CN115171340A - Cable tunnel flood backward flow risk early warning system - Google Patents

Abstract

The invention relates to an early warning system for flood backflow risk of a cable tunnel. The distance between the large hole and the inner bottom surface of the water flow convergence tank at the entrance of the cable tunnel is H1, and the distance between the small hole and the inner bottom surface of the water flow convergence tank at the cable tunnel entrance is H2. The distance between the inner bottom surface of the groove is H3, H1>H3>H2, and the area of the small hole is smaller than the area of the entrance of the cable tunnel. It can improve the early warning sensitivity of the flood sensor to the flood backflow of the cable tunnel.

Description

Cable Tunnel Flood Inversion Risk Warning System

technical field

The invention relates to the field of early warning of flood backflow risk in cable tunnels, in particular to an early warning system for flood backflow risk in cable tunnels.

Background technique

During flood control monitoring of cable tunnels, early detection of water entering the tunnel and treatment can avoid losses caused by flooding of the tunnel. Flood intrusion detection at the entrance of the tunnel, the current commonly used method is the cable-type flooding sensor or the ordinary probe-type flooding sensor. Cable-type flood sensors are prone to false alarms due to condensation in summer. Ordinary probe-type water immersion sensor is a point-type detection. When the two electrodes used for detection are submerged by water, it is detected that there is water. When the small water flow of the existing ordinary probe flood starts to pour into the tunnel at the early stage, it is easy to fail to detect it, and the opportunity to detect and deal with the water inflow in the tunnel as soon as possible is missed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an early warning system for flood backflow risk in cable tunnels, so as to improve the early warning sensitivity of flood sensors to flood backflow in cable tunnels.

The technical scheme of the present invention is:

A cable tunnel flood inversion risk early warning system, comprising a cable tunnel inlet water flow converging groove set below the lower edge of the cable tunnel entrance, large holes and small holes are arranged on the side of the cable tunnel entrance water flow converging groove, and the large hole is provided. The distance from the inner bottom surface of the water flow convergence tank at the entrance of the cable tunnel is H1, the distance between the small hole and the inner bottom surface of the water flow convergence tank at the entrance of the cable tunnel is H2, and the sensitive head of the water immersion sensor is installed in the water flow convergence tank from the cable tunnel entrance. The distance from the bottom surface is H3, H1>H3>H2, and the area of the small hole is smaller than the area of the entrance of the cable tunnel.

Preferably, H2 is 1mm˜2mm.

Preferably, the diameter of the large hole is 10 mm, and the diameter of the small hole is 2 mm.

Preferably, H3=H2+1mm, H1=H3+5mm.

Preferably, it also includes a control processor and an output device, the output end of the water immersion sensor is electrically connected to the input end of the control processor, and the control processor is electrically connected to the output device.

The beneficial effects of the present invention are:

1. The water flow convergence tank at the entrance of the cable tunnel is set lower than the lower edge of the cable tunnel entrance, so that the water flow convergence tank at the entrance of the cable tunnel can accumulate water, and the time for the accumulated water to submerge the flood sensor is advanced, thereby improving the water flood sensor's ability to flood the cable tunnel. Early warning sensitivity. By setting the distance between the large hole and the inner bottom surface of the water flow collecting tank at the entrance of the cable tunnel as H1, H1>H3, the water flow gathered in the water flow collecting tank at the cable tunnel entrance can be quickly discharged after the water flow at the cable tunnel entrance subsides. By setting the distance between the small holes The distance between the inner bottom surface of the water flow collecting tank at the entrance of the cable tunnel is H2, and the distance between the sensing head of the water immersion sensor and the inner bottom surface of the water flow collecting tank at the entrance of the cable tunnel is H3, H3>H2, so that the cable tunnel can be made through the small hole The liquid level in the inlet water converging tank is lower than the position of the sensitive head of the water immersion sensor to realize the function of no water stop alarm.

Description of drawings

Figure 1 is a reference diagram of the use state of a cable tunnel flood inversion risk early warning system.

FIG. 2 is a schematic structural diagram of a cable tunnel flood inversion risk early warning system.

Description of reference numerals, 1-cable tunnel inlet, 2-cable tunnel inlet water flow converging tank, 21-small hole, 22-large hole, 23-water immersion sensor.

Detailed ways

Below in conjunction with the accompanying drawings, the present invention will be described in the form of embodiments to assist those skilled in the art to understand and implement the present invention. Unless otherwise specified, the following embodiments and technical terms therein should not be understood without departing from the background of technical knowledge in the technical field.

Embodiment 1: A cable tunnel flood inversion risk warning system, comprising a cable tunnel inlet water flow convergence tank 2 set below the lower edge of the cable tunnel entrance 1, and a large hole 22 and a small hole 22 are provided on the side of the cable tunnel entrance water flow convergence tank 2. The distance between the hole 21 and the large hole 22 is H1 from the inner bottom surface of the water flow convergence tank 2 at the entrance of the cable tunnel, and the distance between the small hole 21 and the inner bottom surface of the water flow convergence tank 2 at the entrance of the cable tunnel is H2. The distance from the inner bottom surface of the water flow convergence tank 2 at the entrance of the cable tunnel is H3, H1>H3>H2, and the area of the small hole 21 is smaller than the area of the cable tunnel entrance 1.

In this embodiment, H2 is 1 mm˜2 mm.

In this embodiment, the diameter of the large hole is 10 mm, and the diameter of the small hole is 2 mm.

In this embodiment, H3=H2+1mm, H1=H3+5mm.

In this embodiment, the cable tunnel flood risk warning system further includes a control processor and an output device, the output end of the flood sensor is electrically connected to the input end of the control processor, and the control processor is connected to the output end Equipment electrical connection.

When a small water flow enters the tunnel through the entrance of the cable tunnel, it first flows into the water flow collecting tank at the entrance of the cable tunnel. Due to the small holes in the water flow collecting tank at the entrance of the cable tunnel, the water in the tank flows out slowly. When the flow rate of water at the entrance of the tunnel is greater than the flow rate of the small holes of the water converging tank at the entrance of the cable tunnel, the water level in the tank rises. When the water immersion sensor probe is submerged by water, the water immersion sensor can detect the presence of water. When the water flow into the cable tunnel stops, the water in the water flow collecting tank at the entrance of the cable tunnel will flow out of the water tank from the large and small holes. When the water level is lower than the lower edge H1 of the large hole, the remaining water will slowly flow out through the small hole. When the water level is lower than H3, the two electrodes of the water immersion sensor probe are separated from the water, and the water immersion sensor judges that there is no water. The water in the water flow collecting tank at the entrance of the cable tunnel continues to flow out of the small hole until the water level reaches the height of H2.

The present invention has been described in detail above with reference to the accompanying drawings and embodiments. It should be understood that all possible implementations cannot be exhaustively described in practice, and the inventive concept of the present invention is explained as much as possible by way of illustration. Without departing from the inventive concept of the present invention and without creative work, those skilled in the art can choose and combine the technical features in the above-mentioned embodiments, make experimental changes to the specific parameters, or use existing technologies in the technical field. The specific embodiments formed by conventional replacement of the disclosed technical means of the present invention shall belong to the implicitly disclosed contents of the present invention.

Claims (5)

1. The utility model provides a cable tunnel flood flows backward risk early warning system which characterized in that, includes and is less than cable tunnel entry lower edge cable tunnel entry rivers that set up and assembles the groove the side that cable tunnel entry rivers assembled the groove is equipped with macropore and aperture, the distance that the interior bottom surface of macropore distance cable tunnel entry rivers assembled the groove is H1, the distance that the interior bottom surface of aperture distance cable tunnel entry rivers assembled the groove is H2, and the distance that the sensitive head of water sensor was installed at the interior bottom surface of apart from cable tunnel entry rivers assembled the groove is H3, and H1 > H3 > H2, the aperture area is less than cable tunnel entry area.

2. The cable tunnel flood backflow risk early warning system of claim 1, wherein H2 is 1mm to 2mm.

3. The cable tunnel flood backflow risk early warning system of claim 1, wherein the large holes are 10mm in diameter, and the small holes are 2mm in diameter.

4. The flood backflow risk early warning system for cable tunnels as claimed in claim 1, wherein H3= H2+1mm, and h1= h3+5mm.

5. The cable tunnel flood risk early warning system of claim 1, further comprising a control processor and an output device, wherein an output of the water sensor is electrically connected to an input of the control processor, and the control processor is electrically connected to the output device.

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