Scope of Services:

Original scope was for installation of 142 no. 600mm dia. and 110 no. 900mm dia. cast insitu concrete piles up to 25m in length. As the designs for each structure were finalised the number of piles was substantially increased and a total of 360no. 600mm piles and 161no. 900mm piles were installed at the site. The scope also included a 600mm diameter test pile and load test to 250Tonnes and integrity tests on all piles. 

Location: Bugolobi, Kampala, Uganda 

Completion Date: February 2016 

Main contractor: Roko Construction Ltd. 

Client: National Water and Sewerage Corporation (NWSC) 

An upgrade to the waste water treatment plant close to the centre of Kampala, servicing the Nakivubo channel features a number of tanks and processing buildings in the swampy ground. A total of 21 structures were piled. 

A 600mm test pile was installed and tested. Four 600mm anchor piles were installed to provide the reaction. At twice the working load the pile deflection was measured as just 7mm. The designer was satisfied that this confirmed the suitability of the design and the work commenced. 

EAP mobilised two CFA piling rigs to the site in Kampala for the execution of these works. Concrete was provided by the client’s own batching plant located in central Kampala. 

Reinforcement cages are made at the client’s yard and delivered to site as required. EAP supported the main contractor for an extended period as they struggled to provide working platforms in the low-lying wetland. As the piles were completed they were cropped to the cut off level and tested for integrity on a structure by structure basis. 

The cropping was performed with EAP’s excavator slung hydraulic pile cropper and the integrity test was via the frequency response method using a TDR2 machine.