Underground support of stone coal machine mine

1. 1、 There are hidden dangers in the design of fully mechanized mining (caving) face

when the support shield type hydraulic support and chainless haulage shearer are selected, there is no actual working resistance of the hydraulic support for the mining height of the supported coal seam, especially the theoretical checking calculation of the support strength (including the maximum and minimum roof distance) and the hydraulic braking torque of the shearer, However, it can only meet the working resistance of the bracket on the famous brand, which is a parameter of no practical significance. Thus, the safety evaluation of the support quality of the working face can not be deeply analyzed when the support and shearer accidents occur. Countermeasures:

1. The instantaneous movement track of hydraulic support used for mining coal seam support can not be measured by field technicians, so the working resistance and support strength of support can not be calculated. When purchasing hydraulic support, it is necessary to ask for the characteristic curve of working resistance and support strength provided by the manufacturer ring design, so that it can be used on site. Only when the mine pressure measured by the mining height is comparable, can the analysis of the support strength be true

2. According to the dip angle of coal seam, the safety of shearer braking torque should be checked. In order to prevent the "sports car" major accidents, the reliability measures of hydraulic brake should be formulated in the operation proceres< Two hidden dangers of using single prop in most fully mechanized coal mining faces: the working hydraulic pressure of single prop is the same as that of hydraulic support; the pressure source and test standard of single prop before going down the well are confused; it is easy to hurt people and damage the prop. Countermeasures:

1. A pressure recing station (recing 30mp to 20MP) is set at both ends of the hydraulic support pressure pipe for single support

2. The special pump station for single pillar can be set up in the working face with conditions< MT / t549-1996 "maintenance standard of single hydraulic prop" should be used for test before single hydraulic prop goes down the well: high pressure seal (seal pressure ≥ 0.85 rated working pressure, no pressure drop in 2 minutes) and low pressure seal test (seal pressure is 2MPa, no pressure drop in 2 minutes); The above can be tested together with the three-way valve) and can only be used in the well after passing the test

III. hidden danger of fully mechanized coal face trestle

the three supports at the lower end of fully mechanized coal face support are trestle, also known as the reference frame of the whole working face, which is the basis of the safety and quality of the whole working face support. These three hydraulic systems are different from the basic frame and are ignored by many mines<

countermeasures: the hydraulic system of fully mechanized coal mining row head support should be mutual locking system to prevent the support from sliding and falling< 4. The use of the operation of the support in its own frame and the operation of the adjacent frame

there are many unsafe factors when using this operating system in the coal seam with an inclination of more than 15 degrees in many mines

countermeasures: according to the safety regulations, the adjacent support operation should be adopted in the inclined coal seam, and the operators must operate the lower support under the protection of the inclined upper support< In underground oil depots, anti-wear liquefied oil is often found

most of the inspected mines use chainless haulage hydraulic shearers, and mechanical accidents caused by hydraulic oil pollution often occur<

countermeasures: earnestly implement the oil management regulations of "Supplementary Provisions on oil management measures for fully mechanized mining and general mining equipment" issued by the former Ministry of coal, so as to achieve regular oil testing and prevent oil pollution; Anti wear hydraulic oil is strictly prohibited to be stored underground; Before the mechanical injection of hydraulic oil into the well, special oil filtration should be carried out. According to the requirements of mechanical equipment oil injection point, special barrel, quantitative and dedicated personnel should be assigned to rece the occurrence of hydraulic mechanical accidents.

2. First calculate the weight of your rock, then look at the support force of your single support, and then add the force of the following formula, finally select the appropriate support density, have a chance to discuss, and send out your basic parameters,

support design calculation formula
lateral extrusion value:
C = H × TG (450 -
where h -- roadway height, Ka -- pressure coefficient of two sides of roadway
H -- roadway buried depth, R -- average unit weight of roof coal and rock
KC -- coal and rock type coefficient of two sides of roadway, F -- Proctor coefficient
P -- internal friction angle of (coal and rock)
calculation of pressure of two sides of roadway
QC = RC * c * h * sin α
where QC -- lateral pressure RC -- average unit weight of coal and rock on roadway side α—— Calculation of roof pressure of roadway with internal friction angle
QD = 2rd × a × b × cos α
in the formula, RD - average unit weight of roof rock
natural equilibrium arch height B =
in the formula, a - half of roadway width, KD - roof coal rock type coefficient
FD - roof coal rock Proctor system C - lateral extrusion value

3. First of all, it is necessary to establish rules and regulations, and manage by system. Coding management of reusable supporting materials can eliminate the loss phenomenon.

4. 1. The bolting and shotcreting support machinery used in roadway excavation includes bolt machine, hole injector, concrete sprayer and concrete mixer
2. The mining support includes hydraulic support, mining support, roof cutting support, suspension support, hydraulic support, Jack, support machine, column, mining double tension and double resistance grid equipment, support material proction equipment

5. Hardware, tools and appliances are not materials
hardware and electrical appliances belong to the category of "accessories", while tools and instruments belong to the category of "equipment".

6. The utility model relates to a fixing device for a front probe beam of a temporary support in a shed roadway, which relates to a suspension device for a front probe beam of a temporary support in a shed roadway under a coal mine. The device is composed of two symmetrical supporting steel plates, two pairs of hooks, a nut fixing plate, a screw column and a supporting plate. The nut fixing plate fixedly connects the two supporting steel plates together; Two pairs of hooks are respectively arranged outside the upper part of each supporting steel plate. There is a hole in the middle of the nut fixing plate. The nut is fixed in the hole. The screw column is matched with the nut, and a top plate is arranged on the top of the screw column. When in use, two pairs of hooks are respectively hung on the lower edge of I-shaped steel beam or U-shaped steel shed beam, then the front probe beam is penetrated into the lifting ring formed by two supporting steel plates, and finally the screw column is rotated to adjust the distance between the front probe beam and the roadway roof. The utility model has the advantages of simple structure, easy manufacture and convenient adjustment of the distance between the front probe beam and the roadway roof.

7. The so-called beam is a group of two. Step forward according to the required spacing. For example, for the management of 3 and 4 rows, 6 single pillars and 2 long steel beams are needed. If the distance is 1 meter, then one is needed π The section steel beam is one meter ahead of the other one, pushing one row. The original beam one meter ahead of the other one does not move, and the other one is one meter ahead of the other one. The distance between two beams of each group is generally not more than 200 mm. The beam is generally 3.2 meters long. The principle of four to eight beams is the same, except that they are used to protect the nose and tail of the upper and lower exits. As reinforced support, the spacing is generally smaller than the regular support, π The section steel beam is longer than the regular support (because there is a leading exit), we generally use 4 m 2. In order to strengthen the support, we generally hang a single pillar on the long steel beam to strengthen, but it can also be not hung.

8. I think you can look it up in the coal mine safety manual

9. In principle, before using wood support in coal mines, the roof pressure in the mining process should be determined according to the geological data, and the compressive strength and bending strength of the wood pillar should be tested. When working out the operation regulations, the column spacing and row spacing should be calculated for support. However, with the progress of science and technology, many mines use metal support, At present, only steeply inclined coal seams or some extremely thin coal seams or local small mines are still using wooden pillars. At present, the state has no special regulations on coal mine timber pillar support.

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