CN219101374U - A mine liquid nitrogen rapid freezing water sealing rescue device - Google Patents

Abstract

The utility model discloses a liquid nitrogen rapid freezing water sealing rescue device for mines. The device includes a liquid nitrogen freezing system and a grouting reinforcement system; the liquid nitrogen freezing system includes a liquid nitrogen tank, a liquid nitrogen transmission pipeline, a liquid nitrogen An injection pump and a liquid nitrogen freezing pipe; the grouting reinforcement system includes a slurry tank, a slurry transmission pipeline, a grouting pump, and a grouting pipe. The utility model adopts the combination of liquid nitrogen freezing and grouting reinforcement to carry out water sealing and emergency rescue. First, the liquid nitrogen gasifies and absorbs heat to quickly freeze the flowing water, and the temperature of the surrounding rock after liquid nitrogen freezing is low. The structure has high strength, and after being strengthened by grouting, the water gushing channel is closed, the water source is cut off, and the water sealing and emergency rescue are provided better protection.

Description

A mine liquid nitrogen rapid freezing water sealing rescue device

technical field

The utility model relates to the technical field of coal mine water disaster prevention and control, in particular to a quick freezing water sealing emergency device for mine liquid nitrogen.

Background technique

At present, with the continuous increase of mine mining depth, when the coal seam mining layer and the upper and lower rock layers are water-rich strata, mine water gushing and water inrush events are likely to be caused by mining disturbance. When water damage occurs in roadways and mining working faces, the air humidity increases, which deteriorates working conditions, affects labor productivity and the health of employees; secondly, mine water has a corrosive effect on various metal equipment, brackets, tracks, etc. Moreover, due to the existence of mine water, special pipelines, water pumps and other equipment must be installed in the production process to drain water, which increases the cost and workload. When a sudden water gushing occurs or its water volume exceeds the drainage capacity, it may cause local production stoppage, or cause well flooding, which may cause loss of national property and endanger the lives of underground operators. How to quickly and effectively block water damage to ensure safe production in mines has become a key technical problem.

Liquid nitrogen freezing is a relatively mature technology in the field of artificial freezing of rock and soil layers. The temperature of liquid nitrogen is as low as -196°C, and the freezing speed is fast, which is 10 times faster than that of the conventional ammonia-salt water cycle. After freezing, the temperature of the rock and soil layer is lower and the strength of the rock and soil layer is higher. According to the above background, liquid nitrogen rapid freezing technology can be applied to the field of coal mine water disaster prevention and control, and the water-rich coal rock section can be blocked by liquid nitrogen rapid freezing, and the plugging can be realized by grouting reinforcement, thereby eliminating the risk of mine water hazard.

For this reason, we propose a kind of liquid nitrogen fast freezing water sealing rescue device for mining.

Utility model content

The utility model proposes a mine liquid nitrogen rapid freezing water sealing rescue device, which can effectively solve the problems of mine water gushing and water inrush.

In order to achieve the above object, the utility model adopts the following technical solutions:

A mining liquid nitrogen rapid freezing water sealing emergency device, comprising: a liquid nitrogen freezing system and a grouting reinforcement system; the liquid nitrogen freezing system includes a liquid nitrogen tank, a liquid nitrogen transmission pipeline, a liquid nitrogen injection pump, and a liquid nitrogen freezing system. pipe; the grouting reinforcement system includes a slurry tank, a slurry transmission pipeline, a grouting pump, and a grouting pipe;

The liquid nitrogen tank is connected to the input end of the liquid nitrogen injection pump through the liquid nitrogen transmission pipeline, and the output end of the liquid nitrogen injection pump is connected to the liquid nitrogen freezing pipe; The slurry transmission pipeline is connected to the input end of the grouting pump, and the output end of the grouting pump is connected to the grouting pipe; liquid nitrogen freezing drilling and grouting reinforcement are provided in the water damage area Drilling, the liquid nitrogen freezing pipe is inserted into the liquid nitrogen freezing drilling, and the grouting pipe is inserted into the grouting reinforcement drilling.

Preferably, the output end of the liquid nitrogen injection pump is connected with a liquid nitrogen distribution pipe, and the output end of the liquid nitrogen injection pump is connected with the liquid nitrogen freezing pipe through the liquid nitrogen distribution pipe; the output of the grouting pump The end is connected with a grouting distribution pipe, and the output end of the grouting pump communicates with the grouting pipe through the grouting distribution pipe.

Preferably, the liquid nitrogen freezing tube is a floral tube, and the grouting tube is a floral tube.

Preferably, the liquid nitrogen freezing tube is made of stainless steel.

Preferably, the liquid nitrogen transmission pipeline is wrapped with an insulating material, and the insulating material is made of polyurethane.

Compared with the prior art, the technical progress of the utility model lies in:

1. Use liquid nitrogen gasification to absorb heat and freeze gushing water, which is fast, safe and pollution-free. After freezing, the temperature of the surrounding rock is lower, and the strength of the rock and soil layer is higher and more stable, which ensures the efficiency of production and the safety of workers.

2. After freezing with liquid nitrogen, grouting reinforcement is carried out. The grout flows, spreads, fills, and consolidates in the cracks of the rock formation, closes the water gushing channel, cuts off the water source supply, and blocks from the source, thereby eliminating the risk of mine water hazards and making mining easier. more secure and reliable.

The utility model adopts the combination of liquid nitrogen freezing and grouting reinforcement to carry out water sealing and emergency rescue. First, the liquid nitrogen gasifies and absorbs heat to quickly freeze the flowing water, and the temperature of the surrounding rock after liquid nitrogen freezing is low. The structure has high strength, and after being strengthened by grouting, the water gushing channel is closed, the water source is cut off, and the water sealing and emergency rescue are provided better protection.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device.

Among them, 1-coal seam roadway, 2-water-rich rock layer section, 3-floor rock formation, 4-liquid nitrogen freezing drilling, 5-liquid nitrogen freezing pipe, 6-grouting pipe, 7-grouting distribution pipe, 8-liquid Nitrogen distribution pipe, 9-grouting pump, 10-liquid nitrogen injection pump, 11-liquid nitrogen transmission pipeline, 12-slurry transmission pipeline, 13-liquid nitrogen tank, 14-slurry tank, 15-water damage area.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example.

As shown in Figure 1, the utility model provides a liquid nitrogen rapid freezing water sealing emergency device for mining. The liquid nitrogen rapid freezing water sealing emergency device is installed in the coal seam roadway 1 of the coal mine, including a liquid nitrogen freezing system and a grouting reinforcement system. The liquid nitrogen freezing system includes a liquid nitrogen tank 13 , a liquid nitrogen transfer pipeline 11 , a liquid nitrogen injection pump 10 and a liquid nitrogen freezing tube 5 . The grouting reinforcement system includes a grout tank 14 , a grout transmission pipeline 12 , a grouting pump 9 , and a grouting pipe 6 .

The liquid nitrogen tank 13 is connected to the input end of the liquid nitrogen injection pump 10 through the liquid nitrogen transmission pipeline 11, and the output end of the liquid nitrogen injection pump 10 is connected to the liquid nitrogen distribution pipe 8, and through the liquid nitrogen distribution pipe 8 and the liquid nitrogen freezing pipe 5 connected. A liquid nitrogen freezing borehole is opened in the water damage area 15, and a liquid nitrogen freezing pipe 5 is inserted into the liquid nitrogen freezing borehole. When the liquid nitrogen injection pump 10 starts to work, the liquid nitrogen in the liquid nitrogen tank 13 is transported to the liquid nitrogen injection pump 10 through the liquid nitrogen transmission pipeline 11, and then the liquid nitrogen is respectively transmitted to a plurality of liquid nitrogen through the liquid nitrogen distribution pipe 8. The freezing treatment is carried out in the nitrogen freezing tube 5 .

The slurry tank 14 is connected to the input end of the grouting pump 9 through the slurry transmission pipeline 12 , and the output end of the grouting pump 9 is connected to the grouting distribution pipe 7 , and communicates with the grouting pipe 6 through the grouting distribution pipe 7 . A grouting reinforcement borehole is provided in the water damage area 15, and the grouting pipe 6 is inserted into the grouting reinforcement borehole. When the grouting pump 9 starts to work, the grout in the grout tank 14 is delivered to the grouting pump 9 through the grout transmission pipeline 12, and then transferred to a plurality of grouting pipes 6 through the grouting distribution pipe 7 for grouting reinforcement.

The liquid nitrogen freezing pipe 5 and the grouting pipe 6 are flower pipes, and the pipe wall is provided with small holes at different intervals, which can realize liquid nitrogen freezing and grouting reinforcement in the whole range of water damage, and improve the efficiency of water sealing and emergency rescue , to ensure the health and safety of construction workers.

The liquid nitrogen freezing pipe 5 is made of stainless steel seamless steel pipe, which is pressure-resistant and low-temperature resistant, and can prevent weld seam cracking caused by low-temperature shrinkage. And because the temperature of liquid nitrogen is very low, the loss of cooling capacity is large, so the liquid nitrogen transmission pipeline 11 should be heat-insulated. The liquid nitrogen transmission pipeline 11 itself adopts double-layer stainless steel metal tubes, and multi-layer heat-insulating composite materials are added in the interlayer to maintain a high vacuum state. The outside is equipped with polyurethane insulation materials and sealing films, which can effectively ensure that the cooling capacity is not lost.

The implementation method of the above-mentioned mine liquid nitrogen rapid freezing water sealing rescue device comprises the following steps:

Step 1. Open holes, determine the water hazard area of the coal mine, and arrange the liquid nitrogen freezing drilling and grouting reinforcement drilling at even intervals. The lowest point of the drilling depth of the liquid nitrogen freezing drilling and grouting reinforcement drilling must exceed the water-rich rock section 2. To reach a more stable floor rock layer 3, so as to cover the entire water damage area 15, so as to produce a good freezing effect and reinforcement effect. The positions and numbers of liquid nitrogen freezing drilling and grouting reinforcement drilling can be uniformly set according to the actual conditions of different mines.

Step 2, pipe loading, after the liquid nitrogen freezing drilling and grouting reinforcement drilling are completed, the liquid nitrogen freezing pipe 5 is filled into the liquid nitrogen freezing drilling, and the grouting pipe 6 is filled into the grouting reinforcement drilling. The grouting reinforced drilling hole is sealed with a hole sealer, so that the slurry can be effectively concentrated; the filled pipeline extends through the drill hole opened through the water-rich rock layer section 2, and reaches the more stable floor rock layer 3, so that Covering the entire water damage area is beneficial to improve freezing efficiency and reinforcement effect.

Step 3, liquid nitrogen injection freezing, after the connection of the liquid nitrogen freezing system is completed, start the liquid nitrogen injection pump 10, and inject liquid nitrogen through the liquid nitrogen freezing pipe 5 into the water damage area 15 of the rock formation at the bottom of the coal seam, so as to realize the coverage of the liquid nitrogen freezing pipe 5 The flowing water in the area is quickly frozen and the surrounding rock is frozen and reinforced. The liquid nitrogen freezing pipe 5 adopts flower pipes, and small holes at different intervals are arranged on the pipe wall, which can realize spraying liquid nitrogen in the entire water damage area 15 and improve freezing efficiency. , the frozen rock formation will form a solid whole, and the strength of the surrounding rock structure is high; the whole freezing process will not produce other harmful chemical substances, which can ensure the health of construction workers and ensure that the natural environment will not be damaged, and No high economic cost is required.

Step 4, grouting reinforcement, after the rapid freezing of liquid nitrogen is completed, the grouting pump 6 is started, and the reinforcement grout is injected into the water damage area 15 of the rock formation at the bottom of the coal seam through the grouting pipe 6, so as to realize the grouting reinforcement and sealing of the water damage area 15, and realize The source of water in the flood zone 15 is blocked. The grout is mainly formed by mixing cement, fly ash, and loess. In special cases, an accelerator can be added to the grout. Grouting is carried out in the entire water damage area 15. The grout can fill the rock formation gaps to ensure the integrity of the surrounding rock. The grout flows, spreads, fills, and consolidates in the rock formation cracks to become a stone body with a certain strength and low water permeability. Cracks in the rock stratum cut off the water flow channel, consolidate the broken rocks, reduce the permeability coefficient of the surrounding rock, thereby reducing the water inflow in the water damage area 15 .

The utility model will be further described below by specific application examples:

When water inrush and water inrush accidents occur under the mine, firstly, according to the actual situation on site, determine the water damage area 15, and professional technicians will conduct positioning drilling, arrange liquid nitrogen freezing drilling and grouting reinforcement drilling at even intervals, and the lowest point of drilling depth It is necessary to go beyond the water-rich rock layer section 2 to reach the more stable floor rock layer 3 so as to fully cover the entire water damage area 15. The location and number of drill holes can be arranged according to the water inflow and the size of the water damage area to maximize the improvement of freezing efficiency and reinforcement. After the liquid nitrogen freezing drilling and grouting reinforcement drilling are completed, the liquid nitrogen freezing pipe 5 is filled into the liquid nitrogen freezing drilling, and the grouting pipe 6 is filled into the grouting reinforcement drilling; then the liquid nitrogen injection pump 10 is started, The liquid nitrogen in the liquid nitrogen tank 13 is transported to each liquid nitrogen freezing pipe 5 through the liquid nitrogen transmission pipeline 11 through the liquid nitrogen distribution pipe 8. Since the temperature of the liquid nitrogen is extremely low at -196°C, the freezing speed is fast, and it is conventional ammonia- 10 times faster than the freezing speed of brine circulation, the flowing water is quickly frozen, and the temperature of the surrounding rock and soil layers is lower, and the strength of the rock and soil layers is higher. The frozen soil formed after freezing with liquid nitrogen has a higher load capacity , play a good role in sealing and waterproofing, and provide good environmental conditions for subsequent construction operations.

After being frozen by liquid nitrogen, the grouting pump 9 is started, and the grout in the grouting tank 14 is sent to each grouting pipe 6 through the grouting distribution pipe 7 through the grouting pipeline 12 for grouting, and because the grouting pipe 6 is a flower tube, the tube wall is provided with small holes with different intervals, and the slurry can flow from the small holes to the gaps in the water damage area 15, cut off the water flow channel, consolidate the broken rock, and cut off the water supply through grouting reinforcement to realize sealing. Blocking. The utility model adopts the treatment method of combining liquid nitrogen freezing and grouting reinforcement to carry out water sealing and emergency rescue. First, the liquid nitrogen is used to quickly freeze the flowing water, and the temperature and bottom structure of the surrounding rock after liquid nitrogen freezing are high, and After freezing, the surrounding rock is well connected, and the frozen rock formation will form a solid whole to ensure the safety of the constructors. After grouting and reinforcement, the water gushing channel will be closed, the water source will be cut off, and the water sealing and rescue will be better provided. Guarantee, provide a safe construction environment for underground construction, and ensure the life, health and safety of underground employees.

Claims (5)

1. The utility model provides a mining liquid nitrogen quick freezing seals water rescue device which characterized in that includes: a liquid nitrogen freezing system and a grouting reinforcement system; the liquid nitrogen freezing system comprises a liquid nitrogen tank, a liquid nitrogen transmission pipeline, a liquid nitrogen injection pump and a liquid nitrogen freezing pipe; the grouting reinforcement system comprises a slurry tank, a slurry transmission pipeline, a grouting pump and a grouting pipe;

the liquid nitrogen tank is connected with the input end of the liquid nitrogen injection pump through the liquid nitrogen transmission pipeline, and the output end of the liquid nitrogen injection pump is communicated with the liquid nitrogen freezing pipe; the slurry tank is connected with the input end of the slurry pump through the slurry transmission pipeline, and the output end of the slurry pump is communicated with the slurry injection pipe; and a liquid nitrogen freezing drill hole and a grouting reinforcement drill hole are formed in the water damage area, the liquid nitrogen freezing pipe is inserted into the liquid nitrogen freezing drill hole, and the grouting pipe is inserted into the grouting reinforcement drill hole.

2. The mining liquid nitrogen quick freezing water sealing rescue device according to claim 1, wherein the output end of the liquid nitrogen injection pump is connected with a liquid nitrogen distributing pipe, and the output end of the liquid nitrogen injection pump is communicated with the liquid nitrogen freezing pipe through the liquid nitrogen distributing pipe; the output end of the grouting pump is connected with a grouting distributing pipe, and the output end of the grouting pump is communicated with the grouting pipe through the grouting distributing pipe.

3. The mining liquid nitrogen quick freezing water sealing rescue device according to claim 1, wherein the liquid nitrogen freezing pipe is a flower pipe, and the grouting pipe is a flower pipe.

4. The mining liquid nitrogen quick freezing water sealing rescue device according to claim 1, wherein the liquid nitrogen freezing pipe is made of stainless steel.

5. The mining liquid nitrogen quick freezing water sealing rescue device according to claim 1, wherein a heat insulation material is wrapped outside the liquid nitrogen transmission pipeline, and the heat insulation material is made of polyurethane.

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