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Methods of Pile Load Test
Load assessments on piles are carried out on closing of twenty eight days subsequent to piles’ casting. Two sorts of assessments specifically initial as well as routine assessments, per sort of loading namely. Horizontal [lateral], vertical, as well as pull out, are carried out on piles.
Preliminary/Initial Load assessments on Piles: That assessment is carried out to verify the design load computations as well as to offer instructions for forming/creating the constraints of recognition/acceptance for routine assessments.
It even offers a concept of the appropriateness of the piling arrangement/system.
Preliminary/Initial assessment on piles is to be conducted at 1 or additional sites as per the quantity of piles needed. Load utilized for the preliminary [cyclical] load assessment is two point five times the pile’s safe carrying capacity. Moreover, loading with regard to/for preliminary/initial assessments is carried out in accordance with Appendix ‘A’ Clause 6.3 of IS-2911 Part IV.
Routine Load assessments on Piles: Choosing/selection of piles with regard to the Routine Assessment/Test is conducted in accordance with quantity of piles needed depending on utmost of half % of overall quantity of piles needed.
The quantity of assessments/tests might be enhanced to two percent as per the kind / sort of structure.
The assessment/test load utilized is one and a half times the pile’s safe carrying capacity. The set/Maintained load technique as explained in Clause 6.2 of IS-2911 (Part IV) – 1985 must be complied for loading with regard to the Routine assessments.
The assessment is going to be carried out for the subsequent objectives:
- To safeguard the piles’ safe load capacity
- Identification of somewhat uncommon performance compared to the identifications of the preliminary/initial assessment/test.
The assessments must be conducted at the cut-off level simply/merely. A comprehensive document/report for the assessment outcome is set.
Pile Head: The pile head/top must be break off/come off/chipped off until sound concrete is attained/met anywhere relevant. The reinforcement must be cut as well as head levelled with Plaster of Paris. Moreover, a bearing plate along with a gap must be positioned on the top/head for the jack to set/situate/rest.
Load application: It must be utilized as described as per the sort of assessment [routine / preliminary].
Every load must be kept until the pile top’s displacement rate is whether 0.1 mm in the initial thirty minutes or 0.2 mm in the initial 1 hour or two hours either happens initially.
The subsequent increase in the load must be utilized on accomplishing the abovementioned condition. The assessment load must be kept for twenty four hours.
Article Source: engineeringdiscoveries.com
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