CN207297064U - A kind of construction ventilation of tunnel flexible duct real-time detection system for state - Google Patents

Abstract

The utility model discloses a real-time detection system for the status of flexible air ducts for tunnel construction ventilation. Wind speed monitoring points are set between every 3 to 5 flexible air ducts to complete information collection and uploading; the wind speed monitoring points are composed of detection nodes, WIFI networks and The server is composed of; the server completes the storage and release of data, and the WIFI network connects the node and the server; the wind speed monitoring point between every 3 to 5 flexible air ducts is correspondingly installed with a detection node, the detection node is a two-layer structure, and the detection node The outer layer is the same vinylon tape as the flexible air duct, with zippers on both ends for easy connection with the flexible air duct; the inner layer is made of hard plastic, where the wind speed sensor probe or wind pressure detection hose is installed; at the upper right of the detection node Or there is a sealed hook on the upper left to facilitate the installation of the detection node; the output signal of the wind speed sensor probe in the detection node is connected to the main circuit of the sensor suspended and fixed outside the detection node, and the wind pressure detection hose is connected to the wind pressure sensor in the main circuit of the sensor.

Description

A real-time detection system for the status of tunnel construction ventilation flexible air duct

technical field

The utility model relates to the state monitoring of tunnel construction ventilation pipes, in particular to a leak point detection and air pipe state monitoring system for tunnel construction ventilation flexible air pipes.

Background technique

Tunnel construction ventilation system is an important part of tunnel engineering, which ensures the working environment inside the entire tunnel during tunnel construction. The composition principle of tunnel construction ventilation system is shown in Figure 1. The entire tunnel construction area is divided into two parts: the inclined shaft (or the horizontal tunnel, depending on the specific terrain. Hereinafter, it is simply called the inclined shaft) and the main tunnel. The ventilation fan is located at the mouth of the inclined well, and the fresh air outside the cave is sent to the working face through the air duct. After the fresh air enters the tunnel face, the polluted air in the construction tunnel is taken out along the main tunnel and the inclined shaft, so as to ensure that the air in the construction tunnel meets the requirements of the regulations. In the ventilation process shown in Figure 1, vinylon tape ducts are often used as ventilation ducts. The air duct has the characteristics of low wind resistance coefficient, low air leakage rate, and convenient transportation and installation. The flexible air duct is generally 20 meters into a section, and the sections are connected by zippers. The zipper is sealed to ensure that the air volume output by the fan can be transported to the palm surface to the maximum extent. The output wind pressure of the fan must be able to overcome the wind resistance of the entire air duct. The air volume output by the fan will have a certain normal loss during the transmission process of the entire air duct.

During the actual installation process of the air duct, it has to pass through the possible maintenance bench, the second lining bench and the waterproof board bench in turn, sometimes causing certain damage to the air duct. On the other hand, passing vehicles will also cause accidental trauma to the air duct, resulting in air leakage. If the air leakage of the branch pipe is not discovered in time, it will seriously affect the efficiency of the entire ventilation system. In the current actual work, the ventilator needs to patrol along the air duct frequently, mainly relying on the hearing of the ear to find the position of the air leakage on the air duct, and to deal with it accordingly. However, the tunnel construction environment is harsh and noisy, and even experienced ventilators will inevitably miss some important air leakage points. Moreover, the length of the air duct is often several thousand meters, and a large number of patrol work takes up a lot of time for the ventilator.

At present, the detection methods disclosed in the literature are all offline detection (test phase). For example, the light detection method needs to use wires to pass the incandescent lamp through the entire air duct, and manually observe the air leakage position of the air duct; if the air blower and static pressure sensor are used to control the internal pressure of the air duct to 700Pa, then manually observe the air leakage sound of the air duct; For example, install a smoke generating device in the air duct, and use a fan to increase the static pressure in the branch pipe, and observe whether there is smoke leakage from the air duct wall. These types of detection methods require the in-depth participation of personnel. It is not well suitable for online condition monitoring of tunnel construction ventilation flexible ducts.

Utility model content

The utility model proposes a wireless network-based real-time monitoring system for the state of the flexible air duct for tunnel construction ventilation, which is used for online monitoring of the state of the flexible air duct for tunnel construction ventilation, and can monitor the air leakage of the air duct in real time.

The technical scheme adopted in the utility model:

A tunnel construction ventilation flexible air duct status monitoring system, which is composed of detection nodes, WIFI network and server; the monitoring node completes the collection and upload of information; the server completes the storage and release of data; Wind speed monitoring points are set between the five flexible air ducts, and a detection node is installed correspondingly. The detection node has a two-layer structure, and the outer layer of the detection node is the same vinylon tape as the flexible air duct. Connect with the flexible air duct; the inner layer of the detection node is made of hard plastic, install the wind speed sensor probe or/and wind pressure detection hose; there is a sealing hook on the upper right or upper left of the detection node to facilitate the installation of the detection node; The output signal of the wind speed sensor probe in the detection node is connected to the main circuit of the sensor suspended and fixed outside the detection node, and the wind pressure detection hose is connected to the wind pressure sensor in the main circuit of the sensor.

The sensor main circuit includes a main control chip STC90C58AD, a wind speed detection circuit, a wind pressure detection circuit, a WIFI module, a multi-channel analog switch chip CD4052 and a power supply circuit. The main control chip controls the WIFI module through the serial port to realize the access of the WIFI network The wind speed detection circuit is connected to the wind speed sensor probe through the interface; the wind pressure detection circuit is connected to the wind pressure hose through the interface; the wind speed and wind pressure detection circuit is powered by 24V; the WIFI module is powered by 3.3V; the multi-channel analog switch chip CD4052 is powered by ±5V .

In the tunnel construction ventilation flexible air duct status monitoring system, three groups of harmful substance sensor probes are installed at three different heights on the detection node to measure the concentration of harmful substances at different heights respectively; the three groups of harmful substance sensor probes are connected through a conditioning circuit The main circuit of the sensor, the main control chip and the conditioning circuit of the hazardous substance sensor are powered by 5V.

The beneficial effects of the utility model:

1. The utility model real-time monitoring system for ventilation flexible air duct status of tunnel construction is composed of detection nodes, WIFI network and server. The monitoring node completes the collection and upload of information; the server completes the storage and release of data; the WIFI network connects the nodes and the server. The on-site personnel of the monitoring system can log in to the webpage published by the server through a mobile terminal that meets the environmental requirements, and query the real-time data of each node.

2. The utility model tunnel construction ventilation flexible air duct status monitoring system has a simple structure, a reasonable design, and is safe and reliable to use. It can monitor the air leakage of the air duct in real time, quickly find the air leakage point, and give a reminder according to the change of the monitoring point value, reminding the ventilator to maintain the air duct in time, so as to effectively improve the ventilation effect and efficiency of the tunnel construction ventilation system.

3. The status monitoring system of the tunnel construction ventilation flexible air duct of the utility model relies on the detection and judgment of the computer system to monitor the air leakage of the air duct in real time, and realizes the online monitoring of the status of the tunnel construction ventilation flexible air duct. At the same time, by integrating some common harmful gas detection sensors in the tunnel construction process, the system realizes the detection function of the common harmful gas concentration in the construction tunnel, and can effectively monitor the construction environment of the entire tunnel.

Description of drawings

Figure 1 is a schematic diagram of the composition of the tunnel construction ventilation system;

Fig. 2 is a composition principle diagram of the flexible air duct monitoring system of the present invention;

Fig. 3 is a schematic diagram of the detection node circuit of the flexible air duct monitoring system of the present invention.

Detailed ways

The technical solutions of the present invention will be further described in detail through specific implementation methods below.

Example 1

Referring to Fig. 2, the utility model tunnel construction ventilation flexible air duct state monitoring system is made up of detection node, WIFI network and server; monitoring node completes information collection and uploading; server completes data storage and release; WIFI network connects node and server , set wind speed monitoring points between every 3 to 5 flexible air ducts, and install a detection node correspondingly. The detection node has a two-layer structure, and the outer layer of the detection node is the same vinylon tape as the flexible air duct. There is a zipper to facilitate the connection with the flexible air duct; the inner layer of the detection node is made of hard plastic, and the wind speed sensor probe or/and wind pressure detection hose are installed; there is a sealing hook on the upper right or upper left of the detection node for convenience. The installation of the detection node; the output signal of the wind speed sensor probe in the detection node is connected to the main circuit of the sensor suspended and fixed outside the detection node, and the wind pressure detection hose is connected to the wind pressure sensor in the main circuit of the sensor.

Example 2

Referring to Figure 2 and Figure 3, the tunnel construction ventilation flexible air duct status monitoring system of this embodiment differs from Embodiment 1 in that the sensor main circuit includes a main control chip STC90C58AD, a wind speed detection circuit, and a wind pressure detection circuit , WIFI module, multi-channel analog switch chip CD4052 and power circuit, the main control chip controls the WIFI module through the serial port to realize the access of the WIFI network; the wind speed detection circuit is connected to the wind speed sensor probe through the interface; the wind pressure detection circuit is connected to the wind speed through the interface The wind speed and wind pressure detection circuit is powered by 24V; the WIFI module is powered by 3.3V; the multi-channel analog switch chip CD4052 is powered by ±5V. The main control chip is powered by 5V. The power circuit transforms the 220V AC into a suitable voltage and distributes it to the corresponding circuit through the aviation plug.

The main control chip STC90C58AD is a 51 single-chip microcomputer with 8-channel 10-bit AD conversion. Among them, two AD channels are reserved for wind speed and wind pressure, leaving only 6 AD channels. In order to collect 18 analog signals, an analog switch circuit is designed based on CD4052 in the circuit. The chip CD4052 is a four-choice multi-way switch, according to the logical combination of pins A and B (given by P0.0 and P0.1 of the main control chip) to select one of the signals in X ₀ -X ₃ to output to X pin, and select one of Y0-Y ₃ signals to output to the Y pin. Three pieces of CD4052 constitute a total of 6 analog switch channels that can be selected from four, and the specific pin connections are shown in Table 1. In Table 1, the X ₀ -X ₃ pins of the first CD4052 respectively input the CO concentration sensing values of the three groups of conditioning circuits, and the Y0-Y ₃ pins respectively input the CO ₂ concentration sensing values of the three groups of conditioning circuits; The X ₀ -X ₃ pins of the two CD4052 input the dust concentration sensing values of the three groups of conditioning circuits respectively, and the Y0-Y ₃ pins respectively input the methane concentration sensing values of the three groups of conditioning circuits; the X ₀ of the third CD4052 The -X ₃ pins respectively input the NO ₂ concentration sensing values of the three groups of conditioning circuits, and the Y0-Y ₃ pins respectively input the H ₂ S concentration sensing values of the three groups of conditioning circuits. The main control chip outputs selection signals from P0.0 and P0.1, and collects different analog signals in time division.

Table 1. Detection Node Sensor Circuit Pin Connections

Example 3

Referring to Figure 2 and Figure 3, the tunnel construction ventilation flexible air duct status monitoring system of this embodiment differs from Embodiment 1 or Embodiment 2 in that three groups of harmful substances are installed at three different heights on the detection nodes (CO, CO ₂ , dust, methane, NO ₂ , H ₂ S) sensor probes measure the concentration of harmful substances at different heights respectively; the detection function of the concentration of common harmful gases in construction tunnels is realized. The three groups of harmful substance sensor probes are connected to the sensor main circuit through the conditioning circuit and the interface circuit, and the main control chip and the harmful substance sensor conditioning circuit are powered by 5V.

Three groups of hazardous substance sensor conditioning circuits input 5V voltage respectively and return voltage signals representing the concentration of the measured substance. Six kinds of harmful substances are measured in each group of conditioning circuits, namely CO, CO ₂ , dust, methane, NO ₂ , and H ₂ S. A total of 18 analog signals need to be collected in the three groups of conditioning circuits.

The utility model is based on a wifi network-based monitoring system for the state of flexible air ducts in tunnel construction ventilation, which realizes the real-time discovery and reminder of the air leakage points of the flexible air ducts. On-site personnel can log in to the webpage published by the server through a mobile terminal that meets the environmental requirements, and query the real-time data of each node.

The flexible air duct is made of soft material. When the fan is turned on, the air duct expands; when the fan stops, the air duct sags. Generally, one detection node is installed for every five flexible ducts (100 meters). In Figure 2, L1 is 100 meters; L2 is designed to be 0.1 meters. Thereby minimizing the weight of detection nodes. In Figure 2, detection nodes 1 and 2 correspond to the right suspension and left suspension respectively. The right side is used for hanging, and the hanging hook is located at 60 degrees in the vertical direction on the upper right.

On the detection node, install the main circuit of the sensor on the outside of the suspension, fix it on the outside of the detection node through the wind speed sensor probe and the wind pressure sensor hose, and wrap it with vinylon tape, leaving only one observation hole at the position of the indicator light. Wherein the wind speed sensor probe points to the center of the hard plastic inner layer and is installed at an angle of 60 degrees to the vertical direction, directly opposite to the hook of the closed opening. The length L4 of the wind speed probe needs to be greater than two-thirds of the diameter of the air duct.

The power supply of the whole detection node is provided by the on-site power line. The position of the power wiring is horizontally symmetrical with the sensor circuit board. The power wiring adopts aviation plugs, which is convenient for field installation.

The utility model relates to a tunnel construction ventilation flexible air duct state monitoring system. The server program includes three components: a data collection program, a data release program and a database. The data collection program collects the data of each detection node through the network interface; the data release program releases data information to the network based on the B/S structure; the database is used to store all collected data.

The data collection program is a program running in the background. The Ethernet data collection program is written in VB.net language and stored in the database. After the program starts running, the program icon will appear on the system status bar. Right-click the icon to pop up a shortcut menu to complete operations such as starting, stopping, and exiting the program for data collection.

The data publishing program is an information publishing website developed based on the PHP language. It is developed using the PHP programming language. Users can query the data through any network terminal. Clients (mobile phones, computers, etc.) connected to the WIFI network can view the data uploaded by each detection node by visiting the webpage.

The database is developed based on the open source MySql, which can improve the flexibility of the system. MySql database is an open source technology, easy to use and easy to maintain.

Wind speed detection components/detection nodes are installed at the wind speed monitoring points to detect the wind speed at the installation position of the wind speed detection components/wind speed monitoring point in real time, and the air volume value passing through the detection point is obtained through integral calculation; according to the air volume value at the fan outlet and the 100m The air leakage rate can be calculated to obtain the air volume value of each wind speed monitoring point under normal conditions; compare the air volume value of each monitoring point of the flexible air duct detected in real time with the air volume value of the monitoring point under normal conditions, when a certain monitoring point, For example, when the air volume value at point a has a large deviation compared with the air volume value under normal conditions, and the air volume value at the upstream detection point b point does not have a large deviation compared with the theoretical value, then judge the difference between point a and point b. There is an air leak in the air duct.

The wind speed detection components installed at each wind speed monitoring point are provided with corresponding numbers and position marks. When the wind speed detection component detects the abnormal signal of air volume at the monitoring point, it will release the abnormal information of the corresponding monitoring point through wireless communication. The server and portable terminals (mobile phones, computers, etc.) obtain the corresponding information of abnormal monitoring points.

Claims (5)

1. A kind of 1. construction ventilation of tunnel flexible duct real-time detection system for state, by detection node, WIFI network and server group Into；Monitoring node completes the collection and upload of information；Server completes the storage and issue of data；WIFI network connecting node and Server, it is characterised in that：Air monitoring point is set between every 3~5 flexible ducts, it is corresponding that a detection node is installed, The detection node is double-layer structure, and with detection node outer layer is the vinylon adhesive plaster flexible duct as, both ends equipped with it is soft Property air hose connection slide fastener；Detection node internal layer is rigid plastics, installation air velocity transducer probe or/and wind pressure detection hose； The seal type hook for facilitating detection node to install is equipped with the upper right side of detection node or upper left side；Wind speed in detection node passes The sensor main circuit that the outer side mounting of sensor probe output connecting detection node is fixed, wind pressure detection hose connection sensor Wind pressure sensor in main circuit.
2. 2. construction ventilation of tunnel flexible duct real-time detection system for state according to claim 1, it is characterised in that：It is described Detection node, air velocity transducer probe are directed toward the center of circle installation of rigid plastics internal layer, its angle is 60 degree with vertical direction, with envelope Remain silent and link up with right opposite；The length L4 of air velocity transducer probe is more than 2/3rds of dust diameter.
3. 3. construction ventilation of tunnel flexible duct real-time detection system for state according to claim 1 or 2, it is characterised in that： The sensor main circuit includes main control chip STC90C58AD, wind speed measurement circuit, wind pressure detection circuit, WIFI module, more Path analoging switch chip CD4052 and power circuit, main control chip realize WIFI network by Serial Port Control WIFI module Access；Wind speed measurement circuit connects air velocity transducer by interface and pops one's head in；Wind pressure detection circuit is soft by interface connection wind pressure Pipe；Wind speed, wind pressure detection circuit are powered using 24V；WIFI module is powered using 3.3V；Multiway analog switch chip CD4052 is adopted Powered with ± 5V, main control chip is powered using 5V.
4. 4. construction ventilation of tunnel flexible duct real-time detection system for state according to claim 3, it is characterised in that：Examining Three different height on node are surveyed, three groups of harmful substance sensor probes are installed, measure the harmful substance of different height respectively Concentration；Three groups of harmful substance sensor probes connect sensor main circuit, harmful substance sensor conditioning electricity by modulate circuit Road is powered using 5V.
5. 5. construction ventilation of tunnel flexible duct real-time detection system for state according to claim 1 or 2, it is characterised in that： Three different height in detection node, install three groups of harmful substance sensor probes, measure the harmful of different height respectively Material concentration；Three groups of harmful substance sensor probes connect sensor main circuit by modulate circuit.