CN210533306U

CN210533306U - Distance measuring device for concrete crack depth detection

Info

Publication number: CN210533306U
Application number: CN201921296975.8U
Authority: CN
Inventors: 杜艳兵; 张超兵; 郝利斌; 杨培勇; 马占洲; 赵文敏; 辛俊红; 白芸; 黄志杰; 张龙龙; 王洪涛; 张晶晶; 刘铭; 李琪; 王璐光; 薛罡; 李宇; 郝一凡; 赵宇; 乔栋
Original assignee: Shanxi Huacheng Engineering Testing Co ltd; China Railway Sixth Group Co Ltd; Taiyuan Railway Construction Co Ltd of China Railway Sixth Group Co Ltd
Current assignee: Huaguan Tiancheng Testing Certification Co ltd; China Railway Sixth Group Co Ltd; Taiyuan Railway Construction Co Ltd of China Railway Sixth Group Co Ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-05-15
Anticipated expiration: 2029-08-12

Abstract

The utility model relates to an auxiliary device when concrete crack depth detects specifically is a range unit when concrete crack depth detects. The utility model provides a range unit when concrete crack depth detects, includes the range finding board, and the middle part of range finding board is rectangular form cavity region, and this cavity region is as the measuring area of range finding board, sets up 0 scale on the range finding board at cavity region intermediate position as the benchmark, and the equidistant position in 0 scale left and right sides sets up the same scale interval respectively on the range finding board, and the scale interval constitutes the reading district, and the four corners position department of range finding board sets up the fixed point that sets up to the range finding board. During sound time measurement, the T transducer and the R transducer are placed on a ranging board, and the distance between the inner edges of the two transducers is controlled through scale values on the ranging board. Adopt the utility model provides a range unit controls transducer inward flange distance, has reduced human error's influence, has guaranteed the accuracy of range finding.

Description

Distance measuring device for concrete crack depth detection

Technical Field

The utility model relates to an auxiliary device when concrete crack depth detects specifically is a range unit when concrete crack depth detects.

Background

After a hundred years of development, concrete materials have become the most widely used and most used building materials in construction projects such as cities, towns, highways, bridges, ports, wharfs and the like. With the widespread use of concrete structures, the problem of cracking has become an important factor affecting the durability of modern concrete. In particular, cracks in reinforced concrete members have become a common phenomenon in the fields of building construction, bridges, and the like. The causes of concrete cracks involve complex factors such as design, construction process, raw materials and mixture ratio of concrete, climate environment and the like. Solving the problem of cracking is a huge and systematic project. In summary, the internal stress generated by various factors in the concrete and the tensile capacity thereof are spears, and when the internal stress is greater than the tensile capacity thereof, cracks are inevitably generated; in contrast, when its tensile capacity is greater than its internal stress, no cracks are generated. After the concrete results have cracks, firstly crack detection is carried out, the detection contents comprise crack width detection and crack depth detection, and the crack detection results provide basis for later-stage concrete reinforcement, repair and the like, so that the accuracy of the concrete crack detection results is of great importance.

The concrete crack detection method includes crack width detection and crack depth detection, wherein a reading microscope is generally adopted for crack width detection, the reading microscope is a composite instrument composed of an optical lens, vernier scales and the like and is used for detecting the crack width of concrete and other materials, a cold light source is arranged, clear crack width can be seen under the condition of no light line, the crack depth is detected by an ultrasonic method, the detection steps are that ① detection parts are selected, ② is used for polishing and cleaning the surface of the concrete, ③ is used for arranging ultrasonic measuring points, ④ is used for carrying out ultrasonic testing across seams and ultrasonic testing without across seams respectively, ⑤ records the testing distance when a first wave is in a phase reversal state, ⑥ is used for solving the actual propagation distance of sound waves of the measuring points without across seams and the sound velocity of the concrete, ⑦ is calculated according to a crack depth formula, when sound time is measured, the distance between the inner edges of T and R transducers is equal to 100mm, 150mm, 200mm and 250mm, sound time is read respectively, in the actual detection process, the marking distance is generally carried out by a marking method, but a plurality of energy conversion tools, and a pencil is used for marking the defect that the inner edge distance is needed, only a pencil is needed to be marked when a large pencil, and the detection instrument is needed, and the detection is used for detecting crack detection, and the detection is carried out a detection, a detection method, and the detection condition that the detection is that the crack detection is a high-point detection is needed, the detection is that the detection efficiency is high-detection efficiency is needed.

Disclosure of Invention

In order to solve the problem, the utility model provides a range unit when concrete crack depth detects. When the concrete crack depth is detected, the propagation distance of ultrasonic waves is accurately marked, then the sound time values corresponding to different distances are respectively read, and finally the crack depth is accurately measured.

The utility model discloses an adopt following technical scheme to realize: the utility model provides a range unit when concrete crack depth detects, includes the range finding board, and the middle part of range finding board is rectangular form cavity region, and this cavity region is as the measuring area of range finding board, sets up 0 scale on the range finding board at cavity region intermediate position as the benchmark, and the equidistant position in 0 scale left and right sides sets up the same scale interval respectively on the range finding board, and the scale interval constitutes the reading district, and the four corners position department of range finding board sets up the fixed point that sets up to the range finding board. During sound time measurement, the T transducer and the R transducer are placed on a ranging board, and the distance between the inner edges of the two transducers is controlled through scale values on the ranging board.

According to the distance measuring device for detecting the depth of the concrete crack, the width of the hollow area is larger than that of the transducer, and the transducer can move freely in the hollow area.

According to the distance measuring device for detecting the depth of the concrete crack, the scale values which are respectively arranged at the equal distance positions of the left side and the right side of the scale 0 on the distance measuring plate are 50mm, 75mm, 100mm, 125mm, 150mm, 175mm and 200 mm. The distance between the inner edges of the two transducers in the specification is preferably 100mm, 150mm, 200mm, 250mm, 300mm, 350mm and 400mm, and the scale values are set to meet the requirement of the distance between the inner edges of the two transducers in the specification.

Foretell range unit when concrete crack depth detects, range finding board adopt the organic glass material, when guaranteeing to detect crack depth range finding, overall stability is better, and is inseparable with the concrete surface laminating, and the installation is firm, has guaranteed measuring distance's accuracy.

Adopt the utility model provides a range unit controls transducer inward flange distance, has reduced human error's influence, has guaranteed the accuracy of range finding.

Drawings

Fig. 1 is a general diagram of a distance measuring device for detecting the depth of a concrete crack.

Fig. 2 is a measurement layout.

Fig. 3 is a front view of the ranging apparatus.

Fig. 4 is a side view of the ranging device.

In the figure: 1-ranging board, 2-fixed point, 3-reading area, 4-crack and 5-measuring point.

Detailed Description

The distance measuring device main body distance measuring plate during concrete crack depth detection is made of organic glass, and a measuring area, a reading area, a fixing point and the like are arranged on the distance measuring plate.

1. Distance measuring board

The range finding board 1 adopts the organic glass material, when guaranteeing to detect crack depth range finding, overall stability is better, and is inseparable with the concrete surface laminating, and the installation is firm, has guaranteed measuring distance's accuracy. And reading sound time values t1, t2, t3 and t4. according to different ranging, drawing a sound time value-ranging coordinate graph, solving a regression linear equation between the sound time values and the ranging by using a regression analysis method, then calculating the sound velocity value of the concrete, and finally calculating the depth value of the crack.

2. Measurement area

The measuring area in the distance measuring device is a hollow area, the size of the measuring area can ensure that the transducer can move freely, and when the crack depth is detected, the transducer moves in the measuring area according to different distance measurement values to measure different sound time values respectively.

3. Reading area

The specification requires that the distances between the inner edges of the two transducers are preferably 100mm, 150mm, 200mm, 250mm, 300mm, 350mm and 400mm, so that the scales for setting the reading zones are 0, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm and 200 mm. During detection, the two transducers are symmetrically placed by taking the 0 scale as a reference, and if the two transducers are respectively placed at the 50mm scale, the distance is 100 mm. The scale is adopted for control, so that the influence of human errors is reduced, and the accuracy of distance measurement is ensured.

4. Fixing point

The 2 marks of fixed point are in four angular positions of range unit, and during the use, paint the adhesive at the fixed point, then wholly paste range unit at concrete detection position, guarantee to fix firmly.

Specific detection method

The concrete implementation method of the distance measuring device during concrete crack depth detection is explained in the application with reference to the standard 'technical specification for detecting concrete structure entity in water transportation engineering' JTS 239-2015.

1. Before detection, engineering data should be investigated, and relevant data such as concrete crack cracking time and cracking process should be collected.

2. The cracks are numbered according to positions, the positions and the trends of the cracks are drawn into a diagram, and the lengths of the cracks are measured by a steel tape.

3. When crack depth detection is carried out, a measuring point in a measuring area should avoid a steel bar, and accumulated water and foreign matters should not exist in a crack.

4. After the measuring points are selected, the adhesive is uniformly coated at the fixed point positions of the distance measuring device, then the distance measuring device is adhered to the surface to be measured of the concrete, and the distance measuring device is fixed. In the process of pasting, the position of the distance measuring device can be adjusted according to the position of the measuring point, and the alignment of the 0 scale of the distance measuring device and the position of the crack measuring point is ensured. Simultaneously, range unit should install firmly, guarantees that the disappearance slides and drops in the testing process, and the influence detects data or causes personnel's injury.

5. And (3) coating a coupling agent on the transducer to ensure that the transducer is in close contact with a measuring point. Then, the transducers are placed in the measuring area for detection, and the distances between the two transducers are 100mm, 150mm, 200mm and 250mm. The distance is controlled by the reading zone, and if the distance is 100mm, the two transducers are respectively arranged at the position of 50mm in the reading zone.

6. And (3) reading the sound time value t1, t2, t3 and t4. according to different distance measurement, drawing a sound time value-distance measurement coordinate graph, solving a regression linear equation between the sound time value and the distance measurement by using a regression analysis method, and then calculating the sound speed value of the concrete.

7. And (2) crack depth detection, namely, respectively placing two receiving and transmitting transducers of the ultrasonic detector at two symmetrical sides of a crack, keeping the relative directions of the two transducers consistent with the condition of not crossing the crack for measurement, respectively reading sound time values t1 ', t 2', t3 'and t 4', and calculating the crack depth according to a formula, wherein the distances between the two transducers are respectively 100mm, 150mm, 200mm and 250mm.

Claims

1. The utility model provides a range unit when concrete crack depth detects, its characterized in that includes range finding board (1), and the middle part of range finding board (1) is rectangular form cavity region, and this cavity region is as the measuring area of range finding board, sets up 0 scale on the range finding board at cavity region intermediate position as the benchmark, and the equidistant position in 0 scale left and right sides sets up the same scale value respectively on the range finding board, and the four corners position department of range finding board sets up to range finding board fixed point (2).

2. A distance-measuring device for detecting concrete crack depth according to claim 1, wherein the width of the hollow area is larger than the width of the transducer.

3. A distance measuring device for detecting the depth of a concrete crack according to claim 1 or 2, wherein the scale values of 50mm, 75mm, 100mm, 125mm, 150mm, 175mm and 200mm are respectively arranged at equal distance positions on the left side and the right side of the scale 0 on the distance measuring plate.

4. The distance measuring device for detecting the depth of the concrete crack according to claim 1 or 2, wherein the distance measuring plate (1) is made of organic glass.