Water injection device in cofferdam

Abstract

The invention relates to cofferdam construction engineering, in particular to an in-cofferdam water injection device which comprises siphons, an energy system and a monitoring system. The siphon comprises a supporting section and two drainage sections which are connected to the two ends of the supporting section and incline towards the same side. The supporting section is provided with a water injection opening which communicates the inside and outside of the siphon and can be controllably opened and closed. The ends, away from the supporting section, of the two drainage sections serve as a water inlet and a water outlet of the siphon correspondingly, and the water outlet is controllably opened or closed. The energy system comprises a turbine arranged in the siphon and a generator connected to the turbine. And the turbine rotates under the pushing of water flow in the siphon to drive the generator to generate electricity. The monitoring system is electrically connected with the generator and comprises a displacement sensor used for sensing the displacement condition of the cofferdam and a controller electrically connected to the displacement sensor. Water transfer and transfer condition monitoring can be achieved without external energy, and energy saving and structure simplification are facilitated.

Description

Technical Field

[0001] The invention relates to a cofferdam construction project, in particular to a water injection device in a cofferdam. Background Art

[0002] When constructing a cofferdam, it is necessary to form an annular inner wall and an outer wall sleeved outside the inner wall at a preset position, and fill the space between the inner wall and the outer wall to form a weir core, thereby obtaining a cofferdam with high strength. After the cofferdam is built, the water in the cofferdam needs to be discharged to facilitate underwater construction in the cofferdam. When the cofferdam is dismantled after the construction is completed, in order to prevent the water from having a strong impact on the underwater building, causing serious consumption or even damage to the underwater building, it is necessary to fill the cofferdam with water until the inner and outer liquid levels are basically flush, and then dismantle the cofferdam, thereby reducing the impact of the water on the underwater building.

[0003] At present, water pumps are usually used to pump water. However, water pump operation requires laying long-distance wires or using fuel generators to generate electricity. When water is injected into the cofferdam, most of the construction has been completed. While water injection and dismantling operations are being carried out, equipment evacuation is also required, making it difficult to ensure the power supply of the water pumps. Summary of the invention

[0004] The object of the present invention is to provide a water injection device in a cofferdam which does not require external power supply.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A water injection device in a cofferdam, comprising:

[0007] A siphon pipe, comprising a support section and two drainage sections connected to both ends of the support section and extending obliquely toward the same side, wherein the support section is provided with a water injection port communicating with the inside and outside of the siphon pipe, and the water injection port can be controllably opened or closed, and one end of the two drainage sections away from the support section is respectively a water inlet and a water outlet of the siphon pipe, and the water outlet can be controllably opened or closed;

[0008] An energy system, comprising a turbine built into the siphon and a generator connected to the turbine, wherein the turbine rotates under the impetus of the water flow in the siphon, driving the generator to generate electricity;

[0009] The monitoring system is electrically connected to the generator and includes a displacement sensor for sensing the displacement of the cofferdam and a controller electrically connected to the displacement sensor.

[0010] Optionally, the water outlet of the siphon tube is provided with a pull valve, which includes a valve chamber, a valve plug, a pull rod and an elastic member. The valve chamber is embedded in the siphon tube and is constructed as a chamber-like structure with openings at both ends along the direction of the siphon tube. The valve plug is accommodated in the valve chamber and structurally matched with the valve chamber for closing any opening of the valve chamber. The pull rod passes through the opening of the end of the valve chamber away from the supporting section and is connected to the valve plug. The elastic member is connected between the valve plug and any opening of the valve chamber for pushing the valve plug to block or away from any opening of the valve chamber.

[0011] Optionally, one end of the pull rod away from the valve plug is connected to an electric winch via a wire rope, and slides controllably with the rotation of the electric winch, and the electric winch is electrically connected to the controller.

[0012] Optionally, the electric winch is connected to the supporting section of the siphon tube, and the line passes around a plurality of guide pulleys connected to the siphon tube.

[0013] Optionally, the energy system further includes a battery, which is used to store the electrical energy generated by the generator and release the electrical energy to the controller.

[0014] Optionally, the monitoring system further comprises a water level sensor, and the water level sensor is used to sense the water level in the cofferdam.

[0015] Optionally, a plurality of the water level sensors are arranged in a plurality of circles along the cofferdam and close to the inner wall of the cofferdam.

[0016] Optionally, the displacement sensor is arranged in a plurality of circles along the cofferdam and is arranged at the top of the cofferdam core.

[0017] Optionally, the controller includes a wireless transmission module for achieving information synchronization with a host.

[0018] Optionally, the siphon is formed by assembling a plurality of detachably connected segmented pipes.

[0019] The beneficial effects of the present invention are as follows: the water outside the cofferdam is connected with the inside of the cofferdam through a siphon tube, the water outlet is closed and water is added to the siphon tube from the water injection port, after the water is added, the water injection port is closed and the water outlet is opened, thereby inducing a siphon effect, so that the water outside the cofferdam is continuously injected into the cofferdam, and at the same time, the turbine of the energy system is driven by hydraulic power to rotate continuously, driving the generator to generate electricity and supply energy to the monitoring system, and the displacement of the cofferdam is monitored by the monitoring system. When the displacement of the cofferdam is abnormal, the water outlet is closed in time to stop the transfer of the water body, thereby improving safety. The transfer of the water body is achieved by the siphon effect, and there is no need to provide additional energy such as electricity, and electricity can be generated for consumption by the monitoring system, thereby achieving energy self-sufficiency, reducing construction and operation costs, and facilitating the transfer of equipment while injecting water into the cofferdam, which is beneficial to improving construction efficiency.

[0020] Furthermore, the valve plug is pushed by the elastic member to block any opening of the valve chamber, so that the water outlet of the siphon tube is closed. By pulling the pull rod, the valve plug is separated from the two openings of the valve chamber, so that the water outlet of the siphon tube is opened, thereby realizing the controllable opening and closing of the water outlet of the siphon tube with a simple structure.

[0021] Furthermore, by pulling the pull rod with an electric winch electrically connected to the controller, the opening and closing of the water outlet of the siphon tube can be controlled remotely or automatically according to the detection results of the monitoring system, which helps to improve the response speed and thus improve safety.

[0022] Furthermore, the extension direction of the wire rope is adjusted by the guide pulley, so that the electric winch can be easily arranged on the supporting section of the siphon tube to prevent the electric winch from short-circuiting due to water ingress.

[0023] Furthermore, by providing a storage battery, it is convenient to store electric energy, and the output voltage is relatively stable, which prevents the fluctuation of the power supply of the generator from causing the detection data of the monitoring system to be intermittent.

[0024] Furthermore, water level sensors are used to sense the water levels and changes in different areas of the cofferdam, thereby preventing safety problems in the cofferdam caused by uneven water level changes in different areas.

[0025] Furthermore, by providing a wireless transmission module on the controller, data is transmitted and updated in real time, thereby avoiding the risk of data loss caused by controller failure and facilitating real-time viewing of data input instructions through multiple displays at different locations.

[0026] Furthermore, the siphon is constructed into a detachable structure to facilitate transportation and transfer of the siphon.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a water injection device in a cofferdam shown in Embodiment 1 of the present invention;

[0029] Figure 2 It is a schematic structural diagram of a pull valve shown in the first embodiment of the present invention.

[0030] Legend: 1-siphon, 11-support section, 111-water inlet, 12-drainage section, 121-water inlet, 122-water outlet, 13-pull valve, 131-valve chamber, 132-valve plug, 133-pull rod, 134-elastic member, 135-pull ring, 136-accommodating step, 14-electric winch, 141-rope, 15-guide pulley, 21-turbine, 211-volute casing. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] See also Figure 1The water injection device in the cofferdam to be protected by the present invention comprises a siphon 1, an energy system and a monitoring system. The siphon 1 comprises a supporting section 11 and two drainage sections 12 connected to the two ends of the supporting section 11 and inclined toward the same side. The supporting section 11 is provided with a water injection port 111 which is connected to the inside and outside of the siphon 1 and can be opened and closed controllably. The ends of the two drainage sections 12 away from the supporting section 11 are respectively the water inlet 121 and the water outlet 122 of the siphon 1, and the water outlet 122 can be opened or closed controllably. The energy system comprises a turbine 21 built into the siphon 1 and a generator connected to the turbine 21. The turbine 21 rotates under the impetus of the water flow in the siphon 1, driving the generator to generate electricity. The monitoring system is electrically connected to the generator, and comprises a displacement sensor for sensing the displacement of the cofferdam and a controller electrically connected to the displacement sensor.

[0036] The water outside the cofferdam is connected to the inside of the cofferdam through the siphon tube 1, the water outlet 122 is closed and water is added to the siphon tube 1 from the water injection port 111. After the water is added, the water injection port 111 is closed and the water outlet 122 is opened, which triggers the siphon effect, so that the water outside the cofferdam is continuously injected into the cofferdam. At the same time, the turbine 21 of the hydraulically driven energy system keeps rotating, driving the generator to generate electricity and supply energy to the monitoring system, and the displacement of the cofferdam is monitored by the monitoring system. When the displacement of the cofferdam is abnormal, the water outlet 122 is closed in time to stop the transfer of the water body, thereby improving safety. The transfer of the water body is achieved by the siphon effect, without the need to provide additional energy such as electricity, and can generate electricity for consumption by the monitoring system, achieving energy self-sufficiency, reducing construction and operation costs, and helping to complete the transfer of equipment while injecting water into the cofferdam, which is conducive to improving construction efficiency.

[0037] Please refer to the following examples for details.

[0038] Embodiment 1:

[0039] See also Figure 1 , the water injection device in the cofferdam shown in a preferred embodiment of the present application includes a siphon 1, an energy system and a monitoring system. The cofferdam is composed of an inner wall, an outer wall and a weir core filled between the inner wall and the outer wall, and the water injection device in the cofferdam is arranged as a whole on the top of the cofferdam. The siphon 1 connects the horizontal plane outside the cofferdam and the internal space of the cofferdam, and transfers the water from outside the cofferdam to inside the cofferdam through the siphon effect. The energy system converts the kinetic energy of the water flow in the siphon 1 into electrical energy, thereby supplying energy to the monitoring system. The monitoring system includes a controller and multiple sensors electrically connected to the energy system, which are used to monitor the water level changes and cofferdam displacement caused by the water transfer in real time.

[0040] The siphon 1 includes a support section 11 and a drainage section 12 connected to both ends of the support section 11. The support section 11 is horizontally arranged and its length matches the width of the cofferdam. The top of the support section 11 is opened to form a water injection port 111. The water injection port 111 is arranged near the middle of the support section 11 and is equipped with a water stop valve. The opening and closing of the water injection port 111 is controlled by turning the water stop wrench of the water stop valve. The drainage section 12 is inclined downward, and its length and inclination angle match the height of the cofferdam and the horizontal plane, so that the water inlet 121 at one end of the drainage section 12 located near the outside of the cofferdam away from the support section 11 sinks below the horizontal plane. The water inlet 121 of the siphon 1 and the water outlet 122 arranged at one end of the other drainage section 12 away from the support section 11 are both embedded with a pull valve 13, which are respectively used to control the opening and closing of the water inlet 121 and the water outlet 122 of the siphon 1.

[0041] The water outside the cofferdam is connected to the inside of the cofferdam through the siphon tube 1, and the two pull valves 13 set at the water inlet 121 and the water outlet 122 are closed, and water is added to the siphon tube 1 from the water injection port 111. After the water is added, the water injection port 111 is closed and the water outlet 122 is opened, which triggers the siphon effect, so that the water outside the cofferdam is continuously injected into the cofferdam, and the water body is automatically transferred. The transfer of the water body can be stopped by closing any pull valve 13. When the transfer needs to be started again, both pull valves 13 can be kept open.

[0042] See also Figure 2 The pull valve 13 includes a valve chamber 131, a valve plug 132, a pull rod 133 and an elastic member 134. The outer wall of the valve chamber 131 is tightly connected to the inner wall of the siphon tube 1, and has two circular openings arranged opposite to each other along the direction of the siphon tube 1, so that the inside and outside of the pull valve 13 are connected only through these two openings. The cylindrical valve plug 132 has a diameter larger than the opening of the valve chamber 131, a length smaller than the valve chamber 131, and is accommodated in the valve chamber 131. An elastic member 134 is arranged between one end of the valve plug 132 away from the support section 11 and the other opening of the valve chamber 131. The elastic member 134 is a pre-tightened compression spring that contacts between the valve chamber 131 and the valve plug 132, pushing the valve plug 132 to contact the opening of the valve chamber 131 close to the support section 11, so that the liquid cannot pass through, so that the pull valve 13 is in a normally closed state. One end of the pull rod 133 passes through the water inlet 121 or the water outlet 122 from outside the siphon 1 into the valve chamber 131 and is connected to the valve plug 132, and the other end is located outside the siphon 1 and forms a circular pull ring 135. By pulling the pull ring 135, the valve plug 132 is moved away from the opening of the valve chamber 131, the compression spring is compressed, and the pull valve 13 is opened.

[0043] An accommodating step 136 is provided at the opening of the valve chamber 131 away from the supporting section 11. The accommodating step 136 is connected to the inner wall of the valve chamber 131, and the diameter of its inner circle is larger than the diameter of the compression spring and smaller than the diameter of the valve plug 132. The thickness of the accommodating step 136 is slightly larger than the minimum length of the compression spring. When the compression spring is difficult to automatically push the valve plug 132 to reset due to wear and tear, the pull ring 135 can be continuously pulled to make the valve plug 132 contact the accommodating step 136, thereby closing the pull valve 13. This helps to improve the fault tolerance of the water injection device in the cofferdam, ensure the reliability of the emergency closure of the pull valve 13, and thus improve the safety of water injection in the cofferdam.

[0044] In this embodiment, the siphon tube 1 is made of a high-quality steel pipe with a diameter of 20 cm and a wall thickness of 5 mm, which ensures the stability and durability of the structure. It is cut into multiple segmented pipes during transportation and transfer, and connected by welding before use.

[0045] See also Figure 1 , the siphon 1 also includes an electric winch 14 and a plurality of guide pulleys 15. The electric winch 14 is fixedly connected to the top of the support section 11 and is arranged near the middle of the support section 11. The two electric winches 14 correspond to the two pull valves 13 and the two groups of guide pulleys 15 respectively. The guide pulleys 15 in each group are respectively arranged at the water inlet 121 or the water outlet 122 and the connection between the support section 11 and the drainage section 12. The rope 141 of the electric winch 14 passes around the two guide pulleys 15 in a group in turn and is connected to the pull ring 135 of the pull rod 133, thereby controlling the opening and closing of the pull valve 13. The water injection port 111 is arranged between the two electric winches 14 to prevent the rope 141 from interfering with water addition. The electric winch 14 is electrically connected to the controller, and the consumed electric energy is provided by the controller.

[0046] The energy system includes a turbine 21, a generator and a battery. The turbine 21 is built into the siphon 1 and is arranged in the middle of the support section 11. The diameter of the turbine 21 is 30 cm, and it is made of aluminum alloy. It is arranged parallel to the support section 11 of the siphon 1 and rotates freely along the central axis in the vertical plane. Since the diameter of the turbine 21 is larger than the diameter of the siphon 1, the support section 11 of the siphon 1 can be formed by connecting the volute 211 of the turbine 21 at one end of two identical water pipes, so that the turbine 21 is conveniently built into the support section 11. The central axis of the turbine 21 is connected to the rotor of the generator, driving the rotor of the generator to rotate synchronously with the turbine 21 on the same axis, thereby generating electrical energy. The generator in this embodiment is a brushless permanent magnet generator, which can generate up to 5kw of electricity when siphoning occurs, but has the problem of unstable output voltage. The battery is electrically connected to the generator and the controller, and the electrical energy is stored and released to the controller, which helps to improve the stability of the output voltage and helps the stable operation of the monitoring system and the electric winch 14. Because the two pull valves 13 need to be opened before the siphon occurs, and the generator has not started working at this time, the present embodiment can only store a small amount of electric energy in the battery in advance to provide short-term working energy for the electric winch 14. In other embodiments, the pull valve 13 can also be opened by manually pulling the rope 141 for a short period of time until the electric winch 14 starts working.

[0047] The monitoring system includes the above-mentioned controller, and also includes a displacement sensor and a water level sensor. In this embodiment, the displacement sensor adopts a single-point displacement meter, which is set at the top of the cofferdam and inserted into the soil layer of the weir core, and is set every 100 meters. In this embodiment, the water level sensor adopts an immersion water level meter, which is put into the bottom of the foundation pit inside the cofferdam along the inner wall of the cofferdam, and is set every 100 meters, so that multiple water level sensors are arranged along the inner wall edge of the cofferdam for a week, and the positions where the foundation pit elevation changes greatly and each partition area are arranged. The displacement sensor and water level sensor in this embodiment both adopt RS486 format output models, which are widely compatible with equipment and help reduce hardware costs. The controller is electrically connected to the displacement sensor and the water level sensor, including an RS486 acquisition module, a processor and a wireless transmission module. The sensor data is uniformly collected and synchronized to the external host through the wireless transmission module, which helps to retain the backup data, and facilitates the staff at different locations to view the data input instructions in time through the extension of the wireless connection to the host, and facilitates multiple personnel to monitor at the same time, which helps to improve safety.

[0048] The beneficial effects of the present invention are: the device works stably and reliably, it is easy to monitor the water injection situation and make timely adjustments, it has high safety and does not require external energy intervention, it reduces construction and operation costs, reduces negative impacts on the environment, and makes the water injection in the cofferdam and the evacuation of equipment on the cofferdam independent of each other, which helps to improve overall construction efficiency and shorten construction period.

[0049] Embodiment 2:

[0050] The difference between this embodiment and the first embodiment is that the pull valve 13, the electric winch 14 and the guide pulley 15 in this embodiment are replaced by an electromagnetic valve that is powered on and closed. The water outlet 122 is physically blocked before the siphon effect is triggered, and is manually unblocked after the water is added. The electromagnetic valve is used to close the water outlet 122 and / or the water inlet 121 only when the water transportation is suspended midway.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A water injection device in a cofferdam, characterized in that: include: A siphon pipe (1), comprising a support section (11) and two drainage sections (12) connected to both ends of the support section (11) and extending obliquely toward the same side, the support section (11) being provided with a water injection port (111) communicating with the inside and outside of the siphon pipe (1), and the water injection port (111) being controllably openable or closed, and the ends of the two drainage sections (12) away from the support section (11) being respectively the water inlet (121) and the water outlet (122) of the siphon pipe (1), and the water outlet (122) being controllably openable or closed; An energy system comprises a turbine (21) built into the siphon (1) and a generator connected to the turbine (21), wherein the turbine (21) rotates under the impetus of the water flow in the siphon (1), thereby driving the generator to generate electricity; The monitoring system is electrically connected to the generator and includes a displacement sensor for sensing the displacement of the cofferdam and a controller electrically connected to the displacement sensor.

2. The water injection device in the cofferdam according to claim 1, characterized in that: The water outlet (122) of the siphon tube (1) is provided with a pull valve (13), the pull valve (13) comprising a valve chamber (131), a valve plug (132), a pull rod (133) and an elastic member (134), the valve chamber (131) being embedded in the siphon tube (1) and being configured as a chamber-like structure with openings at both ends along the direction of the siphon tube (1), the valve plug (132) being accommodated in the valve chamber (131) and being structurally matched with the valve plug (132). The valve chamber (131) is used to close any opening of the valve chamber (131); the pull rod (133) passes through the opening of the valve chamber (131) at one end away from the support section (11) and is connected to the valve plug (132); the elastic member (134) is connected between the valve plug (132) and any opening of the valve chamber (131) and is used to push the valve plug (132) to block or move away from any opening of the valve chamber (131).

3. The water injection device in the cofferdam as claimed in claim 2, characterized in that: One end of the pull rod (133) away from the valve plug (132) is connected to the electric winch (14) through a rope (141) and slides controllably with the rotation of the electric winch (14). The electric winch (14) is electrically connected to the controller.

4. The water injection device in the cofferdam as claimed in claim 3, characterized in that: The electric winch (14) is connected to the supporting section (11) of the siphon pipe (1), and the line (141) passes around a plurality of guide pulleys (15) connected to the siphon pipe (1).

5. The water injection device in the cofferdam according to claim 1, characterized in that: The energy system also includes a battery, which is used to store the electrical energy generated by the generator and release the electrical energy to the controller.

6. The water injection device in the cofferdam according to claim 1, characterized in that: The monitoring system further comprises a water level sensor, and the water level sensor is used for sensing the water level in the cofferdam.

7. The water injection device in the cofferdam according to claim 6, characterized in that: The plurality of water level sensors are arranged in a plurality of circles along the cofferdam and close to the inner wall of the cofferdam.

8. The water injection device in the cofferdam according to claim 1, characterized in that: The displacement sensors are arranged in a plurality of circles along the cofferdam and are arranged at the top of the cofferdam core.

9. The water injection device in the cofferdam according to claim 1, characterized in that: The controller includes a wireless transmission module for realizing information synchronization with the host.

10. The water injection device in the cofferdam according to claim 1, characterized in that: The siphon (1) is formed by assembling a plurality of detachably connected segmented pipes.

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