Structure for promoting stress release of asphalt concrete core wall
By introducing temperature control components into the asphalt concrete core wall and utilizing the feedback system of temperature sensing unit and heating unit, the problem of tensile stress concentration caused by excessive deformation gradient was solved, thus achieving stability and crack resistance of the core wall.
Patent Information
- Application Number
- CN202423106553.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-16
AI Technical Summary
When constructing a high asphalt concrete core dam on a steep bank slope and a dam foundation with a thick overburden layer, the asphalt concrete core is prone to tensile stress concentration due to excessive deformation gradient, leading to cracking.
A temperature control component, including a temperature sensing unit and a heating unit, is used. These components are connected in parallel via wires to form a feedback system, which controls the temperature field of the asphalt concrete core wall and avoids excessive deformation gradients and stress concentrations caused by temperature changes.
Effectively control the temperature field of asphalt concrete core walls to prevent cracking and ensure their long-term performance and stability.
Smart Images
Figure CN223548520U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of asphalt concrete core wall technology, specifically to a structure that promotes stress release in asphalt concrete core walls. Background Technology
[0002] As the development of water conservancy and hydropower resources advances to the high mountain and canyon areas in the west, asphalt concrete core wall dams, with their advantages such as low requirements for the quality of riprap materials (allowing for local sourcing), strong adaptability to deformation of the seepage prevention body, avoidance of large-scale mining of farmland soil, and the core wall being located inside the dam body with less impact from cold and dry weather, are gradually becoming the most competitive dam type for dam construction under adverse conditions such as steep bank slopes, deep dam foundation overburden, and deep bank slope weathering layers.
[0003] However, when constructing high asphalt concrete core dams on steep slopes and dam foundations with thick overburden, the asphalt concrete core near the slope is prone to tensile stress concentration due to excessive deformation gradient, which can even lead to cracking. Currently, apart from increasing the asphalt content to improve the adaptability of asphalt concrete, there are no other good structural measures. Utility Model Content
[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a structure that promotes stress release in asphalt concrete core walls, thereby solving the technical problem in the field of asphalt concrete core wall technology that asphalt concrete core walls are prone to tensile stress concentration due to excessive deformation gradient, and even cracking as a result.
[0005] To achieve the above-mentioned technical objectives, the present invention provides a structure for promoting stress release in asphalt concrete core walls, comprising:
[0006] A temperature control assembly; multiple sets of the temperature control assemblies are connected in parallel via a first conductor; each temperature control assembly includes a temperature controller, a temperature sensing unit, and a temperature heating unit; the temperature sensing unit and the temperature heating unit are connected to the first conductor via a second conductor; a connector protective shell covers the connection point between the first conductor and the second conductor; the connector protective shell is fixed to the concrete dam body by a fixing bracket. The temperature sensing unit and the temperature heating unit are placed inside the asphalt concrete core wall; the temperature sensing unit is positioned above the temperature heating unit to detect the temperature inside the asphalt concrete core wall.
[0007] Compared with the prior art, the beneficial effects of this utility model include:
[0008] The structure provided by this utility model for promoting stress release in asphalt concrete core walls utilizes the temperature sensing unit, temperature heating unit, and temperature control feedback system to effectively control the temperature field of the asphalt concrete core wall, avoid excessive deformation gradient and stress concentration caused by temperature changes, thereby preventing cracking of the asphalt concrete core wall and ensuring its long-term performance and stability. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the application scenario of the structure provided by this utility model for promoting stress release in asphalt concrete core walls;
[0010] Figure 2 This is a schematic diagram of the installation of the temperature sensing unit and the temperature heating unit in the structure for promoting stress release of asphalt concrete core walls provided by this utility model.
[0011] Figure 3 This is a schematic diagram of the installation of the first and second conductors and the joint protective shell in the structure for promoting stress release in asphalt concrete core walls provided by this utility model;
[0012] Figure 4 This is a top view schematic diagram of the structure provided by this utility model for promoting stress release in asphalt concrete core walls. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0014] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0016] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This embodiment provides a structure that promotes stress release in asphalt concrete core walls, including: a temperature control component 1.
[0017] Furthermore, in this embodiment, resistance heating technology is mainly used to control the temperature gradient, thereby reducing stress caused by temperature changes.
[0018] Furthermore, and specifically, almost all materials expand or contract with temperature changes. For asphalt concrete, it expands when heated and contracts when cooled. If this expansion and contraction are constrained, stress may be generated within the material. If different parts of the core wall experience different temperature changes, the degree of expansion or contraction between the parts will differ, leading to a deformation gradient. An excessive deformation gradient can cause uneven stress distribution within the material, especially at joints or weaker areas, easily leading to tensile stress concentration and potentially causing cracks. By using heating resistors, the asphalt concrete core wall can be heated during construction or under specific conditions, making the temperature of the entire structure more uniform. This reduces the deformation gradient caused by temperature differences, thereby reducing internal stress caused by temperature changes. Heating also helps release residual stress already present in the core wall. During the heating process, the asphalt concrete becomes more plastic, allowing some of the original stress to be relieved and reducing the possibility of stress concentration during subsequent cooling.
[0019] Furthermore, multiple sets of temperature control components 1 are connected in parallel via the first wire 2. If one of the temperature control components 1 fails, the other temperature control components 1 can still continue to work, which improves the reliability and fault tolerance of the structure.
[0020] Furthermore, the temperature control component 1 includes a temperature controller 11, a temperature sensing unit 12, and a temperature heating unit 13. The temperature sensing unit 12 and the temperature heating unit 13 are connected to the first wire 2 via a second wire 3. The connection between the first wire 2 and the second wire 3 is covered with a connector protective shell 4. The connector protective shell 4 is fixed to the concrete dam body by a fixing bracket 5.
[0021] Furthermore, the connector protective shell 4 is made of stainless steel to protect the connection between the first wire 2 and the second wire 3 from damage, thereby improving the reliability of the structure.
[0022] Furthermore, both the temperature sensing unit 12 and the temperature heating unit 13 are arranged horizontally, and the temperature sensing unit 12 and the temperature heating unit 13 are located in the middle of the asphalt concrete core wall 6. The materials of the temperature sensing unit 12 and the temperature heating unit 13 are both selected from high-temperature resistant materials.
[0023] Furthermore, the temperature sensing unit 12 and the temperature heating unit 13 are placed inside the asphalt concrete core wall 6, with the temperature sensing unit 12 positioned above the temperature heating unit 13 to detect the temperature inside the asphalt concrete core wall 6.
[0024] Furthermore, preferably, the temperature sensing unit 12 is selected from a thermocouple or an RTD sensor, wherein the thermocouple or RTD sensor is resistant to 180 degrees.
[0025] Furthermore, preferably, the temperature heating unit 13 is a heating resistor. Resistors that meet the requirements of high temperature resistance, shell encapsulation material properties that are not too fragile and can withstand crushing, and easy temperature control can be used as heating resistors in this structure.
[0026] Furthermore, preferably, both the first conductor 2 and the second conductor 3 are made of Teflon high-temperature wire. In this embodiment, Teflon high-temperature wire has the following advantages: 1. Excellent heat resistance: Teflon can withstand extremely high temperatures, typically maintaining stable performance between -200°C and +260°C (-328°F to +500°F). Even after long-term exposure to high-temperature environments, Teflon will not undergo significant aging or performance degradation, ensuring long lifespan and reliability. 2. Excellent electrical insulation performance: Teflon has very high dielectric strength, providing excellent insulation protection under high-voltage conditions, reducing power loss and short-circuit risk, and minimizing signal transmission delay. 3. Chemical inertness: Teflon hardly reacts with any chemicals, including strong acids, strong alkalis, solvents, and other corrosive substances. Due to its chemical inertness, Teflon does not release harmful substances.
[0027] Furthermore, the first wire 2 is connected to the temperature controller 11, and the temperature sensing unit 12 and the temperature heating unit 13 are connected to the temperature controller 11 through the first wire 2 and the second wire 3.
[0028] Furthermore, the temperature controller 11 is a central processing unit, which may be a PLC, microcontroller, or dedicated temperature controller. The temperature controller 11 is mainly responsible for receiving sensor data, executing control algorithms, and outputting control signals.
[0029] Furthermore, the first conductor 2 and the connector protective shell 4 are placed inside the steel pipe, the length of which extends from the bottom asphalt concrete core wall 6 to the temperature controller 11 to protect the first conductor 2 and the second conductor 3 from damage.
[0030] Furthermore, the asphalt concrete core wall 6 is constructed in layers. The thickness of the bottom layer of the asphalt concrete core wall 6 is 1 / 50 of the dam height, and the minimum thickness of the top layer of the asphalt concrete core wall 6 is 30cm. The end face of the asphalt concrete core wall 6 is trapezoidal, and the two sides of the asphalt concrete core wall 6 are crushed stone transition layers 7.
[0031] Working Principle: The structure for promoting stress release in asphalt concrete core walls provided by this utility model includes a temperature control component 1. Multiple sets of the temperature control components 11 are connected in parallel via a first conductor 2. The temperature control component 1 includes a temperature controller 11, a temperature sensing unit 12, and a temperature heating unit 13. The temperature sensing unit 12 and the temperature heating unit 13 are connected to the first conductor 2 via a second conductor 3. A joint protective shell 4 covers the connection between the first conductor 2 and the second conductor 3. The joint protective shell 4 is fixed to the concrete dam body by a fixing bracket 5. The temperature sensing unit 12 and the temperature heating unit 13 are placed inside the asphalt concrete core wall 6. The temperature sensing unit 12 is positioned above the temperature heating unit 13 to detect the temperature inside the asphalt concrete core wall 6.
[0032] Specifically, in this embodiment, a feedback-based control system ensures that the material remains within a suitable operating temperature range during construction or maintenance, thereby preventing material hardening, stress concentration, or cracking caused by low temperatures. The following are detailed application examples, along with the control methods and related algorithms used.
[0033] First, the staff inputs the desired temperature setpoint through the user interface of the temperature controller 6. After starting the entire structure, the temperature sensing unit 12 begins to collect temperature data of the asphalt concrete core wall 6. The temperature controller 6 enters standby mode to receive and process data. The temperature sensing unit 12 measures the temperature at regular intervals and sends the data to the temperature controller 11. Since each layer of the asphalt concrete core wall 6 is equipped with the temperature sensing unit 12, a three-dimensional temperature monitoring network is formed.
[0034] Secondly, after receiving the data from each of the temperature sensing units 12, the temperature controller 11 compares it with the set point and calculates the temperature deviation at each location. If the temperature at a certain location is lower than the set point, the temperature controller 11 will decide to activate the corresponding temperature heating unit 13.
[0035] Finally, when the temperature controller 11 decides to heat the asphalt concrete core wall 6, it sends a signal to the corresponding temperature heating unit 13 to start working. Simultaneously, based on the results calculated by the PID algorithm, the temperature controller 11 can dynamically adjust the power of the temperature heating unit 13 to achieve precise temperature control. During the heating process, the temperature sensing unit 12 continues to monitor temperature changes in real time and feeds the latest data back to the controller. The temperature controller 11 continuously adjusts the heating strategy based on the new temperature information to ensure that the temperature remains stable near the set point. Once the temperature reaches or exceeds the set point, the temperature controller 11 will immediately stop heating to avoid overheating and damage to the asphalt concrete core wall 6.
[0036] This involves control algorithms, specifically PID control. Proportional (P) control directly adjusts the heating power based on the current error magnitude. The proportional gain (Kp) determines the strength of the response; a larger Kp leads to a faster but potentially unstable response. Integral (I) control accumulates past errors, helping to eliminate static errors and bringing the temperature closer to the setpoint. The integral time constant (Ti) affects the speed of the integral action. Derivative (D) control considers the rate of change of the error, predicting future trends to reduce overshoot and oscillations. The derivative time constant (Td) determines the sensitivity of the derivative action. The PID control formula is as follows: [Formula omitted for brevity].
[0037]
[0038] Where u(t) is the output signal of the temperature controller, e(t) is the error, and K p K i and K d These are proportional, integral, and differential gains, respectively.
[0039] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A structure for promoting stress release in asphalt concrete core walls, applied in multi-layer asphalt concrete core walls, characterized in that, include: Temperature control components; multiple sets of the temperature control components are connected in parallel via a first wire; the temperature control components include a temperature controller, a temperature sensing unit, and a temperature heating unit; the temperature sensing unit and the temperature heating unit are connected to the first wire via a second wire; the connection between the first wire and the second wire is covered with a connector protective shell; the connector protective shell is fixed to the concrete dam body by a fixing bracket.
2. The structure for promoting stress release in asphalt concrete core walls according to claim 1, characterized in that, The temperature sensing unit and the temperature heating unit are placed inside the asphalt concrete core wall; the temperature sensing unit is placed above the temperature heating unit to detect the temperature inside the asphalt concrete core wall.
3. The structure for promoting stress release in asphalt concrete core walls according to claim 1, characterized in that, Both the temperature sensing unit and the temperature heating unit are arranged horizontally; the temperature sensing unit and the temperature heating unit are located in the middle of the asphalt concrete core wall; the materials of both the temperature sensing unit and the temperature heating unit are high-temperature resistant materials.
4. The structure for promoting stress release in asphalt concrete core walls according to claim 1, characterized in that, The first wire is connected to the temperature controller; the temperature sensing unit and the temperature heating unit are connected to the temperature controller through the first wire and the second wire.
5. The structure for promoting stress release in asphalt concrete core walls according to claim 1, characterized in that, It also includes a steel pipe; the first conductor and the joint protective shell are placed inside the steel pipe; the length of the steel pipe extends from the bottom layer of the asphalt concrete core wall to the temperature controller.
6. The structure for promoting stress release in asphalt concrete core walls according to claim 1, characterized in that, The asphalt concrete core wall is constructed in layers; the thickness of the bottom layer of the asphalt concrete core wall is 1 / 50 of the dam height; the minimum thickness of the top layer of the asphalt concrete core wall is 30cm; the end face of the asphalt concrete core wall is trapezoidal; and the two sides of the asphalt concrete core wall are gravel transition layers.