A type of anti-throw net for bridges spanning operational railway lines

Abstract

This invention belongs to the technical field of railway anti-throw nets, specifically relating to an anti-throw net for bridges crossing operational railway lines. It includes a detachable base plate mounted on a concrete guardrail, uprights mounted on the base plate, a mesh panel installed between two uprights, and a side seat located inside the concrete guardrail. A corner extension mechanism is provided between the side seat and the base plate. This corner extension mechanism includes a pivot structure and a straight section connected to the pivot structure. The straight section is slidably connected to either the base plate or the side seat. Therefore, after the base plate is removed from the concrete guardrail, it can be rotated and its height changed by rotating the pivot structure and sliding the straight section, thus allowing the uprights to stand upright. This invention maintains the connection between the anti-throw net and the concrete guardrail after removal through the corner extension mechanism, preventing workers from accidentally dropping the anti-throw net and ensuring the safety of pedestrians and vehicles below.

Description

Technical Field

[0001] This invention belongs to the technical field of railway anti-throw nets, specifically relating to an anti-throw net for bridges crossing operational railway lines. Background Technology

[0002] With the development of social technology and the continuous improvement of living standards, public facilities for protecting people's lives and property are becoming increasingly complete and widely used in various fields. On urban roads and highways, overpasses and pedestrian bridges are being used more and more frequently for the safety of vehicles and pedestrians. To prevent objects thrown from bridges by pedestrians and vehicles from falling and causing personal injury, affecting normal vehicle traffic, or causing secondary injuries, and to improve the safety and protective performance of bridges, anti-throw nets have been developed.

[0003] Railway crossings with other railways or highways typically involve underpasses or overpasses. Installing various types of safety nets on overpasses of existing railway lines, highways, trunk roads, rural roads, and pedestrian bridges not only protects the lives and property of people on the bridge but, more importantly, ensures the safety of vehicles passing on the highway and trains below. With the increase in operational railway lines, the number of intersections with highways, trunk roads, and local roads is also increasing. Along with the increase in train speeds and the improvement of highway standards, the safety requirements at these intersections are constantly rising.

[0004] The maintenance and replacement of anti-throw netting above operating railway lines involves strict procedures. First, construction permits must be obtained, and work can only proceed when trains on the operating line are stopped and the safety of the overhead contact line, other facilities, and personnel below is ensured. The procedures are complex, involve many aspects, and are quite challenging. Anti-throw netting is a major, easily damaged component, and during the twice-yearly bridge inspections, the posts and netting panels need to be completely removed. During removal, the posts and netting panels must not fall and must not endanger the safety of personnel and railway facilities below.

[0005] Currently, when bridge inspection vehicles inspect anti-throw nets, the posts and netting must be completely removed from the concrete guardrails and then placed next to the guardrails or moved to a location away from the inspection vehicles. However, during the removal and installation of anti-throw nets, since there is no other protection on the outside of the concrete guardrails, if workers make a mistake, the posts or netting may fall onto the road below, affecting the safety of vehicles and pedestrians. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bridge anti-throw net that crosses an operational railway line, which can prevent the anti-throw net from falling off during bridge inspection and disassembly by bridge inspection vehicles.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A bridge anti-throw net spanning an operational railway line includes a detachable base plate seat mounted on a concrete guardrail, uprights mounted on the base plate seat, a mesh panel installed between two uprights, and a side seat located inside the concrete guardrail. A corner extension mechanism is provided between the side seat and the base plate seat. The corner extension mechanism includes a pivot structure and a straight section connected to the pivot structure. The straight section is slidably connected to the base plate seat or the side seat. Thus, after the base plate seat is removed from the concrete guardrail, it can be flipped and its height changed by rotating the pivot structure and sliding the straight section, thereby inverting the uprights.

[0009] Furthermore, the side seat is provided with a vertically penetrating positioning sliding hole, and a lower arm is slidably inserted through the positioning sliding hole as a straight structure. The end of the lower arm is provided with a locking component with a size larger than the inner diameter of the positioning sliding hole. An upper arm is fixedly installed on the side of the base plate facing the inside of the bridge. The pivot structure includes an upper shaft and a rotating seat rotatably sleeved outside the upper shaft. The upper shaft is fixed to the free end of the upper arm, and the rotating seat is fixed to the upper end of the lower arm. Thus, after the base plate is removed from the concrete guardrail, the base plate can be raised and flipped up and down by moving the lower arm upward and rotating the pivot structure.

[0010] Furthermore, the locking component is detachably mounted on the lower arm; the locking component is a spring pin, pin, bolt, or nut threadedly connected to the end of the lower arm and passing through the lower arm.

[0011] Furthermore, the side seat is located on the upper part of the concrete guardrail.

[0012] Furthermore, the base plate is provided with a sliding arm hole, which extends along the thickness direction of the concrete guardrail; the pivot structure includes an upper shaft and a rotating seat rotatably sleeved outside the upper shaft, one end of the straight structure is slidably connected in the sliding arm hole, the other end of the straight structure is fixed on the upper shaft, and the rotating seat is directly fixed on the side seat, so that after the base plate is removed from the concrete guardrail, the base plate can be raised and flipped up and down by rotating the pivot and sliding the straight structure.

[0013] Furthermore, a fixing plate is provided on the inner side of the concrete guardrail as a side seat, and the fixing plate is composed of two horizontally symmetrical sub-plates; there are two rotating seats, which are located at both ends of the upper shaft, and one rotating seat is provided on each sub-plate.

[0014] Furthermore, the sliding arm hole is open on the side near the concrete guardrail, and a sealing component that can seal the open end of the sliding arm hole is detachably provided on the base plate.

[0015] Furthermore, the straight structure includes a sliding shaft that moves within the sliding arm hole, anti-detachment components fixed at both ends of the sliding shaft, and a movable arm fixed in the middle of the sliding shaft, with one end of the movable arm fixed on the upper shaft and the other end of the movable arm fixed on the upper shaft.

[0016] Furthermore, a top cover is provided on the base plate, and a notch is provided on the side of the top cover facing the side seat. The position of the notch corresponds to the end of the sliding arm hole. Only after the sliding shaft moves to the position of the notch can the straight structure rotate relative to the sliding arm hole.

[0017] Furthermore, steel pipes are pre-embedded in the concrete guardrail at a depth of 30cm to 40cm; the steel pipes are vertically arranged, and a flange base plate is connected to the top of the steel pipes; the lower end of the post is inserted into the steel pipe, and the base plate is bolted to the flange base plate; several fixing lugs are threaded through and welded on the post, and the fixing lugs are bolted to the frame of the mesh; after connection, the distance between the post and the mesh frame is 0.5cm; the mesh is made of low carbon steel wire or aluminum-magnesium alloy wire through powder coating and welding.

[0018] The beneficial effects of this invention are:

[0019] This invention incorporates a corner extension mechanism between the base plate and the side plate. This corner extension mechanism is rotatable and can move relative to either the base plate or the side plate. This allows the column to maintain its connection with the concrete guardrail when it is removed, preventing workers from accidentally dropping the anti-throw net and ensuring the safety of pedestrians and vehicles below. Furthermore, when removing or replacing the anti-throw net, it can be folded inwards before removal to prevent it from falling.

[0020] Furthermore, the corner extension mechanism can provide traction for the top of the inverted column, allowing the lower part of the column to rest against the bottom of the concrete guardrail. This prevents the anti-throw net from collapsing after being inverted and keeps it basically upright, freeing up space for the folding arm of the bridge inspection vehicle. Workers do not need to move the net around, saving manpower. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 2 This is a side view of the column structure after it has been inverted according to Embodiment 1 of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of a lower arm according to Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0026] Figure 5 This is a side view of the column structure after it has been inverted according to Embodiment 2 of the present invention.

[0027] Figure 6 This is a schematic diagram of the sealing component in Embodiment 2 of the present invention.

[0028] Figure 7 This is a schematic diagram of the main structure of the anti-throw net according to an embodiment of the present invention.

[0029] In the diagram, 1. Concrete guardrail; 2. Base plate; 3. Post; 4. Upper shaft; 5. Rotary seat; 6. Upper arm; 7. Positioning cylinder; 71. Support; 8. Lower arm; 9. Locking component; 10. Sliding arm hole; 11. Sliding shaft; 12. Anti-detachment component; 13. Top cover; 14. Boom; 15. Fixing plate; 16. Fixing hole; 17. Support plate; 18. Plug; 19. Connecting piece; 20. Steel pipe. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

[0031] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Example 1

[0034] like Figures 1 to 3 , Figure 7 As shown, a bridge anti-throw net for crossing an operational railway line includes a base plate 2 detachably mounted on a concrete guardrail 1, columns 3 mounted on the base plate 2, a mesh panel installed between two columns 3, and a side seat mounted on the inner side of the concrete guardrail 1; a corner extension mechanism is provided between the side seat and the base plate 2, and the corner extension mechanism includes a pivot structure and a straight structure connected to the pivot structure;

[0035] like Figures 1 to 3 As shown, the side seat is provided with a vertically penetrating positioning sliding hole. The cross-sectional shape of the positioning sliding hole is not limited and can be circular, rectangular, elliptical, trapezoidal, or any other arbitrary shape. Preferably, a positioning cylinder 7 is used as the side seat. A lower arm 8 is slidably inserted into the positioning sliding hole as a straight structure. The lower arm 8 is one or more straight rods or a structure such as square steel or steel bar. Figure 1 , Figure 2 The lower arm 8 in the middle is a straight rod. Figure 3 The lower arm is made of square steel or multiple steel bars arranged side by side; the end of the lower arm 8 is provided with a locking component 9 with a size larger than the inner diameter of the positioning sliding hole to prevent the end of the lower arm 8 from coming out of the positioning sliding hole; a set of lower arms 8 are used in conjunction with side seats, and one or more side seats can correspond to one base plate seat 2.

[0036] The base plate 2 is fixedly provided with an upper arm 6 on the side facing the inside of the bridge; the pivot structure includes an upper shaft 4 and a rotating seat 5 rotatably sleeved outside the upper shaft 4. The upper shaft 4 is fixed to the free end of the upper arm 6, and the rotating seat 5 is fixed to the upper end of the lower arm 8; thus, after the base plate 2 is removed from the concrete guardrail 1, the base plate 2 can be raised and flipped up and down by moving the lower arm 8 and rotating the pivot structure; the rotating seat 5 can also move axially relative to the upper shaft 4, but slide off the upper shaft 4. Specifically, this can be achieved by setting the upper arm 6 at both ends of the upper shaft 4 or by setting an auxiliary plug 18 at the end of the upper shaft 4.

[0037] When bridge inspection is required, after the base plate 2 is removed from the upper surface of the concrete guardrail 1, there is still a corner extension mechanism connecting it, so there is no possibility of workers accidentally dropping the anti-throw net, and the safety of vehicles and pedestrians below can always be maintained; when removing or replacing the anti-throw net, it can also be folded inwards into the bridge first, and then removed to prevent the anti-throw net from falling.

[0038] After the base plate 2 is removed, the anti-throw net is erected. The worker rotates the column 3 downward and then lifts the base plate 2, causing the column 3 to invert. Then, the bottom of the column is moved towards the concrete guardrail 1 in an inclined position. At this time, the anti-throw net can only fall in the opposite direction. However, because the top of the column 3 is restricted by the pull of the upper arm 6, it can maintain an almost vertical state and will not tilt. This frees up space for the folding arm of the bridge inspection vehicle, eliminating the need for workers to move the net back and forth, thus saving manpower.

[0039] The locking component 9 is fixed to the lower end of the lower arm 8 by welding or integral molding, or is detachably disposed on the lower end of the lower arm 8; preferably, the locking component 9 is detachably disposed on the lower arm 8, and the locking component 9 is a spring pin, pin, bolt, or nut threadedly connected to the end of the lower arm 8 through the lower arm 8; when installing for the first time or when the column 3 needs to be replaced, the side seat can be installed at a predetermined distance in advance, and then the anti-throw net column 3 and net are installed. When installing the anti-throw net, first remove the locking component 9 from the lower wall, and then install the locking component 9 after the lower arm 8 passes through the positioning sliding hole.

[0040] like Figures 1 to 3 As shown, the side seat is located on the upper part of the concrete guardrail 1, so that the distance between the side seat and the locking component 9 is the variation distance of the lower arm 8. The side seat is pre-embedded in the concrete guardrail 1 by the support 71, or installed on the inner side of the concrete guardrail 1 by the anchor. The structure of the straight part needs to meet the requirement of inverting the post 3. In one embodiment, the height of the concrete guardrail 1 is 1.2m, and the height of the anti-throw net post 3 is 1.5m. In order for the anti-throw net to be inverted and lean against the concrete guardrail 1 after being removed from the concrete, the relative movement between the straight part and the side seat or the base plate seat 2 can provide a variation distance of at least 30cm.

[0041] like Figure 7 As shown, the concrete guardrail 1 is pre-embedded with pre-embedded steel pipes 20. The pre-embedded steel pipes 20 are rectangular or circular steel pipes with a size of 6-8cm and a pre-embedding depth of 30cm-40cm. The pre-embedded steel pipes 20 are connected to the reinforcing bars inside the concrete guardrail 1 by welding or binding. The pre-embedded steel pipes 20 are set vertically, and all pre-embedded steel pipes 20 must be in a straight line and located in the middle of the top surface of the concrete guardrail 1. The top of the pre-embedded steel pipe 20 is connected to a flange base plate. The top of the pre-embedded steel pipe 20 is sleeved with the flange base plate. The pre-embedded steel pipe 20 is inserted into the opening of the flange base plate and is flush with the top surface of the flange base plate. The welding is tight. The flange base plate and four pre-embedded bolt sleeves are pre-embedded in the concrete guardrail 1. The upper surface of the flange base plate is flush with the top surface of the concrete guardrail 1.

[0042] The outer diameter of the column 3 is slightly smaller than the inner diameter of the pre-embedded steel pipe 20. The lower end of the column 3 is inserted into the steel pipe 20. The base plate 2 has holes corresponding to the pre-embedded bolt sleeves. The base plate 2 is bolted to the flange base plate. To ensure the stability of the column 3 during installation, 3 to 4 ∟ angle steels are welded around the connection between the base plate 2 and the column 3 to stabilize the column 3 and enhance its anti-overturning ability. Three fixing connecting ears are inserted and welded onto the column 3. The fixing connecting ears are connected at three points on the upper, middle, and lower parts of the frame. The fixing connecting ears are about 4cm wide and about 0.5cm thick. The steel plate is made of m. At the three connection points, the column 3 has an opening about 4.5cm high and 0.6mm wide in the straight axis direction of the anti-throw net. The fixing connecting ears are passed through the openings through the column 3. The fixing connecting ears on each side of the column 3 extend about 4cm outward. The fixing connecting ears should be installed vertically and parallel to the axis of the anti-throw net. After the position is accurately adjusted, the gap between the column 3 and the steel plate of the fixing connecting ears is welded tightly and firmly. On the steel plate of the fixing connecting ears, there is a bolt hole at the center position 11.5cm away from the column 3. The bolts are used to connect with the bolt holes of the anti-throw net frame. The bolt connection facilitates the replacement of the anti-throw net mesh.

[0043] The anti-throw net frame is made of angle steel, with a galvanized or plastic-coated surface treatment to prevent rust. The frame has pre-drilled mounting holes corresponding to the pre-drilled bolt holes, 1cm from the outer edge of the frame. The frame is connected to the fixing lugs with bolts, ensuring a 0.5cm distance between the post 3 and the anti-throw net frame after connection. The bridge anti-throw net is woven and welded from low-carbon steel wire or aluminum-magnesium alloy wire, or stamped and stretched from steel plates. For bridges crossing operational railway lines, domestic high-grade low-carbon steel wire or aluminum-magnesium alloy wire is preferred, woven and welded with powder coating. The netting is securely connected to the post 3, and the netting surface is flat after installation, without obvious warping or unevenness.

[0044] Example 2

[0045] This embodiment is another implementation based on embodiment 1. The description of the same technical solutions as in embodiment 1 will be omitted, and only the technical solutions that are different from those in embodiment 1 will be described.

[0046] like Figures 4 to 7 As shown, a bridge anti-throw net for crossing an operational railway line includes a base plate 2 detachably mounted on a concrete guardrail 1, columns 3 mounted on the base plate 2, a mesh panel installed between two columns 3, and a side seat mounted on the inner side of the concrete guardrail 1; a corner extension mechanism is provided between the side seat and the base plate 2, and the corner extension mechanism includes a pivot structure and a straight structure connected to the pivot structure;

[0047] A fixing plate 15 is provided on the inner side of the concrete guardrail 1 as a side seat. The fixing plate 15 is provided with fixing holes 16, through which the fixing plate 15 is installed on the inner side of the concrete guardrail 1. The base plate 2 is provided with a sliding arm hole 10, which extends along the thickness direction of the concrete guardrail 1. The pivot structure includes an upper shaft 4 and a rotating seat 5 rotatably sleeved outside the upper shaft 4. One end of the straight part is slidably connected in the sliding arm hole 10, and the other end of the straight part is fixed on the upper shaft 4. The rotating seat 5 is directly fixed on the side seat. Thus, after the base plate 2 is removed from the concrete guardrail 1, the base plate 2 can be raised and flipped up and down by rotating the pivot and sliding the straight part.

[0048] The straight structure includes a sliding shaft 11 that moves within the sliding arm hole 10, anti-detachment components 12 fixed at both ends of the sliding shaft 11, and a movable arm 14 fixed in the middle of the sliding shaft 11. One end of the movable arm 14 is fixed to the upper shaft 4, and the other end of the movable arm 14 is fixed to the upper shaft 4. A top cover 13 is provided on the base plate 2. A notch is provided on the side of the top cover 13 facing the side seat. The notch is located at the end of the sliding arm hole 10. The straight structure can only rotate relative to the sliding arm hole 10 after the sliding shaft 11 moves to the notch position.

[0049] When bridge inspection is required, after the base plate 2 is removed from the upper surface of the concrete guardrail 1, there is still a corner extension mechanism connecting it, so there is no possibility of workers accidentally dropping the anti-throw net, and the safety of vehicles and pedestrians below can always be maintained; when removing or replacing the anti-throw net, it can also be folded inwards into the bridge first, and then removed to prevent the anti-throw net from falling.

[0050] In this embodiment, when the bridge inspection vehicle needs to perform bridge inspection, the base plate 2 is first removed from the concrete guardrail 1. Then, the worker rotates the column 3 downwards until the sliding shaft 11 moves from the end away from the inside of the concrete guardrail 1 to the other end of the sliding arm hole 10. Then, while lifting, the column 3 is rotated until the column 3 is inverted. At this time, the top of the column 3 is restricted by the pull of the upper arm 6 and can maintain an approximately vertical state, which can free up space for the folding arm of the bridge inspection vehicle and save manpower by eliminating the need for workers to move the mesh back and forth.

[0051] Optionally, the fixing plate 15 is composed of two horizontally symmetrical sub-plates; the number of the rotating seats 5 is two and they are located at both ends of the upper shaft 4 respectively, and each sub-plate is provided with one rotating seat 5, so that when the column 3 needs to be replaced, only one sub-plate needs to be removed to remove the base plate seat 2, the pivot structure and the straight structure together.

[0052] Optionally, the sliding arm hole 10 is open on the side near the concrete guardrail 1. The base plate 2 is detachably provided with a sealing component that can seal the open end of the sliding arm hole 10. The sealing component includes a plug 18 attached to the outer edge of the sliding arm hole 10, a support plate 17 fixed to the bottom of the plug 18, and a connecting piece 19 connecting the two plugs 18. The plug 18 is provided with a slide end corresponding to the sliding arm hole 10. The size of the slide end is not smaller than the sliding arm hole 10, so that the sliding shaft 11 can slide smoothly from the sliding arm hole 10 into the slide end. The closed end of the slide end corresponds to the notch of the top cover 13. The support plate 17 is provided with a corresponding sealing hole for bolting the sealing component onto the base plate 2. The sealing component facilitates the disassembly and assembly of the corner extension mechanism. After removing the sealing component, the sliding shaft 11 can slide out of the sliding arm hole 10, realizing the complete separation of the base plate 2 from the concrete guardrail 1.

[0053] It is understood that the above description is merely exemplary and the embodiments of this application are not intended to limit the scope of the invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A bridge anti-throw net spanning an operational railway line, comprising a base plate seat (2) detachably mounted on the upper surface of a concrete guardrail (1), posts (3) mounted on the base plate seat (2), and a mesh panel installed between two posts (3), characterized in that: It also includes a side seat set inside the concrete guardrail (1), and a corner extension mechanism is provided between the side seat and the base plate seat (2). The corner extension mechanism includes a pivot structure and a straight structure connected to the pivot structure. The straight structure is slidably connected to the side seat. The side seat is set on the upper part of the concrete guardrail (1). The side seat is provided with a vertically penetrating positioning slide hole. A lower arm (8) is slidably inserted through the positioning slide hole as a straight structure. The end of the lower arm (8) is provided with a locking component (9) with a size larger than the inner diameter of the positioning slide hole. The locking component (9) is detachably mounted on the lower arm (8). The locking component (9) is a spring pin, pin, bolt, or nut threadedly connected to the end of the lower arm (8) and inserted through the lower arm (8). The base plate seat (2) is fixedly provided with an upper arm (6) on the side facing the inside of the bridge; the pivot structure includes an upper shaft (4) and a rotating seat (5) rotatably sleeved outside the upper shaft (4). The upper shaft (4) is fixed to the free end of the upper arm (6), and the rotating seat (5) is fixed to the upper end of the lower arm (8). Thus, after the base plate seat (2) is removed from the concrete guardrail (1), the base plate seat (2) can be raised and flipped up and down by moving the lower arm (8) and rotating the pivot structure.

2. The anti-throw net for bridges crossing operational railway lines according to claim 1, characterized in that: Alternatively, the straight structure is slidably connected to the base plate seat, and the base plate seat (2) is provided with a sliding arm hole (10), which extends along the thickness direction of the concrete guardrail (1); the pivot structure includes an upper shaft (4) and a rotating seat (5) rotatably sleeved outside the upper shaft (4), one end of the straight structure is slidably connected in the sliding arm hole (10), the other end of the straight structure is fixed on the upper shaft (4), and the rotating seat (5) is directly fixed on the side seat, so that after the base plate seat (2) is removed from the concrete guardrail (1), the base plate seat (2) can be raised and flipped up and down by rotating the pivot and sliding the straight structure.

3. The anti-throw net for bridges crossing operational railway lines according to claim 2, characterized in that: The inner side of the concrete guardrail (1) is provided with a fixing plate (15) as a side seat. The fixing plate (15) is composed of two horizontally symmetrical sub-plates. There are two rotating seats (5) located at both ends of the upper shaft (4), and one rotating seat (5) is provided on each sub-plate.

4. The anti-throw net for bridges crossing operational railway lines according to claim 2, characterized in that: The sliding arm hole (10) is open on the side near the concrete guardrail (1), and a sealing component that can seal the open end of the sliding arm hole (10) is detachably provided on the base plate (2).

5. The anti-throw net for bridges crossing operational railway lines according to claim 2, characterized in that: The straight structure includes a sliding shaft (11) that moves within the sliding arm hole (10), anti-detachment components (12) fixed at both ends of the sliding shaft (11), and a movable arm (14) fixed in the middle of the sliding shaft (11). One end of the movable arm (14) is fixed on the upper shaft (4), and the other end of the movable arm (14) is fixed on the upper shaft (4).

6. The anti-throw net for bridges crossing operational railway lines according to claim 5, characterized in that: The base plate (2) is provided with a top cover (13), and the top cover (13) has a notch on the side facing the side seat. The notch is located at the end of the sliding arm hole (10). Only after the sliding shaft (11) moves to the notch position can the straight structure rotate relative to the sliding arm hole (10).

7. The anti-throw net for bridges crossing operational railway lines according to claim 1, characterized in that: The concrete guardrail (1) is pre-embedded with a steel pipe (20) at a depth of 30cm to 40cm; the steel pipe (20) is set vertically and the top of the steel pipe (20) is connected to a flange base plate; the lower end of the column (3) is inserted into the steel pipe (20) and the base plate seat (2) is bolted to the flange base plate; several fixed connecting ears are threaded through and welded on the column (3) and the fixed connecting ears are bolted to the frame of the mesh; after connection, the distance between the column (3) and the mesh frame is 0.5cm; the mesh is made of low carbon steel wire or aluminum-magnesium alloy wire through spray coating and welding.

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