阅读说明：本技术 液态危化品泄漏桥面感应检测预警装置 (Bridge floor induction detection early warning device for liquid dangerous chemical leakage ) 是由 郭健 陶行行 于 2019-08-12 设计创作，主要内容包括：液态危化品泄漏桥面感应检测预警装置,一级检测预警单元设置在桥面每个泄水口旁边的行车道外侧实线旁；二级检测预警单元设置在每个泄水口四周并半埋入式地环绕布设；一级检测预警单元、二级检测预警单元位于桥面径流的流道上,其中一级检测预警单元位于上游；一级检测预警单元包括液体介电常数检测传感器、预存有雨雪介电常数的第一存储模块、第一CPU处理模块、第一无线通信模块和第一保护外壳；二级检测预警单元包括液体电导率检测传感器、PH值检测传感器、液体密度检测传感器、预存有检测指标正常值的第二存储模块、第二CPU处理模块、第二无线通信模块和第二保护外壳。(The liquid hazardous chemical leakage bridge floor induction detection early warning device is characterized in that a primary detection early warning unit is arranged beside a solid line on the outer side of a traffic lane beside each water outlet of the bridge floor; the secondary detection early warning unit is arranged around each water outlet and is arranged in a semi-embedded mode in a surrounding mode; the primary detection early warning unit and the secondary detection early warning unit are positioned on a flow channel of the deck runoff, wherein the primary detection early warning unit is positioned at the upstream; the first-stage detection early warning unit comprises a liquid dielectric constant detection sensor, a first storage module, a first CPU (central processing unit) processing module, a first wireless communication module and a first protection shell, wherein the first storage module is pre-stored with a rain and snow dielectric constant; the secondary detection early warning unit comprises a liquid conductivity detection sensor, a PH value detection sensor, a liquid density detection sensor, a second storage module in which a detection index normal value is prestored, a second CPU processing module, a second wireless communication module and a second protective shell.)

1. Bridge floor response detection early warning device is leaked to liquid state danger article, its characterized in that: the primary detection early warning unit is arranged beside a solid line on the outer side of a traffic lane beside each water outlet of the bridge floor; the secondary detection early warning unit is arranged around each water outlet and is arranged in a semi-embedded mode in a surrounding mode; the primary detection early warning unit and the secondary detection early warning unit are positioned on a flow channel of the deck runoff, wherein the primary detection early warning unit is positioned at the upstream;

the primary detection early warning unit comprises a liquid dielectric constant detection sensor, a first storage module in which a rain and snow dielectric constant is pre-stored, a first CPU (central processing unit) processing module, a first wireless communication module and a first protective shell; when the leaked liquid of the bridge floor flows into the first-stage detection early warning unit, the leaked liquid firstly contacts the liquid dielectric constant detection sensor and detects the dielectric constant of the leaked liquid, data are transmitted to the first CPU processing module after detection, the first CPU processing module compares the dielectric constant of the leaked liquid of the bridge floor with the rain and snow dielectric constant prestored in the first storage module, and if the difference between the dielectric constant of the leaked liquid of the bridge floor and the rain and snow dielectric constant is larger than or equal to a threshold value, the first CPU processing module instructs the first wireless communication module to send out an early warning signal; if the difference between the dielectric constant of the liquid leaked from the bridge deck and the dielectric constant of rain and snow is smaller than the threshold value, the first CPU processing module instructs the first wireless communication module to send an inlet and outlet valve opening signal to the second wireless communication module of the secondary detection early warning unit;

the secondary detection early warning unit comprises a liquid conductivity detection sensor, a PH value detection sensor, a liquid density detection sensor, a second storage module in which a detection index normal value is prestored, a second CPU processing module, a second wireless communication module and a second protective shell; the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor are arranged at an inlet valve of the secondary detection early warning unit and are respectively connected with the second CPU processing module; the control end of the inlet valve is connected with the second CPU processing module, and the inlet valve is arranged at the middle points of the four sides of the protective shell; when the second wireless communication module receives the inlet valve opening signal transmitted by the first wireless communication module, the second CPU processing module instructs to control the inlet valve to open; and after the inlet valve is opened, the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor detect the bridge deck leaked liquid, and when the difference between the detection values of the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor and the normal value stored in the second storage module is greater than a threshold value, the second CPU processing module instructs the second wireless communication module to send out an early warning signal.

2. The liquid dangerous chemical leakage bridge floor induction detection early warning device of claim 1, characterized in that: the outer shape of the second-stage detection early warning unit is groove-shaped, the second-stage detection early warning unit is arranged around the water discharge opening, the sensor group is arranged in the protective shell, in order not to influence water discharge, the second-stage detection early warning unit adopts a semi-embedded arrangement mode according to the slope around the water discharge opening, and the part of the protective shell, which is higher than the bridge deck, does not influence the water discharge of the bridge deck.

Technical Field

The invention relates to a bridge floor detection early warning system capable of detecting leakage of liquid hazardous chemicals.

Background

Along with the transportation of dangerous chemicals across the river bridges, the transportation is more and more frequent, the types of the dangerous chemicals are more and more complicated, once a transportation leakage accident occurs, the serious pollution can be caused to the water environment under the bridges, and especially for the river-crossing and sea-crossing bridges, the ecological safety can be seriously damaged. The emergency time of dangerous chemical leakage accidents is urgent, so that emergency measures are required to be simple and effective to operate, and the application range is wide. Therefore, a measure for detecting and early warning dangerous chemicals leaked from the bridge deck in advance is necessary.

Bridge deck runoff detecting system of the highway bridge of design at present mostly sets up in the pipeline of discharge opening below, and the not enough that current bridge deck runoff detection device exists is: 1. aiming at the reasons of bridge bearing, span length, driving safety, collecting tank capacity, collecting tank construction site and the like of the river-crossing and sea-crossing bridge, a bridge deck runoff collecting device cannot be installed, so that bridge deck runoff is directly discharged, and the detection mode in a drainage pipeline is difficult to realize. 2. Aiming at the mode of directly discharging a cross-river and cross-sea bridge, the conventional detection device for hazardous chemical substance liquid in a detection pool and a collection pool is difficult to install, and after raining each time, the runoff water on the bridge floor collected by the collection pool needs to be manually and periodically discharged, so that the bridge floor has sufficient volume to accommodate the possible dangerous chemical substance leakage. If the collecting tank is not emptied in time, the collecting tank loses collecting significance. 3. The current bridge deck runoff collecting system is not easy to overhaul and replace. 4. The leakage of dangerous chemicals cannot be detected immediately on the bridge floor, and the bridge floor has delay and potential safety hazards.

Disclosure of Invention

The invention provides a bridge floor induction detection early warning device for liquid hazardous chemical leakage, which overcomes the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to the bridge floor induction detection early warning device for the leakage of the liquid hazardous chemical, a primary detection early warning unit is arranged beside a solid line on the outer side of a traffic lane beside each water outlet of the bridge floor; the secondary detection early warning unit is arranged around each water outlet and is arranged in a semi-embedded mode in a surrounding mode; the primary detection early warning unit and the secondary detection early warning unit are positioned on a flow channel of the deck runoff, wherein the primary detection early warning unit is positioned at the upstream;

the primary detection early warning unit comprises a liquid dielectric constant detection sensor, a first storage module in which a rain and snow dielectric constant is pre-stored, a first CPU (central processing unit) processing module, a first wireless communication module and a first protective shell; when the leaked liquid of the bridge floor flows into the first-stage detection early warning unit, the leaked liquid firstly contacts the liquid dielectric constant detection sensor and detects the dielectric constant of the leaked liquid, data are transmitted to the first CPU processing module after detection, the first CPU processing module compares the dielectric constant of the leaked liquid of the bridge floor with the rain and snow dielectric constant prestored in the first storage module, and if the difference between the dielectric constant of the leaked liquid of the bridge floor and the rain and snow dielectric constant is larger than or equal to a threshold value, the first CPU processing module instructs the first wireless communication module to send out an early warning signal; if the difference between the dielectric constant of the liquid leaked from the bridge deck and the dielectric constant of rain and snow is smaller than the threshold value, the first CPU processing module instructs the first wireless communication module to send an inlet and outlet valve opening signal to the second wireless communication module of the secondary detection early warning unit;

the secondary detection early warning unit comprises a liquid conductivity detection sensor, a PH value detection sensor, a liquid density detection sensor, a second storage module in which a detection index normal value is prestored, a second CPU processing module, a second wireless communication module and a second protective shell; the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor are arranged at an inlet valve of the secondary detection early warning unit and are respectively connected with the second CPU processing module; the control end of the inlet valve is connected with the second CPU processing module, and the inlet valve is arranged at the middle points of the four sides of the protective shell; when the second wireless communication module receives the inlet valve opening signal transmitted by the first wireless communication module, the second CPU processing module instructs to control the inlet valve to open; and after the inlet valve is opened, the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor detect the bridge deck leaked liquid, and when the difference between the detection values of the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor and the normal value stored in the second storage module is greater than a threshold value, the second CPU processing module instructs the second wireless communication module to send out an early warning signal.

Preferably, the outer shape of the second-stage detection early-warning unit is a groove shape, the groove shape is arranged around the water discharge opening, the sensor group is arranged in the protective shell, in order to avoid influence on water discharge, the second-stage detection early-warning unit adopts a semi-embedded arrangement mode according to the gradient around the water discharge opening, and the part of the protective shell, which is higher than the bridge deck, does not influence on water discharge of the bridge deck.

The invention has the advantages that: the bridge deck induction detection early warning device for the leakage of the liquid dangerous chemicals can quickly detect the leakage of the dangerous chemicals on the bridge deck and quickly early warn before the liquid dangerous chemicals flow into the water drainage port; the bridge deck detection early warning device is convenient to install, replace and maintain, and is beneficial to application and popularization; the valve is automatically opened and closed through a built-in sensing system; the induction detection early warning device can realize the graded rapid detection and early warning of the bridge deck, can win the precious time for the emergency treatment of bridge management departments, and can effectively delay the leakage of liquid hazardous chemicals to flow into the river sea area.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and the drawings in the following description are only some embodiments of the present invention.

FIG. 1a is a side view of a primary detection and forewarning unit of the present invention;

FIG. 1b is a top view of the primary detection and warning unit of the present invention;

FIG. 2 is a schematic structural diagram of a secondary detection early warning unit;

FIG. 3 is a diagram of the arrangement position of the secondary detection early warning unit on the bridge deck;

FIG. 4 is a detection flow chart of the primary detection early warning unit of the present invention;

FIG. 5 is a detection flow chart of the secondary detection early warning unit of the present invention;

fig. 6 is a system configuration diagram of the present invention.

In the figure: 1. a first-stage detection early warning unit; 2. a secondary detection early warning unit; 3. a bridge floor drain outlet; 11. a first-stage detection early warning unit sensor group; 12. a first protective housing; 21. a second-level detection early warning unit sensor group; 22. a second protective housing; 23. a liquid guide pipe in the secondary detection early warning unit; 24. the inlet of the secondary detection early warning unit controls a valve;

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

As shown in fig. 1, the bridge deck induction detection early warning device for liquid hazardous chemical leakage comprises a primary detection early warning unit 1 and a secondary detection early warning unit 2;

the primary detection early warning unit 1 comprises a liquid dielectric constant detection sensor 11, a first storage module in which normal rain and snow dielectric constant index values are prestored, a first CPU (central processing unit) processing module, a first wireless communication module and a first protective shell 12;

the secondary detection early warning unit comprises a liquid conductivity sensor, a PH value detection sensor, a secondary detection early warning unit sensor group 21 of a liquid density detection sensor, a second storage module pre-storing a normal liquid detection index value, a second CPU processing module, a second wireless communication module, a second protective shell 22 and a liquid guide pipe 23 in the secondary detection early warning unit;

the secondary detection early warning unit 2 is arranged around each water outlet of each section, and each primary detection early warning unit 1 is arranged beside a solid line on the outer side of the traffic lane near each water outlet; when the leaked liquid of the bridge floor flows into the first-stage detection early warning unit, the bridge floor firstly contacts the liquid dielectric constant detection sensor 11 and detects the dielectric constant of the leaked liquid, data are transmitted to the first CPU processing module after detection, the first CPU processing module compares the dielectric constant of the leaked liquid of the bridge floor with the normal sleet dielectric constant prestored in the first storage module, if the difference between the dielectric constant of the leaked liquid of the bridge floor and the sleet dielectric constant is more than or equal to a threshold value, the first CPU processing module instructs the first wireless communication module to send out an early warning signal, and then the emergency management department of the bridge carries out emergency treatment; if the difference between the dielectric constant of the liquid leaked from the bridge deck and the dielectric constant of rain and snow is smaller than the threshold value, the first CPU processing module instructs the first wireless communication module to send an opening signal of the inlet control valve to the second wireless communication module of the secondary detection early warning unit;

when the second wireless communication module receives the opening signal of the inlet control valve transmitted by the first wireless communication module, the second CPU processing module instructs the inlet control valve to open; the bridge deck leakage liquid is detected by the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor after the inlet control valve is opened, when the difference between the detection values of the liquid conductivity detection sensor, the PH value detection sensor and the liquid density detection sensor and the pre-stored normal value is larger than a preset threshold value, the second CPU processing module instructs the second wireless communication module to send out an early warning signal, and then emergency disposal is carried out by a bridge emergency management department.

The working principle of the invention is briefly described as follows:

the first storage module of the first-stage detection early warning unit 1 stores normal dielectric constant values close to rain and snow, only a few hazardous chemical substances close to the dielectric constant of water are stored, and the dielectric constants of other liquid hazardous chemical substances are greatly different from that of common liquid such as water;

secondly, the detection principle of the liquid hazardous chemical detection early warning unit is briefly described as follows:

1. the detection of the conductivity in the sensor group of the secondary detection early warning unit mainly detects liquid hazardous chemical substances and solid hazardous chemical substances dissolved in rainwater, and makes up for hazardous chemical substances which are close to the dielectric constant of normal rain and snow and cannot be detected through the dielectric constant; the PH value detection sensor is mainly used for detecting chemical dangerous goods with strong acid and strong alkali characteristics, and as the conductivity of the liquid is detected in the secondary detection early warning unit sensor group, the conductivity of the liquid is increased when the pH value of the liquid is higher, the PH value detection is an alternative detection parameter of the invention; considering that precipitation in different areas and soil on a bridge have different properties, a liquid density detection sensor is selected;

2. the sensor group in the secondary detection early warning unit is arranged at the inlet control valve at the middle position of four sides in the protective shell, the detection is carried out immediately after the inlet control valve opens the liquid to flow in, and the liquid flows to the flow guide pipes at two sides after the detection is finished;

3. the distance setting between the primary detection early warning unit flow and the secondary detection early warning unit is set according to the time of liquid flowing from the primary detection early warning unit flow to the secondary detection early warning unit, and the calculation basis is as follows:

T₁＝t₁+t₂

t₁the time for liquid at the bridge deck transverse primary detection early warning unit device to flow to the secondary detection early warning unit device is related to the width and the cross slope; t is t₂The time for the water flow at the farthest position of the longitudinal water collection point to reach the first water discharge opening is related to the form of the water discharge section and the longitudinal slope. The water flow in the process of transverse cross flow of the bridge deck is shallow by adopting a formula

m₁The surface roughness coefficient; i.e. i_hIs a cross slope of the bridge deck. The longitudinal convergence time is calculated as

v_vIn order to obtain the average longitudinal water-collecting flow velocity,

i_vis a bridge deck longitudinal slope; l is₁The distance from the farthest position of the longitudinal water converging point to the first water discharge opening.

4. The time T from the liquid flowing into the secondary detection early warning unit to the full overflow of the draft tube₂According to the formula

v_pThe flow rate of the liquid flowing into the flow guide pipe 23, s is the length of the pipe section, alpha is the flow rate gradient calculation coefficient, i_pThe inner slope of the pipeline.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.