GENERAL-De addiction Ward- Govt. Mental H e a l t h C e n t r e P e r o o r k a d a Thiruvananthapuram-Renovation of drainage lines and manholes in De addiction Ward- General Civil Work

Drainage lines and manholes

OD241163/2025-2026:Demolishing of brick manhole including R.C.C top slab, including stacking of useful materials near the site and disposal of unserviceable materials into municipal dumps within 50 m lead: manhole 60x60 cm and 120 cm deep

2.8.1:Earth work in excavation by mechanical means (Hydraulic excavator) /manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, lift up to 1.5 m, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50 m.All kinds of soil

50.18.9.10.1:Providing and fixing PVC pipes includings jointing of pipes with one step pvc solvent cement, trenching , refilling & testing of joints complete as per direction of Engineer in Charge. 150 mm dia 6 Kgf/cm2

OD241168/2025-2026:Constructing Concrete masonry manhole in C.C. 1:2:4 mix (1 cement : 2 coarse sand : 4graded stone aggregate 20 mm nominal size) with foundation concrete 1:4:8 mix ( 1 cement : 4 coarse sand : 8 graded stone aggregate 40 mm nominal size,) inside plastering 12 mm thick with cement mortar 1:3 ( 1 cement :3 coarse sand) finished with floating coat of neat cement and making channels in cement concrete 1:2:4 ( 1cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size ) finished with a floating coat of neat cement complete as per standard design: Inside size 60x60 cm and 30 cm (average) deep with low duty cast iron covering slab

OD241169/2025-2026:Extra for additional height of manhole with cement concrete 1:2:4 with wall thickness 15 cm for inside size 60x60cm

OD241170/2025-2026:Constructing Concrete masonry manhole in C.C. 1:2:4 mix with wall thickness 15 cm (1 cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size) wth foundation concrete 1:4:8 mix ( 1 cement : 4 coarse sand : 8 graded stone aggregate 40 mm nominal size,) inside plastering 12 mm thick with cement mortar 1:3 ( 1 cement : 3 coarse sand) finished with floating coat of neat cement and making channels in cement concrete 1:2:4 ( 1 cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size ) finished with a floating coat of neat cement complete as per standard design: Inside size 80x80 cm and up to 30 cm deep with medium duty cast iron covering slab

OD241171/2025-2026:Extra for additional height of manhole with cement concrete 1:2:4 with wall thickness 15 cm for inside size 80x80cm

15.2.2:Demolishing cement concrete manually / by mechanical means including disposal of material within 50 metres lead as per direction of Engineer - in-Charge.Nominal concrete 1:4:8 or leaner mix ( including equivalent design mix)

19.16:Providing orange colour safety foot rest of minimum 6 mm thick plastic encapsulated as per IS: 10910 on 12 mm dia steeel bar conforming to IS:1786, having minimum cross section as 23 mm x 25 mm and over all minimum length 263 mm and width as 165 mm with minimum 112 mm space between protruded legs having 2 mm tread on top surface by ribbing or chequering besides necessary and adequate anchoring projections on tail length on 138 mm as per standard drawing and suitable to with stand the bend test and chemical resistance test as per specifications and having manufactures permanent identification mark to be visible even after fixing including fixing in manholes with 30x20x15 cm cement concrete block 1:3:6 ( 1cement: 3 coarse sand: 6 graded stone aggregate 20 mm nominal size) Complete as per design

2.25:Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundation etc. in layers not exceeding 20 cm in depth, consolidating each deposited layer by ramming and watering, lead up to 50 m and lift up to 1.5 m.

4.1.3:Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level:1:2:4 (cement : 2 coarse sand (zone-III)derived from natural sources : 4 graded stone aggregate 20 mm nominal size derived from natural sources)

OD241172/2025-2026:Constructing Concrete masonry manhole in C.C. 1:2:4 mix (1 cement : 2 coarse sand : 4graded stone aggregate 20 mm nominal size) with foundation concrete 1:4:8 mix ( 1 cement : 4 coarse sand : 8graded stone aggregate 40 mm nominal size,) inside plastering 12 mm thick with cement mortar 1:3 ( 1 cement :3 coarse sand) finished with floating coat of neat cement and making channels in cement concrete 1:2:4 ( 1cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size ) finished with a floating coat of neat cement complete as per standard design: Inside size 120x120 cm and 30 cm (average) deep with low duty cast iron covering slab

OD241173/2025-2026:Extra for additional height of manhole with cement concrete 1:2:4 with wall thickness 20 cm for inside size 120*120cm

15.60:Disposal of building rubbish/ malba/ similar unserviceable, dismantled or waste materials by mechanical means, including loading, transporting, unloading to approved municipal dumping ground or as approved by Engineer-in-charge, beyond 50 m initial lead, for all leads including all lifts involved

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