External prestressing reinforcing device and method for structure

Abstract

The invention relates to the field of building structure reinforcing, and provides a structure external prestressing reinforcing device and method. The structure external prestressing reinforcing device comprises a device body, a moving assembly, a shape memory alloy body, fixing equipment and heat radiation equipment, the moving assembly comprises a connecting arm, a guide rail and a propelling arm, the connecting arm is rotationally connected to the device body and the guide rail, and the propelling arm is connected to the guide rail; an angle is formed between the propelling direction of the propelling arm and the extending direction of the guide rail; the shape memory alloy body is detachably connected to the propelling arm; the fixing equipment is slidably connected to the guide rail and used for fixing the shape memory alloy body to a to-be-reinforced position; the heat radiation equipment is slidably connected to the guide rail and used for heating the shape memory alloy body. The shape memory alloy external prestressing reinforcement technology is adopted, active reinforcement is carried out, the performance of a reinforcement material is mobilized, the structural bearing capacity is enhanced, a temperature excitation mode is utilized, tensioning equipment and manual operation are not needed, the construction difficulty is reduced, and the labor cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of building structure reinforcement, and in particular to a device and method for reinforcing a structure externally prestressed. Background Art

[0002] With the new form of social development, the demand for large-scale incremental new construction projects has decreased, and it has been replaced by the requirements for the safety and high-quality operation and maintenance of existing buildings. my country has a large stock of existing buildings. With the increase in service life and the effects of disasters, many existing buildings are facing the need for reinforcement and repair. It is very important to propose intelligent, efficient and reliable reinforcement and repair equipment and methods for existing buildings. At the same time, the commonly used reinforcement forms of buildings can be divided into passive reinforcement and active reinforcement. Passive reinforcement mainly includes: bonded steel method, fiber cloth reinforcement method, outsourcing steel method, etc. This type of reinforcement technology uses high-performance materials to reinforce weak components such as tension and bending, but it cannot mobilize its own performance and only begins to produce reinforcement effects when the components are loaded. Active reinforcement technology mainly includes tensioning unbonded steel strands and prestressed steel as struts. This process method requires large-scale tensioning equipment to apply prestress, which is cumbersome to operate and has high time, manpower and economic costs. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a structural external prestressed reinforcement device to solve the defects of the existing reinforcement project that requires a large amount of manpower, a long reinforcement construction period, and many high-altitude operations.

[0004] The present application also proposes a method for external prestressing reinforcement of a structure.

[0005] The structural external prestressed reinforcement device proposed in the embodiment of the first aspect of the present application includes: Device body; A motion assembly, comprising a connecting arm, a guide rail and a propulsion arm, wherein the connecting arm is rotatably connected to the device body and the guide rail, the propulsion arm is connected to the guide rail, and a propulsion direction of the propulsion arm and an extension direction of the guide rail are arranged at an angle; A shape memory alloy body, detachably connected to the propulsion arm, the shape memory alloy body being suitable for approaching or moving away from the guide rail through the propulsion arm; A fixing device, slidably connected to the guide rail, for fixing the shape memory alloy body at a position to be reinforced; A heat radiation device is slidably connected to the guide rail and is used for heating the shape memory alloy body.

[0006] According to the structural external prestressed reinforcement device of the embodiment of the present application, active reinforcement is carried out by adopting shape memory alloy external prestressed reinforcement technology, mobilizing the performance of the reinforcement material itself, enhancing the bearing capacity of the structure, and utilizing temperature excitation. There is no need for tensioning equipment and manual operation, which reduces the difficulty of construction and saves labor costs.

[0007] According to one embodiment of the present application, the device body is provided with a negative pressure adsorption device and a moving device, the negative pressure adsorption device is used to provide adsorption force so that the device body is close to the cavity wall, and the moving device is arranged at the bottom of the device body.

[0008] According to one embodiment of the present application, the mobile device includes at least one of tires and tracks.

[0009] According to one embodiment of the present application, the device body is provided with a visual image device.

[0010] According to one embodiment of the present application, an infrared thermal imager is included, wherein the infrared thermal imager is connected to the device body, and the infrared thermal imager is used to detect the temperature of the heating area of ​​the shape memory alloy body.

[0011] According to one embodiment of the present application, the fixing device is one of an anchoring glue mechanical roller and a nail shooting device.

[0012] According to one embodiment of the present application, a rotating platform is included, the fixing device is connected to the rotating platform, and the fixing device is arranged outside the rotating axis of the rotating platform, and the fixing device is slidably connected to the guide rail through the rotating platform.

[0013] According to one embodiment of the present application, a grinding device is included, and the grinding device is arranged on the rotating platform, and the grinding device is arranged outside the rotating axis of the rotating platform.

[0014] According to an embodiment of the present application, the heat radiation device includes a heat radiation plate, a heat transfer cover and a heating wire, the heating wire is connected to the heat radiation plate, the heat transfer cover is connected to the radiation plate and is disposed on the heating wire.

[0015] The method for reinforcing a structure externally prestressed according to the second aspect of the present application is applied to the above-mentioned device for reinforcing a structure externally prestressed, and includes: Moving the shape memory alloy body to a position to be reinforced; Fixing the shape memory alloy body to a position to be reinforced; The heat radiation device is controlled to start, the heat radiation device is controlled to move, and the shape memory alloy body is stimulated to produce a temperature effect.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is one of the structural schematic diagrams of the structural extracorporeal prestressed reinforcement device provided in the embodiments of the present application.

[0019] Figure 2 This is the second structural schematic diagram of the structural extracorporeal prestressed reinforcement device provided in the embodiment of the present application.

[0020] Figure 3 It is one of the structural schematic diagrams of the heat radiation device provided in the embodiment of the present application.

[0021] Figure 4 This is the second structural schematic diagram of the heat radiation device provided in the embodiment of the present application.

[0022] Figure 5 It is a schematic flow chart of the method for external prestressing reinforcement of a structure provided in an embodiment of the present application.

[0023] Reference numerals: 1. Mobile device; 2. Visual image device; 3. Connecting arm; 4. Fixing device; 5. Grinding device; 6. Heat radiation device; 6a. Heating wire; 6b. Heat transfer cover; 6c. Radiation plate; 7. Guide rail; 8. Propelling arm; 9. Shape memory alloy body; 10. Infrared thermal imager; 11. Rotating platform; 12. Negative pressure adsorption device; 13. Negative pressure air chamber; DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0025] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, wherein the fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0027] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] Combine the following Figures 1 to 5 The present invention describes a structural external prestressed reinforcement device and a structural external prestressed reinforcement method.

[0030] According to the external prestressed reinforcement device of the structure proposed in this application, please refer to Figure 1 and Figure 2 , including: a device body, a moving component, a shape memory alloy body 9, a fixing device 4 and a heat radiation device 6, the moving component includes a connecting arm 3, a guide rail 7 and a propulsion arm 8, the connecting arm 3 is rotatably connected to the device body and the guide rail 7, the propulsion arm 8 is connected to the guide rail 7, and the propulsion direction of the propulsion arm 8 and the extension direction of the guide rail 7 are set at an angle; the shape memory alloy body 9 is detachably connected to the propulsion arm 8, and the shape memory alloy body 9 is suitable for approaching or moving away from the guide rail 7 through the propulsion arm 8; the fixing device 4 is slidably connected to the guide rail 7, and is used to fix the shape memory alloy body 9 at the position to be reinforced; the heat radiation device 6 is slidably connected to the guide rail 7, and is used to heat the shape memory alloy body 9.

[0031] According to the external prestressed reinforcement device of the structure in the embodiment of the present application, active reinforcement is carried out by adopting the external prestressed reinforcement technology of the shape memory alloy body 9, mobilizing the performance of the reinforcement material itself, enhancing the bearing capacity of the structure, and utilizing temperature excitation. There is no need for tensioning equipment and manual operation, which reduces the difficulty of construction and saves labor costs.

[0032] It is understandable that the shape memory alloy body 9 is a special alloy material with shape memory effect, which can recover to its original shape at a specific temperature. In this embodiment, it is used to apply prestress to the structure at the position to be reinforced to enhance its bearing capacity.

[0033] The shape memory alloy body 9 can be an iron-based shape memory alloy (Fe-SMA). Iron-based shape memory alloy is a type of intelligent metal material with shape memory effect. It has the advantages of shape recovery ability, strength, plasticity, and easy processing. The shape memory function of Fe-SMA is used to generate recovery stress as prestressed stress in building structural components. There is no need to use large-scale tensioning equipment and expensive anchors at the construction site. Only thermal excitation is required to trigger the recovery stress. In addition, this material has low production cost and has wide application potential in the field of building structure reinforcement.

[0034] The fixing device 4 is a device used to fix the shape memory alloy body 9 at the position to be reinforced. The fixing device 4 can adjust the position through the guide rail 7 to fix different positions of the shape memory alloy body 9. For example, the shape memory alloy body 9 is pre-punched with several mounting holes, and the fixing device 4 can change the position through the guide rail 7 to drive nails into different mounting holes.

[0035] The fixing device 4 can be a nail shooting machine or an anchoring glue mechanical roller. When the fixing device 4 is an anchoring glue mechanical roller, coupling glue can be brushed on the position to be reinforced to bond and fix the shape memory alloy body 9.

[0036] The heat radiation device 6 is a device capable of generating heat, and is used to heat the shape memory alloy body 9 .

[0037] The guide rail 7 can be a straight or curved track, which is used to guide the movement of components (including the fixing device 4, the heat radiation device 6, etc.) slidably connected to the guide rail 7 to ensure that they can move along a predetermined path. The fixing device 4 can fix different positions of the shape memory alloy body 9 by moving the guide rail 7, and the heat radiation device 6 can heat different positions of the shape memory alloy body 9 by moving the guide rail 7.

[0038] The propulsion arm 8 is connected to the component of the guide rail 7, and its propulsion direction is set at a certain angle to the extension direction of the guide rail 7, so as to push or pull the shape memory alloy body 9 close to or away from the guide rail 7, thereby adjusting the reinforcement position. In one embodiment, the propulsion direction of the propulsion arm 8 is perpendicular to the extension direction of the guide rail 7. Of course, the propulsion direction of the propulsion arm 8 and the extension direction of the guide rail 7 can also be at other angles. This embodiment is only used as an example, and the present application is not limited to the embodiment herein.

[0039] In one embodiment, the propulsion arm 8 is driven by a micro motor to lift the shape memory alloy body 9 to fit the reinforcement member. The shape memory alloy body 9 and the propulsion arm 8 may be snap-fitted. After the fixing device 4 fixes the shape memory alloy body 9 to the position to be reinforced, the shape memory alloy body 9 and the propulsion arm 8 are separated as the device body leaves.

[0040] The connecting arm 3 is a component that is rotatably connected to the device body and the guide rail 7. In one embodiment, contracting the connecting arm 3 can make the shape memory alloy body 9 separate from the concrete base and move to the position to be reinforced. The acoustic field connecting arm 3 can make the shape memory alloy body 9 close to the position to be reinforced.

[0041] According to one embodiment of the present application, the device body is provided with a negative pressure adsorption device 12 and a moving device 1, the negative pressure adsorption device 12 is used to provide adsorption force so that the device body is close to the cavity wall, and the moving device 1 is arranged at the bottom of the device body.

[0042] It can be understood that the negative pressure adsorption device 12 is a device that uses the negative pressure principle to generate adsorption force, and the negative pressure adsorption device 12 may include components such as suction cups and vacuum pumps. In this embodiment, it is used to closely adsorb the device body on the cavity wall surface to ensure the stable progress of the reinforcement operation. By creating a negative pressure area, an adsorption force is generated between the suction cup and the wall, thereby fixing the device body, thereby obtaining the ability of the device body to move freely on the vertical wall surface and the inclined wall surface, providing an intelligent and efficient carrying medium for the reinforcement of building technology.

[0043] In this embodiment, the negative pressure adsorption device 12 is provided with at least one negative pressure air chamber 13. The negative pressure air chamber 13 can be a single chamber, a double chamber, a multi-chamber structure or the like according to the medium and the load.

[0044] It can be understood that the moving device 1 is arranged at the bottom of the device body to ensure that the device body can be moved smoothly and accurately to the position to be reinforced.

[0045] According to an embodiment of the present application, the mobile device 1 includes at least one of tires and tracks.

[0046] A tire is an annular elastic rubber product that directly contacts the ground and generates rolling friction, providing support and forward momentum for the vehicle. A track is an annular transmission device composed of multiple links, used to provide stable support and propulsion on complex terrain. In this embodiment, the movement of the external prestressed reinforcement device of the structure can be selected to step by tire or track according to the difference in the medium.

[0047] It can be understood that by configuring tires or tracks at the bottom of the device body, the mobility of the entire reinforcement device in the cavity can be significantly increased. Tires are suitable for use on walls with smooth surfaces, and tracks are suitable for walls with a certain slope or unevenness. Both tires and tracks can provide stable support and propulsion to ensure that the device can be smoothly moved to the desired position.

[0048] According to one embodiment of the present application, the device body is provided with a visual image device 2. The visual image device 2 includes components such as a camera and an image sensor. In this embodiment, the visual image device 2 is installed on the device body to capture and transmit image information inside the cavity in real time, providing intuitive visual feedback to the operator. This helps the operator to more accurately locate the position to be reinforced, avoid misoperation, and improve the accuracy and efficiency of the reinforcement operation.

[0049] Combined with modern communication technology, the visual image device 2 can also support remote operation. The operator can remotely control and monitor the reinforcement device through the received image data in a safe location away from the site, further improving the safety and convenience of construction.

[0050] According to one embodiment of the present application, an infrared thermal imager is included, which is connected to the device body and is used to detect the temperature of the heating area of ​​the shape memory alloy body 9.

[0051] It is understandable that the infrared thermal imager can detect the temperature of the heating area of ​​the shape memory alloy body 9 in real time and non-contact, and provide accurate temperature data. Through accurate temperature control, the success rate and reliability of the reinforcement operation can be improved. In this embodiment, the infrared thermal imager is connected to the device body to detect the temperature of the heating area of ​​the shape memory alloy body 9, providing an accurate temperature control method for the reinforcement operation.

[0052] According to an embodiment of the present application, the fixing device 4 is one of an anchoring glue mechanical roller and a nail shooting device.

[0053] It is understandable that the anchoring glue mechanical roller is a fixing device 4 that combines the principles of anchoring glue and mechanical roller. It uses the mechanical roller to apply pressure between the shape memory alloy body 9 and the structure to be reinforced, and achieves fixation through the adhesion of the anchoring glue.

[0054] The nail shooting device is a device that fixes an object by shooting nails at high speed. In the reinforcement operation, the nail shooting device can shoot nails into the structure at the position to be reinforced to fix the shape memory alloy body 9.

[0055] According to an embodiment of the present application, a rotating platform 11 is included, a fixing device 4 is connected to the rotating platform 11 , and the fixing device 4 is arranged outside the rotating axis of the rotating platform 11 , and the fixing device 4 is slidably connected to the guide rail 7 through the rotating platform 11 .

[0056] In this embodiment, the rotating platform 11 is used to connect the fixing device 4, and the fixing device 4 is set at a position outside the rotating axis to ensure that it can rotate around the rotating axis. The fixing device 4 can change its position by rotating the rotating platform 11 and by translating on the guide rail 7, so that it can handle operations at different positions. This multi-dimensional movement capability enables the fixing device 4 to more flexibly adapt to the reinforcement requirements of different angles and positions, and improves the flexibility and adaptability of the reinforcement operation.

[0057] According to an embodiment of the present application, a grinding device 5 is included. The grinding device 5 is disposed on the rotating platform 11 , and the grinding device 5 is disposed outside the rotating axis of the rotating platform 11 .

[0058] It can be understood that the grinding device 5 is a device used to perform grinding, polishing, etc. on the surface of an object. In this embodiment, the grinding device 5 is arranged on the rotating platform 11, and can be used to pre-treat the position to be reinforced to improve the contact quality between the shape memory alloy body 9 and the structure to be reinforced, and can also be used to grind the position after the fixing device 4 is fixed.

[0059] It is understandable that the grinding device 5 is disposed on the rotating platform 11 and placed outside the rotating axis, so that the grinding operation can be flexibly operated at multiple angles and directions around the rotating axis.

[0060] According to an embodiment of the present application, please refer to Figure 3 and Figure 4 The heat radiation device 6 includes a heat radiation plate 6c, a heat transfer cover 6b and a heating wire 6a. The heating wire 6a is connected to the heat radiation plate 6c, and the heat transfer cover 6b is connected to the radiation plate 6c and is covered on the heating wire 6a.

[0061] It can be understood that the heat radiation device 6 in this embodiment generates heat through the heating wire 6a and transfers the heat to the heat radiation plate 6c. Since the heating wire 6a is covered by the heat transfer cover 6b, the heat can be more effectively concentrated on the radiation plate 6c and dissipated to the surrounding space through the radiation plate 6c.

[0062] The heat transfer cover 6b not only improves the heat radiation efficiency, but also protects the heating wire 6a. The heating wire 6a may be affected by factors such as oxygen and moisture in the air during the heating process, resulting in oxidation or short circuit. The heat transfer cover 6b can effectively isolate these adverse factors, extend the service life of the heating wire 6a, and ensure the stable operation of the heat radiation device 6.

[0063] By combining the electric heating wire 6a, the heat radiation plate 6c and the heat transfer cover 6b into an integral heat radiation device 6, it can be conveniently integrated into the reinforcement device to achieve precise heating of the shape memory alloy body 9.

[0064] According to the structural external prestressing reinforcement method applied to the above-mentioned structural external prestressing reinforcement device of this application, please refer to Figure 5 , including S1, S2 and S3.

[0065] S1. Move the shape memory alloy body 9 to the position to be reinforced.

[0066] S2. Fix the shape memory alloy body 9 to the position to be reinforced.

[0067] S3, controlling the heat radiation device 6 to start, controlling the heat radiation device 6 to move, and stimulating the shape memory alloy body 9 to produce a temperature effect.

[0068] According to the structural external prestressed reinforcement method of the present application, by adopting the shape memory alloy body 9 external prestressed reinforcement technology, active reinforcement is carried out, the performance of the reinforcement material itself is mobilized, the bearing capacity of the structure is enhanced, and the temperature excitation method is used. There is no need for tensioning equipment and manual operation, which reduces the difficulty of construction and saves labor costs.

[0069] In S1, the shape memory alloy body 9 can be moved to the position to be reinforced by the mobile device 1 and the motion component. In one embodiment, the entire body of the mobile device 1 can be moved by operating the mobile device 1, and the connecting arm 3 can be retracted or the angle of the shape memory alloy body 9 can be changed by the motion component, so as to ensure that the shape memory alloy body 9 can be accurately placed in the predetermined reinforcement position. Specifically, the connecting arm 3 is retracted to separate the shape memory alloy body 9 from the concrete base and move it to the area to be reinforced, the connecting robot arm is produced, and the propulsion arm 8 is driven to make the shape memory alloy body 9 close to the concrete substrate.

[0070] In S2, the shape memory alloy body 9 is firmly fixed to the position to be reinforced to ensure that the prestress can be stably applied during the heating process. The shape memory alloy body 9 can be fixed to the position to be reinforced by a fixing device 4, and a suitable fixing device 4 (such as an anchoring glue mechanical roller, a nailing device, etc.) can be selected to fix the shape memory alloy body 9 according to the specific conditions of the structure to be reinforced and the reinforcement requirements.

[0071] In S3, the shape memory alloy body 9 is heated by controlling the start and movement of the heat radiation device 6 to produce a temperature effect (i.e., a shape memory effect), thereby achieving prestress reinforcement of the structure. The shape memory alloy body 9 can be stimulated to produce a temperature effect and form a self-prestress by controlling the start of the heat radiation device 6.

[0072] In one embodiment, an infrared thermal imager can be used to monitor whether the temperature of the shape memory alloy body 9 reaches a preset excitation temperature. After reaching the excitation temperature, the heat radiation device 6 can be moved by the guide rail 7 so that the entire shape memory alloy body 9 can be fully thermally excited.

[0073] It should be noted that the device body can be fixed near the position to be reinforced by using a negative pressure adsorption device 12, so as to ensure the stable progress of the reinforcement operation.

[0074] In one embodiment, before step S1, the method includes: A mounting hole is drilled at the anchoring position of the shape memory alloy body 9, and a high temperature resistant colloid is brushed on the side of the shape memory alloy body 9 facing the concrete structure and on the position to be reinforced. The shape memory alloy body 9 and the propulsion arm 8 are connected by a snap.

[0075] It is understandable that the shape memory alloy body 9 can be fixed through the mounting holes at the anchoring parts, and the shape memory alloy body 9 and the concrete structure can be firmly connected through a high temperature resistant colloid, thereby further increasing the stability of the connection.

[0076] It can be understood that after the fixing device 4 fixes the shape memory alloy body 9 to the position to be reinforced, as the device body leaves, the shape memory alloy body 9 and the propulsion arm 8 are separated.

[0077] In one embodiment, after step S3, the method includes: After the shape memory alloy body 9 completes the excitation, the main body of the mobile device 1 returns to the ground end.

[0078] It can be understood that starting from moving the shape memory alloy body 9 to the position to be reinforced, after the steps of fixing, heating and excitation, the device body is finally safely returned to its original position. The entire structure external prestressing reinforcement method forms a complete closed loop. The structure external prestressing reinforcement at the next position can be carried out.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A structural external prestressing reinforcement device, characterized in that: include: Device body; A motion assembly, comprising a connecting arm (3), a guide rail (7) and a propulsion arm (8), wherein the connecting arm (3) is rotatably connected to the device body and the guide rail (7), the propulsion arm (8) is connected to the guide rail (7), and the propulsion direction of the propulsion arm (8) and the extension direction of the guide rail (7) are arranged at an angle; a shape memory alloy body (9) detachably connected to the propulsion arm (8), the shape memory alloy body (9) being suitable for approaching or moving away from the guide rail (7) through the propulsion arm (8); A fixing device (4) slidably connected to the guide rail (7) and used to fix the shape memory alloy body (9) at a position to be reinforced; A heat radiation device (6) is slidably connected to the guide rail (7) and is used to heat the shape memory alloy body (9).

2. The structure external prestressing reinforcement device according to claim 1 is characterized in that: The device body is provided with a negative pressure adsorption device (12) and a moving device (1), the negative pressure adsorption device (12) is used to provide adsorption force so that the device body is closely attached to the cavity wall, and the moving device (1) is arranged at the bottom of the device body.

3. The structure external prestressing reinforcement device according to claim 2 is characterized in that: The mobile device (1) comprises at least one of tires and tracks.

4. The structure external prestressing reinforcement device according to claim 2 is characterized in that: The device body is provided with a visual image device (2).

5. The structure external prestressing reinforcement device according to claim 1 is characterized in that: It comprises an infrared thermal imager, which is connected to the device body and is used to detect the temperature of the heating area of ​​the shape memory alloy body (9).

6. The structure external prestressing reinforcement device according to claim 1 is characterized in that: The fixing device (4) is one of an anchoring glue mechanical roller and a nail shooting device.

7. The structure external prestressing reinforcement device according to claim 1 is characterized in that: It comprises a rotating platform (11), the fixing device (4) is connected to the rotating platform (11), and the fixing device (4) is arranged outside the rotating axis of the rotating platform (11), and the fixing device (4) is slidably connected to the guide rail (7) through the rotating platform (11).

8. The structure external prestressing reinforcement device according to claim 7 is characterized in that: It comprises a grinding device (5), wherein the grinding device (5) is arranged on the rotating platform (11), and the grinding device (5) is arranged outside the rotating axis of the rotating platform (11).

9. The structural external prestressing reinforcement device according to any one of claims 1 to 8, characterized in that: The heat radiation device (6) comprises a heat radiation plate (6c), a heat transfer cover (6b) and an electric heating wire (6a); the electric heating wire (6a) is connected to the heat radiation plate (6c); the heat transfer cover (6b) is connected to the radiation plate (6c) and is arranged on the electric heating wire (6a).

10. A method for strengthening a structure by external prestressing, characterized in that: The structural external prestressed reinforcement device used in any one of claims 1 to 9 comprises: Moving the shape memory alloy body (9) to a position to be reinforced; Fixing the shape memory alloy body (9) to a position to be reinforced; The heat radiation device (6) is controlled to start, and the heat radiation device (6) is controlled to move, so as to stimulate the shape memory alloy body (9) to generate a temperature effect.

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