Cast-in-situ box girder waste concrete recycling equipment and method

Abstract

The present application relates to the technical field of concrete recycling, and particularly relates to a cast-in-place box girder waste concrete recycling equipment, which comprises a container, a soaking tank, a sedimentation tank and a water storage tank are arranged in the container, the soaking tank is concave at the bottom, the soaking tank is used for water storage, and concrete block screening is carried out in water, and washing and dust reduction are simultaneously realized, a sand setting pipe is communicated with the bottom of the soaking tank, the sand setting pipe is used for waste water circulation between the soaking tank and the sedimentation tank, and the screened-out silt is simultaneously deposited and collected, a partition and a water permeation plate are arranged in the water storage tank, the water permeation plate is used for filtering fine particulate matters suspended in waste water, improving waste water cleanliness, expanding the use range of circulating water, and protecting the circulating water pumping equipment, concrete blocks, silt and powder are screened and filtered by using a screen, a sand filter screen and the water permeation plate, the silt and powder are moved through water flow, meanwhile, the water body shaking can realize self-cleaning of the sand filter screen, the sand filter screen does not need to be frequently replaced, and the use and maintenance cost of the equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of concrete recycling technology, and in particular to a device and method for recycling waste concrete from cast-in-place box girders. Background Technology

[0002] Cast-in-place box girder refers to a structure where a scaffold is erected at the bridge site according to the site conditions, formwork is installed on the scaffold, reinforcing steel is tied, and finally, concrete is poured on-site to form a box-shaped beam structure. During the on-site concrete pouring process, a large amount of waste concrete is generated. To protect the environment, this waste concrete generally needs to be treated or recycled.

[0003] Concrete recycling is an important environmental protection and resource reuse process that involves collecting, processing, and reusing waste concrete as new building materials.

[0004] The aggregates and hardened cement paste in waste concrete can be reused after processing, reducing the mining of natural sand and stone and conserving natural resources. Traditionally, waste concrete is often landfilled or dumped, which not only occupies a lot of land but may also pollute the soil, groundwater, and air. Recycling can effectively reduce these environmental problems; by recycling waste concrete, construction costs can be reduced.

[0005] Existing methods for recycling waste concrete generally fall into two categories. One category involves washing and stirring the concrete at the construction site before it hardens, which separates the cement and sand. The sand and gravel can then be recycled. This method is simple to operate but has many limitations, and wastewater treatment is inconvenient. The cost of recovering internal suspended solids is high, and the recycling effect is not ideal. The other category involves recycling hardened concrete. The recycling workshop crushes and grinds the concrete blocks, and processes and modifies them if necessary. This method is costly and time-consuming, and cannot be quickly utilized at the construction site, thus affecting utilization efficiency. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a waste concrete recycling device and method for cast-in-place box girders.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A waste concrete recycling device for cast-in-place box girders includes a container. Inside the container are a washing tank, a sedimentation tank, and a water storage tank. The bottom of the washing tank is recessed and used to store water for screening concrete fragments in the water, while simultaneously cleaning and dust reduction. A sedimentation pipe is connected to the bottom of the washing tank, and one end of the sedimentation pipe is connected to the bottom of the sedimentation tank. The sedimentation pipe is bent, and a discharge pipe is connected to the lowest point of the bend. The sedimentation pipe is used for wastewater flow between the washing tank and the sedimentation tank, while simultaneously collecting the screened mud and sand. A valve is provided at the outlet of the discharge pipe, and a mud and sand tray is provided below the discharge pipe for collecting the mud and sand accumulated in the washing tank and the sedimentation tank. The water storage tank is equipped with baffles and permeable plates. The permeable plates are used to filter fine particulate matter suspended in the wastewater, improve the cleanliness of the wastewater, expand the scope of circulating water utilization, and protect the circulating water pumping equipment. The baffles are vertically installed inside the water storage tank, and there are mounting seats corresponding to the permeable plates in the middle of the baffles and the water storage tank. The water storage tank is divided into a filtration chamber, a water storage chamber, and a water intake chamber by the baffles and permeable plates. The permeable plates separate the filtration chamber and the water storage chamber. The filtration chamber is connected to the upper part of the sedimentation tank, and the water storage chamber is connected to the water intake chamber. The water intake chamber is equipped with a water intake pipe, and a water pump is installed at the upper end of the water intake pipe. The water pump outlet is connected to a drain pipe and a water supply pipe. A spray pipe is installed on the upper side of the immersion tank, and the water supply pipe is connected to the spray pipe. The water pump is used to pump water to realize the flow of water in the immersion tank, sedimentation tank, and water storage tank, which facilitates the transport of sediment and sand, and at the same time recycles water and reduces water consumption.

[0008] Preferably, a screen frame is mounted on the upper inner side of the immersion tank, and a swing seat is provided on the immersion tank. The swing seat slides horizontally to shake the screen frame to improve the cleaning and screening effect of concrete fragments. The screen frame and the swing seat are detachably connected.

[0009] Preferably, the sieve frame includes a side frame and a bottom sieve. The bottom sieve is located at the bottom of the side frame and is a fine sieve. A grading sieve is located on the inner side of the side frame above the bottom sieve. The grading sieve is a coarse sieve. Both the bottom sieve and the grading sieve are openable.

[0010] Preferably, the grading screen is provided in multiple groups, and the screen aperture diameter of the multiple groups of grading screens gradually increases from bottom to top; storage cavities are left between the multiple groups of grading screens to store concrete fragments of different particle sizes screened out respectively.

[0011] Preferably, a filter screen is provided in the middle of the sedimentation tank, which is adapted to the inner wall of the sedimentation tank. A flow guide plate is provided at the bottom of the sedimentation tank, which is inclined and the lower end of the flow guide plate is corresponding to the sand settling pipe. A cover is provided on the upper side of the sedimentation tank, and an air pump agitation assembly is provided on the cover. The air pump agitation assembly includes a solenoid valve, an air storage tank and a compressor. The air outlet of the air storage tank is connected to the inner side of the sedimentation tank through the solenoid valve.

[0012] Preferably, the filter screen is equipped with a lifting device, which is used to control the filter screen to move slowly or quickly up and down, so that the water can quickly pass through the filter screen from top to bottom and complete the self-cleaning of the filter screen. The lifting device includes a reinforcing frame and a telescopic rod. The reinforcing frame is fixedly connected to the filter screen, one end of the telescopic rod is connected to the inner wall of the sedimentation tank, and the other end of the telescopic rod is connected to the reinforcing frame.

[0013] Preferably, a pH sensor is installed in the water intake chamber to detect the acidity or alkalinity of the circulating water, serving as a data reference for switching wastewater utilization pathways.

[0014] Preferably, the valve is replaced by a sand discharge assembly, which includes a sand filter pipe, a sand discharge auger, and a sand discharge motor. The sand filter pipe is inclined and its lower end is connected to the sand discharge pipe. The sand discharge auger is rotatably installed inside the sand filter pipe, and a water filtration gap is provided between the sand filter pipe and the sand discharge auger. The output shaft of the sand discharge motor is fixedly connected to the sand discharge auger.

[0015] A preferred method for recycling waste concrete from cast-in-place box girders is characterized by comprising the following steps: S1. Statistics and Classification: Waste concrete generated at the construction site of cast-in-place box girder is detected and statistically analyzed, and preliminary classification is carried out. Waste concrete with no recycling value or high recycling cost is marked. Recyclable concrete waste is separated according to its state, type and nature for subsequent processing and reuse. S2. Collection and crushing: The waste concrete is broken down and collected, the reinforcing bars and embedded pipes are cleaned, and the concrete blocks are sorted and utilized. The broken concrete blocks are further crushed by crushing equipment. S3. Washing and screening: The concrete blocks are washed and dusted during the crushing process. The crushed concrete falls into the screen frame and sinks into the immersion tank. The concrete is shaken and screened. The concrete fragments are retained in the screen frame, while the mud, sand and concrete debris are screened out and collected. S4. Grading and screening concrete fragments: Select screens with different aperture sizes to screen concrete fragments to obtain aggregates of different particle sizes. S5. Recycled materials are stored in separate areas. Aggregates, mud, sand and concrete debris of different particle sizes are stored separately and marked for evaluation and use during subsequent construction. S6. Wastewater utilization: Wastewater generated from washing concrete blocks is collected in the immersion tank, then filtered through the sedimentation tank to remove sediment and sand. The upper wastewater flows into the storage tank for further filtration and is reserved for later use.

[0016] Preferably, in step S1, waste concrete with no recycling value or high recycling cost is treated as waste and not recycled to control costs; among recyclable concrete waste, uncured concrete is cleaned and mixed into new concrete for direct use, or used alone for casting other concrete products; cured concrete blocks are classified according to type and properties, and concrete blocks of the same type are processed in the same batch.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Before recycling, the waste concrete at the construction site is tested and counted, which facilitates rapid classification and processing, making the recycling more standardized and ensuring recycling quality. At the same time, the washing tank, sedimentation tank and water storage tank are loaded into containers, which can be directly loaded onto vehicles for easy transportation. This invention can cope with the harsh environment of the construction site, facilitate the rapid recycling and utilization of waste concrete at the construction site, shorten the recycling cycle, effectively control costs, and is more economical and efficient. 2. This invention utilizes a sieve, a filter screen, and a permeable plate to screen and filter concrete blocks, mud, and powder. The water flow causes the mud and powder to move, and their buoyancy and sinking properties are used for targeted collection. In addition, the flowing water can clean the concrete blocks and reduce dust. At the same time, the water movement can achieve self-cleaning of the filter screen, eliminating the need for frequent replacement of the filter screen and reducing the cost of equipment use and maintenance. 3. This invention uses a pH sensor to detect the acidity or alkalinity of the circulating water as a data reference for switching wastewater utilization pathways, thus recycling wastewater, saving water resources, and preventing excessively high acidity or alkalinity from affecting equipment operation. The water can then be used for other purposes, such as mixing concrete, concrete spraying and curing, or washing engineering equipment. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the process of a method for recycling waste concrete from cast-in-place box girders proposed in this invention. Figure 2 This is a first-view three-dimensional structural diagram of a waste concrete recycling device for cast-in-place box girders proposed in this invention; Figure 3 This is a first-view three-dimensional cross-sectional structural diagram of a waste concrete recycling device for cast-in-place box girders proposed in this invention; Figure 4 This is a second-view three-dimensional structural diagram of a waste concrete recycling device for cast-in-place box girders proposed in this invention; Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point A; Figure 6 This is a top view schematic diagram of a waste concrete recycling device for cast-in-place box girders proposed in this invention; Figure 7 This is a schematic diagram of the right sectional view of a waste concrete recycling device for cast-in-place box girders proposed in this invention. Figure 8 This is a schematic diagram of the main sectional view of a waste concrete recycling device for cast-in-place box girders proposed in this invention. Figure 9 This is a schematic diagram of the screen frame structure of a waste concrete recycling device for cast-in-place box girders proposed in this invention; Figure 10 This is a schematic diagram of the sand discharge component structure of a cast-in-place box girder waste concrete recycling device proposed in this invention; Figure 11 This is a schematic diagram of the air pump agitator assembly of a waste concrete recycling device for cast-in-place box girders proposed in this invention.

[0019] In the diagram: 1. Container; 11. Ladder; 2. Immersion tank; 20. Settling pipe; 21. Discharge pipe; 22. Filter pipe; 23. Screw conveyor; 24. Discharge motor; 3. Screen frame; 30. Side frame; 31. Hanging lug; 32. Grading screen; 33. Bottom screen; 4. Spray pipe; 41. Water supply pipe; 5. Swing seat; 51. Hydraulic cylinder; 52. Slide seat; 6. Sedimentation tank; 61. Filter screen; 610. Lifting device; 62. Pipe; 621. Sealing door; 63. Guide plate; 64. Cover; 65. Gas tank; 66. Compressor; 7. Water pump; 71. Drainage pipe; 72. Water intake pipe; 8. Water storage tank; 81. Filter chamber; 82. Drainage plate; 83. Water storage chamber; 84. Partition; 85. Water intake chamber; 9. Sediment tray. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Reference Figure 1-11 A device and method for recycling waste concrete from cast-in-place box girders, the specific steps of which include: S1. Statistics and Classification: Waste concrete generated at the construction site of cast-in-place box girder is tested and statistically analyzed, and preliminary classification is carried out based on the value, strength, acidity / alkalinity, and sand-gravel ratio of the waste concrete. Waste concrete that has no recycling value or high recycling cost is marked as waste and treated in an environmentally friendly and harmless manner to avoid environmental pollution. It is not recycled and reused in order to control costs. Recyclable concrete waste is separated according to its state, type and properties for subsequent processing and reuse to obtain qualified recycled aggregates or recycled cementitious materials. For example, in recyclable concrete waste, uncured concrete can be cleaned and mixed into new concrete for direct use, or used alone to cast other concrete products. However, concrete diluted by water cannot be used directly. For example, concrete collected when cleaning concrete mixing plants and transport vehicles cannot be used directly because it is diluted by water but has not yet solidified. It can be directly put into the screen frame 3 for cleaning to separate cement, sand and gravel. The solidified concrete blocks are then classified according to type and properties, and concrete blocks of the same type are processed in the same batch to avoid mixing concrete blocks of different qualities together, which would affect recycling and reuse. Solidified concrete blocks are generally crushed. If necessary, recycled aggregates can be further processed, such as by grinding and calcining, to improve their physical and mechanical properties or change their chemical properties. However, this requires specialized equipment for grinding and calcination. To control costs and shorten the recycling cycle, on-site recycling can be carried out by directly crushing and screening the aggregates, thereby improving recycling efficiency and reducing costs. In addition, hardened cement paste can be separated from the waste concrete of cast-in-place box girders, which can be used to prepare recycled cementitious materials. Recycled aggregates can be used as admixtures in new concrete, reducing the need for new raw materials by incorporating them in a certain proportion. At the same time, recycled aggregates can also be used in road foundations and pavement, water conservancy projects and coastal protection projects, underground facilities, etc. Recycled cementitious materials: These are prepared from hardened cement paste separated from waste concrete. They have hydration activity and can be used in foundation modification materials, etc. Customized concrete products: By using customized molds, waste concrete from cast-in-place box girders can be made into concrete bricks, curb stones, post-cast strip covers, scaffolding blocks, and other products.

[0022] S2. Collection and crushing: The waste concrete is broken down and collected, the reinforcing bars and embedded pipes are cleaned, and the concrete blocks are sorted and utilized. The broken concrete blocks are further crushed by crushing equipment. The crushing equipment uses a crushing bucket or crushing station. The operating parameters of the crushing equipment are determined based on the test results of the concrete blocks. The lower the strength of the concrete blocks, the smaller the particle size should be selected for crushing to avoid the recycled aggregate affecting the quality of the new concrete after pouring due to insufficient strength.

[0023] S3. Cleaning and screening: The crushing bucket grabs concrete blocks and crushes them. The concrete blocks are washed and dusted during the crushing process. The crushed concrete falls into the screen frame 3 and sinks into the immersion tank 2. The concrete is shaken and screened. The concrete fragments remain in the screen frame 3, while the mud, sand and concrete debris are screened out and collected. The immersion tank 2 is used to store water and screen concrete fragments in the water, while simultaneously cleaning and dust reduction. The bottom of the immersion tank 2 is recessed to facilitate the collection of mud and sand. The bottom of the immersion tank 2 is connected to a sedimentation pipe 20, one end of which is connected to the bottom of the sedimentation tank 6. The sedimentation pipe 20 is bent, and the lowest point of the bend in the sedimentation pipe 20 is connected to a discharge pipe 21. The discharge pipe 21 is used to discharge mud and sand, and the sedimentation pipe 20 is used for wastewater circulation between the immersion tank 2 and the sedimentation tank 6, while simultaneously collecting the screened mud and sand. The outlet of the sand discharge pipe 21 is equipped with a valve to facilitate the periodic discharge of mud and sand. The sand discharge pipe 21 is equipped with a mud and sand tray 9 on the lower side. The mud and sand tray 9 is used to collect the mud and sand accumulated in the washing tank 2 and the sedimentation tank 6. After drying, the mud and sand can be used as admixtures and directly added to new concrete to reduce aggregate consumption and realize resource recycling. The sedimentation tank 6 is equipped with a cover 64 on the upper side, and an air pump agitation assembly is provided on the cover 64. The air pump agitation assembly includes a solenoid valve, an air tank 65 and a compressor 66. The air outlet of the air tank 65 is connected to the inside of the sedimentation tank 6 through the solenoid valve. An exhaust valve is installed on the cover 64. Multiple sets of air tanks 65 are provided. During operation, air is released alternately to improve the agitation effect, cause the water in the immersion tank 2 and sedimentation tank 6 to slosh, flush away concrete blocks and silt, and clear and dredge the pipes. In addition, the valve can be replaced with a sand discharge assembly, which includes a sand filter pipe 22, a sand discharge auger 23 and a sand discharge motor 24. The sand filter pipe 22 is inclined and its lower end is connected to the sand discharge pipe 21. The outlet of the sand filter pipe 22 is set at the higher end. The height of the outlet of the sand filter pipe 22 is set with reference to the height of the immersion tank 2 to avoid affecting the water storage of the immersion tank 2. The sand discharge auger 23 is rotatably installed inside the sand filter pipe 22. A water filtration gap is provided between the sand filter pipe 22 and the sand discharge auger 23. The output shaft of the sand discharge motor 24 is fixedly connected to the sand discharge auger 23. The sand discharge motor 24 controls the sand discharge auger 23 to rotate and convey the sand upward. At the same time, the wastewater flows out along the water filtration gap and accumulates in the lower half of the sand filter pipe 22, ensuring that the outlet of the sand filter pipe 22 discharges sand, thereby avoiding water loss during sand discharge and effectively ensuring wastewater utilization efficiency. The sand sludge tray 9 is correspondingly installed on the lower side of the outlet of the sand filter pipe 22. The screen frame 3 is mounted on the upper part of the inner side of the immersion tank 2. The immersion tank 2 is equipped with a swing seat 5. The swing seat 5 slides horizontally to shake the screen frame 3 to improve the cleaning and screening effect of concrete fragments. The screen frame 3 and the swing seat 5 are detachably connected. The screen frame 3 is provided with hanging ears 31 on both sides. The swing seat 5 includes a hydraulic cylinder 51 and a slide seat 52. The hydraulic cylinder 51 controls the slide seat 52 to slide horizontally. The hanging ears 31 are embedded in the mounting groove on the upper side of the slide seat 52 to achieve a detachable connection.

[0024] S4. Grading and screening concrete fragments: Select screens with different aperture sizes to screen concrete fragments to obtain aggregates of different particle sizes. Determine the type of sieve frame to use based on the amount of concrete debris to be processed; Example 1: If a large batch of the same type of concrete fragments needs to be processed, the screen frame 3 uses a single-layer screen to simply screen the concrete fragments and mud and sand, and then quickly screen them through other screening equipment. Example 2: If a small batch of concrete fragments is being processed, a multi-layer screen frame 3 is used. The screen frame 3 includes a side frame 30 and a bottom screen 33. The bottom screen 33 is located at the bottom of the side frame 30 and is a fine screen. As needed, the side wall of the side frame 30 can be equipped with a screen or have screen holes to improve water flow and screening efficiency. At least one set of grading screens 32 is provided on the inner side of the side frame 30 above the bottom screen 33. When there is a single grading screen 32, it is generally selected as a coarse screen. If there are multiple grading screens 32, they are arranged vertically and stacked. The diameter of the screen holes of the multiple grading screens 32 gradually increases from bottom to top, thereby intercepting concrete fragments of different particle sizes. Storage cavities are left between the multiple sets of grading screens 32 for storing concrete fragments of different particle sizes that have been screened out. Both the bottom screen 33 and the grading screens 32 are designed to open and close, and can be opened and closed by means of pins or buckles, so as to facilitate the removal of concrete fragments.

[0025] S5. Recycled materials are stored in separate areas, dried or humidified to control moisture content. Aggregates, mud, sand and concrete debris of different particle sizes are stored separately and marked, waiting for quality assessment and use during subsequent construction. They can be promptly applied to concrete mixing for different requirements at the construction site without repeated transportation and processing. S6. Wastewater utilization: The crushing bucket operates above the immersion tank 2, which facilitates water spraying for dust removal. At the same time, the wastewater generated from washing concrete blocks can flow into the immersion tank 2. The concrete fragments crushed by the crushing bucket fall into the screen frame 3 for cleaning. The wastewater passes through the sedimentation tank 6 for sedimentation. The middle of the sedimentation tank 6 is equipped with a filter screen 61, which is adapted to the inner wall of the sedimentation tank 6. The filter screen 61 filters out mud and sand. The wastewater in the upper layer of the sedimentation tank 6 flows into the water storage tank 8 for further filtration and is reserved for later use. The bottom of the sedimentation tank 6 is provided with a flow guide plate 63. The flow guide plate 63 is set at an angle, and the lower end of the flow guide plate 63 is set to correspond with the sedimentation pipe 20, so as to facilitate the introduction of the sedimented silt into the sedimentation pipe 20 for recycling. The filter screen 61 is equipped with a lifting device 610. The lifting device 610 is used to control the filter screen 61 to move slowly or quickly up and down, so that the water can quickly pass through the filter screen 61 from top to bottom, and complete the self-cleaning of the filter screen 61. The lifting device 610 includes a reinforcing frame and a telescopic rod. The reinforcing frame is fixedly connected to the filter screen 61. One end of the telescopic rod is connected to the inner wall of the sedimentation tank 6, and the other end of the telescopic rod is connected to the reinforcing frame. The water storage tank 8 is equipped with a partition 84 and a seepage plate 82. The partition 84 is vertically installed inside the water storage tank 8. The partition 84 and the middle of the water storage tank 8 are equipped with a mounting seat corresponding to the seepage plate 82. The seepage plate 82 is placed horizontally to filter fine particulate matter suspended in the wastewater, improve the cleanliness of the wastewater, expand the utilization range of the circulating water, protect the circulating water pumping equipment, and avoid fine particles causing wear or blockage of the pump parts. The water storage tank 8 is divided into a filter chamber 81, a water storage chamber 83, and a water intake chamber 85 by a partition 84 and a permeation plate 82. The permeation plate 82 separates the filter chamber 81 from the water storage chamber 83. The filter chamber 81 is connected to the upper part of the sedimentation tank 6 through a pipe 62. The pipe 62 is equipped with a sealing door 621, which can be opened and closed as needed to control the water level. Wastewater flows from the sedimentation tank 6 into the filter chamber 81 and is filtered by the permeation plate 82 to remove fine particulate matter. The water storage chamber 83 is connected to the water intake chamber 85 and is used to store the filtered clean water for recycling. The water intake chamber 85 is equipped with a pH sensor to detect the acidity or alkalinity of the circulating water. This serves as a data reference for switching wastewater utilization methods. Wastewater from soaking and cleaning concrete blocks is alkaline, so pH monitoring is necessary. After multiple uses, to prevent excessively high acidity or alkalinity from affecting equipment operation, the water should be promptly reused for other purposes, such as mixing concrete, concrete spraying and curing, or rinsing engineering equipment. When the circulating water is discharged, a new clean water source should be introduced promptly to dilute the acidity or alkalinity of the circulating water. The water intake chamber 85 is equipped with a water intake pipe 72, and a water pump 7 is installed at the upper end of the water intake pipe 72. The outlet of the water pump 7 is connected to a drain pipe 71 and a water supply pipe 41. A spray pipe 4 is installed on the upper side of the immersion tank 2. The water supply pipe 41 is connected to the spray pipe 4. The water pump 7 is used to pump water to realize the flow of water in the immersion tank 2, sedimentation tank 6 and water storage tank 8, which facilitates the transport of sediment and at the same time recycles water and reduces water consumption.

[0026] Specific steps for concrete recycling: Construction workers sorted out and counted the waste concrete that needed to be recycled, and used equipment such as impact drills and hydraulic breakers to break the waste concrete into concrete blocks. Then, the concrete blocks were grabbed by the crushing bucket and crushed on the upper side of the screen frame 3. At the same time, the water pump 7 drew clean water from the water intake chamber 85 and sprayed it out through the spray pipe 4 to wet and remove dust from the concrete fragments in the crushing bucket. Uncured concrete can also be directly put into screen frame 3 for washing and separation, saving the crushing work, and the separation effect of cement and sand is better, and the recycling rate is higher. After the solidified waste concrete is broken up, the resulting concrete fragments are poured into the screen frame 3 for washing and screening. The swaying seat 5 controls the screen frame 3 to shake, and the concrete fragments are stirred. The mud, sand and concrete debris are screened out through the screen. The screen frame 3 retains large concrete fragments. The crane lifts the screen frame 3 out and removes the concrete fragments, which are used as aggregate for concrete mixing, replacing gravel. The silt and debris settle into the sedimentation pipe 20. When the water level in the washing tank 2 rises, some wastewater flows into the sedimentation tank 6. The filter screen 61 intercepts the silt, which facilitates sedimentation and centralized collection and treatment. The filter screen 61 can be directly fixed in the sedimentation tank 6. Since the water flows upward from the bottom of the filter screen 61, the clogging of the filter screen 61 can be reduced, the equipment maintenance cost can be reduced, the replacement frequency of the filter screen 61 can be reduced, and its service life can be extended. Or such as Figure 11 As shown, an air pump agitation assembly is used to seal the upper part of the sedimentation tank 6 through the cover 64 and the sealing door to close the pipe 62, forming a closed cavity in the upper part of the sedimentation tank 6. The compressor 66 fills the air storage tank 65 with air and compresses and stores energy. After the equipment has been working for a period of time, the solenoid valve is opened periodically, and the airflow rushes into the sedimentation tank 6, squeezing the water. The exhaust valve then discharges the air, causing the water to shake and clean the filter screen 61. At the same time, it drives the sand settling pipe 20 and the water in the immersion tank 2 to shake, causing the settled silt to start to flow, making it easier to collect and treat, while also serving as a blockage clearing function. In addition, the filter screen 61 can be modified to be movable. The lifting device 610 controls the filter screen 61 to move up and down slowly or quickly, so that the water can quickly pass through the filter screen 61 from top to bottom, or impact the filter screen 61 to make it vibrate. In conjunction with the air pump agitation component, the filter screen 61 can be self-cleaned. Water above the filter screen 61 flows into the filter chamber 81 and is filtered by the permeation plate 82 to remove suspended small particles of dust and powder. The wastewater is filtered and stored in the water storage chamber 83 for easy extraction by the water pump 7, thus avoiding damage to the water pump 7 and other pipeline components. Small dust particles accumulated on the permeable board 82 settle and clump together. Construction workers use a ladder 11 to regularly clean them up, collect them, and send them to the recycling production workshop to make recycled cementitious materials, saving grinding work and reducing recycling costs. Alternatively, hooks can be installed on the permeable plate 82, and a crane can be used to quickly replace the permeable plate 82 directly. Sediment can be cleaned up at other work stations to ensure that the operation of the equipment is not affected. The permeable board 82 is made of environmentally friendly materials such as cement, sand, slag, and fly ash under high pressure, or directly cast into boards with cement. The production cost is low. The rigid permeable board 82 is easy to clean. The caking powder can be directly scraped off with a scraper and washed with a high-pressure water gun. It is convenient, quick and easy, and has low use and maintenance costs. The immersion tank 2, sedimentation tank 6 and water storage tank 8 are installed together in a container 1 for easy movement and handling.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

Claims

1. A waste concrete recycling device for cast-in-place box girder, comprising a container, characterized in that, The container is equipped with a washing tank, a sedimentation tank, and a water storage tank. The bottom of the washing tank is recessed and is used to store water for screening concrete fragments in the water, simultaneously achieving cleaning and dust reduction. The bottom of the washing tank is connected to a sedimentation pipe, one end of which is connected to the bottom of the sedimentation tank. The sedimentation pipe is curved, and the lowest point of the curve is connected to a discharge pipe. The sedimentation pipe is used for wastewater flow between the washing tank and the sedimentation tank, while simultaneously collecting the screened silt. The outlet of the discharge pipe is equipped with a valve, and a silt tray is located below the discharge pipe to collect the silt accumulated in the washing tank and the sedimentation tank. The water storage tank is equipped with a partition and a seepage plate. The seepage plate is used to filter fine particulate matter suspended in the wastewater, improve the cleanliness of the wastewater, expand the scope of circulating water utilization, and protect the circulating water pumping equipment. The partition is vertically installed inside the water storage tank, and the partition and the middle of the water storage tank are provided with mounting seats corresponding to the seepage plate. The water storage tank is divided into a filtration chamber, a water storage chamber, and a water intake chamber by a partition and a permeable plate. The permeable plate separates the filtration chamber from the water storage chamber. The filtration chamber is connected to the upper part of the sedimentation tank. The water storage chamber is connected to the water intake chamber. A water intake pipe is provided in the water intake chamber. A water pump is provided at the upper end of the water intake pipe. The outlet of the water pump is connected to a drain pipe and a water supply pipe. A spray pipe is provided on the upper side of the immersion tank. The water supply pipe is connected to the spray pipe. The water pump is used to pump water to realize the flow of water in the immersion tank, sedimentation tank, and water storage tank, which facilitates the transport of sediment and at the same time recycles water and reduces water consumption. The sedimentation tank is equipped with a filter screen in the middle, which is adapted to the inner wall of the sedimentation tank. The bottom of the sedimentation tank is equipped with a flow guide plate, which is inclined and the lower end of the flow guide plate is corresponding to the sedimentation pipe. The sedimentation tank is provided with a cover on the upper side, and an air pump agitation assembly is provided on the cover. The air pump agitation assembly includes a solenoid valve, an air storage tank and a compressor. The air outlet of the air storage tank is connected to the inside of the sedimentation tank through the solenoid valve. The filter screen is equipped with a lifting device, which is used to control the filter screen to move slowly or quickly up and down, so that the water can quickly pass through the filter screen from top to bottom and complete the self-cleaning of the filter screen. The valve is replaced by a sand discharge assembly, which includes a sand filter pipe, a sand discharge auger, and a sand discharge motor. The sand filter pipe is inclined and its lower end is connected to the sand discharge pipe. The sand discharge auger is rotatably installed inside the sand filter pipe, and a water filtration gap is provided between the sand filter pipe and the sand discharge auger. The output shaft of the sand discharge motor is fixedly connected to the sand discharge auger.

2. The waste concrete recycling equipment for cast-in-place box girders according to claim 1, characterized in that, A screen frame is mounted on the upper inner side of the immersion tank, and a swing seat is provided on the immersion tank. The swing seat slides horizontally to shake the screen frame to improve the cleaning and screening effect of concrete fragments. The screen frame and the swing seat are detachably connected.

3. The waste concrete recycling equipment for cast-in-place box girders according to claim 2, characterized in that, The sieve frame includes a side frame and a bottom sieve, the bottom sieve being disposed at the bottom of the side frame and being a fine sieve. The inner side of the side frame is provided with a grading screen above the bottom screen. The grading screen is a coarse screen. Both the bottom screen and the grading screen are designed to open and close.

4. The waste concrete recycling equipment for cast-in-place box girders according to claim 3, characterized in that, The grading screen is provided in multiple sets, and the diameter of the screen holes in the multiple sets of grading screens gradually increases from bottom to top; Storage cavities are provided between the multiple sets of grading screens to store concrete fragments of different particle sizes screened out.

5. The waste concrete recycling equipment for cast-in-place box girders according to claim 1, characterized in that, The lifting device includes a reinforcing frame and a telescopic rod. The reinforcing frame is fixedly connected to the filter screen, one end of the telescopic rod is connected to the inner wall of the sedimentation tank, and the other end of the telescopic rod is connected to the reinforcing frame.

6. The waste concrete recycling equipment for cast-in-place box girders according to claim 1, characterized in that, The water intake chamber is equipped with a pH sensor to detect the acidity or alkalinity of the circulating water, serving as a data reference for switching wastewater utilization pathways.

7. A method for recycling waste concrete from cast-in-place box girders using a waste concrete recycling device for cast-in-place box girders according to any one of claims 1 to 6, characterized in that, Including the following steps: S1. Statistics and Classification: Waste concrete generated at the construction site of cast-in-place box girder is detected and statistically analyzed, and preliminary classification is carried out. Waste concrete with no recycling value or high recycling cost is marked. Recyclable concrete waste is separated according to its state, type and nature for subsequent processing and reuse. S2. Collection and crushing: The waste concrete is broken down and collected, the reinforcing bars and embedded pipes are cleaned, and the concrete blocks are sorted and utilized. The broken concrete blocks are further crushed by crushing equipment. S3. Washing and screening: The concrete blocks are washed and dusted during the crushing process. The crushed concrete falls into the screen frame and sinks into the immersion tank. The concrete is shaken and screened. The concrete fragments are retained in the screen frame, while the mud, sand and concrete debris are screened out and collected. S4. Grading and screening concrete fragments: Select screens with different aperture sizes to screen concrete fragments to obtain aggregates of different particle sizes. S5. Recycled materials are stored in separate areas. Aggregates, mud, sand and concrete debris of different particle sizes are stored separately and marked for evaluation and use during subsequent construction. S6. Wastewater utilization: Wastewater generated from washing concrete blocks is collected in the immersion tank, then filtered through the sedimentation tank to remove sediment and sand. The upper wastewater flows into the storage tank for further filtration and is reserved for later use.

8. The method for recycling waste concrete from cast-in-place box girders using a waste concrete recycling equipment for cast-in-place box girders according to claim 7, characterized in that, In step S1, waste concrete with no recycling value or high recycling cost is treated as waste and not recycled in order to control costs. Among recyclable concrete waste, uncured concrete can be cleaned and mixed into new concrete for direct use, or used alone for casting other concrete products. Cured concrete blocks are classified according to type and properties, and concrete blocks of the same type are processed in the same batch.

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