Strength springback detection device for water conservancy dam

Abstract

The utility model discloses a water conservancy dam strength springback detection device, and aims to improve the detection data accuracy and the detection efficiency. The device comprises a triangular base, a display board, a cross-shaped sliding table, a guide rod assembly, a rebound apparatus fixing plate and a rebound apparatus, the triangular base is composed of a bottom plate and a vertical plate, the display board is arranged in the opposite direction of the bottom plate and is perpendicular to the vertical plate, and multiple rows and multiple columns of grid holes are formed in the display board; the guide rod assembly is installed on one side of the vertical plate through the cross-shaped sliding table and located above the display plate in a cantilever state, the rebound apparatus fixing plate is installed on the guide rod assembly in a sliding fit mode, and the rebound apparatus is fixed to the rebound apparatus fixing plate and is in a vertical state. According to the device, through constraint of the cross-shaped sliding table, the instrument axis of the rebound instrument is always perpendicular to the surface of concrete, and the measurement accuracy is improved. Meanwhile, by using the device, the steps of scribing and drawing checks on the surface of the concrete are omitted, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete strength testing equipment for gravity concrete embankments. Background Technology

[0002] In the construction and maintenance of gravity concrete dams, it is necessary to effectively test the compressive strength of concrete. Among them, rebound testing is a commonly used non-destructive testing method that is widely used in assessing the compressive strength of concrete.

[0003] The method for testing concrete with a rebound hammer is as follows: First, draw multiple rows and columns of squares on the surface of the concrete dam to be tested, for example, 5*5 squares. Then, turn on the rebound hammer, use the impact rod to press against the concrete surface, and ensure that the instrument axis of the rebound hammer is always perpendicular to the concrete surface within one square, as centered as possible. Then, slowly and evenly apply pressure. After the impact hammer releases its hook and impacts the impact rod, the impact hammer rebounds, causing the pointer to move backward to a certain position. When the indication line on the pointer block shows a certain value on the scale, this is the rebound value, and it is recorded. Then, the rebound test is performed on the next square, and the data is recorded, until 25 squares have been tested. Finally, the three largest and three smallest values ​​are removed, and the average of the remaining values ​​is taken. Combined with the carbonation depth data, the corresponding concrete strength value is found in the concrete rebound hammer strength conversion table, which is the concrete strength at that point. This is used to determine whether the concrete strength of the dam meets the design strength. As can be seen, the steps are relatively cumbersome, and the instrument axis of the rebound hammer may sometimes be tilted, affecting the accuracy of the measurement. To address this issue, some organizations have developed a multi-point concrete strength testing device.

[0004] For example, Chinese patent document CN119688511A discloses a concrete strength testing device. This device inserts the top end face of a rebound hammer into a mounting frame, and then a buffer spring resets the top block, causing it to move upwards. The rebound hammer is fixed in the mounting frame via the end face of the top block, allowing four rebound hammers to simultaneously test the concrete strength of highway bridges, assisting workers in testing the concrete strength of highway bridges and improving the efficiency of highway bridge testing. However, because the four rebound hammers are fired simultaneously, interference exists between them, affecting the accuracy of the data. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic dam strength rebound testing device, which solves the problem of concrete strength testing for hydraulic dams, especially those on sloping surfaces, aiming to improve the accuracy of test data and increase testing efficiency.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] A rebound testing device for the strength of hydraulic dams includes a triangular base, a display board, a cross slide, a guide rod assembly, a rebound hammer fixing plate, and a rebound hammer. The triangular base consists of a base plate and a vertical plate arranged perpendicularly to each other. The display board is positioned opposite the base plate and perpendicular to the vertical plate, and has multiple rows and columns of square holes. The guide rod assembly is mounted on one side of the vertical plate via the cross slide and is located above the display board in a cantilevered state. The rebound hammer fixing plate is slidably mounted on the guide rod assembly, and the rebound hammer is fixed to the rebound hammer fixing plate in a vertical position.

[0008] Furthermore, the cross slide table includes a horizontal slide rail assembly, a horizontal slide plate, a vertical slide rail assembly, and a vertical slide plate, wherein the horizontal slide plate is movably mounted on the vertical plate via the horizontal slide rail assembly, and the vertical slide plate is mounted on the horizontal slide plate via the vertical slide rail assembly.

[0009] Furthermore, the guide rod assemblies are in pairs and arranged parallel to each other.

[0010] Furthermore, the guide rod assembly includes a guide rod and a connecting rod, wherein the connecting rod is disposed on the outside of the guide rod and locked with a locking nut, and the inner end of the guide rod is fixed to the vertical slide plate by a circular flange and fastening screws, and the fixed guide rod is perpendicular to the vertical slide plate.

[0011] Furthermore, a sliding sleeve that slides in cooperation with the guide rod is fixedly installed in the rebound spring fixing plate.

[0012] Furthermore, a magnet is provided at the contact surface between the rebound spring fixing plate and the vertical sliding plate.

[0013] Furthermore, the rebound spring is fixed to the rebound spring fixing plate by steel hoops.

[0014] Furthermore, an elongated hole is provided at the base plate.

[0015] Furthermore, the display panel is a perforated metal plate or a polymer plastic plate.

[0016] Furthermore, the square holes are numbered.

[0017] The beneficial effects of this utility model are:

[0018] During operation, the cross slide of this device ensures that the rebound hammer's instrument axis remains perpendicular to the concrete surface, improving measurement accuracy. Furthermore, this device eliminates the need for marking lines and drawing grids on the concrete surface, thus increasing testing efficiency. Attached Figure Description

[0019] Figure 1This is a perspective view of the device, showing the front axle side view.

[0020] Figure 2 This is a perspective view of the device, showing the rear axle side view.

[0021] Figure 3 This diagram illustrates the usage of this device on the dam slope.

[0022] In the picture:

[0023] 100mm triangular base, 110mm base plate, 120mm vertical plate, 130mm triangular rib plate, 140mm elongated hole.

[0024] 200 display board, 210 square holes,

[0025] 300 cross slide, 310 horizontal slide rail assembly, 320 horizontal slide plate, 330 vertical slide rail assembly, 340 vertical slide plate.

[0026] 400 guide rod assembly, 410 guide rod, 420 connecting rod, 430 lock nut, 440 round flange.

[0027] 500 rebound spring holder mounting plate, 510 sliding sleeve, 520 small magnet.

[0028] 600 rebound hammer, 610 steel hoop,

[0029] 00 Concrete dam body. Detailed Implementation

[0030] This embodiment will be described in conjunction with the appendix to the instruction manual. Figure 1 To be continued Figure 3 This paper provides a detailed explanation of the structure, principle, and usage of the strength rebound testing device for water conservancy dams.

[0031] This device includes a triangular base 100, a display board 200, a cross slide 300, a guide rod assembly 400, a rebound hammer fixing plate 500, and a rebound hammer 600. The triangular base 100 is made of aluminum alloy profile and has a 90-degree angle. One base plate 110 of the triangular base is attached to the concrete surface, while the other vertical plate 120 is set perpendicular to the concrete surface.

[0032] Furthermore, a triangular rib plate 130 is welded and installed within the 90-degree angle to form a stable triangular structure. This triangular rib plate is used to improve the overall rigidity of the triangular base.

[0033] Furthermore, an elongated hole 140 is provided on the base plate of the triangular base, which is used to fix the device to the concrete dam body 00 to be tested by means of steel nails.

[0034] The display panel 200 is a thin metal sheet or a thin polymer plastic sheet. It is positioned opposite the base plate and perpendicular to the vertical panel, forming a T-shaped structure. (See reference.) Figure 1 and Figure 2 The display panel is a thin sheet with square holes 210 arranged in rows and columns, for example, 5*5 square holes, which are perforated. In the testing state, the display panel is attached to the surface of the concrete embankment to be tested.

[0035] Furthermore, the 25 square holes in the display board are numbered to facilitate the recording of test data. During testing, the test is carried out in order of number to prevent missed tests.

[0036] A cross slide 300 is composed of a pair of vertically arranged linear slide rail assemblies and a pair of vertically arranged linear slide rail assemblies. The cross slide is mounted on the vertical plate of a triangular base and faces one side of the display panel. Specifically, the cross slide 300 includes a horizontal slide rail assembly 310, a horizontal slide plate 320, a vertical slide rail assembly 330, and a vertical slide plate 340. The horizontal slide plate 320 is movably mounted on the vertical plate via a pair of horizontal slide rail assemblies, giving it a horizontal sliding tendency relative to the triangular base. The vertical slide plate 340 is mounted on the horizontal slide plate via vertical slide rail assemblies, giving it a vertical sliding tendency relative to the triangular base.

[0037] The guide rod assemblies 400 consist of two pairs arranged parallel to each other. Each assembly comprises two circular guide rods 410 (upper and lower) and a connecting rod 420 connecting the two guide rods. The connecting rod 420 is located on the outer side of the guide rods and is locked in place using a locking nut 430. The inner ends of the two guide rods 410 are fixed to the vertical slide plate via circular flanges 440 and fastening screws, ensuring the fixed guide rods are perpendicular to the vertical slide plate. The guide rod assemblies 400 are used for mounting the rebound hammer fixing plate.

[0038] The rebound hammer fixing plate 500 is a vertical plate. Four sliding sleeves 510 are fixedly installed in the rebound hammer fixing plate 500. The sliding sleeves are in sliding engagement with the guide rods in the guide rod assembly. Under the action of pushing force, the rebound hammer fixing plate 500 can slide along the length of the guide rod. The rebound hammer 600 is fixed to the rebound hammer fixing plate by steel hoops. The arc part of the steel hoop 610 hugs the body of the rebound hammer and is fixed with fastening screws. After fixing, the rebound hammer is set vertically and forms a 90-degree angle with the display plate.

[0039] Furthermore, a small magnet 520 is provided at the contact surface between the rebound spring fixing plate and the vertical slide plate. That is, a small magnet is provided on the contact surface of the rebound spring fixing plate and the vertical slide plate respectively. When the gap between the rebound spring fixing plate and the vertical slide plate is less than 2 cm, the rebound spring fixing plate and the vertical slide plate can be automatically attached. This is of positive significance for storage in non-use state.

[0040] The method of using this device is as follows:

[0041] First, place the device on the surface of the concrete dam to be tested. For dams with an angle less than 45°, fix it by pressing down on the triangular base with one foot. Arrange the display board so that it is flat and forms multiple rows and columns of squares on the concrete surface. Then, turn on the rebound hammer and push the rebound hammer and fixing plate outward. Due to the flexibility of the cross slide, move the rebound hammer to the first square. Then, use the impact rod to press against the concrete surface in the first square and slowly and evenly apply pressure. After the impact hammer disengages and impacts the impact rod, the impact hammer rebounds and moves the pointer backward to a certain position. When the indication line on the pointer block shows a certain value on the scale, this is the rebound value. Record this data. Then, adjust the position of the rebound hammer to perform rebound testing on the next square and record the data until 25 squares have been tested. Finally, remove the three largest and three smallest values, take the average of the remaining values, and find the corresponding concrete strength value in the concrete rebound hammer strength conversion table in combination with the carbonation depth data. This is the concrete strength at that location.

[0042] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A rebound testing device for the strength of hydraulic dams, comprising a triangular base, a display board, a cross slide, a guide rod assembly, a rebound hammer fixing plate, and a rebound hammer, characterized in that: The triangular base consists of a base plate and a vertical plate arranged perpendicularly to each other. The display plate is located in the opposite direction of the base plate and perpendicular to the vertical plate. The display plate has multiple rows and columns of square holes. The guide rod assembly is installed on one side of the vertical plate via a cross slide and is located above the display plate in a cantilevered state. The rebound spring fixing plate is installed on the guide rod assembly through a sliding fit. The rebound spring is fixed on the rebound spring fixing plate and is in a vertical state.

2. The hydraulic dam strength rebound testing device according to claim 1, characterized in that, The cross slide includes a horizontal slide rail assembly, a horizontal slide plate, a vertical slide rail assembly, and a vertical slide plate. The horizontal slide plate is movably mounted on the vertical plate via the horizontal slide rail assembly, and the vertical slide plate is mounted on the horizontal slide plate via the vertical slide rail assembly.

3. The hydraulic dam strength rebound testing device according to claim 2, characterized in that, The guide rod assemblies are in pairs and arranged in parallel to each other.

4. The hydraulic dam strength rebound testing device according to claim 3, characterized in that, The guide rod assembly includes a guide rod and a connecting rod. The connecting rod is located on the outside of the guide rod and is locked with a locking nut. The inner end of the guide rod is fixed to the vertical slide plate by a circular flange and fastening screws, and the fixed guide rod is perpendicular to the vertical slide plate.

5. The hydraulic dam strength rebound testing device according to claim 4, characterized in that, A sliding sleeve that slides in conjunction with the guide rod is fixedly installed in the rebound hammer fixing plate.

6. The hydraulic dam strength rebound testing device according to claim 2, characterized in that, Magnets are installed at the contact surfaces between the rebound spring fixing plate and the vertical sliding plate.

7. The hydraulic dam strength rebound testing device according to claim 1, characterized in that, The rebound hammer is fixed to the rebound hammer mounting plate by steel hoops.

8. The hydraulic dam strength rebound testing device according to claim 1, characterized in that, The base plate is provided with elongated holes.

9. The hydraulic dam strength rebound testing device according to claim 1, characterized in that, The display panel is a perforated metal plate or a polymer plastic plate.

10. The hydraulic dam strength rebound testing device according to claim 1, characterized in that, The square holes are numbered.

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