Classes of Excavation. Delete the contents of this clause and replace with the following:
(a) Soft excavation All material which can still be efficiently excavated (in the opinion of the Engineer) by 30t excavator fitted with 'rock bucket' (excavator bucket typically fitted with not more than 3 tines designed to loosen layered weathered solid sedimentary residual material). This includes both soft soil material and weathered and fractured sandstone.
(b) Hard Excavation / Hard Rock All partially weathered / unweathered sandstone material (in the opinion of the Engineer) which would normally be drilled and blasted if allowed:
1) Using Heavy Duty hydraulic breaker (albeit at a much slower rate of production than intermediate above);
2) Hard Rock excavation by drilling and pouring-in expanding grout: All material where Engineer agrees cannot reasonably be broken-out by 30t heavy duty hydraulic breaker alone due to access difficulties or extreme hardness. Any unweathered boulders encountered shall be classified as ‘Hard Rock: excavation by hydraulic breaker or expanding grout (as agreed with the Engineer)’ where such boulders exceed 0,125m3 (approx. 500 x 500 x 500mm) in volume. Boulders smaller than this size shall not be classified.
Classes of Excavation. Add the following: “The excavation of material from cut or borrow for fill (including excavations in existing roads where specified or agreed) shall be classified as either soft excavation or hard excavation. All intermediate excavation shall be classified as soft excavation and the rate for soft excavation shall include the cost for intermediate excavation.”
(a) REMOVING UNSUITABLE MATERIAL B3305I: PREPARING AND COMPACTING THE ROADBED
Classes of Excavation. Delete the contents of this clause and replace with the following: “For this contract, the classes of excavation will be subdivided as follows:
Classes of Excavation. Delete the contents of this clause and replace with the following: “For this contract, the classes of excavation will be subdivided as follows:
(a) Soft excavation Soft excavation shall be excavation in all materials and boulders which in the opinion of the Engineer can be efficiently excavated and loaded by a 30t excavator fitted with 'rock bucket' (excavator bucket typically fitted with not more than 3 tines designed to loosen weak rock material).
Classes of Excavation. For this contract classes of excavation will be subdivided as follows:
(a) Soft excavation, being all excavation other than material classified as hard excavation as defined below.
(b) Hard rock excavation, except that for this contract boulder excavation will normally not be measured as stated in the payment clause 8.3.2(b). Boulders of such a size that they cannot be removed without drilling, wedging and splitting, or other mechanical means, shall be measured individually and will be regarded as hard rock excavation. PSD-3.3 Selection
Classes of Excavation. The excavation of material will be classified as follows, for purposes of measurement only:-(a) Soft Excavation.
(1) Soft excavation", other than in "restricted excavation", shall be excavation in material that can be efficiently dug out, or loaded, without prior ripping, by any of the following plant:-(i) a bulldozer of mass [including mass of ripper, if fitted] approximately 22-metric tons and flywheel power approximately 145kW, or (ii) a tractor-scraper unit of total mass [including mass of ripper, if fitted] approximately 28-metric tons and flywheel power approximately 245kW, pushed during loading by a bulldozer equivalent to that specified in (b) (1) hereunder, or (iii) a track type front-end loader of mass [including mass of ripper, if fitted] approximately 22-metric tons and flywheel power approximately 145kW.
(2) In the case of restricted excavation, "soft excavation" shall be excavation in material that can be efficiently dug out by a back- acting excavator of flywheel power approximately 0.10 kW per millimetre of tined-bucket width, without the use of pneumatic tools such as paving-breakers.
(b) Intermediate Excavation.
(1) Intermediate excavation", other than in "restricted excavation", shall be excavation in material that can be efficiently ripped by a bulldozer of mass approximately 35- metric tons, fitted with a single-tine ripper suitable for heavy ripping and flywheel power approximately 220kW.
(2) In the case of restricted excavation, "intermediate excavation" shall be excavation in material that requires a back-acting excavator of flywheel power exceeding 0.10 kW per millimetre of tined-bucket width, or the use of pneumatic tools such as paving-breakers, before removal by equipment equivalent to that specified in (a) (2) hereinbefore.
(c) Hard Rock Excavation.
(1) Hard rock excavation", other than in "restricted excavation", shall be excavation [other than "boulder excavation"] in material that cannot, before removal, be efficiently ripped by a bulldozer equivalent to that specified in (b) (1) hereinbefore. NOTE: Such excavation generally includes material such as formations of unweathered rock that can be removed only after blasting, or wedging and splitting.
(2) In the case of restricted excavation, "hard rock excavation" shall be excavation in material [excluding boulder excavation] that cannot be efficiently removed without blasting, or wedging and splitting.
(d) Boulder Excavation Class A.
(1) Boulder excavation class A", shall be ex...
