Tunnel hole external light smoke blocking system setting method based on Tyndall effect

Abstract

The invention relates to a tunnel outside light smoke blocking system setting method based on the Tyndall effect, and belongs to the field of tunnel operation safety. According to the method, two sets of light smoke blocking systems are arranged on a tunnel portal and a road section in front of the tunnel portal respectively and used in combination with audible and visual alarms on the two sides of the road; the straight road section setting mode is that the distance between the light smoke blocking systems is set according to one time of parking sight distance; according to the curve road section setting mode, the curvature radius is large, the one-time parking sight distance is not affected by roadside shielding, and the distance between light smoke blocking systems is larger than the one-time parking sight distance; the curvature radius is small, the one-time parking sight distance is not affected by roadside shielding, and arrangement of light smoke blocking systems outside a hole and two adjacent light smoke blocking systems is carried out according to the interval of the one-time parking sight distance; meanwhile, the arrangement distance of the audible and visual alarms is 80% of the distance of the straight road section; the curvature radius is small, the double parking sight distance is affected by roadside shielding, and a reinforcing warning sign is arranged in front of the tunnel. The vehicle can be stopped quickly, safely and effectively.

Description

Technical Field

[0001] The invention belongs to the field of tunnel operation safety and relates to a method for setting a tunnel exterior light and smoke blocking system based on the Tyndall effect. Background Art

[0002] The increase in the number of highway tunnels and the mileage of traffic has put forward higher requirements for safe operation, especially the increase in the number of long and large tunnels. Once a major incident such as a fire occurs in the tunnel, it is normal for vehicles outside the tunnel to continue to drive into the tunnel, causing congestion in the tunnel and escalating the harm of the incident. Therefore, when a major incident such as a fire occurs in the tunnel, blocking vehicles outside the tunnel as soon as possible is the most effective way to reduce the risk level of accidents, avoid congestion of vehicles and personnel in the tunnel, and ensure the rapid evacuation of personnel in the tunnel.

[0003] Therefore, the technical team has developed an all-weather visible optical smoke barrier system based on the Tyndall effect. Its advantage of being visible over the entire three-dimensional space and at a long distance can safely and quickly stop vehicles from moving forward.

[0004] Due to the different linear shapes, slopes, design speeds and surrounding environments of different types of highway tunnels, the impacts on drivers' physiological vision and parking behaviors are different. As a new safety blocking technology, in order to better realize the effective improvement of the tunnel operation safety level in sudden emergency situations, how to set up this technology for different tunnel types to meet the drivers' physiological vision and safe parking behaviors is still blank. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for setting up a light and smoke barrier system outside a tunnel based on the Tyndall effect, so as to solve the problem of how to reasonably set up the system for different tunnels when using the light and smoke barrier technology based on the Tyndall effect in the event of an emergency in the tunnel, so as to achieve rapid, safe and effective vehicle blocking.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for setting up a light smoke barrier system outside a tunnel based on the Tyndall effect, wherein two sets of light smoke barrier systems are respectively set up at the tunnel entrance and the road section ahead, and used in combination with sound and light alarms on both sides of the road; the road section includes a straight section and a curved section;

[0008] Straight section setting method: If there is a straight section in front of the tunnel, the distance between the light smoke barrier system 2 on the section and the light smoke barrier system 3 at the tunnel entrance is set at one time of the stopping sight distance;

[0009] There are three ways to set the curve section:

[0010] 1) Curved road sections with a large radius of curvature where the one-time stopping sight distance is not affected by roadside obstructions;

[0011] The distance between the light smoke barrier system 2 on the road section and the light smoke barrier system 3 at the tunnel entrance is greater than one time of the stopping sight distance;

[0012] 2) Curved sections with a small radius of curvature where the one-time stopping sight distance is not affected by roadside obstructions;

[0013] When the radius of curvature at the design speed is less than the minimum radius of curvature at the corresponding vehicle speed, the smoke barrier system outside the opening and between two adjacent lights shall be set at a spacing of one time the stopping sight distance; at the same time, in order to ensure that the driver can park quickly and safely within the stopping sight distance, the spacing of the sound and light alarms shall be set at 80% of the spacing of the straight road section;

[0014] 3) Curved sections with small radius of curvature and where the one-time stopping sight distance is affected by roadside obstruction;

[0015] Set up enhanced warning signs in front of the tunnel, so that drivers will have obvious deceleration behavior in front of the light smoke blocking information, so that the light smoke blocking information can play a role in safely blocking drivers within one times the stopping sight distance after the speed reduction; the specific setting method is as follows:

[0016] ① According to the radius of curvature, determine the maximum distance L at which the light and smoke blocking system at the tunnel entrance can be identified max ;

[0017] ② Set the maximum distance L max Determine the speed v′ required to reach the position as one times the stopping sight distance;

[0018] ③ According to the vehicle speed v′, determine the distance d required to safely reduce the design vehicle speed v0 to the speed v′ b ;

[0019] ④According to the distance d b Determine how to set up enhanced warning signs that meet the needs and rules for speed reduction.

[0020] Furthermore, the optical smoke barrier system includes a smoke generator that can produce a long-distance visible light curtain, a laser, a wind direction and speed meter, a flashing light, an information board, a loudspeaker, an intelligent cabinet and a control system.

[0021] Furthermore, in the straight section setting mode, the distance SD2 between the light smoke barrier system 2 on the section and the light smoke barrier system 3 at the tunnel entrance satisfies the following formula:

[0022]

[0023] Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, and s is the road slope.

[0024] Furthermore, in the setting mode of the curved road section, in the case of a curved road section with a large curvature radius and one-time stopping sight distance not affected by roadside obstruction: at the design vehicle speed, the one-time stopping sight distance and the curvature radius on the curved road section satisfy the relationship between radius and vehicle speed of formula (2), that is, at one-time stopping sight distance, the driver's line of sight can fully see the light smoke obstruction information;

[0025]

[0026] Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, s is the road slope, R is the radius of curvature of the curved section, and w is the width of the road.

[0027] Furthermore, in the setting mode of the curved road section, the radius of curvature is small, that is, it satisfies formula (3):

[0028]

[0029] Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, s is the road slope, R is the radius of curvature of the curved section, w is the width of the road, and a is the acceleration.

[0030] Furthermore, in the setting mode of curved road sections, in the case of a curved road section with a small curvature radius and one-time stopping sight distance affected by roadside obstruction, the maximum distance L max The calculation formula is:

[0031]

[0032] Among them, L1 represents the distance from the light smoke blocking system 2 on the road section when the driver sees the light smoke blocking information; L1 represents the distance from the light smoke blocking system 3 at the tunnel entrance when the driver sees the light smoke blocking information again after passing the light smoke blocking system 2 on the road section.

[0033] Furthermore, in the setting mode of curved road sections, in the case of a curved road section with a small radius of curvature and a one-time stopping sight distance affected by roadside obstruction, the calculation formula of the vehicle speed v′ is:

[0034]

[0035] Furthermore, in the setting mode of curved road sections, in the case of a curved road section with a small curvature radius and one-time stopping sight distance affected by roadside obstruction, the distance d b The calculation formula is:

[0036]

[0037] In the formula, a b is the safe braking deceleration of the vehicle during deceleration, and v0 is the design vehicle speed.

[0038] Furthermore, in the setting mode of curved road sections, in the case of a curved road section with a small curvature radius and a one-time stopping sight distance affected by roadside obstruction, according to the distance d b Determine the setting method of strengthening warning signs that meets the deceleration requirements and rules, specifically: use sound and light alarms, and their installation spacing d and alarm sound change frequency f should meet the following relationship:

[0039]

[0040] Wherein, v1 is the driving speed during deceleration, which is between the design speed v0 and the braking speed v′, and is a variable value. Therefore, d is the installation spacing of the sound and light alarm. Both the spacing d and the alarm sound change frequency f can be adjusted according to v′. The installation spacing d can also be installed in sections. The alarm sound change frequency f can be controlled by the control system by monitoring the vehicle speed, so that the alarm sound change frequency received by the driver during deceleration always satisfies the formula (7).

[0041] The beneficial effects of the present invention are:

[0042] (1) The method of the present invention combines the linear structure of the tunnel, which can satisfy the driver's physiological vision and safe parking behavior, and can help the driver quickly obtain and identify accident information from a long distance to achieve the effect of rapid and safe parking.

[0043] (2) The method of the present invention can obtain a system setting method that satisfies the technical characteristics of light smoke blocking under the conditions of the driver's dynamic field of view and parking sight distance on different linear sections. Through this method, the system can play a role in quickly and safely blocking vehicles.

[0044] (3) The method of the present invention has the characteristics of intelligent linkage control of the light and smoke barrier system in combination with the linear characteristics of the tunnel section. It can automatically control the system's sound and light alarm decibel, frequency, light and smoke concentration, brightness and angle according to the curvature and slope of the section ahead of the tunnel and the linear identification distance between the driver and the light and smoke barrier system, thereby realizing the rapid diversion and safe blocking control of vehicles in tunnels with different road structures in the event of major accidents such as fire.

[0045] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0047] Figure 1 This is a schematic diagram of the method for setting up a light smoke barrier system;

[0048] Figure 2 Turn on the effect of the light smoke blocking system;

[0049] Figure 3 System settings diagram for road sections with large radius of curvature;

[0050] Figure 4 System settings for roads with small curvature radius and no roadside obstructions;

[0051] Figure 5 System settings for roads with small radius of curvature and roadside obstructions;

[0052] Figure 6 The present invention is a flow chart of a method for setting up a tunnel exterior light and smoke barrier system based on the Tyndall effect. DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0054] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0055] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] See also Figure 1 to Figure 6 The method for setting up the tunnel exterior light and smoke blocking system based on the Tyndall effect of the present invention is shown as follows: Figure 1 As shown in the figure, according to the characteristics of light smoke blocking technology, two sets of light smoke blocking systems are set up at the tunnel entrance and the road ahead. The effect after the system is activated is as follows Figure 2 shown.

[0057] The present invention mainly aims at the characteristics of optical smoke blocking technology to develop a system installation method that can make the driver visible and identifiable within a safe distance and achieve safe parking in different linear routes and tunnels. Specifically divided into straight sections and curved sections:

[0058] (1) Straight road section setting method

[0059] Based on the characteristics of the horizontal stereoscopic long-distance visibility of the optical smoke barrier technology, and the light curtain formed by this technology will not physically contact and collide with the vehicle, even if it fails to stop in time and passes through the light curtain layer, there will be no collision with hard objects to cause stress reaction. However, in the setting of the system, it should be set according to the most unfavorable working conditions, that is, at the design speed, the driver should be able to identify the optical smoke barrier information at least at one time of the parking sight distance; under normal circumstances, when the driver sees the optical smoke barrier system 2 on the road section at one time of the parking sight distance, he should start to slow down and stop before the optical smoke barrier system 2 on the road section, but at the same time, there is also the possibility that some vehicles will ignore the blocking information and continue to move forward. Therefore, according to the most unfavorable working conditions, the distance between the optical smoke barrier system 2 on the road section and the optical smoke barrier system 3 at the tunnel entrance is also set at one time of the parking sight distance, which plays a role in strengthening the parking barrier effect. Therefore, in the case where there is a straight section in front of the tunnel, the distance between the optical smoke barrier system 2 on the road section and the optical smoke barrier system 3 at the tunnel entrance should satisfy the following formula:

[0060]

[0061] Where t is the driver's reaction and vehicle braking time, in seconds; v is the vehicle speed, in meters per second; g is the acceleration due to gravity, in meters per second. 2; f is the friction coefficient of the road surface, which depends on the vehicle speed and road conditions; s is the road slope. Usually the reaction time and braking time in plain areas is 2.5s.

[0062] Since the straight line visual distance of this technology is greater than one times the parking sight distance, for a straight line route, the distance SD1 between the vehicle and the light smoke barrier system 2 on the road section itself meets the condition of being greater than one times the parking sight distance. According to the safety warning requirements of traffic engineering, the sound and light alarms installed on both sides of the road can be arranged at a certain interval from 500m outside the tunnel entrance to play a warning role in deceleration.

[0063] (2) Curved section setting method

[0064] When the route ahead of the tunnel is a curved section, different roadside environments will affect whether the light and smoke blocking information within one time of the stopping sight distance is visible; in addition, curved sections with different curvature radii also have the situation of whether the light and smoke blocking information within one time of the stopping sight distance is visible. Therefore, the present invention proposes a setting method of the light and smoke blocking system for different curved sections, so that when the tunnel ahead is a curved section, the system can also quickly and safely play an effective role in blocking vehicles when an emergency occurs in the tunnel. The specific method is as follows:

[0065] 1) Curved road sections with a large radius of curvature where the one-time stopping sight distance is not affected by roadside obstructions;

[0066] like Figure 3 As shown. At the design speed, the one-time stopping sight distance and the radius of curvature on the road section satisfy the relationship between radius and speed in formula (2), that is, at one-time stopping sight distance, the driver's line of sight can fully see the light smoke blocking information. At this time, the system setting method of this road section is consistent with the straight road section method, that is, the distance SD2 between the light smoke blocking system 2 on the road section and the light smoke blocking system 3 at the tunnel entrance is greater than one-time stopping sight distance. When this condition is met, the light smoke blocking system 2 on the road section and the light smoke blocking system 3 at the tunnel entrance can be seen outside one-time stopping sight distance.

[0067]

[0068] Where R is the radius of curvature of the curved road section, and w is the width of the road.

[0069] For example, on a road section with a slope of 0, when the curvature radius is greater than the following table 1 at different design vehicle speeds, the distance between blocking system 3 and the tunnel entrance and between blocking systems 2 and 3 can be set at a distance of one times the stopping sight distance. The corresponding relationship between different vehicle speeds and the minimum curvature radius at other slopes can be obtained by formula (2).

[0070] Table 1 Relationship between the minimum curvature radius that can be set at one time the stopping sight distance and the design vehicle speed

[0071] Design speed / km / h 50 60 70 80 90 100 110 120 Minimum curvature radius / m 70 115 180 260 360 490 650 850

[0072] 2) Curved sections with a small radius of curvature where the one-time stopping sight distance is not affected by roadside obstructions;

[0073] like Figure 4 As shown in FIG. 1 , when the radius of curvature of the curved road section is small, that is, when it is under the condition of formula (3), but there is no high slope or other obstacles on the road side to block the view, the driver's line of sight may be affected by low boundaries such as roadside guardrails. However, based on the characteristic that the three-dimensional space of the light smoke blocking information is visible at a long distance, most of the light smoke blocking systems can still be seen within the driver's field of vision. Therefore, the setting spacing between the light smoke blocking systems 2 and 3 can still be set at a spacing greater than one times the stopping sight distance. That is, when the radius of curvature at the design speed is less than the value specified in Table 1, since there is no high slope or other obstacles on the road test to block the visual space of the three-dimensional space, the setting of the light smoke blocking systems outside the opening and between the two adjacent systems can still be performed at a spacing of one times the stopping sight distance.

[0074] At the same time, in order to ensure that the driver can park quickly and safely within the parking sight distance, the spacing of the sound and light alarms can be set at 80% of the spacing of the straight section.

[0075]

[0076] 3) Curved sections with small radius of curvature and where the one-time stopping sight distance is affected by roadside obstruction;

[0077] like Figure 5 As shown in the figure, when the radius of curvature of the curved road section is small and the condition of formula (3) is met, but there are obstacles such as high slopes on the roadside that block the driver's sight, there is a one-time stopping sight distance where the driver cannot see the light smoke blocking information. Once the driver sees the light smoke blocking information, the distance from the blocking system is less than the safe stopping sight distance, that is, at this time, L1 or L2 is less than one-time stopping sight distance SD. For this situation, a reinforced warning sign should be set in front of the tunnel so that the driver will have obvious deceleration behavior before seeing the light smoke blocking information, so that the light smoke blocking information can play a role in safely blocking the driver within one-time stopping sight distance after the speed reduction.

[0078] The details are as follows:

[0079] ① According to the radius of curvature, determine the maximum distance at which the light and smoke barrier system at the tunnel entrance can be identified;

[0080]

[0081] Table 2 shows the maximum distance at which the blocking system can be identified when different curvature radii cannot meet the stopping sight distance at the current highway design speed.

[0082] Table 2 Relationship between curvature radius and maximum recognizable distance

[0083] Curvature radius / m 50 100 200 300 400 500 600 Maximum recognizable distance / m 45 60 85 105 120 135 145

[0084] ② Set the maximum distance L max The vehicle speed v′ to reach this position is determined as one times the stopping sight distance.

[0085] For example, the vehicle speed v' requirement corresponding to the slope of 0 is shown in Table 3. Other slope conditions can be calculated by formula (5).

[0086]

[0087] Table 3 Vehicle speed requirements corresponding to the stopping sight distance

[0088] Curvature radius / m 50 100 200 300 400 500 600 Stopping sight distance / m 45 60 85 105 120 135 145 Speed ​​requirement / km / h 45 56 73 85 93 100 105

[0089] ③ According to the vehicle speed v′, determine the distance d required to safely reduce the design vehicle speed v0 to the speed v′ b Table 4 illustrates the distance required when the vehicle speed on the road section is reduced from 120 km to the speeds shown in Table 3. The distance required for reducing the speed of other design speeds can also be obtained by formula (6).

[0090]

[0091] In the formula, a b The safe braking deceleration of the vehicle during deceleration, in m / s 2 ; v0 is the design vehicle speed.

[0092] Table 4 Required safe braking distance when slowing down from 120km / h to various speeds

[0093] Speed ​​reduction requirement / km / h 45 56 73 85 93 100 105 Required distance / m 238 216 175 140 111 82 62

[0094] ④According to the distance d b Determine the setting method of strengthening warning signs that meets the deceleration requirements and rules. Usually, sound and light alarms can be used. The installation spacing d and the alarm sound change frequency f should meet the following relationship:

[0095]

[0096] Wherein, v1 is the driving speed during deceleration, which is between the design speed v0 and the braking speed v′, and is a variable value. Therefore, the installation spacing d of the sound and light alarm and the alarm sound change frequency f can be adjusted according to v′. The installation spacing d can be installed in sections, and the alarm sound change frequency f can be controlled by the control system by monitoring the vehicle speed, so that the alarm sound change frequency received by the driver during deceleration always satisfies formula (7).

[0097] like Figure 6 As shown, the specific process of the method for setting up the tunnel external light and smoke blocking system based on the Tyndall effect provided by the present invention is as follows:

[0098] Step 1: Determine the setting method of straight or curved section according to the design vehicle speed and the parameters of the tunnel section (including curvature radius, slope, road width and friction coefficient).

[0099] Step 2: Determine the maximum recognition distance based on whether the blocking information of one times the parking sight distance is visible and whether there is blocking information such as high slopes on the road side, and then determine the deceleration requirement.

[0100] Step 3: Determine the system setting method, including light smoke barrier system concentration control, light smoke barrier system setting spacing, enhanced system setting spacing, and enhanced alarm flashing and sound intensity control frequency.

[0101] The characteristics of the present invention are as follows: utilizing the characteristic of the optical smoke barrier system that it is visible in three-dimensional space from a long distance, different setting methods are proposed for different line shapes and slopes outside the tunnel and different surrounding shielding conditions, so that it can quickly and safely block vehicles when an emergency occurs in the tunnel. The setting distance of the two blocking systems at the tunnel entrance and the road section in front of the tunnel entrance can be determined according to the line shape, slope and design speed of the route, and the safe deceleration requirements can be determined according to the surrounding shielding conditions, as well as the setting and linkage control requirements of the enhanced alarm system under safe deceleration. This can provide technical support for the application of the optical smoke barrier system in different types of tunnels.

[0102] Based on the advantages of intuitive information and wide applicability of optical smoke blocking, this technology can be used to achieve suitable installation in different types of tunnel sections, determine the installation method according to the actual road shape and environment, and realize information display linkage of different installation methods through the control system, so that no matter what kind of tunnel section, once an emergency occurs in the tunnel, the setting method of this technology is adopted and the system is turned on, which can immediately play a role in fast and safe on-site active blocking and control of vehicles. At the same time, as an on-site active intelligent control method, the implementation of this technology can be linked with the currently popularized tunnel intelligent control platform for information linkage, and realize the control linkage of optical smoke blocking systems in different types of sections for the purpose of safe deceleration, thereby improving the integrated control of the emergency control system and improving the rapid, effective and intelligent control level of safety control.

[0103] The advantages of the present invention are: 1) Highly targeted. The design method formed according to the characteristics of the optical smoke barrier system fills the method gap in the application field of this innovative technology and is an international first; 2) The system application is highly instructive. Different setting methods are proposed for different types of tunnel sections, which can quickly and safely block vehicles in emergency situations and reduce the risk of accidents; 3) The method of the present invention can be combined with intelligent management and control technology to achieve the control intensity and frequency of different components of the system (such as optical smoke generators, sound and light alarms), etc., to achieve the effect of vehicles in different types of tunnel sections being quickly and safely decelerated and blocked outside the tunnel; 4) This method takes into account the advantage of the long-distance visibility of the three-dimensional space of the optical smoke barrier information, simplifies the setting method of curved sections with different curvature radii without the influence of high slopes and other obstructions, and is conducive to the efficient design and application of the technology of the present invention.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect, characterized in that: Two sets of optical smoke barrier systems are respectively installed at the tunnel entrance and the road section ahead, and used in conjunction with the sound and light alarms on both sides of the road; the road section includes a straight section and a curved section; Setting method for straight road section: If there is a straight road section in front of the tunnel, the distance between the light smoke barrier system on the road section and the light smoke barrier system at the tunnel entrance is set at one time of the stopping sight distance; There are three ways to set the curve section: 1) Curved sections with large radius of curvature and one-time stopping sight distance not affected by roadside obstruction; The distance between the optical smoke barrier system on the road section and the optical smoke barrier system at the tunnel entrance is greater than one time of the stopping sight distance; 2) Curved sections with small radius of curvature and one-time stopping sight distance not affected by roadside obstruction; When the radius of curvature at the design speed is less than the minimum radius of curvature at the corresponding vehicle speed, the smoke barrier system outside the opening and between two adjacent lights shall be set at a spacing of one time the stopping sight distance; at the same time, in order to ensure that the driver can park quickly and safely within the stopping sight distance, the spacing of the sound and light alarms shall be set at 80% of the spacing of the straight road section; 3) Curved sections with small radius of curvature and where the one-time stopping sight distance is affected by roadside obstruction; Set up enhanced warning signs in front of the tunnel, so that drivers will have obvious deceleration behavior in front of the light smoke blocking information, so that the light smoke blocking information can play a role in safely blocking drivers within one times the stopping sight distance after the speed reduction; the specific setting method is as follows: ① According to the radius of curvature, determine the maximum distance L at which the light and smoke blocking system at the tunnel entrance can be identified max ; ② Set the maximum distance L max As one times the stopping sight distance, determine the speed v of the vehicle traveling to that position. ′ ; ③According to the vehicle speed v ′ Determine the safe reduction from the design speed v0 to the speed v ′ Required distance d b ; ④According to the distance d b Determine how to set up enhanced warning signs that meet the needs and rules for speed reduction.

2. According to the method for setting up the tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 1, it is characterized in that: The optical smoke blocking system includes a smoke generator capable of generating a long-distance visible light curtain, a laser, a wind direction and anemometer, a flashing light, an information board, a loudspeaker, an intelligent cabinet and a control system.

3. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 1 is characterized in that: In the straight section setting mode, the distance SD2 between the light smoke barrier system on the section and the light smoke barrier system at the tunnel entrance satisfies the following formula: Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, and s is the road slope.

4. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 1 is characterized in that: In the setting mode of curved road sections, in the case of curved road sections with large curvature radius and one-time stopping sight distance not affected by roadside obstruction: at the design speed, one-time stopping sight distance and curvature radius on the curved road section satisfy the relationship between radius and speed of formula (2), that is, at one-time stopping sight distance, the driver's line of sight can fully see the light smoke obstruction information; Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, s is the road slope, R is the radius of curvature of the curved section, and w is the width of the road.

5. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 1 is characterized in that: In the setting method of the curved road section, the curvature radius is small, that is, it satisfies formula (3): Where t is the driver's reaction and vehicle braking time, v is the vehicle speed, g is the acceleration of gravity, f is the road friction coefficient, s is the road slope, R is the radius of curvature of the curved section, and w is the width of the road.

6. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 5 is characterized in that: In the setting mode of curved road section, in the case of a curved road section with a small curvature radius and one-time stopping sight distance affected by roadside obstruction, the maximum distance L max The calculation formula is: Among them, L1 represents the distance from the light smoke blocking system on the road section when the driver sees the light smoke blocking information; L1 represents the distance from the light smoke blocking system 3 at the tunnel entrance when the driver sees the light smoke blocking information again after passing the light smoke blocking system on the road section.

7. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 5, characterized in that: In the setting mode of curved road section, in the case of a curved road section with a small curvature radius and a one-time stopping sight distance affected by roadside obstruction, the vehicle speed v ′ The calculation formula is:

8. The method for setting up a light and smoke blocking system outside a tunnel based on the Tyndall effect according to claim 5 is characterized in that: In the setting mode of curved road section, in the case of a curved road section with a small curvature radius and one-time stopping sight distance affected by roadside obstruction, the distance d b The calculation formula is: In the formula, a b is the safe braking deceleration of the vehicle during deceleration, and v0 is the design vehicle speed.

9. The method for setting up a tunnel exterior light and smoke blocking system based on the Tyndall effect according to claim 5, characterized in that: In the setting mode of curved road section, in the case of a curved road section with a small curvature radius and one-time stopping sight distance affected by roadside obstruction, according to the distance d b Determine the setting method of strengthening warning signs that meets the deceleration requirements and rules, specifically: use sound and light alarms, and their installation spacing d and alarm sound change frequency f should meet the following relationship: Wherein, v1 is the driving speed during deceleration, which is between the design speed v0 and the braking speed v′, and is a variable value. Therefore, the installation spacing of the sound and light alarm, the spacing and the alarm sound change frequency f are adjusted according to v′, and the installation spacing d is also installed in sections. The alarm sound change frequency f is controlled by the control system by monitoring the vehicle speed, so that the alarm sound change frequency received by the driver during deceleration always satisfies formula (7).

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