Testing Equipment

Multi function detector of prestressed concrete beam

Profile information:
Testing objects: bridges, tunnels, dams, ports and other concrete structures Testing Content: Concrete Material: Elastic Modulus, Compressive Strength, etc. Structure Size: Thickness Apparent Defects: Fracture Depth and Surface Degradation Internal defects: void, internal void, looseness, etc.
basic information
Device name
Multi function detector of prestressed

Qualitative test

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.


Test items


product description


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


Good reliability


No damage to the structure


1 Sampling period: 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4 UGS adjustable
2 operating system:windows
3 Waveform Noise Processing and Spectrum Analysis: Mobile Smoothing、BPF、EMD、 FFT、MEM
4 Test Contents: Grouting Quality; Effective Prestress under Anchor, Suspension Tension; Concrete Material (Elastic Modulus, Strength) and Size
5 Testing methods of grouting compactness: longitudinal qualitative (FLEA, FLPV, PFTF), vertical positioning (IEEV, IERS), vertical and horizontal channels (VDFM)
6 Equivalent mass method for testing effective prestressing force under anchorage(TTEM)
7 Signal Processing Technology: Eliminating Residual Signal of Excitation; Integral Processing and Average Processing
8 Grouting Positioning Coupling: High Damping Sensor Support
9 Channel number: 2 channels (VMC technology can be extended to multiple channels), trigger channels and receive channels are interchangeable
10 Platform: Integrated Platform
11 Testing method of free chord tension: chord vibration method
12 Testing method of concrete material and size: reflection method
13 Test range of grouting compactness: Qualitative test can reach 150 m; Location test is not limited by the length of channel.
14 Test Range of Concrete Material and Size:0.1-2m
15 Data acquisition: support touch, wireless dual mode; support single, continuous dual mode sampling
16 working temperature:0~45℃     
17 Sampling accuracy: floating-point interpolation compensation to 24 bits
18 Sampling frequency: 500KHz, adjustable        
19 Maximum acquisition points: 20,000, adjustable
20 Maximum/Minimum Voltage Display:10V/0.0001V
21 Display: LCD 1280*800                                                         
22 Graphic Processing: Isogram, Concentration Map, Elastic Wave Radar Scanning
23 On the same screen, the maximum number of waveform bars is 300 (waveform acquisition points 2048, sampling interval 4us)
24 Location information: supporting GPS positioning






























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