A foundation pit support structure and a construction method thereof

Abstract

The application discloses a kind of foundation pit support structure, comprising: support box, it is located in foundation pit, and side wall is equipped with water inlet hole;Accommodate drainage mechanism, it is equipped with the outside of support box, including: water inlet pipe, it is communicated with water inlet hole, the inlet end of water inlet pipe is equipped with check valve;Accommodation box body, it is communicated with the outlet end of water inlet pipe, and bottom is equipped with drainage pipe;Water plate, it is fixed in accommodation box body, and located below the outlet end of water inlet pipe, and water plate is equipped with drainage port;Limiting apron, it is covered in the lower side of drainage port, is rotated by rotating drive piece drive, when the water level in accommodation box body reaches preset water level, rotating drive piece starts, and drives limiting apron rotation, limiting apron is located in non-shielding drainage port state.The application is collected to rainwater by accommodation box body, and when rainfall is too large, by rotating limiting apron, adjust the area of drainage port being shielded, adjust drainage capacity, to reduce foundation pit drainage pressure.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology. More specifically, this invention relates to a foundation pit support structure and its construction method. Background Technology

[0002] An excavation pit is a pit dug at the foundation design location according to the base elevation and foundation plane dimensions. When the excavation is shallow, slope protection can be used to stabilize the soil slope, and the slope angle is determined according to the construction project specifications. When the excavation is deeper or there are buildings nearby, excavation pit wall support methods and shotcrete wall protection methods can be used to set up supporting structures to reinforce the stability of the pit wall. Large excavation pits may even use methods such as diaphragm walls and interlocking column-type bored piles to prevent the outer soil layer from collapsing.

[0003] Existing foundation pit support structures are prone to collapse during rainy weather when rainwater flows into the soil along the pit's edges. This increases the safety risks to the stability of the support structure. Patent application number 202110797096.9 discloses a foundation pit support structure including a support plate, a grooved guide plate fixedly connected to the upper end of the support plate, a box, a drive mechanism on the inner wall of the box, a lifting plate, and a reset mechanism on the inner wall of the box. The lower end of the reset mechanism is fixedly connected to the upper end of the lifting plate. A drainage mechanism is connected to the side wall of the box below the lifting plate, and a water suction mechanism is connected to the bottom of the box. While this can collect rainwater flowing into the pit from the ground, reducing the soaking effect of rainwater, the process of pumping water out of the box to the outside is too complex and time-consuming in cases of heavy rain. This increases the drainage pressure on the foundation pit, increasing the load on the support pit and making it unsuitable for long-term use.

[0004] Therefore, how to design the foundation pit support structure to solve the above-mentioned technical defects is a question worth considering. Summary of the Invention

[0005] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0006] To achieve these objectives and other advantages according to the present invention, a foundation pit support structure is provided, comprising:

[0007] A support box is located inside the foundation pit, and multiple water inlet holes are opened on the side wall of the support box in the horizontal direction;

[0008] A drainage receiving mechanism is disposed on the outside of the support box, and the drainage receiving mechanism includes:

[0009] Multiple water inlet pipes are connected to multiple water inlet holes, and a check valve is provided at the inlet end of each water inlet pipe.

[0010] The container is connected to the outlet end of the water inlet pipe, and a drain pipe is connected to the bottom of the container, which is connected to the external sewage pipe.

[0011] A water-passing plate is fixed inside the receiving box and located below the outlet end of the water inlet pipe. The water-passing plate has multiple drain outlets.

[0012] Multiple limiting shields are correspondingly installed on the lower side of multiple drain outlets and located below the water passage plate. The multiple limiting shields are driven to rotate by the same rotating drive component. When the water level in the container reaches the preset water level, the rotating drive component is activated and drives the limiting shields to rotate. The limiting shields are in a state where they do not cover the drain outlets.

[0013] Preferably, the water-passing plate has a circular hole;

[0014] The rotation drive component includes:

[0015] A limiting block is slidably disposed in the circular hole in the vertical direction. The limiting block has a frustum structure that is smaller at the top and larger at the bottom. The side wall of one end of the limiting cover plate abuts against the side wall of the limiting block.

[0016] Multiple fixed shafts are arranged around the circular hole on the water-passing plate, and the limiting cover plate passes through the fixed shafts;

[0017] A connecting rod, the lower end of which passes through the circular hole and is erected on the upper end of the limiting block, is provided with a float at the upper end of the connecting rod. When the water level in the container rises and contacts the float, the float moves vertically upward under the buoyancy of the water, the limiting block moves upward, and the limiting cover rotates.

[0018] Preferably, it also includes a reset component:

[0019] A threaded thread is provided on the lower side of the limiting cover;

[0020] A reset torsion spring is provided on the fixed shaft, and one end of the reset torsion spring is fixed to the threaded thread.

[0021] The diameter of the circular hole is not greater than the bottom diameter of the limiting block.

[0022] Preferably, a water pump is connected to the outlet end of the sewage pipe;

[0023] It also includes a water pump connector, which comprises:

[0024] A horizontal plate is disposed inside the receiving box and located above the float;

[0025] A lightweight rod has its lower end erected on the upper surface of the float, and its upper end passes through the horizontal plate and is provided with a connecting block;

[0026] A pair of photoelectric sensors are disposed on the two inner side walls of the housing. The photoelectric sensors and the connecting block in the initial state are on the same horizontal plane. The photoelectric sensors are connected to the water pump.

[0027] The water pump is turned on when the photoelectric sensor does not detect the connecting block.

[0028] Preferably, the bottom of the support box is provided with a plurality of bottom drainage holes spaced apart, the outlet end of the bottom drainage holes is connected to a drain pipe, the plurality of drain pipes are connected by a pipe, one end of the pipe is connected to the cavity located between the bottom of the receiving box and the water passage plate, and an electric valve is provided in the bottom drainage hole;

[0029] It also includes valve connecting parts, which include:

[0030] A metal layer is disposed on the upper side of the connecting block, and the metal layer is electrically connected to the electric valve;

[0031] A conductor layer is disposed on the top inner wall of the housing, and the conductor layer is connected to the power supply wires;

[0032] The distance from the horizontal plate to the top inner wall of the receiving box is not greater than the distance from the float to the horizontal plate. When the upper end of the lightweight rod contacts the top inner wall of the receiving box, the electric valve opens.

[0033] Preferably, the outer wall of the receiving box abuts against the side wall of the foundation pit;

[0034] It also includes a frustum-shaped annular transition plate, which is arranged around the top of the supporting box. The upper end of the annular transition plate abuts against the side wall of the pit top surface, wherein the receiving box is located below the annular transition plate.

[0035] Preferably, the limiting baffle is fan-shaped, with the tip of the fan blade abutting against the side wall of the limiting block.

[0036] Preferably, the drain outlet has a fan-shaped cross-section, and the drain outlet covers the gap between two adjacent limiting baffles when in the open state, and the area of ​​the drain outlet is not less than the area of ​​the gap.

[0037] A construction method for the aforementioned foundation pit support structure is provided, characterized by comprising the following steps:

[0038] Step 1: Install the water passage plate, rotation drive component, limit cover plate, reset component, water pump connecting component and valve connecting component into the container with the top opening, and then close the top of the container.

[0039] Step 2: Multiple bottom drainage holes are opened at the bottom of the support box, and a drain pipe is fixed to the bottom. Multiple drain pipes are connected through pipes. After the pipes are connected to the bottom of the container box, the drain pipe is connected to the sewage pipe.

[0040] Step 3: After connecting and fixing the water inlet pipe to the water inlet of the support box, hoist the support box and the housing box together into the foundation pit.

[0041] The present invention has at least the following beneficial effects:

[0042] First, by setting a water-passing plate, a limiting block, a limiting shield, and a rotation drive inside the housing, the present invention achieves the beneficial effect of rainwater collection when rainfall is low, and adjusts the shielding area of ​​the drainage outlet when rainfall is high, thereby adjusting the drainage volume to reduce the drainage pressure of the foundation pit, reduce the load on the supporting foundation pit, and facilitate long-term use.

[0043] Secondly, the present invention uses a water pump connector composed of a horizontal plate, a lightweight rod, a photoelectric sensor, and a connecting block to achieve real-time control of the water pump's opening and closing based on the water level inside the container.

[0044] Third, by setting up a valve connecting component composed of a metal layer and a conductor layer, the present invention controls the electric valve to discharge water from the bottom of the support box, thereby further reducing the drainage pressure of the foundation pit.

[0045] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0046] Figure 1 This is a side sectional view of the foundation pit support structure according to one of the technical solutions of the present invention;

[0047] Figure 2 for Figure 1 Enlarged view of structure A in the middle;

[0048] Figure 3 for Figure 1 Enlarged view of structure B in the middle;

[0049] Figure 4 This is a side view of the reset member according to one of the technical solutions of the present invention;

[0050] Figure 5 This is a top view of the water-passing plate according to one of the technical solutions of the present invention;

[0051] Figure 6 This is a bottom view of the water-passing plate according to one of the technical solutions of the present invention;

[0052] Figure 7 This is another bottom view of the water-passing plate according to one of the technical solutions of the present invention;

[0053] Figure 8 This is a top view of the support box according to one of the technical solutions of the present invention. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0055] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0056] like Figures 1-8 As shown, the present invention provides a foundation pit support structure, comprising:

[0057] A support box 2 is installed inside the foundation pit. Multiple water inlet holes 21 are horizontally provided on the side walls of the support box 2. The support box 2 can be made of lightweight concrete, stainless steel, or carbon steel. The top of the support box 2 is open, and its cross-sectional shape can be circular or rectangular. The support box 2 supports the side walls 1 of the foundation pit to prevent rainwater from entering the soil of the side walls 1, reducing the soaking of the foundation pit by rainwater and minimizing the possibility of collapse. The water inlet holes 21 are located near the bottom of the support box 2 to facilitate the collection and drainage mechanism 3 that collects and discharges water that falls into the support box 2. Water inlet holes 21 are provided on all four sides of the support box 2 for rapid rainwater collection.

[0058] A drainage receiving mechanism 3 is disposed on the outside of the support box 2, and the drainage receiving mechanism 3 includes:

[0059] Multiple water inlet pipes 31 are connected to multiple water inlet holes 21. The inlet end of each water inlet pipe 31 is equipped with a check valve. The water inlet pipe 31 can be horizontally arranged or inclined upward towards the inside of the support box 2. Preferably, the water inlet pipe 31 is inclined so that the water flow in the support box 2 generates a certain potential energy and is discharged through the water inlet pipe 31. The check valve helps to limit the flow of water so that water can only flow from the support box 2 to the water inlet pipe 31 and will not flow in the opposite direction.

[0060] The container 32 is connected to the outlet end of the water inlet pipe 31. The bottom of the container 32 is connected to a drain pipe 35, which is connected to an external sewage pipe. The container 32 can be made of lightweight concrete, stainless steel, or carbon steel, preferably lightweight concrete. Water in the support box 2 enters the container 32 through the water inlet 21 and the water inlet pipe 31, and then exits from the bottom of the container 32 through the drain outlet 332 and the drain pipe 35, and is discharged from the foundation pit through the sewage pipe to reduce the load of water on the support foundation pit.

[0061] A water-passing plate 33 is fixed inside the receiving tank 32 and located below the outlet end of the water inlet pipe 31. The water-passing plate 33 has multiple drain outlets 332, which are arranged in a circular pattern. The two sides of the water-passing plate 33 are fixed to the two side walls of the receiving tank 32 by welding. Water in the support box 2 enters the cavity between the water-passing plate 33 and the top of the receiving tank 32 through the water inlet hole 21 and the water inlet pipe 31, and is collected in the receiving tank 32. When the water level in the receiving tank 32 rises to a certain height, the drain outlets 332 on the water-passing plate 33 gradually open, and the water is discharged from the pit through the drain pipe 35 and the sewage pipe.

[0062] Multiple limiting baffles 34 are correspondingly installed on the lower sides of multiple drain outlets 332 and located below the water-passing plate 33. The multiple limiting baffles 34 are driven to rotate by the same rotating drive member 4. When the water level in the receiving tank 32 reaches a preset level, the rotating drive member 4 is activated, driving the limiting baffles 34 to rotate, and the limiting baffles 34 are in a state where they do not cover the drain outlets 332. Specifically, the rotating drive member 4 can be a rotary motor or a combination of a limiting block 41, a connecting rod 42, and a float. The system consists of 43 components. When the water level in the receiving tank 32 reaches a preset water level, the rotation drive 4 is activated and drives the limiting cover 34 to rotate. The limiting cover 34 is in a state where it does not cover the drain outlet 332. The drain outlet 332 is connected to the drain pipe 35 for drainage. The limiting cover 34 is driven to rotate by the rotation drive 4 to adjust the area of ​​the limiting cover 34 covering the drain outlet 332, thereby adjusting the diameter of the drain outlet 332 and regulating the drainage flow rate.

[0063] In the above technical solution, when rain occurs, rainwater falls into the support box 2 located in the foundation pit. When the water volume reaches a certain level, the water enters the receiving box 32 through the water inlet 21 and the water inlet pipe 31, and is collected in the receiving box 32 through the check valve. As the rainfall increases, the water volume in the receiving box 32 continuously increases. When the water level rises to a preset height, the rotation drive 4 is activated, the limiting baffle 34 rotates, the drain outlet 332 opens, and the water is discharged from the foundation pit through the drain pipe 35 and the sewage pipe. When the limiting baffle 34 rotates... When the angle reaches its maximum, the drain outlet 332 is not completely obstructed by the limiting cover 34; wherein, the support box 2 is used to support the pit sidewall 1 for its protection; the receiving box 32 is used to collect and store rainwater, and together with the support box 2, it prevents rainwater from entering the pit from the pit sidewall 1, reduces the soaking of the pit by rainwater, and thus reduces the collapse of the pit due to rainwater soaking; the limiting cover 34, driven by the rotating drive 4, adjusts the covering area of ​​the drain outlet 332, adjusts the drainage volume, reduces the drainage pressure of the pit, reduces the load on the supporting pit, and is beneficial for long-term use.

[0064] In another technical solution, the water-passing plate 33 is provided with a circular hole 331; specifically, the circular hole 331 is located at the center of multiple drainage holes, so that multiple limiting baffles 34 can rotate around the circular hole 331 to limit and cover multiple drainage outlets 332.

[0065] The rotation drive component 4 includes:

[0066] A limiting block 41 is slidably disposed within the circular hole 331 in a vertical direction. The limiting block 41 has a frustum structure that is smaller at the top and larger at the bottom. The side wall of one end of the limiting cover plate 34 abuts against the side wall of the limiting block 41. Specifically, the limiting block 41 can be made of lightweight materials such as plastic or rubber. The end of the limiting cover plate 34 that abuts against the limiting block 41 is arc-shaped. By controlling the limiting block 41 to slide in a vertical direction, the rotation angle of the limiting cover plate 34 can be adjusted. When the limiting block 41 moves upward, the diameter of the cross-section of the limiting block 41 in contact with the limiting cover plate 34 continuously increases, causing the limiting cover plate 34 to rotate.

[0067] Multiple fixed shafts 44 are arranged around the circular hole 331 on the water-passing plate 33. The limiting cover plate 34 passes through the fixed shaft 44. One end of the fixed shaft 44 can be vertically fixed to the lower side of the water-passing plate 33 by welding. The other end of the fixed shaft 44 can be fixed with a nut to prevent the limiting cover plate 34 from disengaging from the fixed shaft 44 when rotating, thereby losing its shielding function for the drain outlet 332 and thus losing its function of adjusting the drainage volume.

[0068] A connecting rod 42, the lower end of which passes through the circular hole 331 and is erected on the upper end of the limiting block 41, has a float 43 at the upper end of the connecting rod 42. When the water level in the receiving tank 32 rises and contacts the float 43, the float 43 moves vertically upward under the action of buoyancy, the limiting block 41 moves upward, and the limiting cover 34 rotates. Specifically, the connecting rod 42 can be made of lightweight materials such as plastic or rubber. As the water volume in the receiving tank 32 increases and the water level rises, the water contacts the float 43, generating buoyancy. As the volume of the float 43 immersed in the water increases, the buoyancy on the float 43 increases, and the buoyancy drives the connecting rod 42 and the limiting block 41 to move vertically upward.

[0069] In the above technical solution, the limiting baffle 34 is fixed to the water-passing plate 33 in a spiral shape via the fixed shaft 44. The limiting block 41 is always in contact with the limiting baffle 34. In the initial state, the limiting baffle 34 will have the largest covering area for the drain outlet 332. As the amount of rainwater collected in the receiving box 32 increases, the water contacts the float 43, generating buoyancy. As the water level rises, the volume of the float 43 submerged in water increases. The limiting block 41 moves upward under the drive of the float 43 and the connecting rod 42. When it contacts the limiting baffle 34, it decomposes the buoyancy into a lateral thrust, pushing the limiting baffle 34 to rotate and open around the fixed shaft 44. The greater the buoyancy, the larger the diameter of the contact surface between the limiting block 41 and the limiting baffle 34, and the greater the degree of opening and closing of the limiting baffle 34, until the contact point is the maximum lateral diameter of the frustum-shaped limiting block 41. In the cross-section, the drain outlet 332 is fully open. At this time, the drain outlet 332 is no longer affected by the limiting baffle 34, and the drainage volume reaches its maximum, so that the water accumulated in the receiving box 32 and the support box 2 can be quickly discharged. The rotating drive 4, under the action of buoyancy, has the function of adjusting the diameter of the drain outlet 332, avoiding excessive accumulation of rainwater in the receiving box 32, reducing the load on the support pit, and reducing the drainage pressure of the pit. When the water level drops, the float 43 drives the limiting block 41 to move downward due to gravity. At this time, the limiting baffle 34 gradually returns to its initial state under the action of the reset component 7, gradually returning from the fully open state to the closed state. Therefore, the rotation amplitude of the limiting baffle 34 can be adjusted at any time according to the amount of water in the receiving box 32, controlling the diameter of the drain outlet 332 connected to the drain pipe 35 to solve the drainage backlog problem.

[0070] In another technical solution, a reset component 7 is also included:

[0071] A threaded buckle 71 is provided on the lower side of the limiting cover plate 34; specifically, the threaded buckle 71 is fixedly provided on the lower side of the limiting cover plate 34 by welding or screwing, so as to facilitate the connection of the reset torsion spring 72 described below.

[0072] A reset torsion spring 72 is disposed on the fixed shaft 44, and one end of the reset torsion spring 72 is fixed to the threaded buckle 71. Specifically, the reset torsion spring 72 can store and release angular energy or statically fix a device by rotating a lever arm around the central axis of the spring body. One end of the reset torsion spring 72 is wound around the fixed shaft 44, and the other end is fixed to the threaded buckle 71. The reset torsion spring 72 connects the threaded buckle 71 and the fixed shaft 44 with a certain torsion angle.

[0073] Wherein, the diameter of the circular hole 331 is not greater than the bottom diameter of the limiting block 41; specifically, the diameter of the circular hole 331 is less than or equal to the bottom diameter of the limiting block 41, preferably equal to the bottom diameter of the limiting block 41, the bottom diameter being the diameter of the largest cross-section of the limiting block 41 with the frustum structure. When the limiting block 41 rises to its maximum position, the diameter of the limiting block 41 is equal to the diameter of the circular hole 331, and the limiting block 41 is locked in the circular hole 331. If the diameter of the circular hole 331 is greater than the bottom diameter of the limiting block 41, when the limiting block 41 continues to move upward, the limiting block 41 may be unable to move downward.

[0074] In the above technical solution, the diameter of the circular hole 331 and the limiting block 41 is set so that when the floating block 43 moves upward under the action of buoyancy, the limiting block 41 is limited and locked in the circular hole 331, instead of continuing to move upward and disengaging from the circular hole 331. This is not conducive to the limiting block 41 resetting for repeated drainage work. The resetting function of the resetting member 7 is realized by the resetting torsion spring 72 set on the fixed shaft 44. One end of the resetting torsion spring 72 is connected to the limiting cover plate 34 through the threaded buckle 71. The limiting cover plate 34 is subjected to the torsion spring force. When the limiting block sinks under the gravity of the rotating drive member 4, the limiting cover plate 34 can return to the initial state under the action of the resetting torsion spring 72, that is, the limiting cover plate 34 is fully closed.

[0075] In another technical solution, a water pump is connected to the outlet end of the sewage pipe; the water pump is an electric water pump, which can be a centrifugal pump, a self-priming pump or a deep well pump, preferably a self-priming pump. When the water pump is started, the water pump generates suction and automatically draws in water from the sewage pipe. The water pump can be equipped with a controller.

[0076] It also includes a water pump connector 5, which comprises:

[0077] A horizontal plate 51 is disposed inside the receiving box 32 and located above the float 43. Specifically, the horizontal plate 51 may be made of stainless steel or plastic. The horizontal plate 51 is fixedly disposed inside the receiving box 32 by welding and located above the float 43. The horizontal plate 51 may have through holes so that the lightweight rod 53 described below can pass through.

[0078] A lightweight rod 53 has its lower end erected on the upper surface of the float 43. The upper end of the lightweight rod 53 passes through the horizontal plate 51 and is provided with a connecting block 54. Specifically, the lightweight rod 53 can be made of plastic or rubber. The lightweight rod 53 is fixed to the upper side of the float 43 with glue. The upper end of the lightweight rod 53 passes through the horizontal plate 51 through a through hole. When in the initial state, the lower side 54 of the connecting block is in contact with the upper side of the horizontal plate 33.

[0079] A pair of photoelectric sensors 52 are disposed on the two inner side walls of the housing 32. The photoelectric sensors 52 and the connecting block 54 in the initial state are on the same horizontal plane. The photoelectric sensors 52 are signal-connected to the water pump. The photoelectric sensors 52 are connected to the controller of the water pump via wireless signal or via wire. In the initial state, the connecting block 54 abuts against the upper side of the horizontal plate 51. The connecting block 54 and the photoelectric sensors 52 are on the same horizontal plane. The photoelectric sensors 52 sense the connecting block 54, and the water pump is in a power-off state and does not work.

[0080] Specifically, when the photoelectric sensor 52 does not detect the connecting block, the water pump is turned on. When the float 43 rises under the buoyancy of the water, the lightweight rod 53 moves upward together, causing the connecting block 54 to separate from the horizontal plate 51. When the photoelectric sensor 52 does not detect the connecting block 54, the photoelectric sensor 52 is connected to the controller located on the water pump via a signal, so that the water pump is energized and turned on.

[0081] In the above technical solution, when the water in the container 32 does not generate buoyancy on the float 43, the connecting block 54 abuts against the horizontal plate 51, the photoelectric sensor 52 senses the connecting block 54, the receiver of the photoelectric sensor 52 cannot receive the light beam emitted by the transmitter, the photoelectric sensor 52 is not connected to the controller signal of the water pump, the water pump is in a de-energized state, and the water pump has not started working; when the water level in the container 32 rises continuously, the resulting buoyancy causes the float 43 to move. When the lightweight rod 53 moves upward, causing the connecting block 54 to separate from the horizontal plate 51, the photoelectric sensor 52 senses the connecting block 54. The receiver of the photoelectric sensor 52 receives the light beam emitted by the transmitter. The photoelectric sensor 52 is connected to the controller signal of the water pump, and the water pump is in a powered state. The water pump starts working and pumps the water in the sewage pipe out of the pit. The water pump connector 5 enables the water level in the receiving tank 32 to control the opening and closing of the water pump in real time.

[0082] In another technical solution, the bottom of the support box 2 is provided with a plurality of bottom drainage holes 22 at intervals. The water outlet of the bottom drainage hole 22 is connected to a drain pipe 9. The plurality of drain pipes 9 are connected through a pipe 10. One end of the pipe 10 is connected to the cavity located between the bottom of the receiving box 32 and the water passage plate 33. An electric valve is provided in the bottom drainage hole 22. Specifically, the electric valve is controlled by the valve connecting part 6 described below to realize opening and closing. See the following for details. When the electric valve is in the open state, the remaining water in the support box 2 enters the drain pipe 9 and the pipe 10 through the bottom drainage port 332 and is discharged into the cavity between the bottom of the receiving box 32 and the water passage plate 33. The water is then discharged from the pit through the drain pipe 35 and the water pump.

[0083] It also includes a valve connector 6, which comprises:

[0084] A metal layer 61 is disposed on the upper side of the connecting block 54, and the metal layer 61 is electrically connected to the electric valve; specifically, the metal layer 61 can be made of iron, steel or copper to have electrical conductivity.

[0085] A conductor layer 62 is disposed on the top inner wall of the housing 32, and the conductor layer 62 is connected to the power supply wires; specifically, the conductor layer 62 can be fixed to the top inner wall of the housing 32 with glue, and the conductor layer 62 is connected to the power supply wires so that the power supply can supply power to the electric valve by contacting the metal layer 61.

[0086] The distance from the horizontal plate 51 to the top inner wall of the receiving box 32 is not greater than the distance from the float 43 to the horizontal plate 51. When the upper end of the lightweight rod 53 contacts the top inner wall of the receiving box 32, the electric valve opens. Specifically, the distance between the horizontal plate 51 and the top of the receiving box 32, and the initial distance between the float 43 and the horizontal plate 51, are set such that when the float 43 abuts against the horizontal plate 51, the valve connector 6 is in the open state. When the upper end of the lightweight rod 53 contacts the top inner wall of the receiving box 32, the electric valve opens, and the water in the support box 2 is discharged into the drain pipe through the bottom drain hole 22.

[0087] In the above technical solution, when the rainfall is too heavy and the drainage outlet 332 still cannot alleviate the water accumulation problem in the support box 2, the float 43 continues to move upward under the buoyancy of the water, and the lightweight rod 53 drives the metal layer 61 to move upward. When the metal layer 61 contacts the conductor layer 62 on the inner side of the top of the receiving box 32, the valve connector 6 is in the open state, the electric valve is opened, and the water in the support box 2 is discharged into the sewage pipe through the bottom drainage hole 22 to further discharge the water at the bottom of the support box 2 and further reduce the drainage pressure of the foundation pit.

[0088] In another technical solution, the outer wall of the receiving box 32 abuts against the side wall 1 of the foundation pit;

[0089] It also includes a frustum-shaped annular transition plate 8, which is arranged around the top of the support box 2. The upper end of the annular transition plate 8 abuts against the side wall of the pit top surface. The receiving box 32 is located below the annular transition plate 8. The outer side wall of the receiving box 32 abuts against the pit side wall 1 to support the pit, reduce rainwater entry from the pit side wall 1, and reduce the possibility of pit collapse. The annular transition plate 8 is arranged around the top of the support box 2. Due to its frustum-shaped structure, it facilitates water from the ground to enter the support box 2 through the annular transition plate 8. The receiving box 32 is located below the annular transition plate 8 to prevent water from entering the pit from between the receiving box 32 and the pit side wall 1.

[0090] In another technical solution, the limiting baffle 34 is fan-shaped, with the tip of the fan blade abutting against the side wall of the limiting block 41; wherein, the tip of the fan-shaped limiting baffle 34 is arc-shaped, and the limiting block 41 contacts the arc edge at the acute angle. As the limiting block 41 moves upward, the limiting block 41 and the arc edge move relative to each other, and the limiting baffle 34 rotates around the fixed axis 44, thereby opening the limiting baffle 34 and realizing the unfolding of the limiting baffle 34. Conversely, when the limiting block 41 moves downward, the limiting baffle 34 closes.

[0091] In another technical solution, the drain outlet 332 has a fan-shaped cross-section and covers the gap between two adjacent limiting baffles 34 when in the open state. The area of ​​the drain outlet 332 is not less than the area of ​​the gap. The arrangement of the area of ​​the drain outlet 332 and the gap ensures that the drainage capacity of the drain outlet 332 is maximized when the limiting baffles 34 are fully open. Therefore, the drain outlet 332 is positioned directly above the gap between two adjacent limiting baffles 34 after the limiting baffles 34 are fully open, and its area and shape must cover the gap after it is fully open to maximize the drainage capacity of the drain outlet 332, thereby preventing water from putting pressure on the receiving box 32 and reducing the load on the supporting pit.

[0092] A construction method for the aforementioned foundation pit support structure is provided, characterized by comprising the following steps:

[0093] Step 1: Install the water-passing plate 33, the rotation drive component 4, the limiting cover plate 34, the reset component 7, the water pump connecting component 5, and the valve connecting component 6 into the top-opening receiving box 32, and then seal the top of the receiving box 32. Specifically, the top-opening receiving box 32 is prefabricated in the prefabrication yard, and the prefabricated water-passing plate 33, the rotation drive component 4, the limiting cover plate 34, the reset component 7, the water pump connecting component 5, and the valve connecting component 6 are installed into the receiving box 32. Then, the top of the receiving box 32 is sealed by welding or screwing.

[0094] Step 2: A plurality of bottom drainage holes 22 are opened at the bottom of the support box 2, and a drain pipe 9 is fixed to the bottom. The plurality of drain pipes 9 are connected through a pipe 10. After the pipe 10 is connected to the lower end of the receiving box 32, the drain pipe 35 is connected to the sewage pipe. A plurality of bottom drainage holes 22 are drilled at the bottom of the prefabricated support box 2 with a top opening. The drain pipe and the pipe 10 are installed and fixed at the bottom corresponding to the bottom drainage holes 22. The support box 2 and the receiving box 32 are connected by the pipe 10 and then connected to the sewage pipe.

[0095] Step 3: After connecting and fixing the water inlet pipe 31 to the water inlet of the support box 2, hoist the support box 2 and the receiving box 32 together into the foundation pit; place the receiving box 32 on the outside of the support box 2 through the water inlet pipe 31 to connect the support box 2 and the receiving box 32, and then hoist the support box 2 and the receiving box 32 together into the foundation pit so that in rainy weather, the foundation pit support structure can not only support the foundation pit, but also collect rainwater in the support box 2, and adjust the drainage volume in real time to reduce the drainage pressure of the foundation pit.

[0096] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A foundation pit support structure, characterized in that, include: A support box is located inside the foundation pit, and multiple water inlet holes are opened on the side wall of the support box in the horizontal direction; A drainage receiving mechanism is disposed on the outside of the support box, and the drainage receiving mechanism includes: Multiple water inlet pipes are connected to multiple water inlet holes, and a check valve is provided at the inlet end of each water inlet pipe. The container is connected to the outlet end of the water inlet pipe, and a drain pipe is connected to the bottom of the container, which is connected to the external sewage pipe. A water-passing plate is fixed inside the receiving box and located below the outlet end of the water inlet pipe. The water-passing plate has multiple drain outlets and round holes. Multiple limiting shields are correspondingly covered on the lower side of multiple drain outlets and located below the water passage plate. The multiple limiting shields are driven to rotate by the same rotating drive component. When the water level in the container reaches the preset water level, the rotating drive component is activated and drives the limiting shields to rotate. The limiting shields are in a state where they do not cover the drain outlets. The rotation drive component includes: A limiting block is slidably disposed in the circular hole in the vertical direction. The limiting block has a frustum structure that is smaller at the top and larger at the bottom. The side wall of one end of the limiting cover plate abuts against the side wall of the limiting block. Multiple fixed shafts are arranged around the circular hole on the water-passing plate, and the limiting cover plate passes through the fixed shafts; A connecting rod, the lower end of which passes through the circular hole and is erected on the upper end of the limiting block, is provided with a float at the upper end of the connecting rod. When the water level in the container rises and contacts the float, the float moves vertically upward under the buoyancy of the water, the limiting block moves upward, and the limiting cover rotates. The outlet end of the sewage pipe is connected to a water pump; It also includes a water pump connector, which comprises: A horizontal plate is disposed inside the receiving box and located above the float; A lightweight rod has its lower end erected on the upper surface of the float, and its upper end passes through the horizontal plate and is provided with a connecting block; A pair of photoelectric sensors are disposed on the two inner side walls of the housing. The photoelectric sensors and the connecting block in the initial state are on the same horizontal plane. The photoelectric sensors are connected to the water pump. The water pump is turned on when the photoelectric sensor does not detect the connecting block. The bottom of the support box is provided with multiple bottom drainage holes spaced apart. The outlet end of each bottom drainage hole is connected to a drain pipe. The multiple drain pipes are connected by a pipe. One end of the pipe is connected to the cavity located between the bottom of the receiving box and the water passage plate. An electric valve is provided in each bottom drainage hole. It also includes valve connecting parts, which include: A metal layer is disposed on the upper side of the connecting block, and the metal layer is electrically connected to the electric valve; A conductor layer is disposed on the top inner wall of the housing, and the conductor layer is connected to the power supply wires. The distance from the horizontal plate to the top inner wall of the receiving box is not greater than the distance from the float to the horizontal plate. When the upper end of the lightweight rod contacts the top inner wall of the receiving box, the electric valve opens.

2. The foundation pit support structure as described in claim 1, characterized in that, It also includes a reset component: A threaded thread is provided on the lower side of the limiting cover; A reset torsion spring is provided on the fixed shaft, and one end of the reset torsion spring is fixed to the threaded thread. The diameter of the circular hole is not greater than the bottom diameter of the limiting block.

3. The foundation pit support structure as described in claim 1, characterized in that, The outer wall of the accommodating box abuts against the side wall of the foundation pit; It also includes a frustum-shaped annular transition plate, which is arranged around the top of the supporting box. The upper end of the annular transition plate abuts against the side wall of the pit top surface, wherein the receiving box is located below the annular transition plate.

4. The foundation pit support structure as described in claim 1, characterized in that, The limiting baffle is fan-shaped, and the tip of the fan blade abuts against the side wall of the limiting block.

5. The foundation pit support structure as described in claim 4, characterized in that, The drain outlet has a fan-shaped cross-section and covers the gap between two adjacent limiting baffles when in the open state. The area of ​​the drain outlet is not less than the area of ​​the gap.

6. The construction method of the foundation pit support structure as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Install the water passage plate, rotation drive component, limit cover plate, reset component, water pump connecting component and valve connecting component into the container with the top opening, and then close the top of the container. Step 2: Multiple bottom drainage holes are opened at the bottom of the support box, and a drain pipe is fixed to the bottom. Multiple drain pipes are connected through pipes. After the pipes are connected to the bottom of the container box, the drain pipe is connected to the sewage pipe. Step 3: After connecting and fixing the water inlet pipe to the water inlet of the support box, hoist the support box and the housing box together into the foundation pit.

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