drawing of the OFC. All Cable splicing and branching should be invariably done in Hand Holes. ii) Hand Holes shall be constructed as per Drawing 9.1.2 of Sectoin-9, and in the following way:- Reinforced concrete Hand Holes placed on a concrete or gravel foundation are to be used to prevent their sinking in the soil. The nominal dimensions of the Hand Hole shall be as follows: Length (inside) - 1.20 meter Width (inside) - 1.00 meter Depth (inside) - 1.00 meter Wall & floor thickness - 12.0 cm Cover slab thickness - 16.0 cm The dimensions shall have the following tolerances: a) Inside Dimensions Length : ± 2.5 cm Width : ± 1.5 cm Height : ± 1.5 cm Composition of concrete: Stone chips (20 mm downgraded): sand (Sylhet): Portland cement = 3:1.5:1 iii) All unused duct must be sealed by end cap and live duct having cable may be sealed by simple plug. iv) Outside city/town areas, the Hand Holes will be at 1km interval for straight road section and at the points of splicing, while on the zigzag road section, the Hand Hole span may be shorter considering OFC pulling tension of 2000 Newton. Also in case of long bridges (30 m or more) there will be two Hand Holes at the two ends of the bridge. All these Hand Holes shall be covered with easily removable reinforced concrete Hand Hole cover. Hand Hole cover will be made of 3 part reinforced concrete pieces for easy opening. The top surface of Hand Hole cover shall have on the cover Centre. Galvanized rack “BTCL” mark structures (2 nos. of I shape rack) of proper size have to be provided for each Hand Hole. v) Tentative numbers of Hand Hole are given in the respective BoQ forms. 7.3.3 Excavation for Hand-Hole and / or conduit. All excavation works shall be done in a thorough and workmanlike manner in accordance with the detailed drawings and the specifications under the directions of BTCL and subject to the approval and acceptance by BTCL. The Contractor will assist BTCL for obtaining road-cutting permissions from relevant
drawing of the OFC. All Cable splicing and branching should be invariably done in Hand Holes. ii) Hand Holes shall be constructed as per Drawing 9.1.2 of Sectoin-9, and in the following way:- Reinforced concrete Hand Holes placed on a concrete or gravel foundation are to be used to prevent their sinking in the soil. The nominal dimensions of the Hand Hole shall be as follows: Length (inside) - 1.20 meter Width (inside) - 1.00 meter Depth (inside) - 1.00 meter Wall & floor thickness - 12.0 cm Cover slab thickness - 16.0 cm The dimensions shall have the following tolerances: a) Inside Dimensions Length : ± 2.5 cm Width : ± 1.5 cm Height : ± 1.5 cm Composition of concrete: Stone chips (20 mm downgraded): sand (Sylhet): Portland cement = 3:1.5:1 iii) All unused duct must be sealed by end cap and live duct having cable may be sealed by simple plug. iv) Outside city/town areas, the Hand Holes will be at 1km interval for straight road section and at the points of splicing, while on the zigzag road section, the Hand Hole span may be shorter considering OFC pulling tension of 2000 Newton. Also in case of long bridges (30 m or more) there will be two Hand Holes at the two ends of the bridge. All these Hand Holes shall be covered with easily removable reinforced concrete Hand Hole cover. Hand Hole cover will be made of 3 part reinforced concrete pieces for easy opening. The top surface of Hand Hole cover shall have “BTCL” mark on the cover Centre. Galvanized rack structures (2 nos. of I shape rack) of proper size have to be provided for each Hand Hole. v) Tentative numbers of Hand Hole are given in the respective BoQ forms. 7.3.3 Excavation for Hand-Hole and / or conduit. All excavation works shall be done in a thorough and workmanlike manner in accordance with the detailed drawings and the specifications under the directions of BTCL and subject to the approval and acceptance by BTCL. The Contractor will assist BTCL for obtaining road-cutting permissions from relevant