A device and installation method for bridge protection of steel plate surface strain test

Abstract

The present invention provides a device and installation method for protecting a strain test bridge on a steel plate surface, wherein the device comprises two half frames, each half frame having a protrusion at one end and a groove at the other end, and the two half frames are connected to form a frame assembly by plugging the protrusion of any half frame with the groove of the other half frame, and the frame assembly is used to be installed on the surface of the steel plate to be tested. After the frame assembly is installed on the surface of the steel plate to be tested, the two half frames enclose an installation space on the surface of the steel plate to be tested for installing a strain test bridge, the installation space is filled with a first sealing layer and a second sealing layer coated on the outside of the first sealing layer, and a first wire groove connecting the installation space and the outside is opened on one of the two half frames, and the first wire groove is filled with a second sealing layer. The present invention aims to solve the shortcomings of the existing method of installing a strain test bridge on the surface of a steel plate.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation engineering testing, and in particular relates to a device and an installation method for bridge protection used for steel plate surface strain testing. Background Art

[0002] Steel pipe piles and steel sheet piles are commonly used pile foundation forms in engineering projects. They are generally driven into the soil layer by impact, vibration or static pressure. Understanding the law of soil resistance around piles under the dynamic load of pile driving or the load of superstructure is the key to analyzing pile bearing capacity, performing pile foundation design calculations, and predicting the feasibility of pile sinking. The law of soil resistance is very complex. In actual engineering, strain sensors are generally installed at multiple points along the pile body to obtain the strain distribution data of the pile body under the pile loading condition, so as to indirectly calculate the soil resistance of the pile section between adjacent strain sensors. For driven piles such as steel pipe piles and steel sheet piles, the strain sensors installed on the surface of the steel plate must not only withstand the pile body stress during the pile driving process, but also withstand the water pressure and the impact force of the soil layer. Therefore, protective measures must be taken for the strain sensors to isolate the water pressure and the impact force of the soil layer and withstand the dynamic stress of pile driving. At present, conventional vibrating-wire strain gauges and resistive strain gauges can withstand a certain amount of water pressure through the packaging of the sensor itself, but they still need external protection to resist the impact force of the soil layer. Since the packaged strain gauges are large in size, the mounting support and external protection dimensions are also correspondingly large, which causes a certain degree of interference to the stress of the stress measuring point, and the overall ability to withstand the dynamic stress of pile driving is poor. In actual engineering applications, the survival rate is often low. At the same time, strain gauges that can meet the requirements of the dynamic response test of pile driving are expensive, and the one-time investment cost of multi-point testing is high.

[0003] The surface-mounted strain test bridge is a common method for dynamic and static strain testing on the free surface of steel plates. The surface-mounted strain test bridge is small in size, the bridge type can be freely selected, and the cost is relatively low, but the encapsulated surface-mounted strain test bridge cannot withstand water pressure and soil impact force. When applied to the strain test of driven piles, it still needs to adopt appropriate protective decoration and reasonable protection methods. The common method of installing a strain test bridge on the surface of a steel plate is to mill a groove at the strain measurement point on the surface of the steel plate, and then install the strain test bridge in the groove and potting it with potting glue. The milling method has a large disturbance on the stress state of the strain measurement point, especially for general steel sheet piles, steel pipe piles and other working conditions with a small pile wall thickness. In addition, machine tools cannot be used in the on-site environment, and milling is difficult, time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide a device and an installation method for protecting a strain test bridge on the surface of a steel plate, aiming to solve the shortcomings of the existing method of installing a strain test bridge on the surface of a steel plate.

[0005] The present invention is achieved through the following technical solutions:

[0006] A device for protecting a steel plate surface strain test bridge comprises two half frames, each half frame is provided with a protrusion at one end and a groove at the other end, the two half frames are connected into a frame assembly by plugging the protrusion of any half frame into the groove of the other half frame, the frame assembly is used to be installed on the surface of the steel plate to be tested, after the frame assembly is installed on the surface of the steel plate to be tested, the two half frames enclose an installation space for installing a strain test bridge on the surface of the steel plate to be tested, the installation space is filled with a first sealing layer and a second sealing layer covering the outside of the first sealing layer, one of the two half frames is provided with a first wire groove connecting the installation space with the outside, and the first wire groove is filled with the second sealing layer.

[0007] Furthermore, a first cutout is provided on the inner wall of any half frame close to the steel plate to be tested.

[0008] Furthermore, any half of the frame is welded to the surface of the steel plate to be tested.

[0009] Furthermore, a second cutout is provided on a local outer wall of any half frame close to a side of the steel plate to be tested, and the space between the second cutout and the steel plate to be tested is filled with welding material.

[0010] Furthermore, a rubber strip is provided at the bottom of the groove.

[0011] Furthermore, the length of the rubber strip is equal to the length of the groove, and the width and height of the rubber strip are equal to the width of the groove.

[0012] Furthermore, flexible sealing layers for sealing the gaps between the grooves and the corresponding protrusions are respectively provided between the two ends of the two half frames.

[0013] Furthermore, the second sealing layer is an epoxy potting adhesive layer, and / or the first sealing layer and the flexible sealing layer are silicone rubber layers.

[0014] The present invention also provides a method for installing the device for steel plate surface strain testing bridge protection as described in any one of the above, comprising the following steps:

[0015] The surface of the steel plate to be tested is processed with the preset strain measuring point as the center to expose the flat surface of the steel plate to be tested, and the processed area is not less than the area of ​​the frame assembly;

[0016] Install the frame assembly on the surface of the steel plate to be tested so that its center coincides with the preset strain measurement point, and the length direction of any half frame is perpendicular to the strain direction to be tested. The two half frames form an installation space on the surface of the steel plate to be tested, and clear the foreign matter in the installation space;

[0017] Paste the strain test bridge at the preset strain measurement point, and pass the cable of the strain test bridge through the first wire duct to the outside of the installation space;

[0018] The strain test bridge is covered with a first sealing layer, the remaining space in the installation space except the first sealing layer is filled with a second sealing layer, and the second sealing layer is filled in the first wire groove.

[0019] Furthermore, a protective angle steel is provided on the surface of the steel plate to be tested, and a conical seal is provided at the lower end of the protective angle steel. Before the step of installing the frame assembly on the surface of the steel plate to be tested, the installation method further includes:

[0020] Place the frame assembly on the surface of the steel plate to be tested so that its center coincides with the preset strain measurement point, and the length direction of any half of the frame is perpendicular to the strain direction to be tested, and mark the position corresponding to the first wire groove on the surface of the steel plate to be tested;

[0021] The frame assembly is removed, and the surface of the steel plate to be measured is cut according to the mark to form a second wire groove, and the end of the second wire groove away from the preset strain measurement point is cut to the position of the protection angle steel;

[0022] After the step of passing the cable of the strain gauge test bridge out of the first cable duct to the outside of the installation space, the installation method further includes:

[0023] Cut the end of the second wire duct away from the strain measurement point to the position of the protective angle steel;

[0024] Lead the cable of the strain test bridge into the protective angle steel along the second cable duct, and lead it out to the top of the pile along the protective angle steel;

[0025] The second sealing layer is filled in the second wire duct, and the foaming agent is filled in the protective angle steel.

[0026] Compared with the prior art, the present invention has the following beneficial effects: it is suitable for engineering sites and is easy to install; the strain test bridge is arranged in the first sealing layer; an installation frame assembly is used in combination with the first sealing layer and the second sealing layer to form a protective shell with relatively large rigidity, so that the strain test bridge can resist soil impact force, water pressure and withstand dynamic stress of pile driving; in the direction in which strain testing is required, the two half frames are combined into a frame assembly in a concave-convex nesting manner at both ends; the relative displacement of the two half frames in the strain test direction and in a direction perpendicular to the strain test direction is not restricted, which can greatly reduce the interference of the frame assembly on the strain state of the strain measuring point in the middle thereof, effectively solving the problem that the existing strain test bridges underwater and below the mud surface cannot be effectively protected during the sinking of steel pipe piles and steel sheet piles, and improving the survival rate of dynamic and static strain test measuring points of the pile bodies of steel pipe piles and steel sheet piles and the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic top view of the internal arrangement of a strain test bridge of a device for protecting a steel plate surface strain test bridge according to the present invention;

[0028] Figure 2 It is a right side cross-sectional view of the device for bridge protection of steel plate surface strain testing according to the present invention;

[0029] Figure 3 It is a front cross-sectional view of a device for protecting a bridge circuit for testing a surface strain of a steel plate according to the present invention;

[0030] Figure 4 It is a structural schematic diagram of a frame assembly in a device for bridge protection of steel plate surface strain testing according to the present invention;

[0031] Figure 5 for Figure 4 A1-A1 section view;

[0032] Figure 6 for Figure 4 A2-A2 section view;

[0033] Figure 7 for Figure 4 A3-A3 section view;

[0034] Figure 8 for Figure 4 A4-A4 cross-sectional view;

[0035] Fig. 9 for Figure 4 B1-B1 section view;

[0036] Fig.10 for Figure 4 B2-B2 cross-sectional view;

[0037] Fig.11 for Figure 4 B3-B3 cross-sectional view;

[0038] Fig.12 for Figure 4 B4-B4 cross-sectional view;

[0039] Fig.13 for Figure 4 B5-B5 cross-sectional view;

[0040] Fig.14 for Figure 4 B6-B6 cross-sectional view;

[0041] Fig.15 It is a schematic diagram of the installation method of the device for bridge protection of steel plate surface strain testing of the present invention.

[0042] In the figure, 1-half frame, 11-protrusion, 12-groove, 13-first wire trough, 14-first cutout, 15-second cutout, 2-first sealing layer, 3-second sealing layer, 4-welding material, 5-rubber strip, 6-steel plate to be tested, 7-strain test bridge, 71-cable, 8-protective angle steel. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0048] See also Figures 1 to 3 , Figure 1 This is a top view schematic diagram of the internal arrangement of the strain test bridge of the device for steel plate surface strain test bridge protection of the present invention, without showing the first sealing layer, the second sealing layer and the flexible sealing layer. Figure 2 It is a right side cross-sectional view of the device for bridge protection of steel plate surface strain testing according to the present invention, Figure 3 The front cross-sectional view of the device for protecting the steel plate surface strain test bridge of the present invention. A device for protecting the steel plate surface strain test bridge comprises a frame assembly formed by connecting two half frames 1 and a first sealing layer 2 and a second sealing layer 3 arranged in the frame assembly, the frame assembly is arranged around the outside of the strain test bridge 7, the first sealing layer 2 is used to cover the strain test bridge 7, and the second sealing layer 3 is used to cover the first sealing layer 2. The frame assembly is installed in combination with the first sealing layer 2 and the second sealing layer 3 to form a protective shell with greater rigidity, so that the strain test bridge 7 can resist the impact force of the soil layer, water pressure and withstand the dynamic stress of pile driving.

[0049] Please refer to Figures 4 to 14 , Figure 4 This is a schematic diagram of the structure of the frame assembly in the device for bridge protection of steel plate surface strain testing of the present invention, without showing the flexible sealing layer. Figure 5 for Figure 4 A1-A1 section view, Figure 6 for Figure 4 A2-A2 section view, Figure 7 for Figure 4 A3-A3 cross-sectional view, Figure 8 for Figure 4 A4-A4 section drawing, Fig. 9 for Figure 4 B1-B1 section view, Fig.10 for Figure 4 B2-B2 cross-sectional view, Fig.11 for Figure 4 B3-B3 cross-sectional view, Fig.12 for Figure 4 B4-B4 cross-sectional view, Fig.13 for Figure 4 B5-B5 cross-sectional view, Fig.14 for Figure 4B6-B6 cross-sectional view. Specifically, a protrusion 11 is provided at one end of each half frame 1, and a groove 12 is provided at the other end. The protrusion 11 of any half frame 1 is plugged into the groove 12 of the other half frame 1, so that the two half frames 1 are connected to form a frame assembly. The frame assembly is used to be installed on the surface of the steel plate 6 to be tested. After the frame assembly is installed on the surface of the steel plate 6 to be tested, the two half frames 1 form an installation space for installing the strain test bridge 7 on the surface of the steel plate 6 to be tested. Both half frames 1 are U-shaped. The two half frames 1 are plugged into each other through the protrusion 11 and the corresponding groove 12 to form a rectangular frame assembly. Since the two half frames 1 are combined into a frame assembly in a concave-convex nesting manner at both ends, the two half frames 1 are movably connected. After being installed on the surface of the steel plate 6 to be tested, the relative displacement of the two half frames 1 in the strain test direction and the direction perpendicular to the strain test direction is not restricted, which can greatly reduce the interference of the frame assembly on the strain state of the middle strain measuring point. Specifically, in one embodiment, any half frame 1 is welded to the surface of the steel plate 6 to be tested. Specifically, a second cutout 15 is provided on the local outer wall of any half frame 1 close to the side of the steel plate 6 to be tested, and the second cutout 15 and the steel plate 6 to be tested are filled with welding material 4. The second cutout 15 is arranged along the outer wall of the half frame 1, and is U-shaped. The length of the U-shaped side walls of the second cutout 15 is less than the length of the U-shaped side walls of the half frame 1. The second cutout 15 is not welded to the steel plate 6 to be tested at the position corresponding to the protrusion 11 and the groove 12, so as to reduce the interference with the strain state of the strain measuring point. The inclined surface of the second cutout 15 is inclined inward from the side away from the steel plate 6 to be tested to the side close to the steel plate 6 to be tested. The weld formed by the welding material 4 is used to realize the welding connection between any half frame 1 and the steel plate 6 to be tested. In order to avoid direct contact between the two half frames 1 under force during the pile sinking process and damage to the half frame 1, in one embodiment, a rubber strip 5 is provided at the bottom of the groove 12. Preferably, the length of the rubber strip 5 is equal to the length of the groove 12, and its width and height are equal to the width of the groove 12. When the two half frames 1 are plugged in, the protrusions 11 are in contact with the rubber strips 5. The setting of the rubber strips 5 leaves a movable space between the two half frames 1, ensuring that the two half frames 1 are in a movable connection state, and the rubber strips 5 play a buffering role to avoid direct contact between the two half frames 1. Preferably, a flexible sealing layer for sealing the gap between the groove 12 and the corresponding protrusion 11 is provided between the two ends of the two half frames 1, and the gap between the groove 12 and the corresponding protrusion 11 is filled by the flexible sealing layer to ensure the lateral sealing of the frame assembly after it is installed on the surface of the steel plate 6 to be tested.

[0050] Specifically, the installation space is filled with a first sealing layer 2 and a second sealing layer 3 coated on the outside of the first sealing layer 2. A first wire groove 13 connecting the installation space and the outside is opened on one of the two half frames 1, and the first wire groove 13 is filled with the second sealing layer 3. After the strain test bridge 7 is installed on the surface of the steel plate 6 to be tested, the first sealing layer 2 is used to coat the outside of the strain test bridge 7, and the second sealing layer 3 is used to coat the outside of the first sealing layer 2 to form a protective layer for the strain test bridge 7. In one embodiment, a first cutout 14 is provided on the inner wall of any half frame 1 close to the steel plate 6 to be tested. The inclined surface of the first cutout 14 is inclined outward from the side away from the steel plate 6 to the side close to the steel plate 6 to be tested. This design makes the second sealing layer 3 partly between the half frame 1 and the surface of the steel plate 6 to be tested, ensuring that the second sealing layer 3 can be stably filled in the installation space and better play a role in sealing and waterproofing. Preferably, the flexible sealing layer and the first sealing layer 2 are silicone rubber layers. The second sealing layer 3 is an epoxy potting glue layer.

[0051] Please refer to Fig.15 , Fig.15 The present invention also provides a method for installing a bridge protection device for testing the surface strain of a steel plate as described above, comprising the following steps:

[0052] S1. The surface of the steel plate 6 to be tested is treated with the preset strain measuring point as the center to expose the flat surface of the steel plate 6 to be tested, and the treated area is not less than the area of ​​the frame assembly;

[0053] S2. Install the frame assembly on the surface of the steel plate 6 to be tested, so that its center coincides with the preset strain measurement point, and the length direction of any half frame 1 is perpendicular to the strain direction to be tested. The two half frames 1 form an installation space on the surface of the steel plate 6 to be tested, and clean the foreign matter in the installation space;

[0054] S3, attaching the strain test bridge 7 to the preset strain measurement point, and passing the cable 71 of the strain test bridge 7 through the first wire duct 13 to the outside of the installation space;

[0055] S4, covering the strain test bridge 7 with the first sealing layer 2, filling the remaining space in the installation space except the first sealing layer 2 with the second sealing layer 3, and filling the first wire groove 13 with the second sealing layer 3.

[0056] In the above step S1, a plurality of preset strain measuring points are preset along the pile body on the surface of the steel plate 6 to be tested of the steel pipe pile and the steel sheet pile. For each preset strain measuring point, the surface of the steel plate 6 to be tested is processed with the preset strain measuring point as the center, and the processing area is larger than the area of ​​the frame assembly, so that a flat and fresh steel plate surface is exposed within the area.

[0057] In the above step S2, the two half frames 1 are welded along the local outer wall cutouts of the two half frames 1, and the two half frames 1 are welded to the surface of the steel plate 6 to be tested. The height and width of the welding material 4 outside the second cutout 15 are basically consistent with the thickness of the frame assembly. The welding material 4 that is higher than the thickness of the frame assembly is polished to be flush with the side of the frame assembly away from the steel plate 6 to be tested. At this time, the center of the frame assembly composed of the two half frames 1 coincides with the strain measuring point, and the line connecting the center of the frame assembly and the strain measuring point is perpendicular to the surface of the steel plate 6 to be tested. The length direction of the two half frames 1 is the U-shaped bottom, and the U-shaped bottom of the two half frames 1 is perpendicular to the strain direction to be tested. If the strain in the length direction of the pile body is measured, the U-shaped bottom of the two half frames 1 is perpendicular to the length direction of the pile body. Then clean up the foreign matter in the frame assembly.

[0058] In the above step S3, strain gauges and terminals are pasted and welded on the preset strain measurement points in the installation space to form a strain test bridge 7. The structure of the strain test bridge 7 is a prior art and will not be described in detail here. The cable 71 of the strain test bridge 7 is passed through the first wire groove 13, and the cable 71 of the strain test bridge 7 is led out to the outside of the installation space, and then the first wire groove 13 is filled with epoxy potting glue to form the second sealing layer 3.

[0059] Furthermore, a protective angle steel 8 is provided on the surface of the steel plate 6 to be tested, and a conical seal is provided at the lower end of the protective angle steel 8. Before step S2, the installation method further includes:

[0060] S21, placing the frame assembly on the surface of the steel plate 6 to be tested, so that its center coincides with the preset strain measurement point, and the length direction of any half of the frame 1 is perpendicular to the tested strain direction, and marking the position corresponding to the first wire groove 13 on the surface of the steel plate 6 to be tested;

[0061] S22, remove the frame assembly, cut the surface of the steel plate 6 to be measured according to the mark to form a second wire groove, and cut the end of the second wire groove away from the preset strain measurement point to the position of the protective angle steel 8;

[0062] After step S3, the installation method further comprises:

[0063] S31, lead the cable 71 of the strain test bridge 7 into the protective angle steel 8 along the second cable duct, and lead it out to the pile top along the protective angle steel 8;

[0064] S32, filling the second sealing layer 3 in the second wire duct, and filling the foaming agent in the protective angle steel 8.

[0065] Specifically, the outer edge of the protective angle steel 8 is welded and fixed to the surface of the steel plate 6 to be tested at a certain distance, and the protective angle steel 8 near the strain measurement point is kept separated from the surface of the steel plate 6 to be tested. The conical seal is welded and fixed to the surface of the steel plate 6 to be tested.

[0066] In the above steps S21 to S22, when the frame assembly is placed on the surface of the steel plate 6 to be tested, the line connecting the center of the frame assembly and the strain measuring point is perpendicular to the surface of the steel plate 6 to be tested, and the U-shaped bottom of the two half frames 1 is perpendicular to the strain direction to be tested. Then, the position corresponding to the first wire groove 13 on the surface of the steel plate 6 to be tested is marked, and the second wire groove is cut at the marked position. The direction, width and depth of the cut second wire groove are consistent with the first wire groove 13. One end of the second wire groove is located at a position corresponding to the center of the first wire groove 13, and the other end is located within the coverage of the protective angle steel 8.

[0067] In the above steps S31 and S32, after the cable 71 of the strain test bridge 7 is led out of the installation space between the first wire trough 13 and the second wire trough, it continues to be introduced into the protective angle steel 8 along the second wire trough, and then led upward to the pile top along the protective angle steel 8. Then, the second wire trough is filled with epoxy potting glue to form a second sealing layer 3, and the protective angle steel 8 is filled with a foaming agent. The cable 71 of the strain measurement point bridge is protected by the second sealing layer 3 and the protective angle steel 8 to prevent the cable 71 of the strain test bridge 7 from breaking during the pile sinking process.

[0068] In the above step S4, the silicone rubber is applied to cover the strain test bridge 7 in the frame assembly, and the silicone rubber is hardened to form a first sealing layer 2, and then the remaining space in the installation space except the first sealing layer 2 is filled with epoxy potting glue until it is flush with the side of the frame assembly away from the surface of the steel plate 6 to be tested, forming a second sealing layer 3. The space between the strain test bridge 7 and the first wire slot 13 is also filled with epoxy potting glue to form a second sealing layer 3.

[0069] Compared with the prior art, the beneficial effects of the present invention are as follows: it is suitable for engineering sites and is easy to install. The strain test bridge 7 is arranged in the first sealing layer 2. An installation frame assembly is used to combine the first sealing layer 2 and the second sealing layer 3 to form a protective shell with greater rigidity, so that the strain test bridge 7 can resist the impact force of the soil layer, water pressure and withstand the dynamic stress of pile driving. In the direction in which the strain test is required, the two half frames 1 are combined into a frame assembly in a concave-convex nesting manner at both ends. The relative displacement of the two half frames 1 in the strain test direction and in the direction perpendicular to the strain test direction is not restricted, which can greatly reduce the interference of the frame assembly on the strain state of the middle strain measuring point, effectively solve the problem that the existing strain test bridge 7 underwater and below the mud surface cannot be effectively protected during the sinking of steel pipe piles and steel sheet piles, and improve the survival rate of the dynamic and static strain test points of the pile body of steel pipe piles and steel sheet piles and the accuracy of the test data.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for installing a bridge protection device for testing the surface strain of a steel plate, characterized in that: The device comprises two half frames, each of which is provided with a protrusion at one end and a groove at the other end, and the two half frames are connected into a frame assembly by plugging the protrusion of any half frame into the groove of the other half frame, and the frame assembly is used to be installed on the surface of the steel plate to be tested. After the frame assembly is installed on the surface of the steel plate to be tested, the two half frames enclose an installation space for installing a strain test bridge on the surface of the steel plate to be tested, and the installation space is filled with a first sealing layer and a second sealing layer covering the outside of the first sealing layer. A first wire groove connecting the installation space and the outside is opened on one of the two half frames, and the first wire groove is filled with a second sealing layer, and a rubber strip is provided at the bottom of the groove; The method comprises the following steps: The surface of the steel plate to be tested is processed with the preset strain measuring point as the center to expose the flat surface of the steel plate to be tested, and the processed area is not less than the area of ​​the frame assembly; The frame assembly is installed on the surface of the steel plate to be tested, so that its center coincides with the preset strain measurement point, and the length direction of any half frame is perpendicular to the strain direction to be tested, and the two half frames enclose an installation space on the surface of the steel plate to be tested, and foreign objects in the installation space are cleared; Paste a strain test bridge at a preset strain measurement point, and pass the cable of the strain test bridge through the first wire duct to the outside of the installation space; The strain test bridge is covered with a first sealing layer, the remaining space in the installation space except the first sealing layer is filled with a second sealing layer, and the second sealing layer is filled in the first wire groove.

2. The installation method according to claim 1, characterized in that: The surface of the steel plate to be tested is provided with a protective angle steel, and the lower end of the protective angle steel is provided with a conical seal. Before the step of installing the frame assembly on the surface of the steel plate to be tested, the installation method further includes: The frame assembly is placed on the surface of the steel plate to be tested, so that its center coincides with the preset strain measurement point, and the length direction of any half frame is perpendicular to the tested strain direction, and the position corresponding to the first wire groove is marked on the surface of the steel plate to be tested; The frame assembly is removed, and the surface of the steel plate to be measured is cut according to the mark to form a second wire groove, and the end of the second wire groove away from the preset strain measurement point is cut to the position of the protection angle steel; After the step of passing the cable of the strain gauge test bridge through the first cable duct to the outside of the installation space, the installation method further includes: Cut the end of the second wire duct away from the strain measurement point to the position of the protective angle steel; Leading the cable of the strain test bridge into the protective angle steel along the second cable duct, and leading it out to the top of the pile along the protective angle steel; A second sealing layer is filled in the second wire duct, and a foaming agent is filled in the protective angle steel.

3. The installation method according to claim 1, characterized in that: A first cutout is provided on the inner wall of any half frame close to the steel plate to be tested.

4. The installation method according to claim 1, characterized in that: Any of the half frames is welded to the surface of the steel plate to be tested.

5. The installation method according to claim 4, characterized in that: A second cutout is provided on a local outer wall of any of the half frames close to a side of the steel plate to be tested, and the space between the second cutout and the steel plate to be tested is filled with welding material.

6. The installation method according to claim 1, characterized in that: The length of the rubber strip is equal to the length of the groove, and the width and height of the rubber strip are equal to the width of the groove.

7. The installation method according to claim 1, characterized in that: A flexible sealing layer for sealing the gap between the groove and the corresponding protrusion is respectively provided between the two ends of the two half frames.

8. The installation method according to claim 7, characterized in that: The second sealing layer is an epoxy potting adhesive layer, and / or the first sealing layer and the flexible sealing layer are silicone rubber layers.

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