Creating a new record for network mining at the end of 8 hours、During the completion of the retracement channel, the roof subsidence is controlled within 5cm、The penetration height difference is controlled within 10cm、The retracting bracket adjusts the direction and pulls to realize the automatic movement...it only takes 5 days，Under the application of mature technology of fully mechanized mining withdrawal and pressure control，Hanjiawan Coal Company perfectly realized the rapid withdrawal of 213108 fully mechanized mining face。

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213108 working face has just entered the final mining period，The Production Geometry Technology Management Department of Hanjiawan Coal Company uses the roof pressure online monitoring system，Monitoring the working resistance changes of the bracket column throughout the process。Collecting data from the last 50m section of the end mining、Statistics、Analysis, etc.，The period is calculated as 17 steps.9m。

When pushing mining to the position 30m from the stop line of the working face，Waiting for the cycle to come，Causes roof fracture of overlying rock layer。After the pressure stabilizes，Continue the mining operation，Avoiding the impact of the working surface roof period on the bracket。

m88 casino review"Currently，3-1 The application of coal seam avoidance periodic pressure technology during the end-of-mining period has been very mature，The next step will be to apply the successful experience to the pressure control technology of 4-2 coal composite roof，Laying a good foundation for exploring the application of fully mechanized mining withdrawal and pressure control technology。" said the person in charge of the Production Geometry Technology Department of Hanjiawan Coal Company。

Guarantee the smooth flow of life channels

The beginning of the retracement channel construction，Hanjiawan Coal Company has begun to increase the strength of the roof support of the retreat channel。Using Ф17 at the top.8×8000mm steel strand anchor cable and BHW-4000-250-4 type steel belt supporting support；The gang adopts 15.Strengthened support in the form of 24×3000mm+W steel strip+reinforced mesh，In the shape of "well"，Grid laying roof。

The final mining is pushed to 10m from the stop line，Lay a 267m×11m mining polyester fiber mesh between the working face support and the rock formation，Prevent the directly crushed coal gangue from falling and injuring people。According to the pressure of the roof，Choose stacking brackets with appropriate initial support force，Provide pre-top support for the retracement channel again，Effectively prevent cheating、Connected、Withdrawal period，Damage to the channel from the stress concentration area on the roof，Form several strong lines of defense。

“Since taking m88 casinoearly intervention and reinforcement support measures，Not only reduces the difficulty of retracting the working surface support，Also avoided during retracements，Due to excessive pressure to support，Press the bracket、The danger of gangs hurting people，Improved the efficiency of retracting the bracket。" said the installation team leader。

Seize the key in complex environments

All kinds of things，Comprehensive mining pressure control technology and hydrogeological impact、Working face mining quality、Comprehensive quality requirements、Reinforcement support、Many key points such as network quality are closely related。

Since entering the end of mining，Hanjiawan Coal Company has held several special retreat deployment meetings，Developed a detailed work plan。Drain and release water from the aquifer of the overlying rock formation on the roof in advance；Before the passage is connected，Assign engineering and technical personnel to realistically describe the situation of the last 10m of mining，Master the cutting rules of the coal pusher，Ensure penetration quality；While on the flexible network，Arrange more than 10 full-time personnel to be responsible for "collection、Put、Shake、网”，Prevent the flexible mesh from being cut by the coal machine roller...

The story behind Hanjiawan Coal Company’s exploration and application of fully mechanized mining retraction and pressure-controlled roof technology，It is the tireless pursuit of M88 gamethe development of production technology，It is also an important guarantee for creating the record of “one retracement in five days”。As a new generation of mining strivers，They will use their intelligence，Add new momentum to the high-quality development of mines。(Author: Yang Heng Xiang Haijun  Editor: Wang Yu)