A fixing device for a tunnel ventilation duct and its usage method

Abstract

The present invention relates to the technical field of ventilation pipe fixing structures, and specifically relates to a tunnel ventilation pipe fixing device and its usage method, including a ventilation pipe, an upper arc hoop and a lower arc hoop. The upper arc hoop and the lower arc hoop are arranged opposite to each other up and down. Among them, an installation bottom plate is fixedly provided at the bottom of the lower arc hoop. Inner support arcs are elastically and spacedly arranged on the inner sides of the lower arc hoop and the upper arc hoop. A locking structure is used to adjust the upper arc hoop and the lower arc hoop that can relatively displace, so that the deformation tightening plates installed at the arc openings of the two inner support arcs deform towards the inner sides of the inner support arcs. Since the deformation tightening plates are made of elastic rubber material and have a certain elastic restoring force and durability, the upper and lower deformation tightening plates can elastically tighten the ventilation pipe after deformation. Compared with the existing fixed connection technology, it has stronger buffering and adaptability, and has a good seismic resistance and is not easy to cause wear to the ventilation pipe and related accessories, thus improving the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation pipe fixing structures, and specifically relates to a fixing device for tunnel ventilation pipes and a using method thereof. Background Art

[0002] In the field of tunnel engineering, the ventilation system is crucial, and the fixing of ventilation pipes is a key link. The traditional fixing methods for tunnel ventilation pipes are relatively single, mainly using simple hoop or ventilation pipe fixing brackets. The common hoop fixes the ventilation pipe by surrounding the ventilation pipe and connecting it to the support structure. The ventilation pipe fixing bracket places the ventilation pipe on a specific frame structure for positioning. Most of these existing fixing devices use rigid fixing structures to lock the ventilation pipe. The rigid structure means a lack of buffering and the ability to adapt to deformation at the connection points; the internal environment of the tunnel is complex, and vibration often occurs, such as ground vibration caused by vehicle driving, minor deformation of the tunnel structure itself under external pressure (such as formation pressure, etc.), and vibration generated by earthquakes. This vibration will cause the ventilation pipe to shift. Due to the lack of elastic effect in the existing rigid fixing structure, relative displacement will occur between the ventilation pipe and the fixing device, resulting in wear of the ventilation pipe and fittings; long-term wear will reduce the service life of the ventilation pipe and increase the maintenance cost; moreover, the rigid connection cannot well adapt to the small displacement of the ventilation pipe in the dynamic environment of the tunnel. Once the ventilation pipe vibrates and shifts, the rigid fixing device may not be able to effectively maintain the correct position of the ventilation pipe, leading to unstable connection. This may cause air leakage of the ventilation pipe, affecting the ventilation effect, and even may cause local failures of the ventilation system; and during the installation and maintenance process, the flexibility of the rigid fixing structure is poor, and it cannot be used flexibly when adjusting and fixing the ventilation pipe or replacing local fittings. Therefore, it is necessary to propose a fixing device for tunnel ventilation pipes and a using method thereof. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a fixing device for tunnel ventilation pipes and a using method thereof to solve the problems mentioned in the above background art.

[0004] To achieve the above purpose, the present invention is realized by the following technical solutions: A fixing device for tunnel ventilation pipes includes a ventilation pipe, an upper arc hoop and a lower arc hoop. The upper arc hoop and the lower arc hoop are arranged opposite to each other up and down. The bottom of the lower arc hoop is fixedly provided with an installation base plate. Elastic inner supports are arranged at intervals on the inner sides of the lower arc hoop and the upper arc hoop, and the two inner supports are arranged with their arc openings opposite to each other and surround the outer circumference of the ventilation pipe.

[0005] On the opposite sides of the two inner support arcs, deformation tightening plates are fixedly locked at the arc openings, and the upper and lower deformation tightening plates elastically tighten the outer peripheral surface of the ventilation duct. A plurality of double elastic support members for elastically mounting the inner support arcs and elastically pressing the outer sides of the deformation tightening plates in multiple directions synchronously to fasten the ventilation duct are annularly arranged inside the upper arc hoop and the lower arc hoop;

[0006] Locking structures for detachable connection are arranged on both sides of the upper arc hoop and the lower arc hoop.

[0007] Preferably, the deformation tightening plate includes two completely separated first tightening surfaces and second tightening surfaces. The first tightening surface and the second tightening surface are made of flexible rubber material and are fixedly arranged on both sides of the arc opening of the inner support arc. After the inner support arcs of the upper arc hoop and the lower arc hoop relatively surround the ventilation duct, the first tightening surface and the second tightening surface respectively elastically tighten and surround the outer peripheral surface of the ventilation duct and respectively adapt to the uneven shape of the ventilation duct.

[0008] Preferably, transverse convex lines are arranged on the surfaces of the first tightening surface and the second tightening surface, and the ventilation duct is elastically and anti-slip closely attached through the transverse convex lines.

[0009] Preferably, the double elastic support member includes a lower elastic support group and an upper elastic support group. The lower elastic support group is installed between the inner support arc and the lower arc hoop, and the upper elastic support group is installed inside the inner support arc for supporting the deformation tightening plate.

[0010] Preferably, the lower elastic support group includes a first fixing plate fixedly locked on the inner side of the lower arc hoop and a second fixing plate fixedly locked on the outer side of the inner support arc. A plurality of outer ring springs are elastically installed between the first fixing plate and the second fixing plate for elastically supporting the inner support arc. A plurality of guide insertion rods are installed on the first fixing plate, and the guide insertion rods synchronously penetrate the inner support arc upward from the bottom of the second fixing plate and are connected to the upper elastic support group. The outer ring springs are sleeved on the guide insertion rods.

[0011] Preferably, the upper elastic support group includes a third fixing plate installed inside the inner support arc and a top plate arranged on one side of the third fixing plate. A plurality of inner ring springs are installed between the third fixing plate and the top plate. A plurality of sliding sleeve guide rods are fixedly arranged on one side of the top plate. The inner ring springs are sleeved on the sliding sleeve guide rods. The sliding sleeve guide rods synchronously penetrate the inner support arc downward from the upper side of the third fixing plate and are slidably sleeved on the corresponding guide insertion rods. And groove springs are arranged in the inner side chutes of the sliding sleeve guide rods, and the sliding sleeve guide rods and the guide insertion rods are elastically supported and connected through the groove springs.

[0012] Preferably, the top plate includes a front plate and a rear plate, and sliding sleeve guide rods are respectively fixedly arranged at the bottoms of the front plate and the rear plate. An elastic band is fixedly connected between the front plate and the rear plate, and after the front plate and the rear plate are staggered, they press against the uneven surface of the ventilation duct.

[0013] Preferably, one side of the front plate and the rear plate is in an arc shape and is in contact with the deformable tightening plate.

[0014] Preferably, connecting convex edges are provided at both ends of the openings of the lower arc hoop and the upper arc hoop. The locking structure includes a limiting rod vertically installed on the upper side of the connecting convex edge of the lower arc hoop. The limiting rod penetrates through the connecting convex edge of the upper arc hoop, and a screw rod is rotatably installed on the connecting convex edge on one side of the lower arc hoop. The top end of the screw rod threadedly penetrates through the connecting convex edge of the upper arc hoop. A hand wheel is installed at the bottom end of the screw rod, and the distance between the upper arc hoop and the lower arc hoop is driven by rotating the hand wheel through threaded transmission, so as to control the tightening degree of the inner support arc on the ventilation duct and the elastic pressing degree of the double elastic support members on the ventilation duct.

[0015] A using method of a fixing device for a tunnel ventilation duct. By installing and locking the installation bottom plate at a designated installation position in the tunnel, placing the ventilation duct on the deformable tightening plate on the lower arc hoop, and then covering the upper arc hoop on the upper side of the ventilation duct, the upper and lower deformable tightening plates can wrap the outer periphery of the ventilation duct. The locking structure is used to continuously adjust the downward displacement of the lower arc hoop, so that the two deformable tightening plates are deformed by force and synchronously tighten the ventilation duct, and the ventilation duct is flexibly supported inside the two inner support arcs. After the deformable tightening plate is deformed outward by force, a plurality of double elastic support members arranged in a circular array inside the two inner support arcs can not only elastically support on the outer side of the deformable tightening plate, so as to elastically support the ventilation duct in multiple directions, but also the double elastic support members can elastically support and connect the inner support arcs. These two elastic support forces act on the deformable tightening plate synchronously, so that the deformable tightening plate is in close contact with the ventilation duct.

[0016] By adopting the above technical solutions, the present invention has the following advantages compared with the prior art:

[0017] The present invention adjusts the upper arc hoop and the lower arc hoop that can be displaced relative to each other through the locking structure, and then makes the deformable tightening plates installed at the arc openings of the two inner support arcs deform towards the inside of the inner support arcs. Since the deformable tightening plate is made of elastic rubber material and has a certain elastic recovery force and durability, the upper and lower deformable tightening plates can be deformed to elastically tighten the ventilation duct. Compared with the prior art of fixed connection, it has stronger buffering and adaptability, and has a good seismic resistance effect and is not easy to cause wear to the ventilation duct and related accessories, improving the service life. Secondly, due to the anti-slip characteristic of the rubber material of the deformable tightening plate, the deformable tightening plate has a certain frictional force when tightening the ventilation duct, and combined with the corresponding transverse convex lines on the surface, the longitudinal anti-slip effect can be greatly improved, and the tightening stability is improved.

[0018] Moreover, a plurality of double elastic supports are installed on the inner sides of the upper arc hoop and the lower arc hoop. The double elastic supports can not only elastically support the inner support arc through the lower elastic support group to give it a primary elastic support force, keeping the inner support arc in a certain position, but also enable the inner support arc to have a secondary support force through the upper elastic support group, so that the upper elastic support group tightly presses the deformation tightening plate from all directions with high elasticity, strengthening the elastic support and fixation effect on the ventilation duct. At the same time, the sliding sleeve guide rod of the upper elastic support group can slide downward along the guide insertion rod of the lower elastic support group for guiding, avoiding deviation during elasticity, and a connecting groove spring between the guide insertion rod and the sliding sleeve guide rod provides a tertiary elastic support, improving the elastic support effect of the double elastic supports;

[0019] Furthermore, it is designed that since the deformation tightening plate is divided into a first tightening surface and a second tightening surface, the separate first tightening surface and second tightening surface can respectively tighten the concave and convex outer peripheral surfaces of different positions of the ventilation duct, realizing a multiple elastic tightening effect, and thus the contact applicability is better. In order to enable the double elastic supports to respectively press against the first tightening surface and the second tightening surface and increase the corresponding pressing forces, the top plate is also divided into a front plate and a rear plate, and an elastic band is connected between the front plate and the rear plate to pull each other. This allows the front plate and the rear plate to stagger and press against each other while maintaining the direction and position of the front plate and the rear plate, improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non - restrictive embodiments with reference to the accompanying drawings:

[0021] Figure 1 Schematic diagram of the usage device of the structure of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the inner support arc and the deformation tightening plate of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the inner support arc and the double elastic supports of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the double elastic supports of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the top plate of the present invention;

[0027] In the figure: ventilation duct 1, installation base plate 2, lower arc hoop 3, upper arc hoop 4, inner support arc 5, deformation tightening plate 6, first tightening surface 61, second tightening surface 62, transverse convex pattern 63, double elastic support member 7, lower elastic support group 71, first fixing plate 711, second fixing plate 712, outer ring spring 713, guide insertion rod 714, upper elastic support group 72, third fixing plate 721, top plate 722, front plate 7221, rear plate 7222, elastic band 7223, inner ring spring 723, sliding sleeve guide rod 724, groove spring 725, locking structure 8, limiting rod 81, screw rod 82, hand wheel 83, connecting convex edge 9. Detailed implementation manner

[0028] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the specific implementation manners.

[0029] As Figure 1-6 shown, the present invention provides a fixing device for a tunnel ventilation duct, including a ventilation duct 1, an upper arc hoop 4 and a lower arc hoop 3. The upper arc hoop 4 and the lower arc hoop 3 are arranged opposite to each other up and down. Among them, an installation base plate 2 is fixedly provided at the bottom of the lower arc hoop 3. Inner support arcs 5 are elastically arranged at intervals on the inner sides of the upper arc hoop 4 and the lower arc hoop 3, and the arc openings of the two inner support arcs 5 are arranged opposite to each other and surround the outer periphery of the ventilation duct 1. This setting mainly provides an elastic and stable outer frame. And deformation tightening plates 6 are locked at the arc openings on the opposite sides of the two inner support arcs 5. The deformation tightening plates 6 are made of elastic rubber material, which has a certain elastic restoring force, durability and anti-slip effect, and the ventilation duct 1 is elastically tightened by the upper and lower deformation tightening plates 6 on the outer peripheral surface. This structure can adapt to ventilation ducts 1 with different diameter specifications, has good seismic resistance, is not easy to cause wear to the ventilation duct 1 and related accessories, improves the service life, and because of the anti-slip characteristic of the rubber material of the deformation tightening plate 6, the deformation tightening plate 6 has a certain frictional force when tightening the ventilation duct 1, and combined with the corresponding transverse convex patterns 63 on the surface, the longitudinal anti-slip effect can be greatly improved, and the tightening stability is improved.

[0030] Among them, double elastic support members 7 for elastically installing the inner support arcs 5 and elastically pressing the outer sides of the deformation tightening plates 6 in multiple directions synchronously to fasten the ventilation duct 1 are arranged in an annular array on the inner sides of the upper arc hoop 4 and the lower arc hoop 3. In this embodiment, ten double elastic support members 7 are provided, and five are installed on each of the upper arc hoop 4 and the lower arc hoop 3. In this way, the double elastic support members 7 can elastically support the ventilation duct 1 in all directions of 360°. And locking structures 8 for mutual disassembly and connection are arranged on both sides of the upper arc hoop 4 and the lower arc hoop 3. Through the adjustment of the locking structure 8, the upper arc hoop 4 can be adjusted and clamped to the corresponding position, which is suitable for the tightening and clamping of ventilation ducts 1 with different specifications.

[0031] Among them, the deformation tightening plate 6 may further include two completely separated first tightening surfaces 61 and second tightening surfaces 62. The first tightening surface 61 and the second tightening surface 62 are made of flexible rubber material, and both ends are fixed on both sides of the arc opening of the inner support arc 5. When the inner support arcs 5 of the upper arc hoop 4 and the lower arc hoop 3 are relatively surrounded by the ventilation duct 1, the first tightening surface 61 and the second tightening surface 62 are respectively elastically tightened around the outer peripheral surface of the ventilation duct 1 and respectively adapt to the uneven shape of the ventilation duct 1, so that the contact effect is better.

[0032] In the above technical solution, the double elastic support 7 includes a lower elastic support group 71 and an upper elastic support group 72. The lower elastic support group 71 is installed between the inner support arc 5 and the lower arc hoop 3, and the upper elastic support group 72 is installed inside the inner support arc 5. Under the multiple elastic support of the lower elastic support group 71 and the upper elastic support group 72, the elastic contact effect and stability between the deformation tightening plate 6 and the ventilation duct 1 are improved; specifically, the lower elastic support group 71 includes a first fixing plate 711 fixed on the inner side of the lower arc hoop 3 and a second fixing plate 712 fixed on the outer side of the inner support arc 5. Two outer ring springs 713 are elastically installed between the first fixing plate 711 and the second fixing plate 712, both of which are used to elastically support the inner support arc 5 to maintain a certain position. The first fixing plate 711 is provided with a plurality of guide insertion rods 714, and the outer ring springs 713 are sleeved on the guide insertion rods 714. The guide insertion rods 714 penetrate the inner support arc 5 upward synchronously from the bottom of the second fixing plate 712, playing a guiding role to prevent the inner support arc 5 from tilting due to insufficient lateral support force during use, and the end of the guide insertion rod 714 is connected to the upper elastic support group 72. During use, it can play a further linkage effect with the upper elastic support group 72; specifically, the upper elastic support group 72 includes a third fixing plate 721 installed inside the inner support arc 5 and a top plate 722 arranged on one side of the third fixing plate 721. The third fixing plate 721 is on the same line as the first fixing plate 711 and the second fixing plate 712. A plurality of inner ring springs 723 are installed between the third fixing plate 721 and the top plate 722. A plurality of sliding sleeve guide rods 724 are fixed on one side of the top plate 722, and the inner ring springs 723 are sleeved on the sliding sleeve guide rods 724. Such a setting is mainly to utilize the elastic action of the inner ring springs 723, combine with the outer ring springs 713 to produce a double elastic effect and act on the top plate 722 together, so as to improve the pressing effect of the top plate 722 on the deformation tightening plate 6 and stably support the ventilation duct 1 in combination with its own elastic tightening effect.

[0033] Moreover, the sliding sleeve guide rod 724 penetrates downwardly through the inner support arc 5 synchronously from the upper side of the third fixing plate 721, and is slidably sleeved on the corresponding guide insertion rod 714. This setting can ensure the movement stability of the sliding sleeve guide rod 724 on the guide insertion rod 714, improve the structural strength of the sliding sleeve guide rod 724 and the guide insertion rod 714, and prevent it from deviating or breaking from the side. Further, a groove spring 725 is arranged in the inner chute of the sliding sleeve guide rod 724, and is elastically supported and connected to the guide insertion rod 714 through the groove spring 725. In this way, when the sliding sleeve guide rod 724 displaces along the guide insertion rod 714, it can play a third elastic support under the action of the groove spring 725, further improving the elastic support effect.

[0034] In order to enable the double elastic support 7 to press against the first tightening surface 61 and the second tightening surface 62 respectively, and increase the corresponding pressing force respectively, the top plate 722 includes a front plate 7221 and a rear plate 7222. The two sliding sleeve guide rods 724 are respectively installed at the bottoms of the front plate 7221 and the rear plate 7222. A stretchable band 7223 is fixedly connected between the front plate 7221 and the rear plate 7222 to hold each other and maintain the direction. The stretchable band 7223 can be made of cloth, plastic or rubber material with elastic stretching effect. In this way, the stretchable band 7223 can also deform, enabling the front plate 7221 and the rear plate 7222 to stagger and press against the concave and convex surfaces at different positions of the ventilation duct 1. One side of the front plate 7221 and the rear plate 7222 is arc-shaped and contacts the deformed tightening plate 6 to reduce wear.

[0035] In this embodiment, connecting convex edges 9 are provided at both ends of the openings of the lower arc hoop 3 and the upper arc hoop 4. The locking structure 8 includes a limiting rod 81 vertically installed on the upper side of the connecting convex edge 9 of the lower arc hoop 3. The limiting rod 81 penetrates through the connecting convex edge 9 of the upper arc hoop 4. A screw rod 82 is rotatably installed on the connecting convex edge 9 on one side of the lower arc hoop 3. The top end of the screw rod 82 threadedly penetrates through the connecting convex edge 9 of the upper arc hoop 4. A hand wheel 83 is installed at the bottom end of the screw rod 82. By rotating the hand wheel 83, the distance between the upper arc hoop 4 and the lower arc hoop 3 can be adjusted by screw thread, the tightening degree of the inner support arc 5 on the ventilation duct 1 and the elastic pressing degree of the double elastic support 7 on the ventilation duct 1 can be controlled. Moreover, the top end of the limiting rod 81 can be conical, making it simpler and more convenient to insert into the corresponding hole of the connecting convex edge 9 of the upper arc hoop 4.

[0036] A more specific method of use is to install and lock the installation base plate 2 on the designated installation position in the tunnel, and place the ventilation duct 1 on the deformation tightening plate 6 on the lower arc hoop 3, that is, on the upper side of the first tightening surface 61 and the second tightening surface 62, and respectively contact the different surface positions of the front and rear of the ventilation duct 1 through the first tightening surface 61 and the second tightening surface 62, so as to adapt to different shapes and concave and convex surfaces, and the transverse convex pattern 63 strengthens the anti-slip effect on the surface of the ventilation duct 1, and then cover the upper arc hoop 4 on the upper side of the ventilation duct 1, so that the upper and lower deformation tightening plates 61 and 62 are connected to each other. The first tightening surface 61 and the second tightening surface 62 of the plate 6 wrap around the outer periphery of the ventilation duct 1, and continuously adjust the downward displacement of the lower arc hoop 3 through the locking structure 8, specifically by turning the hand wheel 83 to make the screw 82 threadedly drive the upper arc hoop 4 to move downward along the limit rod 81, so that the first tightening surface 61 and the second tightening surface 62 of the two deformation tightening plates 6 are deformed by force and synchronously tighten the ventilation duct 1, so that the ventilation duct 1 can be flexibly supported on the inner sides of the two inner support arcs 5, which is beneficial to prevent wear caused by vibration and improve the connection adaptability, and the deformation After the tightening plate 6 is deformed outward by force, the double elastic support members 7 of the inner annular array of the two inner support arcs 5 can not only be elastically supported on the outer side of the deformed tightening plate 6 through the inner ring spring 723 of the third fixing plate 721 of the upper elastic support group 72 and the top plate 722, thereby realizing multi-directional elastic support for the ventilation duct 1, but the lower elastic support group 71 of the double elastic support members 7 can also elastically support and connect the inner support arc 5, so that the inner support arc 5 is elastically maintained in a certain position, and the elastic force is applied to the top plate 722 together, so that the top plate 722 has double elastic support. The heavy elastic supporting force acts synchronously on the deformation tightening plate 6, thereby improving the close contact effect between the deformation tightening plate 6 and the ventilation duct 1; and when the top plate 722 is subjected to force, the sliding guide rod 724 is allowed to slide toward the guide rod 714, which can effectively ensure its sliding guiding function, and utilize the inner ring spring 723 on the inner side of the sliding guide rod 724 to elastically support the guide rod 714, thereby forming a third elastic supporting function; and the front plate 7221 and the rear plate 7222 of the top plate 722 can be staggered and displaced, so as to better adapt to the different shapes and positions of the top tightening ventilation duct 1 individually.

[0037] It should be noted that the tunnel ventilation duct fixing device of the present invention mainly improves the above-mentioned structure, and the functions, components and structures not mentioned therein can be implemented by using components and structures in the prior art that can realize the corresponding functions.

[0038] The present invention has been described in detail above through specific embodiments, but these do not constitute a limitation of the present invention. Without departing from the principle of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A fixing device for a tunnel ventilation duct, characterized in that, Comprising: A ventilation duct (1); An upper arc hoop (4) and a lower arc hoop (3), the upper arc hoop (4) and the lower arc hoop (3) are arranged opposite to each other up and down, wherein a mounting bottom plate (2) is fixedly provided at the bottom of the lower arc hoop (3), and inner support arcs (5) are elastically arranged at intervals on the inner sides of the lower arc hoop (3) and the upper arc hoop (4), and the arc openings of the two inner support arcs (5) are arranged opposite to each other and surround the outer periphery of the ventilation duct (1); A deformation tightening plate (6) is locked at the arc opening on the opposite side of the two inner support arcs (5), and the ventilation duct (1) is elastically tightened on the outer peripheral surface by the upper and lower deformation tightening plates (6). A plurality of double elastic support members (7) for elastically mounting the inner support arcs (5) and elastically pressing the outer side of the deformation tightening plate (6) in multiple directions synchronously to fasten the ventilation duct (1) are annularly arranged on the inner sides of the upper arc hoop (4) and the lower arc hoop (3); Locking structures (8) for mutual disassembly and connection are arranged on both sides of the upper arc hoop (4) and the lower arc hoop (3); The double elastic support member (7) comprises a lower elastic support group (71) and an upper elastic support group (72); The lower elastic support group (71) comprises a first fixing plate (711) locked on the inner side of the lower arc hoop (3) and a second fixing plate (712) locked on the outer side of the inner support arc (5). A plurality of outer ring springs (713) are elastically installed between the first fixing plate (711) and the second fixing plate (712) for elastically supporting the inner support arc (5). The first fixing plate (711) is provided with a plurality of guide insertion rods (714), and the guide insertion rods (714) penetrate through the inner support arc (5) upward synchronously from the bottom of the second fixing plate (712) and are connected to the upper elastic support group (72). The outer ring springs (713) are sleeved on the guide insertion rods (714).

2. The fixing device for a tunnel ventilation duct according to claim 1, characterized in that, The deformation tightening plate (6) comprises two completely separated first tightening surfaces (61) and second tightening surfaces (62). The first tightening surfaces (61) and the second tightening surfaces (62) are made of flexible rubber material and are fixedly provided at both sides of the arc opening of the inner support arc (5). When the inner support arcs (5) of the upper arc hoop (4) and the lower arc hoop (3) surround the ventilation duct (1) relatively, the first tightening surfaces (61) and the second tightening surfaces (62) are respectively elastically tightened around the outer peripheral surface of the ventilation duct (1) and respectively adapt to the uneven shape of the ventilation duct (1).

3. The fixing device for a tunnel ventilation duct according to claim 2, wherein, Transverse convex stripes (63) are provided on the surfaces of the first tightening surface (61) and the second tightening surface (62), and the ventilation duct (1) is elastically and anti-slip closely attached through the transverse convex stripes (63).

4. A tunnel ventilation duct fixing device according to claim 1 or 2, characterized in that, The lower elastic support group (71) is installed between the inner support arc (5) and the lower arc hoop (3), and the upper elastic support group (72) is installed on the inner side of the inner support arc (5) for supporting the deformation tightening plate (6).

5. The fixing device for a tunnel ventilation duct according to claim 4, characterized in that, The upper elastic support group (72) includes a third fixing plate (721) installed inside the inner support arc (5) and a top plate (722) arranged on one side of the third fixing plate (721). A plurality of inner ring springs (723) are installed between the third fixing plate (721) and the top plate (722). A plurality of sliding sleeve guide rods (724) are fixedly arranged on one side of the top plate (722). The inner ring springs (723) are sleeved on the sliding sleeve guide rods (724). The sliding sleeve guide rods (724) penetrate through the inner support arc (5) downward synchronously from the upper side of the third fixing plate (721) and are slidably sleeved on the corresponding guide insertion rods (714). A groove spring (725) is arranged in the inner chute of the sliding sleeve guide rod (724), and the groove spring (725) is elastically supported and connected to the guide insertion rod (714).

6. The fixed device for a tunnel ventilation duct according to claim 5, wherein The top plate (722) includes a front plate (7221) and a rear plate (7222), and sliding sleeve guide rods (724) are fixedly arranged at the bottoms of the front plate (7221) and the rear plate (7222) respectively. An elastic band (7223) is fixedly connected between the front plate (7221) and the rear plate (7222). After the front plate (7221) and the rear plate (7222) are staggered, they are tightly pressed against the concave-convex surface of the ventilation duct (1).

7. The fixing device for a tunnel ventilation duct according to claim 6, characterized in that, One side of the front plate (7221) and the rear plate (7222) is arc-shaped and contacts the deformation tightening plate (6).

8. A fixing device for a tunnel ventilation duct according to claim 1, characterized in that, Connection convex edges (9) are arranged at both ends of the openings of the lower arc hoop (3) and the upper arc hoop (4). The locking structure (8) includes a limiting rod (81) vertically installed on the upper side of the connection convex edge (9) of the lower arc hoop (3). The limiting rod (81) penetrates through the connection convex edge (9) of the upper arc hoop (4). A screw rod (82) is rotatably installed on the connection convex edge (9) on one side of the lower arc hoop (3). The top end of the screw rod (82) threadedly penetrates through the connection convex edge (9) of the upper arc hoop (4). A hand wheel (83) is installed at the bottom end of the screw rod (82). By rotating the hand wheel (83), the distance between the upper arc hoop (4) and the lower arc hoop (3) is threadedly driven, the tightening degree of the inner support arc (5) on the ventilation duct (1) is controlled, and the elastic pressing degree of the double elastic support member (7) on the ventilation duct (1) is controlled.

9. The method of using a fixing device for a tunnel ventilation duct according to claim 1, characterized in that, By installing and locking the installation base plate (2) at the designated installation station in the tunnel, placing the ventilation duct (1) on the deformation tightening plate (6) on the lower arc hoop (3), and then covering the upper arc hoop (4) on the upper side of the ventilation duct (1), the upper and lower deformation tightening plates (6) can wrap the outer circumference of the ventilation duct (1). By continuously adjusting the downward displacement of the lower arc hoop (3) through the locking structure (8), the two deformation tightening plates (6) are deformed by force and simultaneously tighten the ventilation duct (1), flexibly supporting the ventilation duct (1) inside the two inner support arcs (5). After the deformation tightening plate (6) is deformed outward under force, the multiple double elastic support members (7) arranged in a circular array inside the two inner support arcs (5) can not only elastically support the outer side of the deformation tightening plate (6), thus elastically supporting the ventilation duct (1) in multiple directions, but also elastically support and connect the inner support arcs (5). These two elastic support forces act on the deformation tightening plate (6) simultaneously, making the deformation tightening plate (6) in close contact with the ventilation duct (1).

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