Rapid hole sealing and pressure measuring structure for coal seam

Abstract

The utility model discloses a quick hole sealing and pressure measuring structure for a coal seam, which comprises a pressure measuring drill hole, the pressure measuring drill hole is punched into the coal seam, and a pressure measuring pipe penetrates through the center of the pressure measuring drill hole; an isolation sleeve, a grouting section A, an injection sleeve, an isolation layer and a grouting section B are sequentially arranged between the outer portion of the pressure measuring pipe and the hole wall of the pressure measuring drill hole from bottom to top. A plurality of through injection holes are formed in the peripheral wall of the injection sleeve, and the injection sleeve is connected with the outside through an injection pipe penetrating through the isolation layer and the grouting section B and used for injecting a joint mixture into the isolation sleeve in a pressurized mode through the injection pipe from the outside. Through the arrangement of the isolation sleeve, the situation that the periphery of the pressure measuring chamber collapses and blocks the pressure measuring pipe is avoided, and a joint mixture is injected through the injection sleeve, permeates into gaps of the grouting section A, the isolation layer and the grouting section B inwards, permeates into a coal rock layer outwards through the hole wall of the pressure measuring drill hole and extends along the coal rock layer or concrete cracks till all the cracks are filled. And therefore, the conditions of collapse, shrinkage and the like of the hole wall of the subsequent pressure measurement drill hole are avoided.

Description

Technical Field

[0001] The utility model relates to a coal seam pressure measurement technology, in particular to a rapid hole sealing pressure measurement structure for a coal seam. Background Art

[0002] During coal mining, gas pressure monitoring is very important. A common practice is to drill into the coal seam, then lower the piezometer, add an isolation plate on the top of the piezometer, and then inject mortar on the upper side of the isolation plate to fill the gap between the piezometer and the borehole. However, some coal rock formations are relatively soft, with many air gaps and cracks inside, and the mortar is fixed after solidification. Because the pressure gauge or pressure sensor is installed on the top of the piezometer, once the borehole wall collapses or shrinks, it will cause an air gap between the borehole and the grouting section A and grouting section B, resulting in pressure relief. Once the pressure relief occurs, it will affect the accuracy of monitoring. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rapid hole sealing and pressure measuring structure for coal seams, so as to solve the technical problems in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A rapid hole sealing and pressure measuring structure for coal seams, comprising a pressure measuring borehole, the pressure measuring borehole is driven into the coal seam, a pressure measuring tube is inserted into the center of the pressure measuring borehole; between the outside of the pressure measuring tube and the hole wall of the pressure measuring borehole, an isolation sleeve, a grouting section A, an injection sleeve, an isolation layer and a grouting section B are sequentially arranged from bottom to top; the peripheral wall of the injection sleeve has a plurality of penetrating injection holes, the injection sleeve is connected to the outside through an injection tube penetrating the isolation layer and the grouting section B, and is used for pressurized injection of a caulking agent into the isolation sleeve through the injection tube from the outside.

[0006] Furthermore, the top end of the pressure measuring tube passes through the center of the isolation sleeve but does not exceed the bottom of the isolation sleeve, so that the internal space of the isolation sleeve serves as the pressure measuring chamber.

[0007] Furthermore, the pressure measuring tube and the isolation sleeve are welded into one body.

[0008] Furthermore, the caulking agent is Marisan, which, after being pressurized, penetrates through the injection hole of the isolation sleeve into the gaps between the hole wall of the pressure measuring borehole and the isolation sleeve, grouting section A, injection sleeve, isolation layer and grouting section B to form a sealing layer.

[0009] The advantages of the utility model are:

[0010] The utility model prevents the outer periphery of the pressure measuring chamber from collapsing and clogging the pressure measuring tube by setting an isolation sleeve, and at the same time divides the pouring of mortar into two times, adds an injection sleeve in the middle, and subsequently injects a filler through the injection sleeve, infiltrating into the gaps between the grouting section A, the isolation layer, and the grouting section B inwardly, and infiltrating into the coal rock layer through the pressure measuring borehole wall outwardly, extending along the coal rock layer or concrete cracks until all the cracks are filled, thereby preventing the subsequent collapse and shrinkage of the pressure measuring borehole wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model.

[0012] In the figure, 1-rock layer, 2-coal seam, 3-pressure measuring borehole, 4-pressure measuring tube, 5-isolation sleeve, 6-grouting section A, 61-grouting section B, 7-injection sleeve, 71-injection hole, 72-injection tube, 8-isolation layer, 9-sealing layer. DETAILED DESCRIPTION

[0013] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0014] like Figure 1 As shown:

[0015] A rapid hole sealing and pressure measuring structure for coal seams, comprising a pressure measuring borehole 3, which is driven into the coal seam, and a pressure measuring tube 4 is inserted into the center of the pressure measuring borehole 3; between the outside of the pressure measuring tube 4 and the hole wall of the pressure measuring borehole 3, an isolation sleeve 5, a grouting section A6, an injection sleeve 7, an isolation layer 8 and a grouting section B61 are arranged in sequence from bottom to top; the peripheral wall of the injection sleeve 7 has a plurality of penetrating injection holes 71, and the injection sleeve 7 is connected to the outside through an injection tube 72 penetrating the isolation layer 8 and the grouting section B61, and is used for pressurized injection of a caulking agent into the isolation sleeve 5 through the injection tube 72 from the outside.

[0016] When implementing the utility model, the pressure measuring hole 3 is first drilled through the rock layer 1 to the coal seam 2 to be pressure-measured and monitored, and then the isolation sleeve 5 and the pressure measuring tube 4 are lowered. The top of the pressure measuring tube 4 passes through the center of the isolation sleeve 5, but does not exceed the bottom of the isolation sleeve 5. The internal space of the isolation sleeve 5 is used as the pressure measuring chamber. On the one hand, the isolation sleeve 5 can prevent the outer periphery of the pressure measuring chamber from collapsing and blocking the pressure measuring tube 4. On the other hand, it can play the role of an isolation disk to prevent grouting from the upper layer from entering the pressure measuring chamber. In order to facilitate construction, the pressure measuring tube 4 and the isolation sleeve 5 are welded as one.

[0017] Then inject mortar. After the mortar is injected, the injection sleeve 7 is passed from the pressure measuring tube 4 to the surface of the mortar (a vertical insertion hole is opened in the center of the injection sleeve 7). After the mortar solidifies, a grouting section A6 is formed. Then, cotton yarn is mixed with a coagulant to fill and solidify to form an isolation layer 8. The function of the isolation layer 8 is to prevent the mortar from seeping down and clogging the injection hole 71 of the injection sleeve 7 during the second grouting process. After the isolation layer 8 is cured, the mortar is injected to the top of the pressure measuring borehole 3 again. After the mortar solidifies, a grouting section B61 is formed. Then, a sealant is pressurized and injected into the injection sleeve 7 through the injection tube 72. The sealant is Marisan.

[0018] Marisan is a low-viscosity, two-component synthetic polymer-polyimide resin material. When the resin and catalyst are mixed together, they react or expand when exposed to water. They react or foam themselves to form a multi-element dense network elastomer. When it is pushed by high pressure, it penetrates into the hole wall of the pressure measuring borehole 3 and the gap between the isolation sleeve 5, grouting section A6, injection sleeve 7, isolation layer 8 and grouting section B61 through the injection hole 71 of the injection sleeve 7 to form a sealing layer 9.

[0019] The sealing layer 9 shown in the figure is only for illustration. In fact, the sealing layer 9 is formed by penetrating various gaps and is not in a regular shape.

[0020] At the same time, the filler penetrates inwardly into the gaps between the grouting section A6, the isolation layer 8, and the grouting section B61, and penetrates outwardly into the coal rock layer through the wall of the pressure measuring borehole 3. It can extend along the coal rock layer or concrete cracks until all cracks (including cracks that are difficult to detect with the naked eye) are filled.

[0021] This avoids the subsequent collapse and shrinkage of the borehole wall of the pressure measuring borehole 3, which would cause an air gap between the grouting section A6 and the grouting section B, thereby leading to inaccurate pressure monitoring.

[0022] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A rapid sealing and pressure measuring structure for coal seams, characterized in that: It includes a pressure measuring borehole, which is driven into the coal seam, and a pressure measuring tube is inserted into the center of the pressure measuring borehole; between the outside of the pressure measuring tube and the hole wall of the pressure measuring borehole, an isolation sleeve, a grouting section A, an injection sleeve, an isolation layer and a grouting section B are arranged in sequence from bottom to top; the peripheral wall of the injection sleeve has a plurality of penetrating injection holes, and the injection sleeve is connected to the outside through an injection tube penetrating the isolation layer and the grouting section B, and is used for pressurized injection of a caulking agent into the isolation sleeve through the injection tube from the outside.

2. The rapid sealing and pressure measuring structure for coal seams according to claim 1 is characterized in that: The top end of the pressure measuring tube passes through the center of the isolation sleeve but does not exceed the bottom of the isolation sleeve, and the internal space of the isolation sleeve is used as the pressure measuring chamber.

3. The rapid sealing and pressure measuring structure for coal seams according to claim 2 is characterized in that: The pressure measuring tube and the isolation sleeve are welded into one body.

4. The rapid sealing and pressure measuring structure for coal seams according to claim 1 is characterized in that: The sealant is Marisan, which, after pressurization, penetrates through the injection hole of the isolation sleeve into the gaps between the hole wall of the pressure measuring borehole and the isolation sleeve, grouting section A, injection sleeve, isolation layer and grouting section B to form a sealing layer.

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