Nondestructive testing device for detecting internal temperature and strain of concrete

Abstract

The utility model provides a nondestructive testing device for detecting the internal temperature and strain of concrete, the nondestructive testing device comprises a protective cylinder, a strain gauge and a movable support, the side wall and a bottom plate of the protective cylinder are both provided with hollow parts, the hollow parts are provided with protective films, the strain gauge is detachably installed in the protective cylinder, and the strain gauge is attached to the protective films. And the movable bracket is detachably connected with the outer wall of the protective cylinder and is used for suspending the protective cylinder in the test container. The protective cylinder can protect the strainmeter from being impacted by concrete, prevent the strainmeter from being moved or damaged, improve the accuracy of data monitoring, and meanwhile, the strainmeter can be recycled after a test is completed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete detection, and particularly relates to a nondestructive testing device for detecting internal temperature and strain of concrete. BACKGROUND

[0002] In the process of concrete experiment, the strain deformation inside the concrete member needs to be measured, and the concrete strain gauge needs to be embedded in the interior in advance before the concrete is poured. During the process of pouring the concrete, the embedded concrete strain gauge is easily impacted by the concrete or deviated or even damaged due to the action of vibration, so that the strain gauge loses the detection effect or causes the measurement data error. Meanwhile, the strain gauge cannot be recycled after the experiment. CONTENT OF THE UTILITY MODEL

[0003] The application solves the technical problem of how to provide a nondestructive testing device for detecting internal temperature and strain of concrete, so as to reduce the interference or damage of the strain gauge in the experiment process and realize the recycling of the strain gauge.

[0004] The application provides a nondestructive testing device for detecting internal temperature and strain of concrete, which comprises:

[0005] A protection cylinder, the side wall and the bottom plate of the protection cylinder are provided with hollow parts, and the hollow parts are provided with a protection film;

[0006] A strain gauge, which is detachably installed in the protection cylinder and is attached to the protection film;

[0007] A moving support, which is detachably connected to the outer wall of the protection cylinder and is used for suspending the protection cylinder in a test container.

[0008] Optionally, the hollow part of the side wall comprises a plurality of annular grooves, and the annular grooves surround the side wall of the protection cylinder; and the hollow part of the bottom plate comprises a plurality of round holes.

[0009] Optionally, the top plate of the protection cylinder is detachably installed at the top end of the protection cylinder, and the top plate is provided with a wiring hole.

[0010] Optionally, the moving support comprises:

[0011] A support, which is horizontally arranged and has two ends for being installed in a test container;

[0012] A plurality of clamping assemblies, which are installed on the support and are used for jointly clamping the outer wall of the protection cylinder.

[0013] Optionally, the clamping assembly comprises a nut, a fixing bolt and a non-slip pad, the nut is mounted on the support, the fixing bolt is threadedly connected with the nut, and the non-slip pad is mounted on the fixing bolt and abuts against the outer wall of the protective cylinder when the fixing bolt is in a tightened state.

[0014] Optionally, the support is a telescopic support.

[0015] Optionally, the number of the supports is two, and the two supports are arranged vertically, and each of the supports is provided with two clamping assemblies.

[0016] Optionally, the non-destructive testing device further comprises:

[0017] A buffer is arranged between the strain gauge and the inner wall of the protective cylinder.

[0018] Optionally, the protective cylinder is a cylinder made of brass.

[0019] Optionally, the non-destructive testing device further comprises a concrete temperature detector, and the concrete temperature detector is mounted on the inner wall of the protective cylinder.

[0020] The non-destructive testing device for detecting the temperature and strain inside the concrete provided in the application has the following technical effects:

[0021] The strain gauge will not be interfered by friction and will not be deviated from the original measuring point position due to a large concentrated force, thereby solving the problems of instability, large interference and large space occupation of the traditional device, and the device is integrally formed, thereby greatly reducing the installation workload and effectively reducing the time cost. After the experiment is completed, the strain gauge is not discarded together with the test piece, but is recovered and collected by removing the protective device and taking out the strain gauge, thereby reducing the experimental cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a use schematic view of a non-destructive testing device for detecting the temperature and strain inside concrete according to one or more embodiments;

[0023] Figure 2 FIG. 2 is a structure exploded schematic view of a non-destructive testing device for detecting the temperature and strain inside concrete according to one or more embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0025] Before various embodiments of the present application are described in detail, the technical concept of the present application is first described simply: at present, in the process of detecting the strain of concrete, the strain gauge is easily impacted by the concrete, resulting in inaccurate measurement data and the inability to recycle the strain gauge. Therefore, the nondestructive testing device for detecting the internal temperature and strain of concrete provided by the present application installs the strain gauge in the interior of the protective cylinder, opens a hollow part in the protective cylinder and sets a protective film, so that the strain gauge can detect the strain of the concrete through the hollow part, and the protective cylinder can be suspended in the test container through the moving support. The protective cylinder can protect the strain gauge from being impacted by the concrete, prevent the strain gauge from being moved or damaged, and also recycle the strain gauge after the test is completed. The specific principle of the nondestructive testing device for detecting the internal temperature and strain of concrete of the present application will be described below in combination with more embodiments.

[0026] Specifically, as shown in Figure 1 and Figure 2 the nondestructive testing device for detecting the internal temperature and strain of concrete of the present embodiment comprises a protective cylinder 10, a strain gauge 20 and a moving support 30. The side wall and the bottom plate of the protective cylinder 10 are provided with a hollow part, the hollow part is provided with a protective film 11, the strain gauge 20 is detachably installed in the interior of the protective cylinder 10, and the strain gauge 20 is attached to the protective film 11, and the moving support 30 is detachably connected to the outer wall of the protective cylinder 10, and the moving support 30 is used to suspend the protective cylinder 10 in the test container. Among them, the shape and size of the protective cylinder 10 match the shape and size of the strain gauge 20.

[0027] In one or more embodiments, the hollow part of the side wall comprises a plurality of annular grooves 12, the annular grooves 12 surround the side wall of the protective cylinder 10, and the hollow part of the bottom plate comprises a plurality of round holes 13. When the protective cylinder 10 is placed in the concrete, the strain of the concrete is transmitted to the strain gauge 20 through the protective film 11 to realize strain measurement, while preventing the strain gauge 20 from being impacted by the concrete. Exemplarily, the number of round holes 13 is 5, the number of annular grooves 12 is three circles, and the protective film 11 adopts a polyethylene film.

[0028] Further, the top plate 14 of the protective cylinder 10 is detachably installed at the top end of the protective cylinder 10, and the top plate 14 is provided with a wire hole 15. When installing, open the top plate 14, install the strain gauge 20 in the protective cylinder 10, pass the connecting wire of the strain gauge 20 through the wire hole 15, and finally cover the top plate 14.

[0029] In one or more embodiments, the moving support 30 comprises a support 31 and a plurality of clamping assemblies 32, the support 31 is horizontally arranged, and both ends of the support 31 are used to be installed in the test container 100, the clamping assemblies 32 are installed on the support 31, and the plurality of clamping assemblies 32 are used to jointly clamp the outer wall of the protective cylinder 10 to fix the protective cylinder 10.

[0030] Exemplarily, the clamping assembly 32 comprises a nut 321, a fixing bolt 322 and a non-slip pad 323. The nut 321 is installed on the support 31, the fixing bolt 322 is threadedly connected with the nut 321, and the non-slip pad 323 is installed on the fixing bolt 322 and abuts against the outer wall of the protection cylinder 10 when the fixing bolt 322 is in a tightened state, so as to clamp the protection cylinder. When the fixing bolt 322 is in an untightened state, the non-slip pad 323 is away from the outer wall of the protection cylinder 10.

[0031] In one or more embodiments, the number of the supports 31 is two, and the two supports 31 are arranged vertically, and each of the two supports 31 is installed with two clamping assemblies 32. The four clamping assemblies 32 are distributed at 90° respectively, and can clamp the protection cylinder 10 together.

[0032] In one or more embodiments, the two ends of the support 31 are provided with buckles 31a, which can be clamped on the side wall of the test container 100 to support the support 31 on the test container 100. Exemplarily, the support 31 is a telescopic support, and the position of the protection cylinder 10 can be adjusted by adjusting the telescopic length of the support 31. For example, the support 31 adopts a telescopic rigid rod, which is composed of an internal metal rod and an external sleeve. The rod is made of a metal alloy material and has elasticity and toughness, and the sleeve is used to fix the metal rod and protect the internal structure. In work, the external compression force acts on the metal rod to cause elastic deformation, and the deformation is proportional to the force. The greater the force, the greater the deformation, and the more fixed.

[0033] Further, the nondestructive testing device further comprises a buffer 40 arranged between the strain gauge 20 and the inner wall of the protection cylinder 10. Exemplarily, the buffer 40 adopts a rubber ring, which is sleeved on the outer wall of the strain gauge 20. In this way, the strain gauge 20 can be spaced apart from the protection cylinder 10 by the rubber ring, and the rubber ring can protect the strain gauge 20 when shaking occurs during the installation process or the test process. The position of the rubber ring needs to avoid the annular groove 12. The rubber ring has a certain elasticity, which ensures that the strain gauge 20 has a certain deformation ability when subjected to a large transverse load, thereby protecting the integrity of the strain gauge 20. The outer shape of the rubber ring is matched with the inner shape of the side wall.

[0034] In one or more embodiments, the nondestructive testing device further comprises a concrete temperature detector, which is installed on the inner wall of the protection cylinder.

[0035] In one or more embodiments, the protection cylinder 10 is a cylinder body made of brass. The side wall, bottom plate and top plate of the protection cylinder 10 are all made of brass. The brass container has good heat conductivity and can accurately measure temperature changes.

[0036] The installation process of the nondestructive testing device is as follows: first, the rubber pad is sleeved on the outside of the strain gauge 20 at the fixed position from the sensing end; the outer wall of the protective cylinder 10 is clamped by the clamping assembly 32, the length of the support 31 is changed, the buckle 31a is clamped on the outside of the test container 100, and the strain gauge 20 and the protective cylinder 10 are vertically fixed in the center of the test container 100.

[0037] The test process is as follows:

[0038] (1) Check the strain gauge 20.

[0039] (2) The test container 100 barrel should not be water permeable and air permeable, and the inner wall of the test container 100 is coated with a layer of 0.3mm-0.5mm thick asphalt isolation layer.

[0040] (3) Install the nondestructive testing device for internal temperature and strain of concrete, fix the strain gauge 20 in the protective cylinder 10, open the support 31, and vertically fix the strain gauge 20 in the center of the test container 100. Before and after the test piece is formed, the resistance and resistance ratio of the strain gauge should be measured and recorded.

[0041] (4) Put the concrete mixture into the test container 100.

[0042] (5) Put the test piece after curing for 7 days into the constant temperature water tank, the water surface in the tank should be above the top surface of the test piece by more than 50mm, and the initial temperature of the water can be 10℃-20℃.

[0043] (6) Adjust the temperature controller of the constant temperature tank, so that the water temperature rises to about 60℃, and after constant temperature, record the resistance, resistance ratio and water temperature when the center temperature of the test piece is consistent with the water temperature, which is the measured value at the end of the test.

[0044] (7) Open the top plate at the upper part of the protective cylinder 10, remove the movable support 30, and recover the strain gauge 20.

[0045] The specific embodiments of the present application are described in detail above, although some embodiments have been shown and described, those skilled in the art should understand that the embodiments can be modified and improved without departing from the principles and spirits of the present application, which are defined by the claims and their equivalents, and these modifications and improvements should also be within the protection scope of the present application.

Claims

1. A non-destructive testing device for detecting temperature and strain within concrete, characterized by, The nondestructive testing device comprises: A protective cylinder, the side wall and the bottom plate of which are provided with hollow parts, and the hollow parts are provided with protective films; A strain gauge, which is detachably installed inside the protective cylinder and is attached to the protective films; A moving support, which is detachably connected to the outer wall of the protective cylinder and is used for suspending the protective cylinder in a test container.

2. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 1, wherein The hollow part of the side wall comprises a plurality of annular grooves, which surround the side wall of the protective cylinder; and the hollow part of the bottom plate comprises a plurality of circular holes.

3. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 2, wherein The top plate of the protective cylinder is detachably installed at the top end of the protective cylinder, and the top plate is provided with a wiring hole.

4. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 1, wherein The moving support comprises: A support, which is horizontally arranged and has two ends for installation in a test container; A plurality of clamping assemblies, which are installed on the support and are used for jointly clamping the outer wall of the protective cylinder.

5. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 4, wherein The clamping assembly comprises a nut, a fixing bolt and an anti-skid pad, the nut is installed on the support, the fixing bolt is threadedly connected with the nut, and the anti-skid pad is installed on the fixing bolt and abuts against the outer wall of the protective cylinder when the fixing bolt is in a tightened state.

6. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 4, wherein The support is a telescopic support.

7. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 4, wherein The number of the supports is two, and the two supports are arranged vertically, and each of the supports is provided with two clamping assemblies.

8. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 1, wherein The nondestructive testing device further comprises: A buffer, which is arranged between the strain gauge and the inner wall of the protective cylinder.

9. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 1, wherein The protective cylinder is a cylinder body made of brass.

10. The non-destructive testing device for detecting temperature and strain inside concrete according to claim 1, wherein The nondestructive testing device further comprises a concrete temperature detector, which is installed on the inner wall of the protective cylinder.

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