CN111997657A - Fixed bottom angle arc-shaped frame for coal mine stoping roadway bottom plate and mounting method thereof - Google Patents
Fixed bottom angle arc-shaped frame for coal mine stoping roadway bottom plate and mounting method thereof Download PDFInfo
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- CN111997657A CN111997657A CN202010772707.XA CN202010772707A CN111997657A CN 111997657 A CN111997657 A CN 111997657A CN 202010772707 A CN202010772707 A CN 202010772707A CN 111997657 A CN111997657 A CN 111997657A
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- 239000003245 coal Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011435 rock Substances 0.000 claims abstract description 33
- 238000009434 installation Methods 0.000 claims abstract description 18
- 238000004873 anchoring Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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
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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
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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
- E21D11/183—Supporting means for arch members, not provided for in E21D11/22
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
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- Civil Engineering (AREA)
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Abstract
The embodiment of the invention provides a fixed base angle arc-shaped frame for a coal mine stoping roadway bottom plate and an installation method thereof. The fixed base angle arc frame comprises a pair of base angle fixed oblique blocks, a circular diameter arc pipe and a base angle fixed anchor rod, wherein the base angle fixed oblique blocks are mutually oppositely separated and arranged in a roadway bottom plate, the circular diameter arc pipe is connected in a pair of the base angle fixed oblique blocks, the base angle fixed anchor rod is installed at each of the base angle fixed oblique blocks, and the base angle fixed oblique blocks are externally extended and anchored in a coal rock body. The fixed bottom angle arc-shaped frame for the coal mine stoping roadway floor and the installation method thereof provided by the embodiment of the invention can be used for overcoming the problems that an anchor rod, an inverted bottom arch frame and the like are easy to separate and bulge, complex to process, high in installation difficulty and high in economic cost in the traditional stable control of the floor.
Description
Technical Field
The invention relates to the technical field of coal mine stoping, in particular to a fixed base angle arc-shaped frame for a coal mine stoping roadway bottom plate and an installation method thereof.
Background
A mine tunnel, in particular to a stoping tunnel, is an underground passage for ensuring the safe and efficient mining of a coal mine, and whether surrounding rocks are stable or not is closely related to the safe and efficient mining of the coal mine. Along with the continuous increase of coal mining depth intensity, geological environment is more complicated and changeable, tunnel country rock deformation destruction increases gradually, and wherein the bottom plate is one of the most typical characteristics of heaving seriously.
The tunnel bottom plate bulging refers to the phenomenon that under the influence of excavation engineering, the coal rock mass of the tunnel bottom plate bulges towards the inner space of the tunnel. The roadway section is reduced, transportation and pedestrians are blocked, and mine ventilation is blocked, so that lots of mines have to invest a large amount of manpower and material resources to perform temporary processing work such as 'bottom digging', the whole roadway is scrapped seriously, and the production and safety of the mines are greatly restricted.
For a long time, a great deal of research work is carried out on the floor heave mechanism and the floor heave control technology of a coal mine roadway by a plurality of expert scholars at home and abroad, and a plurality of floor heave control technologies are provided. Researches show that the factors causing roadway floor heave are many, and the prominent factors are the properties of a bottom plate rock stratum, the stress of surrounding rocks, the water physical effect, the earth temperature and the like. Methods of controlling the base drum are broadly classified into two types: one is prevention, that is, measures are taken to reduce the amount of the under-drum to the allowable range; and secondly, removing the floor heave, removing part of rocks of the roadway with the floor heave, and recovering the cross section area of the roadway.
At present, a roadway bottom plate, particularly a mining roadway bottom plate, is usually in a non-supporting state, and additionally, the floor heave control construction difficulty is high, so that the floor heave removal method is the most common application method. There are two main problems with the removal of the floor drum: one is to cure the symptoms and not the root causes, the cleaning only plays a role for a while, and the bottom plate bulges again at the later stage, so the bottom plate has to be cleaned repeatedly. Secondly, the investment of great manpower and the labor intensity are great, which leads to the great increase of the maintenance cost of the roadway.
The method is more common in preventing the four types of the middle and bottom plate anchor rods, the bottom plate grouting, the explosive pot blasting and the closed type support. The setting up of bottom plate stock needs to evaluate bottom plate rock stratum lithology in advance, and broken bottom plate is beaten the stock and usually is not good effect, because the stock perpendicular to bottom plate is beaten the condition that appears the stock along with whole bulging of bottom plate country rock mass easily. The selection of the slurry for the bottom plate grouting is a very exquisite problem, the grouting process is complex and high in cost, and the treatment difficulty is high. Pot blasting is of minimal use due to the poor single effect and the blasting involved. Closed stents work best, but are too expensive for short-cycle applications in stoping roadways, too complex procedures and less applicable.
Disclosure of Invention
The embodiment of the invention provides a fixed bottom angle arc-shaped frame for a coal mine stoping roadway bottom plate and an installation method thereof, which are used for solving the problems that an anchor rod, an inverted bottom arch frame and the like are easy to separate and bulge, complex to process, high in installation difficulty and high in economic cost in the conventional stable control of the bottom plate.
According to a first aspect of the embodiment of the invention, a fixed base angle arc-shaped frame for a coal mine stoping roadway floor is provided, and comprises a pair of base angle fixed inclined blocks, a circular diameter arc-shaped pipe and a base angle fixed anchor rod, wherein the pair of base angle fixed inclined blocks are spaced from each other and arranged in the roadway floor, the circular diameter arc-shaped pipe is connected between the pair of base angle fixed inclined blocks, and the base angle fixed anchor rod is installed on each base angle fixed inclined block and extends outwards to be anchored in a coal rock mass.
According to an embodiment of the invention, the pipe is a continuously curved pipe and protrudes in the roadway floor in a direction away from the roadway above the roadway floor.
According to an embodiment of the invention, each of the bottom corner fixing ramps comprises a first side and a second side opposite to each other, wherein the circular diameter arc tube is mounted on the first side and the bottom corner fixing anchor is anchored in the coal rock mass extending outwardly from the second side.
According to the embodiment of the invention, the first side surface is provided as an inclined surface and the second side surface is provided as a vertical surface, wherein the distance between the first side surface and the second side surface is gradually increased from the top to the bottom of the bottom corner fixing sloping block along the height direction of the bottom corner fixing sloping block.
According to an embodiment of the present invention, each of the bottom angle fixing swash blocks is formed with a mounting hole and an anchor hole, the mounting hole being located above the anchor hole, wherein the circular diameter arc tube is installed in the mounting hole, and the bottom angle fixing anchor is installed in the anchor hole by an anchoring agent.
According to the embodiment of the invention, the first end of the bottom corner fixing anchor rod is anchored in the coal rock mass, the second end of the bottom corner fixing anchor rod is exposed out of the first side surface of the bottom corner fixing sloping block, and the second end of the bottom corner fixing anchor rod is sequentially provided with the self-aligning ball pad and the fastener.
According to the embodiment of the invention, the bottom angle fixing anchor rod is a threaded rod, and the fastening piece is a nut which is in threaded connection with the threaded rod.
According to an embodiment of the present invention, the bottom-angle fixing anchor is a straight rod member, and the bottom-angle fixing anchor is inclined obliquely downward with respect to a horizontal direction and anchored in the coal rock body.
According to the embodiment of the invention, the fixed base angle arc-shaped frame further comprises a concrete layer filled in the roadway bottom plate, and the concrete layer coats the pair of base angle fixed oblique blocks and the circular-diameter arc-shaped pipe.
According to a second aspect of the embodiments of the present invention, there is provided an installation method of the fixed bottom corner arc-shaped frame as described above, including: a foundation pit conforming to the appearance of the fixed bottom angle arc-shaped frame is arranged in the roadway bottom plate; placing the bottom corner fixing inclined blocks into foundation pits at two ends of a roadway bottom plate, and attaching the vertical surfaces of the bottom corner fixing inclined blocks to roadway surrounding rocks; aligning a drill rod to the base angle fixing inclined block, obliquely drilling an anchor rod hole downwards, after the anchor rod hole is drilled, filling an anchoring agent into the anchor rod hole, anchoring the anchor rod hole with a base angle fixing anchor rod, and then sleeving an aligning ball pad into an exposed section of the base angle fixing anchor rod and screwing a nut to apply pre-tightening force; repeating the step of installing the bottom angle fixing anchor rod, and finishing the installation of the bottom angle fixing anchor rod on the other side; placing the circular-diameter arc-shaped pipe into a foundation pit, aligning and inserting two ends of the circular-diameter arc-shaped pipe into the mounting holes of the bottom corner fixing inclined blocks, and placing stably; and uniformly spraying concrete into the foundation pit, and stirring while spraying until the concrete uniformly fills the whole foundation pit so as to uniformly wrap the fixed bottom angle arc-shaped frame.
In the fixed base angle arc-shaped frame for the coal mine stoping roadway bottom plate and the installation method thereof provided by the embodiment of the invention, a pair of base angle fixed inclined blocks are oppositely spaced and arranged in the roadway bottom plate, the circular-diameter arc-shaped pipe is connected between the pair of base angle fixed inclined blocks, and the base angle fixed anchor rod is installed on each base angle fixed inclined block and extends outwards to be anchored in a coal rock mass. When the tunnel bottom plate is extruded by horizontal stress, the bottom angle fixing inclined block can be firstly contacted with two sides of surrounding rocks to transmit the horizontal stress to the circular-diameter arc-shaped pipe, the circular-diameter arc-shaped pipe has good bearing performance and bears the horizontal extrusion, and the arc design of the circular-diameter arc-shaped pipe can effectively resist the extrusion force of the upward bulge of the bottom plate and limit the bulge of the bottom plate. The bottom corner fixing anchor rod fixes the whole support in the deep stable rock stratum of the coal side by means of the length of the bottom corner fixing anchor rod, and the possibility that the support is integrally extruded upwards is avoided. Meanwhile, the bottom corner fixing anchor rod can limit the horizontal extrusion of the coal slope to the interior of the roadway by means of high rigidity of the bottom corner fixing anchor rod. Therefore, the fixed bottom corner arc-shaped frame provided by the embodiment of the invention has high strength and high bending resistance, and can strongly resist the effects of horizontal extrusion and vertical extrusion.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of one embodiment of a fixed base angle arc of the present invention;
FIG. 2 is an enlarged view of area A in the embodiment of FIG. 1;
FIG. 3 is an assembled view of the bottom corner fixing ramp and the circular diameter arc tube;
FIG. 4 is an assembled perspective view of the bottom corner anchor, self-aligning ball washer and nut;
fig. 5 is a schematic view of the field construction installation of the fixed base angle arc of the present invention.
Reference numerals:
100: fixing a bottom angle arc-shaped frame; 102: a bottom corner fixing oblique block; 104: a circular diameter arc pipe; 106: fixing an anchor rod at a bottom corner; 108: a first side surface; 110: a second side surface; 112: mounting holes; 114: an anchor rod hole; 116 aligning the ball pad; 118: a fastener; 120: and a concrete layer.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Referring now to fig. 1 to 5, a fixed bottom corner arc frame for a coal mine stoping roadway floor according to an embodiment of the present invention will be described. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a fixed bottom angle arc 100 for a coal mine stoping roadway floor. The fixed base angle arced frame 100 includes a pair of base angle fixed ramps 102, a circular diameter arced tube 104, and a base angle fixed anchor 106.
Specifically, a pair of bottom corner fixing ramps 102 are spaced apart from each other and disposed in the roadway floor, a circular diameter arced tube 104 is connected between the pair of bottom corner fixing ramps 102, and a bottom corner fixing anchor 106 is mounted on each bottom corner fixing ramp 102 and extends outwardly to be anchored in the coal rock mass.
In a specific application process, when a roadway floor is extruded by horizontal stress, the bottom corner fixing inclined block 102 firstly contacts with surrounding rocks on two sides to transmit the horizontal stress to the circular-diameter arc-shaped pipe 104, the circular-diameter arc-shaped pipe 104 has good pressure bearing performance and bears the horizontal extrusion, and the arc design of the circular-diameter arc-shaped pipe 104 can effectively resist the extrusion force of the upward bulge of the floor and limit the bulge of the floor. The bottom corner fixing anchor rod 106 fixes the whole support in a stable rock stratum in the deep part of the coal side by means of the length of the bottom corner fixing anchor rod, and the possibility that the support is integrally extruded upwards is avoided. Meanwhile, the bottom corner fixing anchor rods 106 can limit horizontal extrusion of the coal slope to the interior of the roadway by means of high rigidity of the bottom corner fixing anchor rods. Therefore, the fixed bottom corner arc-shaped frame provided by the embodiment of the invention has high strength and high bending resistance, and can strongly resist the effects of horizontal extrusion and vertical extrusion.
In one embodiment, as shown in figure 1 in conjunction with figure 5, the circular diameter arced tube 104 is a continuously curved arced tube. In other words, the radii of curvature of the circular diameter arced tube 104 are equal everywhere. More specifically, the circular diameter arced tubes 104 project in the roadway floor in a direction away from the roadway above the roadway floor. That is, the projecting direction of the pipe 104 is opposite to the upward bulge direction of the base plate, so the arc design of the pipe 104 can effectively resist the upward bulge extrusion force of the base plate and limit the bulge.
Further, in one embodiment, as shown in fig. 1 and 2, each bottom corner fixing ramp 102 includes a first side 108 and a second side 110 opposite each other. Specifically, the circular diameter arced tube 104 is mounted on a first side 108 and the bottom angle anchor 106 extends outwardly from a second side 110 for anchoring in the coal rock mass. In one embodiment, the first side 108 is configured as an inclined surface and the second side 110 is configured as a vertical surface, as shown in fig. 1, 2, and 5. Wherein, along the height direction of the bottom corner fixing swash block 102, the distance between the first side surface 108 and the second side surface 110 of the bottom corner fixing swash block 102 becomes gradually larger from the top to the bottom of the bottom corner fixing swash block 102, thereby forming a substantially tapered structure.
With continued reference to fig. 2 and 3, in one embodiment of the invention, each bottom angle fixation swash block 102 is formed with a mounting hole 112 and an anchor rod hole 114, and the mounting hole 112 is located above the anchor rod hole 114. During assembly, the circular diameter arced tube 104 is installed in the mounting hole 112 and the bottom angle fixation anchor 106 is installed in the anchor hole 114 with an anchoring agent. In one embodiment, the mounting holes 112 may be, for example, circular holes that mate with the circular diameter arced tubes 104; it should be understood, of course, that the shape of the mounting hole 112 may match the shape of the circular diameter arced tube 104, and that a circular hole is only one embodiment of the present invention and is not intended to limit the invention in any way.
With continued reference to fig. 1, 2 and in conjunction with fig. 4, in one embodiment of the present invention, a first end of the bottom angle anchor 106 is anchored in the coal rock mass and a second end of the bottom angle anchor 106 is exposed by the first side 108 of the bottom angle anchor ramp 102. As shown in fig. 4, a self-aligning ball pad 116 and a fastener 118 are sequentially mounted on the second end of the bottom corner fixing anchor 106. For example, in one embodiment, the bottom angle fixation bolt 106 may be a threaded rod and the fastener 118 may be a nut that is threaded onto the threaded rod. It will of course be appreciated that the form of the bottom angle anchor 106 and fastener 118 are illustrative and may be used as appropriate and the invention is not limited thereto.
With continued reference to fig. 1 in conjunction with fig. 5, in one embodiment of the present invention, the bottom angle fixing anchor 106 is a straight rod member, and the bottom angle fixing anchor 106 is inclined obliquely downward with respect to the horizontal direction and anchored in the coal rock mass. In other words, when the bottom-angle fixation bolt 106 is completely assembled, it is disposed to extend obliquely downward. According to the above embodiment, the inclined bottom angle fixing anchor 106 fixes the whole support in the deep stable rock stratum of the coal side by means of the length of the inclined bottom angle fixing anchor, and the possibility that the support is extruded upwards integrally is avoided. Meanwhile, the inclined bottom corner fixing anchor rods 106 can limit horizontal extrusion of the coal slope to the interior of the roadway by means of high rigidity of the inclined bottom corner fixing anchor rods.
As further shown in fig. 5, in one embodiment of the present invention, the fixed-base angle arced frame 100 further includes a concrete layer 120 filled in the roadway floor, the concrete layer 120 encasing the pair of base angle fixing ramps 102 and the circular diameter arced tube 104 as described above.
On the other hand, the embodiment of the invention also provides an installation method of the fixed bottom corner arc-shaped frame. Specifically, the installation method comprises the following steps:
according to the roadway bottom plate stability control scheme, a foundation pit conforming to the appearance of the fixed base angle arc-shaped frame 100 is formed in the roadway bottom plate;
placing the bottom corner fixing inclined block 102 into foundation pits at two ends of a roadway bottom plate, and attaching the vertical surface of the bottom corner fixing inclined block 102 to roadway surrounding rock;
drilling a drill rod to be aligned with the bottom corner fixing inclined block 102 obliquely downwards to form an anchor rod hole, after the anchor rod hole is drilled, filling an anchoring agent into the anchor rod hole to anchor the anchor rod hole with the bottom corner fixing anchor rod 106, then sleeving the self-aligning ball pad 116 on the exposed section of the bottom corner fixing anchor rod 106, and screwing a fastener 118 (such as a nut) to apply pre-tightening force;
repeating the step of installing the bottom angle fixing anchor rod 106, and finishing the installation of the bottom angle fixing anchor rod 106 on the other side;
placing the circular-diameter arc-shaped pipe 104 into a foundation pit, aligning and inserting two ends of the circular-diameter arc-shaped pipe 104 into the mounting hole 112 of the bottom corner fixing inclined block 102, and placing stably;
the concrete is sprayed into the foundation pit uniformly while being stirred until the whole foundation pit is filled with the concrete uniformly to form a concrete layer 120, so that the fixed base angle arc-shaped frame 100 is wrapped therein uniformly.
Further, the installation method may further include the steps of: according to the floor stabilization control scheme, the steps described above are repeated to complete the installation of all of the fixed base angle arcs 100.
In summary, in the fixing base angle arc-shaped frame for the coal mine stoping roadway floor and the installation method thereof provided by the embodiment of the invention, a pair of base angle fixing inclined blocks 102 are oppositely spaced and arranged in the roadway floor, the circular diameter arc-shaped pipe 104 is connected between the pair of base angle fixing inclined blocks 102, and the base angle fixing anchor rods 106 are installed on each base angle fixing inclined block 102 and extend outwards to be anchored in the coal rock mass. When the roadway floor is extruded by horizontal stress, the bottom corner fixing inclined block 102 can firstly contact with two walls of surrounding rocks, the horizontal stress is transmitted to the circular-diameter arc-shaped pipe 104, the circular-diameter arc-shaped pipe 104 has good bearing performance and bears the horizontal extrusion, the arc design of the circular-diameter arc-shaped pipe 104 can effectively resist the extrusion force of the floor which bulges upwards, and the floor is limited to bulge. The bottom corner fixing anchor rod 106 fixes the whole support in a stable rock stratum in the deep part of the coal side by means of the length of the bottom corner fixing anchor rod, and the possibility that the support is integrally extruded upwards is avoided. Meanwhile, the bottom corner fixing anchor rods 106 can limit horizontal extrusion of the coal slope to the interior of the roadway by means of high rigidity of the bottom corner fixing anchor rods. Therefore, the fixed bottom corner arc-shaped frame provided by the embodiment of the invention has high strength and high bending resistance, and can strongly resist the effects of horizontal extrusion and vertical extrusion.
In addition, the fixed base angle arc-shaped frame 100 is simple in design, low in price, easy to manufacture and convenient to install, raw materials are all derived from waste steel in the coal mine production process, and can be rapidly processed on a coal mine site, so that the bottom plate bulge of a coal mine roadway (particularly a stoping roadway) is effectively controlled. Therefore, the fixed base angle arc frame 100 provided by the embodiment of the invention overcomes the problems that the anchor rod, the inverted base arch frame and the like are easy to separate and bulge, complex to process, difficult to install and high in economic cost in the conventional stable control of the bottom plate.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A fixed base angle arc frame for a coal mine stoping roadway floor is characterized by comprising a pair of base angle fixed oblique blocks, a circular diameter arc tube and a base angle fixed anchor rod,
wherein, it is a pair of the fixed sloping block of base angle separates and sets up in the tunnel bottom plate relatively each other, circle footpath arc pipe connection is a pair of between the fixed sloping block of base angle, the fixed stock of base angle is installed every on the fixed sloping block of base angle and outside extension anchor in the coal rock mass.
2. The fixed base angle arc of claim 1 wherein the pipe is a continuously curved pipe and projects in the roadway floor in a direction away from the roadway above the roadway floor.
3. The fixed bottom corner arc according to claim 1 or 2 wherein each of the bottom corner fixing ramps comprises a first side and a second side opposite each other,
wherein the circular diameter arc tube is mounted on the first side surface, and the bottom corner fixing anchor rod is anchored in the coal rock mass by extending the second side surface outwards.
4. The fixed bottom corner arc according to claim 3 wherein the first side is provided as an inclined surface and the second side is provided as a vertical surface,
the distance between the first side surface and the second side surface is gradually increased from the top to the bottom of the bottom corner fixing inclined block along the height direction of the bottom corner fixing inclined block.
5. The fixed base angle arc of claim 3 wherein each of the base angle fixing ramps has a mounting hole and an anchor rod hole formed therein, the mounting hole being located above the anchor rod hole,
wherein the circular diameter arc tube is installed in the installation hole, and the bottom angle fixing anchor is installed in the anchor hole by an anchoring agent.
6. The fixed base angle arc stand of claim 5 wherein a first end of the base angle anchor is anchored in the coal rock mass and a second end is exposed from the first side of the base angle fixed swash block and wherein a self-aligning ball pad and a fastener are sequentially mounted on the second end of the base angle anchor.
7. The fixed base angle arc of claim 6 wherein the base angle anchor is a threaded rod and the fastener is a nut threaded onto the threaded rod.
8. The fixed floor angle arc according to claim 1 or 2, wherein the floor angle fixing anchor is a straight bar member, and the floor angle fixing anchor is inclined obliquely downward with respect to a horizontal direction and anchored in the coal rock mass.
9. The fixed base angle arc frame according to claim 1 or 2, further comprising a concrete layer filled in the roadway floor, the concrete layer covering a pair of the base angle fixed swash blocks and the circular diameter arc tube.
10. A method of mounting a fixed base angle bracket as claimed in any one of claims 1 to 9, comprising:
a foundation pit conforming to the appearance of the fixed bottom angle arc-shaped frame is arranged in the roadway bottom plate;
placing the bottom corner fixing inclined blocks into foundation pits at two ends of a roadway bottom plate, and attaching the vertical surfaces of the bottom corner fixing inclined blocks to roadway surrounding rocks;
aligning a drill rod to the base angle fixing inclined block, obliquely drilling an anchor rod hole downwards, after the anchor rod hole is drilled, filling an anchoring agent into the anchor rod hole, anchoring the anchor rod hole with a base angle fixing anchor rod, and then sleeving an aligning ball pad into an exposed section of the base angle fixing anchor rod and screwing a nut to apply pre-tightening force;
repeating the step of installing the bottom angle fixing anchor rod, and finishing the installation of the bottom angle fixing anchor rod on the other side;
placing the circular-diameter arc-shaped pipe into a foundation pit, aligning and inserting two ends of the circular-diameter arc-shaped pipe into the mounting holes of the bottom corner fixing inclined blocks, and placing stably;
and uniformly spraying concrete into the foundation pit, and stirring while spraying until the concrete uniformly fills the whole foundation pit so as to uniformly wrap the fixed bottom angle arc-shaped frame.
Priority Applications (1)
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| CN202010772707.XA CN111997657A (en) | 2020-08-04 | 2020-08-04 | Fixed bottom angle arc-shaped frame for coal mine stoping roadway bottom plate and mounting method thereof |
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| CN202010772707.XA CN111997657A (en) | 2020-08-04 | 2020-08-04 | Fixed bottom angle arc-shaped frame for coal mine stoping roadway bottom plate and mounting method thereof |
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| CN111997657A true CN111997657A (en) | 2020-11-27 |
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