Method for blocking flowing water through single-liquid polyurethane ground grouting

Abstract

The invention discloses a method for blocking flowing water through single-liquid polyurethane ground grouting. The method comprises the following steps that A, roadway penetrating drilling is conducted on the ground; step B, installing and lowering a drilling tool; c, pressing water before grouting; d, engine oil is poured before grouting; e, the single-liquid polyurethane grouting liquid is mixed; step F, grouting; step G, filling engine oil after grouting; and H, water pressing is conducted after grouting. The technical problem that an existing plugging material and an existing plugging method are poor in treatment effect on deep-buried tunnel flowing water can be solved, operation is convenient, the process is safe, and the effect is reliable.

Description

Technical Field

[0001] The invention relates to the technical field of deep-buried tunnel water gushing control, and more specifically to a method for sealing moving water by ground grouting with single-liquid polyurethane. Background Art

[0002] In the field of underground engineering, deep buried tunnels face complex hydrogeological conditions, especially the presence of dynamic water, which poses a huge challenge to the stability and safety of tunnels. Traditional plugging methods may have problems such as poor effect, complex construction, and high cost. With the continuous advancement of engineering construction, the demand for efficient and reliable plugging technology is becoming increasingly urgent. In the face of high-pressure dynamic water in deep buried tunnels, previous plugging materials may have defects such as long solidification time, insufficient strength, and poor impermeability, which cannot effectively control the water flow, resulting in the stability of the rock mass around the tunnel being affected, increasing construction risks and subsequent maintenance costs. In addition, the diversity and complexity of geological conditions also make it difficult for general plugging technology to adapt to various working conditions. Different rock types, degree of fracture development, and groundwater flow rate and pressure all put forward higher requirements for plugging methods and materials. In this context, the development of a new method of ground drilling and grouting to plug dynamic water in deep buried tunnels has important practical significance and engineering application value, aiming to improve the plugging effect, reduce construction difficulty and cost, and ensure the safe and stable operation of deep buried tunnels. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to provide a method for sealing moving water by single-liquid polyurethane ground grouting, so as to solve the technical problem that the existing sealing materials and sealing methods have poor effects on the treatment of moving water in deep buried tunnels. The method is easy to operate, safe in process and reliable in effect.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A method for blocking moving water by single-liquid polyurethane ground grouting comprises the following steps:

[0006] Step A: Ground construction through-tunnel drilling;

[0007] Step B, installing and lowering the drilling tool;

[0008] Step C, pressurizing water before grouting;

[0009] Step D, pouring engine oil before grouting;

[0010] Step E, mixing a single-liquid polyurethane grouting liquid;

[0011] Step F, grouting;

[0012] Step G, pouring engine oil after grouting;

[0013] Step H: pressurize water after grouting.

[0014] In the above-mentioned method for sealing moving water by grouting with single-liquid polyurethane on the ground, in step E, the method for mixing the single-liquid polyurethane grouting liquid is: adding the preheated single-component polyurethane material into a mixing bucket, adding triethanolamine and stirring thoroughly. The single-component polyurethane material and the catalyst triethanolamine are stirred and mixed on the ground, the stirring amount is controllable, and the operation is convenient.

[0015] In the above-mentioned method of sealing moving water by single-liquid polyurethane ground grouting, the single-component polyurethane material is an oil-soluble polyurethane material.

[0016] In the above-mentioned method of sealing moving water by single-liquid polyurethane ground grouting, the single-component polyurethane material is a polyurethane resin with terminal NCO groups.

[0017] In the above-mentioned method of sealing moving water with single-liquid polyurethane floor grouting, the temperature of the preheated single-component polyurethane material is 20-25°C. The reaction activity is best within this temperature range, and the foaming and expansion reaction is fastest. When the weather is cold during winter construction, the single-component polyurethane material is transported to an insulation room for preheating 2 days in advance, and then transported to the on-site grouting station after the grouting drill is lowered into place and the water pressure test is normal. This step can be ignored in summer and when the temperature is high.

[0018] In the above method of sealing moving water by grouting with single-liquid polyurethane floor, the amount of triethanolamine added is 5% to 10% of the volume of the single-component polyurethane material.

[0019] In the above method of sealing moving water by grouting with single-component polyurethane floor, the amount of triethanolamine added is 5% of the volume of the single-component polyurethane material.

[0020] The present invention selects an oil-soluble single-component polyurethane material, controls the temperature of the single-component polyurethane material to be 20-25°C, and controls the amount of triethanolamine added to prepare a single-liquid polyurethane grouting liquid, so that the single-liquid polyurethane grouting liquid can quickly foam and expand when encountering moving water in a deep-buried tunnel, and the foaming rate can reach 9.5 times. The formed foaming expansion body can greatly reduce the water-passing section of the water-gushing tunnel, thereby quickly blocking the water gushing of the deep-buried tunnel. The water-gushing reaction time of the single-component polyurethane grouting liquid can be adjusted according to the amount of triethanolamine added and the storage temperature of the single-component polyurethane material to meet the grouting time requirement.

[0021] In the above-mentioned method of single-liquid polyurethane ground grouting to block moving water, the drill tool in step B is a Φ89 drill tool, and the drill bit is a fishtail drill bit; the Φ89 drill tool is selected because, if the drill tool diameter is too large, it is difficult for the single-liquid polyurethane grouting liquid to fill the tube in the drill tool, there will be bubbles, and it is easy to form an air column, causing air blockage. At the same time, the large diameter is relatively large in flow rate, which is easy to cause insufficient foaming reaction and poor grouting and blocking effect; if the drill tool diameter is too small, the grouting pressure is too high under the same grouting amount, and it is easy to flow back and spray during pressure relief. At the same time, the small-diameter drill rod affects the drilling speed and the overall construction progress; the fishtail drill bit is used because its structure is relatively simple and will not block the drill bit. Other types of drill bits are easy to block Plug, while the fishtail drill bit impacts and rotates up and down with the drill bit to increase the diffusion range of the single-liquid polyurethane grouting liquid and the density of the stone body, and improve the grouting plugging length and quality; in step D, the engine oil injected before grouting is ordinary engine oil SAE20W-20; the injection amount of ordinary engine oil exceeds 10% of the volume of the grouting pipeline and the drill bit (at least 1.1 times the total volume of the grouting pipeline and the drill bit); in step G, the engine oil injected after grouting is also ordinary engine oil SAE20W-20; the injection amount of ordinary engine oil should exceed 40% of the total volume of the grouting pipeline and the drill bit (at least 1.4 times the total volume of the grouting pipeline and the drill bit), and then pressurized water (clean water) is used to flush the grouting pipeline and the drill bit after injection. The present invention selects SAE20W-20 type common engine oil to be injected after water is pressed before grouting, so that residual moisture in the grouting pipeline can be taken out, and compared with other effective solvents, this type of common engine oil is not only cheaper, but also can dissolve polyurethane materials well, so as to avoid the foaming expansion body formed by the reaction of residual moisture in the grouting pipeline with the single-liquid polyurethane grouting liquid to block the grouting pipeline; injecting common engine oil SAE20W-20 before water is pressed after grouting can clean the single-liquid polyurethane grouting liquid remaining in the grouting pipeline, and effectively avoid the reaction of the residual single-liquid polyurethane grouting liquid with the clean water of the flushing pipeline to block the grouting pipeline.

[0022] In the above-mentioned method for sealing moving water by grouting with single liquid polyurethane, in step F, the flow rate of the grouting pump is controlled at 180-250 L / min during grouting of the single liquid polyurethane grouting liquid. Within this flow rate range, not only can the single liquid polyurethane grouting liquid be guaranteed to fully react with water (ensuring the sufficiency of the foaming and expansion reaction and the density of the foaming and expansion body), but also it has a high water plugging efficiency, can be applied to the rapid plugging of various deep-buried cross-section tunnels, and can effectively solve the problem of difficulty in connecting the top by feeding; during grouting, the temperature of the single liquid polyurethane grouting liquid is controlled to be 20-2 5℃. At this temperature, the single-liquid polyurethane grouting fluid has the best activity in foaming and expansion reaction when it comes into contact with water, and has the best foaming and expansion properties. During the grouting period, the grouting team leader monitors the grouting pressure of the grouting pump in real time. When the grouting pressure of the grouting pump is greater than or equal to 50% of the rated grouting pressure of the grouting pump, the grouting is stopped immediately, and then the engine oil is poured in. After the grouting pressure is reduced to the normal grouting pressure, the grouting work is resumed, and this process is repeated in sequence. This can effectively avoid the risks of grouting pipe burst caused by the rapid rise in grouting pressure, and the risks of slurry reflux and spraying after the grouting is completed due to excessive grouting pressure.

[0023] In the above-mentioned method of single-liquid polyurethane ground grouting to block moving water, in step A, accurate drilling is performed by ground construction to 1m below the bottom plate of the water-gushing tunnel, the drilling deviation rate is less than or equal to 1‰, and the drilling tunnel success rate is 100%;

[0024] In step B, before the drill tool is lowered into the hole, the one-way valve is checked and cleaned, the one-way valve is installed, and the thread connection is tight; the ground end of the drill tool is connected to the grouting pipeline, and the lower part of the one-way valve of the drill tool is connected to the fishtail drill bit; the bottom of the fishtail drill bit enters the tunnel, and the drill tool is moved up and down during the grouting process based on the remaining water flow space, and the slurry does not stop when drilling, and the slurry flows into the tunnel through the fishtail drill bit by gravity;

[0025] In step C, when water is pressed before grouting, the suction port of the grouting pipeline is placed in clean water heated to 20-25°C, and water is pressed. The pump pressure of the grouting pump is less than or equal to 1MPa, the borehole is flushed, and the pumping system is checked to see if it is normal. After the water is pressed, it is left to stand for 30 minutes;

[0026] Specifically, after the Φ89 drilling tool and the one-way valve of the drilling rig are lowered, the orifice grouting device is installed to connect the high-pressure valve and the grouting pipeline; the grouting station uses heated clean water to conduct a water pressure test, and then checks the tightness of the drilling tool and the one-way valve and the water pressure of the grouting pump. If the pump pressure of the grouting pump is within 1MPa and the drilling tool is well sealed, ordinary engine oil can be injected to flush the grouting pump, the grouting pipeline and the clean water in the drilling tool above the one-way valve;

[0027] In step F, during outdoor construction in winter, the grouting mixing barrel and the grouting pipeline from the grouting pump to the drilling site are wrapped with a constant temperature heating belt for continuous heating, and are wrapped with rubber and plastic insulation cotton to ensure that the viscosity of the single-liquid polyurethane grouting liquid will not increase due to continuous cooling during the grouting process; the temperature of the mixing barrel before grouting is greater than or equal to the temperature of the single-liquid polyurethane grouting liquid;

[0028] After the ordinary engine oil is poured before injection, the single-component polyurethane material and triethanolamine are fully mixed and stirred for at least 30 seconds. When the grouting pump is able to continuously grout, the material is continuously taken and added to maintain the temperature of the single-component oil-soluble polyurethane grouting liquid, which is convenient for the grouting pump to continuously grout. The technicians check the temperature of the single-component oil-soluble polyurethane grouting liquid in the mixing barrel at any time;

[0029] In case of a sudden power outage during grouting, stop grouting immediately, place the grouting pump suction pipe immediately into the mixing barrel for storing engine oil, and pour engine oil according to the grouting pipeline and drill bit volume. After the engine oil is poured, the grouting station immediately turns off the grouting pump and starts the drilling rig at the same time to lift the drill bit 6 to 10 meters, move the drill bit at irregular intervals, and continue to pour the single-liquid polyurethane grouting fluid after the power supply is restored.

[0030] The technical solution of the present invention achieves the following beneficial technical effects:

[0031] 1. The present invention utilizes the property of a single-component polyurethane material that it rapidly foams and expands when it encounters water. By controlling the temperature of the single-component polyurethane material on site to be maintained within the range of 20 to 25°C, and adding triethanolamine as a catalyst, the material can expand and foam in a short time when it encounters moving water after mixing. The obtained expanded foam can effectively reduce the water-passing section of the deep-buried tunnel moving water, speed up the construction speed of the deep-buried tunnel water-blocking section, thereby effectively controlling the water gushing in the tunnel, and playing a role in intercepting and blocking the moving water of the deep-buried tunnel, thereby ensuring the construction safety and the stability of the tunnel structure.

[0032] 2. The present invention stores the single-component polyurethane material at 20-25°C, adds 5-10% triethanolamine by volume of the single-component polyurethane material, and completes foaming and expansion in 2-7 minutes after contacting water. By controlling the amount of triethanolamine used, the expansion and foaming time and expansion rate can be effectively controlled, so that the single-liquid polyurethane grouting liquid can quickly and effectively block the deep-buried tunnel after reaching the position of the moving water. The present invention mixes a specific single-liquid polyurethane grouting liquid, uses a Φ89 drill tool and a fishtail drill bit, and adopts the construction method of "pressing water before grouting-injecting machine oil before grouting-grouting-injecting machine oil after grouting-pressing water after grouting". At the same time, by controlling the injection amount of the machine oil before grouting and the machine oil after grouting, as well as the grouting flow rate and grouting pressure, the single-liquid polyurethane grouting liquid can quickly form a stone body with good density at the water-passing section of the deep-buried tunnel moving water, so as to achieve the purpose of blocking the moving water, while ensuring the deep-buried tunnel treatment effect, reducing its blocking construction cost.

[0033] 3. Compared with other complex sealing methods such as using traditional aggregates and single-liquid cement slurry for sealing, the method of sealing dynamic water by single-liquid polyurethane ground grouting of the present invention has the advantages of relatively simple and safe construction, and can quickly respond to and deal with water gushing problems; and this method has the advantages of low material consumption, less time consumption, fast formation of expanded foam, high controllability, high success rate of sealing and water blocking, and quick effect. It can effectively improve the sealing effect, quickly reduce the impact of disasters caused by dynamic water on deep buried tunnels, and is suitable for rapid sealing of dynamic water ground in deep buried tunnels, and rapid top connection after aggregate accumulation.

[0034] 4. The present invention adopts oil-soluble single-component polyurethane material as grouting material, presses water before grouting and then presses ordinary engine oil, presses ordinary engine oil after grouting and then presses water, and controls the injection amount of ordinary engine oil before grouting to be at least 1.1 times the volume of the grouting pipeline and drill bit, and the injection amount of ordinary engine oil after grouting to be at least 1.4 times the volume of the grouting pipeline and drill bit, which can effectively prevent the single-component polyurethane material from reacting with water and expanding to block the drill hole and the grouting pipeline.

[0035] 5. The method of the present invention for blocking dynamic water by grouting with single liquid polyurethane on the ground has broadened the materials, processes and ideas for managing water inrush in deep buried tunnels, increased selectivity, and improved the success rate of similar deep buried tunnel water hazard management. The method of the present invention is economical and practical, efficient in construction, convenient in operation, and low in economic cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of a method for sealing dynamic water by single-liquid polyurethane ground grouting in an embodiment of the present invention;

[0037] Figure 2 Operation flow chart of the method for sealing dynamic water by single-liquid polyurethane ground grouting in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The method of the present invention of single liquid polyurethane ground grouting to block moving water was tested in engineering in winter. The specific method schematic diagram is as follows Figure 1 The operation process is shown in Figure 2 , specifically including the following steps:

[0039] Step A: Drill holes through the tunnel on the ground. Figure 1 As shown, the ground construction accurately drills to 1m below the bottom plate of the water-gushing tunnel, the drilling deviation rate is no more than 1‰, and the success rate of drilling through the tunnel is 100%.

[0040] Step B, install and lower the drilling tool; this embodiment uses a Φ89 drilling tool plus a one-way valve. Before the Φ89 drilling tool is lowered into the hole, the one-way valve is checked and cleaned, the one-way valve is installed, the thread connection is tight, and the ground end of the drilling tool is connected to the grouting pipeline; the lower part of the one-way valve is connected to a fishtail drill bit, the bottom of the drill bit enters the tunnel, and the remaining water flow space is used as a reference. During the grouting process, the drilling tool moves up and down, and the slurry does not stop when drilling. The slurry flows into the tunnel through the fishtail drill bit.

[0041] Step C, pressurize water before grouting; after the drilling rig Φ89 drill bit and the one-way valve are lowered, install the orifice grouting device to connect the high-pressure valve and the grouting pipeline; after the grouting station uses heated clean water to conduct a water pressure test, check the tightness of the drill bit and the one-way valve and the water pressure of the grouting pump, and let it stand for 30 minutes after the water pressure is completed.

[0042] Step D, injecting engine oil before grouting: When the pump pressure of the grouting pump is within 1MPa and the drill is well sealed, inject ordinary engine oil to flush the grouting pump, the grouting pipeline and the water in the drill above the one-way valve. The amount of ordinary engine oil injected before injection should be 1.1 times the total volume of the grouting pipeline and the drill. The engine oil injected before grouting in this embodiment is ordinary engine oil SAE20W-20.

[0043] Step E, mixing a single-component polyurethane grouting liquid; the mixing method of the single-component polyurethane grouting liquid is: add the preheated single-component polyurethane material into a mixing bucket, add triethanolamine and stir thoroughly for 30 seconds. The single-component polyurethane material used in this embodiment is a polyurethane resin with an NCO terminal group, the preheating temperature is 20-25°C, and the amount of triethanolamine added is 5% of the volume of the single-component polyurethane material;

[0044] Since the construction in this embodiment is carried out in winter when the weather is cold, the single-component polyurethane material is transported to an insulation room for preheating 2 days in advance, and after the grouting drill is lowered into place and the water pressure test is normal, it is transported to the on-site grouting station (in other embodiments, if the construction is carried out in summer and the temperature is high, this step is ignored); the single-component polyurethane material in this embodiment and the catalyst triethanolamine are stirred and mixed on the ground, and the stirring amount is controllable, which is easy to operate.

[0045] Step F, grouting; after the above work is completed, the grouting pipe is placed in the mixing barrel for grouting, and the material is continuously taken and added when the grouting pump is required to continuously grout, so as to maintain the temperature of the single-component oil-soluble polyurethane grouting liquid, which is convenient for the grouting pump to continuously grout the liquid. The technicians check the temperature of the single-component oil-soluble polyurethane grouting liquid in the mixing barrel at any time;

[0046] In this embodiment, the flow rate of the grouting pump during grouting of the single-liquid polyurethane grouting liquid is 250L / min; the temperature of the single-liquid polyurethane grouting liquid is controlled to be 20-25°C during grouting; during grouting, the grouting team leader monitors the grouting pressure of the grouting pump in real time, and when the grouting pressure of the grouting pump is greater than or equal to 50% of the rated grouting pressure of the grouting pump, the grouting is stopped, and then the engine oil is poured, and the grouting work is resumed after the grouting pressure is reduced to the normal grouting pressure, and the process is repeated in sequence;

[0047] Since this embodiment is an outdoor construction in winter, the grouting mixing barrel and the grouting pipeline from the grouting pump to the drilling site are wrapped with a constant temperature heating belt for continuous heating, and are wrapped with rubber and plastic insulation cotton; the temperature of the mixing barrel before grouting is greater than or equal to the temperature of the single-liquid polyurethane grouting liquid;

[0048] In case of a sudden power outage during grouting, stop grouting immediately, place the grouting pump suction pipe immediately into the mixing barrel for storing engine oil, and pour engine oil according to the grouting pipeline and drill bit volume. After the engine oil is poured, the grouting station immediately turns off the grouting pump and starts the drilling rig at the same time to lift the drill bit 6 to 10 meters, move the drill bit at irregular intervals, and continue to pour the single-liquid polyurethane grouting fluid after the power supply is restored.

[0049] Step G, pouring engine oil after grouting; after the grouting is completed, the grouting pump pours ordinary engine oil after grouting, and the amount of ordinary engine oil poured after grouting is 1.4 times the total volume of the grouting pipeline and the drilling tool; the engine oil poured after grouting in this embodiment is ordinary engine oil SAE20W-20.

[0050] Step H: After grouting, pressurize water to flush the grouting pipeline and drilling tools.

[0051] The single-liquid polyurethane grouting liquid of this embodiment starts foaming and expanding reaction 2 minutes after grouting, and the reaction is completed in about 7 minutes. The foaming rate of the obtained foamed expansion body reaches 9.5 times, and the foamed expansion body has a high density, which can achieve dynamic water sealing of deep buried tunnels in a short time, and there is no blockage of grouting pipelines and drilling tools during the entire construction process.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A method for sealing moving water by single-liquid polyurethane ground grouting, characterized in that: The steps include: Step A: Ground construction through-tunnel drilling; Step B, installing and lowering the drilling tool; Step C, pressurizing water before grouting; Step D, pouring engine oil before grouting; Step E, mixing a single-liquid polyurethane grouting liquid; Step F, grouting; Step G, pouring engine oil after grouting; Step H: pressurize water after grouting.

2. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 1, characterized in that: In step E, the single-liquid polyurethane grouting liquid is mixed by adding the preheated single-component polyurethane material into a mixing bucket, and then adding triethanolamine and stirring thoroughly.

3. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 2, characterized in that: The one-component polyurethane material is an oil-soluble polyurethane material.

4. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 3 is characterized in that: The one-component polyurethane material is a polyurethane resin with a terminal NCO group.

5. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 2, characterized in that: The temperature of the preheated single-component polyurethane material is 20-25°C.

6. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 2, characterized in that: The added amount of triethanolamine is 5% to 10% of the volume of the single-component polyurethane material.

7. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 6, characterized in that: The added amount of triethanolamine is 5% of the volume of the single-component polyurethane material.

8. The method for sealing moving water by single-liquid polyurethane ground grouting according to any one of claims 1 to 7, characterized in that: The drilling tool in step B is a Φ89 drilling tool, and the drill bit is a fishtail drill bit; in step D, the engine oil injected before grouting is ordinary engine oil SAE20W-20; the injection amount of ordinary engine oil is at least 1.1 times the total volume of the grouting pipeline and the drilling tool; in step G, the engine oil injected after grouting is also ordinary engine oil SAE20W-20; the injection amount of ordinary engine oil is at least 1.4 times the total volume of the grouting pipeline and the drilling tool.

9. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 8, characterized in that: In step F, the flow rate of the grouting pump is controlled at 180-250 L / min during grouting with the single-liquid polyurethane grouting liquid; the temperature of the single-liquid polyurethane grouting liquid is controlled at 20-25° C. during grouting; during grouting, when the grouting pressure of the grouting pump is greater than or equal to 50% of the rated grouting pressure of the grouting pump, the grouting is stopped, and then the engine oil is poured, and the grouting work is resumed after the grouting pressure is reduced to the normal grouting pressure, and the process is repeated in sequence.

10. The method for sealing dynamic water by single-liquid polyurethane ground grouting according to claim 9, characterized in that: In step A, accurate drilling is performed on the ground to a point 1 m below the bottom plate of the water-gushing tunnel, and the borehole deviation rate is less than or equal to 1‰; In step B, before the drill tool is lowered into the hole, the one-way valve is checked and cleaned, the one-way valve is installed, and the thread connection is tight; the ground end of the drill tool is connected to the grouting pipeline, and the lower part of the one-way valve of the drill tool is connected to the fishtail drill bit; In step C, when water is pressed before grouting, the suction port of the grouting pipeline is placed in clean water at 20-25°C, and water is pressed. The pump pressure of the grouting pump is less than or equal to 1MPa, the borehole is flushed, and the pumping system is checked to see if it is normal. After the water is pressed, it is left to stand for 30 minutes; In step F, during outdoor construction in winter, the grouting mixing barrel and the grouting pipeline from the grouting pump to the drilling site are wrapped with a constant temperature heating belt for continuous heating, and are wrapped with rubber and plastic insulation cotton; the temperature of the mixing barrel before grouting is greater than or equal to the temperature of the single-liquid polyurethane grouting liquid; In case of a sudden power outage during grouting, stop grouting immediately, place the grouting pump suction pipe immediately into the mixing barrel for storing engine oil, and pour engine oil according to the grouting pipeline and drill bit volume. After the engine oil is poured, the grouting station immediately turns off the grouting pump and starts the drilling rig at the same time to lift the drill bit 6 to 10 meters, move the drill bit at irregular intervals, and continue to pour the single-liquid polyurethane grouting fluid after the power supply is restored.

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