proposed is indicative only. The requisite quantity of resources may vary based upon site condition.

b) Any modification in execution of activity shall be done with prior information with consultant.