A device and method for adapting to large deformation of asphalt core wall contact surface shear

Abstract

The application discloses a device and method suitable for shearing large deformation of asphalt core wall contact surface, which comprises a metal template, high-temperature resistant heat-conducting oil, a heating pipe, a water pipe and a bolt connecting piece. The internal structure of the device can be divided into a heat insulation layer, a cooling layer and a heating layer, and is wrapped by the metal template. The cooling layer is uniformly arranged with the cooling water pipe. After the heating work of the heating layer is completed and the asphalt is redistributed, the heating layer and the asphalt core wall joint section are quickly lowered to the ambient temperature. The application can be combined with dam body height segmentation prefabrication, and is connected by the bolt connecting piece in engineering site. The heating pipe and the water pipe between the segments are connected through external pipes. The application can realize self-adaptive shearing large deformation of the asphalt core wall contact surface of the asphalt core wall dam in the whole life cycle, improve the dam service life and ensure the engineering safety.

Description

Technical Field

[0001] This invention belongs to the field of asphalt concrete core wall technology, and more specifically, relates to a device and method for adapting to large shear deformation of the contact surface of asphalt core wall. Background Technology

[0002] The use of asphalt concrete for seepage control in earth-rock dams began in the early 20th century. Statistics show that over 500 dams currently use asphalt concrete as their seepage control structure. As of 2019, there were 217 asphalt concrete core dams built worldwide, 119 of which are in China, including 15 dams with a height of over 100 meters. The world's first asphalt concrete core dam was the Vale de Caio Dam in Portugal, with a height of 45 meters. Representative asphalt concrete core dams built in China in recent years include the Sichuan Yele Asphalt Concrete Core Rockfill Dam (124.5 meters high, completed in 2006) and the Sichuan Quxue Asphalt Concrete Core Rockfill Dam (164.2 meters high, completed in 2019).

[0003] The reason why asphalt concrete core wall dams can be widely used is because they have the following advantages: (1) The construction period of asphalt concrete is less affected by rainfall and low temperature. When it is difficult to use traditional seepage prevention bodies in rainy and cold regions, the use of asphalt concrete core walls can ensure construction quality and progress at the same time; (2) Engineering practice shows that asphalt concrete has strong adaptability to dam body and foundation deformation; (3) Asphalt concrete core walls have good seepage prevention performance, and their permeability coefficient can reach 10. -8 ~10 -10 cm / s; (4) Asphalt concrete core wall has good seismic performance. Studies have shown that cyclic load has very little effect on the stress-strain-strength performance and impermeability of asphalt concrete. In addition, the total strain of asphalt concrete core wall under the same dynamic stress cycle and the same number of times of action is an order of magnitude smaller than that of riprap.

[0004] However, asphalt concrete core dams also have weak points, which, if not properly addressed, can pose significant safety hazards. Generally, as a type of earth-rock dam, asphalt concrete core dams experience substantial vertical and horizontal displacement during construction and early operation. The cumulative vertical displacement can typically reach around 50 cm, and for dams built on deep overburden layers, the vertical displacement can be even greater. This leads to significant shear deformation at the interface between the asphalt concrete core and the slope, potentially causing misalignment between the core and the slope, and even cracks within the core, ultimately resulting in the failure of the dam's seepage prevention structure and jeopardizing the overall safety of the project.

[0005] This invention addresses the engineering challenge of large shear deformation at the contact surface between the asphalt concrete core wall and the slope by proposing a device and method to accommodate such deformation. When a settlement monitoring instrument detects significant shear deformation between the asphalt concrete core wall and the slope, the heating layer is activated to heat the asphalt concrete, restoring it to a plastic flow state. This automatically fills the gaps between the asphalt concrete core wall and the slope, enabling self-healing of cracks and ensuring a consistently good fit between the asphalt concrete core wall and the slope. Summary of the Invention

[0006] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention proposes a device and installation method for adapting to large shear deformation of the contact surface of asphalt core wall.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A device and method for adapting to large shear deformation of the contact surface of an asphalt core wall, the device comprising: a metal template, heat insulation material, high-temperature heat transfer oil, a heating pipe, a water pipe, bolted connectors, and a settlement monitoring instrument.

[0008] The metal formwork is set at the connection between the concrete base of the slope and the asphalt concrete core wall. The outer side of the metal formwork is fixed to the concrete base of the slope by welded anchor bars, while the inner side of the metal formwork wraps around the asphalt mastic part at the end of the asphalt core wall. The interior of the metal formwork is divided into an insulation layer, a heating layer, and a cooling layer. The heating layer is located near the end of the asphalt core wall, the insulation layer is located near the concrete base of the slope, and the cooling layer is located between the heating layer and the insulation layer. A settlement monitoring instrument is installed at the joint between the slope and the asphalt core wall. The instrument can issue warning information based on the relative deformation of the asphalt core wall and the slope. The operator can control the working status of the device to ensure that the asphalt core wall and the slope are always in a tight bond.

[0009] Furthermore, the metal template can be divided into several sections according to the height of the dam body, preferably 5m sections, and prefabricated before the dam construction. During construction, the sections are connected one by one as the asphalt core wall construction progresses.

[0010] Furthermore, the heating layer is supported by metal ribs to prevent significant deformation of the heating layer.

[0011] Furthermore, multiple rows of U-shaped heat-conducting pipes are evenly arranged inside the heating layer, and the heating layer cavity is encapsulated with high-temperature heat-conducting oil to facilitate uniform heating of the asphalt core wall joint.

[0012] Furthermore, the heating layer must ensure that the end of the asphalt core wall can be heated to between 150 and 180 degrees Celsius during operation, so as to ensure that the asphalt core wall can be heated to a plastic flow state without causing destructive effects on the performance of the asphalt core wall.

[0013] Furthermore, multiple rows of U-shaped cooling water pipes are evenly arranged inside the cooling layer, which are filled with cold water. This is used to quickly cool down the asphalt core wall end after it returns to a plastic flow state and redistributes under the action of the heating layer, so that the asphalt can return to a solid state. In addition, it can also ensure that the concrete base of the outer slope is always in a state where the temperature difference with the ambient temperature is not significant.

[0014] Furthermore, the U-shaped cooling water pipes and U-shaped heat conduction pipes need to be interconnected between the sections of the metal template.

[0015] Furthermore, the insulation layer needs to be made of insulation material, mainly to ensure that the concrete core wall cover plate is not affected by the high temperature state when the heating layer is working.

[0016] Furthermore, the bolted connectors are used to connect the metal template segments to ensure a tight fit between the joints of the segments.

[0017] The beneficial effects of this invention are: The above-mentioned device and method conceived by the present invention have the following advantages: (1) The structure is simple, modularly manufactured, and the cost is low; (2) It can be prefabricated in the factory before the dam construction and modularly installed on the construction site, which is relatively simple; (3) It can monitor the relative displacement between the slope and the core wall in real time and issue warning information to the staff in a timely manner; (4) When the asphalt core wall has large shear deformation, it can improve the temperature of the end of the asphalt core wall and improve its plasticity by precise temperature control, thereby adaptively filling the space of the slope and the self-healing cracks; (5) By setting a cooling layer and a heat insulation layer, it can ensure that the concrete base of the slope is maintained at the ambient temperature when the device is heated, thus avoiding the generation of temperature cracks; (6) After the asphalt core wall is redistributed, the device and core wall temperature can be quickly reduced to the ambient temperature by the cooling layer, so that the asphalt can be restored to a solid stable state as soon as possible. Attached Figure Description

[0018] Figure 1 This is a top cross-sectional view of the device of the present invention; Figure 2 This is a front view of the nth segment and the (n-1)th and (n+1)th segments of the metal template of the device of the present invention; Figure 3 This is a rear view of the nth and (n-1)th and (n+1)th segments of the metal template of the device of the present invention; Figure 4 This is a left view of the nth segment and the (n-1)th and (n+1)th segments of the metal template of the device of the present invention; Figure 5 This is a right view of the nth segment and the (n-1)th and (n+1)th segments of the metal template of the device of the present invention.

[0019] In the diagram, 1 represents the end of the asphalt core wall; 21 represents the connection between the heating pipes of the nth and (n-1th)th sections of the metal formwork; 22 represents the connection between the heating pipes of the nth and (n+1th)th sections of the metal formwork; 31 represents the connection between the cold water pipes of the nth and (n-1th)th sections of the metal formwork; 32 represents the connection between the cooling water pipes of the nth and (n+1th)th sections of the metal formwork; 41 and 42 represent the bolted connections between the nth and (n-1th)th sections of the metal formwork; 43 and 44 represent the bolted connections between the nth and (n+1th)th sections of the metal formwork; 51 and 52 represent the connection seams between the nth and (n-1th)th sections and between the nth and (n+1th)th sections of the metal formwork; 6 represents the U-shaped cooling water pipe; 7 represents the U-shaped heat-conducting pipe; 8 represents the metal rib; 9 represents the high-temperature heat-conducting oil; 10 represents the inner metal plate of the formwork; 11 represents the heating layer; 12 represents the cooling layer; 13 represents the heat insulation layer; 14 represents the outer metal plate of the formwork; 15 represents the concrete base; and 16 represents the asphalt concrete core wall. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figures 1 to 5 As shown, a device for adapting to large shear deformation of the contact surface of an asphalt core wall includes an asphalt core wall end 1, a heating pipe connection section 21 between the nth and (n-1th)th sections of the metal template, a heating pipe connection section 22 between the nth and (n+1th)th sections of the metal template, a cooling water pipe connection section 31 between the nth and (n-1th)th sections of the metal template, a cooling water pipe connection section 32 between the nth and (n+1th)th sections of the metal template, bolted connectors 41 and 42 between the nth and (n-1th)th sections of the metal template, bolted connectors 43 and 44 between the nth and (n+1th)th sections of the metal template, a joint 51 between the nth and (n-1th)th sections of the metal template, a connecting joint 52 between the nth and (n+1th)th sections of the metal template, a U-shaped cooling water pipe 6, a U-shaped heat-conducting pipe 7, a metal rib 8, high-temperature heat-conducting oil 9, an inner metal plate 10 of the template, a heating layer 11, a cooling layer 12, a heat insulation layer 13, an outer metal plate 14 of the template, a concrete base 15, and an asphalt concrete core wall 16.

[0022] The metal formwork is set at the connection between the slope concrete base 15 and the asphalt concrete core wall 16, and the outer metal plate 14 of the formwork is fixed to the slope concrete base 15 by welding anchor bars, while the inner metal plate 10 of the formwork wraps around the end 1 of the asphalt core wall. The interior of the metal template is divided into an insulation layer 13, a cooling layer 12 and a heating layer 11. The heating layer 11 is close to the end 1 side of the asphalt core wall, the insulation layer 13 is close to the asphalt concrete core wall 16 side of the slope, and the cooling layer 12 is located between the heating layer 11 and the insulation layer 13. A settlement monitoring instrument is installed at the end of the asphalt core wall 15 and the slope concrete base 15. The instrument can issue warning information based on the relative deformation of the asphalt concrete core wall 16 and the slope concrete base 15 as observed by the settlement monitoring instrument. The operator can control the working status of the device to ensure that the asphalt concrete core wall 16 and the slope concrete base 15 are always in a tight bond.

[0023] In this embodiment, the metal template can be divided into several sections according to the height of the dam body, preferably 5m each, and prefabricated before the dam construction. During construction, the sections are connected one by one as the asphalt core wall construction progresses.

[0024] In this embodiment, the heating layer 11 is supported by metal ribs 8 to prevent the heating layer from undergoing large deformation.

[0025] In this embodiment, multiple rows of U-shaped heat-conducting pipes 7 are evenly arranged inside the heating layer 11, and high-temperature heat-conducting oil 9 is encapsulated in the heating layer cavity to facilitate uniform heating of the asphalt core wall end 1.

[0026] In this embodiment, the heating layer 11 must ensure that the end of the asphalt core wall 1 can be heated to between 150 and 180 degrees Celsius during operation, so as to ensure that the asphalt core wall can be heated to a plastic flow state without causing destructive effects on the performance of the asphalt core wall.

[0027] In this embodiment, multiple rows of U-shaped cooling water pipes 6 are evenly arranged inside the cooling layer, and cold water is circulated inside. This is used to quickly cool down the asphalt core wall end 1 after the plasticity is improved and redistributed under the action of the heating layer, so that the asphalt can return to a solid state. In addition, it can also ensure that the outer concrete cover plate is always in a state where the temperature difference with the ambient temperature is not significant.

[0028] In this embodiment, the U-shaped cooling water pipe 6 and the U-shaped heat conduction pipe 7 need to be interconnected between the segments of the metal template. The U-shaped cooling water pipe 6 leads out the cooling water pipe connection 31 between the nth and (n-1)th segments of the metal template and the cooling water pipe connection 32 between the nth and (n+1)th segments of the metal template on the side of the nth segment of the template, respectively, and connects to its upper and lower segments. The U-shaped heat conduction pipe 7 leads out the heating pipe connection segment 21 between the nth and (n-1)th segments of the metal template and the heating pipe connection segment 22 between the nth and (n+1)th segments of the metal template on the side of the nth segment of the template, respectively, and connects to its upper and lower segments.

[0029] In this embodiment, the heat insulation layer 13 needs to be made of heat insulation material, mainly to ensure that the concrete base 15 is not affected by the high temperature state when the heating layer 11 is working.

[0030] In this embodiment, the bolted connectors 41 and 42 between the nth and (n-1)th segments of the metal template and the bolted connectors 43 and 44 between the nth and (n+1)th segments of the metal template are used to connect the segments of the metal template, ensuring that the joint 51 between the nth and (n-1)th segments of the metal template and the joint 52 between the nth and (n+1)th segments of the metal template fit tightly together.

[0031] In this embodiment, the installation method of the device adapted to the large shear deformation of the asphalt core wall contact surface is as follows: S1: The slope is poured with concrete base 15. A settlement monitoring instrument is installed inside the concrete base 15 to monitor the deformation information of the concrete base 15. The installation position of the metal plate 14 on the outside of the template is reserved. S2: Install the outer metal plate 14 of the template, and apply or place heat insulation material inside the outer metal plate 14 of the template to form a heat insulation layer 13 to ensure that the outer concrete cover plate is always in a state where the temperature difference with the ambient temperature is not significant. S3: Install a metal plate between the heat insulation layer 13 and the cooling layer 12 to isolate the two areas; S4: Place the U-shaped cooling water pipe 6, and complete the connection of the joint sections between the sections on the side of the template, so that the U-shaped cooling water pipe 6 is connected as a whole; S5: Install bolted connectors between a pair of U-shaped cooling water pipes 6 between all sections of the cooling layer 12 to ensure that the joints between sections fit tightly. S6: Install a metal plate between the cooling layer 12 and the heating layer 11 to isolate the two areas; S7: Place the U-shaped heat pipe 7, and connect the joint sections between the segments on the side of the template to make the U-shaped heat pipe 7 connected as a whole; S8: Install bolt connectors between a pair of U-shaped heat pipes 7 between all sections of the heating layer 11 to ensure that the joints between the sections fit tightly. S9: Install metal ribs 8 inside the heating layer 11 to prevent large deformation of the heating layer; S10: Install the inner metal plate 10 of the template to make the heating layer form a container ready to pour in high-temperature heat transfer oil; S11: Pour high-temperature heat-conducting oil 9 into the heating layer 11, which can be heated to between 150 degrees Celsius and 180 degrees Celsius to ensure that the asphalt core wall can be heated to a plastic flow state without causing destructive effects on the performance of the asphalt core wall. S12: Use U-shaped heat pipe 7 for heating, and test the heating effect and the connectivity of U-shaped heat pipe 7; S13: Use U-shaped cooling water pipe 6 for cooling, and test the cooling effect and the connectivity of U-shaped cooling water pipe 6; S14: When pouring the asphalt core wall at end 1, install a settlement monitoring instrument inside it to monitor deformation information.

[0032] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of steps / components can be combined into new steps / components to achieve the purpose of this invention. Those skilled in the art will readily understand that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A device for adapting to large shear deformation of the contact surface of an asphalt core wall, comprising a concrete base (15), an asphalt concrete core wall (16), and an end of the asphalt core wall (1), characterized in that, A metal template is provided at the connection between the concrete base (15) and the asphalt concrete core wall (16) and the end (1) of the asphalt core wall. The metal template includes a heat insulation layer (13), a heating layer (11) and a cooling layer (12). The heat insulation layer (13) is close to the concrete base (15), the cooling layer (12) is close to the asphalt concrete core wall (16) and the end (1) of the asphalt core wall, and the heating layer (11) is disposed between the heat insulation layer (13) and the cooling layer (12). Heating pipes are arranged in the heating layer (11), and the cavity of the heating layer (11) is filled with high-temperature heat-conducting oil (9). Water pipes are arranged in the cooling layer (12). A settlement monitoring instrument is installed inside the concrete base (15).

2. The device for adapting to large shear deformation of the contact surface of the asphalt core wall as described in claim 1, wherein the metal template includes an outer metal plate (14) and an inner metal plate (10), the outer metal plate (14) is fixed to the concrete base (15) by welding anchor bars, and the inner metal plate (10) wraps around the end (1) of the asphalt core wall.

3. The device for adapting to large shear deformation of the contact surface of asphalt core wall as described in claim 1, wherein the heating layer (11) is provided with metal ribs (8).

4. The device for adapting to large shear deformation of the contact surface of asphalt core wall as described in claim 1, wherein multiple rows of U-shaped heat conduction pipes (7) are uniformly arranged inside the heating layer (11), and multiple rows of U-shaped cooling water pipes (6) are uniformly arranged inside the cooling layer (12).

5. The device for adapting to large shear deformation of the contact surface of asphalt core wall as described in claim 4, wherein the U-shaped cooling water pipe (6) and the U-shaped heat conduction pipe (7) are interconnected between the sections of the metal template.

6. The device for adapting to large shear deformation of the contact surface of the asphalt core wall as described in claim 1, wherein the metal template is divided into several sections according to the height of the dam body.

7. The device for adapting to large shear deformation of the contact surface of asphalt core wall as described in claim 6, wherein the metal template segments are connected by bolted connectors.

8. The device for adapting to large shear deformation of the contact surface of asphalt core wall as described in claim 6, wherein each pair of water pipes between sections is fixed with bolted connectors, and each pair of heating pipes is fixed with bolted connectors.

9. A method for installing the large shear deformation device for the contact surface of an asphalt core wall as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Slope pouring concrete base (15), the concrete base (15) is equipped with a settlement observation instrument to observe the deformation information of the concrete base (15), and the installation position of the metal plate (14) on the outside of the template is reserved. S2: Install the outer metal plate (14) of the template, apply or place heat insulation material inside the outer metal plate (14) of the template to form a heat insulation layer (13) to ensure that the outer concrete cover plate is always in a state with little difference from the ambient temperature; S3: Install a metal plate between the heat insulation layer (13) and the cooling layer (12) to isolate the two areas; S4: Place the U-shaped cooling water pipe (6) and complete the connection of the joint section between the sections on the side of the template so that the U-shaped cooling water pipe (6) is connected as a whole; S5: Install bolted connectors between a pair of U-shaped cooling water pipes (6) between all sections of the cooling layer (12) to ensure that the joints between the sections are tightly fitted; S6: Install a metal plate between the cooling layer (12) and the heating layer (11) to isolate the two areas; S7: Place the U-shaped heat pipe (7) and complete the connection of the joint section between the segments on the side of the template so that the U-shaped heat pipe (7) is connected as a whole; S8: Install bolt connectors between a pair of U-shaped heat pipes (7) between all sections of the heating layer (11) to ensure that the joints between the sections are tightly fitted; S9: Install metal ribs (8) inside the heating layer (11) to avoid large deformation of the heating layer; S10: Install the inner metal plate (10) of the template to make the heating layer form a container ready to pour in high-temperature heat transfer oil; S11: Pour high-temperature heat-conducting oil (9) into the heating layer (11) and heat it to between 150 degrees Celsius and 180 degrees Celsius to ensure that the asphalt core wall can be heated to a plastic flow state without causing destructive effects on the performance of the asphalt core wall. S12: Use the U-shaped heat pipe (7) for heating, and test the heating effect and the connectivity of the U-shaped heat pipe (7); S13: Use the U-shaped cooling water pipe (6) to cool down, and test the cooling effect and the connectivity of the U-shaped cooling water pipe (6); S14: When pouring the asphalt core wall end (1), install a settlement monitoring instrument inside it to monitor deformation information.

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