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Special Support for Coal Mining Face-Special Support for Top Line of Coal Mining Face
Release time:
2022-12-30
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Special Support for Coal Mining Face-Special Support for Top Line of Coal Mining Face
Special support for (I) face caving line):
The special support for the top line of the working face includes cluster columns, dense pillars, wooden stacks and diagonal braces. Cluster columns are used in working faces with low roof pressure and easy to fall, wooden stacks are used in working faces with high roof pressure and easy to crush supporting equipment, and diagonal braces are used in working faces where pillars at the cutting top line are easy to be pushed across when the roof pressure falls in goaf.
When dense pillars are used to cut the top of the coal mining face, an outlet with a width of more than 0.5m must be left between the two dense pillars, and the distance between the outlets and the advance distance of the new dense pillars must be clearly specified in the operation regulations. When no dense pillars are used to cut the top of the coal mining face, measures must be taken to prevent roof fall and gangue from entering the working face.
(II) wood crib support
1. Method of operation
(1) Determine the stacking position and clean the slag at the stacking position according to the requirements of the operation regulations.
(2) Select qualified materials, lay the bottom layer above the basic pillar along the direction, and then lay the second layer on the inclined bottom layer, and lay the second layer one by one in this order until the top plate is tightly connected.
(3) Make a tightening wedge at each corner of the second or third floor close to the top plate.
2. Precautions
(1) Round wood, triangular wood, mixed seeds, rotten wood, damaged and deformed wood are not allowed to be used for stacking.
(2) The wooden stack shall be made into a square or triangle with the same length of wood. If the length of the material is uneven, it is required that the inclination along the side of the working face must be aligned.
(3) The wooden pile level must be consistent with the inclined surface of the working face, and the mountain angle should be consistent with the mountain angle of the basic support.
(4) The upper and lower contact points of each layer of the wooden stack must be in a straight line.
(5) The length of the wooden stack shall not be less than the row spacing, and generally shall not be less than 1.2m.
(6) The length of the wooden stack after overlapping shall not be less than 0.15m, and shall be 90 ° to each other.
(7) When stacking wooden stacks, check the bracket condition at the place first. If there is any broken or incomplete bracket, it must be properly handled before erecting wooden stacks.
(8) The erection of wooden stacks must be advanced to the column by more than 15m.
(9) When stacking wooden stacks at faults or cracks, wooden stacks must be erected on both sides of the faults or cracks respectively, and only one wooden stack is not allowed to be built directly under them.
(10) bollards must be laid under the wooden stacks of inclined and sharply inclined working faces. Baffles shall be set above the stacking position before erection of wooden stacks.
(III) dense struts or cluster columns
1. Method of operation
The operation method of dense pillars or cluster pillars is the same as that of wooden pile support.
2. Precautions
(1) The number, row and column spacing of dense pillars or cluster pillars shall meet the requirements of operation regulations.
(2) When hitting dense pillars, leave a safety exit every 3~5m so as to discharge materials and evacuate people when returning to the top of the pillar.
(3) When using wooden pillars, their diameter shall not be less than the diameter of the basic pillars.
(IV) lifting shed or berth
1. Method of operation
The sequence of operations and quality requirements for raising sheds or berms are the same as those for basic struts.
2. Precautions
(1) The position and quantity of lifting shed or berth column shall meet the requirements of operation regulations.
(2) The lifting shed must be firmly connected with the basic support. If there is any gap, it must be fastened with wooden wedges. The wooden shed legs must pull the duckbill.
(3) The erected shed must be placed more than 10m in advance.
(4) The berm column shall be perpendicular to the working surface line, and the berm angle shall form about 40 degrees with the vertical line of the top plate of the working surface. If metal pillars and roof beams are used, wooden caps shall be used for the head of the berth.
(5) The column foot of the berth column shall have the column socket or pedal on the column root of the second row cut top column.
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