APPLICATION OF MAGNETIC EXTENSOMETER IN EXCAVATIONS


The magnetic extensometer is a system which is used for examining the settlement and heave in foundations, digging and barriers. Settlement occurs at the depth or the position and is identified there. It is there only where the settlement is measured.
The soil extensometer incorporates magnetic targets that are placed so that they can move freely outside the access case or inclinometer case which is flush joined. The 3 or 6 Leaf Spider, magnetic settlement plates or magnetic joints can be the targets.
The relative position of the magnetic targets is used for measuring the settlement. This is done by using a Reed Switch Probe which helps in identifying the magnets which are lowered down through the central access casing.
Features
This device helps in the total and the progressive settlements too. The Following are the characteristics of a magnetic extensometer that are used in the task of excavation.
Convenient handling
As an alternative to the measuring tape, the magnet extensometer uses a graduated cable which is very easy and convenient for handling. It also winds up very easily. The diameter of the cable is 3.5 mm or 0.125”. It has a pair of steel conductors for the better stability of the dimension. The cable jacket is made up of polyurethane which is extremely flexible and has very high resistance power against abrasion.  A laser marks the graduation on the cable jacket. These are durable just like the cable jacket is.
Precision
The readings are repeated to +/-3 mm or +/- 0.1 inches. By constructing a reference stand that comprises a Vernier dial gauge, a great level of precision can be achieved.
Application
The magnet extensometer is used for examining the settlement and heave in the digging, foundations, dams, and embankments. This device can also be fixed at the back of the retaining structures like sheet piles and slurry walls, over the ground openings like tunnels and shafts. Information from the device can be used for signifying the depths at which the settlement has occurred and even the total amount of settlement is recorded through this device.
Installed components
The components which are already installed in the device are access pipe, datum magnet, spider magnet, plate magnet and various telescoping sections.
The datum magnet is located at the end of the tube which sets a benchmark. Measurement of all the other anchors is provided to those benchmarks for the calculation of the absolute settlement of every anchor point.

Comments

Post a Comment

Popular posts from this blog

Advantages of Universal Testing Machine

The main advantage of investing in a universal testing machine is that the device can be used to test the strength, durability, and suitability for most any material. A universal testing machine has the capability to pull, compress, bend, or stretch material to its breaking point. It is primarily used by laboratories that manufacture and or mould different types of plastics. A universal testing device features one or two vertical columns mounted on a base. A second horizontal plate contains attachments that are used to hold the sample and slides up and down during stress testing samples. Dual vertical column machines are preferred by most laboratories as they can handle larger samples in terms of size and weight. Determining tensile strength is the most common test performed in a universal testing machine. This is done by holding one end of a sample in place while the other is pulled away until two sides are torn apart. The same process is used for testing flexural str
Read more

Uses for Universal Testing Machine

Universal testing machine or UTM is aptly named as it can perform various types of tensile and compression tests on different materials. There are also many different terms used to refer to a UTM that you will commonly hear in the industry, among the most popular of which are a tensile tester, bend tester, and compression tester. Some types of UTMs are stripped of some capabilities and/or are marketed to specific sectors, like texture analyzers for food, peel tester for adhesives, labels, and tapes, and top load compression tester for pipes and packaging. True UTMs can perform all of these and more. They are great multi-purpose instruments for any QC or R&D laboratory. The following are only a few common uses for UTMs: Tensile testing – One of the most common applications for UTM, a tensile test measure how strong a material is, how long it can stretch, and how stiff it is as the material is pulled apart until breaking point. Compression testing – Compr
Read more

Precautions to Be Taken While Using a Piezometer

The piezometer is a measuring device that determines pore pressures underground and liquid pressure. By determining pore pressure, you can understand the behaviour of the ground before, during, and after a construction project. Certain precautions must be taken when using a piezometer to ensure proper usage and the accuracy of results. Here are some of them: Have the right equipment – Invest in a state-of-the-art piezometer that uses a proven method of converting fluid pressures on the sensitive diaphragm into frequency signals which are ideal in the demanding environment common with civil engineering applications. Modern piezometers are capable of long distance signal transmission without degradation. They can tolerate wet wiring conditions and resist external electrical noise, too. Some manufacturers make piezometers specific for different applications, for instance, you should be able to find one with a heavy-duty body that can be b
Read more