CN212154846U - Secondary grouting plugging device in drilling - Google Patents
Secondary grouting plugging device in drilling Download PDFInfo
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- CN212154846U CN212154846U CN202020670162.7U CN202020670162U CN212154846U CN 212154846 U CN212154846 U CN 212154846U CN 202020670162 U CN202020670162 U CN 202020670162U CN 212154846 U CN212154846 U CN 212154846U
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Abstract
The utility model discloses a secondary grouting plugging device in a drill hole, which comprises an injection pipe consisting of a plurality of single-section pipes which are connected in sequence, wherein each single-section pipe comprises a gas injection pipe and a grouting pipe, the grouting pipe is sleeved inside the gas injection pipe, the grouting pipe is connected with the grouting pipe, and the gas injection pipe is connected with the gas injection pipe; the inner ends of the plurality of connected gas injection pipes extend out of the inner end of the gas extraction pipe and cross a fracture area of the drill hole, and are connected and communicated with the inner end air bag; a plurality of gas injection pipes of the injection pipe are positioned at one end of a drilling inlet and connected with gas supply equipment, and a plurality of grouting pipes of the injection pipe are positioned at one end of the drilling inlet and connected with grouting equipment. The utility model discloses the device can carry out accurate area to the position is grown to inefficacy drilling crack and press the slip casting to the activation resumes gas drainage inefficacy drilling and takes out the function of taking out, improves gas drainage concentration and pure quantity.
Description
Technical Field
The utility model relates to a gas drainage technical field, in particular to secondary slip casting plugging device in drilling.
Background
The leakage of the borehole mainly includes two forms, i.e., in-hole leakage and out-of-hole leakage. As shown in FIG. 1, the in-hole gas leakage exists in the area between the extraction pipe and the wall of the borehole, and comprises the gas leakage of the sealing body material and the gas leakage of the gap between the sealing body and the wall of the borehole. The leakage gas outside the hole exists in the crack area outside the wall of the drill hole, and the outside air enters the coal body through the cracks around the drill hole under the action of negative pressure. In order to more comprehensively analyze the reason of gas extraction concentration attenuation, the gas leakage in the hole and the gas leakage outside the hole need to be comprehensively considered, so that a scientific basis is provided for the sealing technology of the drill hole. In the past, it is generally thought that in the process of sealing a drill hole, the in-hole gas leakage caused by the factors of the existence of pores or shrinkage of a sealing body material, loose contact with the wall of the drill hole and the like is a main cause of the gas leakage of the drill hole, and in recent years, along with the improvement of the performance of a hole sealing material, the gas leakage of cracks around the drill hole (gas leakage outside the hole) becomes a main cause of extraction failure under the condition of high-negative-pressure extraction under the influence of drilling construction, roadway driving, working face back-mining pressure and the like.
In the process of gas extraction, extraction negative pressure is formed at the bottom of an extraction pipe, so that pressure difference between the inside and the outside of a drill hole is caused, power is provided for air outside the hole to flow into the drill hole, the air can enter the inside of the drill hole from coal body cracks under the action of the pressure difference, and two paths for the air to enter the drill hole are mainly provided:
1) and (3) unloading and pressing the tunnel: in the range of a roadway pressure relief zone, the coal body is broken, and the cracks are expanded and communicated;
2) plastic zone around the bore: the permeability of the coal body in this region increases significantly due to the reduced stress.
The main reason of gas extraction failure is the leakage of a drill hole, and the gas extraction failure is divided into the leakage of a coal wall on one side of a roadway and the leakage of a hole sealing section of the drill hole according to reasons and forms. The air leakage form of the coal wall on one side of the roadway comprises a drilling axial roadway coal wall crushing air leakage zone and a drilling radial surrounding rock air leakage ring; the hole sealing section has poor sealing effect and generates a gas leakage channel which is divided into two parts, namely gas leakage of the hole sealing material and gas leakage of a hole sealing material and a hole wall contact surface.
The existing hole sealing technologies such as hole sealing by a hole sealing device and capsule hole sealing have certain defects, wherein the hole sealing device of the hole sealing device is heavy and inconvenient to operate, the hole sealing device of the hole sealing device is used for drilling holes on the side of a coal seam roadway, the hole sealing effect is often poor due to the fact that the shape of the drilled hole is difficult to keep regular round and the hole wall is broken, the hole sealing quality is difficult to guarantee, and therefore the hole sealing device is generally only suitable for temporary extraction hole sealing; the capsule hole sealing device has high labor intensity and expensive cost when used, and is almost useless for sealing the development and expansion of cracks.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problem that exists among the above-mentioned prior art, provide a secondary slip casting plugging device in drilling, can carry out accurate area pressure slip casting to inefficacy drilling crack development position to the activation resumes gas drainage inefficacy drilling and takes out the function of taking out, improves gas drainage concentration and pure quantity.
The technical scheme of the utility model is that: a secondary grouting plugging device in a drilled hole comprises a plurality of single-section pipes, wherein each single-section pipe comprises a gas injection pipe and a grouting pipe; the multiple single-section pipes are sequentially connected end to form the injection pipe, wherein the injection pipes of two adjacent single-section pipes are connected, and the gas injection pipes of two adjacent single-section pipes are connected; the injection pipe is inserted from the gas extraction pipe when secondary grouting plugging is carried out on a drilled hole, the inner ends of the connected gas injection pipes extend out of the inner end of the gas extraction pipe and cross a crack area of the drilled hole and are connected and communicated with the inner end air bag, the inner end air bag is used for sealing the drilled hole parts of the inner ends of the gas injection pipes after the gas injection pipes are inflated, the positions of the connected gas injection pipes, which are positioned at the inner ends of the gas extraction pipes, are connected and communicated with the outer end air bag, and the outer end air bag is used for sealing an annular space gap between the gas injection pipes and the gas extraction pipes after the gas injection pipes are inflated; a sealing body used for sealing an annular space gap between the drill hole and the gas extraction pipe is further arranged at one end of the gas extraction pipe and the inlet of the drill hole; many gas injection pipes of filling tube are located drilling entry one end and are connected with air feeder, and many slip casting pipes of filling tube are located drilling entry one end and are connected with slip casting equipment.
The gas injection pipe and the slip casting pipe of each above-mentioned single section pipe are established the concentric reducing pipe together for the cover, and the connecting piece between two pipes is annular metal end cap, all sets up a metal end cap at the both ends of each single section pipe, wherein is equipped with the internal thread on the annular inside wall of metal end cap, is equipped with the matching on the lateral wall of slip casting pipe the internal screw thread, through the spiro union of internal and external screw thread for the annular space that is located metal end cap department of gas injection pipe and slip casting pipe is sealed to the metal end cap, has wherein seted up the air vent on the terminal surface of metal end cap.
The inner ends of the plurality of gas injection pipes are provided with connecting joints, each connecting joint comprises two ports, one port is connected with the inner end airbag, and the other port is connected with the slurry output ends of the plurality of slurry injection pipes and used for outputting slurry through the slurry injection pipes.
The gas injection pipe and the slip casting pipe of the one end of each single-section pipe are provided with external threads, the gas injection pipe and the slip casting pipe of the other end of each single-section pipe are provided with internal threads, and the gas injection pipes of two adjacent single-section pipes and the slip casting pipes are connected through the internal threads and the external threads.
The inner end air bag and the outer end air bag respectively comprise an elastic barrel, the elastic barrel is sleeved on the gas injection pipe, a row of gas filling holes along the longitudinal direction of the gas injection pipe are formed in the position of the sleeved gas injection pipe, and the two ends of the elastic barrel are fastened and pressed on the cylindrical metal ring through the fastening and pressing machine to be sealed and fixed on the gas injection pipe.
The outer diameter of the gas injection pipe part sleeved with the elastic cylinder is smaller than the outer diameters of the rest parts of the gas injection pipe, so that the part, sleeved with the elastic cylinder, of the gas injection pipe sleeved with the elastic cylinder is equivalent to the outer diameters of the rest parts of the gas injection pipe, the outer diameter of the whole assembled gas injection pipe is kept smooth, and the gas injection pipe is convenient to use in drilling.
The utility model has the advantages that: the utility model provides a secondary slip casting plugging device in drilling can carry out accurate area to the position of developing failure drilling crack and take the slip casting, the activation resumes gas drainage inefficacy drilling and takes out the function of taking out, improves gas drainage concentration and pure quantity, through the slip casting professional equipment with the thick liquid injection in the middle of the drilling that has the coal wall crack, along with the flow of thick liquid, can fill taking place crack (seam), the thick liquid can take place to solidify along with the lapse of time to compensate crack (seam), this effect that has just played the slip casting leaking stoppage, thereby improve gas drainage concentration, the utility model discloses not only can carry out the slip casting leaking stoppage, still have drilling gas leakage detection function concurrently. The utility model discloses technical advantage specifically includes: firstly, the whole section is recoverable, and the subsection can be adjusted, the utility model can be repeatedly used for many times in the actual use process, so the average utilization cost is lower, each part of the contained air bag, the air injection pipe and the grouting pipe can be replaced and adjusted, and the service life of the whole body can be prolonged; the depth and the length of the hole sealing section can be adjusted, all parts of the utility model are mutually independent, the length and the depth of the hole sealing section can be determined according to the needs of specific conditions in the actual use process, and the depth and the length of the hole sealing section can be adjusted mainly through the whole length of the control device and the length of the grouting pipe with the grouting hole; injecting hole sealing materials under pressure, and firmly drilling a gas extraction hole; the device inflates the air bags in the using process, the two air bags form a closed space in a drilling crack area, pressurized grouting is adopted in the grouting process, the grout can be ensured to better flow into and fill into the crack in a pressurized state, and the grouting effect is ensured. The utility model discloses combine "two stifled one notes" principles, the advantage part of hole packer hole sealing and capsule hole sealing has been assembled to the capsule material of the high resilience of high strength is as the end cap, and light metal material makes into sealed effectual, length-adjustable, the durable device of convenient operation as the main part, and the cost is also lower relatively.
Drawings
FIG. 1 is a schematic view of a borehole leak;
FIG. 2 is a schematic diagram of the drilling hole leakage detection of the present invention;
fig. 3 is a schematic view of the structure of the device of the present invention.
Description of reference numerals: 1. a gas extraction pipe; 2. a gas injection pipe; 3. a grouting pipe; 4. a seal body; 5. drilling a crack; 6. an air bag; 6-1, an inner air bag; 6-2 and an outer end air bag.
Detailed Description
In the following, an embodiment of the present invention will be described in detail with reference to the drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.
Referring to fig. 1-3, an embodiment of the present invention provides a secondary grouting plugging device in a borehole, including multiple single-section pipes, each single-section pipe includes a gas injection pipe 2 and a grouting pipe 3, the grouting pipe 3 is sleeved inside the gas injection pipe 2, a gap between the two pipes is used as a ventilation channel, a connecting member is fixed between the gas injection pipe 2 and the grouting pipe 3, and a relative position between the two pipes is fixed through the connecting member; the multiple single-section pipes are sequentially connected end to form the injection pipe, wherein the injection pipes 3 of two adjacent single-section pipes are connected, and the gas injection pipes 2 of two adjacent single-section pipes are connected; the injection pipe is inserted from the gas extraction pipe 1 when grouting and plugging are carried out on a drilled hole, wherein the inner ends of the connected gas injection pipes 2 extend out of the inner end of the gas extraction pipe 1 and cross a crack area of the drilled hole, and are connected and communicated with an inner end airbag 6-1, the inner end airbag 6-1 is used for sealing a drilled hole part where the inner ends of the gas injection pipes 2 are located after the gas injection pipes 2 are inflated, the positions, located at the inner ends of the gas extraction pipes 1, of the connected gas injection pipes 2 are connected and communicated with an outer end airbag 6-2, and the outer end airbag 6-2 is used for sealing an annular space between the gas injection pipes 2 and the gas extraction pipes 1 after the gas injection pipes 2 are inflated; a sealing body 4 for sealing an annular space gap between the drill hole and the gas extraction pipe 1 is also arranged at one end of the gas extraction pipe 1 and the inlet of the drill hole; many gas injection pipes 2 of filling tube are located drilling entry one end and are connected with gas supply equipment, and many slip casting pipes 3 of filling tube are located drilling entry one end and are connected with slip casting equipment.
Further, the gas injection pipe 2 and the slip casting pipe 3 of each single-section pipe are concentric reducing pipes which are sleeved together, a connecting piece between the two pipes is an annular metal plug, two ends of each single-section pipe are provided with metal plugs, an inner thread is arranged on the annular inner side wall of each metal plug, an outer thread matched with the inner thread is arranged on the outer side wall of the slip casting pipe 3, the annular space of the gas injection pipe 2 and the slip casting pipe 3, which is located at the metal plugs, is sealed by the metal plugs through the threaded connection of the inner thread and the outer thread, and air holes are formed in the end faces of the metal plugs.
Furthermore, the inner ends of the plurality of gas injection pipes 2 are provided with connecting joints, each connecting joint comprises two ports, one port is connected with the inner end airbag 6-1, and the other port is connected with the slurry output ends of the plurality of slurry injection pipes 3 and used for outputting slurry by the slurry injection pipes 3.
Further, the gas injection pipe 2 and the slip casting pipe 3 of the one end of each single section pipe all are equipped with the external screw thread, and the gas injection pipe 2 and the slip casting pipe 3 of the other end of each single section pipe all are equipped with the internal thread, all through inside and outside screw thread spiro union between the gas injection pipe 2 of two adjacent single section pipes and between the slip casting pipe 3.
Further, the inner end airbag 6-1 and the outer end airbag 6-2 both include an elastic cylinder, the elastic cylinder is sleeved on the gas injection pipe 2, a row of inflation holes along the longitudinal direction of the gas injection pipe 2 are formed in the sleeved gas injection pipe 2, and both ends of the elastic cylinder are fastened and pressed by a fastening and pressing machine to form a cylindrical metal ring which is hermetically fixed on the gas injection pipe 2.
Further, the outer diameter of the part of the gas injection pipe 2 sleeved with the elastic cylinder is smaller than the outer diameters of the rest parts of the gas injection pipe 2, so that the part of the gas injection pipe 2 sleeved with the elastic cylinder is equivalent to the outer diameters of the rest parts, the outer diameter of the whole assembled gas injection pipe 2 is ensured to be smooth, and the use in drilling is facilitated.
The utility model discloses in the middle of the device uses through slip casting professional equipment with the drilling that the thick liquid pours into the thick liquid has the coal wall crack, along with the flow of thick liquid, can fill taking place crack (seam), the thick liquid can take place to solidify along with the lapse of time to remedy crack (seam), this effect that has just played the slip casting leaking stoppage, thereby improve gas drainage concentration, the utility model discloses not only can realize the slip casting leaking stoppage, still have drilling gas leakage detection function concurrently. As shown in figure 2, the device is placed in a drill hole, after the device penetrates through a hole sealing section 16m extraction pipe, the gas extraction concentration at the depth of a 16-20 m region in the hole is detected step by step through an inner pipe (the gas extraction concentration is connected with the extraction pipe through a hole tee joint to keep the extraction state of the drill hole), a specific gas leakage region of the drill hole is obtained, and therefore the specific position and the length of the drill hole needing to be sealed are determined. As shown in fig. 3, the inner air bag of the device is inserted into a proper position in the hole, so that a detected air leakage area is positioned between two cloth bags, the air bag is inflated by injecting air into the air bag, the end part of the gas extraction pipe is blocked by the outer air bag, the drill hole is blocked by the inner air bag, two air bags and the coal wall between the two air bags form a blocking area, pressurized grouting is performed on the blocking area, and slurry is squeezed into the cracks of the coal wall of the drill hole after filling the blocking area, so that the air leakage area is blocked.
The secondary grouting device in the hole mainly comprises 4 parts, namely a bag short joint, a hole sealing section grouting short joint, a grouting connecting pipe and an orifice tee joint device. In order to realize independent inflation and grouting of the bag and the grouting section, the device adopts an inner pipe and outer pipe concentric structure, wherein the outer diameter of the outer pipe is 45mm, the wall thickness is 3.5mm, and the inner diameter is 38 mm; the outer diameter of the inner pipe is 28mm, the wall thickness is 7mm, the inner diameter is 14mm, the size of the pipe has good capability of penetrating and sealing the hole pipe, and the requirements of inflation of the outer pipe and grouting of the inner pipe can be met. In addition, the two ends of the pipe are connected by threads, and an O-shaped sealing ring is additionally arranged, so that the air tightness of the device is ensured.
The first generation of test devices are made of aluminum alloy materials, although the first generation of test devices have the advantages of light weight and convenience for manual pushing, the first generation of test devices also have the defects that joints are easy to deform and easily fall off, and a plurality of test pipe joints are deformed and damaged in the process of underground test; in addition, the capsule manufacturing process is an outward protruding rod body, the head of the extraction pipe is easily clamped in the process of stretching in the hole, so that the device is improved, a second generation test device is developed, the material of the rod body is mainly improved, the stainless steel material is adopted, although the weight of the second generation test device is doubled compared with that of the aluminum material, the device is firmer and more durable, the device can be smoothly pushed into the hole manually, and the damage phenomenon is avoided in the test process; secondly, the threaded connection process is improved, the large-pitch coarse threads are used, manual disassembly and assembly are facilitated, the inner pipe is used by an outer groove O-shaped ring side wall sealing process, and a sealing ring is not prone to falling and damage; finally, the capsule manufacturing process is improved, the outer diameter of the rod body at the capsule part is made thin, so that the outer diameter of the air bag after compression joint is consistent with that of other rod bodies of the device, and the phenomenon of 'mutation' of the first generation device is eliminated.
The grouting pump that this embodiment chose for use is the hole sealing pump of grouting in the pit, and used hole sealing pump is the commonly used SZKF-3.0QB type grouting hole sealing pump, and maximum output pressure is 3.2MPa, through the experiment in the pit, the grouting pump can be smoothly with the thick liquid pour into downthehole and in the pore wall crack, and most drilling still can continue the slip casting after the slip casting volume has surpassed the expected slip casting volume, and the grouting pump is pressureless, so this grouting pump can satisfy secondary hole sealing slip casting pressure requirement. The grouting pump parameters are shown in table 1.
TABLE 1 slip casting pump main performance parameter table
| Product type | SZKF-3.0QB | Grouting pump weight | 16kg |
| Working air pressure | 0.3～0.7MPa | Size of the barrel | Φ500×1350 |
| Maximum output pressure | 3.2MPa | Maximum measuring range | 0～30m |
| Maximum output flow | 20L/min | Vent tube diameter 3/4 | 3/4 |
| Gas consumption | ≤0.28m3/min | Number of reciprocations | Less than or equal to 150 times/min |
Because the utility model discloses the core of technique is that the gas leakage crack to around the drilling pore wall carries out the slip casting shutoff, and this is exactly required the concrete fine mobility of slip casting liquid, guarantees simultaneously that the thick liquid has certain expansibility, does not shrink after solidifying in the crack. In addition, because grouting equipment needs to be recycled, the initial setting time of grout in a hole sealing section cannot be too fast (needs to be longer than the hole sealing grouting time), and the initial setting must be carried out after the hole sealing grouting device releases pressure and exits from a drilled hole, so that the device cannot exit from the drilled hole, and the reutilization function of the device is further realized.
The cement for sealing the hole under the mine adopts KFGP-III type gas hole sealing special material produced by Suzhou Kunfa company, the material is micro-expansion cement, the expansion coefficient is 1.203, the initial setting time is 40min (slurry completely loses fluidity), the slurry water cement ratio is controlled to be 1.2: 1-1.6: 1 through laboratory tests, the slurry fluidity and the setting performance are good, the water cement ratio is basically 1.2:1 during field tests, the slurry fluidity and the setting performance are good during grouting, pipe blocking and slurry non-feeding are not caused, the device can be smoothly withdrawn after the slurry is injected, and the drill sticking phenomenon caused by the fact that the slurry is too quickly set is not caused. Therefore, the hole sealing material and the slurry can meet the requirement of secondary grouting.
The utility model discloses will the concrete theory of operation of device will the utility model discloses the device is put into gas inefficacy drilling, and inside gasbag 6-1 and outer end gasbag 6-2 carry out the shutoff with the both ends in crack region, make this region form airtight space after 6 inflation of gasbag, take the area to press the slip casting to this region and make the thick liquid can be abundant fill in the crack in the middle of, resume inefficacy drilling function, improve gas drainage effect.
The working steps are as follows: the working process of the device mainly comprises two parts, namely, detecting the air leakage part of the failed drill hole; and secondly, performing accurate grouting according to the detection result. The steps for detecting the air leakage position of the failed drill hole are as follows: stopping drilling and pulling the drill hole, putting the device into the drill hole to be detected in sections, wherein the placing sequence is as follows: an outer end air bag, a grouting pipe with a grouting hole, an inner end air bag and a common grouting pipe; and placing grouting pipes with grouting holes at positions with drilling depths of 16m, 17m, 18m and 19m respectively, recovering the drilling pumping state for 5-10 minutes, closing the devices, installing a specially-made sharp-nose object at the outer end of the device to be connected with a pumping cylinder for pumping, sending the pumped gas into an optical tile detector for gas concentration detection, and recording and analyzing detection data. According to the data condition, if the gas concentration reduction range in a certain interval is maximum, the gas leakage position of the drill hole is determined.
And (3) performing accurate grouting on the failed drill hole: and closing the drainage state of the drill hole, putting the device into the drill hole in sections, putting the outer-end air bag 6 into the drill hole, putting the grouting pipe with the grouting hole to the detected gas leakage part, putting the inner-end air bag 6 into the gas drainage pipe, and connecting the common grouting pipe in turn. Connecting an underground compressed air pipe with an air channel designed at the front end of the device, opening a control switch to inflate the air bag 6, closing an inflation valve to stop inflating when the inflation pressure reaches 0.35-0.4 MPa (the diameter of the inner section of the air bag can be expanded to 130mm), and observing whether the reading of a pressure gauge is stable or not, wherein if the reading is stable, the device can be subjected to next test operation; if the reading of the pressure gauge slowly drops, the system is indicated to have slight air leakage, the inflation valve is kept in an open state at the moment, and the size of the valve switch is adjusted, so that the reading of the pressure gauge is stabilized at 0.4 MPa; if the reading of the pressure gauge rapidly drops after the inflation valve is closed, the serious air leakage phenomenon of the system is indicated, and the withdrawing device is pushed into the hole after the air tightness is rechecked. Connecting a grouting pump compressed air pipeline, adding clear water into the grouting pump, adding hole sealing cement while stirring, and mixing according to the weight ratio of 1: 1-1.2: 1, preparing grouting liquid according to the water-cement ratio; after the slurry is fully and uniformly stirred, the device of the utility model is connected with a slurry outlet (a slurry outlet of a grouting device) of a grouting pump through a high-pressure grouting pipe, a valve is opened to start grouting, the change of grouting pressure in a hole is observed through a grouting pressure gauge on the device in the grouting process, when the grouting pressure rises to 0.5MPa, the grouting frequency of the grouting pump is properly reduced, and grouting is slowly pressurized in the hole until the grouting pressure rises to 1MPa or the grouting pump is stopped; after grouting, closing a valve of the grouting pipe, maintaining the pressure for 2 minutes and then releasing the pressure; opening an air bag inflation valve of the device to release pressure of the air bag, and injecting clear water into the hole through a device grouting pipe by using a grouting pump after the pressure is released to dilute the slurry of the hole sealing section (about 2 min); the whole device in the exit hole is used for cleaning the grouting pump and cleaning the inner part and the outer part of the device.
To sum up, the utility model provides a secondary slip casting plugging device in drilling can develop the position to inefficacy drilling crack and carry out accurate slip casting of taking pressure, the activation resumes gas drainage inefficacy drilling and takes out the function of taking out, improve gas drainage concentration and pure quantity, through the slip casting professional equipment with the thick liquid injection in the middle of the drilling that has the coal wall crack, along with the flow of thick liquid, can fill taking place crack (seam), the thick liquid can take place to solidify along with the lapse of time to compensate crack (seam), this effect that has just played the slip casting leaking stoppage, thereby improve gas drainage concentration, the utility model discloses not only can carry out the slip casting leaking stoppage, still have drilling gas leakage detection function concurrently. The utility model discloses technical advantage specifically includes: firstly, the whole section is recoverable, and the subsection can be adjusted, the utility model can be repeatedly used for many times in the actual use process, so the average utilization cost is lower, each part of the contained air bag, the air injection pipe and the grouting pipe can be replaced and adjusted, and the service life of the whole body can be prolonged; the depth and the length of the hole sealing section can be adjusted, all parts of the utility model are mutually independent, the length and the depth of the hole sealing section can be determined according to the needs of specific conditions in the actual use process, and the depth and the length of the hole sealing section can be adjusted mainly through the whole length of the control device and the length of the grouting pipe with the grouting hole; injecting hole sealing materials under pressure, and firmly drilling a gas extraction hole; the device inflates the air bags in the using process, the two air bags form a closed space in the area of the fracture 5 of the drilled hole, pressurized grouting is adopted in the grouting process, the grout can be ensured to better flow into and fill into the fracture in a pressurized state, and the grouting effect is ensured. The utility model discloses combine "two stifled one notes" principles, the advantage part of hole packer hole sealing and capsule hole sealing has been assembled to the capsule material of the high resilience of high strength is as the end cap, and light metal material makes into sealed effectual, length-adjustable, the durable device of convenient operation as the main part, and the cost is also lower relatively.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
Claims (6)
1. The secondary grouting leakage blocking device in the drill hole is characterized by comprising a plurality of single-section pipes, wherein each single-section pipe comprises a gas injection pipe (2) and a grouting pipe (3), the grouting pipe (3) is sleeved inside the gas injection pipe (2), a gap between the two pipes is used as a ventilation channel, and the gas injection pipe (2) and the grouting pipe (3) are fixed at the relative positions of the two pipes through a connecting piece; the multiple single-section pipes are sequentially connected end to form the injection pipe, wherein the injection pipes (3) of two adjacent single-section pipes are connected, and the gas injection pipes (2) of two adjacent single-section pipes are connected; the injection pipe is inserted from the gas extraction pipe (1) when secondary grouting plugging is carried out on a drilled hole, wherein the inner ends of the connected gas injection pipes (2) extend out of the inner ends of the gas extraction pipe (1) and cross a crack area of the drilled hole, and are connected and communicated with an inner end airbag (6-1), the inner end airbag (6-1) is used for sealing a drilled hole part of the inner ends of the gas injection pipes (2) after the gas injection pipes (2) are inflated, the positions, located at the inner ends of the gas extraction pipes (1), of the connected gas injection pipes (2) are connected and communicated with an outer end airbag (6-2), and the outer end airbag (6-2) is used for sealing an annular space gap between the gas injection pipes (2) and the gas extraction pipe (1) after the gas injection pipes (2) are inflated; a sealing body (4) used for sealing an annular space gap between the drill hole and the gas extraction pipe (1) is further arranged at one end of the gas extraction pipe (1) and the inlet of the drill hole; many gas injection pipes (2) of injection pipe are located drilling entry one end and are connected with gas supply equipment, and many slip casting pipes (3) of injection pipe are located drilling entry one end and are connected with slip casting equipment.
2. The secondary grouting leakage stoppage device in the drill hole according to claim 1, wherein the gas injection pipe (2) and the grouting pipe (3) of each single-section pipe are concentric reducer pipes sleeved together, the connecting piece between the two pipes is an annular metal plug, a metal plug is arranged at each of two ends of each single-section pipe, wherein an inner thread is arranged on the annular inner side wall of the metal plug, an outer thread matched with the inner thread is arranged on the outer side wall of the grouting pipe (3), the metal plug seals the annular space gap of the gas injection pipe (2) and the grouting pipe (3) at the metal plug through the threaded connection of the inner thread and the outer thread, and a vent hole is formed in the end surface of the metal plug.
3. The secondary grouting leakage stoppage device in the drill hole according to claim 1, wherein the inner ends of the plurality of gas injection pipes (2) are provided with connecting joints, the connecting joints comprise two ports, one port is connected with the inner end air bag (6-1), and the other port is connected with the grout output ends of the plurality of grouting pipes (3) and is used for outputting grout from the grouting pipes (3).
4. The secondary grouting leakage stoppage device in the drill hole according to claim 1, wherein the gas injection pipe (2) and the grouting pipe (3) at one end of each single-section pipe are provided with external threads, the gas injection pipe (2) and the grouting pipe (3) at the other end of each single-section pipe are provided with internal threads, and the gas injection pipes (2) and the grouting pipes (3) of two adjacent single-section pipes are in threaded connection through the internal threads and the external threads.
5. The secondary grouting leak stoppage device in the drill hole according to claim 1, wherein the inner end air bag (6-1) and the outer end air bag (6-2) each comprise an elastic cylinder, the elastic cylinder is sleeved on the gas injection pipe (2), a row of inflation holes along the longitudinal direction of the gas injection pipe (2) are formed at the position of the sleeved gas injection pipe (2), and both ends of the elastic cylinder are fastened and pressed by a fastening and pressing machine to form a cylindrical metal ring to be sealed and fixed on the gas injection pipe (2).
6. The secondary grouting leakage stoppage device in the drill hole according to claim 5, wherein the outer diameter of the portion of the gas injection pipe (2) sleeved with the elastic cylinder is smaller than the outer diameters of the rest portions of the gas injection pipe (2), so that the portion of the gas injection pipe (2) sleeved with the elastic cylinder is equivalent to the outer diameters of the rest portions, thereby ensuring that the outer diameter of each gas injection pipe (2) is kept smooth after being assembled and facilitating the use in the drill hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020670162.7U CN212154846U (en) | 2020-04-27 | 2020-04-27 | Secondary grouting plugging device in drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020670162.7U CN212154846U (en) | 2020-04-27 | 2020-04-27 | Secondary grouting plugging device in drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212154846U true CN212154846U (en) | 2020-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703299A (en) * | 2024-02-06 | 2024-03-15 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703299A (en) * | 2024-02-06 | 2024-03-15 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
| CN117703299B (en) * | 2024-02-06 | 2024-05-14 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201215 Termination date: 20210427 |