Device and method for synergistically repairing rock fractures through microorganisms and active magnesium oxide

Abstract

The invention discloses a device and a method for cooperatively repairing rock fractures through microorganisms and active magnesium oxide, belongs to the technical field of rock fracture repairing, and solves the problems of complicated grouting operation and low grouting efficiency of a traditional grouting mode during rock fracture repairing. The device comprises a grouting cylinder, and a material mixing cavity and a grouting cavity are formed in the grouting cylinder; the mixing cavity and the grouting cavity are separated through an opening and closing mechanism. The end part of the grouting cavity is connected with a grouting head; a power motor is arranged in the mixing cavity, and an output shaft of the power motor is in transmission connection with a transmission shaft assembly; the transmission shaft assembly is connected with the stirring blades in the material mixing cavity and the grouting blades in the grouting cavity. According to the invention, the transmission shaft assembly drives the stirring blades to rotate to stir and mix raw materials; the grouting blade drives the grout to be extruded out of the grouting head and injected into rock cracks; according to the design, the stirring function and the grouting function are integrated, stirred grout can be rapidly squeezed out through the grouting opening, the grouting process is simplified, and the repairing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rock fissure repair, and in particular to a device and method for repairing rock fissures by using microorganisms and active magnesium oxide in a coordinated manner. Background Art

[0002] The cement production process usually emits a large amount of carbon dioxide, which triggers the greenhouse effect and further leads to adverse phenomena such as ocean acidification and ecosystem imbalance. In order to reduce carbon emissions, active magnesium cement (RMC) materials with carbon fixation ability have received widespread attention. Its carbon fixation process is mainly divided into two steps. Magnesium oxide first reacts with water to form brucite (magnesium hydroxide), and then reacts with carbon dioxide to form hydrated magnesium carbonate products, such as MgCO3·3H2O, Mg5(CO3)4(OH)2·5H2O, Mg5(CO3)4(OH)2·4H2O, etc. In addition, the hydrated magnesium oxide product generated by active magnesium oxide has higher strength, and sufficient carbon dioxide source can generate hydrated magnesium carbonate products with higher strength.

[0003] Microbial induced carbonate precipitation (MICP) technology has become a hot topic in geotechnical engineering research due to its ecological and green characteristics. The process of urease decomposing urea in the MICP process can produce carbon dioxide, which can provide a carbon dioxide source for brucite, promote the carbonation reaction of brucite, and generate high-strength hydrated magnesium carbonate. Based on this, many researchers have combined active magnesium oxide with MICP technology and cemented rock and soil particles. The results show that the strength and impermeability of the samples treated with microorganisms-active magnesium oxide are greatly improved. However, in the prior art, there are relatively few studies on using this technology to repair rock cracks; therefore, there is no special equipment for grouting the slurry of microorganisms and active magnesium oxide. The slurry can only be stirred and mixed first and then grouting is performed through a grouting pipe or other methods. This grouting method is complicated and has low grouting efficiency; and the grouting time is long, and the slurry cannot be quickly injected into the rock cracks after mixing. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a device and method for the coordinated repair of rock fissures by microorganisms and active magnesium oxide, which solves the problems of cumbersome grouting operation and low grouting efficiency in traditional grouting methods for repairing rock fissures.

[0005] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0006] A device for repairing rock fissures by synergistic use of microorganisms and active magnesium oxide comprises a grouting barrel, wherein a mixing chamber and a grouting chamber are arranged inside the grouting barrel; the mixing chamber and the grouting chamber are separated by an opening and closing mechanism; a grouting head is connected to the end of the grouting chamber; a power motor is arranged in the mixing chamber, and a transmission shaft assembly is transmission-connected to the output shaft of the power motor; the transmission shaft assembly passes through the mixing chamber and the grouting chamber in sequence, and is respectively connected to a stirring blade inside the mixing chamber and a grouting blade inside the grouting chamber.

[0007] In this scheme, active magnesium oxide and raw materials required for reinforcement are added into the mixing chamber, and the power motor drives the stirring blade to rotate through the transmission shaft assembly, and the raw materials are stirred and mixed during rotation to obtain slurry; the opening and closing mechanism is opened to transfer the slurry into the grouting chamber; driven by the grouting blades, the slurry is squeezed out of the grouting head and injected into the rock cracks; this design integrates the stirring function and the grouting function into one, and can quickly extrude the stirred slurry through the grouting port, which simplifies the grouting process and improves the repair efficiency.

[0008] Furthermore, the transmission shaft assembly includes an outer shaft and an inner shaft; the outer shaft is connected to the output shaft of the power motor through a coupling; the outer shaft is hollow inside, and the inner shaft is arranged inside the outer shaft; one end of a stop rod is fixedly connected to the inner shaft, and the other end of the stop rod is arranged through a strip hole on the outer shaft; a stop ring is arranged on the outer periphery of the outer shaft, and the stop ring drives the inner shaft to move inside the outer shaft through the stop rod; a control rod is connected to the stop ring, and the control rod is arranged through a grouting tube;

[0009] The opening and closing mechanism includes a rotating ring, and a ball is arranged in the cavity between the rotating ring and the grouting cylinder; the interior of the rotating ring is connected to the outer shaft through four brackets; an opening and closing door is arranged between every two adjacent brackets, and the four opening and closing doors are hinged on the rotating ring; one end of a steel cable is connected to each opening and closing door, and the other end of the steel cable passes through the cavity of the rotating ring and enters the bracket, and then passes through the through hole on the outer shaft to be connected to the inner shaft.

[0010] In this solution, the control rod is pushed to move, and the baffle ring moves synchronously with the control rod. At the same time, the baffle ring drives the inner shaft to move inside the outer shaft through the baffle rod. The steel cable is pulled during the movement of the inner shaft, and the force of the steel cable is transmitted to the opening and closing door to open it. After opening, the slurry inside the mixing chamber can directly flow into the grouting chamber. The four opening and closing doors are hinged on the rotating ring. Under the action of the ball, the rotating ring can drive the four opening and closing doors to rotate with the outer shaft during the mixing process to avoid motion interference.

[0011] Furthermore, the stirring blade includes a primary blade, which is fixed on the outer shaft; a secondary blade is slidably connected inside the primary blade, and a tertiary blade is slidably connected inside the secondary blade; a return spring is arranged between the tertiary blade and the primary blade, one end of the return spring is connected to the tertiary blade, and the other end of the return spring is connected to a fixed frame fixed on the primary blade; a rope is passed through the return spring, one end of the rope is connected to the tertiary blade, and the other end of the rope passes around a roller fixed on the fixed frame and is connected to the inner shaft.

[0012] In this solution, the inner shaft moves inside the outer shaft while pulling the rope, and the rope pulls the tertiary blade to slide into the secondary blade, and the secondary blade then slides into the primary blade, shrinking the volume of the entire mixing blade to a minimum; this design can reduce the resistance of the mixing blade to the slurry when the slurry flows from the mixing chamber to the grouting chamber during the grouting process; rollers are arranged on the fixed frame to reduce the friction between the rope and the fixed frame; after the grouting is completed, the secondary blade and the primary blade return to their original positions under the elastic force of the reset spring.

[0013] Furthermore, a conical funnel is arranged at one end of the rotating ring close to the mixing chamber; and a door closing spring is arranged between the conical funnel and the opening and closing door.

[0014] In this solution, the conical funnel can guide the slurry to pass through the four opening and closing doors smoothly; the door closing spring can realize the automatic closing of the opening and closing doors.

[0015] Furthermore, a motor room is separated from the mixing chamber by a partition, and the power motor is installed in the motor room; a fixed handle is provided at the bottom of the grouting barrel, a switch is provided in the fixed handle, and the switch is electrically connected to the power motor through an electric wire.

[0016] In this solution, a partition is provided to separate the power motor, which has better sealing performance.

[0017] Furthermore, a feed port is provided at the top of the grouting cylinder, and a cover is hingedly connected to the feed port.

[0018] Furthermore, a movable ring is sleeved on the grouting cylinder, a top screw is arranged on the top of the movable ring, and a movable handle is connected to the bottom of the movable ring.

[0019] In this solution, when in use, one hand can hold the fixed handle and the other hand can hold the movable handle, and both hands can cooperate to perform grouting; loosening the top screw can release the restriction on the movable ring, making it easier to adjust the position of the movable handle.

[0020] In a second aspect, the present invention provides a method for synergistically repairing rock fissures by using microorganisms and activated magnesium oxide, based on a device for synergistically repairing rock fissures by using microorganisms and activated magnesium oxide, comprising the following steps:

[0021] S1: prepare raw rock powder, urea and activated magnesium oxide;

[0022] S2: prepare bacterial solution;

[0023] S3: adding the original rock powder, active magnesium oxide and bacterial solution into the mixing chamber inside the grouting barrel, and then adding urea to stir and mix to obtain slurry;

[0024] S4: Inject slurry into rock cracks for reinforcement.

[0025] In this scheme, the raw materials are added into the mixing chamber for mixing and stirring, and the hydration reaction of the active magnesium oxide and the hydrolysis reaction of the urea are carried out simultaneously. The product of the hydration reaction, magnesium hydroxide, reacts with the carbon dioxide produced by the hydrolysis of urea to undergo a carbonation reaction to continuously generate hydrated magnesium carbonate. The product continuously cements the stone powder to produce expansion and deformation, and fills the rock cracks to achieve the effect of repairing the rock cracks. Using the original rock powder as the raw material can greatly reduce the color difference between the crack repair site and the original rock on both sides of the crack, thereby improving the repair effect.

[0026] Furthermore, S2 includes:

[0027] S201: preparing a mother bacteria liquid culture medium; dissolving yeast extract and ammonium chloride in deionized water, adding manganese sulfate solution, nickel chloride solution and sodium hydroxide solution and stirring; adding deionized water to make up to volume to obtain a mother bacteria liquid culture medium;

[0028] S202: inoculation; inoculating Bacillus pasteurianus into the mother bacteria liquid culture medium to obtain a microbial mother solution;

[0029] S203: expansion culture; placing the inoculated mother bacteria liquid culture medium in a constant temperature shaking incubator for expansion culture; after culture, selecting the bacterial solution with urease activity greater than 15 mM urea / min and OD600 greater than 1.0.

[0030] In this scheme, the bacterial solution uses Bacillus pasteurianus, which is a urease bacteria with the characteristics of strong metabolic ability, strong weather resistance and high safety.

[0031] Furthermore, S4 includes:

[0032] S401: Push the control rod, and the control rod drives the inner shaft to move inside the outer shaft;

[0033] S402: The inner shaft pulls the four doors open through the steel cables, and the slurry enters the grouting chamber from the mixing chamber;

[0034] S403: The power motor drives the grouting blades to rotate and inject slurry into the rock cracks.

[0035] In this scheme, the original rock powder, active magnesium oxide and bacterial solution are added into the grouting barrel and stirred and mixed directly. After mixing to a certain degree, the opening and closing door is opened for direct grouting, which has strong operation continuity and high grouting efficiency.

[0036] The beneficial effects of the present invention are:

[0037] The device for the synergistic repair of rock fissures by microorganisms and active magnesium oxide provided by the present invention integrates the stirring function and the grouting function. After the raw materials required for reinforcement are added into the mixing chamber and stirred and mixed to obtain slurry, the opening and closing mechanism is opened, and the slurry is injected into the rock fissure from the grouting head under the drive of the grouting blades, so that the stirred slurry can be quickly extruded through the grouting port, the interval time between the stirring and mixing operation and the grouting operation is shortened, and the repair efficiency is improved. Compared with the traditional microbial grouting method, it has the characteristic of completing the repair with one penetration, eliminating the tedious process of repeated grouting, reducing the waste of raw materials, and reducing the repair cost. The grouting blades have a transport effect on the slurry. After the slurry flows into the grouting chamber, the grouting blades squeeze the slurry into the rock fissures through the rotational transport effect, avoiding the problem that the slurry only stays at the mouth of the fissure and cannot penetrate into the depth of the fissure.

[0038] In the method for the coordinated repair of rock fissures by microorganisms and active magnesium oxide provided by the present invention, the repair raw material adopts original rock powder, which is obtained locally, reducing the repair cost, and the color difference between the repaired fissure and the original rock is small, which improves the repair effect, so that the method can be used in the field of cultural relics restoration or scenic spot fissure restoration; the active magnesium oxide is in powder form and has good dispersibility, and has a larger specific surface area, so that it can react more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of a device for repairing rock fissures by cooperating microorganisms and active magnesium oxide according to the present invention;

[0040] Figure 2 This is a schematic diagram of the internal structure of a device for the synergistic repair of rock fissures by microorganisms and active magnesium oxide according to the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the transmission shaft assembly of the present invention;

[0042] Figure 4 It is a schematic diagram of the opening and closing mechanism structure of the present invention;

[0043] Figure 5 It is a schematic diagram of the structure of the stirring blade of the present invention;

[0044] Figure 6 It is a schematic diagram of the structure of the fixing frame and the roller in the stirring blade of the present invention.

[0045] Reference numerals:

[0046] 1. Grouting cylinder; 11. Mixing chamber; 12. Grouting chamber; 13. Grouting head; 14. Partition; 15. Fixed handle; 16. Cover; 2. Opening and closing mechanism; 21. Rotating ring; 22. Ball; 23. Opening and closing door; 24. Steel cable; 25. Bracket; 26. Conical funnel; 27. Closing spring; 3. Power motor; 31. Switch; 32. Wire; 4. Transmission shaft assembly; 41. Outer shaft; 42. Inner shaft; 43. Stop rod; 44. Stop ring; 45. Control lever; 5. Mixing blade; 51. Primary blade; 52. Secondary blade; 53. Third blade; 54. Rope; 55. Reset spring; 56. Fixed frame; 57. Roller; 6. Grouting blade; 7. Moving ring; 71. Moving handle; 72. Top screw; DETAILED DESCRIPTION

[0047] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. The specific implementation of the present invention is described below to facilitate the understanding of the present invention by those skilled in the art, but it should be clear that the present invention is not limited to the scope of the specific implementation. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

[0048] like Figure 1 and Figure 2 As shown, this embodiment provides a device for repairing rock fissures by using microorganisms and active magnesium oxide, which is used for grouting inside the rock fissures when repairing the rock fissures; the device integrates stirring function and grouting function, and can quickly inject the stirred slurry into the rock fissures, shortening the interval time between the stirring and mixing operation and the grouting operation, and improving the grouting efficiency; it specifically includes:

[0049] Grouting cylinder 1, opening and closing mechanism 2, power motor 3, transmission shaft assembly 4, stirring blade 5 and grouting blade 6;

[0050] Among them, a mixing chamber 11 and a grouting chamber 12 are provided inside the grouting tube 1, and the mixing chamber 11 and the grouting chamber 12 are separated by an opening and closing mechanism 2; before grouting, the required raw materials can be added into the mixing chamber 11 for stirring and mixing; the end of the grouting chamber 12 is connected to a grouting head 13; a power motor 3 is provided in the mixing chamber 11, and a transmission shaft assembly 4 is transmission-connected to the output shaft of the power motor 3; the transmission shaft assembly 4 sequentially passes through the mixing chamber 11 and the grouting chamber 12, and is respectively connected to the stirring blade 5 inside the mixing chamber 11 and the grouting blade 6 inside the grouting chamber 12; the power motor 3 drives the stirring blade 5 to rotate through the transmission shaft assembly 4, and stirs and mixes the raw materials inside the mixing chamber during rotation.

[0051] like Figure 3As shown, the transmission shaft assembly 4 includes an outer shaft 41 and an inner shaft 42; the outer shaft 41 is connected to the output shaft of the power motor 3 through a coupling; the outer shaft 41 is hollow, and the inner shaft 42 is inserted into the outer shaft 41; one end of a baffle rod 43 is fixedly connected to the inner shaft 42, and the other end of the baffle rod 43 is inserted into the strip hole on the outer shaft 41; a baffle ring 44 is provided on the outer periphery of the outer shaft 41, and the baffle ring 44 drives the inner shaft 42 to move in the outer shaft 41 through the baffle rod 43; a control rod 45 is connected to the baffle ring 44, and the control rod 45 is inserted into the grouting tube 1; the control rod 45 is pushed to move, and the baffle ring 44 moves synchronously with the control rod 45, and at the same time, the baffle ring 44 drives the inner shaft 42 to move in the outer shaft 41 through the baffle rod 43.

[0052] like Figure 4 As shown, the opening and closing mechanism 2 includes a rotating ring 21, and a ball 22 is arranged in the cavity between the rotating ring 21 and the grouting cylinder 1; the interior of the rotating ring 21 is connected to the outer shaft 41 through four brackets 25; an opening and closing door 23 is arranged between each two adjacent brackets 25, and the four opening and closing doors 23 are hinged on the rotating ring 21; one end of a steel cable 24 is connected to each opening and closing door 23, and the other end of the steel cable 24 passes through the cavity of the rotating ring 21 and enters the bracket 25, and then passes through the through hole on the outer shaft 41 to connect with the inner shaft 42. The inner shaft 42 pulls the steel cable 24 during movement, and the force of the steel cable 24 is transmitted to the opening and closing door 23 to open it. After opening, the slurry in the mixing chamber 11 can directly flow into the grouting chamber 12; the four opening and closing doors 23 are hinged on the rotating ring 21. Under the action of the ball 22, the rotating ring 21 can drive the four opening and closing doors 23 to rotate with the outer shaft 41 during the mixing process to avoid motion interference.

[0053] like Figure 5 As shown, the stirring blade 5 includes a primary blade 51, a secondary blade 52 and a tertiary blade 53; the primary blade 51 is fixed on the outer shaft 41; the primary blade 51 is slidably connected to the secondary blade 52, and the secondary blade 52 is slidably connected to the tertiary blade 53; a return spring 55 is arranged between the tertiary blade 53 and the primary blade 51, one end of the return spring 55 is connected to the tertiary blade 53, and the other end of the return spring 55 is connected to a fixing frame 56 fixed on the primary blade 51; a rope 54 is passed through the return spring 55, one end of the rope 54 is connected to the tertiary blade 53, and the other end of the rope 54 passes around a roller 57 fixed on the fixing frame 56 and is connected to the inner shaft 42. The inner shaft 42 moves inside the outer shaft 41 while pulling the rope 54, and the rope 54 pulls the third-level blade 53 to slide inside the second-level blade 52, and the second-level blade 52 slides inside the first-level blade 51, shrinking the volume of the entire stirring blade 5 to a minimum; this design can reduce the resistance of the stirring blade 5 to the slurry when the slurry flows from the mixing chamber 11 to the grouting chamber 12 during the grouting process; Figure 6As shown, a roller 57 is provided on the fixing frame 56 to reduce the friction between the rope 54 and the fixing frame 56; after the grouting is completed, under the elastic force of the return spring 55, the secondary blade 52 and the primary blade 51 return to their original positions.

[0054] A conical funnel 26 is arranged at one end of the rotating ring 21 close to the mixing chamber 11, and the conical funnel 26 can guide the slurry to pass smoothly through the four opening and closing doors 23. A closing spring 27 is arranged between the conical funnel 26 and the opening and closing doors 23; the closing spring 27 can realize the automatic closing of the opening and closing doors 23.

[0055] The interior of the mixing chamber 11 is separated into a motor room by a partition 14, and the power motor 3 is installed in the motor room; a fixed handle 15 is provided at the bottom of the grouting cylinder 1, and a switch 31 is provided in the fixed handle 15, and the switch 31 is electrically connected to the power motor 3 through an electric wire 32.

[0056] A battery pack is disposed inside the fixed handle 15 , and the battery pack is connected to the power motor 3 to provide working power therefor.

[0057] A feed inlet is provided at the top of the grouting cylinder 1, and a cover 16 is hingedly connected to the feed inlet.

[0058] A moving ring 7 is sleeved on the grouting tube 1 , and a top screw 72 is provided on the top of the moving ring 7 ; a moving handle 71 is connected to the bottom of the moving ring 7 .

[0059] Example 2

[0060] This embodiment provides a method for cooperating with microorganisms and activated magnesium oxide to repair rock fissures based on a device for cooperating with microorganisms and activated magnesium oxide to repair rock fissures provided in Example 1, comprising the following steps:

[0061] S1: prepare raw rock powder, urea and activated magnesium oxide;

[0062] The original rock powder is crushed from the broken rocks used to repair the cracks. In order to ensure the repair efficiency and the fluidity of the slurry in the cracks, the particle size of the crushed rock powder is 10%-40% of the crack opening. The use of rock powder from rocks used to repair cracks can greatly reduce the color difference between the crack repair area and the original rocks on both sides of the cracks, thereby improving the repair effect.

[0063] S2: preparing a bacterial solution; specifically comprising:

[0064] S201: preparing a mother bacteria liquid culture medium; dissolving 2 g of yeast extract and 1 g of ammonium chloride in deionized water, and then adding 2 ml of a 0.5 g / / L manganese sulfate solution, 2 ml of a 1.2 g / L nickel chloride solution, and 3 ml of a 1 M sodium hydroxide solution and stirring; adding deionized water to make the volume to 100 ml to obtain a mother bacteria liquid culture medium;

[0065] S202: Inoculation; inoculating Bacillus pasteurianus into the mother bacteria liquid culture medium to obtain a microbial mother solution; the bacterial solution uses Bacillus pasteurianus, which is a urease bacteria with the characteristics of strong metabolic ability, strong weather resistance, and high safety;

[0066] S203: expansion culture; placing the inoculated mother bacteria liquid culture medium in a constant temperature shaking incubator at a temperature of 35°C and a rotation speed of 200 rpm for expansion culture; after culture, selecting a bacterial solution with a urease activity greater than 15 mM urea / min and an OD600 greater than 1.0.

[0067] S3: Add 200g of sieved original rock powder, 20g of active magnesium oxide and 15g of urea into the mixing chamber 11 inside the grouting barrel 1, and then add 42ml of bacterial solution; start the power motor 3, and the power motor 3 drives the stirring blade 5 to rotate through the transmission shaft assembly 4. During the rotation of the stirring blade 5, the raw materials inside the mixing chamber are stirred and mixed to obtain a slurry.

[0068] S4: injecting slurry into rock cracks for reinforcement; specifically including:

[0069] S401: Push the control rod 45, the retaining ring 44 moves synchronously with the control rod 45, and at the same time, the retaining ring 44 pushes the inner shaft 42 to move inside the outer shaft 41 through the retaining rod 43;

[0070] S402: The inner shaft 42 moves, and the four opening and closing doors 23 are opened by pulling the steel cable 24, and the slurry flows from the mixing chamber 11 into the grouting chamber 12;

[0071] S403: Loosen the control rod 45 to close the four doors 23, and then continue to add the raw materials required for preparing the slurry into the mixing chamber 11;

[0072] S404: The power motor 3 drives the grouting blade 6 to rotate, and injects the slurry into the rock fissures; at the same time, the power motor 3 also drives the stirring blade 5 to rotate, so as to achieve grouting and stirring at the same time until the repair is completed.

[0073] In this embodiment, the raw materials are added into the mixing chamber for mixing and stirring, and the hydration reaction of the active magnesium oxide and the hydrolysis reaction of the urea are carried out simultaneously. The product of the hydration reaction, magnesium hydroxide, reacts with the carbon dioxide produced by the hydrolysis of urea to undergo a carbonation reaction to continuously generate hydrated magnesium carbonate. The product continuously cements the stone powder to produce expansion and deformation, thereby filling the rock cracks to achieve the effect of repairing the rock cracks.

[0074] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the invention.

Claims

1. A device for repairing rock fissures by using microorganisms and active magnesium oxide, characterized in that: The invention comprises a grouting cylinder (1), wherein a mixing chamber (11) and a grouting chamber (12) are provided inside the grouting cylinder (1); the mixing chamber (11) and the grouting chamber (12) are separated by an opening and closing mechanism (2); and a grouting head (13) is connected to the end of the grouting chamber (12); A power motor (3) is provided in the mixing chamber (11), and a transmission shaft assembly (4) is drivingly connected to the output shaft of the power motor (3); the transmission shaft assembly (4) passes through the mixing chamber (11) and the grouting chamber (12) in sequence, and is respectively connected to a stirring blade (5) inside the mixing chamber (11) and a grouting blade (6) inside the grouting chamber (12).

2. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 1 is characterized in that: The transmission shaft assembly (4) comprises an outer shaft (41) and an inner shaft (42); the outer shaft (41) is connected to the output shaft of the power motor (3) through a coupling; the outer shaft (41) is hollow, and the inner shaft (42) is inserted into the outer shaft (41); one end of a baffle rod (43) is fixedly connected to the inner shaft (42), and the other end of the baffle rod (43) is inserted through a strip hole on the outer shaft (41); a baffle ring (44) is sleeved on the outer periphery of the outer shaft (41), and the baffle ring (44) drives the inner shaft (42) to move inside the outer shaft (41) through the baffle rod (43); a control rod (45) is connected to the baffle ring (44), and the control rod (45) is inserted through the grouting tube (1); The opening and closing mechanism (2) comprises a rotating ring (21), and a ball (22) is arranged in the cavity between the rotating ring (21) and the grouting cylinder (1); the interior of the rotating ring (21) is connected to the outer shaft (41) through four brackets (25); an opening and closing door (23) is arranged between every two adjacent brackets (25), and the four opening and closing doors (23) are hinged on the rotating ring (21); one end of a steel cable (24) is connected to each opening and closing door (23), and the other end of the steel cable (24) passes through the cavity of the rotating ring (21) and enters the bracket (25), and then passes through the through hole on the outer shaft (41) to be connected to the inner shaft (42).

3. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 2 is characterized in that: The stirring blade (5) comprises a primary blade (51), wherein the primary blade (51) is fixed on the outer shaft (41); a secondary blade (52) is slidably connected inside the primary blade (51), and a tertiary blade (53) is slidably connected inside the secondary blade; a return spring (55) is arranged between the tertiary blade (53) and the primary blade (51), one end of the return spring (55) is connected to the tertiary blade (53), and the other end of the return spring (55) is connected to a fixing frame (56) fixed on the primary blade (51); a rope (54) is passed through the return spring (55), one end of the rope (54) is connected to the tertiary blade (53), and the other end of the rope (54) is connected to the inner shaft (42) by passing through a roller (57) fixed on the fixing frame (56).

4. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 3 is characterized in that: A conical funnel (26) is arranged at one end of the rotating ring (21) close to the mixing chamber (11); and a door spring (27) is arranged between the conical funnel (26) and the opening and closing door (23).

5. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 4 is characterized in that: The interior of the mixing chamber (11) is separated into a motor room by a partition (14), and the power motor (3) is installed in the motor room; A fixed handle (15) is provided at the bottom of the grouting cylinder (1), a switch (31) is provided inside the fixed handle (15), and the switch (31) is electrically connected to the power motor (3) via an electric wire (32).

6. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 5 is characterized in that: The top of the grouting cylinder (1) is provided with a feed inlet, and a cover (16) is hingedly connected to the feed inlet.

7. The device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 4, characterized in that: The grouting cylinder (1) is sleeved with a moving ring (7), the top of the moving ring (7) is provided with a top screw (72); the bottom of the moving ring (7) is connected with a moving handle (71).

8. A method for the device for repairing rock fissures using microorganisms and active magnesium oxide according to claim 6, characterized in that: The following steps are involved: S1: prepare raw rock powder, urea and activated magnesium oxide; S2: prepare bacterial solution; S3: adding the original rock powder, active magnesium oxide and bacterial solution into the mixing chamber (11) inside the grouting cylinder (1), and then adding urea to stir and mix to obtain slurry; S4: Inject slurry into rock cracks for reinforcement.

9. The method of the device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 8, characterized in that: The S2 includes: S201: preparing a mother bacteria liquid culture medium; dissolving yeast extract and ammonium chloride in deionized water, adding manganese sulfate solution, nickel chloride solution and sodium hydroxide solution and stirring; adding deionized water to make up to volume to obtain a mother bacteria liquid culture medium; S202: inoculation; inoculating Bacillus pasteurianus into the mother bacteria liquid culture medium to obtain a microbial mother solution; S203: expansion culture; placing the inoculated mother bacteria liquid culture medium in a constant temperature shaking incubator for expansion culture; after culture, selecting the bacterial solution with urease activity greater than 15 mM urea / min and OD600 greater than 1.

0.

10. The method of the device for repairing rock fissures by using microorganisms and active magnesium oxide according to claim 9, characterized in that: The S4 includes: S401: Pushing the control rod (45), the control rod (45) drives the inner shaft (42) to move inside the outer shaft (41); S402: When the inner shaft (42) moves, the steel cable (24) pulls the four opening and closing doors (23) to open, and the slurry flows from the mixing chamber (11) into the grouting chamber (12); S403: The power motor (3) drives the grouting blade (6) to rotate, and injects slurry into the rock cracks.

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