Tunnel ventilation pipeline fixing device and using method thereof

Abstract

The invention relates to the technical field of ventilation pipe fixing structures, in particular to a tunnel ventilation pipe fixing device and a using method thereof.The tunnel ventilation pipe fixing device comprises a ventilation pipe, an upper arc hoop and a lower arc hoop, the upper arc hoop and the lower arc hoop are oppositely arranged up and down, and a mounting bottom plate is fixedly arranged at the bottom of the lower arc hoop; inner supporting arcs are elastically arranged on the inner side of the lower arc hoop and the inner side of the upper arc hoop at intervals, the locking structure is used for adjusting the upper arc hoop and the lower arc hoop which can move relatively, and then deformation tightening plates installed at arc openings of the two inner supporting arcs deform towards the inner sides of the inner supporting arcs. Due to the fact that the deformation tightening plates are made of elastic rubber materials and have certain elastic restoring force and durability, the upper deformation tightening plate and the lower deformation tightening plate deform to elastically tighten the ventilation pipeline, and compared with fixed connection in the prior art, the ventilation pipeline fixing device is higher in buffering performance and adaptability. And the anti-seismic effect is good, the ventilation pipeline and related accessories are not prone to being abraded, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation pipe fixing structures, and in particular to a tunnel ventilation duct fixing device and a use method thereof. Background Art

[0002] In the field of tunnel engineering, ventilation systems are of vital importance, and the fixation of ventilation ducts is one of the key links. The traditional tunnel ventilation duct fixation method is relatively simple, mainly using simple clamps or ventilation duct fixing frames. Common clamps fix the ventilation duct by surrounding the ventilation duct and connecting it to the supporting structure, and the ventilation duct fixing frame places the ventilation duct on a specific frame structure for position limiting. Most of these existing fixing devices use rigid fixing structures to achieve the locking effect of the ventilation duct. Rigid structure means lack of buffering and deformation adaptation ability at the connection point; the internal environment of the tunnel is complex, and vibrations often occur. Due to ground vibrations caused by vehicle driving, slight deformation of the tunnel structure itself under external pressure (such as stratum pressure, etc.), and vibrations caused by earthquakes, this vibration will cause the ventilation duct to shift. The existing rigid fixing structure lacks elasticity, and relative displacement will occur between the ventilation duct and the fixing device, causing wear on the ventilation duct and accessories; long-term wear will reduce the service life of the ventilation duct and increase maintenance costs; and the rigid connection cannot adapt well to the slight displacement of the ventilation duct when facing the dynamic environment in the tunnel. Once the ventilation duct vibrates and shifts, the rigid fixing device may not be able to effectively maintain the correct position of the ventilation duct, resulting in unstable connection. This may cause air leakage in the ventilation duct, affect the ventilation effect, and may even cause local failure of the ventilation system; and during the installation and maintenance process, the rigid fixed structure has poor flexibility and cannot be used flexibly when adjusting and fixing the ventilation duct or replacing local accessories. Therefore, it is necessary to propose a tunnel ventilation duct fixing device and a method of using it. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a tunnel ventilation duct fixing device and a method of using the same to solve the problems mentioned in the above background technology.

[0004] In order to achieve the above-mentioned object, the present invention is implemented through the following technical solutions: a tunnel ventilation duct fixing device, comprising a ventilation duct, an upper arc hoop and a lower arc hoop, wherein the upper arc hoop and the lower arc hoop are arranged opposite to each other up and down, wherein a mounting base plate is fixedly arranged at the bottom of the lower arc hoop, inner supporting arcs are elastically arranged at intervals on the inner sides of the lower arc hoop and the upper arc hoop, and two inner supporting arc openings are arranged opposite to each other and surround the outer periphery of the ventilation duct; The arc openings on the opposite sides of the two inner support arcs are locked with deformable tightening plates, and are elastically tightened on the outer peripheral surface of the ventilation duct through the upper and lower deformable tightening plates. The inner annular array of the upper arc hoop and the lower arc hoop is provided with a plurality of double elastic support members for elastically installing the inner support arcs and multi-directional synchronous elastic tightening of the outer side of the deformable tightening plate to tighten the ventilation duct; The upper arc hoop and the lower arc hoop are provided with locking structures which are detachably connected to each other on both sides.

[0005] Preferably, the deformable 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 the two ends are fixed on both sides of the inner supporting arc opening. When the inner supporting arcs of the upper arc hoop and the lower arc hoop are relatively surrounded by the ventilation duct, the first tightening surface and the second tightening surface are elastically tightened and surrounded by the outer peripheral surface of the ventilation duct, and respectively adapt to the uneven shape of the ventilation duct.

[0006] Preferably, the surfaces of the first tightening surface and the second tightening surface are both provided with transverse convex patterns, and the first tightening surface and the second tightening surface are elastically non-slip and tightly attached to the ventilation duct through the transverse convex patterns.

[0007] 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 on the inner side of the inner support arc for supporting the deformation tightening plate.

[0008] Preferably, the lower elastic support group includes a first fixed plate locked on the inner side of the lower arc hoop and a second fixed plate locked on the outer side of the inner support arc, a plurality of outer ring springs are elastically installed between the first fixed plate and the second fixed plate for elastically supporting the inner support arc, the first fixed plate is installed with a plurality of guide rods, which synchronously penetrate the inner support arc from the bottom of the second fixed plate upward and are connected to the upper elastic support group, and the outer ring springs are sleeved on the guide rods.

[0009] Preferably, the upper elastic support group includes a third fixed plate installed on the inner side of the inner support arc and a top plate arranged on one side of the third fixed plate, a plurality of inner ring springs are installed between the third fixed plate and the top plate, a plurality of sliding sleeve guide rods are fixed on one side of the top plate, the inner ring springs are sleeved on the sliding sleeve guide rod, the sliding sleeve guide rod synchronously penetrates the inner support arc from the upper side of the third fixed plate downward, and is slidably sleeved on the corresponding guide rod, and a slot spring is provided in the inner sliding groove of the sliding sleeve guide rod, which is elastically supported and connected to the guide rod through the slot spring.

[0010] Preferably, the top plate includes a front plate and a rear plate, and sliding sleeve guide rods are fixed to the bottom of the front plate and the rear plate respectively, an elastic band is locked and connected between the front plate and the rear plate, and the front plate and the rear plate are staggered to press against the concave and convex surface of the ventilation duct.

[0011] Preferably, one side of the front plate and the rear plate is in an arc shape and is in contact with the deformation tightening plate.

[0012] Preferably, both ends of the openings of the lower arc hoop and the upper arc hoop are provided with connecting ridges, and the locking structure includes a limit rod vertically installed on the upper side of the connecting ridge of the lower arc hoop, the limit rod is penetrated by the connecting ridge of the upper arc hoop, and the connecting ridge on one side of the lower arc hoop is rotatably installed with a screw, the top thread of the screw penetrates the connecting ridge of the upper arc hoop, and the bottom end of the screw is installed with a hand wheel, and the distance between the upper arc hoop and the lower arc hoop is transmitted by rotating the hand wheel thread, the tightening degree of the inner support arc on the ventilation duct and the elastic tightening degree of the double elastic support member on the ventilation duct are controlled.

[0013] A method for using a tunnel ventilation duct fixing device, which comprises the following steps: installing and locking an installation base plate on a designated installation position in the tunnel, placing the ventilation duct on a deformable tightening plate on a lower arc hoop, and then covering the upper arc hoop on the upper side of the ventilation duct, so that the upper and lower deformable tightening plates wrap the outer periphery of the ventilation duct, and continuously adjusting the downward displacement of the lower arc hoop through a locking structure, so that the two deformable tightening plates are deformed by force and synchronously tighten the ventilation duct, and the ventilation duct is flexibly supported on the inner sides of two inner supporting arcs, and after the deformable tightening plates are deformed outward by force, a plurality of double elastic support members in an annular array on the inner sides of the two inner supporting arcs can not only elastically support the outer sides of the deformable tightening plates, thereby elastically supporting the ventilation duct in multiple directions, but the double elastic support members can also elastically support and connect the inner supporting arcs, and the two elastic supporting forces act on the deformable tightening plates synchronously, so that the deformable tightening plates are in close contact with the ventilation duct.

[0014] By adopting the above technical solution, the present invention has the following advantages compared with the existing technology: The present invention uses a locking structure to adjust the two upper arc hoops and the lower arc hoops that can be relatively displaced, so that the two deformable tightening plates installed at the arc openings of the inner supporting arcs are deformed toward the inner side of the inner supporting arcs. Since the deformable tightening plates are made of elastic rubber material and have a certain elastic recovery force and durability, the upper and lower deformable tightening plates are deformed to elastically tighten the ventilation duct, which has stronger buffering and adaptability than the fixed connection in the prior art, and has good anti-seismic effect and is not easy to cause wear to the ventilation duct and related accessories, thereby improving the service life; secondly, due to the anti-slip characteristics of the rubber material of the deformable tightening plate, the deformable tightening plate has a certain friction when tightening the ventilation duct, and combined with the corresponding transverse convex patterns on the surface, it can greatly improve its longitudinal anti-slip effect and improve the tightening stability; Moreover, a plurality of double elastic support members are installed on the inner sides of the upper arc hoop and the lower arc hoop, and the double elastic support members can not only elastically support the inner support arc through the lower elastic support group so that it has a primary elastic support force, so that the inner support arc is kept in a certain position, but also allow the inner support arc to have a secondary support force through the upper elastic support group, so that the upper elastic support group can highly elastically press the deformation tightening plate from all directions, thereby strengthening the elastic support and fixing effect of the ventilation duct, and 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 to avoid deviation during elasticity, and the connecting groove spring between the guide insertion rod and the sliding sleeve guide rod performs three times of elastic support, thereby improving the elastic support effect of the double elastic support member; A further design is that since the deformation tightening plate is divided into a first tightening surface and a second tightening surface, the concave and convex outer peripheral surfaces at different positions of the ventilation duct can be tightened separately by the separated first tightening surface and the second tightening surface, thereby realizing multiple elastic tightening effects and improving the contact applicability; and in order to allow the double elastic support members to tighten the first tightening surface and the second tightening surface respectively and increase the corresponding tightening forces respectively, the top plate is also divided into a front plate and a rear plate, and the front plate and the rear plate are connected by an elastic band to pull each other, so that the front plate and the rear plate can be staggered and tightened while maintaining the direction and position of the front plate and the rear plate, thereby improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of a device for using the structure of the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the structure of the inner support arc and the deformation tightening plate of the present invention; Figure 4 It is a schematic diagram of the structure of the inner support arc and the double elastic support member of the present invention; Figure 5 It is a schematic structural diagram of a double elastic support member of the present invention; Figure 6 It is a structural schematic diagram of the top plate of the present invention; 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 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, slot spring 725, locking structure 8, limit rod 81, screw 82, hand wheel 83, connecting convex edge 9. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figure 1-6 As shown, the present invention provides a tunnel ventilation duct fixing device, 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, wherein the bottom of the lower arc hoop 3 is fixed with a mounting base 2, the inner sides of the upper arc hoop 4 and the lower arc hoop 3 are elastically spaced with inner support arcs 5, and the arc openings of the two inner support arcs 5 are arranged opposite to each other and surrounded by the outer periphery of the ventilation duct 1, the arrangement mainly provides an elastic and stable outer frame, and the arc openings on the opposite sides of the two inner support arcs 5 are locked with a deformable tightening plate 6, and the deformable tightening plate 6 is made of elastic rubber material It is made of, which has a certain elastic recovery force, durability and anti-skid effect, and is elastically tightened on the outer peripheral surface of the ventilation duct 1 through the upper and lower deformable tightening plates 6. This structure can adapt to ventilation ducts 1 of different diameters, and has good shock resistance. It is not easy to cause wear to the ventilation duct 1 and related accessories, thereby improving the service life. Moreover, due to the anti-skid properties of the rubber material of the deformable tightening plate 6, the deformable tightening plate 6 has a certain friction when tightening the ventilation duct 1, and combined with the corresponding transverse convex grooves 63 on the surface, it can greatly improve its longitudinal anti-skid effect and improve the tightening stability.

[0018] Among them, the inner annular array of the upper arc hoop 4 and the lower arc hoop 3 is provided with a double elastic support member 7 for elastically installing the inner support arc 5, and the outer side of the multi-directional synchronous elastic top tightening deformation tightening plate 6 for fastening the ventilation duct 1. In this embodiment, the double elastic support members 7 are arranged in ten numbers, and the upper arc hoop 4 and the lower arc hoop 3 are installed with five each, so that the double elastic support members 7 can elastically support the ventilation duct 1 in an all-round manner of 360°, and the upper arc hoop 4 and the lower arc hoop 3 are provided with locking structures 8 that are detachably connected to each other on both sides. 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 tightening and clamping ventilation ducts 1 of different specifications.

[0019] Among them, the deformable tightening plate 6 can also 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 the two ends are fixed on both sides of the arc opening of the inner supporting arc 5. When the inner supporting arc 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 elastically tightened and surrounded by 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.

[0020] In the above technical scheme, the double elastic support member 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 on the inner side of the inner support arc 5. Under the multiple elastic support effects 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 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, 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, and the first fixing plate 711 is installed with a plurality of guide rods 714, the outer ring springs 713 are sleeved on the guide rods 714, and the guide rods 714 are synchronously penetrated from the bottom of the second fixing plate 712 upward through the inner support arc 5, playing a guiding role, When the cam 72 is in the unlocking state, the locking cam 722 is locked to the unlocking state, and the locking cam 723 is locked to the unlocking state, so that the cam 722 can be unlocked easily.

[0021] The cam 724 is provided with a groove spring 725 which is elastically supported by the guide rod 714 and is connected to the guide rod 714 through the groove spring 725. In this way, when the sliding sleeve guide rod 724 is displaced along the guide rod 714, the sliding sleeve guide rod 724 can play a third elastic support role under the action of the groove spring 725, thereby further improving the elastic support effect.

[0022] In order to enable the double elastic support member 7 to tighten the first tightening surface 61 and the second tightening surface 62 respectively and increase the corresponding tightening force respectively, the top plate 722 includes a front plate 7221 and a rear plate 7222, and two sliding guide rods 724 are respectively installed at the bottom of the front plate 7221 and the rear plate 7222, and the front plate 7221 and the rear plate 7222 are locked and connected with an elastic band 7223, which can pull each other to maintain the direction, and the elastic band 7223 can be a cloth, plastic or rubber material with elastic stretching effect, so that the elastic band 7223 can also be deformed, so that the front plate 7221 and the rear plate 7222 can be staggered to tighten the concave and convex surfaces of different positions of the ventilation duct 1, and one side of the front plate 7221 and the rear plate 7222 is in an arc shape, and is in contact with the deformation tightening plate 6 to reduce wear.

[0023] In this embodiment, both ends of the openings of the lower arc hoop 3 and the upper arc hoop 4 are provided with connecting ridges 9, and the locking structure 8 includes a limiting rod 81 vertically installed on the upper side of the connecting ridge 9 of the lower arc hoop 3, the limiting rod 81 passes through the connecting ridge 9 of the upper arc hoop 4, and the connecting ridge 9 on one side of the lower arc hoop 3 is rotatably installed with a screw 82, the top end of the screw 82 threadedly passes through the connecting ridge 9 of the upper arc hoop 4, and a hand wheel 83 is installed at the bottom end of the screw 82, and the hand wheel 83 is threadedly rotated to transmit the distance between the upper arc hoop 4 and the lower arc hoop 3, and the tightening degree of the inner support arc 5 on the ventilation duct 1 and the elastic tightening degree of the double elastic support member 7 on the ventilation duct 1 are controlled, and the top end of the limiting rod 81 can be conical, so it is easier and more convenient to insert it into the corresponding hole of the connecting ridge 9 of the upper arc hoop 4.

[0024] 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.

[0025] 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.

[0026] The present invention has been described in detail above through specific embodiments, but these do not constitute limitations 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 considered as the protection scope of the present invention.

Claims

1. A tunnel ventilation duct fixing device, characterized in that: include: Ventilation duct (1); An upper arc hoop (4) and a lower arc hoop (3), wherein the upper arc hoop (4) and the lower arc hoop (3) are arranged opposite to each other in the upper and lower parts, wherein a mounting base plate (2) is fixedly provided at the bottom of the lower arc hoop (3), and inner supporting 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 supporting arcs (5) are arranged opposite to each other and surround the outer periphery of the ventilation duct (1); The arc openings on opposite sides of the two inner support arcs (5) are locked with deformable tightening plates (6), and the upper and lower deformable tightening plates (6) are elastically tightened on the outer peripheral surface of the ventilation duct (1); a plurality of double elastic support members (7) for elastically mounting the inner support arcs (5) and for multi-directional synchronous elastic tightening of the outer sides of the deformable tightening plates (6) to tighten the ventilation duct (1) are arranged in an annular array inside the upper arc hoop (4) and the lower arc hoop (3); The upper arc hoop (4) and the lower arc hoop (3) are provided with locking structures (8) on both sides thereof that are detachably connected to each other.

2. A tunnel ventilation duct fixing device according to claim 1, characterized in that: The deformable 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) being made of a flexible rubber material, and having two ends fixedly arranged on both sides of the arc opening of the inner supporting arc (5); when the inner supporting 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 and surrounded by the outer peripheral surface of the ventilation duct (1), and respectively adapt to the uneven shape of the ventilation duct (1).

3. A tunnel ventilation duct fixing device according to claim 2, characterized in that: The first tightening surface (61) and the second tightening surface (62) are both provided with transverse convex patterns (63) on their surfaces, and are elastically non-slip and tightly attached to the ventilation duct (1) via the transverse convex patterns (63).

4. A tunnel ventilation duct fixing device according to claim 1 or 2, characterized in that: 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) 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) and is used to support the deformation tightening plate (6).

5. A tunnel ventilation duct fixing device according to claim 4, characterized in that: 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); a plurality of guide rods (714) are installed on the first fixing plate (711); the guide rods (714) are synchronously extended upward from the bottom of the second fixing plate (712) through the inner support arc (5) and are connected to the upper elastic support group (72); the outer ring springs (713) are sleeved on the guide rods (714).

6. A tunnel ventilation duct fixing device according to claim 5, characterized in that: The upper elastic support group (72) comprises a third fixed plate (721) mounted on the inner side of the inner support arc (5) and a top plate (722) arranged on one side of the third fixed plate (721); a plurality of inner ring springs (723) are mounted between the third fixed 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) synchronously penetrate the inner support arc (5) from the upper side of the third fixed plate (721) downward, and are slidably sleeved on the corresponding guide rods (714); a slot spring (725) is arranged in the inner side sliding groove of the sliding sleeve guide rod (724), and is elastically supported and connected to the guide rods (714) via the slot spring (725).

7. A tunnel ventilation duct fixing device according to claim 6, characterized in that: The top plate (722) comprises a front plate (7221) and a rear plate (7222), and a sliding sleeve guide rod (724) is fixedly provided at the bottom of the front plate (7221) and the rear plate (7222), respectively; an elastic band (7223) is locked and connected between the front plate (7221) and the rear plate (7222), and the front plate (7221) and the rear plate (7222) are staggered to press against the concave and convex surface of the ventilation duct (1).

8. A tunnel ventilation duct fixing device according to claim 7, characterized in that: One side of the front plate (7221) and the rear plate (7222) is in an arc shape and is in contact with the deformation tightening plate (6).

9. A tunnel ventilation duct fixing device according to claim 1, characterized in that: Both ends of the openings of the lower arc hoop (3) and the upper arc hoop (4) are provided with connecting convex edges (9), and the locking structure (8) comprises a limiting rod (81) vertically mounted on the upper side of the connecting convex edge (9) of the lower arc hoop (3), the limiting rod (81) passes through the connecting convex edge (9) of the upper arc hoop (4), and a screw rod (82) is rotatably mounted on the connecting convex edge (9) on one side of the lower arc hoop (3), the top end of the screw rod (82) threadably passes through the connecting convex edge (9) of the upper arc hoop (4), and a hand wheel (83) is mounted on the bottom end of the screw rod (82), and the hand wheel (83) is rotated to threadably drive the distance between the upper arc hoop (4) and the lower arc hoop (3), control the degree of tightening of the inner support arc (5) on the ventilation duct (1), and control the degree of elastic tightening of the double elastic support member (7) on the ventilation duct (1).

10. The method for using the tunnel ventilation duct fixing device according to claim 1, characterized in that: The installation base plate (2) is installed and locked on a designated installation position in the tunnel, and the ventilation duct (1) is placed on the deformable tightening plate (6) on the lower arc hoop (3), and then the upper arc hoop (4) is covered on the upper side of the ventilation duct (1), so that the upper and lower deformable tightening plates (6) wrap around the outer periphery of the ventilation duct (1), and the lower arc hoop (3) is continuously adjusted to move downward through the locking structure (8), so that the two deformable tightening plates (6) are deformed by force and simultaneously tighten the ventilation duct (1), so that the ventilation duct (1) is flexibly supported on both sides. The inner sides of the inner support arcs (5) are connected to the deformable tightening plates (6), and after the deformable tightening plates (6) are deformed outwards under force, the multiple double elastic support members (7) in the annular array on the inner sides of the two inner support arcs (5) can not only elastically support the outer sides of the deformable tightening plates (6), thereby elastically supporting the ventilation duct (1) in multiple directions, but the double elastic support members (7) can also elastically support and connect the inner support arcs (5). The two elastic support forces act on the deformable tightening plates (6) synchronously, so that the deformable tightening plates (6) are in close contact with the ventilation duct (1).

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