Safety protection device for bridge pile foundation construction close to subway tunnel

Abstract

The invention discloses a safety protection device for construction of a bridge pile foundation close to a subway tunnel, and relates to the technical field of construction of subway tunnel protection structures and protection systems, before a reinforcing mesh and cement guniting support are adopted for foundation pit slope protection, the protection device can be fixed to a designated position through a fixing mechanism, and the safety protection device is convenient to use. The foundation pit is supported by the soil retaining plate, the inclined supporting mechanism is connected with the soil retaining plate, the supporting angle is automatically adjusted, soil pressure and other external force borne by the side wall of the foundation pit can be more evenly transmitted to the soil retaining plate, and the elastic buffering mechanism is installed between the soil retaining plate and the installation plate. The influence of vibration generated during metro operation on a foundation pit is reduced, the rotary drilling rig is guided to excavate holes of a bridge pile foundation through the guide mechanism, dust is removed during drilling through the dust removal mechanism, and dust is prevented from gradually permeating into the space where a metro tunnel is located from various holes and cracks existing in a stratum.

Description

Technical Field

[0001] The invention relates to the technical field of subway tunnel protection structure and protection system construction, in particular to a safety protection device for bridge pile foundation construction adjacent to a subway tunnel. Background Art

[0002] Due to the growing demand for urban public transportation systems, subway projects and road and bridge projects, as the most important ways to utilize urban underground and ground spaces, can be used to alleviate the problem of urban traffic congestion. However, with the increasing number of ground road and bridge projects, it is inevitable that bridges will cross existing subway tunnels, which will have a great impact on the safe use and stable operation of the subway. Therefore, it is necessary to reduce the impact of ground road and bridge projects on the subway during construction.

[0003] Before the construction of bridge pile foundation, it is necessary to construct ground connecting beams. The ground connecting beams are the pedestals, and a foundation pit needs to be dug within the reserved construction range of the TRD method wall. After the foundation pit is dug, the slope protection of the foundation pit is supported by steel mesh and cement spraying, and holes for the bridge pile foundation are drilled in the foundation pit, and then poured in the drilled holes to form the bridge pile foundation.

[0004] There are various pores and cracks in the strata. The dust generated during the drilling construction process can gradually penetrate into the space where the subway tunnel is located through these pores and cracks. During the foundation pit construction, it may be affected by dynamic impact forces such as vibrations from surrounding vehicles. Traditional protective device supports achieve the support effect by driving the supporting components into the ground and fixing them. During the process of driving them into the ground, a strong squeezing pressure will be generated on the surrounding soil, causing the soil to shift and deform, which may affect the subway tunnel. Summary of the invention

[0005] The purpose of the present invention is to provide a safety protection device for bridge pile foundation construction near a subway tunnel to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety protection device for bridge pile foundation construction near a subway tunnel, the protection device comprising a mounting plate, a fixing mechanism, a buffer mechanism, a diagonal bracing mechanism, a retaining plate, a guide mechanism, a dust removal mechanism and a universal wheel, the mounting plate is fixedly connected to the fixing mechanism, the buffer mechanism is fixedly connected to the mounting plate, two diagonal bracing mechanisms are provided, the two diagonal bracing mechanisms are fixedly connected to the fixing mechanism, the retaining plate and the two diagonal bracing mechanisms are slidably connected, the retaining plate and the buffer mechanism are abutted, the guide mechanism is fixedly connected to the mounting plate, the dust removal mechanism is fixedly connected to the mounting plate, four universal wheels are provided, and the four universal wheels are rotatably connected to the fixing mechanism.

[0007] By installing the plate and fixing mechanisms on both sides, four universal wheels are installed on the fixing mechanisms on both sides. The universal wheels are in contact with the ground, so that the protective device can be moved to the specified position. The fixing mechanism allows the protective device to be fixed at the specified position. Before the foundation pit slope protection adopts steel mesh and cement spraying support, it is supported by retaining plates. The diagonal support mechanism and the retaining plates are connected to prevent the collapse of the foundation pit from exerting pressure on the subway tunnel below, while reducing or avoiding the displacement of the soil, thereby minimizing the impact of the construction on the subway tunnel. The vibration generated by the subway operation is reduced by installing an elastic buffer mechanism between the retaining plate and the mounting plate to reduce the impact on the foundation pit. The guide mechanism is used to guide the rotary drilling rig to dig holes for the bridge pile foundation. The dust removal mechanism is used to remove dust during drilling to prevent dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum.

[0008] Furthermore, the fixing mechanism includes a fixing seat, a motor, a transmission rod, a fixing piece and an anchoring unit, the fixing seat and the motor are fixedly connected, the motor output end and the transmission rod are fixedly connected, the transmission rod and the fixing piece are threadedly connected, and the anchoring unit and the transmission rod are threadedly connected.

[0009] The motor is fixed by a fixing seat, the output end of the motor is fixedly connected to the transmission rod, the motor drives the transmission rod to rotate, a thread is arranged on the outside of the transmission rod, and the transmission rod is respectively connected to the fixing part and the anchoring unit by threads, so that the fixing part and the anchoring unit move up and down with the rotation of the transmission rod.

[0010] Furthermore, the anchoring unit includes a nut seat, a guide rod, a No. 1 fixed rod, a grab hook, a driving member and a sliding rod. The nut seat and the transmission rod are threadedly connected, the guide rod and the nut seat are fixedly connected, the fixed seat is provided with a guide groove, the guide rod and the guide groove are slidingly connected, the No. 1 fixed rod and the nut seat are fixedly connected, the grab hook and the nut seat are hinged, the driving member and the sliding rod are rotatably connected, the fixed seat is provided with a No. 1 sliding groove, and the sliding rod and the No. 1 sliding groove are slidingly connected.

[0011] The nut seat is threadedly connected with the transmission rod, and a guide rod is fixedly installed on the nut seat. The guide rod slides along the guide groove, so that the nut seat moves up or down with the rotation of the transmission rod. When the nut seat moves downward, the No. 1 fixed rod drives the driving part to move downward, and the sliding rod slides downward at the same time. When the sliding rod moves to the bottom of the No. 1 sliding groove, the nut seat continues to move downward, and the driving part rotates along the axis of the sliding rod, so that the grab hook rotates along the hinge and hooks the ground, increasing the fixing force in the horizontal direction, and effectively preventing the safety protection device from being displaced, shaking or tipping over during use.

[0012] Furthermore, the fixing part includes an outer shell, a spiral blade, a conical base and a No. 1 slider. The outer shell and the spiral blade are fixedly connected, the conical base and the outer shell are fixedly connected, the outer shell is provided with a No. 2 sliding groove, the No. 1 slider and the No. 2 sliding groove are slidingly connected, the No. 1 slider and the nut seat are fixedly connected, and the No. 2 sliding groove is an annular groove.

[0013] The outer shell and the transmission rod are threadedly connected, and the nut seat is connected to a slider No. 1, which slides in the No. 2 sliding groove of the outer shell. The slider No. 1 is clamped in the No. 2 sliding groove, and the outer shell can rise together with the transmission rod, the outer shell and the nut seat. The No. 2 sliding groove is an annular groove, which enables the outer shell to rotate. The spiral blades rotate into the ground with the rotation of the outer shell, and will form a tight bite with the surrounding soil, thereby increasing the friction and bite force between the outer shell and the soil, so that the fixing can better resist these external forces when subjected to upward pulling force or lateral pressure, thereby improving the supporting stability of the safety protection device on the side walls of the foundation pit, and effectively preventing the deformation and collapse of the side walls of the foundation pit. The conical base design at the bottom can reduce the resistance of the outer shell when entering the soil, making it easier for the fixing to be screwed into the ground.

[0014] Furthermore, the buffer mechanism includes a sleeve, a slide rod and a No. 1 spring, the sleeve is fixedly connected to the mounting plate, the sleeve is slidably connected to the slide rod, and the No. 1 spring is sleeved outside the slide rod.

[0015] The elastic buffer mechanism can effectively absorb and buffer these impact forces. The sliding rod and the retaining plate are in contact. When the retaining plate is subjected to impact force, the sliding rod slides into the sleeve. At the same time, the impact force is reduced by the No. 1 spring, thereby reducing the impact on the protective device and preventing damage or deformation of the supporting structure due to excessive impact force, thereby protecting the side walls of the foundation pit and the subway tunnel below.

[0016] Furthermore, the diagonal bracing mechanism includes a supporting rod, a connecting seat, a No. 2 slider, a No. 2 fixed rod, a No. 2 spring and a clamping block. The supporting rod is hinged to the connecting seat, the No. 2 slider is fixedly connected to the connecting seat, the No. 2 slider is provided with a No. 3 sliding groove, the No. 2 fixed rod is slidably connected to the No. 3 sliding groove, the fixed seat is provided with an installation groove, the No. 2 fixed rod is placed in the installation groove, two No. 2 springs are provided, the two No. 2 springs are sleeved outside the No. 2 fixed rod, the two No. 2 springs are placed on both sides of the No. 2 slider, the clamping block is fixedly connected to the connecting seat, the retaining plate is provided with a No. 4 sliding groove, and the clamping block is slidably connected to the retaining plate.

[0017] The retaining plate is supported obliquely by the support rod. When the pressure on the retaining plate changes, the support rod slides under the action of the No. 2 slider and the block connected to the connecting seat. The No. 2 spring on both sides of the No. 2 slider and the No. 2 slider produce an opposite elastic force to push the support rod back to its original angle or reach a new equilibrium position, thereby realizing automatic adjustment of the support angle of the support rod, so that the earth pressure and other external forces on the side wall of the foundation pit can be more evenly transmitted to the retaining plate, so that it always maintains the best supporting effect, thereby reducing the deformation and displacement of the side wall, ensuring the stability of the foundation pit, and protecting the safety of the subway tunnel below.

[0018] Furthermore, the guiding mechanism comprises a hydraulic cylinder, a connecting block and a sleeve, the hydraulic cylinder is fixedly connected to the mounting plate, the output end of the hydraulic cylinder is fixedly connected to the connecting block, and the sleeve is fixedly connected to the connecting block.

[0019] The connecting block is driven to move by the output end of the hydraulic cylinder, so that the connecting block drives the casing to move to the drilling position. The casing provides precise guidance for the rotary drilling rig to ensure that the drilling rig drills along the predetermined position and direction to avoid deviation during the drilling process. At the same time, the casing can follow up the construction and support the hole wall in time to prevent the hole wall from collapsing.

[0020] Furthermore, the dust removal mechanism includes a water tank, a water pump, a nozzle and a No. 3 fixed rod. The water tank and the water pump are connected by pipeline, the water pump and the nozzle are connected by pipeline, the No. 3 fixed rod and the nozzle are fixedly connected, the No. 3 fixed rod and the connecting block are fixedly connected, the nozzle is annular, and the nozzle is provided with multiple water outlets, and the water outlets face the casing.

[0021] The water in the water tank is pumped out by a water pump, and the water pump is connected to the nozzle pipe to transport the water to the nozzle. The nozzle sprays water at the entrance of the casing, so that the dust is adsorbed and moistened by the water, and quickly gathers into larger particles, preventing the dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum. At the same time, the nozzle is provided with multiple water outlets, and the water outlets are facing the casing, so that a water curtain is formed at the entrance of the casing, thereby reducing the amount of dust generated and preventing dust from spreading outward.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The sleeve of the spiral blade is screwed into the ground, which can provide a certain vertical supporting force. At the same time, the claw hook on the nut seat hooks the ground, which increases the horizontal fixing force and forms a multi-directional fixing structure. It effectively prevents the safety protection device from displacement, shaking or tipping over during use, improves the firmness and stability of the fixation. The multi-directional fixing method makes the safety protection device more stable during use, able to withstand greater loads and external forces, and provides more reliable safety protection for personnel and equipment.

[0024] 2. Spray water to the entrance of the casing through the nozzle, so that the dust is absorbed and moistened by the water, and quickly gathers into larger particles, preventing dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum, forming a water curtain at the entrance of the casing, thereby reducing the amount of dust generated and preventing dust from spreading outward, effectively protecting the health of construction workers.

[0025] 3. By automatically adjusting the support angle of the support rod, the soil pressure and other external forces on the side wall of the foundation pit can be more evenly transmitted to the retaining plate, so that the retaining plate always maintains the best support effect, thereby reducing the deformation and displacement of the side wall, ensuring the stability of the foundation pit, and thus protecting the safety of the subway tunnel below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the distribution structure of the buffer mechanism of the present invention;

[0028] Figure 3 It is a schematic diagram of the fixing mechanism structure of the present invention;

[0029] Figure 4 yes Figure 3 A magnified view of a part A;

[0030] Figure 5 This is a schematic diagram of the structure of the No. 2 sliding slot of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the buffer mechanism of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the diagonal bracing mechanism of the present invention;

[0033] Figure 8 yes Figure 7 A magnified view of a part B;

[0034] Fig. 9 It is a schematic diagram of the structure of the guide mechanism of the present invention;

[0035] Fig.10 yes Fig. 9 A magnified view of local C.

[0036] In the figure: 1. mounting plate; 2. fixing mechanism; 21. fixing seat; 211. guide groove; 212. No. 1 sliding groove; 213. mounting groove; 22. motor; 23. transmission rod; 24. fixing member; 241. housing; 2411. No. 2 sliding groove; 242. spiral blade; 243. conical base; 244. No. 1 sliding block; 25. anchoring unit; 251. nut seat; 252. guide rod; 253. No. 1 fixing rod; 254. grab hook; 255. driving member; 256. sliding rod; 3. buffer Mechanism; 31. sleeve; 32. slide bar; 33. spring No. 1; 4. diagonal brace mechanism; 41. support rod; 42. connecting seat; 43. slide block No. 2; 431. slide slot No. 3; 44. fixed rod No. 2; 45. spring No. 2; 46. block; 5. retaining plate; 51. slide slot No. 4; 6. guide mechanism; 61. hydraulic cylinder; 62. connecting block; 63. sleeve; 7. dust removal mechanism; 71. water tank; 72. water pump; 73. nozzle; 731. water outlet; 74. fixed rod No. 3; 8. universal wheel. DETAILED DESCRIPTION

[0037] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0038] Example: Figure 1 and Figure 2 As shown, the present invention provides a technical solution for a safety protection device for bridge pile foundation construction near a subway tunnel, a safety protection device for bridge pile foundation construction near a subway tunnel, the protection device comprising a mounting plate 1, a fixing mechanism 2, a buffer mechanism 3, a diagonal bracing mechanism 4, a retaining plate 5, a guide mechanism 6, a dust removal mechanism 7 and a universal wheel 8, the mounting plate 1 is fixedly connected to the fixing mechanism 2, the buffer mechanism 3 is fixedly connected to the mounting plate 1, two diagonal bracing mechanisms 4 are provided, the two diagonal bracing mechanisms 4 are fixedly connected to the fixing mechanism 2, the retaining plate 5 is slidably connected to the two diagonal bracing mechanisms 4, the retaining plate 5 is abutted against the buffer mechanism 3, the guide mechanism 6 is fixedly connected to the mounting plate 1, the dust removal mechanism 7 is fixedly connected to the mounting plate 1, four universal wheels 8 are provided, and the four universal wheels 8 are rotatably connected to the fixing mechanism 2.

[0039] By installing the plate 1 and fixing mechanisms 2 on both sides, four universal wheels 8 are installed on the fixing mechanisms 2 on both sides. The universal wheels 8 are in contact with the ground, so that the protective device can be moved to the specified position. The fixing mechanism 2 allows the protective device to be fixed at the specified position. Before the foundation pit slope protection adopts steel mesh and cement spraying support, it is supported by retaining plates 5. The retaining plates 5 are connected by diagonal bracing mechanisms 4 to prevent the collapse of the foundation pit from exerting pressure on the subway tunnel below, while reducing or avoiding the displacement of the soil, thereby minimizing the impact of the construction on the subway tunnel and the vibration generated by the subway operation. By installing an elastic buffer mechanism 3 between the retaining plates 5 and the mounting plate 1, the impact on the foundation pit is reduced. The guide mechanism 6 is used to guide the rotary drilling rig to dig holes for the bridge pile foundation. The dust removal mechanism 7 is used to remove dust during drilling to prevent dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum.

[0040] like Figure 3 As shown, the fixing mechanism 2 includes a fixing seat 21, a motor 22, a transmission rod 23, a fixing piece 24 and an anchoring unit 25. The fixing seat 21 and the motor 22 are fixedly connected, the output end of the motor 22 and the transmission rod 23 are fixedly connected, the transmission rod 23 and the fixing piece 24 are threadedly connected, and the anchoring unit 25 and the transmission rod 23 are threadedly connected.

[0041] The motor 22 is fixed by the fixing seat 21, and the output end of the motor 22 is fixedly connected to the transmission rod 23. The motor 22 drives the transmission rod 23 to rotate. The transmission rod 23 is provided with threads on the outside. The transmission rod 23 is respectively connected to the fixing piece 24 and the anchoring unit 25 through threads, so that the fixing piece 24 and the anchoring unit 25 rotate and move up and down with the transmission rod 23.

[0042] like Figure 3 and Figure 4 As shown, the anchoring unit 25 includes a nut seat 251, a guide rod 252, a No. 1 fixed rod 253, a grab hook 254, a driving member 255 and a sliding rod 256. The nut seat 251 and the transmission rod 23 are threadedly connected, the guide rod 252 and the nut seat 251 are fixedly connected, the fixed seat 21 is provided with a guide groove 211, the guide rod 252 and the guide groove 211 are slidingly connected, the No. 1 fixed rod 253 and the nut seat 251 are fixedly connected, the grab hook 254 and the nut seat 251 are hinged, the driving member 255 and the sliding rod 256 are rotatably connected, the fixed seat 21 is provided with a No. 1 sliding groove 212, and the sliding rod 256 and the No. 1 sliding groove 212 are slidingly connected.

[0043] The nut seat 251 is threadedly connected with the transmission rod 23, and a guide rod 252 is fixedly installed on the nut seat 251. The guide rod 252 slides along the guide groove 211, so that the nut seat 251 moves upward or downward as the transmission rod 23 rotates. When the nut seat 251 moves downward, the No. 1 fixed rod 253 drives the driving member 255 to move downward, and the sliding rod 256 slides downward at the same time. When the sliding rod 256 moves to the bottom of the No. 1 sliding groove 212, the nut seat 251 continues to move downward, and the driving member 255 rotates along the axis of the sliding rod 256, so that the grab hook 254 rotates along the hinge and hooks the ground, thereby increasing the fixing force in the horizontal direction and effectively preventing the safety protection device from being displaced, shaking or tipping over during use.

[0044] like Figure 3-Figure 5 As shown, the fixing member 24 includes a shell 241, a spiral blade 242, a conical base 243 and a No. 1 slider 244, the shell 241 and the spiral blade 242 are fixedly connected, the conical base 243 and the shell 241 are fixedly connected, the shell 241 is provided with a No. 2 sliding groove 2411, the No. 1 slider 244 and the No. 2 sliding groove 2411 are slidingly connected, the No. 1 slider 244 and the nut seat 251 are fixedly connected, and the No. 2 sliding groove 2411 is an annular groove.

[0045] The outer shell 241 and the transmission rod 23 are threadedly connected, and the nut seat 251 is connected to a slider 244. The slider 244 slides in the No. 2 sliding groove 2411 of the outer shell 241. The slider 244 is clamped in the No. 2 sliding groove 2411. The outer shell 241 can rise together with the transmission rod 23, the outer shell 241 and the nut seat 251. The No. 2 sliding groove 2411 is an annular groove, so that the outer shell 241 can rotate. The spiral blade 242 rotates with the outer shell 241 and is screwed into the ground, forming a tight bite with the surrounding soil, increasing the friction and bite force between the outer shell 241 and the soil, so that the fixing part 24 can better resist these external forces when subjected to upward pulling force or lateral pressure, thereby improving the support stability of the safety protection device on the side wall of the foundation pit, and effectively preventing the deformation and collapse of the side wall of the foundation pit. The conical base 243 design at the bottom can reduce the resistance of the outer shell 241 when entering the soil, so that the fixing part 24 is easier to screw into the ground.

[0046] like Figure 2 and Figure 6 As shown, the buffer mechanism 3 includes a sleeve 31 , a slide rod 32 and a spring 33 . The sleeve 31 is fixedly connected to the mounting plate 1 , the sleeve 31 is slidably connected to the slide rod 32 , and the spring 33 is sleeved outside the slide rod 32 .

[0047] The elastic buffer mechanism 3 can effectively absorb and buffer these impact forces. The slide bar 32 abuts against the retaining plate 5. When the retaining plate 5 is subjected to impact force, the slide bar 32 slides into the sleeve 31. At the same time, the impact force is reduced by the No. 1 spring 33, thereby reducing the impact on the protective device and preventing damage or deformation of the supporting structure due to excessive impact force, thereby protecting the side walls of the foundation pit and the subway tunnel below.

[0048] like Figure 7 and Figure 8 As shown, the diagonal bracing mechanism 4 includes a support rod 41, a connecting seat 42, a No. 2 slider 43, a No. 2 fixed rod 44, a No. 2 spring 45 and a clamping block 46. The support rod 41 and the connecting seat 42 are hingedly connected, the No. 2 slider 43 and the connecting seat 42 are fixedly connected, the No. 2 slider 43 is provided with a No. 3 sliding groove 431, the No. 2 fixed rod 44 and the No. 3 sliding groove 431 are slidably connected, the fixed seat 21 is provided with a mounting groove 213, the No. 2 fixed rod 44 is placed in the mounting groove 213, two No. 2 springs 45 are provided, the two No. 2 springs 45 are sleeved outside the No. 2 fixed rod 44, the two No. 2 springs 45 are placed on both sides of the No. 2 slider 43, the clamping block 46 and the connecting seat 42 are fixedly connected, the retaining plate 5 is provided with a No. 4 sliding groove 51, and the clamping block 46 and the retaining plate 5 are slidably connected.

[0049] The retaining plate 5 is supported obliquely by the support rod 41. When the pressure on the retaining plate 5 changes, the support rod 41 slides under the action of the No. 2 slider 43 and the block 46 connected to the connecting seat 42, and the No. 2 spring 45 on both sides of the No. 2 slider 43 generates an elastic force opposite to it, pushing the support rod 41 back to its original angle or to a new equilibrium position, thereby realizing automatic adjustment of the support angle of the support rod 41, so that the soil pressure and other external forces on the side wall of the foundation pit can be more evenly transmitted to the retaining plate 5, so that it always maintains the best supporting effect, thereby reducing the deformation and displacement of the side wall, ensuring the stability of the foundation pit, and protecting the safety of the subway tunnel below.

[0050] like Fig. 9 As shown, the guide mechanism 6 includes a hydraulic cylinder 61, a connecting block 62 and a sleeve 63, the hydraulic cylinder 61 is fixedly connected to the mounting plate 1, the output end of the hydraulic cylinder 61 is fixedly connected to the connecting block 62, and the sleeve 63 is fixedly connected to the connecting block 62.

[0051] The connecting block 62 is driven to move by the output end of the hydraulic cylinder 61, so that the connecting block 62 drives the casing 63 to move to the drilling position. The casing 63 provides precise guidance for the rotary drilling rig to ensure that the drilling rig drills along the predetermined position and direction to avoid deviation during the drilling process. At the same time, the casing 63 can follow up the construction and support the hole wall in time to prevent the hole wall from collapsing.

[0052] like Figure 1 , Fig. 9 and Fig.10 As shown, the dust removal mechanism 7 includes a water tank 71, a water pump 72, a nozzle 73 and a No. 3 fixed rod 74. The water tank 71 and the water pump 72 are connected by pipelines, the water pump 72 and the nozzle 73 are connected by pipelines, the No. 3 fixed rod 74 and the nozzle 73 are fixedly connected, the No. 3 fixed rod 74 and the connecting block 62 are fixedly connected, the nozzle 73 is annular, and the nozzle 73 is provided with a plurality of water outlets 731, and the water outlets 731 face the sleeve 63.

[0053] The water in the water tank 71 is pumped by a water pump 72, and the water pump 72 is connected to the nozzle 73 through a pipeline, so that the water is transported to the nozzle 73. The nozzle 73 sprays water at the entrance of the casing 63, so that the dust is adsorbed and moistened by the water, and quickly aggregates into larger particles, thereby preventing the dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum. At the same time, the nozzle 73 is provided with a plurality of water outlets 731, and the water outlets 731 face the casing 63, so that a water curtain is formed at the entrance of the casing 63, thereby reducing the amount of dust generated and preventing the dust from spreading outward.

[0054] Working principle: by providing a universal wheel 8 on the protective device, the protective device is moved to the specified position, and the transmission rod 23 is driven to rotate by the motor 22, so that the shell 241 and the nut seat 251 move downward, and the spiral blade 242 rotates with the shell 241 and screws into the ground, forming a tight bite with the surrounding soil. The No. 1 fixed rod 253 drives the driving member 255 to move downward, and the sliding rod 256 slides downward. When the sliding rod 256 moves to the bottom of the No. 1 sliding groove 212, the nut seat 251 continues to move downward, and the driving member 255 rotates along the axis of the sliding rod 256, so that the grab hook 254 rotates along the hinge and hooks the ground, so that the protective device is fixed, and the foundation pit is supported by the retaining plate 5, and the retaining plate 5 is obliquely supported by the support rod 41. When the pressure on the retaining plate 5 changes, the support rod 41 is connected to the No. 2 sliding block connected to the connecting seat 42 Under the action of 43 and the block 46, the support rod 41 slides, and the No. 2 spring 45 on both sides of the No. 2 slider 43 and the No. 2 slider 43 generate an opposite elastic force, pushing the support rod 41 back to the original angle or reaching a new equilibrium position, realizing the automatic adjustment of the support angle of the support rod 41, so that the earth pressure and other external forces exerted on the foundation pit can be more evenly transmitted to the retaining plate 5. When digging holes for bridge pile foundations, the casing 63 is driven to move to the drilling position by the hydraulic cylinder 61, providing precise guidance for the rotary drilling rig to ensure that the drilling rig drills along the predetermined position and direction, and the water in the water tank 71 is pumped by the water pump 72, so that the nozzle 73 sprays water at the entrance of the casing 63, so that the dust is absorbed and moistened by the water, and quickly gathers into larger particles, preventing dust from gradually penetrating into the space where the subway tunnel is located from various pores and cracks in the stratum.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety protection device for bridge pile foundation construction near a subway tunnel, characterized in that: The protective device comprises a mounting plate (1), a fixing mechanism (2), a buffer mechanism (3), a diagonal bracing mechanism (4), a retaining plate (5), a guide mechanism (6), a dust removal mechanism (7) and a universal wheel (8); the mounting plate (1) is fixedly connected to the fixing mechanism (2); the buffer mechanism (3) is fixedly connected to the mounting plate (1); two diagonal bracing mechanisms (4) are provided, and the two diagonal bracing mechanisms (4) are fixedly connected to the fixing mechanism (2); the retaining plate (5) is slidably connected to the two diagonal bracing mechanisms (4); the retaining plate (5) is abutted against the buffer mechanism (3); the guide mechanism (6) is fixedly connected to the mounting plate (1); the dust removal mechanism (7) is fixedly connected to the mounting plate (1); and four universal wheels (8) are provided, and the four universal wheels (8) are rotatably connected to the fixing mechanism (2).

2. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 1 is characterized by: The fixing mechanism (2) comprises a fixing seat (21), a motor (22), a transmission rod (23), a fixing piece (24) and an anchoring unit (25); the fixing seat (21) and the motor (22) are fixedly connected; the output end of the motor (22) and the transmission rod (23) are fixedly connected; the transmission rod (23) and the fixing piece (24) are threadedly connected; and the anchoring unit (25) and the transmission rod (23) are threadedly connected.

3. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 2 is characterized in that: The anchoring unit (25) comprises a nut seat (251), a guide rod (252), a first fixing rod (253), a grab hook (254), a driving member (255) and a sliding rod (256); the nut seat (251) and the transmission rod (23) are threadedly connected; the guide rod (252) and the nut seat (251) are fixedly connected; the fixing seat (21) is provided with a guide groove (211); the guide rod (252) and the guide groove (211) are slidably connected; the first fixing rod (253) and the nut seat (251) are fixedly connected; the grab hook (254) and the nut seat (251) are hingedly connected; the driving member (255) and the sliding rod (256) are rotatably connected; the fixing seat (21) is provided with a first sliding groove (212); the sliding rod (256) and the first sliding groove (212) are slidably connected.

4. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 3 is characterized by: The fixing member (24) comprises a housing (241), a spiral blade (242), a conical base (243) and a first sliding block (244); the housing (241) and the spiral blade (242) are fixedly connected; the conical base (243) and the housing (241) are fixedly connected; the housing (241) is provided with a second sliding groove (2411); the first sliding block (244) and the second sliding groove (2411) are slidably connected; the first sliding block (244) and the nut seat (251) are fixedly connected; and the second sliding groove (2411) is an annular groove.

5. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 1 is characterized in that: The buffer mechanism (3) comprises a sleeve (31), a slide rod (32) and a first spring (33); the sleeve (31) and the mounting plate (1) are fixedly connected; the sleeve (31) and the slide rod (32) are slidably connected; and the first spring (33) is sleeved outside the slide rod (32).

6. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 5 is characterized by: The diagonal bracing mechanism (4) comprises a supporting rod (41), a connecting seat (42), a second sliding block (43), a second fixing rod (44), a second spring (45) and a clamping block (46); the supporting rod (41) and the connecting seat (42) are hingedly connected; the second sliding block (43) and the connecting seat (42) are fixedly connected; the second sliding block (43) is provided with a third sliding groove (431); the second fixing rod (44) and the third sliding groove (431) are slidably connected; the fixing seat ( 21) is provided with a mounting groove (213), the No. 2 fixing rod (44) is placed in the mounting groove (213), two No. 2 springs (45) are provided, the two No. 2 springs (45) are sleeved outside the No. 2 fixing rod (44), the two No. 2 springs (45) are placed on both sides of the No. 2 sliding block (43), the clamping block (46) and the connecting seat (42) are fixedly connected, the retaining plate (5) is provided with a No. 4 sliding groove (51), and the clamping block (46) and the retaining plate (5) are slidably connected.

7. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 6 is characterized by: The guide mechanism (6) comprises a hydraulic cylinder (61), a connecting block (62) and a sleeve (63); the hydraulic cylinder (61) is fixedly connected to the mounting plate (1); the output end of the hydraulic cylinder (61) is fixedly connected to the connecting block (62); and the sleeve (63) is fixedly connected to the connecting block (62).

8. The safety protection device for bridge pile foundation construction near a subway tunnel according to claim 7 is characterized in that: The dust removal mechanism (7) comprises a water tank (71), a water pump (72), a nozzle (73) and a third fixed rod (74); the water tank (71) and the water pump (72) are connected by a pipeline; the water pump (72) and the nozzle (73) are connected by a pipeline; the third fixed rod (74) and the nozzle (73) are fixedly connected; the third fixed rod (74) and the connection block (62) are fixedly connected; the nozzle (73) is annular; the nozzle (73) is provided with a plurality of water outlets (731); and the water outlets (731) face the sleeve (63).

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