A municipal road foundation pit safety protection device

Abstract

The application discloses a kind of municipal road foundation pit safety protection device, it is related to municipal road protection technical field, it solves the problem that the adaptability of existing technology to multidirectional external force impact is poor, and the problem of insufficient buffering support protection capability;Including support frame;Protective plate is set on the support frame body, the protective plate includes middle plate and the side plate that is respectively rotationally connected to the both sides of the middle plate;Further include: elastic support buffer mechanism, installed on the support frame body, for supporting the protective plate and buffering impact force is installed;The elastic support buffer mechanism includes the mounting rack plate fixed to the side of the support frame body;And multiple elastic buffer devices arranged in mounting rack plate in vertical direction;The application is by setting the protective plate and elastic buffer device of split type, solve the problem that the existing foundation pit protection device is single in impact resistance direction, and the problem of insufficient buffering capacity, significantly improve the protection safety.

Description

Technical Field

[0001] This invention relates to the field of municipal road protection technology, and in particular to a safety protection device for foundation pits in municipal roads. Background Technology

[0002] During the construction of municipal roads, protective devices are usually required around the foundation pit to prevent pedestrians, non-motorized vehicles or construction equipment from accidentally falling into the pit and to ensure the safety of the construction area and the surrounding environment.

[0003] Currently, most commonly used foundation pit safety protection devices are fixed fences or simple barriers, which are simple in structure and can only provide basic physical isolation. Actual construction environments are complex and variable; the protective barriers may be subjected to impacts from different directions, such as: debris impacts from side winds, scraping from construction machinery, or even accidental collisions from vehicles. Existing foundation pit safety protection devices typically use rigid connections or unidirectional elastic elements (such as springs perpendicular to the protective barrier). When the impact force comes from a non-perpendicular direction (such as oblique or lateral), it often leads to damage to the connection points, partial breakage of the protective barrier, or failure of the buffer mechanism to trigger effectively, thus losing its protective function.

[0004] In summary, existing technologies suffer from poor adaptability to multi-directional external force impacts and insufficient buffering and support capabilities. Summary of the Invention

[0005] The purpose of this invention is to address the problems of poor adaptability to multi-directional external force impacts and insufficient buffer support and protection capacity of traditional foundation pit safety protection devices, and to propose a foundation pit safety protection device for municipal roads.

[0006] To achieve the above objectives, the present invention employs the following technology: a safety protection device for foundation pits in municipal roads, comprising a support frame; A protective plate is disposed on the support frame, the protective plate including a middle plate and side plates respectively rotatably connected to both sides of the middle plate; It also includes: an elastic support and buffer mechanism, installed on the support frame, used to support the installation of the protective plate and buffer the impact force; The elastic support and buffer mechanism includes a mounting plate fixed to the side of the support frame; and a plurality of elastic buffer devices arranged vertically within the mounting plate, each of the elastic buffer devices being connected to the middle plate and the two side plates respectively; When the protective plate is impacted, the middle plate or the side plate causes the corresponding elastic buffer device to deform in order to absorb the impact energy and adapt to the impact force from different directions.

[0007] As a type of safety protection device for foundation pits in municipal roads, as described above: Each of the aforementioned elastic buffer devices includes an arc-shaped curved plate, a pressure plate, and at least one hydraulic strut; The cylinder end of the hydraulic strut is located on the inner side of the pressure plate. The outer side of each arc-shaped plate is connected to the piston rod end of the hydraulic strut. An integral first bearing plate is provided in the middle of the inner side of each arc-shaped plate. An integral second bearing plate is provided on both sides of the first bearing plate. The side of the first bearing plate is movably connected to the middle plate. The two second bearing plates are movably connected to the two side plates respectively. When the arc-shaped plate undergoes elastic deformation, the first bearing plate and the second bearing plate can be displaced or rotated relative to the protective plate to adapt to impact forces from different directions.

[0008] As a type of safety protection device for foundation pits in municipal roads, as described above: The elastic support and buffer mechanism further includes a mounting base fixedly disposed inside each of the pressure plates and an annular limiting platform rotatably disposed at the end of the mounting base. The cylinder of the hydraulic strut is fixed inside the annular limiting platform, and there is a preset limiting gap between the end face of the annular limiting platform and the back of the curved plate. When the back of the curved plate is bent to contact the end face of the annular limiting platform, the annular limiting platform forms a rigid auxiliary support for the back of the curved plate.

[0009] As a type of safety protection device for foundation pits in municipal roads, as described above: Metal gaskets are fixedly provided on the end faces of the annular limiting platform. The end faces of the metal gaskets are designed with a spherical or flared conical surface.

[0010] As a type of safety protection device for foundation pits in municipal roads, as described above: A set of guide parts is fixedly provided on the back of the curved plate, and each guide part has a mounting port on its side. The piston rod end of the hydraulic strut is movably disposed in the mounting port. The guide part is used to cooperate with the port of the metal gasket to abut against it, so as to limit the offset of the curved plate.

[0011] As a type of safety protection device for foundation pits in municipal roads, as described above: The elastic support and buffer mechanism further includes a linkage component, which includes a linkage telescopic rod that is inclinedly and movably disposed between each of the first support plate and the second support plate. A pressure-bearing telescopic rod is movably disposed on the linkage telescopic rod, and the piston rod end of the pressure-bearing telescopic rod is movably disposed on the intermediate plate and located on both sides of the first support plate.

[0012] As a type of safety protection device for foundation pits in municipal roads, as described above: The elastic support and buffer mechanism further includes an adjustment component, which includes an adjustment base fixed to the inner wall of the mounting plate and a ball screw rotatably disposed within the adjustment base. The port of the adjustment base is provided with multiple independent adjustment zones. The ball screw includes multiple sections of coaxially arranged and independently rotatably disposed within each adjustment zone. Each section of the ball screw is threaded with a slider. Limit grooves are provided on both sides of the inner wall of each adjustment zone. The sliders slide within the limit grooves on both sides. The ball screws are used to adjust each elastic buffer device.

[0013] As a type of safety protection device for foundation pits in municipal roads, as described above: The number of the elastic buffer device and the drive device is at least three, and the number of the lead screw is at least three sections.

[0014] As a type of safety protection device for foundation pits in municipal roads, as described above: The device also includes a connection and separation assembly for connecting two adjacent protective devices; The connection and separation assembly includes a first connecting bend plate and a second connecting bend plate. One end of the first connecting bend plate is rotatably disposed on both sides of the support frame of a protective device, and one end of the second connecting bend plate is rotatably disposed on both sides of the support frame of an adjacent protective device. The other end of the first connecting bend plate is bent to form a U-shaped guide groove, and the other end of the second connecting bend plate is fixedly connected to a U-shaped guide rod. The U-shaped guide rod can be detachably inserted into the U-shaped guide groove.

[0015] In summary, due to the adoption of the above-mentioned technology in the safety protection device for foundation pits in municipal roads, the beneficial effects of this invention are: (1) This invention uses a split protective plate with a rotating connection between the middle plate and the side plate, and multiple elastic buffer devices arranged independently in the vertical direction. When the protective plate is impacted, the arc-shaped plate first undergoes elastic deformation to absorb the main impact energy. At the same time, the hydraulic strut is compressed and provides damping buffer. On the one hand, it realizes the graded absorption and rapid dissipation of impact energy, effectively reducing the impact load transmitted to the support frame, thereby avoiding the damage of rigid impact to the frame and the side wall of the pit. On the other hand, after installation, the entire protective plate can be reinforced and supported from the side, resulting in higher stability. At the same time, the linkage telescopic rod and the pressure-bearing telescopic rod transmit part of the impact force to the middle plate and the other side plate, so that the impact force can be dispersed in a coordinated manner, avoiding excessive local stress, and significantly improving the overall adaptability and impact resistance of the device to oblique, lateral and combined impacts.

[0016] (2) The present invention sets an installation seat on the inner side of the pressure plate and sets an annular limiting platform in the installation seat to fix the cylinder of the hydraulic strut in the annular limiting platform. At the same time, a limiting gap is reserved between the end face of the annular limiting platform and the back of the curved plate. This allows the elastic buffer device to work independently under small impacts, while when the curved plate is excessively deformed due to strong impacts, its back side contacts the end face of the annular limiting platform and the annular limiting platform provides rigid auxiliary support. This design effectively prevents the curved plate from breaking and is significantly extended to extend the service life of the device.

[0017] (3) The solution of the present invention is to set an adjustment base on the inner wall of the mounting plate and set multiple independent adjustment zones in its port. By using multiple coaxial and independently rotating sub-screws in conjunction with sliders and guide rods, and with the independent drive devices on the outside of each adjustment zone, the initial position and pre-tightening force of each elastic buffer device can be independently adjusted. The buffer stiffness can be set according to the protection requirements at different heights of the pit (such as the near side and the middle part needing to resist vehicle impact), which improves the flexibility and economy of the device in different application scenarios.

[0018] (4) The solution of the present invention, by setting a connection and separation assembly consisting of a first connecting bent plate, a second connecting bent plate, a spiral guide groove and a spiral guide rod, realizes quick sliding insertion and separable connection between two adjacent protective devices, and can be disassembled and assembled without tools, which facilitates rapid deployment in the construction area and replacement of damaged parts. At the same time, the elasticity of the connecting bent plate itself can provide additional cushioning in the event of an impact. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure according to the present invention is shown; Figure 2 A schematic diagram of the elastic support buffer mechanism according to the present invention is shown; Figure 3 A schematic diagram of the structure of the adjustment component installed on the support frame according to the present invention is shown; Figure 4 A schematic diagram of the back structure of a single arc-shaped curved plate according to the present invention is shown; Figure 5 A schematic diagram of the structure of the hydraulic strut installed on the annular limiting platform according to the present invention is shown; Figure 6 A schematic diagram of the elastic support buffer mechanism and protective plate structure according to the present invention is shown; Figure 7 A schematic diagram of the support frame, mounting plate, and connecting / separating assembly according to the present invention is shown. Figure 8 A schematic diagram of the exploded structure of the connection and separation components according to the present invention is shown.

[0020] Legend: 1. Protective plate; 11. Intermediate plate; 12. Side plate; 2. Support frame; 3. Elastic support and buffer mechanism; 31. Elastic buffer device; 311. Arc-shaped bent plate; 312. Guide part; 313. Pressure plate; 314. Hydraulic strut; 315. First support plate; 316. Second support plate; 317. Mounting port; 32. Mounting frame plate; 33. Adjustment assembly; 331. Ball screw; 332. Adjustment base; 333. Limiting groove; 334. Sub-screw; 335. Slider; 34. Mounting seat; 35. Annular limiting platform; 351. Metal gasket; 36. Linkage component; 361. Linkage telescopic rod; 362. Pressure-bearing telescopic rod; 301. Adjustment area; 4. Connection and separation assembly; 41. First connecting bent plate; 42. Second connecting bent plate; 401. U-shaped guide groove; 402. U-shaped guide rod. Detailed Implementation

[0021] The following will describe, with reference to the accompanying drawings of the embodiments of the present invention, a safety protection device for foundation pits in municipal roads according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-8 As shown, a safety protection device for foundation pits in municipal roads includes a support frame 2, a protective plate 1, and an elastic support buffer mechanism 3. Specifically, the protective plate 1 is set on the support frame 2. The protective plate 1 includes a middle plate 11 and two side plates 12. A notch is opened on the left and right sides of the middle plate 11 respectively. The two side plates 12 are respectively rotatably set in the corresponding notches through a rotating shaft, so that each side plate 12 can rotate freely relative to the middle plate 11 within a certain angle range. Specifically, the elastic support and buffer mechanism 3 is installed on the support frame 2 to support the installation of the protective plate 1 and buffer the impact force from the protective plate 1. The elastic support and buffer mechanism 3 includes a mounting plate 32 fixed to the side of the support frame 2. The top surface of the mounting plate 32 is fixed to the top side of the support frame 2 by bolts, and the bottom surface of the mounting plate 32 is connected to both sides of the support frame 2 by bolts to form an integral frame; and multiple elastic buffer devices 31 arranged vertically in the mounting plate 32. It should be noted that the total number of elastic buffer devices 31 is at least three, and each elastic buffer device 31 is connected to the middle plate 11 and the two side plates 12 respectively. More specifically, each elastic buffer device 31 includes an arc-shaped curved plate 311, a slider 335, a pressure plate 313, and at least one hydraulic strut 314 (three in this embodiment). The back of the pressure plate 313 is inserted and fixed to the side of the slider 335. The end of the hydraulic strut 314 is movably disposed on the inner side of the pressure plate 313. The outer side of each arc-shaped curved plate 311 is movably connected to the piston rod end of the hydraulic strut 314, so that the hydraulic strut 314 can swing within a certain angle range. An integral first support plate 315 is provided in the middle of the inner side of each arc-shaped curved plate 311. An integral second support plate 316 is provided on both sides of the first support plate 315. The side of the first support plate 315 is movably connected to the middle plate 11 (e.g., through a pin). The two second support plates 316 are movably connected to the two side plates 12 respectively. When the protective plate 1 is impacted from the front or at an angle, the middle plate 11 and / or the side plate 12 are subjected to force, which pushes the corresponding first bearing plate 315 and / or second bearing plate 316 respectively. The pushed bearing plates then compress the arc-shaped curved plate 311, causing it to undergo elastic deformation under pressure. At the same time, the hydraulic strut 314 is compressed and provides damping force, thereby absorbing and dissipating the impact energy. Since the side plate 12 is rotatably connected to the middle plate 11, and each arc-shaped curved plate 311 is connected to each plate body through an independent first bearing plate 315 and second bearing plate 316, when the impact force comes from the side, only the corresponding side plate 12 will significantly compress the arc-shaped curved plate 311 it is connected to, while the middle plate 11 is less affected, thus achieving selective buffering.

[0023] Combination Figures 1 to 8 To address the issue of traditional elastic buffer devices 31 being prone to plastic deformation or fracture under impact, the design further includes: a mounting base 34 and an annular limiting platform 35, used to prevent overload protection and limit deformation of the curved plate 311. Specifically, it also includes: The mounting base 34 is fixedly installed on the inner side of each pressure plate 313, the end of the annular limiting platform 35 is rotatably installed in the mounting base 34, so that the annular limiting platform 35 can rotate around its axis, the cylinder of the hydraulic strut 314 is fixed in the annular limiting platform 35, and there is a preset limiting gap between the end face of the annular limiting platform 35 and the back of the arc-shaped bent plate 311. When a minor impact occurs, the curved plate 311 undergoes elastic deformation, and its back side does not contact the end face of the annular limiting platform 35. When a stronger impact occurs, the curved plate 311 is further flattened, and its back side bends to contact the end face of the annular limiting platform 35. At this time, the annular limiting platform 35 forms a rigid auxiliary support for the back side of the curved plate 311, preventing the curved plate 311 from undergoing plastic fracture or permanent deformation.

[0024] In this embodiment, as a preferred implementation, the elastic support buffer mechanism 3 further includes a linkage component 36. The linkage component 36 includes a linkage telescopic rod 361 that is inclinedly and movably disposed between each first support plate 315 and second support plate 316. The end of the linkage telescopic rod 361 is movably disposed on both sides of the first support plate 315 (e.g., via a pin), and the piston rod end is movably disposed on the arc-shaped bent plate 311 (e.g., movably connected via a pin). A pressure-bearing telescopic rod 362 is movably disposed on the linkage telescopic rod 361. This end is the cylinder end of the pressure-bearing telescopic rod 362. The piston rod end of the pressure-bearing telescopic rod 362 is movably disposed on the intermediate plate 11 and located on both sides of the first support plate 315 (e.g., movably connected via a pin). When subjected to a frontal impact, under the action of the linkage telescopic rod 361 and the pressure-bearing telescopic rod 362, part of the impact force is transmitted to the side plates 12 on both sides, so that the impact force can be dispersed in a coordinated manner, avoiding excessive local force, and significantly improving the overall adaptability and impact resistance of the device to oblique, lateral and combined impacts.

[0025] In this embodiment, as a preferred implementation, a metal gasket 351 is fixedly provided on the end face of the annular limiting platform 35. The metal gasket 351 is used to reduce the wear between the arc-shaped curved plate 311 and the pressure plate 313.

[0026] In this embodiment, as a preferred implementation, a set of guide portions 312 are fixedly provided on the back of the curved plate 311. Each guide portion 312 has a mounting port 317 on its side. The piston rod end of the hydraulic strut 314 is movably disposed in the mounting port 317. The end face of the metal gasket 351 adopts a flared conical surface design. The guide portion 312 is used to cooperate and abut with the port of the metal gasket 351 to provide a smoother transition support when in contact. When the curved plate 311 undergoes torsional deformation, the contact between the guide portion 312 and the metal gasket 351 can limit the excessive displacement of the curved plate 311 and maintain its buffer directionality.

[0027] Combination Figures 1 to 8 In order to solve the problem that traditional protective devices cannot independently adjust the height of the buffer device according to actual needs, the elastic support buffer mechanism 3 also includes an adjustment component 33; Specifically, the adjustment assembly 33 includes an adjustment base 332 fixed to the inner wall of the mounting plate 32 and a ball screw 331 rotatably disposed in the adjustment base 332; More specifically, the port of the adjusting base 332 is provided with multiple independent adjusting areas 301. The ball screw 331 includes multiple sections of sub-screws 334 that are coaxially arranged and independently rotatable in each adjusting area 301. Each section of sub-screw 334 is threaded with a slider 335. Limiting grooves 333 are provided on both sides of the inner wall of each adjusting area 301. The sliders 335 slide in the limiting grooves 333 on both sides to prevent rotation. It should be noted that the adjustment base 332 is equipped with multiple drive devices in each adjustment zone 301. The drive devices consist of a manual adjustment handle and gears. Each drive device is used to drive the corresponding lead screw 334 to rotate. By independently driving the lead screw 334 in different adjustment zones 301, the corresponding slider 335 can be moved in the vertical direction. This realizes the independent adjustment of the initial position and preload of each elastic buffer device 31. The buffer stiffness can be set according to the protection requirements at different heights of the pit (such as the near-ground side and the middle part needing to resist vehicle impact), thereby improving the flexibility and economy of the device in different application scenarios. It should be further explained that the adjustment zone 301 is provided with at least three sections, and the lead screw 334 is also provided with at least three sections, in order to adapt to the protection requirements of different heights.

[0028] Combination Figures 1 to 8 In order to solve the problems of the inability to quickly and stably connect multiple protective devices, low disassembly and assembly efficiency, and easy relative displacement or detachment when subjected to impact, the specific design also includes: a connection and separation component 4 for connecting two adjacent protective devices, the connection and separation component 4 including a first connecting bend 41 and a second connecting bend 42. Specifically, one end of the first connecting plate 41 is rotatably mounted on the side of the support frame 2 of a protective device, and one end of the second connecting plate 42 is rotatably mounted on the side of the support frame 2 of an adjacent protective device. The other end of the first connecting plate 41 is bent outward to form a U-shaped guide groove 401, and the other end of the second connecting plate 42 is fixedly connected to a U-shaped guide rod 402. During installation and use, the U-shaped guide rod 402 on the second connecting plate 42 is slidably and separably inserted into the U-shaped guide groove 401 of the first connecting plate 41 to achieve quick connection of adjacent protective devices. After connection, it is not easy to separate and no manual tightening is required. When separation is required, the U-shaped guide rod 402 can be pulled out for separation. The operation and use are convenient.

[0029] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: Combination Figures 1-8 The process flow / principle of the safety protection device for foundation pits in municipal roads provided by this invention are as follows: First, based on the size of the pit and protection requirements, the operator aligns the first connecting plate 41 and the second connecting plate 42 of two adjacent devices, inserts the loop guide rod 402 on the second connecting plate 42 into the loop guide groove 401 of the first connecting plate 41, and pushes it to the bottom, completing the quick connection of the adjacent devices. Subsequently, the drive device drives the lead screw 334 in different adjustment zones 301 to rotate. The lead screw 334 drives the slider 335 and the entire elastic buffer device 31 to move up and down along the limiting slide groove 333. The independent adjustment of the initial position and preload of each elastic buffer device 31 allows for setting the buffer stiffness according to the protection requirements at different heights of the pit (such as the near-ground side and the middle section needing to resist vehicle impact), thereby improving the flexibility and economy of the device in different application scenarios.

[0030] When the protective device is impacted by an external force, the impact force first acts on the protective plate 1. Since the middle plate 11 and the side plate 12 are rotatably connected, they can adaptively deflect according to the direction of the impact force. Depending on the impact position, the device operates in the following two states: Impact state of intermediate plate 11: When an impact force is applied to intermediate plate 11, intermediate plate 11 moves towards support frame 2 after being subjected to force, pushing the first support plate 315 that is movably connected to it. In this way, the first support plate 315 transmits the force to the inner middle area of ​​the arc-shaped curved plate 311. After being subjected to pressure, the arc-shaped curved plate 311 undergoes elastic deformation, converting the impact kinetic energy into elastic potential energy and consuming a portion of it. At the same time, the deformation of the arc-shaped curved plate 311 will push the piston rod of the hydraulic strut 314 connected to its outer side. The hydraulic oil inside the hydraulic strut 314 generates damping force through the damping hole, further absorbing and dissipating kinetic energy, thus achieving two-stage buffering. Meanwhile, since the linkage telescopic rod 361 of the linkage component 36 is inclined and movable between the first bearing plate 315 and the second bearing plate 316, and the pressure-bearing telescopic rod 362 is rotatably mounted on the intermediate plate 11, when the intermediate plate 11 is subjected to force and moves, the linkage telescopic rod 361 and the pressure-bearing telescopic rod 362 transmit part of the impact force to the second bearing plates 316 on both sides by contraction, which can drive the side plates 12 on both sides to produce coordinated displacement, so that the impact force can be dispersed to both sides, thereby avoiding excessive local force on the intermediate plate 11; Impact state of side plate 12: When an impact force is applied to a side plate 12, the side plate 12 rotates around the axis connecting it to the intermediate plate 11 and moves towards the support frame 2, pushing the second support plate 316 movably connected to it. The second support plate 316 then transmits the force to the inner edge region of the curved plate 311, causing the curved plate 311 to undergo asymmetrical elastic deformation, converting the impact kinetic energy into elastic potential energy. Simultaneously, the hydraulic strut 314 on that side is compressed and provides damping buffer. Because the intermediate plate 11 and side plate 12 are rotatably connected, and each elastic buffer device 31 is independently connected to its respective plate, when the impact force comes from the side, only the corresponding side plate 12 will significantly compress the connected curved plate 311, while the intermediate plate 11 is less affected, achieving selective buffering. At the same time, the linkage telescopic rod 361 transmits part of the impact force on this side to the first bearing plate 315 and the middle bearing telescopic rod 362, and then to the middle plate 11 and the side plate 12 on the other side, so that the impact force on one side can be distributed to the entire protective plate 1 in a coordinated manner, avoiding excessive force on one side and causing local damage.

[0031] If the impact force is very large, the deformation of the curved plate 311 will exceed the preset limit gap. The back of the curved plate 311 will directly contact and press against the metal pad 351 on the end face of the annular limiting platform 35. At this time, the annular limiting platform 35 will no longer allow the curved plate 311 to deform further, but will directly transmit the remaining impact force to the support frame 2 through the mounting base 34, the pressure plate 313, and the slider 335 to achieve rigid support, thereby protecting the curved plate 311 from being crushed and damaged.

[0032] After the impact, the curved plate 311 returns to its original shape due to its own elasticity, the hydraulic strut 314 also returns to its original position, and the protective plate 1 automatically returns to its initial position. If it is necessary to remove or replace a certain device, simply pull the loop guide rod 402 out of the loop guide groove 401 to achieve quick separation.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's concept of a safety protection device for foundation pits in municipal roads, should be covered within the scope of protection of the present invention.

Claims

1. A safety protection device for foundation pits in municipal roads, comprising a support frame (2); A protective plate (1) is provided on the support frame (2). The protective plate (1) includes a middle plate (11) and side plates (12) rotatably connected to both sides of the middle plate (11). Its features are, Also includes: An elastic support buffer mechanism (3) is installed on the support frame (2) to support the installation of the protective plate (1) and buffer the impact force; The elastic support and buffer mechanism (3) includes a mounting plate (32) fixed to the side of the support frame (2); and a plurality of elastic buffer devices (31) arranged vertically in the mounting plate (32), each of the elastic buffer devices (31) being connected to the middle plate (11) and the two side plates (12). When the protective plate (1) is impacted, the middle plate (11) or the side plate (12) causes the corresponding elastic buffer device (31) to deform in order to absorb the impact energy and adapt to the impact force in different directions.

2. The safety protection device for foundation pits in municipal roads according to claim 1, characterized in that, Each of the elastic buffer devices (31) includes an arc-shaped curved plate (311), a pressure plate (313), and at least one hydraulic strut (314). The cylinder end of the hydraulic strut (314) is located on the inner side of the pressure plate (313). The outer side of each arc-shaped plate (311) is connected to the piston rod end of the hydraulic strut (314). An integral first support plate (315) is provided in the middle of the inner side of each arc-shaped plate (311). An integral second support plate (316) is provided on both sides of the first support plate (315). The side of the first support plate (315) is movably connected to the middle plate (11). The two second support plates (316) are movably connected to the two side plates (12). When the arc-shaped plate (311) undergoes elastic deformation, the first support plate (315) and the second support plate (316) can be displaced or rotated relative to the protective plate (1) to adapt to impact forces in different directions.

3. A safety protection device for foundation pits in municipal roads according to claim 2, characterized in that, The elastic support buffer mechanism (3) further includes a mounting base (34) fixedly disposed inside each of the pressure plates (313) and an annular limiting platform (35) rotatably disposed at the end of the mounting base (34). The cylinder of the hydraulic strut (314) is fixed inside the annular limiting platform (35), and there is a preset limiting gap between the end face of the annular limiting platform (35) and the back of the curved plate (311). When the back of the curved plate (311) is bent to contact the end face of the annular limiting platform (35), the annular limiting platform (35) forms a rigid auxiliary support for the back of the curved plate (311).

4. A safety protection device for foundation pits in municipal roads according to claim 3, characterized in that, The end face of the annular limiting platform (35) is fixedly provided with metal gaskets (351), and the end face of the metal gaskets (351) adopts a flared cone design.

5. A safety protection device for foundation pits in municipal roads according to claim 4, characterized in that, A set of guide portions (312) are fixedly provided on the back of the curved plate (311), and each guide portion (312) has a mounting port (317) on its side. The piston rod end of the hydraulic strut (314) is movably disposed in the mounting port (317). The guide portion (312) is used to cooperate with the port of the metal gasket (351) to abut against it, so as to limit the offset of the curved plate (311).

6. A safety protection device for foundation pits in municipal roads according to claim 2, characterized in that, The elastic support buffer mechanism (3) further includes a linkage component (36), which includes a linkage telescopic rod (361) that is inclined and movably disposed between the first support plate (315) and each of the second support plates (316). A pressure-bearing telescopic rod (362) is movably disposed on the linkage telescopic rod (361), and the piston rod end of the pressure-bearing telescopic rod (362) is movably disposed on the intermediate plate (11) and located on both sides of the first support plate (315).

7. A safety protection device for foundation pits in municipal roads according to claim 2, characterized in that, The elastic support buffer mechanism (3) further includes an adjustment component (33), which includes an adjustment base (332) fixed to the inner wall of the mounting plate (32) and a ball screw (331) rotatably disposed in the adjustment base (332). The port of the adjustment base (332) is provided with multiple independent adjustment zones (301). The ball screw (331) includes multiple sections of coaxially arranged and independently rotatably disposed in each adjustment zone (301). Each section of the sub-screw (334) is threaded with a slider (335). Limiting grooves (333) are provided on both sides of the inner wall of each adjustment zone (301). The slider (335) is slidably disposed in the limiting grooves (333) on both sides. The sub-screw (334) is used to adjust each elastic buffer device (31).

8. A safety protection device for foundation pits in municipal roads according to claim 7, characterized in that, The number of the elastic buffer device (31) and the drive device is at least three, and the number of the lead screw (334) is at least three sections.

9. A safety protection device for foundation pits in municipal roads according to claim 1, characterized in that, The device also includes a connection separation component (4) for connecting two adjacent protective devices; The connection and separation assembly (4) includes a first connecting bend plate (41) and a second connecting bend plate (42). One end of the first connecting bend plate (41) is rotatably disposed on both sides of the support frame (2) of a protective device. One end of the second connecting bend plate (42) is rotatably disposed on both sides of the support frame (2) of an adjacent protective device. The other end of the first connecting bend plate (41) is bent to form a U-shaped guide groove (401). The other end of the second connecting bend plate (42) is fixedly connected to a U-shaped guide rod (402). The U-shaped guide rod (402) can be detachably inserted into the U-shaped guide groove (401).

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