A device and method for quickly measuring gas outflow in large-section tunnels

Abstract

The present invention belongs to the field of coal mine safety technology, and particularly relates to a device for quickly measuring the gas outflow in a large-section tunnel, including a plurality of gas outflow measuring devices and a telescopic connection device, wherein the telescopic connection device is used for switching the plurality of gas outflow measuring devices between an unfolded state in a grid-like shape and a folded state in which they are close to each other. The present invention also discloses a method for quickly measuring the gas outflow in a large-section tunnel. The present invention has a low manufacturing cost, and the device is easy to use and carry. The user can quickly become familiar with the operation process of the device and is easy to master. Compared with traditional manual detection and automatic detection methods, the measurement time of gas concentration and wind speed is shortened, and the difficulty and intensity of work during the measurement process are reduced. It can realize simultaneous measurement of multiple measuring points and accurately calculate the absolute gas outflow of the corresponding measuring points, solving the current problems of long manual detection time, delaying construction period, and automatic detection failing to meet measurement accuracy requirements.

Description

[Technical field]

[0002] The invention belongs to the technical field of coal mine safety, and particularly relates to a device and method for quickly determining the gas outburst amount in a large-section tunnel. [Background technology]

[0004] Gas outburst volume refers to the total amount of gas that flows into the mine air from coal seams, etc. per unit time. It includes absolute gas outburst volume and relative gas outburst volume. The absolute gas outburst volume is a basic parameter of coal seam gas. Its rapid and accurate determination is an important basis for gas disaster prevention and control work and is of great significance.

[0005] At present, there are two types of gas prevention and control work: active and passive. Gas monitoring and detection belongs to passive prevention and control work. Its main work content is gas concentration detection and wind speed determination. There are two main methods: manual detection and automatic detection. Manual detection cannot accurately detect the average gas concentration and average wind speed at different locations of large-section tunnels, and the measurement time is long, which delays the construction period and affects the normal operation of the tunnel. Therefore, automatic monitoring is often used on site. The automatic control system used by automatic detection performs real-time monitoring, which can obtain data more accurately. However, in actual measurement work, the gas concentration and wind speed vary greatly, and the values ​​measured at different locations on the section also vary greatly. If a point on the tunnel section is taken

[0006] The gas concentration and average wind speed are used to replace the gas concentration and average wind speed of the entire section, which cannot accurately obtain the gas outflow volume of the tunnel. Therefore, the current automatic detection work still cannot meet the measurement needs. [Summary of the invention]

[0008] In order to solve the problem that in the existing technology of gas monitoring and detection, manual detection cannot accurately detect the average gas concentration and average wind speed at different positions of a large-section tunnel, and the measurement time is relatively long, and automatic detection is unable to meet the measurement requirements due to the large changes in gas concentration and wind speed, and the values ​​measured at different positions of the section also vary greatly. The present invention provides a device and method for quickly determining the gas outburst amount in a large-section tunnel.

[0009] The present invention is achieved through the following technical solutions:

[0010] A device for quickly measuring gas emission in a large-section tunnel comprises a plurality of gas emission measuring devices and a telescopic connection device, wherein the telescopic connection device is used to allow the plurality of gas emission measuring devices to switch between an unfolded state in which they are spread out in a grid-like manner and a folded state in which they are brought close to each other.

[0011] As described above, in a large-section tunnel gas outburst rapid determination device, the telescopic connection device comprises a telescopic link mechanism, a plurality of gas outburst determination devices are arranged on the telescopic link mechanism, and move away from each other as the telescopic link mechanism is extended or move closer to each other as the telescopic link mechanism is contracted.

[0012] In the large-section tunnel gas outflow rapid measuring device as described above, the telescopic connection device comprises an elastic mechanism connected to the gas outflow measuring device, and the elastic mechanism is used to collapse the gas outflow measuring device in an expanded state in a grid-like spread.

[0013] As described above, in a device for quickly determining the gas outflow amount in a large-section tunnel, the telescopic link mechanism includes a fixed rod, a connecting rod arranged on the fixed rod, and a knob arranged on the fixed rod and corresponding to the connecting rod, wherein the knob is used to adjust the telescopic height of the corresponding connecting rod relative to the fixed rod, so as to adjust the vertical height of the gas outflow amount determining device on the telescopic link mechanism.

[0014] In the device for quickly determining the gas outburst amount in a large-section tunnel as described above, the telescopic link mechanism also includes a connecting piece arranged at the top of the telescopic link mechanism, a fixing piece arranged at the bottom of the telescopic link mechanism, and a roller arranged above the fixing piece, wherein the connecting piece is used to connect the telescopic link mechanism and the tunnel wall, when the telescopic link mechanism is in an upright state, the fixing piece is used to fix the telescopic link mechanism and the ground, and when the telescopic link mechanism is in an inclined state, the roller contacts the ground to drive the telescopic link mechanism to move.

[0015] As described above, a device for quickly measuring the gas outflow amount in a large-section tunnel comprises a gas monitoring sensor and a wind speed sensor.

[0016] In the above-mentioned large-section tunnel gas outburst rapid determination device, the elastic mechanism is a high-elasticity rubber rope with built-in steel wire.

[0017] The present invention also provides a method for quickly measuring the gas outflow volume in a large-section tunnel, the method being applied to any of the above-mentioned quick measuring devices, the method comprising the following steps:

[0018] Step 1: Select the section to be measured in the tunnel;

[0019] Step 2: Move the measuring device to the center line of the section to be measured;

[0020] Step 3: Expand the measuring device and place the gas outflow measuring device along the section to be measured.

[0021] It is spread out in a grid-like manner to each measuring point;

[0022] Step 4: Simultaneously turn on the gas outflow measurement device at each measuring point to conduct measurement. After the measurement is completed, save and record the gas concentration ω and average wind speed v data of each measuring point, and turn off the gas outflow measurement device uniformly;

[0023] Step 5: Measure the area A of the tunnel cross section and calculate the absolute gas outflow at each measuring point in the tunnel.

[0024] The above-mentioned method for rapid determination of gas emission in large-section tunnels is used to calculate the

[0025] The method uses the gas concentration and average wind speed of the entire section to be measured to calculate the gas concentration at each measuring point in the tunnel.

[0026] The absolute gas emission formula is: ,in is the absolute gas outflow ( / min), V is the average wind speed in the tunnel (m / s), A is the cross-sectional area of ​​the tunnel to be measured ( ), ω is the average gas concentration at a point on the section to be tested, and α is the gas outburst imbalance coefficient.

[0027] In the method for quickly determining the gas emission volume in a large-section tunnel as described above, the gas emission imbalance coefficient α is 1.5.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The invention discloses a device for quickly determining the gas outburst volume in a large-section tunnel. The device has a low manufacturing cost, and the device is in a grid-like shape as a whole, which is retractable and easy to use and carry. The user can quickly become familiar with the operation flow of the device and it is easy to master. Compared with the traditional manual detection and automatic detection methods, the device shortens the measurement time of gas concentration and wind speed, reduces the difficulty and intensity of work during the measurement process, and can realize simultaneous measurement of multiple measuring points and accurately calculate the absolute gas outburst volume of the corresponding measuring points, thus solving the problems of long manual detection time, delaying the construction period, and the inability of automatic detection to meet the measurement accuracy requirements.

Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a schematic diagram of the overall structure of this application;

[0033] Figure 2 A schematic diagram of the application located at the center line of the tunnel section;

[0034] Figure 3 This is a schematic diagram of the device of the present application after being stretched and arranged in the entire tunnel section. [Specific implementation method]

[0036] In order to make the technical problem, technical solution and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] See also Figures 1 to 3 A device for quickly measuring the gas outflow rate in a large-section tunnel comprises a plurality of gas outflow measuring devices 1 and a telescopic connection device 2, wherein the telescopic connection device 2 is used for allowing the plurality of gas outflow measuring devices 1 to switch between an unfolded state in which they are spread out in a grid-like manner and a folded state in which they are brought close to each other.

[0038] The invention discloses a large-section tunnel gas emission rapid determination device, which has low manufacturing cost, is in the form of a grid as a whole, is retractable, easy to use and carry, and the user can quickly become familiar with the operation process of the device and is easy to master. Compared with the traditional manual detection and automatic detection methods,

[0039] It shortens the measurement time of gas concentration and wind speed, reduces the difficulty and intensity of work during the measurement process, and can achieve simultaneous measurement of multiple measuring points and accurately calculate the absolute gas outburst volume of the corresponding measuring points, solving the current problems of long manual detection time, delaying construction period, and automatic detection being unable to meet measurement accuracy requirements.

[0040] Furthermore, as a preferred embodiment of the present invention but not a limitation, the telescopic connection device 2 includes a telescopic link mechanism 21, and a plurality of the gas outflow amount measuring devices 1 are arranged on the telescopic link mechanism 21, and move away from each other as the telescopic link mechanism 21 is extended or move closer to each other as the telescopic link mechanism 21 is contracted.

[0041] Furthermore, as a preferred embodiment of the present invention but not a limitation, the telescopic connection device 2 includes an elastic mechanism 22 connected to the gas outflow amount measuring device 1, and the elastic mechanism 22 is used to retract the gas outflow amount measuring device 1 in an expanded state in which it is spread out in a grid mesh shape. The end of the telescopic connection device 2 also includes a second connecting member 23, which is used to be fixed on the tunnel wall so that the gas outflow amount measuring device 1 is in an expanded state in which it is spread out in a grid mesh shape.

[0042] Furthermore, as a preferred embodiment of the present invention but not a limitation, the telescopic linkage mechanism 21 includes a fixed rod 211, a connecting rod 212 provided on the fixed rod 211, and a knob 213 provided on the fixed rod 211 and corresponding to the connecting rod 212, wherein the knob 213 is used to adjust the telescopic height of the connecting rod 212 relative to the fixed rod 211, so as to adjust the vertical height of the gas outflow measuring device 1 on the telescopic linkage mechanism 21.

[0043] Furthermore, as a preferred embodiment of the present invention but not a limitation, the telescopic link mechanism 21 also includes a connecting member 214 provided at the top of the telescopic link mechanism 21, a fixing member 215 provided at the bottom of the telescopic link mechanism 21, and a roller 216 provided above the fixing member 215, wherein the connecting member 214 is used to connect the telescopic link mechanism 21 and the tunnel wall, and the fixing member 215 is used to fix the telescopic link mechanism 21 and the ground, and when the telescopic link mechanism 21 is in a tilted state, the roller 216 contacts the ground to drive the telescopic link mechanism 21 to move, so that the device can be moved to the next detection point conveniently and quickly.

[0044] Furthermore, as a preferred implementation of the present solution but not a limitation, the gas outflow amount measuring device 1 includes a gas monitoring sensor 12 and a wind speed sensor 13, and different devices can be quickly assembled according to different measurement requirements.

[0045] Furthermore, as a preferred embodiment of the present invention but not a limitation, the elastic mechanism 22 is a high-elastic rubber rope with built-in steel wire. The rubber rope has built-in high-strength steel wire and is covered with a flexible rubber layer. It has good elasticity and plasticity and can quickly extend and retract the device, making it easy to use and store the device.

[0046] A method for quickly measuring the gas outflow volume in a large-section tunnel, the method is applied to any of the above-mentioned rapid measuring devices, the method comprising the following steps: step 1: selecting a section to be measured in the tunnel;

[0047] Step 2: Move the measuring device to the center line of the section to be measured;

[0048] Step 3: unfold the measuring device and spread the gas outflow measuring device in a grid-like manner along the section to be measured to each measuring point;

[0049] Step 4: Simultaneously turn on the gas outflow measurement device at each measuring point to conduct measurement. After the measurement is completed, save and record the gas concentration ω and average wind speed v data of each measuring point, and turn off the gas outflow measurement device uniformly;

[0050] Step 5: Measure the area A of the tunnel cross section and calculate the absolute gas outflow at each measuring point in the tunnel.

[0051] The invention discloses a method for rapidly measuring the gas emission of a large-section tunnel. The measuring device can be conveniently moved and deployed to form a grid network, and the gas emission of the tunnel can be accurately obtained by calculating according to the data of each measuring point.

[0052] Further, as a preferred implementation of this solution but not a limitation, the calculation method adopts the gas concentration and average wind speed of the entire section to be measured, and the formula for calculating the absolute gas outflow at each measuring point in the tunnel is: ,in is the absolute gas outflow ( / min), V is the average wind speed in the tunnel (m / s), A is the cross-sectional area of ​​the tunnel to be measured ( ), ω is the average gas concentration at a point on the section to be tested, and α is the gas outburst imbalance coefficient

[0053] Furthermore, as a preferred implementation mode of the present invention but not a limitation, the gas outburst imbalance coefficient α=1.5.

[0054] The working principle of this embodiment is as follows:

[0055] The invention discloses a device for quickly determining the gas outburst volume in a large-section tunnel. The device has a low manufacturing cost, and the device is in a grid-like shape as a whole, which is retractable and easy to use and carry. The user can quickly become familiar with the operation flow of the device and it is easy to master. Compared with the traditional manual detection and automatic detection methods, the device shortens the measurement time of gas concentration and wind speed, reduces the difficulty and intensity of work during the measurement process, and can realize simultaneous measurement of multiple measuring points and accurately calculate the absolute gas outburst volume of the corresponding measuring points, thus solving the problems of long manual detection time, delaying the construction period, and the inability of automatic detection to meet the measurement accuracy requirements.

[0056] The above are implementation methods provided in combination with specific contents, and it is not intended that the specific implementation of this application is limited to these descriptions. Any method structure similar to the present application, or a number of technical deductions or replacements based on the concept of the present application, should be considered as the protection scope of this application.

Claims

1. A device for quickly measuring gas outflow in a large-section tunnel, characterized by: The invention comprises a plurality of gas outflow measuring devices (1) and a telescopic connecting device (2), wherein the telescopic connecting device (2) is used to allow the plurality of gas outflow measuring devices (1) to switch between an unfolded state in which they are spread out in a grid-like manner and a folded state in which they are brought close to each other; The telescopic connection device (2) comprises a telescopic connecting rod mechanism (21), and a plurality of the gas outflow amount measuring devices (1) are arranged on the telescopic connecting rod mechanism (21) and move away from each other as the telescopic connecting rod mechanism (21) is extended or move closer to each other as the telescopic connecting rod mechanism (21) is contracted; The end of the telescopic connection device (2) further includes a second connection member (23) for fixing on the tunnel wall so that the gas outflow amount measuring device (1) is in an unfolded state with a grid-like mesh spread out; The telescopic link mechanism (21) further comprises a connecting piece (214) arranged at the top of the telescopic link mechanism (21), wherein the connecting piece (214) is used to connect the telescopic link mechanism (21) and a tunnel wall; The telescopic connection device (2) comprises an elastic mechanism (22) connected to the gas outflow amount measuring device (1), and the elastic mechanism (22) is used to collapse the gas outflow amount measuring device (1) in an expanded state in which it is spread out in a grid-like mesh; The telescopic connecting rod mechanism (21) comprises a fixed rod (211), a connecting rod (212) arranged on the fixed rod (211), and a knob (213) arranged on the fixed rod (211) and corresponding to the connecting rod (212), wherein the knob (213) is used to adjust the telescopic height of the corresponding connecting rod (212) relative to the fixed rod (211), so as to adjust the vertical height of the gas outflow amount measuring device (1) on the telescopic connecting rod mechanism (21); The telescopic link mechanism (21) further comprises a fixing member (215) arranged at the bottom of the telescopic link mechanism (21), and a roller (216) arranged above the fixing member (215); when the telescopic link mechanism (21) is in an upright state, the fixing member (215) is used to fix the telescopic link mechanism (21) and the ground; when the telescopic link mechanism (21) is in an inclined state, the roller (216) contacts the ground to drive the telescopic link mechanism (21) to move.

2. The device for rapidly measuring gas outflow in a large-section tunnel according to claim 1 is characterized in that: The gas outflow amount measuring device (1) comprises a gas monitoring sensor (12) and a wind speed sensor (13).

3. The device for rapidly measuring gas outflow in a large-section tunnel according to claim 1 is characterized in that: The elastic mechanism (22) is a high-elasticity rubber rope with built-in steel wire.

4. A method for quickly measuring the gas emission in a large-section tunnel, characterized in that: The method is applied to the rapid measurement device according to any one of claims 1 to 3, and the method comprises the following steps: step 1: selecting a section to be measured in a tunnel; Step 2: Move the measuring device to the center line of the section to be measured; Step 3: unfold the measuring device and spread the gas outflow measuring device in a grid-like manner along the section to be measured to each measuring point; Step 4: Simultaneously turn on the gas outflow measurement device at each measuring point to conduct measurement. After the measurement is completed, save and record the gas concentration ω and average wind speed v data of each measuring point, and turn off the gas outflow measurement device uniformly; Step 5: Measure the area A of the tunnel cross section and calculate the absolute gas outflow at each measuring point in the tunnel.

5. The method for rapidly measuring the gas emission in a large-section tunnel according to claim 4 is characterized in that: The calculation method uses the gas concentration and average wind speed of the entire section to be measured. The formula for calculating the absolute gas outflow at each measuring point in the tunnel is: ,in is the absolute gas outflow ( / min), V is the average wind speed in the tunnel (m / s), A is the cross-sectional area of ​​the tunnel to be measured ( ), ω is the average gas concentration at a point on the section to be tested, and α is the gas outburst imbalance coefficient.

6. The method for rapidly measuring the gas emission in a large-section tunnel according to claim 5, characterized in that: The gas outburst imbalance coefficient α=1.5.

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