Falling ball tester for geotechnical mechanical properties
The method can quickly detect the tightness of the grouting of the tunnel, and test the steel strands exposed at both ends of the anchor cable.
In one test, the above three methods (FLEA, FLPV, PFTF) can be tested simultaneously, and the test time for completing one channel is within 5 minutes.
Test principle and method
Rapid qualitative detection of grouting compactness, accurate location detection of defects, and identification of defect types;
Anchor cable (rod) tension detection (filled anchor cable, buried anchor cable, empty anchor cable);
Sleeve grouting; concrete material (elastic modulus, compressive strength), wall thickness.
Sichuan Shengtuo Testing Technology Co., Ltd. provides pre-stressed concrete bridge multi-function detector. The equipment can test the density of the grouting of the tunnel, the quality of the concrete pouring (the strength and rigidity of the test piece, the strength of the test piece), the effective prestress under the anchor, the material and size of the concrete. It has the characteristics of high test efficiency, good reliability and no damage to the structure, which can greatly improve the quality assurance of the prestressed beam.
Results and technical characteristics
Based on the integration of existing advanced technologies at home and abroad, a series of test principles were proposed and a relatively complete detection system was established. The main independent research and development technologies are:
Equivalent Wave Velocity Method (IEEV): Positioning and type discrimination of grouting defects of prestressed beams;
Equivalent mass method (TTEM): testing the tension of a buried anchor/rod;
Full Length Attenuation Method (FLEA): Qualitative testing of the channel grouting density of prestressed beams;
Transfer Function Method (PFTF): Characterizes the grouting defects in the vicinity of the anchor head of the prestressed beam. According to this, not only can the effective tension of various anchor cables/rods be tested, the grouting compactness of the prestressed beams can be quickly qualitatively detected, accurately positioned and typed, and at the same time, the concrete material (structure, test piece), beam thickness It can also be tested.
1. Technical Specifications for Non-destructive Testing of Grouting Density in Prestressed Tunnels of Shanxi Province (DB14/T 1109-2015)
2. Technical specification for dense grouting quality inspection of bridge prestressed tunnels in Hebei Province (DB13/T 2480—2017)
3. Technical Specifications for Quality Inspection of Prestressed System of Highway Concrete Structure Bridges in Fujian Province (DB35/T 1638—2017)
4. Foshan City Bridge Prestress Construction Quality Control Guide
5. Guidance for the quality work of highway construction projects in Shaanxi Province
6. ASTM (American Standard for Testing and Materials): Standard Test Method for Measuring the P-Wave Speed and the Thickness of Concrete Plate Using Impact-Echo Method, ASTM-C1383-98, 1998.
According to the standard
Prestressed concrete beam multi-function detector
High test efficiency
No damage to the structure
|1||Provide database management services, and can be docked with BIM system, to achieve the visualization of test results model; with the database linkage, can carry out test results cloud AI (artificial intelligence) analysis.|
|2||Deformation Index Testing Method: Based on Hertz Impact Theory|
|4||Waveform noise processing: moving smoothing、BPF、EMD|
|5||Signal Processing Technology: Integral Processing and Average Processing|
|6||Channel number: 2 channels (VMC technology can be extended to multiple channels), trigger channels and receive channels are interchangeable|
|7||Platform: Small Integration Platform|
|8||Data acquisition: support touch, wireless dual mode; support single, continuous dual mode sampling|
|10||Working hours: continuous working for more than 8 hours (battery can be replaced)|
|11||Storage: This machine can store tens of thousands of data on its own hard disk to support expansion.|
|12||Sampling accuracy: floating-point interpolation compensation to 24 bits|
|13||Maximum acquisition frequency: 500KHz, adjustable|
|14||Maximum acquisition points: 20,000, adjustable|
|15||Maximum/Minimum Voltage Display：10V/0.0001V|
|17||Result Data Statistical Processing: Equivalent Value Computation, Simple Average, Deviation and Elimination of Abnormal Data|
|18||Graphic processing: contour mapping|
|19||Deformation Index Testing Contents: Compression Modulus and Rebound Modulus|
|20||Strength Index Testing Contents: Internal Friction Angle, Cohesion|
|21||Testing method of strength index: based on Vesic void expansion theory|
|22||Test contents of other conversion indexes: K30, CBR, deflection, dry density, compactness, etc.|
|23||Maximum test depth：0.3m|
|24||Location information: supporting GPS positioning|