Large-span steel structure corridor overall lifting and rapid mounting system and technology thereof

Abstract

The invention discloses a large-span steel structure corridor overall lifting rapid installation system and technology. The installation system comprises an inclination angle monitoring module, a steel truss end displacement detection module, a data monitoring module, a detection early warning module and an early warning removing module. According to the inclination angle monitoring module, a high-precision inclination angle sensor is pasted to the middle position of a truss, the inclination angle theta of the steel truss is monitored in real time through the high-precision inclination angle sensor, the sensor is connected with a PC terminal, and inclination angle data are received in real time. Therefore, the construction progress is accelerated, and the construction cost is reduced; the synchronism of the large-span steel truss in the whole lifting process can be accurately monitored; the working procedures of pausing lifting and measuring every time lifting is conducted by a certain distance in the traditional construction process are omitted, continuous lifting is achieved, and the construction quality and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a rapid installation system for the overall lifting of a large-span steel structure corridor and its process. Background Technology

[0002] As cities continue to evolve, more magnificent buildings will emerge. The research and application of key technologies for the cumulative sliding and overall lifting of super-large span sky bridges will have broad application prospects in spatial connection system architecture.

[0003] Compared to traditional large-span aerial corridor assembly construction techniques, the cumulative sliding and overall lifting of ultra-large span aerial corridors not only helps improve construction efficiency but also ensures construction quality. Most of the assembly work is completed on the ground, avoiding interference with other professional construction work, facilitating schedule control, reducing installation time, reducing hoisting machinery costs, and improving hoisting safety.

[0004] With economic and technological development, many buildings have a need to construct large-span sky bridges. Due to their good economic benefits and magnificent appearance, it is foreseeable that in the next few years, the number of buildings using the cumulative sliding and overall lifting technology of ultra-large span sky bridges will gradually increase.

[0005] The existing overall lifting process for large-span steel structure corridors lacks monitoring of the overall lifting process of the large-span steel trusses, which makes it impossible to determine the synchronicity of the lifting. Therefore, after lifting one end of the distance, it is necessary to lift and measure, which reduces the construction quality and efficiency. At the same time, it is necessary to monitor the stress and deformation of the steel truss body during the lifting process, which increases the construction cost. Summary of the Invention

[0006] Based on the problems in the background technology, the present invention proposes a rapid installation system for the overall lifting of a large-span steel structure corridor, comprising: an inclination monitoring module, a steel truss end displacement detection module, a data monitoring module, a detection and early warning module, and an early warning cancellation module; The tilt angle monitoring module: A high-precision tilt angle sensor is attached to the middle position of the truss. The high-precision tilt angle sensor is used to monitor the tilt angle θ of the steel truss in real time. The sensor is connected to a PC terminal to receive tilt angle data in real time. The steel truss end displacement detection module is used to detect the position relationship of each point during the lifting process when the steel truss tilts, with the projection position of the truss center point on the ground remaining unchanged. The data monitoring module, through the constraints of the tilt angle monitoring module and the steel truss end displacement detection module, provides real-time feedback on the tilt angle and the height difference between the two sides of the truss. ; The detection and early warning module: when the height difference between the two sides of the truss When the set warning is triggered, the warning system will issue an alarm and start timing. If the continuous warning lasts for more than 10 seconds, the lifting needs to be paused and the truss attitude adjusted. The warning cancellation module: when the height difference between the two sides of the truss When the truss attitude adjustment ends and the setting threshold for lifting the warning is reached, the lifting work can continue.

[0007] A rapid installation process for the overall lifting of a large-span steel structure connecting corridor includes the following steps: S1: First, establish a model of the super-large span aerial corridor and simulate the cumulative sliding process in segments; S2: After the super-large span sky bridge model is slid to the design position, the lifting and installation process begins. Lifting supports are set up using the structural columns of the towers on both sides, and lifting equipment is installed as the upper lifting point. The lower lifting device is welded to the upper surface of the upper chord of the truss structure and connected to the ground anchor as the lower lifting point. S3: Utilize existing sliding construction models to conduct overall lifting construction simulation analysis; S4: During the detailed design, the connection point of the corridor will be set at a 15-degree angled joint. During the lifting process, it is necessary to ensure that the steel strand connecting the upper lifting point (i.e., the lifting device) and the lower lifting point (i.e., the ground anchor) is always vertical. This requires both accurate final positioning of the sliding and precise positioning of the upper lifting point of the lifting support and the lower lifting point of the truss lower chord during the initial positioning. S5: High-carbon steel welding is performed on the closure joint of the connecting corridor. Preheating is carried out before welding. After the thick plate welding is completed, insulation cotton is covered on both sides of the weld to slow down cooling. During the welding process, welding control is required. In addition to the internal quality requirements of the weld, welding control also needs to focus on controlling the impact of deformation during the welding process on the overall structural installation accuracy. Therefore, in addition to doing a good job in welding process control, close coordination with measurement and monitoring is also required. A further technical solution of the present invention is that in step S3, the analysis content of the construction simulation analysis includes the design of the lifting point and lifting support, the selection of the lifting device and steel strand, the overall stability and structural deformation during lifting, the verification of asynchronous lifting and the impact of the overall lifting construction on the completed structure. The upper and lower lifting points are connected by steel strands, and the structure is lifted to the design position by the extension and retraction of the hydraulic cylinder of the lifting equipment.

[0008] A further technical solution of the present invention is that in step S4, stress and displacement monitoring should be performed on the structure being lifted and the lifting support during the lifting process. At the same time, the vertical displacement of each point should be observed after each fixed number of strokes of lifting. If the difference between the points is large, adjustments need to be made before continuing the lifting, so as to ensure the synchronization of the lifting construction and ensure the stability of the posture of the structure being lifted.

[0009] A further technical solution of the present invention is that in step S5, preheating before welding is an effective measure to prevent hydrogen-induced cracking in the welding of low alloy high-strength steel. It can control the welding cooling rate, reduce or avoid the generation of hardened martensite in the heat-affected zone, reduce the hardness of the welding heat-affected zone, and at the same time reduce welding stress, which helps hydrogen escape.

[0010] A further technical solution of the present invention is that in step S5, the welder promptly cleans the slag on the surface of the weld and the spatter on both sides, checks the appearance quality of the weld, and after the inspection is qualified, marks the welder's steel stamp or makes a record at the specified location. After the welding is completed, the weld is completely covered with 300mm around the weld for at least 24 hours to allow the weld to cool slowly to room temperature and minimize the residual stress of the welding.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: By using the main structural columns as assembly and sliding platforms, cumulative sliding can be achieved without damaging the longitudinal reinforcement of the concrete columns, thereby improving construction progress and reducing construction costs. It also allows for precise monitoring of the synchronicity during the overall lifting of large-span steel trusses. Furthermore, it eliminates the need for pausing and measuring at intervals during traditional construction, enabling continuous lifting and improving construction quality and efficiency. The dynamic stability of the steel truss during lifting indicates stable structural stress, with member stress and deformation within a controllable range, eliminating the need for stress and deformation monitoring of the steel truss during the lifting process and further reducing construction costs. Attached Figure Description

[0012] Figure 1 This is a system block diagram of a rapid installation system for the overall lifting of a large-span steel structure connecting corridor and its process proposed in this invention. Figure 2 This is a diagram showing the positional relationship of various points of the steel truss during asynchronous lifting of a large-span steel structure corridor, as proposed in this invention, and its process. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative effort are all within the scope of protection of the present invention.

[0014] like Figures 1-2 As shown in the figure, this embodiment proposes a rapid installation process for the overall lifting of a large-span steel structure corridor, including the following steps: S1: First, establish a model of the super-large span aerial corridor and simulate the cumulative sliding process in segments; After establishing a 3D model of the ultra-long span aerial corridor in SAP2000 software, a detailed load simulation was performed, along with deformation and stress calculations. Simultaneously, the model was imported into ANSYS software for refined segmented simulation to improve structural stability during the lifting process. In ANSYS, the geometric model was first imported into DesignModeler or SpaceClaim, and minor defects (such as gaps and overlapping surfaces) were repaired to ensure mesh quality. Then, material parameters were defined in Engineering Data, and material and contact relationships were set. Parametric optimization was performed using Workbench's Parameter Set function. Solver options were then set in Solution. After the simulation, key data were analyzed, such as equivalent stress to assess structural strength; total deformation to analyze displacement; and displacement analysis to verify local stiffness. S2: After the super-large span sky bridge model is slid to the design position, the lifting and installation process begins. Lifting supports are set up using the structural columns of the towers on both sides, and lifting equipment is installed as the upper lifting point. The lower lifting device is welded to the upper surface of the upper chord of the truss structure and connected to the ground anchor as the lower lifting point. S3: Utilize existing sliding construction models to conduct overall lifting construction simulation analysis; Immersive construction process simulation is achieved using ZW3D steel structure virtual simulation software, which helps to improve process verification and safety assessment. S4: During the detailed design, the connection point of the corridor will be set at a 15-degree angled joint. During the lifting process, it is necessary to ensure that the steel strand connecting the upper lifting point (i.e., the lifting device) and the lower lifting point (i.e., the ground anchor) is always vertical. This requires both accurate final positioning of the sliding and precise positioning of the upper lifting point of the lifting support and the lower lifting point of the truss lower chord during the initial positioning. S5: High carbon steel welding is carried out on the closure joint of the connecting corridor. Preheating is carried out before welding. After the thick plate welding is completed, insulation cotton is covered on both sides of the weld to slow down the cooling. During the welding process, the welding needs to be controlled. In addition to the internal quality requirements of the weld, the welding control also needs to focus on controlling the impact of deformation during the welding process on the overall structural installation accuracy. Therefore, in addition to doing a good job in welding process control, it is also necessary to closely coordinate with measurement and monitoring. The analysis includes the design of lifting points and lifting supports, selection of lifting devices and steel strands, overall stability and structural deformation during lifting, verification of asynchronous lifting and the impact of overall lifting construction on the completed structure. The upper and lower lifting points are connected by steel strands, and the structure is lifted to the design position by the extension and retraction of the hydraulic cylinders of the lifting equipment. During the lifting process, stress and displacement monitoring should be carried out on the structure being lifted and the lifting support. At the same time, the vertical displacement of each point should be observed after each fixed number of strokes. If the difference between the points is large, adjustments need to be made before continuing the lifting to ensure the synchronization of the lifting construction and to ensure the stability of the posture of the structure being lifted. Preheating before welding is an effective measure to prevent hydrogen-induced cracking in low-alloy high-strength steel welding. It can control the welding cooling rate, reduce or avoid the generation of hardened martensite in the heat-affected zone, reduce the hardness of the weld heat-affected zone, and at the same time reduce welding stress, which helps hydrogen escape. Welders should promptly clean the slag and spatter on both sides of the weld surface, check the appearance quality of the weld, and mark the welder's stamp or make a record in the designated location after the inspection is qualified. After welding is completed, the welder should completely cover the area around the weld with insulation cotton for at least 24 hours to allow the weld to cool slowly to room temperature and minimize the residual welding stress. A rapid installation system for the overall lifting of a large-span steel structure corridor includes: an inclination monitoring module, a steel truss end displacement detection module, a data monitoring module, a detection and early warning module, and an early warning cancellation module; Tilt monitoring module: A high-precision tilt sensor is attached to the middle of the truss. The high-precision tilt sensor monitors the tilt angle θ of the steel truss in real time. The sensor is connected to a PC terminal to receive tilt angle data in real time. Steel truss end displacement detection module: used to detect the position relationship of each point during the lifting process when the steel truss tilts and the projection position of the truss center point on the ground remains unchanged. Data monitoring module: Through the constraints of the tilt angle monitoring module and the steel truss end displacement detection module, it provides real-time feedback on the tilt angle and the height difference between the two sides of the truss. ; Detection and early warning module: When the height difference between the two sides of the truss When the set warning is triggered, the warning system will issue an alarm and start timing. If the continuous warning lasts for more than 10 seconds, the lifting needs to be paused and the truss attitude adjusted. Warning cancellation module: When the height difference between the two sides of the truss When the truss attitude adjustment ends and the setting threshold for lifting the warning is reached, the lifting work can continue.

[0015] In this invention, a model of an ultra-large span aerial corridor is first established, and the cumulative sliding process is simulated in segments. The analysis includes the design of lifting points and lifting supports, the selection of lifting devices and steel strands, the overall stability and structural deformation during lifting, the verification of asynchronous lifting, and the impact of overall lifting construction on the completed structure. The upper and lower lifting points are connected by steel strands, and the structure is lifted to the design position by the extension and retraction of the hydraulic cylinders of the lifting equipment. At the same time, stress and displacement monitoring should be carried out on the lifted structure and lifting supports during the lifting process. After each fixed number of strokes, the vertical displacement of each point is observed. If the difference between the points is large, adjustments need to be made before continuing the lifting to ensure the synchronicity of the lifting construction and the stability of the posture of the lifted structure. Then, after the super-large span sky bridge model is slid down to directly below the design position, the lifting and installation process begins. Lifting supports are set up using the structural columns of the towers on both sides, and lifting equipment is installed as the lifting upper hoisting point. The lower hoisting device is welded to the upper surface of the upper chord of the truss structure and connected to the ground anchor as the lifting lower hoisting point. Two main trusses are first assembled on the east side of the projection of the sky bridge on the basement roof. After sliding down one span, the third main truss is assembled, and so on, accumulating the sliding. Then, the existing sliding construction model is used to conduct an overall lifting construction simulation analysis. The analysis includes the design of the lifting point and lifting support, the selection of the lifting device and steel strand, the overall stability and structural deformation during lifting, the verification of asynchronous lifting, and the impact of the overall lifting construction on the completed structure. Next, in the detailed design, the closing position of the connecting corridor is set as a 15-degree angled connection. During the lifting process, it is necessary to ensure that the upper lifting point, i.e., the lifting device, and the lower lifting point, i.e. the steel strand connecting the ground anchor, are always vertical. This requires both accurate final sliding positioning and accurate positioning of the upper lifting point of the lifting support and the lower lifting point of the truss lower chord. During the construction process, two main trusses are first assembled on the east side of the projection of the connecting corridor on the top slab of the basement. After sliding one span, the third main truss is assembled, and so on, accumulating the sliding. The main structure columns are used as the assembly and sliding platform, while not damaging the longitudinal reinforcement of the concrete columns. Finally, high-carbon steel welding is carried out on the closure joint of the connecting corridor. Preheating is performed before welding. After the thick plate welding is completed, insulation cotton is covered on both sides of the weld to slow cooling. During the welding process, welding control is required. In addition to the internal quality requirements of the weld, welding control also needs to focus on controlling the impact of deformation during the welding process on the overall structural installation accuracy. Therefore, in addition to doing a good job in welding process control, it is also necessary to closely coordinate with measurement and monitoring. Preheating before welding is an effective measure to prevent hydrogen-induced cracking in low alloy high-strength steel welding. It can control the welding cooling rate, reduce or avoid the generation of hardened martensite in the heat-affected zone, reduce the hardness of the weld heat-affected zone, and reduce welding stress, which helps hydrogen escape. During the welding process, the welder should clean the slag on the weld surface and the spatter on both sides in a timely manner, check the appearance quality of the weld, and mark the welder's steel stamp or make a record in the specified position after the inspection is qualified. After the welding is completed, the welder should completely cover the area around the weld with insulation cotton for at least 24 hours to allow the weld to cool slowly to room temperature and eliminate the residual welding stress to a minimum. Simultaneously, during the lifting process, a high-precision tilt sensor is attached to the middle position of the truss. This sensor monitors the tilt angle θ of the steel truss in real time. The sensor is connected to a PC terminal to receive tilt data in real time. When the steel truss is detected to be tilting, the projection position of the truss center point relative to the ground remains unchanged. The positional relationship of each point during the lifting process is as follows: Figure 2 As shown, where: =Lsin θ; =L(1-cosθ) Single-sided height adjustment: =2 =2Lsin θ, and the asynchronous lifting distance can be obtained from the above formula; based on the above principle, the monitoring system provides real-time feedback on the tilt angle and the height difference between the two sides of the truss. When the height difference between the two sides of the truss When the preset warning is triggered, the warning system issues an alarm and starts timing. If the continuous warning lasts for more than 10 seconds, lifting must be paused to adjust the truss attitude. When the height difference between the two sides of the truss... When the truss attitude adjustment ends and the setting threshold for lifting the warning is reached, the lifting work can continue.

[0016] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid installation system for the overall lifting of a large-span steel structure connecting corridor, characterized in that, include: Tilt angle monitoring module, steel truss end displacement detection module, data monitoring module, detection early warning module, and early warning cancellation module; The tilt angle monitoring module: A high-precision tilt angle sensor is attached to the middle position of the truss. The high-precision tilt angle sensor is used to monitor the tilt angle θ of the steel truss in real time. The sensor is connected to a PC terminal to receive tilt angle data in real time. The steel truss end displacement detection module is used to detect the position relationship of each point during the lifting process when the steel truss tilts, with the projection position of the truss center point on the ground remaining unchanged. The data monitoring module: through the constraints of the tilt angle monitoring module and the steel truss end displacement detection module, provides real-time feedback on the tilt angle and the height difference ∆H between the two sides of the truss; The detection and early warning module: When the height difference ∆H between the two sides of the truss touches the set warning, the early warning system issues an alarm and starts timing. If the continuous warning lasts for more than 10 seconds, the lifting needs to be paused and the truss attitude needs to be adjusted. The warning cancellation module: When the height difference ∆H between the two sides of the truss decreases to the set warning cancellation value, the truss attitude adjustment ends and the lifting construction can continue.

2. A rapid installation process for the overall lifting of a large-span steel structure connecting corridor, characterized in that: Includes the following steps: S1: First, establish a model of the super-large span aerial corridor and simulate the cumulative sliding process in segments; S2: After the super-large span sky bridge model is slid to the design position, the lifting and installation process begins. Lifting supports are set up using the structural columns of the towers on both sides, and lifting equipment is installed as the upper lifting point. The lower lifting device is welded to the upper surface of the upper chord of the truss structure and connected to the ground anchor as the lower lifting point. S3: Utilize existing sliding construction models to conduct overall lifting construction simulation analysis; S4: During the detailed design, the connection point of the corridor will be set at a 15-degree angled joint. During the lifting process, it is necessary to ensure that the steel strand connecting the upper lifting point (i.e., the lifting device) and the lower lifting point (i.e., the ground anchor) is always vertical. This requires both accurate final positioning of the sliding and precise positioning of the upper lifting point of the lifting support and the lower lifting point of the truss lower chord during the initial positioning. S5: High-carbon steel welding is carried out on the closure joint of the connecting corridor. Preheating is performed before welding. After the thick plate welding is completed, insulation cotton is covered on both sides of the weld to slow down the cooling. During the welding process, the welding needs to be controlled. In addition to the internal quality requirements of the weld, the welding control also needs to focus on controlling the impact of deformation during the welding process on the overall structural installation accuracy. Therefore, in addition to doing a good job in welding process control, it is also necessary to closely coordinate with measurement and monitoring.

3. The rapid installation process for the overall lifting of a large-span steel structure connecting corridor according to claim 2, characterized in that, In S3, the analysis content of the construction simulation analysis includes the design of the lifting point and lifting support, the selection of the lifting device and steel strand, the overall stability and structural deformation during lifting, the verification of asynchronous lifting and the impact of the overall lifting construction on the completed structure. The upper and lower lifting points are connected by steel strands, and the structure is lifted to the design position by the extension and retraction of the hydraulic cylinder of the lifting equipment.

4. The rapid installation process for the overall lifting of a large-span steel structure corridor according to claim 2, characterized in that, In step S4, stress and displacement monitoring should be performed on the structure being lifted and the lifting support during the lifting process. At the same time, the vertical displacement of each point should be observed after each fixed number of strokes of lifting. If the difference between the points is large, adjustments need to be made before continuing the lifting process to ensure the synchronization of the lifting construction and to ensure the stability of the posture of the structure being lifted.

5. The rapid installation process for the overall lifting of a large-span steel structure connecting corridor according to claim 2, characterized in that, In S5, preheating before welding is an effective measure to prevent hydrogen-induced cracking in the welding of low-alloy high-strength steel. It can control the welding cooling rate, reduce or avoid the generation of hardened martensite in the heat-affected zone, reduce the hardness of the welding heat-affected zone, and at the same time reduce welding stress, which helps hydrogen escape.

6. The rapid installation process for the overall lifting of a large-span steel structure corridor according to claim 2, characterized in that, In step S5, the welder promptly cleans the slag on the weld surface and the spatter on both sides, checks the appearance quality of the weld, and stamps the welder's steel stamp or makes a record at the designated location after the inspection is qualified. After welding is completed, the welder completely covers 300mm around the weld with insulation cotton for at least 24 hours to allow the weld to cool slowly to room temperature and minimize the residual welding stress.

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