A device and method for measuring the thickness of slurry on the side of concrete

Abstract

The present invention discloses a device for measuring the thickness of the side slurry of concrete, which includes a concrete container, a support beam, a vibrating rod, a plurality of filter meshes, a telescopic support, and a combined transmission. The upper part of the concrete container is open, and both ends of the support beam are horizontally arranged at the upper opening of the concrete container; the head of the vibrating rod is installed on the support beam, and the lower end of the vibrating rod vertically extends into the concrete container; the filter mesh is an arc-shaped mesh adapted to the concrete container, and a plurality of filter meshes are installed at intervals circumferentially in the concrete container; each filter mesh is configured with a telescopic support, the telescopic support is installed on the combined transmission, and the combined transmission is connected to the support beam through a suspension rod. The present invention also provides a method for measuring the thickness of the side slurry of concrete. The beneficial effects of the present invention are as follows: it can effectively detect the thickness of the side slurry of concrete, thereby infer the thickness of the side slurry of hardened concrete, timely adjust the working performance or vibration technology of concrete, reduce the thickness of the side slurry of the concrete structure, thereby reducing quality disputes and ensuring the smooth acceptance of the project.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete preparation, and particularly relates to a device and method for measuring the thickness of the side slurry of concrete. Background Art

[0002] Due to the continuous acceleration of urban development, the concrete structure has become more and more complex and diversified, and the requirements for the working performance of concrete are also getting higher and higher. For example, for pumped concrete, and even for most super high-rise building projects, self-compacting concrete is required. In this type of concrete, the slurry volume is relatively large; during the pouring process of concrete, vibration is often required to help it flow better and increase its compactness. During the vibration process, the consistency of the slurry changes, resulting in the gravel not only sinking but also shifting towards the vibration point. At the same time, since there is enough distance between the vibrating rod and the formwork, the slurry and the gravel move in opposite directions during the vibration process, thus making the slurry near the formwork thicker. In terms of the strength acceptance of the concrete structure, the strength is usually deduced by rebound on the side of the structure. For medium and low strength grades, if the thickness of the side slurry of the concrete is too thick, the rebound strength will be reduced, and there will be a large difference from the strength of the specimens left, which is not conducive to the smooth acceptance of the engineering project.

[0003] In the prior art, there are only devices and methods for detecting the thickness of the floating slurry on the upper surface of concrete, and there is no related technology for detecting the thickness of the side slurry of concrete. Therefore, it is very necessary to design a reasonable method to measure the thickness of the side slurry of concrete in order to adjust the working performance of concrete or the vibration process in a timely manner and ensure the engineering quality and the normal acceptance of the project. Summary of the Invention

[0004] The purpose of the present invention is to provide a simple and reliable device and method for measuring the thickness of the side slurry of concrete in view of the deficiencies of the prior art.

[0005] The technical solution adopted by the present invention is as follows: A device for measuring the thickness of the side slurry of concrete includes a concrete container, a support beam, a vibrating rod, a plurality of filter meshes, a telescopic support and a combined transmission device. The upper part of the concrete container is open. The two ends of the support beam are horizontally arranged at the upper opening of the concrete container. The head of the vibrating rod is installed on the support beam, and the lower end of the vibrating rod vertically extends into the concrete container. The combined transmission device is connected to the support beam through a suspension rod. The filter meshes are arc-shaped meshes adapted to the concrete container, and a plurality of filter meshes are circumferentially and spacedly installed in the concrete container. Each filter mesh is provided with a telescopic support. The telescopic support is installed on the combined transmission device. The combined transmission device provides power for the telescopic support. The telescopic end of the telescopic support is connected to the corresponding filter mesh, driving the filter mesh to move radially, approaching or moving away from the inner wall of the concrete container.

[0006] According to the above solution, the combined transmission includes an annular bracket, a motor, a turbine and a worm. A through hole for the vibrating rod to pass through is provided at the center of the annular bracket. The motor is installed on the annular bracket. The motor is connected to the turbine of the reversing gear. The turbine meshes with the worm. The outer end of the worm is connected to one end of the telescopic bracket. When the motor rotates clockwise or counterclockwise, the worm moves in different directions, and the telescopic bracket expands and contracts back and forth.

[0007] According to the above solution, the measuring device further includes a controller, which is respectively connected to the combined transmission and the vibrating rod, and is used to control the contraction of the telescopic bracket and the operation of the vibrating rod.

[0008] According to the above solution, the concrete container is a cylindrical barrel. Positioning grooves symmetrically arranged in the radial direction are provided at the upper edge of the concrete container. Both ends of the support beam are installed in the positioning grooves.

[0009] According to the above solution, a through hole for the vibrating rod to pass through is provided in the middle of the support beam.

[0010] According to the above solution, the filter screen is an arc-shaped wire mesh adapted to the concrete container. The center of the inner side of the filter screen is connected to the telescopic end of the telescopic bracket.

[0011] According to the above solution, the mesh holes of the filter screen are square, and the side length of the mesh holes is 4.5 mm to 5.0 mm.

[0012] According to the above solution, there are 4 filter screens. Correspondingly, there are 4 telescopic brackets, which are arranged in a cross shape, and the intersections of the telescopic brackets are connected by a combined transmission.

[0013] According to the above solution, the combined transmission is provided with 4 motors that work independently, respectively controlling the expansion and contraction of the four telescopic brackets, and the expansion and contraction speed thereof is not higher than 0.1 mm / s.

[0014] The present invention also provides a method for measuring the thickness of the side slurry of concrete, and the method includes the following steps:

[0015] Step 1: Provide the measuring device as described above and install it;

[0016] Step 2: Pour the uniformly stirred concrete into the concrete container;

[0017] Step 3: The controller starts the vibrating rod to vibrate the concrete and then let it stand still;

[0018] Step 4: The controller respectively controls the telescopic brackets to contract through the combined transmission, drives the filter screen to move radially inward. When the force value of a certain micro-motor changes suddenly, stop the micro-motor until all four micro-motors stop completely;

[0019] Step 5: Respectively measure the radial distances between the inner wall of the concrete container and each filter screen;

[0020] Step 6: Calculate the thickness S of the slurry on the side of the concrete. The thickness S of the slurry on the side of the concrete is equal to the arithmetic mean of the radial distances between the inner wall of the concrete container and each filter screen.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The detection device and method of the present invention can effectively detect the thickness of the slurry on the side of the concrete, thereby inferring the thickness of the slurry on the side of the hardened concrete, timely adjusting the working performance of the concrete or the vibration process, reducing the thickness of the slurry on the side of the concrete structure, thus reducing quality disputes and ensuring the smooth acceptance of the project.

[0023] (2) The present invention can replace the material of the container to correspond to the material of the formwork in engineering applications, such as plastics, stainless steel, aluminum alloy, etc., which is convenient for simulating and analyzing the adsorption degree of different materials on the concrete slurry, so as to accurately analyze the thickness of the slurry on the side of the concrete structure under this project;

[0024] (3) The present invention can explore the variation law of the thickness of the slurry on the side of the concrete by adjusting the vibration time of the vibrating rod, providing a good reference for the concrete pouring and vibration in the project, thereby avoiding the excessive thickness of the slurry on the side of the structure caused by too long vibration time of the concrete, which affects the rebound strength result.

[0025] (4) The device of the present invention is reasonably designed and the operation method is simple and reliable. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a specific embodiment of the present invention.

[0027] Figure 2 It is a connection schematic diagram of the filter screen, the telescopic bracket, the combined transmission and the support beam in this embodiment.

[0028] Figure 3 It is a schematic structural diagram of the combined transmission in the present invention.

[0029] Figure 4 It is a configuration schematic diagram of the motor, the turbine and the worm in the present invention.

[0030] Reference numerals: 1 - concrete container, 1-1 - positioning groove, 2 - support beam, 3 - telescopic bracket, 4 - combined transmission, 4-1 - motor, 4-2 - turbine, 4-3 - worm, 4-4 - annular bracket, 5 - filter screen, 6 - vibrating rod, 7 - controller, 8 - suspension rod. Detailed Embodiment

[0031] In order to better understand the present invention, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0032] As Figure 1 shown, a measuring device for the thickness of the side slurry of concrete includes a concrete container 1, a support beam 2, a vibrating rod 6, a plurality of filter meshes 5, a telescopic bracket 3 and a combined transmission 4. The upper part of the concrete container 1 is open. The two ends of the support beam 2 are horizontally arranged at the upper opening of the concrete container 1. The head of the vibrating rod 6 is installed on the support beam 2, and the lower end of the vibrating rod 6 vertically extends into the concrete container 1. The filter mesh 5 is an arc-shaped mesh adapted to the concrete container 1, and a plurality of filter meshes 5 are circumferentially and spacedly installed in the concrete container 1. Each filter mesh 5 is provided with a telescopic bracket 3, and the telescopic bracket 3 is installed on the combined transmission 4. As Figure 2 shown, the combined transmission 4 provides power for the telescopic bracket 3. The telescopic end of the telescopic bracket 3 is connected to the corresponding filter mesh 5, driving the filter mesh 5 to move radially, approaching or moving away from the inner wall of the concrete container 1. The filter meshes 5 do not interfere with each other during the movement.

[0033] Preferably, as Figure 3 and Figure 4 shown, the combined transmission 4 includes an annular bracket 4-4, a motor 4-1, a turbine 4-2 and a worm 4-3. A through hole for the vibrating rod 6 to pass through is provided at the center of the annular bracket 4-4. The motor 4-1 is installed on the annular bracket 4-4. The motor 4-1 is connected to the turbine 4-2, and the turbine 4-2 meshes with the worm 4-3. The outer end of the worm 4-3 is connected to one end of the telescopic bracket 3. When the motor 4-1 rotates clockwise or counterclockwise, the worm 4-3 can move in different directions, and the telescopic bracket 3 can be telescoped back and forth, and its telescopic speed is not higher than 0.1 mm / s.

[0034] Preferably, the combined transmission 4 is connected to the support beam 2 through a suspension rod 8. In this embodiment, two suspension rods 8 are provided. The lower ends of the suspension rods 8 are connected to the annular bracket 4-4, and the upper ends of the suspension rods 8 are connected to the support beam 2.

[0035] Preferably, the measuring device further includes a controller 7. The controller 7 is respectively connected to the combined transmission 4 and the vibrating rod 6 (the connecting wires are not shown), and is used to control the contraction of the telescopic bracket 3 and the operation of the vibrating rod 6. Specifically, the controller 7 is connected to the motor 4-1 of the combined transmission 4.

[0036] Preferably, the concrete container 1 is a cylindrical barrel. A positioning groove 1-1 symmetrically arranged along the radial direction is provided at the upper edge of the concrete container 1. The two ends of the support beam 2 are installed in the positioning groove 1-1. A through hole for the vibrating rod 6 to pass through is provided in the middle of the support beam 2.

[0037] Preferably, the filter screen 5 is an arc-shaped wire mesh adapted to the concrete container 1, and the center of the inner side of the filter screen 5 is connected to the telescopic end of the telescopic bracket 3; the mesh holes of the arc-shaped wire mesh are square, and the side length of the mesh holes is 4.5 mm to 5.0 mm, effectively separating the slurry from the gravel.

[0038] In this embodiment, the distance between the lower end of the filter screen 5 and the inner bottom surface of the concrete container 1 does not exceed 4.5 mm; there are 4 filter screens 5, correspondingly, there are 4 telescopic brackets 3, arranged in a cross shape; the combined transmission 4 is a ring structure, and the vibrating rod 6 passes through the combined transmission 4; four motors 4-1 are correspondingly arranged on the combined transmission 4, the four motors 4-1 are arranged opposite to each other in pairs, and are adapted to the position of the telescopic bracket 3; the motor 4-1 is a micro motor; the relevant structures and parameter designs of the turbine 4-2 and the worm 4-3 all meet their functional requirements.

[0039] A method for measuring the thickness of the side slurry of concrete, the method comprising the following steps:

[0040] Step 1: Provide the measuring device as described above and install it.

[0041] The specific installation method is: clean the inside of the concrete container 1, moisten it and keep it free of obvious water, connect the filter screen 5 to the telescopic bracket 3, install it on the combined transmission 4, and put it into the concrete container 1; place the support beam 2 above the concrete container 1 and connect it to the combined transmission 4; insert the vibrating rod 6 along the central circular hole of the support beam 2 and pass through the annular combined transmission 4.

[0042] Step 2: After the concrete is stirred evenly, pour it into the concrete container 1 at one time through another container, and the upper surface of the concrete is slightly lower than the upper port of the concrete container 1;

[0043] Step 3: The controller 7 starts the vibrating rod 6 to vibrate the concrete, and then let it stand still.

[0044] In the present invention, the vibrating time of the concrete is 10 to 20 s, and the standing time is 1 min.

[0045] Step 4: The controller 7 controls the telescopic brackets 3 to contract respectively through the combined transmission 4, driving the filter screen 5 to move radially inwards. When the torque force value of a certain motor 4-1 changes suddenly (when the torsional force value of the motor 4-1 exceeds 1.5 times the initial force value, it can be considered a sudden change), then stop the motor 4-1 until all four motors 4-1 stop completely.

[0046] Step 5: Measure the radial distances between the inner wall of the concrete container 1 and each filter screen 5 respectively.

[0047] In the present invention, the radial distances between the inner wall of the concrete container 1 and each filter screen 5 are S1, S2, S3, and S4 respectively, and the results are accurate to 0.1 mm.

[0048] Step Six: Calculate the thickness S of the slurry on the side of the concrete. The thickness S of the slurry on the side of the concrete is equal to the arithmetic mean of the radial distances between the inner wall of the concrete container 1 and each filter screen 5.

[0049] In the present invention, S is equal to the arithmetic mean of S1, S2, S3, and S4.

[0050] Examples 1 to 4

[0051] In Examples 1 to 4, the above method was used to measure the thickness of the slurry on the side of the C30 concrete specimens (the C30 concrete specimens correspond to the example numbers). Except for the following settings being different: the vibration time of the concrete specimens in Examples 1, 2, and 3 was 15 s, and the vibration time of the concrete specimens in Example 4 was 10 s, as shown in Table 1. The thickness of the slurry on the side of the concrete measured in each example is shown in Table 1.

[0052] For the concretes in Examples 1 to 4, cube specimens with dimensions of 50 cm × 50 cm × 50 cm were formed, and their vibration times corresponded to the examples. Then, mechanical specimens of the concrete were formed. After curing for 28 d, their time compressive strength and rebound strength were detected. The results are shown in Table 1. In the present invention, the detection methods for the time compressive strength and rebound strength of the concrete specimens are mature technologies in the industry and will not be elaborated here.

[0053] Table 1 Thickness of the slurry on the side of the concrete, compressive strength of the specimens, and rebound strength in Examples 1 to 4

[0054]

[0055] As can be seen from Table 1, for the concrete in Example 1, the thickness of the slurry on the side measured by this device was 1.1 mm, the 28-day compressive strength was 37.3 MPa, and the 28-day rebound strength was 37.8 MPa. It can be seen that its rebound strength and compressive strength are relatively close; while for the concretes in Examples 2 and 3, the thickness of the slurry on the side measured gradually increased, and the difference between the 28-day rebound strength and the 28-day compressive strength also became larger, indicating that an increase in the thickness of the slurry on the side will significantly reduce the rebound strength of the concrete side; at the same time, by comparing Examples 3 and 4, it can be seen that by reducing the vibration time of the concrete, the thickness of the slurry on the side of the concrete can be reduced, thereby reducing the difference between the rebound strength and the compressive strength.

[0056] The present invention can quickly detect the thickness of the paste on the side of concrete, so as to timely adjust the state of the concrete, thereby reducing the paste on the side of the concrete. In actual engineering, this device is used to explore the law of vibration time and the thickness of the paste on the side, so as to provide guidance for the pouring and vibration of the concrete solid structure, which is conducive to the smooth acceptance of the concrete structure in the project.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood that the above are only partial embodiments of the present invention and are not used to limit the present invention. Therefore, any changes and improvements made to the above embodiments should be included within the protection scope of the claims of the present invention.

Claims

1. A device for measuring the thickness of slurry on the side of concrete, characterized in that, It includes a concrete container, a support beam, a vibrating rod, several filter meshes, a telescopic support and a combined transmission. The upper part of the concrete container is open. The two ends of the support beam are horizontally arranged at the upper opening of the concrete container. The head of the vibrating rod is installed on the support beam, and the lower end of the vibrating rod vertically extends into the concrete container. The combined transmission is connected to the support beam through a suspension rod. The filter mesh is an arc-shaped mesh adapted to the concrete container, and multiple filter meshes are installed circumferentially and spaced apart in the concrete container. Each filter mesh is equipped with a telescopic support. The telescopic support is installed on the combined transmission. The combined transmission provides power for the telescopic support. The telescopic end of the telescopic support is connected to the corresponding filter mesh, driving the filter mesh to move radially, approaching or moving away from the inner wall of the concrete container. The filter mesh is an arc-shaped wire mesh adapted to the concrete container, and the center of the inner side of the filter mesh is connected to the telescopic end of the telescopic support. After the concrete is stirred evenly, it is poured into the concrete container. After vibration and then standing still, the filter mesh moves radially inward, and the thickness S of the side slurry of the concrete is equal to the arithmetic mean of the radial distances between the inner wall of the concrete container and each filter mesh.

2. The concrete side slurry thickness measuring device according to claim 1, wherein, The combined transmission includes an annular bracket, a motor, a turbine and a worm. A through hole for the vibrating rod to pass through is provided at the center of the annular bracket. The motor is installed on the annular bracket. The motor is connected to the turbine of the reversing gear. The turbine meshes with the worm. The outer end of the worm is connected to one end of the telescopic support. When the motor rotates clockwise or counterclockwise, the worm moves in different directions, and the telescopic support expands and contracts back and forth.

3. The concrete side slurry thickness measuring device according to claim 1, characterized in that, The measuring device further includes a controller, which is respectively connected to the combined transmission and the vibrating rod, and is used to control the contraction of the telescopic support and the operation of the vibrating rod.

4. The concrete side slurry thickness measuring device according to claim 1, characterized in that, The concrete container is a cylindrical barrel. A positioning groove symmetrically arranged in the radial direction is provided at the upper edge of the concrete container. The two ends of the support beam are installed in the positioning groove.

5. The concrete side slurry thickness measuring device according to claim 1, characterized in that, A through hole for the vibrating rod to pass through is provided in the middle of the support beam.

6. The concrete side slurry thickness measuring device according to claim 1, wherein, The mesh holes of the filter mesh are square, and the side length of the mesh holes is 4.5 mm to 5.0 mm.

7. The concrete side slurry thickness measuring device according to claim 1, wherein There are 4 filter meshes. Correspondingly, there are 4 telescopic supports, which are arranged in a cross shape, and the intersection of the telescopic supports is connected through the combined transmission.

8. The concrete side slurry thickness measuring device according to claim 7, characterized in that, The combined transmission is provided with 4 motors that work independently, respectively controlling the expansion and contraction of the four telescopic supports, and the expansion and contraction speed thereof is not higher than 0.1 mm / s.

9. A method for measuring the thickness of the slurry on the side of concrete, characterized in that, This method includes the following steps: Step 1: Provide and install the measuring device described in any one of claims 1 to 8. Step 2: Pour the evenly stirred concrete into the concrete container. Step 3: The controller starts the vibrating rod to vibrate the concrete and then let it stand still. Step 4: The controller respectively controls the telescopic supports to contract through the combined transmission, driving the filter meshes to move radially inward. When the force value of a certain micro motor changes suddenly, then stop this micro motor until all four motors stop completely. Step 5: Respectively measure the radial distances between the inner wall of the concrete container and each filter mesh. Step 6: Calculate the thickness S of the side slurry of the concrete. The thickness S of the side slurry of the concrete is equal to the arithmetic mean of the radial distances between the inner wall of the concrete container and each filter mesh.

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