Surface water retaining device for hydraulic engineering and surface water retaining system

Abstract

This invention proposes a surface water-retaining device and system for water conservancy projects, relating to the field of water conservancy engineering technology. It includes: a gate slot, disposed at the water intake of a dam, containing a foldable box-beam gate leaf assembly. The foldable box-beam gate leaf assembly comprises multiple box beams connected sequentially along a vertical direction and has an unfolded state and a folded state. In the unfolded state, the foldable box-beam gate leaf assembly forms a continuous water-retaining surface; in the folded state, the multiple box beams are stacked and arranged. A storage slot is disposed at the bottom of the gate slot for storing the foldable box-beam gate leaf assembly in the folded state. A traction drive mechanism is used to traction drive the foldable box-beam gate leaf assembly to switch from the folded state to the unfolded state. This invention has the advantages of rapid opening and closing response, reduced operational complexity, and improved safety.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, and in particular to a surface water-retaining device and system for use in water conservancy projects. Background Technology

[0002] In the field of water conservancy engineering, the water-retaining devices of surface intake structures need to have dynamic adjustment capabilities to adapt to changes in reservoir water levels and different water intake demands. While the stacked beam gate system, widely used in traditional engineering, fulfills the water-retaining function to a certain extent, it has long faced numerous technical bottlenecks:

[0003] First, the operation process is cumbersome and time-consuming, relying on large gantry cranes to hoist the gate panels piece by piece, making it difficult to achieve rapid opening and closing response; second, the equipment matching requirements are stringent, the purchase and maintenance costs of specialized opening and closing machinery are high, and additional requirements are placed on the bearing capacity of the dam structure; third, there are significant safety hazards in operation, and accidents are prone to occur during high-altitude hoisting; fourth, the space planning is unreasonable, with independent gate storage occupying a large amount of dam space, resulting in redundant project layout.

[0004] In recent years, the industry has attempted to optimize operational efficiency through folding door leaf structures, but key problems have still been exposed in practical applications: insufficient sealing performance at the hinges, which easily leads to leakage under high water pressure conditions; lack of structural rigidity in the unfolded state, which can easily cause door flutter due to high-speed water flow impact; folding reset accuracy relies on manual calibration, resulting in frequent jamming failures; and low integration of the drive system, making it difficult to achieve automated control.

[0005] These problems highlight two major contradictions: the contradiction between the bulky design of traditional structures and the demands of efficient operation and maintenance in modern water conservancy, and the contradiction between lightweight improvements and structural reliability. Therefore, there is an urgent need for a new type of water-blocking device that integrates rapid response, autonomous operation, high stability, and intelligent control to fundamentally overcome the limitations of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one of the shortcomings of the prior art and to provide a surface water-blocking device and surface water-blocking system for water conservancy projects with the advantages of rapid opening and closing response, reduced operation complexity, and improved safety.

[0007] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.

[0008] According to one aspect of the present invention, a surface water-retaining device for hydraulic engineering is provided, comprising:

[0009] A gate slot is provided at the water intake of the dam body, and a foldable box-beam gate leaf assembly is provided inside it. The foldable box-beam gate leaf assembly has an unfolded state and a folded state. In the unfolded state, the foldable box-beam gate leaf assembly forms a continuous water-blocking surface.

[0010] A storage slot, located at the bottom of the door slot, is used to store the foldable box-beam door leaf assembly in a folded state;

[0011] A traction drive mechanism is used to traction drive the foldable box-beam door leaf assembly to switch from the folded state to the unfolded state.

[0012] In some exemplary embodiments of the present invention, based on the foregoing scheme, the foldable box girder door leaf assembly includes a plurality of box beams connected sequentially in the vertical direction, and in the folded state, the plurality of box beams are stacked and arranged.

[0013] In some exemplary embodiments of the present invention, based on the aforementioned scheme, the door slot is provided with an inclined guide surface, which extends from the working section of the door slot to the storage slot, and is used to guide the box beam to be folded from the unfolded state to the folded state.

[0014] In some exemplary embodiments of the present invention, based on the aforementioned scheme, a lifting lug plate is provided at the center of the upper surface of the topmost box girder. A connecting hole is provided on the lifting lug plate, and the traction drive mechanism is connected to the lifting lug plate through the connecting hole to traction drive the lifting lug plate to drive multiple box girder beams to switch from the folded state to the unfolded state.

[0015] In some exemplary embodiments of the present invention, based on the foregoing solution, the traction drive mechanism includes:

[0016] hoist;

[0017] The wire rope is connected to the winch at one end and detachably connected to the connecting hole at the other end.

[0018] In some exemplary embodiments of the present invention, based on the aforementioned scheme, a sealing strip is provided on the contact surface of two adjacent box beams.

[0019] In some exemplary embodiments of the present invention, based on the aforementioned scheme, two adjacent box beams are connected by a one-way limiting elastic hinge.

[0020] In some exemplary embodiments of the present invention, based on the foregoing scheme, guide rails are provided on the inner walls of both sides of the door slot. The guide rails cooperate with the side of the foldable box beam door leaf assembly to guide the foldable box beam door leaf assembly to switch between the unfolded state and the folded state.

[0021] In some exemplary embodiments of the present invention, based on the foregoing scheme, a rubber buffer pad is provided in the storage slot.

[0022] According to another aspect of the present invention, a surface water-blocking system is provided, comprising:

[0023] According to the above-mentioned surface water-blocking device for water conservancy projects, an ultrasonic water level gauge is also provided on the gate slot.

[0024] A control device, connected to the ultrasonic level gauge and the traction drive mechanism, is used to control the start and stop of the traction drive mechanism based on the water level information obtained by the ultrasonic level gauge.

[0025] In some exemplary embodiments of the present invention, based on the foregoing solution, the surface water-blocking system further includes:

[0026] A folding status detection switch is installed at the entrance of the storage slot and connected to the control device to obtain folding information of the foldable box-type beam door leaf assembly.

[0027] As can be seen from the above technical solution, the present invention has the following advantages and positive effects:

[0028] The present invention provides a surface water-blocking device and surface water-blocking system for water conservancy projects. Through the cooperation of a foldable box-beam gate leaf assembly, a storage tank and a traction drive mechanism, the foldable box-beam gate leaf assembly can be quickly unfolded and stored. This avoids the problem of traditional stacked beam gates relying on large gantry cranes to hoist each piece. It has the advantages of rapid opening and closing response, reduced operation complexity and improved safety. Attached Figure Description

[0029] The above and other features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the unfolded structure of one embodiment of the surface water-blocking device of the present invention for use in water conservancy projects.

[0031] Figure 2 yes Figure 1 Sectional view of AA in the middle;

[0032] Figure 3 yes Figure 1 Cross-sectional view of the middle section (BB);

[0033] Figure 4 This is a schematic diagram of the folded structure of one embodiment of the surface water-blocking device for water conservancy projects according to the present invention.

[0034] Explanation of reference numerals in the attached figures

[0035] 10. Door slot; 11. Box beam; 12. Storage slot; 13. Inclined guide surface; 14. Lifting lug plate; 15. Connection hole; 16. Guide rail. Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0037] The features, structures, or characteristics described above can be combined in any suitable manner in one or more embodiments, and the features discussed in the various embodiments are interchangeable where possible. In the above description, numerous specific details are provided to give a full understanding of embodiments of the invention. However, those skilled in the art will recognize that the technical solutions of the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the invention.

[0038] Although relative terms such as "up" and "down" are used in this invention to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the icon's arrangement is flipped so that it is upside down, the component described as "up" will become the component described as "down". Other relative terms such as "high", "low", "top", "bottom", "front", "back", "left", and "right" also have similar meanings. When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0039] In this invention, the terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion meaning and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.

[0040] In surface water intake structures of hydraulic engineering projects, traditional water-retaining devices employ a multi-section, independently stacked gate system for water level regulation. This structure relies on heavy-duty hoisting machinery to lift the gates one by one, with operation cycles lasting several hours, making it unsuitable for real-time control under conditions of rapid water level changes. The discontinuous water-retaining surface formed by the stacked gates poses a risk of leakage through gaps, and the joints lack overall structural rigidity, making them prone to resonance displacement under the impact of high-speed water flow. Independent gate dams require space within the dam's longitudinal dimension, increasing the structural reinforcement ratio, while high-altitude hoisting operations carry the risk of mechanical overturning.

[0041] If the above problems are not resolved, water level regulation will be delayed, leading to reservoir capacity imbalance and increasing the pressure on the spillway. Leakage will accelerate the electrochemical corrosion of metal components and shorten the equipment life cycle. Structural vibration may cause the concrete of gate slot 10 to crack. After a through crack is formed, the machine will need to be shut down for a period of time before the dam is repaired. The occupation of the gate space will force the water conveyance pipeline to detour, which will increase the hydraulic loss coefficient and directly affect the generator output rate.

[0042] Faced with the aforementioned problems, this invention first considers how to achieve rapid state transitions for the water-blocking device. Addressing the issue of traditional stacked beam gates requiring piece-by-piece hoisting, the possibility of folding the overall structure is explored. To address the large storage space requirement, the folded components are integrated into the bottom area of ​​the gate slot 10. To solve the problem of a complex drive system, the linkage control of multiple structural segments using a single power source is investigated. Simultaneously, considering the structural stability requirements in the unfolded state, the feasibility of continuously arranging box beams 11 to form a rigid water-blocking surface is explored.

[0043] According to one aspect of the present invention, a surface water-retaining device for hydraulic engineering is provided, with reference to... Figures 1 to 4 As shown, it includes:

[0044] A gate slot 10 is provided at the water intake of the dam body, and a foldable box beam 11 gate leaf assembly is provided inside it. The foldable box beam 11 gate leaf assembly has an unfolded state and a folded state. In the unfolded state, the foldable box beam 11 gate leaf assembly forms a continuous water-blocking surface.

[0045] Storage slot 12, located at the bottom of the door slot 10, is used to store the foldable box beam 11 door leaf assembly in a folded state;

[0046] A traction drive mechanism is used to traction drive the foldable box girder 11 door leaf assembly to switch from the folded state to the unfolded state.

[0047] The gate slot 10 refers to the groove structure installed at the water intake of the dam body, which internally accommodates the foldable box beam 11 gate leaf assembly. The main body of the gate slot 10 can be made of reinforced concrete or steel structure, and is used to provide the installation foundation and running track for the gate leaf assembly.

[0048] Storage slot 12 refers to the storage space set at the bottom of door slot 10. Its depth matches the height of the folded door leaf assembly. A rubber buffer pad can be set inside the storage slot 12 to prevent collision damage when the door leaf assembly is folded.

[0049] The traction drive mechanism refers to the mechanical device that provides power to fold and unfold the door leaf assembly. It can be a winch with wire rope, a hydraulic cylinder with linkage mechanism or gear and rack transmission mechanism, and controls the movement trajectory of the door leaf assembly through traction force.

[0050] The gate slot 10 provides space and guidance for the operation of the foldable box girder 11 gate leaf assembly. The storage slot 12 allows the folded foldable box girder 11 gate leaf assembly to be stored compactly without taking up additional space. The traction drive mechanism realizes the unfolding and folding of the foldable box girder 11 gate leaf assembly through a single power source, simplifying the operation process.

[0051] In some embodiments, the foldable box girder 11 door leaf assembly may include a plurality of box girder 11 connected sequentially in a vertical direction, wherein the plurality of box girder 11 are stacked in a folded state.

[0052] In other words, when multiple box beams 11 are unfolded, they form a continuous water-retaining surface, and when folded, they are stacked and stored. The box beams 11 can be made of steel plates welded into a hollow section, and adjacent beams are connected by hinges to realize the transformation between unfolded and folded forms.

[0053] Considering that relative displacement deviations are prone to occur during the stacking of box beams 11, and the spatial positioning accuracy of each unit is insufficient during folding and resetting, the movement of the foldable box beam 11 door leaf assembly is obstructed, resulting in jamming. Therefore, in some embodiments, multiple box beams 11 are vertically connected using unidirectional limiting elastic hinges. The unidirectional limiting elastic hinge includes two symmetrically distributed hinge seats, which are welded to the sidewall edges of adjacent box beams 11. In this way, the hinge rotation axis is parallel to the length direction of the door slot 10; in the folded state, the box beams 11 rotate along the hinge axis to a stacked posture, with the stacking direction consistent with the depth direction of the door slot 10. Specifically, when the traction drive mechanism pulls the top box beam 11, the stacked box beams 11 are laterally limited by the door slot 10 and move synchronously along the depth direction of the door slot 10; during the unfolding process, the one-way limiting elastic hinge restricts the box beams 11 to rotate only in the vertical plane, ensuring that adjacent box beams 11 form a continuous plane after unfolding; in the folded state, the stacked arrangement makes the box beams 11 compactly arranged along the depth direction of the door slot 10.

[0054] In the specific design, the box girder 11 can be made of steel, with each box girder 11 having a height of 1 meter, a width of 1 meter, and a length of 5 meters. The box girder 11 has internal reinforcing ribs to improve overall rigidity. Adjacent box girder 11s are connected by unidirectional limiting elastic hinges, which are also made of stainless steel and have a diameter of 10 millimeters. In the unfolded state, multiple box girder 11s unfold sequentially to form a continuous water-retaining surface. When folded, the box girder 11s fold downwards sequentially, ultimately stacked and arranged within the storage tank 12. The storage tank 12 is designed to be 0.3 meters deep, capable of accommodating 10 stacked box girder 11s.

[0055] In other embodiments, considering that multiple box girders 11 are stacked to form a water-blocking surface, there is a risk of leakage at the contact surface of adjacent box girders 11 under high water pressure conditions. Therefore, a sealing strip can be provided at the contact surface of two adjacent box girders 11.

[0056] The sealing strip can be made of elastic material with a rectangular or trapezoidal cross-section, embedded in a groove at the edge of the contact surface. The difference between the thickness of the sealing strip and the depth of the groove is controlled within the range of 1-3 mm, and the amount of compression deformation is adjusted by the pressure on the contact surface. When the contact surface is closed, the sealing strip is compressed and extends to both sides to form a continuous sealing interface. When the contact surface is separated, the sealing strip relies on its own elasticity to restore its initial shape.

[0057] Specifically, when the box girder 11 is in the unfolded state, the sealing strip undergoes pre-compression deformation between the contact surfaces of adjacent box girder 11s, filling the microscopically uneven areas of the contact surfaces and blocking the water seepage path. For example, a sealing strip made of neoprene rubber undergoes 15%-20% compression deformation under 0.5 MPa water pressure, forming a gapless seal. When the box girder 11 is switched to the folded state, the elastic restoring force of the sealing strip causes the contact surfaces of adjacent box girder 11s to automatically separate, avoiding difficulties in unfolding due to adsorption in the stacked state. This structure achieves dynamic sealing through the deformation of the contact surfaces themselves without the need for additional locking devices, while also being compatible with the switching requirements of both folded and unfolded states.

[0058] In other embodiments, considering that multiple box beams 11 may deviate in their movement trajectory when stacked during the folding process, resulting in obstruction of the folding action or misalignment between layers, an inclined guide surface 13 can be designed inside the door slot 10. The inclined guide surface 13 extends from the working section of the door slot 10 to the storage slot 12 to guide the box beams 11 to be folded from the unfolded state to the folded state.

[0059] In this way, the inclined guide surface 13 is arranged on the inner walls of both sides of the door slot 10, and its inclination angle matches the folding path of the box beam 11; the guide surface adopts a continuous smooth surface, and the extension direction is consistent with the displacement direction when the box beam 11 is folded; the bottom end of the guide surface is aligned with the entrance of the storage slot 12 to ensure that the folded box beam 11 accurately enters the storage slot 12.

[0060] Specifically, the inclined guide surface 13 can be designed in an arc shape, with its radius of curvature matching the length of the box girder 11. The surface of the inclined guide surface 13 is treated with a low-friction coefficient material, such as a polytetrafluoroethylene coating. During the transition of the box girder 11 from its unfolded state to its folded state, the bottom edge of the box girder 11 contacts and slides along the inclined guide surface 13. Thus, under its own weight and water pressure, the box girder 11 smoothly slides down the inclined guide surface 13 and gradually folds.

[0061] However, there is still a risk of motion trajectory deviation during the switching between unfolded and folded states of the foldable box beam 11 door leaf assembly, which may cause friction or jamming between the door leaf assembly and the inner wall of the door slot 10, affecting operational stability and reliability.

[0062] In this regard, refer to Figures 1 to 4 As shown, the inner walls on both sides of the door slot 10 can be designed with guide rails 16, which cooperate with the side of the foldable box beam 11 door leaf assembly to guide the foldable box beam 11 door leaf assembly to switch between the unfolded state and the folded state.

[0063] In some embodiments, the guide rail 16 may be designed with an I-shaped cross-section, its vertical web embedded in the concrete structure of the door slot 10, and its horizontal flange extending into the interior space of the door slot 10; guide sliders are welded to the sides of the foldable box-girder 11 door leaf assembly, and the guide sliders have grooves that match the horizontal flanges, with high-polymer wear-resistant pads embedded in the grooves. The guide rail 16 is continuously arranged along the working section of the door slot 10 to the entrance of the storage tank 12, and its axis is consistent with the extension direction of the inclined guide surface 13, forming a continuous guide path.

[0064] In this way, when the traction drive mechanism pulls the door leaf assembly to unfold, the guide slider slides along the horizontal flange of the guide rail 16, restricting the horizontal displacement of the door leaf assembly and ensuring that each box beam 11 moves to the working section along the preset trajectory; during the folding process, the box beam 11 is guided by the inclined guide surface 13 to move towards the storage tank 12. At this time, the guide slider cooperates with the guide rail 16 to constrain the lateral offset of the door beam and avoid misalignment of adjacent box beams 11 during the stacking process.

[0065] In addition, to enhance the reliability and flexibility of the connection between the traction drive mechanism and the foldable box girder 11 leaf assembly, [reference needed]. Figure 1As shown, the topmost box beam 11 can also be designed with a lifting lug plate 14 in the center of its upper surface. The lifting lug plate 14 has a connecting hole 15. The traction drive mechanism is connected to the lifting lug plate 14 through the connecting hole 15, so as to drive the lifting lug plate 14 to drive multiple box beams 11 to switch from the folded state to the unfolded state.

[0066] The lifting lug plate 14 can be designed to be made of high-strength steel and has a rectangular plate structure. The length of the lifting lug plate 14 is approximately equal to the width of the box girder 11, and the width is one-third of the width of the box girder 11. It is fixed to the center of the upper surface of the topmost box girder 11 by welding. The connecting hole 15 is located at the center of the lifting lug plate 14 and can be circular or elliptical. The connecting components of the traction drive mechanism can be detachably connected to the lifting lug plate 14 through the connecting hole 15.

[0067] In actual operation, when it is necessary to switch the foldable box girder 11 gate leaf assembly from the folded state to the unfolded state, firstly, the connecting component of the traction drive mechanism is connected to the lifting lug plate 14 through the connecting hole 15. Then, the traction drive mechanism is activated, and an upward traction force is applied to the lifting lug plate 14 through the connecting component. As a result, the topmost box girder 11 is driven to move upward, thereby causing the box girder 11 below to unfold one by one until all box girder 11 are fully unfolded to form a continuous water-retaining surface.

[0068] Because the lifting lug 14 is positioned at the center of the topmost box girder 11, it ensures even distribution of traction force, preventing the box girder 11 from tilting or jamming during deployment. The design of the connecting hole 15 allows the traction drive mechanism to form a reliable connection with the lifting lug 14 while facilitating disassembly, thus improving operational flexibility. Furthermore, the entire door leaf assembly can be deployed through a single point of traction via the connecting hole 15 in the lifting lug 14, simplifying the operation process, reducing manpower requirements, and improving the response speed and working efficiency of the water-blocking device.

[0069] Considering the maintenance issues when the traction drive mechanism is connected to the connecting hole 15, in some embodiments, the traction drive mechanism may also be designed to include:

[0070] hoist;

[0071] A steel wire rope, one end of which is wound around the winch, and the other end is detachably connected to the connection hole 15.

[0072] The winch is fixed to the dam top platform, and the wire rope is wound on the winch drum. The end of the wire rope can be equipped with a quick-release buckle, and the buckle pin passes through the connection hole 15 of the lifting lug plate 14 to achieve a detachable connection. The surface of the winch drum can also be designed with spiral rope grooves to ensure that the wire rope is neatly arranged when it is wound in layers.

[0073] Based on this, when the winch starts, the motor drives the drum to rotate, and the wire rope is wound in an orderly manner along the spiral rope groove. The shackle drives the lifting lug 14 to rise vertically, gradually unfolding the folded box girder 11 door leaf assembly. After unfolding, the wire rope tension keeps the shackle and connecting hole 15 in a self-locking state. When the door leaf needs to be retracted, the winch reverses to release the wire rope, and the door leaf assembly slides into the storage groove 12 along the inclined guide surface 13 under its own weight. During maintenance, the operator can manually pull out the shackle pin to separate the wire rope from the lifting lug 14, facilitating separate maintenance of the winch or replacement of the wire rope. The spiral rope groove structure prevents the wire rope from becoming tangled during winding and unwinding, ensuring a smooth and reliable traction process.

[0074] According to another aspect of the present invention, a surface water-blocking system is provided, comprising:

[0075] According to the above-mentioned surface water-blocking device for water conservancy projects, an ultrasonic water level gauge is also provided on the gate slot 10.

[0076] A control device, connected to the ultrasonic level gauge and the traction drive mechanism, is used to control the start and stop of the traction drive mechanism based on the water level information obtained by the ultrasonic level gauge.

[0077] An ultrasonic water level gauge is fixed to the top of the gate slot 10 to collect water level data in front of the dam in real time and transmit it to the control device. The control device integrates a logic processing module, presets a water level threshold range, and generates start and stop commands by comparing the real-time water level with the threshold range.

[0078] Specifically, when the ultrasonic level gauge detects that the current water level exceeds the preset upper limit, the control device starts the winch, driving the wire rope to pull the gate leaf assembly to the target working position. During the unfolding process, the guide rail 16 cooperates with the side of the gate leaf to ensure vertical movement accuracy and avoid deviation and jamming. When the water level drops to the lower limit, the control device reverses the drive of the winch to retract the gate leaf assembly, and the folding status detection switch provides real-time feedback of the assembly being fully retracted, ensuring that the traction action terminates at a safe position. Through closed-loop control of water level data and folding status, the system achieves adaptive adjustment under unattended operation, eliminating the risk of delays and misjudgments caused by manual operation, while also avoiding equipment damage caused by the gate leaf not being fully folded.

[0079] In one implementation, ultrasonic level gauges can be installed on the working gate piers on both sides of the top of the gate slot 10, with their transmitting and receiving ends forming a horizontal detection axis. The control device uses a PLC controller, which has a preset water level threshold parameter set, including an upper warning water level value and a lower working water level value. When the ultrasonic level gauge detects that the current water level exceeds the upper warning water level, the PLC controller generates a start command, controlling the winch to rotate forward, and using a wire rope to pull the lifting lug plate 14 to move the gate leaf assembly of the box beam 11 from the storage tank 12 to the unfolded state; when the water level is detected to have fallen back to the lower working water level, the PLC controller triggers a stop command to brake the winch, and at the same time starts a reverse program to drive the gate leaf assembly to fold and reset. The folding state detection switch uses a photoelectric sensor array, arranged at the end of the guide rail at the entrance of the storage tank 12. When the last box beam 11 is completely inside the storage tank 12, a positioning signal is triggered, and the PLC controller cuts off the power to the winch accordingly.

[0080] In addition, the foldable box girder 11-leaf assembly may have a blind spot in position detection during the folding and resetting process. Manual calibration makes it difficult to judge the folding status in real time, which may easily cause the traction drive mechanism to run over the range or fail to fold properly, resulting in the risk of equipment jamming.

[0081] Therefore, other surface water-retaining systems that can be designed include:

[0082] A folding status detection switch is installed at the entrance of storage slot 12 and connected to the control device to obtain folding information of the foldable box beam 11 door leaf assembly.

[0083] In some implementations, the folding state detection switch uses a contact sensor installed on the inlet sidewall of the storage slot 12 to detect physical contact signals when the door leaf assembly is fully folded.

[0084] Specifically, the folding state detection switch can be installed at a preset position at the entrance of the storage slot 12, with its detection surface facing the movement path of the door leaf assembly. When the folded box beams 11 are stacked and arranged to the entrance of the storage slot 12, the triggering mechanism of the detection switch forms a contact or non-contact signal transmission with a specific part of the bottom box beam 11. The connection line between the detection switch and the control device is integrated into the wiring channel inside the door slot 10, and the signal transmission uses an opto-isolated circuit. For example, the detection switch can be selected as a contact microswitch or a non-contact photoelectric sensor, and its installation position is determined by finite element analysis, located in a side wall groove 15-20 cm above the entrance of the storage slot 12.

[0085] Thus, when the traction drive mechanism pulls the door leaf assembly towards the storage tank 12, the folded box girder 11 stack slides into the storage tank 12 along the inclined guide surface 13. When the guide wheel of the bottom box girder 11 contacts the inlet limit block of the storage tank 12, the end of the box girder 11 stack triggers the sensing area of ​​the detection switch. At this time, the detection switch generates an electrical signal and transmits it to the control device. Upon receiving the signal, the control device immediately cuts off the power supply circuit of the winch and activates the brake, stopping the wire rope traction. During this process, the triggering accuracy of the detection switch is achieved by adjusting the installation angle and sensing distance, and its repeatability error is controlled within ±2 mm. By providing real-time feedback on the folding status information, problems such as deformation of the box girder 11 due to excessive traction or sealing failure caused by insufficient traction can be avoided.

[0086] It should be understood that the application of this invention is not limited to the detailed structure and arrangement of the components proposed herein. This invention can have other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this invention. It should be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the invention. The embodiments described herein illustrate the best known mode for carrying out the invention and will enable those skilled in the art to utilize the invention.

Claims

1. A surface water-retaining device for water conservancy projects, characterized in that, include: A gate slot is installed at the water intake of the dam body, and a foldable box-beam gate leaf assembly is installed inside it. The foldable box-beam gate leaf assembly includes multiple box beams connected sequentially in the vertical direction and has an unfolded state and a folded state. In the unfolded state, the foldable box-beam gate leaf assembly forms a continuous water-retaining surface. In the folded state, the multiple box beams are stacked and arranged. Adjacent box beams are connected by a one-way limiting elastic hinge. A storage slot, located at the bottom of the door slot, is used to store the foldable box-beam door leaf assembly in a folded state; A traction drive mechanism is used to traction drive the foldable box-beam door leaf assembly to switch from the folded state to the unfolded state.

2. The surface water-retaining device for water conservancy projects according to claim 1, characterized in that, The door slot is provided with an inclined guide surface, which extends from the working section of the door slot to the storage slot, and is used to guide the box beam to be folded from the unfolded state to the folded state.

3. The surface water-retaining device for water conservancy projects according to claim 1, characterized in that, The topmost box girder has a lifting lug plate in the center of its upper surface. The lifting lug plate has a connecting hole. The traction drive mechanism is connected to the lifting lug plate through the connecting hole, so as to drive the lifting lug plate to switch multiple box girders from the folded state to the unfolded state.

4. The surface water-retaining device for water conservancy projects according to claim 3, characterized in that, The traction drive mechanism includes: hoist; A steel wire rope, one end of which is wound around the winch, and the other end is detachably connected to the connecting hole.

5. The surface water-retaining device for water conservancy projects according to claim 1, characterized in that, Sealing strips are installed on the contact surfaces of two adjacent box girders.

6. The surface water-retaining device for water conservancy projects according to claim 1, characterized in that, The inner walls on both sides of the door slot are provided with guide rails, which cooperate with the side of the foldable box beam door leaf assembly to guide the foldable box beam door leaf assembly to switch between the unfolded state and the folded state.

7. The surface water-retaining device for water conservancy projects according to claim 1, characterized in that, A rubber cushioning pad is installed inside the storage tank.

8. A surface water-blocking system, characterized in that, include: The surface water-blocking device for water conservancy projects according to any one of claims 1-7, wherein an ultrasonic water level gauge is further provided on the gate slot; A control device, connected to the ultrasonic level gauge and the traction drive mechanism, is used to control the start and stop of the traction drive mechanism based on the water level information obtained by the ultrasonic level gauge.

9. The surface water-blocking system according to claim 8, characterized in that, The surface water-blocking system also includes: A folding status detection switch is installed at the entrance of the storage slot and connected to the control device to obtain folding information of the foldable box-type beam door leaf assembly.

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