Measurement of driven shell piles.(explained)

Driven shell piles are measured under work section D30:2 of SMM 7 and BESMM 2 or 3

Definition rule
Driven shell piles are piles in which casings are driven to depths, filled with concrete and the casings finally withdrawn. The design loads are expected to be carried by the concrete section and not the casing. 
It is wrong and unacceptable to measure these piles under work section D30:20.1(filling hollow piles)

Unit of measurement, and Work section code. 
There are three (3) major measurement items for every type/kind of driven shell pile to be measured, apart from other ancillary items. 
1. Total number, stating the commencing surface (nr) - D30:2.1.1.(1-4)
2. Total concreted length (m) - D30:2.1.2.(1-4)
3. Total driven length, stating the maximum length (m) - D30:2.1.3.(1-4)
It is mandatory to measure all these three items. 

Description in the BOQ 
For each of the measured items the following are expected to be given in the descriptions 
1. Nominal diameter of the piles
2. Kind and quality of materials 
3. Mix ratio details 
4. Kind of pile (preliminary piles, contiguous piles, raking piles etc)
For a more detailed and professional BOQ, further information such as tests, grout type, compacting details and the likes may be added to the description.

Measurement rule
The driven lengths must be measured along the axes of the piles from the commencing surface to the bottom of the casings. 

Coverage rule
Excess concrete within the total concreted length is deemed to be included in the measurement, and should not be measured again. The estimator is expected to take this into account during rate build-up. 

~ coinloorke 06122012.
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