A kind of ditch sludge in-situ solidification utilization ecological revetment brick and its preparation method

Abstract

The application provides a kind of ditch silt solidification utilization and preparation method of baking-free ecological slope protection brick, which comprises the following steps: draining or pumping water from the ditch, cleaning and leveling the side slope of the ditch; Sprinkle cement and alginate polysaccharide into the bottom of the ditch, and stir to form silt solidification; Use excavator to dig out the stirred silt solidification; Apply machine oil to the inner wall of the upper opening box, use a shovel to shovel the silt solidification into the box, and fill it up; Put the extruder into the box filled with silt solidification, and extrude; Pull out the extruder, and form a hollow ecological slope protection brick blank made of silt solidification in the box; Use artificial method to lay the well-maintained brick blank on the ditch side slope; Fill the ecological slope protection brick with soil nutrients and sow seeds for ecological restoration. The application can improve the resource utilization level of farmland ditch silt, promote high-standard farmland construction and ecological environment protection, and meet the demand for agricultural ecological ditch interception and pollution blocking function.

Description

Technical Field

[0001] The present invention relates to the field of ecological environment protection and resource utilization, and in particular to a fire-free ecological slope protection brick for in-situ solidification and utilization of ditch silt and a preparation method thereof. Background Art

[0002] To effectively accelerate the pace of high-standard farmland reconstruction and construction, improve agricultural comprehensive production capacity, and promote increased agricultural production, efficiency, and farmers' income, farmland ditch desilting is an important part of high-standard farmland reconstruction and construction. This desilting process, carried out as part of the construction process for ecological ditches, will generate a large amount of silt.

[0003] The traditional method for disposing ditch sludge is to landfill it in a suitable location. However, this can cause secondary pollution to the local environment or, due to the low sludge strength, cause secondary geological hazards. When the sludge volume is large, local sludge treatment plants are built for secondary processing, but the construction and processing costs are prohibitive. Furthermore, eco-ditch slope protection often relies on concrete eco-bricks. However, due to the high cost of cement and aggregate, the unit price of these bricks is high, increasing the construction cost of eco-ditch projects.

[0004] Therefore, a kind of unfired ecological slope protection brick and its preparation method for on-site solidification utilization of ditch silt are designed, the silt in the farmland ditch is reused, and the ecological slope protection brick is produced on-site through unfired processing. The ecological slope protection brick is then used in the ecological ditch slope protection. This is of great significance for reducing project costs, promoting ecological environmental protection, improving resource utilization capabilities, and assisting the transformation and construction of high-standard farmland in the new era. Summary of the Invention

[0005] The purpose of the present invention is to provide a kind of unfired ecological slope protection brick for on-site solidification and utilization of ditch silt and its preparation method, which can improve the level of resource utilization of farmland ditch silt, promote high-standard farmland construction and ecological environment protection, and meet the needs of agricultural ecological ditches to intercept and block pollutants.

[0006] A method for preparing unburned ecological slope protection bricks for in-situ solidification and utilization of ditch silt comprises the following steps:

[0007] Step 1: Drain or pump out the ditch water, clean and level the slopes on both sides of the ditch according to the engineering construction design, and clear the stones in the silt at the bottom of the ditch;

[0008] Step 2: Estimate the volume of silt at the bottom of the ditch according to the construction design, and calculate the amount of cement and seaweed polysaccharide based on the mixing ratio of the materials for preparing the ecological slope protection bricks and the silt volume;

[0009] Step 3: Sprinkle cement and seaweed polysaccharide into the bottom of the ditch, and use an excavator to stir the silt, cement and seaweed polysaccharide to form a silt solid. The stirring time is 2-3 minutes;

[0010] Step 4: dig out the stirred sludge solidification material with an excavator and place it on a solidified sludge placement plate;

[0011] Step 5: Apply engine oil to the inner wall of the upper opening of the tray, and use a shovel to shovel the sludge solidification material into the tray to fill it up;

[0012] Step 6: Place the extruder into the tray filled with the sludge solidified material and extrusion, wherein the extruder comprises an extrusion box with an opening at the bottom and a hollow extrusion block that can move up and down in the extrusion box, and a plurality of first steel pipes and a second steel pipe are respectively provided on the top inner wall of the extrusion box and the bottom inner wall of the tray;

[0013] Step 7: Pull out the extruder, and a hollow ecological slope protection brick blank made of silt solidified material is formed in the tray. The top and bottom surfaces of the ecological slope protection brick blank are formed with corresponding sockets. After the ecological slope protection brick blank is left to stand for 2-3 days, the brick blank is poured out;

[0014] Step 8: Prepare multiple green bricks for ecological slope protection using the methods of steps 5 to 7;

[0015] Step 9: Cover the poured bricks with a fine mesh and regularly water them for 7-14 days; according to the length of the ditch, the ditch sludge can be processed in sections and steps 1 to 9 can be repeated;

[0016] Step 10: manually stack the cured bricks on the ditch slope, and connect the sockets of the upper and lower layers of bricks with connecting pins;

[0017] Step 11: Fill the built ecological slope protection bricks with nutrient soil and sow grass seeds for ecological restoration.

[0018] Furthermore, the components of the ecological slope protection brick preparation material are mixed in the following proportions by weight: 5-15 parts by weight of silt, 1 part by weight of cement, and 0.2-0.5 parts by weight of seaweed polysaccharide.

[0019] Furthermore, the cement is ordinary Portland cement with a grade of 425.

[0020] Furthermore, the support box includes a support box wall and a second steel pipe. The support box wall is surrounded by steel sheets to form a cube with an upper opening. Several second steel pipes are welded to the inner wall of the bottom of the support box. The support box is used to hold ditch silt solidified material that can compress an ecological slope protection brick.

[0021] Furthermore, the extruder also includes an extrusion rod, a sleeve, and a first steel pipe. The extrusion rod is welded in a T-shape by two steel pipes. The bottom of the extrusion rod is welded to the extrusion block, and the bottom of the sleeve is welded to the extrusion box. The vertical rod of the extrusion rod can slide up and down in the sleeve. There is a certain distance between the lower part of the extrusion block and the lower opening of the extrusion box to form the bottom thickness of the extruded ecological slope protection brick. Several first steel pipes are welded to the inner wall of the top of the extrusion box.

[0022] A non-fired ecological slope protection brick prepared by the method described above.

[0023] The advantages of the present invention are: the ecological slope protection bricks are prepared from silt, cement, and seaweed polysaccharides in certain weight portions, locally sourced materials, and mechanized on-site in-situ mixing, which can efficiently utilize the silt at the bottom of the ditch, is environmentally friendly, does not dry out and crack during the brick curing stage, has a certain strength, and meets the strength requirements of the ditch slope protection; the extrusion preparation device is simple to operate, can be mass-produced, and is convenient for manual operation, and the ecological slope protection bricks are efficiently prepared on-site; the ecological slope protection bricks are hollow inside and can be filled with nutrient soil or guest soil for plant growth needs, and the plant growth environment does not have high requirements on the acidity and alkalinity of the ecological slope protection bricks themselves; each ecological slope protection brick has 6 holes at the bottom and top, which can be connected to each other by connecting pins to ensure the overall stability of the ditch ecological slope protection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall schematic diagram of the extrusion preparation device of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the tray in the present invention;

[0026] Figure 3 It is a structural schematic diagram of the extruder in the present invention;

[0027] Figure 4 It is a structural schematic diagram of the extruder of the present invention being split into a sleeve-type drawing device and an extrusion box;

[0028] Figure 5 It is a schematic diagram of the application effect of the ecological slope protection brick of the present invention.

[0029] The reference numerals in the figures are described as follows: 1. Support box (1-1 support box wall; 1-2 steel pipe); 2. Extruder (2-1 extrusion rod; 2-2 sleeve; 2-3 hollow extrusion block; 2-4 extrusion box; 2-5 steel pipe); 3. Connecting pin; 4. Ecological slope protection brick blank; 5. Filling soil. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figure 1 The extrusion preparation device includes a tray 1, an extruder 2 and a connecting pin 3. The connecting pin 3 is made of steel bars with a diameter of 2.5 cm and a length of 10 cm.

[0032] Figure 2 This is a schematic diagram of the structure of the tray 1, which includes a tray wall 1-1 and steel pipes 1-2. The tray wall 1-1 is made of steel sheet and measures 32*32*32cm (length*width*height). Six steel pipes 1-2 are welded to the bottom inner wall of the tray 1-1. Each steel pipe is 5cm long and 3cm in diameter. The tray 1 is used to hold ditch silt solidified material, which can compress one ecological slope protection brick.

[0033] Figure 3 This is a schematic diagram of the structure of the extruder 2, which includes an extrusion rod 2-1, a sleeve 2-2, an extrusion block 2-3, an extrusion box 2-4, and a steel tube 2-5. The extrusion block 2-3 is welded from six steel sheets, hollow inside, with no opening at the bottom. Each steel sheet measures 25*25 (length*width). The extrusion box 2-4 measures 30*30*30 cm (length*width*height), welded from five steel sheets, and has an opening at the bottom. The side length of the support box 1 is slightly larger than that of the extruder 2, and both are cube-shaped.

[0034] like Figure 4 As shown, the extrusion rod 2-1 is made of two steel pipes (5 cm in diameter) welded in a T-shape, and the bottom of the extrusion rod 2-1 is welded to the extrusion block 2-3. The sleeve 2-2 is made of a steel pipe with a diameter of 6 cm, and the bottom of the sleeve 2-2 is welded to the extrusion box 2-4. The vertical rod of the extrusion rod 2-1 can slide up and down in the sleeve 2-2. When the extrusion rod 2-1 is lifted together with the extrusion block 2-3, the distance between the lower steel sheet of the extrusion block 2-3 and the lower opening of the extrusion box 2-4 is 5 cm, which is the bottom thickness of the extruded ecological slope protection brick. 6 steel pipes 2-5 are welded to the inner wall of the top of the extrusion box 2-4, and each steel pipe 2-4 is 5 cm long and 3 cm in diameter.

[0035] Figure 5 This is a schematic diagram of the application effect of ecological slope protection bricks. The upper and lower layers of ecological slope protection bricks 4 are staggered and connected at the holes with connecting pins 3. After stacking, soil 5 is filled inside the ecological slope protection bricks 4 to provide a growing environment for later sowing of plant seeds.

[0036] The embodiment of the present invention provides a method for preparing unburned ecological slope protection bricks for in-situ solidification and utilization of ditch silt, comprising the following steps:

[0037] Step 1: Drain or pump out the ditch water, clean and level the slopes on both sides of the ditch according to the construction design, and remove large stones in the silt at the bottom of the ditch;

[0038] Step 2: Estimate the volume of silt at the bottom of the ditch according to the construction design, and calculate the amount of cement and seaweed polysaccharide based on the mixing ratio of the materials for preparing the ecological slope protection bricks and the silt volume; the weight ratio of the components of the materials for preparing the ecological slope protection bricks is: 5-15 parts by weight of silt, 1 part by weight of cement, and 0.2-0.5 parts by weight of seaweed polysaccharide;

[0039] Step 3: Sprinkle cement and seaweed polysaccharide into the bottom of the ditch, and use an excavator to stir the silt, cement and seaweed polysaccharide to form a silt solid. The stirring time is 2-3 minutes;

[0040] Step 4: dig out the stirred sludge solidification material with an excavator and place it on a solidified sludge placement plate;

[0041] Step 5: Apply engine oil to the inner wall of the tray 1 to facilitate demoulding in the later stage, and use a shovel to shovel the sludge solidified material into the tray 1 and fill it up;

[0042] Step 6: Place the extruder 2 into the tray 1 filled with silt solidified material, and press the extrusion rod 2-1 firmly to completely press the extruder 2 into the tray 1, ensuring that the bottom of the extrusion box 2-4 contacts the bottom of the tray 1. The extrusion rod 2-1 presses the extrusion block 2-3 into the tray through the sleeve 2-2;

[0043] Step 7, pull out the extruder 2, and an ecological slope protection brick blank made of silt solidified material will be formed in the tray 1. According to the size of the hollow extrusion block 2-3 25*25*25cm (length * width * height) and the size of the extrusion box 2-4 30*30*30cm (length * width * height), the thickness of the ecological slope protection brick blank is 5cm on all sides and at the bottom, and the upper opening size of the ecological slope protection brick blank is 25*25 (length * width) and 25cm deep. After the ecological slope protection brick blank has been left to stand for 2-3 days, pour it out. When standing, pay attention to covering the opening of the tray with colored strips of cloth or other materials to avoid damage by people and animals;

[0044] Step 8: Prepare multiple green bricks for ecological slope protection using the methods of steps 5 to 7;

[0045] Step 9: Cover the poured bricks with a fine mesh and regularly water them for 7-14 days; according to the length of the ditch, the ditch sludge can be processed in sections and steps 1 to 9 can be repeated;

[0046] Step 10: The cured bricks are manually stacked on the ditch slope, and the sockets of the upper and lower bricks are connected by connecting pins 3. The upper and lower ecological bricks can be connected and fixed with the connecting pins 3 to ensure the overall stability of the ecological slope protection brick structure and prevent collapse;

[0047] Step 11: Fill the built ecological slope protection bricks with nutrient soil and sow grass seeds for ecological restoration.

[0048] Regarding the specific proportions of the materials for preparing the ecological slope protection bricks, this paper provides three embodiments, as follows:

[0049] Recipe Example 1:

[0050] The sludge solidifying agent of this embodiment was prepared by mixing 0.2 parts by weight of seaweed polysaccharide with 1 part by weight of ordinary Portland cement (grade 425) and stirring them thoroughly. The sludge solidifying agent prepared in this ratio was thoroughly stirred with 5 parts by weight of sludge for 2-3 minutes and formed into a standard 150 mm × 150 cm × 150 cm (length × width × height) piece. After curing for 7 days, the unconfined compressive strength reached 430 kPa, and after curing for 30 days, the unconfined compressive strength reached 1.40 MPa.

[0051] Recipe Example 2:

[0052] The sludge solidifying agent of this embodiment was prepared by mixing 0.4 parts by weight of seaweed polysaccharide with 1 part by weight of ordinary Portland cement (grade 425) and stirring them thoroughly. The sludge solidifying agent prepared in this ratio was thoroughly stirred with 8 parts by weight of sludge for 2-3 minutes. The resulting sludge solidifying agent was then formed into a standard 150 mm × 150 cm × 150 cm (length × width × height) product. After curing for 7 days, the unconfined compressive strength reached 315 kPa, and after curing for 30 days, the unconfined compressive strength reached 1.04 MPa.

[0053] Recipe Example 3:

[0054] The sludge solidifying agent of this embodiment was prepared by mixing 0.5 parts by weight of seaweed polysaccharide with 1 part by weight of ordinary Portland cement (grade 425) and stirring them thoroughly. The sludge solidifying agent prepared in this ratio was thoroughly stirred with 15 parts by weight of sludge for 2-3 minutes and formed into a standard 150 mm × 150 cm × 150 cm (length × width × height) piece. After curing for 7 days, the unconfined compressive strength reached 227 kPa, and after curing for 30 days, the unconfined compressive strength reached 735 kPa.

[0055] The unfired ecological slope protection bricks of this invention are made from local ditch silt. The silt does not need to be squeezed out for drainage; instead, it is mixed with a certain proportion of cement and seaweed polysaccharides. No aggregate or calcination is required. They can be prepared, cured, and used for slope protection on-site. They are simple to manufacture, easy to use, and offer strong overall structural stability. This solves the problem of difficult silt disposal while reducing project costs. After application, the ditch slopes possess a certain strength and a high vegetation coverage (over 90%), while also blending seamlessly with the surrounding environment. This makes them eco-friendly slope protection bricks.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for preparing unburned ecological slope protection bricks for in-situ solidification and utilization of ditch silt, characterized by: The steps include: Step 1: Drain or pump out the ditch water, clean and level the slopes on both sides of the ditch according to the engineering construction design, and clear the stones in the silt at the bottom of the ditch; Step 2: Estimate the volume of silt at the bottom of the ditch according to the construction design, and calculate the amount of cement and seaweed polysaccharide based on the mixing ratio of the materials for preparing the ecological slope protection bricks and the silt volume; Step 3: Sprinkle cement and seaweed polysaccharide into the bottom of the ditch, and use an excavator to stir the silt, cement and seaweed polysaccharide to form a silt solid. The stirring time is 2-3 minutes; Step 4: dig out the stirred sludge solidification material with an excavator and place it on a solidified sludge placement plate; Step 5: Apply engine oil to the inner wall of the upper opening of the tray, and use a shovel to shovel the sludge solidification material into the tray to fill it up; Step 6: Place the extruder into the tray filled with the sludge solidified material and extrusion, wherein the extruder includes an extrusion box with an opening at the bottom and an extrusion block that can move up and down in the extrusion box, and a plurality of first steel pipes and a second steel pipe are respectively provided on the top inner wall of the extrusion box and the bottom inner wall of the tray; Step 7: Pull out the extruder, and a hollow ecological slope protection brick blank made of silt solidified material is formed in the tray. The top and bottom surfaces of the ecological slope protection brick blank are formed with corresponding sockets. After the ecological slope protection brick blank is left to stand for 2-3 days, the brick blank is poured out; Step 8: Prepare multiple green bricks for ecological slope protection using the methods of steps 5 to 7; Step 9: Cover the poured bricks with a fine mesh and regularly water them for 7-14 days; process the ditch sludge in sections according to the length of the ditch, and repeat steps 1 to 9; Step 10: manually stack the cured bricks on the ditch slope, and connect the sockets of the upper and lower layers of bricks with connecting pins; Step 11: Fill the built ecological slope protection bricks with nutrient soil and sow grass seeds for ecological restoration; The components of the ecological slope protection brick preparation materials are mixed in the following proportions by weight: 5-15 parts by weight of silt, 1 part by weight of cement, and 0.2-0.5 parts by weight of seaweed polysaccharide; The support box includes a support box wall and a second steel pipe. The support box wall is surrounded by steel sheets to form a cube with an upper opening. A plurality of second steel pipes are welded to the inner wall of the bottom of the support box. The support box is used to hold ditch silt solidified material that can compress an ecological slope protection brick. The extruder also includes an extrusion rod, a sleeve, and a first steel pipe. The extrusion rod is welded in a T-shape by two steel pipes. The bottom of the extrusion rod is welded to the extrusion block, and the bottom of the sleeve is welded to the extrusion box. The vertical rod of the extrusion rod can slide up and down in the sleeve. There is a certain distance between the lower part of the extrusion block and the lower opening of the extrusion box to form the bottom thickness of the extruded ecological slope protection brick. Several first steel pipes are welded to the inner wall of the top of the extrusion box.

2. The method for preparing the unburned ecological slope protection bricks for in-situ solidification and utilization of ditch sludge according to claim 1, characterized in that: The cement is ordinary Portland cement with a label of 425.

3. An unburned ecological slope protection brick prepared by the method according to any one of claims 1-2.

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