b-1 tender form - Maharashtra Industrial Development Corporation

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90 Item No 21 Providing and laying in position plain cement concrete using granite or black trap graded metal including mixing in a mechanically operated mixer, dewatering, compacting, curing as required complete for all lifts up to a + 5 M. above or below the ground level where concrete is proposed, including shuttering using ordinary Portland cement. b) In 1:3:6 proportion. 1.1 General : The item pertains to providing and laying in position Plain Cement Concrete (PCC) of specified proportion. The work includes providing all material, mixing, compacting, curing, shuttering, dewatering etc. complete up to lift of ± 5 m. 1.2 Material: 1. Cement : Ordinary Portland Cement (OPC) as specified at item Gen/C/0.2.1. 2. Fine Aggregate (Sand) : specifications shall conform to item Gen/C/0.2.2. 3. Coarse Aggregate : specifications shall conform to item Gen/C/0.2.3. Grading and maximum size of coarse aggregate shall be as specified in the drawing. Normally the maximum size should not be more than 40 mm or 25 % of the minimum dimension of the member, whichever is less. 4. Water : specifications shall conform to item Gen/C/0.2.4. 1.3 Mix Proportion and Mixing : The mix proportion as specified on the drawing, separately for each component shall be provided. For detailed specifications refer to item No.Gen/C/0.5. For mixing without mechanical mixer, prior permission from the Engineer-in-charge shall be obtained. Specifications for mixing shall conform to item Gen/C/0.7. 1.4 Formwork and Scaffolding : Formwork shall be provided for giving the desired shape and sizes for the PCC as per the drawings. The specifications shall conform to item Gen/C/0.19.7. The striping time also shall be as specified in the item. The scaffolding shall be normally provided of steel tubes. The specifications for scaffolding also shall conform to item Gen/C/0.19.8. 1.5 Transportation, Placing and Compaction : Specifications shall conform to item Gen/C/0.8. 1.6 Field Tests : The appropriate field tests as directed by the Engineer-incharge shall be carried out as explained in item Gen/C/0.15. 1.7 Inspection & Testing of Structure : As per the contract conditions inspection & testing of a structure shall be carried out in accordance with item Gen/C/0.16 1.8 Finishing of Concrete : The finishing of concrete surface shall be as per item Gen/C/0.17. 1.9 Special Features : Special requirements such as Architectural shapes/ finishes, Expansion joints, Construction joints, Water stops, grouting, etc. shall be provided as shown on drawing/s and as directed by Engineer in Charge. For specifications for these the appropriate clauses of item Gen/C/0 shall be referred. 1.10 Curing : As per item Gen/C/0.14. 1.11 Item to Include : This item for providing Plain Cement Concrete (PCC) with specified mix proportion at specified locations with initial lift of + 5 m above or below ground level includes all ingredients of concrete i.e. water, cement, fine and coarse aggregates, all transportation, dewatering, tools and plants, all taxes, royalties, labour, formwork, testing, curing etc. complete. Mode of Measurement and Payment : The measurements of the concrete laid shall be taken on volumetric basis in cum. The openings shall be deducted. The unit rate of concrete per cum of specified proportion includes all the items as explained in Gen/C/0.25. Contractor. Executive Engineer(E&M).
91 Item No 22 Providing IInd class burnt brick masonry with conventional type bricks in foundation and upto plinth level including bailing out water striking out joints on exposed faces, scaffolding, curing etc. complete. b) 1:6 Cement Mortar. 1.1 General : The item pertains to providing II class Burnt Brick (BB) Masonry in specified proportion of Cement Mortar as per drawing / contract, in foundation and upto plinth level. The item covers bailing out water striking out joints on exposed faces, scaffolding, curing etc. 1.2 Material : 1. II-Class Burnt Bricks : Second Class Burnt bricks shall conform to the specifications as per Gen/D/0.2.2. Approval to samples of locally available bricks shall be taken from the Engineer-in- Charge and samples shall be preserved to compare with the supply to work site. 2. The Sand or Fine Aggregate : The sand or fine aggregate for mortar shall be natural sand, crushed stone sand or crushed gravel sand. The specifications shall conform to item Gen/C/0.2.2. Test results of the grading of sand shall be submitted to the Engineer-in-Charge for approval. The decision in accepting the sand, which has deviation from specification, is left to the Engineer-in-Charge. 3. Cement : Cement to be used shall conform to Specifications as per item Gen/C/0.2.1. 4. Water : Water shall conform to Specifications as per item Gen/C/0.2.4 1.3 Construction Procedure : 1.3.1 Cement Mortar : Cement mortar shall meet the requirements of IS: 2250 and shall be prepared by mixing cement and sand by volume. Proportion of cement and sand shall be as specified or as directed by the Engineer-in-charge or as shown in drawings. The sand being used for mortar shall be sieved. The mortar shall be used as soon as possible after mixing and before it has begun to set and in any case within initial setting time of cement after water is added to the dry mixture. Mortar unused for more than initial setting time of cement, shall be rejected and removed from the site of work. Proportioning : The unit of measurement for cement shall be a bag of cement weighing 50 kgs and this shall be taken as 0.035 cubic metre. Sand shall be measured in boxes of suitable size on the basis of its dry volume. In case of damp sand, its quantity shall be increased suitably to allow for bulkage. Mixing : The mixing of mortar shall be done in mechanical mixer operated manually or by power. The Engineer-in-Charge may however, permit hand mixing, as a special case, taking into account the magnitude, nature and location of work. The Contractor shall take the prior permission of Engineer-in- Charge in writing, for using hand-mix, before the commencement of work. Mixing in Mechanical Mixer : Cement and sand in specified proportions, by volume, shall be thoroughly mixed dry in a mixer. Water shall then be added gradually and wet mixing continued for at least one minute. Care shall be taken not to add more water than that which shall bring the mortar to the consistency of a stiff paste. Wet mix from the mixer shall be unloaded on watertight masonry platform, made adjacent to the mixer. Platform shall be at least 150mm above the leveled ground, to avoid contact of surrounding earth with the mix. Size of the platform shall be such that it shall extend at least 300mm around the loaded wet mix area. Wet mix, so, prepared shall be utilised within initial setting time [thirty (30) minutes for ordinary Portland cement conforming to IS:269] after addition of water. Mixer shall be cleaned with water each time before suspending the work. Hand Mixing : The measured quantity of sand shall be levelled on a clean watertight masonry platform and cement bags emptied on top. The cement and sand shall be thoroughly mixed dry by being turned over and over, backward and forward, several times till the mixture is of uniform colour. The quantity of dry mix that can be consumed within initial setting time of cement shall then be mixed with just sufficient quantity of water to bring the mortar to the consistency of stiff paste. 1.3.2 Brick Work : Soaking of Bricks : Bricks shall be soaked in water before use for a period that is sufficient for the water to just penetrate the whole depth of bricks as well as to remove dirt, dust and sand. Proper Contractor. Executive Engineer(E&M).
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1 MAHARASHTRA INDUSTRIAL DEVELOPMEN
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3 महारा औदयोग
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5 01 Name of work. M&R to W/S/S/ to
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11 making out the ground and keepin
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13 NOTICE TO CONTRACTORS Sealed per
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15 B-1 Form Percentage rate tenders
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17 TENDER FOR WORKS MEMORANDUM a) G
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19 Conditions Of Contract CLAUSE 1
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21 contractor to complete in which
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Contractor. 23 CLAUSE 8 : Payments
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25 any instructions in this connect
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27 specifications, drawings, design
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29 contractor shall forthwith on re
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31 m) Suitable precautions shall be
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33 hereof and in addition the contr
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35 CLAUSE 40 : The contactor shall
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37 CLAUSE 49 : Employments of scarc
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Page 41 and 42: 41 ADDITIONAL TERMS AND CONDITIONS
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Page 45 and 46: 45 SCHEDULE “A” Name of work :
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Page 79 and 80: 79 Item No 11 Providing and fixing
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Page 83 and 84: 83 34.6 Mode of Measurement and Pay
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