System for manufacturing self-compacting backfill

Abstract

The application discloses a manufacturing system of self-compacting backfill material, which comprises: a plurality of hoppers, each of which contains any one of brick powder, slag, glass slag and slag; a plurality of silos, each of which contains cement or slag powder (note: different from the slag particle size) or fly ash; a storage tank containing an additive; a water tank containing water; and a self-compacting backfill material production device, wherein the materials in the hoppers are transported to the self-compacting backfill material production device through a conveying belt provided with a first metering device, the materials in the silos are transported to the self-compacting backfill material production device through a second metering device and a first discharge valve, and the additive in the storage tank is transported to the water tank through a third metering device and a second discharge valve, mixed with water in the water tank and then transported to the self-compacting backfill material production device. Through the technical scheme, the construction waste can be recycled, and the manufacturing cost of the self-compacting backfill material is reduced.

Description

Technical Field

[0001] This invention relates to the field of manufacturing materials for self-compacting backfill, and more specifically to a manufacturing system for self-compacting backfill. Background Technology

[0002] The selection of backfill material for pipeline trenches is a crucial factor affecting the quality of pipeline construction. Standard backfill materials can provide robust protection for the constructed pipelines based on their fluidity, curing properties, and frost resistance. In my country, urban drainage pipelines are mostly made of flexible materials. To meet national standards, coarse sand is generally the only suitable backfill material for the pipe armholes.

[0003] However, coarse sand is sourced from natural river sand resources. As natural river sand resources decrease, the price of high-quality medium-coarse sand materials, which are easier to control, gradually increases. Furthermore, the large-scale use of natural river sand resources will reduce the water conservation capacity of river channels and affect the balance of river ecosystems.

[0004] Meanwhile, the problem of construction waste disposal in my country is becoming increasingly prominent. In 2020, Shanghai alone reported a total of 107.82 million tons of construction waste to be disposed of. The disposal of this construction waste will generate a large amount of carbon dioxide emissions, and 70% of the construction waste is construction solid waste. According to the calculation that one acre of landfill land is occupied for every 10,000 tons of construction solid waste, the construction waste generated in Shanghai each year requires several thousand acres of land for landfill, further exacerbating the existing shortage of land resources.

[0005] Therefore, there is an urgent need for a system that can recycle and reuse difficult-to-process construction waste, and replace natural resources such as river sand, thereby reducing costs and achieving environmental protection and emission reduction. Summary of the Invention

[0006] To address the issues of high cost of existing pipeline trench backfill materials and the difficulty in recycling and reusing construction waste, this invention provides a manufacturing system for self-compacting backfill material. The system includes: multiple silos containing any one of the following materials: brick powder, slag, glass slag, or mineral slag; multiple silos containing cement, or mineral slag powder (note: with a different particle size than mineral slag), or fly ash; a storage tank containing admixtures; a water tank containing water; and a self-compacting backfill material production device. Materials from the silos are conveyed to the self-compacting backfill material production device via a conveyor belt equipped with a first metering device. Materials from the silos are conveyed to the self-compacting backfill material production device via a second metering device and a first discharge valve. Admixtures from the storage tank are conveyed to the water tank via a third metering device and a second discharge valve, where they are mixed with water before being conveyed to the self-compacting backfill material production device.

[0007] According to the above technical solution, one or more of the following materials in the silo—brick powder, slag, glass slag, and mineral slag—can be collectively referred to as aggregates for producing self-compacting backfill. The aggregate feed rate is measured by a first metering device and conveyed to the self-compacting backfill production device via a conveyor belt, with the conveying speed controlled by the conveyor belt. Cement and / or slag powder and / or fly ash are conveyed to the self-compacting backfill production device, and the feed rate is measured by a second metering device and controlled by a first discharge valve. The storage tank is connected to a water tank, and admixtures are preferentially conveyed to the water tank for mixing. The amount of admixtures fed into the water tank is measured by a third metering device, and the start and stop of the conveying is controlled by a second discharge valve. The mixed admixture aqueous solution is then conveyed to the self-compacting backfill production device. Through the above methods, the recycling of construction waste in aggregates is realized. By controlling the speed of the conveyor belt and the opening and closing of the first and second discharge valves, the feeding amount of cement and / or slag powder and / or fly ash and admixture aqueous solution is precisely controlled. This achieves unified coordination of the proportion of self-compacting backfill and ensures the accuracy of the proportion of each raw material in the manufacture of self-compacting backfill.

[0008] Preferably, the second metering device is installed in the silo pipeline that connects the silo to the self-compacting backfill production device.

[0009] According to the technical solution provided by the present invention, the second metering device is used to measure the amount of cement and / or slag powder and / or fly ash fed from the silo to the self-compacting backfill production device. The cement and / or slag powder and / or fly ash in the silo are all conveyed by the silo pipeline. The second metering device is set on the silo pipeline to facilitate the calculation of the conveying rate in the silo pipeline and improve the metering accuracy.

[0010] Preferably, it also includes a clear water tank, which is connected to a water tank. The clear water from the clear water tank is transported to the water tank via a fourth metering device. A third discharge valve is installed on the pipeline connecting the water tank and the self-compacting backfill production device.

[0011] According to the technical solution provided by this invention, the amount of clean water fed into the water tank can be measured by a fourth metering device, thereby improving the accuracy of the additive aqueous solution concentration. The feeding of the additive aqueous solution to the self-compacting backfill production device can be controlled or stopped by opening and closing the third discharge valve.

[0012] Preferably, the manufacturing system further includes an unloading room connected to the silo. The silo includes a raw material storage room and a loading room. Dust collection points are set in the unloading room, the raw material storage room, and the loading room so that the pressure in the unloading room, the raw material storage room, and the loading room can be set to negative pressure. The dust collection points can be induced draft fans. The unloading room is set as a double-layer sealed room, and an underground passage is set between the unloading room and the raw material storage room. An unloading conveyor belt connecting the unloading room and the raw material storage room is set in the underground passage, and the unloading conveyor belt is equipped with an unloading metering device.

[0013] According to the technical solution provided by this invention, the unloading room is used to receive aggregates stored in the silo. The aggregates are unloaded into the unloading room and then conveyed to the raw material storage room. Vehicles transporting aggregates enter the unloading room and unload after double-sealing. The aggregates are unloaded onto the unloading conveyor belt in the underground passage, weighed by the unloading metering device, and then conveyed to the raw material storage room by the unloading conveyor belt. When the aggregates are conveyed to the self-compacting backfill production device, they are conveyed from the raw material storage room to the loading room and then to the self-compacting backfill production device. During the unloading process in the unloading room, the unloading process in the raw material storage room, and the loading process in the loading room, dust is easily generated due to the small particle size of the aggregates. By setting up dust collection points (e.g., induced draft fans), negative pressure can be achieved in the unloading room, the raw material storage room, and the loading room, and negative pressure airflow can be generated. The dust is concentrated to the outlet of the negative pressure airflow, thereby reducing dust pollution in the unloading room, the raw material storage room, and the loading room.

[0014] Preferably, the manufacturing system further includes a mud pit containing engineering mud, to which dust from the unloading room, raw material storage room and loading room, dust from the silo and dust from the self-compacting backfill production unit are transported.

[0015] According to the technical solution provided by this invention, dust is generated during the feeding room, raw material storage room, unloading room, and conveyor belt transport of aggregates, and is collected at the outlet of the negative pressure airflow. A large amount of dust is also generated during the feeding and unloading of materials in the silo, and further a significant amount of dust is generated during the batching process of materials in the self-compacting backfill production device. By collecting the dust from these locations, the collected dust can be transported uniformly or separately to a mud pit, mixed with the engineering mud in the mud pit, and reused, thereby reducing dust pollution and saving raw material costs.

[0016] Preferably, a dust collector is installed in any of the unloading room, raw material storage room, feeding room, silo, and self-compacting backfill production device.

[0017] According to the technical solution provided by the present invention, the dust collector can improve the dust treatment efficiency.

[0018] Preferably, multiple silos are arranged around the self-compacting backfill production device, and a mud pit is located between the self-compacting backfill production device and the feeding room.

[0019] According to the technical solution provided by this invention, multiple silos are arranged radially outwards from the self-compacting backfill production device as the center. Compared to horizontal or vertical arrangements, the building density of each silo and the self-compacting backfill production device is increased, making the footprint of the manufacturing system more concentrated and facilitating unified management and maintenance. A mud pit is located between the self-compacting backfill production device and the feeding room, shortening the distance required for dust recovery from the self-compacting backfill production device and the feeding room to the mud pit, thus reducing dust recovery costs.

[0020] Preferably, the manufacturing system further includes a control device that is communicatively connected to the first metering device, the second metering device, the third metering device, and the fourth metering device, and controls the operation of the conveyor belt, the first discharge valve, the second discharge valve, and the third discharge valve based on the information from the first metering device, the second metering device, the third metering device, and the fourth metering device.

[0021] According to the technical solution provided by the present invention, the control device receives the feed amounts from the first, second, third, and fourth metering devices, and issues control commands through comparison and analysis to control the conveyor belt speed and the opening and closing of the first, second, and third discharge valves, ensuring the accuracy of the raw material ratios during the manufacture of self-compacting backfill. The self-compacting backfill manufacturing system provided by the present invention can manufacture self-compacting backfill material using recyclable raw materials without generating "three wastes" (i.e., exhaust gas emissions meeting Class III atmospheric standards, wastewater recycling, and noise insulation in the factory building). Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a self-compacting backfill manufacturing system module provided by the present invention.

[0023] Figure 2 A schematic diagram of the process flow for a self-compacting backfill manufacturing system provided by the present invention.

[0024] Figure 3 This invention provides a schematic diagram of a dust collection and treatment process for a self-compacting backfill manufacturing system.

[0025] Figure 4 This is a schematic diagram of a factory layout for a self-compacting backfill manufacturing system provided by the present invention.

[0026] Figure 5 This is a schematic diagram showing the positional relationship between the unloading room, conveyor belt, and self-compacting backfill production device of a self-compacting backfill manufacturing system provided by the present invention.

[0027] Figure label:

[0028] 10. Material silo; 11. Raw material storage room; 12. Feeding room; 13. First metering device; 14. Conveyor belt; 20. Silo; 21. Second metering device; 22. First discharge valve; 23. Silo pipeline; 30. Storage tank; 31. Third metering device; 32. Second discharge valve; 40. Water tank; 41. Third discharge valve; 50. Self-compacting backfill production device; 51. Control device; 60. Unloading room; 70. Mud pool; 71. Mud pump; 72. Engineering mud; 80. Clear water pool; 81. Fourth metering device; 90. End-of-line dust removal device; G1. Storage and unloading dust; G2. Unloading dust; G3. Feeding dust; G4. Mixed dust; G5. Silo dust. Detailed Implementation

[0029] First Embodiment

[0030] This embodiment discloses the ingredient composition of a self-compacting backfill material. The self-compacting backfill material is a material used for backfilling trenches where urban water supply and drainage pipelines are laid. The self-compacting backfill material can also be defined as: a material made of aggregates, cementitious materials, admixtures and water, etc., which are uniformly mixed in a certain proportion to form a material with certain fluidity, uniformity and stability. It does not require external force to compact or vibrate during backfilling construction, can flow and fill the trench space under its own weight, and has a certain compressive strength after curing.

[0031] The self-compacting backfill material provided in this embodiment uses aggregates formed from slag and brick powder, which act as a skeleton or filler in the overall material.

[0032] Construction waste, specifically excavated soil, constitutes 20%-40% of the self-compacting backfill material by weight. This excavated soil, a type of construction waste, is a coarse-grained mixture of soil and rock, including brick fragments, concrete debris, and stones. Its main chemical components are silicates and calcium carbonate. Excavated soil from construction sites requires screening. Wood, plastics, fabrics, alloys, and organic materials must be removed. Organic materials are particularly important, as excessive organic content will affect the curing effect of the gel material; therefore, the organic content in the excavated soil should not exceed 4%. Furthermore, to ensure the uniformity of the self-compacting backfill material, the maximum particle size in the excavated soil should not exceed 60mm.

[0033] Slag and soil account for 30%-60% of the weight of self-compacting backfill material, and brick powder is also a type of construction waste, mainly originating from the demolition of old buildings. Since most old buildings are brick-concrete structures, waste clay bricks constitute a significant proportion of the construction waste. Currently, the main methods for disposing of waste clay bricks are simple landfilling or open-air dumping, which pollutes the environment and occupies land. However, brick powder is actually made from high-quality clay and possesses a certain degree of volcanic ash activity, offering potential for reuse.

[0034] Another point worth mentioning is that, since the main component of brick powder is SiO2, it is beneficial to the cement hydration reaction. The fine particles of brick powder make it easier for the same amount of cement to form calcium silicate hydrate (CSH gel), ensuring the cement's performance as a cementitious material. This reduces the amount of cement used and helps lower costs.

[0035] In other embodiments of the present invention, other construction wastes, including brick powder and slag, such as glass slag, and other industrial processing wastes, such as steel slag and mineral slag, can also be added as aggregates to the proportion of self-compacting backfill.

[0036] Gel materials are typically composed of mineral admixtures other than aggregates, water, and additives. In this embodiment, the gel materials used are cement, slag powder, and fly ash.

[0037] PO42.5 silicate cement can be selected as the cement. Its particle size distribution curve was determined by laser diffraction particle size analyzer. Adding fly ash to the cement helps improve the stability of the gel material's performance and reduces the heat of hydration. Furthermore, the leaching rate of cement with added fly ash in fresh water is within the standard range, ensuring the pipeline backfill material's resistance to groundwater corrosion when used as a pipeline backfill material.

[0038] Slag powder has potential hydration activity, and when mixed with cement, it is activated by the calcium hydroxide produced during cement hydration to form hydrated calcium silicate. Hydrated calcium silicate can autonomously fill the gaps between cement particles, ensuring the density and hardness of the cement after curing.

[0039] Admixtures are a collective term for water-reducing agents, air-entraining agents, early-strength agents, retarders, pumping agents, antifreeze agents, quick-setting agents, expanding agents, waterproofing agents, and rust inhibitors added to improve the performance of self-compacting backfill materials. Their main function is to give the self-compacting backfill material ideal flowability, curing speed, and antifreeze properties. Taking flowability as an example, before the addition of admixtures, the surface of the material particles carries opposite charges, causing association between particles. Therefore, nearly one-third of the water is trapped within the particles and cannot flow freely, thus affecting the flowability of the self-compacting backfill material. After the addition of admixtures, the surface of the material particles will all carry negative charges, forming an electrostatic repulsion effect, promoting particle dispersion, releasing the water originally trapped within the particles, and allowing it to participate in the flow, thus improving the flowability of the self-compacting backfill material.

[0040] The additive can be an aqueous solution of a polycyclic aromatic sulfate and / or a water-soluble resin sulfonate, preferably an aqueous solution of anthracene sulfate or naphthalene sulfate, and more preferably an anthracene sulfate with a concentration of 30%. In this embodiment, unless otherwise specified, the polycyclic aromatic sulfate used is an anthracene sulfate with a concentration of 30%.

[0041] In addition, the admixture used in this embodiment may also contain component B, which is composed of tricarboxylic acid compounds and / or zinc chloride, or component C, which is composed of calcium formate and / or calcium aluminate. Because the self-compacting backfill material provided in this invention contains a certain proportion of moisture, the strength of the self-compacting backfill material is within the range of 0.20 MPa to 2.00 MPa. However, the higher the moisture content of the self-compacting backfill material, the longer the solidification time, which is not conducive to the requirements of rapid backfilling construction of drainage pipes. Therefore, in order to adjust the solidification time of the self-compacting backfill material, tricarboxylic acid compounds and / or zinc chloride, which can shorten the solidification time, can be appropriately added.

[0042] Second Embodiment

[0043] This embodiment provides a manufacturing system for self-compacting backfill, mainly including a self-compacting backfill production device 50. The self-compacting backfill production device 50 is mainly used to manufacture self-compacting backfill using various materials conveyed from the following components. More specifically, such as... Figure 1 as well as Figure 2 As shown, the manufacturing system has a hopper 10, and preferably, the hopper 10 can be provided with multiple hoppers (in... Figure 2 The diagram shows a silo 10, which is connected to a self-compacting backfill production device 50. Each silo 10 can contain any one of the following materials: brick powder, slag, glass slag, or mineral slag. Here, "connected" means that the silo 10 can receive materials, not necessarily that it is directly connected.

[0044] Furthermore, multiple silos 10 can be connected to the self-compacting backfill production device 50 via conveyor belts 14. Considering that the materials such as brick powder, slag, glass slag, and mineral slag in the silos 10 have small particle sizes, using an open conveyor belt would cause dust to rise during the conveying process and pollute the environment. Therefore, in this embodiment, a sealed conveyor belt is used to convey the raw materials in the silos 10. To facilitate precise control of the feeding amount of the silos 10, a first metering device 13 is installed on the conveyor belt 14. The first metering device 13 can measure the feeding amount of the silos 10 within any time period. The conveying speed of the conveyor belt 14 can be controlled by the metering data of the first metering device 13 to meet the specific feeding requirements of the materials in the silos 10.

[0045] Specifically, the silo 10 may include a raw material storage room 11 and a loading room 12. The manufacturing system also includes a discharge room 60 connected to the silo 10. Dust collection points (exhaust fans) are provided in the raw material storage room 11, the loading room 12 and the discharge room 60, so that the pressure in the discharge room 60, the raw material storage room 11 and the loading room 12 can be set to negative pressure. The discharge room 60 is set as a double-layer sealed room, and an underground passage is provided between the discharge room 60 and the raw material storage room 11. An unloading conveyor belt connecting the discharge room 60 and the raw material storage room 11 is provided in the underground passage, and the unloading conveyor belt is equipped with an unloading metering device.

[0046] Further, the materials are transported to the unloading room 60 for unloading, and the unloaded materials are then conveyed to the raw material storage room 11 via the conveyor belt 14. When the materials in the raw material storage room 11 are to be used, the materials are preferentially conveyed to the loading room 12 via the conveyor belt 14, and then conveyed to the self-compacting backfill production device 50 via the loading room 12. Dust is generated during unloading in the unloading room 60, storage of materials in the raw material storage room 11, and conveying in the loading room 12. To prevent dust from escaping, the unloading room 60 is equipped with two sealed doors spaced 15 meters apart to ensure dust containment. An underground passage is also provided, and the unloading conveyor belt responsible for transporting materials is located in the underground passage. The unloading port is located above the unloading conveyor belt, and an unloading metering device is installed on the unloading conveyor belt, which can not only measure and warn of the weight of the material loaded on the unloading conveyor belt, but also record the total amount of material stored in the raw material storage room 11. Furthermore, by setting up dust collection points (exhaust fans), a slight negative pressure is achieved in the unloading room 60, the raw material storage room 11, and the loading room 12, so that the dust can be concentrated at the air outlet with the negative pressure airflow. A dust collector is installed at the air outlet to further collect the concentrated dust and transport it to the mud pool 70 for recycling.

[0047] Specifically, the manufacturing system also includes multiple silos 20, each containing cement, slag powder and fly ash, and each silo 20 is connected to the self-compacting backfill production device 50.

[0048] Furthermore, the silo 20 is connected to the self-compacting backfill production device 50 via a silo pipe 23. A second metering device 21 is installed on the silo pipe 23. The second metering device 21 can measure the amount of material fed from the silo 20 to the self-compacting backfill production device 50. A first discharge valve 22 is also installed to manage the conveying speed of cement and / or slag powder and / or fly ash. By measuring the material in the silo 20 through the second metering device 21, the first discharge valve 22 is controlled to control the amount of cement and / or slag powder and / or fly ash fed, thereby affecting the ratio of cement and / or slag powder and / or fly ash to the total weight in the self-compacting backfill production device 50, thus meeting the proportioning requirements of the self-compacting backfill.

[0049] Specifically, the manufacturing system also includes a storage tank 30, and a water tank 40 may be provided between the storage tank 30 and the self-compacting backfill production device 50, and the water tank 40 is connected to both the self-compacting backfill production device and the storage tank 30.

[0050] Furthermore, the storage tank 30 contains an admixture, which is preferentially transferred to the water tank 40 to mix with water to form an aqueous solution of the admixture. This aqueous solution is then transferred from the water tank 40 to the self-compacting backfill production device 50. To control the concentration of the admixture aqueous solution, a third metering device 31 and a second discharge valve 32 are provided. During the process of the admixture being transported to the water tank 40, the third metering device 31 measures the amount of admixture fed, and the second discharge valve 32 controls the amount of admixture fed, thus achieving the desired concentration of admixture aqueous solution in the water tank 40.

[0051] Specifically, the manufacturing system also includes a clear water tank 80, which is connected to a water tank 40. The clear water from the clear water tank 80 is transported to the water tank 40 via a fourth metering device 81. A third discharge valve 41 is installed on the pipeline connecting the water tank 40 to the self-compacting backfill production device 50 for transporting the additive aqueous solution.

[0052] Furthermore, the water in water tank 40 is supplied by clear water tank 80, and the water feed rate is measured by the fourth metering device 81. This measurement is then linked with the data obtained by the third metering device 31 to control the preparation of the required additive aqueous solution. In other words, the additive feed rate is based on the water feed rate for proportioning. The prepared additive aqueous solution is controlled by opening and closing the third discharge valve 41 to start or stop the delivery of the additive aqueous solution, thereby improving the proportioning accuracy of the manufacturing system.

[0053] Specifically, the manufacturing system also includes the aforementioned mud pit 70, which contains engineering mud 72. During the feeding and unloading process, dust will be generated in the unloading room 60, raw material storage room 11, and feeding room 12. This dust is collected by the negative pressure airflow generated by the dust collection point (exhaust fan). The system also includes collecting dust generated during the conveying of cement and / or slag powder and / or fly ash from the silo 20 to the self-compacting backfill production device 50, as well as dust generated when the self-compacting backfill production device 50 receives materials from various devices and during the manufacturing of the self-compacting backfill. The dust collected from each device is either uniformly or separately transported to the mud pit 70 for mixing.

[0054] Furthermore, the mud pit 70 can treat dust in an environmentally friendly manner, and the mixed engineering mud 72 can also be used as aggregate for self-compacting backfill. In addition to treating dust, the mud pit 70 can also be used to recycle and reuse wastewater, rainwater, or domestic water generated during the manufacturing system operation, further improving the resource utilization rate of the manufacturing system.

[0055] Specifically, a dust collector is installed in any one of the unloading room 60, raw material storage room 11, loading room 12, silo 20 and self-compacting backfill production device 50 to collect dust.

[0056] Furthermore, considering that dust will rise during operation in the unloading room 60, raw material storage room 11, loading room 12, silo 20, and self-compacting backfill production device 50, dust collectors are installed in each of these spaces to solve dust pollution and improve dust recovery efficiency. This ensures effective dust removal in each space and allows for separate control of dust removal in each space, reducing the ineffective operating time of some dust collectors and improving the dust collection rate. In this embodiment, the dust collector can be a bag filter, which collects the dust through filter material.

[0057] Specifically, multiple silos 20 are arranged around the self-compacting backfill production device 50, and a mud pit 70 is arranged between the self-compacting backfill production device 50 and the feeding room 12.

[0058] Furthermore, multiple silos 20 are arranged radiating outwards from the self-compacting backfill production device 50, making the manufacturing system's footprint more concentrated and facilitating overall equipment management and maintenance. A mud pit 70 is located between the self-compacting backfill production device 50 and the feeding chamber 12, shortening the distance required for dust collection from the self-compacting backfill production device 50 to the feeding chamber 12 and improving dust collection efficiency.

[0059] Third Embodiment

[0060] like Figure 1 as well as Figure 4 , Figure 5 As shown, this embodiment provides a self-compacting backfill manufacturing system with an annual production capacity of 900,000 tons, and the total workshop area is 6,500 m². 2 The system mainly includes: 10 silos, 20 silos, 30 storage tanks, 40 water tanks, 50 self-compacting backfill production devices, 60 unloading rooms, 70 mud pits, and 80 clear water pits. Preferably, the system is equipped with an integrated enclosed plant, and all facilities are located inside the enclosed plant.

[0061] Furthermore, such as Figure 4As shown, the silo 10 mainly includes raw material storage rooms 11 and loading rooms 12. Preferably, there are a total of 8 raw material storage rooms 11, and each raw material storage room 11 is roughly the same size, about 200m². 3 Brick powder, slag, glass slag, and other waste materials are used as aggregates in the production of self-compacting backfill material and are stored in different raw material storage rooms 11 as needed. Storage operations are conducted intermittently, rotating between storage rooms 11 of the same type. Specifically, a material distribution conveyor belt is provided, with its loading end connected to the unloading room 60. Multiple unloading ends are connected to various raw material storage rooms 11.

[0062] In this embodiment, the feeding chamber 12 is preferably set as a feed inlet for the ridge, including an electrically controlled valve and an automatic door. The automatic door can be opened or closed to control the feeding of materials into the ridge. Each feeding chamber 12 is approximately the same size, about 80m². 3 There are a total of 8, and each feeding room 12 is set up in correspondence with each raw material storage room 11.

[0063] In this embodiment, the silo 10 also includes a conveyor belt 14 and a first metering device 13. The aggregate is conveyed from the feeding room 12 to the self-compacting backfill production device 50 via the conveyor belt 14, and is metered by the first metering device 13 during the conveying process on the conveyor belt 14. The first metering device 13 includes a weighing hopper, a sensor, and a vibrator, and is installed on the conveyor belt 14 as needed. After being metered by the first metering device 13, the aggregate is directly conveyed to the self-compacting backfill production device 50.

[0064] Furthermore, each raw material storage room 11 is connected to the unloading room 60, and the unloading room 60 is used to feed materials into each raw material storage room 11. The unloading room 60 is equipped with a semi-underground unloading port and an unloading conveyor belt. The unloading conveyor belt is connected to the semi-underground unloading port and is equipped with an unloading metering device. Aggregates including waste brick powder, waste slag, waste glass slag and waste mineral slag are transported to the plant area by truck, poured into the semi-underground unloading port and fed to the unloading conveyor belt. After being measured by the unloading metering device, the aggregates are then conveyed to the feeding end of the material input belt by the unloading conveyor belt.

[0065] Furthermore, the production system also includes multiple silos 20 for temporary storage of fly ash, slag powder, and cement. Preferably, there are eight silos 20. Figure 4 (As shown in the image, there are 4 silos, each roughly the same size, with a single silo volume of approximately 210 m³.) 3 It has two silos, 20 of which are spare silos and are not used for storing fly ash, cement or slag powder under normal circumstances.

[0066] Specifically, slag powder, cement, and fly ash are all transported to the plant in sealed tank trucks and then pneumatically conveyed to silos 20 for temporary storage via sealed pressurized pipelines. Each silo 20 is equipped with a screw conveyor at its bottom to transport cement and / or slag powder and / or fly ash into the self-compacting backfill production device 50. The silos 20 may include two cement silos, two slag powder silos, and two fly ash silos. Each silo 20 is directly connected to the self-compacting backfill production device 50 via pipeline and is arranged approximately equidistantly around the device, significantly shortening the distance between each silo 20 and the device. Furthermore, the components of each silo 20 are of identical specifications, reducing the design production time and facilitating replacement.

[0067] Furthermore, a second metering device 21 and a first discharge valve 22 are installed between the silo 20 and the self-compacting backfill production device 50. The second metering device 21 is installed on the pipeline connecting the silo 20 and the self-compacting backfill production device 50, and specifically includes a weighing hopper, a sensor, and a vibrator. The second metering device 21 is activated when the material in the silo 20 is conveyed by the screw conveyor to measure the amount of material fed into the silo 20. The first discharge valve 22 is used to control the conveying speed of the material in the silo 20. The amount of material fed into the silo 20 can be controlled by adjusting the opening and closing of the first discharge valve 22.

[0068] In this embodiment, the manufacturing system also includes four storage tanks 30 containing additives, each with a capacity of 10m³. 3 Two of the storage tanks 30 are designated as backup tanks and are not used during routine production. The admixture used in this embodiment is a polycarboxylate solution, packaged in ton drums and transported to the plant by truck. A liquid pump is used to transfer the admixture into the storage tanks 30. The two storage tanks 30 are directly connected to the water tank 40. The admixture in the storage tanks 30 is preferentially transported to the water tank 40 for mixing and stirring to form an admixture aqueous solution, which is then transferred to the self-compacting backfill production unit 50. A third metering device 31 and a second discharge valve 32 are installed between the two storage tanks 30 and the water tank 40. The third metering device 31 includes a weighing hopper, a sensor, and a pipeline pump, used to meter the amount of admixture fed into the water tank 40 at any given time. The conveying rate of the admixture can be increased or decreased by adjusting the opening and closing of the second discharge valve 32, thereby improving the accuracy of the concentration of the required admixture aqueous solution. Meanwhile, a third discharge valve 41 is installed between the water tank 40 and the self-compacting backfill production device 50, and the amount of additive aqueous solution can be controlled by the third discharge valve 41.

[0069] Furthermore, the manufacturing system also includes a clear water tank 80, in which clear water can be pumped to a water tank 40 via a pipeline. A fourth metering device 81 is installed on the pipeline, comprising a weighing hopper, a water supply pump, and a booster pump. The fourth metering device 81 measures the amount of aqueous solution fed from the clear water tank 80 to the water tank 40, and further controls the second discharge valve 32 to adjust the amount of additive fed, thereby improving the concentration accuracy of the additive aqueous solution. A third discharge valve 41 is installed on the pipeline connecting the water tank 40 and the self-compacting backfill production device 50 to control the amount of additive aqueous solution fed into the self-compacting backfill production device 50.

[0070] The main production area mainly includes a self-compacting backfill production device 50. The self-compacting backfill production device 50 is equipped with an inlet (not shown) and an outlet (not shown). The inlet is directly connected to each material conveying device and forms a closed space relative to the outside. After being metered, each material enters through the inlet and is mixed in the self-compacting backfill production device 50. After being fully mixed, the material is directly loaded into a transport vehicle through the outlet and transported out of the factory.

[0071] A control device 51 is installed outside the enclosed factory building. The control device 51 mainly includes an industrial control computer, an electrical control cabinet, an electrical control console, and various electrical components. The control device 51 is communicatively connected to the first metering device 13, the second metering device 21, the third metering device 31, and the fourth metering device 81, and can control the operation of the conveyor belt 14, the first discharge valve 22, the second discharge valve 32, and the third discharge valve 41.

[0072] By controlling the feed amount measured by each metering device through the control device 51, the control device 51 can statistically analyze the proportion of each material in the self-compacting backfill production device 50. Before the self-compacting backfill production device 50 reaches the filling amount, the control device 51 can jointly control the speed of the conveyor belt 14, the opening and closing of the first discharge valve 22, the second discharge valve 32 and the third discharge valve 41, thereby affecting the feed amount of each material to the self-compacting backfill production device 50 per unit time, so as to achieve a precise and efficient feeding ratio.

[0073] like Figure 3 As shown, this system also includes a dust removal system, which is used to collect and treat the dust generated during the storage, feeding, and batching processes of each unit, thereby improving the air quality in the plant. The exhaust gas in this system is divided into two parts: the dust generated when the aggregate is unloaded and transported to the raw material storage room 11, and the dust generated when each batching unit feeds the self-compacting backfill production unit 50 and the silo 20.

[0074] Specifically, dust can be categorized by its source:

[0075] G1 is the storage and unloading dust generated when aggregate is fed from the raw material storage room 11 to the feeding room 12 and when the conveyor belt 14 feeds the aggregate from the feeding room 12 to the self-compacting backfill production device 50.

[0076] G2, unloading dust G2 will be generated when unloading room 60 moves into raw material storage room 11.

[0077] G3 refers to the feeding dust generated when aggregates are conveyed by conveyor belt 14 through the feeding chamber 12.

[0078] G4, the dust sources in the self-compacting backfill production device 50 are divided into two parts. The first part is the dust caused by the height difference after each ingredient enters the mixer; the second part is the dust generated by the mechanical agitation of dry materials that have not come into contact with water during the mixing process. These two parts of dust are collectively referred to as mixed dust G4. In addition, weighing dust is also generated when each device weighs the materials conveyed into the self-compacting backfill production device 50.

[0079] G5 is silo dust formed when slag powder, cement, and fly ash are unloaded into silo 20 and when slag powder, cement, and fly ash are fed from silo 20 into the self-compacting backfill production device 50.

[0080] The dust collection system addresses dust generation in four categories: storage and unloading dust (G1), unloading dust (G2), loading dust (G3), mixed dust (G4), and silo dust (G5). Each component is equipped with corresponding dust treatment facilities.

[0081] Specifically, a mud tank 70 is provided between the self-compacting backfill production device 50 and the raw material storage room 11. The mud tank 70 can hold engineering mud 72, which can be used for the production of self-compacting backfill. Furthermore, the mud tank can collect dust from various devices, achieving the dual benefits of dust recycling and environmental protection. In this embodiment, the mud tank 70 has a volume of 1000 m³. 3 Because sand and gravel accumulate at the bottom during the sedimentation process of the engineering mud 72, a sedimentation depth is reserved in the mud tank 70. The mud tank 70 stores engineering mud 72, which can originate from sources such as mud generated during subway excavation, civil engineering construction, foundation pit construction, and water conservancy projects. The aforementioned engineering mud 72 is transported by vehicle to the plant area and unloaded into the mud tank 70 for temporary storage. Furthermore, dust generated in other units is piped to the mud tank 70. The mud tank 70 is equipped with a mud pump 71, which transports the engineering mud 72 to the self-compacting backfill production unit 50 for dust recycling. The feed rate of the engineering mud 72 can be metered by controlling the conveying speed of the mud pump 71.

[0082] Furthermore, the unloading room 60 is equipped with a dust conveying pipe that connects to the mud tank 70.

[0083] Specifically, the unloading chamber 60 is designed as a double-layered enclosed space, with a distance of approximately 15 meters between the two layers. A buffer zone is set up around the unloading chamber 60. After aggregate transport vehicles enter the buffer zone, the entrance and exit doors of the buffer zone automatically close, achieving the first layer of enclosed space. After the vehicles pass through the buffer zone and enter the unloading chamber 60, the entrance and exit of the unloading chamber 60 automatically close, achieving the second layer of enclosed space. The aggregate transport vehicles begin unloading from the unloading chamber 60. Furthermore, the unloading chamber 60 is equipped with water mist dust suppression devices at its entrance and exit, with an efficiency of up to 50%, further preventing dust from escaping from the unloading chamber 60. Additionally, since the unloading chamber 60 is a closed plant, the enclosed structure can effectively block dust, achieving a dust reduction efficiency of up to 70% for any remaining dust. An underground passage is provided between the unloading room 60 and the raw material storage room 11. An unloading conveyor belt is installed within the underground passage, connecting the two rooms. This conveyor belt is a closed conveyor belt to further reduce dust generated during the transportation of aggregates from the unloading room 60 to the raw material storage room 11. The unloading room 60 may also be equipped with a dust collection point (exhaust fan), creating a slight negative pressure inside. The unloading dust G2 is collected through the negative pressure airflow to the negative pressure ventilation port, achieving a collection efficiency of 95%. The collected unloading dust G2 is then treated by a bag filter dust collector, which achieves a purification efficiency of up to 99%, thus improving the recycling rate of the unloading dust G2. The purified unloading dust G2 is discharged to the mud tank 70 through a dust conveying pipe, allowing it to be reused in production. In this embodiment, the width of the unloading conveyor belt is 1m, and based on the generation rate of the unloading dust G2, the air volume of the branch pipe in the unloading room 60 is set to 4000m³ / h. 3 / h.

[0084] Furthermore, the raw material storage room 11 is equipped with a dust conveying pipe that is connected to the mud tank 70.

[0085] Specifically, the raw material storage room 11 is a closed workshop and may contain a dust collection point (e.g., an induced draft fan). This dust collection point (e.g., the induced draft fan) creates a slight negative pressure within the raw material storage room 11 during unloading. Under this slight negative pressure, the collection efficiency of the unloading dust G1 can reach 95%. The collected unloading dust G1 is then purified by a bag filter, which achieves a purification efficiency of 99%. The purified unloading dust G1 is then discharged to the slurry tank 70 via a dust conveying pipe for reuse in production. Based on the calculation of the processing rate of the unloading dust G1, the total airflow of all branches in the unloading section of the raw material storage room 11 can reach 8000 m³ / s. 3 / h.

[0086] Furthermore, the feeding room 12 is equipped with a dust conveying pipe that is connected to the mud tank 70.

[0087] Specifically, the feeding room 12 is adjacent to and connected to the raw material storage room 11, and both belong to the enclosed plant structure. An air intake (not shown) is installed above the feeding port, equipped with a dust collection point (exhaust fan). The feeding room 12 can be set to a slight negative pressure through the dust collection point (exhaust fan), achieving a 95% efficiency in collecting the feeding dust G3. The feeding dust G3 is further purified by a bag filter, achieving a purification efficiency of 99%. After purification, the feeding dust G3 is discharged to the slurry tank 70 via a dust conveying pipe for reuse in production. The power setting for each branch pipe of the feeding port is a total air volume of 4000 m³ / h. 3 / h.

[0088] Furthermore, a dust conveying pipe is provided between the self-compacting backfill production device 50 and the mud pit 70.

[0089] Specifically, the self-compacting backfill production device 50 includes a fully enclosed main unit chamber, which is mainly composed of color steel sandwich panels. The inlet and outlet are equipped with water mist dust suppression devices and forced dust collection devices, so that the entire main unit chamber can collect dust under negative pressure.

[0090] Furthermore, the forced dust collection device includes a dust collection point (exhaust fan), which is located at the top of the self-compacting backfill production device 50. Dust collected by the dust collection point (exhaust fan) is then transported to the subsequent dust removal device, where it is collected and purified in a sealed environment by a bag filter. Dust collection within the enclosed main unit chamber can improve dust control efficiency to 99%. Any remaining uncaptured dust can naturally settle within the enclosed main unit chamber and will not escape outside the main unit chamber, thus preventing dust pollution.

[0091] Furthermore, dust collection pipes are installed to connect the silos 20 to the mud pool 70. Specifically, each silo 20 is equipped with a dust collection point (exhaust fan) and a silo top dust collector at its top. During the unloading and loading process to the self-compacting backfill production device 50, each silo 20 operates under negative pressure and in a closed manner, ensuring that the generated dust is contained within the silo 20 and collected and purified by the dust collection point (exhaust fan) and the silo top dust collector. The dust collection point (exhaust fan) and the silo top dust collector achieve a control efficiency of up to 99% for the silo dust G5. The treated silo dust G5 is discharged to the mud pool 70 through pipes. The total airflow of the four silos 20 is set to 2000 m³ / h. 3 / h.

[0092] Furthermore, an end-of-line dust removal device 90 is installed between each dust removal pipe and the mud tank 70.

[0093] Specifically, the dust collection pipes connecting various devices converge at one point and are connected to the terminal dust collection device 90. The terminal dust collection device 90 employs a combination of a cyclone dust collector and a bag filter for dust removal. The initial stage uses a cyclone dust collector to remove most of the dust; the cyclone dust removal efficiency is typically 60%–70%, and this system conservatively uses 60%. The bag filter dust removal efficiency can typically reach 99.5%, and this system conservatively uses 99%. Therefore, after comprehensive calculation, the overall efficiency of the terminal dust exhaust gas treatment can reach 99.6%.

[0094] Furthermore, this system also includes a wastewater treatment system and a solid waste treatment system.

[0095] Specifically, the wastewater may include: equipment rinsing wastewater W1 generated from rinsing the mixing equipment in the main unit room; research and development cleaning wastewater W2 generated from cleaning various equipment in the supporting research and development laboratory; vehicle rinsing wastewater W3 generated from cleaning vehicles transporting aggregates and other auxiliary materials before they leave the factory; floor rinsing wastewater W4 generated from cleaning the floors in the factory area and laboratories; oily wastewater W5 generated from the use of the supporting kitchen; and domestic sewage W6.

[0096] For wastewater W1-W4, it can be collected through a wastewater treatment system and discharged into mud tank 70 via pipeline, where it is mixed with engineering mud 72 for recycling as production raw materials. In this embodiment, underground wastewater collection channels are installed under the main engine room, R&D laboratory, vehicle washing area, and factory roads, and these channels are connected to mud tank 70. After W1-W4 are generated, they automatically flow into the channels due to the terrain and then into mud tank 70, where they undergo natural sedimentation. The upper layer of clear water after sedimentation in mud tank 70 flows into clear water tank 80 through an overflow outlet. The clear water in clear water tank 80 can be used for cleaning production equipment, vehicles, and factory floors. W5 can be discharged into the pipeline after oil separation in an oil separator, while W6 can be discharged directly into the pipeline. After treatment, W5 and W6 meet the standards for domestic sewage and are incorporated into the sewage collection pipeline for unified treatment. The wastewater treatment system can reuse the vast majority of the wastewater generated within the system, while a small amount of wastewater is discharged through the sewer system, thus achieving the environmental protection effect of wastewater treatment and recycling.

[0097] Solid waste may include: S1: laboratory slag, waste glass, waste coal ash, waste bricks, additives, cement, etc. (unpacking); S2: waste samples generated from experiments on the formulation of self-compacting backfill material; S3: waste samples generated from product quality inspection; S4: sediment; S5: factory area cleaning; S6: dust not collected by bag filters; S7: filter bags replaced by bag filters; S8: waste mineral oil; S9: waste oily rags; S10: kitchen waste; S11: waste cooking oil; S12: domestic waste.

[0098] For S1, S2, and S7, they can be collected through the solid waste treatment system and transported to material recycling units for material disposal; S3-S6 can be reused in production; S8 and S9 can be entrusted to qualified units for safe disposal; S10 can be collected by waste kitchen waste disposal units designated by the greening and sanitation department; S11 can be collected by waste cooking oil disposal units designated by the greening and sanitation department; S12 can be entrusted to the sanitation department for collection.

[0099] By coordinating dust removal, wastewater treatment, and solid waste treatment systems, the system and its supporting facilities comprehensively calculate the various types of emissions. The dust and exhaust gas removal rate reaches 99.6%; various types of wastewater are effectively and harmlessly treated; and hazardous waste, general industrial solid waste, domestic waste, kitchen waste, and waste cooking oil are all completely removed. This enables the system to meet high emission standards and achieve environmental protection and emission reduction goals.

[0100] Furthermore, through monitoring of each device in this system, it was found that all volume frequencies in this system are within the national standard range and no noise pollution is generated.

[0101] Those skilled in the art will appreciate that, in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, drawing, or description for the purpose of simplification and to aid in understanding one or more of the various inventive aspects. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the appended claims, each inventive aspect may have fewer features than all the features of a single foregoing disclosed embodiment. Therefore, the appended claims following the detailed description are thus explicitly incorporated into that detailed description, wherein each claim stands alone as a separate embodiment of the invention.

[0102] Furthermore, while some embodiments described herein include features included in other embodiments but not others, combinations of features from different embodiments are intended to fall within the scope of the invention and form different embodiments as will be understood by those skilled in the art. For example, any embodiment of the claimed embodiments in the appended claims may be used in any combination.

[0103] It should be noted that, in describing certain features or aspects of the invention, the use of specific terms should not be construed as implying that the term is redefined herein to be limited to any particular characteristic of the invention’s features or aspects associated with the term.

[0104] Numerous specific details are set forth in the description provided herein. However, it should be understood that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description.

Claims

1. A manufacturing system for self-compacting backfill, characterized in that, The manufacturing system includes: Multiple silos, each containing any one of the following materials: brick powder, slag, glass slag, or mineral slag; Multiple silos containing cement, slag powder, or fly ash; Storage tanks containing additives; A water jug, which contains water; In the self-compacting backfill production device, the material in the silo is conveyed to the self-compacting backfill production device via a conveyor belt equipped with a first metering device. The material in the silo is conveyed to the self-compacting backfill production device via a second metering device and a first discharge valve. The second metering device is installed in the silo pipeline connecting the silo and the self-compacting backfill production device. The additive in the storage tank is conveyed to the water tank via a third metering device and a second discharge valve. The additive is mixed with water in the water tank and then conveyed to the self-compacting backfill production device. The unloading room is connected to the silo, which includes a raw material storage room and a loading room. Dust collection points are provided in the unloading room, the raw material storage room, the loading room, the silo, and the self-compacting backfill production device to enable the pressure in the unloading room, the raw material storage room, the loading room, the silo, and the self-compacting backfill production device to be set to negative pressure. The unloading room is configured as a double-layer sealed room, and an underground passage is provided between the unloading room and the raw material storage room. An unloading conveyor belt connecting the unloading room and the raw material storage room is provided in the underground passage, and the unloading conveyor belt is equipped with an unloading metering device. The mud pit contains engineering mud. Dust from the unloading room, the raw material storage room, the feeding room, the silo, and the self-compacting backfill production device is transported to the mud pit. The mud pit is connected to the self-compacting backfill production device via a mud pump to transport the engineering mud mixed with dust to the self-compacting backfill production device for reuse. A clear water tank is connected to the water tank. The clear water from the clear water tank is transported to the water tank via a fourth metering device. A third discharge valve is installed on the pipeline connecting the water tank and the self-compacting backfill production device.

2. The manufacturing system for self-compacting backfill material according to claim 1, characterized in that, A dust collector is installed in any one of the unloading room, the raw material storage room, the loading room, the silo, and the self-compacting backfill production device.

3. The manufacturing system for self-compacting backfill material according to claim 1 or 2, characterized in that, Multiple silos are arranged around the self-compacting backfill production device, and the mud pit is located between the self-compacting backfill production device and the feeding room.

4. The manufacturing system for self-compacting backfill material according to claim 1, characterized in that, It also includes a control device that is communicatively connected to the first metering device, the second metering device, the third metering device, and the fourth metering device, and controls the operation of the conveyor belt, the first discharge valve, the second discharge valve, and the third discharge valve based on the information from the first metering device, the second metering device, the third metering device, and the fourth metering device.

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