Definition
Anchor cable push and pull force gauge is a special measuring instrument used to measure and verify the axial thrust or pull force of anchor cables or similar components in anchor systems. It is usually composed of a bearing frame, a hydraulic or mechanical loading unit, a force value sensor and a display instrument, and is widely used in engineering sites to directly detect and monitor the anchoring force to ensure the reliability and safety of structural anchoring.
How it works:
The instrument works on the principle of force balance and sensing. When the anchor cable is subjected to an axial load, the instrument exerts or bears a reverse force on the anchor cable through the loading unit, which is converted into an electrical signal by an internal pressure sensor or strain gauge sensor. After processing, the signal is output in real time on the display unit, and its force value calculation can refer to the following basic relationship:
F = P × A
where F represents the measured force value, P is the system pressure, and A is the effective area of the hydraulic cylinder. For electronic instruments, the force value is usually output directly and linearly by the calibrated sensor.
Measurement method
The measurement process generally includes instrument installation, pre-loading, formal loading, and data reading. First, the instrument is securely installed between the anchor cable and the bearing structure to ensure alignment. Slowly apply the load by hand or electric pump to smoothly rise the force value to the target test value and record the reading in a steady state. The test can be performed with a single or cyclic load according to the relevant standards to evaluate the stress performance and creep characteristics of the anchor cable.
Influencing factors
Measurement accuracy is influenced by various factors. The calibration status of the instrument, sensor sensitivity, and temperature drift can affect the accuracy of the readings. Poor installation alignment can introduce eccentric loads, leading to measurement deviations. Loading rates that are too fast can have dynamic effects that make readings unstable. The site environment such as temperature fluctuations, vibration and electromagnetic interference can also interfere with electronic signals. In addition, the flatness and clamping method of the contact surface between the anchor cable and the instrument will also affect the value transmission.
Applications:
Anchor cable push and pull force gauges are mainly used in civil engineering, mine support, slope stabilization, foundation and structural reinforcement and other fields. In tunnel and roadway support, it is used to detect the preload and working load of anchor rods or anchor cables. In slope anchoring engineering, it is used for acceptance testing and long-term monitoring. In the uplift test of foundation bolts, it is used to verify the design bearing capacity. It is also commonly used for installation verification and regular inspection of bridge cables, cable membrane structures and heavy equipment anchoring.
Key points of selection
When selecting a model, it is necessary to comprehensively consider the measurement range, accuracy level, structural form and use environment. The measurement range should cover the expected maximum load with a certain margin. The accuracy level needs to meet the requirements of the corresponding testing standard, which is generally divided into multiple levels. According to the site space and installation conditions, choose the appropriate size and structure model, such as center through-hole type or bypass type. In harsh environments, attention should be paid to the protection level and durability of the instrument. In addition, the data output method, whether it has wireless transmission function and the analysis ability of supporting software are also aspects worth paying attention to in modern selection.