CN114294063B - Device and method for rapidly detecting harmful gas in tunnel surrounding rock in segmented manner - Google Patents
Device and method for rapidly detecting harmful gas in tunnel surrounding rock in segmented manner Download PDFInfo
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- CN114294063B CN114294063B CN202111659362.8A CN202111659362A CN114294063B CN 114294063 B CN114294063 B CN 114294063B CN 202111659362 A CN202111659362 A CN 202111659362A CN 114294063 B CN114294063 B CN 114294063B
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Abstract
The invention provides a device and a method for rapidly detecting harmful gas in tunnel surrounding rock in a segmented manner. The roadway is plugged by the flexible plugging component, the system is suitable for the content of harmful gas in drill holes with different shapes and sizes, the partitioned and segmented real-time detection of the harmful gas is realized according to actual requirements in the detection process, the segmented detection of the distribution of a harmful gas migration channel, the types and concentrations of the harmful gas in different sections in front of a working face, the concentrated overflow and dispersion sections of the harmful gas and the source of the harmful gas in the tunneling process are facilitated, and therefore reference is provided for making effective plugging prevention and purification measures.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a device and a method for rapidly detecting harmful gas in tunnel surrounding rock in a segmented manner.
Background
With the development of national economy, the strategic policy of traffic advance is to step on the ground, and the construction projects of deep-buried tunnels passing through harmful gas areas are gradually increased, so that the investigation, the control and the purification of the harmful gas tunnels are very important. Because the geology of the Chuanzang railway area is extremely complex and special, the buried depth of the built tunnel is large, and a plurality of tunnels have H 2 S、SO 2 、CH 4 、NO 2 、CO、CO 2 And the coexistence and standard exceeding of harmful gas of multiple sources. Particularly, when the tunnel needs to pass through a complex geological structure, the development of surrounding rock structure cracks is intensified due to engineering disturbance, and the risk of harmful gas overflow is increased. If the migration channel, the type and the concentration of harmful gas in front of the working face cannot be detected in real time and accurately in advance, the method is formulatedThe effective plugging measures can cause harmful gas to seep out, and threaten the life safety of construction personnel.
The utility model provides a gaseous detection device of downthehole visuality that CN212027767U provided, including the telescopic link, the inside of telescopic link is equipped with the rubber tube, the one end intercommunication of rubber tube has gaseous detector, bluetooth camera is installed to the one end of telescopic link, the one end of telescopic link is located the equal fixedly connected with fixed block in bluetooth camera's both sides, two the equal threaded connection in one side of fixed block has a threaded rod, two the one end that the threaded rod is adjacent all rotates and is connected with the bearing, and at the in-process that uses, utilizes the camera video recording function, installs camera and gaseous detector on the telescopic link, fine solution gaseous detection and the surrounding rock condition in the advance drilling and distinguish. According to the prior art, through extracting gas in the hole, the types of the gas in the range of the front section (drilling depth) of the working surface and the average gas concentration after mixing are comprehensively detected and analyzed, the types and the concentrations of harmful gas overflowing from different sections and positions in front cannot be accurately detected, the concentrated overflowing area of the harmful gas cannot be separated out, and the reference significance for formulating an economical and effective plugging and purifying scheme for the tunnel is small. In addition, the prior art can only ascertain the overflow type and average concentration of harmful gas in the whole drilling hole, and although whether the harmful gas exceeds the standard can be determined, the accurate section where the gas overflows still exists after the plugging can not be accurately positioned, and the design of a secondary reinforcing plugging scheme can not be provided with a basis.
Disclosure of Invention
The invention aims to provide a device and a method for rapidly detecting harmful gas in tunnel surrounding rocks in a segmented manner, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a quick segmentation detection device of tunnel country rock harmful gas, includes telescopic rod subassembly and detection mechanism, detection mechanism sets up the tip at telescopic rod subassembly, wherein:
the detection mechanism comprises a supporting rod, a gas detection assembly and a flexible plugging assembly, wherein the gas detection assembly is arranged on the supporting rod, the two sides of the gas detection assembly are respectively provided with the flexible plugging assembly for plugging the roadway, and a gas sensor is arranged in the gas detection assembly.
Preferably, flexible shutoff subassembly is including expanding mechanism, the sealed cloth of elasticity, shutoff gasbag, trachea and air pump that contracts, expand mechanism setting on the bracing piece that contracts, the sealed cloth of elasticity sets up on expanding mechanism that contracts, and then is umbelliform flexible in order to adapt to different apertures by expanding mechanism drive the sealed cloth of elasticity according to the aperture in tunnel, the shutoff gasbag is connected with the sealed cloth of elasticity, and two shutoff gasbags in two flexible shutoff subassemblies pass through the trachea intercommunication, and one of them shutoff gasbag and air pump intercommunication.
Preferably, expand the mechanism that contracts and include slide rail, carriage, link, expand arm and the linking arm that contracts, the slide rail is solid to be overlapped on the bracing piece, the carriage cooperation is installed on the slide rail, and the link is solid to be overlapped on the bracing piece, it articulates on the link to expand the arm that contracts, the one end and the carriage of linking arm are articulated, and the other end is articulated with the arm that contracts of expanding.
Preferably, the expansion and contraction mechanism further comprises a threaded sleeve and a screw rod, the screw rod is rotatably mounted on the connecting frame, the threaded sleeve is arranged on the sliding frame, and the screw rod penetrates through the threaded sleeve and forms threaded connection with the threaded sleeve.
Preferably, the inner wall of the elastic sealing cloth is attached to the expansion and contraction arm.
Preferably, the telescopic rod component consists of extension rods which are butted with each other, and two adjacent extension rods are connected through a thread pair.
Preferably, the support rod is butted with the extension rod.
Preferably, the gas sensor is arranged on the support rod through a rotary frame, and the rotary frame is sleeved with an annular filter screen.
A method for rapidly detecting harmful gas in tunnel surrounding rock by sections comprises the following steps:
s1, drilling a hole slightly larger than the detection device on the tunnel face or the position where the harmful gas blocking effect is to be detected by using an exploration drilling machine;
s2, the extension bars are mutually butted to form a telescopic bar assembly, then the screw rod is rotated to enable the sliding frame to translate along the sliding rail, the connecting arm translates along with the sliding rail, the connecting arm drives the expansion and contraction arm to turn over, and the expansion and contraction arm drives the elastic sealing cloth to expand or contract to adapt to the size of the current hole;
s3, connecting the support rods with the extension rods butted with each other in the S2;
s4, inserting the detecting mechanism into the hole;
s5, when the detection mechanism reaches the region to be detected of harmful gas, the extension bar is stopped to be pushed, at the moment, the air pump inflates the blocking air bags communicated with the air pump, and then the two blocking air bags are inflated simultaneously under the action of the air pipe to be contacted with the inner wall of the surrounding rock in the hole, so that the effect of sealing the region to be detected is achieved;
s6, after the gas sensor transmits the measured data back, the gas pump pumps out the gas in the plugging air bag, then the detection mechanism stretches into or pumps back to the next position to be measured, and then the plugging air bag is inflated to plug the surrounding rock, so that segmented detection is realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention plugs the roadway through the flexible plugging component, is suitable for the content of harmful gas in drill holes with different shapes and sizes, realizes the partitioned and segmented visual real-time detection of the harmful gas according to the actual requirements in the detection process, and is beneficial to segmentally finding out the distribution of a harmful gas migration channel, the types and the concentrations of the harmful gas in different sections in front of a working face, the concentrated overflowing section of the harmful gas and the source of the harmful gas in the tunneling process, thereby providing reference for formulating effective plugging prevention and purification measures.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a three-dimensional schematic view of a detection mechanism of the present invention;
FIG. 3 is a three-dimensional schematic view of a gas detection assembly according to the present invention;
FIG. 4 is a three-dimensional schematic view of the expanding and contracting mechanism of the present invention;
fig. 5 is a schematic diagram of the operation of the invention in detecting a roadway.
In the figure: the device comprises a telescopic rod assembly 1, a detection mechanism 2, an extension rod 11, a support rod 21, an air detection assembly 22, an expansion and contraction mechanism 23, elastic sealing cloth 24, a sealing air bag 25, an air pipe 26, an air pump 27, an air sensor 221, a rotary frame 222, a ring-shaped filter screen 223, a sliding rail 231, a sliding frame 232, a connecting frame 233, an expansion and contraction arm 234, a connecting arm 235, a threaded sleeve 236, a screw 237, surrounding rock 100 and a roadway 101.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1 to 4, the present invention provides a technical solution:
the utility model provides a quick segmentation detection device of tunnel country rock harmful gas, includes telescopic rod subassembly 1 and detection mechanism 2, wherein:
the detection mechanism 2 is arranged at the end part of the telescopic rod assembly 1, the telescopic rod assembly 1 consists of extension rods 11 which are mutually butted, two adjacent extension rods 11 are connected through a thread pair, and the number of the extension rods 11 is reasonably selected according to the depth of a region to be detected, so that the detection mechanism 2 can extend to the position to be detected;
the detection mechanism 2 comprises a support rod 21, a gas detection assembly 22 and a flexible plugging assembly, the support rod 21 is butted with the extension rod 11, the connection mode adopts a threaded connection mode or other detachable connection modes, the gas detection assembly 22 is arranged on the support rod 21, two sides of the gas detection assembly 22 are respectively provided with a flexible plugging assembly for plugging a roadway, the flexible plugging assembly comprises an expansion and contraction mechanism 23, an elastic sealing cloth 24, plugging air bags 25, an air pipe 26 and an air pump 27, the expansion and contraction mechanism 23 is arranged on the support rod 21, the elastic sealing cloth 24 is arranged on the expansion and contraction mechanism 23, the expansion and contraction mechanism 23 drives the elastic sealing cloth 24 to expand and contract in an umbrella shape according to the aperture of the roadway to adapt to different apertures, the plugging air bags 25 are connected with the elastic sealing cloth 24, the plugging air bags 25 deform along with the expansion and contraction when the elastic sealing cloth 24 expands and contracts, and the two plugging air bags 25 in the two flexible plugging assemblies are communicated through the air pipe 26, further ensuring the air charging and discharging synchronization, wherein one plugging air bag 25 is communicated with the air pump 27, the gas sensor 221 in the gas detection assembly 22 is installed on the support rod 21 through the rotary frame 222, and the rotary frame 222 is sleeved with the annular filter screen 223.
As a preferred embodiment, the expansion and contraction mechanism 23 includes a slide rail 231, a sliding frame 232, a connecting frame 233, an expansion and contraction arm 234, a connecting arm 235, a threaded sleeve 236 and a screw 237, the slide rail 231 is fixedly sleeved on the support rod 21, the sliding frame 232 is cooperatively installed on the slide rail 231 and forms a moving pair on a central axis of the slide rail 231, the connecting frame 233 is fixedly sleeved on the support rod 21, the expansion and contraction arm 234 is hinged on the connecting frame 233, one end of the connecting arm 235 is hinged with the sliding frame 232, the other end is hinged with the expansion and contraction arm 234, the screw 237 is rotatably installed on the connecting frame 233, the threaded sleeve 236 is disposed on the sliding frame 232, wherein the screw 237 penetrates through the threaded sleeve 236 and forms a threaded connection with the threaded sleeve 236, and an inner wall of the elastic sealing cloth 24 is attached to the expansion and contraction arm 234.
In a preferred embodiment, the sliding frame 232 and the connecting frame 233 are both of a rotary type, and the expanding and contracting arms 234 are arranged in an array, thereby ensuring a supporting effect on the elastic sealing cloth 24.
As a preferred embodiment, gas sensor 221 is used to detect H 2 S、SO 2 、CH 4 、NO 2 、CO、CO 2 For example, the concentration of the gas, or measure a harmful gas alone, that is, the turret 222 is provided with a single or a plurality of gas sensors 221.
A method for rapidly detecting harmful gas in tunnel surrounding rock by sections comprises the following steps:
s1, drilling a hole slightly larger than the detection device on the tunnel face or the position where the harmful gas blocking effect is to be detected by using an exploration drilling machine;
s2, the extension bars 11 are butted to each other to form an extension bar assembly 1, and then the screw 237 is rotated to make the sliding rack 232 translate along the sliding rail 231, at this time, the connecting arm 235 translates along with it, then the connecting arm 235 drives the expansion arm 234 to turn over, and the expansion arm 234 drives the elastic sealing cloth 24 to expand or contract to adapt to the current hole size;
s3, connecting the support bar 21 with the extension bar 11 butted with each other in the S2;
s4, inserting the detecting mechanism 2 into the hole, taking fig. 5 as an example, namely inserting the detecting mechanism 2 into the roadway 101 in the surrounding rock 100;
s5, when the detection mechanism 2 reaches the region to be detected of harmful gas, the extension bar 11 stops being pushed, at the moment, the air pump 27 inflates the blocking air bags 25 communicated with the air pump, and then the two blocking air bags 25 are inflated simultaneously under the action of the air pipe 26 to be contacted with the inner wall of the surrounding rock in the hole, so that the effect of sealing the region to be detected is achieved;
s6, after the gas sensor 221 returns the measured data, the air pump 27 pumps out the gas in the plugging air bag 25, and then the detection mechanism 2 is extended into or pumped back to the next position to be measured, and then the plugging air bag 25 is inflated to plug the surrounding rock, so that the segmented detection is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a quick segmentation detection device of tunnel country rock harmful gas, includes telescopic rod subassembly (1) and detection mechanism (2), detection mechanism (2) set up the tip at telescopic rod subassembly (1), its characterized in that:
the detection mechanism (2) comprises a support rod (21), a gas detection assembly (22) and a flexible plugging assembly, wherein the gas detection assembly (22) is arranged on the support rod (21), two sides of the gas detection assembly (22) are respectively provided with the flexible plugging assembly for plugging a roadway, and a gas sensor (221) is arranged in the gas detection assembly (22);
the flexible plugging components comprise an expansion and contraction mechanism (23), elastic sealing cloth (24), plugging air bags (25), an air pipe (26) and an air pump (27), the expansion and contraction mechanism (23) is arranged on the supporting rod (21), the elastic sealing cloth (24) is arranged on the expansion and contraction mechanism (23), the elastic sealing cloth (24) is driven by the expansion and contraction mechanism (23) to expand and contract in an umbrella shape according to the aperture of a roadway so as to adapt to different apertures, the plugging air bags (25) are connected with the elastic sealing cloth (24), the two plugging air bags (25) in the two flexible plugging components are communicated through the air pipe (26), and one plugging air bag (25) is communicated with the air pump (27);
expand mechanism (23) that contracts and include slide rail (231), carriage (232), link (233), expand arm (234) and linking arm (235) that contract, slide rail (231) are overlapped on bracing piece (21) admittedly, carriage (232) cooperation is installed on slide rail (231), and link (233) are overlapped on bracing piece (21) admittedly, expand arm (234) that contracts and articulate on link (233), the one end and carriage (232) of linking arm (235) are articulated, and the other end is articulated with arm (234) that contracts that expands.
2. The device for rapidly detecting harmful gases in tunnel surrounding rocks according to claim 1, is characterized in that: the expansion and contraction mechanism (23) further comprises a threaded sleeve (236) and a screw rod (237), the screw rod (237) is rotatably installed on the connecting frame (233), the threaded sleeve (236) is arranged on the sliding frame (232), and the screw rod (237) penetrates through the threaded sleeve (236) and is in threaded connection with the threaded sleeve (236).
3. The device for rapidly detecting harmful gases in tunnel surrounding rocks according to claim 1, is characterized in that: the inner wall of the elastic sealing cloth (24) is attached to the expansion and contraction arm (234).
4. The device for rapidly detecting harmful gases in tunnel surrounding rocks according to claim 1, is characterized in that: the telescopic rod component (1) is composed of extension rods (11) which are mutually butted, and two adjacent extension rods (11) are connected through a thread pair.
5. The device for rapidly segmenting and detecting harmful gases in tunnel surrounding rocks according to claim 4, is characterized in that: the support rod (21) is in butt joint with the extension rod (11).
6. The device of claim 1 for rapidly detecting harmful gases in tunnel surrounding rocks in a segmented manner, which is characterized in that: the gas sensor (221) is arranged on the support rod (21) through a rotary frame (222), and an annular filter screen (223) is sleeved on the rotary frame (222).
7. The detection method of the device for rapidly detecting harmful gases in tunnel surrounding rocks according to claim 1 is characterized by comprising the following steps:
s1, drilling a hole slightly larger than the detection device on the tunnel face or the position where the harmful gas blocking effect is to be detected by using an exploration drilling machine;
s2, the extension bars (11) are mutually butted to form an extension bar assembly (1), then the screw (237) is rotated to enable the sliding frame (232) to translate along the sliding rail (231), at the moment, the connecting arm (235) translates along with the sliding rail, the connecting arm (235) drives the expansion arm (234) to turn over, and the expansion arm (234) drives the elastic sealing cloth (24) to expand or contract to adapt to the size of the current hole;
s3, connecting the support rod (21) with the extension rod (11) butted with each other in the S2;
s4, the detection mechanism (2) is deeply inserted into the hole;
s5, when the detection mechanism (2) reaches the region to be detected of harmful gas, the extension bar (11) stops being pushed, at the moment, the air pump (27) inflates the blocking air bags (25) communicated with the air pump, and then the two blocking air bags (25) are inflated simultaneously under the action of the air pipe (26) and are contacted with the inner wall of surrounding rock in the hole, so that the effect of sealing the region to be detected is achieved;
s6, when the gas sensor (221) returns the measured data, the air pump (27) pumps out the gas in the plugging air bag (25), then the detection mechanism (2) is stretched into or pumped back to the next position to be measured, and then the plugging air bag (25) is inflated to plug the surrounding rock, so that the segmented detection is realized.
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| CN117248902B (en) * | 2023-11-17 | 2024-02-06 | 乐山市通达交通勘察设计有限责任公司 | Tunnel harmful gas while-drilling detection advanced detection device |
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| CN203053938U (en) * | 2012-12-09 | 2013-07-10 | 国家电网公司 | Simple telescopic harmful gas detection device |
| CN103742115B (en) * | 2013-12-18 | 2016-03-23 | 中国矿业大学 | A kind of coal mine underground fracturing sealing device and method |
| CN110308252B (en) * | 2019-08-13 | 2022-09-13 | 成都苏杜地质工程咨询有限公司 | Tunnel toxic and harmful gas deep hole testing device and testing method thereof |
| CN210396723U (en) * | 2019-09-11 | 2020-04-24 | 华北科技学院 | Gas pressure measuring device for double-hole pressure measurement |
| CN213743499U (en) * | 2020-11-17 | 2021-07-20 | 河南理工大学 | Three-dimensional detection device for inner wall of mine gas drill hole |
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