Kentledge arrangement in civil engineering is the provision of a static load for backweighting or counterweighting purposes, especially in construction work, for example in driving piles and testing their effectiveness. The kentledge apparatus can be used to exert about 1½ times the load which the pile will bear in use, in order to show that it is adequate for the purpose.
At the present time, a number of methods are used to provide a static site load or kentledge facility. These commonly include the following:-
- (i) Concrete kentledge blocks built upon a grid of fabricated steel beams.
- (ii) Soil anchors either in the form of soil screws or deep embedded plates.
- (iii) Rock anchors drilled and grouted into the underlying bedrock.
- (iv) Tension piles where the "pull-out" value of the piles is mobilised.
- (v) Sectional water tank load supported by a rigid steel framework.
Method (i) is common but extremely costly due to the difficulties of transportation, handling, and erecting of the heavy blocks involved and the time taken to do so. For example, the blocks have to weight about 200 tons if a 200 ton force is to be applied. these Methods require specialist contractors like us to carry out the work using costly tools and procedures and again the time taken to accomplish this is considerable. Method (v) has the disadvantage that the value of the load capable of being achieved is not high nor can it, in practical terms, be easily increased
there are two types in the axial compression test:
- Initial load test
- Routine load test