Ventilation inclined shaft capable of sending and exhausting air through double-line tunnel

Abstract

This invention relates to the field of ventilation inclined shaft technology and discloses a ventilation inclined shaft capable of supplying and exhausting air to a twin-track tunnel. The shaft includes an inclined tunnel connected to the main tunnel of the twin-track tunnel. Several sets of support frame assemblies are supported inside the inclined tunnel. A top support connecting assembly connects the top walls of adjacent support frame assemblies, and an axial flow fan is installed at the bottom of the top support connecting assembly. Side support connecting assemblies connect the side walls of adjacent support frame assemblies. The diagonal bracing arms on both sides of the top support connecting assembly are fixed to the top of the side support connecting assembly, and the outer ends of the side support connecting assembly are cast and fixed in pouring holes in the inner wall of the inclined tunnel. This invention uses multiple sets of interconnected support frame assemblies, top support connecting assemblies, and side support connecting assemblies to form an integrated mesh support system, resulting in uniform stress distribution and high support strength. The steel reinforcement skeleton of the side support connecting assembly is cast and anchored to the inner wall of the inclined tunnel, achieving integrated consolidation between the structure and the tunnel wall, and exhibiting excellent pull-out and sway resistance.

Description

Technical Field

[0001] This invention relates to the field of ventilation inclined shaft technology, specifically a ventilation inclined shaft capable of supplying and exhausting air to a dual-track tunnel. Background Technology

[0002] During the construction and operation of dual-track tunnels, ventilation shafts are often used to supply and exhaust air within the tunnel. The existing internal support structures of ventilation shafts are mostly scattered steel frame splicing structures, without an integrated and linked support system. The surrounding rock of the tunnel is prone to micro-deformation, resulting in loosening of the support structure and uneven stress.

[0003] Traditional support frames often have stress concentration areas at corners, lacking self-adaptive fastening structures. Long-term pressure can easily lead to deformation and cracking, resulting in poor support stability. Furthermore, existing fans are mostly independently mounted, lacking dedicated stable installation structures. Conventional side supports rely solely on simple bolt fixation, resulting in poor integration with the inclined shaft tunnel wall, weak pull-out and vibration resistance, and difficulty in meeting the long-term, stable ventilation requirements of dual-track tunnels, posing safety hazards. Therefore, this application proposes a ventilation inclined shaft capable of supplying and exhausting air to dual-track tunnels. Summary of the Invention

[0004] The purpose of this invention is to provide a ventilation inclined shaft capable of supplying and exhausting air to a dual-track tunnel, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A ventilation inclined shaft for supplying and exhausting air to a twin-track tunnel includes an inclined shaft tunnel connected to the main tunnel of the twin-track tunnel. The inclined shaft tunnel is supported by several sets of support frame assemblies. A top support connection assembly is connected between the top walls of adjacent support frame assemblies. An axial flow fan is installed at the bottom of the top support connection assembly. A side support connection assembly is connected between the side walls of adjacent support frame assemblies. The diagonal bracing arms on both sides of the top support connection assembly are fixed to the top of the side support connection assembly. The outer end of the side support connection assembly is cast and fixed in the casting hole on the inner wall of the inclined shaft tunnel.

[0006] Preferably, the support frame assembly includes side supports supporting the two side walls of the inclined shaft tunnel, a top support connecting the tops of the two sets of side supports, and a hydraulic support and fastening assembly installed at the corner where the side supports and the top support are connected.

[0007] Preferably, the hydraulic support fastening assembly includes a right-angle fastening frame fixed at the corner of the side bracket and the top bracket, a connecting rod and a hydraulic rod movably connected to the inner walls of both ends of the right-angle fastening frame, and a hydraulic cylinder connected to the top of the connecting rod, wherein the piston at the bottom of the hydraulic rod is disposed inside the hydraulic cylinder; The right-angle fastening frame has a stiffening plate at the corner. The bottom ear plate and the top ear plate are fixed to the inner walls of both ends of the right-angle fastening frame, respectively. The bottom of the connecting rod is movably connected to the bottom ear plate by a pin, and the top of the hydraulic rod is movably connected to the top ear plate by a pin.

[0008] Preferably, a side baffle is fixed to the outer side of the side bracket, and a top baffle is fixed to the top of the top bracket. The inner walls of both the side baffle and the top baffle are provided with reinforcing ribs.

[0009] Preferably, the top support connection assembly includes an X-shaped frame fixed between the tops of adjacent support frame assemblies, several sets of reinforcing connecting seats fixed at the bottom of the X-shaped frame, and a bottom hoop plate for fixing the axial flow fan to the reinforcing connecting seats; The lower end of the reinforced connecting seat is provided with a semi-circular groove for placing an axial flow fan; The top of the diagonal brace is movably connected between adjacent reinforcing connecting seats via a pivot.

[0010] Preferably, the side support connection assembly includes side support arms that are distributed vertically and fixed between adjacent side supports, and side X-shaped fasteners that are fixed between the upper and lower side support arms by steel reinforcement skeleton members. The right-angle seat at the bottom of the diagonal brace is fixed to the top of the upper side support arm.

[0011] Preferably, the steel reinforcement cage includes a tie rod, a threaded rod provided on the inner end of the tie rod, a conical head provided on the outer end of the tie rod, and a steel reinforcement mesh frame sleeved on the outside of the tie rod and the conical head; The threaded rod passes through the end of the side X-shaped fastener and the side support arm and is then secured with a nut. The tie rod, conical head, and steel mesh are cast and fixed in the casting holes on the inner wall of the inclined shaft tunnel.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the present invention sets up multiple sets of linked support frame components, top support connection components and side support connection components to form an integrated mesh support system, which has uniform stress and high support strength.

[0013] The hydraulic support and fastening assembly at the corner of the support frame assembly of the present invention can adaptively compensate for deformation and assembly gap, continuously lock and reinforce, and prevent the structure from loosening and cracking. The top support connection component can stably assemble the axial flow fan, and form a triangular structure with the inclined brace arm. The steel skeleton of the side support connection component is cast and anchored to the inner wall of the inclined shaft tunnel, realizing the integrated consolidation of the structure and the tunnel wall, with excellent pull-out and sway resistance. The top support connection assembly connects multiple support frame assemblies into a whole through an X-shaped frame, improving the overall integrity and deformation resistance of the inclined shaft tunnel top support. Reinforced connecting seats, semi-circular grooves, and bottom clamps ensure precise positioning and stable installation of the axial flow fan, preventing operational swaying. The inclined bracing arm, together with the rotating shaft and tunnel sidewall, forms a triangular stabilizing structure, achieving force linkage between the top and side structures (top support connection assembly and side support connection assembly), integrating the functions of tunnel support reinforcement and stable fan installation. The side support connection assembly strengthens the tunnel sidewall support through double-layer side support arms and side X-shaped fasteners, dispersing lateral rock pressure. The steel skeleton, composed of tie rods, conical heads, and a steel mesh, is cast and anchored to the inclined shaft tunnel wall. This structure exhibits strong pull-out and sway resistance, evenly distributing the stress of the support system to the surrounding rock, effectively preventing structural loosening and displacement, and ensuring the long-term stable service of the overall support structure. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a schematic diagram of the overall connection of the support frame assembly, the top support connection assembly, the axial flow fan, and the side support connection assembly of the present invention. Figure 3 This is an exploded structural diagram of the support frame assembly of the present invention; Figure 4 This is a three-dimensional structural diagram of the support frame assembly of the present invention; Figure 5 This is a schematic diagram of the hydraulic support and fastening assembly of the present invention; Figure 6 For the present invention Figure 4 A schematic diagram of the cross-sectional structure; Figure 7 This is an exploded structural diagram of the top support connection assembly, side support connection assembly and axial flow fan assembly of the present invention; Figure 8 This is an exploded structural diagram of the side support connection component of the present invention; Figure 9 This is a schematic diagram of the overall structure of the top support connection assembly, the side support connection assembly, and the axial flow fan assembly of the present invention; Figure 10 This is a schematic diagram of the structure in which adjacent support frame components of the present invention are connected and fixed by a top support connection component and a side support connection component.

[0015] In the diagram: 1. Inclined shaft tunnel; 2. Support frame assembly; 201. Side support; 202. Top support; 203. Top baffle; 204. Side baffle; 205. Hydraulic support fastening assembly; 2051. Right-angle fastening frame; 2052. Rib plate; 2053. Bottom ear plate; 2054. Connecting rod; 2055. Hydraulic cylinder; 2056. Hydraulic rod; 2057. Top ear plate; 3. Top support connection Components; 301, X-shaped frame; 302, reinforced connecting seat; 303, semi-circular groove; 304, diagonal brace arm; 305, rotating shaft; 306, right-angle seat; 307, bottom hoop plate; 4, side support connecting assembly; 401, tie rod; 402, conical head; 403, threaded rod; 404, steel mesh frame; 405, side X-shaped fastener; 406, side support arm; 407, nut; 5, axial flow fan. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example: Please see Figures 1-10 The present invention provides a technical solution: A ventilation inclined shaft for supplying and exhausting air to a twin-track tunnel includes an inclined shaft tunnel 1 connected to the main tunnel of the twin-track tunnel. Several sets of support frame assemblies 2 are supported inside the inclined shaft tunnel 1. A top support connecting assembly 3 is connected between the top walls of adjacent support frame assemblies 2. An axial flow fan 5 is installed at the bottom of the top support connecting assembly 3. Side support connecting assemblies 4 are connected between the side walls of adjacent support frame assemblies 2. The inclined bracing arms 304 on both sides of the top support connecting assembly 3 are fixed to the top of the side support connecting assembly 4. The outer ends of the side support connecting assembly 4 are cast and fixed in the casting holes on the inner wall of the inclined shaft tunnel 1.

[0018] The support frame assembly 2 includes side supports 201 that support the two side walls of the inclined shaft tunnel 1, a top support 202 that connects the top of the two sets of side supports 201, and a hydraulic support fastening assembly 205 installed at the corner where the side supports 201 and the top support 202 are connected.

[0019] The hydraulic support and fastening assembly 205 includes a right-angle fastening frame 2051 fixed at the corner of the side bracket 201 and the top bracket 202, a connecting rod 2054 and a hydraulic rod 2056 movably connected to the inner walls of both ends of the right-angle fastening frame 2051, and a hydraulic cylinder 2055 connected to the top of the connecting rod 2054. The piston at the bottom of the hydraulic rod 2056 is located inside the hydraulic cylinder 2055. A stiffening plate 2052 is provided at the corner of the right-angle fastening frame 2051. A bottom ear plate 2053 and a top ear plate 2057 are fixed to the inner walls of both ends of the right-angle fastening frame 2051, respectively. The bottom of the connecting rod 2054 is movably connected to the bottom ear plate 2053 by a pin, and the top of the hydraulic rod 2056 is movably connected to the top ear plate 2057 by a pin.

[0020] A side baffle 204 is fixed to the outside of the side bracket 201, and a top baffle 203 is fixed to the top of the top bracket 202. The inner walls of both the side baffle 204 and the top baffle 203 are provided with reinforcing ribs.

[0021] Support frame assembly 2 (main support frame): 1. The side support 201 and the top support 202 form a single arched support frame, which is installed in close contact with the side wall and top wall of the inclined shaft tunnel 1.

[0022] The arched structure has a reasonable stress distribution and can bear the pressure of the surrounding rock of the tunnel in all directions. A single frame can be independently supported, and multiple frames can be connected in series to form a continuous support system, which is suitable for the long-distance support needs of inclined shaft tunnels.

[0023] 2. The side baffle 204 and the top baffle 203 are fixed to the outside of the side bracket 201 and the top of the top bracket 202, respectively, and the inner wall is provided with reinforcing ribs.

[0024] Increasing the contact area between the support and the surrounding rock of the tunnel disperses local pressure, while the reinforcing ribs can significantly improve the baffle's resistance to bending and compression, preventing the support structure from being damaged by crushed rock fragments.

[0025] 3. The hydraulic support fastening component 205 is assembled at the corner of the support frame component 2 at the critical stress position, and is the core fastening adaptive structure.

[0026] 4. The right-angle structure of the right-angle fastening frame 2051 and the stiffening plate 2052 is adapted to the corner shape of the bracket, and the stiffening plate 2052 strengthens the corner strength.

[0027] Targeted reinforcement of stress-concentrated corner locations on the support structure prevents corner breakage and deformation, thereby improving the overall structural rigidity of the frame.

[0028] 5. The bottom ear plate 2053, the top ear plate 2057, the connecting rod 2054, the hydraulic rod 2056, and the hydraulic cylinder 2055 form a hydraulic hinge telescopic fastening structure.

[0029] It adopts a pin-shaft hinge connection method and is equipped with hydraulic adaptive telescopic drive, which can automatically compensate for assembly gaps and micro deformation of surrounding rock, and continuously maintain the support in a tight state without the risk of loosening. The hydraulic drive tightening force is uniform and controllable. Compared with traditional bolt tightening, it does not require manual periodic re-inspection and tightening, and is suitable for the long-term underground complex working conditions of tunnels.

[0030] The top support connection assembly 3 includes an X-shaped frame 301 fixed between the tops of adjacent support frame assemblies 2 (the X-shaped frame 301 is fixed between adjacent top supports 202), several sets of reinforcing connecting seats 302 fixed at the bottom of the X-shaped frame 301, and a bottom hoop plate 307 for fixing the axial flow fan 5 to the reinforcing connecting seats 302; the lower end of the reinforcing connecting seat 302 is provided with a semi-circular groove 303 for placing the axial flow fan 5; the top of the diagonal brace 304 is movably connected between adjacent reinforcing connecting seats 302 by a rotating shaft 305.

[0031] Top support connection component 3 (fan installation and top linkage structure): 1. The X-shaped frame 301 is fixed between adjacent top supports 202.

[0032] The X-shaped cross structure has excellent mechanical properties, strong tensile and deformation resistance, and can connect multiple independent support frame components 2 in series to form a whole, avoiding force displacement of a single support and improving the overall support uniformity.

[0033] 2. The axial flow fan 5 is assembled and fixed by the reinforcing connecting seat 302, the semi-circular groove 303, and the bottom hoop plate 307.

[0034] The semi-circular groove 303 enables precise positioning of the fan, and the bottom hoop plate 307 locks and fixes it, making the assembly stable and the disassembly and assembly convenient. It can effectively restrain the displacement of the fan during operation and prevent the fan from shaking and deviating. Multiple sets of reinforced connecting seats 302 distribute the load of the fan to prevent local structural overload and deformation.

[0035] 3. The diagonal brace 304, the pivot 305, and the right-angle seat 306 connect the X-shaped frame 301 of the top support structure to the side support structure (side support connection assembly 4).

[0036] The hinge assembly is achieved through the pivot 305, which has a certain margin for shock absorption and buffering. At the same time, the diagonal support forms a triangular stable mechanical structure, realizing the force linkage between the top support structure and the side support structure, which greatly improves the overall structure's vibration resistance performance.

[0037] The side support connection assembly 4 includes side support arms 406 that are distributed vertically and fixed between adjacent side supports 201, and side X-shaped fasteners 405 that are fixed between the upper and lower side support arms 406 by steel reinforcement skeleton members. The right-angle seat 306, which is integrally set at the bottom of the diagonal brace 304, is snap-welded to the top of the side support arm 406 above.

[0038] The steel reinforcement cage includes a tie rod 401, a threaded rod 403 provided on the inner end of the tie rod 401, a conical head 402 provided on the outer end of the tie rod 401, and a steel reinforcement mesh 404 sleeved on the outside of the tie rod 401 and the conical head 402; The threaded rod 403 passes through the end of the side X-shaped fastener 405 and the side support arm 406 and is then fastened with a nut 407; Tie rod 401, conical head 402 and steel mesh frame 404 are cast and fixed in the casting hole on the inner wall of inclined shaft tunnel 1.

[0039] Side support connection component 4 (side linkage and anchoring structure): 1. The side support arm 406 (double layer) is fixed between the adjacent side brackets 201.

[0040] The double-layer longitudinal support structure enhances the overall continuity of the side support 201, improves the support strength of the tunnel sidewall, resists the lateral pressure of the surrounding rock, and prevents the support from shifting laterally.

[0041] 2. The side X-shaped fastener 405 is assembled between the upper and lower sets of side support arms 406.

[0042] The cross-fastening structure further enhances the integrity of the side support system, disperses lateral forces, avoids uneven deformation of the single-layer support structure, and improves the stability of the side support.

[0043] 3. The steel reinforcement skeleton components (tie rod 401, conical head 402, threaded rod 403, steel reinforcement mesh 404) and nut 407 are the core of the anchoring and locking of the entire structure.

[0044] The threaded rod 403 is assembled through the body and the nut 407 is locked in place, resulting in high assembly precision and a firm connection. Tie rod 401, outer conical head 402 and steel mesh frame 404 are integrally cast in the casting hole of inclined shaft tunnel 1. They have extremely strong bonding with concrete and excellent pull-out and sway resistance. They can evenly transfer the force of the internal support system to the surrounding rock of the tunnel, realizing the integrated consolidation of the structure and the tunnel wall. Tie rod 401 ensures the overall tensile strength and eliminates the risk of structural detachment and loosening.

[0045] Specifically, when using it: Overall working principle: This invention is a special ventilation inclined shaft structure adapted to the ventilation operation of the main tunnel of a double-track tunnel. The whole relies on the inclined shaft tunnel 1 as the main ventilation channel. By arranging modular and integrated support frame components 2, top support connection components 3 and side support connection components 4 inside the inclined shaft tunnel 1, a high-strength and integral internal support skeleton is constructed, while realizing the stable suspended assembly of the axial flow fan 5.

[0046] The hydraulic support fastening component 205 enables the self-adaptive fastening and locking of the support structure, which, together with the overall steel reinforcement casting anchoring structure, forms an integral consolidation system with the wall of the inclined shaft tunnel 1.

[0047] Relying on the continuous operation of the suspended axial flow fan 5, efficient air supply and exhaust ventilation can be achieved in the main tunnel of the double-track tunnel. At the same time, the entire support structure can withstand the surrounding rock pressure of the inclined shaft tunnel 1 for a long time, eliminating the problems of tunnel deformation, cracking and structural loosening caused by fan vibration, and realizing long-term, stable and safe ventilation operation of the double-track tunnel.

[0048] 1. The principle of overall support frame forming and consolidation: After the inclined shaft tunnel 1 is constructed and formed, multiple sets of support frame components 2 are sequentially arranged along the length of the inclined shaft tunnel 1. Each set of support frame components 2 is attached to the two side walls of the tunnel by the side brackets 201 on both sides and the top bracket 202 on the top wall of the tunnel, forming an arched overall support frame, which initially realizes the support of the surrounding rock of the inclined shaft tunnel 1.

[0049] The two adjacent sets of support frame components 2 are rigidly connected at the top through the top support connection component 3 and the side walls are connected as a whole through the side support connection component 4, so that the scattered single sets of support frame components 2 are connected in series into an overall mesh support system.

[0050] Meanwhile, the outer end of the side support connection component 4 is anchored to the casting hole inside the inclined shaft tunnel 1 through the steel reinforcement skeleton, which fixes the entire internal support skeleton to the tunnel wall as one, completely solving the problems of the traditional tunnel ventilation support structure being scattered, easy to loosen, and having insufficient support strength, and providing a stable structural foundation for subsequent fan installation and long-term ventilation operations.

[0051] 2. Bracket self-adaptive hydraulic fastening principle: Hydraulic support and fastening assembly 205 is installed at the critical stress position of the corner between the side bracket 201 and the top bracket 202 in the support frame assembly 2.

[0052] During assembly, the hydraulic cylinder 2055 drives the internal piston to move the hydraulic rod 2056 in extension and retraction. The hydraulic rod 2056 pulls one end of the right-angle fastener 2051 through the top ear plate 2057, while the connecting rod 2054 forms a hinged support through the bottom ear plate 2053.

[0053] The locking force of the right-angle fastener 2051 can be adaptively adjusted by hydraulic telescopic drive, so as to tighten and limit the corner position of the support frame assembly 2 in both directions.

[0054] Relying on the adaptive compensation characteristics of the hydraulic structure, it can effectively offset the slight deformation of the surrounding rock of the tunnel, the loosening caused by assembly gaps and long-term stress, and continuously maintain the overall rigidity of the support frame assembly 2, avoiding cracking, deformation and loosening of the support corners under stress, and greatly improving the pressure-bearing stability of the entire support structure.

[0055] Meanwhile, the stiffening plate 2052 on the inner side of the right-angle fastener 2051 can strengthen the corner stress and disperse concentrated stress.

[0056] 3. The principle of suspended and fixed fan for stable ventilation: The top support connection assembly 3 is installed between the top brackets 202 of the adjacent support frame assembly 2. A high-strength top connection base is formed by the X-shaped frame 301. Multiple sets of reinforcing connection seats 302 are fixed at the bottom of the X-shaped frame 301. The axial flow fan 5 is placed in a limited position by the semi-circular groove 303 at the bottom of the reinforcing connection seat 302. The bottom hoop plate 307 is used to lock and fix the axial flow fan 5, so that the axial flow fan 5 is suspended in the middle position inside the inclined shaft tunnel 1.

[0057] Meanwhile, the diagonal bracing arms 304 on both sides of the top support connecting component 3 are hinged between the reinforcing connecting seats 302 via the pivot 305, and the bottom is fixed to the top of the side support connecting component 4 via the right angle seat 306, forming a triangular stable structure of "top horizontal support and side diagonal reinforcement", which effectively counteracts the continuous vibration generated by the high-speed operation of the axial flow fan 5 and avoids the loosening and deformation of the bracket caused by fan resonance.

[0058] When the axial flow fan 5 is running stably, it can rely on the channel structure of the inclined shaft tunnel 1 to connect the main tunnel of the double-line tunnel to realize the supply of fresh air and the discharge of polluted air to the double-line tunnel, thus completing the tunnel ventilation and air exchange operation.

[0059] 4. Principle of overall side reinforcement and tunnel wall anchoring: Between the side supports 201 of adjacent support frame assemblies 2, a vertical reinforcement structure is formed by upper and lower double-layer side support arms 406. The two layers of side support arms 406 form a cross-force system through side X-shaped fasteners 405, which strengthens the overall anti-compression ability of the side.

[0060] The side X-shaped fastener 405 and the side support arm 406 are anchored as a whole through the steel reinforcement skeleton. The threaded rod 403 of the steel reinforcement skeleton passes through the structural member and is locked and fixed by the nut 407. The outer conical head 402, the steel reinforcement mesh 404 and the tie rod 401 are integrally cast and fixed in the casting hole of the tunnel wall.

[0061] This structure can evenly transfer the force of the entire internal support frame (support frame assembly 2 and top support connection assembly 3) to the surrounding rock of the inclined shaft tunnel 1, thereby dispersing the structural force and avoiding local stress concentration. At the same time, the cast-in-place anchoring structure has extremely strong pull-out and sway resistance, ensuring the stability of the entire structure during long-term service.

[0062] The core advantages of the overall structural linkage: 1. Modular linkage: The support frame assembly 2, the top support connection assembly 3, and the side support connection assembly 4 are hinged, fixed, and linked to each other to form an "overall closed-loop mesh support system". Compared with the traditional scattered support structure, the stress is more uniform and the stability is stronger, which is suitable for the complex surrounding rock conditions of the inclined shaft tunnel 1.

[0063] 2. Strong vibration reduction adaptability: Through the triangular bracing structure, hinged pivot structure, and hydraulic adaptive fastening structure, multiple stresses of surrounding rock deformation are offset.

[0064] 3. Integrated support and ventilation: The tunnel's surrounding rock support, structural reinforcement, and stable installation of the ventilation fan are integrated into one unit, eliminating the need for additional ventilation fan supports, simplifying the construction process, reducing construction costs, and ensuring continuous, stable, and efficient ventilation operations in the dual-track tunnel.

[0065] 4. High anchoring strength: The side integral steel reinforcement skeleton is cast and anchored, so that the internal support structure is integrated with the tunnel wall. There is no risk of loosening or falling off during long-term service, which is suitable for the long-term operation and ventilation needs of the tunnel.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ventilation inclined shaft for supplying and exhausting air into a twin-track tunnel, comprising an inclined shaft tunnel connected to the main tunnel of the twin-track tunnel, characterized in that: The inclined shaft tunnel is supported by several sets of support frame assemblies. The top walls of adjacent support frame assemblies are connected by a top support connection assembly, and an axial flow fan is installed at the bottom of the top support connection assembly. A side support connection assembly is connected between the side walls of adjacent support frame assemblies. The diagonal bracing arms on both sides of the top support connection assembly are fixed to the top of the side support connection assembly. The outer end of the side support connection assembly is cast and fixed in the casting hole on the inner wall of the inclined shaft tunnel. The top support connection assembly includes an X-shaped frame fixed between the tops of adjacent support frame assemblies, several sets of reinforcing connecting seats fixed at the bottom of the X-shaped frame, and a bottom hoop plate for fixing the axial flow fan to the reinforcing connecting seats. The lower end of the reinforced connecting seat is provided with a semi-circular groove for placing an axial flow fan; The top of the diagonal brace arm is movably connected between adjacent reinforcing connecting seats via a rotating shaft; The side support connection assembly includes side support arms that are distributed vertically and fixed between adjacent side supports, and side X-shaped fasteners that are fixed between the upper and lower side support arms by steel reinforcement skeleton members. The right-angle seat at the bottom of the diagonal brace is fixed to the top of the upper side support arm.

2. A ventilation inclined shaft for supplying and exhausting air to a dual-track tunnel according to claim 1, characterized in that: The support frame assembly includes side supports supporting the two side walls of the inclined shaft tunnel, a top support connecting the tops of the two sets of side supports, and a hydraulic support and fastening assembly installed at the corner where the side supports and the top support connect.

3. A ventilation inclined shaft for supplying and exhausting air to a dual-track tunnel according to claim 2, characterized in that: The hydraulic support and fastening assembly includes a right-angle fastening frame fixed at the corner of the side bracket and the top bracket, a connecting rod and a hydraulic rod movably connected to the inner walls of both ends of the right-angle fastening frame, and a hydraulic cylinder connected to the top of the connecting rod. The piston at the bottom of the hydraulic rod is located inside the hydraulic cylinder. The right-angle fastening frame has a stiffening plate at the corner. The bottom ear plate and the top ear plate are fixed to the inner walls of both ends of the right-angle fastening frame, respectively. The bottom of the connecting rod is movably connected to the bottom ear plate by a pin, and the top of the hydraulic rod is movably connected to the top ear plate by a pin.

4. A ventilation inclined shaft for supplying and exhausting air to a dual-track tunnel according to claim 2, characterized in that: A side baffle is fixed to the outside of the side bracket, and a top baffle is fixed to the top of the top bracket. Both the side baffle and the top baffle have reinforcing ribs on their inner walls.

5. A ventilation inclined shaft for supplying and exhausting air to a dual-track tunnel according to claim 1, characterized in that: The steel reinforcement skeleton includes a tie rod, a threaded rod at the inner end of the tie rod, a conical head at the outer end of the tie rod, and a steel mesh frame fitted around the tie rod and the conical head. The threaded rod passes through the end of the side X-shaped fastener and the side support arm and is then secured with a nut. The tie rod, conical head, and steel mesh are cast and fixed in the casting holes on the inner wall of the inclined shaft tunnel.

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