An in-line dam face permanent formwork anchoring repair structure and method

Abstract

This invention belongs to the technical field of thermal insulation material repair in water conservancy projects. Specifically, it discloses an embedded permanent thermal insulation template anchoring and repair structure and method for dam surfaces. The structure includes a broken bridge support structure located inside the thermal insulation template. One inner end of the broken bridge support structure is connected and fixed to the concrete dam body via an anchoring device. A connecting screw is installed inside the outer end of the broken bridge support structure. The outer end of the connecting screw has a threaded hole, and a pressure plate is installed at the outer end of the connecting screw. The threaded end of the screw passes through the central hole of the pressure plate and connects and is fixed to the threaded hole of the connecting screw, so that the pressure plate abuts against the outer protective layer of the thermal insulation template. This allows the original broken bridge support structure to be used to fix the newly replaced outer protective layer, achieving the repair of the thermal insulation template.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation material repair technology for water conservancy engineering structures, and in particular to an embedded permanent thermal insulation template anchoring repair structure and method for dam surfaces. Background Technology

[0002] Chinese patent document CN119392647A, published on February 7, 2025, discloses a template-embedded permanent thermal insulation and protection module for dam surfaces. This module is an integrated thermal insulation system developed by our company to solve the problem of temperature control and crack prevention in dam concrete in extremely cold regions. Its basic structure is as follows: Figure 1 As shown, from the outside in, the layers are: outer protective layer 1, polyurethane foam core layer 2, and inner protective layer 4. The insulation system is connected and fixed to the anchoring device 5 within the dam concrete 6 via a thermal break support structure 3, forming an integrated load-bearing system. This template has been tested and applied in a project in the cold region of Northwest my country.

[0003] During follow-up use, it was found that after installation, the nylon ring 7 at the tail of the thermal break support structure 3 of some insulation templates sank inward, such as... Figure 2 , 3 As shown, the depth is 2-5mm, and obvious cracks appear in the outer protective layer 1, such as... Figure 4 As shown. In order to repair the thermal insulation template, this application proposes an embedded permanent thermal insulation template anchoring and repair structure and method for dam surfaces. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an embedded permanent thermal insulation template anchoring and repair structure and method for dam surfaces, so as to achieve the repair of thermal insulation templates.

[0005] To achieve the above objectives, this application provides an embedded permanent thermal insulation template anchoring and repair structure for dam surfaces, including a broken bridge support structure located inside the thermal insulation template. One inner end of the broken bridge support structure is connected and fixed to the concrete dam body via an anchoring device. A connecting screw is installed inside the outer end of the broken bridge support structure. A threaded hole is provided at the outer end of the connecting screw, and a pressure plate is installed at the outer end of the connecting screw. The threaded end of the screw passes through the central hole of the pressure plate and is connected and fixed to the threaded hole of the connecting screw, so that the pressure plate abuts against the outer protective layer of the thermal insulation template.

[0006] An embedded permanent thermal insulation template anchoring repair method for dam surfaces, employing the aforementioned embedded permanent thermal insulation template anchoring repair structure, includes the following steps: S1. Determine the aging stability of the insulation template to be repaired. If the requirements are met, proceed with the repair. S2. Remove the nylon ring at one end of the outer side of the broken bridge support structure; S3. Draw a grid on the damaged outer protective layer, with each grid containing at least one thermal break support structure; S4. Cut the outer protective layer according to the marked grid, and remove the entire outer protective layer in sections to form the removal area; S5. An installation hole is made at one end of the outer side of the thermal break support structure; S6. Determine the location of the new opening on the outer protective layer by using the mounting holes on the thermal break support structure, and make the opening; simultaneously tap the internal threads of the mounting holes on the thermal break support structure. S7. Install the connecting bolt in the mounting hole at one end of the outer side of the thermal break support structure; S8. Treat the exposed surface of the polyurethane foam core layer; S9. Apply structural adhesive to one side of the new outer protective layer and attach the outer protective layer to the repair location; S10. Install a pressure plate and screws on one side of the thermal break support structure.

[0007] In S1, a dynamic model for the later expansion of the polyurethane foam core layer is established: ; In the formula, This represents the strain value at time t; Indicates the ultimate strain; Indicates the characteristic time constant; This indicates the duration calculated from the start point of the strain process; Indicates the shape index; If the indentation depth at the outer end of the thermal break support structure is measured for several consecutive days and the daily average change is no greater than the strain rate threshold, the thermal insulation template is considered to be stable.

[0008] The strain rate threshold is that the strain increment per 24 hours does not exceed 0.2%.

[0009] In S4, when cutting the outer protective layer, the saw blade cuts to a depth less than the thickness of the outer protective layer, leaving a cutting allowance to prevent damage to the polyurethane foam core layer.

[0010] In S6, determining the location of the opening on the new outer protective layer using the mounting holes includes the following steps: S6-1. Place a magnetic pen in the mounting hole of the thermal break support structure with the pen tip facing outwards. After all the magnetic pens have been placed, the pen tips should all be inside the mounting hole. S6-2. Insert thin plates into the gaps between adjacent insulation templates at both ends of the lower side of the demolition area; S6-3. Place the cut outer protective layer onto the thin plates on both sides to support the new outer protective layer. Adjust the left and right positions of the new outer protective layer according to the left and right positions of the demolition area so that the position of the new outer protective layer is completely aligned with the demolition area. At this time, the new outer protective layer is against the outside of the thermal break support structure. S6-4. With the new outer protective layer pressed and fixed, place a magnet on the outside of the new outer protective layer. By moving the position of the magnet, attract the magnetic pen to move to one side of the new outer protective layer. The tip of the magnetic pen contacts the new outer protective layer and leaves a clear mark on the new outer protective layer. S6-5. Remove the outer protective layer and make holes according to the marked points; while making holes, simultaneously tap the internal threads of the mounting holes on the broken bridge support structure.

[0011] In S8, a brush and a high-pressure air gun are used to remove dust and loose particles from the surface of the polyurethane foam core layer. A moisture content tester is used to test the polyurethane foam core layer. If the moisture content is higher than the threshold, it is dried with a hot air gun. It also includes a step of leveling the surface of the polyurethane foam core layer: S8-1. Set up a reference ruler by removing the insulation templates on both sides of the area; S8-2, the distance between the measuring reference ruler and the surface of the polyurethane foam core layer; If the spacing is less than the thickness of the outer protective layer, a heated cutting tool is used for cutting and leveling. If the spacing is greater than the thickness of the outer protective layer; when the spacing is greater than the threshold, polyurethane foam is used for filling, and after filling, a heated cutting tool is used for cutting and leveling; when the spacing is less than the threshold, polyurethane putty is used for filling and leveling.

[0012] In S10, before installing the screws, the outer protective layer is vibrated by hand-held vibrator to spread and flatten the structural adhesive and eliminate air between the outer protective layer and the polyurethane foam core layer.

[0013] Following S10, a quality inspection step is also included, which includes: Flatness is checked using a straightedge; deviation ≤ 1mm. To ensure the integrity of the bond, tap the surface lightly with a small hammer; the sound should be crisp and there should be no hollow areas. Anchoring force: Randomly selected screws were subjected to pull-out tests, and the tensile bearing capacity was ≥0.6kN.

[0014] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. This invention involves installing a connecting screw inside one end of the outer side of the thermal break support structure. The connecting screw has a threaded hole at its outer end. After replacing the outer protective layer, a pressure plate is installed at the outer end of the connecting screw. The threaded end of a screw passes through the center hole of the pressure plate and connects and fixes to the threaded hole of the connecting screw, so that the pressure plate abuts against the outer protective layer of the insulation template. This allows the original thermal break support structure to be used to fix the newly replaced outer protective layer.

[0015] 2. This invention determines the aging stability of the insulation template to be repaired, ensuring that repair is carried out only after the polyurethane inside the template has stabilized after expansion, preventing premature repair from causing the replaced outer protective layer to crack again. Remove any remaining indented or broken ends from the outer side of the thermal break support structure, i.e., remove the nylon ring, to facilitate the removal of the cracked outer protective layer. Draw a grid on the cracked outer protective layer to facilitate its segmented removal. A mounting hole is made at one end of the thermal break support structure, serving at least two purposes: first, it allows for the placement of a magnetic pen, which, in conjunction with a strong magnet, marks points on the new outer protective layer for drilling; second, it facilitates the installation of connecting screws. The exposed polyurethane foam core layer surface is treated to ensure it is smooth and clean, allowing the new outer protective layer to adhere to the polyurethane foam core layer. A pressure plate and screws are installed on one end of the outer side of the thermal break support structure to fix the new outer protective layer to the insulation system, thereby achieving the repair of the insulation template. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embedded permanent thermal insulation template structure for the dam surface.

[0018] Figure 2 This is a schematic diagram showing the inward deformation of the nylon ring supporting the thermal break structure.

[0019] Figure 3 A field photo showing the nylon ring of the embedded permanent thermal insulation template for the dam surface sinking inward.

[0020] Figure 4 A field photo showing cracks appearing in the outer protective layer of the embedded permanent thermal insulation template for the dam surface.

[0021] Figure 5 This is a schematic diagram of the repaired embedded permanent insulation template for the dam surface.

[0022] In the diagram: 1. Outer protective layer; 2. Polyurethane foam core layer; 3. Thermal break support structure; 4. Inner protective layer; 5. Anchoring device; 6. Dam concrete; 7. Nylon ring; 8. Nylon residue after indentation; 9. Polyurethane expansion direction; 10. Crack in protective layer; 11. Stress concentration area; 12. Connecting bolt; 13. Pressure plate; 14. Screw. Detailed Implementation

[0023] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0024] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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 orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1: See Figure 1 , combined Figure 5 An embedded permanent thermal insulation template anchoring and repair structure for dam surfaces includes a broken bridge support structure 3, which is located inside the thermal insulation template. One inner end of the broken bridge support structure 3 is connected and fixed to the concrete dam body 6 through an anchoring device 5. A connecting screw 12 is installed inside the outer end of the broken bridge support structure 3. A threaded hole is provided at the outer end of the connecting screw 12. A pressure plate 13 is installed at the outer end of the connecting screw 12. The threaded end of the screw 14 passes through the central hole of the pressure plate 13 and is connected and fixed to the threaded hole of the connecting screw 12 so that the pressure plate 13 abuts against the outer protective layer 1 of the thermal insulation template.

[0027] The thermal break support structure 3 is a column structure made of nylon. For initial installation, please refer to... Figure 1 The thermal insulation template is connected and fixed to the anchoring device 5 inside the dam concrete 6 through the thermal break support structure 3, and the outer protective layer 1 of the nylon ring 7 at the outer end of the thermal break support structure 3 is used for limiting.

[0028] However, during use, see Figure 2 After the main foaming reaction is completed, the foaming agent in the closed-cell polyurethane foam core layer 2 inside part of the insulation template continues to diffuse, resulting in subsequent volume expansion. This expansion force exerts an inward thrust on the nylon ring 7 at the tail of the thermal break support structure 3 along the polyurethane expansion direction 9. Due to the thinness of the nylon ring 7 and its low bending stiffness, it undergoes plastic bending and indentation under continuous thrust, such as... Figure 2 , 3 As shown. Furthermore, the outer protective layer 1 will also crack due to the stress concentration area 11 formed by this thrust, such as... Figure 4 As shown, this causes the pre-tightening force originally established by the nylon ring 7 pressing the protective layer to disappear, resulting in a decrease in thermal insulation performance and the formation of moisture channels.

[0029] This application involves installing a connecting screw 12 inside one outer end of the thermal break support structure 3. The outer end of the connecting screw 12 has a threaded hole. After replacing the outer protective layer 1, a pressure plate 13 is installed at the outer end of the connecting screw 12. The threaded end of a screw 14 passes through the center hole of the pressure plate 13 and connects and fixes to the threaded hole of the connecting screw 12, so that the pressure plate 13 abuts against the outer protective layer 1 of the insulation template. This allows the original thermal break support structure 3 to be used to fix the newly replaced outer protective layer 1.

[0030] Example 2: This application also proposes a method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces, which adopts an embedded permanent thermal insulation template anchoring and repair structure as described in Example 1. The repair method includes the following steps: S1. Determine the aging stability of the insulation template to be repaired. If the requirements are met, proceed with the repair. S2. Remove the nylon ring 7 from one side of the broken bridge support structure 3; S3. Draw a grid on the fractured outer protective layer 1, with each grid containing at least one broken bridge support structure 3; S4. Cut the outer protective layer 1 according to the marked grid, and remove the entire outer protective layer 1 in sections to form the removal area; S5. An installation hole is made at one end of the outer side of the thermal break support structure 3. S6. Determine the opening position on the new outer protective layer 1 through the mounting holes opened on the thermal break support structure 3, and make the holes; simultaneously tap the internal threads of the mounting holes on the thermal break support structure 3. S7. Install the connecting screw 12 in the mounting hole at one end of the outer side of the broken bridge support structure 3; S8. Treat the surface of the exposed polyurethane foam core layer 2. S9. Apply structural adhesive to one side of the new outer protective layer 1 and attach the outer protective layer 1 to the repair position; S10. Install a pressure plate 13 and screws 14 on one side of the outer side of the thermal break support structure 3.

[0031] By assessing the aging stability of the insulation template to be repaired, ensure that repairs are carried out only after the polyurethane inside the template has fully expanded and stabilized, preventing premature repairs that could lead to the replacement outer protective layer 1 cracking again. Remove any remaining indentations or breaks at one end of the outer side of the thermal break support structure 3, specifically the nylon ring 7, to facilitate the removal of the cracked outer protective layer 1. Draw a grid on the cracked outer protective layer 1 to facilitate its segmented removal. Create mounting holes at one end of the outer side of the thermal break support structure 3. This serves at least two purposes: firstly, it allows for the placement of a magnetic pen within the mounting hole, enabling the marking of points on the new outer protective layer 1 using the pen and a strong magnet; secondly, it facilitates the installation of the connecting screws 12. Treat the exposed surface of the polyurethane foam core layer 2 to ensure it is smooth and clean, allowing the new outer protective layer 1 to adhere to it. A pressure plate 13 and screws 14 are installed on one side of the thermal break support structure 3 to fix the new outer protective layer 1 to the insulation system, thereby achieving the repair of the insulation template.

[0032] Specifically, in S1, a dynamic model of the later expansion of the polyurethane foam core layer 2 is established: ; In the formula, This represents the strain value at time t; Indicates the ultimate strain; Indicates the characteristic time constant; This indicates the duration calculated from the start point of the strain process; Indicates the shape index.

[0033] It represents the ultimate strain, which is related to the foaming formula, density and ambient humidity. The measured range is 1.8% to 2.8%, with a typical value of 2.2%.

[0034] The shape index is represented by n, which reflects the non-ideal nature of the expansion process. Due to the viscoelastic constraints of polyurethane, n is usually taken as 0.7.

[0035] For three consecutive days, the indentation depth at the outer end of the thermal break support structure 3 was measured. If the daily average change did not exceed the strain rate threshold, the insulation template was considered to be stable, and repairs could then be carried out. This avoids repairs being performed before the polyurethane expansion has stabilized.

[0036] In this embodiment, the strain rate threshold is that the strain increment per 24 hours does not exceed 0.2%.

[0037] In S2, for the concave residual nylon ring 7, use needle-nose pliers to rotate and pull it out along the axial direction; for the convex or intact type, use a handheld cutter to cut it off along the base surface.

[0038] In S3, a square grid is drawn on the surface of the outer protective layer 1, centered on the damaged area and with the location of the broken bridge support structure 3 as the grid node. The side length L is 20~30cm. Each grid contains one broken bridge support structure 3, which facilitates the dismantling of the outer protective layer 1 in sections.

[0039] In S4, when cutting the outer protective layer 1, the cutting depth of the saw blade is less than the thickness of the outer protective layer 1, leaving a cutting allowance to prevent damage to the polyurethane foam core layer 2.

[0040] In S5, first determine the center of the outer end of the broken bridge support structure 3 and mark it; then use a hand drill to hold the drill bit and drill a hole to form the installation hole.

[0041] In S6, the location of the opening on the new outer protective layer 1 is determined through the mounting holes, including the following steps: S6-1. Place a magnetic pen in the mounting hole of the broken bridge support structure 3 with the pen tip facing outward. After all the magnetic pens have been placed, the pen tips of all the magnetic pens should be inside the mounting hole. S6-2. Insert thin plates into the gaps between adjacent insulation templates at both ends of the lower side of the demolition area; S6-3. Place the cut outer protective layer 1 onto the thin plates on both sides to support the new outer protective layer 1. Adjust the left and right positions of the new outer protective layer 1 according to the left and right positions of the demolition area so that the position of the new outer protective layer 1 is completely aligned with the demolition area. At this time, the new outer protective layer 1 is against the outside of the broken bridge support structure 3. S6-4. With the new outer protective layer 1 pressed and fixed, place a magnet on the outside of the new outer protective layer 1. By moving the position of the magnet, attract the magnetic pen to move to one side of the new outer protective layer 1. The tip of the magnetic pen contacts the new outer protective layer 1 and leaves a clear mark on the new outer protective layer 1. S6-5. Remove the outer protective layer 1 and make holes according to the marked points; while making holes, simultaneously tap the internal threads of the mounting holes on the broken bridge support structure 3.

[0042] In the S6, the magnetic pen used includes an iron or steel cylinder, one end of which is closed and the other end is into which a pen tip is inserted. The pen tip can be a marker pen tip, and ink is injected into the cylinder.

[0043] When using the magnetic pen, first place it into the mounting hole with the tip facing outwards. The depth of the mounting hole should be greater than the length of the magnetic pen. When adjusting the position of the new outer protective layer 1 on the outside of the broken bridge support structure 3, the pen tip should be inside the mounting hole and not in contact with the new outer protective layer 1, thus not leaving a mark on it. Furthermore, the inner diameter of the mounting hole should be slightly larger than the outer diameter of the magnetic pen's body, allowing the magnetic pen to move axially and be roughly aligned with the axis of the mounting hole, ensuring the accuracy of the marking points. After the new outer protective layer 1 is placed on the thin plate and its position adjusted, place a strong magnet on the outside of the new outer protective layer 1. By moving the magnet, when it reaches the corresponding outside of the broken bridge support structure 3, it attracts the magnetic pen to move towards the new outer protective layer 1. The tip of the magnetic pen contacts and impacts the new outer protective layer 1, leaving a clear marking point on it, facilitating drilling on the new outer protective layer 1 and ensuring the accuracy of the drilling. When drilling holes in the new outer protective layer 1, the mounting holes on the broken bridge support structure 3 can be tapped simultaneously to shorten the overall repair time.

[0044] In S7, the outer wall of the connecting screw 12 has external threads, and the connecting screw 12 is screwed and fixed in the mounting hole of the broken bridge support structure 3.

[0045] In step S8, a brush and a high-pressure air gun are used to remove dust and loose particles from the surface of the polyurethane foam core layer 2. A moisture content tester is used to test the polyurethane foam core layer 2. If the moisture content is higher than 8%, it is dried with a hot air gun. The exposed surface of the polyurethane foam core layer 2 is treated to make the surface of the polyurethane foam core layer 2 smooth and clean, so that the new outer protective layer 1 adheres to the polyurethane foam core layer 2.

[0046] Furthermore, it also includes a step of leveling the surface of the polyurethane foam core layer 2: S8-1. Set up a reference ruler by removing the insulation templates on both sides of the area; S8-2, Measurement of the distance between the reference ruler and the surface of the polyurethane foam core layer 2; If the spacing is less than the thickness of the outer protective layer 1, it indicates that the polyurethane foam core layer 2 is protruding outward. In this case, a heated cutting tool is used to cut and level the surface to ensure that the new outer protective layer 1 is flat and adhered.

[0047] If the spacing is greater than the thickness of the outer protective layer 1, it indicates that there are pits in the polyurethane foam core layer 2. These pits may have been left from the removal of the ruptured outer protective layer 1. When the spacing is greater than a threshold, it is filled with polyurethane foaming agent. After filling, it is cut and leveled using a heated cutting tool. When the spacing is less than the threshold, it is filled and leveled with polyurethane putty. This ensures a smooth and adherent new outer protective layer 1.

[0048] S9. Apply structural adhesive to one side of the new outer protective layer 1, on the side marked with a magnetic pen. The adhesive thickness should be 0.5-1mm. Then, attach the outer protective layer 1 to the repair location. When attaching, align the holes on the new outer protective layer 1 with the mounting holes on the thermal break support structure 3.

[0049] In S10, before installing screw 14, the outer protective layer 1 is vibrated by hand-held vibrator to spread and flatten the structural adhesive and eliminate the air between the outer protective layer 1 and the polyurethane foam core layer 2.

[0050] Following S10, a quality inspection step is also included, which includes: Flatness is checked using a straightedge; deviation ≤ 1mm. To ensure the integrity of the bond, tap the surface lightly with a small hammer; the sound should be crisp and there should be no hollow areas. Anchoring force: 14 screws were randomly selected for pull-out testing, and the tensile bearing capacity was ≥0.6kN.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A structure for anchoring and repairing an embedded dam surface permanent formwork, comprising a broken bridge support structure (3) located inside the permanent formwork, one end of the inner side of the broken bridge support structure (3) being connected and fixed with the concrete dam body (6) through an anchoring device (5), characterized in that, A connecting screw (12) is installed inside one of the outer ends of the broken bridge support structure (3). The connecting screw (12) has a threaded hole at the outer end. A pressure plate (13) is installed at the outer end of the connecting screw (12). The threaded end of the screw (14) passes through the center hole of the pressure plate (13) and is connected and fixed to the threaded hole of the connecting screw (12) so that the pressure plate (13) abuts against the outer protective layer (1) of the thermal insulation template.

2. A method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces, characterized in that, The embedded permanent thermal insulation template anchoring and repair structure for dam surfaces as described in claim 1 is used, and the repair method includes the following steps: S1. Determine the aging stability of the insulation template to be repaired. If the requirements are met, proceed with the repair. S2. Remove the nylon ring (7) from the outer end of the broken bridge support structure (3); S3. Draw a grid on the damaged outer protective layer (1), with each grid containing at least one broken bridge support structure (3). S4. Cut the outer protective layer (1) according to the grid marked out, and remove the entire outer protective layer (1) in sections to form the removal area; S5. An installation hole is made at one end of the outer side of the broken bridge support structure (3); S6. Determine the opening position on the new outer protective layer (1) through the mounting holes opened on the thermal break support structure (3), and make the holes; simultaneously tap the internal threads of the mounting holes on the thermal break support structure (3); S7. Install the connecting screw (12) in the mounting hole at one end of the outer side of the broken bridge support structure (3); S8. Treat the surface of the exposed polyurethane foam core layer (2); S9. Apply structural adhesive to one side of the new outer protective layer (1) and attach the outer protective layer (1) to the repair position; S10. Install a pressure plate (13) and screws (14) on one side of the outer side of the broken bridge support structure (3).

3. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, In S1, a dynamic model of the later expansion of the polyurethane foam core layer (2) is established: ； In the formula, This represents the strain value at time t; Indicates the ultimate strain; Indicates the characteristic time constant; This indicates the duration calculated from the start point of the strain process; Indicates the shape index; If the indentation depth of the outer end of the broken bridge support structure (3) is measured for several consecutive days and the daily average change is not greater than the strain rate threshold, it is determined that the thermal insulation template tends to be stable.

4. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 3, characterized in that, The strain rate threshold is that the strain increment per 24 hours does not exceed 0.2%.

5. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, In S4, when cutting the outer protective layer (1), the cutting depth of the saw blade is less than the thickness of the outer protective layer (1), leaving a cutting allowance to prevent damage to the polyurethane foam core layer (2).

6. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, In S6, the location of the opening on the new outer protective layer (1) is determined by the mounting holes, including the following steps: S6-1. Place a magnetic pen in the mounting hole of the broken bridge support structure (3), with the pen tip facing outward. After all the magnetic pens are placed, the pen tips of the magnetic pens are all located in the mounting hole. S6-2. Insert thin plates into the gaps between adjacent insulation templates at both ends of the lower side of the demolition area; S6-3. Place the cut outer protective layer (1) onto the thin plates on both sides to support the new outer protective layer (1). Adjust the left and right positions of the new outer protective layer (1) according to the left and right positions of the demolition area so that the position of the new outer protective layer (1) is completely aligned with the demolition area. At this time, the new outer protective layer (1) is against the outside of the broken bridge support structure (3). S6-4. With the new outer protective layer (1) pressed and fixed, place a magnet on the outside of the new outer protective layer (1). By moving the position of the magnet, attract the magnetic pen to move to the side of the new outer protective layer (1). The tip of the magnetic pen contacts the new outer protective layer (1) and leaves a clear mark on the new outer protective layer (1). S6-5. Remove the outer protective layer (1) and make holes according to the marked points; while making holes, simultaneously tap the internal threads of the mounting holes on the broken bridge support structure (3).

7. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, In S8, a brush and a high-pressure air gun are used to remove dust and loose particles from the surface of the polyurethane foam core layer (2). The moisture content of the polyurethane foam core layer (2) is tested using a moisture content tester. If the moisture content is higher than the threshold, it is dried with a hot air gun.

8. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 7, characterized in that, It also includes the step of leveling the surface of the polyurethane foam core layer (2): S8-1. Set up a reference ruler by removing the insulation templates on both sides of the area; S8-2, the distance between the measuring reference ruler and the surface of the polyurethane foam core layer (2); If the spacing is less than the thickness of the outer protective layer (1), a heated cutting tool is used for cutting and leveling. If the spacing is greater than the thickness of the outer protective layer (1); when the spacing is greater than the threshold, polyurethane foaming agent is used for filling, and after filling, a heated cutting knife is used for cutting and leveling; when the spacing is less than the threshold, polyurethane putty is used for filling and leveling.

9. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, In S10, before installing the screws (14), the outer protective layer (1) is vibrated by hand-held vibrator to spread and flatten the structural adhesive and eliminate the air between the outer protective layer (1) and the polyurethane foam core layer (2).

10. The method for anchoring and repairing embedded permanent thermal insulation templates for dam surfaces according to claim 2, characterized in that, Following S10, a quality inspection step is also included, which includes: Flatness is checked using a straightedge; deviation ≤ 1mm. To ensure the integrity of the bond, tap the surface lightly with a small hammer; the sound should be crisp and there should be no hollow areas. Anchoring force: Randomly select screws (14) for pull-out test, tensile bearing capacity ≥0.6kN.

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