Microbial solidification of fish scale pits based on concrete waste and method of preparation

Abstract

The application provides a kind of fish scale pit based on concrete waste and a preparation method, raw materials include concrete broken material, microbial curing bacteria liquid, cementing liquid and natural coconut shell fiber, wherein the concrete broken material is the "skeleton" structure of the whole mixed curing material, which increases the strength, internal friction of the whole material and provides a good attachment point for the microorganisms, biological mineralization point, a large number of microorganisms will generate calcium carbonate crystal to cement soil particles and short coconut shell fiber material. The short coconut shell fiber is the reinforcement of the whole cured material, which has good toughness and tensile strength, can enhance the mechanical strength and erosion resistance of the cured material, the fish scale pit of the application can have good mechanical strength, erosion resistance, durability and ecological environmental protection, mainly using concrete waste and local soil, using the mineralization reaction principle of microbial strains and natural coconut shell fiber to form a whole, which meets the requirements of energy saving and low carbon.

Description

Technical Field

[0001] This invention belongs to the field of slope soil and water conservation technology, and relates to a microbial solidification fish scale pit based on concrete waste and its preparation method. Background Technology

[0002] Fish-scale pits are an engineering measure for controlling soil erosion on the Loess Plateau. They involve digging pits on fractured slopes or steep inclines to level the land and plant trees. The pits are arranged in a fish-scale pattern, hence the name. The materials used to construct the retaining walls around these pits are mainly of four types: the first is local soil, excavated, backfilled, shaped, and compacted; the second is local rubble and boulders; the third is concrete made of sand and gravel mixed with cement; and the fourth is a pre-embedded framework using organic materials. The first two methods use natural local materials, but earthen and rubble retaining walls suffer from poor overall mechanical properties and are susceptible to erosion and damage under heavy rain runoff. Earthen retaining walls are prone to soil particle dispersion and structural damage, while rubble retaining walls may have some of the rubble washed away by the water flow, resulting in structural damage. While concrete embankments and organic material frame embankments offer strong erosion resistance and integrity, they utilize large amounts of cement and organic materials, consuming significant amounts of energy and resources during construction. This fails to meet the requirements of energy conservation and low carbon emissions, resulting in poor environmental protection and ecological compatibility. Concrete waste is a difficult-to-manage construction waste, with landfill disposal being the most common method. Its non-degradable nature causes considerable environmental damage. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a microbial solidification fish scale pit based on concrete waste and its preparation method, which can combine good mechanical strength, erosion resistance, durability and environmental protection. The construction materials used are mainly recycled concrete waste and local soil. The mineralization reaction principle of microbial strains and natural coconut shell fiber are used to form a whole, which meets the requirements of energy conservation and low carbon.

[0004] This invention is achieved through the following technical solution:

[0005] A method for preparing microbially solidified fish-scale pits based on concrete waste, comprising,

[0006] S1. Select the slope to be treated, determine the location for the fish-scale pit, excavate the pit, and spray water on the pit surface.

[0007] S2, mix concrete fragments, short coconut fiber, microbial liquid, binder and water in proportion to obtain a mixture;

[0008] S3, construct embankments along the pit body using the mixture. During the construction of the embankments, add long coconut shell fibers to the embankments and then cover part of the mixture on the surrounding slope of the pit body.

[0009] S4. After the construction is completed, a reverse filter water-conducting layer, a seepage-reducing water-conducting layer, a nutrient slow-release layer, and a surface covering layer are laid sequentially from bottom to top at the bottom of the pit with the embankment. After the laying is completed, microbial liquid and cementing liquid are sprayed on the surface of the embankment and the surface of the covering mixture in the pit, thereby preparing a microbial solidified fish-scale pit based on concrete waste.

[0010] Preferably, in S3, during the construction of the embankment, 6 to 15 long coconut shell fibers are added to the mixture every 10 cm along the embankment.

[0011] Preferably, the mass ratio of the concrete aggregate: water: short coconut fiber: microbial inoculum: cementitious liquid is 46:40:4.5:0.5:3:6.

[0012] Preferably, the reverse filter water guiding layer is laid with crushed concrete material, and the thickness of the crushed concrete material is 5cm;

[0013] The impermeability-reducing and water-conducting layer is laid by mixing 5% sodium bentonite by mass into the original soil, and its thickness is 10cm.

[0014] The nutrient slow-release layer is laid by mixing native soil, cellulose, soybean rhizobium inoculant, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water-retaining agent. The mass ratio of cellulose, soybean rhizobium inoculant, xanthan gum, short coconut shell fiber, montmorillonite powder and compound microbial fertilizer is 2:10:3:15:3:180:12, and its thickness is 10cm.

[0015] The surface covering layer uses original soil material, and shrubs and trees or seedlings are mixed into the original soil, and long coconut fiber and fallen leaves are laid on the surface of the original soil.

[0016] Preferably, the pit body has a semi-elliptical structure; the long side diameter of the pit body is 90-130cm, the short side diameter is 75-105cm, and the depth is 60-80cm; the top width of the embankment body is 10cm and the height is 20-25cm.

[0017] Preferably, the solidified microbial solution is obtained by activating, cultivating, and propagating Bacillus pasteurellii and cold-resistant short bacilli. The culture medium for the solidified microbial solution is CASO AGAR, and the solution is cultured at 30°C and 200 rpm for 36 hours to obtain a highly active solidified microbial solution. The qualified pH value of the solidified microbial solution is greater than 8.5.

[0018] Preferably, the crushed concrete material is obtained by crushing, screening, and washing with high-pressure water from waste concrete blocks collected from building dismantling.

[0019] The crushed concrete material includes a coarse aggregate group and a fine aggregate group, wherein the mass ratio of the coarse aggregate group in the crushed concrete material is not less than 75%, and the remainder is the fine aggregate group; the particle size of the coarse aggregate group is >5mm and less than 15mm, and the particle size of the fine aggregate group is <5mm.

[0020] Preferably, the cementing solution is prepared by mixing a 1.5 mol / L calcium chloride solution and a 1.5 mol / L urea solution in a volume ratio of 1:1.

[0021] Preferably, the length of the long coconut shell fiber is 8~30cm, and the length of the short coconut shell fiber is 1.5~2.5cm.

[0022] A microbial solidified fish-scale pit based on concrete waste, and a method for preparing the microbial solidified fish-scale pit based on concrete waste.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] This invention provides a microbial solidification fish-scale pit based on concrete waste and its preparation method. The raw materials include crushed concrete, microbial solidification liquid, cementing liquid, and natural coconut shell fiber. The crushed concrete forms the "skeleton" structure of the solidified material, increasing overall material strength and internal friction, and providing good adhesion and biomineralization sites for microorganisms. A large number of microorganisms will use these as attachment points to generate calcium carbonate crystal cemented soil particles and short coconut shell fiber material. The short coconut shell fiber acts as a reinforcement in the solidified material, possessing good toughness and tensile strength, enhancing the mechanical strength and erosion resistance of the solidified material. The rough surface of the fiber also provides a good reaction site for microbial adhesion and biomineralization. The crushed concrete and fiber form the "skeleton" support structure and "fascia" connecting structure of the solidified material, resulting in a new material and method for slope soil and water conservation that combines durability, erosion resistance, and environmental friendliness. Compared to existing earthen, stone, and organic material embankments, the fish-scale pit embankment formed by this invention possesses superior mechanical strength, erosion resistance, durability, and environmental friendliness. The construction materials used are primarily recycled concrete waste and local soil, utilizing the mineralization reaction principle of microbial strains and natural coconut shell fibers to form a cohesive whole, meeting energy-saving and low-carbon requirements. The pit slope cover layer formed by this invention increases the overall structure's resistance to runoff and water erosion, making the overall structure more stable and reliable. Simultaneously, the mixed cover layer guides water into the pit, enhancing the overall effect.

[0025] Furthermore, the layered structure at the bottom of the pit enhances its water storage capacity and nutrient supply for vegetation growth, maximizing the pit's ability to restore vegetation, reduce slope runoff, and minimize soil erosion. Attached Figure Description

[0026] Figure 1 This is a cross-sectional structural diagram of the microbial solidification fish scale pit based on concrete waste according to the present invention;

[0027] Figure 2 This is a top view of the microbial solidification fish-scale pit based on concrete waste of the present invention, arranged on a slope.

[0028] Figure 3 This is a flowchart illustrating the preparation process of the microbial solidification fish-scale pit based on concrete waste according to the present invention.

[0029] In the diagram: 1. Embankment; 2. Reinforcement layer; 3. Layered paving structure of the pit; 31. Water-conducting filter layer; 32. Water-retaining and seepage-reducing layer; 33. Nutrient slow-release layer; 34. Surface covering layer. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] This invention provides a microbial solidification fish-scale pit based on concrete waste and its preparation method, a new material and method for slope soil and water conservation that combines durability, erosion resistance and environmental friendliness;

[0033] This patent provides a method for preparing microbial-solidified fish-scale pits based on concrete waste. The main steps include material preparation, on-site pit excavation, material mixing and backfilling with embankments, layering at the pit bottom, and spraying of bacterial solution and binder. Figure 3 As shown.

[0034] (1) First, prepare the raw materials of concrete crushed materials, microbial solidification bacterial liquid, cementitious liquid, and natural coconut shell fibers. The concrete crushed materials are obtained by crushing, screening, and high-pressure water washing of waste concrete blocks collected from building demolition. The particle size requirement is less than 15 mm, which is divided into a coarse aggregate group (>5 mm) and a fine aggregate group (<5 mm). The mass ratio of the coarse aggregate group is not less than 75%, and the high-pressure water washing time is not less than 10 minutes. The washing is to remove the alkaline substances on the surface of the crushed materials and the retained cement powder ash. The microbial solidification bacterial liquid is obtained by active treatment, cultivation, and propagation of Bacillus pasteurii (for the normal temperature area) and Brevibacterium frigoritolerans (for the high-cold area) strains. The culture medium is CASO AGAR, and it is cultured in a constant temperature shaker at 30 °C and 200 rpm for 36 h to obtain a highly active bacterial liquid. The qualified pH measurement value of the 36-h bacterial liquid needs to be greater than 8.5. The cementitious liquid is composed of 1.5 mol / L calcium chloride solution and 1.5 mol / L urea solution mixed in a ratio of 1:1. After the two are prepared, they are not mixed first and are mixed and shaken well during use. The natural coconut shell fibers are obtained after coconut shell processing, mechanical beating, and selection. They are respectively cut into long coconut shell fibers and short coconut shell fibers after shearing. The length of the long coconut shell fibers is controlled at 8 - 30 cm, and the length of the short coconut shell fibers is controlled at 1.5 - 2.5 cm. Among them, the concrete crushed materials are the "skeleton" structure of the overall mixed and solidified material, increasing the strength and internal friction of the overall material and providing good attachment and biomineralization sites for microorganisms. A large number of microorganisms will use this as an attachment point to generate calcium carbonate crystals to cement soil particles and short coconut shell fiber materials. The short coconut shell fibers are the reinforcement of the overall solidified material. It has good toughness and tensile strength, can enhance the mechanical strength and erosion resistance of the solidified material, and the rough surface of the fiber also provides good reaction sites for microbial attachment and biomineralization. The concrete crushed materials and fibers form the "bone" support structure and "fascia" connection structure of the overall solidified material.

[0035] (2) On-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, and excavate a pit with a semi-elliptical structure at the selected position. The long diameter of the pit is controlled at 90 - 130 cm, the short diameter is controlled at 75 - 105 cm, and the excavation depth is 60 - 80 cm. Level the pit surface of the excavated pit and spray a small amount of water.

[0036] (3) Material mixing and backfilling for embankment construction: Remove part of the excavated original soil and mix it evenly and thoroughly according to the mass ratio of original soil: concrete fragments: water: short coconut shell fiber: microbial inoculum: cementitious liquid of 46:40:4.5:0.5:3:6 to obtain a mixture. The mixing time should not be less than 5 minutes. A small amount of water and microbial inoculum can be added during the mixing process. Insert two "U"-shaped plastic baffles obliquely into the outside of the excavated pit and the edge of the pit respectively, with an insertion depth of about 1 / 4 of the height of the baffles. Remove the soil between the baffles and fill the gaps between the baffles with the evenly mixed material, layer by layer. Fill and compact the mixture. After filling, let it stand for 30 minutes and then slowly remove the two plastic boards. Smooth the surface of the mixture to form the constructed embankment structure. The embankment is 10cm wide at the top and 20-25cm high. During the construction process, add long coconut shell fibers to ensure that 6-15 long coconut shell fibers are mixed in every 10cm. About 1 / 4 of the embankment is buried underground. The surface of the embankment can be lightly compacted and leveled to ensure low roughness. Then, use the remaining mixture to cover the surrounding slope of the excavated pit to form a reinforcement layer with a thickness of not less than 2cm. The bottom of the pit is not covered.

[0037] (4) Layered laying of pit bottom: After leveling the pit bottom, first lay a 5cm thick layer of crushed concrete as a reverse filter water-conducting layer, which can effectively drain water when there is too much water in the pit; then lay a 10cm thick seepage-reducing water-conducting layer, which is obtained by uniformly mixing 5% sodium bentonite into the original soil material. The main purpose is to reduce the permeability coefficient and increase the water retention capacity of the entire pit; then lay a 10cm thick nutrient slow-release layer. The main purpose of this soil layer is to provide slow-release nutrients for the subsequently planted vegetation. It mainly consists of original soil, cellulose, and soybean root nodules. The product consists of microbial agents, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer, and water-retaining agent. The mass ratio of the original soil, cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer, and water-retaining agent is 7000:2:10:3:15:3:180:12. After the nutrient slow-release layer is laid, a surface covering layer is laid. The surface covering layer is made of loose original soil, and a certain amount of shrubs or trees or seedlings can be placed in the original soil layer. A suitable amount of long coconut shell fiber and surrounding fallen leaves are scattered on the surface of the original soil.

[0038] (5) Spraying of bacterial solution and cementing solution: Use a handheld atomizing sprayer with a medium-low spraying pressure to spray the solution, ideally atomizing the liquid. First, spray the surface of the embankment and the surface of the reinforced layer inside the pit with the sprayer filled with microbial solution. Spray multiple times, trying to avoid obvious runoff, so that the bacterial solution can fully penetrate the embankment and the reinforced layer. 2-3 hours after the bacterial solution spraying is completed, spray the cementing solution evenly onto the embankment and the surface of the covered mixture, in small amounts and multiple times, so that it can fully penetrate. Spray 3-7 times according to the above method, with an interval of 24-36 hours between each spraying. Each spray should contain no less than 300ml of bacterial solution, and the spraying distance should be controlled at 15-20cm. After each spraying, observe the embankment for any obvious gaps or areas that have not been sprayed, and re-spray to ensure that the entire embankment is fully sprayed and cured to form a complete and uniform whole.

[0039] like Figure 1 and Figure 2 As shown, the embankment 1 is an elliptical arc structure. It is formed by shaping and compacting a mixture of soil, concrete fragments, water, short coconut shell fibers, microbial inoculum, and cementitious liquid, along with extended coconut shell fibers. This mixture is reinforced through multiple applications of inoculum and cementitious liquid. It possesses excellent mechanical properties, erosion resistance, and integrity, with low overall permeability. This effectively blocks rainwater runoff, allowing it to infiltrate and store water in the pit. Excess runoff is diverted by the embankment, continuing to flow down the slope at a lower velocity and flow rate. The long coconut shell fibers act as interlocking friction elements within the material structure, increasing internal friction and improving the overall integrity and crack resistance of the embankment. The reinforcement layer 2 is a thin layer of the mixture covering the slope surface, reinforced through multiple applications, protecting the slope of the pit and guiding water into it. The layered paving structure 3 of the pit specifically includes a reverse filter water-conducting layer 31, which prevents the loss of particles from the upper layer structure and allows water to be diverted from the cover layer to the surrounding soil when there is too much water in the pit; a seepage-reducing and water-retaining layer 32, which reduces the permeability coefficient relative to the original soil, enabling the water pit to have sufficient water storage capacity; a nutrient slow-release layer 33, in which various materials can improve soil structure, regulate soil pH, and slowly release nutrients, providing good conditions for the germination of tree and shrub seeds and the growth of seedlings; and a surface covering layer 34, which is loose backfilled original soil, long coconut husk fiber, and fallen leaves. The main structure of this layer is to retain the original soil microbial community and seed bank, providing relatively original local conditions for subsequent vegetation planting.

[0040] Example:

[0041] Experimental testing and analysis: Loess was collected from a certain place in northern Shaanxi and other materials were produced and purchased to prepare two sets of samples: (1) Dry density of 1.6 g / cm³ 3, specimens with a moisture content of 12%; (2) specimens with a mass ratio of original soil, concrete aggregates, water, short coconut shell fibers, microbial bacterial solution, and cementing solution of 46:40:4.5:0.5:3:6, which are uniformly mixed and have a density of 1.86 g / cm 3 specimens, and specimens that are sprayed with the microbial bacterial solution and the cementing solution three times. Their unconfined compressive strength, permeability coefficient, and soil loss rate after 10 minutes of rainfall with a rainfall intensity of 60 mm / h are respectively tested. The results are as follows. It can be seen that the soil strength has increased significantly, and the permeability coefficient and scoured soil loss rate have decreased significantly.

[0042] Table 1: Test data

[0043]

[0044] The fish-scale pit embankment formed by the present invention can have good mechanical strength, erosion resistance, durability, and ecological environmental protection compared with the existing soil embankments, stone embankments, and organic material embankments. The construction materials used are mainly recycled concrete waste and local soil. Using the mineralization reaction principle of microbial strains and natural coconut shell fibers, it forms a whole, meeting the requirements of energy conservation and low carbon. The formed pit slope covering layer increases the anti-runoff and water erosion resistance of the overall structure, making the overall structure more stable and reliable. At the same time, the mixed material covering layer guides water into the pit body, enhancing the overall effect. The stratified structure set at the bottom of the pit can improve the water storage capacity of the pit body and the ability to supply nutrients for vegetation growth, and can maximize the ability of the fish-scale pit to restore vegetation, reduce slope runoff, and soil erosion.

[0045] One of the preferred implementation methods: On-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, excavate a pit with a semi-elliptical structure at the selected position, control the long diameter of the pit at 90 cm, the short diameter at 75 cm, and the excavation depth at 60 cm. Level the surface of the excavated pit and spray a small amount of water.

[0046] Form a constructed embankment structure on the surface of the leveling mixture. The top width of the embankment is 10 cm and the height is 20 cm. Add long coconut shell fibers during the construction process, ensuring that 6 long coconut shell fibers are mixed every 10 cm in length.

[0047] Spraying of the bacterial solution and the cementing solution: Use a sprayer of the microbial bacterial solution to spray the surface of the embankment and the surface of the reinforcement layer in the pit. It can be sprayed multiple times, and try not to generate obvious runoff as much as possible, so that the bacterial solution fully penetrates into the embankment and the reinforcement layer. After 2 hours of the end of the bacterial solution spraying, evenly spray the cementing solution on the embankment and the surface of the covering mixture that has been sprayed with the bacterial solution in small amounts and multiple times, so that it all penetrates. Spray according to the above method three times, with a time interval of 24 h for each spraying. The amount of the bacterial solution sprayed each time is 300 ml, and the spraying position distance is controlled at 15 cm. The remaining preparation methods are the same.

[0048] One of the preferred embodiments, on-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, excavate a pit with a semi-elliptical structure at the selected position, control the long diameter of the pit at 130 cm, the short diameter at 105 cm, and the excavation depth at 80 cm. Level the surface of the excavated pit and sprinkle a small amount of water. Level the surface of the mixture to form a constructed ridge structure with a top width of 10 cm and a height of 25 cm. Add long coconut shell fibers during the construction process, ensuring that 15 long coconut shell fibers are mixed in every 10 cm length.

[0049] Spraying of bacterial liquid and cementing liquid: Use a sprayer of microbial bacterial liquid to spray the surface of the ridge and the surface of the reinforcement layer in the pit. Multiple sprays can be carried out, and try not to generate obvious runoff as much as possible, so that the bacterial liquid fully penetrates into the ridge and the reinforcement layer. After 3 hours of spraying the bacterial liquid, evenly spray the cementing liquid onto the ridge and the surface of the covering mixture that has been sprayed with the bacterial liquid in small amounts and multiple times, so that it all penetrates. Spray according to the above method 7 times, with a time interval of 36 h for each spray, 600 ml of bacterial liquid sprayed each time, and the spraying position distance controlled at 20 cm. The remaining preparation methods are the same.

[0050] One of the preferred embodiments, on-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, excavate a pit with a semi-elliptical structure at the selected position, control the long diameter of the pit at 110 cm, the short diameter at 85 cm, and the excavation depth at 70 cm. Level the surface of the excavated pit and sprinkle a small amount of water. Level the surface of the mixture to form a constructed ridge structure with a top width of 10 cm and a height of 22 cm. Add long coconut shell fibers during the construction process, ensuring that 10 long coconut shell fibers are mixed in every 10 cm length;

[0051] Spraying of bacterial liquid and cementing liquid: Use a sprayer of microbial bacterial liquid to spray the surface of the ridge and the surface of the reinforcement layer in the pit. Multiple sprays can be carried out, and try not to generate obvious runoff as much as possible, so that the bacterial liquid fully penetrates into the ridge and the reinforcement layer. After 2.5 hours of spraying the bacterial liquid, evenly spray the cementing liquid onto the ridge and the surface of the covering mixture that has been sprayed with the bacterial liquid in small amounts and multiple times, so that it all penetrates. Spray according to the above method 5 times, with a time interval of 28 h for each spray, 400 ml of bacterial liquid sprayed each time, and the spraying position distance controlled at 18 cm. The remaining preparation methods are the same.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of this invention herein are only for the purpose of describing specific embodiments and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A method of preparing a microbial-cured fish scale pit based on concrete waste material, characterized by, Comprising, S1, selecting a slope to be treated, selecting the construction position of the fish scale pit, excavating the pit, and spraying water on the pit surface, S2, mixing the concrete broken material, short coconut shell fiber, microbial solidification bacteria liquid, cementing liquid and water in proportion to obtain a mixed material; S3, building a ridge body along the pit body during the process of building the ridge body, adding long coconut shell fiber in the ridge body, and then covering part of the mixed material on the peripheral slope surface of the pit body; S4, after the completion of the construction, laying the anti-filtration water guide layer, the seepage reduction water guide layer, the nutrient slow-release layer and the surface cover layer in the pit body from bottom to top, and then spraying the microbial solidification bacteria liquid and the cementing liquid on the surface of the ridge body and the surface of the mixed material in the pit body, thereby preparing the microbial solidification fish scale pit based on the concrete waste material; In S3, 6-15 long coconut shell fibers are added in the mixed material every 10 cm along the ridge body during the process of building the ridge body; The mass ratio of the concrete broken material:water:short coconut shell fiber: microbial solidification bacteria liquid:cementing liquid is 46:40:4.5:0.5:3:6; The length of the long coconut shell fiber is 8-30 cm, and the length of the short coconut shell fiber is 1.5-2.5 cm; The anti-filtration water guide layer is laid by the concrete broken material, and the thickness of the concrete broken material is 5 cm; The seepage reduction water guide layer is laid by mixing 5% mass fraction of Na-based bentonite in the original soil, and the thickness is 10 cm; The nutrient slow-release layer is laid by mixing the original soil, cellulose, soybean nodule bacteria agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water retaining agent, wherein the mass ratio of the cellulose, soybean nodule bacteria agent, xanthan gum, short coconut shell fiber, montmorillonite powder and compound microbial fertilizer is 2:10:3:15:3:180:12, and the thickness is 10 cm; The surface cover layer is laid by the original soil, and long coconut shell fiber and fallen leaves are laid on the surface of the original soil.

2. A method of preparing a microbial-cured fish scale pit based on concrete waste material according to claim 1, characterized in that, The pit body is a semi-elliptical structure, the long side diameter of the pit body is 90-130 cm, the short side diameter is 75-105 cm, and the depth is 60-80 cm; the top width of the ridge body is 10 cm, and the height is 20-25 cm.

3. A method of preparing a microbial-cured fish scale pit based on concrete waste according to claim 1, characterized in that, The microbial solidification bacteria liquid is obtained by active treatment, cultivation and propagation of Bacillus pasteurii and cold-resistant Brevibacterium, the culture medium of the microbial solidification bacteria liquid is CASO AGAR, and the high-activity microbial solidification bacteria liquid is obtained after 36 h of cultivation at 30℃ in a constant temperature shaker at 200 rpm, and the qualified pH measurement value of the microbial solidification bacteria liquid is greater than 8.

5.

4. A method of preparing a microbial-cured fish scale pit based on concrete waste according to claim 1, characterized in that, The concrete broken material is obtained by crushing, screening and high-pressure water washing of the waste concrete blocks collected by building demolition; The concrete broken material includes a coarse aggregate group and a fine aggregate group, wherein the mass ratio of the coarse aggregate group in the concrete broken material is not less than 75%, and the rest is the fine aggregate group; the particle size of the coarse aggregate group is >5 mm and <15 mm, and the particle size of the fine aggregate group is <5 mm.

5. A method of preparing a microbial solidified fishscale pit based on concrete waste material according to claim 1, characterized in that, The cementing fluid is mixed by 1.5 mol / L calcium chloride solution and 1.5 mol / L urea solution with the volume ratio of 1:

1.

6. A microbial-cemented fish-scale pit based on concrete waste material, characterized by, The fish-scale pit is prepared by the method according to any one of claims 1-5 based on concrete waste.

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