Tunnel fly rock protection device

Abstract

The utility model belongs to the construction safety protection technical field, concretely relates to a tunnel fly rock protection device. Its including support assembly, drive assembly who sets up on support assembly and the protection assembly who is connected with drive assembly through transmission assembly for blocking fly rock, the protection assembly includes the support rod fixed with transmission assembly, and the protection curtain who overlaps on the support rod. The utility model discloses through the cooperation of drive assembly and transmission assembly realizes the quick steady lifting of protection curtain, satisfies the situation that needs to go in and out the tunnel frequently in the blasting construction process. The utility model discloses through the design of double -deck protection curtain, can play good protection effect and can reduce the situation that protection curtain is broken. The utility model discloses simple structure, and the installation dismantles fast, and the material used is all common in construction, can play good protection effect, greatly improves construction efficiency, is suitable for promoting in practice.

Description

Technical Field

[0001] This utility model belongs to the field of construction safety protection technology, specifically relating to a tunnel rockfall protection device. Background Technology

[0002] Tunnel engineering, as an important form of underground space development, plays an irreplaceable role in the construction of infrastructure such as railways, highways, water conservancy, and municipal works. Blasting, due to its high efficiency and low cost, remains the mainstream construction technique for hard rock tunnel excavation. However, during blasting operations, flyrock is inevitably generated due to various factors such as geological conditions, charge parameters, and detonation sequence.

[0003] Traditional blasting flyrock control technologies are mainly divided into two categories: passive protection and active protection. Passive protection most commonly involves building sandbag walls in front of the tunnel entrance, using the sandbags' buffering effect to absorb the kinetic energy of the flyrock. While this method is inexpensive, it suffers from significant drawbacks such as long construction periods and wasted manpower and resources. Active protection, such as the tunnel blasting flyrock shielding device disclosed in patent CN 216011988 U, uses multiple sets of mounting hooks and steel beams to install a series of downward-hanging flexible rubber mesh panels, which prevent flyrock from being ejected. However, the installation of the rubber mesh panels in this technology relies on fixing components installed at the tunnel ceiling, making the installation and disassembly of the protective device difficult. When multiple blasting operations are required, or when large equipment needs to enter and exit the tunnel, this technology is limited by its fixing method, making it difficult to quickly open and close tunnel passages, and thus cannot meet diverse construction needs. Utility Model Content

[0004] The present invention aims to overcome the shortcomings of existing tunnel rockfall protection devices, such as poor protection effect, fixed protection method, and inability to meet the needs of construction scenarios requiring frequent tunnel entry and exit, such as multiple blasting operations. The present invention provides a tunnel rockfall protection device to overcome the above-mentioned shortcomings.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A tunnel rockfall protection device includes a support assembly, a drive assembly mounted on the support assembly, and a protective assembly for blocking rockfalls connected to the drive assembly via a transmission assembly.

[0007] The protective assembly includes a support rod fixed to the transmission assembly, and a protective curtain draped over the support rod.

[0008] During tunnel blasting, the explosives used not only break up the target mountain but also release excess gas energy. When this energy acts on the debris, it imparts significant kinetic energy to the rock fragments, causing them to fly out of the tunnel entrance and pose a serious safety hazard to construction workers and equipment. Traditional methods of protecting against flying debris in tunnels involve installing rigid protective devices, such as steel plates, at the tunnel entrance, but this method is time-consuming and labor-intensive. Alternatively, flexible protective devices, such as rubber sheets, can be suspended at the tunnel entrance, but these methods offer limited protection, as high-speed flying debris can potentially puncture them. Furthermore, both rigid and flexible protective devices have the limitation of restricting the flexible opening of the tunnel entrance.

[0009] Therefore, based on the soft protective device, this invention first provides stable support for the entire protective device through a bracket assembly, while also providing space for the protective curtain to rise. Secondly, a drive assembly and a transmission assembly are installed on the bracket assembly as the power source for the protective curtain to rise. Finally, a support rod is fixed to the end of the transmission assembly, and a soft protective curtain is then attached to the support rod, forming two layers of protection when the curtain hangs naturally. Depending on the diameter of the support rod, there is a certain space between the two layers of protective curtain. When a flying stone collides with the first layer of protective curtain, it will cause the curtain to move backward, absorbing as much of the flying stone's kinetic energy as possible. When the first and second layers of protective curtain collide, they provide a large reaction force to the flying stone, preventing it from continuing to fly. This invention, through the double-layered protective curtain design, achieves good protection while reducing the likelihood of the curtain being broken. Simultaneously, with the support rod, the protective curtain can also move flexibly up and down.

[0010] Preferably, the transmission assembly includes a fixed pulley fixed to the support assembly, and a wire rope lapped on the fixed pulley for connecting the drive assembly and the support rod. In practice, the drive assembly is preferably a winch, and the fixed pulley is positioned as high as possible above the winch.

[0011] As a further preferred embodiment, the bracket assembly is provided with a mounting plate for mounting the fixed pulley.

[0012] Preferably, the support assembly is provided with reinforcing ribs. Since the protective device needs to withstand the impact of flying stones, reinforcing ribs can be diagonally arranged between the frames of the support assembly to prevent deformation of the support assembly.

[0013] Preferably, the bracket assembly is provided with a limiting post to prevent the support rod from rising.

[0014] Preferably, the support assembly is equipped with a guy wire that is fixed to the mountain above the tunnel. Because tunnels need to meet various passage requirements, they are typically wide, resulting in a large area for the protective curtain of this invention, thus leading to a large overall weight. Therefore, the guy wire can be fixed to the support assembly to provide a counterforce to the support, compensating for the imbalance caused by the protective curtain.

[0015] Preferably, a counterweight is provided on the side of the support assembly opposite to the protective assembly.

[0016] Preferably, the support assembly is provided with an auxiliary support that is fixed to the tunnel entrance.

[0017] Preferably, the protective curtain is composed of two or more protective belts spliced ​​together. In practice, splicing multiple belts can reduce costs and facilitate the replacement and repair of partially damaged protective curtains.

[0018] As a further preferred embodiment, the protective assembly includes a connecting rod for connecting the protective belt. The connecting rod improves the overall integrity of the protective curtain, preventing flying stones from exiting between the belts.

[0019] Therefore, this utility model has the following beneficial effects:

[0020] (1) This utility model achieves rapid and stable lifting and lowering of the protective curtain through the cooperation of the drive component and the transmission component, which is convenient for situations where frequent entry and exit from the tunnel is required during blasting construction.

[0021] (2) This utility model, through the design of a double-layer protective curtain, can achieve a better protective effect and reduce the chance of the protective curtain being broken.

[0022] (3) This utility model has a simple structure, quick installation and dismantling, and all the materials used are common in construction, which can play a good protective role and greatly improve construction efficiency. It is suitable for promotion in practice. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a tunnel rockfall protection device according to Embodiment 1 of this utility model.

[0024] Figure 2 This is a schematic diagram of the working process of a tunnel rockfall protection device according to Embodiment 1 of this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of a tunnel rockfall protection device according to Embodiment 2 of this utility model.

[0026] In the figure: bracket assembly 10; mounting plate 11; reinforcing rib 12; limiting post 13; pull wire 14; counterweight block 15; auxiliary bracket 16; drive assembly 20; transmission assembly 30; fixed pulley 31; wire rope 32; protective assembly 40; support rod 41; protective curtain 42; connecting rod 43. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figure 1 , 2 As shown, this embodiment of a tunnel rockfall protection device uses a support assembly 10 as its main body. The support assembly 10 is a frame constructed by welding H-beams, with two mounting platforms on top of the frame. The support assembly 10 is positioned at the tunnel entrance, ensuring that the mounting platforms are higher than the top of the tunnel entrance. An A-shaped auxiliary support 16 is installed on the lower mounting platform to fix it to the tunnel top. Two mounting plates 11 are installed on the upper platform. A drive assembly 20 is installed on the lower mounting platform; in this embodiment, the drive assembly 20 consists of two winches. Two upward-facing fixed pulleys 31 are installed on the two mounting plates of the upper platform. One end of a wire rope 32 is connected to the drive shaft of the drive assembly 20, and the other end is connected to the support rod 41 of the protection assembly 40. The wire rope 32 passes over the top of the support assembly 10 and is embedded in the fixed pulleys 31, allowing the drive assembly 20 to drive the support rod 41 up and down by pulling the wire rope 32. Simultaneously, a counterweight 15 is provided on the side of the support assembly 10 away from the protection assembly 40 to balance the center of gravity.

[0030] The protective curtain 42 consists of 10 protective belts, which are overlapped on the support rod 41 and fixed by steel wire wrapping. Figure 1 As shown, when the drive assembly retracts the steel wire rope 32, the support rod 41 and the protective curtain 42 rise together, opening the tunnel entrance for easy access for personnel and equipment. Figure 2 As shown, when the drive assembly 20 releases the wire rope 32, the support rod 41 and the protective curtain 42 descend together. The protective curtain 42 covers the tunnel entrance, making the tunnel entrance closed and preventing flying rocks from the blast.

[0031] Example 2:

[0032] like Figure 3 The image shows an embodiment of the tunnel rockfall protection device of this utility model installed in a mountain tunnel. This embodiment of the tunnel rockfall protection device uses a support assembly 10 as its main body. The support assembly 10 is a frame constructed by welding H-beams, with two mounting platforms on top of the frame. The support assembly 10 is positioned at the tunnel entrance, making the mounting platforms higher than the top of the tunnel entrance. Two mounting plates 11 are installed on the upper platform. A drive assembly 20 is installed on the lower platform. In this embodiment, the drive assembly 20 consists of two winches. Two upward-facing fixed pulleys 31 are installed on the two mounting plates of the upper platform. One end of a wire rope 32 is connected to the drive shaft of the drive assembly 20, and the other end is connected to the support rod 41 of the protection assembly 40. The wire rope 32 passes over the top of the support assembly 10 and is embedded in the fixed pulleys 31, allowing the drive assembly 20 to drive the support rod 41 to move up and down by pulling the wire rope 32. The protective curtain 42 consists of 10 protective leather straps, which are attached together to the support rod 41. Connecting rods 43 are installed on the outer side of the curtain, all secured with wire to improve the overall integrity of the curtain 42. Simultaneously, two diagonally arranged reinforcing ribs 12 are provided on the side of the support assembly 10. At the top of the support assembly 10, a pull wire 14 is fixed at one end to the mountain and the other end to the support assembly 10. This prevents the device from tilting due to the excessive weight of the protective curtain 42 and also improves the impact resistance of the protective device, resulting in good protection against strong blasting impacts and flying rock impacts.

[0033] The embodiments of this specification have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A tunnel rockfall protection device, characterized in that: It includes a support assembly (10), a drive assembly (20) disposed on the support assembly (10), and a protective assembly (40) for blocking flying stones connected to the drive assembly (20) via a transmission assembly (30). The protective assembly (40) includes a support rod (41) fixed to the transmission assembly (30) and a protective curtain (42) attached to the support rod (41).

2. The tunnel rockfall protection device according to claim 1, characterized in that: The transmission assembly (30) includes a fixed pulley (31) fixed on the bracket assembly (10) and a wire rope (32) attached to the fixed pulley (31) for connecting the drive assembly (20) and the support rod (41).

3. A tunnel rockfall protection device according to claim 2, characterized in that: The bracket assembly (10) is provided with a mounting plate (11) for mounting the fixed pulley (31).

4. A tunnel rockfall protection device according to claim 1, characterized in that: The support assembly (10) is provided with reinforcing ribs (12).

5. A tunnel rockfall protection device according to claim 1, characterized in that: The bracket assembly (10) is provided with a limiting post (13) for preventing the support rod (41) from rising.

6. A tunnel rockfall protection device according to claim 1, characterized in that: The support assembly (10) is provided with a guy wire (14) that is fixed to the mountain above the tunnel.

7. A tunnel rockfall protection device according to claim 6, characterized in that: A counterweight (15) is provided on the side of the support assembly (10) opposite to the protective assembly (40).

8. A tunnel rockfall protection device according to claim 1, characterized in that: The support assembly (10) is provided with an auxiliary support (16) that is fixed to the tunnel entrance.

9. A tunnel rockfall protection device according to claim 1, characterized in that: The protective curtain (42) is made up of two or more protective belts spliced ​​together.

10. A tunnel rockfall protection device according to claim 9, characterized in that: The protective assembly (40) includes a connecting rod (43) for connecting the protective belt.

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