Emergency water retaining device for cofferdam

Abstract

The invention discloses a cofferdam emergency water retaining device which comprises a horizontally-arranged bottom plate and further comprises a water retaining plate with one end hinged to the front side of the upper surface of the bottom plate, and a turnover supporting device is further arranged between the water retaining plate and the bottom plate. The turnover supporting device is used for controlling the water baffle to be switched between the state that the water baffle and the bottom plate are overlapped and the vertical state that the water baffle and the bottom plate are opened in a turnover mode, and is characterized in that a telescopic water retaining mechanism is further arranged on the water baffle, and the telescopic water retaining mechanism comprises a movable plate arranged on the water baffle in the same direction and can control the movable plate to stretch out upwards. According to the device, the water retaining height can be better adjusted, the water retaining effect is improved, automatic water retaining of the device is achieved, and the device can be suitable for directly replacing a cofferdam or reinforcing an existing cofferdam at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of canal construction, and in particular relates to a cofferdam emergency water retaining device. Background Art

[0002] A cofferdam is a temporary retaining structure used in water conservancy project construction. Its main function is to prevent water and sediment from entering the construction site of the building so that drainage, excavation and construction of hydraulic structures can be carried out within the cofferdam. Especially for waterways that need to straighten river sections, cofferdams can provide a dry and safe environment for construction, ensuring the smooth progress of construction. However, some problems may be encountered when determining the cofferdam design standard: (1) The design elevation of the cofferdam depends on the diversion design flow and the working conditions of the cofferdam. For the horizontal water retaining cofferdam upstream of the channel foundation pit in the straightening section of the river, it is easy to be hit by the water flow during the flood period. Once a single point rainstorm or the water flow from the upstream of the river exceeds the diversion design flow, the cofferdam project will face the risk of flooding and even bursting the cofferdam; (2) However, in actual practice, the probability of encountering special floods is generally not high, and the cofferdam is generally only used as a temporary structure. After the main water conservancy structure is basically completed, the cofferdam will be demolished; (3) If the design standard of the cofferdam is too high, on the one hand, it will increase the cost, and on the other hand, it will cause the corresponding cofferdam bottom to occupy a larger water-passing section of the original river channel, especially for some narrower canals, which will seriously affect the flow capacity.

[0003] In order to solve the above problems, CN219886892U has disclosed a water retaining cofferdam, whose structure includes a placement base plate, a support plate, a water retaining plate and a fixed anchor rod, and a connecting shaft is fixedly installed near the edge of the top of the placement base plate. The threaded barrel at the rotating installation base can drive the supporting screw to be screwed in and out of the threaded barrel, so that the placement base plate and the support plate can be driven to be folded or propped up, which is convenient for folding transportation and propping up and laying, thereby improving the transportation efficiency and laying construction efficiency of the water retaining cofferdam, the L-shaped clamping rod on the outer wall of the water retaining plate can be inserted into the inside of the connecting barrel for clamping, the water retaining plate and the support plate are staggered, so that the connection between adjacent support plates can be blocked by the water retaining plate, and the T-shaped clamping strips of multiple groups of water retaining plates can be clamped in the clamping grooves of adjacent water retaining plates for assembly and connection, so that multiple groups of water retaining plates can be spliced, such a water retaining cofferdam structure can have a good water retaining height and can provide waterproof protection for the lateral connection.

[0004] However, the above-mentioned water retaining cofferdam still has the following defects: 1. The height of its water retaining plate is limited, and the water retaining height is limited. 2. The device needs to be operated manually and cannot be opened automatically. 3. The device is designed to directly replace the existing cofferdam for water retaining, and is not suitable for reinforcing the existing cofferdam.

[0005] Therefore, in view of the above situation, while considering the safety, temporary nature and economy of the cofferdam, how to provide a device with better water retaining effect, which can automatically sense water level changes in emergency periods, realize automatic control, and enhance the emergency water retaining effect has become a problem to be considered and solved. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a cofferdam emergency water retaining device that can better adjust the water retaining height, improve the water retaining effect, and realize automatic water retaining of the device, so that it is particularly suitable for use above the horizontal water retaining cofferdam upstream of the channel foundation pit in the earth-rock cofferdam, especially in the straightening section of the river with a smaller water retaining range.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A cofferdam emergency water retaining device comprises a horizontally arranged bottom plate, and also comprises a water retaining plate having one end hinged to the front side position of the upper surface of the bottom plate (the water-facing side is the front in the scheme, and the opposite direction is the rear), and a flipping support device is also arranged between the water retaining plate and the bottom plate, and the flipping support device is used to control the water retaining plate to switch between a superimposed state with the bottom plate and a flipped open vertical state, and is characterized in that a telescopic water retaining mechanism is also arranged on the water retaining plate, and the telescopic water retaining mechanism comprises a movable plate arranged in the same direction on the water retaining plate and can control the movable plate to extend upward.

[0008] In this way, when the water retaining plate is in a vertical water retaining state, if the water level continues to rise, the movable plate of the telescopic water retaining mechanism can be controlled to continue to extend upward, thereby adjusting the water retaining height to increase the water retaining effect.

[0009] Furthermore, the two sides of the water retaining plate are flush with the two sides of the bottom plate, so that it is convenient to install multiple devices in parallel to achieve water retaining and avoid water leakage from gaps between the devices.

[0010] Furthermore, the flip support device includes a support rod, one end of the support rod is hinged on a mounting ear fixed on the back water side of the water baffle, and the other end is hinged on a flip nut. The flip nut is screwed and matched with a flip screw arranged horizontally and perpendicular to the front side of the base plate to form a screw-nut transmission pair. The flip screw is installed in a accommodating groove on the upper surface of the base plate and is connected to a flip motor in transmission. The lower surface of the flip nut and the lower surface of the accommodating groove are in contact with the anti-rotation limiter. When the water baffle and the base plate are in a superimposed state, the mounting ear and the support rod can be accommodated in the accommodating groove and the hinged part of the support rod and the mounting ear is located above the hinged part of the flip nut. When the flip motor drives the flip nut to move from the rear side to the front side, it can drive the water baffle to flip and open to a vertical state through the support rod.

[0011] In this way, when the device is not in use, the water retaining plate is in an overlapping state with the bottom plate, the flip support device is accommodated in the accommodating groove, the hinge of the support rod and the mounting ear is located above the hinge of the flip nut, and the flip nut is located at the rear side of the flip screw. When the device is in use, the flip motor controls the rotation of the flip screw, driving the flip nut to move horizontally forward, so that the support rod gradually changes to an inclined state to slowly lift the water retaining plate. Therefore, it is convenient to control the complete overlapping and flipping of the water retaining plate and the bottom plate, so that the device can not only be used directly to replace the cofferdam, but also is very suitable for use in the reinforcement of the upper surface of the existing cofferdam for emergency water retaining. The device can be pre-installed before the water level rises to the upper surface of the cofferdam. At this time, the water retaining plate and the bottom plate are in an overlapping state, so that it does not affect the walking of pedestrians on the upper surface of the cofferdam.

[0012] As an option, the support rod is a fixed support rod and its length is equal to or less than the length of the lead screw. This makes the structure simpler and more reliable.

[0013] As another option, the support rod is a telescopic cylinder and the length after extension is greater than the length of the flip screw, which has lower requirements on the width of the base plate and saves more materials.

[0014] Furthermore, a support plate in the shape of a right triangle is provided at the front side of the upper surface of the base plate, one right-angled side of the support plate is coplanar with the rear side surface of the vertical water baffle and is arranged along the water-facing side, and the other right-angled side of the support plate can be flipped and installed in the support plate installation groove on the upper surface of the base plate.

[0015] In this way, when the water baffle plate and the bottom plate are in a superimposed state, the support plate is located in the support plate mounting groove, so that it does not affect the superposition of the water baffle plate and the bottom plate; when the water baffle plate is flipped open to a vertical state, the support plate can be flipped open to a vertical state, so that a right-angled side of one side abuts against the rear side surface of the water baffle plate, and the other right-angled side abuts against the bottom plate (the bottom surface of the support plate mounting groove), so as to better bear the water retaining pressure of the water baffle plate, improve the protection of the screw nut transmission pair, and ensure the stability and reliability of the water retaining effect.

[0016] Furthermore, it also includes an automatic sensing control system, which includes a water pressure sensor located on the front side of the base plate, and also includes a signal amplification module connected to the water pressure sensor, the signal amplification module is connected to the analog-to-digital conversion module, the analog-to-digital conversion module is connected to the controller, and the controller is connected to the flip motor.

[0017] In this way, the water pressure sensor is responsible for detecting the change of water level. When the contact senses the water pressure, the pressure change caused by the water level change is converted into a proportional electrical signal to provide the original water level data for the entire system. The signal amplification module is used to receive the electrical signal from the sensor probe and amplify the signal to prevent the signal from being lost during the transmission process. The analog-to-digital conversion module is used to convert the analog signal output by the signal processor into a digital signal so that the microcontroller can read and process it. The controller is used to receive the signal and send instructions to drive the flip motor to connect. Therefore, it can realize the automatic detection and control of the water level and improve the automation level of the water retaining device.

[0018] Further, the controller is connected to the motor in the telescopic water retaining mechanism. In this way, when it is detected that the water level is about to reach the height of the water retaining plate, the movable plate can be further controlled to extend upward, thereby improving the water retaining effect and realizing automatic control.

[0019] Furthermore, the front side of the bottom plate is an inclined surface with an upper end tilted backward and a sensor mounting groove is arranged upward, and the water pressure sensor is installed in the sensor mounting groove. This can protect the sensor from collision damage and enable it to better detect the water level.

[0020] Furthermore, the movable plate can be slidably installed up and down in a movable plate installation groove on the water retaining plate. Telescopic screws are also arranged in parallel on both sides of the movable plate in the movable plate installation groove. The telescopic screws can rotate horizontally and are limited by upper and lower positions. A telescopic nut is fixedly provided at the lower end of both sides of the movable plate and is screwed on the telescopic screw. A telescopic motor is also installed on the water retaining plate, and the telescopic motor is connected to the telescopic screw in transmission.

[0021] In this way, the telescopic motor drives the telescopic lead screw to rotate, and then drives the telescopic nut and the movable plate fixed thereto to move upward and extend through the lead screw nut transmission pair. The structure is simple and the control is stable and reliable.

[0022] Furthermore, a passive bevel gear is fixedly provided at the same height at the lower ends of the two telescopic screws, each of the passive bevel gears is connected to an active bevel gear, the two active bevel gears are fixed on the same gear shaft, and the gear shaft and the main shaft of the telescopic motor are fixedly connected in the same direction.

[0023] In this way, the telescopic motor drives the two telescopic lead screws to rotate through the bevel gear transmission, which has the advantages of simple structure and stable transmission.

[0024] Furthermore, the upper end of the movable plate has an end exposed from the movable plate mounting groove and the left and right ends extend horizontally to be flush with the left and right sides of the water retaining plate. The lower surfaces on both sides of the end are provided with water retaining skin mounting grooves. A horizontal skin rotor is arranged in the water retaining skin mounting groove along the left and right directions. A roll of water retaining skin made of waterproof flexible material is wrapped on the skin rotor. The lower end of the water retaining skin is pulled downward out of the water retaining skin mounting groove and fixed to the front side of the water retaining plate.

[0025] In this way, when the movable plate is extended upward, the water retaining skin is pulled up accordingly to block the gap between the movable plate and the water retaining plate to prevent water leakage therefrom.

[0026] Furthermore, one side of the water retaining skin is located inwardly of the front side of the movable plate, and the other side is at least flush with both sides of the water retaining plate, so that water retaining can be better achieved.

[0027] Furthermore, a fixing device is provided on the lower surface of the bottom plate, and the fixing device includes fixing nails distributed on the lower surface of the bottom plate and arranged vertically downward, so as to facilitate the fixing of the bottom plate on the upper surface of the cofferdam and better withstand the water retaining pressure from the front side during operation.

[0028] Furthermore, the fixing nail is provided with a barb to facilitate better fixing.

[0029] Furthermore, the fixing device also includes an anti-seepage baffle plate arranged at the lower end of the front side of the bottom plate, so as to better prevent seepage.

[0030] Furthermore, the anti-seepage baffle is set at an angle between the front side of the base plate and the front side inclined surface of the lower end cofferdam in the up and down directions and is flush with the left and right sides of the base plate in the left and right directions. The inner side of the anti-seepage baffle angle is rotatably installed on the front lower end of the base plate by relying on the anti-seepage baffle shaft. A compression torsion spring is also arranged between the anti-seepage baffle and the baffle shaft. The anti-seepage baffle is made of elastic material and the inner angle is smaller than the angle between the front side of the base plate and the front side inclined surface of the lower end cofferdam, which is set at 0-10°. The compression torsion spring acts on the anti-seepage baffle to provide a torque for rotating the lower end of the baffle backward and downward.

[0031] In this way, when the bottom plate is installed, the lower end of the anti-seepage baffle is turned forward and opened, so that the upper and lower ends of the anti-seepage baffle can be pressed and fitted between the front side of the bottom plate and the front inclined surface of the cofferdam (depending on the deformation of the anti-seepage baffle angle), so as to shield the gap between the lower front side of the bottom plate and the upper surface of the cofferdam, and prevent the gap from being repeatedly eroded when the water level fluctuates, thereby improving the protection effect of the cofferdam and avoiding water leakage in the gap under the action of water pressure after the water level rises. The water-blocking effect of the device is better improved.

[0032] Furthermore, the anti-seepage baffle is made of rubber material, which has the advantages of reliable elasticity and low cost.

[0033] The above device can be used in the following way: (1) First install and unfold the device at the upstream weir top, flip the anti-seepage baffle, and use the torque provided by the compression torsion spring to make the anti-seepage baffle fit tightly with the upstream weir top to prevent water from seeping into the junction between the bottom plate and the weir top; then fix the fixing nail on the weir top, and the barb on its structure can increase the stability of the bottom plate and the cofferdam. (2) When the water pressure sensor installed at the front end of the bottom plate does not detect the water pressure, the water baffle is in a horizontal closed state, which does not affect other operations on the weir top; when the water level reaches the position of the water pressure sensor, the elastic material in the water pressure sensor is deformed, and the strain gauge attached to the elastic element detects the deformation of the elastic element and outputs a corresponding proportional current. The water pressure sensor converts the pressure change caused by the water level change into a proportional electrical signal. After passing through the signal amplification module, the amplified signal is obtained, and the signal is transmitted to the analog-to-digital converter (analog-to-digital conversion module) and the controller (PLC) through the induction signal line to obtain the converted water level signal. Based on this signal, the preset control command is executed (the control effect achieved by the command is that the water level detected by the water pressure sensor always maintains a safe height with the top of the fixed water baffle), and the flip motor is controlled to drive the water baffle to flip and open to a vertical state; completing the first part of the water-blocking task. (3) When the water level continues to rise to the vicinity of the top of the water baffle, the water pressure sensor detects the set critical water level, and the controller (PLC) issues a second control logic command, and the telescopic motor starts to rotate and drives the movable plate on the water baffle to extend upward, thereby realizing the second part of the water-blocking function of the water baffle. At the same time, as the movable water baffle rises, the water-blocking skin is unfolded to prevent water from passing through the gap between the water baffle and the movable plate. (4) Conversely, when the water level drops, the device can be retracted by controlling the motor to move in the opposite direction.

[0034] The present invention has the following advantages: (1) Based on the principles of mechanics, machinery and electricity, the present invention can sense water level changes and automatically activate different levels of water retaining modes during the emergency period of the cofferdam. It has a high degree of automation and saves manpower. (2) When the water level drops, the corresponding movable water retaining plates and fixed water retaining plates can also be synchronously lowered and recovered. (3) The water retaining plates that are not in working state are placed horizontally above the fixed bottom plate, occupying a concentrated area and not affecting other operations on the cofferdam. (4) The anti-seepage baffle can prevent water from flowing over to the contact surface between the fixed bottom plate and the top of the cofferdam, and can also be applied to cofferdams with different slope ratios.

[0035] Therefore, the present invention has the ability to better adjust the water retaining height, improve the water retaining effect, and realize the effect of automatic water retaining of the device. It can be used to directly replace the cofferdam or to reinforce the existing cofferdam; it is particularly suitable for use above the horizontal water retaining cofferdam upstream of the channel foundation pit in the earth-rock cofferdam, especially in the river section with a smaller water retaining range for straightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic cross-sectional structure diagram of the cofferdam emergency water retaining device of the present invention.

[0037] Figure 2 for Figure 1 Left view of .

[0038] Figure 3 for Figure 2 The right side view shows the water retaining plate cut open along the movable plate mounting groove to show the internal structure.

[0039] Figure 4 This is a connection diagram of the automatic sensing control system.

[0040] Figure 5 for Figure 1 A partial enlarged structural diagram of the position of the separate flip motor.

[0041] Figure 6 for Figure 3 A partial enlarged structural diagram of the location of the separate telescopic motor.

[0042] Figure 7 for Figure 1 A partial enlarged structural diagram of the separate water-retaining skin.

[0043] Figure 8 It is a schematic diagram showing the structure of the compressed torsion spring alone. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with specific implementation modes.

[0045] Preferred embodiment: A cofferdam emergency water retaining device, see Figure 1-8 As shown, it includes a horizontally arranged bottom plate 1, and also includes a water retaining plate 2 with one end hinged at the front side position of the upper surface of the bottom plate 1 (the water-facing side is the front in the scheme, and the opposite direction is the rear), and a flip support device is also arranged between the water retaining plate 2 and the bottom plate. The flip support device is used to control the water retaining plate to switch between a superimposed state with the bottom plate and a flipped open vertical state. Its characteristic is that a telescopic water retaining mechanism is also arranged on the water retaining plate 2, and the telescopic water retaining mechanism includes a movable plate 3 arranged in the same direction on the water retaining plate 2 and can control the movable plate to extend upward.

[0046] In this way, when the water retaining plate is in a vertical water retaining state, if the water level continues to rise, the movable plate of the telescopic water retaining mechanism can be controlled to continue to extend upward, thereby adjusting the water retaining height to increase the water retaining effect.

[0047] The two sides of the water retaining plate 2 are flush with the two sides of the bottom plate 1. This facilitates the installation of multiple devices in parallel to achieve water retaining and avoid water leakage from gaps between the devices.

[0048] Among them, the flip support device includes a support rod 4, one end of the support rod 4 is hinged on a mounting ear 5 fixed on the back water side of the water retaining plate 2, and the other end is hinged on a flip nut 6. The flip nut 6 is screwed and matched with a flip screw 7 arranged horizontally and perpendicular to the front side of the base plate to form a screw-nut transmission pair. The flip screw 7 is installed in a accommodating groove 8 on the upper surface of the base plate and is connected to a flip motor 9 in transmission. The lower surface of the flip nut 6 and the lower surface of the accommodating groove 8 are in contact with the anti-rotation limit. When the water retaining plate 2 and the base plate 1 are in a superimposed state, the mounting ear 5 and the support rod 4 can be accommodated in the accommodating groove 8 and the hinged part of the support rod 4 and the mounting ear is located above the hinged part of the flip nut. When the flip motor 9 drives the flip nut 6 to move from the rear side to the front side, it can drive the water retaining plate 2 to flip and open to a vertical state through the support rod 4.

[0049] In this way, when the device is not in use, the water retaining plate is in an overlapping state with the bottom plate, the flip support device is accommodated in the accommodating groove, the hinge of the support rod and the mounting ear is located above the hinge of the flip nut, and the flip nut is located at the rear side of the flip screw. When the device is in use, the flip motor controls the rotation of the flip screw, driving the flip nut to move horizontally forward, so that the support rod gradually changes to an inclined state to slowly lift the water retaining plate. Therefore, it is convenient to control the complete overlapping and flipping of the water retaining plate and the bottom plate, so that the device can not only be used directly to replace the cofferdam, but also is very suitable for use in the reinforcement of the upper surface of the existing cofferdam for emergency water retaining. The device can be pre-installed before the water level rises to the upper surface of the cofferdam. At this time, the water retaining plate and the bottom plate are in an overlapping state, so that it does not affect the walking of pedestrians on the upper surface of the cofferdam.

[0050] In this embodiment, the support rod 4 is a telescopic cylinder and its length after extension is greater than the length of the flip screw 7. This has a lower width requirement for the base plate and saves more materials. During implementation, the telescopic cylinder can be a hydraulic telescopic cylinder or an electric telescopic cylinder.

[0051] As another feasible option, the support rod is a fixed support rod and its length is equal to or less than the length of the lead screw, so that the structure is simpler and more reliable.

[0052] Among them, a support plate 10 in the form of a right triangle is also arranged at the front side of the upper surface of the base plate 1. One right-angled side of the support plate 10 is coplanar with the rear side surface of the vertical water retaining plate and is arranged along the water-facing side. The other right-angled side of the support plate 10 can be flipped and installed in the support plate installation groove on the upper surface of the base plate.

[0053] In this way, when the water baffle plate and the bottom plate are in a superimposed state, the support plate is located in the support plate mounting groove, so that it does not affect the superposition of the water baffle plate and the bottom plate; when the water baffle plate is flipped open to a vertical state, the support plate can be flipped open to a vertical state, so that a right-angled side of one side abuts against the rear side surface of the water baffle plate, and the other right-angled side abuts against the bottom plate (the bottom surface of the support plate mounting groove), so as to better bear the water retaining pressure of the water baffle plate, improve the protection of the screw nut transmission pair, and ensure the stability and reliability of the water retaining effect.

[0054] It also includes an automatic sensing control system, which includes a water pressure sensor 11 located on the front side of the base plate 1, and a signal amplification module 12 connected to the water pressure sensor 11. The signal amplification module 12 is connected to an analog-to-digital conversion module 13, the analog-to-digital conversion module 13 is connected to a controller 14, and the controller 14 is connected to a flip motor 9.

[0055] In this way, the water pressure sensor is responsible for detecting the change of water level. When the contact senses the water pressure, the pressure change caused by the water level change is converted into a proportional electrical signal to provide the original water level data for the entire system. The signal amplification module is used to receive the electrical signal from the sensor probe and amplify the signal to prevent the signal from being lost during the transmission process. The analog-to-digital conversion module is used to convert the analog signal output by the signal processor into a digital signal so that the microcontroller can read and process it. The controller is used to receive the signal and send instructions to drive the flip motor to connect. Therefore, it can realize the automatic detection and control of the water level and improve the automation level of the water retaining device.

[0056] Wherein, the controller is connected to the telescopic motor 15 in the telescopic water retaining mechanism. Like this, after detecting that the water level height is about to reach the water retaining plate height, the movable plate can be further controlled to stretch out upwards, improve the water retaining effect and realize automatic control.

[0057] The front side of the bottom plate 1 is a slope with an upper end tilted backward and a sensor mounting groove 16 is arranged upward, and the water pressure sensor 11 is installed in the sensor mounting groove 16. This can protect the sensor from collision damage and enable it to better detect the water level.

[0058] Among them, the movable plate 3 can be slidably installed up and down in a movable plate mounting groove on the water baffle plate 2. Telescopic screws 17 are also arranged in parallel on both sides of the movable plate in the movable plate mounting groove. The telescopic screws 17 can rotate horizontally and are limited by upper and lower positions. A telescopic nut 18 is fixedly provided at the lower end of both sides of the movable plate 3 and is screwed on the telescopic screw 17. A telescopic motor 15 is also installed on the water baffle plate. The telescopic motor 15 and the telescopic screw 17 are transmission connected.

[0059] In this way, the telescopic motor drives the telescopic lead screw to rotate, and then drives the telescopic nut and the movable plate fixed thereto to move upward and extend through the lead screw nut transmission pair. The structure is simple and the control is stable and reliable.

[0060] Among them, a passive bevel gear 21 is fixedly provided at the same height at the lower end of the two telescopic screws 17, and each passive bevel gear 21 is connected to an active bevel gear 19. The two active bevel gears 19 are fixed on the same gear shaft 20, and the gear shaft 20 is fixedly connected to the main shaft of the telescopic motor in the same direction.

[0061] In this way, the telescopic motor drives the two telescopic lead screws to rotate through the bevel gear transmission, which has the advantages of simple structure and stable transmission.

[0062] Among them, the upper end of the movable plate 3 has an end 23 exposed from the movable plate mounting groove and the left and right ends extend horizontally to be flush with the left and right sides of the water retaining plate. The lower surfaces of the two sides of the end 23 are provided with water retaining skin mounting grooves. A horizontal skin rotor is arranged in the water retaining skin mounting groove along the left and right directions. A roll of water retaining skin 24 made of waterproof flexible material is wrapped on the skin rotor. The lower end of the water retaining skin 24 is pulled downward out of the water retaining skin mounting groove and fixed to the front side of the water retaining plate.

[0063] In this way, when the movable plate is extended upward, the water retaining skin is pulled up accordingly to block the gap between the movable plate and the water retaining plate to prevent water leakage therefrom.

[0064] One side of the water retaining skin 24 is located inwardly of the front side of the movable plate, and the other side is at least flush with both sides of the water retaining plate, so that water retaining can be better achieved.

[0065] Among them, the bottom plate 1 is provided with a fixing device on the lower surface, and the fixing device includes fixing nails 26 distributed on the lower surface of the bottom plate and arranged vertically downward. This facilitates the fixing of the bottom plate on the upper surface of the cofferdam and better withstands the water retaining pressure from the front side during operation.

[0066] Wherein, the fixing nail 26 is provided with a barb, so as to facilitate better fixing.

[0067] The fixing device further comprises an anti-seepage baffle plate 27 arranged at the lower end of the front side of the base plate, so as to better prevent seepage.

[0068] Among them, the anti-seepage baffle 27 is set at an angle between the front side of the bottom plate and the front side inclined surface of the lower end cofferdam in the up and down directions and is flush with the left and right sides of the bottom plate in the left and right directions. The inner side of the angle of the anti-seepage baffle 27 is rotatably installed on the front lower end of the bottom plate by relying on the anti-seepage baffle shaft 29. A compression torsion spring 28 is also arranged between the anti-seepage baffle and the baffle shaft. The anti-seepage baffle 27 is made of elastic material and the inner angle is smaller than the angle between the front side of the bottom plate and the front side inclined surface of the lower end cofferdam, which is set at 0-10°. The compression torsion spring 28 acts on the anti-seepage baffle to provide a torque for the lower end to rotate backward and downward.

[0069] In this way, when the bottom plate is installed, the lower end of the anti-seepage baffle is turned forward and opened, so that the upper and lower ends of the anti-seepage baffle can be pressed and fitted between the front side of the bottom plate and the front inclined surface of the cofferdam (depending on the deformation of the anti-seepage baffle angle), so as to shield the gap between the lower front side of the bottom plate and the upper surface of the cofferdam, and prevent the gap from being repeatedly eroded when the water level fluctuates, thereby improving the protection effect of the cofferdam and avoiding water leakage in the gap under the action of water pressure after the water level rises. The water-blocking effect of the device is better improved.

[0070] The anti-seepage baffle is made of rubber material, which has the advantages of reliable elasticity and low cost.

[0071] The above device can be used in the following way: (1) First install and unfold the device at the upstream weir top, flip the anti-seepage baffle, and use the torque provided by the compression torsion spring to make the anti-seepage baffle fit tightly with the upstream weir top to prevent water from seeping into the junction between the bottom plate and the weir top; then fix the fixing nail on the weir top, and the barb on its structure can increase the stability of the bottom plate and the cofferdam. (2) When the water pressure sensor installed at the front end of the bottom plate does not detect the water pressure, the water baffle is in a horizontal closed state, which does not affect other operations on the weir top; when the water level reaches the position of the water pressure sensor, the elastic material in the water pressure sensor is deformed, and the strain gauge attached to the elastic element detects the deformation of the elastic element and outputs a corresponding proportional current. The water pressure sensor converts the pressure change caused by the water level change into a proportional electrical signal. After passing through the signal amplification module, the amplified signal is obtained, and the signal is transmitted to the analog-to-digital converter (analog-to-digital conversion module) and the controller (PLC) through the induction signal line to obtain the converted water level signal. Based on this signal, the preset control command is executed (the control effect achieved by the command is that the water level detected by the water pressure sensor always maintains a safe height with the top of the fixed water baffle), and the flip motor is controlled to drive the water baffle to flip and open to a vertical state; completing the first part of the water-blocking task. (3) When the water level continues to rise to the vicinity of the top of the water baffle, the water pressure sensor detects the set critical water level, and the controller (PLC) issues a second control logic command, and the telescopic motor starts to rotate and drives the movable plate on the water baffle to extend upward, thereby realizing the second part of the water-blocking function of the water baffle. At the same time, as the movable water baffle rises, the water-blocking skin is unfolded to prevent water from passing through the gap between the water baffle and the movable plate. (4) Conversely, when the water level drops, the device can be retracted by controlling the motor to move in the opposite direction.

Claims

1. A cofferdam emergency water retaining device, comprising a horizontally arranged bottom plate, and a water retaining plate with one end hinged to the front side of the upper surface of the bottom plate, and a flip support device is arranged between the water retaining plate and the bottom plate, and the flip support device is used to control the water retaining plate to switch between a superimposed state with the bottom plate and a flipped open vertical state, characterized in that: The water retaining plate is also provided with a telescopic water retaining mechanism, which comprises a movable plate which is arranged on the water retaining plate in the same direction and can control the movable plate to extend upward.

2. The cofferdam emergency water retaining device according to claim 1, characterized in that: The two sides of the water retaining plate are arranged flush with the two sides of the bottom plate.

3. The cofferdam emergency water retaining device according to claim 1, characterized in that: The flip support device includes a support rod, one end of the support rod is hinged on a mounting ear fixed on the back water side of the water baffle, and the other end is hinged on a flip nut. The flip nut is screwed and matched with a flip screw arranged horizontally and perpendicular to the front side of the base plate to form a screw-nut transmission pair. The flip screw is installed in a accommodating groove on the upper surface of the base plate and is connected to a flip motor in transmission. The lower surface of the flip nut and the lower surface of the accommodating groove are in contact with the anti-rotation limit. When the water baffle and the base plate are in a superimposed state, the mounting ear and the support rod can be accommodated in the accommodating groove and the hinged part of the support rod and the mounting ear is located above the hinged part of the flip nut. When the flip motor drives the flip nut to move from the rear side to the front side, it can drive the water baffle to flip and open to a vertical state through the support rod.

4. The cofferdam emergency water retaining device according to claim 3, characterized in that: The support rod is a fixed support rod and its length is equal to or less than the length of the lead screw; Alternatively, the support rod is a telescopic cylinder and its length after extension is greater than the length of the flip screw.

5. The cofferdam emergency water retaining device according to claim 3, characterized in that: A right-angled triangle support plate is also provided at the front side of the upper surface of the base plate. One right-angled side of the support plate is coplanar with the rear side surface of the vertical water baffle and is arranged along the water-facing side. The other right-angled side of the support plate can be flipped and installed in the support plate installation groove on the upper surface of the base plate.

6. The cofferdam emergency water retaining device according to claim 1, characterized in that: It also includes an automatic sensing control system, which includes a water pressure sensor located on the front side of the base plate, and a signal amplification module connected to the water pressure sensor, the signal amplification module is connected to the analog-to-digital conversion module, the analog-to-digital conversion module is connected to the controller, and the controller is connected to the flip motor.

7. The cofferdam emergency water retaining device according to claim 6, characterized in that: The controller is connected to the motor in the telescopic water retaining mechanism; The front side surface of the bottom plate is an inclined surface with an upper end tilted backward and a sensor mounting groove is arranged upward, and the water pressure sensor is installed in the sensor mounting groove.

8. The cofferdam emergency water retaining device according to claim 1, characterized in that: The movable plate can be slidably installed up and down in a movable plate installation groove on the water baffle plate. Telescopic screws are also arranged in parallel on both sides of the movable plate in the movable plate installation groove. The telescopic screws can rotate horizontally and are limited by upper and lower positions. A telescopic nut is fixedly provided at the lower end of both sides of the movable plate and is screwed on the telescopic screw. A telescopic motor is also installed on the water baffle plate. The telescopic motor is connected to the telescopic screw in a transmission manner.

9. The cofferdam emergency water retaining device according to claim 8, characterized in that: A passive bevel gear is fixedly arranged at the same height at the lower ends of the two telescopic screws, each of the passive bevel gears is connected to an active bevel gear, and the two active bevel gears are fixed on the same gear shaft, and the gear shaft and the main shaft of the telescopic motor are fixedly connected in the same direction; The upper end of the movable plate has an end exposed in the movable plate installation groove and the left and right ends extend horizontally to be flush with the left and right sides of the water retaining plate, and the lower surfaces of the two sides of the end are provided with water retaining skin installation grooves, and a horizontal skin rotor is arranged in the water retaining skin installation groove along the left and right directions, and a roll of water retaining skin made of waterproof flexible material is wrapped on the skin rotor, and the lower end of the water retaining skin is pulled downward out of the water retaining skin installation groove and fixed to the front side of the water retaining plate; One side of the water retaining skin is located inwardly of the front side of the movable plate, and the other side is at least flush with the two sides of the water retaining plate.

10. The cofferdam emergency water retaining device according to claim 1, characterized in that: A fixing device is arranged on the lower surface of the bottom plate, and the fixing device comprises fixing nails distributed on the lower surface of the bottom plate and arranged vertically downward; The fixing nail is provided with a barb; The fixing device also includes an anti-seepage baffle plate arranged at the lower end position of the front side surface of the bottom plate; The anti-seepage baffle is set at an angle between the front side of the base plate and the front inclined surface of the lower end cofferdam in the up and down directions and is flush with the left and right sides of the base plate in the left and right directions. The inner side of the anti-seepage baffle angle is rotatably installed on the front lower end of the base plate by relying on the anti-seepage baffle shaft. A compression torsion spring is also arranged between the anti-seepage baffle and the baffle shaft. The anti-seepage baffle is made of elastic material and the inner angle is smaller than the angle between the front side of the base plate and the front inclined surface of the lower end cofferdam, which is set at 0-10°. The compression torsion spring acts on the anti-seepage baffle to provide a torque for rotating the lower end of the baffle backward and downward.

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