A cofferdam structure and cofferdam construction system for deep mountain canyon areas

Abstract

This utility model discloses a cofferdam structure and construction system for deep mountain canyon areas. The cofferdam structure includes a cofferdam body located between a diversion tunnel and a tailrace tunnel. The cofferdam body is curved and serves to separate the diversion tunnel and the tailrace tunnel. The cofferdam construction system includes the aforementioned cofferdam structure for deep mountain canyon areas. Considering the complex and varied terrain of the construction environment and the layout of the structures, the curved cofferdam body overcomes the constraints and limitations caused by a single directional axis, improving the adaptability and flexibility of the design and enabling it to better adapt to complex environments. Furthermore, the curved cofferdam body also enhances the smoothness and stability of the cofferdam structure, contributing to improved performance and safety in use.

Description

Technical Field

[0001] This utility model relates to the field of cofferdam technology, specifically to a cofferdam structure and cofferdam construction system in deep mountain canyon areas. Background Technology

[0002] Cofferdams are a common type of temporary hydraulic structure in the field of water conservancy and hydropower engineering construction. They are designed to provide a waterless or still water environment for the construction of hydraulic structures. Among the many types of cofferdams, earth-rock cofferdams are the most widely used due to their advantages such as readily available materials, simple construction, strong adaptability, and low cost.

[0003] When constructing in deep mountain canyons, the extremely limited space for the layout of the key structures poses a significant challenge to the design of the diversion system. The rationality of the structural layout of the diversion structures becomes the top priority of the project, and the structural layout design of the cofferdam is a crucial link.

[0004] Therefore, how to reasonably adjust and optimize the structural layout design of downstream cofferdams in deep mountain valleys and under extremely congested downstream space of water conservancy and hydropower projects has become a pressing problem that needs to be solved in the field of water conservancy and hydropower construction. Utility Model Content

[0005] The technical problem to be solved by this utility model is to optimize the layout design of cofferdam structures to better adapt to construction in deep mountain and canyon areas. The purpose is to provide a cofferdam structure and cofferdam construction system for deep mountain and canyon areas to solve the above-mentioned problems.

[0006] This utility model is achieved through the following technical solution:

[0007] In the first aspect, this utility model provides a cofferdam structure for a deep mountain canyon area, including a cofferdam body located between a diversion tunnel and a tailrace tunnel. The cofferdam body is curved and is used to separate the diversion tunnel and the tailrace tunnel.

[0008] In one possible design, the cofferdam body has a crest axis, which includes a central axis and two shoulder axes;

[0009] The two ends of the central axis are connected to the axis of the weir shoulder through transition arc segments, so that the cofferdam body is curved.

[0010] The weir shoulder axis is connected to the base.

[0011] In one possible design, the central axis is nearly parallel to the axis of the diversion tunnel and nearly orthogonal to the axis of the tailrace tunnel; the axis of the weir shoulder is nearly perpendicular to the foundation.

[0012] In one possible design, the angle between the central axis and the weir shoulder axis is 120°±5°, the angle with the diversion tunnel axis is 0°-5°, the angle with the tailrace tunnel axis is 90°±5°, and the angle with the river channel is 20°-30°. Accordingly, the cofferdam body is set in the river channel.

[0013] In one possible design, the angle between the weir shoulder axis and the base is 90°±10°.

[0014] In one possible design, the radius of the transition arc segment is 2-3 times the width of the weir crest, and the wrap angle is 55°-65°.

[0015] In one possible design, the cofferdam body is an earth-rock cofferdam, with a crest width of not less than 3m and a crest elevation of the design flood level plus the safety freeboard, where the safety freeboard is 0.5-1.5m.

[0016] In one possible design, the slope ratio of the upstream side of the cofferdam is 1:2.0-1:3.0, and the slope ratio of the downstream side is 1:1.5-1:2.0.

[0017] In one possible design, the seepage prevention of the cofferdam body is a geomembrane core wall plus a concrete seepage barrier wall.

[0018] Secondly, this utility model provides a cofferdam construction system, including the aforementioned cofferdam structure in the deep mountain canyon area.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0020] Given the complex and varied terrain of the construction environment and the layout of the structures, the cofferdam body is designed with a curved shape. This overcomes the constraints and limitations caused by a single directional axis, improving the adaptability and flexibility of the design and enabling it to better adapt to complex environments. Furthermore, the curved shape of the cofferdam body enhances its smoothness and stability, contributing to improved performance and operational safety.

[0021] The cofferdam structure in the deep mountain canyon area can better coordinate the spatial relationship between hydraulic engineering structures, and can make the hydraulic conditions for construction diversion more ideal. At the same time, the cofferdam structure is stable and smooth, and has good applicability and superiority under specific conditions. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of a cofferdam structure in a deep mountain canyon area.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1. Diversion tunnel; 2. Tailrace tunnel; 3. Cofferdam body; 4. Central axis; 5. Abutment axis. Detailed Implementation

[0026] 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 embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0028] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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, they should not be construed as limiting the scope of protection of this utility model.

[0030] Example:

[0031] like Figure 1 As shown, in the first aspect, the present invention provides a cofferdam structure for a deep mountain canyon area, including a cofferdam body 3 located between a diversion tunnel 1 and a tailrace tunnel 2. The cofferdam body 3 is curved and is used to separate the diversion tunnel 1 and the tailrace tunnel 2.

[0032] When constructing in deep mountain canyon areas, the cofferdam body 3 is positioned between the diversion tunnel 1 and the tailrace tunnel 2 to ensure the normal outflow of the diversion tunnel 1 and prevent the construction of the cofferdam body 3 from affecting the normal operation of the diversion tunnel 1. The cofferdam body 3 serves to impede water flow, providing a dry or still water environment for the tailrace tunnel 2 and its upstream hydraulic structures, meeting the environmental requirements for related construction. Simultaneously, the separation provided by the cofferdam body 3 helps to coordinate spatial relationships, minimize interference between structures, purify the construction space, and improve construction efficiency.

[0033] For the cofferdam body 3, considering the complex and varied terrain of the construction environment and the layout of the structures, the cofferdam body 3 is constructed in a curved shape. This overcomes the constraints and limitations caused by a single directional axis, improves the adaptability and flexibility of the design, and allows it to better adapt to complex environments. In addition, the curved shape of the cofferdam body 3 also enhances the smoothness and stability of the cofferdam structure, which helps to improve the performance and safety of the cofferdam body 3 in use.

[0034] In one possible implementation, the cofferdam body 3 has a crest axis, which includes a central axis 4 and two shoulder axes 5;

[0035] The two ends of the central axis 4 are connected to the shoulder axis 5 through transition arc segments, so that the cofferdam body 3 is curved.

[0036] The weir shoulder axis 5 connects to the base.

[0037] Based on the above design scheme, the crest axis of the cofferdam body 3 is divided into three sub-segments: a central axis 4 and two abutment axes 5. The central axis 4 and the abutment axes 5 are connected by a transition arc segment. For example, see... Figure 1 Two weir shoulder axes 5 are provided, located at both ends of the central axis 4, namely, a left weir shoulder axis and a right weir shoulder axis at the left and right ends of the central axis 4, respectively. Furthermore, based on the site topography and building layout, the positional relationships between the three sub-segments are coordinated, and the layout of the cofferdam structure is adjusted and optimized in a more diverse manner to improve the adaptability and systematic nature of the spatial relationship arrangement between on-site buildings.

[0038] In addition, the overall shape of the cofferdam body 3 is curved, which to some extent avoids structural abrupt changes that may affect construction and hydraulic conditions, improves the flow pattern, and optimizes hydraulic conditions.

[0039] In one possible implementation, the central axis 4 is nearly parallel to the axis of the diversion tunnel 1 and nearly orthogonal to the axis of the tailrace tunnel 2; the abutment axis 5 is nearly perpendicular to the foundation. Based on the above design scheme, by restricting the positions of the three sub-segments, the spatial interaction between the cofferdam's land occupation, the tailrace tunnel 2, and the construction site of the diversion tunnel 1 is better coordinated, reducing the spatial constraints between the various structures.

[0040] Based on this, the cofferdam structure in the deep mountain canyon area achieves spatial coordination, avoiding both interference with and restriction of the normal outflow of the diversion tunnel 1, and providing a favorable construction environment with no water or still water for the tailrace tunnel 2 and its upstream hydraulic structures. This improves the spatial coordination among the diversion tunnel 1, the tailrace tunnel 2, and the cofferdam body 3.

[0041] Furthermore, by designing the positional relationship of the central axis 4, hydraulic conditions are improved and optimized. Specifically, the central axis 4 is nearly parallel to the axis of the diversion tunnel 1, which can significantly reduce the scouring impact of the outflow from the diversion tunnel 1 on the cofferdam toe, ensuring the long-term stability of the cofferdam's operation. The central axis 4 is nearly orthogonal to the axis of the tailrace tunnel 2, which can better coordinate the spatial interaction between the cofferdam's land occupation and the tailrace tunnel 2 construction site.

[0042] Optionally, the angle between the central axis 4 and the weir shoulder axis 5 is 120°±5°, the angle with the axis of the diversion tunnel 1 is 0°-5°, the angle with the axis of the tailrace tunnel 2 is 90°±5°, and the angle with the river channel is 20°-30°. Correspondingly, the cofferdam body 3 is set in the river channel. Based on this, those skilled in the art can select a specific value within the listed range for specific construction conditions.

[0043] For the transition arc section, the angle between the central axis 4 and the weir shoulder axis 5 is 120°±5°, which can largely avoid the deformation of the weir slope caused by the bending of the axis, and ensure the smoothness of the weir axis and the smoothness of the structure.

[0044] For the river channel, the angle between the central axis 4 and the river channel is 20°-30°, which can reduce the scouring effect of the water flow on the weir surface to a certain extent and slow down the wear and aging of the cofferdam.

[0045] The abutment axis 5 is nearly perpendicular to the base, which can effectively control the sliding tendency of the cofferdam when subjected to external forces. At the same time, it helps to make the center of gravity distribution of the cofferdam more reasonable, reducing the risk of overturning caused by uneven force. In short, it better ensures the anti-sliding and anti-overturning stability of the cofferdam and improves the stability of the cofferdam structure.

[0046] Optionally, the angle between the weir abutment axis 5 and the base is 90°±10°. Based on this, those skilled in the art can select a specific value from the listed range for specific construction conditions.

[0047] In one possible implementation, the radius of the transition arc segment is 2-3 times the width of the weir crest, and the wrap angle is 55°-65°. Based on the above design scheme, the transition arc segment is used to achieve a smooth connection between the central axis 4 and the weir shoulder axis 5, so as to better ensure the continuity and smoothness of the cofferdam structure layout, avoid structural abrupt changes that affect construction and hydraulic conditions, improve the flow pattern, stabilize the cofferdam structure, and extend the service life of the cofferdam.

[0048] In one possible implementation, the cofferdam body 3 is an earth-rock cofferdam, the crest width of the cofferdam body 3 is not less than 3m, and the crest elevation is the design flood level plus the safety freeboard, with the safety freeboard being 0.5-1.5m.

[0049] In one possible implementation, the slope ratio of the upstream side of the cofferdam body 3 is 1:2.0-1:3.0, and the slope ratio of the downstream side is 1:1.5-1:2.0.

[0050] In one possible implementation, the seepage prevention of the cofferdam body 3 is a geomembrane core wall plus a concrete seepage prevention wall.

[0051] Based on the above design scheme, for cofferdam body 3, an earth-rock cofferdam is selected. This reduces material costs, simplifies construction processes, and enhances design flexibility due to its strong adaptability. As for parameters such as cofferdam crest width, height, slope ratio, and seepage prevention methods, these can be selected by referring to the given parameter range, or determined based on actual site conditions, specifications, experience, and comprehensive factors such as structural stability, construction convenience, and project benefits.

[0052] Secondly, this utility model provides a cofferdam construction system, including the aforementioned cofferdam structure in deep mountain canyons. It is readily understood that, based on the aforementioned cofferdam structure in deep mountain canyons, the cofferdam construction system can also include any other suitable functional modules, resulting in richer functionality to meet different work requirements and improved practicality. Furthermore, it is readily understood that the functional modules can be selected from any suitable existing equipment, offering a wide range of choices.

[0053] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cofferdam structure for deep mountain canyons, characterized in that, It includes a cofferdam body (3) located between the diversion tunnel (1) and the tailrace tunnel (2). The cofferdam body (3) is curved and is used to separate the diversion tunnel (1) and the tailrace tunnel (2).

2. The cofferdam structure for deep mountain canyons according to claim 1, characterized in that, The cofferdam body (3) has a crest axis, which includes a central axis (4) and two shoulder axes (5). The two ends of the central axis (4) are connected to the weir shoulder axis (5) through a transition arc segment so that the cofferdam body (3) is curved; The weir shoulder axis (5) connects to the base.

3. The cofferdam structure for deep mountain canyons according to claim 2, characterized in that, The central axis (4) is nearly parallel to the axis of the diversion tunnel (1) and nearly orthogonal to the axis of the tailrace tunnel (2); the weir shoulder axis (5) is nearly perpendicular to the base.

4. The cofferdam structure for deep mountain canyons according to claim 3, characterized in that, The angle between the central axis (4) and the weir shoulder axis (5) is 120°±5°, the angle between the central axis (4) and the weir shoulder axis (5) is 0°-5°, the angle between the central axis (4) and the weir shoulder axis (5) is 90°±5°, the angle between the central axis (4) and the weir shoulder axis (5) is 20°-30°, and the angle between the central axis (4) and the weir shoulder axis (5) is 20°-30°. Accordingly, the cofferdam body (3) is set in the river channel.

5. The cofferdam structure for deep mountain canyons according to claim 3, characterized in that, The angle between the weir shoulder axis (5) and the base is 90°±10°.

6. The cofferdam structure for deep mountain canyons according to claim 2, characterized in that, The radius of the transition arc segment is 2-3 times the width of the weir crest, and the wrap angle is 55°-65°.

7. The cofferdam structure for deep mountain canyons according to any one of claims 1-6, characterized in that, The cofferdam body (3) is an earth-rock cofferdam. The width of the cofferdam body (3) is not less than 3m. The elevation of the cofferdam top is the design flood level plus the safety freeboard, and the safety freeboard is 0.5-1.5m.

8. The cofferdam structure for deep mountain canyons according to claim 7, characterized in that, The slope ratio of the upstream side of the cofferdam body (3) is 1:2.0-1:3.0, and the slope ratio of the downstream side is 1:1.5-1:2.

0.

9. The cofferdam structure for deep mountain canyons according to claim 8, characterized in that, The seepage prevention method of the cofferdam body (3) is a geomembrane core wall plus a concrete seepage prevention wall.

10. A cofferdam construction system, characterized in that, The cofferdam structure for deep mountain canyons as described in any one of claims 1-9.

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