A Brief Discussion on the Application of KPM in Engineering Projects
A Brief Discussion on the Application of KPM in Engineering Projects
1.KPM is commonly used in the field of construction:
Used for measuring and monitoring structural deformation of buildings, such as measuring bridges
Settlement and deflection of buildings, wall cracks, etc.
working principle:
Resistance sensor: uses the resistance value to change with displacement.
Common resistive sensors include sliding resistors.
The sliding resistance sensor measures displacement by measuring the change in contact area between the sliding contact and the resistance element.
KPM is currently our best-selling product, widely used in various industries such as construction and racing. At present, the standard configuration is an 18mm diameter, M4 double fish eye design. If customers have requirements, M5 bars and M5 double fish eyes can be made. In addition, the diameter of the pole is larger by 22mm. The working principle is relatively simple, with fixed fisheye at both ends and a sliding lever to generate numerical values.
The principle of sliding rheostat can currently achieve a maximum stroke of 600mm, but it is not recommended as the stroke is too long and the diameter is small, which can easily cause damage. Last time, my client requested a 600mm KTC Pisces Eye trial. The current shipment is 550mm.
working principle:
Linear sensors typically use principles such as resistance, inductance, capacitance, or Hall effect to measure displacement. The basic principle of linear sensors in crack gauges is to estimate the length or propagation of cracks by measuring the width of the crack or the corresponding displacement on both sides of the crack
An example is the use of linear sensors for crack gauge measurement in bridge structures. Sensors can be installed at critical locations on bridges, such as beam column connections or beam sides. When cracks appear in the bridge, the deformation of the cracks will cause the position of the sensors to change, and the relevant displacement sensors will measure this change and transmit it to the data acquisition system or monitoring equipment through signals. In this way, engineers can analyze the data measured by sensors to determine the propagation of cracks and take appropriate measures to repair and maintain the structural safety of the bridge.
KPM is commonly used for crack meters, which fix the fish eyes at both ends on both sides of the crack to be measured. When the cracks in the wall/bridge increase, the sensor stretches, causing a change in resistance and generating numerical values.
3. Application of KPM in prestressing
What is prestressing?
Prestressing is a technique that enhances the bending strength and load-bearing capacity of structural materials by applying pre applied forces. Linear sensors can be used to monitor the force or strain applied by prestressed materials to ensure the safety of the structure and the accuracy of prestressing. (Simply put, it means simulating the rigidity of the testing structure to ensure the safety of the project)
How to use it?
During the prestressing process, linear sensors can be used to measure the force or strain of tensioned steel strands. They can be installed on tensioning equipment or joints to monitor changes in the force of the steel bundle during the tensioning process. By monitoring the tension force in real-time, engineers can ensure that the prestressing of the steel tendon meets the design requirements and can quickly detect any possible problems, such as stress imbalance or material fracture.
Generally, our KPM sensor is used for prestressing, which is installed on the outside of the hydraulic jack and fixed at both ends within the red frame. When the steel bars are tightened, the jack cover will lift upwards, causing displacement changes and changes in sensor resistance values.
The schematic diagram is shown below: Steel strands pass through concrete, pass through jacks, and continuously apply pressure on beam components. After applying pressure, the internal steel strands will undergo bending deformation. At this time, it is necessary to straighten the steel strands to make the concrete uniform and better stressed, thereby ensuring the safety and stability of the structure. The function of the sensor is to detect the deformation of the internal steel strand, and reaching the expected value indicates that the steel strand has been straightened, with better load-bearing capacity and stronger rigidity.
