Structural concrete strength non-breakage inspection system based on distance caliper

Abstract

The utility model discloses a structural concrete strength non-breakage inspection system based on a distance caliper. The inspection system comprises a transmitting transducer, a receiving transducer and a distance caliper, the distance caliper is provided with a plurality of test holes, and contacts of the transmitting transducer and the receiving transducer are correspondingly connected to the corresponding test holes. According to the utility model, the distance caliper made of an acrylic material is used, so that the accuracy problem of the flat measurement distance l is well solved, the influence on the sound velocity result is very small, and the final component strength presumption result is not influenced.

Description

Technical Field

[0001] The utility model relates to the field of non-destructive testing of concrete strength, in particular to a non-destructive testing system for structural concrete strength based on a distance caliper. Background Art

[0002] The ultrasonic-rebound comprehensive method for testing concrete strength is a non-destructive test method for structural concrete strength that is currently widely used in my country. It has the advantages of high precision and wide trial range compared to single ultrasonic or rebound non-destructive test methods, and is welcomed by testing units and testing personnel. According to the requirements of Sichuan Provincial Local Standard "Technical Code for Testing Structural Concrete Strength by Ultrasonic-Rebound Comprehensive Method for Highway Engineering" DB / T 51 1996-2015, China Association for Engineering Construction Standardization Standard "Technical Code for Testing Concrete Compressive Strength by Ultrasonic-Rebound Comprehensive Method" T / CECS 02-2020 and other regulations, when there is only one surface available for testing at the tested part of the structure or component, the flat measurement method can be used to measure the sound velocity in the concrete, and the ultrasonic distance l should be 350mm~450mm. In actual engineering applications, the middle value of 400mm is taken. Three measuring points are arranged in each measuring area, and the transducers are arranged as follows Figure 1 , Figure 2 At present, there is no auxiliary device to fix the test. If there is no auxiliary device to fix the test, the transducer spacing is difficult to accurately control at the value of 400mm. According to calculations, the impact on the wave velocity can reach 1 / 9, and it will affect the wave velocity and the final estimated intensity. Utility Model Content

[0003] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a non-destructive testing system for structural concrete strength based on a distance caliper; the use of an acrylic distance caliper can well solve the accuracy problem of horizontal distance measurement l, has little effect on the sound velocity result, and will not affect the final component strength estimation result.

[0004] The utility model is implemented in this way: a non-destructive testing system for structural concrete strength based on a distance caliper is constructed, the testing system comprises a transmitting transducer, a receiving transducer and a distance caliper, a plurality of testing holes are opened on the distance caliper, and contacts of the transmitting transducer and the receiving transducer are correspondingly connected at corresponding testing holes.

[0005] According to the non-destructive testing system for structural concrete strength based on a distance caliper of the utility model, the feature is that the distance caliper is an acrylic plate caliper.

[0006] According to the utility model, a structural concrete strength non-destructive testing system based on a distance caliper is characterized in that a suction cup capable of adsorbing on concrete is provided on the back of the distance caliper.

[0007] According to the utility model, a structural concrete strength non-destructive testing system based on a distance caliper is characterized in that the distance caliper has a scale.

[0008] The utility model has the following advantages: the application provides a non-destructive testing system for structural concrete strength based on a distance caliper; the use of an acrylic distance caliper in combination with a transmitting transducer and a receiving transducer effectively solves the accuracy problem of horizontal distance measurement l, has little effect on the sound velocity result, and will not affect the final component strength estimation result. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Ultrasonic level measurement schematic plan view;

[0010] Figure 2 Ultrasonic planimetric schematic elevation drawing;

[0011] Figure 3 It is the overall diagram of the inspection system of this application;

[0012] Figure 4 is a schematic diagram of the distance caliper in this application;

[0013] Figure 5 Typical example of component design strength C20 waveform (with caliper);

[0014] Figure 6 Typical example of component design strength C20 waveform (without caliper);

[0015] Figure 7 Typical example of component design strength C25 waveform (with caliper);

[0016] Figure 8 Typical example of component design strength C25 waveform (without caliper);

[0017] Fig. 9 Typical example of component design strength C30 waveform (with caliper);

[0018] Fig.10 Typical example of component design strength C30 waveform (without caliper);

[0019] Fig.11 Typical example of component design strength C35 waveform (with caliper);

[0020] Fig.12 Typical example of component design strength C35 waveform (without caliper);

[0021] Fig.13 Typical example of component design strength C40 waveform (with caliper);

[0022] Fig.14Typical example of component design strength C40 waveform (without caliper);

[0023] Fig.15 Typical example of component design strength C50 waveform (with caliper);

[0024] Fig.16 Typical example of component design strength C50 waveform (without caliper);

[0025] Fig.17 Summary of average wave velocities at different concrete strengths measured with and without calipers. DETAILED DESCRIPTION

[0026] The following will be combined with the attached Figure 1-Figure 17 The utility model is described in detail, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The ultrasonic rebound comprehensive method for detecting concrete strength is a non-destructive testing method for structural concrete strength that is currently widely used in my country. When using a plane test, the transducer spacing l cannot be controlled very accurately. In order to avoid the influence on the ultrasonic velocity, an acrylic plate is introduced as a caliper to accurately control the distance measurement. Based on this, the utility model provides a non-destructive testing system for structural concrete strength based on a distance caliper, which can be implemented in the following manner; the testing system includes a transmitting transducer 10, a receiving transducer 20 and a distance caliper 30, and the distance caliper 30 is provided with a plurality of test holes 31, and the contacts of the transmitting transducer 10 and the receiving transducer 20 are correspondingly connected to the corresponding test holes 31.

[0028] In the present application, the distance caliper 30 is an acrylic plate caliper. The use of acrylic distance calipers solves the accuracy problem of horizontal distance measurement l very well, has little effect on the sound velocity result, and does not affect the final component strength estimation result.

[0029] In the present application, a suction cup 32 capable of being adsorbed on concrete is provided on the back of the distance caliper 30, so that the caliper can be conveniently adsorbed on the concrete surface to be inspected during operation.

[0030] In the present application, the distance caliper 30 is provided with a scale.

[0031] The specific implementation of this application is further described in detail below;

[0032] 1. Data collection: In the actual measurement process, in order to eliminate the influence of human factors on the wave velocity and accurately control the transducer spacing, a transducer distance caliper is required. The caliper is required to accurately measure the distance while not affecting the working performance of the transducer, that is, not affecting the wave velocity. The working principle of ultrasonic waves is that the transmitting transducer intermittently transmits pulse waves at a certain frequency, which are received by the receiving transducer after passing through the concrete measurement area.

[0033] According to the working principle of the transducer, the distance caliper should not be too hard (if it is too hard, the ultrasonic wave may choose to propagate through the caliper) nor too hard (if it is too hard, it will not play the role of fixing the transducer). Acrylic plate was selected after comprehensive consideration. Ultrasonic tests were conducted on concrete solid components of C20 (retaining wall), C25 (concrete anti-collision guardrail), C30 (tunnel concrete lining), C35 (bridge abutment), C40 (bridge square pier), and C50 (bridge beam and slab) on Gujin Expressway. Tests were conducted in the same measurement area in two ways: "with distance caliper" and "without distance caliper". Whether the introduction of acrylic plate caliper has an impact on wave velocity was analyzed by calculation and statistics.

[0034] 2. Statistical analysis:

[0035] By collecting the strength of six common concrete components on site, the strength values ​​are C20, C25, C30, C35, C40, and C50 respectively. The wave velocity and waveform obtained by "with or without" distance caliper are sorted and analyzed to draw a conclusion on whether the distance caliper can be used in actual detection. The specific detection data are shown in Tables 1 to 6, and the waveform diagram is shown in Figures 5 to 16 .

[0036] Table 1 Results of sound velocity test when the component design strength is C20

[0037]

[0038]

[0039] Table 2 Results of sound velocity test when the component design strength is C25

[0040]

[0041] Table 3 Test results of concrete components with design strength of C30

[0042]

[0043] Table 4 Test results of concrete components with design strength of C35

[0044]

[0045] Table 5 Test results of concrete components with design strength of C40

[0046]

[0047]

[0048] Table 6 Test results of concrete components with design strength of C50

[0049]

[0050] The average wave velocity of 6 groups of concrete components measured with or without distance caliper was statistically analyzed, and the maximum deviation was 0.6%. The distance caliper had little effect on the resulting wave velocity.

[0051] Table 7 Statistics of average sound velocity test results with and without distance caliper

[0052]

[0053] By plotting the statistical results of the speed of sound with and without the distance caliper, we can more intuitively see that the two methods, with and without the distance caliper, have little effect on the speed of sound results. Fig.17 Summary of average wave velocities at different concrete strengths measured with and without calipers.

[0054] According to the sound velocity comparison and waveform diagram comparison of the "with-without" distance caliper for concrete components with different design strengths, the waveform change is negligible and the wave velocity has little effect. It can be concluded that the use of acrylic distance calipers can well solve the accuracy problem of horizontal distance measurement l, has little effect on the sound velocity result, and will not affect the final component strength estimation result.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-destructive testing system for structural concrete strength based on a distance caliper, characterized in that ； The inspection system comprises a transmitting transducer (10), a receiving transducer (20) and a distance caliper (30), wherein the distance caliper (30) is provided with a plurality of test holes (31), and contacts of the transmitting transducer (10) and the receiving transducer (20) are correspondingly connected to corresponding test holes (31).

2. According to claim 1, a non-destructive testing system for structural concrete strength based on a distance caliper is characterized in that ; The distance caliper (30) is an acrylic plate caliper.

3. A non-destructive testing system for structural concrete strength based on a distance caliper according to claim 1 or 2, characterized in that The back of the distance caliper (30) is provided with a suction cup (32) capable of being adsorbed on concrete.

4. According to claim 3, a non-destructive testing system for structural concrete strength based on a distance caliper is characterized in that ; The distance caliper (30) has a scale.

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