阅读说明：本技术 一种井下压缩块体堆砌式充填系统及方法 (Underground compressed block stacking type filling system and method ) 是由 赵新元 杨科 魏祯 张继强 姬健帅 王金江 陈瑞意 于 2021-01-04 设计创作，主要内容包括：为了提高采空区充填体的密实度,公开了一种井下压缩块体堆砌式充填系统及方法。该充填系统包括充填材料配制系统、压缩成型系统、充填压缩块体输送系统和采空区块体充填系统以及各系统中使用的装备,压缩块体堆砌式充填方法是将充填系统、充填装备和及其工艺流程按照一定的时空顺序相互配合,具体主要包括充填材料的配制、充填压缩块体的压缩成型、充填压缩块体的输送和充填压缩块体堆砌采空区及喷浆加固等。该方法提前将充填材料压缩成型,预制成高密实度的压缩充填压缩块体,减少了充填体在采空区顶板作用下的压缩量,较好的解决了常规固体充填过程中采空区充填体密实度低、控顶效果不佳等问题,实现采空区密实充填。(In order to improve the compactness of the goaf filling body, a stacking type filling system and a stacking type filling method for underground compressed blocks are disclosed. The filling system comprises a filling material preparation system, a compression molding system, a filling compression block conveying system, a goaf block filling system and equipment used in the systems, wherein the compression block stacking type filling method is characterized in that the filling system, the filling equipment and the process flow of the filling system are matched with each other according to a certain space-time sequence, and the filling material preparation, the compression molding of the filling compression block, the conveying of the filling compression block, the stacking of the filling compression block into the goaf, the guniting reinforcement and the like are mainly included. The method has the advantages that the filling material is compressed and molded in advance, the compressed filling compressed block with high compactness is prefabricated, the compression amount of the filling body under the action of the goaf top plate is reduced, the problems of low compactness, poor top control effect and the like of the goaf filling body in the conventional solid filling process are well solved, and the goaf dense filling is realized.)

1. A down-hole compressed block stacking type filling system mainly comprises a filling material preparation system, a compression molding system, a compressed block conveying system, a compressed block filling system and the like.

2. The system of claim 1, wherein the compressed block packing system comprises a specially-made push-in block type packing rack, the rear portion of the rack is specially-made for push-in packing blocks, and the system comprises a transverse telescopic push plate, a movable platform, a post-rack conveyor and the like.

3. The concrete flow of the underground compressed block stacking type filling method is as follows:

the first process is that filling materials in each material storage bin are placed into a material mixing barrel according to a certain proportion, a certain amount of water is added, a stirrer is started to fully stir the mixing materials, and the mixed filling materials meet the following requirements: the paste-like product has a mass fraction of 80% or more, a bleeding rate of 2% or less, good workability, a setting time of 4-6 hours or less, and a setting strength of 2MPa or more. And transferring the mixed filling material to a filling material compression molding system through a belt conveyor. The filling material in the material mixing barrel should be in the stirring state continuously, and the filling material in the mixing barrel should be guaranteed not to be less than 1/3 of bucket volume in the filling compression block manufacturing process, avoids influencing follow-up job schedule.

And secondly, adjusting the size of the compression molding box, opening a control switch at the tail of the belt conveyor, putting the filling material into the compression molding box with the bottom and the peripheral steel plates fixed, starting an upper pressure head of the press machine after the filling material is uniformly paved in the compression molding box, and performing slow compression operation on the filling material in the compression molding box. The amount of pressure applied is dependent upon the overburden loading at the work surface and is typically between 80% and 110% of the overburden loading. And after the filling material is compressed into a high-density compressed block with the height of 30-40cm, opening the right steel plate, and pushing the left steel plate by a jack behind the left steel plate to push the filling compressed block formed by compressing the filling material out from the right outlet until the filling compressed block is contacted with a driving wheel on the support frame.

And step three, starting the conveying system while the compression molding of the filling material is carried out, starting a motor on the driving wheel, and enabling the driving wheel to normally rotate. After the compressed and molded filling compressed block is pushed to the driving wheel on the conveying support frame, the filling compressed block slides forwards under the pushing of the driving wheel and the rotation of the driven wheel, after the filling compressed block is conveyed out of the distance of the conveyor support frame, the compression molding box is adjusted again, and the next compression molding work of the filling compressed block is carried out.

And fourthly, straightening the working face filling support to enable the conveyor behind the support to be arranged in a straight line, connecting the support rollers between the support and the support end to prevent larger vacancy, and reserving a discharge opening on the conveyor behind the last support at the tail of the working face machine to facilitate discharging and filling the compressed block. The filling compressed blocks are conveyed to the conveyor behind the frame by the conveying system, and the discharging of the filling compressed blocks is carried out from the tail of the working face machine to the head. Before the filling compressed block body reaches the tail, the movable platform is started to lift to the position which is consistent with or close to the height of the after-frame conveyor, the filling compressed block body is pushed to the discharge opening at the tail through the driving wheel, the driving wheel on the after-frame conveyor adjacent to the discharge opening pushes the filling compressed block body to be discharged onto the movable platform from the discharge opening, and then lowering the mobile platform to enable the upper surface of the filling compression block on the mobile platform to be on the same horizontal plane with the conveyor behind the frame, enabling the unloading work of the next filling compression block to be consistent with the unloading work of the first filling compression block, enabling the filling compression block to be superposed on the first filling compression block, and then descending the mobile platform and the unloading and superposing work of the filling compression block are carried out according to the above operation until the mobile platform descends to the bottom of the support and contacts with the ground, and the filling compression block is superposed to a position close to the mining height. Then start moving platform's horizontal jack, extend moving platform to the collecting space area, start horizontal flexible push pedal simultaneously, wait that moving platform removes in the collecting space area and make filling compressed block on the platform and the last step of distance fill compressed block contact the back and stop, then horizontal flexible push pedal supports filling compressed block on the moving platform, withdrawal moving platform makes the compressed block that fills that piles up fall into in the collecting space area, the horizontal flexible push pedal of withdrawal begins the work of filling of next support, the order of filling is gone on to the aircraft nose from the working face tail in proper order. In order to tightly connect the filling compression blocks stacked in the goaf and reduce the block gaps, high-pressure slurry spraying (grouting) operation is carried out on the goaf as necessary so that the filling compression blocks are cemented into a whole.

4. The method for filling the underground compressed block in the stacking manner according to claim 3, wherein in the second process, after the filling material is placed into the compression molding box, a press head of the press is started to compress the filling material in the compression molding box, so that the filling material is compressed into the high-strength block, and then the lateral jacks are started to push the compressed block out of the compression molding box.

5. The method according to claim 3, wherein in the fourth process, the compressed blocks are sequentially unloaded from the post-rack filling conveyor onto the moving platform stacked below until the moving platform descends to the bottom of the rack, the height of the stacked compressed blocks on the platform is close to the top plate, the moving platform is moved into the goaf, the transverse telescopic push plate is extended simultaneously, the compressed blocks stacked on the moving platform are pushed to the goaf and are in contact with the compressed blocks at the previous step, and then the moving platform and the transverse telescopic push plate are withdrawn to perform the filling operation of the next rack.

Technical Field

The invention belongs to the technical field of solid filling green mining in the coal industry.

Background

The solid filling technology becomes an important green mining technology for solving the problem of coal pressing under three conditions and improving the environment of a mining area, and is widely applied due to the social benefit, the economic benefit and the environmental benefit. In the solid filling, the general method is to convey the gangue-based solid filling mixed material to a working surface through a backfill conveyor, push the solid filling material into a goaf under the action of a special filling support, and tamp the material through a tamping mechanism on the support. At present, corresponding public data are provided for a method, a system composition, a mining, selecting and filling + x and other filling technologies of solid filling mining, such as a mining, selecting and filling + x mining mode (notice number: CN109209379A) and the like. The method is already applied to the ground in mines such as Hebei and Shandong. However, in the application process, after the gangue solid is filled into the goaf, the filling material is tamped by the tamping mechanism on the filling support, but the filling material in the goaf still has the problems of low compactness, loose material and the like, so that the compression amount of the filling material is large, the subsidence amount of the top plate is large, and the effect of controlling the surface subsidence is reduced. Therefore, in the solid filling mining technology, how to effectively improve the compactness of the goaf filling body with low cost and make the filling process simpler and more convenient becomes a problem to be solved at present.

Disclosure of Invention

The invention provides a down-hole compressed block stacking type filling system and a filling method, aiming at solving the problems of low compactness of a goaf filling body, loose filling materials and the like in the conventional solid filling mining application.

The invention provides the following technical scheme:

the underground compressed filling and compressed block stacking type filling method mainly comprises a filling material preparation system, a compression molding system, a compressed block conveying system, a compressed block filling system and the like, and space-time matching is carried out among the systems according to a certain sequence.

The filling material preparation system mainly comprises various material storage bins, a feeding pipeline, a stirrer, a material mixing barrel, a material belt conveyor and the like, wherein the material storage bins and the material mixing barrel are connected with the compression molding system through the belt conveyor. The material storage bin can be divided into a waste rock bin, a fly ash bin, other coal-based solid waste material bins, a cementing material bin and the like. The tail of the material belt conveyor is provided with a control switch for controlling the operation of the belt conveyor and controlling the quantity of the stirred materials entering the forming box.

The filling material compression molding system mainly comprises a press machine and a compression molding box matched with the press machine, wherein the maximum applied pressure of the press machine is 1.2-1.3 times of the load of an overlying rock stratum of a filling working surface, the width of the compression molding box is 0.6-0.8m, the specific width is consistent with or 2 times of the mining step distance of the working surface, the height is in the range of 30-50cm, the length is in the range of 1.5-1.8m, and the specific length is not more than the length of a hydraulic support of the working surface. The steel sheet is fixed around the compression molding case, and the left side steel sheet is connected with small-size jack, and the right side steel sheet is movable steel sheet, utilizes small-size jack to push to move the left side steel sheet and will fill the compression block and push to the conveyer on from the right side after making things convenient for the packing material compression blocking. The bottom steel plate of the compression molding box is connected with a conveyor of a conveying system, the upper steel plate is fixed with a pressure head of a press machine and moves up and down along with the expansion and contraction of the pressure head, and the length and the width of the upper steel plate are consistent with those of the inner side of the compression molding box.

The compressed block conveying system is respectively connected with the compression molding system and the goaf block filling system and mainly comprises a conveying support frame, a carrier roller and a motor, wherein the carrier roller is divided into a driving wheel and a driven wheel, the driving wheel is generally positioned in the front and back positions of one support frame and provides forward power for filling compressed blocks, the carrier roller is supported by the support frame, the radius of the carrier roller is 5-10cm, the length of the carrier roller is 40-50cm, the height of the carrier roller is about 50cm from the ground, and the carrier roller is positioned at the uppermost end of the support frame, so that materials can be smoothly conveyed above the support frame to avoid collision and friction with the support frame.

The compressed block filling system is mainly a specially-made push-in block type filling support, the front part of the support is basically consistent with the front part of a conventional support, the support is composed of a coal mining machine, a hydraulic support, a conveyor and other mechanisms, the rear part of the support is specially-made for pushing in blocks, and the compressed block filling system mainly comprises a transverse telescopic push plate, a moving platform, a post-support conveyor and other devices. The composition and parameters of the after-frame conveyor are basically consistent with those of the filling compression block conveyor, the after-frame conveyor is suspended above the rear part of the hydraulic support and is connected with the top beam of the support, the height of the after-frame conveyor is 35-45cm away from the top beam, and the filling compression block can smoothly pass through the after-frame conveyor without being contacted and collided with the top of the support. The carrier roller is not installed on the last support of the tail of the after-frame conveyor, driving wheels are installed on the two sides of the after-frame conveyor in each support, driven wheels are installed on the rest positions, the carrier rollers of the after-frame conveyor of one support form a group, and the group of carrier rollers can integrally move to the adjacent supports to reserve a discharge opening for filling the compressed blocks. The moving platform can reciprocate, and the highest can be located about filling conveyer lower part 20cm, conveniently fills the compression block and can fall on the moving platform and pile up in proper order, can also translate around when the platform is located the bottom, can be with filling the compression block translation to collecting space area. The horizontal flexible push pedal can the back-and-forth movement, is responsible for in the orderly propelling movement of the filling compression block that will pile up to the collecting space area.

The specific filling method is shown as the following flow:

the first process is that filling materials in each material storage bin are placed into a material mixing barrel according to a certain proportion, a certain amount of water is added, a stirrer is started to fully stir the mixing materials, and the mixed filling materials meet the following requirements: the paste-like product has a mass fraction of 80% or more, a bleeding rate of 2% or less, good workability, a setting time of 4-6 hours or less, and a setting strength of 2MPa or more. And transferring the mixed filling material to a filling material compression molding system through a belt conveyor. The filling material in the material mixing barrel should be in the stirring state continuously, and the filling material in the mixing barrel should be guaranteed not to be less than 1/3 of bucket volume in the filling compression block manufacturing process, avoids influencing follow-up job schedule.

And secondly, adjusting the size of the compression molding box, opening a control switch at the tail of the belt conveyor, putting the filling material into the compression molding box with the bottom and the peripheral steel plates fixed, starting an upper pressure head of the press machine after the filling material is uniformly paved in the compression molding box, and performing slow compression operation on the filling material in the compression molding box. The amount of pressure applied is dependent upon the overburden loading at the work surface and is typically between 80% and 110% of the overburden loading. And after the filling material is compressed into a high-density compressed block with the height of 30-40cm, opening the right steel plate, pushing the left steel plate by a jack behind the left steel plate to push the filling compressed block formed by compressing the filling material out from the right outlet until the filling compressed block is contacted with a driving wheel on the conveyor bracket.

And step three, starting the conveying system while the compression molding of the filling material is carried out, starting a motor on the driving wheel, and enabling the driving wheel to normally rotate. After the compressed and molded filling and compressing block body is pushed to the driving wheel on the conveyor support, the filling and compressing block body slides forwards under the pushing of the driving wheel and the rotation of the driven wheel, after the filling and compressing block body is conveyed out of the distance of one conveyor support, the compression molding box is adjusted again, and the next compression molding work of the filling and compressing block body is carried out.

And fourthly, straightening the working face filling support to enable the conveyor behind the support to be arranged in a straight line, connecting the support rollers between the support and the support end to prevent larger vacancy, and reserving a discharge opening on the conveyor behind the last support at the tail of the working face machine to facilitate discharging and filling the compressed block. The filling compressed blocks are conveyed to the conveyor behind the frame by the conveying system, and the discharging of the filling compressed blocks is carried out from the tail of the working face machine to the head. Before the filling compressed block body reaches the tail, the movable platform is started to lift to the position which is consistent with or close to the height of the after-frame conveyor, the filling compressed block body is pushed to the discharge opening at the tail through the driving wheel, the driving wheel on the after-frame conveyor adjacent to the discharge opening pushes the filling compressed block body to be discharged onto the movable platform from the discharge opening, and then lowering the mobile platform to enable the upper surface of the filling compression block on the mobile platform to be on the same horizontal plane with the conveyor behind the frame, enabling the unloading work of the next filling compression block to be consistent with the unloading work of the first filling compression block, enabling the filling compression block to be superposed on the first filling compression block, and then descending the mobile platform and the unloading and superposing work of the filling compression block are carried out according to the above operation until the mobile platform descends to the bottom of the support and contacts with the ground, and the filling compression block is superposed to a position close to the mining height. Then start the horizontal jack of support bottom, extend moving platform to the collecting space area, start horizontal flexible push pedal simultaneously, wait that moving platform removes in the collecting space area and make filling compressed block on the platform and the last step of distance fill compressed block contact the back and stop, then horizontal flexible push pedal supports filling compressed block on the moving platform, withdrawal moving platform makes the compressed block that fills that piles up fall into in the collecting space area, the horizontal flexible push pedal of withdrawal begins the work of filling of next support, the order of filling is gone on to the aircraft nose from the working face tail in proper order. In order to tightly connect the filling compression blocks stacked in the goaf and reduce the gaps of the stacked filling compression blocks, high-pressure slurry spraying (grouting) operation is carried out on the goaf as necessary so as to glue the filling compression blocks into a whole.

As a preferred technical scheme of the invention, the compression molding system mainly comprises a compression molding box, a press head on a press machine and a press plate fixed with the press head.

As a preferred technical scheme of the invention, the specially-made pushing block type filling support is mainly characterized in that a support rear member mainly comprises a transverse telescopic push plate, a movable platform, a support rear conveyor and the like.

As a preferred technical solution of the present invention, the stacking filling method mainly includes the steps of stirring the filling material, compression molding of the compressed blocks, conveying the compressed blocks, stacking and filling the compressed blocks, and the like.

The invention has the following advantages:

the invention improves the original solid filling hydraulic support, so that the solid filling hydraulic support is more suitable for the stacking filling process of filling compressed blocks, and has certain innovativeness and practical feasibility. The method comprises the steps of compressing and molding filling materials in advance, prefabricating a high-compactness compressed filling compressed block, pushing the stacked compressed filling block into the goaf through a special support, reducing the compression amount of the filling body under the action of a top plate of the goaf, and realizing dense filling. The method effectively improves the compactness of the goaf filling body, reduces the compression of the top plate on the filling body, further reduces the bending subsidence of the top plate and the subsidence of the ground surface, simultaneously, the filling compressed block in the goaf has higher tightness, reduces the phenomena of gas accumulation, spontaneous combustion of residual coal, air leakage of a working surface and the like in the goaf, realizes the purpose of in-situ coal replacement of the filling material, saves the cost, and has good economic and applicable effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a filling material dispensing system.

Fig. 2 is a schematic view of compression molding of the filling material and transfer of the compressed block.

FIG. 3 is a schematic illustration of a face compressed block drop stack.

Figure 4 is a schematic view of the pushing of the work surface compression block into the gob. A (c),

In the figure: 1. a material storage bin; 2. a feed line; 3. a material mixing barrel; 4. a discharge port of the mixing barrel; 5. a blender; 6. A belt conveyor control switch; 7. a material belt conveyor; 8. a press ram; 9. an upper pressure plate; 10. a right steel plate; 11. a left steel plate jack; 12. compressing and molding the box; 13. a driving wheel; 14. a driven wheel; 15. a conveyor support; 16. filling materials; 17. compressing the block; 18. a coal mining machine; 19. a hydraulic support; 20. a lifting motor; 21. a transverse jack; 22. a post-frame conveyor; 23. a mobile platform; 24. a transversely telescopic push plate; 25. a top plate; 26. a base plate; 27. a transverse jack at the bottom of the bracket; 28. a coal wall; 29. lifting column of mobile platform

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 3 and 4, the compressed block filling system is mainly a specially-made push-in block type filling support, the front part of the support is basically consistent with the front part of a conventional support and is composed of a coal mining machine 18, a hydraulic support 19, a conveyor and other mechanisms, the rear part of the support is specially-made for pushing in blocks and mainly comprises a transverse telescopic push plate 24, a moving platform 23, a post-support conveyor 22, a moving platform lifting column 29 and other devices. The composition and parameters of the after-frame conveyor 22 are basically consistent with those of the filling and compressing block conveyor, the after-frame conveyor 22 is suspended at the rear upper part of the hydraulic support 19 and is connected with the top beam of the hydraulic support 19, the height of the after-frame conveyor is 35-45cm away from the top beam, and the filling and compressing block 17 can smoothly pass through the after-frame conveyor 22 and is prevented from being in contact collision with the top of the hydraulic support 19. The last hydraulic support 19 at the tail of the after-frame conveyor 22 is not provided with a carrier roller, two sides of the after-frame conveyor in each hydraulic support 19 are provided with driving wheels 13, the rest positions are provided with driven wheels 14, the carrier rollers of the after-frame conveyor 22 of one hydraulic support 19 form a group, and one group of carrier rollers can integrally move to the adjacent hydraulic support 19 to leave a discharge opening for filling the compressed block 17. The moving platform 23 can reciprocate, and the highest conveyer 22 lower part 10cm left and right sides after can being located the frame conveniently fills compression block 17 and can fall to the moving platform 23 and pile up in proper order, can also translate around when the moving platform 23 is located the bottom, can be with filling compression block 17 translation to collecting space area. The transverse telescopic push plate 24 can move back and forth and is responsible for pushing the stacked filling compression blocks 17 into the goaf in order.

Example two

The specific filling method is shown as the following flow:

the first process is that the filling material 16 in each material storage bin 1 is put into a material mixing barrel 3 according to a certain proportion, a certain amount of water is added, a stirrer 5 is started to fully stir the mixed material, and the mixed filling material 16 is transferred to a filling material 16 compression molding system through a belt conveyor 7. The filling material 16 in the material mixing barrel should be continuously in a stirring state, and the filling material 16 in the mixing barrel 3 should be ensured not to be lower than 1/3 of the barrel volume in the manufacturing process of the filling compression block 17, so that the subsequent working progress is prevented from being influenced.

And step two, adjusting the size of the compression molding box 12, opening a control switch 6 at the tail of the belt conveyor 7, placing the filling material 16 into the compression molding box 12 with the bottom and the peripheral steel plates fixed, starting an upper pressure head 8 of the press machine after the filling material 16 is uniformly paved in the compression molding box 12, and pushing the upper pressure head 9 to compress the filling material 16 in the compression molding box 12. The amount of pressure applied is dependent upon the overburden loading at the work surface and is typically between 80% and 110% of the overburden loading. After the filling material 16 is compressed into a high-density compressed block 17 with the height of 30-40cm, the right steel plate 10 is opened, then the left steel plate is pushed by the jack 11 behind the left steel plate to push the compressed and formed filling compressed block 17 of the filling material 16 out from the right outlet until the filling compressed block 17 is contacted with the driving wheel 13 on the conveyor bracket 15.

And step three, starting the conveying system while the compression molding of the filling material 16 is carried out, starting the motor on the driving wheel 13, and enabling the driving wheel 13 to normally rotate. After the compressed and molded filling and compressing block 17 is pushed to the driving wheel 13 on the conveyor support 15, the filling and compressing block 17 slides forwards under the pushing of the driving wheel 13 and the rotation of the driven wheel 14, after the filling and compressing block 17 is conveyed out of the distance of one conveyor support 15, the compression molding box 12 is adjusted again, and the compression molding work of the next filling and compressing block 17 is carried out.

And step four, straightening the working face filling supports 19 to enable the after-support conveyors 22 to be arranged in a straight line, connecting the supports and the supports 19 end to prevent large gaps, and reserving a discharge opening in the after-support conveyor 22 of the last support 19 at the tail of the working face machine to facilitate discharging and filling the compressed blocks 17. The filling compressed block 17 is conveyed to the after-frame conveyor 22 by the conveying system, and the sequence of unloading the filling compressed block 17 is carried out from the tail part of the working face machine to the head part. Before the filling compressed block 17 reaches the tail, the movable platform 23 is started to lift the filling compressed block to a position which is consistent with or close to the height of the after-frame conveyor 22, the filling compressed block is pushed to a discharge opening at the tail through the driving wheel 13, the driving wheel 13 on the after-frame conveyor 22 adjacent to the discharge opening pushes the filling compressed block 17 to be unloaded from the discharge opening onto the movable platform 23, then the movable platform 23 is lowered to enable the upper surface of the filling compressed block 17 on the movable platform 23 and the after-frame conveyor to be on the same horizontal plane, the unloading work of the next filling compressed block is consistent with the unloading work of the first filling compressed block 17, the filling compressed block 17 is superposed on the first filling compressed block, then the descending of the movable platform and the unloading and superposing work of the filling compressed block 17 are carried out according to the above until the movable platform descends to the bottom of the support to be contacted with the ground, the compressed block 17 is filled until it is stacked to a position close to the mining height. Then start the horizontal jack 27 at the bottom of the support, extend the moving platform 23 to the goaf, start the horizontal telescopic push pedal 24 at the same time, wait for the moving platform to move 23 to the goaf and make the compressed block 17 of filling on the moving platform 23 contact with the compressed block 17 of filling of the previous step and stop, then the horizontal telescopic push pedal 24 supports the compressed block 17 of filling on the moving platform 23, withdraw the moving platform 23, make the compressed block 17 of filling that piles up fall into the goaf, withdraw the horizontal telescopic push pedal 24, begin the filling work of the next support 19, the order of filling is gone on to the aircraft nose from the aircraft tail of working face in proper order. In order to tightly connect the filling compression blocks 17 stacked in the goaf and reduce the gaps of the stacking contact of the filling compression blocks 17, high-pressure slurry spraying (grouting) operation is carried out on the goaf if necessary so as to glue the filling compression blocks 17 into a whole.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.