CN212406807U - Cold region tunnel temperature field remote automatic monitoring system - Google Patents

Abstract

The utility model relates to a long-range automatic monitoring system of cold district tunnel temperature field belongs to tunnel monitoring technology field. The method comprises the following steps: p2 is connected to the battery, and the voltage range of the supported battery is 1.5V-5V; after the P2 passes through the U2 voltage boosting switch chip, stable 5V direct current voltage is output, the output current range is 0-200 mA, and power is supplied to the wireless communication module and a lower-level circuit system; after the 5V direct current voltage passes through a U3 voltage reduction switch chip, stable 3.3V direct current voltage is output, the output current range is 0-300 mA, and the power is supplied to the single chip microcomputer system and the temperature sensor; the filter capacitors C2, C3 and C5 are used for filtering the glitch voltage and the interference voltage; the external temperature sensor is connected to P3, and precision resistors R11-R18 are connected in series in the temperature sensor loop.

Description

Cold region tunnel temperature field remote automatic monitoring system

Technical Field

The utility model belongs to the technical field of the tunnel monitoring, a long-range automatic monitoring system in cold district tunnel temperature field is related to.

Background

The problem of freezing injury is always a stubborn problem during the operation of highway tunnels in cold regions and is not cured all the time, as the design, construction and operation units of tunnels do not master the real data and the incident distribution rule of the tunnel surrounding rock temperature field, the design of tunnel heat preservation is relatively blind and uniform, some scientific research units and high efficiency monitor the distribution rule of the surrounding rock temperature field, most of the units adopt manual monitoring means, the accuracy and the continuity of monitoring data cannot be guaranteed, the monitoring of the temperature field in the operation period of the tunnel is basically interrupted, and the automatic monitoring of the surrounding rock temperature field becomes possible along with the technological progress.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a long-range automatic monitoring system of cold district tunnel temperature field.

In order to achieve the above purpose, the utility model provides a following technical scheme:

cold district tunnel temperature field remote automatic monitoring system includes:

the wire holder P2 is connected to a battery, and the voltage range of the supported battery is 1.5V-5V;

the wire holder P2 outputs stable 5V direct current voltage after the switch chip is boosted by the boost switch chip U2, the output current range is 0-200 mA, and the wireless communication module and a lower-level circuit system are powered;

after the 5V direct current voltage passes through a voltage reduction switch chip U3, a stable 3.3V direct current voltage is output, the output current range is 0-300 mA, and the power is supplied to the single chip microcomputer system and the temperature sensor;

the filter capacitors C2, C3 and C5 are used for filtering the glitch voltage and the interference voltage;

the external temperature sensor is connected to a sensor wire holder P3, and precision resistors R11-R18 are connected in series in a temperature sensor loop;

the voltage of VCC3V3 is divided by a precision resistor and a resistance-type temperature sensor, and then is accessed to an ADC interface of the single chip microcomputer for analog-to-digital conversion, and the single chip microcomputer is connected to the wireless communication module through a UART interface and is in signal connection with a remote server;

transient voltage suppression diodes D4-D10 are used for absorbing high transient voltage input on an interface line of an external temperature sensor so as to protect the single chip microcomputer from long-term stable operation.

The beneficial effects of the utility model reside in that:

additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a plan view of a monitoring section layout;

FIG. 2 is a cross-sectional view of the arrangement of monitoring points;

FIG. 3 is a cross-sectional view of the arrangement of the measuring points;

fig. 4 is a circuit diagram of the temperature acquisition device.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Please refer to fig. 1 to 3, which illustrate a remote automatic monitoring system for tunnel temperature field in cold region.

1) Tunnel site area meteorological data and engineering geological data collection

2) Numerical simulation analysis

Numerical analysis software such as ANSYS or FLAC3D is adopted to carry out numerical simulation analysis on the surrounding rock and lining temperature field, the distribution rule of the surrounding rock and lining structure temperature field in a limit state is obtained, and the following contents are mainly analyzed:

firstly, radially distributing cloud pictures in a tunnel surrounding rock temperature field;

secondly, longitudinally distributing cloud pictures in the tunnel surrounding rock temperature field;

thirdly, a characteristic point temperature change rule graph along with radial depth;

and fourthly, a characteristic point temperature change rule graph along with the longitudinal direction and the like.

3) Extracting key index parameters

Extracting the following key parameters according to the numerical simulation analysis result:

the coldest lunar surrounding rock radial maximum freezing depth H_ZR；

② the maximum length L of the environment negative temperature section (T is less than or equal to-15 ℃) of the entrance of the coldest moon tunnel_Z,T≤-15℃；

③ the maximum length L of the environment temperature negative temperature section (T is more than 15 and less than or equal to-5 ℃) at the entrance of the coldest moon tunnel_{Z,-15＜T≤-5℃,}；

③ the maximum length L of the environment temperature negative temperature section (-5 < T is less than or equal to 0 ℃) at the entrance of the coldest moon tunnel_{Z,-5＜T≤0℃,}；

Fourthly, the maximum length L of the ambient temperature positive temperature section (-T > 0 ℃) at the entrance of the coldest moon tunnel_Z,T＞0℃)。

4) Establishing a monitoring scheme (monitoring section, cross section measuring point arrangement, etc.)

And (3) making a monitoring scheme according to the extracted key index parameters according to the following principles:

firstly, the monitoring sections are distributed according to the distribution rule of the environmental temperature field in the tunnel

The temperature of the environment negative temperature section (T is less than or equal to-15 ℃) at the entrance of the coldest moon tunnel and the section spacing is 20m

The temperature of the environment at the entrance of the coldest-month tunnel is within the negative temperature range (T is more than 15 and less than or equal to 5 ℃) and the section spacing is 50m

In the environment temperature negative temperature section (-5 < T ≤ 0 ℃) of the entrance of the coldest-month tunnel, the section spacing is 100 m;

and in the ambient temperature positive temperature section (-T > 0 ℃) of the entrance of the coldest lunar tunnel, the section spacing is 200 m.

Secondly, arranging cross-section measuring points according to the radial maximum freezing depth

Measuring depth of surrounding rock temperature field to obtain 2H_ZR。

Taking the distance between radial measuring points to be 50 cm;

setting an environment temperature measuring point on the surface of the lining structure (5 points of a left side wall, a right side wall, a left arch waist and a vault);

and environment temperature measuring points are arranged in the left cable trench and the right cable trench.

5) Building deployment system platform

The system platform is formed as follows:

distributed temperature monitoring sensors (thermosensitive components) are buried in the surrounding rock and lining structure.

And the automatic data acquisition and transmission equipment (which is formed by combining a thermistor temperature acquisition module, a wireless communication module and a continuous power supply module) is in wired connection with the monitoring sensor.

And thirdly, the network transfer (transmission) equipment realizes the functions of converting and transmitting the monitoring data from the autonomous network to the 3G/4G network.

And fourthly, the data storage and reading equipment realizes the storage, reading and display of the monitoring data.

The supporting software equipment.

6) In situ test and installation

Burying sensor

The temperature sensor is shown in the figure. When the sensor is buried, the sensor is firstly tied on a long rod (copper core plastic coated wire is adopted in practical use) according to the designed interval; and then the rod body with the sensor string is put into a PVC plastic pipe with the outer diameter not less than 40mm, and the inner end of the PVC pipe is sealed in order to prevent the long-term stable work of the sensor from being influenced by the direct contact of water and the sensor. The sealing method comprises baking the end of the PVC tube with fire, kneading the end with a hand with gloves, cooling, blowing air from the other end, placing the sealed end in water, and testing the sealing effect. And finally, inserting the sensor and the PVC pipe into a pre-drilled drill hole, arranging a lead wire, and plugging the hole opening by using a waste hemp rope.

Secondly, mounting 16-channel data automatic acquisition and transmission equipment on the surface of the tunnel lining, connecting the temperature sensor with the data automatic acquisition and transmission equipment in a wired mode, acquiring data (manually setting acquisition frequency) through the data automatic acquisition and transmission equipment, and transmitting temperature monitoring data to the tunnel portal.

Thirdly, network transfer (transmission) equipment is installed at the tunnel portal, the received data are collected and converted, the data are uploaded to a 3G/4G network, and the data are sent to storage equipment.

And installing (or renting) data storage and reading equipment in the user office, wherein the data storage is convenient for the user to read the data.

7) Monitoring, early warning and visual display are implemented

As shown in fig. 4, the circuit diagram illustrates:

the P2 is connected with a battery, the voltage range of the supported battery is 1.5V-5V, after the battery is boosted by a U2 switch chip, the battery outputs stable 5V direct current voltage, the output current range is 0-200 mA, and the battery supplies power for the wireless communication module and a lower circuit system. After the 5V direct current voltage passes through a U3 voltage reduction switch chip, stable 3.3V direct current voltage is output, the output current range is 0-300 mA, and the power is supplied to the single chip microcomputer system and the temperature sensor; c2, C3 and C5 are all filter capacitors and filter the glitch voltage and the interference voltage.

The external temperature sensor is connected to P3, and R11-R18 are precision resistors and are connected in series in a temperature sensor loop. The voltage of VCC3V3 is divided by a precision resistor and a resistance-type temperature sensor, then the voltage is accessed to an ADC interface of a single chip microcomputer to carry out analog/digital conversion, and the single chip microcomputer reads the temperature data of the sensor, then the temperature data is output to a wireless communication module through a UART interface and finally uploaded to a remote server; in the figure, D4-D10 are transient voltage suppression diodes which are used for absorbing high transient voltage input on an interface line of an external temperature sensor so as to protect the long-term stable operation of the single chip microcomputer.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims (1)

1. Cold district tunnel temperature field remote automatic monitoring system, its characterized in that: the method comprises the following steps:

the wire holder P2 is connected to a battery, and the voltage range of the supported battery is 1.5V-5V;

the wire holder P2 is electrically connected with the boost switch chip U2, the output direct-current voltage of the wire holder P2 is 5V, the output current range is 0-200 mA, and the wire holder P2 is electrically connected with the wireless communication module and the lower-level circuit system;

the voltage boosting switch chip U2 is electrically connected with the voltage reducing switch chip U3, the output direct-current voltage of the voltage reducing switch chip U3 is 3.3V, the output current range is 0-300 mA, and the voltage boosting switch chip U2 is electrically connected with the single chip microcomputer system and the temperature sensor;

filter capacitances C2, C3, and C5;

the external temperature sensor is connected to a sensor wire holder P3, and precision resistors R11-R18 are connected in series in a temperature sensor loop;

the voltage of VCC3V3 is divided by a precision resistor and a resistance-type temperature sensor, and then is accessed to an ADC interface of the single chip microcomputer for analog-to-digital conversion, and the single chip microcomputer is connected to the wireless communication module through a UART interface and is in signal connection with a remote server;

and transient voltage suppression diodes D4-D10 electrically connected with the external temperature sensor interface.

Images