Stress sensor fixing device in health monitoring of rectangular steel truss girder

Abstract

The utility model provides a stress sensor fixing device in health monitoring of a rectangular steel truss girder, which belongs to the technical field of steel truss girders and comprises four fixing supports and fixing bolts. The fixing supports comprise the first fixing support, the second fixing support, the third fixing support and the fourth fixing support, each fixing support is provided with two bolt holes, each bolt hole penetrates through the corresponding fixing support, and the length of each fixing bolt is larger than the sum of the long edge and the short edge of the corresponding fixing support; stress sensor clamping seats are welded on the fixed supports, the stress sensor clamping seats are reinforced on the fixed supports through screws, reserved bolt holes are formed in the bottoms of the fixed supports, and the reserved bolt holes are used for connecting the adjacent fixed supports. The fixing device overcomes the defects that a traditional fixing device is poor in stability and inconvenient to mount and dismount.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steel truss beam technical field, more particularly, relate to a rectangular steel trratruss beam health monitoring stress sensor fixing device. BACKGROUND

[0002] Rectangular steel truss beam is a kind of beam made of steel material with rectangular cross-sectional shape and by the node connection of multiple bar members to form truss structure.It is widely used in numerous engineering fields such as building, bridge, machinery, etc., because it has good mechanical properties, can bear larger load and effectively transfer force.In building structure, it is often used for large-span roof structure;In the field of bridge, it can be used as the main load-bearing structural component of bridge.Stress sensor is a kind of instrument and equipment that can sense and measure the stress of object inside.Stress sensor plays a crucial role in engineering structure health monitoring, it can monitor the stress state of structure in real time, provide key data basis for safety evaluation, maintenance decision and life prediction of structure.Sensor fixing device: it is a specific device for fixing stress sensor on rectangular steel truss beam.

[0003] In the health monitoring of rectangular steel truss beam, traditional stress sensor fixing device has many drawbacks.Some traditional fixing devices adopt welding method to weld sensor directly on the surface of steel truss beam.This method can realize relatively firm fixing, but has some problems that cannot be ignored.Firstly, welding process will produce thermal influence on local structure of steel truss beam, which may cause the change of metallographic structure of steel, thereby reducing the local strength and toughness, and affecting the mechanical properties and structural safety of steel truss beam as a whole.Secondly, welded sensor is difficult to disassemble and replace, if sensor fails or needs to be maintained and upgraded, complex cutting and repair work is needed, which not only consumes time and effort, but also may further damage the structure of steel truss beam.In addition, some traditional fixing devices adopt simple clamping or bonding method.Clamping method is often difficult to adapt to rectangular steel truss beams of different cross-sectional sizes, and may not provide enough clamping force for beams with large cross-sectional size, resulting in insecure fixing of sensor;And the adhesive of bonding method may age and fail under the long-term environmental action (such as temperature change, humidity change, ultraviolet radiation, etc.), causing the sensor to fall off or loosen, and unable to guarantee the continuity and accuracy of measurement.In summary, traditional stress sensor fixing device is difficult to meet the requirements of high precision, high stability, easy installation and disassembly and wide applicability for sensor fixing in the health monitoring of rectangular steel truss beam, so it is necessary to develop a new type of sensor fixing device. UTILITY MODEL CONTENT

[0004] Therefore, the stress sensor fixing device in the health monitoring of the rectangular steel truss girder provided by the utility model solves the poor stability and inconvenient installation and dismounting of the traditional fixing device, and improves the stability and operation convenience.

[0005] The utility model is implemented as follows:

[0006] The utility model provides a kind of stress sensor fixing device in the health monitoring of rectangular steel truss girder, wherein, including four fixed supports and fixed bolt, the fixed support is L-shaped, the fixed support includes first fixed support, second fixed support, third fixed support and fourth fixed support, two bolt holes are provided on each fixed support, each bolt hole is respectively penetrated through the fixed support, the fixed bolt length is greater than the sum of long side and short side of the fixed support;

[0007] Stress sensor holder is welded on the fixed support, the stress sensor holder is reinforced on the fixed support by screw, the bottom of the fixed support is provided with reserved bolt hole, and the reserved bolt hole is used to connect adjacent fixed supports.

[0008] The stress sensor fixing device in the health monitoring of rectangular steel truss girder provided by the utility model has the following technical effects: four L-shaped steel fixed supports and support fixed bolts are matched, can be stably installed on rectangular steel truss girder, provide reliable installation basis for stress sensor, and the structure is simple, easy to manufacture and assemble, and production cost is reduced.

[0009] On the basis of the above technical scheme, the stress sensor fixing device in the health monitoring of rectangular steel truss girder of the utility model can also be improved as follows:

[0010] The first fixed support, the second fixed support, the third fixed support and the fourth fixed support are all L-shaped steel, and the first fixed support, the second fixed support, the third fixed support and the fourth fixed support are integrally formed in a rectangular shape.

[0011] The beneficial effects of the above improved scheme are that the two edges of the L-shaped steel fixed support are perpendicular to each other, and the included angle between the short edge and the long edge is 90 degrees. The right angle structure of 90 degrees is convenient for closely fitting with the right angle edge of the rectangular steel truss girder, ensures the stability and accuracy of installation, so that the fixing device can better adapt to the shape characteristics of the rectangular steel truss girder during installation, and reduces installation error.

[0012] Further, the L-shaped steel includes a long side and a short side, the long side of the first fixed support is connected with the short side of the second fixed support, the long side of the second fixed support is connected with the short side of the third fixed support, the long side of the third fixed support is connected with the short side of the fourth fixed support, and the long side of the fourth fixed support is connected with the short side of the first fixed support.

[0013] Further, the fixed bolt includes a first support fixed bolt, a second support fixed bolt, a third support fixed bolt and a fourth support fixed bolt, the first support fixed bolt is located between the long side of the first fixed support and the short side of the second fixed support, the second support fixed bolt is located between the long side of the second fixed support and the short side of the third fixed support, the third support fixed bolt is located between the long side of the third fixed support and the short side of the fourth fixed support, and the fourth support fixed bolt is located between the long side of the fourth fixed support and the short side of the first fixed support.

[0014] Further, the two bolt holes are distributed on the outside of the fixed support and are symmetrical about the geometric center of the fixed support.

[0015] The beneficial effects of the above improvement scheme are that the symmetrical bolt holes can make the support fixed bolt bear force evenly during installation, avoid deformation or loosening of the fixed device caused by uneven force, improve the stability and reliability of the device as a whole, and prolong the service life.

[0016] Further, the stress sensor card holder is welded to the outside surface of the long side of the first fixed support, and the welding position is located on the center line of the long side.

[0017] Further, the bolt hole includes a first hole and a second hole, the first hole is located near the corner of the long side of the fixed support, the second hole is located near the corner of the short side of the fixed support, and the projections of the first hole and the second hole are axisymmetric.

[0018] Further, the reserved bolt hole is located at the bottom of the fixed support, and the reserved bolt hole is linearly connected with the first hole or the second hole, respectively.

[0019] Further, the diameters of the reserved bolt hole, the first hole and the second hole are the same.

[0020] Further, the stress sensor card holder is located at the end of the long side of the overall rectangular fixed support, close to the center of the top of the rectangle.

[0021] Compared with the prior art, the stress sensor fixing device for health monitoring of the rectangular steel truss beam has the beneficial effects that:

[0022] The rectangular steel truss beam sensor fixing device is matched with the support fixing bolt with a length greater than the sum of the long side and the short side of the L-shaped steel fixing support through four L-shaped steel fixing supports with the same size and bolt holes. The structure design makes the fixing device closely adhere to the rectangular steel truss beam, the four L-shaped steel fixing supports embrace the steel truss beam from different directions, the support fixing bolt provides strong fastening force, and effectively prevents displacement, loosening or deformation of the fixing device under the action of external force (such as stress change caused by vibration, wind load, structure self weight and external load, etc.). For example, in the bridge structure, the vibration generated by the vehicle driving and the wind action cannot easily cause the sensor fixing device to fail, which ensures that the stress sensor can continuously and stably work, thereby providing reliable data support for the health monitoring of the bridge structure.

[0023] The installation method is simple and the steps are clear. The installation of the fixing device on the rectangular steel truss beam is completed by sequentially passing the support fixing bolt through the bolt hole of the corresponding L-shaped steel fixing support, without the need for complex installation tools and professional skill requirements. Ordinary technical workers can quickly complete the installation according to the operation steps, greatly improving the installation efficiency and reducing the installation cost. In the construction site, when a large number of rectangular steel truss beam structures need to be installed with stress sensor fixing devices, the simple and easy installation method can significantly shorten the construction period and improve the engineering progress.

[0024] The utility model can adapt to rectangular steel truss beams with different cross-sectional sizes by adjusting the support fixing bolt. When the support fixing bolt is adjusted to the shortest, the rectangle surrounded by the L-shaped steel fixing support is inscribed in the rectangular steel truss beam with the smallest cross-sectional size. When it is adjusted to the longest, the rectangle surrounded is circumscribed in the rectangular steel truss beam with the largest cross-sectional size. This adjustment method greatly improves the versatility of the fixing device, without the need for specially designing and manufacturing different specifications of fixing devices for steel truss beams of different sizes. In the bridge construction engineering, various rectangular steel truss beam structures with different cross-sectional sizes are often involved. The use of the fixing device can greatly reduce the types and inventory management cost of the fixing device, and also facilitates the application in different engineering scenes and improves the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an example diagram of a stress sensor fixing device for health monitoring of a rectangular steel truss beam;

[0027] Figure 2 This is an example diagram of bolt holes for a stress sensor fixing device in a health monitoring system for a rectangular steel truss beam.

[0028] Figure 3 Example diagram of reserved bolt holes for a stress sensor fixing device in health monitoring of a rectangular steel truss beam;

[0029] Figure 4 An example diagram of a stress sensor mounting device for health monitoring of rectangular steel truss beams;

[0030] Figure 5 This is a diagram illustrating the usage status of a stress sensor fixing device in health monitoring of a rectangular steel truss beam.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Fixed support; 11. First fixed support; 12. Second fixed support; 13. Third fixed support; 14. Fourth fixed support; 15. Reserved bolt hole; 20. Fixing bolt; 21. First support fixing bolt; 22. Second support fixing bolt; 23. Third support fixing bolt; 24. Fourth support fixing bolt; 30. Stress sensor holder; 40. Screw; 50. Bolt hole; 51. First hole; 52. Second hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-5The image shows a first embodiment of a stress sensor fixing device for health monitoring of a rectangular steel truss beam provided by this utility model. In this embodiment, it includes four fixing supports 10 and fixing bolts 20. The fixing supports 10 are L-shaped and include a first fixing support 11, a second fixing support 12, a third fixing support 13 and a fourth fixing support 14. Each fixing support 10 is provided with two bolt holes 50, and each bolt hole 50 passes through the fixing support 10. The length of the fixing bolt 20 is greater than the sum of the long side and the short side of the fixing support 10.

[0035] A stress sensor holder 30 is welded onto the fixed support 10. The stress sensor holder 30 is reinforced to the fixed support 10 by screws 40. The bottom of the fixed support 10 is provided with a reserved bolt hole 15, which is used to connect adjacent fixed supports 10.

[0036] Includes the following steps:

[0037] Place a first fixed support and a second fixed support on the steel truss beam, and insert the fixing bolts of the first support into the short side bolt holes (i.e., the second holes) on the second fixed support and the corresponding long side reserved bolt holes on the first fixed support in sequence.

[0038] The third fixed support is connected to the second fixed support by the second fixed support fixing bolt, wherein the second fixed support fixing bolt is inserted into the short side bolt hole (i.e. the second hole) on the third fixed support, and then into the corresponding long side reserved bolt hole on the second fixed support.

[0039] The fourth fixed support is connected to the third fixed support by the third fixed support fixing bolt. The third fixed support fixing bolt is inserted through the short side bolt hole (i.e. the second hole) on the fourth fixed support and then through the corresponding long side reserved bolt hole on the third fixed support.

[0040] The fourth fixed support is connected to the first fixed support by the fourth fixed support fixing bolt. The fourth fixed support fixing bolt is inserted through the short side bolt hole (i.e. the second hole) on the first fixed support and then through the corresponding long side reserved bolt hole on the fourth fixed support.

[0041] In the above technical solution, the first fixed support 11, the second fixed support 12, the third fixed support 13 and the fourth fixed support 14 are all identical L-shaped steels, and the first fixed support 11, the second fixed support 12, the third fixed support 13 and the fourth fixed support 14 are collectively arranged in a rectangular shape.

[0042] Furthermore, in the above technical solution, the L-shaped steel includes a long side and a short side. The long side of the first fixed support 11 is connected to the short side of the second fixed support 12. The long side of the second fixed support 12 is connected to the short side of the third fixed support 13. The long side of the third fixed support 13 is connected to the short side of the fourth fixed support 14. The long side of the fourth fixed support 14 is connected to the short side of the first fixed support 11.

[0043] Furthermore, in the above technical solution, the fixing bolt 20 includes a first support fixing bolt 21, a second support fixing bolt 22, a third support fixing bolt 23, and a fourth support fixing bolt 24. The first support fixing bolt 21 is located between the long side of the first fixed support 11 and the short side of the second fixed support 12. The second support fixing bolt 22 is located between the long side of the second fixed support 12 and the short side of the third fixed support 13. The third support fixing bolt 23 is located between the long side of the third fixed support 13 and the short side of the fourth fixed support 14. The fourth support fixing bolt 24 is located between the long side of the fourth fixed support 14 and the short side of the first fixed support 11.

[0044] Furthermore, in the above technical solution, the two bolt holes 50 are distributed on the outside of the fixed support 10 and are symmetrical about the geometric center of the fixed support 10.

[0045] Furthermore, in the above technical solution, the stress sensor holder 30 is welded to the outer surface of the long side of the first fixed support 11, and its welding position is located on the center line of the long side.

[0046] Furthermore, in the above technical solution, the bolt hole 50 includes a first hole 51 and a second hole 52. The first hole 51 is located on the long side of the fixed support 10 near the corner, and the second hole 52 is located on the short side of the fixed support 10 near the corner. The projections of the first hole 51 and the second hole 52 are symmetrical about the axis.

[0047] Furthermore, in the above technical solution, the reserved bolt hole 15 is located at the bottom of the fixed support 10, and the reserved bolt hole 15 is directly connected to the first hole 51 or the second hole 52 respectively.

[0048] Furthermore, in the above technical solution, the diameters of the reserved bolt hole 15, the first hole 51, and the second hole 52 are the same.

[0049] Furthermore, in the above technical solution, the stress sensor holder 30 is located at the end of the long side of the overall rectangle of the fixed support 10, near the center of the top of the rectangle.

[0050] Specifically, the principle of this utility model is as follows:

[0051] From a mechanical perspective, when a rectangular steel truss beam is subjected to external loads, stress distribution occurs within it. A stress sensor, by being in close contact with the steel truss beam and fixed at a specific location, can detect this stress change and convert it into a measurable physical signal (such as changes in resistance or capacitance, depending on the sensor type). The structural system of the L-shaped steel fixing support and its fixing bolts in this fixing device serves to stably fix the stress sensor to the steel truss beam and effectively transmit stress. For example, the preload generated by tightening the fixing bolts creates friction between the L-shaped steel fixing support and the steel truss beam. This friction resists the relative sliding tendency caused by external loads, thus ensuring the positional stability of the fixing device on the beam. Simultaneously, the shape and distribution of the L-shaped steel fixing support allow it to deform along with the steel truss beam under stress without generating excessive constraint stress, ensuring that the stress is naturally transmitted to the stress sensor, enabling the sensor to accurately measure the true stress value.

[0052] From a structural design perspective, the layout of the four L-shaped steel fixed supports forms a stable, embracing structure. With the center of the rectangular steel truss beam's cross-section as the center of symmetry, the L-shaped steel fixed supports are distributed around the beam, connected by support fixing bolts to form a spatial force-bearing system. This layout constrains the steel truss beam from multiple directions, similar to a spatial frame structure that securely encloses stress sensors. During the design process, the size, shape, and bolt hole positions and numbers of the L-shaped steel fixed supports were all considered to achieve optimal force transfer and structural stability. For example, the ratio of the long to short sides of the L-shaped steel fixed supports and the shape of their contact surfaces with the steel truss beam are designed to ensure sufficient contact area to generate adequate friction while adapting to the right-angled edge shape of the rectangular steel truss beam, reducing stress concentration. The symmetrical distribution of the bolt holes and their matching design with the support fixing bolts ensure that the entire fixing device can evenly distribute force to all components when under load, preventing structural damage or connection failure due to excessive localized stress.

Claims

1. A stress sensor fixing device for health monitoring of rectangular steel truss beams, characterized in that, It includes four fixed supports (10) and fixed bolts (20). The fixed supports (10) are L-shaped. The fixed supports (10) include a first fixed support (11), a second fixed support (12), a third fixed support (13) and a fourth fixed support (14). Each fixed support (10) is provided with two bolt holes (50). Each bolt hole (50) passes through the fixed support (10). The length of the fixed bolt (20) is greater than the sum of the long side and the short side of the fixed support (10). A stress sensor holder (30) is welded onto the fixed support (10). The stress sensor holder (30) is reinforced to the fixed support (10) by screws (40). A reserved bolt hole (15) is provided at the bottom of the fixed support (10). The reserved bolt hole (15) is used to connect adjacent fixed supports (10).

2. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 1, characterized in that, The first fixed support (11), the second fixed support (12), the third fixed support (13) and the fourth fixed support (14) are all identical L-shaped steels, and the first fixed support (11), the second fixed support (12), the third fixed support (13) and the fourth fixed support (14) are collectively arranged in a rectangular shape.

3. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 2, characterized in that, The L-shaped steel includes a long side and a short side. The long side of the first fixed support (11) is connected to the short side of the second fixed support (12). The long side of the second fixed support (12) is connected to the short side of the third fixed support (13). The long side of the third fixed support (13) is connected to the short side of the fourth fixed support (14). The long side of the fourth fixed support (14) is connected to the short side of the first fixed support (11).

4. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 3, characterized in that, The fixing bolt (20) includes a first support fixing bolt (21), a second support fixing bolt (22), a third support fixing bolt (23), and a fourth support fixing bolt (24). The first support fixing bolt (21) is located between the long side of the first fixed support (11) and the short side of the second fixed support (12). The second support fixing bolt (22) is located between the long side of the second fixed support (12) and the short side of the third fixed support (13). The third support fixing bolt (23) is located between the long side of the third fixed support (13) and the short side of the fourth fixed support (14). The fourth support fixing bolt (24) is located between the long side of the fourth fixed support (14) and the short side of the first fixed support (11).

5. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 4, characterized in that, The two bolt holes (50) are located on the outside of the fixed support (10) and are symmetrical about the geometric center of the fixed support (10).

6. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 5, characterized in that, The stress sensor holder (30) is welded to the outer surface of the long side of the first fixed support (11), and its welding position is located on the center line of the long side.

7. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 6, characterized in that, The bolt hole (50) includes a first hole (51) and a second hole (52). The first hole (51) is located on the long side of the fixed support (10) near the corner, and the second hole (52) is located on the short side of the fixed support (10) near the corner. The projections of the first hole (51) and the second hole (52) are symmetrical about the axis.

8. The stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 7, characterized in that, The reserved bolt hole (15) is located at the bottom of the fixed support (10), and the reserved bolt hole (15) is in line with the first hole (51) or the second hole (52).

9. A stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 8, characterized in that, The diameters of the reserved bolt hole (15), the first hole (51), and the second hole (52) are the same.

10. A stress sensor fixing device for health monitoring of rectangular steel truss beams according to claim 9, characterized in that, The stress sensor holder (30) is located at the end of the long side of the overall rectangle of the fixed support (10), near the center of the top of the rectangle.

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