Laying. Brick work shall be laid in English bond, unless otherwise specified. Half or cut bricks shall not be used except where necessary to complete the bond. Closures in such cases, shall be cut to the required size and used near the ends of the walls. In case of exposed brick work, only selected bricks of the specified class shall be used for the face work. A layer of mortar shall be spread on full width over a suitable length to the lower course. Each brick shall be properly bedded and set home (in position) by gently tapping with handle of trowel or wooden mallet. Its inside faces shall be buttered with mortar before the next brick is laid and pressed against it. On completion of a course all vertical joints shall be fully filled from the top with mortar. The walls of the structure shall be raised truly to plumb. All courses shall be laid truly horizontal and all vertical joints shall be truly vertical. All vertical joints in alternate courses shall come directly over the other. The thickness of the brick courses shall be kept uniform and for this purpose wooden straight edge with graduations indicating thickness of each course including joint shall be used. The height of window xxxxx, bottom of lintels and other such important points in the walls shall be marked on the graduated straight edge. The wall faces front and back, more than one brick thick shall be kept in proper plane. All the connected brick work shall be more than one meter below the rest of the work. In the opinion of the Engineer-In-Charge if it is not possible, the work shall be raked back according to bond (and not toothed at an angle not steeper than 45. In one day not more than one meter high brick work should be done. All the iron fixtures, outlets of water, hold fasts of doors and windows, which are required to be built into the walls shall be embedded in mortar or cement concrete as specified in their correct position, as directed by the Engineer-In-Charge, as the work proceeds. The flue of the chimney shall be plastered with mud, cowdung mortar ( 3 mud: 1 xxxxx) as the work proceeds. No extra payment shall be done for it.
Laying. (i) All cast iron pipes and fittings shall be joined with best quality soft pig lead, which shall be free from impurities. In wet trenches joints shall be made from lead wool. Nothing extra shall be paid for lead wool joints. Depth of the pig lead and weight for joints shall be as given in this section above. · The spigot of pipe fittings shall be centered in the adjoining socket by caulking. Sufficiently turns of tarred xxxxxx will be given to leave unfilled depth of socket for depth of 45mm when the xxxxxx has been caulked tightly barrel and against the face of the socket. Molten pig lead shall than be poured to fill the remainder of the socket. The lead shall then be solidly caulked with suitable tools and hammer weighting not. · For lead wool joints the socket shall be caulked with xxxxxx xxxxxx, as explained above. The lead wool shall be inserted into the sockets and tightly caulked home skein with suitable tools and hammer of not less than 2 kg weight until joint is filled. Testing: All cast iron pipes for drainage shall be tested to a hydraulic test of 3- meter head. Test for straightness shall be same as for stoneware pipe. A test register shall be maintained which shall be signed and dated by the Concessionaire, and representative of the Independent Engineer.
Laying. (i) All cast iron pipes and fittings shall be joined with best quality soft pig lead (conforming to IS 279-1977) which shall be free from impurities.
Laying. The stone shall be laid by hand closely together. The stone shall be carefully bedded and tightly wedged with suitable spalls. The base of the stone shall alternate with the apex in all directions or as directed by the Engineer. The layer shall be proof rolled with a loaded scrapper or truck with a minimum axle load of 8 tonnes in the presence of the Engineer who shall approve of its stability before compaction.
Laying. Cement concrete layer of specified proportion and thickness shall be laid. The surface of brick / concrete shall be levelled and prepared before laying the cement concrete. Edge of damp proof course shall be straight, even and vertical. Side shuttering shall be strong and properly fixed. The concrete mix shall be of workable consistency and shall be tamped thoroughly to make a dense mix. There shall be no construction joint in the damp proof course. Curing Damp proof course shall be cured for at least seven days, after which it shall be allowed to dry.
Laying. The item to includes all labour , materials, tools, scaffolding unless specified etc. necessary to complete the works as per drawing or as directed by the Engineer-In-Charge. Rubble is placed vertical with broad based at bottom. The gaps shall be filled with smaller stones and compacted properly.
Laying. The stone shall be wetted before laying. The framing (about 200mm wide) shall be made by using 2 No. strips of suitable size stuck together with adhesive chemical to form a rebate of minimum 100mm for sliding and openable windows while one strip for Fixed ventilators/ Louvered windows. Laying / fixing of window framing shall be as described under - Marbles/ Granite flooring specifications. In case spans are more, where so desired the stones shall be secured to each other by means of copper pins 75mm long and 6mm diameter or as specified or as directed.
Laying. Cement, sand and stone chips shall be mixed properly in a mechanical mixer in such a manner as to avoid loss of water. The concrete shall be mixed for minimum period of 2 minutes or until it is of even color and uniform consistency throughout. As soon as the concrete is mixed it should be removed to the work in iron vessels as rapidly as practicable. The concrete laid will be vibrated for compaction by vibrators. Slum test will be carried at site during execution of work and confirm to IS – 456 – 2000.
Laying. All loose materials, dirt and set lumps of mortar which may be laying over the surface on which brickwork is to be freshly started, shall be removed with a wire brush and surface wetted slightly. Bricks shall be laid on a full bed of mortar. When laying, the bricks shall be properly bedded and slightly pressed with handle of trowel so that the mortar can get into all the pores of the brick surface to ensure proper adhesion. All the joints shall be properly flushed and packed with mortar so that no hollow spaces are left. Care shall be taken to see that the required quantity of water is added to the mortar at the mixing platform to obtain required consistency. Addition of water during laying of the course shall not be permitted. In the case of walls two bricks thick and over, the joints shall be grouted at every course in addition to bedding and flushing with mortar. Bricks shall be laid with frog up. However if the top course is exposed, bricks shall be laid with frog down. Care shall be taken to fill the frogs with mortar before embedding the bricks in position. All quoins shall be accurately constructed and the height of courses checked with storey rods as the work proceeds. Acute and obtuse quoins shall be bonded, where practicable, in the same way square quoins; obtuse quoins shall be formed with squint showing a three quarter brick on one face and quarter brick on the other.
Laying. Before lowering the pipe, the trench section shall be got approved from the Engineer in charge. Trenches are to be dug to the specified level / grade. Sufficient cushion shall be provided for protection from surface traffic, future changes in the ground elevation. The width of the trench shall be to the required specifications providing room for pipe laying operation, backfilling, compaction etc., Trenches should be shored and braced when conditions so warrant. The bottom of the trench shall form a continuous bed for the pipe. Where rock is encountered, trenches shall be dug deeper and then filled and compacted to grade with suitable bedding material. The Contractor shall have to provide and maintain sight rails and boning rods wherever required till the completion of work. The pipe shall be laid in reasonably dry condition and under no circumstances they shall rest on slushy bedding. The pipes shall be lowered slowly into the trench by means of chain pulley block and tripod stand or with the help of ropes and suitable size of wooden bullies or with the help of cranes. They shall be brought to the required level by giving packing with wooden sleeper pieces and ultimately with well-consolidated hard moorum if required. The chain pulley block and tripod stand must be approved from the Engineer in charge. Under no circumstances pipe shall be allowed to be thrown in the trenches. At the end of each day, the end of the pipe should be plugged to prevent entry of rodents, foreign substances, water etc.
