CN103775024A - Fine coal slurry hole sealing method - Google Patents

Abstract

The invention discloses a hole sealing method for fine coal slurry. First, add the following components in weight percentage to the mixer: 60-70% of fine coal powder, 25-35% of cement, 4-6% of white latex, and then add water to continue Stirring, so that the ratio of water to fine coal mixture is 0.3-0.5; then, using a grouting pump to transport and press the fine coal slurry into the grouting port of the grouting sealing device. The invention uses fine coal slurry instead of cement slurry to seal holes, and the coal slurry is closely combined with the coal body without shrinkage and does not pollute the coal body. As the sealing material, fine coal powder can be obtained locally, which reduces the mining cost and is easy to prepare. After many tests, it has been confirmed that the sealing effect is very good. Moreover, after mining the coal seam, there will not be too much debris such as cement, sand and stone, and the mining purity is high, and the mining efficiency is high, which is very suitable for promotion and implementation.

Description

Hole sealing method with fine coal slurry

technical field

The invention relates to a hole sealing technology in the technical field of coal mines, in particular to a method for sealing holes with fine coal slurry.

Background technique

With the rapid development of the coal industry and the mechanization of coal mine production, the problem of dust damage in coal mine production is still severe. The incidence of pneumoconiosis among coal miners is relatively high, and coal dust explosions occur from time to time. Gas outburst is a serious natural disaster in coal mines. Seriously restrict the safe production of coal mines. The standard coal mining process needs to drain the gas from the coal seam first. Since the coal seam is buried deep underground and the pressure between the coal seams is high, it is necessary to insert a gas extraction pipe after the coal seam is drilled to extract the gas deep in the coal seam. The drainage pipe needs to be sealed during the gas extraction process. The traditional and simple method is to directly seal the hole with cement mortar, insert the gas extraction pipe into the bottom of the hole sealing section of the drilled hole, block it with wooden wedges or cotton yarn, and then seal the hole with cement. After the cement slurry is solidified, the gas can be removed. It takes a long time to seal the hole with cement mortar and inject water, the sealing effect is not good, the ability to withstand air pressure is not strong, and it consumes a lot of materials and is inconvenient to operate.

In addition, the existing joints between the cement slurry and the coal body are tight, and the cement slurry shrinks slightly after solidification, the sealing effect is poor, and the coal body will be polluted, resulting in an increase in the ash content of the coal.

Contents of the invention

The object of the present invention is to provide a multi-section bladder sealer that can effectively prevent spray holes in view of the problems and deficiencies in the prior art.

In order to achieve the above object, the following technical scheme is adopted: a fine coal slurry sealing method, first, add the following components in weight percentage to the mixer: fine coal powder 60-70%, cement 25-35%, white latex 4-6 %, stir to make a fine coal mixture; then add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3 to 0.5; The grouting and sealing device includes a gas pumping pipe, front and rear pockets and grouting pipes, the front and rear pockets are respectively fixed on the front and rear of the pipe body of the gas pumping pipe, and the grouting pipes are connected through each pocket , the grouting pipe communicates with the inner cavity of the bag through a branch pipe, and a one-way valve is installed on the branch pipe; a blast valve is arranged on the wall of the grouting pipe between two adjacent bags. The weight percentage of each component of the fine coal mixture is preferably: fine coal powder 65-70%, cement 27-30%, white latex 5-6%, more preferably: fine coal powder 68%, cement 27%, white latex 5% . The ratio of water to fine coal mixture is 0.4. At least one constraining loop is arranged on the outside of each pouch. The innermost end of the gas pumping pipe is provided with a gas collecting section, and strip-shaped or circular air holes are distributed on the gas collecting section.

Another fine coal slurry sealing method, first, add the following components by weight percentage to the mixer: fine coal powder 80-92%, white latex 8-20%, stir to make a fine coal mixture; then add water to continue stirring , so that the ratio of water to fine coal mixture is 0.3 to 0.5; stir to make fine coal slurry; then, utilize a grouting pump to transport the fine coal slurry into the grouting port of the grouting sealing device, and the grouting sealing The device includes gas pumping pipes, front and rear bladders and grouting pipes. Front and rear bladders are respectively fixed at the front and rear of the body of the gas pumping pipe, and grouting pipes are connected through each bladder, and the grouting pipes pass through branch pipes. It communicates with the inner cavity of the bag, and a one-way valve is installed on the branch pipe; a blast valve is arranged on the wall of the grouting pipe between two adjacent bags. The weight percentage of each component of the fine coal mixture is preferably: fine coal powder 90%, white latex 10%.

Beneficial effects: the present invention uses fine coal slurry instead of cement slurry to seal holes, and the coal slurry is closely combined with the coal body without shrinkage and does not pollute the coal body. Fine coal powder can be used as a sealing material, which can be obtained locally, which reduces mining costs and is easy to prepare. After many tests, it has been confirmed that the sealing effect is very good. Moreover, after mining the coal seam, there will not be too much debris such as cement, sand and gravel, and the mining purity is high, and the mining efficiency is high, which is very suitable for promotion and implementation.

Description of drawings

Fig. 1 is the appearance structure schematic diagram of the present invention;

FIG. 2 is a schematic cross-sectional structure diagram of FIG. 1 .

In the figure, the number 1 is the gas pumping pipe, 2 is the bag, 3 is the restraining collar, 4 is the grouting pipe, 5 is the blasting valve, 6 is the gas collection section, 7 is the one-way valve, 8 is the agitator, and 9 is the Grouting pump, 10 is a valve.

Detailed ways

Embodiment 1: a kind of fine coal slurry hole sealing method, at first dispose raw material: add following weight percent composition in the agitator 8 among Fig. 1: fine coal powder 60～70%, cement 25～35%, white latex 4～ 6%, stir to make a fine coal mixture; then add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5.

Secondly, as shown in Figure 1 and Figure 2, the fine coal slurry is transported and pressed into the grouting port of the grouting sealing device by using a grouting pump. Front and rear bladders 2 are sequentially fixed on the body of the gas extraction pipe 1, and the distance between the bladders 2 at both ends of the gas extraction pipe 1 is 3m to 15m. A grouting pipe 4 is connected through each bladder 2, and the grouting tube 4 communicates with the inner cavity of the bladder 2 through a branch pipe, and a one-way valve 7 is installed on the branch pipe, and the end of the grouting pipe 4 is fixed and sealed behind the In the bladder 2 on the side; a blast valve 5 is arranged on the wall of the grouting pipe between two adjacent bladders 2; The blasting valve 5 on the wall of the grouting pipe between two adjacent bladders 2 bursts immediately when the grouting pressure increases to 0.5 MPa. The space is pressurized and sealed. In addition, the innermost end of the gas pumping pipe 4 is provided with a gas collecting section 6 , and strip-shaped or circular air holes are distributed on the gas collecting section 6 .

Embodiment 2: The content is basically the same as in Example 1, and the similarities are not repeated. The difference is: the weight percentages of the components of the fine coal mixture: fine coal powder 65～70%, cement 27～30%, white latex 5～ 6%. Then add water and continue stirring, so that the ratio of water to fine coal mixture is 0.4-0.5.

Embodiment 3: content is basically the same as embodiment 2, and similarity is not repeated, and difference is: fine coal powder 68%, cement 27%, white latex 5%. Add water again and continue to stir so that the ratio of water to fine coal mixture is 0.4.

Embodiment 4: another kind of fine coal slurry sealing method, at first, add following composition by weight percentage in agitator: fine coal powder 80～92%, white latex 8～20%, stir to make fine coal mixture; Add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3 to 0.5; stir to make fine coal slurry; then, use a grouting pump to transport the fine coal slurry into the grouting port of the grouting sealing device, the The grouting and sealing device includes a gas pumping pipe, front and rear bladder bags and grouting pipes. Front and rear bladder bags are respectively fixed on the front and back of the pipe body of the gas pumping pipe, and grouting pipes are connected through each bladder bag. The grout pipe communicates with the inner cavity of the bag through a branch pipe, and a one-way valve is installed on the branch pipe; a blast valve is arranged on the grouting pipe wall between two adjacent bags.

Embodiment 5: The content is basically the same as that of Example 4, and the similarities will not be repeated. The difference is that the weight percentages of each component of the fine coal mixture are preferably: fine coal powder 90%, white latex 10%. Add water again and continue to stir so that the ratio of water to fine coal mixture is 0.4.

Claims (10)

1. a duff slurry method for sealing, is characterized in that: first, to adding following percentage by weight composition in agitator: fine breeze 60～70%, cement 25～35%, white glue with vinyl 4～6%, duff compound is made in stirring; Add water to continue to stir, making water and duff compound ratio is 0.3～0.5 again; Then, utilize grouting pump that duff slurry is carried to the grouting port that is pressed into injection hole sealing device, described injection hole sealing device comprises gas pumping pipe and forward and backward pouch and Grouting Pipe, pouch before and after being fixed with respectively before and after the body of gas pumping pipe, in each pouch, run through and be connected with Grouting Pipe, described Grouting Pipe is communicated with pouch inner chamber by arm, and on arm, one way valve is installed; On the slip casting tube wall between adjacent two pouches, be provided with explosive valve.

2. duff slurry method for sealing according to claim 1, is characterized in that: the each composition percentage by weight of described duff compound is: fine breeze 65～70%, cement 27～30%, white glue with vinyl 5～6%.

3. duff slurry method for sealing according to claim 2, is characterized in that: the each composition percentage by weight of described duff compound is: fine breeze 68%, cement 27%, white glue with vinyl 5%.

4. according to the duff slurry method for sealing described in claim 1-3 any one, it is characterized in that: water and duff compound ratio are 0.4.

5. duff slurry method for sealing according to claim 1, is characterized in that: in each pouch outside, a constraint lasso is at least set.

6. duff slurry method for sealing according to claim 1, is characterized in that: described gas pumping pipe inner terminal is provided with gas collecting segment, is distributed with bar shaped or circular air-vent on this gas collecting segment.

7. a duff slurry method for sealing, is characterized in that: first, to adding following percentage by weight composition in agitator: fine breeze 80～92%, white glue with vinyl 8～20%, duff compound is made in stirring; Add water to continue to stir, making water and duff compound ratio is 0.3～0.5 again; Duff slurry is made in stirring; Then, utilize grouting pump that duff slurry is carried to the grouting port that is pressed into injection hole sealing device, described injection hole sealing device comprises gas pumping pipe and forward and backward pouch and Grouting Pipe, pouch before and after being fixed with respectively before and after the body of gas pumping pipe, in each pouch, run through and be connected with Grouting Pipe, described Grouting Pipe is communicated with pouch inner chamber by arm, and on arm, one way valve is installed; On the slip casting tube wall between adjacent two pouches, be provided with explosive valve.

8. duff slurry method for sealing according to claim 7, is characterized in that: the each composition percentage by weight of described duff compound is preferred: fine breeze 90%, white glue with vinyl 10%.

9. according to the duff slurry method for sealing described in claim 7 or 8, it is characterized in that: water and duff compound ratio are 0.4.

10. duff slurry method for sealing according to claim 7, is characterized in that: in each pouch outside, a constraint lasso is at least set.

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