A method for sectional installation of a steel beam road bridge combining temporary support and cantilever assembly

Abstract

The application discloses a kind of temporary buttress and the method for combining steel beam road bridge segmented installation of suspension, it is related to road bridge construction technical field, specific steps include digital modeling and simulation, automatic positioning and suspension, real-time data feedback, automatic operation and adjustment, manual operation and adjustment, real-time guidance and feedback, judgment and construction temporary buttress, joint processing, closure processing.The application adopts the above-mentioned steps of a kind of temporary buttress and the method for combining steel beam road bridge segmented installation of suspension, the splicing of temporary buttress auxiliary steel beam prefabricated part is under the automatic control of control center, improves bridge body suspension precision and breaks through manpower limit, improves suspension efficiency and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road and bridge construction, in particular to a method for sectional installation of steel beam combining temporary support pier and cantilever assembly. BACKGROUND

[0002] Concrete bridges have long dominated in China, while steel structure bridges account for 85%, 41% and 35% in France, Japan and the United States respectively. The proportion of highway steel structure bridges in China is less than 1% as of the end of 2015. Steel structure is light in weight, uniform in material, especially suitable for factory manufacturing and assembly construction. Therefore, it has become a consensus in the industry to promote the construction of steel structure bridges. In the construction process of steel bridge, cantilever assembly method is a common choice, especially for bridges under roads and bridges, bridges near water, deep gullies and deep valleys. The cantilever assembly method refers to the construction method of balancing the precast bridge body piece by piece to the midspan of the cantilever assembly bridge body by setting a hanging bracket on both sides of the pier, and applying pre-stress piece by piece. Cantilever assembly construction includes block precast, transportation, assembly and closure. Cantilever assembly bridge can greatly shorten the construction period, and compress the manufacturing period of bridge body precast piece and the assembly period of bridge body together. Moreover, the bridge body precast piece is manufactured in a safe environment, which provides higher guarantee for the safety performance of the bridge body.

[0003] In the process of building steel beam bridge body by cantilever assembly method, temporary support piers are often built to support the steel beam bridge body for the need of stress balance and the dead load of the bridge body. The temporary support piers are removed after the bridge body is built. The control points in the construction process of cantilever assembly include the stability of steel beam, the stress and local stability of each member, the deflection of the beam during cantilever assembly, which should be within the control range, the vibration of the beam body during cantilever assembly, closure control, etc. Although various safety specifications and construction specifications are established in the existing technology to limit the construction, there are still limitations of manpower and deficiencies in the face of unexpected situations. Moreover, the precision control during the construction and closure of the bridge body needs to be further improved. SUMMARY

[0004] The purpose of the present application is to provide a method for sectional installation of steel beam road and bridge combining temporary support pier and cantilever assembly, which can improve the precision of bridge body cantilever assembly and break through the limitation of manpower under the automatic control of the control center, and improve the efficiency and safety of cantilever assembly.

[0005] To achieve the above purpose, the present application provides a method for sectional installation of steel beam road and bridge combining temporary support pier and cantilever assembly, the steps are as follows:

[0006] S1 Digital Modeling and Simulation: Before construction, a 3D model is created using digital modeling software based on the terrain conditions and bridge design requirements, including temporary supports, piers, precast steel beams, and construction parameters and pre-planned cantilever assembly sequence are set.

[0007] S2 Automated Positioning and Suspension: On-site, an automated system is used to assist in suspending steel beam segments. The automated system includes several high-precision positioning sensors, cameras, laser rangefinders, and automated lifting equipment. The positioning sensors are installed on temporary supports and installed segments. The automated lifting equipment has programmable control capabilities and performs automatic positioning and suspension based on 3D models and data from the positioning sensors.

[0008] S3 Real-time Data Feedback: The position, angle and alignment of the steel beam segments are monitored by positioning sensors and cameras installed on the steel beam segments, and the corresponding data is transmitted to the control center. The control center integrates sensor data, 3D model information, construction parameters and temporary support construction plans. The control center is set up as a command center on the construction site in the form of a remote control console.

[0009] S4 Automated Operation and Adjustment: The automated lifting equipment suspends the steel beam to be installed in segments according to the predetermined instructions. The control center monitors the actual position and angle of the segments in real time based on sensor data. During the monitoring process, the accuracy is preset. If the accuracy does not meet the requirements, the operator is prompted to intervene manually.

[0010] S5 manual operation and adjustment: The operator uses the console or control panel to fine-tune the section to be installed based on the real-time monitoring data provided by the control center until the section reaches the accurate installation position.

[0011] S6 Real-time Guidance and Feedback: The control center's display screen will show the segment's predetermined position, angle, and actual alignment, providing real-time guidance to the operator. When the segment reaches accurate alignment, it will issue an audio or visual prompt.

[0012] S7 Judgment and Construction of Temporary Supports: The control center sets an algorithm to calculate the required support force for the segmented steel beams. When it is determined that the support is insufficient, the control center initiates a temporary support construction plan. The forms of temporary supports include autonomous temporary supports, steel structure supports, sand cylinder supports, and wooden suspension supports.

[0013] S8 Joint Treatment: During the assembly process, the joints of the precast steel beam bridge components are treated. The treatment methods include welding connection, bolt connection, locking connection, precision mechanical connection, ring plate connection, adhesive connection, and laser precision welding.

[0014] S9 closure treatment: after the completion of the cantilever, check the state of each part of the steel beam bridge body, measure the position and deviation of the steel beam bridge body by laser positioning, collect the deformation, displacement and load data of the steel beam prefabricated part by the positioning sensor, simulate the closure process in the control center and make a plan for the sudden situation of closure, then control the bridge body shape under the guidance of the control center using hydraulic jacks, cranes and steel wire ropes to complete the closure.

[0015] Preferably, the construction parameters include cantilevering sequence parameters, automatic adjustment force parameters, and automatic log recording parameters, and also include:

[0016] Positioning accuracy parameters, the positioning accuracy parameters are the accuracy threshold of the positioning sensor;

[0017] Angle alignment parameters, the angle alignment parameters are the allowable value of the angle error;

[0018] Temporary pier construction parameters, the temporary pier construction parameters are the standard, height and position of the temporary pier;

[0019] Monitoring frequency parameters, the monitoring frequency parameters are the real-time monitoring frequency of the positioning sensor and the camera, considering the delay caused by data transmission;

[0020] Abnormal processing parameters, the abnormal processing parameters are the alarm threshold of the set abnormal situation, and the alarm mode and emergency stop operation under the corresponding abnormal situation;

[0021] Real-time feedback interface parameters, the real-time feedback interface parameters are the layout and data presentation method of the control center display interface;

[0022] Automatic alignment algorithm parameters, the automatic alignment algorithm parameters are the alignment algorithm data requirements input into the control center during the alignment process of the steel beam prefabricated part.

[0023] Therefore, the steel beam bridge sectional installation method combining temporary piers and cantilevering according to the above steps has the following beneficial effects:

[0024] (1) Improved accuracy: the automatic system can use high-precision sensors and positioning technology to ensure higher accuracy during the suspension and connection of steel beam sections, which can reduce human error and improve alignment accuracy.

[0025] (2) Automatic alignment: the automatic system can use control algorithms and precise actuators to automatically align steel beam sections, which can save time for manual adjustment and reduce adjustment errors.

[0026] (3) Optimize process planning: the cantilevering process can be optimized according to the 3D model, sectional size and environmental conditions to calculate the best suspension sequence and angle to reduce unnecessary movement and adjustment.

[0027] (4) Reducing manual labor: The need for manual operation can be reduced, especially during positioning and alignment, not only improving efficiency, but also reducing physical exertion and safety risks for personnel.

[0028] (5) Reducing human error: By reducing human intervention, problems caused by human error are reduced, thereby improving the quality and stability of the steel beam cantilever assembly.

[0029] (6) Reducing time: Optimizing the cantilever assembly process reduces the time for manual adjustment and waiting, thereby shortening the total construction period of the steel beam cantilever assembly.

[0030] The technical solutions of the present application will be further described in detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A schematic diagram of the steps of the method for the temporary pier combined with the cantilever assembly of the steel beam road bridge sectional installation of the present application;

[0032] Figure 2 A schematic diagram of the logical relationship between the automatic system and the control center of the embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be further described in detail below with the aid of the accompanying drawings and examples.

[0034] EMBODIMENT

[0035] The cable-stayed bridge of the steel beam sectional assembly includes a main tower, a stay cable and a bridge deck beam. It is assumed that the cable-stayed bridge is composed of one main tower, two side spans and one main span. The main tower is 100 m high, the main span is 200 m long, the side span is 50 m long, the number of stay cables is 4 groups, the number of stay cables in each group is 8, and the type of bridge deck beam is steel box beam. The cantilever assembly steps are as shown in Figure 1 , and the logical connection relationship between the automatic system and the control center is as shown in Figure 2 .

[0036] I. Preparation stage:

[0037] Create a detailed 3D model. The software that can be selected includes:

[0038] SAP2000: suitable for static and dynamic analysis, including modeling, analysis and design of cable-stayed bridges.

[0039] Midas Civil: used for modeling, analysis and construction simulation of long-span bridges.

[0040] LUSAS: can be used for static and dynamic analysis, suitable for various bridge structure analysis and design.

[0041] According to the requirements of the cable-stayed bridge structure, determine the parameters of each part, including the main tower, stay cables, deck beams, and connection details. Specifically, it includes:

[0042] Span: The main span length of the cable-stayed bridge determines the size and structural design of the bridge.

[0043] Load requirements: Determine the design load based on the purpose and geographical conditions of the bridge, including vehicle load, pedestrian load, etc.

[0044] Stay cable parameters: One of the main characteristics of the cable-stayed bridge, including cable angle, cable length, cable tension, etc.

[0045] Main beam parameters: Size, cross-sectional shape, etc.

[0046] Support parameters: Bridge support design, including fixed support, sliding support, etc.

[0047] Steel parameters: Steel specifications, strength, etc. used to manufacture bridge components.

[0048] Distributed sensor networks and wireless communication technology are used between the control center and the controlled parts to achieve simultaneous assembly of different parts, ensuring consistency and precision through real-time communication and data sharing.

[0049] Pre-plan the installation sequence of the main tower, stay cables, and deck beams to ensure stability and continuity of installation.

[0050] II. Automated assembly process:

[0051] 1) Automatic positioning and suspension of the main tower: Install high-precision positioning sensors on the main tower to monitor its position. Use automated lifting equipment to accurately suspend the main tower on its base according to the 3D model and positioning sensor data. The main tower is located in the central position of the bridge.

[0052] 2) Install the main span stay cables on both sides of the main tower, which connect the main span to the main tower.

[0053] 3) Install the main span deck beam to connect the two sides of the main span.

[0054] 4) Install the stay cables connecting the main span and side span, which provide lateral support to ensure the stability of the structure.

[0055] 5) Install the bridge deck beam connecting the side span and the main span to form a complete structure. For cases where temporary support piers are needed to assist in support, use appropriate forms of pier structures and support locations.

[0056] Using intelligent construction technology based on Building Information Modeling (BIM), the automatic construction of temporary support piers is realized. During the assembly process, robot-assisted cantilever assembly can be introduced. These robots can accurately control the suspension and alignment process according to the preset program, reducing the difficulty and error of manual operation. Robots or automated equipment can construct temporary support piers at accurate positions according to BIM data, improving construction speed and accuracy.

[0057] It should be noted that data analysis and prediction algorithms are introduced to predict changes that may occur during the cantilever assembly process based on weather, temperature, and other factors, and to adjust the position and angle of the cantilever assembly in advance to ensure the final structural accuracy.

[0058] Three, real-time monitoring and automatic adjustment:

[0059] 1) Real-time monitoring, high-precision sensors and cameras are used to monitor the position, angle, and other structural parameters of the main tower, stay cables, and bridge deck; data is transmitted to the control center for calculation and analysis, and real-time adjustments are made to the cantilever assembly plan and temporary support pier construction plan; machine learning algorithms are used in the control center to train automatic adjustment models based on historical data and real-time sensor feedback, enabling automated equipment to gradually optimize the precision and speed of cantilever assembly.

[0060] 2) Automatic alignment adjustment, the automatic system analyzes sensor data to determine whether to fine-tune the position of stay cables and bridge deck, and if necessary, ensures accurate alignment of stay cables and bridge deck through automated lifting equipment; if manual assistance is involved in the process, augmented reality technology can be applied to project virtual cantilever assembly guidance onto the actual construction site through wearable devices or mobile devices, helping workers accurately perform the cantilever assembly process.

[0061] Four, joint and closure stage;

[0062] Perform joint and closure work according to engineering requirements.

[0063] 1) Joint processing parameters:

[0064] Joint position: specify the joint position of each part.

[0065] Joint form: select the appropriate joint form, such as butt weld, bolt connection, glue, etc.

[0066] Welding parameters: if welding is applied, set welding method, current, voltage, weld preparation, etc.

[0067] Bolt parameters: if bolt connection is used, set bolt specifications, number, tightening force, etc.

[0068] Glue parameters: if glue is applied, set the type, amount, curing time, etc. of the adhesive.

[0069] 2) Closure process parameters:

[0070] Closure sequence: Determine the closure sequence of different parts to ensure the stability of the overall structure.

[0071] Support system: Design a temporary support system, including support location, number, type, etc.

[0072] Positioning method: Set the positioning method, such as laser positioning, steel wire rope indexing, etc., to ensure accurate positioning of each part.

[0073] Hydraulic jack parameters: Use hydraulic jacks to adjust the position, set the working pressure, position, and movement speed of the jacks.

[0074] Closure speed: Control the speed of closure to ensure stability while improving construction efficiency.

[0075] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for segmented installation of steel beam road bridges combining temporary supports and cantilever construction, characterized in that: The steps are as follows: S1 Digital Modeling and Simulation: Before construction, a 3D model is created using digital modeling software based on the terrain conditions and bridge design requirements, including temporary supports, piers, precast steel beams, and construction parameters and pre-planned cantilever assembly sequence are set. S2 Automated Positioning and Suspension: On-site, an automated system is used to assist in suspending steel beam segments. The automated system includes several high-precision positioning sensors, cameras, laser rangefinders, and automated lifting equipment. The positioning sensors are installed on temporary supports and installed segments. The automated lifting equipment has programmable control capabilities and performs automatic positioning and suspension based on 3D models and data from the positioning sensors. S3 Real-time Data Feedback: The position, angle and alignment of the steel beam segments are monitored by positioning sensors and cameras installed on the steel beam segments, and the corresponding data is transmitted to the control center. The control center integrates sensor data, 3D model information, construction parameters and temporary support construction plans. The control center is set up as a command center on the construction site in the form of a remote control console. S4 Automated Operation and Adjustment: The automated lifting equipment suspends the steel beam to be installed in segments according to the predetermined instructions. The control center monitors the actual position and angle of the segments in real time based on sensor data. During the monitoring process, the accuracy is preset. If the accuracy does not meet the requirements, the operator is prompted to intervene manually. S5 manual operation and adjustment: The operator uses the console or control panel to fine-tune the section to be installed based on the real-time monitoring data provided by the control center until the section reaches the accurate installation position. S6 Real-time Guidance and Feedback: The control center's display screen will show the segment's predetermined position, angle, and actual alignment, providing real-time guidance to the operator. When the segment reaches accurate alignment, it will issue an audio or visual prompt. S7 Judgment and Construction of Temporary Supports: The control center sets an algorithm to calculate the required support force for the segmented steel beams. When it is determined that the support is insufficient, the control center initiates a temporary support construction plan. The forms of temporary supports include autonomous temporary supports, steel structure supports, sand cylinder supports, and wooden suspension supports. S8 Joint Treatment: During the assembly process, the joints of the precast steel beam bridge components are treated. The treatment methods include welding connection, bolt connection, locking connection, precision mechanical connection, ring plate connection, adhesive connection, and laser precision welding. S9 Closure Process: After the cantilever assembly is completed, the condition of each part of the steel beam bridge is checked. The position and deviation of the steel beam bridge are determined by laser positioning and measurement. Deformation, displacement and load data of the precast steel beam components are collected by positioning sensors. The control center simulates the closure process and makes contingency plans for any unexpected situations during the closure. Then, under the guidance of the control center, hydraulic jacks, cranes and wire ropes are used to control the shape of the bridge body to complete the closure.

2. The method for segmented installation of a steel beam road bridge combining temporary supports and cantilever construction according to claim 1, characterized in that: Construction parameters include cantilever assembly sequence parameters, automatic force adjustment parameters, and automated log recording parameters, as well as: Positioning accuracy parameters, which are the accuracy thresholds of the positioning sensor; Angle alignment parameter, which is the allowable value for angle error; Construction parameters for temporary supports: These parameters include the standard, height, and location of the temporary supports. The monitoring frequency parameter is the real-time monitoring frequency of the positioning sensor and camera, taking into account the delay caused by data transmission. Anomaly handling parameters are the set alarm thresholds for abnormal situations, as well as the alarm methods and emergency stop operations for the corresponding abnormal situations. Real-time feedback interface parameters, which determine the layout and data presentation of the control center display interface; Automatic alignment algorithm parameters are the alignment algorithm data requirements input to the control center during the alignment process of precast steel beam components.

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