Cast-in-place box girder waste concrete recovery equipment and method

Abstract

The invention relates to the technical field of concrete recycling, in particular to cast-in-place box girder waste concrete recycling equipment which comprises a container, an immersion cleaning box, a sediment box and a water storage box are arranged in the container, the bottom of the immersion cleaning box is arranged in a downwards-concave mode, and the immersion cleaning box is used for storing water, conducting concrete fragment screening work in water and synchronously achieving cleaning and dust falling. The bottom of the immersion cleaning box is communicated with a desilting pipe, and the desilting pipe is used for wastewater circulation between the immersion cleaning box and the settling box and meanwhile deposits and collects screened silt; a partition plate and a water seepage plate are arranged in the water storage tank, and the water seepage plate is used for filtering suspended fine particulate matters in wastewater, improving the cleanliness of the wastewater, expanding the utilization range of circulating water and protecting circulating water pumping equipment; concrete blocks, silt and powder are screened and filtered through the screen, the sand filter screen and the water seepage plate, the silt and the powder are driven to move through water flowing, meanwhile, self-cleaning of the sand filter screen can be achieved through water shaking, the sand filter screen does not need to be frequently replaced, and the equipment use and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete recycling, and particularly to a waste concrete recycling device and method for cast-in-place box girders. Background Art

[0002] A cast-in-place box girder refers to building a support according to the on-site situation at the bridge location, then installing formwork and tying steel bars on the support, and finally pouring concrete on-site to form a box-shaped beam structure. During the on-site concrete pouring process, a large amount of waste concrete will be generated. In order to protect the environment, it is generally necessary to treat or recycle the waste concrete.

[0003] Concrete recycling is an important environmental protection and resource recycling process, which involves collecting, treating and reusing waste concrete into new building materials.

[0004] Components such as aggregates and hardened cement paste in waste concrete can be reused after treatment, reducing the exploitation of natural raw materials such as natural sand and stone, and saving natural resources; traditionally, waste concrete is often landfilled or stacked, which not only occupies a large amount of land, but may also cause pollution to soil, groundwater and air. Recycling can effectively reduce these environmental problems; by recycling waste concrete, the construction cost can be reduced.

[0005] The existing waste concrete recycling is generally divided into two categories. One is the concrete that has not yet solidified at the construction site. By stirring and washing with clean water, the cement and sand and gravel are separated, and the sand and stones can be recycled. The operation is simple, but there are many limitations, and the sewage treatment is inconvenient. The cost of recycling internal suspended solids is high, and the recycling effect is not ideal. The other is the recycling treatment of solidified concrete. The recycling production workshop crushes and grinds the concrete blocks, and processes and modifies them if necessary. The cost of recycling and reuse is high and the cycle is long, and it cannot be quickly utilized at the construction site, affecting the utilization efficiency. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies in the prior art and propose a waste concrete recycling device and method for cast-in-place box girders.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions: A cast-in-place box girder waste concrete recycling device, including a container, in which a washing tank, a sedimentation tank and a water storage tank are arranged. The bottom of the washing tank is recessed and used for storing water, and the screening work of concrete fragments is carried out in the water, realizing cleaning and dust reduction simultaneously. A sand sedimentation pipe is connected to the bottom of the washing tank, one end of the sand sedimentation pipe is connected to the bottom of the sedimentation tank, and the sand sedimentation pipe is bent. The lowest point of the bent sand sedimentation pipe is connected with a sand discharge pipe. The sand sedimentation pipe is used for the waste water circulation between the washing tank and the sedimentation tank, and at the same time deposits and collects the screened sand and sediment. A valve is provided at the outlet of the sand discharge pipe, and a sand and sediment tray is provided on the lower side of the sand discharge pipe. The sand and sediment tray is used for storing the sand and sediment accumulated and precipitated in the washing tank and the sedimentation tank; A partition board and a water seepage board are arranged in the water storage tank. The water seepage board is used for filtering fine particulate matter suspended in the waste water, improving the cleanliness of the waste water, expanding the scope of recycled water utilization, and protecting the pumping equipment of the circulating water body. The partition board is vertically arranged inside the water storage tank, and mounting seats corresponding to the water seepage board are arranged in the middle of the partition board and the water storage tank; The water storage tank is divided into a filtering chamber, a water storage chamber and a water pumping chamber by the partition board and the water seepage board. The water seepage board separates the filtering chamber from the water storage chamber. The filtering chamber communicates with the upper part of the sedimentation tank. The water storage chamber communicates with the water pumping chamber. A water pumping pipe is arranged in the water pumping chamber. A water pump is arranged at the upper end of the water pumping pipe. The water outlet of the water pump is connected with a drain pipe and a water supply pipe. A spray pipe is arranged above the washing tank. The water supply pipe communicates with the spray pipe. The water pump is used for pumping water bodies to realize the flow of water bodies in the washing tank, the sedimentation tank and the water storage tank, facilitating the transportation of sand and sediment, and at the same time recycling the water cycle and reducing water resource consumption.

[0008] Preferably, a screen frame is erected on the upper part inside the washing tank. A swing seat is arranged on the washing 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 screen frame includes a side frame and a bottom screen mesh. The bottom screen mesh is arranged at the bottom of the side frame. The bottom screen mesh is a fine screen mesh; A grading screen mesh is arranged above the bottom screen mesh inside the side frame. The grading screen mesh is a coarse screen mesh. Both the bottom screen mesh and the grading screen mesh are arranged in an openable and closable manner.

[0010] Preferably, there are multiple groups of grading screen meshes. The diameters of the screen holes of the multiple groups of grading screen meshes gradually increase from bottom to top; A storage cavity is left between the multiple groups of grading screen meshes for storing concrete fragments of different particle sizes screened out respectively.

[0011] Preferably, a filter sand mesh is arranged in the middle of the sedimentation tank. The filter sand mesh is adapted to the inner wall of the sedimentation tank. A guide flow plate is arranged at the bottom of the sedimentation tank. The guide flow plate is inclined. The lower end of the guide flow plate corresponds to the sand sedimentation pipe. A cover is arranged on the upper side of the sedimentation tank. An air pump stirring assembly is arranged on the cover. The air pump stirring assembly includes an electromagnetic valve, a gas storage tank and a compressor. The air outlet of the gas storage tank is communicated with the inside of the sedimentation tank through the electromagnetic valve.

[0012] Preferably, a lifting device is provided on the sand filter screen. The lifting device is used to control the slow or fast up-and-down movement of the sand filter screen, so as to prompt the water body to quickly pass through the sand filter screen from top to bottom, and complete the self-cleaning of the sand filter screen. The lifting device includes a reinforcing frame and a telescopic rod. The reinforcing frame is fixedly connected to the sand 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 provided in the water suction cavity to detect the acidity and alkalinity of the circulating water body, which is used as a data reference for switching the waste water utilization path.

[0014] Preferably, the valve is replaced with a sand discharging assembly. The sand discharging assembly includes a sand filter pipe, a sand discharging auger and a sand discharging motor. The sand filter pipe is inclined and communicates with the sand discharging pipe at the lower end. The sand discharging auger is rotatably arranged in the sand filter pipe. A water filtering gap is provided between the sand filter pipe and the sand discharging auger. The output shaft of the sand discharging motor is fixedly connected to the sand discharging auger.

[0015] Preferably, a method for recycling waste concrete of cast-in-situ box girders is characterized by including the following steps: S1. Statistics and classification: Detect and count the waste concrete that appears at the construction site of cast-in-situ box girders, and conduct preliminary classification. Mark the waste concrete with no recycling value or high recycling cost, and separate the recyclable concrete waste by state, type, and property for subsequent treatment and reuse. S2. Collection and crushing: Disassemble and collect the waste concrete, clean the steel bars and embedded pipes, and use them separately. The disassembled concrete blocks are further crushed by a crushing device. S3. Cleaning and screening: Wash and remove dust from the concrete blocks during the crushing process. The crushed concrete falls into the sieve frame and sinks into the immersion tank, and is shaken and screened. The concrete fragments remain in the sieve frame, and the sediment and concrete debris are screened out and collected by sinking. S4. Classify and screen the concrete fragments: Select sieve meshes with different apertures to screen the concrete fragments to obtain aggregates with different particle sizes. S5. Store the recycled materials in different areas: Store the aggregates, sediment, and concrete debris with different particle sizes separately and mark them, waiting for evaluation and use during subsequent construction. S6. Waste water utilization: The waste water generated by washing the concrete blocks flows into the immersion tank, and then passes through the sedimentation tank to precipitate and filter out the sediment. The upper-layer waste water flows into the water storage tank for further filtration and is reserved for later use.

[0016] Preferably, in step S1, the waste concrete with no recycling value or high recycling cost is treated as waste and not recycled to control the cost. Among the recyclable concrete waste, the unhardened concrete is cleaned and mixed into the new concrete for direct use, or is used alone for casting other concrete products. The hardened concrete blocks are classified by type and property, and the 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 detected and counted, which is convenient for subsequent rapid classification and treatment. The recycling is more standardized, ensuring the recycling quality. At the same time, the container is used to load the immersion tank, sedimentation tank and water storage tank, which can be directly carried on the vehicle, facilitating handling, coping with the harsh environment at the construction site, and facilitating the rapid recycling and utilization of waste concrete at the construction site of the project, shortening the recycling cycle, effectively controlling costs, and being more economical and efficient; 2. The present invention uses a sieve mesh, a sand filtering mesh and a water permeable plate to screen and filter concrete blocks, sediment and powder. Through the flow of water, the sediment and powder are driven to move, and the floating and sinking characteristics of the sediment and powder are utilized for targeted collection. In addition, the flowing water can also clean the concrete blocks and achieve dust reduction. At the same time, the shaking of the water body can realize the self-cleaning of the sand filtering mesh, eliminating the need for frequent replacement of the sand filtering mesh, and reducing the equipment use and maintenance costs; 3. The present invention uses a pH value sensor to detect the acidity and alkalinity of the circulating water body, which is used as a data reference for switching the waste water utilization path, recycling the waste water, saving water resource consumption, and at the same time avoiding the influence of too high acidity and alkalinity on the equipment operation, and timely using the water for other purposes, such as mixing concrete, concrete spraying and curing or flushing engineering equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a working flow chart of a method for recycling waste concrete of a cast-in-place box girder proposed by the present invention; Figure 2 is a three-dimensional structure diagram of a first perspective of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 3 is a three-dimensional sectional structure diagram of a first perspective of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 4 is a three-dimensional structure diagram of a second perspective of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 5 is Figure 4 a partial enlarged structure diagram at A in Figure 6 is a top view structure diagram of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 7 is a right view sectional structure diagram of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 8 is a front view sectional structure diagram of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 9 is a sieve frame structure diagram of a waste concrete recycling device for a cast-in-place box girder proposed by the present invention; Figure 10 Schematic structural diagram of the sand discharging component of a waste concrete recycling device for cast-in-place box girders proposed by the present invention; Figure 11 Schematic structural diagram of the air pump agitation component of a waste concrete recycling device for cast-in-place box girders proposed by the present invention.

[0019] In the figure: 1, container; 11, hanging ladder; 2, immersion tank; 20, sediment pipe; 21, sand discharge pipe; 22, sand filtering pipe; 23, sand discharging auger; 24, sand discharging motor; 3, sieve frame; 30, side frame; 31, hanging ear; 32, grading sieve mesh; 33, bottom sieve mesh; 4, spray pipe; 41, water supply pipe; 5, swing seat; 51, hydraulic cylinder; 52, sliding seat; 6, sedimentation tank; 61, sand filtering mesh; 610, lifting device; 62, pipeline; 621, sealing door; 63, guiding flow baffle; 64, cover; 65, air storage tank; 66, compressor; 7, water pump; 71, drain pipe; 72, water suction pipe; 8, water storage tank; 81, filtering cavity; 82, water seepage plate; 83, water storage cavity; 84, partition board; 85, water suction cavity; 9, sediment tray. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Referring to Figure 1-11 , a waste concrete recycling device and method for cast-in-place box girders, the specific steps of the method include: S1. Statistics and classification: Detect and count the waste concrete that appears at the cast-in-place box girder construction site, and conduct preliminary classification according to the value, strength, pH value, and sediment and stone ratio of the waste concrete; Mark the waste concrete with no recycling value or high recycling cost. The waste concrete with no recycling value or high recycling cost is treated in an environmentally friendly and harmless manner as waste to avoid environmental pollution, and is not recycled to control costs; Separate the recyclable concrete waste by state, type, and nature for subsequent treatment and reuse to obtain recycled aggregates or recycled cementitious materials that meet the requirements; For example, in recyclable concrete waste, after the unhardened concrete is cleaned of dirt, it can be directly used by being mixed into new concrete or used alone for casting other concrete products. However, the concrete diluted by water flushing cannot be directly used. For example, the concrete collected when cleaning a concrete mixing plant or a transport vehicle cannot be directly used because it has been diluted by water flushing and has not hardened yet, and it can be directly put into the sieve frame 3 for cleaning to separate cement, sand, and stones; The hardened concrete blocks are then classified according to type and properties. Concrete blocks of the same type are processed in the same batch to avoid mixing concrete blocks of different qualities, which may affect recycling and reuse; The hardened concrete blocks are generally crushed. If necessary, the recycled aggregates can be further processed, such as grinding and calcining, to improve their physical and mechanical properties or change their chemical properties. However, special equipment is required for grinding and calcining. In order to control costs and shorten the recycling cycle at the construction site, it can be directly crushed and screened for use, which can improve the recycling efficiency and reduce the recycling cost. In addition, hardened cement paste can be separated from the waste concrete of the cast-in-place box girder and can be used to prepare recycled cementitious materials; Recycled aggregates: They can be used as admixtures for new concrete. By incorporating them in a certain proportion, the demand for new raw materials can be reduced. At the same time, recycled aggregates can also be used for road bases and pavement paving, water conservancy projects, coastal protection projects, underground facilities, etc.; Recycled cementitious materials: Prepared from the hardened cement paste separated from waste concrete, they have hydration activity and can be used as foundation modification materials, etc.; Customized concrete products: By using customized molds, the waste concrete of the cast-in-place box girder can be made into concrete bricks, curb stones, post-cast strip covers, scaffold pads and other products.

[0022] S2. Collection and crushing: The waste concrete is disassembled and collected, the steel bars and embedded pipes are cleaned, and classified for use. The disassembled concrete blocks are further crushed by crushing equipment; The crushing equipment uses a crushing bucket or a crushing station. According to the test results of the concrete blocks, the working parameters of the crushing equipment are determined. The lower the strength of the concrete blocks, the smaller the particle size selected for better crushing effect, to avoid the recycled aggregates affecting the quality of the new concrete after pouring due to insufficient strength.

[0023] S3. Cleaning and screening: The crushing bucket grabs the concrete blocks for crushing, and the concrete blocks during the crushing process are washed and dust-removed. The crushed concrete falls into the sieve frame 3 and sinks into the immersion tank 2 for shaking and screening. The concrete fragments are retained in the sieve frame 3, and the sediment and concrete debris are screened out and collected by sinking; The immersion tank 2 is used for storing water, and the screening work of concrete fragments is carried out in the water, realizing cleaning and dust reduction synchronously. The bottom of the immersion tank 2 is recessed to facilitate the gathering of sediment. A sediment pipe 20 is connected to the bottom of the immersion tank 2. One end of the sediment pipe 20 is connected to the bottom of the sedimentation tank 6. The sediment pipe 20 is bent. The lowest point of the bent sediment pipe 20 is connected with a sand discharge pipe 21. The sand discharge pipe 21 is used for discharging sediment. The sediment pipe 20 is used for the waste water to flow between the immersion tank 2 and the sedimentation tank 6, and at the same time deposits and collects the screened sediment; A valve is provided at the outlet of the sand discharge pipe 21 to facilitate the regular discharge of sediment. A sediment tray 9 is provided on the lower side of the sand discharge pipe 21. The sediment tray 9 is used to collect the sediment accumulated in the immersion tank 2 and the sedimentation tank 6. After drying, these sediments can be used as admixtures and directly incorporated into the new concrete, reducing the consumption of aggregates and realizing the recycling of resources at the same time; A cover 64 is provided on the upper side of the sedimentation tank 6. An air pump stirring assembly is provided on the cover 64. The air pump stirring assembly includes an electromagnetic valve, an air storage tank 65 and a compressor 66. The air outlet of the air storage tank 65 is communicated with the inner side of the sedimentation tank 6 through the electromagnetic valve. An exhaust valve is installed on the cover 64. Multiple groups of air storage tanks 65 are provided and release air alternately during operation to improve the stirring effect, promote the water body in the immersion tank 2 and the sedimentation tank 6 to shake, wash the concrete blocks and sediment, and dredge the pipeline; In addition, the valve can be replaced with a sand discharging assembly. The sand discharging assembly includes a sand filtering pipe 22, a sand discharging auger 23 and a sand discharging motor 24. The sand filtering pipe 22 is inclined and the lower end is communicated with the sand discharge pipe 21. The outlet of the sand filtering pipe 22 is arranged at the higher end. The height of the outlet of the sand filtering 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 discharging auger 23 is rotatably arranged in the sand filtering pipe 22. A water filtering gap is provided between the sand filtering pipe 22 and the sand discharging auger 23. The output shaft of the sand discharging motor 24 is fixedly connected with the sand discharging auger 23. The sand discharging motor 24 controls the rotation of the sand discharging auger 23 to convey the sediment upward. At the same time, the waste water flows out along the water filtering gap and accumulates in the lower half of the sand filtering pipe 22 to ensure that the sediment discharged from the outlet of the sand filtering pipe 22 is sediment, thus avoiding water loss during sand discharging and effectively ensuring the utilization efficiency of waste water. The sediment tray 9 is correspondingly arranged under the outlet of the sand filtering pipe 22; The screen frame 3 is erected on the upper part inside the immersion tank 2. A swing seat 5 is provided on the immersion tank 2. The swing seat 5 slides horizontally to shake the screen frame 3 to improve the cleaning and screening effect of the concrete fragments. The screen frame 3 and the swing seat 5 are detachably connected. Hanging ears 31 are arranged on both sides of the screen frame 3. The swing seat 5 includes a hydraulic cylinder 51 and a sliding seat 52. The hydraulic cylinder 51 controls the horizontal sliding of the sliding seat 52. The hanging ears 31 are embedded in the upper mounting groove of the sliding seat 52 to realize the detachable connection.

[0024] S4. Classify and screen the concrete fragments, select sieves with different pore sizes to screen the concrete fragments to obtain aggregates with different particle sizes; Determine the use of different types of sieve frames 3 according to the amount of concrete debris to be processed; In the first embodiment, if a large quantity of the same type of concrete debris needs to be processed, the sieve frame 3 adopts a single-layer screen to simply screen the concrete debris and sediment, and then perform rapid screening through other screening equipment; In the second embodiment, if a small quantity of concrete debris is to be processed, the sieve frame 3 with a multi-layer screen structure is adopted; The sieve frame 3 includes a side frame 30 and a bottom screen 33. The bottom screen 33 is arranged at the bottom of the side frame 30. The bottom screen 33 is a fine screen. According to needs, the side wall of the side frame 30 can be provided with a screen or provided with screen holes to improve the water flow and screening efficiency; At least one set of grading screens 32 is provided above the bottom screen 33 inside the side frame 30. When there is a single grading screen 32, it is generally directly selected as a coarse screen. If there are multiple layers of grading screens 32, they are arranged vertically and stacked. The diameters of the screen holes of the multiple layers of grading screens 32 gradually increase from bottom to top, so as to intercept concrete debris of different particle sizes. Storage cavities are left between multiple sets of grading screens 32 for storing concrete debris of each particle size separated respectively. Both the bottom screen 33 and the grading screens 32 are arranged to be openable and closable, and can be opened and closed through bolts or buckles to facilitate the removal of concrete debris.

[0025] S5. Store the recycled materials in different areas, perform drying or humidification treatment, control the water content, store the aggregate, sediment and concrete debris of different particle sizes separately and mark them, wait for the quality to be evaluated and used during subsequent construction, and be promptly applied to the concrete mixing with different requirements at the construction site without repeated transportation for processing; S6. Utilize the waste water. The crushing bucket works above the soaking tank 2, which is convenient for spraying water for dust removal. At the same time, the waste water generated by flushing the concrete blocks can flow into the soaking tank 2. The concrete debris after being crushed by the crushing bucket falls into the sieve frame 3 for cleaning. The waste water passes through the sedimentation tank 6 for sedimentation. A filter sand screen 61 is provided in the middle of the sedimentation tank 6. The filter sand screen 61 is adapted to the inner wall of the sedimentation tank 6. The filter sand screen 61 filters the sediment. The upper-layer waste water in the sedimentation tank 6 flows into the water storage tank 8 for further filtration and is reserved for standby; A guide flow plate 63 is provided at the bottom of the sedimentation tank 6. The guide flow plate 63 is inclined. The lower end of the guide flow plate 63 is correspondingly arranged with the sand settling pipe 20 to facilitate the sedimented sediment to be introduced into the sand settling pipe 20 for recovery; A lifting device 610 is provided on the filter sand screen 61. The lifting device 610 is used to control the slow or rapid up and down movement of the filter sand screen 61, so as to prompt the water body to quickly pass through the filter sand screen 61 from top to bottom to complete the self-cleaning of the filter sand screen 61; The lifting device 610 includes a reinforcing frame and a telescopic rod. The reinforcing frame is fixedly connected with the filter sand screen 61. One end of the telescopic rod is connected with the inner wall of the sedimentation tank 6, and the other end of the telescopic rod is connected with the reinforcing frame; Inside the water storage tank 8, there are a partition plate 84 and a water seepage plate 82. The partition plate 84 is vertically arranged inside the water storage tank 8. Installation seats corresponding to the water seepage plate 82 are provided in the middle of the partition plate 84 and the water storage tank 8. The water seepage plate 82 is horizontally placed, used to filter fine particulate matter suspended in the wastewater, improve the cleanliness of the wastewater, expand the scope of recycled water utilization, protect the circulating water body pumping equipment, and prevent fine particles from causing wear or blockage of the water pump parts; Inside the water storage tank 8, a filtration chamber 81, a water storage chamber 83, and a water pumping chamber 85 are separated by the partition plate 84 and the water seepage plate 82. The water seepage plate 82 separates the filtration chamber 81 from the water storage chamber 83. The filtration chamber 81 communicates with the upper part of the sedimentation tank 6 through a pipeline 62. A sealing door 621 is provided on the pipeline 62, and the sealing door 621 is opened and closed as needed to control the water level. Wastewater flows from the sedimentation tank 6 into the filtration chamber 81, and the fine particulate matter in the wastewater is filtered by the water seepage plate 82. The water storage chamber 83 communicates with the water pumping chamber 85, used to store the filtered clean water for recycling; A pH sensor is provided inside the water pumping chamber 85, used to detect the acidity and alkalinity of the circulating water body, as a data reference for switching the utilization path of the wastewater. The wastewater for soaking and cleaning concrete blocks is alkaline, so it is necessary to monitor the pH value. After multiple uses, to prevent the acidity and alkalinity from being too high and affecting the equipment operation, the water is timely used for other purposes, such as mixing concrete, concrete spray curing, or flushing engineering equipment; when discharging the circulating water body, a new clean water source is timely introduced to dilute the acidity and alkalinity of the circulating water body; A water pumping pipe 72 is provided inside the water pumping chamber 85. A water pump 7 is provided at the upper end of the water pumping pipe 72. The water outlet of the water pump 7 is connected with a drain pipe 71 and a water supply pipe 41. A spray pipe 4 is provided on the upper side of the immersion tank 2. The water supply pipe 41 communicates with the spray pipe 4. The water pump 7 is used to pump the water body, realizing the flow of the water body inside the immersion tank 2, the sedimentation tank 6, and the water storage tank 8, facilitating the transportation of sediment, and at the same time recycling the water, reducing water resource consumption.

[0026] Specific steps for concrete recycling: Construction workers sort and count the waste concrete to be recycled, use equipment such as impact drills and breaker hammers to break the waste concrete into concrete blocks, and then grab the concrete blocks through a crushing bucket to carry out crushing work above the sieve frame 3. At the same time, the water pump 7 pumps the clear water inside the water pumping chamber 85 and sprays it through the spray pipe 4 to wet and dust the concrete fragments in the crushing bucket; Unset concrete can also be directly put into the sieve frame 3 for cleaning and separation, saving the crushing work, and having better separation effect of cement and sand and higher recycling rate; After the solidified waste concrete is crushed, the formed concrete fragments are poured into the sieve frame 3 for cleaning and screening. The swing seat 5 controls the sieve frame 3 to shake, stirring the concrete fragments. The sediment and concrete debris are screened out through the sieve mesh. The sieve frame 3 intercepts the large - particle concrete fragments. The crane lifts the sieve frame 3 out and takes out the concrete fragments for use as aggregate in concrete mixing, replacing stones; Sediment and debris settle into the sand settling pipe 20. When the water level in the immersion tank 2 rises, part of the wastewater flows into the sedimentation tank 6. The sand filtering net 61 intercepts the sediment, facilitating sediment precipitation and centralized collection and treatment. The sand filtering net 61 can be directly fixed in the sedimentation tank 6. Since the water flows upward from the lower side of the sand filtering net 61, the blockage of the sand filtering net 61 can be reduced, the equipment maintenance cost can be lowered, the replacement frequency of the sand filtering net 61 can be decreased, and its service life can be extended. Or as Figure 11 shown, an air pump stirring assembly is used. The upper part of the sedimentation tank 6 is sealed by the cover 64, and the pipeline 62 is closed by the sealing door. A closed cavity is formed in the upper part of the sedimentation tank 6. The compressor 66 fills the air storage tank 65 with air for compression and energy storage. After the equipment works for a period of time, the solenoid valve is regularly opened, the air flow rushes into the sedimentation tank 6 to squeeze the water body, and then the exhaust valve discharges the air. The water body shakes, cleaning the sand filtering net 61, and at the same time driving the water bodies in the sand settling pipe 20 and the immersion tank 2 to shake, prompting the precipitated sediment to start flowing, facilitating aggregation and treatment, and also serving the function of clearing blockages. In addition, the sand filtering net 61 can be changed to a movable type. The lifting device 610 is used to control the sand filtering net 61 to move up and down slowly or quickly, prompting the water body to quickly pass through the sand filtering net 61 from top to bottom, or impacting to cause the sand filtering net 61 to vibrate, and cooperating with the air pump stirring assembly to complete the self-cleaning of the sand filtering net 61. The water above the sand filtering net 61 flows into the filtering cavity 81 and is filtered by the water seepage plate 82 for the suspended small-particle dust and powder therein. The wastewater is filtered clearly and stored in the water storage cavity 83, facilitating the extraction by the water pump 7 and avoiding damage to the water pump 7 and other pipeline components. The small-particle dust accumulated on the water seepage plate 82 forms lumps on the sedimentation plate. The construction workers regularly go up to clean it with the help of the hanging ladder 11, and collect it centrally for sending to the recycling production workshop to make recycled cementitious materials, saving the grinding work and reducing the recycling cost. Or hooks are arranged on the water seepage plate 82, and the water seepage plate 82 is directly and quickly replaced by a crane, and the sediment is cleaned at other workstations to ensure that the equipment operation is not affected. The water seepage plate 82 is formed by high-pressure molding of environmental protection materials such as cement, sand, slag, and fly ash, or directly cast into a plate with cement. The production cost is low. The hard water seepage plate 82 is convenient to clean. The caked powder can be directly scraped off with a scraper and washed with a high-pressure water gun, which is convenient and fast, and the use and maintenance cost is low. The immersion tank 2, the sedimentation tank 6, and the water storage tank 8 are centrally installed in a container 1, which is convenient for movement and handling.

[0027] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also 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 arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A cast-in-place box girder waste concrete recycling device, including a container (1), characterized in that, Inside the container (1), a dipping tank (2), a sedimentation tank (6) and a water storage tank (8) are provided. The bottom of the dipping tank (2) is concave and used for storing water, where the screening work of concrete fragments is carried out in water, and cleaning and dust reduction are realized simultaneously. A sand settling pipe (20) is connected to the bottom of the dipping tank (2), one end of the sand settling pipe (20) is connected to the bottom of the sedimentation tank (6), the sand settling pipe (20) is bent, and a sand discharge pipe (21) is connected to the lowest point of the bend of the sand settling pipe (20). The sand settling pipe (20) is used for the circulation of waste water between the dipping tank (2) and the sedimentation tank (6), and at the same time deposits and collects the screened sediment. A valve is provided at the outlet of the sand discharge pipe (21), and a sediment tray (9) is provided below the sand discharge pipe (21). The sediment tray (9) is used for storing the sediment accumulated by precipitation in the dipping tank (2) and the sedimentation tank (6). Inside the water storage tank (8), a partition plate (84) and a water seepage plate (82) are provided. The water seepage plate (82) is used for filtering fine particulate matter suspended in the waste water, improving the cleanliness of the waste water, expanding the scope of recycled water utilization, and protecting the pumping equipment of the circulating water body. The partition plate (84) is vertically arranged inside the water storage tank (8), and mounting seats corresponding to the water seepage plate (82) are provided in the middle of the partition plate (84) and the water storage tank (8). Inside the water storage tank (8), a filtration chamber (81), a water storage chamber (83) and a water pumping chamber (85) are separated by the partition plate (84) and the water seepage plate (82). The water seepage plate (82) separates the filtration chamber (81) from the water storage chamber (83). The filtration chamber (81) communicates with the upper part of the sedimentation tank (6). The water storage chamber (83) communicates with the water pumping chamber (85). A water pumping pipe (72) is provided in the water pumping chamber (85). A water pump (7) is provided at the upper end of the water pumping 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 provided above the dipping tank (2). The water supply pipe (41) communicates with the spray pipe (4). The water pump (7) is used for pumping water to realize the flow of water in the dipping tank (2), the sedimentation tank (6) and the water storage tank (8), facilitating the transportation of sediment, and at the same time recycling the water and reducing water resource consumption.

2. The waste concrete recycling equipment for cast-in-situ box girders according to claim 1, wherein, Above the inner side of the upper part of the dipping tank (2), a sieve frame (3) is erected. A swing seat (5) is provided on the dipping tank (2). The swing seat (5) slides horizontally to shake the sieve frame (3) to improve the cleaning and screening effect of concrete fragments. The sieve frame (3) and the swing seat (5) are detachably connected.

3. The recycled equipment for waste concrete of a cast-in-situ box girder according to claim 2, characterized in that, The sieve frame (3) includes a side frame (30) and a bottom sieve mesh (33). The bottom sieve mesh (33) is arranged at the bottom of the side frame (30), and the bottom sieve mesh (33) is a fine sieve mesh. Above the bottom sieve mesh (33) inside the side frame (30), a grading sieve mesh (32) is provided. The grading sieve mesh (32) is a coarse sieve mesh. Both the bottom sieve mesh (33) and the grading sieve mesh (32) are arranged to be openable and closable.

4. The reclaiming equipment for waste concrete of a cast-in-situ box girder according to claim 3, characterized in that, There is at least one group of the grading sieve meshes (32), and the diameters of the sieve holes of multiple groups of the grading sieve meshes (32) gradually increase from bottom to top. There is a storage cavity left between multiple groups of the grading sieves (32) for separately storing concrete fragments of various particle sizes screened out.

5. The waste concrete recycling equipment for cast-in-place box girders according to claim 1, characterized in that, A filter sand net (61) is provided in the middle of the sedimentation tank (6). The filter sand net (61) is adapted to the inner wall of the sedimentation tank (6). A guide flow plate (63) is provided at the bottom of the sedimentation tank (6). The guide flow plate (63) is inclined. The lower end of the guide flow plate (63) is correspondingly arranged with a sand settling pipe (20); A cover (64) is provided on the upper side of the sedimentation tank (6). An air pump stirring assembly is provided on the cover (64). The air pump stirring assembly includes an electromagnetic valve, an air storage tank (65) and a compressor (66). The air outlet of the air storage tank (65) is communicated with the inner side of the sedimentation tank (6) through the electromagnetic valve.

6. The recycled equipment for waste concrete of cast-in-situ box girder according to claim 5, wherein, A lifting device (610) is provided on the filter sand net (61). The lifting device (610) is used to control the slow or fast up and down movement of the filter sand net (61), so that the water body quickly passes through the filter sand net (61) from top to bottom to complete the self-cleaning of the filter sand net (61); The lifting device (610) includes a strengthening frame and a telescopic rod. The strengthening frame is fixedly connected with the filter sand net (61). One end of the telescopic rod is connected with the inner wall of the sedimentation tank (6), and the other end of the telescopic rod is connected with the strengthening frame.

7. A waste concrete recycling device for cast-in-situ box girders according to claim 1, characterized in that, A pH value sensor is provided in the water suction cavity (85) for detecting the acidity and alkalinity of the circulating water body as a data reference for switching the waste water utilization path.

8. A cast-in-situ box girder waste concrete recycling device and method according to claim 1, characterized in that, The valve is replaced with a sand discharging assembly. The sand discharging assembly includes a filter sand pipe (22), a sand discharging auger (23) and a sand discharging motor (24). The filter sand pipe (22) is inclined and the lower end is communicated with the sand discharging pipe (21); The sand discharging auger (23) is rotatably arranged in the filter sand pipe (22). A water filtering gap is provided between the filter sand pipe (22) and the sand discharging auger (23). The output shaft of the sand discharging motor (24) is fixedly connected with the sand discharging auger (23).

9. A method for recycling waste concrete of cast-in-place box girders according to any one of claims 1 to 8, characterized in that, Including steps: S1. Statistics and classification: Detect and count the waste concrete that appears at the cast-in-place box girder construction site, and conduct preliminary classification. Mark the waste concrete with no recycling value or high recycling cost, and separate the recyclable concrete waste according to state, type, and property for subsequent treatment and reuse; S2. Collection and crushing: Disassemble and collect the waste concrete, clean the steel bars and embedded pipes, and use them separately. The disassembled concrete blocks are further crushed by crushing equipment; S3. Cleaning and screening: Wash and remove dust from the concrete blocks during the crushing process. The crushed concrete falls into the sieve frame (3), sinks into the immersion tank (2), and is shaken and screened. The concrete fragments remain in the sieve frame (3), and the sediment and concrete debris are screened out and collected by sinking; S4. Classify and screen the concrete fragments: Select sieves with different pore sizes to screen the concrete fragments to obtain aggregates with different particle sizes; S5. Store the recycled materials in different areas: Store the aggregates, sediment, and concrete debris with different particle sizes separately and mark them, waiting for evaluation and use during subsequent construction; S6. Wastewater utilization: The wastewater generated from flushing concrete blocks flows into the immersion tank (2), and then passes through the sedimentation tank (6) to precipitate and filter out sediment. The upper-layer wastewater flows into the water storage tank (8) for further filtration and is reserved for standby.

10. A method for recycling waste concrete of a cast-in-place box girder according to claim 9, characterized in that, In the step S1, waste concrete with no recycling value or high recycling cost is treated as waste and not recycled to control costs. Among the recyclable concrete waste, the concrete in the uncured state is cleaned and directly mixed into the new concrete for utilization, or is separately used for casting other concrete products. The cured concrete blocks are classified according to their types and properties, and the same type of concrete blocks are processed in the same batch.

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