CN103628911A - Fully-mechanized coal mining/ caving working face sectional type gob-side entry retaining method - Google Patents

Abstract

The invention relates to a segmented gob-side entry retention method in a fully mechanized mining/caving working face, which belongs to the field of mine support. It includes arranging the air inlet and return airways on both sides of the mining face, setting coal pillars between the outer ring air inlet and outer ring air return roads, and also includes the following steps: hydraulic support at the end of the mining face Strengthen the support between the ends or at the top plate behind the hydraulic support at the end; set up a reinforcement mesh behind the hydraulic support at the end to assist the formation of the filling body, hang the filling bag on the reinforcement mesh, and set hydraulic props around the reinforcement mesh; The water material slurry is poured into the filling bag suspended in the steel mesh. After the filling slurry is solidified, the hydraulic prop is removed, the filling body is reinforced, and the construction of the filling wall is completed; It is filled and sealed with the roadway and connecting roadway behind; its process is simple, convenient for construction, easy for workers to master, high in filling body bearing capacity, large in section, small in underground auxiliary transportation volume and high in safety and reliability.

Description

A segmented gob-side entry retention method in fully mechanized mining/caving face

technical field

The invention relates to a gob-side entry retaining method, in particular to a segmented gob-side entry entry method suitable for underground temporary or permanent support in fully mechanized mining/caving working faces.

Background technique

At present, the treatment of gas usually adopts comprehensive management methods such as drainage before mining, mining while mining, etc. However, for coal seams with strong adsorption and high gas content, it takes a long time to adopt the method of drainage, which often affects the mining face. Instead, some high-gas mines adopt the double U-shaped ventilation method, increase the air distribution volume, reduce the upper corner of the working face and the gas concentration of the return air channel, and achieve the goal of safe mining.

In order to avoid excessive gas in the corners of the working face and in the return air trough, it is necessary to reserve a section of the return air trough between the back of the working face and the connecting roadway after the mining of the working face, and divert the gas content in the return air trough, and when the work When the face advances to the next connection roadway, the connection roadway behind the original goaf is closed, the next connection roadway is opened, and the remaining roadway between the two connection roadways completes the task. In the past, wooden piles were often used for roadway protection, which resulted in a large consumption of pit logs. Not only the cost of retaining the roadway was high, and it was not environmentally friendly, but also the wooden piles were flammable support products, which required high labor intensity for workers, heavy auxiliary transportation workload, and slow construction speed; At the same time, under the action of the return wind behind the goaf and the rotation and sinking of the trough roof, the wooden piles with low support strength are prone to instability and damage, blocking the roadway retention, and affecting the smooth discharge of gas to the tile row roadway at the upper corner.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a segmented gobside entry retention with high water material filling body construction with simple construction, high degree of mechanization, small space occupation, large supporting capacity and good economic benefits .

In order to achieve the above technical purpose, the segmented gobside entry retention method of fully mechanized mining/caving working face of the present invention includes arranging air inlet lanes and air return lanes on both sides of the mining face, outer ring air inlet lanes and outer ring return air lanes A roadway coal pillar is left between, and it also includes the following steps:

a. In the coal mine underground roadway, with the advancement of the mining face, the anchor rod or anchor cable is driven between the end hydraulic supports of the mining face or at the roof behind the end hydraulic supports;

b. Reinforced mesh is erected behind the end hydraulic support to assist the filling body to form and reinforce the filling body, hang the filling bag on the reinforced mesh, and set multiple single hydraulic props around the reinforced mesh;

c. Pour the uniformly mixed high-water material slurry into the filling bag suspended in the steel mesh. After the filling slurry is solidified, remove the single hydraulic prop, and reinforce the filling body with the pull anchor rod to complete a stack of filling walls. construction;

d. Repeat steps a, b, and c to complete continuous wall filling;

e. Fill and seal the gob-side entry at 1-2m behind the connection roadway for return air, and the rear roadway and connection roadway;

f. When the mining face pushes through the next lane, repeat step d.

The distance between the connecting lanes is 40 ~ 100m; the size of the steel mesh network is 40 ~ 100mm, and the diameter of the steel mesh reinforcement is 4 ~ 8mm; the diameter of the anchor rod is 18 ~ 26mm; Flammable, antistatic material filled bags.

Beneficial technical effects: The segmented gobside entry retention method of fully mechanized mining/caving working face of the present invention uses evenly mixed high-water material slurry to pour into the filling bag suspended in the steel mesh, and forms filling after the filling slurry is solidified wall, and the filling body is strengthened by pulling anchor rods. The process is simple, convenient for construction, easy for workers to grasp, high in the loading capacity of the filling body, large in section, small in underground auxiliary transportation, and high in safety and reliability. Has a wide range of practicability.

Description of drawings

Fig. 1 is a schematic structural diagram of an example of the segmented gob-side entry retention of the fully mechanized mining/caving face of the present invention.

In the figure: 1-Hydraulic support, 2-Inlet airway, 3-Outer circle air inlet lane, 4-Goaf, 5-Filling wall, 6-Protection coal pillar, 7-Outer circle return airway, 8 - return air lane, 9 - airtight wall, 10 - filling bag, 11 - single hydraulic prop, 12 - steel mesh, 13 - contact alley, 14 - airtight partition wall.

Detailed ways

An embodiment of the present invention will be described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, the segmented gobside entry retention method of the fully mechanized mining/caving working face of the present invention includes arranging the air inlet lane 2 and the air return lane 8 on both sides of the mining face, the outer ring air inlet lane 3 and the outer air inlet lane. Circle the return air alley 7, and leave the protective alley coal pillar 6 between the return air alley 8 and the outer circle return air alley 7, and also include the following steps:

a. In the coal mine underground roadway, with the advancement of the mining face, the anchor rod or anchor cable is driven between the end hydraulic supports 1 of the mining face or at the roof behind the end hydraulic support 1;

b. Reinforced mesh 12 is erected behind the end hydraulic support to assist the filling body to form and reinforce the filling body, hang the filling bag 10 on the reinforced mesh 12, and set a plurality of single hydraulic props 11 on the periphery of the reinforced mesh 12, the reinforced mesh 12 The size of the network is 40~100mm, and the diameter of the reinforcement mesh 12 steel bars is 4~8mm;

c. Pour the uniformly mixed high-water material slurry into the filling bag 10 suspended in the steel mesh, and after the filling slurry solidifies, remove the single hydraulic prop 11, and reinforce the filling body with the anchor rod to complete a pile of filling For the construction of the wall, the diameter of the anchor rod is 18-26mm; the filling bag is made of flame retardant and antistatic material;

d. Repeat steps a, b, and c to complete the continuous wall filling 5;

e. Fill and seal the gob-side retention at 1-2m behind the connecting alley 13 for return air, the rear roadway and the connecting alley 14; the distance between the connecting alleys 13 is 40-100m; Wall 9, the connection lane 13 close to the working surface opens the airtight wall 9, and the sewage flows through the connection lane 13 into the return air lane 7 of the outer ring, forming a two-inlet and two-back ventilation system, reducing the gas content in the upper corner of the working surface and diverting backflow. Gas content in wind lane 8;

f. When the mining face pushes through the next roadway 13, repeat step d.

The connection lane 13 close to the working face opens the airtight wall 9, and the sewage flows into the outer return air lane 7 through the communication lane 13, forming a two-inlet and two-return ventilation system, reducing the gas content in the upper corner of the working face and diverting the return air lane 8 gas content in.

Claims (5)

1. A method for segmented gobside entry retention in fully mechanized mining/caving working faces, comprising arranging air inlet lanes (2) and air return lanes (8), outer ring air inlet lanes (3) and air return lanes (8) on both sides of the mining face A roadway protection coal pillar (6) is left between the return air lanes (7) in the outer ring, and the feature is that it also includes the following steps: a. In the coal mine underground roadway, with the advancement of the mining face, the anchor rod or anchor cable is driven between the end hydraulic supports (1) of the mining face or at the roof behind the end hydraulic support (1); b. Erection of reinforcement mesh (12) behind the hydraulic support at the end to assist the formation of the filling body and reinforce the filling body, hang the filling bag (10) on the reinforcement mesh (12), and arrange multiple single hydraulic props on the periphery of the reinforcement mesh (12) (11); c. Pour the uniformly mixed high-water material slurry into the filling bag (10) suspended in the steel mesh, and after the filling slurry is solidified, remove the single hydraulic prop (11), and reinforce the filling body with the anchor bolt. Complete the construction of 1 stack of filling walls; d. Repeat steps a, b, and c to complete the continuous filling of the wall (5); e. Fill and seal the gob-side entry at the back 1-2m of the connection roadway (13) for return air, the rear roadway and the connection roadway (14); f. When the mining face is pushed through the next roadway (13), step d is repeated. 2. The segmented gob-side entry retention method for fully mechanized mining/caving working face according to claim 1, characterized in that: the distance between the connecting entryways is 40-100m. 3. The segmented gobside entry retention method for fully mechanized mining/caving working face according to claim 1, characterized in that: the size of the reinforcement mesh network is 40-100 mm, and the diameter of the reinforcement mesh reinforcement is 4-8 mm. 4. The segmented gob-side entry retaining method in fully mechanized mining/caving working face according to claim 1, characterized in that: the diameter of the tie bolts is 18-26mm. 5. The segmented gobside entry retention method for fully mechanized mining/caving working face according to claim 1, characterized in that: the filling bag is made of flame retardant and antistatic material.

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