Accreditations

A method of measuring the difference in alignment between a first plan position of an element and a second plan position of an element. The method comprises the use of: i) at least one rigid or taut connection extending between a first point at the level of the first plan position and a second point at the level of the second plan position, the first and second points being at an identical displacement from the element; and ii) one or more electrolevel gauges provided on the or each rigid or taut connection, so as to measure the inclination of the rigid or taut connection. A system is also disclosed for positioning an element within a borehole to adjust its alignment using upper and lower positioning means.

 Withers & Rogers LLP

(Applies to: Piling using Cemloc®-VL and Cemloc® datasheet)

An apparatus and method for placing an element, such as a steel column or concrete section, into a pile shaft during top-down construction techniques. The apparatus is provided with an upper and lower positioning means which allow the plan position of the element at upper and lower levels respectively to be adjusted. The advantage of the invention is that the positioning means are joined by means of a non-rigid connection which allows the length of the apparatus to be adjusted so as to suit the specific requirements of a particular operation.

Withers & Rogers LLP

A method of monitoring subsurface concrete structures, in particular a method of monitoring subsurface concrete structures during hydration of the concrete. 

Withers & Rogers LLP

Applies to: Underreaming)

The present application describes earth boring tools having a cutting means for enlarging a portion of an underground shaft. The tool may be provided with means to control the rate at which the cutting means is operable to perform a cutting action on the walls of the bore. The cutting means may be provided on one or more digging arms of the tool and means may be provided for controlling the extent of the radial projection of the digging arm from the tool. 

A detachable base plate is also described.

 Withers & Rogers LLP

(Applies to: Rotary) 

A device for recovering a detachable base of a soil working tool from the bottom of a hole, the device comprising a releasable clamping tool which is adapted to engage a pin formed on the base when the clamping tool is lowered on to the base.  The invention also relates to a detachable base per se, and a method of operating a soil working tool including clamping and withdrawal of the detachable base form a bore hole by means of a clamping tool.

Withers & Rogers LLP

The present invention relates a safety system for a drilling rig.  An optoelectronic boundary delimits a safety zone remote from the drill at a distance which is considered to provide a degree of operator safety when the drill is in operation.  In use, the safety system is intended to detect operator movement across the optoelectronic boundary and generate a cut-off signal to immobilise operation of the drill in response thereto

Withers & Rogers LLP