DATA SHEET DIAGNOSTIC SYSTEMS FLAT JACK TESTING EQUIPMENT

DIAGNOSTIC SYSTEMS FLAT JACK TESTING EQUIPMENT FLAT JACK TESTING EQUIPMENT WHAT DOES IT DO Estimation of in-situ compressive stress within solid unit masonry (single-jack testing) and In situ measurement of masonry deformability properties (double-jack testing). Monitoring of stress changes in elements such as concrete lining of pre-existing tunnels. Compact and easy to carry; Compliant with RILEM recommendations. Figure 1 - Flat jack testing equipment. Device for applying the load, consisting of welded metal pockets, pressurized by means of a measuring fluid. Equipped with a fluid inlet and...

DIAGNOSTIC SYSTEMS FLAT JACK TESTING EQUIPMENT DOUBLE-JACK TESTING: The flat-jack test can also be applied to determine the deformability characteristics of a masonry. In this case a further cut is made, parallel to the first one, and a second jack is inserted, at a distance of about 50 cm from the other. The two jacks delimit a masonry sample of appreciable size to which a uniaxial compression stress can be applied. Measurement bases for removable strain gauge on the sample face provide information on vertical and lateral displacements. In this way a compression test is carried out on an undisturbed...

FLAT JACK TESTING EQUIPMENT DIAGNOSTIC SYSTEMS Although stiffer than the MP-A model, these jacks are subjected to fatigue cycles under pressure (at low loads) to optimize their behavior when put under pressure. On request, flat jacks can be made for special executions with various dimensions, shapes and thicknesses with a maximum pressure of up to 400 bar. MECHANICAL CHARACTERISTICS RECTANGULAR SPECIAL FORMAT FOR CUT-OFF MACHINE MP-A DIMENSIONS GL-A MAXIMUM WORKING PRESSURE JACK CALIBRATION A flat jack has an inherent stiffness which resists expansion when the jack is pressurized due to the resistance...

DIAGNOSTIC SYSTEMS FLAT JACK TESTING EQUIPMENT CUTTING EQUIPMENT Different cutting equipment can be used to make the slots where flat jacks are to be placed. It is important that the size and thickness of the slots are as nearer as possible to the dimensions of the flat jack being used. For our large semioval flat jacks we suggest the use of a special cutter with an eccentric rim drive system which gives very good performances in all type of construction materials. The ring blade used by such a cutter allows to obtain rather quickly semicircular cuts as deep as 260 mm in which the mentioned jacks...

FLAT JACK TESTING EQUIPMENT DIAGNOSTIC SYSTEMS MANUAL HYDRAULIC PUMP GLÖTZL PUMP MODEL M2H16 For loading the jacks and for reading them, a hydraulic hand pump is available, which Boviar commissioned from the German company Glötzl specifically for flat jacks. Even today this pump is considered by insiders to be the state of the art of hydraulic systems for placing the jacks in charge. The Glötzl model M2H16 has two class 1 precision pressure gauges (standard range: 0-25 bar and 0-100 bar). It is equipped with an exchange circuit so as to be able to use the most suitable measuring range for the...