CN102720498A - Gob-side entry retaining mining process for coal face - Google Patents

Abstract

The invention discloses a gob-side entry retaining mining process for a coal face. The method comprises the following steps of: firstly performing temporary support on a top plate by supporting with two rows of hydraulic single support columns on the side of the designed entry retaining region beside the transport lane after the lower end of the coal face is pushed with one cycle during progress of the coal face; then performing normal support on the top plate by arranging a row of reinforcing anchor cables on the top plate of the original laneway in the position 0.3 meters from the support wall and arranging a row of steel pipe-concrete support columns on the top plate of the original laneway in the position 0.6 meters from the base plate of the original laneway; and finally performing support on a lateral wall shield lane by protecting the lane with reinforcement meshes in combination with woven bags loading gangue and then stacking gangue bags and finally injecting a concrete coating to cover the reinforcement meshes. The method fills in the blank of lane side-wall support and shield lane in the prior art, reduces the support cost, increases the support strength, greatly increases the construction speed, has a simple process and a significant effect, and effectively reduces the ten thousand ton-level drivage ratio.

Description

Retaining Roadways Along Goaf at Coal Face production practice method

Technical field

The present invention relates to the coal-mining technique field, be applicable to medium stablizing, low gaseous mine, no bump and area of stress concentration structure, nearly level and gentle dip girdle and medium-thickness seam fully-mechanized mining working with the upper plate condition.

Background technology

During the coal mine fully-mechanized mining working exploitation, for reducing the loss of coal column, large tracts of land has been promoted the gob side entry retaining production practice.

At present, gob side entry retaining production practice technology mainly contains following several kinds:

Build waste pack by laying bricks or stones, install close standing props or grillage, add the Guyuan tunnel metallic support, adopt and mould to be arranged or do not have the mould filling technique.More than several kinds of technology all have following deficiency.

1. build waste pack technology by laying bricks or stones: pay the support ability in advance, cause the excessive sinking of top board to cause back to fracture easily, finally cause staying the lane failure.

2. pillar or crib protection: support material uses many, and workload is big, supporting and protect the lane weak effect.

3. the metallic support that adds the Guyuan tunnel: construction technology is complicated, and poor stability supports top board repeatedly, causes roof break, fragmentation, and it is relatively poor to protect the lane effect.

4. cement or other materials filling process: complex process, equipment has high input, and the filler cost is higher.

Therefore, how to realize high strength, low cost, simple to operate, protect the tight edge air gallery technology in lane and remain a great problem in the coal mining.

Summary of the invention

The present invention is the deficiency that overcomes prior art, has proposed a kind of new Retaining Roadways Along Goaf at Coal Face production practice method.

Technical scheme is following:

The first step: top board temporary lining

Along with the propelling of work plane, after circulation of work plane lower end propelling, the other goaf side in the lane, transportation lane of design presses individual prop to carry out supporting with two discharge opeings, and two discharge opeings press individual prop to wear footwear, prop up to be located on the work plane floor rock; The first row's pillar post that leans on goaf side is apart from 0.8 meter; Arrange metal roof bar on second row's individual prop, 1 meter of post distance, 0.5 meter of array pitch; Band strengthening cap supporting on the individual prop is pressed in two discharge opeings, and cap adopts the thick plank of 15-30cm; According to the top board lithology, before the work plane first weighting, temporary lining length is got 50 meters, and behind the first weighting, the temporary lining distance is got 30 meters; Two row's individual props layout that will be in line, two arrange individual props the prop setting angle degree be 3-4 °;

The 3rd step: the regular supporting of top board

On the top board in former tunnel, arrange row's reinforcement anchor cable apart from 0.3 meter of support wall, anchor cable specification φ 17.8 * 6200mm, spacing 3-4 rice is arranged a row steel tube concrete pillar at 0.6 meter of the former roadway floor of distance again, post is apart from 1.0 meters; Described concrete filled steel tube pillar: be at seamless steel pipe, pour into the C40 concrete, require yield strength greater than 236N/mm ², thickness of steel pipe is not less than 4mm, the ratio 65-70 of outer diameter of steel pipes and wall thickness, and slenderness ratio is not more than 20;

The 3rd step: lateral wall protects the lane mode

Adopt steel mesh reinforcement to cooperate the packed spoil of braiding to protect the lane; Promptly fix steel mesh reinforcement in the outside of concrete filled steel tube pillar; Steel mesh reinforcement adopts φ 6mm welded steel fabric, mesh 100 * 100mm, stacking spoil bag then; 1.5 meters of spoil bag stacking bottom width, 1 meter of top width, the spoil bag is to load onto spoil with Nylon Bag in the down-hole to form; For preventing that the goaf from leaking out, on steel mesh reinforcement, spray a layer concrete again and cover.

The invention solves the gob side entry retaining traditional handicraft at roadside support and protect the technical shortcoming in lane, reduced support cost, improved supporting intensity; Improved speed of application greatly, technology is simple, and effect is remarkable; Effectively reduce ten thousand tons of drivage ratios; Shorten work plane time, stopped the protection pillar loss, improved the safe coefficient in resource recovery and colliery.

Description of drawings

Fig. 1 is the sketch map of the embodiment of the invention.

The specific embodiment

Practical implementation of the present invention such as summary of the invention are said, and those skilled in the art can implement according to the record of Fig. 1 and manual fully, are not described in detail in this.

Claims (1)

1. Retaining Roadways Along Goaf at Coal Face production practice method is characterized in that step is following:

The first step: top board temporary lining

Along with the propelling of work plane, after circulation of work plane lower end propelling, the other goaf side in the lane, transportation lane of design presses individual prop to carry out supporting with two discharge opeings, and two discharge opeings press individual prop to wear footwear, prop up to be located on the work plane floor rock; The first row's pillar post that leans on goaf side is apart from 0.8 meter; Arrange metal roof bar on second row's individual prop, 1 meter of post distance, 0.5 meter of array pitch; Band strengthening cap supporting on the individual prop is pressed in two discharge opeings, and cap adopts the thick plank of 15-30cm; According to the top board lithology, before the work plane first weighting, temporary lining length is got 50 meters, and behind the first weighting, the temporary lining distance is got 30 meters; Two row's individual props layout that will be in line, two arrange individual props the prop setting angle degree be 3-4 °;

The 3rd step: the regular supporting of top board

On the top board in former tunnel, arrange row's reinforcement anchor cable apart from 0.3 meter of support wall, anchor cable specification φ 17.8 * 6200mm, spacing 3-4 rice is arranged a row steel tube concrete pillar at 0.6 meter of the former roadway floor of distance again, post is apart from 1.0 meters; Described concrete filled steel tube pillar: be at seamless steel pipe, pour into C ₄₀Concrete requires yield strength greater than 236N/mm ², thickness of steel pipe is not less than 4mm, the ratio 65-70 of outer diameter of steel pipes and wall thickness, and slenderness ratio is not more than 20;

The 3rd step: lateral wall protects the lane mode

Adopt steel mesh reinforcement to cooperate the packed spoil of braiding to protect the lane; Promptly fix steel mesh reinforcement in the outside of concrete filled steel tube pillar; Steel mesh reinforcement adopts φ 6mm welded steel fabric, mesh 100 * 100mm, stacking spoil bag then; 1.5 meters of spoil bag stacking bottom width, 1 meter of top width, the spoil bag is to load onto spoil with Nylon Bag in the down-hole to form; For preventing that the goaf from leaking out, on steel mesh reinforcement, spray a layer concrete again and cover.