阅读说明：本技术 一种煤矿井下钻孔封孔构筑物及施工方法 (A kind of coal mine down-hole drilling sealing of hole structures and construction method ) 是由 季广瑞 王海涛 邵林金 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种煤矿井下钻孔封孔构筑物及施工方法,在煤壁上钻设孔径比封孔管大的封装孔,随后将封孔管固定安装在封装孔内,并在封孔管两端的注浆空间内安装封堵物,又在封堵物之间灌注注浆液,形成封孔构筑物。本构筑物安装可靠,密封性好,能有效防止瓦斯泄漏。同时将安装封孔管的方法提前至钻孔全部完成之前,封装孔施工完成后进行,在封孔完成后的钻孔施工中如果出现瓦斯喷涌问题,接可以通过封孔管外接抽采设备进行抽采,有效的控制钻孔瓦斯喷涌的问题。再有,施工完封装孔后安装封孔管,解决了由于钻孔过长和煤块间应力集中而导致封装孔变形,封孔管装不进封装孔的问题,降低封装孔二次施工和成为废孔的概率。(The invention discloses a kind of coal mine down-hole drilling sealing of hole structures and construction methods, the big encapsulated holes of aperture ratio hole sealing tube are drilled on coal wall, then hole sealing tube is fixedly mounted in encapsulated holes, and plug is installed in the slip casting space at hole sealing tube both ends, injection slurry is perfused between plug again, forms sealing of hole structures.The installation of this structures is reliable, and good airproof performance can effectively prevent gas leakage.The method for installing hole sealing tube is advanced to before drilling is fully completed simultaneously, it is carried out after the completion of encapsulated holes construction, it gushs problem in drilling construction after the completion of sealing of hole if there is gas, extraction can be carried out by the external extraction equipment of hole sealing tube by connecing, effective to control the problem of drilling gas is gushed.The problem of further more, installing hole sealing tube after encapsulated holes of having constructed, solving leads to encapsulate bore deformation since the too long stress between coal cinder of drilling is concentrated, and hole sealing tube dress is not into encapsulated holes, reduce the secondary construction of encapsulated holes and the probability as useless hole.)

1. a kind of coal mine down-hole drilling sealing of hole structures, it includes the encapsulated holes (1) being drilled with for gas extraction, and feature exists In: it is equipped with hole sealing tube (3) in encapsulated holes (1), forms slip casting between the inner wall of encapsulated holes (1) and the outer surface of hole sealing tube (3) Space；Plug (4) are fixedly installed in the slip casting space at both ends；Grouting Pipe (5) and return pipe (6) pass through plug (4) It puts in slip casting space；Injection slurry (7) are perfused in slip casting space.

2. a kind of coal mine down-hole drilling sealing of hole structures according to claim 1, it is characterised in that: the length of hole sealing tube (3) Degree is not less than 5m, and the closure length of plug (4) is greater than 0.5m, is less than 1m.

3. a kind of coal mine down-hole drilling sealing of hole structures according to claim 1, it is characterised in that: plug (4) is poly- Urethane foamed material.

4. a kind of coal mine down-hole drilling sealing of hole structures according to claim 1, it is characterised in that: Grouting Pipe (5) and return Slurry pipe (6) has one group or more, is evenly arranged in plug (4).

5. a kind of coal mine down-hole drilling sealing of hole structures according to claim 1, it is characterised in that: hole sealing tube (3) is close The end point of coal wall is welded with ring flange (8).

6. a kind of construction method of coal mine down-hole drilling sealing of hole structures as claimed in claims 1-5, it is characterised in that: it is wrapped Include following steps:

Step 1, the reaming bit for being greater than hole sealing tube (3) outer diameter using diameter carry out ream operation, reaming construction to scheduled depth Drilling machine stops drilling after degree, in the residue backed off after random drill bit cleared up in encapsulated holes (1)；

Hole sealing tube (3) are packed into encapsulated holes (1) by step 2；

Step 3 installs plug (4) in the slip casting space at both ends, and plug is reserved with slip casting space between (4)；

Grouting Pipe (5) and return pipe (6) are passed through plug (4) and extended in slip casting space by step 4；

Step 5 injects injection slurry (7) in slip casting space, after the return pipe (6) wait be located at top has slurries spilling, stops note Slurry；

After the completion of step 6, slip casting, a period of time is stood, after injection slurry (7) solidification, then re-starts drilling construction.

7. a kind of coal mine down-hole drilling sealing of hole construction method according to claim 6, it is characterised in that: described in step 1 Reaming bit diameter it is 0.5 to 1 times bigger than the outer diameter of hole sealing tube (3).

8. a kind of underground coal mine encapsulated holes sealing of hole construction method according to claim 6, it is characterised in that: for horizontal and Encapsulated holes (1) upward are cleaned up the residue in encapsulated holes (1) using hydraulic giant；And for encapsulated holes directed downwardly (1), it after having cleared up residue with water, also needs moisture extraction extra in hole.

9. a kind of underground coal mine encapsulated holes sealing of hole construction method according to claim 6, it is characterised in that: injection slurry (7) Setting time be slip casting after the completion of twenty four hours after.

Technical field

Field more particularly to a kind of coal mine down-hole drilling sealing of hole structures are administered the present invention relates to coal mine gas and are applied Work method.

Background technique

During coal mine gas diaster prevention and control, coal-bed gas pressure is the important parameter of gas preventing and control, and to coal seam into Row gas drainage is that prevention and treatment Gas Disaster is most effective, the most fundamental approach.Sealing of hole is gas pressure measurement and gas drainage engineering Core methed, the height of sealing quality is the key that determine gas pressure measurement accuracy and gas pumping effect.Influence envelope Hole quality it is many because being known as, mainly include sealing material, the depth of method for sealing and sealing of hole and length etc..Wherein sealing of hole side Requirement of the method all to the method flow of control and the construction of the application of sealing material, hole sealing depth and length carries out stringent handle Control, has played the height of sealing quality vital.

It is disposable to seal according to pre-determined encapsulation hole depth in current underground coal mine encapsulated holes sealing of hole work progress It fills hole construction in place, hole sealing tube is then just installed and carries out sealing of hole.In being packaged hole work progress, due to gas in coal mine There are certain pressure, will lead to gas and gush, and will cause the generation of gas accident if handling not in time.Simultaneously because coal The problems in stress collection between block, in drilling construction, encapsulated holes are easy to that deviation occurs, and hole sealing tube is caused to be installed not up, It is unable to reach expected encapsulated holes and sealing of hole effect, encapsulated holes need secondary construction or become useless hole.

Summary of the invention

The technical problem to be solved by the present invention is a kind of coal mine down-hole drilling sealing of hole structures and construction method are provided, with Solution is unable to control that gas is gushed and encapsulated holes sealing of hole is ineffective in underground coal mine encapsulated holes sealing of hole in the prior art Problem.

The technical scheme is that

A kind of coal mine down-hole drilling sealing of hole structures, it includes the encapsulated holes being drilled with for gas extraction, is equipped in encapsulated holes Hole sealing tube forms slip casting space between the inner wall of encapsulated holes and the outer surface of hole sealing tube；The fixed peace in the slip casting space at both ends Equipped with plug；Grouting Pipe and return pipe pass through plug and put in slip casting space；Slip casting is perfused with injection slurry in space.

The length of hole sealing tube is not less than 5m, and the closure length of plug is greater than 0.5m, is less than 1m.

Plug is polyurethane foam material.

Grouting Pipe and return pipe have one group or more, are evenly arranged in plug.

Hole sealing tube is welded with ring flange close to the end point of coal wall.

A kind of construction method of coal mine down-hole drilling sealing of hole structures, it the following steps are included:

Step 1, the reaming bit for being greater than sealing of hole pipe outside diameter using diameter carry out ream operation, after reaming construction to scheduled depth Drilling machine stops drilling, in the residue backed off after random drill bit cleared up in encapsulated holes；

Hole sealing tube is packed into encapsulated holes by step 2；

Step 3 installs plug in the slip casting space at both ends, and slip casting space is reserved between plug；

Grouting Pipe and return pipe are passed through plug and extended in slip casting space by step 4；

Step 5 injects injection slurry in slip casting space, after the return pipe wait be located at top has slurries spilling, stops slip casting；

After the completion of step 6, slip casting, a period of time is stood, after injection slurry solidification, then re-starts drilling construction.

The diameter of reaming bit described in step 1 is 0.5 to 1 times bigger than the outer diameter of hole sealing tube.

For encapsulated holes horizontal and upward, the residue in encapsulated holes is cleaned up using hydraulic giant；And for court Under encapsulated holes, cleared up in hole after residue, also needed moisture extraction extra in hole with water.

After the setting time of injection slurry is the twenty four hours after the completion of slip casting.

The invention has the advantages that:

A kind of coal mine down-hole drilling sealing of hole structures of the invention and construction method, hole sealing tube is installed in encapsulated holes, is being encapsulated Plug is installed in the both ends gap between hole inner wall and sealing of hole tube outer surface, and is blocked by Grouting Pipe and return pipe at two pieces Reperfusion serosity in slip casting space between object effectively blocks encapsulated holes, prevents gas drainage from not leaking.Simultaneously The method for installing hole sealing tube is advanced to before drilling is fully completed, is carried out after the completion of encapsulated holes construction, after the completion of sealing of hole It gushs problem in drilling construction if there is gas, extraction can be carried out by the external extraction equipment of hole sealing tube by connecing, effective to control The problem of drilling gas processed is gushed.Further more, installing hole sealing tube after encapsulated holes of having constructed, solve too long between coal cinder due to drilling The problem of stress is concentrated and leads to encapsulate bore deformation, and hole sealing tube dress is not into encapsulated holes reduces the secondary construction of encapsulated holes and becomes useless The probability in hole.

Detailed description of the invention

Fig. 1 is the structural diagram of the present invention.

Specific embodiment

As shown in Figure 1, a kind of coal mine down-hole drilling sealing of hole structures, it includes encapsulated holes 1, hole sealing tube 3, plug 4, note Starch pipe 5, return pipe 6 and injection slurry 7.Hole sealing tube 3, the inner wall of encapsulated holes 1 and the outer surface of hole sealing tube 3 are installed in encapsulated holes 1 Between formed slip casting space；Plug 4 is fixedly installed in the slip casting space at 3 both ends of hole sealing tube.

The plug 4 that Grouting Pipe 5 and return pipe 6 pass through outside is extended back into slip casting space, and Grouting Pipe 5 is in slip casting space Injection slurry is perfused, air extra in slip casting space is discharged, is conducive to injection slurry 7 and fills up slip casting space by return pipe 6.

To guarantee that the coal cinder as caused by drilling construction falls off problem in slip casting space, the quality of sealing of hole is influenced, therefore seal The necessary long enough of hole depth, the length of usual hole sealing tube 3 are no less than 5m.Note is being perfused in slip casting space in order to prevent simultaneously When slurries 7, for injection slurry 7 toward the problem of both ends overflow and then influence sealing of hole effect, the closure length of plug 4 is greater than 0.5m, small In 1m.

Since polyurethane and the inner wall caking property of encapsulated holes 1 are preferable, the integrality after dilatancy hardening is also preferable, can be to sealing of hole The slip casting space at 3 both ends of pipe forms effective closure, prevents the gas in coal seam from leaking from this, therefore plug 4 is poly- ammonia Ester foaming material.

Preferably, the polyurethane AB material that the plug 4 selects Langfang thousand thermal insulation material Co., Ltds of remittance to provide.

Grouting Pipe 5 and return pipe 6 have one group or more, and are evenly arranged along the surrounding of hole sealing tube 3.To ensure slip casting space energy Injection slurry 7 is completely filled out, ideal slip casting effect is reached.

The outside end point of hole sealing tube 3 is welded with ring flange 8, and ring flange 8 is used for external gas drainage equipment, complete in sealing of hole In drilling construction after, if it find that gas is gushed or revealed, extraction equipment can be connected on ring flange immediately and taken out It adopts.

A kind of construction method of coal mine down-hole drilling sealing of hole structures, it the following steps are included:

Step 1, the reaming bit for being greater than 3 outer diameter of hole sealing tube using diameter carry out ream operation, reaming construction to scheduled depth Drilling machine stops drilling afterwards, in the residue backed off after random drill bit cleared up in encapsulated holes 1；

Hole sealing tube 3 is packed into encapsulated holes 1 by step 2；

Step 3 installs plug 4 in the slip casting space at both ends, is reserved with slip casting space between plug 4；

Grouting Pipe 5 and return pipe 6 are passed through plug 4 and extended in slip casting space by step 4；

Step 5 injects injection slurry 7 in slip casting space, after the return pipe 6 wait be located at top has slurries spilling, stops slip casting；

After the completion of step 6, slip casting, a period of time is stood, after the solidification of injection slurry 7, then re-starts drilling construction.

The diameter of encapsulated holes 1 is excessive, and it will cause the wastes of plugging material；The diameter of encapsulated holes 1 is too small, then is not achieved pre- The sealing of hole effect of phase.Therefore the diameter of reaming bit described in step 1 is 0.5 to 1 times bigger than 3 outer diameter of hole sealing tube.

For encapsulated holes 1 horizontal and upward, the residue in encapsulated holes 1 is cleaned up using hydraulic giant；And for Encapsulated holes 1 directed downwardly after having cleared up residue with water also need that moisture extraction extra in hole is prevented ponding excessive, hindered Gas drainage.

It, be after injection slurry 7 completely solidification just after the setting time of injection slurry 7 is the twenty four hours after the completion of slip casting Can be carried out bore operation, otherwise because caused by the vibration of drilling construction injection slurry cracking will affect sealing of hole effect.