Construction method of water-tight structure of water tunnel expansion joint

Abstract

A construction method of a water conservancy tunnel expansion joint water stop structure, comprising: cleaning the expansion joint and polishing the concrete surface on both sides of the expansion joint; placing an elastic rubber sealing rod in the middle of the expansion joint along the length direction of the expansion joint; inserting a waterproof film into the expansion joint, tightly abutting the outer side of the elastic rubber sealing rod; high-pressure pouring polyurea to the surface of the expansion joint outside the waterproof film, grinding and then curing; polishing the surface of the polyurea and the concrete surface on both sides of the expansion joint; spraying polyurethane paint on the concrete surface and the polyurea surface; wherein the elastic rubber sealing rod is determined based on the water temperature, the maximum water temperature, the minimum water temperature and the average tunnel air temperature of the tunnel, and the elastic rubber sealing rod is made based on the radius and the maximum compression amount. The water stop structure design of the present application adapts to the expansion joint, effectively solves the leakage problem of the water conservancy tunnel, and improves the overall water delivery rate and durability of the project.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering seepage prevention and reinforcement technology, specifically to a construction method for a water-stopping structure for expansion joints in hydraulic tunnels. Background Technology

[0002] Water conveyance tunnels are one of the main methods of water transfer projects and an important way to optimize water resources and improve water security capabilities.

[0003] Water conveyance tunnels typically employ concrete lining for support. To ensure tunnel safety and prevent lining cracking, expansion joints are installed every 6-12 meters, with copper waterstops, chemical grouting, or waterproof membranes or coatings applied to the lining surface between these joints. However, research has shown that these three methods each have their drawbacks. Copper waterstops, or the epoxy or polyurethane grouts commonly used in tunnel pressure test boreholes, are rigid materials that struggle to adapt to joint deformation. While waterproof membranes or coatings applied to the expansion joint surface effectively resist internal tunnel water pressure, they offer poor resistance to external water pressure, are prone to peeling, and ultimately lose their leak-proof function. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for a water-stop structure for expansion joints in hydraulic tunnels. This water-stop structure can adapt to the deformation of expansion joints and solve the leakage problem in the design or repair of hydraulic tunnels.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A construction method for a water-stopping structure for expansion joints in hydraulic tunnels, the construction method comprising: Clean the expansion joint and grind the concrete surface on both sides of the expansion joint to make it clean, flat and dry; An elastic rubber sealing rod is inserted into the middle of the expansion joint along its length. Insert the waterproof membrane into the expansion joint, and attach it tightly to the outside of the elastic rubber sealing rod; Polyurea is injected under high pressure onto the surface of the expansion joint from the outside of the waterproof membrane, then ground smooth and cured. Grind the polyurea surface and the concrete surfaces on both sides of the expansion joint to make the concrete surface and polyurea surface smooth. Spray polyurethane coating onto concrete and polyurea surfaces, and sand them smooth after they have cured. The elastic rubber sealing rod is manufactured based on the water temperature, highest water temperature, lowest water temperature and average tunnel air temperature of the tunnel, and its radius and maximum compression amount are determined by verification.

[0006] In one embodiment, the step of "verifying and determining the radius and maximum compression based on the tunnel's water temperature, highest water temperature, lowest water temperature, and average tunnel air temperature" includes: Step S1: Obtain the monthly average water temperature and average tunnel air temperature for each month in the tunnel; Step S2: The average monthly water temperature corresponding to the water flow in the tunnel is taken as the water flow temperature, the highest average monthly water temperature is taken as the highest water temperature, and the lowest average monthly water temperature is taken as the lowest water temperature. Step S3: Obtain the initial width of the expansion joint before the tunnel is filled with water; Step S4: Initially determine the radius and maximum compression of the elastic rubber rod; Step S5: Verify whether the radius and / or maximum compression of the elastic rubber sealing rod meet the requirement of preventing leakage in the tunnel under the conditions of water temperature, highest water temperature, and lowest water temperature. Step S6: If the requirements are not met, the radius and maximum compression of the rubber rod are redefined, and step S5 is repeated until the requirements are met.

[0007] In one embodiment, the step of "verifying whether the radius and / or maximum compression of the elastic rubber sealing rod meet the requirement of preventing tunnel leakage under the conditions of water temperature, highest water temperature, and lowest water temperature respectively" includes: When verifying the water temperature, check the radius and maximum compression of the elastic rubber sealing rod; The maximum compression of the elastic rubber sealing rod when the highest water temperature is checked; When verifying the lowest water temperature, determine the radius and maximum compression of the elastic rubber sealing rod.

[0008] In one embodiment, the step of "verifying the radius and maximum compression of the elastic rubber sealing rod when the water temperature is changed" includes: Calculate the temperature difference between the average tunnel air temperature and the circulating water temperature. ;

[0009] In the formula, To regulate water temperature, The average tunnel temperature; Calculate the deformation of the expansion joint and the elastic rubber sealing rod caused by the temperature boundary change. and :

[0010]

[0011] In the formula, The linear expansion coefficient of the tunnel lining. L is the coefficient of linear expansion of the elastic rubber sealing rod, and L0 is the distance between two adjacent expansion joints inside the tunnel. This represents the initial width of the expansion joint; The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: when :

[0012] when :

[0013] when :

[0014] In the formula, The elastic modulus of the elastic rubber sealing rod. R is the permanent compression deformation rate of the elastic rubber sealing rod, R is the radius of the elastic rubber sealing rod, and k is the preset safety factor. For internal water pressure, This refers to the contact length between the elastic rubber sealing rod and the lining. , The coefficient of friction between rubber and concrete; If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements. The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: when :

[0015] when :

[0016] when :

[0017] If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0018] In one embodiment, the step of "verifying the maximum compression of the elastic rubber sealing rod at the highest water temperature" includes: The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: Calculate the temperature difference between the circulating water temperature and the highest air temperature. :

[0019] In the formula, This is the highest water temperature; Calculate the deformation of the expansion joint :

[0020] Calculate the expansion of the elastic rubber sealing rod due to temperature rise. :

[0021] Calculate the maximum compression of the rubber rod:

[0022] If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0023] In one embodiment, the step of "verifying the radius and maximum compression of the elastic rubber sealing rod at the lowest water temperature" includes: The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: Calculate the temperature difference between the initial water temperature and the lowest water temperature. :

[0024] In the formula, The lowest water temperature; Calculate the deformation of the expansion joint :

[0025] Calculate the shrinkage of the elastic rubber sealing rod due to temperature decrease. :

[0026] The radius of the elastic rubber sealing rod is verified using the method shown in the following formula:

[0027] In the formula, The width of the expansion joint of the elastic rubber sealing rod If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements. The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula:

[0028] If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0029] In one embodiment, the width of the expansion joint of the elastic rubber sealing rod As shown in the following formula: .

[0030] The advantages of this invention are: The construction method of the expansion joint water-stop structure of hydraulic tunnels provided by this invention can effectively prevent leakage at the tunnel joint and provide a modification solution when leakage occurs. The construction method is simple, can be adapted to the deformation of expansion joints, solves the leakage problem in the design or repair of hydraulic tunnels, improves the high-quality construction of projects, and realizes the long-term management of water conveyance tunnels.

[0031] Furthermore, by calculating the maximum diameter and maximum compression of the required elastic rubber sealing rod, and by controlling the hardness of the rubber and the number and size of the cavities inside the rubber rod, the size of the elastic rubber sealing rod that meets the sealing requirements of the expansion joint can be obtained, thereby adapting to the deformation of the expansion joint and improving the safety and durability of the water conveyance tunnel. Attached Figure Description

[0032] Figure 1 This is a schematic flowchart of the construction method for a water-stopping structure for expansion joints in hydraulic tunnels according to the present invention. Figure 2 This is a cross-sectional schematic diagram of a water-stopping structure for expansion joints in hydraulic tunnels and an elastic rubber sealing rod according to the present invention. Detailed Implementation

[0033] The present invention provides a construction method for a water-stop structure for expansion joints in hydraulic tunnels. Addressing the deformation characteristics of tunnel expansion joints due to temperature changes, the method employs an elastic cylindrical rubber sealing rod with a certain deformation capacity. After inserting the rod into the expansion joint, a waterproof membrane is laid, and the physical interface is treated with polyurea and polyurethane waterproof coatings. The expansion joint is then filled and repaired to the lining surface, making it flush with the lining surface. This deformation-adaptive water-stop structure design overcomes the shortcomings of traditional expansion joint treatment / repair methods, such as their inability to adapt to expansion joint deformation and poor resistance to external water pressure. This effectively solves the leakage problem in hydraulic tunnels and improves the overall water conveyance rate and durability of the project. The invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] See appendix Figure 1 and Figure 2 , Figure 1 The present invention provides an exemplary process for constructing a water-stop structure for expansion joints in hydraulic tunnels. Figure 2 This is a schematic cross-sectional view of the expansion joint sealing structure and an elastic rubber sealing rod in a hydraulic tunnel. Figure 1 As shown in this embodiment, the construction method for the water-stopping structure of the expansion joint of a hydraulic tunnel includes: Step Sa1: Clean the expansion joint 1 and grind the concrete surface on both sides of the expansion joint 1 to ensure that the surface is clean, flat and dry. Specifically, before inserting the elastic rubber seal 2 rod into the expansion joint 1, it is necessary to clean the expansion joint 1 and its surface to ensure that the inside of the expansion joint 1 is dry; the concrete surface within 30cm on both sides of the expansion joint 1 can be ground to ensure that the concrete surface is clean, flat and dry.

[0035] Step Sa2: Insert an elastic rubber sealing rod 2 into the middle of the expansion joint 1 along its length. Specifically, insert the elastic rubber sealing rod 2 into the middle of the expansion joint 1 at a distance of 1 / 2 the thickness of the lining surface. The elastic rubber sealing rod 2 is composed of an elastic body with a closed cell cavity structure, a smooth surface, and a circular cross-section. The rubber rod has a uniform cavity structure inside, which is used for elastic compression.

[0036] Step Sa3: Insert the waterproof membrane 3 into the expansion joint, tightly adhering to the outer side of the elastic rubber sealing rod 2. Specifically, the waterproof membrane 3 is inserted tightly onto the outer surface of the elastic rubber sealing rod 2.

[0037] Step Sa4: High-pressure injection of polyurea 4 into the surface of expansion joint 1 on the outside of waterproof membrane 3, followed by grinding and curing.

[0038] Step Sa5: Grind the surface of polyurea 4 and the concrete surfaces on both sides of expansion joint 1 to make the concrete surface and polyurea surface smooth.

[0039] Step Sa6: Spray polyurethane coating 5 onto the concrete surface and the polyurea 4 surface, and sand it smooth after it has cured. Specifically, spraying polyurethane coating 5 seals the surface and prevents water penetration. After the polyurethane has cured, sand the edges of the polyurethane coating to prevent the formation of bevels.

[0040] Among them, the radius and maximum compression of the elastic rubber sealing rod 2 are determined based on the tunnel's water temperature, highest water temperature, lowest water temperature, and average tunnel air temperature, and the elastic rubber sealing rod 2 is manufactured based on this radius and maximum compression. Based on the deformation characteristics of the expansion joint 1, by predicting the compression deformation of the expansion joint 1 and the elastic rubber sealing rod 2 at different water flow stages, a water-stopping structure is proposed to ensure that the sealing material of the tunnel expansion joint 1 does not slip when subjected to water pressure, providing theoretical support and technical guarantee for the long-term operational safety of the project.

[0041] The verification steps for the radius and maximum compression of the elastic rubber sealing rod are shown in steps S1 to S6: Step S1: Obtain the monthly average water temperature and average tunnel temperature for each month inside the tunnel.

[0042] Specifically, the construction project selected in this embodiment is located in Beijing, where expansion joints are reserved every 12m in the tunnel lining, with a width of 2cm, and the linear expansion coefficient of the lining concrete is 1×10⁻⁶. -5 / ℃. It is initially proposed to use an elastic modulus of 1 MPa and a coefficient of linear expansion of 1 × 10⁻⁶. -4 / ℃, permanent compression deformation rate is 5%. When the tunnel is running with water, the internal water pressure on the lining is 0.2MPa.

[0043] This allows for the investigation and acquisition of annual water temperature variations during tunnel operation, as well as air temperature data within the tunnel; recording the multi-year average water temperature for each month at the project site; and noting that since the air temperature within a deeply buried tunnel does not change with the seasons, the average tunnel air temperature is recorded as the average value over a specific period, denoted as T. a .

[0044] The air temperature inside the cave in the selected embodiment of this invention is 16℃. The measured water temperature data of the water circulating in the ground during the project are shown in Table 1.

[0045] Table 1. Measured monthly average water temperature

[0046] Step S2: The average monthly water temperature corresponding to the time when water is flowing through the tunnel is taken as the water temperature, the highest monthly average water temperature is taken as the maximum water temperature, and the lowest monthly average water temperature is taken as the minimum water temperature. In this embodiment, according to the design plan, the tunnel will be saturated with water in June, with a water temperature of 25°C, a maximum water temperature of 30.9°C, and a minimum water temperature of 2.8°C.

[0047] Step S3: Obtain the initial width of the expansion joint before the tunnel is filled with water. In this embodiment, the measured initial expansion joint width d0 is 2cm.

[0048] Step S4: Preliminarily determine the radius and maximum compression of the elastic rubber sealing rod. The preliminary determined radius of the rubber sealing rod is 2.5cm, and the maximum compression is 3cm.

[0049] Step S5: Verify whether the radius and / or maximum compression of the elastic rubber sealing rod meet the requirements of preventing leakage in the tunnel under the conditions of water temperature, highest water temperature, and lowest water temperature.

[0050] Specifically, the radius and maximum compression of the elastic rubber sealing rod are verified at different water temperatures; the maximum compression of the elastic rubber sealing rod is verified at the highest water temperature; and the radius and maximum compression of the elastic rubber sealing rod are verified at the lowest water temperature.

[0051] The steps for verifying the radius and maximum compression of the elastic rubber sealing rod during water temperature testing include: 1.1 Calculate the temperature difference between the average tunnel air temperature and the circulating water temperature. ; (1) In the formula, To regulate water temperature, This represents the average tunnel temperature.

[0052] 1.2 Calculate the deformation of the expansion joint and the elastic rubber sealing rod caused by the temperature boundary change. and : (2) (3) In the formula, The linear expansion coefficient of the tunnel lining. L is the coefficient of linear expansion of the elastic rubber sealing rod, and L0 is the distance between two adjacent expansion joints inside the tunnel. This represents the initial width of the expansion joint; 1.3 Verify the radius of the elastic rubber sealing rod using the method shown in the following formula: when : (4) when : (5) when : (6) In the formula, The elastic modulus of the elastic rubber sealing rod. R is the permanent compression deformation rate of the elastic rubber sealing rod, R is the radius of the elastic rubber sealing rod, and k is the preset safety factor, which is taken as 1.5. For internal water pressure, This refers to the contact length between the elastic rubber sealing rod and the lining. , The coefficient of friction between rubber and concrete; 1.4 If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements. The left side of equations (4), (5), and (6) represents the anti-slip force, and the right side represents the sliding force. If the above conditions are met, then the radius of the elastic rubber sealing rod is considered to meet the requirements.

[0053] 1.5 Verify the maximum compression of the elastic rubber sealing rod using the method shown in the following formula: when : (7) when : (8) when : (9) If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0054] When water is flowing through, the width of the expansion joint of the elastic rubber sealing rod... As shown in the following formula: (10) In this embodiment, during water flow, the temperature difference between the average tunnel air temperature and the water temperature is: (11) The deformation of the expansion joint and the elastic rubber sealing rod is: (12) (13) After water storage is completed, verify whether the initially proposed radius of the elastic rubber sealing rod meets the requirement of preventing slippage: (14) (15) The requirement that the resisting force > the sliding force must be met.

[0055] The maximum compression is: (16) When water is supplied, the width of the expansion joint of the elastic rubber sealing rod The value is 0.02108m. It can be seen that the initially proposed radius of the rubber sealing rod is 2.5cm, and the maximum compression is 3cm, which meets the requirements under this condition.

[0056] The steps for verifying the maximum compression of the elastic rubber sealing rod at the highest water temperature include: The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: 2.1 Calculate the temperature difference between the highest water temperature and the circulating water temperature. : (17) In the formula, This is the highest water temperature; 2.2 Calculate the deformation of the expansion joint : (18) 2.3 Calculate the expansion of the elastic rubber sealing rod caused by temperature rise. : (19) 2.4 Calculate the maximum compression of the rubber rod: (20) 2.5 If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0057] In this embodiment, the temperature difference ; The expansion amounts of the expansion joint and the elastic rubber sealing rod are respectively: (twenty one) (twenty two) The maximum compression is: (twenty three) The initially proposed radius of the rubber sealing rod is 2.5cm, and the maximum compression is 3cm, which meets the requirements under this condition.

[0058] The steps for verifying the radius and maximum compression of the elastic rubber sealing rod at the lowest water temperature include: The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: 3.1 Calculate the temperature difference between the circulating water temperature and the lowest water temperature. : (twenty four) In the formula, The lowest water temperature; 3.2 Calculate the deformation of the expansion joint : (25) 3.3 Calculate the shrinkage of the elastic rubber sealing rod caused by temperature decrease. : (26) 3.4 Verify the radius of the elastic rubber sealing rod using the method shown in the following formula: (27) In the formula, The width of the expansion joint of the elastic rubber sealing rod; 3.5 If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements; 3.6 Verify the maximum compression of the elastic rubber sealing rod using the method shown in the following formula: (28) 3.7 If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

[0059] In this embodiment, the temperature difference is The deformation of the expansion joint and the elastic rubber sealing rod is: (29) (30) Minimum radius verification: (31) (32) The requirement that anti-slip force > sliding force must be met.

[0060] Maximum compression The proposed maximum compression is greater than the calculated value, which meets the requirements.

[0061] Step S6: If the requirements are not met, the radius and maximum compression of the elastic rubber sealing rod are redefined, and step S5 is repeated until the requirements are met.

[0062] By calculating and verifying that the tunnel does not leak at each stage after water supply operation (water temperature, highest water temperature, lowest water temperature), the radius and maximum compression of the elastic rubber sealing rod are determined to meet the requirements. After determining the radius and maximum compression of the elastic rubber sealing rod, it is manufactured for on-site installation. By changing the number and size of the cavities within the elastic rubber sealing rod and testing the compression on both sides, the optimal number, location, and size of the cavities are determined.

[0063] The above description describes the preferred embodiments of the present invention and the technical principles applied thereto. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solutions of the present invention, without departing from the spirit and scope of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A construction method for a water-stopping structure for expansion joints in hydraulic tunnels, characterized in that, The construction method includes: Clean the expansion joint and grind the concrete surface on both sides of the expansion joint to make it clean, flat and dry; An elastic rubber sealing rod is inserted into the middle of the expansion joint along its length. Insert the waterproof membrane into the expansion joint, and attach it tightly to the outside of the elastic rubber sealing rod; Polyurea is injected under high pressure onto the surface of the expansion joint from the outside of the waterproof membrane, then ground smooth and cured. Grind the polyurea surface and the concrete surfaces on both sides of the expansion joint to make the concrete surface and polyurea surface smooth. Spray polyurethane coating onto concrete and polyurea surfaces, and sand them smooth after they have cured. The elastic rubber sealing rod's radius and maximum compression are determined based on the tunnel's water temperature, highest water temperature, lowest water temperature, and average tunnel air temperature, and the elastic rubber sealing rod is manufactured based on this radius and maximum compression. The steps for determining the radius and maximum compression of the elastic rubber sealing rod include: Step S1: Obtain the monthly average water temperature and average tunnel air temperature for each month inside the tunnel; Step S2: The average monthly water temperature corresponding to the water flow in the tunnel is taken as the water flow temperature, the highest average monthly water temperature is taken as the highest water temperature, and the lowest average monthly water temperature is taken as the lowest water temperature. Step S3: Obtain the initial width of the expansion joint before the tunnel is filled with water; Step S4: Initially determine the radius and maximum compression of the elastic rubber rod; Step S5: Verify whether the radius and / or maximum compression of the elastic rubber sealing rod meet the requirement of preventing leakage in the tunnel under the conditions of water temperature, highest water temperature, and lowest water temperature. Step S6: If the requirements are not met, the radius and maximum compression of the rubber rod are redefined, and step S5 is repeated until the requirements are met.

2. The construction method of the water-stopping structure for expansion joints in hydraulic tunnels as described in claim 1, characterized in that, The steps of "verifying whether the radius and / or maximum compression of the elastic rubber sealing rod meet the requirements for preventing tunnel leakage under the conditions of water temperature, highest water temperature, and lowest water temperature" include: When verifying the water temperature, check the radius and maximum compression of the elastic rubber sealing rod; The maximum compression of the elastic rubber sealing rod when the highest water temperature is checked; When verifying the lowest water temperature, determine the radius and maximum compression of the elastic rubber sealing rod.

3. The construction method of the water-stopping structure for expansion joints in hydraulic tunnels as described in claim 2, characterized in that, The steps for "verifying the radius and maximum compression of the elastic rubber sealing rod when the water temperature is turned on" include: Calculate the temperature difference between the average tunnel air temperature and the circulating water temperature. ; In the formula, To regulate water temperature, The average tunnel temperature; Calculate the deformation of the expansion joint and the elastic rubber sealing rod caused by the temperature boundary change. and : In the formula, The linear expansion coefficient of the tunnel lining. L is the coefficient of linear expansion of the elastic rubber sealing rod, and L0 is the distance between two adjacent expansion joints inside the tunnel. This represents the initial width of the expansion joint; The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: when : when : when : In the formula, The elastic modulus of the elastic rubber sealing rod. R is the permanent compression deformation rate of the elastic rubber sealing rod, R is the radius of the elastic rubber sealing rod, and k is the preset safety factor. For internal water pressure, This refers to the contact length between the elastic rubber sealing rod and the lining. , The coefficient of friction between rubber and concrete; If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements. The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: when : when : when : If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

4. The construction method of the water-stopping structure for expansion joints in hydraulic tunnels as described in claim 3, characterized in that, The steps for "verifying the maximum compression of the elastic rubber sealing rod at the highest water temperature" include: The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: Calculate the temperature difference between the highest water temperature and the circulating water temperature. : In the formula, This is the highest water temperature; Calculate the deformation of the expansion joint : Calculate the expansion of the elastic rubber sealing rod due to temperature rise. : Calculate the maximum compression of the rubber rod: If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

5. The construction method of the water-stopping structure for expansion joints in hydraulic tunnels as described in claim 4, characterized in that, The steps for "verifying the radius and maximum compression of the elastic rubber sealing rod at the lowest water temperature" include: The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: Calculate the temperature difference between the initial water temperature and the lowest water temperature. : In the formula, The lowest water temperature; Calculate the deformation of the expansion joint : Calculate the shrinkage of the elastic rubber sealing rod due to temperature decrease. : The radius of the elastic rubber sealing rod is verified using the method shown in the following formula: In the formula, The width of the expansion joint of the elastic rubber sealing rod If the inequality holds, then the radius of the elastic rubber sealing rod is considered to meet the requirements. The maximum compression of the elastic rubber sealing rod is verified using the method shown in the following formula: If the maximum compression of the elastic rubber sealing rod is greater than If the maximum compression of the elastic rubber sealing rod is satisfied, then it is considered that the requirement is met.

6. The construction method of the water-stopping structure for expansion joints in hydraulic tunnels as described in claim 5, characterized in that, The width of the expansion joint of the elastic rubber sealing rod As shown in the following formula: 。

Images