Surface strain gauge mounting device and mounting method for steel structure monitoring

Abstract

The invention provides a surface strain gauge installation device and method for steel structure monitoring, and the device comprises a first installation support, a second installation support, and a strain gauge mold, and the shape specification and the size specification of the strain gauge mold are the same as those of a strain gauge. The strain gauge mold is mounted on the first mounting support and the second mounting support, the first mounting support and the second mounting support are mounted on the surface of a to-be-monitored steel structure, and the first mounting support and the second mounting support are aligned and flush through the strain gauge mold; after the first mounting support and the second mounting support are mounted on the surface of the to-be-monitored steel structure, the strain gauge mold is dismounted, and the strain gauge is mounted at the same time. The support openings are formed in the first mounting support and the second mounting support, a strain gauge mold or a strain gauge can be mounted in the radial direction through the support openings, the mounting space is saved, and the device is suitable for some construction scenes with narrow sites.

Description

Technical Field

[0001] The invention relates to the technical field of surface strain gauge installation and fixing devices for engineering monitoring, and in particular to a surface strain gauge installation device and an installation method for steel structure monitoring. Background Art

[0002] When conducting long-term strain monitoring of steel or concrete structures, including surface strain measurement of concrete or steel structures such as bridges, tunnels, foundation pit supports, columns, and steel sheet piles, it is often necessary to use strain gauges to measure stress changes on the surface of the structure. Vibrating wire strain gauges are generally used in experiments. When the stress inside the structure under test changes, the strain gauge synchronously senses the deformation, and the deformation is transmitted to the vibrating wire and converted into changes in the stress of the vibrating wire, thereby changing the vibration frequency of the vibrating wire. The electromagnetic coil excites the vibrating wire and measures its vibration frequency. The frequency signal is transmitted to the reading device via a cable, and the strain amount inside the structure under test can be measured.

[0003] When monitoring the stress of a structure, the strain gauge needs to be installed on the surface of the object. However, there are many difficulties in the installation process of traditional strain gauges, as follows:

[0004] 1. When welding the strain gauge to the surface of the object to be measured, the high temperature generated by welding can easily damage the precision components inside the strain gauge, which can easily lead to a decrease in measurement accuracy or even damage to the equipment. At the same time, the welding slag generated during welding can easily adhere to the surface of the strain gauge, causing obstacles to the installation and removal of the strain gauge.

[0005] 2. When installing a traditional strain gauge, the strain gauge needs to be inserted axially into the mounting bracket, which is inconvenient to install in a narrow space, affecting its application scope and efficiency.

[0006] Therefore, it is necessary to design a surface strain gauge installation device and installation method for steel structure monitoring to solve the above-mentioned problems. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a surface strain gauge installation device and installation method for steel structure monitoring, which is used to solve the problem in the prior art that the strain gauge is damaged during the installation process when it is installed on the surface of the steel structure to be monitored.

[0008] To achieve the above-mentioned purpose and other related purposes, the present invention provides a surface strain gauge installation device for steel structure monitoring, comprising a first mounting support, a second mounting support, and a strain gauge mold, wherein the strain gauge mold and the strain gauge have the same shape and size specifications; the strain gauge mold is installed on the first mounting support and the second mounting support, the first mounting support and the second mounting support are installed on the surface of the steel structure to be monitored, and the first mounting support and the second mounting support are aligned and flush with each other by means of the strain gauge mold; after the first mounting support and the second mounting support are installed on the surface of the steel structure to be monitored, the strain gauge mold is removed and the strain gauge is installed at the same time.

[0009] Preferably, the strain gauge mold includes a first mold end, a second mold end, and a mold middle rod, the first mold end and the second mold end are respectively arranged at the two ends of the mold middle rod, and the first mold end, the second mold end, and the mold middle rod are an integrated part; the diameters of the first mold end and the second mold end are larger than the diameter of the mold middle rod; the strain gauge includes a first strain gauge force transmission end, a second strain gauge force transmission end, a strain gauge middle rod, and a sensor, the first strain gauge force transmission end and the second strain gauge force transmission end are respectively arranged at the two ends of the strain gauge middle rod; the first strain gauge force transmission end and the first mold end have the same shape and size specifications, the second strain gauge force transmission end and the second mold end have the same shape and size specifications, and the strain gauge middle rod and the mold middle rod have the same shape and size specifications; the sensor is arranged on the outer circumferential surface of the strain gauge middle rod; the sensor is connected to a cable.

[0010] Preferably, strain gauge mounting holes are provided on the first mounting support and the second mounting support. The strain gauge mounting hole on the first mounting support is used for placing the first mold end or the first strain gauge force transmission end, and the strain gauge mounting hole on the second mounting support is used for placing the second mold end or the second strain gauge force transmission end.

[0011] Preferably, the first mounting support and the second mounting support are further provided with support openings, the support openings are radially connected to the strain gauge mounting hole, and one end of the support opening away from the strain gauge mounting hole is connected to the outside world; the diameter of the strain gauge mounting hole is larger than the diameter of the first mold end and the second mold end; the size of the support opening is larger than the diameter of the mold middle rod and smaller than the diameter of the first mold end and the second mold end.

[0012] Preferably, the first mounting support and the second mounting support are both provided with a fastening assembly for fixing the strain gauge mold or the strain gauge.

[0013] Preferably, threaded holes are radially provided on the first mounting support and the second mounting support, and the threaded holes are connected to the strain gauge mounting holes; and top screws are provided in the threaded holes, and the top screws are used to fix the strain gauge mold or the strain gauge.

[0014] Preferably, the first mounting support and the second mounting support are welded to the surface of the steel structure to be monitored, and the strain gauge mold is made of a metal alloy.

[0015] To achieve the above purpose or other purposes, the present invention also discloses a method for installing a surface strain gauge for steel structure monitoring, using the above surface strain gauge installation device for steel structure monitoring, and the steps are as follows:

[0016] S1: Preparation before installation; check that the strain gauge mold, strain gauge, first mounting support, and second mounting support are free of damage and deformation;

[0017] S2: Installing the strain gauge mold; installing the strain gauge mold between the first mounting support and the second mounting support, and ensuring that the first mounting support and the second mounting support are aligned and flush through the strain gauge mold;

[0018] S3: Check the stability of the connection between the strain gauge mold and the first mounting support and the second mounting support to ensure that the strain gauge mold does not move on the first mounting support and the second mounting support;

[0019] S4: Fix the first mounting support and the second mounting support on the surface of the steel structure to be monitored;

[0020] S5: Remove the strain gauge mold, and then install the strain gauge between the first mounting support and the second mounting support.

[0021] As described above, the surface strain gauge installation device and installation method for steel structure monitoring of the present invention have the following beneficial effects:

[0022] 1. The installation convenience of the present invention is significantly improved. The present invention uses a unique structural design to connect the strain gauge mold or strain gauge with the first mounting support and the second mounting support by top screws, which does not require complicated operation procedures and installation processes that require high professional skills. At the same time, the first mounting support and the second mounting support in the present invention are provided with support openings, and the strain gauge mold or strain gauge can be radially installed through the support openings, which saves installation space and is suitable for some construction scenes with narrow sites.

[0023] 2. The installation stability of the present invention is greatly enhanced. The present invention is provided with a top screw to ensure that the strain gauge mold will not loosen or move during the welding process or the strain gauge during use, thereby ensuring accurate positioning and the accuracy of stress monitoring.

[0024] 3. The present invention facilitates the protection of the strain gauge. In the present invention, a strain gauge mold is used to replace the strain gauge for welding installation. After the first mounting support and the second mounting support are welded on the surface of the steel structure to be monitored, the strain gauge mold is removed and then the strain gauge is installed. This can effectively avoid the damage to the strain gauge caused by the high welding temperature when the first mounting support and the second mounting support are welded on the surface of the steel structure to be monitored, thereby ensuring the accuracy of the strain gauge reading.

[0025] 4. The present invention is more convenient for maintenance and replacement. After the installation is completed, if the strain gauge needs to be maintained and replaced, it is only necessary to move the strain gauge axially for a certain distance so that the end of the strain gauge extends to the outside of the first mounting support or the second mounting support. At this time, the middle rod of the strain gauge can be taken out from the support opening, and then the new strain gauge can be installed into the first mounting support and the second mounting support along the support opening. This design can avoid the situation where welding slag is attached to the component during welding and cannot be moved axially and disassembled, and also makes the subsequent maintenance and replacement process simple and quick, without the need for large-scale disassembly and reinstallation of the entire installation device, reducing maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a surface strain gauge installation device for steel structure monitoring according to the present invention;

[0027] Figure 2 A top view of a surface strain gauge installation device for steel structure monitoring according to the present invention;

[0028] Figure 3 It is a cross-sectional schematic diagram of a first mounting support of a surface strain gauge mounting device for steel structure monitoring according to the present invention;

[0029] Figure 4 It is a spatial schematic diagram of a strain gauge mold of a surface strain gauge installation device for steel structure monitoring according to the present invention;

[0030] Figure 5 The present invention is a spatial schematic diagram of a strain gauge in a surface strain gauge installation device for steel structure monitoring.

[0031] Description of reference numerals:

[0032] 1. Strain gauge mold; 101. Mold middle rod; 102. First mold end; 103. Second mold end; 2. First mounting support; 3. Second mounting support; 4. Support opening; 5. Top screw; 6. Strain gauge; 601. Strain gauge middle rod; 602. First strain gauge force transmission end; 603. Second strain gauge force transmission end; 604. Sensor; 605. Cable; 7. Threaded hole; 8. Strain gauge mounting hole. DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0035] The present invention provides a surface strain gauge installation device for steel structure monitoring. For the convenience of description, the length direction of the first mounting support 2 is defined as the front-to-back direction, the width direction of the first mounting support 2 is defined as the left-to-right direction, and the height direction of the first mounting support 2 is defined as the up-down direction. Figure 1 A spatial rectangular coordinate system is established in , in which the positive and negative directions of the X-axis are the front direction and the rear direction respectively, the positive and negative directions of the Y-axis are the left direction and the right direction respectively, and the positive and negative directions of the Z-axis are the upward direction and the downward direction respectively, that is, the extension direction of the Y-axis is the axial direction, and the extension directions of the X-axis and the Z-axis are both radial directions.

[0036] like Figure 1-Figure 5 As shown, the present invention provides a surface strain gauge installation device for steel structure monitoring, comprising a first mounting support 2, a second mounting support 3, and a strain gauge mold 1, the strain gauge mold 1 and the strain gauge 6 have the same shape and size specifications; the strain gauge mold 1 is installed on the first mounting support 2 and the second mounting support 3, the first mounting support 2 and the second mounting support 3 are installed on the surface of the steel structure to be monitored, and the first mounting support 2 and the second mounting support 3 are aligned and flush with the strain gauge mold 1; after the first mounting support 2 and the second mounting support 3 are installed on the surface of the steel structure to be monitored, the strain gauge mold 1 is removed and the strain gauge 6 is installed at the same time.

[0037] The surface strain gauge installation device for steel structure monitoring disclosed by the present invention is provided with a strain gauge mold 1, and the strain gauge mold 1 is used to replace the strain gauge 6; the strain gauge mold 1 is first installed on the first mounting support 2 and the second mounting support 3, and then the first mounting support 2 and the second mounting support 3 are installed on the surface of the steel structure to be monitored, so as to avoid the strain gauge 6 being damaged by welding heat when the first mounting support 2 and the second mounting support 3 are welded to the surface of the steel structure to be monitored; after the installation of the first mounting support 2 and the second mounting support 3 is completed, the strain gauge mold 1 is removed, and the strain gauge 6 is installed, and the stress of the steel structure to be monitored is monitored through the strain gauge 6.

[0038] In this embodiment, the structures of the first mounting support 2 and the second mounting support 3 are the same. The steel structure to be monitored is not drawn in the figure, but the welds between the bottom ends of the first mounting support 2 and the second mounting support 3 and the steel structure to be monitored are drawn.

[0039] Preferably, Figure 1-Figure 5 As shown, the strain gauge mold 1 includes a first mold end 102, a second mold end 103, and a mold middle rod 101. The first mold end 102 and the second mold end 103 are respectively arranged at both ends of the mold middle rod 101, and the first mold end 102, the second mold end 103, and the mold middle rod 101 are integrated; the diameters of the first mold end 102 and the second mold end 103 are larger than the diameter of the mold middle rod 101; the strain gauge 6 includes a first strain gauge force transmission end 602, a second strain gauge force transmission end 603, a strain gauge middle rod 601, and and sensor 604, the first strain gauge force transmission end 602 and the second strain gauge force transmission end 603 are respectively arranged at the two ends of the strain gauge middle rod 601; the first strain gauge force transmission end 602 and the first mold end 102 have the same shape and size specifications, the second strain gauge force transmission end 603 and the second mold end 103 have the same shape and size specifications, the strain gauge middle rod 601 and the mold middle rod 101 have the same shape and size specifications; the sensor 604 is arranged on the outer circumference of the strain gauge middle rod 601; the sensor 604 is connected to a cable 605. In this embodiment, the strain gauge 6 and the strain gauge mold 1 are both cylindrical.

[0040] Preferably, Figure 3 As shown, a strain gauge mounting hole 8 is provided on the first mounting support 2 and the second mounting support 3. The strain gauge mounting hole 8 on the first mounting support 2 is used for placing the first mold end 102 or the first strain gauge force transmission end 602, and the strain gauge mounting hole 8 on the second mounting support 3 is used for placing the second mold end 103 or the second strain gauge force transmission end 603.

[0041] Further, such as Figure 1-Figure 3As shown, a support opening 4 is also provided on the first mounting support 2 and the second mounting support 3. The support opening 4 is radially connected to the strain gauge mounting hole 8, and one end of the support opening 4 away from the strain gauge mounting hole 8 is connected to the outside; the diameter of the strain gauge mounting hole 8 is larger than the diameter of the first mold end 102 and the second mold end 103; the size of the support opening 4 is larger than the diameter of the mold middle rod 101 and smaller than the diameter of the first mold end 102 and the second mold end 103.

[0042] In this embodiment, if Figure 3 As shown, the support opening 4 is opened along the diameter in the vertical direction, that is, the support opening 4 is opened along the up-down direction, and the support opening 4 passes through the top of the first mounting support 2 and the second mounting support 3, and then the bottom of the support opening 4 is connected to the strain gauge mounting hole 8. Therefore, the vertical cross-section of the first mounting support 2 and the second mounting support 3 is a U-shaped cross-section with a circular center and a rectangular opening at the top, and the diameter of the circular cross-section is slightly larger than the diameter of the first mold end 102 and the second mold end 103.

[0043] Preferably, in this embodiment, both the first mounting support 2 and the second mounting support 3 are provided with fastening components for fixing the strain gauge mold 1 or the strain gauge 6 .

[0044] In this embodiment, the fastening assembly can adopt a variety of fastening methods, for example, by providing buckles on the two side walls of the support opening 4, and using the clamping connection between the buckles to fix the strain gauge mold 1 or the strain gauge 6; for another example, by hingedly arranging clamps on the two side walls of the support opening 4, and arranging damping materials such as rubber on the inner wall of the clamp, the strain gauge mold 1 or the strain gauge 6 can be fixed; for another example, bolts are used to penetrate the two side walls of the support opening 4, and then a number of rubber pads are sleeved on the bolts, and the friction between the rubber pads and the strain gauge mold 1 or the strain gauge 6 is relied on to fix the strain gauge mold 1 or the strain gauge 6, and so on.

[0045] Preferably, Figure 1-Figure 3As shown, the present application discloses a method for fixing a strain gauge mold or a strain gauge, wherein a threaded hole 7 is radially opened on the first mounting support 2 and the second mounting support 3, and the threaded hole 7 is connected to the strain gauge mounting hole 8; a top screw 5 is arranged in the threaded hole 7, and the top screw 5 is used to fix the strain gauge mold 1 or the strain gauge 6. After the first mold end 102 (the first strain gauge force transmission end 602) and the second mold end 103 (the second strain gauge force transmission end 603) are respectively placed in the strain gauge mounting holes 8 of the first mounting support 2 and the second mounting support 3, the top screw 5 is screwed into the threaded hole 7, and the bottom end of the top screw 5 abuts against the outer peripheral surface of the first mold end 102 (the first strain gauge force transmission end 602) and the second mold end 103 (the second strain gauge force transmission end 603), thereby realizing the fastening of the strain gauge mold 1 or the strain gauge 6. The top ends of the two side surfaces of the support opening 4 of the first mounting support 2 and the second mounting support 3 are inclined surfaces.

[0046] Preferably, the first mounting bracket 2 and the second mounting bracket 3 are welded on the surface of the steel structure to be monitored, and the strain gauge mold 1 is made of a metal alloy. In this embodiment, the metal alloy is made of stainless steel, aluminum alloy, and various high temperature resistant materials.

[0047] To achieve the above purpose or other purposes, the present invention also discloses a method for installing a surface strain gauge for steel structure monitoring, using the above surface strain gauge installation device for steel structure monitoring, and the steps are as follows:

[0048] A1: Preparation before installation; Check whether the strain gauge mold 1 and strain gauge 6 are damaged or deformed. Check whether the first mounting support 2, the second mounting support 3, and the top screw 5 are defective, such as missing or rusty, which may affect the installation. Prepare the welding machine used for welding the first mounting support 2 and the second mounting support 3, and the wrench and other tools required for installing the top screw 5.

[0049] A2: Install the strain gauge mold 1; first, align the mold middle rod 101 of the strain gauge mold 1 with the support opening 4 in the vertical direction, and then move the strain gauge mold 1 downward so that the mold middle rod 101 of the strain gauge mold 1 passes through the support opening 4, and at the same time, the first mold end 102 and the second mold end 103 of the strain gauge mold 1 are on the same horizontal axis as the strain gauge mounting holes 8 of the first mounting support 2 and the second mounting support 3. Subsequently, push the strain gauge mold 1 in the axial direction so that the first mold end 102 of the strain gauge mold 1 is in the strain gauge mounting hole 8 of the first mounting support 2, and the end face of the first mold end 102 is aligned with the end face of the first mounting support 2; at the same time, the second mold end 103 of the strain gauge mold 1 is in the strain gauge mounting hole 8 of the second mounting support 3, and the end face of the second mold end 103 is aligned with the end face of the second mounting support 3. Subsequently, the strain gauge mold 1 is fixed to the first mounting support 2 and the second mounting support 3 using a fastening assembly (such as a clip, a clamp or a bolt in combination with a rubber pad) or a top screw 5, so that the first mounting support 2 and the second mounting support 3 are aligned parallel to each other.

[0050] A3: Gently shake the strain gauge mold 1 to see if the strain gauge mold 1 is loose on the first mounting support 2 and the second mounting support 3 (including axial movement and circumferential rotation). Also observe whether the fastening components or the top screw 5 are loose, and make sure that the strain gauge mold 1 is stable on the first mounting support 2 and the second mounting support 3.

[0051] A4: Weld the first mounting bracket 2 and the second mounting bracket 3 to the surface of the steel structure to be monitored; determine the location of the monitoring point, then polish the surface paint and rust at the location to make it smooth, and then use a welding machine to weld the bottom end of the first mounting bracket 2 and the bottom end of the second mounting bracket 3 to the surface of the steel structure to be monitored. Ensure the welding quality during the welding process to ensure that the first mounting bracket 2 and the second mounting bracket 3 are firmly fixed on the surface of the steel structure to be monitored.

[0052] A5: Remove the strain gauge mold 1; after the first mounting support 2 and the second mounting support 3 have completely cooled, remove the strain gauge mold 1. For the method of fixing with the top screw 5, first completely unscrew the top screw 5, then axially move the strain gauge mold 1 so that the mold middle rod 101 is located below the support opening 4, and then remove the strain gauge mold 1 from the support opening 4. For other fastening methods, it is also necessary to gradually release the fixation according to the corresponding steps to ensure that the strain gauge mold 1 is removed intact.

[0053] A6: Install the strain gauge 6; the installation of the strain gauge 6 is the same as the installation of the strain gauge mold 1 in step A2, so that the first strain gauge force transmission end 602 is located in the strain gauge mounting hole 8 in the first mounting support 2, and the second strain gauge force transmission end 603 is located in the strain gauge mounting hole 8 of the second mounting support 3, which will not be repeated here.

[0054] A7: Connect the cable 605 to the external device, and the strain gauge 6 works to monitor the stress of the steel structure to be monitored.

[0055] Preferably, the purpose of setting step A2 is to install the strain gauge mold 1 on the first mounting support 2 and the second mounting support 3 instead of the strain gauge 6, and then install the first mounting support 2 and the second mounting support 3 on the surface of the steel structure to be monitored at a set distance and position, thereby meeting the installation requirements of the strain gauge 6 and avoiding the distance and position errors caused by welding the first mounting support 2 and the second mounting support 3 separately.

[0056] The present invention relates to a method for installing a surface strain gauge for steel structure monitoring, and more particularly to a surface strain gauge installation device and installation method that can effectively resist the adverse effects of excessively high welding temperature on the strain gauge 6 during installation, significantly improves installation convenience, greatly enhances installation stability, and uses a strain gauge mold 1 to replace the strain gauge 6 to prevent the strain gauge 6 from being damaged by high welding temperature, thereby effectively protecting the strain gauge 6;

[0057] The strain gauge mounting hole 8 in the present invention is connected to the support opening 4, so there is no need to insert the strain gauge 6 axially into the first mounting support 2 and the second mounting support 3. The strain gauge 6 can be installed in the up and down directions, which is suitable for installing the strain gauge 6 in a narrow range. It greatly improves the convenience and flexibility of installation, and also avoids the problem of welding slag being adsorbed on the outer surface of the strain gauge mold 1 and unable to be removed axially during welding.

[0058] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A surface strain gauge installation device for steel structure monitoring, characterized in that: The invention comprises a first mounting support (2), a second mounting support (3), and a strain gauge mold (1); the shape and size specifications of the strain gauge mold (1) and the strain gauge (6) are the same; the strain gauge mold (1) is mounted on the first mounting support (2) and the second mounting support (3); the first mounting support (2) and the second mounting support (3) are mounted on the surface of the steel structure to be monitored, and the first mounting support (2) and the second mounting support (3) are aligned and flush with each other by means of the strain gauge mold (1); after the first mounting support (2) and the second mounting support (3) are mounted on the surface of the steel structure to be monitored, the strain gauge mold (1) is removed and the strain gauge (6) is installed at the same time.

2. The surface strain gauge installation device for steel structure monitoring according to claim 1, characterized in that: The strain gauge mold (1) comprises a first mold end head (102), a second mold end head (103), and a mold middle rod (101); the first mold end head (102) and the second mold end head (103) are respectively arranged at two ends of the mold middle rod (101), and the first mold end head (102), the second mold end head (103), and the mold middle rod (101) are an integral part; the diameters of the first mold end head (102) and the second mold end head (103) are greater than the diameter of the mold middle rod (101); The strain gauge (6) comprises a first strain gauge force transmission end (602), a second strain gauge force transmission end (603), a strain gauge intermediate rod (601), and a sensor (604); the first strain gauge force transmission end (602) and the second strain gauge force transmission end (603) are respectively arranged at two ends of the strain gauge intermediate rod (601); the first strain gauge force transmission end (602) and the first mold end (102) have the same shape and size specifications, the second strain gauge force transmission end (603) and the second mold end (103) have the same shape and size specifications, and the strain gauge intermediate rod (601) and the mold intermediate rod (101) have the same shape and size specifications; the sensor (604) is arranged on the outer peripheral surface of the strain gauge intermediate rod (601); and the sensor (604) is connected to a cable (605).

3. The surface strain gauge installation device for steel structure monitoring according to claim 2, characterized in that: The first mounting support (2) and the second mounting support (3) are provided with strain gauge mounting holes (8); the strain gauge mounting hole (8) on the first mounting support (2) is used for placing the first mold end (102) or the first strain gauge force transmission end (602); and the strain gauge mounting hole (8) on the second mounting support (3) is used for placing the second mold end (103) or the second strain gauge force transmission end (603).

4. The surface strain gauge installation device for steel structure monitoring according to claim 3 is characterized in that: The first mounting support (2) and the second mounting support (3) are also provided with support openings (4), the support openings (4) are radially connected to the strain gauge mounting hole (8), and one end of the support opening (4) away from the strain gauge mounting hole (8) is connected to the outside; The diameter of the strain gauge mounting hole (8) is larger than the diameters of the first die end (102) and the second die end (103); the size of the support opening (4) is larger than the diameter of the die middle rod (101) and smaller than the diameters of the first die end (102) and the second die end (103).

5. The surface strain gauge installation device for steel structure monitoring according to claim 4, characterized in that: The first mounting support (2) and the second mounting support (3) are both provided with a fastening assembly for fixing the strain gauge mould (1) or the strain gauge (6).

6. The surface strain gauge installation device for steel structure monitoring according to claim 4, characterized in that: The first mounting support (2) and the second mounting support (3) are provided with threaded holes (7) in a radial direction, the threaded holes (7) being connected to the strain gauge mounting holes (8); the threaded holes (7) are provided with top screws (5), and the top screws (5) are used to fix the strain gauge mold (1) or the strain gauge (6).

7. The surface strain gauge installation device for steel structure monitoring according to claim 1, characterized in that: The first mounting support (2) and the second mounting support (3) are welded to the surface of the steel structure to be monitored, and the strain gauge mould (1) is made of a metal alloy material.

8. A method for installing a surface strain gauge for steel structure monitoring, using the surface strain gauge installation device for steel structure monitoring according to any one of claims 1 to 7, characterized in that: Here are the steps: S1: Preparation before installation; check the strain gauge mold (1), the strain gauge (6), the first mounting support (2), and the second mounting support (3) to ensure that there is no damage or deformation; S2: Installing the strain gauge mold (1); installing the strain gauge mold (1) between the first mounting support (2) and the second mounting support (3), and ensuring that the first mounting support (2) and the second mounting support (3) are aligned and flush through the strain gauge mold (1); S3: Check the stability of the connection between the strain gauge mold (1) and the first mounting support (2) and the second mounting support (3), and ensure that the strain gauge mold (1) will not move on the first mounting support (2) and the second mounting support (3); S4: fixing the first mounting support (2) and the second mounting support (3) on the surface of the steel structure to be monitored; S5: remove the strain gauge mold (1), and then install the strain gauge (6) between the first mounting support (2) and the second mounting support (3).

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