A device for detecting the load-bearing capacity and deformation of cantilever beams

Abstract

This utility model provides a device for detecting the load-bearing capacity and deformation of a cantilever beam, relating to the field of cantilever beam load-bearing capacity testing technology. It is used to test cantilever beams and includes: a mounting plate fixed above the cantilever beam, on which a hydraulic jack is mounted, the hydraulic jack contacting the cantilever beam via a pressure sensor; and a deformation displacement dial gauge connected to the mounting plate via a telescopic arm, with the dial gauge's pin abutting upwards against the lower surface of the cantilever beam. The beneficial effects of this utility model are: the upper part of the cantilever beam is equipped with a high-strength steel plate that is resistant to deformation under load reaction force; the hydraulic jack on the beam can simulate the load applied to the cantilever beam; several pressure sensors are installed below the hydraulic jack to monitor the magnitude of the load on different positions of the cantilever beam in real time; and the bottom plate of the cantilever beam is equipped with a deformation displacement dial gauge and strain gauges to detect the deflection deformation and cracks of the cantilever beam under load.

Description

Technical Field

[0001] This utility model relates to the field of cantilever beam load-bearing capacity testing technology, and in particular to a cantilever beam load-bearing capacity and deformation testing device. Background Technology

[0002] Existing cantilever beams have a series of safety issues: for example, the design cross-sectional dimensions are too small, and the bending and shear bearing capacity does not meet the load requirements; the concrete is not poured densely, and there are honeycomb and voids (which weaken the cross-sectional strength); the formwork support is removed too early, and the concrete has not reached the design strength, etc. As a suspended load-bearing component in a building or bridge that is fixed at one end and unsupported at the other end, the safety hazards of the cantilever beam are directly related to the stability and safety of the overall structure.

[0003] Therefore, the safety and stability of cantilever structures should be the top priority in actual engineering projects. However, the existing on-site testing technology is too rudimentary or even non-existent, and some testing equipment is too complex and cumbersome to operate, resulting in poor practical operability. It is urgent to solve the problem of how to easily and conveniently detect the stress of cantilever beams in real time. Utility Model Content

[0004] In view of this, the present invention provides a cantilever beam load-bearing capacity and deformation detection device to solve the problem of the lack of a corresponding detection device for cantilever beam load-bearing capacity and deformation in the prior art.

[0005] An embodiment of this utility model provides a device for detecting the bearing capacity and deformation of cantilever beams, used for detecting cantilever beams, including:

[0006] An mounting plate is fixed above the cantilever beam, and a hydraulic jack is mounted on the mounting plate. The hydraulic jack is in contact with the cantilever beam through a pressure sensor.

[0007] A deformation displacement dial indicator is connected to the mounting plate via a telescopic arm, and the pin of the deformation displacement dial indicator abuts against the lower surface of the cantilever beam.

[0008] Multiple strain gauges are evenly spaced on the surface of the cantilever beam. Stress is applied to the pressure sensor and the cantilever beam by a hydraulic jack to simulate the state of the cantilever beam under load. The cantilever beam deforms under load, causing the pin of the deformation displacement dial gauge that abuts against the lower surface of the cantilever beam to change position. The change in the value of the deformation displacement dial gauge is the amount of deformation.

[0009] Furthermore, the mounting plate is fixed to the cantilever beam by a connecting member. The connecting member includes two lateral clamps and through bolts. Each lateral clamp has a through bolt hole. The through bolt is threaded to the two through bolt holes so that the two lateral clamps are clamped to the outside of the fixed structure, and one lateral clamp is connected to the mounting plate.

[0010] Furthermore, the telescopic arm is provided with a magnetic base at the end away from the deformation displacement dial gauge, and a magnetic switch is provided on the magnetic base to control its magnetism.

[0011] Furthermore, the hydraulic jack is provided with an inner extension rod, which is the telescopic end of the hydraulic jack and is connected to the lower surface of the mounting plate.

[0012] Furthermore, there are multiple pressure sensors, each of which is in contact with the hydraulic jack via a forming plate.

[0013] Furthermore, multiple strain gauges are connected to the cantilever beam by adhesive bonding.

[0014] Furthermore, a fixing structure is provided on one side of the cantilever beam, the fixing structure including at least two columns and an inner span beam, the inner span beam and each of the columns are vertically connected, and the two lateral clamps are clamped outside one of the columns.

[0015] Furthermore, all of the strain gauges and pressure sensors are connected to a computer via signals to transmit detection data.

[0016] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: The cantilever beam bearing capacity and deformation detection device of this utility model has a high-strength steel plate on the upper part of the cantilever beam that is not easily deformed by the loading reaction force. A hydraulic jack is installed on the beam to simulate the load loaded on the cantilever beam. Several pressure sensors are installed below the hydraulic jack to monitor the magnitude of the load on different positions of the cantilever beam in real time. The bottom plate of the cantilever beam is equipped with a deformation displacement dial gauge and strain gauges to detect the deflection deformation and cracks of the cantilever beam under loading. This device can quickly detect the load on each cantilever beam of different spans. This data can be recorded in real time via computer, enabling intelligent monitoring and dynamic early warning of cantilever beams in buildings; it can accurately predict the ultimate bearing capacity and deformation of cantilever beams with different spans, analyze the actual stress at various locations of the cantilever beam, provide relevant basis for structural design, and provide a high degree of assurance for structural safety; it can provide the threshold values ​​of the ultimate point load and ultimate uniformly distributed load that cantilever beams with different spans can withstand, and combine this with software calculations for structural design to optimize the cross-section design of the cantilever beam; the device has a simple overall structure, is easy to operate, has good practical operability, and has high application prospects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the cantilever beam load-bearing capacity and deformation detection device of this utility model;

[0018] Figure 2 This is a side view of the connecting component of the cantilever beam load-bearing capacity and deformation detection device of this utility model;

[0019] Figure 3 This is a schematic diagram of another embodiment of the cantilever beam load-bearing capacity and deformation detection device of this utility model.

[0020] In the diagram: 1. Cantilever beam; 2. Inner span beam; 3. Column; 4. Mounting plate; 5. Hydraulic jack; 51. Inner extension rod; 6. Pressure sensor; 7. Magnetic base; 71. Magnetic switch; 8. Telescopic arm; 9. Deformation displacement dial gauge; 91. Ejector pin; 10. Connecting component; 101. Side clamp; 102. Through bolt hole; 103. Through bolt; 11. Strain gauge; 12. Profiled sheet; 13. Computer terminal. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0025] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0026] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1: Please refer to Figures 1 to 2 An embodiment of this utility model provides a cantilever beam bearing capacity and deformation detection device, including a mounting plate 4, a hydraulic jack 5, a deformation displacement dial gauge 9, and multiple strain gauges 11.

[0028] In this embodiment, the cantilever beam 1 is installed and fixed by a fixing structure, which includes at least two columns 3 and an inner span beam 2. The columns 3 and the inner span beam 2 are vertically connected to form a stable support frame. The end of the cantilever beam 1 is fixed to the inner span beam 2 to ensure that the cantilever beam 1 has good stability when under stress.

[0029] This connection method can effectively distribute the force on the cantilever beam 1, avoid local stress concentration, and thus improve the accuracy of the test.

[0030] Furthermore, the mounting plate 4 is fixed to the fixed structure by the connecting member 10. The connecting member 10 includes two lateral clamping plates 101 and through bolts 103. The two lateral clamping plates 101 are relatively close to each other and clamped on the outside of the column 3 in the fixed structure. The through bolts 103 pass through the through screw holes 102 on the lateral clamping plates 101 to lock the two lateral clamping plates 101 to the column 3.

[0031] The mounting plate 4 is made of high-strength steel plate that can withstand the load reaction force and is not easily deformed. The lateral clamp 101 on one side is fixedly connected to the mounting plate 4, so that the mounting plate 4 can be set outside the column 3 and suspended above the cantilever beam 1.

[0032] In this embodiment, the inner extension rod 51 of the hydraulic jack 5 is the telescopic end of the hydraulic jack 5 and is connected to the lower surface of the mounting plate 4. The inner extension rod 51 is fixed to the mounting plate 4 by means of threads or welding to ensure that the hydraulic jack 5 will not displace or loosen when stress is applied, thus ensuring the stability of the hydraulic jack 5 and ensuring that the applied stress is uniform and controllable.

[0033] Example 2: Please refer to Figure 3 There are multiple pressure sensors 6, and each pressure sensor 6 is in contact with the hydraulic jack 5 through the forming plate 12.

[0034] This design can simulate the magnitude of loads applied to different locations on the cantilever beam 1 and record this data via computer. If the data under a certain load changes drastically, it indicates structural failure of the cantilever beam 1. This load represents the threshold of the maximum point load and uniformly distributed load that the cantilever beam 1 can withstand, i.e., its ultimate bearing capacity. It can predict the ultimate bearing capacity and deformation of cantilever beams 1 with different spans, analyze the actual stress conditions at various locations on the cantilever beam 1, providing relevant basis for structural design and a higher guarantee of structural safety. It provides the threshold of the maximum point load and uniformly distributed load that the cantilever beam 1 with different spans can withstand. Combined with structural design software calculations, it optimizes the cross-section design of the cantilever beam 1. It also enables intelligent monitoring of the building's cantilever beam 1 to achieve dynamic early warning.

[0035] In this embodiment, the deformation displacement dial gauge 9 is connected to the mounting plate 4 via a telescopic arm 8. A magnetic base 7 is provided at the end of the telescopic arm 8 away from the deformation displacement dial gauge 9, and a magnetic switch 71 is provided on the magnetic base 7 to control its magnetism.

[0036] It should be noted that the magnetic base 7 is attached to the mounting plate 4. The magnetic switch 71 can be used to easily adjust whether the magnetic base 7 has an adsorption force, so as to facilitate the installation of the telescopic arm 8 on the mounting plate 4.

[0037] The pin 91 of the deformation displacement dial gauge 9 gently abuts against the lower surface of the cantilever beam 1, ensuring that the pin 91 is in close contact with the surface of the cantilever beam 1. This allows for flexible adjustment of the position of the deformation displacement dial gauge 9 to adapt to cantilever beams 1 of different heights and shapes, while ensuring measurement accuracy.

[0038] More specifically, the magnetic base 7 is an electromagnet, and the magnetic switch 71 is used to control the on / off state of its circuit, thereby changing its magnetism.

[0039] In this embodiment, the strain gauge 11 is attached to the surface of the cantilever beam 1 by pasting. Before pasting, the surface of the cantilever beam 1 needs to be cleaned and polished to ensure that the strain gauge 11 is tightly attached to the surface of the cantilever beam 1. The strain gauges 11 are evenly spaced on the surface of the cantilever beam 1, which can evenly distribute the measurement points and comprehensively reflect the strain of the cantilever beam 1 under stress.

[0040] Furthermore, multiple strain gauges 11 and pressure sensors 6 are connected to the computer terminal 13 via signal lines. The signal lines are shielded cables, which can effectively prevent electromagnetic interference and ensure the stability of signal transmission.

[0041] The computer terminal 13 receives and processes the data transmitted by the strain gauge 11 and the pressure sensor 6, and generates the load-deformation curve of the cantilever beam 1 through analysis software. This data processing method can monitor the stress state of the cantilever beam 1 in real time, discover potential problems in a timely manner, and provide a scientific basis for structural performance evaluation.

[0042] During implementation, installation will be carried out:

[0043] The cantilever beam 1 is installed on the building structure via a fixed structure, ensuring a firm connection between the cantilever beam 1 and the fixed structure. The mounting plate 4 is fixed to the fixed structure via a connecting member 10. The position of the mounting plate 4 is adjusted to be parallel to the cantilever beam 1. A hydraulic jack 5 and a pressure sensor 6 are installed between the mounting plate 4 and the cantilever beam 1, ensuring a firm connection between the inner extension rod 51 of the hydraulic jack 5 and the lower surface of the mounting plate 4. A displacement gauge 9 is connected to the mounting plate 4 via a telescopic arm 8. The length of the telescopic arm 8 is adjusted so that the pin 91 of the displacement gauge 9 gently abuts against the lower surface of the cantilever beam 1. Strain gauges 11 are attached to the surface of the cantilever beam 1 at equal intervals, ensuring a tight fit between the strain gauges 11 and the surface of the cantilever beam 1. The pressure sensor 6 and the strain gauges 11 are connected to the computer terminal 13 via signal lines, ensuring stable signal transmission.

[0044] Testing process:

[0045] Start the hydraulic jack 5 and gradually apply stress to the cantilever beam 1. Observe the changes in the value of the deformation displacement dial gauge 9 and record the deformation of the cantilever beam 1. At the same time, receive and record the data transmitted by the strain gauge 11 and the pressure sensor 6 through the computer terminal 13. Based on the recorded data, analyze the load-bearing capacity and deformation characteristics of the cantilever beam 1 and evaluate its structural performance.

[0046] Data processing:

[0047] The collected deformation, strain, and pressure data are input into the analysis software on the computer 13. The analysis software processes and analyzes the data to generate the load-deformation curve of the cantilever beam 1. The load-bearing capacity and deformation performance of the cantilever beam 1 are evaluated based on the curve to determine whether it meets the design requirements.

[0048] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0049] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting the bearing capacity and deformation of a cantilever beam, used to detect a cantilever beam (1), characterized in that, include: Mounting plate (4) is fixed above the cantilever beam (1). A hydraulic jack (5) is mounted on the mounting plate (4). The hydraulic jack (5) contacts the cantilever beam (1) through a pressure sensor (6). A deformation displacement dial gauge (9) is connected to the mounting plate (4) via a telescopic arm (8), and the pin (91) of the deformation displacement dial gauge (9) abuts upward against the lower surface of the cantilever beam (1). And multiple strain gauges (11) are evenly spaced on the surface of the cantilever beam (1). Stress is applied to the pressure sensor (6) and the cantilever beam (1) by a hydraulic jack to simulate the state of the cantilever beam (1) under load. The cantilever beam (1) deforms under load, causing the pin (91) of the deformation displacement percentage gauge (9) abutting against the lower surface of the cantilever beam (1) to change position. The change in the value of the deformation displacement percentage gauge (9) is the amount of deformation.

2. The cantilever beam bearing capacity and deformation detection device as described in claim 1, characterized in that: The mounting plate (4) is fixed to the cantilever beam (1) by a connecting member (10). The connecting member (10) includes two side clamps (101) and through bolts (103). Each side clamp (101) is provided with through bolt holes (102). The through bolts (103) are threaded to the two through bolt holes (102) so that the two side clamps (101) are clamped to the outside of the structure of the cantilever beam (1). One side clamp (101) is connected to the mounting plate (4).

3. The cantilever beam bearing capacity and deformation detection device as described in claim 1, characterized in that: The telescopic arm (8) is provided with a magnetic base (7) at the end away from the deformation displacement dial gauge (9), and the magnetic base (7) is provided with a magnetic switch (71) to control its magnetism.

4. The cantilever beam bearing capacity and deformation detection device as described in claim 1, characterized in that: The hydraulic jack (5) is provided with an inner extension rod (51), which is the telescopic end of the hydraulic jack (5) and is connected to the lower surface of the mounting plate (4).

5. The cantilever beam bearing capacity and deformation detection device as described in claim 1, characterized in that: There are multiple pressure sensors (6), and each pressure sensor (6) is in contact with the hydraulic jack (5) through a molding plate (12).

6. The cantilever beam bearing capacity and deformation detection device as described in claim 1, characterized in that: Multiple strain gauges (11) are connected to the cantilever beam (1) by means of adhesive bonding.

7. The cantilever beam bearing capacity and deformation detection device as described in claim 2, characterized in that: The cantilever beam (1) has a fixed structure on one side, which includes at least two columns (3) and an inner span beam (2). The inner span beam (2) and each of the columns (3) are vertically connected, and the two lateral clamps (101) are clamped outside one of the columns (3).

8. The cantilever beam bearing capacity and deformation detection device as described in claim 1 or 5, characterized in that: The strain gauges (11) and the pressure sensors (6) are all connected to the computer (13) via signals to transmit detection data.

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