In many applications, Caltrans and other inspectors on a job like this or a pile testing application, require the load test to be held for a sustained period, in some cases up to 24 hours. C. H. Bull uses locking collar jacks for this and other applications requiring a load to be held for long periods of time.
Stan Sheppard, our high tonnage jacking specialist, brought to the test site a jacking system consisting of 2 – 100 ton calibrated locking collar jacks, a pump, a manifold with a calibrated gauge, and hoses. The system was put in place and the required load, per Caltrans, was put on the system and held for a 24 hour period. The clamps successfully passed the test and were then used by JF Shea for the Caltrans job.