A deep foundation pit protection structure

Abstract

The present invention relates to the technical field of foundation pit protection, and discloses a deep foundation pit protection structure, including: a steel mesh cavity; a collecting component, the collecting component including a blanking funnel fixedly arranged at the bottom end of the steel mesh cavity, and a blanking pipe fixedly arranged at the bottom end of the blanking funnel, and a blanking valve arranged on the surface of the blanking pipe; a discharge component, which is used to automatically discharge the soil inside the blanking funnel and the blanking pipe after opening the blanking valve. By setting the discharge component, two push plates can push the soil in the blanking funnel to the middle, avoiding the soil from clogging inside the blanking funnel, thereby improving the discharge efficiency, and at the same time, it can drive the spiral conveying blade to rotate inside the blanking pipe, so that the soil in the blanking funnel can automatically enter the blanking pipe, and the soil in the blanking pipe can be automatically discharged, thereby further improving the discharge efficiency, and effectively solving the problem that the soil is easy to clog the blanking funnel and the blanking pipe during discharge.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit protection, and more specifically, to a deep foundation pit protection structure. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. After the foundation pit is excavated, a protective structure is needed to protect the slope of the foundation pit.

[0003] A patent application with the announcement number CN113653070A discloses a deep foundation pit slope protection structure, including: a steel mesh cavity, the lower mesh surface of which is arranged close to the slope surface of the foundation pit slope body; a switch interface is used to control whether the scattered soil in the steel mesh cavity is out of the steel mesh cavity; a moving device is used to push the receiving container to move horizontally at the bottom of the pit of the foundation pit slope body so that the receiving container is located directly below the switch interface, or so that the receiving container is far away from the switch interface; a lifting device is used to lift and move the receiving container and the moving device between the top and the bottom of the foundation pit slope body at the same time. When there is a lot of soil scattered on the slope surface, part of the scattered soil falls into the steel mesh cavity, and the receiving container is transferred to the top of the foundation pit through the moving device and the lifting device, thereby ensuring that most of the scattered soil does not randomly scatter into the foundation pit, and reducing the pressure on the lower mesh surface to a certain extent, that is, the service life of the lower mesh surface is increased and the inconvenience caused by replacing the steel mesh is avoided.

[0004] In the technical solution proposed by the above patent technology, when the soil on the slope of the foundation pit falls into the steel mesh cavity and slides along the steel mesh cavity into the funnel pipe and the down pipe for temporary storage, during the temporary storage process, the soil will pile up inside the funnel pipe and the down pipe. During the process of opening the valve for discharge, it is difficult for the soil to automatically fall down from the inside of the funnel pipe and the down pipe. Over time, the funnel pipe and the down pipe will be blocked, reducing the efficiency of discharge.

[0005] To this end, the present invention provides a deep foundation pit protection structure. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The present invention provides a deep foundation pit protection structure, comprising: Steel mesh cavity; A collecting assembly, which is used to guide and collect the soil falling from the middle of the steel mesh cavity, the collecting assembly comprises a dropping funnel fixedly arranged at the bottom end of the steel mesh cavity, a dropping pipe fixedly arranged at the bottom end of the dropping funnel, and a dropping valve arranged on the surface of the dropping pipe; A discharge assembly is used to automatically discharge the soil inside the blanking funnel and the blanking pipe after the blanking valve is opened. The discharge assembly includes two symmetrical push plates slidably arranged on the inner wall of the blanking funnel, and a connecting box fixedly arranged on the inner wall of the steel mesh cavity. The inner top wall of the connecting box is rotatably provided with a rotating rod extending to the lower surface of the connecting box and extending to the inside of the blanking pipe, and a spiral conveying blade is fixedly arranged on the surface of the rotating rod. The discharge assembly also includes a driving motor for driving the two push plates to move toward the middle at the same time and driving the rotating rod to rotate.

[0008] Preferably, the steel mesh cavity includes a lower mesh surface and an upper mesh surface, and the lower mesh surface is arranged closely against the slope surface of the foundation pit slope, and the upper mesh surface is fixed to the upper surface of the lower mesh surface by means of mounting columns, and the aperture of the holes on the upper mesh surface is smaller than the aperture of the holes on the lower mesh surface, so that scattered soil can penetrate the lower mesh surface into the interior of the steel mesh cavity and be limited under the action of the upper mesh surface.

[0009] Preferably, a rectangular box is fixedly provided on the front side of the steel mesh cavity, and the drive motor is fixedly provided on the outer surface of the rectangular box, the output end of the drive motor extends to the interior of the rectangular box and is fixedly provided with a rotating shaft, the outer surface of the rotating shaft is provided with two symmetrical reciprocating screws, mounting holes are provided at both ends of the reciprocating screws, the inner wall of the mounting hole is fixedly connected to the outer surface of the rotating shaft, and the two reciprocating screws can be driven to rotate simultaneously by the rotation of the drive motor.

[0010] Preferably, two symmetrical movable plates are slidably provided on the inner wall of the rectangular box, and the sides of the two movable plates are provided with threaded holes threadedly connected to the outer surface of the reciprocating screw, so that the movable plates can be driven to reciprocate by the rotation of the reciprocating screw.

[0011] Preferably, two symmetrical limit rods are fixedly provided on the inner walls on both sides of the rectangular box, and limit blocks are fixedly provided on the ends of the four limit rods, and limit sliding holes for the two limit rods to slide are opened on the sides of the two movable plates, which effectively improves the stability of the two movable plates when they move back and forth.

[0012] Preferably, an L-shaped connecting rod is fixedly provided on the lower surface of the two movable plates, and the ends of the two L-shaped connecting rods away from the movable plates are fixedly connected to the upper surfaces of the two push plates respectively, and the back side of the rectangular box and the front side of the steel mesh cavity are provided with strip openings for the L-shaped connecting rods to slide, which can be driven to move back and forth by the reciprocating movement of the movable plates and under the action of the L-shaped connecting rods.

[0013] Preferably, a rectangular cavity is formed on the lower surface of the push plate, and an extension plate is slidably provided on the inner wall of the rectangular cavity. The inner bottom wall of the blanking funnel is an inclined symmetrical structure. The bottom ends of the two extension plates are provided with inclined surfaces that match the inner bottom wall of the blanking funnel, and the bottom ends of the extension plates are slidably connected to the inner bottom wall of the blanking funnel, so that the dirt on the inner bottom wall of the blanking funnel can be effectively cleaned under the action of the extension plates.

[0014] Preferably, a plurality of clamping springs are equidistantly fixed on the upper surface of the extension plate, and the ends of the plurality of clamping springs away from the extension plate are fixedly connected to the inner top wall of the rectangular cavity, and an elastic material blocking cloth is fixedly provided on the top outer surface of the push plate, and the end of the elastic material blocking cloth away from the push plate is fixedly connected to the inner wall of the steel mesh cavity, so that the elastic material blocking cloth can prevent soil from falling into the other side of the push plate during the movement of the push plate.

[0015] Preferably, a semicircular material-blocking column is fixedly provided on the upper surface of the connection box, and the semicircular material-blocking column is made of solid steel, which can prevent soil from accumulating on the upper surface of the connection box under the action of the semicircular material-blocking column.

[0016] Preferably, a connecting shaft is rotatably provided on the back side of the rectangular box, and one end of the connecting shaft extends to the interior of the rectangular box and is fixedly provided with a first driven bevel gear, a surface of the rotating shaft is fixedly provided with a first active bevel gear that meshes with the first driven bevel gear, the other end of the connecting shaft extends to the interior of the connecting box and is fixedly provided with a second active bevel gear, and a surface of the rotating rod is fixedly provided with a second driven bevel gear that meshes with the second active bevel gear, which can drive the rotating rod to rotate automatically through the rotation of the rotating shaft.

[0017] The beneficial effects of the present invention are as follows: the deep foundation pit protection structure described in the present invention is through.

[0018] The deep foundation pit protection structure described in the present invention is provided with a steel mesh cavity and a collecting component, so that during actual use, the soil falling from the slope of the deep foundation pit can pass through the lower mesh surface into the interior of the steel mesh cavity, and fall into the drop funnel and the drop pipe for collection under the action of the upper mesh surface limiting, thereby ensuring that most of the scattered soil is not scattered into the foundation pit at will, reducing the pressure on the lower mesh surface to a certain extent, that is, improving the service life of the lower mesh surface and avoiding the inconvenience caused by replacing the steel mesh.

[0019] The deep foundation pit protection structure described in the present invention is provided with a discharge component. When it is necessary to discharge the soil temporarily stored in the discharge hopper and the discharge pipe, the discharge valve can be opened and the driving motor can be started, so that the two push plates push the soil in the discharge hopper to the middle, avoiding the clogging of the soil inside the discharge hopper, thereby improving the discharge efficiency. At the same time, it can drive the spiral conveying blades to rotate inside the discharge pipe, so that the soil in the discharge hopper can automatically enter the discharge pipe and the soil in the discharge pipe can be automatically discharged, thereby further improving the discharge efficiency and effectively solving the problem that the soil is easy to clog the discharge funnel and the discharge pipe during discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the top-down section structure of a rectangular box of the present invention; Figure 3 yes Figure 2 The enlarged structural diagram at A in the middle; Figure 4 It is the internal structure and schematic diagram of the rectangular box and the blanking funnel of the present invention; Figure 5 The present invention Figure 4 The enlarged structural diagram at B in the middle; Figure 6 It is a schematic diagram of the rear cross-sectional structure of the present invention; Figure 7 The present invention Figure 6 Enlarged structural diagram at point C in the middle.

[0021] In the figure: 100, steel mesh cavity; 101, lower mesh surface; 102, upper mesh surface; 200, collecting assembly; 201, material dropping funnel; 202, material dropping pipe; 203, material dropping valve; 300, discharging assembly; 301, push plate; 302, connecting box; 303, rotating rod; 304, spiral conveying blade; 305, driving motor; 306, rectangular box; 307, rotating shaft; 308, reciprocating screw; 309, moving plate; 3010, limiting rod; 3011, L-shaped connecting rod; 3012, strip opening; 3013, extension plate; 3014, holding spring; 3015, elastic material blocking cloth; 3016, semicircular material blocking column; 3017, connecting shaft; 3018, first driven bevel gear; 3019, first active bevel gear; 3020, second active bevel gear; 3021, second driven bevel gear. DETAILED DESCRIPTION

[0022] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0023] Embodiment 1 like Figures 1 to 7 As shown, a deep foundation pit protection structure according to an embodiment of the present invention is shown in FIG. Figure 1 ,include: Steel mesh cavity 100; The collecting assembly 200 is used to guide and collect the soil dropped from the middle of the steel mesh cavity 100. The collecting assembly 200 includes a drop funnel 201 fixedly arranged at the bottom end of the steel mesh cavity 100, and a drop pipe 202 is fixedly arranged at the bottom end of the drop funnel 201, and a drop valve 203 is arranged on the surface of the drop pipe 202; Please refer to Figure 1 The steel mesh cavity 100 includes a lower mesh surface 101 and an upper mesh surface 102, and the lower mesh surface 101 is arranged close to the slope of the foundation pit slope, and the upper mesh surface 102 is fixed on the upper surface of the lower mesh surface 101 through mounting columns, and the aperture of the holes on the upper mesh surface 102 is smaller than the aperture of the holes on the lower mesh surface 101.

[0024] Specifically, by providing the upper mesh surface 102 and the lower mesh surface 101 , the scattered soil can penetrate the lower mesh surface 101 into the interior of the steel mesh cavity 100 and be limited by the upper mesh surface 102 .

[0025] In this embodiment, by providing the steel mesh cavity 100 and the collecting assembly 200, the protective structure can allow the soil that falls from the slope of the deep foundation pit to pass through the lower mesh surface 101 into the interior of the steel mesh cavity 100 during actual use, and fall into the drop funnel 201 and the drop pipe 202 for collection under the limiting action of the upper mesh surface 102, thereby ensuring that most of the scattered soil is not scattered into the foundation pit at will, and reducing the pressure on the lower mesh surface 101 to a certain extent, that is, increasing the service life of the lower mesh surface 101 and avoiding the inconvenience caused by replacing the steel mesh.

[0026] Embodiment 2 Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7Based on the first embodiment and different from the first embodiment, a deep foundation pit protection structure further includes: The discharge component 300 is used for automatically discharging the soil inside the blanking funnel 201 and the blanking tube 202 after opening the blanking valve 203. The discharge component 300 includes two symmetrical push plates 301 slidably arranged on the inner wall of the blanking funnel 201, and a connecting box 302 fixedly arranged on the inner wall of the steel mesh cavity 100. The inner top wall of the connecting box 302 is rotatably provided with a rotating rod 303 extending to the lower surface of the connecting box 302 and extending to the inside of the blanking tube 202, and a spiral conveying blade 304 is fixedly arranged on the surface of the rotating rod 303. The discharge component 300 also includes a driving motor 305 for driving the two push plates 301 to move toward the middle at the same time and driving the rotating rod 303 to rotate.

[0027] Please refer to Figure 3 , Figure 5 A rectangular box 306 is fixedly provided on the front of the steel mesh cavity 100, and a driving motor 305 is fixedly provided on the outer surface of the rectangular box 306. The output end of the driving motor 305 extends to the inside of the rectangular box 306 and is fixedly provided with a rotating shaft 307. Two symmetrical reciprocating screws 308 are provided on the outer surface of the rotating shaft 307. Mounting holes are opened at both ends of the reciprocating screws 308, and the inner wall of the mounting hole is fixedly connected to the outer surface of the rotating shaft 307.

[0028] Specifically, by providing the rotating shaft 307 and the reciprocating screw 308 , the two reciprocating screws 308 can be driven to rotate simultaneously by the rotation of the driving motor 305 .

[0029] Please refer to Figure 3 , Figure 5 Two symmetrical moving plates 309 are slidably arranged on the inner wall of the rectangular box 306 , and threaded holes threadedly connected to the outer surface of the reciprocating screw 308 are opened on the sides of the two moving plates 309 .

[0030] Specifically, by providing the threaded hole, the reciprocating screw 308 can be rotated to drive the moving plate 309 to move back and forth.

[0031] Please refer to Figure 3 Two symmetrical limiting rods 3010 are fixedly provided on the inner walls of both sides of the rectangular box 306, and limiting blocks are fixedly provided on the ends of the four limiting rods 3010, and limiting sliding holes for the two limiting rods 3010 to slide are opened on the sides of the two movable plates 309.

[0032] Specifically, by providing the limiting rod 3010 , the stability of the moving plate 309 can be effectively guaranteed during the movement of the moving plate 309 .

[0033] Please refer to Figure 3An L-shaped connecting rod 3011 is fixedly provided on the lower surface of the two movable plates 309, and the ends of the two L-shaped connecting rods 3011 away from the movable plates 309 are fixedly connected to the upper surfaces of the two push plates 301 respectively, and the back side of the rectangular box 306 and the front side of the steel mesh cavity 100 are provided with a strip opening 3012 for the L-shaped connecting rod 3011 to slide.

[0034] Specifically, the L-shaped connecting rod 3011 can drive the L-shaped connecting rod 3011 to move through the movement of the moving plate 309 , thereby driving the two push plates 301 to move synchronously with the moving plate 309 at the same time.

[0035] Please refer to Figure 3 , Figure 4 A rectangular cavity is formed on the lower surface of the push plate 301, and an extension plate 3013 is slidably provided on the inner wall of the rectangular cavity. The inner bottom wall of the blanking funnel 201 is an inclined symmetrical structure. The bottom ends of the two extension plates 3013 are provided with inclined surfaces that are compatible with the inner bottom wall of the blanking funnel 201, and the bottom ends of the extension plates 3013 are slidably connected to the inner bottom wall of the blanking funnel 201.

[0036] Specifically, by providing the extension plate 3013 , the extension plate 3013 can be driven to move synchronously during the movement of the push plate 301 , so that the extension plate 3013 can clean the dirt on the bottom wall of the blanking funnel 201 .

[0037] Please refer to Figure 6 , Figure 7 A number of clamping springs 3014 are equidistantly fixed on the upper surface of the extension plate 3013, and the ends of the clamping springs 3014 away from the extension plate 3013 are fixedly connected to the inner top wall of the rectangular cavity, and an elastic material blocking cloth 3015 is fixedly provided on the top outer surface of the push plate 301, and the end of the elastic material blocking cloth 3015 away from the push plate 301 is fixedly connected to the inner wall of the steel mesh cavity 100.

[0038] Specifically, by providing the pressing spring 3014 , the bottom of the extension plate 3013 can always be in contact with the inner bottom wall of the blanking funnel 201 .

[0039] Please refer to Figure 7 A semicircular material retaining column 3016 is fixedly provided on the upper surface of the connection box 302, and the semicircular material retaining column 3016 is made of solid steel.

[0040] Specifically, by providing a semicircular material retaining column 3016, it is possible to prevent mud from accumulating on the upper surface of the connection box 302.

[0041] Please refer to Figure 4 , Figure 7A connecting shaft 3017 is rotatably provided on the back of the rectangular box 306, and one end of the connecting shaft 3017 extends to the interior of the rectangular box 306 and is fixedly provided with a first driven bevel gear 3018, a first driving bevel gear 3019 meshing with the first driven bevel gear 3018 is fixedly provided on the surface of the rotating shaft 307, the other end of the connecting shaft 3017 extends to the interior of the connecting box 302 and is fixedly provided with a second driving bevel gear 3020, and a second driven bevel gear 3021 meshing with the second driving bevel gear 3020 is fixedly provided on the surface of the rotating rod 303.

[0042] Specifically, by providing the first active bevel gear 3019, the first driven bevel gear 3018, the connecting shaft 3017, the second active bevel gear 3020 and the second driven bevel gear 3021, the first active bevel gear 3019 can be driven to rotate through the rotation of the rotating shaft 307, the rotation of the first active bevel gear 3019 drives the first driven bevel gear 3018 and the connecting shaft 3017 to rotate, the rotation of the connecting shaft 3017 drives the second active bevel gear 3020 to rotate, the rotation of the second active bevel gear 3020 drives the second driven bevel gear 3021 and the rotating rod 303 to rotate, the rotation of the rotating rod 303 drives the spiral conveying blade 304 to rotate inside the blanking pipe 202, so that the soil in the blanking funnel 201 can automatically enter the blanking pipe 202, and the soil in the blanking pipe 202 can be automatically discharged.

[0043] In this embodiment, by setting up a discharge component 300, when it is necessary to discharge the soil temporarily stored in the blanking funnel 201 and the blanking pipe 202, the blanking valve 203 can be opened and the driving motor 305 can be started, so that the two push plates 301 push the soil in the blanking funnel 201 to the middle, avoiding the soil from clogging the inside of the blanking funnel 201, thereby improving the discharge efficiency. At the same time, it can drive the spiral conveying blade 304 to rotate inside the blanking pipe 202, so that the soil in the blanking funnel 201 can automatically enter the blanking pipe 202, and the soil in the blanking pipe 202 can be automatically discharged, thereby further improving the discharge efficiency, and effectively solving the problem that the soil is easy to clog the blanking funnel 201 and the blanking pipe 202 during discharge.

[0044] Working principle: (In the initial state, the outer surfaces of the two push plates 301 are respectively in contact with the inner walls of the two sides of the blanking funnel 201, and the extension plate 3013 is completely received in the rectangular cavity), the soil falling from the slope of the deep foundation pit can pass through the lower mesh surface 101 into the interior of the steel mesh cavity 100, and under the action of the upper mesh surface 102, it falls into the blanking funnel 201 and the blanking pipe 202 for collection, thereby ensuring that most of the scattered soil is not scattered into the foundation pit at will, and to a certain extent reduces the pressure on the lower mesh surface 101, that is, it increases the service life of the lower mesh surface 101 and avoids the trouble caused by replacing the steel mesh. When it is necessary to discharge the soil temporarily stored in the blanking hopper 201 and the blanking pipe 202, the blanking valve 203 can be opened to allow the soil to automatically fall downward under the action of its own gravity, and the driving motor 305 is started at the same time. The rotation of the driving motor 305 drives the rotating shaft 307 to rotate, and the rotation of the rotating shaft 307 drives the two reciprocating screws 308 to rotate at the same time. The rotation of the two reciprocating screws 308 drives the two moving plates 309 to reciprocate at the same time, so that the two moving plates 309 reciprocate and move toward the middle and to both sides at the same time. The movement of the moving plate 309 drives the two push plates 309 through the L-shaped connecting rod 3011 01 The inner bottom wall of the blanking funnel 201 moves back and forth toward the middle and toward both sides at the same time, and during the movement of the push plate 301, the extension plate 3013 can always fit and slide with the inner bottom wall of the blanking funnel 201 under the action of the pressing spring 3014, so that the two push plates 301 can push the soil in the blanking funnel 201 toward the middle, avoiding the soil from clogging the inside of the blanking funnel 201, thereby improving the discharge efficiency. At the same time, during the rotation of the rotating shaft 307, it can drive the first active bevel gear 3019 to rotate, and the rotation of the first active bevel gear 3019 drives the first driven bevel gear 3019 to rotate. 018 rotates with the connecting shaft 3017, the rotation of the connecting shaft 3017 drives the second active bevel gear 3020 to rotate, the rotation of the second active bevel gear 3020 drives the second driven bevel gear 3021 and the rotating rod 303 to rotate, the rotation of the rotating rod 303 drives the spiral conveying blade 304 to rotate inside the blanking pipe 202, so that the soil in the blanking funnel 201 can automatically enter the blanking pipe 202, and the soil in the blanking pipe 202 can be automatically discharged, thereby further improving the discharge efficiency, and effectively solving the problem that the blanking funnel 201 and the blanking pipe 202 are easily blocked by soil during discharge.

[0045] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A deep foundation pit protection structure, characterized in that: include: Steel mesh cavity (100); A collecting assembly (200) for guiding and collecting soil dropped from the middle of the steel mesh cavity (100), the collecting assembly (200) comprising a material dropping funnel (201) fixedly arranged at the bottom end of the steel mesh cavity (100), a material dropping pipe (202) fixedly arranged at the bottom end of the material dropping funnel (201), and a material dropping valve (203) arranged on the surface of the material dropping pipe (202); A discharge assembly (300) is used to automatically discharge soil inside a discharge hopper (201) and a discharge pipe (202) after a discharge valve (203) is opened. The discharge assembly (300) comprises two symmetrical push plates (301) slidably arranged on the inner wall of the discharge hopper (201), and a connection box (302) fixedly arranged on the inner wall of a steel mesh cavity (100). A rotating rod (303) extending to the lower surface of the connecting box (302) and extending to the inside of the discharge pipe (202) is rotatably arranged on the inner top wall of the connection box (302), and a spiral conveying blade (304) is fixedly arranged on the surface of the rotating rod (303). The discharge assembly (300) further comprises a driving motor (305) for driving the two push plates (301) to move toward the middle at the same time and driving the rotating rod (303) to rotate.

2. A deep foundation pit protection structure according to claim 1, characterized in that: The steel mesh cavity (100) comprises a lower mesh surface (101) and an upper mesh surface (102), wherein the lower mesh surface (101) is arranged closely to the slope surface of the foundation pit, and the upper mesh surface (102) is fixed to the upper surface of the lower mesh surface (101) via mounting columns, and the aperture of the holes on the upper mesh surface (102) is smaller than the aperture of the holes on the lower mesh surface (101).

3. A deep foundation pit protection structure according to claim 2, characterized in that: A rectangular box (306) is fixedly arranged on the front side of the steel mesh cavity (100), and the drive motor (305) is fixedly arranged on the outer surface of the rectangular box (306). The output end of the drive motor (305) extends into the interior of the rectangular box (306) and is fixedly arranged with a rotating shaft (307). The outer surface of the rotating shaft (307) is provided with two symmetrical reciprocating screws (308). Mounting holes are provided at both ends of the reciprocating screws (308), and the inner walls of the mounting holes are fixedly connected to the outer surface of the rotating shaft (307).

4. A deep foundation pit protection structure according to claim 3, characterized in that: Two symmetrical moving plates (309) are slidably disposed on the inner wall of the rectangular box (306), and threaded holes threadedly connected to the outer surface of the reciprocating screw (308) are provided on the sides of the two moving plates (309).

5. A deep foundation pit protection structure according to claim 4, characterized in that: Two symmetrical limiting rods (3010) are fixedly provided on the inner walls of both sides of the rectangular box (306), and limiting blocks are fixedly provided on the ends of the four limiting rods (3010), and limiting sliding holes for the two limiting rods (3010) to slide are opened on the sides of the two movable plates (309).

6. A deep foundation pit protection structure according to claim 4, characterized in that: An L-shaped connecting rod (3011) is fixedly provided on the lower surfaces of the two movable plates (309), and one end of the two L-shaped connecting rods (3011) away from the movable plates (309) is fixedly connected to the upper surfaces of the two push plates (301) respectively, and the back side of the rectangular box (306) and the front side of the steel mesh cavity (100) are both provided with a strip opening (3012) for the L-shaped connecting rod (3011) to slide.

7. The deep foundation pit protection structure according to claim 1, characterized in that: A rectangular cavity is formed on the lower surface of the push plate (301), and an extension plate (3013) is slidably provided on the inner wall of the rectangular cavity. The inner bottom wall of the blanking funnel (201) is an inclined symmetrical structure. The bottom ends of the two extension plates (3013) are formed with inclined surfaces that match the inner bottom wall of the blanking funnel (201), and the bottom ends of the extension plates (3013) are slidably connected to the inner bottom wall of the blanking funnel (201).

8. A deep foundation pit protection structure according to claim 7, characterized in that: A plurality of retaining springs (3014) are fixedly arranged at equal intervals on the upper surface of the extension plate (3013), and one end of each of the retaining springs (3014) away from the extension plate (3013) is fixedly connected to the inner top wall of the rectangular cavity. An elastic material blocking cloth (3015) is fixedly arranged on the outer surface of the top end of the push plate (301), and one end of the elastic material blocking cloth (3015) away from the push plate (301) is fixedly connected to the inner side wall of the steel mesh cavity (100).

9. The deep foundation pit protection structure according to claim 1, characterized in that: A semicircular material blocking column (3016) is fixedly provided on the upper surface of the connection box (302), and the semicircular material blocking column (3016) is made of solid steel.

10. A deep foundation pit protection structure according to claim 3, characterized in that: A connecting shaft (3017) is rotatably provided on the back of the rectangular box (306), and one end of the connecting shaft (3017) extends into the interior of the rectangular box (306) and is fixedly provided with a first driven bevel gear (3018), a first driving bevel gear (3019) that meshes with the first driven bevel gear (3018) is fixedly provided on the surface of the rotating shaft (307), the other end of the connecting shaft (3017) extends into the interior of the connecting box (302) and is fixedly provided with a second driving bevel gear (3020), and a second driven bevel gear (3021) that meshes with the second driving bevel gear (3020) is fixedly provided on the surface of the rotating rod (303).

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