CN111502641A - Gas pressure measuring device and gas pressure measuring method - Google Patents
Gas pressure measuring device and gas pressure measuring method Download PDFInfo
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- CN111502641A CN111502641A CN202010342449.1A CN202010342449A CN111502641A CN 111502641 A CN111502641 A CN 111502641A CN 202010342449 A CN202010342449 A CN 202010342449A CN 111502641 A CN111502641 A CN 111502641A
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- grouting
- pipe
- pressure measuring
- gas pressure
- hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The embodiment of the invention provides a gas pressure measuring device and a gas pressure measuring method, and relates to the technical field of gas pressure detection. The gas pressure measuring device comprises a pressure measuring pipe, a first grouting pipe, a grouting bag and a switch device, wherein the head end of the pressure measuring pipe is used for extending into a coal seam, and the tail end of the pressure measuring pipe is connected with an air pressure detecting device; the first grouting pipe is arranged in parallel with the pressure measuring pipe, a plurality of first grouting holes are formed in the first grouting pipe at intervals along the direction of a central line, and a second grouting hole is formed between every two adjacent first grouting holes; the grouting bags wrap the pressure measuring pipe and the first grouting pipes, each first grouting hole is communicated with one grouting bag, and each grouting bag is arranged between the coal seam and the aquifer; and the switch device blocks the second grouting hole and is used for opening the second grouting hole when the pressure in the first grouting pipe reaches a preset value. The concrete that the second slip casting hole flows is direct to be contacted with the lateral wall of pressure measurement drilling, has improved sealed effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of gas pressure detection, in particular to a gas pressure measuring device and a gas pressure measuring method.
Background
In the process of mining coal mines, in order to ensure the safe operation of mining, the gas pressure in the coal seam needs to be detected.
Among the correlation technique, often detect the gas pressure in the coal seam through gas pressure measurement device, gas pressure measurement device includes: pressure-measuring pipe, slip casting pipe and pressure measurement equipment, pressure-measuring pipe and slip casting pipe parallel arrangement and link together, the parcel has two slip casting bags on the pipe wall of slip casting pipe, and two slip casting bags set up along the central line direction interval of slip casting pipe, are provided with the slip casting hole with each slip casting bag intercommunication on the slip casting pipe, the end-to-end connection of atmospheric pressure measurement equipment and pressure-measuring pipe. When using, need set up the pressure measurement drilling on the roof in tunnel, the pressure measurement drilling extends to the coal seam after passing the aquifer, later stretch into the pressure measurement drilling with slip casting pipe and pressure measuring pipe in, the head end of pressure measuring pipe extends to the coal seam, at this moment, the slip casting bag is located between aquifer and the coal seam, later pour into the concrete into the slip casting bag through the slip casting pipe to the pressure measurement drilling between shutoff aquifer and the coal seam, then can acquire the pressure of gas in the coal seam through atmospheric pressure check out test set.
However, the sealing performance between the grouting bag and the pressure measuring drill hole is limited, water from an aquifer can enter a coal bed and further enter the pressure measuring pipe, and therefore gas pressure measured by the air pressure detection equipment is not accurate enough.
Disclosure of Invention
The embodiment of the invention provides a gas pressure measuring device and a gas pressure measuring method, which are used for further improving the plugging effect of the gas pressure measuring device on a pressure measuring drill hole and reducing the influence of water in the pressure measuring drill hole on a pressure measuring result.
On one hand, the embodiment of the invention provides a gas pressure measuring device, which comprises a pressure measuring pipe, a first grouting pipe, a grouting bag and a switch device, wherein the head end of the pressure measuring pipe is used for extending into a coal seam, and the tail end of the pressure measuring pipe is connected with an air pressure detection device; the first grouting pipe and the pressure measuring pipe are arranged in parallel, a plurality of first grouting holes are formed in the first grouting pipe at intervals along the direction of a central line, and a second grouting hole is formed between every two adjacent first grouting holes; the grouting bags wrap the pressure measuring pipe and the first grouting pipes, each first grouting hole is communicated with one grouting bag, and each grouting bag is arranged between a coal seam and a water-bearing stratum; the switch device blocks the second grouting hole and is used for opening the second grouting hole when the pressure in the first grouting pipe reaches a preset value.
The gas pressure measuring device comprises a first grouting hole, a second grouting hole, a first switch device, a second switch device and a second switch device, wherein the first grouting hole is communicated with the second grouting hole, the second grouting hole is communicated with the first grouting hole, and the first grouting hole is communicated with the second grouting hole.
The gas pressure measuring device as described above, wherein the rupture disk is a plastic sheet, and the plastic sheet is connected to the first grouting pipe by an adhesive.
The gas pressure measuring device further comprises a second grouting pipe, the second grouting pipe is arranged in parallel with the pressure measuring pipe, and the head end of the second grouting pipe is located between the aquifer and the opening of the pressure measuring drill hole.
The gas pressure measuring device further comprises a third grouting pipe, the third grouting pipe is arranged in parallel with the pressure measuring pipe, and the head end of the third grouting pipe is located between the head end of the second grouting pipe and the grouting bag.
The gas pressure measuring apparatus according to the above, wherein a head end of the third grouting pipe is located on a side of the aquifer facing the air pressure detection device.
The gas pressure measuring device as described above, wherein the end of the first grouting pipe, the end of the second grouting pipe, and the end of the third grouting pipe are provided with closing valves.
The gas pressure measuring device as described above, wherein the grouting bag is a cylindrical bag with openings at two ends, and is sleeved on the pressure measuring pipe and the first grouting pipe, and two ends of the grouting bag are hermetically connected to outer walls of the pressure measuring pipe and the first grouting pipe.
The gas pressure measuring device according to the above, wherein the first injection hole is located in the inner space of the injection bag near the head end of the pressure measuring pipe.
On the other hand, the embodiment of the invention also provides a gas pressure measuring method, and any one of the gas pressure measuring devices is adopted for measuring the pressure.
According to the gas pressure measuring device and the gas pressure measuring method provided by the embodiment of the invention, the first grouting pipes are arranged in parallel with the pressure measuring pipe, a plurality of first grouting holes are arranged on the first grouting pipes at intervals along the direction of a central line, a second grouting hole communicated with the first grouting pipes is arranged between every two adjacent first grouting holes, the pressure measuring pipe and the first grouting pipes are wrapped by a plurality of grouting bags, each grouting bag is communicated with one first grouting hole, and the second grouting holes are sealed by the switch device; concrete is injected into a grouting bag arranged between the aquifer and the coal bed through a first grouting hole arranged on a first grouting pipe, the grouting bag expands along with the increase of the concrete inside and finally abuts against the inner wall of the pressure measuring drill hole so as to prevent water in the aquifer from entering the coal bed; and then the grouting pressure is increased to cause a switch device arranged on the second grouting hole to be opened, so that the concrete flows out of the second grouting hole. Concrete flowing out of the second grouting hole is filled between the two adjacent grouting bags, and the concrete flowing out of the second grouting hole directly contacts with the side wall of the pressure measuring drill hole, so that the sealing performance between the first grouting pipe and the pressure measuring drill hole is improved, the water-containing layer is further prevented from entering the coal bed, and the accuracy of the gas pressure measuring device is improved. In addition, because the switching device is opened when the pressure in the first grouting pipe reaches the preset pressure, the pressure of concrete flowing into the space between the adjacent grouting bags is large, and the sealing performance between the first grouting pipe and the pressure measuring drill hole can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a gas pressure measuring device according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a gas pressure measuring device according to an embodiment of the present invention being installed in a pressure measuring drill hole;
fig. 3 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the first grouting is completed;
fig. 4 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the second grouting is completed;
fig. 5 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the third grouting;
fig. 6 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after fourth grouting;
fig. 7 is a schematic view illustrating pressure measurement performed by the gas pressure measurement device according to the embodiment of the present invention;
fig. 8 is a first flowchart of a gas pressure measuring method according to an embodiment of the present invention;
fig. 9 is a second flowchart of a gas pressure measuring method according to an embodiment of the present invention.
Description of reference numerals:
100-gas pressure measuring device;
200-coal seam;
300-an aqueous layer;
1-piezometric tube;
11-pressure measuring hole;
2-a first grouting pipe;
21-first grouting holes;
22-second grouting holes;
3-grouting bags;
3 a-a first slip;
3 b-a second slip;
31-adjusting the band;
32-a ribbon;
4-a switching device;
4 a-a third slip;
5-fastening a belt;
6-a second grouting pipe;
6 a-a fourth slip;
7-a third grouting pipe;
7 a-a fifth slip;
8-a closing valve;
9-air pressure detection equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In the present invention, unless otherwise specifically stated, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The coal bed gas pressure refers to an acting force generated by free thermal motion impact of gas molecules in coal bed pores, is a basic parameter for judging the coal bed gas content and coal bed gas dynamic characteristics, and is also a main index for evaluating whether coal and gas outburst danger exists in coal mining activities (the outburst danger exists when the gas pressure P is more than or equal to 0.74 MPa), so the coal bed gas pressure needs to be measured frequently in the coal mining activities.
The method for measuring the gas pressure of the coal bed comprises the following steps: a pressure measuring drill hole is drilled into a coal seam from an underground rock tunnel, one end, provided with a pressure measuring hole, of a pressure measuring pipe is explored into the pressure measuring drill hole, and the other end of the pressure measuring pipe is connected with an air pressure detection device, so that stable air pressure in the pressure measuring drill hole is obtained, and the gas pressure is presumed. During downhole borehole pressure measurement, sandstone water penetrates into the pressure measurement borehole along the surrounding rock fractures as the pressure measurement borehole penetrates the aquifer in which the fractures develop. In the actual operation process, in order to prevent that sandstone water from following the pressure measurement drilling and getting into the tunnel, can carry out the shutoff to the drill way department of pressure measurement drilling usually, therefore water in the pressure measurement drilling can not discharge, again because gas pressure measurement process time is longer, water level in the pressure measurement drilling can constantly rise, finally can get into the pressure measurement region at pressure measurement hole place, and then lead to the pressure-measuring pipe to intake, it is big that the pressure numerical value of installing the terminal atmospheric pressure check out test set reading of pressure-measuring pipe receives downthehole water column pressure influence, the serious distortion of data.
Among the correlation technique, in order to solve the problem of the pressure measurement data distortion that the piezometric tube intake leads to, provide a gas pressure measurement device, gas pressure measurement device includes: pressure-measuring pipe, slip casting pipe and pressure measurement equipment, pressure-measuring pipe and slip casting pipe parallel arrangement and link together, the parcel has two slip casting bags on the pipe wall of slip casting pipe, and two slip casting bags set up along the first direction interval of the central line of slip casting pipe, are provided with the slip casting hole with each slip casting bag intercommunication on the slip casting pipe, the end-to-end connection of atmospheric pressure check out test set and pressure-measuring pipe. When using, need set up the pressure measurement drilling on the roof in tunnel, the pressure measurement drilling extends to the coal seam after passing the aquifer, later stretch into the pressure measurement drilling with slip casting pipe and pressure measurement pipe in, the head end of pressure measurement pipe extends to the coal seam, at this moment, the slip casting bag is located between aquifer and the coal seam, later pour into the concrete into the slip casting bag through the slip casting pipe, with the pressure measurement drilling between shutoff aquifer and the coal seam, prevent the water in the pressure measurement drilling and get into in the pressure measurement district, then can acquire the pressure of gas in the coal seam through atmospheric pressure detection equipment.
However, in the practical application process, the grouting bag needs to have enough strength to ensure that the grouting bag is not damaged after the interior of the grouting bag is filled with concrete, and needs to have enough flexibility to ensure that the grouting bag can be well attached to the inner wall of the pressure measuring drill hole to ensure the sealing property. However, due to the limitation of the material of the existing grouting bag, the strength and the flexibility of the grouting bag cannot be well considered, and in addition, the viscosity of concrete in the grouting bag is high, the flowability of the concrete is poor, so that the sealing effect between the grouting bag and the inner wall of the pressure measurement drilling hole is not ideal, and a gap still exists between the grouting bag and the inner wall of the pressure measurement drilling hole. This makes the water in the pressure measurement drilling still can follow the gap entering pressure measurement area between slip casting bag and the pressure measurement drilling inner wall, and then influences the pressure measurement result.
In view of this, the embodiment of the invention provides a gas pressure measuring device, which enables concrete to directly contact with the inner wall of a pressure measuring drill hole without being bound by a grouting bag in the process of plugging the pressure measuring drill hole, so that the fitting degree of the concrete and the inner wall of the pressure measuring drill hole is better, and the sealing property is improved.
The following describes a gas pressure measuring device and a gas pressure measuring method according to embodiments of the present invention with reference to the accompanying drawings.
Example one
Fig. 1 is a schematic view of a gas pressure measuring device according to an embodiment of the present invention; fig. 2 is a schematic view illustrating a gas pressure measuring device according to an embodiment of the present invention being installed in a pressure measuring drill hole; fig. 3 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the first grouting is completed; fig. 4 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the second grouting is completed; fig. 5 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after the third grouting; fig. 6 is a schematic view of the gas pressure measuring device according to the embodiment of the present invention after fourth grouting; fig. 7 is a schematic view illustrating pressure measurement performed by the gas pressure measurement device according to the embodiment of the present invention.
For convenience, the following description of the components of the gas pressure measuring device will refer to the end of the pressure measuring bore hole facing the bottom of the hole as the head end and the end facing the bore hole as the tail end.
As shown in fig. 1 to 7, an embodiment of the present invention provides a gas pressure measuring device 100, which includes a first grouting pipe 2, a grouting bag 3, and a switching device 4, which are disposed in a pressure measuring borehole and used for plugging the pressure measuring borehole, an air pressure detecting device 9 disposed outside the pressure measuring borehole, and a pressure measuring pipe 1 disposed in the pressure measuring borehole and used for communicating a pressure measuring area with the air pressure detecting device 9.
The gas pressure detecting device 9 is a device capable of detecting the pressure of gas, and may be an instrument including a gas pressure sensor (e.g., an electronic pressure gauge) or a mechanical instrument including a sensing element (e.g., a pressure gauge).
The pressure measuring zone refers to a zone in the coal seam 200 where the pressure measuring drill is located, so that gas can enter the zone from the coal seam 200, and the gas pressure measuring device 100 measures the gas pressure in the zone.
Pressure-measuring pipe 1 is the hollow tube usually, sets up pressure cell 11 on the pressure-measuring pipe is close to the lateral wall of head end, and pressure-measuring pipe 1 extends along the central line direction of pressure measurement drilling to make pressure cell 11 be located pressure measurement area, the pressure measurement area just can communicate with air pressure detection equipment 9 through pressure-measuring pipe 1 like this, and the gas that comes from the coal seam can enter into in the pressure-measuring pipe through the pressure cell, later enters into check out test set through pressure-measuring pipe again in, makes air pressure detection equipment 9 can survey the gas pressure in the pressure measurement area. Illustratively, the pressure measuring pipe 1 can be a steel hollow pipe with an outer diameter of 50mm, the length of the steel hollow pipe is equal to the depth of a pressure measuring drill hole, the head end of the pressure measuring pipe 1 is closed, and a plurality of pressure measuring holes 11 are formed in the side wall of the pressure measuring pipe 1 in a coal seam; the pressure measuring hole and the closed end of the pressure measuring pipe facing the bottom of the pressure measuring drilling hole can have a preset distance, the preset distance can be 0.1m-1m, and the preset distance can be 0.5 m.
The first grouting pipe 2 and the pressure measuring pipe 1 are arranged in parallel, a plurality of first grouting holes 21 are arranged on the first grouting pipe 2 at intervals along the direction of a central line, and a second grouting hole 22 is arranged between every two adjacent first grouting holes 21. The first grouting pipe 2 has a closed head end and a closed tail end connected with grouting equipment, so that concrete from the grouting equipment can only flow out of the first grouting hole 21 or the second grouting hole 22. In an realizable manner, a second grouting hole may be disposed between two adjacent first grouting holes, for example, two or more first grouting holes 21 may be disposed, for example, when there are two first grouting holes 21, a second grouting hole 22 is disposed between two grouting holes; when the number of the first injection holes 21 is three, the second injection holes 22 are provided in both of two spaced areas formed by the three first injection holes 21. In other implementation manners, a spacing region is arranged between every two adjacent first grouting holes, and when the number of the spacing regions is multiple, second grouting holes can be arranged on the first grouting pipes corresponding to one or more spacing regions; for example, when three first injection holes may be provided on the first injection pipe, the corresponding first injection pipe may have two spaced regions, and in this case, the second injection hole 22 may be provided in one of the two spaced regions.
For convenience, the following embodiments are described by taking the provision of two first grout holes 21 as an example. Similarly, the number of the second grouting holes 22 may be one, or two or more, and the following embodiments are described by taking the case where one second grouting hole 22 is provided as an example. Optionally, the length of the first grout pipe 2 is equal to the length of the pressure bore hole to the edge of the coal seam 200 near the aquifer, so that the portion of the pressure bore hole corresponding to the coal seam 200 is not grouted. Illustratively, the first grouting pipe 2 is a steel grouting pipe with the outer diameter of phi 50mm, the head end of the steel grouting pipe is closed, and the first grouting pipe and the pressure measuring pipe 1 are bound together through a fastening belt 5. The fastening band 5 refers to a band-attached member, such as a band, a tie, a band, or the like, capable of fixing the first grout tube 2 and the pressure measuring tube 1 together by bundling. Of course, in this embodiment, the first grouting pipe and the pressure measuring pipe may be connected by welding or bolt connection, and the connection manner between the first grouting pipe and the pressure measuring pipe is not limited in this embodiment.
It should be noted that "parallel" as used herein and below means substantially the same direction, for example, the direction of the first grout pipe 2 and the direction of the pressure measuring pipe 1 are substantially the same, so that the first grout pipe 2 and the pressure measuring pipe 1 can be installed at the preset position of the pressure measuring borehole without installation failure due to the distance between the first grout pipe 2 and the pressure measuring pipe 1 being larger than the diameter of the pressure measuring borehole.
Slip casting bag 3 parcel pressure-measuring pipe 1 and first slip casting pipe 2 to make slip casting bag 3 and 1 outer wall of pressure-measuring pipe, the 2 outer walls of first slip casting pipe inject an accommodation space jointly. Optionally, the grouting bag 3 is a cylindrical bag with two open ends, and is sleeved on the pressure measuring pipe 1 and the first grouting pipe 2, and the two ends are fastened on the outer walls of the pressure measuring pipe 1 and the first grouting pipe 2. For example, the grouting bag 3 is a cylindrical woven bag with two open ends, and is sleeved on the pressure measuring pipe 1 and the first grouting pipe 2, one end of the grouting bag is tied on the pressure measuring pipe 1 and the first grouting pipe 2 through an adjusting band 31, and the other end of the grouting bag is tied on the pressure measuring pipe 1 and the first grouting pipe 2 through a binding band 32. The adjusting strap 31 refers to a fastening member (e.g., a hook and loop fastener) that can be repeatedly detached, so that the position of the injection bag 3 can be conveniently adjusted.
First slip casting hole 21 is located this accommodation space, makes first slip casting pipe 2 and accommodation space intercommunication, thereby the concrete in first slip casting pipe 2 can get into the accommodation space through first slip casting hole 21 and make slip casting bag 3 inflation like this, and then with the laminating of pressure measurement drilling inner wall. Optionally, the first grouting hole 21 is located in a position, close to the head end of the piezometer tube, of the inner space of the grouting bag 3, so that the grouting bag 3 is gradually filled with concrete under the action of gravity after the concrete enters the grouting bag 3, and the filling effect is better.
Each grouting bag 3 is located between the coal seam 200 and the aquifer 300 after the installation is completed. Optionally, the distance between the two grouting bags 3 is equal to the distance between the upper edge of the aquifer 300 and the lower edge of the coal seam 200 minus the length of the two grouting bags 3, so that the pressure measuring holes are blocked at the lower edge of the coal seam 200 and the upper edge of the aquifer 300 respectively, and the effect is better. Further, the distance between the two grouting bags 3 is larger than 2m, so that the sealing effect is better, and grouting is conveniently performed in the space between the two grouting bags through the second grouting holes.
The switch device 4 is arranged on the second grouting hole 22 to block the second grouting hole 22, that is, the second grouting hole 22 is closed in the initial state, the concrete in the first grouting pipe 2 can not flow out from the second grouting hole 22, so that the grouting can be started by injecting the concrete into the grouting bags 3 only through the first grouting hole 21, two closed barriers of the first grouting body 3a and the second grouting body 3b are formed by the two grouting bags 3, and a space is defined between the first grouting body 3a and the second grouting body 3b and is used for accommodating a third grouting body 4a formed by grouting through the second grouting hole. Switch device 4 opens second slip casting hole 22 when the pressure in first slip casting pipe 2 reachs the default, concrete in first slip casting pipe 2 can get into the pressure measurement drilling through second slip casting hole 22 like this, begin the slip casting for the second time, and then form third slip casting body 4a, the concrete that pours into through the second slip casting hole is abundant with the pore wall contact of pressure measurement drilling, and the pressure of concrete is higher, make third slip casting body 4a can further the pressure measurement drilling, in order to further improve the shutoff effect of pressure measurement drilling.
The switch device 4 can be a burst valve with a pressure relief function, and can also comprise a burst disc, when the switch device 4 comprises the burst disc, the burst disc is covered on the second grouting hole 22 to seal the second grouting hole 22 in an initial state, when the pressure in the first grouting pipe 2 reaches a preset value, the burst disc is broken to eliminate the sealing of the second grouting hole 22, and the disposable structural cost is lower.
Illustratively, the concrete can be special quick-setting hole sealing cement, the material is P.S 32.5 slag portland cement, water: ash: setting accelerator ratio of 0.75: 1: 0.05. in the grouting process, a pneumatic grouting pump can be adopted, the grouting pressure is adjusted to be 1.2MPa, the special quick-setting hole sealing cement is injected into the grouting bag through the first grouting hole 21, grouting is continuously carried out after the grouting bag is full, the grouting pressure is continuously increased, the plastic film is broken, secondary grouting is started, and after the grouting pressure is stabilized at 2MPa and continuously stabilized for 5min, secondary grouting is finished.
In the gas pressure measuring device 100 provided by this embodiment, the first grouting pipes 2 are arranged in parallel with the pressure measuring pipe 1, a plurality of first grouting holes 21 are arranged on the first grouting pipes 2 at intervals along the direction of the central line, a second grouting hole 22 communicated with the first grouting pipe 2 is arranged between two adjacent first grouting holes 21, the pressure measuring pipe 2 and the first grouting pipes 2 are wrapped by a plurality of grouting bags 3, each grouting bag 3 is communicated with one first grouting hole 21, and the second grouting hole 22 is blocked by the switch device 4; injecting concrete into the grouting bag 3 disposed between the aquifer 200 and the coal seam 300 through the first grouting hole 21 provided on the first grouting pipe 2, the grouting bag 3 expanding with the increase of the internal concrete and finally abutting against the inner wall of the pressure measuring borehole to prevent the water in the aquifer 200 from entering the coal seam; the grouting pressure is then increased, causing the opening and closing means 4 provided on the second grouting hole 22 to open, so that the concrete flows out of the second grouting hole 22. Concrete flowing out of the second grouting holes 22 is filled between the two adjacent grouting bags 3, and the concrete flowing out of the second grouting holes is directly contacted with the side wall of the pressure measuring drill hole, so that the sealing performance between the first grouting pipe 2 and the pressure measuring pipe 1 and the pressure measuring drill hole is improved, the water-containing layer is further prevented from entering a coal bed, and the accuracy of the gas pressure measuring device 100 is improved.
In addition, because the switching device 4 is opened when the pressure in the first grouting pipe 2 reaches the preset pressure, the pressure of the concrete flowing into the space between the adjacent grouting bags 3 is higher, and the sealing performance between the first grouting pipe 2 and the pressure measuring pipe 1 and the pressure measuring drill hole can be further improved.
Optionally, the gas pressure measuring device 100 further includes a second grouting pipe 6 for third grouting, the second grouting pipe 6 is arranged in parallel with the pressure measuring pipe 1, and a head end of the second grouting pipe 6 is located between the aquifer 300 and the opening of the pressure measuring drill hole. The second grouting pipe 6 is a hollow pipe with an open head end, the tail end of the second grouting pipe is connected with grouting equipment, and concrete is injected into the pressure measuring drill hole through the open hole at the head end during third grouting. In practical implementation, the second grouting pipe 6 may be tied to the pressure measuring pipe 1 and the first grouting pipe 2 by means of a fastening band 5 or the like, and a concrete blocking member (for example, a gunny bag or a cotton yarn is wound around the second grouting pipe 6 and polyurethane is poured into the second grouting pipe 6 at a position close to the orifice of the pressure measuring borehole, then the second grouting pipe is rapidly fed into the pressure measuring borehole and stands still for 3 to 5 minutes, polyurethane foam is formed to block the orifice) to block the concrete from the second grouting pipe 6, and the fourth grouting body 6a formed by injecting the second grouting pipe 6 not only can prevent the water in the pressure measuring borehole from flowing into the roadway from the orifice, but also can define a closed region for containing a fifth grouting body 7a (described below) together with the second grouting body.
Optionally, the gas pressure measuring device 100 further includes a third grouting pipe 7 for fourth grouting, the third grouting pipe 7 is arranged in parallel with the pressure measuring pipe 1, the third grouting pipe 7 may be a hollow pipe with an open head end, the end of the hollow pipe is connected to a grouting device, and concrete is injected into the pressure measuring drill hole through the open hole at the head end during fourth grouting. The head end of the third grouting pipe 7 is positioned between the head end of the second grouting pipe 6 and the grouting bag 3. Like this, the part that corresponds with aquifer 300 in can will measuring the borehole inner wall of pressure through the fifth slip casting 7a of third slip casting 7 injection completely shutoff, consequently can prevent the water in the aquifer 300 and permeate the pressure measurement borehole through the inner wall of pressure measurement borehole, has eliminated the ponding problem of pressure measurement borehole, has solved the influence of water in the gas pressure measurement process from the root.
Optionally, the head end of the third grouting pipe 7 is located at the lower edge of the aquifer 300. Thus, the concrete consumption of the fourth grouting can be reduced while the position corresponding to the aquifer 300 in the inner wall of the pressure measuring drill hole is blocked.
When the gas pressure measuring device 100 simultaneously includes the second grouting pipe 6 and the third grouting pipe 7, the third grouting and the fourth grouting processes are as follows: when the third grouting is started, firstly, concrete is injected into the pressure measuring drill hole through the second grouting pipe 6, the concrete is accumulated under the action of a concrete blocking piece arranged at the tail end of the second grouting pipe 6, the third grouting is finished when the concrete does not pass through the third grouting pipe 7, the fourth grouting is started after the concrete is solidified to form a fourth grouting body 6a, the concrete is injected into the pressure measuring drill hole through the third grouting pipe 7, the fourth grouting is finished after the pressure is maintained for a period of time after the third grouting pipe 7 is filled, and the fifth grouting body 7a is formed after the fourth grouting body is solidified.
Optionally, the end of the first injection pipe 2, the end of the second injection pipe 6 and the end of the third injection pipe 7 are respectively provided with a closing valve 8. After grouting is completed through the first grouting pipe 2, the second grouting pipe 6 and the third grouting pipe 7, concrete in the pipes is still not solidified and is in a fluid state, and therefore the sealing valve 8 is arranged to prevent the concrete from flowing backwards. In practical application, after grouting is completed, the closing valve 8 is closed first, and then the grouting pump is closed.
In the pressure measurement process, the pressure measurement pipe 1, the first grouting pipe 2, the second grouting pipe 6, the third grouting pipe 7 and the grouting bags 3 stretch into the pressure measurement drill hole, the pressure measurement hole 11 is located at the position corresponding to the coal seam 200, the two grouting bags 3 are located between the water-bearing layer 300 and the coal seam 200, the head end of the third grouting pipe 7 is located on one side of the water-bearing layer 200, which faces the air pressure detection equipment 9, and the head end of the second grouting pipe 6 is located between the head end of the third grouting pipe 7 and the pressure measurement drill hole orifice. And (3) grouting into the first grouting pipe 2, firstly, filling concrete in the first grouting pipe 2 into the two grouting bags 3 through the first grouting hole 21, and gradually expanding the two grouting bags 3 along with the increase of the concrete in the first grouting pipe and fitting the two grouting bags with the pressure measuring drill holes to form a first grouting body 3a and a second grouting body 3 b. Then, the grouting pressure is adjusted to a preset value, so that the plastic film covering the second grouting hole 22 is broken, and concrete enters the area between the two grouting bags 3 through the second grouting hole 22 to form a third grouting 4 a. The pressure measuring drill hole is plugged by arranging a concrete blocking piece before the third grouting is started, then concrete is injected into the pressure measuring drill hole through the second grouting pipe 6, the concrete accumulates under the action of the concrete blocking piece arranged at the tail end of the second grouting pipe 6, the third grouting is finished when the concrete does not pass through the third grouting pipe 7, the fourth grouting is started after the concrete is solidified to form a fourth grouting body 6a, the concrete is injected into the pressure measuring drill hole through the third grouting pipe 7, the fourth grouting is finished after the pressure is maintained for a period of time after the third grouting pipe 7 is filled, and the fifth grouting body 7a is formed by the fourth poured concrete.
Example two
Fig. 8 is a first flowchart of a gas pressure measuring method according to an embodiment of the present invention; fig. 9 is a second flowchart of a gas pressure measuring method according to an embodiment of the present invention.
As shown in fig. 8, an embodiment of the present invention provides a method for measuring pressure of gas, including:
s100, performing primary grouting through a first grouting pipe and a grouting bag.
S200, performing secondary grouting through the first grouting pipe and the switch device.
S300, acquiring gas pressure through a piezometer tube 1.
As shown in fig. 1 to 7, in the gas pressure measurement method according to the embodiment of the present invention, in the gas pressure measurement device 100 according to the embodiment, the first grouting pipe 2 is arranged in parallel to the pressure measurement pipe 1, a plurality of first grouting holes 21 are arranged on the first grouting pipe 2 at intervals along the central line direction, a second grouting hole 22 communicated with the first grouting pipe 2 is arranged between two adjacent first grouting holes 21, the pressure measurement pipe 2 and the first grouting pipe 2 are wrapped by the plurality of grouting bags 3, each grouting bag 3 is communicated with one first grouting hole 21, and the second grouting hole 22 is blocked by the switch device 4; injecting concrete into the grouting bag 3 disposed between the aquifer 200 and the coal seam 300 through the first grouting hole 21 provided on the first grouting pipe 2, the grouting bag 3 expanding with the increase of the internal concrete and finally abutting against the inner wall of the pressure measuring borehole to prevent the water in the aquifer 200 from entering the coal seam; the grouting pressure is then increased, causing the opening and closing means 4 provided on the second grouting hole 22 to open, so that the concrete flows out of the second grouting hole 22. Concrete flowing out of the second grouting holes 22 is filled between the two adjacent grouting bags 3, and the concrete flowing out of the second grouting holes is directly contacted with the side wall of the pressure measuring drill hole, so that the sealing performance between the first grouting pipe 2 and the pressure measuring pipe 1 and the pressure measuring drill hole is improved, the water-containing layer is further prevented from entering a coal bed, and the accuracy of the gas pressure measuring device 100 is improved.
In addition, because the switching device 4 is opened when the pressure in the first grouting pipe 2 reaches the preset pressure, the pressure of the concrete flowing into the space between the adjacent grouting bags 3 is higher, and the sealing performance between the first grouting pipe 2 and the pressure measuring pipe 1 and the pressure measuring drill hole can be further improved.
As shown in fig. 9, in some embodiments, the gas pressure measuring method includes:
s100, performing primary grouting through a first grouting pipe and a grouting bag.
S200, performing secondary grouting through the first grouting pipe and the switch device.
And S400, performing third grouting through a second grouting pipe.
And S500, performing fourth grouting through a third grouting pipe.
S300, acquiring gas pressure through a piezometer tube.
Like this, the fourth slip casting body 6a that forms through the third slip casting can inject a confined area together with second slip casting body 3b for carry out the fourth slip casting, and the fifth slip casting body 7a of pouring through third slip casting pipe 7 can be with the partial complete shutoff that corresponds with aquifer 300 in the pressure measurement drilling inner wall, consequently can prevent that the water in the aquifer 300 from permeating the pressure measurement drilling through the inner wall of pressure measurement drilling, has eliminated the ponding problem of pressure measurement drilling, has solved the influence of water in the gas pressure measurement process from the root.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a gas pressure measurement device which characterized in that includes: a pressure measuring pipe, a first grouting pipe, a grouting bag and a switch device,
the head end of the pressure measuring pipe is used for extending into a coal seam, and the tail end of the pressure measuring pipe is connected with air pressure detection equipment;
the first grouting pipe and the pressure measuring pipe are arranged in parallel, a plurality of first grouting holes are arranged on the first grouting pipe at intervals along the direction of a central line, and a second grouting hole is arranged between every two adjacent first grouting holes;
the grouting bags wrap the pressure measuring pipe and the first grouting pipes, each first grouting hole is communicated with one grouting bag, and each grouting bag is arranged between a coal seam and a water-bearing stratum;
the switch device blocks the second grouting hole and is used for opening the second grouting hole when the pressure in the first grouting pipe reaches a preset value.
2. The gas pressure measuring device according to claim 1, wherein the switching device includes a rupture disk, the rupture disk is covered on the second grouting hole, and the rupture disk is configured to rupture when the pressure in the first grouting pipe reaches the preset value.
3. The gas pressure measuring device according to claim 2, wherein the rupture disk is a plastic sheet, and the plastic sheet is connected to the first grouting pipe by an adhesive glue.
4. The gas pressure measuring device according to any one of claims 1 to 3, further comprising a second grouting pipe, the second grouting pipe being arranged in parallel with the pressure measuring pipe, a head end of the second grouting pipe being located between the aquifer and an opening of the pressure measuring bore.
5. The gas pressure measuring device according to claim 4, further comprising a third grouting pipe, wherein the third grouting pipe is arranged in parallel with the pressure measuring pipe, and the head end of the third grouting pipe is located between the head end of the second grouting pipe and the grouting bag.
6. The gas pressure measuring device according to claim 5, wherein the head end of the third grouting pipe is located on a side of the aquifer facing away from the coal seam.
7. The gas pressure measuring device according to claim 5, wherein the end of the first grouting pipe, the end of the second grouting pipe, and the end of the third grouting pipe are provided with closing valves.
8. The gas pressure measuring device according to any one of claims 1 to 3, wherein the grouting bag is a cylindrical bag with openings at two ends, is sleeved on the pressure measuring pipe and the first grouting pipe, and is hermetically connected to the outer walls of the pressure measuring pipe and the first grouting pipe at two ends.
9. The gas pressure measuring device according to any one of claims 1 to 3, wherein the first grout hole is located in an inner space of the grout bag at a position near a head end of the pressure measuring pipe.
10. A method for measuring a gas pressure, characterized in that the pressure is measured using the gas pressure measuring apparatus according to any one of claims 1 to 9.
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Application publication date: 20200807 |