CN210622829U - Gob entry driving coal pillar anchor bar structure - Google Patents
Gob entry driving coal pillar anchor bar structure Download PDFInfo
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- CN210622829U CN210622829U CN201920346759.3U CN201920346759U CN210622829U CN 210622829 U CN210622829 U CN 210622829U CN 201920346759 U CN201920346759 U CN 201920346759U CN 210622829 U CN210622829 U CN 210622829U
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Abstract
The utility model discloses a gob entry driving coal pillar anchor bar structure, which relates to the technical field of coal mine tunnel construction, and comprises a fixed section, a connecting section and a replacement section, wherein two ends of the connecting section are respectively used for connecting the fixed section and the replacement section; the linkage segment includes the outer tube and set up in preceding inner tube, lock pipe, replacement section connecting block and back inner tube in the outer tube, the lock pipe is used for locking the canned paragraph, replacement section connecting block is used for connecting replacement section and linkage segment. The utility model discloses be convenient for insert and take out replacement section muscle material, consolidate the coal pillar to can guarantee that the intensity of coal pillar maintains a higher, more stable level, be favorable to the stability in tunnel.
Description
Technical Field
The utility model relates to a coal mine tunnel construction technical field especially relates to a gob entry driving coal pillar anchor bar structure.
Background
Gob-side entry driving is a mining roadway arrangement method widely adopted by coal mines at present. The roadway is formed by only remaining narrow coal pillars (usually 3-5 m) along the edge of the goaf. Because the stress field of the part affected by mining is low, but the damage is also serious, the roadway has large deformation, especially the coal pillar on one side of the goaf. The strength of the coal pillar is improved, the maintenance of a roadway is facilitated, and the coal pillar has a great promotion effect on coal production.
The method for improving the strength of the coal pillar is multiple, wherein restraint (confining pressure) is applied to the coal pillar, so that the strength of the coal pillar can be improved by 2-5 times. The anchor cable is one of the important methods for applying confining pressure to the coal pillar. The method for reinforcing the coal pillars by penetrating anchor cables in the method for reinforcing the thin coal pillars among multiple roadway roadways (ZL201310014594.7) is suitable for reinforcing the coal pillars with exposed two sides. However, this method is limited to the case where both sides of the coal pillar cannot be exposed simultaneously (as shown in fig. 12, the left side of the coal pillar is buried in the caving coal rock fragments along with the mining advance and the roof caving, and then a roadway (also called a gateway, the same below) formed along the gob-side entry driving is formed, that is, the right side of the coal pillar is buried for a period of time).
At present, the degree of mechanization of tunnelling is high, uses extensively, but the equipment of combining the digger can't cut off the steel strand wires in the anchor rope, and the steel strand wires can cause certain damage to the machine of combining the digger on the contrary, simultaneously because of the impaired unable anchor or the anchor quality greatly reduced of steel strand wires. The dilemma is encountered when the Zhengzhou subway shield method is built, and in order to eliminate the influence of the steel strand left by the previous engineering on the shield machine and the shield construction, the cost of only processing the anchor cable exceeds 1 million yuan per year of RMB.
Although a telescopic through anchor rope for bidirectional coal pillar reinforcement (ZL201510997211.1) can solve the problem of reinforcement of a coal pillar when two sides of the coal pillar are not exposed simultaneously, the through anchor rope has one-rope dual-purpose limitation, the anchoring force is small due to the fact that an anchoring agent is close to a goaf when the anchor rope is used as a common anchor rope in advance, the comprehensive excavation construction can be influenced due to the fact that the anchor rope is too long, steel stranded wires are difficult to pull from a connecting sleeve due to too short anchor rope, and the effect of locking the steel stranded wires by a rubber clamp ring is obviously inferior to that of steel locking plates and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gob entry driving coal pillar anchor bar structure to solve the above-mentioned problem that prior art exists, be convenient for insert and take out replacement section muscle material, consolidate the coal pillar, and guarantee that the intensity of coal pillar maintains a higher, more stable level, be favorable to the stability in tunnel.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides a gob-side entry driving coal pillar anchor bar structure, which comprises a fixed section, a connecting section and a replacement section, wherein two ends of the connecting section are respectively used for connecting the fixed section and the replacement section; the connecting section comprises an outer pipe, a front inner pipe, a locking pipe, a replacement section connecting block and a rear inner pipe, wherein the front inner pipe, the locking pipe, the replacement section connecting block and the rear inner pipe are arranged in the outer pipe; the locking pipe is used for locking the fixing section, and the displacement section connecting block is used for connecting the displacement section and the connecting section.
Preferably, the fixed section comprises a fixed rib material, and the fixed rib material is a high-strength rib material; the replacement section comprises a replacement rib material, when one side of the coal pillar is exposed firstly, the replacement rib material is a brittle rib material, after the other side of the gob-side entry driving coal pillar is excavated, the brittle rib material is replaced into a high-strength rib material, and the diameter of the brittle rib material is larger than that of the high-strength rib material; the high-strength rib materials are steel strands, and the brittle rib materials are glass fiber reinforced plastic rod bodies.
Preferably, a PVC thin sleeve is additionally arranged on the brittle reinforcing material at one end of the replacement section, which is close to the connection section, and the length of the PVC thin sleeve is based on that the PVC thin sleeve just enters a roadway of a later gob-side entry driving in theory.
Preferably, the outer pipe is a high-strength steel pipe and is provided with a full-length inner wire; the front inner pipe and the rear inner pipe are connected with the outer pipe through screw threads.
Preferably, the lock tube is in threaded connection with the outer tube, and a bidirectional steel locking plate is arranged inside the lock tube; the locking pipe is an inner pipe with wedge-shaped openings at two ends and is used as a support of the two-way steel locking plate; the inner end of the front inner tube is processed into a wedge-shaped opening, and the outer end of the front inner tube is provided with an inner wire which is in threaded connection with the brittle rib material.
Preferably, the replacement section connecting block comprises a clamping block, a locking plate control block, a spring, a steel locking plate and an iron plate; the clamping block is used for clamping the locking plate control block, and the locking plate control block is connected with the steel locking plate through the iron sheet; the spring is further arranged in the clamping block, and two ends of the spring are respectively fixed on the locking plate control block and the bottom plate of the clamping block.
Preferably, the outer edge of the locking plate control block is provided with 3 lugs which are uniformly spaced, the diameter of a circumference formed by the peripheries of the lugs is consistent with the inner diameter of the outer tube, and each lug is connected with one steel locking plate through the iron sheet; the middle part of the locking plate control block is externally connected with a circular rib groove for inserting and placing the replacement rib, and a small hole is formed in the middle of the rib groove and corresponds to the cross groove in the clamping block.
Preferably, the clamping block is a barrel-shaped component uniformly provided with 3 wide grooves along the circumference, the opening end of the barrel is provided with 3 inner convex blocks, and the inner convex blocks are used for clamping the padlock sheet control block; the fixture block is in threaded connection with the outer pipe, and the cross groove is formed in the middle of the bottom plate of the fixture block.
The utility model discloses for prior art gain following technological effect:
1. the dual-purpose of one rib (cable) is really realized, and the brittle rib material can be longer, so that the brittle rib material can be used as a common long anchor cable in the early stage to control the stability of the solid coal side on the side of a mining area, and the brittle rib material is replaced in the later stage to become a through anchor rib to reinforce the coal pillar;
2. when the anchor cable is used as a common long anchor cable, the anchor cable can be anchored in a full length manner, and can also be an end anchor and a lengthened anchor;
3. the steel lock sheet is used for locking the reinforcing steel bars, so that the bearing capacity provided by the steel lock sheet is large when the steel lock sheet is used as a penetrating anchor bar;
4. the replacement section is provided with a thin sleeve on the brittle rib material close to one end of the connection section, so that an anchoring agent is not adhered during anchoring, and the replacement is easy in later period;
5. the diameter of the high-strength rib material at the displacement section is slightly smaller than that of the brittle rib material at the original position, so that the high-strength rib material is easy to insert, install and take out;
6. the construction of the fully-mechanized excavating machine along the gob-side entry driving is not influenced, and the construction of the fully-mechanized excavating machine has no influence on the function of penetrating the anchor bars.
7. The cooperation can repeat slip casting patent technique, plays the reinforcing action to broken coal column, and the intensity of coal column will always be maintained a higher, more stable level, and is more favorable to the stability in tunnel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only 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 the overall structure of a gob-side entry-driving coal pillar anchor bar structure;
FIG. 2 is a schematic structural diagram of a locking plate control block;
FIG. 3 is a schematic structural diagram of a fixture block;
FIG. 4 is a 3D diagram of a connecting structure of a locking plate control block and a clamping block;
FIG. 5 is a schematic view of a combination structure of the locking plate control block and the fixture block when they are not embedded;
FIG. 6 is a 3D view of FIG. 5;
FIG. 7 is a schematic view of a combination structure of the locking plate control block and the locking block;
FIG. 8 is a 3D view as in FIG. 7;
FIG. 9 is a schematic structural view of a brittle rib of a displacement section;
FIG. 10 is a schematic view of the installation of the high strength tendons of the replacement section;
FIG. 11 is a schematic view of the replacement of the high strength tendons in the replacement section;
FIG. 12 is a schematic view of reinforcement of anchor bars along a gob-side entry-driving coal pillar;
the device comprises a fixing section 1, a fixing section 2, a connecting section 3, a replacing section 4, a lock 5, a backing plate 6, a rear inner tube 7, a fixing rib material 8, an outer tube 9, a locking tube 10, a clamping block 11, an iron sheet 12, a front inner tube 13, a bidirectional steel locking sheet 14, a spring 15, a locking sheet control block 16, a steel locking sheet 17, a PVC thin sleeve 18, a replacing rib material 19, a rib material groove 20, an inner bump 21, a cross groove 22, an anchor bar 23, a coal pillar 24, a stope face 1 crossgroove 25, a stope face 2 crossgroove 26, a roof caving area 27 and a coal body.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1 to 12, the gob-side entry driving coal pillar anchor bar structure in this embodiment includes a fixed section 1, a connection section 2, and a replacement section 3, and the previous total length thereof is determined by calculation according to a roadway support theory. The anchor bar 22 of this embodiment plays a muscle dual-purpose effect, is used for consolidating the entity coal side on goaf side in the earlier stage, then becomes to wearing anchor bar 22 after the later stage replaces brittle reinforcement material, consolidates the coal pillar.
The fixed section 1 comprises fixed tendons 7, made of high-strength tendons, typically steel strands.
The replacement section 3 comprises replacement ribs 18, and when the coal pillar is exposed at one side firstly, the replacement section is composed of brittle ribs, usually glass fiber reinforced plastic rod bodies, the diameter of which is slightly larger than that of the replaced high-strength ribs; and after the other side of the gob-side entry-driving coal pillar 23 is excavated, replacing the brittle reinforcing material with a high-strength reinforcing material. Because the anchor bars 22 play a role in supporting the solid coal side on the side edge of the anchor bars 22 in the stoping process of the previous working face, the length of the brittle reinforcement materials is determined by subtracting the lengths of the fixed section 1 and the connecting section 2 from the designed initial total length of the anchor bars 22, and the effective length of the replaced high-strength reinforcement materials is determined by subtracting the lengths of the fixed section 1 and the connecting section 2 from the width of the coal pillar.
The replacement section 3 is provided with a PVC thin sleeve 17 on the brittle rib material close to one end of the connecting section 2 so as to prevent the adhesion of an anchoring agent during anchoring and facilitate replacement in the later period. The length of the thin sleeve is determined on the basis that the thin sleeve is just entered into a roadway along a gob-side entry driving way.
The connecting section 2 consists of an outer tube 8, a front inner tube 12, a locking tube 9, a replacing section connecting block and a rear inner tube 6.
The outer pipe 8 is a high-strength steel pipe with a full-length inner wire.
The rear inner pipe 6 is positioned on the side, exposed firstly, of the coal pillar 23 and is connected with the outer pipe 8 in a threaded mode to provide a supporting force for the locking pipe 9.
The front inner pipe 12 is positioned at the exposed side behind the coal pillar and is connected with the outer pipe 8 through screw threads. The inner end of the front inner tube 12 is processed into a wedge shape to be used as a support of the steel locking plate 16. The outer end of the inner tube is provided with an inner wire which is connected with the brittle rib material in a threaded manner, the outer end is designed to be provided with the inner wire so as to install the brittle rib material, and after the brittle rib material is replaced by the high-strength rib material, the inner wire is not used, but the wedge-shaped opening end of the inner tube 12 is locked before the use.
The replacement section connecting block is an important element for connecting the replacement section 3 and the connecting section 2, and consists of a clamping block 10, a locking plate control block 15, a spring 14, a steel locking plate 16 and an iron plate 11.
The locking plate control block 15 has 3 evenly spaced lugs at the outer edge, the diameter of the circumference formed by the periphery of the lugs is consistent with the inner diameter of the outer tube 8, each lug is provided with a steel locking plate 16 connected through an elastic iron sheet 11, the middle part of the locking plate control block 15 is externally connected with a circular rib groove 19 for inserting and placing ribs, the middle of the rib groove 19 is provided with a small hole, and the small hole corresponds to a cross groove 21 on the bottom plate of the fixture block 10 (the small hole and the cross groove 21 are used for installing the assembly of the locking plate control block 15 and the fixture block 10).
The clamping block 10 is a barrel-shaped part which is uniformly provided with 3 wide grooves along the circumference and is in threaded connection with the outer pipe 8, the opening end of the barrel is provided with 3 inner convex blocks 20, and the inner convex blocks 20 are used for clamping the padlock sheet control block 15. When the inner convex block 20 is hung on the locking plate control block 15, the replacement section connecting block is easy to install in the outer tube 8, and after the fragile rib materials are removed, the high-strength rib materials can stretch into and be taken out from the front inner tube 12. When the high-strength rib material stretches into the rib material groove 19 on the direct locking plate control block 15, the locking plate control block 15 is extruded and rotated by a certain angle, the locking plate control block 15 is separated from the clamping block 10, the spring 14 pushes the locking plate control block 15 to move, 3 steel locking plates connected with the iron plate 11 enter the wedge-shaped end of the front inner tube 12, and along with the stretching of the high-strength rib material, the steel locking plates and the wedge-shaped opening act together to lock the high-strength rib material. When knocking the locked high-strength rib material along the axial direction, the high-strength rib material and the steel locking piece can gradually exit from the wedge-shaped opening, so that the high-strength rib material is loosened, the high-strength rib material pushes the rib material groove 19 on the locking piece control block 15, the locking piece control block 15 is continuously pushed, the locking piece control block 15 is pressed into the clamping block 10, the high-strength rib material is rotated, the clamping block 10 is hung on the locking piece control block 15, and the high-strength rib material can be slightly pulled out from the inner tube 12 in the front.
The locking pipe 9 is a locking device of the reinforcing material of the fixed section 1 and is connected with the outer pipe 8 in a threaded mode. It is an inner tube with wedge-shaped openings at two ends and is used as a support of a two-way steel locking plate 13.
Assembly of the anchor bars 22 (as shown in fig. 1 to 11):
1. the high-strength rib materials of the fixed section 1 are bidirectionally locked in the lock tube 9, and the rear inner tube 6 and the lock tube 9 with the high-strength rib materials are screwed into the outer tube 8 together through the joggle joint of the rear inner tube 6 and the lock tube 9.
2. The locking plate control block 15 is pressed in and spun (preferably anticlockwise rotated) to enter the fixture block 10, the spring 14 in the fixture block 10 stably extrudes the locking plate control block 15 under the inner convex block 20 of the fixture block 10, an electric screwdriver penetrates through a small hole in the middle of the locking plate control block 15 to reach a cross (screw) groove 21 in a bottom plate of the fixture block 10, a power supply is started, and the fixture block 10 and the locking plate control block 15 are synchronously and smoothly spun to enter the outer tube 8.
3. Screwing the front inner pipe 12 into the outer pipe 8, and checking the installation of the replacement section connecting block by inserting and pulling out the high-strength rib materials until the replacement section connecting block is qualified.
4. And screwing in the brittle reinforcing material, and adding a PVC thin sleeve 17 on the brittle reinforcing material close to one end of the connecting section 2, wherein the length of the thin sleeve is based on that the thin sleeve just enters a roadway of a later gob-side entry driving in theory.
5. For a full anchor or a lengthened anchor which needs to be anchored at the fixing section 1, a hoop is arranged on the high-strength rib material of the fixing section 1, and the diameter of the hoop is slightly smaller than that of a drilled hole so as to prevent the anchoring agent from overflowing. For the end anchor, the connecting segment 2 acts as an anchoring agent barrier and does not need to be provided. At this point, the assembly of the tendon 22 is complete.
Field installation of the anchor bars 22:
1. drilling, namely drilling holes at the anchor positions on the exposed side of the coal pillar 23 in advance, wherein the diameter of the drilled holes is about 5mm larger than that of the connecting section 2 of the anchor bars 22, the depth of the drilled holes is about 10cm larger than the pre-designed length of the anchor bars 22 (the pre-designed length of the anchor bars 22 is determined by calculation according to the roadway support theory), or drilling holes with the diameter just larger than that of the brittle reinforcement materials by 5 mm-8 mm, and then reaming the holes to the far end of the connecting section 2 in the coal body 27 by using larger drill bits;
2. and (3) putting a resin cartridge (namely, an anchoring agent), if the drilled hole is a double-diameter hole, sending the resin cartridge (namely, the anchoring agent) to the bottom of the hole by using a simple conveying device (a roll sending device), spinning the anchor rib 22 into the drilled hole by using an anchor rod drilling machine, puncturing the resin cartridge, fully stirring, and firmly anchoring the anchor rib 22 in the hole.
3. And adding a backing plate to stretch and lock the anchor bars 22, wherein the anchor bars 22 play a role of a common anchor cable and bear the influence of mining, so that the roadway is stably supported.
4. When the later stage (the next working face roadway is excavated, and the previous working face roadway is buried by the crushed coal rock blocks due to the caving of the working face top plate) is excavated to the position of the anchor bar 22 along the empty roadway, the comprehensive excavating machine cuts off the brittle bar materials in the existing anchor bar 22, and the other side surface of the coal pillar is formed. And (3) disassembling the broken brittle rib, keeping the anchoring body and the PVC thin sleeve in the hole, inserting the high-strength rib along the thin sleeve, and locking the inner end of the high-strength rib through the self-locking device of the connecting section 2. Because the high-strength rib material is slightly smaller than the brittle rib material at the original position, the high-strength rib material is easy to insert and mount.
5. Add the backing plate, carry out stretch-draw locking to the anchor bar 22 after the replacement, anchor bar 22 at this moment has become to wearing the anchor rope, has played the lock hoop effect to the coal pillar, improves the intensity of coal pillar greatly, maintains this tunnel stable.
6. If the repeatable grouting patent technology is matched in time, the broken coal pillars (which are broken to a certain extent after being subjected to one-time mining influence) are reinforced, the strength of the coal pillars can always maintain a higher and more stable level, and the stability of the roadway is more favorable.
The whole process of the construction of the gob-side entry-driving coal pillar anchor bar 22 can be briefly described as follows: as shown in fig. 12, the stope face 1 is excavated in advance along the groove 24, and the construction of the anchor bars 22 is completed; then, coal mining is carried out on the stope face 1, along with the stope, the coal body on the right side is deformed and locally damaged, the rear top plate collapses to form a collapse area, and the roadway of the section is buried; after the stope face 1 finishes stoping, a stope face 2 crossheading 25 is tunneled in a right coal body 27 of a crossheading 24 of the stope face 1 (the roadway technology is called gob-side entry driving), along with a fully-mechanized excavation process, a part of brittle reinforcing materials entering a newly-excavated roadway in the anchor bars 22 are cut off, the rest brittle reinforcing materials are unloaded, the high-strength reinforcing materials of the replacement section 3 are installed, tensioning and locking are carried out, and all construction of gob-side entry driving coal column anchor bars is finished.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. The utility model provides a gob entry driving coal pillar anchor bar structure which characterized in that: the device comprises a fixed section, a connecting section and a replacing section, wherein two ends of the connecting section are respectively used for connecting the fixed section and the replacing section; the connecting section comprises an outer pipe, a front inner pipe, a locking pipe, a replacement section connecting block and a rear inner pipe, wherein the front inner pipe, the locking pipe, the replacement section connecting block and the rear inner pipe are arranged in the outer pipe; the locking pipe is used for locking the fixing section, and the displacement section connecting block is used for connecting the displacement section and the connecting section.
2. The gob-side entry driving coal pillar anchor bar structure according to claim 1, characterized in that: the fixing section comprises a fixing rib material, and the fixing rib material is a high-strength rib material; the replacement section comprises a replacement rib material, when one side of the coal pillar is exposed firstly, the replacement rib material is a brittle rib material, after the other side of the gob-side entry driving coal pillar is excavated, the brittle rib material is replaced into a high-strength rib material, and the diameter of the brittle rib material is larger than that of the high-strength rib material; the high-strength rib materials are steel strands, and the brittle rib materials are glass fiber reinforced plastic rod bodies.
3. The gob-side entry driving coal pillar anchor bar structure according to claim 2, characterized in that: a PVC thin sleeve is additionally arranged on the brittle reinforcing material at one end, close to the connecting section, of the replacement section, and the length of the PVC thin sleeve is based on that the PVC thin sleeve is just entered into a roadway of a later gob-side entry driving in theory.
4. The gob-side entry driving coal pillar anchor bar structure according to claim 1, characterized in that: the outer pipe is a high-strength steel pipe and is provided with a full-length inner wire; the front inner pipe and the rear inner pipe are connected with the outer pipe through screw threads.
5. The gob-side entry driving coal pillar anchor bar structure according to claim 3, characterized in that: the lock tube is connected with the outer tube through screw threads, and a bidirectional steel locking plate is arranged inside the lock tube; the locking pipe is an inner pipe with wedge-shaped openings at two ends and is used as a support of the two-way steel locking plate; the inner end of the front inner tube is processed into a wedge-shaped opening, the outer end of the front inner tube is provided with an inner wire, and the front inner tube is connected with the brittle rib material through a screw thread.
6. The gob-side entry driving coal pillar anchor bar structure according to claim 2, characterized in that: the replacement section connecting block comprises a clamping block, a locking plate control block, a spring, a steel locking plate and an iron plate; the clamping block is used for clamping the locking plate control block, and the locking plate control block is connected with the steel locking plate through the iron sheet; the spring is further arranged in the clamping block, and two ends of the spring are respectively fixed on the locking plate control block and the bottom plate of the clamping block.
7. The gob-side entry driving coal pillar anchor bar structure according to claim 6, wherein: the outer edge of the locking plate control block is provided with 3 uniformly-spaced lugs, the diameter of a circumference formed by the peripheries of the lugs is consistent with the inner diameter of the outer tube, and each lug is connected with one steel locking plate through the iron sheet; the middle part of the locking plate control block is externally connected with a circular rib groove for inserting and placing the replacement rib, and a small hole is formed in the middle of the rib groove and corresponds to the cross groove in the clamping block.
8. The gob-side entry driving coal pillar anchor bar structure according to claim 7, wherein: the fixture block is a barrel-shaped part uniformly provided with 3 wide grooves along the circumference, the opening end of the barrel is provided with 3 inner convex blocks, and the inner convex blocks are used for clamping the padlock sheet control block; the fixture block is in threaded connection with the outer pipe, and the cross groove is formed in the middle of the bottom plate of the fixture block.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920346759.3U CN210622829U (en) | 2019-03-19 | 2019-03-19 | Gob entry driving coal pillar anchor bar structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920346759.3U CN210622829U (en) | 2019-03-19 | 2019-03-19 | Gob entry driving coal pillar anchor bar structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736865A (en) * | 2019-03-19 | 2019-05-10 | 河南理工大学 | A kind of gob side entry driving coal column dowel structure and its assembling and field installation process |
| CN114542148A (en) * | 2022-04-24 | 2022-05-27 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by running ice in cold and dry areas |
-
2019
- 2019-03-19 CN CN201920346759.3U patent/CN210622829U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736865A (en) * | 2019-03-19 | 2019-05-10 | 河南理工大学 | A kind of gob side entry driving coal column dowel structure and its assembling and field installation process |
| CN109736865B (en) * | 2019-03-19 | 2024-02-06 | 河南理工大学 | Gob-side entry driving coal pillar anchor bar structure and assembly and field installation method thereof |
| CN114542148A (en) * | 2022-04-24 | 2022-05-27 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by running ice in cold and dry areas |
| CN114542148B (en) * | 2022-04-24 | 2022-07-08 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by flowing ice in cold and dry areas |
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