CN112983490A - Novel I-steel lateral pressure-resistant shed leg and supporting system suitable for gob-side entry retaining - Google Patents
Novel I-steel lateral pressure-resistant shed leg and supporting system suitable for gob-side entry retaining Download PDFInfo
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- CN112983490A CN112983490A CN201911286972.0A CN201911286972A CN112983490A CN 112983490 A CN112983490 A CN 112983490A CN 201911286972 A CN201911286972 A CN 201911286972A CN 112983490 A CN112983490 A CN 112983490A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention relates to a novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining, which comprises a shed leg body, wherein a lateral pressure resisting mechanism is arranged on one side of the shed leg body, so that the phenomenon that the shed leg loses a supporting effect due to excessive deformation caused by lateral pressure is avoided, the shed leg body comprises a vertical support, a fork is arranged at the top end of the vertical support, and a lower baffle is arranged at the bottom end of the vertical support. The invention also provides a supporting system. The invention has the following beneficial effects: the measure of anti side pressure has been increased, and anti side pressure stable in structure is effective, and simple structure, and the implementation of being convenient for is reformed transform, changes the problem that the anti side pressure of present market product is not enough. After the novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining is used, the relative change of the section of the tunnel is small, the side part and the shed leg are basically not deformed, the maintenance workload and the material consumption are reduced, and the safety is high.
Description
Technical Field
The invention relates to a novel I-steel lateral pressure resisting shed leg and a supporting system suitable for gob-side entry retaining, and belongs to the technical field of roadway supporting.
Background
Because the existing mining areas in China have coal pillars reserved every year, a large amount of coal resources are wasted, and therefore all the mining areas are subjected to gob-side entry retaining engineering, and the phenomenon of coal resource waste can be reduced or even avoided.
After the shed legs are replaced along the gob-side entry cut at the top of the coal seam, the shed legs are affected by lateral pressure, and the problem of bending deformation is easy to occur. After the shed legs deform, the section of the roadway becomes small, the top plate sinks, the bulging is serious, the supporting strength is reduced, the safety is reduced, and the shed legs need to be replaced in time. But the problems of high labor intensity, increased material cost and potential safety hazard exist when replacing new shed legs. The novel I-steel lateral pressure-resistant shed leg and supporting system suitable for the gob-side entry retaining is urgently needed, and the problem that the shed leg is easy to bend and deform after the shed leg is replaced in the coal seam roof cutting gob-side entry retaining is solved.
Disclosure of Invention
According to the defects in the prior art, the technical problems to be solved by the invention are as follows: in order to solve one of the problems, a novel I-steel lateral pressure resisting shed leg and a supporting system suitable for gob-side entry retaining are provided.
In order to solve one of the problems, the invention provides a novel I-steel lateral pressure resistant shed leg suitable for gob-side entry retaining, which is characterized in that: including the canopy leg body, one side of canopy leg body is provided with anti side pressure mechanism, avoids the canopy leg to press because of the side and lead to excessive deformation to lose the effect of strutting, the canopy leg body includes vertically to supporting vertically be provided with the fork to the top of supporting vertically be provided with down the baffle to the bottom of supporting. The measure of anti side pressure has been increased, and anti side pressure stable in structure is effective, and simple structure, and the implementation of being convenient for is reformed transform, changes the problem that the anti side pressure of present market product is not enough.
Preferably, the lateral pressure resisting mechanism is provided with at least one stressed inclined plane. The lateral pressure in the horizontal direction acts on the stress inclined plane of the lateral pressure resisting mechanism, and the vertical force of the top plate and the bottom plate, which is changed from the lateral pressure direction to be vertical, directly acts on the top and the bottom of the shed leg, so that the horizontal acting force of the lateral pressure on the shed leg is reduced, the transverse load is changed into the radial load, and the integral bearing capacity is greatly improved; or the lateral pressure force in the horizontal direction acts on the stress inclined plane of the lateral pressure resisting mechanism, and the stress point of the shed leg is transferred to the upper part and/or the lower part of the shed leg from the middle part of the shed leg through the lateral pressure resisting mechanism, so that the excessive deformation caused by the stress of the middle part is avoided.
Preferably, let the pressure mechanism including the branch power prop, dog and last dog, go up the dog welding and support the upper portion of outer wall vertically to, the dog welding is vertical to the lower part that supports the outer wall down, the I-steel branch power props to be V type structure, has two atress inclined planes, the opening orientation that the I-steel branch power propped is vertical to supporting, the I-steel branch power props has two landing legs, the tip of two landing legs supports the butt respectively on dog and last dog down. The lateral pressure force in the horizontal direction acts on the stress inclined plane of the lateral pressure resisting mechanism, the direction of the lateral pressure is changed into the vertical force perpendicular to the top plate and the bottom plate, and the vertical force directly acts on the top and the bottom of the shed leg, so that the horizontal acting force of the lateral pressure on the shed leg is reduced, the transverse load is changed into the radial load, and the integral bearing capacity is greatly improved.
Preferably, a back plate frame is further arranged on the back of the force-dividing support. And the back plate frame is utilized to adjust the gap between the roadway and the shed legs, so that the position of the force-dividing support is stabilized.
Preferably, the vertical support is formed by processing U-shaped steel, steel rails, I-shaped steel or section steel, when the vertical support is made of the I-shaped steel, the lower stop block and the upper stop block are both welded on the same side wing plate of the vertical support, and the lower stop block and the upper stop block are both made of the U-shaped steel, the steel rails, the I-shaped steel or the section steel. The I-steel is a common material in roadway support, is an economical section steel with better section mechanical property, and has the advantages of high utilization rate, convenient material acquisition and low use cost in the current life.
Preferably, the I-steel component force support is formed by bending U-shaped steel, steel rails, I-steel or section steel. The bending machine is adopted for bending, the processing is convenient, and the processed workpiece has good comprehensive mechanical properties.
Preferably, the bending angle of the force-dividing support is an obtuse angle which is greater than 90 degrees and smaller than 180 degrees. The total length of the force-dividing support is shortened, which is equivalent to the reduction of the use amount of steel.
Preferably, the pressure yielding mechanism comprises a force-dividing support, a lower stop block and an upper stop block, the upper stop block is welded to the upper portion of the outer wall which is vertically supported, the lower stop block is welded to the lower portion of the outer wall which is vertically supported, the I-steel force-dividing support is of a V-shaped structure and is provided with two stress inclined planes and a plane, an opening of the I-steel force-dividing support faces the vertical direction support, the I-steel force-dividing support is provided with two support legs, and the end portions of the two support legs are respectively welded to the lower stop block and the upper stop block. The horizontal side pressure force acts on the stress inclined plane of the anti-side pressure mechanism, and the stress point of the shed leg is transferred to the upper part and the lower part of the shed leg from the middle part of the shed leg through the anti-side pressure mechanism.
Preferably, the manufacturing method of the force-dividing support comprises the following steps:
step 1: rust cleaning: after I-shaped steel to be processed is selected, a steel wire brush is used for manual derusting;
step 2: and (3) measurement calculation: calculating the scale required by bending the whole I-steel according to the bending angle of the I-steel, measuring the size and length of the required I-steel, and cutting the I-steel by using a cutting machine;
and step 3: installing a die: installing a bending die on a hydraulic bending machine, turning on a power supply of the hydraulic bending machine, and then starting hydraulic pressure;
and 4, step 4: angle adjustment: marking a positioning line on the bending die, and adding a limiting block according to the bending angle after the bending angle is set;
and 5: marking: marking and determining the position of the I-shaped steel needing to be bent by using a marking pen;
step 6: and (3) lubricating treatment: cleaning the bending die, and then smearing a lubricant on the bent part of the bending die;
and 7: bending treatment: placing the I-steel alignment positioning line in a bending die, clamping, and then starting a hydraulic bending machine to bend;
and 8: taking materials: and taking the bent I-steel out of the hydraulic bending machine, and visually checking whether the bent I-steel has obvious wrinkles, wherein if the bent I-steel does not have obvious wrinkles, the bent I-steel is qualified, and the bending process of the force-sharing support is completed. The design structure is simple, the machining process is the same as that of a common support for a coal mine, and the existing equipment of an ore machine enterprise can be fully utilized for production.
In order to solve the second problem, the invention also provides a supporting system which comprises the novel I-steel lateral pressure resistant shed leg and the beam suitable for gob-side entry retaining, wherein the shed leg and the beam use 11# mining I-steel, 12# common channel steel is adopted as a buckle, every two rows of shed legs are connected by a pull rod, and the pull rod uses 20# round steel.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining, the lateral pressure resisting mechanism is arranged on one side of the shed leg body, so that the shed leg is prevented from being excessively deformed due to lateral pressure and losing a supporting effect, the shed leg body comprises the vertical support, the top end of the vertical support is provided with the fork, and the bottom end of the vertical support is provided with the lower baffle. The measure of anti side pressure has been increased, and anti side pressure stable in structure is effective, and simple structure, and the implementation of being convenient for is reformed transform, changes the problem that the anti side pressure of present market product is not enough.
2. According to the novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining, the I-steel force-dividing support is of a V-shaped structure and is provided with two stress inclined planes, the opening of the I-steel force-dividing support faces the vertical direction, the I-steel force-dividing support is provided with two support legs, the end parts of the two support legs are respectively abutted against the lower stop block and the upper stop block, the lateral pressure in the horizontal direction acts on the stress inclined planes of the lateral pressure resisting mechanism, the direction of the lateral pressure is changed into the direction perpendicular to the vertical force of the top bottom plate and directly acts on the top and the bottom of the shed leg, so that the horizontal acting force of the lateral pressure on the shed leg is reduced, the lateral load is changed into the radial load, and the integral bearing.
3. According to the novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining, the I-steel force-dividing support is of a V-shaped structure and is provided with two stress inclined planes and a plane, the opening of the I-steel force-dividing support faces the vertical direction, the I-steel force-dividing support is provided with two supporting legs, the end parts of the two supporting legs are respectively welded on the lower stop block and the upper stop block, the lateral pressure in the horizontal direction acts on the stress inclined planes of the lateral pressure resisting mechanism, the stress point of the shed leg is transferred to the upper part and/or the lower part of the shed leg from the middle part of the shed leg through the lateral pressure resisting mechanism, and excessive deformation caused by stress of the middle part is avoided.
4. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining is made of I-steel, the I-steel is a common material in roadway support, is an economical section steel with better section mechanical property, and has the advantages of high utilization rate, convenient material taking and low use cost in the current life.
5. According to the novel I-shaped steel lateral pressure resisting shed leg suitable for gob-side entry retaining, the bending angle of the force dividing support is an obtuse angle which is larger than 90 degrees and smaller than 180 degrees, the total length of the force dividing support is shortened, and the using amount of steel is reduced equivalently.
6. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining is characterized in that the I-steel force-dividing support is formed by bending U-shaped steel, steel rails, I-shaped steel or shaped steel. The bending machine is adopted for bending, the processing is convenient, and the processed workpiece has good comprehensive mechanical properties.
7. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining is simple in design structure, the processing technology is the same as that of a common coal mine support, and existing equipment of an ore machine enterprise can be fully utilized for production.
8. After the novel I-steel lateral pressure-resistant shed leg suitable for gob-side entry retaining is used, the supporting system has the advantages that the relative change of the section of the roadway is small, the side part and the shed leg are basically not deformed, the maintenance workload and the material consumption are reduced, and the safety is high.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
in the figure: 1. vertical support 2, component force support 3, fork 4, back plate frame 5, lower baffle 6, lower baffle 7, last baffle.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Example one
As shown in fig. 1, be suitable for novel I-steel lateral compression resistance canopy leg of gob entry, including canopy leg body, one side of canopy leg body is provided with anti lateral compression mechanism, avoids the canopy leg to lead to excessive deformation to lose the supporting role because of the side pressure, canopy leg body is including vertical to supporting 1's top is provided with fork 3 vertical to supporting 1's bottom is provided with down baffle 6, has increased the measure of anti lateral compression, and anti lateral compression stable in structure is effective, and simple structure, and the implementation of being convenient for is reformed transform, changes the not enough problem of anti lateral compression of present market product.
In the embodiment, the lateral pressure resisting mechanism is at least provided with one stress inclined plane, the lateral pressure in the horizontal direction acts on the stress inclined plane of the lateral pressure resisting mechanism, and the direction of the lateral pressure is changed into the direction vertical to the top and bottom plates, so that the vertical force directly acts on the top and bottom of the shed leg, the horizontal acting force of the lateral pressure on the shed leg is reduced, the transverse load is changed into the radial load, and the integral bearing capacity is greatly improved; or the lateral pressure force in the horizontal direction acts on the stress inclined plane of the anti-lateral pressure mechanism, and the stress point of the shed leg is transferred to the upper part and/or the lower part of the shed leg from the middle part of the shed leg through the anti-lateral pressure mechanism; the pressure yielding mechanism comprises a force-dividing support 2, a lower stop block 5 and an upper stop block 7, the upper stop block 7 is welded on the upper part of the outer wall of a vertical support 1, the lower stop block 5 is welded on the lower part of the outer wall of the vertical support 1, the I-steel force-dividing support 2 is of a V-shaped structure and is provided with two stress inclined planes, the opening of the I-steel force-dividing support 2 faces the vertical support 1, the I-steel force-dividing support 2 is provided with two support legs, the end parts of the two support legs are respectively abutted against the lower stop block 5 and the upper stop block 7, the horizontal side pressure acts on the stress inclined plane of the lateral pressure resisting mechanism, the lateral pressure direction is changed into the vertical force perpendicular to the top bottom plate and directly acts on the top and the bottom of the shed legs, so that the horizontal acting force of the lateral pressure on the shed legs is reduced, the transverse load is changed into; the back of the force-dividing support 2 is also provided with a back plate frame 4, and the back plate frame 4 is used for adjusting the gap between the roadway and the shed legs and stabilizing the position of the force-dividing support 2; the vertical support 1 is formed by processing I-steel, when the vertical support 1 is made of the I-steel, the lower stop block 5 and the upper stop block 7 are both welded on the same side wing plate of the vertical support 1, the lower stop block 5 and the upper stop block 7 are both made of the I-steel, the I-steel is a common material in roadway support, and is an economical section steel with more excellent section mechanical property, in the current life, the utilization rate is quite high, the material taking is convenient, and the use cost is low; the I-shaped steel force-dividing support 2 is formed by bending I-shaped steel, is bent by a bending machine, is convenient to process, and has good comprehensive mechanical property as well; the bending angle of the force-dividing support 2 is an obtuse angle which is larger than 90 degrees and smaller than 180 degrees, the total length of the force-dividing support 2 is shortened, and the using amount of steel is reduced equivalently.
The manufacturing method of the force-dividing support 2 comprises the following steps: step 1: rust cleaning: after I-shaped steel to be processed is selected, a steel wire brush is used for manual derusting; step 2: and (3) measurement calculation: calculating the scale required by bending the whole I-steel according to the bending angle of the I-steel, measuring the size and length of the required I-steel, and cutting the I-steel by using a cutting machine; and step 3: installing a die: installing a bending die on a hydraulic bending machine, turning on a power supply of the hydraulic bending machine, and then starting hydraulic pressure; and 4, step 4: angle adjustment: marking a positioning line on the bending die, and adding a limiting block according to the bending angle after the bending angle is set; and 5: marking: marking and determining the position of the I-shaped steel needing to be bent by using a marking pen; step 6: and (3) lubricating treatment: cleaning the bending die, and then smearing a lubricant on the bent part of the bending die; and 7: bending treatment: placing the I-steel alignment positioning line in a bending die, clamping, and then starting a hydraulic bending machine to bend; and step 9: taking materials: and taking the bent I-steel out of the hydraulic bending machine, and visually checking whether the bent I-steel has obvious wrinkles, wherein if the bent I-steel does not have obvious wrinkles, the bent I-steel is qualified, and the bending process of the force-sharing support 2 is completed.
Example two
Referring to fig. 2, the difference from the first embodiment is that the yielding mechanism comprises a force-dividing support 2, a lower stop block 5 and an upper stop block 7, the upper stop block 7 is welded on the upper portion of the outer wall of the vertical support 1, the lower stop block 5 is welded on the lower portion of the outer wall of the vertical support 1, the i-steel force-dividing support 2 is of a V-shaped structure and has two stress inclined planes and a plane, an opening of the i-steel force-dividing support 2 faces the vertical support 1, the i-steel force-dividing support 2 has two support legs, the end portions of the two support legs are respectively welded on the lower stop block 5 and the upper stop block 7, the horizontal side pressure force acts on the stress inclined planes of the anti-side pressure mechanism, and the stress point of the shed leg is transferred from the middle portion of the shed leg to the upper portion and the lower portion of the shed leg through the anti.
EXAMPLE III
A supporting system comprises novel I-steel lateral pressure resistant shed legs and cross beams suitable for gob-side entry retaining according to any one of claims 1 to 9, wherein the shed legs and the cross beams are formed by machining 11# mining I-steel, 12# common channel steel is used as a buckle, every two rows of shed legs are connected through a pull rod, and the pull rod is 20# round steel.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. 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 illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a be suitable for novel anti side pressure canopy leg of I-steel of gob entry which characterized in that: including the canopy leg body, one side of canopy leg body is provided with anti side pressure mechanism, avoids the canopy leg to lead to excessive deformation to lose the effect of strutting because of the side pressure, the canopy leg body includes vertically to supporting (1) vertically to being provided with fork (3) on the top of supporting (1) vertically to the bottom of supporting (1) be provided with down baffle (6).
2. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 1, characterized in that: the lateral pressure resisting mechanism is at least provided with a stress inclined plane.
3. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 2, characterized in that: let pressure mechanism prop (2) including dividing the power, dog (5) and last dog (7) down, go up dog (7) welding and support the upper portion of (1) outer wall vertically, dog (5) welding is vertical to the lower part that supports (1) outer wall down, I-steel divides the power to prop (2) and is the V type structure, two atress inclined planes have, the I-steel divides the opening orientation that the power propped (2) to vertical supporting (1), the I-steel divides the power to prop (2) and has two landing legs, the tip of two landing legs is the butt respectively on dog (5) and last dog (7) down.
4. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 3, characterized in that: the back of the force-dividing support (2) is also provided with a back plate frame (4).
5. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 4, characterized in that: the vertical support (1) is formed by processing U-shaped steel, steel rails, I-shaped steel or section steel, when the vertical support (1) is made of the I-shaped steel, the lower stop block (5) and the upper stop block (7) are welded on the same side wing plate of the vertical support (1), and the lower stop block (5) and the upper stop block (7) are made of the U-shaped steel, the steel rails, the I-shaped steel or the section steel.
6. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 5, characterized in that: the I-shaped steel force-dividing support (2) is formed by bending U-shaped steel, steel rails, I-shaped steel or section steel.
7. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 6, characterized in that: the bending angle of the force-dividing support (2) is an obtuse angle which is larger than 90 degrees and smaller than 180 degrees.
8. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to claim 2, characterized in that: let pressure mechanism prop (2) including dividing the power, dog (5) and last dog (7) down, go up dog (7) welding and support the upper portion of (1) outer wall vertically, dog (5) welding is vertical to the lower part that supports (1) outer wall down, I-steel divides the power to prop (2) and is the V type structure, two atress inclined planes and a plane have, I-steel divides the opening orientation that the power propped (2) vertical to supporting (1), I-steel divides the power to prop (2) and has two landing legs, the tip of two landing legs welds respectively on dog (5) and last dog (7) down.
9. The novel I-steel lateral pressure resisting shed leg suitable for gob-side entry retaining according to any one of claims 1 to 7, characterized in that: the manufacturing method of the force-dividing support (2) comprises the following steps:
step 1: rust cleaning: after I-shaped steel to be processed is selected, a steel wire brush is used for manual derusting;
step 2: and (3) measurement calculation: calculating the scale required by bending the whole I-steel according to the bending angle of the I-steel, measuring the size and length of the required I-steel, and cutting the I-steel by using a cutting machine;
and step 3: installing a die: installing a bending die on a hydraulic bending machine, turning on a power supply of the hydraulic bending machine, and then starting hydraulic pressure;
and 4, step 4: angle adjustment: marking a positioning line on the bending die, and adding a limiting block according to the bending angle after the bending angle is set;
and 5: marking: marking and determining the position of the I-shaped steel needing to be bent by using a marking pen;
step 6: and (3) lubricating treatment: cleaning the bending die, and then smearing a lubricant on the bent part of the bending die;
and 7: bending treatment: placing the I-steel alignment positioning line in a bending die, clamping, and then starting a hydraulic bending machine to bend;
and 8: taking materials: and (3) taking the bent I-steel out of the hydraulic bending machine, and visually checking whether the bent I-steel has obvious wrinkles, if not, determining that the bent I-steel is qualified, and thus finishing the bending process of the force-sharing support (2).
10. A support system, characterized by: the novel I-steel lateral pressure resistant shed leg and the novel I-steel lateral pressure resistant beam suitable for gob-side entry retaining according to any one of claims 1 to 9 are included, 11# mining I-steel is used for the shed leg and the beam, 12# common channel steel is used as a buckle, every two rows of shed legs are connected through a pull rod, and the pull rod is 20# round steel.
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| CN103835726A (en) * | 2014-02-20 | 2014-06-04 | 中国庆华能源集团有限公司 | Roadway supporting method and supporting device |
| CN207111135U (en) * | 2017-08-04 | 2018-03-16 | 煤炭工业太原设计研究院 | A kind of steel canopy supported laneway hands over Cha Chu post type lift canopy |
| CN107939419A (en) * | 2017-12-20 | 2018-04-20 | 贵州大学 | A kind of tunnel U-shaped steel covers canopy supporting construction |
| CN109209395A (en) * | 2018-10-25 | 2019-01-15 | 山东东山新驿煤矿有限公司 | The technique of speedy drivage connection roadway in a kind of goaf |
| CN209243595U (en) * | 2018-10-30 | 2019-08-13 | 四川铁创科技有限公司 | A kind of brace steel post |
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