In modern civil engineering, prestressing technology is one of the core technologies for constructing major infrastructure such as long-span bridges, high-rise buildings, large venues, nuclear
power plants, and water conservancy hubs. Prestressed structures effectively counteract the tensile stress generated by concrete components under service loads by applying compressive stress
in advance, thereby significantly improving the crack resistance, stiffness, and bearing capacity of the components and achieving optimized material utilization. The key components for
implementing this technology are the prestressed anchoring system, which includes anchors, fixtures, and connectors.
The MAG microcomputer controlled static load anchorage testing machine is a specialized equipment for factory inspection and type testing of prestressed anchorage production enterprises,
on-site acceptance of anchorage for large-scale engineering units, and inspection of prestressed anchorage assembly parts by product quality supervision departments. The equipment consists
of a high-precision servo pump to control the oil source and microcomputer measurement and control technology, forming a fully automatic closed-loop speed control system that can accurately
control and measure the entire testing process. This testing machine is designed and manufactured in accordance with national standards such as GB/T2611-2022 "General Technical Conditions
for Testing Machines". The entire machine consists of a horizontal host, a high-pressure servo hydraulic source, a front card jack, a movable high-pressure oil source, a microcomputer
measurement and control system, etc.
1. Equipment definition
The MAG-6500 microcomputer controlled static load anchoring testing machine is a precision testing system that uses microcomputer control and electro-hydraulic servo drive. It simulates the
static anchoring conditions of prestressed steel bars (such as steel strands, prestressed threaded steel bars, etc.) in anchorages. By applying and maintaining gradually increasing static tension
until the specimen fails or reaches the specified load, the static anchoring performance of the entire anchoring assembly is measured and evaluated.
2. Core functions and testing objectives
According to the requirements of the Chinese national standard "GB/T 14370-2022 Anchors, Fixtures, and Connectors for Prestressed Reinforcement" and relevant international standards (such
as the European standard ETAG 013), this testing machine mainly completes the following key tests:
Static load anchoring performance test: to test the anchoring efficiency coefficient of the assembled components of the anchor and fixture under static load, and the total strain when reaching
the ultimate tensile force.
Fatigue performance test (corresponding module needs to be configured): Under pulse load, test the anti fatigue performance of the anchoring assembly.
Periodic load test: Simulate the performance under cyclic loads such as earthquakes.
Auxiliary tests: such as testing the internal shrinkage of anchors, testing the frictional loss at anchor ports, etc.
The ultimate goal is to verify whether the anchoring assembly meets the following key indicators:
Anchor efficiency coefficient: the ratio of the measured ultimate tensile force to the theoretical ultimate tensile force of the prestressed reinforcement. This value must be greater than or equal to
0.95 to ensure that the anchor does not fail before the prestressing tendon.
Total strain: The total elongation of a prestressed tendon under ultimate tension. This value must meet the standard requirements (usually ≥ 2.0%) to ensure that the component has sufficient
ductility and safety reserve.
Failure mode: Observe whether the failure of the specimen occurs on the prestressed steel bars outside the anchorage, that is, the ideal state of "good anchorage with broken bars".
3. Typical application areas
Pre stressing anchor manufacturer: factory inspection, type inspection, and new product development.
Third party quality inspection agency: Conduct spot checks and arbitration inspections on anchorages entering the construction site.
On site laboratories for major engineering projects, such as cross sea bridges, railway passenger dedicated lines, hydropower stations, etc., conduct on-site verification of the anchoring systems
used.
Higher education institutions and research institutes: Conduct research on prestressing technology, new material anchoring devices, and new anchoring mechanisms.
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