CN110566242A - control method for surrounding rock of top coal roadway of large-inclination soft thick coal seam - Google Patents
control method for surrounding rock of top coal roadway of large-inclination soft thick coal seam Download PDFInfo
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- CN110566242A CN110566242A CN201910774724.4A CN201910774724A CN110566242A CN 110566242 A CN110566242 A CN 110566242A CN 201910774724 A CN201910774724 A CN 201910774724A CN 110566242 A CN110566242 A CN 110566242A
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- 239000011435 rock Substances 0.000 title claims abstract description 68
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 127
- 239000010959 steel Substances 0.000 claims abstract description 127
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/20—Special cross- sections, e.g. corrugated
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The control method of the large-dip-angle soft thick coal seam supporting top coal roadway surrounding rock comprises the steps that I-steel and an active and passive combined roadway protection device are included in the roadway surrounding rock, a single-group active and passive combined roadway protection device is composed of an I-steel support, a protection plate, I-steel buckles, anchor cables, a lock and screw connectors, the I-steel support, the protection plate and the I-steel are matched in pairs, and the anchor cables, the protection plate and the I-steel are matched in pairs; the I-steel supports are arranged in parallel at intervals, a guard plate penetrates through the same side surface of the I-steel supports, the guard plate is connected with the I-steel supports through I-steel buckles and screw connectors, the anchor cables which are parallel to the I-steel supports and distributed in a staggered mode vertically penetrate through the guard plate, and the anchor cables are connected with the guard plate through a lockset; the roadway support method has the advantages that the roadway support problem of the soft surrounding rock with a large inclination angle is realized, and the problem that the control of a pure anchor rod support or a pure I-shaped steel support to the soft rock roadway is insufficient is solved.
Description
Technical Field
the invention relates to the field of underground coal mine roadway support, in particular to a control method of supporting top coal roadway surrounding rocks of a large-dip-angle soft thick coal seam.
Background
In recent years, the anchor bolt supporting theory and technology are deeply researched and developed, and the anchor bolt supporting is widely applied by the advantages of improving the stress condition of the surrounding rock body, improving the strength of the surrounding rock body and exerting the self-bearing capacity of the surrounding rock, so that the obvious technical and economic benefits are obtained.
However, the soft rock supporting problem is more outstanding, and a great deal of engineering practice in some mining areas shows that: the existing anchor bolt supporting technology still has high dependency on the occurrence conditions of the surrounding rocks of the roadway, and in a broken soft rock roadway with extremely developed joint cracks, the anchor bolt supporting is difficult to form a stable and effective bearing structure on the surrounding rocks at the shallow part of the roadway, so that the bearing capacity of the anchor bolt supporting is difficult to give full play, the strong deformation of the roadway is difficult to control, and the accidents of large-area roof collapse and collapse of the roadway are frequently caused due to the large-area failure of the anchor net supporting caused by the damage of a local bearing structure.
In order to control the deformation of the soft rock roadway, a great deal of supporting modes mainly including passive supporting, such as high-strength and small-space I-steel supports, high-grade concrete masonry arch bodies and the like have to be selected for the mine. The I-steel support has the advantages of high resistance, contractibility and strong surface protection performance, and compared with active support modes such as anchor net support and the like, passive support resistance provided by the I-steel support in a broken soft rock roadway can obviously improve the stability of a broken rock mass at the shallow part of the roadway. However, in the actual bearing process of the bracket, the bearing capacity of the bracket is greatly restricted by the bracket structure, the load distribution condition and the bracket-surrounding rock interaction relationship, and although the stress condition of the bracket is improved to a great extent by the I-steel bracket wall back filling technology, the bearing capacity of the bracket is greatly improved, the stability of the bracket structure is still poor, and the bearing capacity of the deep stable rock mass is difficult to be exerted by simple passive support, so that the bracket still has a great deal of yielding and breaking phenomena under the action of high stress.
In order to solve the problem that the control of a pure anchor rod support or a pure I-steel bracket support on a soft rock roadway is insufficient, a safe, scientific and convenient support device and process are urgently needed to solve the problems.
disclosure of Invention
in view of the above, in order to solve the defects of the prior art, the invention aims to provide a control method for supporting surrounding rocks of a top coal roadway of a soft and thick coal seam with a large inclination angle, solve the problem that a soft rock roadway is not sufficiently controlled by a simple anchor rod support or a simple i-steel bracket support, improve the support quality of the soft rock roadway as much as possible, avoid the problem of repairing a large number of roadway supports in the future, and be safe, scientific, convenient and efficient.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the control method of the supporting top coal roadway surrounding rock of the large-inclination-angle soft thick coal seam comprises I-shaped steel, and further comprises a plurality of groups of active and passive combined roadway protection devices matched with the I-shaped steel, wherein a single group of the active and passive combined roadway protection devices consists of I-shaped steel supports, guard plates, I-shaped steel buckles, anchor cables, locks and screw connectors, the I-shaped steel supports, the guard plates and the I-shaped steel are matched in pairs, and the anchor cables, the guard plates and the I-shaped steel are matched in pairs;
The I-steel supports and the six anchor cables form a group of active and passive combined roadway protection device, the I-steel supports are arranged in parallel at intervals, a protection plate is arranged on the same side surface of the I-steel supports in a penetrating mode, the protection plate is connected with the I-steel supports through I-steel buckles and screw connecting pieces, the anchor cables which are parallel to the I-steel supports and distributed in a staggered mode vertically penetrate through the protection plate, and the anchor cables are connected with the protection plate through locks;
the protective plate is provided with a plurality of hole grooves connected with the I-shaped steel buckles, the I-shaped steel buckles are correspondingly provided with connecting holes matched with the hole grooves, the connecting holes and the hole grooves are matched with the screw connecting pieces, the protective plate is also provided with a plurality of anchor cable holes matched and connected with anchor cables, and the anchor cable holes and the hole grooves are arranged on the protective plate in a staggered mode;
The control method comprises the following steps:
The method comprises the following steps: installing a temporary support: selecting a proper temporary support according to the geology and production conditions of the surrounding rock of the roadway; tunneling the corresponding section shape and size according to the operation rule;
step two: erecting the I-shaped steel;
Step three: and (3) forming an anchor cable hole on the guard plate and installing the anchor cable: selecting a proper drilling tool according to the geology and production conditions of the surrounding rock of the roadway; selecting a proper jumbolter, a drill bit and a drill rod according to the properties of the drilled coal rock mass; the depth of the drilled hole is strictly controlled within a designed range, and the diameter of the drilled hole is matched with the diameter of the anchor cable; waiting for a period of time according to the type of the resin anchoring agent, and after the waiting time is over, removing the construction machine to finish the anchoring construction;
Step four: assembling a single group of active and passive combined roadway protection devices: after the three I-shaped steel frames are installed, the guard plate is placed behind the three I-shaped steel support legs, the hole grooves in the guard plate correspond to the three I-shaped steel support legs one to one, the anchor cables penetrate through the anchor cable holes of the guard plate, the I-shaped steel buckles are installed on the guard plate through the screw connecting pieces and the screws, the three I-shaped steel support legs and the guard plate are ensured to form a whole, finally, the lock of the anchor cables is installed, and pretightening force is applied to the anchor cables.
further, the fourth step is followed by the following steps: step five: and assembling a plurality of groups of active and passive combined roadway protection devices according to the first to fourth steps to form roadway surrounding rocks.
further, the process of erecting the I-steel in the second step is as follows: the I-shaped steel is regular and powerful in posture, the phenomena of empty roof, empty side and empty shoulder pit are avoided, the joints between the I-shaped steel legs and the cross beams are tightly jointed, and if the joints are not matched, the gradient and the direction of the I-shaped steel legs are adjusted.
Further, in the third step, the error of the drilling angle is less than or equal to 6 °.
Furthermore, in the fourth step, the I-steel buckle is matched with the guard plate, and the I-steel buckle is additionally provided with the anti-friction gasket through the screw connecting piece and is tightly connected with the guard plate.
Further, the hole groove is oval.
Furthermore, the anchor cable holes are oval.
Furthermore, the connecting holes are circular holes matched with the screw connecting pieces and the screws 6.
Furthermore, a single group of the active and passive combined roadway protection device comprises 3 protection plates, and the protection plates are respectively arranged on the top surface and the two side surfaces of the three I-steel supports in a penetrating manner.
Furthermore, the guard plate is perpendicular to the I-shaped steel bracket and the anchor cable.
The invention has the beneficial effects that:
the control method of the large-dip-angle soft and thick coal seam top supporting coal roadway surrounding rock realizes the roadway support problem of large dip angles and soft surrounding rock, solves the problem that the control of a simple anchor rod support or a simple I-shaped steel bracket support on the soft rock roadway is insufficient, improves the support quality of the soft rock roadway as much as possible, avoids the problem of repairing a large number of roadway supports in the future, and is safe, scientific, convenient and efficient. The concrete aspects are as follows:
1. The anchor cable is matched with the guard plate, so that the soft surrounding rock is in a three-dimensional high surrounding pressure state, and the compressive strength of the soft surrounding rock is improved;
2. The guard plate and the I-shaped steel bracket are matched for use, so that the bracket and the bracket form a unified structure body, and the stability of the I-shaped steel bracket is improved;
3. The anchor cable, the I-steel and the guard plate are matched for use, so that active and passive combined support is formed, and the problem of insufficient independent support of the anchor cable and the I-steel is greatly solved;
4. the participation of the anchor cable enables the surrounding rock of the roadway to fully exert the self-supporting capability;
5. the stability of the broken rock mass of the shallow part of the roadway is improved by the participation of the I-shaped steel.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
FIG. 1 is a partial structural schematic view of a single-group active and passive combined roadway protection device of the present invention;
FIG. 2 is a perspective view of the shield;
FIG. 3 is a perspective view of the guard plate clasp;
FIG. 4 is a cross-sectional view of the present invention during construction;
the labels in the figure are: 1. anchor cable, 2, I-steel buckle, 3, guard plate, 4, screw connector, 5, lockset, 6, screw, 7, I-steel bracket, 8, hole slot, 9 and anchor cable hole.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
The control method of the supporting top coal roadway surrounding rock of the large-inclination soft thick coal seam comprises I-shaped steel, and further comprises a plurality of groups of active and passive combined roadway protection devices matched with the I-shaped steel, wherein a single group of the active and passive combined roadway protection devices consists of I-shaped steel supports 7, guard plates 3, I-shaped steel buckles 2, anchor cables 1, locks 5 and screw connectors 6, the I-shaped steel supports 7, the guard plates 3 and the I-shaped steel are matched in pairs, and the anchor cables 1, the guard plates 3 and the I-shaped steel are matched in pairs;
the I-steel supports 7 and the six anchor cables 1 form a group of active and passive combined roadway protection device, the I-steel supports 7 are arranged in parallel at intervals, a protection plate 3 is arranged on the same side surface of the I-steel supports 7 in a penetrating mode, the protection plate 3 is connected with the I-steel supports 7 through I-steel buckles 2 and screw connectors 6, the anchor cables 1 which are parallel to the I-steel supports 7 and distributed in a staggered mode vertically penetrate through the protection plate 3, and the anchor cables 1 are connected with the protection plate 3 through locks 5;
The protective plate 3 is provided with a plurality of hole grooves 8 connected with the I-shaped steel buckles 2, the I-shaped steel buckles 2 are correspondingly provided with connecting holes matched with the hole grooves 8, the connecting holes and the hole grooves 8 are matched with the screw connecting pieces 4, the protective plate 3 is further provided with a plurality of anchor cable holes 9 matched and connected with the anchor cables 1, and the anchor cable holes 9 and the hole grooves 8 are distributed on the protective plate 3 in a staggered mode;
The dip angle of the coal seam of the Yiluo coal mine is larger, the mined coal seam is softer, and the stoping roadway adopts a full-coal trapezoidal roadway as shown in figure 4. If the anchor bolt support is adopted, the surrounding rock at the shallow part of the roadway is difficult to form a stable and effective bearing structure, so that the bearing capacity of the anchor bolt support is difficult to give full play, the roadway is strongly deformed, and the phenomena of large-area roof collapse and collapse of the roadway are caused by large-area failure of the anchor net support induced by the damage of a local bearing structure; if the I-steel support 7 is adopted, the structural stability of the support is still poor, the used support cannot form a stable system, the bearing capacity of the deep stable rock mass is difficult to play through simple passive support, and the support still has a large number of yielding and damaging phenomena under the action of high stress. By using the invention, the phenomenon of large-area roof fall of the roadway is solved, the I-shaped steel is connected into a unified whole by using the guard plate, and the stability of the I-shaped steel is further improved by matching with the anchor cable 1;
the control method comprises the following steps:
The method comprises the following steps: installing a temporary support: selecting a proper temporary support according to the geology and production conditions of the surrounding rock of the roadway; tunneling the corresponding section shape and size according to the operation rule; in the embodiment, according to the characteristics of surrounding rocks of a tunnel with a large inclined angle of a Yiluo mine coal bed and a softer coal bed, the section is selected to be trapezoidal, and a seam tube anchor rod is selected as a temporary support;
step two: erecting the I-shaped steel; in this embodiment, the i-steel bracket is made of 12 # mining i-steel, and the guard plate specification is as follows: 1.8m 0.3m 30 mm;
step three: and (3) forming an anchor cable hole 9 on the guard plate 3, and installing the anchor cable 1: selecting a proper drilling tool according to the geology and production conditions of the surrounding rock of the roadway; selecting a proper jumbolter, a drill bit and a drill rod according to the properties of the drilled coal rock mass; the depth of the drilled hole is strictly controlled within a designed range, and the diameter of the drilled hole is matched with the diameter of the anchor cable 1; waiting for a period of time according to the type of the resin anchoring agent, wherein the time is determined according to the actual condition and the type of the resin anchoring agent, and after the waiting time is finished, removing the construction machine to finish the anchoring construction;
step four: assembling a single group of active and passive combined roadway protection devices: after all the three I-shaped steel frames are installed, the protection plate 3 is placed behind the three I-shaped steel support 7 legs, the hole grooves 8 in the protection plate 3 correspond to the three I-shaped steel support 7 legs one to one, the anchor cables 1 penetrate through the anchor cable holes 9 of the protection plate 3, then the I-shaped steel buckles 2 are installed on the protection plate 3 through the screw connecting pieces 4 and the screws 6, it is guaranteed that the three I-shaped steel support 7 legs and the protection plate 3 form a whole, finally the lock 5 of the anchor cables 1 is installed, pre-tightening force is applied to the anchor cables 1, and the pre-tightening force is determined according to actual conditions.
Furthermore, a single group of the active and passive combined roadway protection device comprises 3 guard plates 3, and the guard plates 3 are respectively arranged on the top surface and the two side surfaces of the three I-steel supports 7 in a penetrating manner, so that the stability and the safety effectiveness of the active and passive combined roadway protection device are ensured.
Further, the guard plate 3 is perpendicular to the I-steel bracket 7 and the anchor cable 1. The anchor cable 1 is matched with the guard plate 3, so that the soft surrounding rock is in a three-dimensional high surrounding pressure state, and the compressive strength of the soft surrounding rock is improved; the guard plate 3 and the I-shaped steel support 7 are matched for use, so that the support and the support form a unified structure body, and the stability of the I-shaped steel support 7 is improved.
Further, the hole groove 8 is oval. The hole slots 8 can enable the guard plate 3 to be matched with the I-shaped steel buckle 2, the screw connecting piece 4 and the screw 6, on the other hand, connecting holes in the I-shaped steel buckle 2 are round holes matched with the screw connecting piece 4 and the screw 6, the oval hole slots 8 can also guarantee adjustability of the guard plate 3 during connection and adjustment, and connection stability and reliability can also be guaranteed.
further, the anchor cable holes 9 are oval. The cable bolt holes 9 are well adapted to the cable bolts 1.
furthermore, the connecting holes are circular holes matched with the screw connecting pieces 4 and the screws 6.
Further, the fourth step is followed by the following steps: step five: and assembling a plurality of groups of active and passive combined roadway protection devices according to the first to fourth steps to form roadway surrounding rocks.
Further, the process of erecting the I-steel in the second step is as follows: the I-shaped steel is regular and powerful in posture, the phenomena of empty roof, empty side and empty shoulder pit are avoided, the joints between the I-shaped steel legs and the cross beams are tightly jointed, and if the joints are not matched, the gradient and the direction of the I-shaped steel legs are adjusted.
Further, in the third step, the error of the drilling angle is less than or equal to 6 °. Because too big stock angle has reduced the effect scope of anchor rope on the one hand, and on the other hand makes the atress condition of anchor rope worsen, is unfavorable for anchor rope to strut the full play of effect.
furthermore, in the fourth step, the I-steel buckle 2 is matched with the guard plate 3, and the I-steel buckle 2 is additionally provided with an anti-friction gasket through a screw connecting piece 4 and is tightly connected with the guard plate 3.
in conclusion, the control method for supporting the top coal roadway surrounding rock of the large-dip-angle soft and thick coal seam realizes the roadway support problem of the large-dip-angle soft surrounding rock, solves the problem that the control of a simple anchor rod support or a simple I-steel bracket support on the soft rock roadway is insufficient, improves the support quality of the soft rock roadway as much as possible, avoids the problem of repairing a large number of roadway supports in the future, and is safe, scientific, convenient and efficient. In the invention, the anchor cable 1 is matched with the guard plate 3, so that the soft surrounding rock is in a three-dimensional high surrounding pressure state, and the compressive strength of the soft surrounding rock is improved; the guard plate 3 and the I-shaped steel bracket 7 are matched for use, so that the bracket and the bracket form a uniform structural body, and the stability of the I-shaped steel bracket is improved; the anchor cable 1, the I-steel and the guard plate 3 are matched for use, active and passive combined support is formed, and the problem that the independent support of the anchor cable 1 and the I-steel is insufficient is greatly solved; the participation of the anchor cable 1 enables the surrounding rock of the roadway to fully exert the self-bearing capacity; the stability of the broken rock mass of the shallow part of the roadway is improved by the participation of the I-shaped steel.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The control method of the large-inclination soft thick coal seam top supporting coal roadway surrounding rock comprises I-shaped steel, and is characterized in that: the single-group active and passive combined roadway protection device consists of an I-steel support (7), a protection plate (3), I-steel buckles (2), anchor cables (1), a lock (5) and a screw connector (6), wherein the I-steel support (7), the protection plate (3) and the I-steel are matched in pairs, and the anchor cables (1), the protection plate (3) and the I-steel are matched in pairs;
the roadway protection device comprises three I-steel supports (7) and six anchor cables (1) which form a group of active and passive combined roadway protection devices, wherein the I-steel supports (7) are arranged in parallel at intervals, a protection plate (3) is arranged on the same side surface of the three I-steel supports (7) in a penetrating mode, the protection plate (3) is connected with the I-steel supports (7) through I-steel buckles (2) and screw connectors (6), the anchor cables (1) which are parallel to the I-steel supports (7) and distributed in a staggered mode vertically penetrate through the protection plate (3), and the anchor cables (1) are connected with the protection plate (3) through locksets (5);
the protective plate (3) is provided with a plurality of hole grooves (8) connected with the I-steel buckles (2), the I-steel buckles (2) are correspondingly provided with connecting holes matched with the hole grooves (8), the connecting holes and the hole grooves (8) are matched with the screw connecting piece (4), the protective plate (3) is further provided with a plurality of anchor cable holes (9) matched and connected with the anchor cables (1), and the anchor cable holes (9) and the hole grooves (8) are distributed on the protective plate (3) in a staggered mode;
The control method comprises the following steps:
the method comprises the following steps: installing a temporary support: selecting a proper temporary support according to the geology and production conditions of the surrounding rock of the roadway; tunneling the corresponding section shape and size according to the operation rule;
step two: erecting the I-shaped steel;
Step three: and arranging anchor cable holes (9) on the guard plate (3) and installing the anchor cables (1): selecting a proper drilling tool according to the geology and production conditions of the surrounding rock of the roadway; selecting a proper jumbolter, a drill bit and a drill rod according to the properties of the drilled coal rock mass; the depth of the drilled hole is strictly controlled within a designed range, and the diameter of the drilled hole is matched with that of the anchor cable (1); waiting for a period of time according to the type of the resin anchoring agent, and after the waiting time is over, removing the construction machine to finish the anchoring construction;
Step four: assembling a single group of active and passive combined roadway protection devices: after the three I-shaped steel frames are installed, the guard plate (3) is placed behind the legs of the three I-shaped steel frames (7), the hole grooves (8) in the guard plate (3) correspond to the legs of the three I-shaped steel frames (7) one by one, the anchor cable (1) penetrates through the anchor cable holes (9) of the guard plate (3), then the I-shaped steel buckles (2) are installed on the guard plate (3) through the screw connecting pieces (4) and the screws (6), the three I-shaped steel frames (7) and the guard plate (3) are ensured to form a whole, finally the lockset (5) of the anchor cable (1) is installed, and pretightening force is applied to the anchor cable (1).
2. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the fourth step is followed by the following steps: step five: and assembling a plurality of groups of active and passive combined roadway protection devices according to the first to fourth steps to form roadway surrounding rocks.
3. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the process of erecting the I-steel in the step two is as follows: the I-shaped steel is regular and powerful in posture, the phenomena of empty roof, empty side and empty shoulder pit are avoided, the joints between the I-shaped steel legs and the cross beams are tightly jointed, and if the joints are not matched, the gradient and the direction of the I-shaped steel legs are adjusted.
4. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: in the third step, the error of the drilling angle is less than or equal to 6 degrees.
5. the control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: in the fourth step, the I-shaped steel buckle (2) is matched with the guard plate (3), and the I-shaped steel buckle (2) is additionally provided with the anti-friction gasket through the screw connecting piece (4) and is tightly connected with the guard plate (3).
6. the control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the hole groove (8) is oval.
7. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the anchor cable holes (9) are oval.
8. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the connecting holes are round holes matched with the screw connecting pieces (4) and the screws (6).
9. the control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the single group of active and passive combined roadway protection device comprises 3 protection plates (3), and the protection plates (3) are respectively arranged on the top surface and the two side surfaces of the three I-shaped steel supports (7) in a penetrating mode.
10. The control method of the surrounding rock of the supporting roof coal roadway of the large-dip-angle soft and thick coal seam according to claim 1, characterized by comprising the following steps of: the guard plate (3) is perpendicular to the I-shaped steel bracket (7) and the anchor cable (1).
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| CN201910774724.4A CN110566242A (en) | 2019-08-21 | 2019-08-21 | control method for surrounding rock of top coal roadway of large-inclination soft thick coal seam |
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| CN201910774724.4A CN110566242A (en) | 2019-08-21 | 2019-08-21 | control method for surrounding rock of top coal roadway of large-inclination soft thick coal seam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520158A (en) * | 2020-04-28 | 2020-08-11 | 烟台黄金职业学院 | Inclined coal seam fully-mechanized coal mining face roadway combined supporting system and supporting method thereof |
| CN117266894A (en) * | 2023-09-27 | 2023-12-22 | 河南龙宇能源股份有限公司 | Advanced active supporting device for overfire diagenetic recovery of coal face |
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