CN202900256U - Draining device for measuring elevation angel hole coal bed gas pressure - Google Patents

Abstract

The utility model discloses a draining device for measuring elevation angel hole coal bed gas pressure. The draining device for measuring the elevation angel hole coal bed gas pressure comprises a coal bed gas chamber and a pressure measuring pipe, wherein the top end of the pressure measuring pipe is arranged inside the coal bed gas chamber, the bottom end of the pressure measuring pipe is arranged outside a rock mass layer, and a water outlet pipe and a pressure measuring device are arranged on the pressure measuring pipe outside the rock mass layer. An inner plug is arranged at the position of an opening of the coal bed gas chamber, an outer plug is arranged at the position of an opening of a rock air chamber, a grouting pipe and a thick liquid returning pipe are communicated between the inner plug and the outer plug, and cement grout is further arranged between the inner plug and the outer plug. The water outlet pipe, the grouting pipe and the thick liquid returning pipe are all provided with valves. The draining device for measuring the elevation angel hole coal bed gas pressure is simple in structure, convenient to operate, good in hole sealing effect, low in cost, and capable of timely draining out a great deal of water which is accumulated inside a pressure measuring gas chamber when the shape of an elevation angle is measured, thereby improving the accuracy for measuring the coal bed gas pressure.

Description

A kind of jettison gear for elevation angle hole coal bed gas piezometry

Technical field

The utility model relates to the measuring technique of gas pressure in coal seam field, relates in particular to a kind of jettison gear for elevation angle hole coal bed gas piezometry.

Background technology

Coal-bed gas pressure is one of important gas parameter, and gas pressure is larger, and coal seam gas-bearing capacity is larger, and coal and gas outburst risk are also larger.Determination of coal seam gas pressure is one of important process of expiloration of coal mines and exploitation, keeps the safety in production significant to effective improvement gas, prediction outburst hazard, assurance.Its assay method has direct manometric method and method of indirectly measuring blood pressure, comprises yellow mud sealing of hole, light water mud sealing of hole, cushion rubber-mucus sealing of hole, polyurethane foam sealing of hole, the original gas bearing capacity method of extraordinary expansive cement sealing of hole and coal seam, residual gas content method etc.There is application in the many coal mining enterprises of the whole bag of tricks, but owing to not having finished product external member and the operation sequence of standard, all exist the not high problem of accuracy, and measured next gas pressure difference is very large.Determination of coal seam gas pressure requires suitable standard, when the hole coal bed gas piezometry of the elevation angle, has the problem of a draining, if water is arranged in piezometer tube, water column is high will be influential to the gas pressure measurement value, and the determination of coal seam gas pressure value is inaccurate.

Summary of the invention

The utility model purpose is to solve the aforementioned problems in the prior, and provides a kind of easy and simple to handle, measures the jettison gear that is used for accurately elevation angle hole coal bed gas piezometry.

The utility model is for achieving the above object, the technological means that adopts is, a kind of jettison gear for elevation angle hole coal bed gas piezometry, comprise coal seam air chamber and piezometer tube, it is indoor that the top of described piezometer tube is located at coal bed gas, its bottom is located at the lithosphere outside, and the piezometer tube of described lithosphere outside is provided with outlet pipe and pressure tester; Block in air chamber mouth place, described coal seam is provided with, described rock air chamber mouth place is provided with outer blocking, and is communicated with Grouting Pipe and return pipe between blocking and block in described outward, also is provided with cement grout between blocking and block in described outward; Be equipped with valve on described outlet pipe, Grouting Pipe and the return pipe.

As preferably, distance 0.5 meter, described piezometer tube top has been opened a plurality of air inlets and has been wrapped up with gauze.

As preferably, described valve is ball valve.

As preferably, described outer blocking is quick hardening cement.

The utility model beneficial effect is: simple in structure, easy to operate; Sealing of hole is effective, and cost is lower; Elevation angle type is measured, and can in time discharge a large amount of water of pressure measurement air chamber inner accumulated, thereby improve the accuracy of determination of coal seam gas pressure.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model structural representation.

Among the figure: 1, coal seam air chamber, 2, piezometer tube, 3, lithosphere, 4, valve, 5, coal seam air chamber mouth, 6, inblock 7, rock air chamber mouth, 8, block, 9, Grouting Pipe, 10, return pipe, 21, outlet pipe, 22, pressure tester, 23, air inlet outward.

The specific embodiment

A kind of jettison gear for elevation angle hole coal bed gas piezometry as shown in Figure 1, comprise coal seam air chamber 1 andpiezometer tube 2, the top of describedpiezometer tube 2 is located in the coal seam air chamber 1, its bottom is located atlithosphere 3 outsides, and thepiezometer tube 2 of describedlithosphere 3 outsides is provided withoutlet pipe 21 andpressure tester 22;Block 6 inair chamber mouth 5 places, described coal seam are provided with, described rockair chamber mouth 7 places are provided with andouter block 8, block in described 6 andblock 8 outward between be communicated with GroutingPipe 9 andreturn pipe 10, block in described 6 andblock 8 outward between also be provided with cement grout; Be equipped withvalve 4 on describedoutlet pipe 21, Grouting Pipe 9 and thereturn pipe 10.

As preferably, distance 0.5 meter, describedpiezometer tube 2 tops has been opened a plurality ofair inlets 23 and has been wrapped up with gauze.

As preferably, describedvalve 4 is ball valve.

As preferably, describedly block 8 and be quick hardening cement outward.

After the cleaning of coal seam air chamber 1 usefulness air line, connectpiezometer tube 2, GroutingPipe 9 andreturn pipe 10 are put into from rockair chamber mouth 7, after having connected pipeline,block 6 in the use and block coal seamair chamber mouth 5, with blocking 8 shutoff rockair chamber mouths 7 outward at least more than the 1m, be used for fixedlypiezometer tube 2, GroutingPipe 9 and returnpipe 10; Then inject the rapid hardening expansive cement slurries that prepare from Grouting Pipe 9.Piezometer tube 2 inlithosphere 3 outsides is provided withoutlet pipe 21 andpressure tester 22, andoutlet pipe 21 is provided with valve 4.Like this, whenpressure tester 22 readings reach certain position, slowly open thevalve 4 on theoutlet pipe 21, see if there is water out, slowly open, if there is gas to discharge, then close, the numerical value that pressure tester 22 at this moment shows is the actual numerical value of the gas pressure in the coal seam air chamber 1 at once.If there are flowing out, slowly emit water, wait water to discharge after,immediate action valve 4, the data that at this moment show also are the actual numerical values of the gas pressure in the coal seam air chamber 1.Water in the coal seam air chamber 1 can be discharged from, and so just can in time discharge a large amount of water of coal seam air chamber 1 inner accumulated, thereby improve the accuracy of determination of coal seam gas pressure.

The above; be the specific embodiment of the present utility model only, be not limited to this, anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.

Claims (4)

1. jettison gear that is used for elevation angle hole coal bed gas piezometry, it is characterized in that: comprise coal seam air chamber (1) and piezometer tube (2), the top of described piezometer tube (2) is located in the coal seam air chamber (1), its bottom is located at lithosphere (3) outside, and the outside piezometer tube (2) of described lithosphere (3) is provided with outlet pipe (21) and pressure tester (22); Described coal seam air chamber mouth (5) blocks (6) in locating to be provided with, described rock air chamber mouth (7) locates to be provided with outer block (8), block (6) in described and block outward and be communicated with Grouting Pipe (9) and return pipe (10) between (8), block (6) and block outward in described and also be provided with cement grout between (8); Be equipped with valve (4) on described outlet pipe (21), Grouting Pipe (9) and the return pipe (10).

2. the jettison gear for elevation angle hole coal bed gas piezometry according to claim 1 is characterized in that: distance 0.5 meter, described piezometer tube (2) top has been opened a plurality of air inlets (23) and has been wrapped up with gauze.

3. the jettison gear for elevation angle hole coal bed gas piezometry according to claim 1, it is characterized in that: described valve (4) is ball valve.

4. the jettison gear for elevation angle hole coal bed gas piezometry according to claim 1 is characterized in that: block (8) outside described and be quick hardening cement.

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