An intelligent testing device for the elastic modulus of concrete

Abstract

This invention relates to the field of concrete performance testing technology and proposes an intelligent testing device for the elastic modulus of concrete. The device includes a measuring platform and a dynamic measuring mechanism. Two measuring platforms are respectively positioned on either side of a hydraulic platform, and two dynamic measuring mechanisms are respectively mounted on the two measuring platforms. The dynamic measuring mechanisms are semi-circular and equipped with multiple laser rangefinders. These mechanisms are used to detect the strain on the surface of the concrete column. When the two dynamic measuring mechanisms rotate to a parallel angle, they form a circle. At this point, the multiple laser rangefinders can rotate around the concrete column and detect the strain in various directions. The dynamic measuring mechanism can rotate to an angle parallel to the measuring platform. This technical solution addresses the problem in existing technologies where the elastic modulus of concrete is measured with a relatively small strain, which may lead to errors in measurement and calculation.

Description

Technical Field

[0001] This invention relates to the field of concrete performance testing technology, specifically to an intelligent testing device for the elastic modulus of concrete. Background Technology

[0002] The core indicator of concrete elasticity is the modulus of elasticity. The commonly used testing method is the static method, which involves placing the concrete in a pressure testing machine, applying axial pressure to the concrete column using a servo hydraulic press, and measuring the lateral deformation of the concrete column. The static modulus of elasticity is then calculated using the stress-strain curve. However, due to the high hardness of concrete, the strain under pressure is very small, and there may be errors in the measurement and reading of the strain process on the concrete surface.

[0003] In the field of building engineering quality testing, the strain of concrete elastic modulus measurement is too small. Traditional testing methods require manual reading of specimen pressure and corresponding deformation during the testing process. The response speed of the test personnel is directly related to the accuracy of the test data. The test results are greatly affected by human interference, and there are many cases of parallel samples exceeding the tolerance. In addition, a single measurement requires repeated adjustments, which is time-consuming and restricts the testing efficiency. Summary of the Invention

[0004] This invention proposes an intelligent testing device for the elastic modulus of concrete, which solves the problem in the prior art that the elastic modulus of concrete is measured by strain, which may lead to errors in measurement and calculation.

[0005] The technical solution of the present invention is as follows: An intelligent testing device for the elastic modulus of concrete includes a hydraulic press with a hydraulic platform on which a concrete column is placed. It also includes a measuring platform, a dynamic measuring mechanism, and laser rangefinders. Two measuring platforms are slidably mounted on the hydraulic press, positioned on opposite sides of each platform. Two dynamic measuring mechanisms are mounted on the two measuring platforms and rotatably connected to them. Each dynamic measuring mechanism is semi-circular and equipped with multiple laser rangefinders. These mechanisms detect the strain on the surface of the concrete column. When the two dynamic measuring mechanisms rotate to a parallel angle, they form a circle, allowing the laser rangefinders to rotate around the concrete column and detect strain in various directions. The dynamic measuring mechanism can also rotate to an angle parallel to the measuring platforms, enabling the placement of the concrete column.

[0006] The hydraulic press has slide rails on both sides of its frame, and a drive cylinder is fixedly installed in each slide rail. The measuring platform is slidably connected to the slide rail, and the output end of the drive cylinder is fixedly connected to the measuring platform. The measuring platform can drive the dynamic measuring mechanism to move longitudinally on the slide rail.

[0007] A deflection platform is rotatably mounted on the side of the measuring platform near the concrete column, and the dynamic measuring mechanism is rotatably connected to the deflection platform.

[0008] The dynamic measurement mechanism includes an arc-shaped frame and a rotating bar. The arc-shaped frame is rotatably connected to the deflection platform. A rotating groove is provided inside the arc-shaped frame. The rotating bar is set as a semi-circle and is rotatably connected in the rotating groove. Multiple laser rangefinders are fixedly installed on the rotating bar.

[0009] After the two arc-shaped frames are rotated to a horizontal angle on the deflection platform, they can form a circle with the concrete column as the center. At this time, the ends of the two rotating bars abut each other, and both rotating bars can rotate in the rotating grooves on the two arc-shaped frames.

[0010] One of the arc-shaped frames has a transmission groove, in which a transmission gear is rotatably connected. A motor is fixedly installed on the arc-shaped frame, and the output end of the motor is connected to the transmission gear. Annular teeth are provided on one side of the two rotating bars facing the rotating groove, and the transmission gear meshes with the annular teeth.

[0011] When the two rotating bars abut each other, the rotation of the transmission gear can drive the two rotating bars to rotate in the two rotating slots. During rotation, the multiple laser rangefinders rotate around the concrete column.

[0012] When the two rotating bars abut each other, the output end of the drive cylinder can drive multiple laser rangefinders to move in the axial direction of the concrete column and measure the strain at multiple locations.

[0013] In this application, the process of pumping hydraulic oil is digitally controlled to precisely control the thrust output of the hydraulic press, and the pressure on the concrete column is accurately controlled and calculated. In addition, unlike traditional experimental methods, this application uses a laser rangefinder to measure the strain on the surface of the concrete column. The laser rangefinder does not actually contact the concrete column during the measurement, and the measured strain data can be recorded simultaneously.

[0014] Automated hydraulic loading technology: Hydraulic oil in the tank is drawn by an oil pump and transported to the inner cavity of the hydraulic press through an oil pipe. The incompressibility of the liquid causes the piston rod to move vertically upward, so that the hydraulic table generates a stable and controllable pressure output. The entire process is controlled by a digital controller that sends electrical signals to adjust the oil pump speed to precisely control the pressure and loading speed. By setting the mode, the pre-compression and formal testing of the specimen are completed automatically.

[0015] Non-contact displacement monitoring technology: By using high-precision laser rangefinders connected to both sides of the operating table to emit continuous laser beams at designated positions on the surface of the concrete column specimen and receiving reflected signals, the minute deformation of the specimen is calculated based on the optical path difference. At the same time, the collected data is transmitted in real time to a digital controller for storage and analysis to complete displacement quantification.

[0016] The working principle and beneficial effects of this invention are as follows: 1. In this invention, by setting a measuring platform, the test platform can slide longitudinally on the hydraulic press. During the process of driving the dynamic measuring mechanism to rise and fall, the dynamic measuring mechanism can correspond to various positions of the concrete column. Compared with the traditional method of measuring the strain at a fixed position on the concrete column by using multiple pressure gauges, this application can flexibly measure various positions. 2. In this invention, by setting up a dynamic measuring mechanism, a laser rangefinder can be positioned around the concrete column to measure the concrete column at a fixed distance. At the same time, a small number of laser rangefinders can be used to rotate around the concrete column to detect the strain on the side of the concrete column in 360 degrees, thus avoiding the problem that the strain at the measured position is different from that at other unmeasured positions. 3. This invention utilizes a measuring platform to freely adjust the measurement height. A dynamic measuring mechanism allows for the measurement of strain at various locations, preventing inconsistent data from different positions from affecting the final result. It also eliminates the need for frequent changes in the measurement position, enabling measurements to be taken at various points while rotating. A laser rangefinder allows for rapid and accurate measurements without contact with the concrete column, and the measured data is directly synchronized with the system, avoiding the inaccuracies and inadequacies often associated with manual data recording. The testing system is constructed using a hydraulic press combined with a digital controller and a high-precision laser rangefinder. A hydraulic pump drives a jack to load and simultaneously collect displacement data, establishing a dynamic stress-strain relationship model. An internal formula is used to automatically calculate the static compressive elastic modulus. This method significantly improves measurement accuracy, reduces human error, and drastically shortens testing time, ultimately ensuring more reliable and efficient concrete performance evaluation during construction, providing strong support for project progress control and cost savings. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another perspective in this invention; Figure 3 This is a partial structural diagram of the cooperation between the measuring platform and the dynamic measuring mechanism in this invention; Figure 4 This is a partial cross-sectional view of the dynamic measurement mechanism in this invention; Figure 5 This is a partial cross-sectional view of the rotating groove and rotating bar in this invention. Figure 6 This is a partial structural diagram of the interaction between the rotary bar and the transmission gear in this invention.

[0019] In the diagram: 1. Hydraulic press; 2. Hydraulic platform; 3. Measuring platform; 4. Laser rangefinder; 5. Slide rail; 6. Drive cylinder; 7. Deflection table; 8. Arc frame; 9. Rotary groove; 10. Rotary bar; 11. Transmission groove; 12. Transmission gear; 13. Motor; 14. Ring gear; 15. Oil pump. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1-6As shown in the figure, this embodiment proposes an intelligent testing device for the elastic modulus of concrete, including a hydraulic press 1, a hydraulic platform 2 installed in the hydraulic press 1, a concrete column placed on the hydraulic platform 2, a measuring base 3, a dynamic measuring mechanism, and laser rangefinders 4. Two measuring bases 3 are slidably mounted on the hydraulic press 1, respectively positioned on opposite sides of the hydraulic platform 2. Two dynamic measuring mechanisms are respectively mounted on the two measuring bases 3 and rotatably connected to them. The dynamic measuring mechanisms are semi-circular in shape and equipped with multiple laser rangefinders 4. The dynamic measuring mechanisms are used to detect the strain on the surface of the concrete column. When the two dynamic measuring mechanisms rotate to a parallel angle, they form a circle, at which point the multiple laser rangefinders 4... The laser rangefinder 4 can rotate around the concrete column and detect the strain in various directions of the concrete column. The dynamic measuring mechanism can rotate to an angle parallel to the measuring platform 3, at which point the concrete column can be placed. In this application, the laser rangefinder 4 is used to perform non-contact strain measurement, eliminating the need for manual observation of the pressure gauge or aligning the pressure gauge probe with the surface of the concrete column at a fixed position, greatly reducing the workload. At the same time, the non-contact nature of the laser rangefinder 4 allows it to detect multiple positions during movement. Compared with the traditional method of detecting only a few fixed positions, the data is more comprehensive, the detection positions are more diverse, and the accuracy is better, and it is less affected by the surface roughness of the concrete column.

[0022] like Figures 1-6 As shown, slide rails 5 are provided on both sides of the frame of the hydraulic press 1. A drive cylinder 6 is fixedly installed in each slide rail 5. The measuring platform 3 is slidably connected to the slide rail 5. The output end of the drive cylinder 6 is fixedly connected to the measuring platform 3. The measuring platform 3 can drive the dynamic measuring mechanism to move longitudinally on the slide rail 5. A deflection platform 7 is rotatably installed on the side of the measuring platform 3 near the concrete column. The dynamic measuring mechanism is rotatably connected to the deflection platform 7. The output end of the drive cylinder 6 drives the measuring platform 3 to rise and fall, thereby measuring various height positions of the concrete column. After the test is completed, the two rotating bars 10 rotate into the two arc-shaped frames 8 respectively. At this time, the arc-shaped frames 8 can rotate to a position close to both sides of the hydraulic press 1. At this time, the arc-shaped frames 8 do not wrap around the concrete column, and the concrete column can be moved. The arc-shaped frames 8 and the deflection table 7 can rotate so that the rotating groove 9 faces both sides of the hydraulic press 1, which facilitates the maintenance of the arc-shaped frames 8, rotating bars 10 and laser rangefinder 4. When the arc-shaped frames 8 rotate on the deflection table 7 to the angle for measurement or maintenance, they can be stopped at a fixed angle.

[0023] like Figures 1-6As shown, the dynamic measuring mechanism includes an arc frame 8 and a rotating bar 10. The arc frame 8 is rotatably connected to the deflection table 7. A rotating groove 9 is opened inside the arc frame 8. The rotating bar 10 is set as a semi-circle and is rotatably connected in the rotating groove 9. Multiple laser rangefinders 4 are fixedly installed on the rotating bar 10. Two rotating bars 10 abut to form a ring. When the arc frame 8 is docked, the rotating groove 9 also forms a ring. The rotating bar 10 can rotate in the rotating groove 9.

[0024] like Figures 4-6 As shown, the two arc-shaped frames 8 can form a circle after rotating to a horizontal angle on the deflection platform 7, with the concrete column as the center. At this time, the ends of the two rotating bars 10 abut each other, and both rotating bars 10 can rotate in the rotating grooves 9 on the two arc-shaped frames 8. The two ends of the rotating bars 10 are set opposite each other and can be connected to each other. After the connection, it is easy to push.

[0025] like Figures 5-6 As shown, one of the arc-shaped frames 8 has a transmission groove 11, and a transmission gear 12 is rotatably connected in the transmission groove 11. A motor 13 is fixedly installed on the arc-shaped frame 8, and the output end of the motor 13 is connected to the transmission gear 12. Two rotating bars 10 are provided with ring teeth 14 on one side facing the rotating groove 9. The transmission gear 12 meshes with the ring teeth 14. The output end of the motor 13 can drive the rotating bars 10 to rotate in the rotating groove 9, thereby driving the laser rangefinder 4 to rotate. The transmission gear 12 contacts the ring teeth 14 near the transmission groove 11, driving the two rotating bars 10 in sequence.

[0026] like Figures 4-6 As shown, when the two rotating bars 10 abut against each other, the transmission gear 12 rotates and drives the two rotating bars 10 to rotate in the two rotating grooves 9. During rotation, multiple laser rangefinders 4 rotate around the concrete column. When the two rotating bars 10 abut against each other, the output end of the drive cylinder 6 can drive multiple laser rangefinders 4 to move in the axial direction of the concrete column and measure the strain at multiple positions.

[0027] In this application, the hydraulic oil delivery process of the oil pump 15 is digitally controlled to precisely control the thrust output of the hydraulic press 1, and to accurately control and calculate the pressure on the concrete column. In addition, unlike traditional experimental methods, this application uses a laser rangefinder 4 to measure the strain on the surface of the concrete column. The laser rangefinder does not actually contact the concrete column during the measurement, and the measured strain data can be recorded synchronously.

[0028] Automated hydraulic loading technology: Hydraulic oil in the tank is drawn by oil pump 15 and transported to the inner cavity of hydraulic press 1 through oil pipe. The incompressibility of liquid causes the piston rod to move vertically upward, so that the hydraulic table 2 generates a stable and controllable pressure output. The entire process is controlled by the digital controller sending electrical signals to adjust the speed of oil pump 15 to precisely control the pressure and loading speed. By setting the mode, the pre-compression and formal testing of the specimen are completed automatically.

[0029] Non-contact displacement monitoring technology: By using high-precision laser rangefinders 4 connected to both sides of the operating table to emit continuous laser beams at designated positions on the surface of the concrete column specimen and receiving reflected signals, the minute deformation of the specimen is calculated based on the optical path difference. At the same time, the collected data is transmitted in real time to a digital controller for storage and analysis to complete displacement quantification.

[0030] In this embodiment, after the concrete column is placed on the hydraulic platform 2, two arc-shaped frames 8 can be rotated so that they form a circle around the concrete column. Under the control of the digital controller, the oil pump 15 supplies hydraulic oil to the hydraulic press 1, causing the hydraulic platform 2 to push the concrete column upward and compress it. At this time, multiple laser rangefinders 4 record the strain on the surface of the concrete column. The output end of the drive cylinder 6 extends or shortens to push the measuring platform 3 to slide on the slide rail 5, thereby driving the laser rangefinders 4 to rise and fall, measuring the strain on the surface of the concrete column at different heights. At the same time, the output end of the motor 13 drives the transmission gear 12 to rotate. The transmission gear 12 drives the rotating bar 10 to rotate in the rotating groove 9 through the ring gear 14. At this time, the laser rangefinders 4 rotate around the concrete column, thereby measuring the strain of the concrete column in various directions, completing the flexible measurement of the strain at various positions of the concrete column, and conveniently recording the data.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete elastic modulus intelligent test device, comprising a hydraulic machine (1), a hydraulic table (2) is arranged in the hydraulic machine (1), and a concrete column is placed on the hydraulic table (2), characterized in that, Also include: Two measuring pedestals (3) are slidably arranged on the hydraulic machine (1), and the two measuring pedestals (3) are arranged on the two sides of the hydraulic table (2) base respectively; Two dynamic measurement mechanisms are arranged on the two measuring pedestals (3) respectively and are rotatably connected with the measuring pedestals (3), the dynamic measurement mechanism is arranged in a semicircle shape, a plurality of laser range finders (4) are arranged on the dynamic measurement mechanism, and the dynamic measurement mechanism is used for detecting the strain of the surface of the concrete column; When the two dynamic measurement mechanisms are rotated to a parallel angle, a circle can be formed, at this time, the plurality of laser range finders (4) can rotate around the concrete column, and the strain in each direction of the concrete column can be detected; The dynamic measurement mechanism can be rotated to a parallel angle with the measuring pedestal (3), at this time, the concrete column can be placed.

2. The intelligent test device for concrete elastic modulus according to claim 1, characterized in that, The frame of the hydraulic machine (1) is provided with a slide rail (5) on both sides, a drive cylinder (6) is fixedly installed in the slide rail (5), the measuring pedestal (3) is slidably connected with the slide rail (5), the output end of the drive cylinder (6) is fixedly connected with the measuring pedestal (3), and the measuring pedestal (3) can drive the dynamic measurement mechanism to move longitudinally on the slide rail (5).

3. The concrete elastic modulus intelligent test device according to claim 2, characterized in that, A deflection table (7) is rotatably arranged on one side of the measuring pedestal (3) close to the concrete column, and the dynamic measurement mechanism is rotatably connected with the deflection table (7).

4. The intelligent test device for concrete elastic modulus according to claim 3, characterized in that, The dynamic measurement mechanism comprises: An arc-shaped frame (8) is rotatably connected with the deflection table (7), and a rotary groove (9) is formed in the arc-shaped frame (8); A rotary strip (10) is arranged in a semicircle shape and is rotatably connected in the rotary groove (9), and a plurality of laser range finders (4) are fixedly installed on the rotary strip (10).

5. The intelligent test device for concrete elastic modulus according to claim 4, characterized in that, After the two arc-shaped frames (8) are rotated to a horizontal angle on the deflection table (7), a circle can be formed with the concrete column as the center, at this time, the ends of the two rotary strips (10) abut against each other, and the two rotary strips (10) can rotate in the rotary grooves (9) on the two arc-shaped frames (8).

6. The intelligent test device for concrete elastic modulus according to claim 5, characterized in that, A transmission groove (11) is formed in one of the arc-shaped frames (8), a transmission gear (12) is rotatably connected in the transmission groove (11), a motor (13) is fixedly installed on the arc-shaped frame (8), the output end of the motor (13) is in transmission connection with the transmission gear (12), and annular teeth (14) are arranged on one side of the rotary strips (10) facing the rotary groove (9), and the transmission gear (12) is in meshing connection with the annular teeth (14).

7. The intelligent test device for concrete elastic modulus according to claim 6, characterized in that, When the two rotary strips (10) abut against each other, the rotation of the transmission gear (12) can drive the two rotary strips (10) to rotate in the two rotary grooves (9), and the plurality of laser range finders (4) rotate around the concrete column during rotation.

8. The intelligent test device for concrete elastic modulus according to claim 5, characterized in that, When the two rotary strips (10) abut against each other, the output end of the drive cylinder (6) can drive the plurality of laser range finders (4) to move in the axial direction of the concrete column, and the strain at a plurality of positions can be measured.

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