Simulation experiment platform for tunnel fire under comprehensive effect of vertical shaft and ventilation

Abstract

The utility model discloses a tunnel fire simulation experiment platform under a vertical shaft and ventilation comprehensive effect. The tunnel fire simulation experiment platform comprises an experiment tunnel, the longitudinal end of the experiment tunnel is provided with an axial flow fan used for simulating different wind speeds, the upper end of the experiment tunnel is provided with a longitudinally-arranged strip-shaped opening, and the interior of the experiment tunnel is provided with a static or moving combustor and an experiment trolley; the multiple top plate pieces are laid at the strip-shaped opening side by side and seal the strip-shaped opening, and each top plate piece can be rotationally switched from the horizontal direction to the vertical direction; after a pair of adjacent top plate pieces rotate to be in a vertical state, the top plate pieces and a pair of transversely-arranged partition plates form a vertical shaft for ventilation, and an opening formed by rotation of one top plate piece is laid through a base plate. The tunnel fire simulation device realizes tunnel fire simulation under the comprehensive effect of the vertical shaft and ventilation, is convenient to adjust the position, number and opening size parameters of the vertical shaft, and is suitable for different experiment requirements.

Description

Technical Field

[0001] The invention relates to a tunnel simulation experiment, belonging to the technical field of fire safety, and in particular to a tunnel fire simulation experiment platform under the comprehensive effect of a shaft and ventilation. Background Art

[0002] The construction of tunnels can effectively shorten the distance, ease traffic congestion, and improve transportation efficiency. However, due to its relatively narrow and long closed structure, once a fire occurs, it is very easy to cause large-scale casualties and property losses. Therefore, conducting fire simulation experiments in tunnels is an important way to reduce the occurrence of tunnel fires and reduce the impact of fires.

[0003] Vertical smoke exhaust is an important ventilation and smoke exhaust method. That is, after a fire occurs in a tunnel, the smoke generated by the burning fire source will hit the ceiling and flow along the tunnel longitudinally. When it encounters the vertical shaft set above the ceiling, it will produce a chimney effect and then be discharged from the vertical shaft. After the vertical shaft discharges part of the smoke in the tunnel, the temperature of the smoke layer downstream of the vertical shaft will decrease, and the diffusion speed of the smoke downstream will also decrease, which is conducive to the safe evacuation of personnel.

[0004] There are relatively few studies on the comprehensive smoke exhaust effect of existing vertical shafts and longitudinal ventilation, and the control parameter variables are relatively single, and it is not possible to flexibly adjust multiple parameter variables such as vertical shaft characteristic parameters, blocking characteristic parameters, and fire source location at the same time. For example, the Chinese invention patent with application number CN201210189640.2: an underground highway tunnel fire experimental simulation device using vertical shaft natural smoke exhaust, its public technical solution is: side walls 2 composed of fireproof panels, ceiling, bottom plate and side walls 5 composed of glass, a vertical shaft is arranged above the ceiling, and fuel and fire source 4 are arranged in the tunnel. Although it can simulate the combustion conditions of tunnel fires in the laboratory and study the smoke flow laws during highway tunnel fires using vertical shaft natural smoke exhaust, it cannot effectively control the vertical shaft position, number and vertical shaft spacing, or the fire source location (horizontal and vertical) and other multi-parameter tunnel fire simulations during use. Summary of the invention

[0005] The utility model aims to provide a tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation, realize tunnel fire simulation under the comprehensive effect of shaft and ventilation, and facilitate the adjustment of shaft position, number, opening size parameters, which is suitable for different experimental needs.

[0006] To achieve the above purpose, the tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation includes:

[0007] The experimental tunnel has an axial flow fan at the longitudinal end for simulating different wind speeds, a longitudinally arranged strip opening at the upper end, and a stationary or moving burner and an experimental trolley inside;

[0008] A plurality of top plate members are laid side by side at the strip-shaped opening and close the strip-shaped opening, and each top plate member can be rotated and switched from horizontal to vertical direction;

[0009] After a pair of adjacent top plate members are rotated to a vertical state, they form a ventilation shaft with a pair of transversely arranged partitions, and an opening formed by the rotation of one of the top plate members is paved with a pad.

[0010] Furthermore, the top plate member includes a single top plate body and a plurality of support blocks in a cross-shaped structure;

[0011] The support block can support the pad and the partition.

[0012] Furthermore, support slide grooves are provided on both lateral sides of the strip-shaped opening;

[0013] The lower end of the supporting slide groove is closer to the center of the strip opening than the upper end. When the top plate is in a horizontal state, the lower end of the supporting slide groove supports the top plate.

[0014] Both sides of the center of the cross-shaped structure are provided with support shafts which are arranged transversely and movably located in the support slide grooves.

[0015] Furthermore, the support shaft is provided with a pair of symmetrically arranged cutouts;

[0016] When the top plate is in a horizontal state, the cutout is parallel to the upper and lower sides of the support slide groove; when the top plate is in a vertical state, the peripheral side of the support shaft squeezes and limits the support slide groove.

[0017] In some embodiments, the partition is an L-shaped structure, and a groove is provided at the lower end;

[0018] A telescopic plate closing the lateral side of the strip-shaped opening is moved in the groove.

[0019] In some embodiments, the upper end of the partition plate is connected to the top plate by a connecting member;

[0020] The connecting piece is provided with a T-shaped groove which matches the thickness of the partition plate and the top plate.

[0021] Furthermore, the connecting member is an elastic member, and is squeezed to fix the partition and the top plate together; or

[0022] The connecting piece is provided with a plurality of threaded holes, and bolts are threadedly installed in the threaded holes to fix the partition plate and the top plate piece together through a top pressing action.

[0023] In some embodiments, an expansion plate extends upward along the contour of the upper end of the shaft.

[0024] In some embodiments, a plurality of first slide rails and second slide rails crisscrossing each other are provided on the bottom plate of the experimental tunnel;

[0025] The lower end of the burner and the experimental trolley slides in the first slide rail or the second slide rail.

[0026] Furthermore, it also includes a driving component for driving the experimental trolley and the burner in the experimental tunnel;

[0027] The driving component comprises a traction rope and a driving motor;

[0028] One end of the traction rope is connected to one end side of the experimental trolley or the burner, and the other end is longitudinally or transversely wound around the outside of a plurality of rollers and then connected to the other end side of the experimental trolley or the burner;

[0029] The driving motor is connected to one of the rollers to drive the traction rope to perform traction action.

[0030] Compared with the prior art, the tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation has multiple top plates laid side by side at the strip opening, and after a pair of adjacent top plates are rotated to a vertical state, a ventilation shaft is formed with a pair of transversely arranged partitions. Therefore, the number and position of the shafts can be determined according to the experimental requirements, and the position of the partitions determines the opening size of the shafts, so as to realize the tunnel fire simulation under the comprehensive effect of shaft and ventilation, and facilitate the adjustment of the shaft characteristic parameters, which is suitable for different experimental requirements.

[0031] The burner and the experimental trolley are matched with the first slide rail or the second slide rail through a slider to adjust their positions in the experimental tunnel, thereby realizing the simulation of different fire source positions of the fire, and the burner can be stationary or moving to simulate fires under different conditions. Different types of experimental trolleys can be made to be stationary or moving, so as to realize the precise control of the blockage position, blockage ratio and blockage number under the comprehensive effect of the shaft and ventilation, and facilitate the quantitative analysis of the smoke flow law and temperature field distribution during tunnel fires under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the overall front view of the utility model;

[0033] Figure 2 It is an overall schematic diagram of the utility model;

[0034] Figure 3 It is a schematic diagram of the structure of the vertical shaft and part of the experimental tunnel in the utility model;

[0035] Figure 4 It is a schematic diagram of the vertical shaft structure in the utility model;

[0036] Figure 5 It is a schematic diagram of the horizontal to vertical rotation of adjacent top panels in the utility model;

[0037] Figure 6 It is a schematic diagram of the structure of the top plate in the utility model;

[0038] Figure 7 It is a partial schematic diagram of the top plate in the utility model being located on the supporting slideway;

[0039] Figure 8 It is a schematic diagram of the structure of the connecting member 33 in the utility model;

[0040] Fig. 9 This is a left view of the top plate in the utility model located in the supporting chute;

[0041] In the figure: 10, experimental tunnel, 11, support chute, 12, first slide rail, 13, second slide rail;

[0042] 20. top plate member, 21. support block, 22. top plate body, 23. support shaft, 24. cutout, 25. positioning hole;

[0043] 30. shaft, 31. partition, 32. pad, 33. connector, 34. telescopic plate, 35. T-slot;

[0044] 40, burner, 41, slider;

[0045] 50. Axial flow fan;

[0046] 61. driving motor, 62. traction rope. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] like Figures 1 to 4 As shown, the tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation includes:

[0049] The experimental tunnel 10 has an axial flow fan 50 for simulating different wind speeds at the longitudinal end, a strip opening arranged longitudinally at the upper end, and a stationary or moving burner 40 and an experimental trolley inside;

[0050] There are multiple top plate members 20, which are laid side by side at the strip-shaped opening and close it, and each top plate member 20 can be rotated and switched from horizontal to vertical direction;

[0051] After a pair of adjacent top plate members 20 are rotated to a vertical state, they form a ventilation shaft 30 with a pair of transversely arranged partitions 31, wherein an opening formed by the rotation of one of the top plate members 20 is paved by a pad 32;

[0052] Specifically, the experimental tunnel 10 is used to simulate the tunnel, which can adopt a splicing structure to match the experimental requirements of different lengths; for example, the model tunnel is composed of multiple sections, each section is 8m long, and the cross-section is a rectangle of 1.8m-1.2m. The sections of the model are connected by flanges and sealed with transparent fireproof glue. The main structure of each section of the model is a steel frame structure, the bottom plate and the top plate are made of stainless steel, and the side walls are made of fireproof glass to observe the flow of smoke;

[0053] The axial flow fan 50 adopts a variable frequency fan, and uses the variable frequency axial flow fan 50 to generate longitudinal winds of different wind speeds, which enter the experimental tunnel 10 more evenly through the fairing, so as to achieve effective regulation of the longitudinal ventilation wind speed; the burner 40 and the experimental trolley are located in the experimental tunnel 10, and are used to simulate the corresponding fire and vehicle driving state;

[0054] The top plate 20 closes the strip opening and is a 0.5m-1m rectangular steel plate. At this time, the strip opening can be 0.4m away from the end side of the experimental tunnel 10. When two adjacent top plates 20 are flipped to a vertical position, they form a simulation shaft 30 with the transversely arranged partitions 31. The position and number of the shafts 30 can be adjusted according to the experimental requirements.

[0055] When using this tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation, the number and location of shaft 30 are determined according to the experimental requirements, such as Figure 5 As shown, the adjacent top plate members 20 are rotated to a vertical position at will, for example, the top plate members 20B and C are rotated, and a vertical shaft 30 of a rectangular structure is formed between them and a pair of partitions 31, and smoke can overflow from the strip opening opened by the top plate member 20C, while the strip opening opened by the top plate member 20B is closed by the pad 32. As explained, the pad 32 can be selected as a steel plate;

[0056] The burner 40 is ignited in the test tunnel 10, which can be a hot thin solid material, used to simulate the fire burning condition in the test tunnel 10; the test vehicle can be different types of vehicles, such as cars, trucks, etc., which can be stationary or moving in the test tunnel 10, used to simulate the driving state of the vehicle in the test tunnel 10;

[0057] In addition, different numbers of thermocouples are provided in the experimental tunnel 10 to measure the temperature field distribution in the tunnel during a fire, and cameras, sheet light sources and other equipment are used to obtain the smoke flow pattern in the tunnel during a fire in real time. This is a conventional method in tunnel simulation experiments and will not be further elaborated here.

[0058] like Figure 5 , Figure 6 As shown, in some embodiments, the top plate member 20 includes a single top plate body 22 and a plurality of support blocks 21 in a cross-shaped structure;

[0059] The support block 21 can support the pad 32 and the partition 31;

[0060] Specifically, the top plate member 20 is composed of three support blocks 21 and a top plate body 22. The top plate body 22 is used to close the strip opening and form the longitudinal side plate of the shaft 30. The support block 21 is used to receive the partition plate 31 or the pad plate 32.

[0061] When the top plate member 20 is a single top plate body 22, the pad 32 and the partition 31 need to have a longer horizontal length to facilitate the connection through the upper end / both sides of the strip opening of the experimental tunnel 10. There is a gap between the pad 32 and the partition 31 and the corresponding top plate member 20, and a good sealing effect cannot be achieved. When the three support blocks 21 and the top plate body 22 form a cross-shaped structure, the top plate member 20 is in a horizontal or vertical state, and can support the pad 32 and the partition 31.

[0062] like Figure 3 , Figure 6 , Figure 7 , Fig. 9 As shown, further, support slide grooves 11 are provided on both lateral sides of the strip-shaped opening;

[0063] The lower end of the support slide groove 11 is closer to the center of the strip opening than the upper end. When the top plate 20 is in a horizontal state, the lower end of the support slide groove 11 receives the top plate 20.

[0064] Both sides of the center of the cross-shaped structure are provided with support shafts 23 which are arranged transversely and movably located in the support slide grooves 11;

[0065] Specifically, the top plate member 20 is rotatably arranged by a support shaft 23, and the support shaft 23 is located in the support slide groove 11;

[0066] The lower end of the support slot 11 is closer to the center of the strip opening than the upper end, indicating that the spacing between the lower ends of a pair of support slots 11 is smaller than the spacing between their upper ends. At this time, the lateral length of the top panel 20 is taken into account, that is, the lateral length of the top panel 20 is smaller than the upper ends of a pair of support slots 11, which can ensure that the top panel 20 can rotate without conflicting with the support slots 11; the lateral length of the top panel 20 is greater than the lower ends of a pair of support slots 11, which can ensure that the top panel 20 is supported by the lower ends of the support slots 11 when it is in a horizontal arrangement.

[0067] like Figure 6 , Fig. 9 As shown, further, the support shaft 23 is provided with a pair of symmetrically arranged cutouts 24;

[0068] When the top plate 20 is in a horizontal state, the cutout 24 is parallel to the upper and lower sides of the support slot 11. When the top plate 20 is in a vertical state, the peripheral side of the support shaft 23 squeezes and limits the support slot 11.

[0069] Specifically, when the top plate 20 rotates from the horizontal to the vertical direction, the support shaft 23 rotates 90° accordingly. If the diameter of the support shaft 23 is smaller than the upper and lower widths of the support slot 11, the top plate 20 cannot be positioned in the vertical direction.

[0070] Therefore, the diameter of the support shaft 23 is larger than the upper and lower widths of the support slot 11, and is provided with a pair of cutouts 24, the distance between the pair of cutouts 24 is smaller than the upper and lower widths of the support slot 11, that is, when the top panel 20 is in a horizontal state, the cutouts 24 are parallel to the upper and lower sides of the support slot 11, and when the top panel 20 is in a vertical state, the circumferential side of the support shaft 23 gradually squeezes the support slot 11, and finally when it is in a vertical state, the squeezing force of the support shaft 23 on the support slot 11 is the largest, and at this time, the top panel 20 is positioned in the vertical direction.

[0071] like Figure 4 As shown, in some embodiments, the partition 31 is an L-shaped structure, and a groove is provided at the lower end;

[0072] A telescopic plate 34 is moved in the groove to close the lateral side of the strip-shaped opening;

[0073] Specifically, the partition 31 is used to form a side plate in the transverse direction of the shaft 30, and the telescopic plate 34 can close the strip opening;

[0074] That is, the top panel members 20B and C are rotated to form a rectangular structured vertical shaft 30 with a pair of partitions 31. The partitions 31 can be positioned according to the experimental requirements to adjust the opening size of the vertical shaft 30. After the partitions 31 are installed between the top panel members 20B and C, the telescopic plate 34 moves on the partitions 31 to close the strip opening portion opened by the top panel member 20C, especially the strip opening between the partitions 31 and the supporting slide groove 11.

[0075] like Figure 4 , Figure 8 As shown, further, the upper end of the partition 31 is connected to the top plate 20 via a connecting member 33;

[0076] The connecting member 33 is provided with a T-shaped slot 35 that matches the thickness of the partition plate 31 and the top plate 20;

[0077] Further, the connecting member 33 is an elastic member, and is squeezed to fix the partition 31 and the top plate 20; or

[0078] The connecting member 33 is provided with a plurality of threaded holes, and bolts are threadedly installed in the threaded holes to fix the partition 31 and the top plate member 20 together through a pressing action;

[0079] Specifically, the connecting member 33 is used to connect the partition 31 and the top plate 20. When the pair of partitions 31 is transversely located between the pair of top plates 20, the upper ends thereof form a T-shaped structure with the top plate 20. At this time, the T-shaped groove 35 on the connecting member 33 can be directly matched and mounted on the T-shaped structure to fix the partition 31 and the top plate 20.

[0080] For example, the connecting piece 33 is an elastic piece of engineering plastics, which can be directly connected by snap-fitting. Although the connection is convenient and fast, there is a problem of unstable connection for some larger shafts 30;

[0081] For example, threaded holes are provided at different positions on the connecting member 33. After the connecting member 33 is clamped and connected, the bolt is threadedly installed on the threaded hole and one end is pressed against the partition 31 or the top plate 20 to achieve stable installation.

[0082] Further, the upper end of the shaft 30 has an expansion plate extending upward along its contour;

[0083] Specifically, according to the experimental requirements, the expansion plate can be detachably installed at the upper end of the shaft 30 to adjust the overall height of the shaft 30;

[0084] For example, Figure 6 As shown, a plurality of positioning holes 25 are provided on the side of the top plate 20 away from the rotation and the upper end of the partition 31;

[0085] Positioning holes 25 are provided at corresponding positions on the plurality of expansion plates, and positioning rods are inserted into the positioning holes 25 to extend the shaft 30 in the vertical height;

[0086] like Figure 3 As shown, in some embodiments, a plurality of first slide rails 12 and second slide rails 13 crisscrossing each other are provided on the bottom plate of the experimental tunnel 10;

[0087] The burner 40 and the lower end of the experimental trolley are slidably located in the first slide rail 12 or the second slide rail 13;

[0088] Specifically, the plurality of first slide rails 12 are spaced apart in the transverse direction at a spacing of 0.45 m, and each is longitudinally arranged in the length direction, and the plurality of second slide rails 13 are spaced apart in the longitudinal direction at a spacing of 1 m, and each is transversely arranged in the length direction;

[0089] The first slide rail 12 and the second slide rail 13 may be provided with scale marks; the burner 40 and the lower end of the experimental trolley may be mounted on the slider 41, and the slider 41 moves with the first slide rail 12 and the second slide rail 13 to meet the adjustment of different positions;

[0090] like Figure 1As shown, in some embodiments, the device further includes a driving component for driving the experimental trolley and the burner 40 in the experimental tunnel 10 to move;

[0091] The driving component comprises a traction rope 62 and a driving motor 61;

[0092] One end of the traction rope 62 is connected to one end of the experimental trolley or the burner 40, and the other end is longitudinally or transversely wound around the outside of a plurality of rollers and then connected to the other end of the experimental trolley or the burner 40;

[0093] The driving motor 61 is connected to one of the rollers to drive the traction rope 62 to perform traction action;

[0094] Specifically, the test vehicle and the burner 40 can be stationary or moving at different positions of the test tunnel 10 to adjust the blocking characteristic parameters, such as the blocking ratio, blocking position, and blocking quantity. When in motion, the test vehicle and the burner 40 are driven by the driving components, and the controller controls the start and stop, acceleration and deceleration, etc. of the driving motor 61 to simulate the fire and vehicle driving state in different motion states;

[0095] The burner 40 is used to simulate fire, and the fire source position can be adjusted in the horizontal and vertical positions. As explained, the experimental trolley can be self-driven, that is, it can be moved in the experimental tunnel 10 by remote control, etc., and the burner 40 can be installed on the trolley moved by remote control.

[0096] This is a tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation. It can realize the flexible control of multiple parameters such as shaft characteristic parameters, obstruction characteristic parameters, fire source location, etc., and quantitatively analyze the smoke flow law and temperature field distribution during tunnel fire under different working conditions.

[0097] That is, the number, position and size of the shaft 30 are determined according to the experimental requirements, that is, the adjacent top plate members 20 are rotated to a vertical position at a suitable position at the upper end of the experimental tunnel 10, and the strip opening opened by one of the top plate members 20 is closed by a pad 32, and then a pair of partitions 31 are installed between the vertical top plate members 20 through a connecting member 33 to form a shaft 30, and the position of the partition 31 determines the opening size of the shaft 30, and the telescopic plate 34 is moved to close the strip opening between the partition 31 and the supporting chute 11;

[0098] Make burners 40 of different sizes, match the burner 40 with the first slide rail 12 or the second slide rail 13 through the slider 41 to adjust its position in the test tunnel 10 to simulate the location of the fire source, and the burner 40 can be stationary or moving to simulate fires in different states;

[0099] Experimental trolleys of different types / sizes are manufactured. The experimental trolleys can be driven by themselves, or can be moved on the first slide rail 12 and the second slide rail 13 by a driving component to achieve precise control of the blocking position, blocking ratio, and blocking quantity; it is explained that during the position adjustment process, the burner 40 and the experimental trolley are staggered or move at the same speed to avoid conflict between them;

[0100] The axial flow fan 50 is started, and the air volume enters the experimental tunnel 10 evenly through the fairing, and the longitudinal ventilation wind speed reaches a specified value, which is used to simulate the ventilation of the experimental tunnel 10 and simulate the fire in combination with the shaft 30;

[0101] Thermocouples of different numbers and positions in the experimental tunnel 10 are used to measure the temperature field distribution in the tunnel during a fire. The smoke flow law in the tunnel during a fire is obtained in real time using cameras, sheet light sources and other equipment; the data acquisition device is used to record the smoke flow law, smoke settling law, temperature field distribution and other characteristic parameters in real time during the whole process of the tunnel fire; finally, the experimental data is analyzed, and the effects of the shaft 30 and the longitudinal ventilation under the comprehensive smoke exhaust are quantitatively analyzed to explore the influence of variable parameters such as blocking characteristic parameters and fire source location on the smoke flow law and temperature field during a tunnel fire;

[0102] When the experiment is completed, the longitudinal ventilation and the combustion of the burner 40 are stopped, and the next set of experiments are carried out after the room temperature in the experimental tunnel 10 is restored.

[0103] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

Claims

1. Tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation, characterized by: include: An experimental tunnel (10) is provided with an axial flow fan (50) for simulating different wind speeds at the longitudinal end, a strip opening arranged longitudinally at the upper end, and a stationary or moving burner (40) and an experimental trolley are provided inside; A plurality of top plate members (20) are laid side by side at the strip-shaped opening and close the strip-shaped opening, and each top plate member (20) can be rotated and switched from horizontal to vertical directions; After a pair of adjacent top plate members (20) are rotated to a vertical state, they form a ventilation shaft (30) with a pair of transversely arranged partitions (31), wherein an opening formed by the rotation of one of the top plate members (20) is paved by a pad (32).

2. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to claim 1 is characterized in that: The top plate member (20) comprises a single top plate body (22) and a plurality of support blocks (21) in a cross-shaped structure; The support block (21) can receive and support the pad (32) and the partition (31).

3. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to claim 2 is characterized in that: Supporting slide grooves (11) are provided on both lateral sides of the strip-shaped opening; The lower end of the supporting slide groove (11) is closer to the center of the strip opening than the upper end. When the top plate (20) is in a horizontal state, the lower end of the supporting slide groove (11) supports the top plate (20); Support shafts (23) are arranged transversely and movably located in the support slide grooves (11) on both sides of the center of the cross-shaped structure.

4. The tunnel fire simulation experimental platform under the comprehensive effect of shaft and ventilation according to claim 3 is characterized in that: The support shaft (23) is provided with a pair of symmetrically arranged cutouts (24); When the top plate (20) is in a horizontal state, the cutout (24) is parallel to the upper and lower sides of the support slide groove (11); when the top plate (20) is in a vertical state, the peripheral side of the support shaft (23) squeezes and limits the support slide groove (11).

5. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to any one of claims 1 to 4, characterized in that: The partition (31) is an L-shaped structure, and a groove is provided at the lower end; A telescopic plate (34) is movable in the groove and closes the lateral side of the strip-shaped opening.

6. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to any one of claims 1 to 4, characterized in that: The upper end of the partition (31) is connected to the top plate (20) via a connecting piece (33); The connecting piece (33) is provided with a T-shaped groove (35) which matches the thickness of the partition plate (31) and the top plate (20).

7. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to claim 6 is characterized in that: The connecting member (33) is an elastic member and is used to squeeze and fix the partition (31) and the top plate (20); or The connecting member (33) is provided with a plurality of threaded holes, and bolts are threadedly installed in the threaded holes to fix the partition plate (31) and the top plate member (20) together through a pressing action.

8. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to any one of claims 1 to 4, characterized in that: The upper end of the vertical shaft (30) is provided with an expansion plate extending upward along its contour.

9. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to any one of claims 1 to 4, characterized in that: A plurality of first slide rails (12) and second slide rails (13) which are crisscrossed are arranged on the bottom plate of the experimental tunnel (10); The burner (40) and the lower end of the experimental trolley are slidably located in the first slide rail (12) or the second slide rail (13).

10. The tunnel fire simulation experimental platform under the combined effect of shaft and ventilation according to claim 9 is characterized in that: It also includes a driving component for driving the experimental trolley and the burner (40) in the experimental tunnel (10); The driving component comprises a traction rope (62) and a driving motor (61); One end of the traction rope (62) is connected to one end of the experimental trolley or the burner (40), and the other end is longitudinally or transversely wound around the outside of a plurality of rollers and then connected to the other end of the experimental trolley or the burner (40); The driving motor (61) is connected to one of the rollers to drive the traction rope (62) to perform traction.

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