Microorganism reinforcing device and method for reinforcing anti-erosion soil slope

Abstract

The invention discloses a microorganism reinforcing device and method for reinforcing an anti-erosion soil slope, belongs to the technical field of slope reinforcing, and solves the problems that only the surface layer of the slope is reinforced and the reinforcing effect of a soil body in the slope is poor in a traditional slope reinforcing mode. The grouting device specifically comprises a plurality of multi-way connectors, the multiple multi-way connectors are communicated through grout pipelines, and grouting nozzles are arranged on the grout pipelines; one multi-way connector is connected with grouting equipment; the bottom of the multi-way connector is connected with a grouting anchor pipe. According to the side slope deep reinforcement device, grouting equipment conveys grout to the multi-way connector through the grout pipeline, the grout enters the grouting anchor pipe from the multi-way connector, and deep reinforcement of a side slope is achieved; in the conveying process, the grout passes through the grouting nozzles and is sprayed out from the grouting nozzles to the surface of the slope, so that the surface layer of the slope is reinforced; the device has the function of reinforcing the soil body in the slope and the soil body on the surface layer of the slope, the reinforcing depth and the reinforcing effect of the anti-erosion soil slope can be effectively improved, and the reinforcing uniformity degree of microorganism reinforcing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of slope reinforcement, and in particular to a microbial reinforcement device and method for reinforcing an anti-erosion soil slope. Background Art

[0002] Scour and water damage is a common failure mode in slope engineering. Since slopes are often exposed to the natural environment, affected by the natural environment, especially heavy rainfall and water level fluctuations, a large amount of water flows down along the surface of the slope, carrying away a large amount of sediment, causing the surface of the slope to be eroded, further endangering the safety of the interior of the slope, and bringing major hidden dangers to the safety of the slope. In the existing treatment technology, plant slope protection and hard slope protection are mainly used, but the depth and treatment effect of plant slope protection are limited, and it cannot play a deep role in reinforcing the soil inside the slope; hard slope protection is easy to affect the ecological environment of the slope and damage the ecological balance.

[0003] Microbial induced carbonate precipitation (MICP) refers to the process in which microorganisms produce the metabolic product CO through metabolic activities. 3 2- , and under suitable environmental conditions, it reacts with the Ca 2+ The interaction forms calcium carbonate precipitation, which reinforces the surrounding soil. It has the characteristics of fast reaction speed, low environmental conditions, wide application range, and significant greenhouse gas emission reduction effect. It is widely used in many fields such as geology, civil engineering, water conservancy, and environment. As for the application of microbial induced carbonate precipitation technology in slope protection, most of them are mainly surface spraying, which can only reinforce the surface of the slope, but not the soil inside the slope. Therefore, the reinforcement depth is limited and the durability of the reinforced slope is poor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a microbial reinforcement device and method for anti-erosion soil slope reinforcement, which solves the problem that the traditional slope reinforcement method only reinforces the surface of the slope and has poor reinforcement effect on the soil inside the slope.

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

[0006] A microbial reinforcement device for anti-erosion soil slope reinforcement includes a plurality of multi-way joints, the plurality of multi-way joints are connected through slurry pipelines, and a grouting nozzle is arranged on the slurry pipeline; one of the multi-way joints is connected to a grouting device;

[0007] The bottom of the multi-way joint is connected with a grouting anchor pipe, which is buried inside the slope.

[0008] In this scheme, the grouting equipment transports the slurry to each multi-way joint through the slurry pipeline. The slurry enters the grouting anchor pipe from the bottom of the multi-way joint and is injected into the interior of the slope from the grouting anchor pipe to achieve deep reinforcement of the slope. During the transportation, the slurry passes through the grouting nozzle and is sprayed out from the grouting nozzle to the surface of the slope to reinforce the surface of the slope. This design has the functions of grouting into the interior of the slope soil and spraying onto the surface of the slope soil, which can effectively improve the reinforcement depth and reinforcement effect of the anti-erosion soil slope and improve the reinforcement uniformity of the microbial reinforcement.

[0009] Furthermore, the multi-way joint is a pagoda six-way joint, which has six connecting interfaces distributed circumferentially in the horizontal direction. The connecting interfaces of two adjacent pagoda six-way joints are connected through a grouting pipeline, and one of the connecting interfaces is connected to the grouting equipment; the pagoda six-way joint is provided with a grouting interface in the vertical direction, and the grouting anchor pipe is connected to the grouting interface.

[0010] In this scheme, the multi-way joint is designed as a pagoda six-way joint. Six more pagoda six-way joints can be connected around the pagoda six-way joint, and the connection is repeated to form a grouting network consisting of pagoda six-way joints and slurry pipelines. Grouting reinforcement can be carried out in a large area of ​​slope area to improve grouting efficiency.

[0011] Furthermore, a joint cap is provided on the connecting interface of the pagoda six-way joint that is not connected to the grouting pipeline.

[0012] Furthermore, the grouting anchor pipe is a snake skin bionic grouting anchor pipe, a plurality of grouting holes are opened on the pipe wall of the snake skin bionic grouting anchor pipe, and a filter net is arranged in each grouting hole.

[0013] In this solution, a filter is provided in the grouting hole to ensure that the slurry can smoothly flow from the inside of the snakeskin bionic grouting anchor pipe into the slope soil while the surrounding soil will not enter the inside of the snakeskin bionic grouting anchor pipe and cause blockage inside the pipe.

[0014] Furthermore, barbs are arranged on the outer wall of the snake skin bionic grouting anchor pipe.

[0015] In this solution, the snakeskin bionic barbs on the side wall of the snakeskin bionic grouting anchor pipe can effectively prevent the pipe body from being pulled out of the soil under the reverse thrust of the grouting pressure during the grouting process, thereby solving the problem of the snakeskin bionic grouting anchor pipe being loosely fixed during construction.

[0016] Furthermore, a three-way joint is arranged on the slurry pipeline; and the grouting nozzle is connected to the third interface of the three-way joint.

[0017] In this solution, the design can flexibly realize the connection of various slurry pipelines on the soil surface, and the number of grouting nozzles on each slurry pipeline can also be flexibly selected according to actual conditions, which is easy to use.

[0018] Furthermore, the grouting equipment includes a grouting pump and a slurry box; the slurry box is connected to the grouting pump through a pipeline, and the grouting pump is connected to one of the multi-way joints through a pipeline.

[0019] In a second aspect, the present invention provides a microbial reinforcement method for anti-erosion soil slope reinforcement based on a microbial reinforcement device for anti-erosion soil slope reinforcement provided in the first aspect, comprising the following steps:

[0020] S1: Level the slope site to be reinforced;

[0021] S2: Drive the grouting anchor pipe into the leveled slope, and connect the multi-way joint and grouting equipment at the top of the grouting anchor pipe;

[0022] S3: preparing a biostimulating liquid and injecting the biostimulating liquid into the slope;

[0023] S4: preparing a cementing solution and injecting the cementing solution into the slope;

[0024] S5: Grouting is completed and the grouting anchor pipe is pulled out;

[0025] S6: The anti-erosion soil slope reinforcement is completed by filling the extraction position of the grouting anchor pipe with in-situ soil.

[0026] In this scheme, the biostimulating liquid is first injected into the slope soil through the grouting anchor pipe. The biostimulating liquid can stimulate the reproduction of the original urease bacteria in the soil, so that the reproduction of urease bacteria in the soil is accelerated and the number of urease bacteria in the soil is increased; then the cementing solution is injected into the soil through the grouting anchor pipe. The reproduced urease bacteria induce the cementing solution to produce precipitation to reinforce the slope, thereby achieving deep reinforcement of the slope soil with good reinforcement effect.

[0027] Furthermore, S3 includes:

[0028] S301: Dissolve yeast extract, ammonium chloride, nickel chloride and urea in water and mix well to obtain a biostimulation solution.

[0029] S302: Loading the biostimulation liquid into the slurry box;

[0030] S303: Start the grouting pump, which transports the biostimulating liquid in the slurry box to each multi-way joint through the slurry pipeline; during the process, part of the biostimulating liquid is sprayed onto the slope surface through the grouting nozzle on the slurry pipeline, and part of the biostimulating liquid is injected into the slope through the grouting anchor pipe at the bottom of the multi-way joint.

[0031] Further, in S5, urea, calcium chloride and water are mixed to obtain a cementing solution.

[0032] In this scheme, the propagated urease bacteria induce the decomposition of urea to produce carbonate ions, which combine with calcium ions to form precipitates, providing sufficient reaction substances for the mineralization of the slope.

[0033] The beneficial effects of the present invention are:

[0034] The microbial reinforcement device for anti-erosion soil slope reinforcement provided by the present invention is designed with a grouting nozzle and a grouting anchor pipe, which are used to grout the surface layer and the interior of the slope respectively, so as to realize the reinforcement of the soil inside the slope and the soil on the surface of the slope, and solve the problem that the traditional spray grouting can only spray on the surface and the treatment depth is limited; it can effectively improve the reinforcement depth and reinforcement effect of the anti-erosion soil slope, and improve the uniformity of microbial reinforcement. After the slope reinforcement work is completed, the equipment can be recycled to prevent waste of resources.

[0035] In the microbial reinforcement method for anti-erosion soil slope reinforcement provided by the present invention, a biostimulating liquid is used to stimulate the reproduction of urease bacteria in the in-situ soil. The reproduced urease bacteria induces urea decomposition and produces precipitation, thereby achieving reinforcement of the slope. Compared with traditional hard slope protection methods, it will not cause pollution to the environment or damage to the ecology. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of a microbial reinforcement device for anti-erosion soil slope reinforcement;

[0037] Figure 2 It is a structural schematic diagram of a pagoda six-way joint;

[0038] Figure 3 It is a structural schematic diagram of the connection between the pagoda six-way connector and the connector cap;

[0039] Figure 4 It is a structural schematic diagram of the connection between the pagoda six-way joint and the grouting anchor pipe;

[0040] Figure 5 It is a structural schematic diagram of the connection between the grouting nozzle and the three-way joint;

[0041] Figure 6 It is a schematic diagram of the structure of the slope leveling in Example 2;

[0042] Figure 7 This is a schematic diagram of the structure of the grouting anchor pipe sunk into the slope in Example 2;

[0043] Figure 8 It is a structural schematic diagram of the grouting process in Example 2;

[0044] Fig. 9 It is a structural schematic diagram of pulling out the grouting anchor pipe in Example 2;

[0045] Fig.10 It is a structural schematic diagram of filling the position after the grouting anchor pipe is pulled out in Example 2.

[0046] Reference numerals:

[0047] 1. Multi-way joint; 2. Slurry pipeline; 3. Grouting equipment; 31. Grouting pump; 32. Slurry box; 4. Grouting anchor pipe; 41. Filter screen; 42. Barb; 5. Grouting nozzle; 6. Pagoda six-way joint; 61. Connecting interface; 62. Grouting interface; 63. Joint cap; 7. Three-way joint; DETAILED DESCRIPTION

[0048] 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.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a microbial reinforcement device for anti-erosion soil slope reinforcement, which can perform grouting on the surface and inside of the slope to achieve deep reinforcement inside the slope; it specifically includes:

[0051] A multi-way connector 1, a slurry pipeline 2, a grouting nozzle 5 and a grouting device 3;

[0052] There are several multi-way joints 1, which are connected to each other through slurry pipelines 2, and grouting nozzles 5 are provided on the slurry pipelines 2; one of the multi-way joints 1 is connected to the grouting equipment 3; the bottom of the multi-way joint 1 is connected to a grouting anchor pipe 4, and the grouting anchor pipe 4 is buried inside the slope. During grouting, the grouting equipment 3 transports the slurry to each multi-way joint 1 through the slurry pipeline 2, and the slurry enters the grouting anchor pipe 4 from the bottom of the multi-way joint 1, and is injected into the slope from the grouting anchor pipe 4 to achieve deep reinforcement of the slope; during transportation, the slurry passes through the grouting nozzle 5, and is sprayed from the grouting nozzle 5, sprayed onto the surface of the slope, and the surface layer of the slope is reinforced.

[0053] like Figure 2As shown, the multi-way joint 1 is a pagoda six-way joint 6, and the pagoda six-way joint 6 has six communication interfaces 61 distributed circumferentially in the horizontal direction. The communication interfaces 61 of two adjacent pagoda six-way joints 6 are connected through a grouting pipeline, and one of the communication interfaces 61 is connected to the grouting equipment 3; the pagoda six-way joint 6 is provided with a grouting interface 62 in the vertical direction, and the grouting anchor pipe 4 is connected to the grouting interface 62. The multi-way joint 1 is designed as a pagoda six-way joint 6, and six pagoda six-way joints 6 can be connected around the pagoda six-way joint 6, and the connection is repeated to form a grouting network composed of the pagoda six-way joint 6 and the slurry pipeline 2, which can be used for grouting reinforcement of a large area of ​​the slope area and improve the grouting efficiency.

[0054] like Figure 3 As shown, a joint cap 63 is provided on the connecting interface 61 of the pagoda six-way joint 6 that is not connected to the grouting pipeline.

[0055] like Figure 4 As shown, the grouting anchor pipe 4 is a snakeskin bionic grouting anchor pipe 4, and a plurality of grouting holes are opened on the pipe wall of the snakeskin bionic grouting anchor pipe 4, and a filter screen 41 is arranged in each grouting hole; the filter screen 41 is arranged in the grouting hole to ensure that the slurry can smoothly flow from the inside of the snakeskin bionic grouting anchor pipe 4 into the slope soil, while the surrounding soil will not enter the inside of the snakeskin bionic grouting anchor pipe 4, causing blockage inside the pipe body.

[0056] Barbs 42 are arranged on the outer wall of the snake skin bionic grouting anchor pipe 4; the barbs 42 can effectively prevent the pipe body from being pulled out of the soil body under the reverse thrust of the grouting pressure during the grouting process, thereby solving the problem that the snake skin bionic grouting anchor pipe 4 is not firmly fixed during the construction process.

[0057] like Figure 5 As shown, a three-way joint 7 is provided on the slurry pipeline 2; the grouting nozzle 5 is connected to the third interface of the three-way joint 7; this design can flexibly realize the connection of various slurry pipelines 2 on the soil surface, and the number of grouting nozzles 5 on each slurry pipeline 2 can also be flexibly selected according to actual conditions, which is convenient to use.

[0058] The grouting equipment 3 includes a grouting pump 31 and a slurry box 32; the slurry box 32 is connected to the grouting pump 31 through a pipeline, and the grouting pump 31 is connected to one of the multi-way connectors 1 through a pipeline.

[0059] Example 2

[0060] This embodiment provides a microbial reinforcement method for anti-erosion soil slope reinforcement based on a microbial reinforcement device for anti-erosion soil slope reinforcement provided in Example 1. The method uses a biostimulation method to stimulate the reproduction of urease bacteria in the in-situ soil without introducing other bacteria into the slope. The method specifically includes the following steps:

[0061] S1: Level the slope site to be reinforced, such as Figure 6 shown.

[0062] S2: Drive the grouting anchor pipe 4 into the leveled slope, and connect the multi-way joint 1 and the grouting equipment 3 on the top of the grouting anchor pipe 4. Figure 7 shown.

[0063] S3: Prepare the biostimulation liquid and inject it into the slope. Figure 8 As shown; specifically including:

[0064] S301: Dissolve 20 g / L yeast extract, 10 g / L ammonium chloride, 0.01 g / L nickel chloride, and 10 g / L urea in water and mix well to obtain a biostimulation solution.

[0065] S302: Loading the biostimulation liquid into the slurry box 32;

[0066] S303: Start the grouting pump 31, and the grouting pump 31 transports the biostimulating liquid in the slurry box 32 to each multi-way connector 1 through the slurry pipeline 2; on the way, part of the biostimulating liquid is sprayed onto the slope surface through the grouting nozzle 5 on the slurry pipeline 2, and part of the biostimulating liquid is injected into the slope through the grouting anchor pipe 4 at the bottom of the multi-way connector 1; after injection, let it stand for a while.

[0067] S4: Prepare a cementing solution by mixing urea, calcium chloride and water to obtain a cementing solution; and inject the cementing solution into the slope in the same direction as the injection of the biostimulating solution.

[0068] S5: Grouting is completed, and the grouting anchor pipe 4 is pulled out. Fig. 9 shown.

[0069] S6: The extraction position of the grouting anchor pipe 4 is filled with in-situ soil, and the anti-erosion soil slope is reinforced to obtain the reinforced slope, such as Fig.10 shown.

[0070] In this embodiment, the biostimulating liquid is first injected into the slope soil through the grouting anchor pipe 4. The biostimulating liquid can stimulate the reproduction of the original urease bacteria in the soil, so that the reproduction of the urease bacteria in the soil is accelerated and the number of urease bacteria in the soil is increased; the reproduced urease bacteria induce the decomposition of urea to produce carbonate ions, and the carbonate ions combine with calcium ions to form precipitates, thereby reinforcing the slope.

[0071] Example 3

[0072] Based on the microbial reinforcement method for anti-erosion soil slope reinforcement provided in Embodiment 2, this embodiment provides a slope reinforcement method using bioaugmentation; in this method, the urease bacteria solution cultivated outside the soil is used to replace the bio-stimulation solution; after injecting the cultivated urease bacteria during the reinforcement process, the cementing solution can be directly injected without waiting for the bacteria in the in-situ soil to multiply, with high construction speed and high reinforcement efficiency.

[0073] Those of ordinary skill in the art will realize that the embodiments herein are for helping the reader 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 of ordinary skill in the art can make various other specific deformations and combinations that do not depart from the essence of the present invention based on these technical revelations disclosed in the present invention, and these deformations and combinations are still within the protection scope of the invention.

Claims

1. A microbial reinforcement device for anti-erosion soil slope reinforcement, characterized in that: It comprises a plurality of multi-way connectors (1), wherein the plurality of multi-way connectors (1) are connected to each other via a slurry pipeline (2), and a grouting nozzle (5) is provided on the slurry pipeline (2); one of the multi-way connectors (1) is connected to a grouting device (3); A grouting anchor pipe (4) is connected to the bottom of the multi-way joint (1), and the grouting anchor pipe (4) is buried inside the slope.

2. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 1 is characterized in that: The multi-way joint (1) is a pagoda six-way joint (6), and the pagoda six-way joint (6) has six communication interfaces (61) distributed circumferentially in the horizontal direction. The adjacent communication interfaces (61) of two adjacent pagoda six-way joints (6) are connected through a grouting pipeline (2), and one of the communication interfaces (61) is connected to the grouting equipment (3); the pagoda six-way joint (6) is provided with a grouting interface (62) in the vertical direction, and the grouting anchor pipe (4) is connected to the grouting interface (62).

3. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 2 is characterized in that: A joint cap (63) is provided on the connecting interface (61) of the pagoda six-way joint (6) that is not connected to the grouting pipeline (2).

4. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 1 is characterized in that: The grouting anchor pipe (4) is a snake skin bionic grouting anchor pipe, a plurality of grouting holes are provided on the pipe wall of the snake skin bionic grouting anchor pipe, and a filter screen (41) is arranged in each grouting hole.

5. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 4 is characterized in that: Barbs (42) are arranged on the outer wall of the snake skin bionic grouting anchor pipe.

6. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 1 is characterized in that: The slurry pipeline (2) is provided with a three-way joint (7); the grouting nozzle (5) is connected to the third interface of the three-way joint (7).

7. The microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 1 is characterized in that: The grouting equipment (3) comprises a grouting pump (31) and a slurry box (32); the slurry box (32) is connected to the grouting pump (31) via a pipeline, and the grouting pump (31) is connected to one of the multi-way connectors (1) via a pipeline.

8. A method for the microbial reinforcement device for anti-erosion soil slope reinforcement according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Level the slope site to be reinforced; S2: driving the grouting anchor pipe (4) into the leveled slope, and connecting the multi-way joint (1) and the grouting equipment (3) at the top of the grouting anchor pipe (4); S3: preparing a biostimulating liquid and injecting the biostimulating liquid into the slope; S4: preparing a cementing solution and injecting the cementing solution into the slope; S5: Grouting is completed, and the grouting anchor pipe (4) is pulled out; S6: The extraction position of the grouting anchor pipe (4) is filled with in-situ soil, and the anti-erosion soil slope reinforcement is completed.

9. The method of the microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 8, characterized in that: The S3 includes: S301: Dissolve yeast extract, ammonium chloride, nickel chloride and urea in water and mix well to obtain a biostimulation solution. S302: Loading the biostimulation liquid into the slurry box (32); S303: Start the grouting pump (31), and the grouting pump (31) transports the biostimulating liquid in the slurry box (32) to each multi-way joint (1) through the slurry pipeline (2); on the way, part of the biostimulating liquid is sprayed onto the slope surface through the grouting nozzle (5) on the slurry pipeline (2), and part of the biostimulating liquid is injected into the slope through the grouting anchor pipe (4) at the bottom of the multi-way joint (1).

10. The method of the microbial reinforcement device for anti-erosion soil slope reinforcement according to claim 9, characterized in that: In S4, urea, calcium chloride and water are mixed to obtain a cementing solution.

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