A grouting device for mines suitable for soft strata

Abstract

The present invention discloses a grouting device for mines suitable for soft formations, comprising a grouting pipe, a plurality of grouting nozzles slidably connected to the pipe wall of the grouting pipe and capable of sliding and retracting along the radial direction, and a plurality of swinging anchor claws pivotally connected to the pipe wall and capable of being supported by the grouting nozzles. The grouting nozzles and the swinging anchor claws are retracted in normal conditions, and are respectively extended and swung out during grouting, thereby reducing the impact on the hole wall of the grouting borehole in the soft formation, reducing the defect of a large number of cracks around the grouting borehole in the soft formation, and effectively avoiding the occurrence of collapse of the soft formation around the grouting borehole due to leakage of the anchor claws. The extension of the grouting nozzles is entirely dependent on the impact force or buoyancy provided by the slurry, and the swinging of the swinging anchor claws is entirely dependent on the driving effect of the grouting nozzles, without the need for additional power.

Description

Technical Field

[0001] The invention relates to the technical field of underground grouting to construct an isolation layer, and in particular to a grouting device for a mine suitable for soft strata. Background Art

[0002] In the development areas in northwest my country, the strata are complex, including Gobi, desert, permafrost zone, and weathering layer. During the underground construction of coal mines, sandy soil layers and aquifers are also passed. Underground, if water seepage occurs, it is necessary to build an isolation layer by grouting to play a role in water conservation and anti-seepage. If water storage areas and underground reservoirs are built in deserts and Gobi, it is also necessary to build an isolation layer by grouting below the surface or underground to play a role in water conservation and water storage.

[0003] Existing grouting pipes are mostly suitable for hard formations, such as rock formations, hardened layers, surrounding rocks, etc. For example, the Chinese invention patent with publication number CN118087496A discloses a continuous partition grouting and anchoring integrated device and process for following pipe drilling, wherein an anchor claw is provided on the outer peripheral surface of the steel pipe, the anchor claw is in an arc shape and is fixed to the outer wall surface of the seamless steel pipe by hinge welding, and has the dual functions of hole expansion and anchoring. The Chinese utility model patent with announcement number CN214330622U discloses a grouting pipe for grouting surrounding rocks of tunnels, wherein an anchoring structure is provided on the pipe wall of the grouting pipe, and the anchoring structure includes an anchor claw, one end of the anchor claw is connected to the orifice pipe, and the extension direction of the other end forms an obtuse angle with the grouting direction in the grouting pipe, and the anchor claw forms mechanical friction with the hole wall of the grouting hole, so that the grouting pipe can only move forward in the grouting hole, but cannot move backward.

[0004] The anchor claw configuration of the grouting pipe in the above patent cannot be applied to soft formations, such as weathered rock formations, sandy soil layers, silt layers, clay layers, sand layers, mudstone layers, and non-silicified limestone layers. This is because the anchor claws of the grouting pipe in the above patent are kept on the outside of the pipe wall and are used for hole expansion or for friction anchoring with the borehole wall, which will cause the hole wall of the grouting hole in the soft formation to be damaged, the grouting hole will have irregular ruptures, and the soft formation will partially collapse around the grouting hole, increasing the difficulty of grouting to form an isolation layer.

[0005] In view of this, it is necessary to provide a grouting device for mines suitable for soft formations. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a grouting device for mines suitable for soft strata.

[0007] The technical solution of the present invention provides a grouting device for a mine suitable for soft formations, comprising a grouting pipe, a plurality of grouting nozzles slidably connected to the pipe wall of the grouting pipe and capable of sliding and retracting along the radial direction, and a plurality of swinging anchor claws pivotally connected to the pipe wall and capable of being supported by the grouting nozzles;

[0008] The liquid inlet end of the grouting nozzle is located in the grouting flow channel of the grouting pipe, the nozzle body of the grouting nozzle slides through the radial through hole of the pipe wall, and the liquid outlet end of the grouting nozzle faces the swinging anchor claw;

[0009] An anchor claw receiving groove is provided on the outer peripheral surface of the pipe wall corresponding to the position of each grouting nozzle, and the tail end of the anchor claw of the swinging anchor claw can be pivotally installed in the anchor claw receiving groove; the anchor claw body of the swinging anchor claw is provided with an anchor claw through hole for the liquid outlet end of the nozzle to pass through, and a detachable plug cover is provided in the anchor claw through hole;

[0010] When the grouting pipe is in the grouting state, the grouting nozzle is in the extended state, and the liquid outlet end of the nozzle can break through the detachable plugging cover and extend the grouting from the anchor claw through hole, while driving the swinging anchor claw to swing outward, and the anchor claw head end of the swinging anchor claw swings out of the anchor claw receiving groove to be inserted into the surrounding soft formation.

[0011] In one of the optional technical solutions, a support ring is provided on the nozzle body, and the radius of the support ring is larger than the radius of the anchor claw through hole;

[0012] A step portion is provided in the radial through hole;

[0013] When the grouting nozzle is in an initial state, the support ring falls on the step portion;

[0014] When the grouting nozzle is extended into place, the supporting ring supports the swinging anchor claw.

[0015] In one of the optional technical solutions, a bottom groove is provided at the bottom of the hole wall of the anchor claw through hole close to the tail end side of the anchor claw;

[0016] The side surface of the support ring facing the tail end of the fluke is provided with a first tooth portion;

[0017] When the grouting nozzle is extended into place, the portion of the support ring having the first tooth portion enters the bottom groove, and the bottom angle of the bottom groove engages with the first tooth portion.

[0018] In one of the optional technical solutions, the liquid outlet end of the nozzle has a liquid outlet conical surface, and the radius of the liquid outlet conical surface gradually decreases along the radial direction of the grouting pipe;

[0019] When the grouting nozzle is extended to the right position, the hole wall of the anchor claw through hole away from the tail end of the anchor claw is in a fitting state with the conical surface of the liquid outlet end.

[0020] In one of the optional technical solutions, the conical surface of the liquid outlet end is provided with a second tooth portion, and the hole wall of the anchor claw through hole away from the tail end of the anchor claw is provided with a third tooth portion;

[0021] When the grouting nozzle is extended into place, the third tooth portion is engaged with the second tooth portion.

[0022] In one of the optional technical solutions, a telescopic pin is provided on the nozzle body;

[0023] One end of the radial through hole connected to the grouting channel is provided with a bell mouth for guiding the telescopic pin to pass through;

[0024] When the grouting nozzle is extended to the right position, the telescopic pin falls on the step portion.

[0025] In one of the optional technical solutions, the liquid inlet end of the nozzle has a liquid inlet end conical surface, and the radius of the liquid inlet end conical surface gradually increases along the direction from the liquid inlet end of the nozzle to the liquid outlet end of the nozzle.

[0026] In one of the optional technical solutions, a conical elastic flow guide cover is connected between the liquid inlet end of the nozzle and the inner surface of the tube wall;

[0027] In the direction from the liquid inlet end of the nozzle to the liquid outlet end of the nozzle, the radius of the conical surface of the liquid inlet end gradually increases.

[0028] In one of the optional technical solutions, the groove wall of the fluke receiving groove is provided with an elastic sheet;

[0029] When the swing fluke is received in the fluke receiving groove, the elastic sheet presses the fluke head end.

[0030] In one of the optional technical solutions, the outer surface of the swinging fluke is a curved surface adapted to the outer surface of the tube wall, and the fluke head end has a pointed end.

[0031] The above technical solution has the following beneficial effects:

[0032] The present invention provides a grouting device for mines suitable for soft formations. Under normal circumstances, the grouting nozzle will not extend out of the outside of the grouting pipe, and the swinging anchor claw will not protrude in the anchor claw receiving groove of the pipe wall, thereby not affecting the smooth passage of the grouting pipe in the grouting borehole, nor causing the grouting borehole to expand or cause the soft formation around the grouting borehole to collapse, which is conducive to the subsequent grouting to form an isolation layer in the soft formation.

[0033] When grouting into the grouting pipe, under the action of slurry, the grouting nozzle slides radially outward, pushes open the detachable plugging cover and extends from the anchor claw through hole to grouting. When the grouting nozzle extends, it will lift the swinging anchor claw, so that the swinging anchor claw swings to a certain angle, and the head end of the anchor claw swings to the outside of the anchor claw receiving groove to be inserted into the surrounding soft formation to play an anchoring role.

[0034] In summary, the present invention provides a grouting device for mines suitable for soft formations, wherein the grouting nozzle and the swinging anchor claw are retracted in normal conditions, and are extended and swung out respectively during grouting, thereby reducing the impact on the hole wall of the grouting borehole in the soft formation, reducing the defect of a large number of cracks around the grouting borehole in the soft formation, and effectively avoiding the occurrence of collapse of the soft formation around the grouting borehole due to the leakage of the anchor claw. The extension of the grouting nozzle depends entirely on the impact force or buoyancy provided by the slurry, and the swinging out of the swinging anchor claw depends entirely on the driving effect of the grouting nozzle, without the need for additional power. The liquid inlet end of the grouting nozzle is in the grouting flow channel of the grouting pipe, which is conducive to directly bearing the impact force or buoyancy of the slurry, and there is no need to leave installation and sliding space for the liquid inlet end of the nozzle on the pipe wall, which is conducive to reducing the wall thickness of the pipe wall, simplifying the structure of the pipe wall, and facilitating processing and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0036] Figure 1 A cross-sectional view of a grouting device for a mine provided by an embodiment of the present invention, wherein the grouting nozzle and the swinging anchor claw are in an initial state;

[0037] Figure 2 for Figure 1 A cross-sectional view of a grouting device for a mine is shown, wherein the grouting nozzle is in an extended state and the swinging anchor claw is in a swung-out state;

[0038] Figure 3 It is an enlarged schematic diagram of the connection between the grouting nozzle and the swing anchor claw and the grouting pipe;

[0039] Figure 4 It is a cross-sectional view of a grouting nozzle;

[0040] Figure 5 A schematic diagram showing that the conical surface of the liquid outlet end is provided with a second tooth portion;

[0041] Figure 6 It is a schematic diagram of a nozzle body provided with a telescopic pin;

[0042] Figure 7 A schematic diagram of a grouting pipe wall provided with radial through holes and anchor claw receiving grooves;

[0043] Figure 8 is a cross-sectional view of a swinging anchor claw;

[0044] Fig. 9 A schematic diagram of a detachable plugging cover provided in the anchor claw through hole;

[0045] Fig.10 A three-dimensional diagram of a swinging anchor claw;

[0046] Fig.11 It is a schematic diagram of the force on the liquid inlet end of the nozzle when grouting into the grouting pipe;

[0047] Fig.12 It is a schematic diagram showing that when the grouting nozzle slides out, the liquid outlet end of the nozzle breaks through the detachable plugging cover and extends out from the anchor claw through hole;

[0048] Fig.13 This is a schematic diagram of the grouting nozzle being extended into place;

[0049] Fig.14 It is a schematic diagram of the telescopic pin falling on the step portion when the grouting nozzle is extended to the full position;

[0050] Fig.15 It is a schematic diagram showing that when the grouting nozzle is extended to the right position, the bottom corner of the bottom groove is engaged with the first tooth portion, and the third tooth portion is engaged with the second tooth portion;

[0051] Fig.16 A schematic diagram of a mine grouting device being arranged in a grouting borehole in a soft stratum;

[0052] Fig.17 It is a schematic diagram that after grouting into the grouting pipe, the liquid outlet end of the grouting nozzle extends out of the outside of the pipe wall from the anchor claw through hole and sprays grout, and the anchor claw head end of the swinging anchor claw swings to the outside of the anchor claw receiving groove to be inserted into the surrounding soft formation. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0054] like Figure 1-4 , Figure 7-8 , Figure 11-13 and Figure 16-17As shown, an embodiment of the present invention provides a grouting device for use in mines suitable for soft formations, comprising a grouting pipe 1, a plurality of grouting nozzles 2 slidably connected to a pipe wall 10 of the grouting pipe 1 and capable of sliding and retracting radially, and a plurality of swinging anchor claws 3 pivotally connected to the pipe wall 10 and capable of being supported by the grouting nozzles 2.

[0055] The liquid inlet end 21 of the grouting nozzle 2 is in the grouting flow channel 11 of the grouting pipe 1 , the nozzle body 22 of the grouting nozzle 2 slides through the radial through hole 12 of the pipe wall 10 , and the liquid outlet end 23 of the grouting nozzle 2 faces the swinging anchor claw 3 .

[0056] An anchor accommodating groove 13 is provided on the outer circumferential surface of the pipe wall 10 corresponding to the position of each grouting nozzle 2, and the anchor tail end 31 of the swing anchor 3 is pivotally installed in the anchor accommodating groove 13. The anchor body of the swing anchor 3 is provided with an anchor through hole 33 for the nozzle outlet end 23 to pass through, and a detachable plug cover 34 is provided in the anchor through hole 33.

[0057] When the grouting pipe 1 is in the grouting state, the grouting nozzle 2 is in the extended state, and the liquid outlet end 23 of the nozzle can break the detachable plugging cover 34 and extend the grouting from the anchor claw through hole 33, while driving the swinging anchor claw 3 to swing outward, and the anchor claw head end 32 of the swinging anchor claw 3 swings out of the anchor claw receiving groove 13 to be inserted into the surrounding soft formation.

[0058] The invention provides a grouting device for mines suitable for grouting in soft strata to construct isolation layers. The soft strata are generally weathered rock strata, sandy soil strata, silt strata, clay strata, sand strata, mudstone strata and non-silicified limestone strata.

[0059] During construction, a grouting borehole is first drilled in the soft stratum, and then the mine grouting device is laid in the grouting borehole. Alternatively, the grouting borehole can be drilled and the mine grouting device can be laid at the same time.

[0060] The grouting device for a mine comprises a grouting pipe 1, a plurality of grouting nozzles 2 and a plurality of swinging anchor claws 3. The grouting nozzles 2 are slidably connected to the pipe wall 10 of the grouting pipe 1 and can slide and retract along the radial direction. The swinging anchor claws 3 are pivotally connected to the pipe wall 10 and can be supported and swung by the grouting nozzles 2.

[0061] A plurality of radial through holes 12 are provided at intervals along the axial direction on the pipe wall 10 of the grouting pipe 1, and a plurality of radial through holes 12 are provided at intervals along the circumferential direction on the pipe wall 10. Preferably, a plurality of circles of radial through holes 12 are provided at intervals along the axial direction on the pipe wall 10, and each circle of radial through holes 12 includes a plurality of radial through holes 12. The central hole of the grouting pipe 1 is a grouting flow channel 11, and the inner end opening of the radial through hole 12 is connected to the grouting flow channel 11.

[0062] A fluke receiving groove 13 is provided on the outer circumferential surface of the tube wall 10 at a position corresponding to each radial through hole 12 , and the outer end opening of the radial through hole 12 is located at the bottom of the fluke receiving groove 13 .

[0063] The plurality of grouting nozzles 2 are configured one-to-one with the plurality of radial through holes 12, and each grouting nozzle 2 passes through one radial through hole 12. The plurality of swinging flukes 3 are configured one-to-one with the plurality of fluke receiving grooves 13, and each swinging fluke 3 is assembled in one fluke receiving groove 13.

[0064] In normal state, the grouting nozzle 2 is in a retracted state, and the swinging anchor claw 3 is accommodated in the anchor claw receiving groove 13, which will not affect the advancement or laying of the grouting pipe 1 in the grouting borehole, nor will it affect the hole wall of the grouting borehole.

[0065] The grouting nozzle 2 includes a nozzle liquid inlet end 21, a nozzle body 22 and a nozzle liquid outlet end 23 which are integrally connected. The grouting flow channel 20 of the grouting nozzle 2 passes through the nozzle liquid inlet end 21, the nozzle body 22 and the nozzle liquid outlet end 23. The nozzle liquid inlet end 21 is located in the grouting flow channel 11 of the grouting pipe 1, and the nozzle body 22 is a round tube, which passes through the radial through hole 12 of the pipe wall 10 and can slide along the radial through hole 12. The nozzle liquid outlet end 23 faces the swinging anchor claw 3.

[0066] When high-pressure slurry, such as microbial material slurry, cement slurry, etc., is injected into the grouting pipe 1, the impact force of the slurry acts or pushes the liquid inlet end 21 of the nozzle, causing the grouting nozzle 2 to extend outward along the radial through hole 12, and at the same time, the slurry will be sprayed out from the liquid outlet end 23 of the nozzle through the spraying channel 20.

[0067] In order to prevent the grouting nozzle 2 from completely falling into the grouting channel 11 , a limiting structure, such as a stop boss, a limiting pin, etc., is provided between the nozzle body 22 and the hole wall of the radial through hole 12 .

[0068] When the grouting nozzle 2 is in the initial state, the limiting structure keeps the grouting nozzle 2 in the initial position, and a preset distance is left between the nozzle liquid outlet 23 and the swinging anchor claw 3 in the initial state.

[0069] In order to prevent the grouting nozzle 2 from detaching from the grouting pipe 1 when extending outward, the radius of the nozzle liquid inlet end 21 is set to be larger than the radius of the inner end opening of the radial through hole 12. When the nozzle liquid inlet end 21 touches the inner surface of the grouting flow channel 11, it means that the grouting nozzle 2 is extended to the right position. The distance that the grouting nozzle 2 can extend outward and slide is much larger than the preset distance between the nozzle liquid outlet end 23 and the swinging anchor claw 3 in the initial state, so as to ensure that the extension of the grouting nozzle 2 can drive the anchor claw head end 32 of the swinging anchor claw 3 to swing out of the anchor claw receiving groove 13.

[0070] The swinging fluke 3 comprises an integrally connected fluke tail end 31, a fluke body and a fluke head end 32. The fluke tail end 31 and the fluke body are respectively in the shape of a plate or a sheet, and the fluke head end 32 can be in the shape of a plate or a sheet, and its thickness gradually becomes thinner.

[0071] The fluke tail end 31 is installed in the fluke receiving slot 13 via a pivot shaft 311. Both ends of the pivot shaft 311 are connected to the two side slot walls of the fluke receiving slot 13.

[0072] The thickness of the swinging anchor claw 3 is less than or equal to the depth of the anchor claw receiving groove 13. In the axial direction along the grouting pipe 1, the length of the swinging anchor claw 3 is slightly less than the length of the anchor claw receiving groove 13.

[0073] Therefore, the swinging fluke 3 can be completely accommodated in the fluke receiving groove 13. A certain damping structure can be pre-configured between the pivot shaft 311 and the groove wall of the fluke receiving groove 13 to prevent the swinging fluke 3 from automatically swinging out. The damping structure can be selected from a torsion spring, an anti-slip washer, etc.

[0074] The fluke body is provided with a fluke through hole 33 . When the swing fluke 3 is received in the fluke receiving groove 13 , the radial through hole 12 is aligned with the fluke through hole 33 . The radius of the fluke through hole 33 is greater than the radius of the radial through hole 12 .

[0075] The anchor claw through hole 33 is used for the nozzle liquid outlet end 23 to pass through. Since the swinging anchor claw 3 is driven to swing, the radius of the anchor claw through hole 33 is set to be larger than the radius of the nozzle liquid outlet end 23, so that the nozzle liquid outlet end 23 can pass through the anchor claw through hole 33 and flow out of the space. Otherwise, the nozzle liquid outlet end 23 will contact the wall surface of the anchor claw through hole 33 too early, affecting the swinging angle of the swinging anchor claw 3 and also affecting the length of the nozzle liquid outlet end 23 that can extend relative to the anchor claw through hole 33.

[0076] The radius of the anchor claw through hole 33 and the radius of the nozzle liquid outlet end 23 can be set according to actual needs, and a reasonable ratio can be obtained through experiments. If the nozzle liquid outlet end 23 adopts a conical design, the radius of the anchor claw through hole 33 is mainly slightly larger than the maximum radius of the nozzle liquid outlet end 23 to meet the requirements.

[0077] A detachable plugging cover 34 is provided in the anchor claw through hole 33, and a weakened groove 341 is provided between the edge of the detachable plugging cover 34 and the hole wall of the anchor claw through hole 33 to achieve a weakened connection. The detachable plugging cover 34 can also be plugged into the anchor claw through hole 33, and the detachable plugging cover 34 is kept in the anchor claw through hole 33 only by friction.

[0078] When the grouting nozzle 2 is pushed out by the slurry, the nozzle liquid outlet end 23 touches the detachable plugging cover 34 and pushes the detachable plugging cover 34 open.

[0079] The detachable plugging cover 34 is used to prevent sand, mud and the like from entering the anchor claw receiving groove 13, the radial through hole 12 and the nozzle liquid outlet 23 to affect normal use. The detachable plugging cover 34 is used to receive the impact force from the nozzle liquid outlet 23 and transmit the impact force to the swinging anchor claw 3, so that the swinging anchor claw 3 swings to the outside of the anchor claw receiving groove 13.

[0080] Therefore, when the grouting pipe 1 is in the grouting state, the grouting nozzle 2 is in the extended state, and the nozzle liquid outlet end 23 can break the detachable plug cover 34 and extend from the anchor claw through hole 33 to grout the surrounding area. At the same time, the nozzle liquid outlet end 23 drives the swinging anchor claw 3 to swing outward, and the anchor claw head end 32 swings out to the outside of the anchor claw receiving groove 13 to be inserted into the surrounding soft formation. The slurry will penetrate into the soft formation to form an isolation layer. After the slurry solidifies to form an isolation layer, the nozzle liquid outlet end 23 and the anchor claw head end 32 are both fastened in the isolation layer, and the remaining slurry in the grouting pipe 1 will also form an isolation layer. The nozzle liquid outlet end 23 and the swinging anchor claw 3 can connect the isolation layers inside and outside the grouting pipe 1 together, so that the inner and outer isolation layers are connected, which is conducive to improving the integrity and stability of the isolation layer, and is also conducive to anchoring the outer isolation layer in the soft formation.

[0081] Based on the above, the present invention provides a grouting device for mines suitable for soft formations. Under normal circumstances, the grouting nozzle 2 will not extend out of the outside of the grouting pipe 1, and the swinging anchor claw 3 is received in the anchor claw receiving groove 13 of the pipe wall 10 and will not protrude, thereby not affecting the smooth passage of the grouting pipe 1 in the grouting borehole, nor causing the grouting borehole to expand or cause the soft formation around the grouting borehole to collapse, which is conducive to the subsequent grouting to form an isolation layer in the soft formation.

[0082] When grouting into the grouting pipe 1, under the action of the slurry, the grouting nozzle 2 slides radially outward, pushes open the detachable plugging cover 34 and extends from the anchor claw through hole 33 to perform grouting. When the grouting nozzle 2 extends, the swinging anchor claw 3 is lifted up, so that the swinging anchor claw 3 swings to a certain angle, and the anchor claw head end 32 swings to the outside of the anchor claw receiving groove 13 to be inserted into the surrounding soft formation to play an anchoring role.

[0083] During the grouting process, due to the push of the high-pressure slurry, the grouting nozzle 2 can be kept in the extended state, and the slurry will solidify quickly, thereby solidifying the nozzle liquid outlet 23 and the swinging anchor claw 3, so that the grouting nozzle 2 is kept in the open state, and the swinging anchor claw 3 is kept in the swinging state. Therefore, after the grouting is stopped, the grouting nozzle 2 is also kept in the open state, and the swinging anchor claw 3 is also kept in the swinging state.

[0084] In summary, the present invention provides a grouting device for mines suitable for soft formations, wherein the grouting nozzle 2 and the swinging anchor claw 3 are retracted in normal conditions, and are extended and swung out respectively during grouting, which reduces the impact on the hole wall of the grouting borehole in the soft formation, reduces the defect of a large number of cracks around the grouting borehole in the soft formation, and can also effectively avoid the occurrence of collapse of the soft formation around the grouting borehole due to the leakage of the anchor claw. The extension of the grouting nozzle 2 is entirely dependent on the impact force or buoyancy provided by the slurry, and the swinging of the swinging anchor claw 3 is entirely dependent on the driving effect of the grouting nozzle 2, without the need for additional power. The nozzle liquid inlet end 21 of the grouting nozzle 2 is located in the grouting flow channel 11 of the grouting pipe 1, which is conducive to directly bearing the impact force or buoyancy of the slurry, and there is no need to reserve installation and sliding space for the nozzle liquid inlet end 21 on the pipe wall 10, which is conducive to reducing the wall thickness of the pipe wall 10, simplifying the structure of the pipe wall 10, and facilitating processing and manufacturing.

[0085] In one embodiment, if Figure 3-6 , Figure 11-15 As shown, a support ring 24 is provided on the nozzle body 22 , and the radius of the support ring 24 is greater than the radius of the anchor claw through hole 33 .

[0086] A step portion 121 is provided in the radial through hole 12 .

[0087] When the grouting nozzle 2 is in the initial state, the support ring 24 falls on the step portion 121 .

[0088] When the grouting nozzle 2 is extended to the right position, the supporting ring 24 supports the swinging anchor claw 3.

[0089] In this embodiment, the swinging anchor claw 3 is supported by the supporting ring 24 , and the cooperation between the supporting ring 24 and the step portion 121 prevents the grouting nozzle 2 from falling into the grouting flow channel 11 .

[0090] The support ring 24 is arranged on the nozzle body 22, and its radius is larger than the radius of the anchor claw through hole 33. A step portion 121 is arranged in the radial through hole 12, that is, the radial through hole 12 is a step hole, which includes a thicker section and a thinner section, and the step portion 121 is formed at the junction of the thicker section and the thinner section, the nozzle body 22 passes through the thinner section, and the support ring 24 is in the thicker section and can slide.

[0091] When the grouting nozzle 2 is in the initial state, the support ring 24 falls on the step portion 121 to play a positioning role to prevent the grouting nozzle 2 from falling into the grouting flow channel 11.

[0092] When the grouting nozzle 2 slides outward, the support ring 24 slides outward accordingly, and after the nozzle outlet 23 passes through the anchor claw through hole 33, the support ring 24 can support the edge of the anchor claw through hole 33, so that the swinging anchor claw 3 swings outward. After the swinging anchor claw 3 swings, the support ring 24 supports the edge of the anchor claw through hole 33 close to the pivot axis 311.

[0093] In one embodiment, if Figure 5 , Figure 8-9 and Fig.15 As shown, a bottom groove 332 is provided at the bottom of the hole wall of the anchor claw through hole 33 close to the anchor claw tail end 31 .

[0094] A first tooth portion 241 is formed on a side surface of the support ring 24 facing the fluke tail end 31 .

[0095] When the grouting nozzle 2 is extended to the right position, the portion of the support ring 24 having the first tooth portion 241 enters the bottom groove 332 , and the bottom corner 333 of the bottom groove 332 engages with the first tooth portion 241 .

[0096] In this embodiment, a bottom groove 332 is provided at one side of the bottom of the anchor claw through hole 33. The bottom groove 332 is located on the side close to the pivot shaft 331 and is used to accommodate a part of the support ring 24. The surface of the support ring 24 facing the pivot shaft 331 is provided with a first tooth portion 241, which is composed of a plurality of saw teeth.

[0097] When the grouting nozzle 2 is extended to the right position, a part of the support ring 24 enters the bottom groove 332, and a part of the first tooth portion 241 also enters the bottom groove 332, and the bottom angle 333 of the bottom groove 332 engages with the first tooth portion 241 to prevent the swinging anchor claw 3 from resetting.

[0098] In one embodiment, if Fig.13 As shown, the liquid outlet end 23 of the nozzle has a liquid outlet conical surface 230, and the radius of the liquid outlet conical surface 230 gradually decreases along the radial direction of the grouting pipe 1.

[0099] When the grouting nozzle 2 is extended to the right position, the hole wall of the anchor claw through hole 33 away from the anchor claw tail end 31 is in a fit state with the conical surface 230 of the liquid outlet end.

[0100] In this embodiment, the liquid outlet end 23 of the nozzle is a conical structure, which has a liquid outlet conical surface 230. In the direction from the nozzle liquid inlet end 21 to the nozzle liquid outlet end 23, the radius of the liquid outlet conical surface 230 gradually decreases, which is convenient for passing through the anchor claw through hole 33, and also increases the gap between the hole wall of the anchor claw through hole 33 and the nozzle liquid outlet end 23. After the swinging anchor claw 3 swings a certain angle, the hole wall of the anchor claw through hole 33 will contact the liquid outlet conical surface 230, which ensures the extension length of the nozzle liquid outlet end 23 and the swinging angle of the swinging anchor claw 3.

[0101] When the grouting nozzle 2 is extended to the right position, the hole wall of the anchor claw through hole 33 away from the pivot shaft 311 is in contact with the conical surface 230 of the liquid outlet end, indicating that the swinging anchor claw 3 is pushed to the maximum swing angle, which also plays a role in effectively preventing the swinging anchor claw 3 from resetting.

[0102] In one embodiment, if Figure 5 , Fig. 9 and Fig.15 As shown, the conical surface 230 at the liquid outlet is provided with a second tooth portion 231 , and the hole wall of the anchor claw through hole 33 away from the anchor claw tail end 31 is provided with a third tooth portion 331 .

[0103] When the grouting nozzle 2 is extended to the right position, the third tooth portion 331 is engaged with the second tooth portion 231 .

[0104] In this embodiment, the conical surface 230 of the liquid outlet is provided with a second tooth portion 231, which is composed of a plurality of saw teeth. The wall of the anchor claw through hole 33 away from the pivot shaft 311 is provided with a third tooth portion 331, which is composed of a plurality of saw teeth.

[0105] When the grouting nozzle 2 is extended to the right position, the third tooth portion 331 is engaged with the second tooth portion 231, which can effectively prevent the hole wall from being separated from the conical surface 230 of the liquid outlet end, so as to stably support the swinging anchor claw 3.

[0106] In one embodiment, Figure 4 , Figure 6 and Figure 13-14 As shown, a telescopic pin 25 is provided on the nozzle body 22 .

[0107] One end of the radial through hole 12 connected to the grouting channel 11 is provided with a bell mouth 122 for guiding the telescopic pin 25 to pass through.

[0108] When the grouting nozzle 2 is extended to the right position, the telescopic pin 25 falls on the step portion 121 .

[0109] In this embodiment, in order to keep the grouting nozzle 2 in the extended state, a telescopic pin 25 is provided on the circumferential surface of the nozzle body 22. The telescopic pin 25 is extended from the mounting hole of the nozzle body 22 by a spring drive.

[0110] The inner end opening of the radial through hole 12 is configured as a bell mouth 122 for guiding the telescopic pin 25 to pass through.

[0111] When the grouting nozzle 2 slides outward, the telescopic pin 25 passes through the bell mouth 122 and is squeezed by the wall of the bell mouth 122 to retract into the mounting hole of the nozzle body 22 , and then slides through the thinner section of the radial through hole 12 along with the nozzle 22 .

[0112] When the grouting nozzle 2 is extended to the right position, the telescopic pin 25 reaches the thicker section of the radial through hole 12, and the telescopic pin 25 extends and falls on the step portion 121, thereby preventing the grouting nozzle 2 from falling back.

[0113] In one embodiment, if Figure 3-4As shown, the nozzle liquid inlet end 21 has a liquid inlet end conical surface 211. Along the direction from the nozzle liquid inlet end 21 to the nozzle liquid outlet end 23, the radius of the liquid inlet end conical surface 211 gradually increases, which is conducive to converting the impact force of the transversely flowing slurry into the thrust of the radial sliding of the grouting nozzle 2.

[0114] In one embodiment, if Figure 1 , Figure 3-4 , Figure 11-14 As shown, a conical elastic flow guide cover 4 is connected between the liquid inlet end 21 of the nozzle and the inner surface of the pipe wall 10 to prevent slurry from entering between the liquid inlet end 21 of the nozzle and the inner surface of the pipe wall 10, thereby hindering the grouting nozzle 2 from sliding out radially.

[0115] In the direction from the liquid inlet end 21 of the nozzle to the liquid outlet end 23 of the nozzle, the radius of the conical surface 211 of the liquid inlet end gradually increases, which is beneficial to guide the slurry to flow toward the liquid outlet end 23 of the nozzle.

[0116] The elastic air guide cover 4 can be a trumpet-shaped rubber cover or a rubber ring.

[0117] In one embodiment, if Figure 3 and Figure 7 As shown, the groove wall of the anchor claw receiving groove 13 is provided with an elastic sheet 14. When the swing anchor claw 3 is accommodated in the anchor claw receiving groove 13, the elastic sheet 14 presses the anchor claw head end 32 to prevent the swing anchor claw 3 from swinging out of the anchor claw receiving groove 13 when the grouting pipe 1 is laid.

[0118] In one embodiment, if Fig.10 As shown, the outer surface of the swinging anchor claw 3 is a curved surface 35 adapted to the outer surface of the pipe wall 10, so that the surface of the grouting pipe 1 is relatively smooth, which is convenient for laying and can also reduce the impact on the hole wall of the grouting borehole.

[0119] The fluke head end 32 has a tip portion 321. After the fluke head end 32 is swung out, the tip portion 321 is used to facilitate insertion into the surrounding soft formation.

[0120] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0121] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A grouting device for mines suitable for soft formations, characterized in that: It comprises a grouting pipe, a plurality of grouting nozzles which are slidably connected to the pipe wall of the grouting pipe and can slide and retract along the radial direction, and a plurality of swinging anchor claws which are pivotally connected to the pipe wall and can be supported by the grouting nozzles; The liquid inlet end of the grouting nozzle is located in the grouting flow channel of the grouting pipe, the nozzle body of the grouting nozzle slides through the radial through hole of the pipe wall, and the liquid outlet end of the grouting nozzle faces the swinging anchor claw; An anchor claw receiving groove is provided on the outer peripheral surface of the pipe wall corresponding to the position of each grouting nozzle, and the tail end of the anchor claw of the swing anchor claw can be pivotally installed in the anchor claw receiving groove; The anchor claw body of the swinging anchor claw is provided with an anchor claw through hole for the liquid outlet end of the nozzle to pass through, and a detachable plugging cover is provided in the anchor claw through hole; When the grouting pipe is in the grouting state, the grouting nozzle is in the extended state, and the liquid outlet end of the nozzle can flush the detachable plugging cover and extend the grouting from the anchor claw through hole, while driving the swinging anchor claw to swing outward, and the anchor claw head end of the swinging anchor claw swings out of the anchor claw receiving groove to be inserted into the surrounding soft formation; A support ring is provided on the nozzle body, and the radius of the support ring is larger than the radius of the anchor claw through hole; a step portion is provided in the radial through hole; when the grouting nozzle is in an initial state, the support ring falls on the step portion; when the grouting nozzle is extended into place, the support ring holds up the swinging anchor claw; A telescopic pin is provided on the nozzle body; a bell mouth is provided at one end of the radial through hole connected to the grouting flow channel for guiding the telescopic pin to pass through; when the grouting nozzle is extended into place, the telescopic pin falls on the step portion to keep the grouting nozzle in the extended state.

2. A grouting device for mines suitable for soft formations according to claim 1, characterized in that: A bottom groove is provided at the bottom of the hole wall of the anchor claw through hole close to the tail end side of the anchor claw; The side surface of the support ring facing the tail end of the fluke is provided with a first tooth portion; When the grouting nozzle is extended into place, the portion of the support ring having the first tooth portion enters the bottom groove, and the bottom angle of the bottom groove engages with the first tooth portion.

3. A grouting device for mines suitable for soft formations according to claim 1, characterized in that: The liquid outlet end of the nozzle has a liquid outlet conical surface, and the radius of the liquid outlet conical surface gradually decreases along the radial direction of the grouting pipe; When the grouting nozzle is extended to the right position, the hole wall of the anchor claw through hole away from the tail end of the anchor claw is in a fitting state with the conical surface of the liquid outlet end.

4. A grouting device for mines suitable for soft formations according to claim 3, characterized in that: The conical surface of the liquid outlet end is provided with a second tooth portion, and the hole wall of the anchor claw through hole away from the tail end of the anchor claw is provided with a third tooth portion; When the grouting nozzle is extended into place, the third tooth portion is engaged with the second tooth portion.

5. The grouting device for mines suitable for soft formations according to claim 1, characterized in that: The liquid inlet end of the nozzle has a liquid inlet end conical surface, and the radius of the liquid inlet end conical surface gradually increases along the direction from the liquid inlet end of the nozzle to the liquid outlet end of the nozzle.

6. A grouting device for mines suitable for soft formations according to claim 5, characterized in that: A conical elastic flow guide cover is connected between the liquid inlet end of the nozzle and the inner surface of the tube wall; In the direction from the liquid inlet end of the nozzle to the liquid outlet end of the nozzle, the radius of the conical surface of the liquid inlet end gradually increases.

7. A grouting device for mines suitable for soft formations according to claim 1, characterized in that: The groove wall of the anchor claw receiving groove is provided with an elastic sheet; When the swing fluke is received in the fluke receiving groove, the elastic sheet presses the fluke head end.

8. The grouting device for mines suitable for soft formations according to claim 1, characterized in that: The outer surface of the swinging fluke is a curved surface adapted to the outer surface of the tube wall, and the fluke head end has a tip portion.

Images