Pressurizing and ventilating system for tunnel pavement construction

Abstract

The invention discloses a tunnel pavement construction pressurization ventilation system in the technical field of tunnel ventilation, and the tunnel pavement construction pressurization ventilation system comprises a fan and a rack, and the fan is arranged in the rack; air pipes are arranged on the front side and the rear side of the rack, and the air pipe on the front side is attached to an air outlet of the fan; the air pipe is provided with a butt joint mechanism, and the butt joint mechanism is used for enabling the air pipe to be rapidly and stably in butt joint with the other air pipe and meanwhile convenient to disassemble. A moving mechanism is arranged on the air pipe and used for driving the air pipe to move forwards when the ventilation distance needs to be increased. A driving mechanism is arranged on the rack, and the driving mechanism is used for driving the moving mechanisms on all the mutually connected air pipes to operate synchronously after the new air pipe is in butt joint with the air pipe in front of the fan; according to the device, a plurality of air pipes can be quickly butted, the butted air pipes are convenient to disassemble, and the workload of workers can be effectively reduced when the air pipes are assembled and disassembled.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel ventilation, and in particular to a tunnel pavement construction pressurized ventilation system. Background Art

[0002] When digging a tunnel, the air deep in the tunnel is not circulating, the oxygen is thin, and harmful substances and dust accumulate together, which will seriously affect the health of the construction workers. Therefore, during tunnel construction, fans are usually set up outside the tunnel, and then the air ducts are extended into the construction position in the tunnel. Through the fans and air ducts, fresh air from the outside can be brought into the construction position in the tunnel. After entering the tunnel, the air will expel the dust and other harmful air in the tunnel, thereby providing a better working environment for the construction workers.

[0003] However, as the length of the tunnel increases, the length of the air duct also needs to increase accordingly. Existing air ducts are usually connected by bolts. Since the diameter of the air duct is usually large, a large number of bolts are required, which makes the connection operation more complicated and the disassembly more troublesome. In addition, when the existing air duct is extended, the new air duct is usually moved from outside the tunnel to inside the tunnel, and then the new air duct is connected with the air duct inside the tunnel to achieve the effect of extending the air duct. However, as the length of the tunnel increases, the distance the air duct is moved will also increase, making it time-consuming and labor-intensive to move. Summary of the invention

[0004] The object of the present invention is to provide a tunnel pavement construction pressurized ventilation system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a tunnel pavement construction pressurized ventilation system, comprising a fan and a frame, wherein the fan is arranged inside the frame; air ducts are arranged at both the front and rear sides of the frame, and the air ducts at the front side are in contact with the air outlet of the fan; The air duct is provided with a docking mechanism, which is used to enable the air duct to be quickly and stably docked with another air duct while being easy to disassemble; The frame is provided with an adding mechanism, which is used to move the air duct located behind the fan to a position where it is docked with the air duct in front of the fan when the ventilation distance needs to be increased; The air duct is provided with a moving mechanism, and the moving mechanism is used to drive the air duct to move forward when the ventilation distance needs to be increased; The frame is provided with a driving mechanism, and the driving mechanism is used to drive the moving mechanisms on all the interconnected air ducts to operate synchronously after the new air duct is docked with the air duct in front of the fan.

[0006] Preferably, the docking mechanism includes a fixed sleeve, which is arranged on the surface of the air duct and fixedly connected to the air duct; a fixed ring is fixedly connected to the fixed sleeve, a rotating ring is rotatably connected to the rear of the fixed ring, and a plurality of fixed rods are fixedly connected to the rotating ring; a plurality of springs are provided on the rotating ring, one end of the spring is fixedly connected to the rotating ring and the other end is fixedly connected to the fixed ring; a plurality of clamping blocks are fixedly connected to the front end of the air duct, the number of the clamping blocks is the same as the number of the fixed rods and the plurality of clamping blocks are respectively located directly in front of the plurality of fixed rods.

[0007] Preferably, the plurality of fixing rods and the plurality of springs are distributed on the rotating ring in a circular array; and a pulling rod is fixedly connected to the rotating ring at a position between two adjacent springs.

[0008] Preferably, the adding mechanism includes two first clamping plates, the two first clamping plates are located at the rear position of the fan and are symmetrically distributed on the left and right sides of the frame, and the first clamping plates are slidably connected to the frame; cylinders are symmetrically arranged at the left and right sides above the fan, the upper ends of the cylinders are fixedly connected to the frame and the bottom ends are fixedly connected to the fan; the fan is slidably connected to the frame and the left and right ends of the fan are symmetrically rotatably connected with connecting rods, the rear end part of the connecting rods is rotatably connected with a sliding frame, the sliding frame is slidably connected to the frame and the first clamping plates are located inside the sliding frame; the second clamping plates are symmetrically fixedly connected to the left and right sides in front of the frame.

[0009] Preferably, the first clamping plate and the second clamping plate are both electrically driven, the first clamping plate is clamped and connected to a fixed sleeve on the air duct behind the fan, and the second clamping plate is clamped and connected to a fixed sleeve on the air duct in front of the fan.

[0010] Preferably, the moving mechanism includes a support frame, which is located at the bottom of the fixed sleeve and is fixedly connected to the fixed sleeve; the bottom of the support frame is rotatably connected to a driving shaft, and rollers are symmetrically fixedly connected to the left and right ends of the driving shaft; the middle of the support frame is rotatably connected to a worm, the bottom of the worm is meshed with a worm wheel, and the worm wheel is fixedly connected to the driving shaft; the front and rear ends of the worm are respectively fixedly connected to a first docking shaft and a second docking shaft.

[0011] Preferably, the support frame is height-adjustable; the front end of the first docking shaft is in the shape of a rectangular rod and the rear end of the second docking shaft is in the shape of a rectangular groove.

[0012] Preferably, the driving mechanism includes a fixed frame, the fixed frame is fixedly connected to the frame and a first motor is fixedly connected to the fixed frame, the left and right ends of the output shaft of the first motor are symmetrically fixedly connected to wire wheels, a pull rope is wound around the wire wheel and the pull rope is fixedly connected to the wire wheel; a lifting frame is provided at the bottom of the first motor, the left and right ends of the lifting frame are slidably connected to the frame and a telescopic rod is fixedly connected to the lifting frame, the telescopic end of the telescopic rod is fixedly connected to a fixed frame, a second motor is fixedly connected in the fixed frame, and a third docking shaft is fixedly connected to the front end of the output shaft of the second motor; guide wheels are symmetrically fixedly connected to the left and right sides of the lifting frame, the bottom end of the pull rope is fixedly connected to the fixed frame and the pull rope is in contact with the guide wheel.

[0013] Preferably, the shape of the front end portion of the third docking shaft is the same as that of the first docking shaft; and the telescopic rod is elastic.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds a new air duct to the docking position of the air duct in front of the fan through an adding mechanism, and then docks it with the air duct in front of the fan through the docking mechanism, and then starts the driving mechanism, which drives the moving mechanisms on all the air ducts to operate synchronously, and multiple moving mechanisms will drive multiple air ducts to move forward synchronously a distance of the length of the air duct. At this time, the newly docked air duct is in the front position of the fan, and the fan is driven to move downward, so that the air outlet of the fan will dock with the newly docked air duct, and then the fan can be started to ventilate the tunnel again; the device can quickly dock with multiple air ducts and the docked air ducts are easy to disassemble, which can effectively reduce the workload of the staff when installing and disassembling the air ducts.

[0015] The present invention connects the air ducts outside the tunnel. Compared with the traditional method of connecting the air ducts inside the tunnel, the process of carrying the air ducts into the tunnel can be omitted, and the workload of the staff can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the rear view in the present invention; Figure 3 It is a schematic diagram of the split structure of the present invention; Figure 4 It is a structural schematic diagram of the air duct in the present invention; Figure 5 It is a schematic diagram of the structure of the air duct in the present invention from a second viewing angle; Figure 6 It is a structural schematic diagram of the frame in the present invention; Figure 7 It is a schematic diagram of the split structure of the rack in the present invention; Figure 8 It is a structural schematic diagram of the driving mechanism in the present invention.

[0017] In the attached drawings: 1. fan; 2. frame; 3. air duct; 4. fixing sleeve; 5. fixing ring; 6. rotating ring; 7. fixing rod; 8. spring; 9. block; 10. pulling rod; 11. first clamping plate; 12. cylinder; 13. connecting rod; 14. sliding frame; 15. second clamping plate; 16. supporting frame; 17. driving shaft; 18. roller; 19. worm; 20. worm wheel; 21. first docking shaft; 22. second docking shaft; 23. fixing frame; 24. first motor; 25. wire pulley; 26. pull rope; 27. lifting frame; 28. telescopic rod; 29. ​​fixing frame; 30. second motor; 31. third docking shaft; 32. guide wheel. DETAILED DESCRIPTION

[0018] See also Figure 1-Figure 8 The present invention provides a technical solution: a tunnel pavement construction pressurized ventilation system, comprising a fan 1 and a frame 2, wherein the fan 1 is arranged inside the frame 2; air ducts 3 are arranged at both the front and rear sides of the frame 2, and the front air duct 3 is in contact with the air outlet of the fan 1; The air duct 3 is provided with a docking mechanism, which is used to quickly and stably dock the air duct 3 with another air duct 3 and facilitate disassembly; The rack 2 is provided with an adding mechanism, which is used to move the air duct 3 located behind the fan 1 to a position where it docks with the air duct 3 in front of the fan 1 when the ventilation distance needs to be increased; The air duct 3 is provided with a moving mechanism, which is used to drive the air duct 3 to move forward when the ventilation distance needs to be increased; The frame 2 is provided with a driving mechanism, which is used to drive the moving mechanisms on all the interconnected air ducts 3 to operate synchronously after the new air duct 3 is docked with the air duct 3 in front of the fan 1; During operation, after the tunnel construction reaches a certain depth, the frame 2 is fixed at the tunnel entrance, and then a certain number of air ducts 3 are quickly docked together through the docking mechanism, and the rearmost air duct 3 of this part is docked with the air outlet of the fan 1, and the rest of the part is extended into the tunnel. At this time, the fan 1 is turned on, and the fan 1 extracts the outside air and transports it to the depth of the tunnel through multiple air ducts 3. The wind pressure in the depth of the tunnel increases, squeezing the air in the tunnel outward, and the dust, harmful gases and other fine particles in the tunnel will be discharged from the tunnel, thereby providing a good working environment for tunnel construction workers; With the construction of the tunnel, the length of the tunnel will continue to increase. In order to ensure the ventilation effect of the tunnel, when the length of the tunnel increases, the fan 1 is stopped first, and a new air duct 3 is added to the docking position of the air duct 3 in front of the fan 1 through the adding mechanism, and then docked with the air duct 3 in front of the fan 1 through the docking mechanism, and then the driving mechanism is started. The driving mechanism drives the moving mechanisms on all the air ducts 3 to run synchronously, and multiple moving mechanisms will drive multiple air ducts 3 to move forward synchronously by the length of a air duct 3. At this time, the newly docked air duct 3 is in the front position of the fan 1. By driving the fan 1 to move downward, the air outlet of the fan 1 will dock with the newly docked air duct 3, and then the fan 1 can be started to ventilate the tunnel again; the device can quickly dock multiple air ducts 3 and the docked air duct 3 is easy to disassemble, which can effectively reduce the workload of the staff when installing and disassembling the air duct 3; in addition, by docking the air duct 3 outside the tunnel, compared with the traditional method of docking the air duct 3 inside the tunnel, the process of transporting the air duct 3 to the tunnel can be omitted, which can further reduce the workload of the staff.

[0019] like Figure 4-Figure 5 As shown, as a further solution of the present invention, the docking mechanism includes a fixing sleeve 4, which is sleeved on the surface of the air duct 3 and fixedly connected to the air duct 3; a fixing ring 5 is fixedly connected to the fixing sleeve 4, a rotating ring 6 is rotatably connected to the rear of the fixing ring 5, and a plurality of fixing rods 7 are fixedly connected to the rotating ring 6; a plurality of springs 8 are provided on the rotating ring 6, one end of the spring 8 is fixedly connected to the rotating ring 6 and the other end is fixedly connected to the fixing ring 5; a plurality of clamping blocks 9 are fixedly connected to the front end of the air duct 3, the number of the clamping blocks 9 is the same as the number of the fixing rods 7, and the plurality of clamping blocks 9 are respectively located in front of the plurality of fixing rods 7; A plurality of fixed rods 7 and a plurality of springs 8 are distributed on the rotating ring 6 in a circular array; a trigger rod 10 is fixedly connected to the rotating ring 6 between two adjacent springs 8; During operation, when the new air duct 3 is moved forward to dock with the rear air duct 3, the multiple clamping blocks 9 on the new air duct 3 will fit with the multiple fixing rods 7 on the rear air duct 3. As the new air duct 3 continues to move forward, the clamping blocks 9 will begin to squeeze the fixing rods 7, and the multiple fixing rods 7 will drive the rotating ring 6 to start rotating on the fixing ring 5. When the new air duct 3 is tightly docked with the rear air duct 3, the clamping blocks 9 on the new air duct 3 will pass over the fixing rods 7 on the rear air duct 3. The rotating ring 6 automatically resets under the action of multiple springs 8, and the rotating ring 6 drives the multiple fixed rods 7 to reset. The multiple fixed rods 7 are engaged with the multiple blocking blocks 9. The new air duct 3 is now stably connected to the rear air duct 3; when the air duct 3 needs to be disassembled, the rotating ring 6 can be turned in the opposite direction by turning the lever 10. When the rotating ring 6 rotates, it will drive the multiple fixed rods 7 to rotate with the rotating ring 6. When the multiple fixed rods 7 rotate with the rotating ring 6, they will disengage from the blocking blocks 9. At this time, the two stably connected air ducts 3 can be disassembled.

[0020] like Figure 6-Figure 7 As shown, as a further solution of the present invention, the adding mechanism includes two first clamping plates 11, the two first clamping plates 11 are located at the rear position of the fan 1 and are symmetrically distributed on the left and right sides of the frame 2, and the first clamping plates 11 are slidably connected to the frame 2; cylinders 12 are symmetrically arranged at the left and right sides above the fan 1, the upper end of the cylinder 12 is fixedly connected to the frame 2 and the bottom end is fixedly connected to the fan 1; the fan 1 is slidably connected to the frame 2 and the left and right ends of the fan 1 are symmetrically rotatably connected with connecting rods 13, the rear end part of the connecting rod 13 is rotatably connected with a sliding frame 14, the sliding frame 14 is slidably connected to the frame 2 and the first clamping plates 11 are located inside the sliding frame 14; the second clamping plates 15 are symmetrically fixedly connected to the left and right sides in front of the frame 2; The first clamping plate 11 and the second clamping plate 15 are both electrically driven, the first clamping plate 11 is clamped and connected to the fixing sleeve 4 on the air duct 3 behind the fan 1, and the second clamping plate 15 is clamped and connected to the fixing sleeve 4 on the air duct 3 in front of the fan 1; During operation, the air duct 3 in front of the fan 1 can be firmly fixed by the two second clamping plates 15, and the fan 1 can supply air to the air duct 3 when it is in the position of docking with the air duct 3; when a new air duct 3 needs to be added, the fan 1 is driven to move upward by starting the two cylinders 12, and when the fan 1 moves upward, the two sliding frames 14 are driven to move forward respectively through the two connecting rods 13; when the fan 1 moves upward to the upper position of the air duct 3, the rear inner wall of the sliding frame 14 will fit with the first clamping plate 11, and as the fan 1 continues to move upward, the sliding frame 14 will drive the first clamping plate 11 to move forward at this time, and since the two first clamping plates 11 clamp the new air duct 3, when the two first clamping plates 11 move forward, the new air duct 3 will also move forward and finally dock with the air duct 3 in front of the fan 1.

[0021] like Figure 4-Figure 5 As shown, as a further solution of the present invention, the moving mechanism includes a support frame 16, the support frame 16 is located at the bottom of the fixed sleeve 4 and the support frame 16 is fixedly connected to the fixed sleeve 4; the bottom of the support frame 16 is rotatably connected to a driving shaft 17, and the left and right ends of the driving shaft 17 are symmetrically fixedly connected to rollers 18; the middle of the support frame 16 is rotatably connected to a worm 19, the bottom of the worm 19 is meshed with a worm wheel 20, and the worm wheel 20 is fixedly connected to the driving shaft 17; the front and rear ends of the worm 19 are respectively fixedly connected to a first docking shaft 21 and a second docking shaft 22; The support frame 16 is height-adjustable; the front end of the first docking shaft 21 is in the shape of a rectangular rod and the rear end of the second docking shaft 22 is in the shape of a rectangular groove; During operation, when the two air ducts 3 are connected, the first connecting shaft 21 on the rear air duct 3 will be inserted into the second connecting shaft 22 on the front air duct 3. After the first connecting shaft 21 and the second connecting shaft 22 are connected, it is only necessary to drive the second connecting shaft 22 on the rear air duct 3 to drive the worm 19 on the front and rear air ducts 3 to rotate. When the worm 19 rotates, it drives the worm wheel 20 to rotate. The worm wheel 20 drives the two rollers 18 to rotate through the driving shaft 17. When the rollers 18 on the front and rear air ducts 3 rotate, the front and rear air ducts 3 will move forward or backward synchronously.

[0022] As shown in FIG8 , as a further solution of the present invention, the driving mechanism includes a fixed frame 23, the fixed frame 23 is fixedly connected to the frame 2 and a first motor 24 is fixedly connected to the fixed frame 23, the left and right ends of the output shaft of the first motor 24 are symmetrically fixedly connected to wire wheels 25, a pull rope 26 is wound around the wire wheel 25 and the pull rope 26 is fixedly connected to the wire wheel 25; a lifting frame 27 is provided at the bottom of the first motor 24, the left and right ends of the lifting frame 27 are slidably connected to the frame 2 and a telescopic rod 28 is fixedly connected to the lifting frame 27, the telescopic end of the telescopic rod 28 is fixedly connected to a fixed frame 29, a second motor 30 is fixedly connected in the fixed frame 29, and a third docking shaft 31 is fixedly connected to the front end of the output shaft of the second motor 30; guide wheels 32 are symmetrically fixedly connected to the left and right sides of the lifting frame 27, the bottom end of the pull rope 26 is fixedly connected to the fixed frame 29 and the pull rope 26 fits the guide wheel 32; The shape of the front end of the third docking shaft 31 is the same as that of the first docking shaft 21; the telescopic rod 28 is elastic; During operation, when the fan 1 moves to the uppermost position in the frame 2, the new air duct 3 behind the fan 1 will move forward and dock with the air duct 3 in front of the fan 1. At this time, the two first clamping plates 11 and the two second clamping plates 15 are loosened, and then the first motor 24 is started. The first motor 24 drives the wire wheels 25 on the left and right sides to rotate. When the wire wheels 25 rotate, the pull rope 26 is released. At this time, the lifting frame 27 drives the telescopic rod 28 and the second motor 30 to move downward; when the lifting frame 27 moves to the bottommost position, the third docking shaft 31 on the second motor 30 is at the same height as the second docking shaft 22; as the wire wheel 25 continues to rotate, the pull rope 26 is released, and the second motor 30 is pushed forward under the action of the elastic force of the telescopic rod 28. When the second motor 30 drives the third docking shaft 31 to dock with the second docking shaft 22, the second motor 30 is started at this time. The second motor 30 will drive the rearmost second docking shaft 22 to rotate through the third docking shaft 31; all the rollers 18 start to rotate and drive all the air ducts 3 to move forward synchronously, and the second motor 30 will also move forward with the air duct 3 under the action of the telescopic rod 28; when the rearmost air duct 3 moves to the front position of the fan 1, the second motor 30 is stopped and the first motor 24 is driven to run in the reverse direction, the wire wheel 25 starts to retract the pull rope 26, the telescopic rod 28 starts to shrink and starts to move upward after shrinking to the minimum extent; at the same time, the two second clamping plates 15 are started to clamp the air duct 3 moved to the front of the fan 1, and after the air duct 3 moved to the front position of the fan 1 is clamped, the cylinder 12 is started to drive the fan 1 to move downward and reset, and when the fan 1 moves to the lowest position, it just fits with the air duct 3, and then the fan 1 can be started to continue ventilating the tunnel.

Claims

1. A tunnel pavement construction pressurized ventilation system, comprising a fan (1) and a frame (2), characterized in that: The fan (1) is arranged inside the frame (2); air ducts (3) are arranged at both the front and rear sides of the frame (2), and the air duct (3) at the front side is in contact with the air outlet of the fan (1); The air duct (3) is provided with a docking mechanism, and the docking mechanism is used to enable the air duct (3) to be quickly and stably docked with another air duct (3) while being easy to disassemble; The frame (2) is provided with an adding mechanism, and the adding mechanism is used to move the air duct (3) located behind the fan (1) to a position where it is connected to the air duct (3) in front of the fan (1) when the ventilation distance needs to be increased; The air duct (3) is provided with a moving mechanism, and the moving mechanism is used to drive the air duct (3) to move forward when the ventilation distance needs to be increased; The frame (2) is provided with a driving mechanism, which is used to drive the moving mechanisms on all interconnected air ducts (3) to operate synchronously after the new air duct (3) is docked with the air duct (3) in front of the fan (1).

2. According to claim 1, a tunnel pavement construction pressurized ventilation system is characterized by: The docking mechanism comprises a fixing sleeve (4), the fixing sleeve (4) being sleeved on the surface of the air duct (3) and fixedly connected to the air duct (3); a fixing ring (5) being fixedly connected to the fixing sleeve (4), a rotating ring (6) being rotatably connected to the rear of the fixing ring (5), and a plurality of fixing rods (7) being fixedly connected to the rotating ring (6); a plurality of springs (8) being provided on the rotating ring (6), one end of the spring (8) being fixedly connected to the rotating ring (6) and the other end being fixedly connected to the fixing ring (5); a plurality of clamping blocks (9) being fixedly connected to the front end of the air duct (3), the number of the clamping blocks (9) being the same as the number of the fixing rods (7), and the plurality of clamping blocks (9) being respectively located in front of the plurality of fixing rods (7).

3. A tunnel pavement construction pressurized ventilation system according to claim 2, characterized in that: The plurality of fixed rods (7) and the plurality of springs (8) are distributed on the rotating ring (6) in a circular array; a trigger rod (10) is fixedly connected to a position between two adjacent springs (8) on the rotating ring (6).

4. A tunnel pavement construction pressurized ventilation system according to claim 2, characterized in that: The adding mechanism comprises two first clamping plates (11), the two first clamping plates (11) are located at the rear of the fan (1) and are symmetrically distributed on the left and right sides of the frame (2), and the first clamping plates (11) are slidably connected to the frame (2); cylinders (12) are symmetrically provided at the left and right sides above the fan (1), the upper end of the cylinder (12) is fixedly connected to the frame (2) and the bottom end is fixedly connected to the fan (1); the fan (1) is slidably connected to the frame (2) and the left and right ends of the fan (1) are symmetrically rotatably connected to connecting rods (13), the rear end of the connecting rod (13) is rotatably connected to a sliding frame (14), the sliding frame (14) is slidably connected to the frame (2) and the first clamping plates (11) are located inside the sliding frame (14); and second clamping plates (15) are symmetrically fixedly connected to the left and right sides in front of the frame (2).

5. A tunnel pavement construction pressurized ventilation system according to claim 4, characterized in that: The first clamping plate (11) and the second clamping plate (15) are both electrically driven; the first clamping plate (11) is clamped and connected to a fixing sleeve (4) on the air duct (3) behind the fan (1), and the second clamping plate (15) is clamped and connected to a fixing sleeve (4) on the air duct (3) in front of the fan (1).

6. A tunnel pavement construction pressurized ventilation system according to claim 2, characterized in that: The moving mechanism comprises a support frame (16), the support frame (16) being located at the bottom of the fixed sleeve (4) and the support frame (16) being fixedly connected to the fixed sleeve (4); the bottom of the support frame (16) being rotatably connected to a driving shaft (17), and the left and right ends of the driving shaft (17) being symmetrically fixedly connected to rollers (18); the middle of the support frame (16) being rotatably connected to a worm (19), the bottom of the worm (19) being meshed with a worm wheel (20), and the worm wheel (20) being fixedly connected to the driving shaft (17); and the front and rear ends of the worm (19) being respectively fixedly connected to a first docking shaft (21) and a second docking shaft (22).

7. A tunnel pavement construction pressurized ventilation system according to claim 6, characterized in that: The support frame (16) is height-adjustable; the front end of the first docking shaft (21) is in the shape of a rectangular rod and the rear end of the second docking shaft (22) is in the shape of a rectangular groove.

8. A tunnel pavement construction pressurized ventilation system according to claim 6, characterized in that: The driving mechanism comprises a fixed frame (23), the fixed frame (23) being fixedly connected to the frame (2) and a first motor (24) being fixedly connected to the fixed frame (23), a wire wheel (25) being symmetrically fixedly connected to the left and right ends of an output shaft of the first motor (24), a pull rope (26) being wound around the wire wheel (25), and the pull rope (26) being fixedly connected to the wire wheel (25); a lifting frame (27) is provided at the bottom of the first motor (24), and the left and right ends of the lifting frame (27) are slidably connected to the frame (2). A telescopic rod (28) is fixedly connected to the lifting frame (27); a telescopic end of the telescopic rod (28) is fixedly connected to a fixing frame (29); a second motor (30) is fixedly connected inside the fixing frame (29); a front end of an output shaft of the second motor (30) is fixedly connected to a third docking shaft (31); guide wheels (32) are symmetrically fixedly connected to the left and right sides of the lifting frame (27); a bottom end of the pull rope (26) is fixedly connected to the fixing frame (29), and the pull rope (26) fits the guide wheel (32).

9. A tunnel pavement construction pressurized ventilation system according to claim 8, characterized in that: The shape of the front end portion of the third docking shaft (31) is the same as that of the first docking shaft (21); and the telescopic rod (28) is elastic.

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