CN210396723U - A gas pressure measuring device for double-hole pressure measuring - Google Patents
A gas pressure measuring device for double-hole pressure measuring Download PDFInfo
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- CN210396723U CN210396723U CN201921513854.4U CN201921513854U CN210396723U CN 210396723 U CN210396723 U CN 210396723U CN 201921513854 U CN201921513854 U CN 201921513854U CN 210396723 U CN210396723 U CN 210396723U
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- 238000009530 blood pressure measurement Methods 0.000 claims description 19
- 230000000903 blocking effect Effects 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 26
- 239000003245 coal Substances 0.000 description 23
- 238000007789 sealing Methods 0.000 description 23
- 239000011435 rock Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013433 optimization analysis Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model relates to a gas pressure measuring device for measuring pressure by double holes, which comprises a pressure sensor, a measuring pipe, a pressure sensor and a pressure sensor, wherein the measuring pipe is fixedly arranged in a measuring hole and is hermetically connected with the hole wall of the measuring hole; the driving motor is fixedly connected to the top of the measuring tube, and a driving shaft of the driving motor is fixedly connected with a screw rod stud extending into the measuring tube; the plugging mechanism is movably connected to the upper end of the screw stud and plugs the measuring pipe when expanding; the moving mechanism is in threaded connection with the screw stud and moves up and down along the screw stud when the screw stud rotates, and the pressure sensor is arranged on the moving mechanism; the gas pressure measuring device can be used in a double-hole pressure measuring mode, can effectively plug a measuring pipe in the measuring process, and can move up and down along the measuring pipe in the measuring process, so that the accuracy of the measured value of the gas pressure is improved.
Description
Technical Field
The utility model belongs to the technical field of the colliery safety determination, a gas pressure survey is used for carrying out soft coal seam gas pressure survey that breaks in the pit in the colliery, especially relates to a gas pressure survey device for diplopore pressure measurement.
Background
In recent ten years, a great deal of research on coal bed gas parameters (such as gas pressure, gas content and gas permeability), especially on the aspect of gas pressure measurement, has been carried out at home and abroad. The gas pressure is a core parameter for prediction and prevention of gas dynamic disasters, and currently, a direct measurement method is mainly adopted in the aspect of gas pressure measurement, and the gas pressure measurement is generally divided into a passive method and an active method according to different hole sealing principles. The passive hole sealing determination method adopts yellow mud, cement mortar, rubber rings, capsules and the like to perform hole sealing determination, and because the method lacks the plugging capability on micro cracks around a drill hole, gas leakage is easy to occur, and the measured gas pressure value is low. The active hole sealing pressure measuring method is proposed by Zhou Shining academy and the like in the 80 s of the 20 th century, the basic principle is to seal liquid by solid and seal gas by liquid, and the pressure of hole sealing liquid is always higher than the gas pressure, so that the method is called as an effective method for accurately measuring the gas pressure of a coal seam.
The various coal bed gas pressure technologies play a powerful technical support for ensuring the safe production of coal mines, but various current testing technologies in production practice have different defects and limitations, for example, the gas pressure is more accurately and reliably measured in a rock roadway under general conditions, but the more accurate and reliable data is often difficult to measure by adopting the same technical scheme in a coal roadway, particularly a soft and broken coal bed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming of the prior art, the utility model aims at providing a simple structure can effectively seal the survey hole at the in-process of survey, improves the survey precision, and uses and adopts echelon slip casting shutoff crack and consolidate the gas pressure survey device for the diplopore pressure measurement of "diplopore pressure measurement" mode of country rock in the soft coal seam gas pressure survey scope that breaks.
In order to achieve the above object, the utility model discloses a following technical scheme, a gas pressure measurement device for diplopore pressure measurement, include:
the measuring tube is fixedly arranged in the measuring hole and is connected with the hole wall of the measuring hole in a sealing way;
the driving motor is fixedly connected to the top of the measuring tube, and a driving shaft of the driving motor is fixedly connected with a screw rod stud extending into the measuring tube;
the plugging mechanism is movably connected to the upper end of the screw stud and plugs the measuring pipe when expanding;
and the moving mechanism is in threaded connection with the screw stud and moves up and down along the screw stud when the screw stud rotates, and a pressure sensor for detecting gas pressure is arranged on the moving mechanism.
The plugging mechanism comprises an upper supporting circular plate and a lower supporting circular plate which are arranged in parallel, the middle parts of the upper supporting circular plate and the lower supporting circular plate are fixedly connected through a connecting pipe, and two ends of the connecting pipe respectively penetrate through the upper supporting circular plate and the lower supporting circular plate;
a circular airbag is arranged between the upper supporting circular plate and the lower supporting circular plate, and the middle part of the circular airbag is sleeved on the connecting pipe and is fixedly connected with the connecting pipe;
the circular air bag is provided with an air inlet which is communicated with an air inlet pipeline penetrating through the upper supporting circular plate, and the circular air bag expands to be in sealing fit with the inner wall of the measuring pipe when being inflated;
the screw rod stud penetrates through the connecting pipe and is fixedly connected with the connecting pipe through a sealing bearing.
The moving mechanism comprises a mechanism body, the pressure sensor is embedded on one side of the mechanism body, a screw nut in threaded fit with the screw stud is fixedly connected onto the mechanism body, and the upper end of the mechanism body is connected with the lower portion of the plugging mechanism through a telescopic rod.
The top of survey pipe is fixed and is equipped with flange, driving motor and this flange fixed connection.
The circular air bag and the outer wall of the connecting pipe are vulcanized into a whole.
The screw nut penetrates through the middle of the mechanism body, two ends of the screw nut extend out of the upper end face and the lower end face of the mechanism body respectively, and the two telescopic rods are located on two sides of the screw stud respectively.
The utility model has the advantages that: the gas pressure measuring device can be used in a double-hole pressure measuring mode, can effectively plug a measuring pipe in the measuring process, and can move up and down along the measuring pipe in the measuring process, so that the accuracy of the measured value of the gas pressure is improved.
Drawings
FIG. 1 is a schematic view of the structure of the utility model in use;
fig. 2 is a schematic structural view of a middle plugging mechanism of the present invention;
fig. 3 is a schematic structural diagram of the middle moving mechanism of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example 1
As shown in fig. 1, a gas pressure measuring apparatus for double tap pressure measurement includes:
the measuring tube 4 is fixedly arranged in the measuring hole 3 and is connected with the hole wall of the measuring hole 3 in a sealing way; when in use, the measuring tube 4 is inserted into the drilled measuring hole 3 and is blocked;
the driving motor 6 is fixedly connected to the top of the measuring tube 4, and a driving shaft of the driving motor 6 is fixedly connected with a screw rod stud 10 extending into the measuring tube 4; the driving motor 6 is fixedly connected with a connecting flange 5 arranged at the top of the measuring tube 4, so that the driving motor 6 can be stably connected to the measuring tube 4, and the normal work of the driving motor 6 is not influenced;
the plugging mechanism 7 is movably connected to the upper end of the screw stud 10 and plugs the measuring tube 4 when expanding;
an upper supporting circular plate 701 and a lower supporting circular plate 702, which are arranged in parallel with each other, of the plugging mechanism 7 as shown in fig. 2, wherein the diameters of the upper supporting circular plate 701 and the lower supporting circular plate 702 are smaller than the pipe diameter of the measuring tube 4, so that the plugging mechanism 7 can be placed in the measuring tube 4, the middle parts of the upper supporting circular plate 701 and the lower supporting circular plate 702 are fixedly connected through a connecting pipe 704, and two ends of the connecting pipe 704 respectively penetrate through the upper supporting circular plate 701 and the lower supporting circular plate 702; or the centers of the upper supporting circular plate 701 and the lower supporting circular plate 702 are provided with round holes, the connecting pipe is fixedly connected between the upper supporting circular plate 701 and the lower supporting circular plate 702, and the round holes of the upper supporting circular plate 701 and the lower supporting circular plate 702 and the center line of the connecting pipe are positioned on the same straight line; a framework of the plugging mechanism 7 is formed by the connecting pipe, the upper supporting circular plate 701 and the lower supporting circular plate 702;
an annular air bag 703 is arranged between the upper supporting circular plate 701 and the lower supporting circular plate 702, and the middle part of the annular air bag 703 is sleeved on the connecting pipe 704 and is fixedly connected with the connecting pipe 704; the circular airbag is made of rubber materials, the circular part of the circular airbag 703 and the connecting pipe 704 are vulcanized into a whole, the circular airbag expands when in an inflated state, the circular airbag is in sealing fit with the inner wall of the measuring pipe, and the measuring pipe is effectively connected in a sealing way;
the circular air bag 703 is provided with an air inlet which is communicated with an air inlet pipeline 706 penetrating through the upper supporting circular plate 701, and the circular air bag 703 expands to be in sealing joint with the inner wall of the measuring tube 4 when being inflated; specifically, the air inlet pipeline 706 is communicated with an external air pump through an air valve;
the screw stud 10 penetrates through the connecting pipe 704 and is fixedly connected with the connecting pipe 704 through a sealing bearing 705, the sealing bearing 705 can be adopted to ensure that the screw stud can rotate relative to the plugging mechanism, meanwhile, the sealing effect can be achieved, the situation that sealing is unstable when the screw stud 10 is connected in a rotating mode is avoided, specifically, the sealing bearing 705 is respectively connected into the upper end and the lower end of the connecting pipe 704, threads are not arranged at the upper end of the screw stud 10, and the screw stud 10 without thread sections is fixedly connected with the inner rings of the two sealing bearings 705, so that the sealing performance of the screw stud 10 is ensured;
the moving mechanism 9 is connected to the screw stud 10 in a threaded manner, and moves up and down along the screw stud 10 when the screw stud 10 rotates, and a pressure sensor 902 for detecting gas pressure is arranged on the moving mechanism 9.
As shown in fig. 3, the moving mechanism 9 includes a mechanism body 901, the pressure sensor 902 is embedded in one side of the mechanism body 901, a screw nut 903 in threaded fit with the screw stud 10 is fixedly connected to the mechanism body 901, and the upper end of the mechanism body 901 is connected to the lower part of the plugging mechanism 7 through an expansion link 8. The pressure sensor 902 selects the most commonly used shaft bottom gas pressure sensor at present, such as conventional instruments such as a gas pressure measuring meter, the screw nut 903 is in threaded connection with the screw stud, and meanwhile, the mechanism body 901 is fixedly connected with the plugging mechanism through a telescopic rod;
specifically, the screw nut 903 penetrates through the middle of the mechanism body 901, two ends of the screw nut 903 extend out of the upper end face and the lower end face of the mechanism body 901 respectively, and two telescopic rods 8 are located on two sides of the screw stud 10 respectively; the screw nut 903 is arranged in the middle of the mechanism body 901, the left-right shaking is avoided, the telescopic rod stretches synchronously along with the up-down movement of the mechanism body 901, and the telescopic rod mainly plays a role in preventing the mechanism body from rotating along with the screw stud and can stretch along with the mechanism body.
In the using process, the device is installed on the measuring tube, then the plugging device is inflated through the air pump, the plugging device is in sealing fit with the measuring tube, the air pump can be closed at the moment, the air valve can be closed at the same time, the air pump can be continuously opened to ensure the air pressure in the plugging device, the plugging device can be stably fit with the measuring tube, after plugging of the plugging device is completed, the driving motor is started, the driving motor drives the screw stud to rotate forwards or backwards, the moving structure moves up and down on the screw stud, and the pressure sensor 902 on the moving structure is used for detecting the air pressure in the measuring tube.
Specifically, in the whole double-hole pressure measuring process, the following steps are carried out:
preparing before grouting, namely transporting grouting materials (cement and fly ash), drilling equipment, grouting equipment (the grouting equipment used in the embodiment is a 2ZBQ-50/2 synchronous pneumatic grouting pump) and a pipeline to a point needing to be measured, and then installing the equipment;
drilling: after the equipment is installed, selecting the positions of a measuring hole 3 and a grouting hole drilling hole 1, and ensuring that the hole distance between the grouting hole and the measuring hole is 2.5m-3.5m, wherein after the position of the drilling hole is selected with the hole distance of 2.5m, drilling two measuring holes 3 and grouting holes 1 with the diameters of 75-93mm in a coal seam within a pressure measuring range through drilling equipment; in the embodiment, the aperture selection of the measuring hole 1 and the grouting hole 3 is consistent with that of a gas pressure side hole, the value is 75mm, the depth of a drilled hole is selected to be 10m, and multiple sets of drill bits and drill rods are avoided being used in the field actual measurement process;
after the drilling is completed, the floating coal dust is blown clean by compressed air.
C, pipe column descending: respectively inserting a measuring pipe 4 with the length being one half of the depth of the measuring hole and a grouting pipe 2 with the length being three tenths of the depth of the grouting hole into the measuring hole 3 and the grouting hole 1, and sealing the holes of the measuring pipe 4 and the grouting pipe 2; the length of the measuring pipe 3 adopted in the embodiment is 5m, the length of the grouting pipe 2 is 3m, the grouting pipe 2 and the measuring pipe 4 are respectively inserted into the grouting hole 1 and the measuring hole 3, and then the grouting pipe and the measuring pipe are timely sealed and fixedly connected with the grouting hole and the measuring hole by adopting commonly used expansive cement in a driving roadway.
Grouting material blending: debugging grouting equipment by project members, preparing grouting materials according to the result of grouting parameter optimization analysis, respectively placing two main materials of cement and fly ash into two slurry barrels according to the proportion of 3:7, and uniformly stirring, wherein when water is added and stirred according to the research result of the project, the materials are added and water is added according to the water-solid ratio of 1:1.2, and then the water-solid ratio is 1:1.3, 1:1.4 and 1:1.5 in sequence for fully stirring and mixing;
determining a surrounding rock loosening circle of the coal seam roadway, determining the breaking depth of the side part of the soft broken coal seam roadway by using a surrounding rock loosening circle tester, and specifically determining the breaking depth of the side part of the soft broken coal seam roadway by using a BA-II type surrounding rock loosening circle tester;
grouting: after the grouting slurry is blended and uniformly stirred, placing two slurry suction pipes of a grouting pump into a slurry barrel, controlling the flow rate to meet the proportioning requirement of cement and fly ash, when the slurry flows out of a measuring pipe, stopping grouting temporarily, bending the end of the measuring pipe, fastening the end by using a steel wire, and then continuing grouting; in the grouting process, the grouting pressure P is 2-3 MPa, so that the gas extraction influence radius of which the diffusion radius of the main section of the slurry reaches more than 2 times under the condition of adopting echelon grouting is ensured;
and (3) grouting: when slurry overflows from the coal wall of the measuring field in the grouting process, the grouting is suspended, the grouting is continued after 30min intervals, and the grouting is stopped until the grouting pressure reaches 2.8 MPa;
in order to prevent the grout from being sprayed out without initial setting, the external grouting pipe is forbidden to be immediately removed after the grouting is stopped, and the external grouting pipe and the equipment are removed after the grouting is stabilized for 1 hour
And (3) gas pressure measurement: and after the grouting reinforcement is finished for 24H, the active coal seam gas pressure is measured in the measuring hole.
During measurement, an air pump is started to inflate the plugging device, the plugging device collides and is in sealing fit with the measurement pipe 4, hole sealing of the measurement pipe is achieved, then a driving motor is started, the driving motor drives a screw stud to rotate forwards or reversely, the moving structure moves up and down on the screw stud, and a pressure sensor 902 on the moving mechanism is used for detecting air pressure in the measurement pipe.
Specifically, when the gas is measured on the soft and broken coal body, the three steps of loose ring measurement, echelon grouting reinforcement and gas pressure measurement are carried out one by one in sequence and cannot be crossed; after the echelon grouting reinforcement process is finished, the gas pressure of the coal seam is actively measured for more than 24 hours
The method adopts a double-hole pressure measurement mode, the field experiment method comprises three procedures of measuring the loose circle of the surrounding rock of the soft fractured coal seam roadway, reinforcing the surrounding rock of the coal seam roadway by echelon grouting, and measuring the gas pressure of the active coal seam on the field, wherein the three procedures are sequentially carried out, and the surrounding rock of the soft coal seam roadway is blocked and the fractured crack is strengthened by echelon grouting, so that the gas tightness in the gas pressure measurement process is ensured, and the accurate and efficient measurement of the gas pressure of the soft coal seam is realized. The on-site experiment method can improve the success rate of measuring the gas pressure of the soft and broken coal seam, improve the effect of measuring the gas pressure, and further provide reliable basis for optimizing the gas drainage technological parameters of the soft and broken coal seam. The field experiment method has simple procedure, convenient operation, low cost and high success rate.
The above embodiments are merely examples of the present invention, and do not limit the protection scope of the present invention, and all designs the same as or similar to the present invention belong to the protection scope of the present invention.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921513854.4U CN210396723U (en) | 2019-09-11 | 2019-09-11 | A gas pressure measuring device for double-hole pressure measuring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921513854.4U CN210396723U (en) | 2019-09-11 | 2019-09-11 | A gas pressure measuring device for double-hole pressure measuring |
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| CN210396723U true CN210396723U (en) | 2020-04-24 |
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| CN201921513854.4U Expired - Fee Related CN210396723U (en) | 2019-09-11 | 2019-09-11 | A gas pressure measuring device for double-hole pressure measuring |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279732A (en) * | 2021-01-29 | 2021-08-20 | 西安安森智能仪器股份有限公司 | Compression type diameter-variable plunger |
| CN113324809A (en) * | 2021-05-31 | 2021-08-31 | 西安石油大学 | Trace gas collecting device for oil gas geochemical exploration |
| CN114294063A (en) * | 2021-12-30 | 2022-04-08 | 重庆大学 | Device and method for rapid segmental detection of harmful gas in tunnel surrounding rock |
| CN114922634A (en) * | 2022-05-25 | 2022-08-19 | 中铁一局集团(广州)建设工程有限公司 | Freezing pore-forming construction method in tunnel construction process |
-
2019
- 2019-09-11 CN CN201921513854.4U patent/CN210396723U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279732A (en) * | 2021-01-29 | 2021-08-20 | 西安安森智能仪器股份有限公司 | Compression type diameter-variable plunger |
| CN113324809A (en) * | 2021-05-31 | 2021-08-31 | 西安石油大学 | Trace gas collecting device for oil gas geochemical exploration |
| CN113324809B (en) * | 2021-05-31 | 2022-11-01 | 西安石油大学 | Oil gas geochemical exploration trace gas collection device |
| CN114294063A (en) * | 2021-12-30 | 2022-04-08 | 重庆大学 | Device and method for rapid segmental detection of harmful gas in tunnel surrounding rock |
| CN114922634A (en) * | 2022-05-25 | 2022-08-19 | 中铁一局集团(广州)建设工程有限公司 | Freezing pore-forming construction method in tunnel construction process |
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