Safety protection net device for tunnel inverted arch trestle

Abstract

The utility model discloses a safety protection net device for a tunnel inverted arch trestle. The safety protection net device comprises a winding device, a protection net and a driving unfolding device. The winding device is mounted between the two adjacent trestle platforms; one end of the protective net is connected with a reel of the winding device; the driving unfolding device comprises a guide rail, a first clamping plate, a second clamping plate and an electromagnetic sliding block. The first clamping plate and the second clamping plate are mounted on two sides of the guide rail; the electromagnetic sliding block is installed on the guide rail and comprises an electromagnet and an electrode elastic piece, the electromagnet corresponds to the permanent magnet in position, the electrode elastic piece is in sliding contact with the corresponding fixed electrode piece, and the electrode elastic piece is electrically connected with the electromagnet; the other end of the protective net is connected with the electromagnetic sliding block. According to the device, the middle gap area between the trestles is covered with the expandable flexible protective net, so that people are effectively prevented from stepping on the gap by mistake or slipping and falling, and the personal injury risk in the tunnel inverted arch construction process is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of protective facilities for trestle bridge construction, and in particular relates to a safety protection net device for tunnel arch trestle bridges. Background Technology

[0002] During tunnel construction, the invert arch, as a crucial component bearing the bottom load, plays a decisive role in the overall stability and structural safety of the tunnel. Invert arch construction often involves multiple processes and personnel working simultaneously, including rebar tying, concrete pouring, and waterstop installation. Therefore, the construction site environment is complex, the work density is high, and the construction space is limited, resulting in significant safety risks. To improve the efficiency of invert arch operations and facilitate the passage of personnel and equipment, construction teams typically erect temporary trestle structures in the tunnel invert arch area, giving them multiple functions such as transportation, support, and a construction platform.

[0003] Existing tunnel invert arch trestle structures typically consist of two main bridges erected on either side of the tunnel floor, leaving a central gap for construction work or equipment passage within the invert arch area. However, this structural arrangement lacks effective safety protection facilities in the central area, making it highly susceptible to slips and falls, especially when personnel are crossing between the main bridges or working in the central area. Furthermore, factors such as insufficient lighting, slippery surfaces, and construction noise within the tunnel exacerbate the risk of workers accidentally stepping into the gap or falling, seriously threatening construction safety.

[0004] To address this issue, some engineering practices have attempted to install temporary guardrails or cover scaffold boards, but these methods have several limitations. Firstly, traditional guardrail structures are mostly fixed installations, lacking telescopic or quick-assembly / disassembly capabilities, affecting the flexibility and efficiency of invert arch construction operations. Secondly, covering scaffold boards suffer from insufficient load-bearing capacity, insecure fixation, and susceptibility to being moved or misappropriated, failing to provide stable and lasting safety. Furthermore, during tunnel construction requiring frequent movement of equipment or material transport, fixed protective facilities often become obstacles, disrupting the construction schedule. Utility Model Content

[0005] The purpose of this invention is to provide a safety net device for tunnel arch bridges.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A safety protection net device for tunnel arch trestle bridges includes: a winding device, a protective net, and a driving deployment device; the winding device is installed between two adjacent trestle bridge platforms; the protective net is a flexible protective net, and one end of the protective net is connected to the winding device's roller; the driving deployment device includes a guide rail, a first clamping plate, a second clamping plate, and an electromagnetic slider; the first clamping plate and the second clamping plate are installed on both sides of the guide rail; the first clamping plate and the second clamping plate are provided with spaced permanent magnets, and the magnetic poles of two adjacent permanent magnets are arranged in opposite directions; the first clamping plate and the second clamping plate are also provided with paired fixed electrode plates, and the polarities of adjacent fixed electrode plates on the same clamping plate are alternately arranged; the electromagnetic slider is installed on the guide rail, and the electromagnetic slider includes an electromagnet and an electrode spring, the electromagnet is positioned corresponding to the permanent magnet, the electrode spring and the corresponding fixed electrode plate are in sliding contact, and the electrode spring is electrically connected to the electromagnet; the other end of the protective net is connected to the electromagnetic slider.

[0007] The safety net device for tunnel arch bridges described above further includes a winding device comprising a reel drive that drives the reel to rotate and retract the safety net; the guide rail is fixedly connected to the bridge platform.

[0008] The safety net device for tunnel arch bridges described above further includes, in part, a first clamping plate and a second clamping plate, both comprising a base plate, a permanent magnet and a fixed electrode plate. On a base plate, the fixed electrode plate is disposed between two adjacent permanent magnets and is located below the permanent magnets.

[0009] The safety net device for tunnel arch bridges described above further includes bolt holes on the base plate, through which the first clamping plate and the second clamping plate are connected to the guide rail by bolts.

[0010] The safety protection net device for tunnel arch bridges described above further includes an electromagnetic slider comprising a base and a guide block fixed to the lower part of the base, wherein the structure of the guide block is adapted to the guide groove structure of the guide rail.

[0011] The safety net device for tunnel arch bridges described above further includes two electrode mounting plates on the electromagnetic slider, with the electrode springs mounted on the electrode mounting plates.

[0012] The safety net device for tunnel arch bridges described above further includes a power supply and a control switch. The power supply is electrically connected to the fixed electrode plate, and the control switch is located on the wire connecting the power supply and the fixed electrode plate.

[0013] The safety net device for tunnel arch bridges described above further includes a safety net support rod, which is fixedly connected to the bridge platform. Loops are connected to both sides of the safety net, and the loops are fitted onto the safety net support rod.

[0014] The beneficial effects of this utility model are:

[0015] 1. Significantly improves personnel safety: The device covers the central gap between the trestle bridges with an expandable flexible protective net, effectively preventing personnel from accidentally stepping into the gap or falling, and reducing the risk of personal injury during the construction of the tunnel invert arch.

[0016] 2. Achieve retractability of the protective structure to adapt to complex working conditions; through the cooperation of the winding device and the drive unfolding device, the protective net can be flexibly unfolded and retracted according to construction needs without affecting construction operations such as steel bar binding and concrete pouring, thus solving the problem of the traditional protective structure affecting the flexibility of operation.

[0017] 3. The support rod structure of the protective net enhances the stability of the net; by using the collar in conjunction with the support rod structure, the protective net can be further prevented from swinging or falling under stress, thus improving the overall protective performance.

[0018] 4. Suitable for the construction characteristics of segmented tunnel construction and segmented protection, improving the utilization rate of protective facilities; the flexible and easy-to-install structural design allows the device to be reused multiple times, improving the economic benefits of construction equipment. Attached Figure Description

[0019] The advantages of the present invention, as described above and / or in the following detailed description in conjunction with the accompanying drawings, will become clearer and more readily understood. These drawings are merely illustrative and do not limit the scope of the present invention.

[0020] Figure 1 This is a schematic diagram of a safety net device for a tunnel arch bridge according to one embodiment.

[0021] Figure 2 This is a schematic diagram of a protective net support rod according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a drive deployment device according to an embodiment of the present invention;

[0023] Figure 4This is a partial schematic diagram of a drive deployment device according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of an electromagnetic slider according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a permanent magnet and electrodes according to an embodiment of the present invention.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 10. Trestle platform; 20. Power supply; 30. Protective net; 40. Winding device; 50. Guide rail; 60. Electromagnetic slider; 61. Base; 62. Guide block; 63. Electrode mounting plate; 64. Electrode spring; 65. Electromagnet; 70. First clamping plate; 80. Second clamping plate; 81. Base plate; 82. Permanent magnet; 83. Fixed electrode plate; 84. Bolt hole; 90. Protective net support rod; 91. Collar. Detailed Implementation

[0028] In the following description, embodiments of the safety net device for tunnel arch bridges according to the present invention will be described with reference to the accompanying drawings.

[0029] The embodiments described herein are specific implementations of this utility model, used to illustrate the concept of this utility model. They are all illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0030] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of this utility model, and schematically show the shapes of the various parts and their interrelationships. Please note that, in order to clearly show the structure of the components of the embodiments of this utility model, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0031] Combination Figures 1 to 6 This invention describes a safety net device for a tunnel arch trestle bridge according to an embodiment of the present invention, comprising:

[0032] A winding device 40 is installed between two adjacent trestle platforms 10. In a preferred embodiment, the winding device 40 includes a spool drive device that drives the spool to rotate and retract the protective netting 30. A guide rail 50 is fixedly connected to the trestle platform 10. The spool drive device can be a manual crank type, where the orderly unfolding and winding of the protective netting 30 is achieved by adjusting the rotation direction. The spool drive device can also be a geared motor and a gear transmission assembly, where the output shaft of the geared motor meshes with a large gear at the end of the spool via a small gear, preferably with a transmission ratio of 1:15 to 1:20.

[0033] The protective net 30 is a flexible protective net, with one end connected to the reel of the winding device 40. In a preferred embodiment, the protective net 30 adopts a double-layer composite structure, including a base layer. The base layer is made of plain-weave nylon 66 fiber with a single filament diameter of 0.8mm, a warp density of 12 strands / cm, and a weft density of 10 strands / cm, forming a standard mesh size of 20mm×20mm±1mm. Reinforcing ribs are spaced 500mm apart along the length of the protective net 30, and are made of 3mm thick polyurethane strips heat-fused to the surface of the base layer to effectively improve tear resistance. The mesh size of the protective net 30 can be customized according to on-site construction needs, typically with a mesh side length of 20mm to 50mm, to effectively prevent personnel, tools, or materials from accidentally falling without hindering construction operations. The edges of the protective net 30 are equipped with reinforcing ropes, which are made of multiple strands of high-strength wire twisted together to enhance its overall stress performance and tear resistance.

[0034] The drive deployment device includes a guide rail 50, a first clamping plate 70, a second clamping plate 80, and an electromagnetic slider 60.

[0035] The first clamping plate 70 and the second clamping plate 80 are mounted on both sides of the guide rail 50; the first clamping plate 70 and the second clamping plate 80 are provided with spaced permanent magnets 82, and the magnetic poles of two adjacent permanent magnets 82 are arranged in opposite directions. The first clamping plate 70 and the second clamping plate 80 are also provided with paired fixed electrode plates 83, and the polarities of adjacent fixed electrode plates 83 on the same clamping plate are arranged alternately. Figure 6 In one specific embodiment, a partial structure of the clamping plate is shown. The magnetic poles of adjacent permanent magnets 82 are arranged in opposite directions. Specifically, the magnetic poles inside the first clamping plate magnet are arranged from left to right as NSNS, and the corresponding arrangement of the second magnetic poles is SNSN. Figure 6In one specific embodiment shown, both the first clamping plate 70 and the second clamping plate 80 include a base plate 81, permanent magnets 82, and fixed electrode plates 83. The fixed electrode plates 83 are disposed on a base plate 81 between two adjacent permanent magnets 82, with the fixed electrode plates 83 located below the permanent magnets 82. Preferably, the permanent magnets 82 are made of neodymium iron boron material. The polarities of the four fixed electrode plates alternate, for example, from left to right: negative-positive-negative-positive. This arrangement causes the permanent magnets closer to the electromagnet to generate a forward repulsive force, while the permanent magnets farther from the electromagnet to generate a forward attractive force. When the electromagnetic slider 60 moves one permanent magnet spacing, the polarity of the electromagnet 65 switches once to maintain the forward driving force. The winding direction of the electromagnet coil is determined by those skilled in the art based on the magnetic pole arrangement of the permanent magnets, the polarities of the fixed electrode plates, and Lenz's law. In a preferred embodiment, as... Figure 6 As shown, the base plate 81 is also provided with bolt holes 84, through which the first clamping plate 70 and the second clamping plate 80 are connected to the guide rail 50 by bolts. The bolt holes 84 are circular through holes with an inner diameter of Φ6~Φ10mm, which are suitable for M6 or M8 bolts, facilitating quick disassembly and replacement in complex construction sites.

[0036] An electromagnetic slider 60 is mounted on a guide rail 50. The electromagnetic slider 60 includes an electromagnet 65 and an electrode spring 64. The electromagnet 65 is positioned corresponding to the permanent magnet 82. The electrode spring 64 and its corresponding fixed electrode 83 are in sliding contact. The electrode spring 64 is electrically connected to the electromagnet 65. In a preferred embodiment, as shown... Figure 5 As shown, the electromagnetic slider 60 includes a base 61 and a guide block 62 fixed to the lower part of the base 61. The structure of the guide block 62 is adapted to the guide groove structure of the guide rail 50. The material of the guide block 62 can be a low-friction coefficient material such as polytetrafluoroethylene or nylon 66 to reduce sliding resistance and improve guiding accuracy. The other end of the protective net 30 is connected to the electromagnetic slider 60. In another embodiment, as... Figure 5 As shown, the electromagnetic slider 60 also includes two electrode mounting plates 63, and electrode springs 64 are mounted on the electrode mounting plates 63. The electrode springs 64 are made of elastic phosphor bronze and are connected to the electromagnet 65 wires by welding to ensure reliable power supply and sliding life.

[0037] During use, when construction work is required in the invert arch area, construction personnel can operate the control switch to power on the electromagnetic slider 60, causing it to move on the guide rail 50 and pull the protective net 30 to unfold until it covers the work gap between the two trestle platforms 10. Specifically, the electromagnetic slider 60 generates driving force through the interaction of the magnetic poles of the electromagnet 65 and the permanent magnet 82. At the same time, the electrode spring 64 slides on the fixed electrode plates 83 of different polarities, realizing the automatic switching of the current direction of the electromagnet 65, thereby forming a continuous driving force. After the work is completed, the protective net 30 is retracted into the reel by the reverse drive winding device 40, realizing the reset and reuse of the device.

[0038] In a specific embodiment of a safety net device for a tunnel arch bridge, such as Figure 1 As shown, it also includes a power supply 20 and a control switch. The power supply 20 is electrically connected to the fixed electrode plate 83, and the control switch is located on the wire connecting the power supply 20 and the fixed electrode plate 83. The control switch is a toggle switch or a push-button switch with two working modes: on and off. To adapt to the requirements of the tunnel environment, a waterproof and dustproof switch can be selected and located on the side of the trestle platform 10 for easy operation.

[0039] To ensure the deployed safety net remains taut and prevents it from sagging between two adjacent trestle platforms, the aforementioned safety net device for tunnel arch trestle bridges has been further improved, such as... Figure 2 As shown, it also includes protective netting support rods 90, which are fixedly connected to the trestle platform 10. Loops 91 are connected to both sides of the protective netting 30, and the loops 91 are fitted onto the protective netting support rods 90. The protective netting support rods 90 are made of stainless steel or aluminum alloy, possessing excellent corrosion resistance and suitable for high-humidity environments such as tunnels. The loops 91 are detachable, facilitating quick assembly and disassembly of the protective netting 30 during maintenance or winding.

[0040] The technical features disclosed above are not limited to the combinations of the disclosed features with other features. Those skilled in the art can also make other combinations of the technical features according to the purpose of the utility model in order to achieve the purpose of the utility model.

Claims

1. A safety net device for tunnel arch trestle bridges, characterized in that, include: The winding device (40), the protective net (30), and the drive unfolding device; The winding device (40) is installed between two adjacent trestle platforms (10); the protective net (30) is a flexible protective net (30), one end of which is connected to the reel of the winding device (40); the drive unfolding device includes a guide rail (50), a first clamping plate (70), a second clamping plate (80), and an electromagnetic slider (60); the first clamping plate (70) and the second clamping plate (80) are installed on both sides of the guide rail (50); the first clamping plate (70) and the second clamping plate (80) are provided with spaced permanent magnets (82), and the magnetic poles of two adjacent permanent magnets (82) are arranged in opposite directions. The first clamping plate (70) and the second clamping plate (80) are also provided with paired fixed electrode plates (83), and the adjacent fixed electrode plates (83) on the same clamping plate are arranged with alternating polarities; the electromagnetic slider (60) is installed on the guide rail (50), and the electromagnetic slider (60) includes an electromagnet (65) and an electrode spring (64). The electromagnet (65) is positioned corresponding to the permanent magnet (82), and the electrode spring (64) and the corresponding fixed electrode plate (83) are in sliding contact. The electrode spring (64) is electrically connected to the electromagnet (65); the other end of the protective net (30) is connected to the electromagnetic slider (60).

2. The safety protection net device for tunnel arch trestle bridges according to claim 1, characterized in that, The winding device (40) includes a spool drive device, which drives the spool to rotate and retract the protective net (30); the guide rail (50) is fixedly connected to the trestle platform (10).

3. The safety protection net device for tunnel arch trestle bridges according to claim 1, characterized in that, The first clamping plate (70) and the second clamping plate (80) both include a substrate (81), a permanent magnet (82) and a fixed electrode plate (83). On a substrate (81), the fixed electrode plate (83) is disposed between two adjacent permanent magnets (82) and is located below the permanent magnets (82).

4. The safety net device for tunnel arch trestle bridges according to claim 3, characterized in that, The substrate (81) is also provided with bolt holes (84), and the first clamping plate (70) and the second clamping plate (80) are connected to the guide rail (50) by bolts.

5. The safety net device for tunnel arch trestle bridges according to claim 4, characterized in that, The electromagnetic slider (60) includes a base (61) and a guide block (62) fixed to the lower part of the base (61). The structure of the guide block (62) is adapted to the guide groove structure of the guide rail (50).

6. The safety protection net device for tunnel arch trestle bridges according to claim 5, characterized in that, The electromagnetic slider (60) also includes two electrode mounting plates (63), and the electrode springs (64) are mounted on the electrode mounting plates (63).

7. The safety protection net device for tunnel arch trestle bridges according to claim 6, characterized in that, It also includes a power supply (20) and a control switch, wherein the power supply (20) is electrically connected to the fixed electrode plate (83), and the control switch is disposed on the wire connecting the power supply (20) and the fixed electrode plate (83).

8. The safety net device for tunnel arch trestle bridges according to any one of claims 1 to 7, characterized in that, It also includes a protective net support rod (90), which is fixedly connected to the trestle platform (10). The protective net (30) has collars (91) connected to both sides, and the collars (91) are sleeved on the protective net support rod (90).

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