Grouting pouring process and pouring device thereof

Abstract

The invention discloses a grouting pouring process and a pouring device thereof, and relates to the pouring field. The pouring device comprises a drilling column, a grouting port is provided at the top of the drilling column, a grouting pipe is provided at the middle of the drilling column, a drill bit is fixedly connected to the bottom of the drilling column, a grouting port is provided on the surface array of the grouting pipe, a movable groove is provided at the front end of the grouting port, the size of the movable groove is larger than the grouting port, and the grouting port is located at the center of the movable groove, a limited baffle is movably connected in the movable groove, a movable rotating shaft is fixedly connected at the top of the movable groove, the limited baffle is sleeved on the surface of the movable rotating shaft, and the limited baffle is rotatably connected to the grouting pipe through the movable rotating shaft. The invention arranges a limited baffle on the surface of the grouting pipe, and after the grouting pipe goes deep into the ground, grouting is injected into the grouting pipe, and the slurry pushes the limited baffle to open, and after the grouting is completed, the limited baffle is closed under the pressure of the pressure rod and the outside world, effectively preventing the slurry from flowing back.

Description

Technical Field

[0001] The invention relates to the field of casting, in particular to a grouting casting process and a casting device thereof. Background Art

[0002] Coal is an important basic energy and raw material in my country. The sustainable and healthy development of the coal industry has made a significant contribution to the development of the national economy. In order to adapt to the development of the economic situation and ensure energy demand, the country has invested in the construction of a number of large mines on the one hand, and on the other hand to improve the production capacity of existing mines. The improvement of the information level of underground machinery provides the necessary conditions for improving the production capacity of mines under complex geological conditions. Reliable technical support is particularly important to achieve safe and efficient mines. Reasonable design and scientific coal mining are the inevitable trend to achieve safe and efficient production in coal mines. However, various safety accidents frequently occur in coal mines in my country, which has a great impact on the development of my country's national economy and caused huge economic losses.

[0003] In order to control the occurrence of coal mining roof accidents directly covering the collapse zone, mining engineers began to practice the use of underground layer drilling pre-grouting to reinforce the roof, and the grouting material used is generally cement slurry. At the same time, grouting is generally carried out after the underground working face system is formed, and a high-level drilling site is constructed in the wind tunnel, and then the layer drilling along the coal seam roof direction is constructed in the high-level drilling site for grouting. Although it has a certain reinforcement effect, the cement slurry diffuses unevenly under pressureless conditions. After grouting, the slurry is prone to backflow and cannot cover a large area. It is also affected by the complex on-site working environment, the small diffusion radius, the large amount of drilling work, and the high grouting cost, which seriously affects the succession of the working face and safe and efficient mining. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above background technology, the purpose of the present invention is to provide a grouting pouring process and a pouring device thereof. The present invention provides a limit baffle on the surface of the grouting pipe. After the grouting pipe goes deep into the ground, grouting is injected into the grouting pipe, and the slurry pushes the limit baffle to open. After the grouting is completed, the limit baffle is closed under the pressure of the pressure rod and the outside world, effectively preventing the slurry from flowing back.

[0005] At the same time, when the present invention is used, by using a slurry mixed with cement: fly ash: water in a ratio of 1:4:5, the slurry can diffuse within a range of 40 to 50 m within 10 hours, thereby improving the diffusion effect of the slurry, facilitating large-area coverage, and reducing grouting costs.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A grouting device comprises a drilling column, a grouting port is provided on the top of the drilling column, a grouting pipe is provided in the middle of the drilling column, and a drill bit is fixedly connected to the bottom of the drilling column;

[0008] The surface array of the grouting pipe is provided with a slurry outlet, and a movable groove is provided at the front end of the slurry outlet. The size of the movable groove is larger than the slurry outlet, and the slurry outlet is located at the center of the movable groove;

[0009] A limit baffle is movably connected in the movable groove, a movable rotating shaft is fixedly connected to the top of the movable groove, the limit baffle is sleeved on the surface of the movable rotating shaft, and the limit baffle is rotatably connected to the grouting pipe through the movable rotating shaft.

[0010] Furthermore, an iron block is fixedly connected to the inner wall of one end of the limit baffle away from the movable rotating shaft, an electromagnetic block matching the iron block is arranged at the bottom of the inner cavity of the movable groove, and the bottom of the limit baffle is fixedly connected to the grouting pipe through the electromagnetic block.

[0011] Furthermore, limiting grooves are provided on both sides of the movable groove and the side walls of the grouting pipe, and a pressure rod is arranged in the limiting groove, one end of the pressure rod is tightly attached to the surface of the limiting baffle, a fixed rotating shaft is arranged in the middle of the pressure rod, and the pressure rod is rotatably connected to the grouting pipe through the fixed rotating shaft.

[0012] Furthermore, a return spring is arranged in the limit groove at one end of the pressure rod away from the limit baffle, and the end of the pressure rod away from the limit baffle is connected to the grouting pipe through the return spring.

[0013] A grouting pouring process, comprising:

[0014] 1. Installation and commissioning of grouting equipment;

[0015] 2. Drill a hole and conduct a water injection test. Fill it with clean water before grouting to obtain the water injection volume;

[0016] 3. Screen the grouting materials to make slurry, and conduct solidification test on the slurry;

[0017] 4. Flush the grouting holes, measure the water level, and drill the exploratory holes;

[0018] 5. Grouting into the hole;

[0019] 6. After each stage of grouting, ensure that the entire grouting ground system is clean.

[0020] Furthermore, the spacing between the grouting holes obtained by drilling in step 2 is 80-100m.

[0021] Furthermore, the ratio of the slurry in step three is cement: fly ash: water is 1:4:5.

[0022] Furthermore, in step five, the grouting is initially performed by stopping the grouting at the hole and performing a static pressure downward grouting method, and in the middle and late stages, the grouting is performed by stopping the grouting at the hole and placing a grouting pipe downward to perform grouting in the grouting section.

[0023] Furthermore, the grouting ground system in step six includes a mixing tank, a mixer, a suction pipe, a grouting pump, and a grouting pipeline.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention provides a limited baffle on the surface of the grouting pipe. After the grouting pipe goes deep into the ground, grouting is injected into the grouting pipe, and the slurry pushes the limited baffle to open. After the grouting is completed, the limited baffle is closed under the pressure of the pressure rod and the outside world, effectively preventing the slurry from flowing back.

[0026] 2. When the present invention is used, by using a slurry mixed with cement, fly ash and water in a ratio of 1:4:5, the slurry can diffuse within a range of 40 to 50 m within 10 hours, thereby improving the diffusion effect of the slurry, being beneficial to large-area coverage, and reducing the grouting cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is a cross-sectional view of the limit baffle of the present invention;

[0030] Figure 3 is a cross-sectional view of a compression rod of the present invention;

[0031] Figure 4 is the diffusion distance of the slurry at different viscosities;

[0032] Figure 5 is the slurry diffusion distance at different slurry viscosities at t = 21600s;

[0033] Figure 6 It is the slurry diffusion distance at different grouting pressures t=21600s.

[0034] In the figure: 1. drilling column; 2. grouting port; 3. grouting pipe; 4. drill bit; 5. grouting port; 6. movable groove; 7. limit baffle; 8. movable rotating shaft; 9. pressure rod; 10. fixed rotating shaft; 11. reset spring; 12. iron block; 13. electromagnetic block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] A grouting device, such as Figure 1 As shown, it comprises a drilling column 1, a grouting port 2 is opened at the top of the drilling column 1, a grouting pipe 3 is arranged in the middle of the drilling column 1, and a drill bit 4 is fixedly connected to the bottom of the drilling column 1.

[0038] like Figure 2 and 3 As shown, the surface array of the grouting pipe 3 is provided with a slurry outlet 5, and the front end of the slurry outlet 5 is provided with a movable groove 6, the size of the movable groove 6 is larger than the slurry outlet 5, and the slurry outlet 5 is located at the center of the movable groove 6.

[0039] A limit baffle 7 is movably connected in the movable groove 6, a movable shaft 8 is fixedly connected to the top of the movable groove 6, the limit baffle 7 is sleeved on the surface of the movable shaft 8, and the limit baffle 7 is rotatably connected to the grouting pipe 3 through the movable shaft 8.

[0040] An iron block 12 is fixedly connected to the inner wall of one end of the limit baffle 7 away from the movable rotating shaft 8, and an electromagnetic block 13 matching the iron block 12 is arranged at the bottom of the inner cavity of the movable groove 6. The bottom of the limit baffle 7 is fixedly connected to the grouting pipe 3 through the electromagnetic block 13. The limit baffle 7 flips over in the movable groove 6, and is adsorbed on the surface of the iron block 12 by the electromagnetic block 13, so that the limit baffle 7 seals the slurry outlet 5. When the grouting pipe 3 goes deep into the ground, slurry is filled into the grouting pipe 3, the electromagnetic block 13 is powered off, and the limit baffle 7 flips outward under the pressure of the slurry to complete the grouting.

[0041] Limiting grooves are provided on both sides of the movable groove 6 and the side walls of the grouting pipe 3, and a pressure rod 9 is arranged in the limiting groove. One end of the pressure rod 9 is tightly attached to the surface of the limiting baffle 7, and a fixed rotating shaft 10 is arranged in the middle of the pressure rod 9, and the pressure rod 9 is rotatably connected to the grouting pipe 3 through the fixed rotating shaft 10.

[0042] The pressure rod 9 is away from one end of the limit baffle 7 and a return spring 11 is arranged in the limit groove. The end of the pressure rod 9 away from the limit baffle 7 is connected to the grouting pipe 3 through the return spring 11. When the limit baffle 7 flips outward, it will drive the pressure rods 9 on both sides to rotate. At the same time, the pressure rod 9 will squeeze the return spring 11. After the grouting is completed, the limit baffle 7 will flip inward under the elastic force of the return spring 11 and the external pressure. At the same time, the electromagnetic block 13 is energized again, so that the limit baffle 7 can seal the slurry outlet 5 to prevent the slurry from flowing back.

[0043] A grouting pouring process, comprising:

[0044] 1. Installation and commissioning of grouting equipment;

[0045] 2. Drill holes and conduct water injection test. Fill with clean water before grouting, and stabilize for more than 60 minutes.

[0046] Obtain the water injection volume; calculate the unit water absorption and water conductivity in combination with the water level in the hole before grouting, providing a basis for determining the slurry concentration, pump pressure, and pump volume;

[0047] 3. Screen the grouting materials to make slurry and conduct solidification test on the slurry. Before grouting, laboratory tests must be conducted on the material ratio, initial setting time, stone rate, stone body strength, etc. of the grouting, in order to select the material selection and ratio with a long initial setting time, high stone rate and moderate solidification strength; reduce the water separation rate of the slurry as much as possible to reduce the risk of secondary water damage;

[0048] 4. Rinse the grouting holes, measure the water level, and drill holes to ensure that there is no collapse or block drop in the grouting section;

[0049] 5. Grouting into the hole. To achieve the ideal grouting effect, first inject thin slurry, and then slowly reduce the water-cement ratio and increase the slurry specific gravity according to the injection situation. At the same time, send a special person to contact the mine to keep track of the underground water discharge and water quality changes at any time, report in time, and make detailed records;

[0050] 6. After each stage of grouting, ensure that the entire grouting ground system is clean.

[0051] The spacing between the grouting holes obtained by drilling in step 2 is 80-100m.

[0052] The slurry ratio in step three is cement: fly ash: water (1:4:5).

[0053] In step five, the initial grouting method is to stop the grouting at the hole and perform static pressure downward grouting. In the middle and late stages, the grouting is stopped at the hole and the grouting pipe is placed down to the grouting section. The grouting time is about 6 hours.

[0054] The grouting ground system in step six includes a mixing tank, a mixer, a suction pipe, a grouting pump, and a grouting pipeline.

[0055] Effect of slurry viscosity on diffusion distance:

[0056] The grouting pressure P0 was selected as 4 MPa, the water viscosity was selected as 0.001 Pa.s, and the slurry viscosities were selected as 0.002 Pa.s, 0.004 Pa.s, 0.006 Pa.s, 0.008 Pa.s, and 0.01 Pa.s as research variables to determine the effect of viscosity on the slurry diffusion distance. The specific results are as follows: Figure 4 shown.

[0057] Depend on Figure 4 It can be seen that under a fixed grouting pressure, the slurry diffusion distance decreases as the viscosity of the slurry increases, and the curve changes in an upward convex shape. The diffusion rate of the slurry decreases with time, which is specifically manifested as an increase in the diffusion distance with time. The smaller the growth rate, the smaller it becomes, and finally tends to be stable. This phenomenon is more obvious when the viscosity value is larger. When the slurry ratio is cement: fly ash: water is 1:4:5, the viscosity of the slurry is 0.004Pa.s. It can be seen from the above figure that when the slurry viscosity is 0.004Pa.s, when the grouting time is about 6 hours, the slurry diffusion distance reaches 40-50m.

[0058] The relationship between diffusion distance, grouting pressure and slurry viscosity,

[0059] The relationship between the slurry diffusion distance, viscosity and grouting pressure 6 hours after grouting is taken, and the relationship between the slurry diffusion distance, slurry viscosity and grouting pressure at this moment is expressed by a line graph.

[0060] Depend on Figure 5 It can be seen that the diffusion distance of the slurry decreases with the increase of viscosity. When the slurry viscosity is less than 0.04, the decrease is large, and the change of slurry viscosity will cause a large change in the diffusion distance. When the viscosity is greater than 0.04, the decrease becomes smaller, and the change of slurry viscosity has little effect on the diffusion distance. Combined with the strength requirements of the rock mass after grouting, the slurry viscosity is selected as 0.004Pa.s.

[0061] Depend on Figure 6 It can be seen that the slurry diffusion distance is almost a straight line with the increase of grouting pressure. The greater the grouting pressure, the greater the slurry diffusion distance. This shows that the grouting pressure satisfies a linear relationship within 1-4MPa and is positively correlated. Based on the above conclusions, when the slurry viscosity is 0.004Pa.s and the grouting pressure is 8MPa, the slurry diffusion range is 6 hours. The slurry diffusion range can be used to guide the drilling arrangement. According to the slurry diffusion range of 40-50m, the grouting drilling spacing should be 80-100m.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A grouting device, comprising a drilling column (1), characterized in that: The top of the drilling column (1) is provided with a grouting port (2), the middle of the drilling column (1) is provided with a grouting pipe (3), and the bottom of the drilling column (1) is fixedly connected with a drill bit (4); The surface array of the grouting pipe (3) is provided with slurry outlets (5), the front end of the slurry outlets (5) is provided with movable grooves (6), the size of the movable grooves (6) is larger than the slurry outlets (5), and the slurry outlets (5) are located at the center of the movable grooves (6); A limit baffle (7) is movably connected in the movable groove (6), a movable rotating shaft (8) is fixedly connected to the top of the movable groove (6), the limit baffle (7) is sleeved on the surface of the movable rotating shaft (8), and the limit baffle (7) is rotatably connected to the grouting pipe (3) via the movable rotating shaft (8); The steps of grouting and pouring using the grouting and pouring device are as follows:

1. Installation and commissioning of grouting equipment; 2. Drill a hole and conduct a water injection test. Fill it with clean water before grouting to obtain the water injection volume; 3. Screen the grouting materials to make slurry, and conduct solidification test on the slurry; 4. Flush the grouting holes, measure the water level, and drill the exploratory holes; 5. Grouting into the hole; 6. After each stage of grouting, ensure that the entire grouting ground system is clean; The spacing between the grouting holes obtained by drilling in step 2 is 80-100m; The ratio of the slurry in step 3 is 1:4:5 of cement:fly ash:water; In the step 5, the grouting is initially performed by the hole stop grouting and static pressure downward grouting method, and in the middle and late stages, the hole stop grouting and the lower grouting pipe are used to grout the grouting section.

2. A grouting device according to claim 1, characterized in that: An iron block (12) is fixedly connected to the inner side wall of one end of the limit baffle (7) away from the movable rotating shaft (8), an electromagnetic block (13) matching with the iron block (12) is arranged at the bottom of the inner cavity of the movable groove (6), and the bottom of the limit baffle (7) is fixedly connected to the grouting pipe (3) through the electromagnetic block (13).

3. A grouting device according to claim 1, characterized in that: Limiting grooves are provided on both sides of the movable groove (6) and on the side walls of the grouting pipe (3), a pressure rod (9) is arranged in the limiting groove, one end of the pressure rod (9) is closely attached to the surface of the limiting baffle (7), a fixed rotating shaft (10) is arranged in the middle of the pressure rod (9), and the pressure rod (9) is rotatably connected to the grouting pipe (3) via the fixed rotating shaft (10).

4. A grouting pouring device according to claim 3, characterized in that: The end of the pressure rod (9) away from the limiting baffle (7) is provided with a return spring (11) in the limiting groove, and the end of the pressure rod (9) away from the limiting baffle (7) is connected to the grouting pipe (3) via the return spring (11).

5. A grouting device according to claim 1, characterized in that: The grouting ground system in step six includes a mixing tank, a mixer, a suction pipe, a grouting pump, and a grouting pipeline.

Images