A falling prevention device and method suitable for opening a well lid

Abstract

The application discloses a falling-prevention device suitable for opening of a well lid, which comprises a cover plate located above a well mouth, and a synthetic fiber mesh bag arranged below the cover plate at the well mouth. The application also discloses a falling-prevention method suitable for opening of a well lid. The application effectively solves the safety hidden trouble caused by the absence or failure of a traditional falling-prevention system after the opening of the falling-prevention system, and the method has a wide application range and higher safety, and can be widely applied in the field of municipal engineering construction.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering construction, and in particular to a device and method for preventing manhole covers from falling out when opened. Background Technology

[0002] Falls from heights are the leading cause of death in the construction industry, consistently ranking first among the "five major injuries" and accounting for over 60% of all accidents. In some regions, the proportion of falls from heights on construction sites is extremely high. In municipal engineering construction, traditional fall prevention measures primarily rely on the manhole covers themselves, often using heavy-duty ductile iron covers supplemented with locks, hinges, or anti-theft devices to reduce the risk of loss by increasing weight and connection methods. Some cities install simple cast iron gratings or welded wire mesh inside manholes, but these are often non-standard components and installed haphazardly. Some even use double-layer manhole covers, with a lightweight pressure-bearing cover plate added underneath the main cover. These manhole covers are often exposed and unattended. While traditional methods are simple in structure and low in cost, they generally lack reliable secondary protection, posing a significant safety hazard if opened by unauthorized personnel. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a device and method for preventing falls when opening manhole covers, which effectively solves the safety hazards caused by the absence or failure of the traditional fall prevention system once it is opened. This method has a wide range of applications and higher safety.

[0004] The present invention provides a device for preventing manhole covers from falling when opened, comprising a cover plate located above the manhole opening, and a synthetic fiber mesh bag provided at the manhole opening below the cover plate.

[0005] In the above technical solution, a steel ring is provided below the cover plate. The steel ring is embedded with multiple sliding parts that can move circumferentially along the steel ring and a fixed part fixed to the steel ring. The synthetic fiber net bag is an open-type net bag. One end of the open-type net bag is connected to the fixed part and the other end is connected to a sliding part adjacent to the fixed part. The top of the steel ring is provided with a conveyor platform that is radially connected to the middle of the machine body and the steel ring. The conveyor platform is located on one side of the fixed part. Guide rails are provided on both sides of the top of the conveyor platform. A slider that slides with the guide rails is provided axially on the top of the conveyor platform. A traction rope made of steel wire is provided on the outside of the slider. One end of the traction rope passes around the steering mechanism and is connected to the side of the cover plate that is at the higher position when it is lifted. The end of the slider is provided with a conveyor rod that is hinged to it at one end. The other end of the conveyor rod is connected to the sliding part closest to the conveyor platform by bolt hinge.

[0006] In the above technical solution, each sliding member is provided with two connecting rods that are hinged to it. Each connecting rod is hinged to the end of the connecting rod on the nearest adjacent sliding member through a connecting shaft. The fixing member is hinged to the sliding member on one side through the connecting shaft at the end of the connecting rod. The fixing member and the sliding member on the other side are respectively arranged on both sides of the conveyor table and separated by the conveyor table.

[0007] In the above technical solution, the open-type net bag consists of a circular net bag located at the center and multiple synthetic fiber ropes with both ends connected to the corresponding connecting shafts and the net bag respectively. The opening of the open-type net bag is formed between the fixing parts and the sliding parts on both sides of the conveyor platform.

[0008] In the above technical solution, the steel ring is composed of an inner steel ring and an outer steel ring, and the inner and outer sides of the fixing member are fixedly connected to the inner steel ring and the outer steel ring respectively. The inner and outer sides of each sliding member are slidably engaged with the guide grooves provided on the opposite surfaces of the inner steel ring and the outer steel ring respectively.

[0009] In the above technical solution, a square frame is provided below the cover plate, the steel ring is located inside the square frame and the outer side of the steel ring is fixedly connected to the inner side of the square frame, one side of the cover plate is hinged to one side of the square frame through a rotating shaft, and the steering mechanism is located on the side of the square frame corresponding to the conveyor table.

[0010] In the above technical solution, the steering mechanism has a Y-shaped cantilever that is perpendicularly connected to the corresponding side of the square frame. The two forked arms of the cantilever are respectively provided with fixed pulley B and fixed pulley A. The corresponding side is provided with a rotating shaft on one side of the cantilever. The end of the rotating shaft away from the corresponding side is provided with a movable pulley. The corresponding side of the square frame is provided with a through hole at the position opposite to the fixed pulley B arm. The traction rope passes through the through hole and passes through the fixed pulley B, fixed pulley A and movable pulley in sequence. The traction rope is a wire rope and its end is fixedly connected to the high edge when the cover plate is lifted by a pin.

[0011] In the above technical solution, a sliding bearing is provided in the middle of the top of the conveyor table along the axial direction, and the middle part of the slider is slidably engaged with the sliding bearing.

[0012] In the above technical solution, the square frame is composed of crossbeams on both sides, supports at one end of the two crossbeams, and brackets at the other end of the two crossbeams. The cantilever and the rotation shaft are respectively connected to the bracket.

[0013] This invention also provides a method for preventing falls when opening manhole covers, comprising the following steps: S1, when the cover is opened, the steel wire rope at the pin begins to move upward, passing sequentially around the movable pulley, fixed pulley A, and fixed pulley B; S2, then the steel wire rope pulls the traction rope towards fixed pulley B through the through hole on the bracket, the traction rope drives the slider to move towards the bracket, and then drives the entire transmission rod to move towards the bracket; S3, the originally gathered sliding parts disperse inside the steel ring, the fixed parts, as the starting point of the sliding mechanism, are fixed on the inner and outer steel rings, and after each connecting rod extends, the synthetic fiber net basically covers the hollow part, producing a fall prevention effect.

[0014] This invention relates to a device and method for preventing manhole covers from falling out, and has the following beneficial effects: This invention uses a pulley system to drive a traction rope, which in turn causes a slider to drive a transmission rod, ultimately causing the connecting rod to open the net and activate the automatic fall protection system. This solves the safety hazard caused by the absence or failure of the fall protection system once it is activated in traditional systems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure 1 of the manhole cover opening anti-fall device of the present invention; Figure 2 This is a schematic diagram of the structure 2 of the manhole cover opening anti-fall device of the present invention; Figure 3 This is a schematic diagram of the process for the method of preventing manhole covers from falling out, applicable to the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but these embodiments should not be construed as limiting the present invention.

[0017] This invention provides an automatic fall protection technology applicable to the opening of circular wells. The invention uses a pulley system to drive a traction rope 13, which in turn causes a slider 14 to drive a transmission rod 15, ultimately causing a connecting rod 23 to open the safety net, thus activating the automatic fall protection system. This solves the safety hazard caused by the absence or failure of traditional fall protection systems once activated.

[0018] Example 1 See Figures 1 to 2 The present invention is applicable to a manhole cover opening and anti-fall device, including a cover plate 4 located above the manhole opening, and a synthetic fiber mesh bag provided at the manhole opening below the cover plate 4.

[0019] Example 2 This embodiment is basically the same as Embodiment 1, except that: See Figures 1 to 2Below the cover plate 4, there is a steel ring. The steel ring is fitted with a plurality of sliding parts 22 that can move around the circumference of the steel ring and a fixing part 21 fixed on the steel ring. The synthetic fiber net bag is an open-type net bag. One end of the open-type net bag is connected to the fixing part 21 and the other end is connected to a sliding part 22 adjacent to the fixing part 21. The top of the steel ring is provided with a conveyor platform 18 that is radially connected to the middle of the machine body and the steel ring. The conveyor platform 18 is located on one side of the fixing part 21. The top of the conveyor platform 18 is provided with guide rails 20 on both sides. The top of the conveyor platform 18 is provided with a slider 14 that slides with the guide rails 20 along the axial direction. The outside of the slider 14 is provided with a traction rope 13 made of steel wire. One end of the traction rope 13 passes around the turning mechanism and is connected to the side of the cover plate 4 that is at the higher position when it is lifted. The end of the slider 14 is provided with a conveyor rod 15 that is hinged to it at one end. The other end of the conveyor rod 15 is hinged to the sliding part 22 closest to the conveyor platform 18 by bolts 16.

[0020] Each slider 22 is provided with two connecting rods 23 that are hinged to it. Each connecting rod 23 is hinged to the end of the connecting rod 23 on the nearest adjacent slider 22 through a connecting shaft 24. The fixing member 21 is hinged to the slider 22 on one side through the connecting shaft 24 at the end of the connecting rod 23. The fixing member 21 and the slider 22 on the other side are respectively arranged on both sides of the conveyor table 18 and separated by the conveyor table 18.

[0021] The open-type net bag consists of a circular net 27 located at the center and multiple synthetic fiber ropes 25 whose ends are respectively connected to the corresponding connecting shafts 24 and net 27. The opening of the open-type net bag is formed between the fixing members 21 and the sliding members 22 on both sides of the conveyor platform 18.

[0022] The steel ring is composed of an inner steel ring 26 and an outer steel ring 17. The inner and outer sides of the fixing member 21 are fixedly connected to the inner steel ring 26 and the outer steel ring 17 respectively. The inner and outer sides of each sliding member 22 are slidably engaged with the guide grooves provided on the opposite surfaces of the inner steel ring 26 and the outer steel ring 17 respectively.

[0023] A square frame is provided below the cover plate 4. The steel ring is located inside the square frame and the outer side of the steel ring is fixedly connected to the inner side of the square frame. One side of the cover plate 4 is hinged to one side of the square frame through a rotating shaft 3. The steering mechanism is located on the side of the square frame corresponding to the conveyor table 18.

[0024] The steering mechanism has a Y-shaped cantilever 12 that is perpendicularly connected to the corresponding side of the square frame. The two forked arms of the cantilever 12 are respectively provided with fixed pulleys B8 and A7. The corresponding side is provided with a rotating shaft 11 on one side of the cantilever 12. The end of the rotating shaft 11 away from the corresponding side is provided with a movable pulley 6. The corresponding side of the square frame is provided with a through hole at the position opposite to the fixed pulley B8 arm. The traction rope 13 passes through the through hole and passes through the fixed pulley B8, fixed pulley A7 and movable pulley 6 in sequence. The traction rope 13 is a steel wire rope 9, and its end is fixedly connected to the high edge of the cover plate 4 when it is lifted by a pin 10.

[0025] The top center of the conveyor 18 is provided with a sliding bearing 19 along the axial direction, and the middle part of the slider 14 is slidably engaged with the sliding bearing 19.

[0026] The square frame consists of two side beams 1, supports 2 at one end of the two beams 1, and brackets 5 at the other end of the two beams 1. The cantilever 12 and the rotating shaft 11 are respectively connected to the brackets 5.

[0027] This embodiment applies to the manhole cover opening anti-fall device, which can effectively solve the safety hazards caused by the absence or failure of the traditional anti-fall system once it is opened. This device has a wide range of applications and higher safety.

[0028] Example 3 See Figure 3 This invention relates to a method for preventing manhole covers from falling out when opened, comprising the following steps: S1. When the cover plate 4 is opened, the steel wire rope 9 at the pin 10 begins to move upward, and the steel wire rope 9 passes through the movable pulley 6, the fixed pulley A7, and the fixed pulley B8 in sequence. S2. Then the wire rope 9 pulls the traction rope 13 towards the fixed pulley B8 through the through hole on the bracket 5. The traction rope 13 drives the slider 14 to move towards the bracket 5, and then drives the transmission rod 15 to move towards the bracket 5 as a whole. S3. The originally gathered sliding parts 22 are dispersed inside the steel ring. The fixed part 21, as the starting point of the sliding mechanism, is fixed on the inner steel ring 26 and the outer steel ring 17. After each connecting rod 23 is extended, the synthetic fiber net basically covers the hollow part, producing a fall prevention effect.

[0029] Example 4 This embodiment is basically the same as embodiment 3, except that: like Figures 1 to 2 As shown, the present invention provides an automatic fall prevention method for opening circular wells, the technical solution of which is as follows: The support components of this fall protection method mainly consist of a crossbeam 1, a support 2, and a bracket 5. The support 2 is made of a steel plate. Two crossbeams 1 are welded to the support, and the other end is welded to the other end of the crossbeam 1 by the bracket 5. The bracket 5 and the crossbeam 1 can also be made of steel plate.

[0030] A cover plate 4 is installed on one side of the crossbeam 1. The cover plate 4 is used to open. The cover plate 4 is connected to the crossbeam 1 by a rotating shaft 3. After the cover plate 4 is opened, the cover plate 4 can be rotated around the rotating shaft 3. A movable pulley 6 and a cantilever 12 are installed on the side of the bracket 5. Fixed pulleys A7 and B8 are installed on the cantilever 12 in sequence. A through hole is set in the center of the bracket 5 as much as possible, and the traction rope 13 passes through it.

[0031] When the cover plate 4 is opened, the steel wire rope 9 at the pin 10 begins to move. The steel wire rope 9 first passes around the movable pulley 6, which is located on the rotating shaft 11, allowing the movable pulley 6 to rotate freely 360 degrees. After the steel wire rope 9 is led out from the movable pulley 6, it passes around the fixed pulley A7 and the fixed pulley B8 in sequence, and then passes through the through hole on the bracket 5. At this time, the steel wire rope 9 mainly serves as the traction rope 13 of the fall protection system.

[0032] After the traction rope 13 is led out from the bracket 5, it drives the fall protection system as a power system. The fall protection system mainly consists of a left circular automatic telescopic structure and a right sliding structure. The sliding structure is located on the conveyor table 18, and a slider 14 is set on top. The slider 14 can slide left and right along the guide rail 20. A sliding bearing 19 is set in the middle of the slider 14, which mainly serves to fix the direction of movement. One end of the slider 14 is connected to the sliding member 22 through the conveyor rod 15. The conveyor rod 15 is fixed to the sliding member 22 by bolts 16.

[0033] The circular automatic telescopic structure support component consists of an outer steel ring 17 and an inner steel ring 26. Six sliding parts 22 are set in the middle of the steel ring. Each sliding part 22 is equipped with two connecting rods 23. The adjacent connecting rods 23 between two sliding parts 22 are connected at the other end by a connecting shaft 24. A net 27 is set in the middle position. The net 27 is connected to the connecting shaft 24 by a synthetic fiber rope 25.

[0034] When the cover plate 4 is activated, it drives the traction rope 13 to move. The traction rope 13 drives the slider 14 to move to the right. The slider 14 drives the transmission rod 15 to move, which allows the originally gathered sliding parts 22 to disperse inside the steel ring. The starting part of the sliding mechanism is the fixed part 21, which is fixed on the steel ring and does not move. After the connecting rod 23 on the sliding part 22 extends, the net 27 basically covers the hollow part, producing a fall prevention effect.

[0035] The synthetic fiber rope 25 has high tensile strength and wear resistance. The net 27 is also made of synthetic material. Since the net 27 is connected to the connecting shaft 24 by the synthetic fiber rope, it is easy to replace later. The automatic telescopic structure of the ring and the right sliding structure are set in the middle of the two crossbeams 1. When the cover plate 4 is started and finally drives the net 27 to unfold, the cover plate 4 is closed. A drive motor (not shown in the figure) can be set on the conveyor table 18 to reset the slider 14.

[0036] Technical principles and innovations: 1. This invention mainly involves the cover plate 4 being activated, which drives the traction rope 13 through the pulley system. The traction rope 13 causes the slider 14 to drive the transmission rod 15, ultimately causing the connecting rod 23 to open the net, thus activating the automatic fall protection system. This solves the safety hazards caused by the absence or failure of the fall protection system once it is activated in traditional fall protection systems. The operation is safe and reliable, and the fall protection system is automatically activated once activated. It is simple to manufacture and is worthy of application in various municipal engineering and building construction fields.

[0037] 2. Since the fall protection system is composed of inner and outer steel rings, and moves around the center during the deployment process, this invention is suitable for use in various types of circular wells, solving the problem that traditional methods have narrow applicability and poor performance after application.

[0038] 3. This construction method uses only common construction materials, such as steel plates and connecting rods 23 commonly used in production. Compared with materials with complex similar mechanisms, this invention is simple to manufacture, fully automatic in operation, and has high economic value.

[0039] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A device for preventing fall when opening a manhole cover, comprising a cover plate (4) located above the manhole opening, characterized in that: A synthetic fiber mesh is provided at the wellhead below the cover plate (4).

2. The anti-fall device for opening manhole covers according to claim 1, characterized in that: A steel ring is provided below the cover plate (4). The steel ring is fitted with a plurality of sliding parts (22) that can move circumferentially along the steel ring and a fixing part (21) fixed on the steel ring. The synthetic fiber mesh bag is an open mesh bag. One end of the open mesh bag is connected to the fixing part (21) and the other end is connected to a sliding part (22) adjacent to the fixing part (21). A conveyor platform (18) is provided at the top of the steel ring along the radial direction and connected to the middle of the machine body. The conveyor platform (18) is located on one side of the fixing part (21). The top two sides are provided with guide rails (20). The top of the conveyor platform (18) is provided with a slider (14) that slides with the guide rails (20) along the axial direction. The outside of the slider (14) is provided with a traction rope (13) made of steel wire. One end of the traction rope (13) passes around the steering mechanism and is connected to the side of the cover plate (4) that is at the high position when it is lifted. The end of the slider (14) is provided with a conveyor rod (15) that is hinged to it. The other end of the conveyor rod (15) is hinged to the sliding part (22) closest to the conveyor platform (18) by bolts (16).

3. The anti-fall device for opening manhole covers according to claim 2, characterized in that: Each slider (22) is provided with two connecting rods (23) that are hinged to it. Each connecting rod (23) is hinged to the end of the connecting rod (23) on the nearest adjacent slider (22) through a connecting shaft (24). The fixing member (21) is hinged to the slider (22) on one side through the connecting shaft (24) at the end of the connecting rod (23). The fixing member (21) and the slider (22) on the other side are respectively set on both sides of the conveyor (18) and separated by the conveyor (18).

4. The fall prevention device for opening manhole covers according to claim 3, characterized in that: The open-type net bag consists of a circular net (27) located at the center and multiple synthetic fiber ropes (25) with their ends connected to the corresponding connecting shaft (24) and net (27) respectively. The opening of the open-type net bag is formed between the fixing member (21) and the sliding member (22) on both sides of the conveyor (18).

5. The fall prevention device for opening manhole covers according to claim 4, characterized in that: The steel ring is composed of an inner steel ring (26) and an outer steel ring (17). The inner and outer sides of the fixing member (21) are fixedly connected to the inner steel ring (26) and the outer steel ring (17) respectively. The inner and outer sides of each sliding member (22) are slidably engaged with the guide grooves provided on the opposite surfaces of the inner steel ring (26) and the outer steel ring (17) respectively.

6. The fall prevention device for opening manhole covers according to claim 5, characterized in that: The cover plate (4) is provided with a square frame below it. The steel ring is located inside the square frame and the outer side of the steel ring is fixedly connected to the inner side of the square frame. One side of the cover plate (4) is hinged to one side of the square frame through a rotating shaft (3). The steering mechanism is located on the side of the square frame corresponding to the conveyor table (18).

7. The fall prevention device for opening manhole covers according to claim 6, characterized in that: The steering mechanism has a Y-shaped cantilever (12) that is perpendicularly connected to the corresponding side of the square frame. The two forked arms of the cantilever (12) are respectively provided with fixed pulleys B (8) and A (7). The corresponding side is provided with a rotating shaft (11) on one side of the cantilever (12). The end of the rotating shaft (11) away from the corresponding side is provided with a movable pulley (6). The corresponding side of the square frame is provided with a through hole opposite to the fixed pulley B (8) arm. The traction rope (13) passes through the through hole and passes through the fixed pulley B (8), fixed pulley A (7), and movable pulley (6) in sequence. The traction rope (13) is a wire rope (9) and its end is fixedly connected to the high edge of the cover plate (4) when it is lifted by a pin (10).

8. The fall prevention device for opening manhole covers according to claim 7, characterized in that: The top center of the conveyor (18) is provided with a sliding bearing (19) along the axial direction, and the middle part of the slider (14) is in sliding engagement with the sliding bearing (19).

9. The fall prevention device for opening manhole covers according to claim 8, characterized in that: The square frame is composed of two horizontal beams (1), supports (2) at one end of the two horizontal beams (1) and brackets (5) at the other end of the two horizontal beams (1). The cantilever (12) and the rotating shaft (11) are respectively connected to the brackets (5).

10. A method for preventing falls when opening manhole covers, characterized in that: Includes the following steps: S1. When the cover plate (4) is opened, the steel wire rope (9) at the pin (10) begins to move upward, and the steel wire rope (9) passes around the movable pulley (6), fixed pulley A (7), and fixed pulley B (8) in sequence. S2. Then the wire rope (9) pulls the traction rope (13) towards the fixed pulley B (8) through the through hole on the bracket (5). The traction rope (13) drives the slider (14) to move towards the bracket (5), and then drives the transmission rod (15) to move towards the bracket (5) as a whole. S3. The sliding parts (22) that were originally gathered together are dispersed inside the steel ring. The fixing part (21) is fixed on the inner steel ring (26) and the outer steel ring (17) as the starting point of the sliding mechanism. After each connecting rod (23) is extended, the synthetic fiber net basically covers the hollow part, producing a fall prevention effect.

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