CN110609063A - Bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals - Google Patents

Abstract

The bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals. The first-level detection and early-warning unit is set up beside the solid line on the outer side of the carriageway next to each water outlet on the bridge deck; the secondary detection and early-warning unit is set around each water outlet and semi-buried The primary detection and early warning unit and the secondary detection and early warning unit are located on the flow channel of the bridge deck runoff, and the primary detection and early warning unit is located upstream. The dielectric constant of the first storage module, the first CPU processing module, the first wireless communication module and the first protective shell; the secondary detection and early warning unit includes a liquid conductivity detection sensor, a PH value detection sensor, a liquid density detection sensor, a pre-stored A second storage module, a second CPU processing module, a second wireless communication module and a second protective casing for detecting the normal value of the index.

Description

Bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals

technical field

The present invention is a bridge deck detection and early warning system capable of detecting leakage of liquid hazardous chemicals.

Background technique

As the transportation of hazardous chemicals across the sea and river bridges becomes more and more frequent, the types of hazardous chemicals are becoming more and more complicated. Once a transportation leakage accident occurs, it will cause serious pollution to the water environment under the bridge, especially for cross-river and sea-crossing. For bridges, it will seriously endanger ecological security. The emergency response time for the leakage of hazardous chemicals is urgent, so the emergency measures are required to be simple, effective and widely applicable. Therefore, it is necessary to make early detection and early warning measures for the hazardous chemicals leaked from the bridge deck.

At present, most of the bridge deck runoff detection systems designed for highway bridges are installed in the pipeline below the water outlet. The shortcomings of the existing bridge deck runoff detection devices are: 1. For the bridge load-bearing, span length, traffic flow of the bridge across the river and the sea Due to reasons such as safety, the capacity of the collection pond, and the construction site of the collection pond, it is impossible to install the bridge deck runoff collection device, so that the bridge deck runoff adopts the "straight discharge" method, so it is difficult to realize the detection method in the drainage pipeline. 2. In view of the direct discharge method of cross-river and sea-crossing bridges, it is difficult to install the liquid detection devices for hazardous chemicals in the current detection pool and collection pool. Sufficient volume to contain possible leakage of dangerous goods. If the collection tank is not emptied in time, the collection tank loses its meaning of collection. 3. The current bridge deck runoff collection system is not easy to repair and replace. 4. The leakage of hazardous chemicals cannot be detected immediately on the bridge deck, which is delayed and has potential safety hazards.

SUMMARY OF THE INVENTION

The present invention aims to overcome the above shortcomings of the prior art, and provides an inductive detection and early warning device for the leakage of liquid hazardous chemicals on a bridge deck.

To achieve the above object, the present invention adopts the following technical solutions:

In the bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals according to the present invention, the primary detection and early warning unit is arranged beside the solid line on the outer side of the traffic lane beside each water outlet of the bridge deck; the secondary detection and warning unit is arranged at each water outlet It is surrounded by semi-buried and surrounded; the first-level detection and early warning unit and the second-level detection and early-warning unit are located on the flow channel of the bridge deck runoff, and the first-level detection and early-warning unit is located upstream;

The first-level detection and early warning unit includes a liquid permittivity detection sensor, a first storage module pre-stored with rain and snow permittivity, a first CPU processing module, a first wireless communication module and a first protective casing; when the bridge deck leaks When the liquid flows into the first-level detection and early warning unit, it first contacts the liquid dielectric constant detection sensor and detects the dielectric constant of the leaking liquid. After detection, the data is transmitted to the first CPU processing module. The first CPU processing module compares the bridge deck leakage liquid If the difference between the dielectric constant of the bridge deck leakage liquid and the rain and snow dielectric constant is greater than or equal to the threshold, the first CPU processing module instructs the first wireless communication The module sends out an early warning signal; if the difference between the dielectric constant of the leaked liquid on the bridge deck and the dielectric constant of rain and snow is less than the threshold, the first CPU processing module instructs the first wireless communication module to send an entrance to the second wireless communication module of the secondary detection and warning unit valve open signal;

The secondary detection and early warning unit includes a liquid conductivity detection sensor, a pH value detection sensor, a liquid density detection sensor, a second storage module pre-stored with normal values of detection indicators, a second CPU processing module, a second wireless communication module and a second storage module. protective casing; the liquid conductivity detection sensor, pH value detection sensor, and liquid density detection sensor are arranged at the inlet valve of the secondary detection and early warning unit, and are respectively connected to the second CPU processing module; the control end of the inlet valve is connected to the second CPU processing module, the inlet valve is arranged at the midpoint of the four sides of the protective casing; 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 the control inlet valve to open; After the inlet valve is opened, the liquid conductivity detection sensor, PH value detection sensor, and liquid density detection sensor detect the leakage liquid on the bridge deck. When the detection value of the liquid conductivity detection sensor, pH value detection sensor, and liquid density detection sensor is stored When the difference between the normal values stored in the modules is greater than the threshold, the second CPU processing module instructs the second wireless communication module to issue an early warning signal.

Preferably, the external shape of the secondary detection and early warning unit is a groove shape, which is arranged around the water outlet, and the sensor group is arranged in the protective shell. In order not to affect the drainage, the secondary detection and early warning unit adopts a semi-buried method according to the slope around the water outlet. The part of the protection shell that is higher than the bridge deck does not affect the drainage of the bridge deck.

The advantages of the present invention are: the bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals can quickly detect the leakage of hazardous chemicals on the bridge deck, and perform rapid warning before the liquid hazardous chemicals flow into the scupper; The bridge deck detection and early warning device is easy to install, replace and maintain, which is conducive to application and promotion; the valve realizes automatic opening and closing through the built-in sensing system; through the induction detection and early warning device, the bridge deck can be quickly detected and early warning by classification, which can win precious time for the bridge management department for emergency response. It can effectively delay the leakage of liquid hazardous chemicals into rivers and seas.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art, and the drawings in the following description are only the present invention. some examples.

1a is a side view of a first-level detection and warning unit of the present invention;

Fig. 1b is the top view of the first-level detection and warning unit of the present invention;

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

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

Fig. 4 is the detection flow chart of the first-level detection early warning unit of the present invention;

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

FIG. 6 is a system structure diagram of the present invention.

In the figure: 1. First-level detection and early warning unit; 2. Second-level detection and early-warning unit; 3. Bridge deck water outlet; 11. First-level detection and early-warning unit sensor group; Sensor group; 22. The second protective shell; 23. The liquid guide pipe in the secondary detection and early warning unit; 24. The inlet control valve of the secondary detection and early warning unit;

Detailed ways

The above scheme will be further described below in conjunction with specific embodiments. These examples are intended to illustrate the invention and not to limit the scope of the invention.

As shown in FIG. 1 , the bridge deck induction detection and early warning device for leakage of liquid hazardous chemicals according to the present invention includes a primary detection and pre-warning unit 1 and a secondary detection and pre-warning unit 2;

The first-level detection and early warning unit 1 includes a liquid dielectric constant detection sensor 11 , a first storage module pre-stored with normal rain and snow dielectric constant index values, a first CPU processing module, a first wireless communication module and a first protective casing 12 ;

The secondary detection and early warning unit includes a secondary detection and early warning unit sensor group 21 of a liquid conductivity sensor, a pH value detection sensor, and a liquid density detection sensor, a second storage module pre-stored with normal liquid detection index values, and a second CPU processing module. , the second wireless communication module, the second protective casing 22 and the liquid guide tube 23 in the secondary detection and early warning unit;

The secondary detection and early warning unit 2 is arranged around each water outlet of each section, and each primary detection and early warning unit 1 is arranged beside the solid line on the outer side of the carriageway near each water outlet; when the leakage liquid from the bridge deck flows into the primary When the early warning unit is detected, it first contacts the liquid dielectric constant detection sensor 11 and detects the dielectric constant of the leaked liquid, and then transmits the data to the first CPU processing module after detection, and the first CPU processing module compares the dielectric constant of the leaked liquid on the bridge deck. The constant and the normal rain and snow dielectric constant pre-stored in the first storage module, if the difference between the dielectric constant of the bridge deck leakage liquid and the rain and snow dielectric constant is greater than or equal to the threshold, the first CPU processing module instructs the first wireless communication module to send If the difference between the dielectric constant of the bridge deck leakage liquid and the dielectric constant of rain and snow is less than the threshold, the first CPU processing module instructs the first wireless communication module to detect the warning signal of the second-level warning unit. The second wireless communication module sends an inlet control valve opening signal;

When the second wireless communication module receives the inlet control valve opening signal transmitted by the first wireless communication module, the second CPU processing module instructs the inlet control valve to open; after the inlet control valve is opened, the liquid conductivity detection sensor, pH value detection sensor, The liquid density detection sensor detects the leaking liquid on the bridge deck. When the difference between the detection value of the liquid conductivity detection sensor, the pH value detection sensor, and the liquid density detection sensor and the pre-stored normal value is greater than the preset threshold, the second CPU processing module The second wireless communication module is instructed to issue an early warning signal, and then the bridge emergency management department conducts emergency response.

One, the working principle of the present invention is briefly described as follows:

The first storage module of the first-level detection and early warning unit 1 stores the normal dielectric constant value close to rain and snow. There are only a few types of hazardous chemicals close to the dielectric constant of water, and the dielectric constants of other liquid hazardous chemicals are The constant is very different from ordinary liquids such as water;

2. The detection principle of the liquid hazardous chemicals detection and early warning unit of the present invention is briefly described as follows:

1. The detection of conductivity in the sensor group of the secondary detection and early warning unit is mainly to detect the liquid hazardous chemicals and solid hazardous chemicals dissolved in rainwater, which makes up for the closeness to the dielectric constant of normal rain and snow, but cannot be detected by the dielectric constant. The PH value detection sensor is mainly used to detect chemical dangerous goods with strong acid and strong alkali characteristics. Due to the conductivity detection in the sensor group of the secondary detection and early warning unit, when the pH value of the liquid is high, the conductivity of the liquid It will also increase accordingly, so pH value detection is an optional detection parameter of the present invention; considering that the precipitation in different regions and the soil on the bridge have different properties, a liquid density detection sensor is selected as an option;

2. The sensor group in the secondary detection and early warning unit of the present invention is arranged on the inlet control valve in the middle of the four sides in the protective casing. When the inlet control valve is opened, the liquid flows in and the detection is carried out immediately. After the detection is completed, it flows to the guide pipes on both sides. ;

3. The distance setting from the primary detection and early warning unit to the secondary detection and early warning unit is set according to the time when the liquid flows from the primary detection and early warning unit to the secondary detection and early warning unit. The calculation basis is:

T ₁ =t ₁ +t ₂

t ₁ is the time for the liquid from the lateral primary detection and early warning unit device of the bridge deck to flow to the secondary detection and early warning unit device, which is related to the width and the transverse slope; t ₂ is the distance from the farthest longitudinal catchment point to the first water outlet. The time is related to the drainage section form and longitudinal slope. The water flow in the lateral flooding process of the bridge deck is very shallow, and the formula

m ₁ is the surface roughness coefficient; i _h is the transverse slope of the bridge deck. The longitudinal confluence time is calculated as

v _v is the average velocity of the vertical catchment,

i _v is the longitudinal slope of the bridge deck; L ₁ is the distance from the farthest longitudinal catchment point to the first water outlet.

4. The time T2 from when the liquid flows into the secondary detection and warning unit to the overflow of the diversion pipe is based on the _formula

v _p is the liquid flow velocity of the liquid flowing into the guide pipe 23 , s is the length of the pipe section, α is the calculation coefficient of the flow velocity gradient, and _ip is the slope set in the pipeline.

The content described in the embodiments of the present specification is only an enumeration of the realization forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present invention also extends to those skilled in the art. Equivalent technical means that can be conceived by a person based on the inventive concept.

Claims (2)

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.