Comprehensive protection method and system for highway-railway flat-layer bridge operation safety
阅读说明：本技术 一种公铁平层大桥运营安全综合防护方法及系统 (Comprehensive protection method and system for highway-railway flat-layer bridge operation safety ) 是由 涂辉招 李�浩 孙立军 遇泽洋 崔航 于 2020-07-22 设计创作，主要内容包括：本发明涉及一种公铁平层大桥运营安全综合防护方法及系统。本发明提供了防眩板的高度超过高度阈值时的替代方案,将防眩板替换为防抛网或者风屏障,使防抛网或者风屏障具有防眩功能,实现了对公铁平层大桥运营安全的防风、防眩、防抛的综合防护,填补了公铁平层大桥运营安全的综合防护的空白；并且本发明还提供了评价防抛网、风屏障的防眩性能的方法,同样填补了现有技术尚无防抛网、风屏障的防眩性能的评价方法的空白。(The invention relates to a method and a system for comprehensively protecting the operation safety of a highway-railway flat-bed bridge. The invention provides a substitution scheme when the height of the anti-dazzle plate exceeds a height threshold value, the anti-dazzle plate is replaced by an anti-throwing net or a wind barrier, so that the anti-throwing net or the wind barrier has an anti-dazzle function, the comprehensive protection of wind prevention, anti-dazzle and anti-throwing on the operation safety of a highway and railway flat-layer bridge is realized, and the blank of the comprehensive protection of the operation safety of the highway and railway flat-layer bridge is filled; the invention also provides a method for evaluating the anti-dazzle performance of the anti-net-throwing and wind-shielding screen, and also fills the blank that no method for evaluating the anti-dazzle performance of the anti-net-throwing and wind-shielding screen exists in the prior art.)
1. A highway-railway flat-bed bridge operation safety comprehensive protection method is characterized by comprising the following steps:
acquiring the height of an anti-dazzle plate when the sight of a driver of a vehicle running on a highway is not influenced by glare generated by a head lamp of a railway locomotive;
judging whether the height of the anti-dazzle plate exceeds a height threshold value or not to obtain a first judgment result;
if the first judgment result shows that the anti-dazzle plate is a net, replacing the anti-dazzle plate with an anti-throwing net with a preset steel wire diameter or a wind barrier with a preset thickness and a preset aperture;
calculating the light transmission area proportion of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
determining the glare limit threshold increment of each glare evaluation point on a straight line of the position where the glare influences the line of sight of a driver of a vehicle running on a highway to be worst by using an incapability glare evaluation method according to the light transmission area ratio;
judging whether the maximum value of the glare limit threshold value increment of all the glare evaluation points exceeds the standard threshold value of the glare limit threshold value increment or not to obtain a second judgment result;
if the second judgment result shows that the steel wire diameter is not the preset steel wire diameter, selecting the anti-throwing net with the preset steel wire diameter or the wind barrier with the preset thickness and the preset aperture;
if the second judgment result shows that the current position is the preset position, updating the preset steel wire diameter of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier, and returning to the step of calculating the light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
and if the first judgment result shows no, selecting the anti-dazzle plate with the height.
2. The comprehensive operation safety protection method for the highway-railway flat-bed bridge according to claim 1, wherein the step of obtaining the height of the glare shield when the glare generated by the headlamp of the railway locomotive does not affect the sight of the driver of the vehicle running on the highway specifically comprises the following steps:
using formulasCalculating the height x of the glare shield when the glare passing through the glare shield strikes at least the edge of the shoulder of the road on the side farther from the railway1；
Using formulas
X is to be1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not influence the sight of a driver driving a vehicle on a highway;
wherein l1For the anti-glare panel to be at the far side of the road from the railwayShoulder edge distance,/2Is the width of the road, delta l is the distance between the railway and the shoulder of the road, h0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
3. The comprehensive highway-railway flat-bed bridge operation safety protection method according to claim 1, wherein the step of calculating the light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier specifically comprises the following steps:
when the anti-throwing net is selected, the formula is utilized according to the preset steel wire diameter of the anti-throwing netCalculating the light transmission area ratio R of the anti-throwing netL；
When the wind screen is selected, according to the preset thickness and the preset aperture of the wind screen, a formula R 'is utilized'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L；
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,s is the pore area, s ═ n pi (R/2)2R is the preset aperture of the wind barrier, n is the number of pores, S is the area of the wind barrier, M is the thickness reduction coefficient,b is a minor semi-axis of the elliptical projection of the aperture along the oblique direction of the light, d is the distance between two elliptical projections of the aperture along the oblique direction of the light, d is L cos theta, and L is the preset thickness of the wind barrier.
4. The comprehensive operation safety protection method for the highway-railway flat-bed bridge according to claim 1, wherein the step of determining the glare limit threshold increment of each glare evaluation point on a straight line at which the glare influences the most unfavorable position of the sight of a driver of a vehicle running on the highway by using the incapability glare evaluation method according to the light transmission area ratio specifically comprises the following steps:
when the transverse distance between the road and the railway is minimum and the relative height difference is minimum, determining each glare evaluation point of which the glare influences the sight of a driver of a vehicle running on the road, wherein all glare evaluation points form a most unfavorable position straight line;
when the included angle between the sight line and the incident direction of the light of the glare source is in the range of 1.5-60 degrees, the formula is utilizedDetermining an equivalent light curtain luminance L for each glare evaluation point on the worst position straight linev；
In the background luminance range of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is usedDetermining a glare limit threshold increment TI of each glare evaluation point;
wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) generated by the glare source on the plane perpendicular to the line of sight in the eyes of the observer, α is the angle between the line of sight and the incident direction of the light of the glare source, K is a constant and depends on the unit of α, when α is represented by angle, K is 10, when α is represented by radian, K is 3 × 10-3，
5. The comprehensive operation safety protection method for highway/railway flat-bed bridges according to claim 1, wherein the updating of the preset steel wire diameter of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier specifically comprises:
increasing the diameter of the steel wires of the protective net, increasing the thickness of the wind screen, decreasing the aperture of the wind screen, or increasing the pore space of the wind screen.
6. The utility model provides a protection system is synthesized to highway-railway flat-bed bridge operation safety which characterized in that, protection system includes:
the height acquisition module of the anti-glare panel is used for acquiring the height of the anti-glare panel when the sight of a driver of a vehicle running on a highway is not influenced by glare generated by a headlamp of a railway locomotive;
the first judgment result acquisition module is used for judging whether the height of the anti-dazzle plate exceeds a height threshold value to obtain a first judgment result;
the first judgment result representation module is used for replacing the anti-dazzle plate with an anti-throwing net with a preset steel wire diameter or a wind barrier with a preset thickness and a preset aperture if the first judgment result represents that the anti-dazzle plate is positive;
the light transmission area proportion calculation module is used for calculating the light transmission area proportion of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
the glare limiting threshold increment determining module is used for determining the glare limiting threshold increment of each glare evaluation point on a straight line of the position where the glare influences the line of sight of a driver of a vehicle running on a highway to be worst by using an incapability glare evaluation method according to the light transmission area ratio;
the second judgment result acquisition module is used for judging whether the maximum value of the glare limit threshold increment of all the glare evaluation points exceeds the standard threshold of the glare limit threshold increment or not to obtain a second judgment result;
a second judgment result representing module, configured to select the anti-throwing net with the preset steel wire diameter or the wind barrier with the preset thickness and the preset aperture if the second judgment result represents that the net is not thrown;
an updating module, configured to update a preset steel wire diameter of the anti-throwing net, a preset thickness of the wind barrier, or a preset aperture of the wind barrier if the second determination result indicates yes, and return to the step of "calculating a light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier";
and the antiglare shield determination module is used for selecting the antiglare shield with the height if the first judgment result shows no.
7. The integrated protection system for highway-railway flat-bed bridge operation safety according to claim 6, wherein the antiglare shield height acquisition module comprises:
a first antiglare plate height acquisition submodule for utilizing a formulaCalculating the height x of the glare shield when the glare passing through the glare shield strikes at least the edge of the shoulder of the road on the side farther from the railway1；
A second antiglare plate height acquisition submodule for utilizing a formulaCalculating the height x of the glare shield when the glare passing through the shield and striking the road does not affect at least the sight line of the driver driving on the outermost lane of the railway2；
A third glare prevention plate height determination submodule for converting x1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not influence the sight of a driver driving a vehicle on a highway;
wherein l1The distance between the anti-dazzle plate and the edge of the road shoulder at the far side of the road from the railway2Is the width of the road, delta l is the distance between the railway and the shoulder of the road, h0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
8. The integrated protection system for highway/railway flat-layer bridge operation safety according to claim 6, wherein the light-transmitting area ratio calculation module comprises:
a light transmission area proportion calculation submodule of the anti-throwing net, which is used for utilizing a formula according to the preset steel wire diameter of the anti-throwing net when the anti-throwing net is selected
The wind barrier light transmission area proportion calculation submodule is used for utilizing a formula R 'according to the preset thickness and the preset aperture of the wind barrier when the wind barrier is selected'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L；
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,
9. The integrated protection system for highway-railway flat-bed bridge operation safety according to claim 6, wherein the glare limit threshold increment determination module comprises:
the worst position straight line forming submodule is used for determining each glare evaluation point of glare influencing the sight of a driver of a vehicle running on a highway when two adverse conditions of a minimum transverse distance and a minimum relative height difference between the highway and the railway exist at the same time, and all the glare evaluation points form a worst position straight line;
an equivalent light curtain brightness determining submodule for utilizing a formula when an included angle between the sight line and the incident direction of the light of the glare source is in a range of 1.5-60 DEGDetermining an equivalent light curtain luminance L for each glare evaluation point on the worst position straight linev；
A glare limit threshold increment determination submodule for determining a threshold increment for a luminance in the background of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is used
wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) generated by the glare source on the plane perpendicular to the line of sight in the eyes of the observer, α is the angle between the line of sight and the incident direction of the light of the glare source, K is a constant and depends on the unit of α, when α is represented by angle, K is 10, when α is represented by radian, K is 3 × 10-3，
10. The integrated protection system for highway-railway flat-bed bridge operation safety according to claim 6, wherein the updating module comprises:
and the updating submodule is used for increasing the diameter of the steel wire of the protective net, increasing the thickness of the wind barrier, reducing the aperture of the wind barrier or increasing the pore space of the wind barrier.
Technical Field
The invention relates to the field of traffic comprehensive protection, in particular to a method and a system for comprehensive protection of highway-railway flat-bed bridge operation safety.
Background
The highway-railway dual-purpose bridge is one of bridge types which are designed in the world and occupy the most saved channel resources, and accords with the human survival law of environmental protection, energy conservation and sustainable development. In a highway-railway flat-layer bridge, the horizontal distance between a railway and a highway is very short, due to the fact that a high-speed train is high in running speed, headlamps are high in light intensity and strong in light condensation, a light field is generated, local wind is generated when the train passes through, crosswind is generated in the sea area, and the like, the complex environments can possibly have adverse effects on the running comfort and safety of vehicles on the adjacent highway, and even traffic accidents are caused. Therefore, it is necessary to analyze the local complex environment generated during the operation of the railway and the influence thereof on the driving safety of the adjacent expressway, and to provide a corresponding protection method.
At present, a comprehensive protection method aiming at the operation safety of a highway-railway flat-layer bridge does not exist, protection aiming at the problems of anti-dazzle, wind prevention, anti-throwing and the like is respectively considered, corresponding protection measures are respectively arranged, and systematicness and matching performance among the protection measures are lacked. Therefore, the following problems often occur:
(1) the existing highway-related regulations limit the maximum height of the antiglare shield, but no alternative is given to the excessively high antiglare shield, and the limiting method is as follows:
(ii) as shown in FIG. 1, the height H of the straightway antiglare shield:
in the formula: h 1-automobile headlight height (m)
h 2-driver sight height (m)
B1 and B2 are respectively the distance (m) from the center line of the antiglare shield to vehicles on different roadways.
In fig. 1, L is a horizontal distance between two vehicles on different roadways, β is an included angle between a connecting line of the two vehicles on different roadways and a center line of the roadway, B is a vertical distance between the two vehicles on different roadways, and α is an included angle between a connecting line of a maximum height of the automotive headlamp and a maximum height of a driver's sight line and a horizontal plane.
Secondly, in the vertical curve section, when the radius of the vertical curve is smaller than the general minimum radius specified by the current technical Standard for road engineering (JTG B01), whether the height of the anti-dazzle plate meets the shading requirement or not is calculated according to the sizes of longitudinal slopes in front of and behind the vertical curve section.
And the height of the anti-dazzle plate is not more than 2 m.
The main problems that exist are:
at present, no provision for the height of the highway-railway flat-layer bridge antiglare shield exists. Aiming at the highway and railway flat-layer bridge anti-glare plate, the glare passing through the anti-glare plate at least irradiates the edge of the shoulder of the highway on the side far away from a high-speed rail, and the glare irradiating the highway at least does not influence the sight of a driver driving on a lane at the outermost side of a railway.
The height of the anti-dazzle plate is required to be not more than 2m according to the existing specification, but the calculated height of the anti-dazzle plate often exceeds the specification requirement under the conditions that the light intensity of a railway light source of a highway-railway flat-layer bridge is strong and the road-railway flat distance is small, but the corresponding solution and the alternative scheme are not given by the existing method.
(2) Various protective facilities between the railways have certain matching and substitution, for example, facilities such as a wind barrier, an anti-throwing net and the like also have certain anti-dazzle performance, so that the protective facility schemes are comprehensively considered and proposed for three protective requirements such as anti-dazzle, anti-wind and anti-throwing, but at present, no method for evaluating the anti-dazzle performance of the wind barrier and the anti-throwing net exists, and no comprehensive protective method for the operation safety of a highway-railway flat-layer bridge exists.
Disclosure of Invention
The invention aims to provide a highway-railway flat-layer bridge operation safety comprehensive protection method and a highway-railway flat-layer bridge operation safety comprehensive protection system, so as to select protection facilities meeting anti-dazzle requirements and improve the highway-railway flat-layer bridge operation safety comprehensive protection.
In order to achieve the purpose, the invention provides the following scheme:
a highway-railway flat-bed bridge operation safety comprehensive protection method comprises the following steps:
acquiring the height of an anti-dazzle plate when the sight of a driver of a vehicle running on a highway is not influenced by glare generated by a head lamp of a railway locomotive;
judging whether the height of the anti-dazzle plate exceeds a height threshold value or not to obtain a first judgment result;
if the first judgment result shows that the anti-dazzle plate is a net, replacing the anti-dazzle plate with an anti-throwing net with a preset steel wire diameter or a wind barrier with a preset thickness and a preset aperture;
calculating the light transmission area proportion of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
determining the glare limit threshold increment of each glare evaluation point on a straight line of the position where the glare influences the line of sight of a driver of a vehicle running on a highway to be worst by using an incapability glare evaluation method according to the light transmission area ratio;
judging whether the maximum value of the glare limit threshold value increment of all the glare evaluation points exceeds the standard threshold value of the glare limit threshold value increment or not to obtain a second judgment result;
if the second judgment result shows that the steel wire diameter is not the preset steel wire diameter, selecting the anti-throwing net with the preset steel wire diameter or the wind barrier with the preset thickness and the preset aperture;
if the second judgment result shows that the current position is the preset position, updating the preset steel wire diameter of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier, and returning to the step of calculating the light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
and if the first judgment result shows no, selecting the anti-dazzle plate with the height.
Optionally, the obtaining of the height of the antiglare shield when the sight of a driver of a vehicle running on a highway is not affected by glare generated by a headlamp of a railway locomotive specifically includes:
using formulasCalculating the road shoulder of the road far away from the railwayHeight x of antiglare shield at edge1；
Using formulasCalculating the height x of the glare shield when the glare passing through the shield and striking the road does not affect at least the sight line of the driver driving on the outermost lane of the railway2；
X is to be1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not influence the sight of a driver driving a vehicle on a highway;
wherein l1The distance between the anti-dazzle plate and the edge of the road shoulder at the far side of the road from the railway2Is the width of the road, delta l is the distance between the railway and the shoulder of the road, h0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
Optionally, the calculating of the light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier specifically includes:
when the anti-throwing net is selected, the formula is utilized according to the preset steel wire diameter of the anti-throwing netCalculating the light transmission area ratio R of the anti-throwing netL；
When the wind screen is selected, according to the preset thickness and the preset aperture of the wind screen, a formula R 'is utilized'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L；
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,s is the pore area, s ═ n pi (R/2)2R is the preset aperture of the wind barrier, n is the number of pores, S is the area of the wind barrier, M is the thickness reduction coefficient,
Optionally, the determining, according to the ratio of the light transmission areas, a glare limit threshold increment of each glare evaluation point on a straight line at a position where a driver's sight line of a vehicle running on a highway is most unfavorable due to glare influence by glare by using an incapability glare evaluation method specifically includes:
when the transverse distance between the road and the railway is minimum and the relative height difference is minimum, determining each glare evaluation point of which the glare influences the sight of a driver of a vehicle running on the road, wherein all glare evaluation points form a most unfavorable position straight line;
when the included angle between the sight line and the incident direction of the light of the glare source is in the range of 1.5-60 degrees, the formula is utilizedDetermining an equivalent light curtain luminance L for each glare evaluation point on the worst position straight linev；
In the background luminance range of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is usedDetermining a glare limit threshold increment TI of each glare evaluation point;
wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) produced by the glare source on a plane perpendicular to the line of sight in the observer's eye, α is the angle between the line of sight and the direction of incidence of the glare source light, K is a constant, depending on the unit of α, when α is expressed in degrees, K is 10, when α is expressed in radians,K＝3×10-3，TI is relative threshold increment (%),
Optionally, the updating of the diameter of the preset steel wire of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier specifically includes:
increasing the diameter of the steel wires of the protective net, increasing the thickness of the wind screen, decreasing the aperture of the wind screen, or increasing the pore space of the wind screen.
A highway-railway flat-bed bridge operation safety comprehensive protection system comprises:
the height acquisition module of the anti-glare panel is used for acquiring the height of the anti-glare panel when the sight of a driver of a vehicle running on a highway is not influenced by glare generated by a headlamp of a railway locomotive;
the first judgment result acquisition module is used for judging whether the height of the anti-dazzle plate exceeds a height threshold value to obtain a first judgment result;
the first judgment result representation module is used for replacing the anti-dazzle plate with an anti-throwing net with a preset steel wire diameter or a wind barrier with a preset thickness and a preset aperture if the first judgment result represents that the anti-dazzle plate is positive;
the light transmission area proportion calculation module is used for calculating the light transmission area proportion of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier;
the glare limiting threshold increment determining module is used for determining the glare limiting threshold increment of each glare evaluation point on a straight line of the position where the glare influences the line of sight of a driver of a vehicle running on a highway to be worst by using an incapability glare evaluation method according to the light transmission area ratio;
the second judgment result acquisition module is used for judging whether the maximum value of the glare limit threshold increment of all the glare evaluation points exceeds the standard threshold of the glare limit threshold increment or not to obtain a second judgment result;
a second judgment result representing module, configured to select the anti-throwing net with the preset steel wire diameter or the wind barrier with the preset thickness and the preset aperture if the second judgment result represents that the net is not thrown;
an updating module, configured to update a preset steel wire diameter of the anti-throwing net, a preset thickness of the wind barrier, or a preset aperture of the wind barrier if the second determination result indicates yes, and return to the step of "calculating a light transmission area ratio of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier";
and the antiglare shield determination module is used for selecting the antiglare shield with the height if the first judgment result shows no.
Optionally, the antiglare shield height obtaining module includes:
a first antiglare plate height acquisition submodule for utilizing a formula
A second antiglare plate height acquisition submodule for utilizing a formulaCalculating the height x of the glare shield when the glare passing through the shield and striking the road does not affect at least the sight line of the driver driving on the outermost lane of the railway2；
A third glare prevention plate height determination submodule for converting x1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not influence the sight of a driver driving a vehicle on a highway;
wherein l1The distance between the anti-dazzle plate and the edge of the road shoulder at the far side of the road from the railway2Is the width of the road, delta l is the distance between the railway and the shoulder of the road, h0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
Optionally, the light-transmitting area ratio calculating module includes:
a light transmission area proportion calculation submodule of the anti-throwing net, which is used for utilizing a formula according to the preset steel wire diameter of the anti-throwing net when the anti-throwing net is selectedCalculating the light transmission area ratio R of the anti-throwing netL；
The wind barrier light transmission area proportion calculation submodule is used for utilizing a formula R 'according to the preset thickness and the preset aperture of the wind barrier when the wind barrier is selected'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L；
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,
Optionally, the glare limit threshold increment determining module includes:
the worst position straight line forming submodule is used for determining each glare evaluation point of glare influencing the sight of a driver of a vehicle running on a highway when two adverse conditions of a minimum transverse distance and a minimum relative height difference between the highway and the railway exist at the same time, and all the glare evaluation points form a worst position straight line;
an equivalent light curtain brightness determining submodule for utilizing a formula when an included angle between the sight line and the incident direction of the light of the glare source is in a range of 1.5-60 DEG
A glare limit threshold increment determination submodule for determining a threshold increment for a luminance in the background of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is usedDetermining a glare limit threshold increment TI of each glare evaluation point;
wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) generated by the glare source on the plane perpendicular to the line of sight in the eyes of the observer, α is the angle between the line of sight and the incident direction of the light of the glare source, K is a constant and depends on the unit of α, when α is represented by angle, K is 10, when α is represented by radian, K is 3 × 10-3，
Optionally, the update module includes:
and the updating submodule is used for increasing the diameter of the steel wire of the protective net, increasing the thickness of the wind barrier, reducing the aperture of the wind barrier or increasing the pore space of the wind barrier.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a substitution scheme when the height of the anti-dazzle plate exceeds a height threshold value, the anti-dazzle plate is replaced by an anti-throwing net or a wind barrier, so that the anti-throwing net or the wind barrier has an anti-dazzle function, the comprehensive protection of wind prevention, anti-dazzle and anti-throwing on the operation safety of a highway and railway flat-layer bridge is realized, and the blank of the comprehensive protection of the operation safety of the highway and railway flat-layer bridge is filled; the invention also provides a method for evaluating the anti-dazzle performance of the anti-throwing net and the wind barrier, the light transmission area proportion of the anti-throwing net or the wind barrier is calculated according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier, determining the glare limit threshold increment of each glare evaluation point on a straight line of the most unfavorable position of the sight of a driver of a vehicle running on a highway influenced by glare by using an incapability glare evaluation method according to the light transmission area ratio, when the maximum value of the glare limit threshold increment for all glare evaluation points exceeds the normative threshold of glare limit threshold increments, and updating the diameter of a preset steel wire of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier, and repeating the steps until the increment of the glare limiting threshold value does not exceed the standard threshold value, thereby filling the blank that no method for evaluating the anti-dazzle performance of the anti-throwing net and the wind barrier exists in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of calculating the height of a straight-line segment antiglare shield according to the prior art;
FIG. 2 is a flow chart of a comprehensive protection method for the operation safety of a highway-railway flat-bed bridge provided by the invention;
FIG. 3 is a schematic diagram of the thickness reduction factor of a wind barrier provided by the present invention;
FIG. 4 is a structural diagram of a comprehensive protection system for the operation safety of a highway-railway flat-bed bridge provided by the invention;
description of the symbols: the device comprises a 1-antiglare plate height acquisition module, a 2-first judgment result acquisition module, a 3-first judgment result representation module, a 4-light transmission area ratio calculation module, a 5-glare limit threshold increment determination module, a 6-second judgment result acquisition module, a 7-second judgment result representation module, an 8-updating module and a 9-antiglare plate determination module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a highway-railway flat-layer bridge operation safety comprehensive protection method and a highway-railway flat-layer bridge operation safety comprehensive protection system, so as to select protection facilities meeting anti-dazzle requirements and improve the highway-railway flat-layer bridge operation safety comprehensive protection.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a comprehensive protection method for the operation safety of a highway-railway flat-bed bridge, which comprises the following steps of:
s201, acquiring the height of the anti-dazzle plate when the glare generated by the head lamp of the railway locomotive does not affect the sight of a driver of a vehicle running on a highway, and calculating the height of the anti-dazzle plate, wherein the following two conditions need to be comprehensively considered:
firstly, the glare passing through the glare shield is ensured to at least reach the shoulder edge of the road on the far side away from the railway:
using formulasCalculating the height x of the glare shield when the glare passing through the glare shield strikes at least the edge of the shoulder of the road on the side farther from the railway1；
Secondly, the glare which is emitted to the road at least does not influence the sight of a driver who drives the vehicle on the outermost lane of the railway:
using formulas
X is to be1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not affect the sight of the driver of the vehicle running on the highway. In order to facilitate construction, the value of the anti-dazzle plate with the height rounded upwards is selected as the suggested height of the anti-dazzle plate.
Wherein l1The distance between the anti-dazzle plate and the edge of the road shoulder at the far side of the road from the railway2Is the width of the road, delta l is the distance between the railway and the shoulder of the road, h0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
Because glare produced by a railway locomotive carriage lamp also influences the sight of a driver of a vehicle running on a road, but the height of a window of a general railway locomotive is 1.65-1.8m and is lower than the height of a headlamp of the railway locomotive, the calculated height of an anti-dazzle plate corresponding to the carriage lamp is smaller than the height of the anti-dazzle plate corresponding to the headlamp, and therefore the condition of the carriage lamp can not be considered.
S202, judging whether the height of the anti-dazzle plate exceeds a height threshold value or not, and obtaining a first judgment result. In order to adjust the height of the dazzle prevention plate to the cross section ratio of the road, prevent the dazzle prevention plate from falling down on a traffic lane after collision, and reduce the oppressive feeling of driving, the height of the dazzle prevention plate is generally not more than 2m, and therefore, the height threshold value of the dazzle prevention plate is generally set to two meters.
S203, if the first judgment result shows that the anti-dazzle plate is the anti-throwing net with the preset steel wire diameter or the wind barrier with the preset thickness and the preset aperture, replacing the anti-dazzle plate with the anti-throwing net with the preset steel wire diameter.
If the anti-throwing net is designed in the preliminary design scheme of the highway-railway flat-layer bridge project, the anti-dazzle plate is preferentially replaced by the anti-throwing net; if the wind barrier is designed in the preliminary design scheme of the highway-railway flat-layer bridge project, the anti-dazzle plate is preferentially replaced by the wind barrier.
S204, calculating the light transmission area proportion of the anti-throwing net or the wind barrier according to the preset steel wire diameter of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier, and specifically comprising the following steps:
when the anti-throwing net is selected, the formula is utilized according to the preset steel wire diameter of the anti-throwing net
When the wind screen is selected, according to the preset thickness and the preset aperture of the wind screen, a formula R 'is utilized'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L；
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,
s205, determining a glare limit threshold increment of each glare evaluation point on a straight line of the most unfavorable position of the driver sight of a vehicle running on the highway influenced by glare by using an incapability glare evaluation method according to the light transmission area ratio, wherein the method specifically comprises the following steps:
when two adverse conditions of minimum transverse distance and minimum relative height difference between a road and a railway exist simultaneously, determining each glare evaluation point of which glare influences the sight of a driver of a vehicle running on the road, wherein all glare evaluation points form a line at the most adverse position, and the transverse distance and the height difference of the glare evaluation points on the line are the minimum values but the longitudinal distances are different, so that each longitudinal distance needs to be evaluated;
when the included angle between the sight line and the incident direction of the light of the glare source is in the range of 1.5-60 degrees, the formula is utilizedDetermining an equivalent light curtain luminance L for each glare evaluation point on a worst-case position linev；
In the background luminance range of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is usedDetermining a glare limit threshold increment TI of each glare evaluation point;
wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) generated by the glare source on the plane perpendicular to the line of sight in the eyes of the observer, α is the angle between the line of sight and the incident direction of the light of the glare source, and K is a constant and depends on unit αWhen α is represented by an angle, K is 10, and when α is represented by an arc, K is 3 × 10-3，
S206, judging whether the maximum value of the glare limit threshold increment of all the glare evaluation points exceeds the standard threshold of the glare limit threshold increment or not, and obtaining a second judgment result.
According to the road lighting technical conditions (GB/T24969-.
S207, if the second judgment result shows that the steel wire diameter is not the same as the first judgment result, selecting an anti-throwing net with a preset steel wire diameter or a wind barrier with a preset thickness and a preset aperture.
And S208, if the second judgment result shows that the diameter of the preset steel wire of the anti-throwing net, the preset thickness of the wind barrier or the preset aperture of the wind barrier is yes, the step of calculating the light transmission area ratio of the anti-throwing net or the wind barrier according to the diameter of the preset steel wire of the anti-throwing net or the preset thickness and the preset aperture of the wind barrier is returned.
If the second judgment result shows that the second judgment result exceeds the standard requirement value, the influence of the headlamp of the railway locomotive on the glare of the road is obvious, and a design scheme with a higher specification needs to be selected, and the method specifically comprises the following steps:
the diameter of the steel wire of the protective net is increased, the thickness of the wind barrier is increased, the aperture of the wind barrier is reduced or the pore space of the wind barrier is increased.
And evaluating the adjusted protective net or wind barrier again until the designed protective net or wind barrier meets the anti-dazzle requirement.
And S209, if the first judgment result shows no, selecting the anti-dazzle plate with the height.
The invention provides a substitution scheme that the height required by the anti-dazzle plate exceeds the standard, provides a method for evaluating the anti-dazzle performance of the wind barrier and the anti-throwing net, comprehensively considers the arrangement of protective facilities such as wind prevention, anti-dazzle and anti-throwing, and fills the blank that the conventional method does not have comprehensive protection on the operation safety of a highway-railway flat-layer bridge.
The invention also provides a highway-railway flat-bed bridge operation safety comprehensive protection system, as shown in fig. 4, the protection system comprises: the device comprises an anti-dazzle plate
The anti-glare panel
And the first judgment
And the first judgment
And the light transmission area
And the glare limit threshold
And the second judgment
And the second judgment
And the updating
And the antiglare
Antiglare panel
A first antiglare plate height acquisition submodule for utilizing a formulaCalculating the height x of the glare shield when the glare passing through the glare shield strikes at least the edge of the shoulder of the road on the side farther from the railway1。
A second antiglare plate height acquisition submodule for utilizing a formula
A third glare prevention plate height determination submodule for converting x1And x2The larger value of the height of the glare shield is used as the height of the glare shield when the glare generated by the head lamp of the railway locomotive does not affect the sight of the driver of the vehicle running on the highway.
Wherein l1The distance between the anti-dazzle plate and the edge of the road shoulder at the far side of the road from the railway2Is the road width,. DELTA.lDistance between railway and road shoulder0The height of the headlamp of the railway locomotive, delta h is the height difference between the railway and the road, l3The distance between the center line of the lane of the road farthest from the railway and the anti-dazzle board at the side of the railway4Distance h from the antiglare shield on the side of the railway to the center line of the railway1Is the driver's sight height.
The light transmission area
A light transmission area proportion calculation submodule of the anti-throwing net, which is used for utilizing a formula according to the preset steel wire diameter of the anti-throwing net when the anti-throwing net is selected
The light transmission area proportion calculation submodule of the wind barrier is used for utilizing a formula R 'according to the preset thickness and the preset aperture of the wind barrier when the wind barrier is selected'LCalculating a light transmission area ratio R 'of the wind screen ═ T × M'L。
Wherein L is1、L2Respectively the length and the width of meshes of the anti-throwing net, r is the diameter of a steel wire, theta is an oblique angle, T is the proportion of pore area,s is the pore area, s ═ n pi (R/2)2R is the preset aperture of the wind barrier, n is the number of pores, S is the area of the wind barrier, M is the thickness reduction coefficient,
Glare limit threshold
The worst position straight line forming submodule is used for determining each glare evaluation point of glare influencing the sight of a driver of a vehicle running on a highway when two adverse conditions of a minimum transverse distance and a minimum relative height difference between the highway and the railway exist at the same time, and all the glare evaluation points form a worst position straight line;
an equivalent light curtain brightness determining submodule for utilizing a formula when an included angle between the sight line and the incident direction of the light of the glare source is in a range of 1.5-60 DEG
A glare limit threshold increment determination submodule for determining a threshold increment for a luminance in the background of 0.05cd/m2-5cd/m2According to the equivalent light curtain brightness, the formula is usedThe glare limit threshold increment TI for each glare evaluation point is determined.
Wherein L isvIs the equivalent luminance of light screen (cd/m)2)，ECIIs the illuminance (Ix) generated by the glare source on the plane perpendicular to the line of sight in the eyes of the observer, α is the angle between the line of sight and the incident direction of the light of the glare source, K is a constant and depends on the unit of α, when α is represented by angle, K is 10, when α is represented by radian, K is 3 × 10-3，
An
And the updating submodule is used for increasing the diameter of the steel wire of the protective net, increasing the thickness of the wind barrier, reducing the aperture of the wind barrier or increasing the pore space of the wind barrier.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
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