Coal mine underground airbridge construction method

A construction method and wind bridge technology, applied in mine/tunnel ventilation, mining equipment, earthwork drilling and mining, etc., can solve problems such as low efficiency, large amount of engineering, long construction period, etc., and achieve high safety factor, low cost, The effect of short construction period

Active Publication Date: 2012-03-21

SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD

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Problems solved by technology

[0004] In order to solve the problems of low efficiency, large engineering quantity and long construction period of the exis...

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Abstract

The invention relates to a coal mining process, in particular to a coal mine underground airbridge construction method which solves the problems of low efficiency, large engineering quantity, long construction period and the like of the existing airbridge construction method. An air return roadway is tunneled directly along a roof of a coal bed by adopting a mechanical tunneling mode and is crossed with a horizontal roadway, and then is tunneled forward continuously to a horizontal plain so as to form a whole roadway system. An airbridge section is formed in the crossing position of the horizontal roadway and the air return roadway, and then the blasting, top brushing and building are conducted on the airbridge section so as to form an airbridge. Compared with the prior art, the coal mine underground airbridge construction method has the advantages that a semi coal rock roadway is tunneled directly to form the roadway, and then subjected to top brushing and building so as to form the airbridge. The construction is simple and easy, the workload is reduced, the cost is low, the construction period is short, and the safety coefficient is high. The work intensity of workers is reduced, the management of the roof is facilitated, the airbridge construction time is shortened, and the linkage arrangement of production groups is facilitated.

Application Domain

Tunnel/mines ventillationTunnels

Technology Topic

Coal miningSafety coefficient +2

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Examples

Experimental program(1)

Example Embodiment

[0019] Such as figure 1 As shown, the underground air bridge construction method in the coal mine, the return air roadway 2 is directly excavated along the roof of the coal seam by machine tunneling and intersects with the horizontal roadway 1, and then digs forward to the maintenance site, forming the entire roadway system, roadway 1 and return air The intersection of the roadway 2 is the wind bridge section, and then the blasting and roofing are carried out at the wind bridge section to form a wind bridge.

[0020] The wind bridge formed by the construction of the invention has a rectangular section, with a gross section of 12.22 square meters and a net section of 11.25 square meters. The roadway is supported by bolts, metal meshes and metal belts and reinforced with anchor cables.

[0021] The roof part of the roadway adopts Φ18mm, 2.0m long non-ribbed steel screw type resin bolt metal rod, model: MSGLW-400; the top bolt uses MSK2335 resin cartridge and MSZ2360 resin cartridge each; anchoring force is 80KN; Torque is 100N.m; One MSZ2360 resin coil is used for the upper anchor rod; the anchoring force is 80KN; Torque is 80N.m; the spacing is shown in the section; the top anchor rods are all rectangular and use arched pallets and spherical The specifications of the pad and pallet are: length×width×thickness=100mm×100mm×8mm. The grid made of Lianggangjiahang 10# lead wire is a 50mm×50mm warp and weft net; trapezoidal steel belts with a diameter of 14 mm are arranged in rows.

[0022] The anchor cable adopts SKP15×1/1860-5400 type anchor cable, each of which uses one MSK2335 and two MSZ2360, a total of three resin coils, and its pre-tightening force is more than 100KN. The pallet is a steel plate of length×width×thickness=300mm×300mm×16mm.

[0023] The specific construction methods are as follows:

[0024] 1. Use 7655 type air drill wet shallow hole blasting method to lift the top.

[0025] Such as figure 2 As shown, a rectangular middle area is demarcated at the top of the roof at the intersection of the return air lane 2 and the roadway 1. , The front area of the triangle , The back area of the triangle , The top picking should be in accordance with the construction diagram , , Pick the top in order.

[0026] Middle area Part of it is the top of the intersection. The width of the roof is 4.5 meters, the length is 6.626 meters, and the height is 2.52 meters from the roof of the return air lane 2.

[0027] Middle area Partially divided into 6 blocks of length×width×height=2.1-2.3m×4.5m×1.26-1.3m, then pick the top, and finish picking in 6 times, the order is a, b, c, d, e, f .

[0028] When preparing to pick part a, you must first within 0.5 meters on both sides (that is, the rear area Part and under part c) hit double pillars, pick up the top of part a and hit two point pillars as temporary supports, and then pick part b to the required height, first hit two even pillars as temporary supports, and then proceed Permanent support, permanent support adopts anchors, nets, steel belts, high-strength anchor rods with a length of 2.0 meters, with a row spacing of 0.8 meters between anchor rods, and anchor cables for reinforcement.

[0029] Personnel stand in the middle area during construction block a and b Drill holes in the direction of a and b from the bottom of the roof. After the construction of blocks a and b are completed and permanently supported, the personnel will drill holes in the direction of c and d under the roof during the construction of blocks c and d. After the construction of blocks c, d , After permanent support, use the same method to construct blocks e and f.

[0030] Front area , Rear area The part is two left and right oblique angles. The height of the oblique angle is 2.52 meters and the length is 4.365 meters. The oblique angle is cleaned up to 1.2-1.5 meters high each time, and then the anchor rods are supported at a distance of 0.8 meters.

[0031] 2. Wall building: artificial stone for building walls 5. Requirements: Masonry wall 5 is in the return air tunnel 2, the specific location is as follows image 3 It is shown that it is located on both sides of the horizontal roadway 1, the wall height is 2.4 meters, the foundation depth is 0.25 meters, the wall thickness is 0.5 meters, and the length is the width of the return air lane 2. Use 32.5# ordinary Portland cement and medium-grained yellow sand for mining, cement: sand=1:2. It must be horizontal and vertical, with full mortar, no joints or dry joints, and fine mortar should be used to finish the wall after the wall is built.

[0032] 3. Between the two walls 5, canopy I-beam 7, back plate 8, and pouring concrete 9,

[0033] Method: The I-beam 7 is manually lifted, and the concrete is poured by shotcreting. Requirements: The I-beam adopts No. 12 I-beam with a length of 5.5 meters, the spacing between the I-beams is 0.8 meters, and the overlapping wall at both ends is not less than 0.5 meters. After the I-beam 7 is covered, the dense cement back plate 8 is placed on the I-beam, and then poured, with a thickness of not less than 0.5 meters.

[0034] 4. After picking the top, building the wall, and pouring, fill the outer side of the wall with gangue to make a 30° slope with a bottom length of 5.49 meters and an oblique length of 6.34 meters.

[0035] 5. After the slope is completed, the steps are constructed by pouring concrete with artificial mesh formwork. The step length×width×height=0.8m×0.3m×0.17m.

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Easy construction
Improve security

Coal mine underground airbridge construction method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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