Intelligent production scheduling method for high-speed railway box girder precast yard

Abstract

The invention discloses an intelligent production scheduling method for a high-speed railway box girder precast yard. The method comprises the steps that a girder erection general plan is compiled; according to the girder erection total plan, an intelligent scheduling method is adopted to obtain a preliminary girder manufacturing monthly plan production scheduling scheme, an optimal scheme is obtained by adjusting the girder erection total plan and the girder manufacturing monthly plan, a girder manufacturing task sand table is set, site constructors can access and know girder manufacturing tasks, and the girder manufacturing task sand table is set. On-site constructors can access and understand the beam manufacturing task; according to the beam manufacturing pre-plan, a prefabricated box beam is constructed in cooperation with a BIM intelligent building method; recommending a girder moving pedestal scheme according to the girder manufacturing monthly plan and the constructed box girder; and beam erecting operation is carried out according to the beam erecting plan, and beam erecting operation is displayed and fed back through a slope graph. According to the method, the corresponding production scheduling scheme is automatically generated, a flexible adjustment mechanism is provided, accurate guidance of a planning system is provided for the site, and the working efficiency and the compiling quality of the site are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent production scheduling of box girders, and relates to an intelligent production scheduling method for a high-speed railway box girder prefabrication yard. Background Art

[0002] The safety of large-scale hoisting equipment has always been a top priority in engineering projects. It is a top priority that cannot be ignored. The wire ropes on large-scale hoisting equipment will inevitably experience fatigue, rust, wear and even sudden breakage during use, resulting in a decrease in carrying capacity. If the use method is unreasonable, there is a lack of safety inspection, no maintenance, or even the use of scrapped wire ropes, it may cause major production safety accidents. At present, the management of wire ropes on large-scale hoisting equipment has always been in an embarrassing situation where it is valued but there is no effective means. Traditional methods such as manual visual inspection and vernier caliper measurement of the wear section are usually used to compare the measured value with the original value of the new rope. The difference is the wear amount of the wire rope section. This traditional method based on experience and feeling has many problems: First, it is inefficient. The traditional inspection method of manual inspection, hand touch, and caliper measurement is time-consuming and inefficient. Moreover, this method is acceptable for measuring the size of new wire ropes, but the data for testing wire ropes in use is extremely inaccurate and cannot meet the requirements for the detection and use of wire ropes. Second, the means are backward. The inherent unreliability of manual inspection makes it difficult to detect major accident hazards. 12% of in-service wire ropes are in an uncontrolled "dangerous or extremely dangerous" state. The third is economic waste. Regular replacement causes great waste. More than 70% of "retired" wire ropes are in the running-in period and still have normal use value.

[0003] During the railway construction process, the box beam prefabrication yard is used to prefabricate the box beams in advance. Many box beams are required, but the construction period is short. Traditional box beam casting is difficult to meet the requirements. When preparing the overall beam erection plan, if the beam making plan is manually arranged, the beam erection work involves multiple processes and links, and the complexity, variability, coordination difficulty, and unreasonable resource allocation make the on-site construction plan preparation cumbersome and time-consuming. In addition, the traditional monthly beam making plan preparation often lacks sufficient preparation basis, resulting in uncertainty and unreliability of the plan. Intelligent scheduling technology automatically generates beam erection tasks and monthly plans by combining the overall beam erection plan to ensure the scientificity and feasibility of the plan; in addition, traditional production scheduling technology requires a lot of manual calculations and adjustments, which is not only time-consuming and labor-intensive, but also prone to errors. Intelligent scheduling technology reduces the cost of human computing and improves work efficiency through automated algorithms. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent production scheduling method for a high-speed railway box girder prefabrication yard. In view of the common problems that beam manufacturing and erection plans are difficult to arrange, and must be adjusted at any time according to actual construction conditions, and the changes are large, the intelligent production scheduling technology and virtual construction technology are applied to provide visual guidance for the beam yard in the process of preparing the plan, thereby ensuring that the construction progress is carried out in an orderly manner.

[0005] The technical solution adopted by the present invention is: an intelligent production scheduling method for a high-speed railway box girder prefabrication yard, the method comprising the following steps:

[0006] 1) Prepare the overall plan for beam erection;

[0007] 2) Based on the overall beam erection plan, the intelligent scheduling method is used to obtain the preliminary monthly beam production plan. The optimal plan is obtained by adjusting the overall beam erection plan and the monthly beam production plan, and a beam production task sandbox is set up so that on-site construction personnel can visit and understand the beam production tasks;

[0008] 3) According to the pre-planning of beam making, the prefabricated box beams are constructed in conjunction with the BIM intelligent construction method;

[0009] 4) Recommend beam shifting platform scheme based on the monthly beam manufacturing plan and the box beam after construction;

[0010] 5) After the box beam is placed on the pedestal, it is subjected to the curing, pre-tensioning and end-sealing processes;

[0011] 6) After completing step 5), perform the beam erection operation according to the beam erection plan, and provide feedback on the beam erection operation through the slope diagram.

[0012] Furthermore, the above-mentioned intelligent scheduling method for a high-speed railway box girder prefabrication yard also includes the construction of a three-dimensional model of the prefabrication yard, and the three-dimensional model includes the structure of the building, the distribution of the pedestals and the prefabricated beam construction site.

[0013] Furthermore, after the overall beam erection plan is prepared in the above step 1), it is subject to approval. During the approval, a preliminary check is performed to see whether the pier number range of the planned bridge piers is consistent with the number of beams to be erected. If the check fails, it is modified. After the modification is completed, the beam erection plan is intuitively displayed through a slope diagram.

[0014] Furthermore, the above-mentioned intelligent scheduling method adopts MES scheduling technology, and the beam erection plan automatically redoes the track laying tasks, production scheduling and frame manufacturing inventory balance, and modifies the beam manufacturing plan or the production task of a certain beam to automatically redo the beam erection plan and frame manufacturing inventory balance.

[0015] Furthermore, the above-mentioned monthly beam-making plan automatically generates preliminary beam-making tasks based on the overall beam-erecting plan, ends with the end time in the beam-erecting plan, provides a list of beam-making, beam-erecting and beam-storage, and can compile a monthly beam-making plan in the list of beam-making, beam-erecting and beam-storage. During the construction process, if fine-tuning is made relative to the plan for the current month, the number of beams to be made for a period of time can be compiled.

[0016] Furthermore, the BIM intelligent construction method includes:

[0017] Build a parametrically driven box girder BIM model component library, a mold BIM model component library, and a steel bar BIM model library that matches the box girder BIM model;

[0018] According to the design drawing parameters of the box girder, the box girder BIM model component of matching shape in the box girder BIM model component library is called to establish the box girder BIM model;

[0019] According to the box girder BIM model, call the mold BIM model components of matching shapes in the mold BIM model component library to establish the mold BIM model;

[0020] According to the box girder BIM model, call the steel bar BIM model with matching shape in the steel bar BIM model library to establish the steel bar BIM model;

[0021] Prepare the box girder mold according to the mold BIM model, and arrange the box girder mold on the box girder automatic production line;

[0022] According to the established box girder BIM model, a matching steel bar BIM model is selected to arrange the box girder steel mesh;

[0023] Arrange the box girder steel mesh in the box girder mold, and pour concrete to form it after the arrangement is completed;

[0024] After the cast box beam solidifies and reaches the set strength, it is demoulded and sent for curing;

[0025] After the curing is completed, the box beam is pre-stretched and grouting is performed to seal the ends;

[0026] After pre-stretching and grouting end sealing are completed, linear monitoring and automated static load tests are carried out during the beam hoisting, transportation and storage stages. The linear changes of the box girder under its own stress and temperature changes are obtained through linear monitoring. The displacement and strain of the box girder under static load are evaluated through automatic static load experiments. Whether the performance of the box girder meets the standards is evaluated through linear changes and displacement and strain under static load.

[0027] Furthermore, the above-mentioned box girder BIM model components are decomposed into components based on the EBS structural decomposition system, and the decomposed components are encoded, forming a unified model standard system for the box girder model at different stages. The model standard system expresses the geometric information and non-geometric information of the model at each stage and maps them between the stages. The data behavior constraint relationship and related logical operation mode between models are established in the model standard system, and the model data structure of the box girder bridge design and construction stage is constructed.

[0028] Furthermore, when modeling the above-mentioned box girder BIM model, the design parameters of the corresponding design drawings are input according to the model style. The design parameters match the corresponding components of the selected box girder. According to the design parameters, the corresponding components are driven to perform three-dimensional modeling and merged into the box girder BIM model. The box girder BIM model and the design drawings are judged for their appearance similarity. If they are consistent, it is qualified. Otherwise, the drive parameterization is redesigned.

[0029] Furthermore, the above-mentioned mold BIM model includes an outer mold BIM model and an inner mold BIM model. According to the box girder BIM model, the sizes of the outer mold BIM model and the inner mold BIM model are obtained through the mold mapping relationship, and the parametric modeling of the outer mold BIM model and the inner mold BIM model is driven according to the size to obtain the final mold BIM model; the steel bar BIM model obtains the size and the number of corresponding directions of the steel bar BIM model through the steel bar mapping relationship according to the box girder BIM model, and the parametric modeling of the steel bar BIM model is driven according to the size and the number of steel bars to obtain the active matching steel bar BIM model; when preparing the box girder mold, the bottom template, two left and right side templates and two end templates are prepared according to the outer template BIM model, and the bottom template, two left and right side templates are prepared according to the bottom template, The corresponding outer mold support and pushing power assembly are designed for the plate and the two end molds. The corresponding inner mold and its driving size-changing power mechanism and the inner mold supports at both ends are prepared according to the inner mold BIM model. It also includes a height adjustment mechanism for the inner mold support. The size of the inner and outer molds can be controlled by controlling the pushing power assembly, the power mechanism driven by the inner mold and the height adjustment mechanism. The arrangement of the box girder steel mesh is based on the steel bar BIM model, and the corresponding number of steel bars in different directions are selected and tied according to the set spacing and position. Before tying, the steel bars that need to be bent need to be bent into the corresponding matching shape and welded or tied into the box girder steel mesh. After completion, it is hoisted and transported to the mold, and the corrugated pipe used for box girder pre-stressing is inserted into the corresponding position of the steel mesh, and then the inner mold is installed.

[0030] Furthermore, in the above step 4), when recommending the beam shifting pedestal for the box girder, two optimal beam shifting pedestals are provided for each box girder based on the pedestal distribution in the beam yard and the pedestal occupancy in production scheduling.

[0031] Beneficial effects of the present invention: Compared with the prior art, the effects of the present invention are as follows:

[0032] (1) Through intelligent production scheduling technology, the site only needs to import the overall beam erection plan, and the monthly beam production plan system will automatically generate the corresponding production scheduling plan through the production scheduling algorithm, and provide a flexible adjustment mechanism. By fine-tuning the overall beam erection plan and the monthly beam production plan, a new scheduling plan can be quickly generated, providing accurate planning system guidance for the site, improving the work efficiency and preparation quality of the site, and reducing the production cost of the site through reasonable resource planning and optimal beam storage recommendation. The intelligent production scheduling system effectively solves the problem of preparing beam erection plans on site through automation and intelligent means, bringing significant economic benefits and management efficiency to construction companies; it can monitor the site situation in real time, including key data such as pedestal occupancy, and promptly remind site management Whether there are enough personnel to store beam pedestals, so as to avoid production delays caused by insufficient resources; the intelligent scheduling system can automatically optimize the allocation of resources such as pedestals according to actual production needs and resource conditions, ensure efficient use of resources and reduce waste; through intelligent scheduling, the system can predict potential production bottlenecks and risks, make adjustments and responses in advance, and enhance the risk management capabilities of the project; the application of intelligent scheduling technology makes project management more refined, the connection between each link is closer, and the level of overall project management is improved; intelligent scheduling technology helps to reduce material waste, improve energy efficiency, and conform to the concept of sustainable development; the application of intelligent scheduling technology promotes the informatization construction of the beam manufacturing industry and lays the foundation for realizing intelligent and automated production;

[0033] (2) The intelligent pedestal recommendation function is an efficient tool for comprehensive analysis of key factors such as site layout, special equipment use and production parameters in the beam manufacturing process. By analyzing the site layout on site, the optimal beam storage position is calculated to ensure that the storage of each beam meets the requirements of the beam erection sequence and construction progress. The intelligent recommendation system takes into account the operating efficiency of special equipment such as beam hoisting machines, and by optimizing the beam storage position, it effectively reduces the travel distance of the beam hoisting machine and reduces the energy consumption and wear of the equipment. By intelligently recommending the optimal beam storage plan, the number of beam toppling caused by improper storage is reduced, the construction efficiency is improved, and the time and cost losses caused by beam toppling are reduced. The intelligent pedestal recommendation system avoids on-site storage chaos and ensures the orderliness of the construction environment through a reasonable beam storage layout, which provides a good solution for the site. Provide guarantee for management and construction safety; the system intelligently recommends pedestal usage plans based on the production parameters of the beam yard, such as the number of pedestals and production capacity, to maximize resource utilization efficiency and avoid resource waste; by reducing equipment movement, reducing the number of beam inversions and preventing on-site chaos, the intelligent pedestal recommendation system helps to reduce construction costs and achieve the goal of reducing costs and increasing efficiency; the intelligent recommendation system can quickly adjust the beam storage plan according to real-time changes in the construction process, and improve the adaptability and flexibility of the construction plan; the data analysis and recommendation plans provided provide strong decision-making support for construction management personnel, helping them make more scientific and reasonable decisions; the standardized recommendation process recommended by the intelligent pedestal helps to promote the standardization of construction processes and improve the management level of the entire construction industry;

[0034] (3) The beam-making task sand table combines on-site collaboration and information sharing, and ensures the smooth progress of the project through efficient communication with construction personnel. Using mobile devices, on-site construction personnel can access the beam-making task sand table in real time anytime and anywhere. This real-time access function enables the construction team to quickly obtain real-time storage information of the prefabricated beam storage pedestal, ensuring that all members are working on the same page and reducing delays and errors in information transmission. Through mobile devices, construction personnel can view detailed production scheduling sand tables and intuitively understand the position of each beam on the storage pedestal. During the construction process, the production scheduling algorithm can be used to recommend the production, racking, and storage data to provide construction guidance for on-site construction, and the process information can be filled in through the process flow of the construction process and sent to the next process manager. This instant communication and information sharing greatly improves construction efficiency and the speed of problem solving, and avoids construction errors and rework caused by information asymmetry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a flow chart of the intelligent production scheduling method for high-speed railway box girder prefabrication yard;

[0036] Figure 2 It is a flow chart of the intelligent construction method of box beam;

[0037] Figure 3This is a schematic diagram of the box girder intelligent construction system;

[0038] Figure 4 This is a schematic diagram of the box girder hoisting linear monitoring structure;

[0039] Figure 5 This is a schematic diagram of the box girder linear monitoring structure;

[0040] Figure 6 This is a schematic diagram of the structure of the box girder static load test device;

[0041] Figure 7 This is a schematic diagram of the gantry walking loading frame structure;

[0042] Figure 8 This is a schematic diagram of the installation structure of the displacement sensor for sinking monitoring;

[0043] Fig. 9 This is a flow chart of the method for controlling the empty sound of the embedded plate of the support;

[0044] Fig.10 This is a schematic diagram of the structure of the crushed stone paving equipment;

[0045] Fig.11 It is a schematic diagram of the front cross-sectional structure of the discharging mechanism;

[0046] Fig.12 It is a schematic diagram of the rear cross-sectional structure of the discharging mechanism;

[0047] Fig.13 This is a schematic diagram of the installation structure of the discharging mechanism from the side;

[0048] Fig.14 It is a schematic diagram of the installation structure of the elastic pressing mechanism;

[0049] Fig.15 This is a schematic diagram of the installation structure of the 3D laser scanner;

[0050] Fig.16 This is a schematic diagram of the camera installation structure;

[0051] Fig.17 It is a schematic diagram of the walking mechanism structure. DETAILED DESCRIPTION

[0052] The invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] Example 1: Reference Figure 1 As shown, a method for intelligent production scheduling of a high-speed railway box girder prefabrication yard comprises the following steps:

[0054] 1) Prepare the overall plan for beam erection;

[0055] 2) Based on the overall beam erection plan, the intelligent scheduling method is used to obtain the preliminary monthly beam production plan. The optimal plan is obtained by adjusting the overall beam erection plan and the monthly beam production plan, and a beam production task sandbox is set up so that on-site construction personnel can visit and understand the beam production tasks;

[0056] During the construction of prefabricated beams, the precise execution of beam-making tasks is the key to ensuring the quality and progress of the project. Through data integration and calculation, we provide a comprehensive beam-making task sandbox for the construction site. The sandbox can show in detail the beam-making process of each pedestal and each beam every day from the beginning of beam-making to the end of beam erection. Using advanced algorithms, our beam-making task sandbox can update the progress of beam-making in real time to ensure that each process can proceed smoothly according to the established plan. The sandbox is presented in an intuitive graphical interface, allowing the construction team to clearly see the working status of each pedestal, including ongoing processes, upcoming tasks, and completed work. In addition, the sandbox also has a prediction function, which can predict possible delays and bottlenecks based on the current beam-making progress and resource allocation, so as to take measures in advance to make adjustments. This not only improves construction efficiency, but also reduces the cost increase caused by improper planning. Through the application of the beam-making task sandbox, managers at the construction site can allocate resources more flexibly, optimize process arrangements, and ensure the efficient completion of beam-making tasks. At the same time, it also provides clear work guidance for the construction team, allowing construction managers to focus more on the work at hand and improve the overall construction quality and safety standards;

[0057] 3) According to the pre-planning of beam making, the prefabricated box beams are constructed in conjunction with the BIM intelligent construction method;

[0058] Virtual construction technology combines BIM modeling and production scheduling technology, and presents the production process and technology of each beam in the beam yard in three dimensions. Through the visual interface, the pedestal position, process time limit, and optimal beam moving plan of each beam in each process can be intuitively tracked. This helps to reduce costs and improve efficiency, provides a scientific decision-making basis for beam production and construction, and reflects the deep empowerment of technology to actual production.

[0059] Intelligent scheduling provides a comprehensive production scheduling solution for beam yard managers by considering historical production conditions, future plans, equipment capabilities, and material quantities, thereby optimizing the beam manufacturing and erection process:

[0060] Production sequence planning: Intelligent scheduling arranges the production sequence of precast beams according to the needs and constraints of the beam yard. This helps avoid bottlenecks and resource waste in the production process and ensures that the production of each beam can be carried out in the most optimized way.

[0061] Time and resource optimization: Intelligent scheduling takes into account key indicators such as the number of beam inversions, the travel distance of the beam lifting machine, the time and fuel consumption. Through intelligent algorithms and optimization technologies, the production process of the beam yard is rationally planned to minimize resource usage and shorten the production cycle, thereby improving overall production efficiency.

[0062] Real-time adjustment and simulation: Smart scheduling not only provides actual production scheduling, but also allows managers to simulate and adjust in real time. By switching dates, managers can view historical, current and simulated future production situations in the BIM model, helping them to adjust production plans in a timely manner under changing circumstances and ensure the controllability of the overall project progress;

[0063] The BIM intelligent construction method combined with the intelligent scheduling system of the three-dimensional model aims to transform complex scheduling data and construction processes into easy-to-understand images through intuitive visualization, thereby providing accurate work guidance for the construction site. The system uses the latest three-dimensional modeling technology to display the construction process of each beam in the form of a three-dimensional model. Users can intuitively see the spatial layout and operation process of each process, including the work platform and beam movement trajectory of the prefabricated beam. Through this three-dimensional visualization method, the construction team can understand the construction plan more clearly and reduce errors caused by misunderstandings. In addition, the system also supports production simulation of the construction process of each beam. Through simulation, the construction team can discover potential problems and risks in advance, adjust the construction plan in time, and optimize resource allocation. This not only improves the safety of construction, but also ensures the quality of the project. Through the interactive function of virtual construction, users are allowed to adjust the construction parameters according to actual conditions, and the system will update the three-dimensional model in real time to ensure the feasibility and accuracy of the construction plan. Through this intelligent virtual construction technology, the management personnel and construction team at the construction site can complete the beam making task more efficiently and safely, providing a strong guarantee for the smooth progress of the entire project;

[0064] 4) Recommend beam shifting platform scheme based on the monthly beam manufacturing plan and the box beam after construction;

[0065] 5) After the box beam is placed on the pedestal, it is subjected to the curing, pre-tensioning and end-sealing processes;

[0066] 6) After completing step 5), perform the beam erection operation according to the beam erection plan, and provide feedback on the beam erection operation through the slope diagram.

[0067] MES scheduling technology is a two-way data linkage calculation from planning to production, and from production to planning. Specifically, it can automatically redo the beam laying task, production scheduling, and frame manufacturing and inventory balance when the beam erection plan is modified, and automatically redo the beam erection plan and frame manufacturing and inventory balance when the beam manufacturing plan or the production task of a certain beam is modified. It improves the efficiency of on-site management.

[0068] Furthermore, the above-mentioned intelligent scheduling method for high-speed railway box girder prefabrication yard also includes the construction of a three-dimensional model of the prefabricated beam yard, and the three-dimensional model includes the structure of the building, the distribution of the pedestals, and the prefabricated beam construction site. By using BIM software such as 3DMAX and Tekla Structures, a detailed three-dimensional model of the prefabricated beam yard was established. 3D modeling covers various aspects such as the structure of the building, the distribution of the pedestals, and the prefabricated beams. Through three-dimensional modeling, the on-site production situation can be intuitively displayed to ensure real-time control of the beam yard production situation. 3D modeling not only helps with accurate expression and optimization in the design phase, but also provides a reliable digital foundation for subsequent construction and operation and maintenance.

[0069] Furthermore, after the overall beam erection plan is prepared in the above step 1), it is subject to approval. During the approval, a preliminary check is performed to see whether the pier number range of the planned bridge piers is consistent with the number of beams to be erected. If the check fails, it is modified. After the modification is completed, the beam erection plan is intuitively displayed through a slope diagram.

[0070] Furthermore, the above-mentioned intelligent scheduling method adopts MES scheduling technology, and the beam erection plan automatically redoes the track laying tasks, production scheduling and frame manufacturing inventory balance, and modifies the beam manufacturing plan or the production task of a certain beam to automatically redo the beam erection plan and frame manufacturing inventory balance.

[0071] Furthermore, the above-mentioned monthly beam-making plan automatically generates preliminary beam-making tasks based on the overall beam-erecting plan, ends with the end time in the beam-erecting plan, provides a list of beam-making, beam-erecting and beam-storage, and can compile a monthly beam-making plan in the list of beam-making, beam-erecting and beam-storage. During the construction process, if fine-tuning is made relative to the plan for the current month, the number of beams to be made for a period of time can be compiled.

[0072] like Figure 2-8 As shown, BIM intelligent construction methods include

[0073] Build a parametrically driven box girder BIM model component library, a mold BIM model component library, and a steel bar BIM model library that matches the box girder BIM model;

[0074] The box girder BIM model components are decomposed into components based on the EBS structural decomposition system, and the decomposed components are coded to form a unified model standard system for the box girder model at different stages. The model standard system expresses the geometric information and non-geometric information of the model at each stage and maps between the stages. The data behavior constraint relationship and related logical operation mode between models are established in the model standard system to construct the model data structure of the box girder bridge design and construction stages;

[0075] According to the design drawing parameters of the box girder, the box girder BIM model component of matching shape in the box girder BIM model component library is called to establish the box girder BIM model;

[0076] When the box girder BIM model is modeled, the design parameters of the corresponding design drawings are input according to the model style. The design parameters match the corresponding components of the selected box girder. The corresponding components are driven according to the design parameters to perform 3D modeling and merge into the box girder BIM model. The box girder BIM model and the design drawings are judged for their appearance similarity. If they are consistent, it means they are qualified. Otherwise, the drive parameterization is redesigned.

[0077] According to the box girder BIM model, call the mold BIM model components of matching shapes in the mold BIM model component library to establish the mold BIM model;

[0078] The mold BIM model includes an outer mold BIM model and an inner mold BIM model. According to the box girder BIM model, the sizes of the outer mold BIM model and the inner mold BIM model are obtained through the mold mapping relationship. The parametric modeling of the outer mold BIM model and the inner mold BIM model is driven according to the size to obtain the final mold BIM model.

[0079] According to the box girder BIM model, call the steel bar BIM model with matching shape in the steel bar BIM model library to establish the steel bar BIM model;

[0080] The steel bar BIM model is based on the box girder BIM model. The size and number of corresponding directions of the steel bar BIM model are obtained through the steel bar mapping relationship. The parametric modeling of the steel bar BIM model is driven according to the size and number of steel bars, and the steel bar BIM model is matched with the activity.

[0081] Prepare the box girder mold according to the mold BIM model, and arrange the box girder mold on the box girder automatic production line;

[0082] When preparing the box girder mold, the bottom mold, the left and right side molds and the two end molds are prepared according to the outer mold BIM model, and the corresponding outer mold support and pushing power assembly are designed according to the bottom mold, the left and right side molds and the two end molds. According to the inner mold BIM model, the corresponding inner mold and its driving power mechanism for changing the size and the inner mold support at both ends are prepared, and the height adjustment mechanism of the inner mold support is also included. By controlling the pushing power assembly, the power mechanism driven by the inner mold and the height adjustment mechanism, the size control of the inner mold and the outer mold is realized;

[0083] According to the established box girder BIM model, a matching steel bar BIM model is selected to arrange the box girder steel mesh;

[0084] The layout of the box girder steel mesh is based on the steel bar BIM model. The corresponding number of steel bars in different directions are selected and tied according to the set spacing and position. Before tying, the steel bars that need to be bent need to be bent into the corresponding matching shape, and then welded or tied into the box girder steel mesh. After completion, it is hoisted and transported to the mold and the corrugated pipe used for pre-stressing the box girder is inserted at the corresponding position of the steel mesh, and then the inner mold is installed;

[0085] Arrange the box girder steel mesh in the box girder mold, and pour concrete to form it after the arrangement is completed;

[0086] After the box girder reinforcement mesh is arranged, the concrete formula and its mixing parameters are stored in the concrete formula library. The concrete formula library is established in advance. The concrete gradation is selected and mixed according to the concrete formula and mixing parameters corresponding to the box girder BIM model. The mixed concrete is promptly sent to the box girder mold for vibration. The frequency of vibration is determined by the external air temperature, concrete temperature and concrete water content.

[0087] After the cast box beam solidifies and reaches the set strength, it is demoulded and sent for curing;

[0088] After the curing is completed, the box beam is pre-stretched and grouting is performed to seal the ends;

[0089] During maintenance, the maintenance time, temperature and humidity control in the maintenance parameter library are called to carry out maintenance.

[0090] A box girder intelligent construction system, comprising:

[0091] The parametric component library module is used to build a parametrically driven box girder BIM model component library, a mold BIM model component library, a steel bar BIM model library matching the box girder BIM model, and a concrete formula and mixing parameter library;

[0092] The box girder BIM model construction module is used to call the box girder BIM model components of matching shapes in the box girder BIM model component library according to the design drawing parameters of the box girder to construct the box girder BIM model;

[0093] A mold BIM model building module is used to call a mold BIM model component of a matching shape in a mold BIM model component library according to a box girder BIM model to establish a mold BIM model;

[0094] The reinforcement BIM model building module is used to call the reinforcement BIM model of matching shape in the reinforcement BIM model library to establish the reinforcement BIM model according to the box girder BIM model;

[0095] The box girder mold preparation module is used to prepare the box girder mold according to the mold BIM model and arrange the box girder mold on the box girder automatic production line;

[0096] The box girder reinforcement mesh layout module is used to select the matching reinforcement BIM model according to the established box girder BIM model to arrange the box girder reinforcement mesh;

[0097] Concrete pouring and molding module, used to arrange the box girder steel mesh in the box girder mold, and pour concrete to form after the arrangement is completed;

[0098] The demoulding and curing module is used to demould the cast box beam after it solidifies to the set strength and send it for curing;

[0099] Box girder pre-stretching and grouting sealing module, used for pre-stretching and grouting the box girder after curing;

[0100] Evaluation module, used to monitor and evaluate whether the prepared box girder performance meets the standards through linear monitoring and static test;

[0101] Linear monitoring includes beam hoisting and transportation monitoring and beam storage stage monitoring. Beam hoisting and transportation monitoring uses a hoisting gantry linear monitoring device, such as Figure 3 As shown, the hoisting gantry linear monitoring device includes a plurality of hoisting infrared distance sensors 102 arranged on the gantry walking crossbeam 101. The plurality of hoisting infrared distance sensors 102 can be directly facing the set point of the box girder 1 to realize the linear monitoring of the box girder during the hoisting and moving process of the box girder. The monitoring of the storage beam stage includes the storage beam linear monitoring device, such as Figure 4 As shown, the storage beam linear shape monitoring device includes an electric walking gantry 201 arranged in the storage beam area. The walking gantry 201 is placed on a walking track 203, and travels along the length direction of the box beam 1 to cover multiple box beams 1. A plurality of groups of storage beam infrared distance sensors 202 are arranged on the walking gantry 201. Each group of storage beam infrared distance sensors 202 faces multiple rows of detection points of a box beam 1. During one walking, point data is taken at intervals, and the box beam deformation curve is received based on the taken point data, thereby realizing the storage beam linear shape monitoring of the box beam. Multiple beams can be monitored at one time, thereby improving the monitoring efficiency.

[0102] Static test monitoring uses static test monitoring devices, such as Figure 5 As shown, the static test monitoring device includes a gantry walking loading frame 301 and a walking displacement crack monitoring device 302. The bottom walking wheels of the gantry walking loading frame 301 are placed between double vertical walking tracks 303, and the frame travels along the length direction of the box beam 1 placed on the supporting pier, covering multiple box beams 1. The double vertical walking tracks 303 are fixedly connected to the ground. A plurality of groups of hydraulic cylinders 304 are arranged at the bottom of the gantry walking loading frame 301, and each group of hydraulic cylinders 304 corresponds to a box beam 1. The walking displacement crack monitoring device 302 includes a lower electric walking frame 305, a plurality of groups of lower displacement sensors 306 and a crack scanner 307. The plurality of groups of lower displacement sensors 306 and the crack scanner 307 are installed on the lower electric walking frame 305. The lower electric walking frame 305 is placed below the multiple box beams 1, and travels along the length direction of the box beams 1.

[0103] Static load test is carried out by loading multiple simply supported box girders at one time, and the displacement deformation and crack conditions of the simply supported box girders under single-point loading are detected. The test efficiency is greatly improved, and the automatic travel and automation level are greatly improved. It can also truly simulate the static load and crack condition detection under single-point loading, and the cracks and displacements are integrated and detected simultaneously, which further improves the test efficiency, simplifies the equipment and reduces the cost.

[0104] In order to allow the walking track to serve the dual role of walking support and loading support, the double vertical walking track 303 includes an upper I-rail 308 and a lower I-rail 309. The upper I-rail 308 and the lower I-rail 309 are vertically arranged side by side at a set interval, and both ends are fixedly connected to the fixing seat 310. The lower I-rail 309 and the fixing seat 310 are fixedly connected to the ground. The walking track has good rigidity, high strength, stable and reliable support, and the upper I-rail meets the set conditions for minimum deformation under maximum loading.

[0105] In order to buffer and protect the gantry traveling loading frame, an elastic buffer limit mechanism 311 is arranged on the top of the fixed seat 310, and a limit rod 312 is arranged at the end of the gantry traveling loading frame. When the limit rod moves to the end, it will abut against the elastic buffer limit mechanism 311, thereby achieving a buffer protection effect.

[0106] In order to achieve stable walking and stable loading support of the walking mechanism, the bottom walking wheel on one side adopts multiple walking wheels to form a wheel group structure. The multiple walking wheels form a wheel group structure, the walking support and loading support area are large, the force surface is larger, and the support and loading stability are better.

[0107] In order to achieve synchronous loading, each group of hydraulic cylinders 304 is connected to a hydraulic pump via a hydraulic synchronization valve, and the hydraulic synchronization valve can ensure that each group of hydraulic cylinders is subjected to balanced force and synchronous loading.

[0108] In order to improve the rigidity and stability of loading, the top of the gantry walking loading frame 301 is set as an arch frame structure. The arch frame structure is lighter and more convenient for installation while meeting the load-bearing requirements.

[0109] In order to achieve more accurate displacement monitoring, a simply supported box girder static test device also includes two sinking monitoring displacement sensors 313 arranged on the two supporting piers of the box girder 1. The sinking monitoring displacement sensors 313 are installed on two double vertical walking tracks 303 through sensor brackets 314. The two sinking monitoring displacement sensors 313 are used to monitor the sinking amount of the supporting piers. The measurement data of the displacement sensors is combined and the average value of the two sinking monitoring displacement sensors is subtracted to make the monitoring more accurate.

[0110] In order to quickly install the displacement sensor and the crack detector, the electric walking frame 305 includes a lower gantry walking frame 315, an inner walking rail 316 and an electric driving mechanism 317. The lower gantry walking frame 315 is placed on two inner walking rails 316 and is equipped with an electric driving mechanism 317 to drive it to move. The electric walking gantry frame is used to facilitate the installation of the displacement sensor and the crack detector, and the movement is stable and reliable.

[0111] The advantages of intelligent construction methods are as follows:

[0112] (1) It can realize BIM forward design from concept to object, form box girder collaborative forward design technology, and construct three-dimensional models of box girder bridges of different external dimensions of high-speed railways through parametric drive, meet the needs of construction according to the model and construction without drawings, and realize the update and unified management of BIM models of railway simply supported bridges, support data collaboration in the two stages of design and construction, promote data flow in each stage, and realize digital-model collaboration, soft-hard combination, and intelligent construction in the construction of high-speed railway box girders, forming an intelligent construction framework system, and improving the intelligent capabilities of high-speed railway box girder bridge construction in soft, hard, cloud, edge and all-party collaboration. The linear changes of the box girder under its own force and temperature changes obtained from linear monitoring are evaluated through automatic static load experiments. The performance of the box girder is evaluated by linear changes and displacement and strain under static loads. The construction quality evaluation of the box girder is realized, and the reliability of the box girder is improved;

[0113] (2) The constructed BIM model component library of various types of box girders, the matching mold BIM model construction library, the steel bar BIM model library, the concrete material and mixing parameter library, and the maintenance parameter library can meet the situation where the design model of railway box girder bridges has many components and complex composition, and thus can quickly establish the railway box girder bridge engineering information model, realize the railway engineering parametric component establishment and management technology, and provide a reusable parametric component library support for the BIM design of railway box girder bridges;

[0114] (3) The BIM model library with unified standard matching is used to call and design the box girder BIM model, which can meet the characteristics of railway box girder bridge design, such as multiple professions, complex processes, multi-source heterogeneous data, inconsistent interfaces, and difficult collaboration. According to the BIM design process of railway box girder bridge, the box girder can be efficiently collaboratively shared based on the railway BIM data during the design and construction stages, forming a general modeling method for railway box girder bridges driven by research data and parameter constraints, forming a BIM forward design method for railway box girder bridges, and achieving efficient collaboration;

[0115] (4) The box girder BIM model formed by BIM technology can realize a shared parameterized three-dimensional model of the railway box girder bridge in the design and construction stages. While meeting the traditional delivery results, the design model needs to be reprocessed or additional information is added according to construction requirements to meet the needs of construction according to the model and construction without drawings. The key technology of railway box girder bridge design and construction collaboration is realized, and the data from the design stage is seamlessly transferred to the construction stage, thereby achieving data collaboration between the design and construction stages.

[0116] (5) Intelligent construction of box girders has been realized, and the simply supported box girders with different spans and different beam height characteristic parameters of the demonstration bridge can be covered, and forward design and construction according to the model can be carried out. The model accuracy and model depth meet the requirements of design, construction, operation and maintenance, and the forward design process of the demonstration bridge model can be realized. The intelligent output of the demonstration bridge outline and the intelligent output of the box girder drawings can be realized;

[0117] (6) The box girder production line can integrate intelligent construction technology, improve the systematic and integrated level of intelligent equipment, intelligent control, intelligent monitoring, and intelligent decision-making, promote intelligent construction technology, and improve intelligent application in steel bar cutting, aggregate forming, and overall lifting technology; prestressed bar bundle threading integration, intelligent tensioning and prestressing control, intelligent grouting and channel fullness control, concrete pouring and distribution, vibration automation control, concrete maintenance and temperature and humidity control, beam hoisting and transportation and beam storage stage linear monitoring, automated static load testing, and transportation equipment control, so as to achieve refined and information-based management of precast beam production progress, quality, safety, and investment; automate and intelligently improve the automated monitoring and detection of typical precast beam production processes, and realize intelligent control of people, machines, materials, methods, and environment; use information linkage feedback to strengthen the solution of on-site pain points and difficulties, promote the "micro-revolution" of on-site technology, and achieve quality and efficiency improvement;

[0118] (7) By using the matching method between box girders, molds and steel bars, and utilizing the automatic layout and lightweight technology of the model, the automated layout of equipment and tooling and the rapid construction of the three-dimensional scene of the beam yard can be realized; the model adds design information and on-site construction information to perform virtual construction of the box girder prefabrication and storage process in the three-dimensional visualization scene, and through the use of video and positioning technology, the real mapping of virtual space and real space physical information can be achieved.

[0119] Furthermore, in the above step 4), when recommending the beam shifting pedestal for the box girder, two optimal beam shifting pedestals are provided for each box girder based on the pedestal distribution in the beam yard and the pedestal occupancy in production scheduling.

[0120] The differences between the old and new technologies in terms of implementation cost, personnel input, process links, implementation cycle and efficiency improvement were compared. The application of intelligent production scheduling technology not only reduced personnel input and process links, but also significantly improved construction efficiency and shortened the construction cycle, thereby reducing overall costs.

[0121] In the traditional planning process, manual planning takes up a lot of manpower and time, and is prone to errors and rework. However, through intelligent scheduling technology, automated scheduling, synchronization of actual production data, optimal platform recommendation and real-time monitoring can be achieved, which greatly reduces manual operations and human errors, and improves the efficiency and fault tolerance of planning. In addition, intelligent scheduling technology makes collaboration and information sharing in the construction process more efficient, reducing delays and problems caused by information asymmetry.

[0122]

[0123] Through the implementation of intelligent production scheduling technology, the overall cost of the project has been effectively controlled, and the construction quality and efficiency have been significantly improved. The application of this new technology not only improves the economic benefits of the project, but also provides valuable experience and reference for subsequent similar projects.

[0124] like Figure 9-17 As shown, the production scheduling method also includes a method for controlling the empty sound of the embedded support plate, which is used for a 40m box girder of a high-speed railway. The method includes the following steps:

[0125] Step 1. Material selection: Epoxy resin uses two-component epoxy resin material;

[0126] According to the needs of on-site construction, epoxy resin materials with excellent ductility, low viscosity, small shrinkage, and low heat release after hardening were purchased in advance. Two-component epoxy resin materials were selected. Its performance indicators are as follows:

[0127] Table 1 Epoxy resin performance indicators

[0128]

[0129]

[0130] Use a 10-20mm sieve for screening to prevent small diameter gravel from mixing in and affecting the grading of concrete aggregate above the embedded plate of the bearing.

[0131] Before construction, the on-site management personnel and formwork team were briefed on the construction technology of the 40m beam integrated support embedded plate air noise control method. The briefing included epoxy resin mixing, gravel screening, drying, epoxy resin painting, epoxy resin painting time, thickness, gravel paving spacing, etc.

[0132] After the 40m beam integrated support embedded plate is pasted with anti-air sound gravel, it should be used after the epoxy resin is dry to ensure that all gravel is firmly pasted. After the gravel is laid, it should be covered to prevent dust from entering and placed in a cool place to prevent exposure to the sun or rain from affecting the bonding force of the epoxy resin and the bonding effect of the gravel. When taking the embedded plate of the support with the gravel pasted, check whether the gravel is firmly pasted. The integrated support embedded plate can be installed only after checking that the gravel is firmly bonded;

[0133] The crushed stones should be bonded evenly, without overlapping or close contact, to ensure a firm bond. After the embedded support plate is installed, Φ16 steel bars should be evenly placed, and the length of the steel bars should be slightly smaller than the width of the support.

[0134] Step 2: Gravel screening: Use the gravel for beam concrete, use a screen to screen out 10-16mm gravel, and use a baking oven to dry the gravel to prevent residual moisture from affecting the bonding ability of the epoxy resin;

[0135] Step 3, gravel pasting: Gravel pasting should be carried out 2 days in advance. Before epoxy resin pasting, prepare gravel, bearing embedded plate, and epoxy resin AB component materials; first, pour the epoxy resin of AB component into a clean mixing bucket in a 1:1 ratio, and use a forced mixer to stir to ensure that the epoxy resin is evenly mixed. After the mixture is evenly mixed, there should be no bubbles or color difference before use, and it must be used within its operable time. Place the bearing embedded plate on a flat site, and evenly apply epoxy resin on the bearing embedded plate with a thickness of 1-3mm. The amount of epoxy resin applied to a single bearing embedded plate should be controlled at 500g to ensure sufficient bonding strength while not being too much, so that the gravel is completely covered with epoxy resin; gravel paving should be carried out within the operable time of epoxy resin. When paving, sprinkle the gravel evenly on the bearing embedded plate to ensure that the gravel does not overlap and the gravel is not tightly attached to the gravel to prevent the gravel from being loosely bonded;

[0136] Step 4: Install the embedded support plate: When installing the embedded support plate, check whether the epoxy resin is completely dry and whether the gravel is firmly bonded. It is strictly forbidden to use the embedded support plate if the epoxy resin is not dry and the gravel is not firmly bonded. After the inspection is qualified, place 3 Φ16 steel bars evenly spaced on the embedded support plate to support the steel cage, ensuring that there is a gap between the steel cage and the gravel to prevent the steel cage from crushing the pasted gravel;

[0137] Step 5: Reserve the chamfered template for the inner cavity at the beam end for later installation: After the steel cage is put into the mold, install the box beam inner mold and the embedded parts of the beam deck normally. After all the processes are completed and the template installation meets the requirements, mark the support cylinder and support rod of the chamfered inner mold at the beam end before pouring the concrete to ensure that the template can be accurately closed after the concrete pouring at the embedded plate of the support is completed, and the size meets the design requirements;

[0138] Step 6. Concrete pouring at the embedded plate of the bearing: When pouring concrete at the embedded plate of the bearing, first use a flashlight to observe whether there is concrete above the embedded plate of the bearing. The pouring thickness should not be too high. When it is controlled at about 200mm, start vibrating with an inserted vibrator. At the same time, start the attached vibrator and the pneumatic trolley vibrator to assist in vibrating the first layer of concrete. The second layer of concrete is poured with a thickness of 300mm, that is, when the concrete overflows the anchor pad, start vibrating. The pouring method is the same as the first layer. Start the attached vibrator and the pneumatic trolley vibrator to assist in vibrating the first layer of concrete. Vibrators and pneumatic trolley vibrators are used to assist in vibration, while inserted vibrators are used as the main vibration method for reinforcing the concrete at the embedded plates of the supports. When vibrating, the steel bars should be vibrated one by one to ensure that the concrete is vibrated densely. At the same time, attention should be paid to the vibration principles of the vibrators. When vibrating with inserted vibrators, the insert vibrators should be inserted quickly and pulled out slowly. The single-point vibration time should not exceed 35 seconds. The single vibration time of attached vibrators and pneumatic trolley vibrators should not exceed 25 seconds. After the second layer of concrete is poured, the formwork should be installed and the steel bar protection layer should be checked to see if it meets the design requirements.

[0139] Furthermore, the above-mentioned attached vibrator and pneumatic trolley vibrator should be no less than 50 mm away from the strip foundation of the beam-making pedestal, while the attached vibrator is close to the support and the pneumatic trolley vibrator is far away from the support.

[0140] Furthermore, the above-mentioned pasted gravel must be washed with water after screening to ensure that all stones are clean. The washed stones are dried in a dryer. The temperature during drying should not be too high, and the controlled temperature should not exceed 300°.

[0141] Furthermore, when laying the gravel, the surface of the gravel should not be covered by epoxy resin except for the part in contact with the bearing embedded plate.

[0142] Among them, when laying the above-mentioned gravel, gravel laying equipment is used for laying, such as Figure 2-9 As shown, the gravel paving equipment includes a gravel placing mechanism 1, a gravel pressing mechanism 2 and a support embedded plate placing platform 3, the gravel placing mechanism 1 and the gravel pressing mechanism 2 are both installed on a walking mechanism 4, the support embedded plate placing platform 3 is provided with a placing groove 5, the placing groove 5 is used to place the support embedded plate 6, the walking mechanism 4 is installed on one side of the support embedded plate placing platform 3 and the gravel placing mechanism 2 can place the gravel on the support embedded plate 6, the gravel pressing mechanism 2 can squeeze the placed gravel downward, the gravel paving equipment composed of the gravel placing mechanism, the gravel pressing mechanism and the support embedded plate placing platform can realize accurate paving of gravel, improve the quality of gravel paving, reduce the labor intensity, time and labor consuming problems caused by manual paving, and the paving and pressing are performed automatically with high efficiency.

[0143] In order to improve the speed and accuracy of gravel placement, the gravel placement mechanism 1 includes a first column 101, a linear motion module 102, a double-rod lifting cylinder 103, a storage hopper 104, a discharging mechanism 105 and a discharging nozzle 106. The lower end of the first column 101 is installed on the walking mechanism 4, one end of the linear motion module 102 is horizontally and vertically fixedly connected to the first column 101, the cylinder seat of the double-rod lifting cylinder 103 is fixedly connected to the slider 107 arranged on the front side of the linear motion module 102, the storage hopper 104 is installed on the cylinder seat of the double-rod lifting cylinder 103, and the discharging nozzle 106 is installed on the cylinder seat of the double-rod lifting cylinder 103. The material mechanism 105 is installed at the discharge port of the storage hopper 104 and is used to deliver the crushed stones one by one. The discharge nozzle 106 is vertically installed at the ends of the two cylinder rods of the double-rod lifting cylinder 103, and is connected to the discharge port of the storage hopper 104 through a hose 108. The use of columns, linear moving modules and lifting cylinders can achieve precise positioning of the discharge nozzle, and the gravel is laid accurately and evenly without overlapping or contact problems. The storage hopper is used to directly store the gravel and the discharge mechanism is used for discharging, which greatly improves the discharging efficiency, and the material is discharged by particle, and the feeding is accurate.

[0144] In order to simplify the discharging mechanism, the discharging mechanism 105 includes a discharging rotating disk 109, a swing rod 110, a return spring 111 and a connecting rope 112. The discharging rotating disk 109 is rotatably connected to the discharging port through a rotating shaft 113 and can block the discharging port. A feeding U-shaped groove 114 is provided on the discharging rotating disk 109. The feeding U-shaped groove 114 accommodates a gravel. The outer end of the rotating shaft 113 is fixedly connected to the swing plate 110. The upper side of the free end of the swing rod 110 is connected to the outer surface of the storage hopper 104 through a return spring 111. The lower side of the free end of the swing rod 110 is connected to the double rod 112 through a connecting rope The fixed rod 115 is vertically fixedly connected at the end of the cylinder rod of the lifting cylinder 103. When the cylinder rod is extended to the longest, the feeding U-shaped groove 114 can be rotated 150 degrees and a gravel can be sent from the inside of the storage hopper 104 to the hose 108. The three-dimensional laser scanner is used to identify the image of the gravel placement area for modeling and the threaded steel bars embedded in the support embedded plate. According to the established model of the position to be laid and the requirements for the gravel laying spacing, the linear module, the double-rod telescopic cylinder and the walking mechanism are controlled to carry out fast and accurate laying, thereby avoiding large errors caused by inaccurate positioning or manual alignment.

[0145] In order to automatically carry out modeling, a model basis is not provided for paving. The above-mentioned gravel paving equipment also includes a three-dimensional laser scanner 7. The three-dimensional laser scanner 7 is used to identify the image of the gravel placement area for modeling and the modeling of the threaded steel bars embedded in the support embedded plate. The three-dimensional laser scanner 7 is installed on the scanner bracket 8, and the scanner bracket 8 is installed on the walking mechanism 4. The scanner bracket 8 is located in front of the gravel placement mechanism 1. The three-dimensional laser scanner is used to identify the image of the gravel placement area for modeling and the modeling of the threaded steel bars embedded in the support embedded plate. According to the established model of the position to be laid and the gravel paving spacing requirements, the linear module, the double-rod telescopic cylinder and the walking mechanism are controlled to carry out fast and accurate paving, thereby avoiding large errors caused by inaccurate positioning or manual alignment.

[0146] In order to evaluate the quality of gravel paving, the above-mentioned gravel paving equipment also includes a camera 9, which is used to identify the quality inspection after the gravel is placed. The camera 9 is installed on the walking mechanism 4 through the camera bracket 10 and is located behind the gravel pressing mechanism 2. The camera is used to perform quality inspection on the laid gravel, such as the detection of gaps, overlaps and contacts of gravel. If gaps are judged, gravel is filled in. If gravel overlaps and contacts occur, manual correction is performed to ensure the quality of gravel paving.

[0147] In order to achieve fast and accurate position movement, the above-mentioned walking mechanism 4 includes a walking platform 401, a slider guide pair 402 and a ball screw nut pair 403. The walking platform 401 is connected to the ground through two slider guide pairs 402. The nut of the ball screw nut pair 403 is fixedly connected to the nut seat 404 at the bottom of the walking platform 401. Both ends of the screw of the ball screw nut pair 403 are connected to the ground through a bearing seat 407 and one end is extended and connected to a drive motor 405. The drive motor 405 is installed on the ground through a motor frame 406. The slider guide pair and the ball screw nut pair are used for directional walking support and drive, so that the walking is smooth, the position is accurate, and the movement is fast.

[0148] In order to realize rapid pressing of crushed stones, the crushed stone pressing mechanism 2 includes a pressing plate 201 and a pressing double-rod cylinder 202. The pressing plate 201 is provided with corresponding through holes avoiding the screws and steel bars on the embedded plate of the support. The cylinder rod end of the pressing double-rod cylinder 202 is fixedly connected to the upper end surface of the pressing plate 201. The cylinder seat of the pressing double-rod cylinder 202 is vertically fixedly connected to the cantilever frame 203. The cantilever frame 203 is installed on the walking mechanism 4. The bottom of the pressing plate 201 is provided with a high-density sponge layer 204, and the bottom of the high-density sponge layer 204 is provided with a receiving hole 20 5. An elastic pressing mechanism 206 is vertically installed in the accommodating hole 205. The elastic pressing mechanism 206 includes a pressing plate 207 and a spring 208. The pressing plate 207 is connected to the bottom surface of the pressing plate 201 through the spring 208. When in use, the cylinder rod of the double-rod cylinder is controlled to extend, and the pressing plate presses the gravel. Then, under the elastic action of the elastic pressing mechanism, the gravel of different heights can be effectively pressed into place, avoiding poor stability caused by inadequate pressing. The use of a high-density sponge layer can effectively play a role in pressing stability.

[0149] The method for controlling the hollow noise of the embedded plate of the integrated support of the 40m box girder of the high-speed railway ensures that there is enough aggregate after the epoxy resin and crushed stone are laid above the embedded plate of the support. The pneumatic trolley vibrator and the attached vibrator are used to strengthen the vibration. The web template at the end of the beam is installed later to provide the inserted vibrator with construction operation space, so as to realize the precise positioning and vibration. The method can effectively control the hollow noise problem of the embedded plate of the integrated support of the prefabricated box girder, ensure the quality of the concrete pouring at the end of the beam, and improve the quality of the prefabricated box girder entity. The specific effects are reflected in the following aspects:

[0150] 1) Through a variety of auxiliary measures, the generation of bubbles and pitting on the beam end face, the bottom plate of the support, and the web can be effectively controlled to prevent the beam end face from being vibrated loosely due to the influence of the anchor hole and anchor basin, and the generation of bubbles and pitting on the bottom plate and web of the support due to the inadequate vibration of the inserted vibrator, thus ensuring the quality of concrete pouring in this area;

[0151] 2) It can effectively ensure the quality of concrete above the embedded plate of the bearing, control the amount of concrete aggregate above the embedded plate of the bearing, and prevent the phenomenon of insufficient aggregate caused by too dense bearing steel bars;

[0152] 3) By adding a pneumatic trolley vibrator to work in conjunction with the original attached vibrator, the probability of empty sound is reduced;

[0153] 4) Use 3 Φ16 steel bars to prevent some of the gravel from being crushed and ensure the quantity and quality of the gravel above the embedded plate of the bearing;

[0154] 5) The web formwork at the end of the beam is installed later to provide operation and visual space for concrete vibration at the support, and the concrete above the embedded plate of the support is accurately vibrated and the vibration condition is observed;

[0155] (2) The gravel paving equipment, which is composed of a gravel placing mechanism, a gravel pressing mechanism and a support embedded plate placing platform, can achieve accurate gravel paving, improve the quality of gravel paving, reduce the labor intensity, time and labor caused by manual paving, and automatically walk to pave and press, which is highly efficient;

[0156] (3) The use of columns, linear moving modules and lifting cylinders can achieve accurate positioning of the discharge nozzle, and the gravel is laid accurately and evenly without overlapping or contacting. The storage hopper is used to directly store the gravel and the discharge mechanism is used to discharge the gravel, which greatly improves the discharge efficiency. The discharge is carried out by grain, and the feeding is accurate.

[0157] (4) A discharging mechanism linked to the telescopic movement of the double-rod cylinder is adopted. When the double-rod cylinder is extended, the discharging rotating disk is pulled to rotate for automatic mechanical feeding. The equipment is greatly simplified. After the feeding is completed and the next crushed stone is fed back, the reset spring resets the discharging rotating disk. The double-rod cylinder serves to send the discharging nozzle to the laying position to put the crushed stone down at a low position and serves as the power of the discharging mechanism, playing a dual role. The structure is greatly simplified and the cost is greatly reduced. The U-shaped groove material collection method has a simple structure and the material collection quantity is easy to control when the particle difference is not large. The 150-degree rotation and swing angle can meet the requirements of material collection and unloading.

[0158] (5) The 3D laser scanner is used to identify the image of the gravel placement area for modeling and the modeling of the threaded steel bars embedded in the support embedded plate. According to the established model of the location to be laid and the gravel laying spacing requirements, the linear module, double-rod telescopic cylinder and walking mechanism are controlled to achieve fast and accurate laying, avoiding large errors caused by inaccurate positioning or manual alignment;

[0159] (6) Use cameras to inspect the quality of the laid gravel, such as detecting gaps, overlaps, and contacts between gravel. If gaps are detected, fill them with gravel. If overlaps or contacts between gravel are detected, correct them manually to ensure the quality of the laid gravel.

[0160] (7) The slider guide pair and ball screw nut pair are used for directional walking support and drive, which ensures smooth walking, precise positioning and fast movement.

[0161] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An intelligent production scheduling method for a high-speed railway box girder prefabrication yard, characterized by: The method comprises the following steps: 1) Prepare the overall plan for erecting the bridge; 2) According to the overall beam erection plan, the intelligent scheduling method is used to obtain the preliminary monthly beam production plan. The optimal plan is obtained by adjusting the overall beam erection plan and the monthly beam production plan. A beam production task sand table is set up so that on-site construction personnel can visit and understand the beam production tasks. 3) Construct prefabricated box beams according to the pre-planning of beam making and in conjunction with the BIM intelligent construction method; 4) Recommend beam shifting platform scheme based on the monthly beam manufacturing plan and the box beam after construction; 5) After the box beam is placed on the pedestal, it is subjected to the curing, pre-tensioning and end-sealing processes; 6) After completing step 5), perform the beam erection operation according to the beam erection plan, and provide feedback on the beam erection operation through the slope diagram.

2. According to claim 1, a method for intelligent production scheduling of a high-speed railway box girder prefabrication yard is characterized by: It also includes the construction of a three-dimensional model of the precast beam yard, which includes the structure of the building, the distribution of pedestals and the precast beam construction site.

3. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 2 is characterized by: After the overall beam erection plan is prepared in step 1), it is reviewed and approved. During the review, a preliminary check is performed to see if the pier number range of the planned bridge piers is consistent with the number of beams to be erected. If the check fails, it is modified. After the modification is completed, the beam erection plan is intuitively displayed through the slope diagram.

4. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 3 is characterized by: The intelligent scheduling method adopts MES scheduling technology. The beam erection plan automatically redoes the laying tasks, production scheduling and inventory balance of beam manufacturing. Modifying the beam manufacturing plan or the production task of a certain beam will automatically redo the beam erection plan and inventory balance.

5. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 4 is characterized by: The monthly beam-making plan automatically generates preliminary beam-making tasks based on the overall beam-erecting plan, and ends with the end time in the beam-erecting plan. It provides a list of beam-making, beam-erecting and beam-storage, and can compile a monthly beam-making plan in the list of beam-making, beam-erecting and beam-storage. During the construction process, if fine-tuning is made relative to the plan for the current month, the number of beams to be made for a period of time can be compiled.

6. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 4 is characterized by: BIM intelligent construction methods include Build a parametrically driven box girder BIM model component library, a mold BIM model component library, and a steel bar BIM model library that matches the box girder BIM model; According to the design drawing parameters of the box girder, the box girder BIM model component of matching shape in the box girder BIM model component library is called to establish the box girder BIM model; According to the box girder BIM model, call the mold BIM model components of matching shapes in the mold BIM model component library to establish the mold BIM model; According to the box girder BIM model, call the steel bar BIM model with matching shape in the steel bar BIM model library to establish the steel bar BIM model; Prepare the box girder mold according to the mold BIM model, and arrange the box girder mold on the box girder automatic production line; According to the established box girder BIM model, a matching steel bar BIM model is selected to arrange the box girder steel mesh; Arrange the box girder steel mesh in the box girder mold, and pour concrete to form it after the arrangement is completed; After the cast box beam solidifies and reaches the set strength, it is demoulded and sent for curing; After the curing is completed, the box beam is pre-stretched and grouting is performed to seal the ends; After pre-stretching and grouting end sealing are completed, linear monitoring and automated static load tests are carried out during the beam hoisting, transportation and storage stages. The linear changes of the box girder under its own stress and temperature changes are obtained through linear monitoring. The displacement and strain of the box girder under static load are evaluated through automatic static load experiments. Whether the performance of the box girder meets the standards is evaluated through linear changes and displacement and strain under static load.

7. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 6 is characterized by: The box girder BIM model components are decomposed into components based on the EBS structural decomposition system, and the decomposed components are encoded. A unified model standard system is formed for the box girder model at different stages. The model standard system expresses the geometric information and non-geometric information of the model at each stage and maps them between the stages. The data behavior constraint relationship and related logical operation mode between models are established in the model standard system to construct the model data structure of the box girder bridge design and construction stages.

8. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 6 is characterized by: When modeling the box girder BIM model, the design parameters of the corresponding design drawings are input according to the model style. The design parameters match the corresponding components of the selected box girder. The corresponding components are driven by the design parameters to perform three-dimensional modeling and merge into the box girder BIM model. The box girder BIM model and the design drawings are judged for their appearance similarity. If they are consistent, it is qualified. Otherwise, the drive parameterization is redesigned.

9. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 6 is characterized by: The mold BIM model includes an outer mold BIM model and an inner mold BIM model. According to the box girder BIM model, the sizes of the outer mold BIM model and the inner mold BIM model are obtained through the mold mapping relationship. The parametric modeling of the outer mold BIM model and the inner mold BIM model is driven according to the size to obtain the final mold BIM model; the steel bar BIM model obtains the size and the number of corresponding directions of the steel bar BIM model through the steel bar mapping relationship according to the box girder BIM model, and the parametric modeling of the steel bar BIM model is driven according to the size and the number of steel bars to obtain the active matching steel bar BIM model; when preparing the box girder mold, the bottom template, two left and right side templates and two end templates are prepared according to the outer mold BIM model, and the bottom template, two left and right side templates and The two end formworks are designed with corresponding outer formwork supports and pushing power assemblies. The corresponding inner formwork and its driving size-changing power mechanism and the inner formwork supports at both ends are prepared according to the inner formwork BIM model. The height adjustment mechanism of the inner formwork support is also included. The size of the inner and outer formworks can be controlled by controlling the pushing power assembly, the power mechanism driven by the inner formwork and the height adjustment mechanism. The box girder steel mesh is arranged by selecting the corresponding number of steel bars in different directions according to the steel bar BIM model and binding them according to the set spacing and position. Before binding, the steel bars that need to be bent need to be bent into the corresponding matching shapes and welded or tied into the box girder steel mesh. After completion, it is hoisted and transported to the mold, and the corrugated pipe used for box girder pre-stressing is inserted into the corresponding position of the steel mesh, and then the inner formwork is installed.

10. The intelligent production scheduling method for high-speed railway box girder prefabrication yard according to claim 1 is characterized by: Step 4) When recommending beam shifting pedestals for box girders, two optimal beam shifting pedestals are provided for each box girder based on the pedestal distribution in the beam yard and the pedestal occupancy in production scheduling.

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