Reconstruction of Protection Works for Under-Construction IPSs of UEED by way of Providing Diaphragm Walls and Retaining Walls on the Right Bank of River Tawi(Bikram Chowk Bridge-Gujjar Nagar Bridge) at i.Christan Colony, ii.Prem Nagar, iii.Jogi Gate

Protection Works around the 3 No's of IPS 1. Christian colony 2. Prem Nagar 3. Jogi Gate

Clearing the site and carry out alignment survey work by total station as and when required including marking of centre line of alignment, taking ground level details of existing structures within construction area and additional areas/lengths if required. Rate includes fixing necessary reference pillars, establishing benchmark, establishing foundation layout on ground, including submission longitudinal section, cross section, and report of survey work in three copies with soft copy in CD to Engineer‐in‐charge as directed for protection work, centreline length of survey will be measured for payment. (The average width will be approximately 250 to 300m)

Construction of 600 mm thick diaphragm wall inside ring bund above water level in R.C.C. grade M-30 of various depth. The rate includes construction of guide wall 1200 mm deep in R.C.C. grade M-15 of 100 mm thickness made from lightly reinforced concrete. Grabbing & trenching for diaphragm wall shall be carried out in all type of soil / sand / gravel, boulders by using hydraulic / mechanical diaphragm machine. Concrete should be produced in batching plant. The cost of reinforcement for diaphragm wall will be paid under saperate item. The contractor's rate should include the cost of following items:

Site clearance before starting the work and after completion of work.

Construction of guide wall in M15 grade concrete, including Earthwork in Excavation and or Backfilling. Demolishing and stacking of unused material of guide wall after completion of the diaphragm wall as directed by the Engineer. Cost of reinforcement in guide wall is included in guide wall cost.

Grabbing by approved trenching method as per IS:9103 using hydraulic / mechanical grab of suitable capacity required to overcome the strata at site. The bidder shall also take into consideration the usage of additional grab attachments like breakers, chisellers, drillers etc. for expediting the execution operations. The grabbing shall be carried out to desired depth in all kind of soil. Trenching by approved trenching hydraulic / mechanical grabbing equipment up to desired depth in all sorts of soil, bouldery strata of all size including hard and soft rock.

Concreting by tremmie in controlled concrete M30 grade including cost of all materials, polymer / bentonite, labourers, tools, plants, and equipment etc. complete.

Overflowing of contaminated concrete of 0.6m height (equivalent volume 0.36 m³ above cut-off level and simultaneous finishing the concrete at cut-off level in green state (Chipping or dismantling of contaminated concrete is not allowed instead of equivalent overflowing concrete is suggested).

The ring bund is proposed to be constructed above water level and construction of diaphragm wall is to be carried out in dry condition inside constructed ring bund excludes diaphragm area is proposed to be constructed. The cost of dewatering would not be payable to contractor.

The cost of reinforcement of diaphragm wall will be paid separately.