Rotation and jacking integrated construction method and system for T-shaped bridge without closure section

Abstract

The invention relates to the field of bridge construction, in particular to a turning and jacking integrated construction method and system for a T-shaped structure bridge without a closure segment, and the method comprises the following steps: S1, carrying out T-shaped structure construction in a full framing construction mode; s2, side pier construction is carried out, and jacking bracket devices are pre-buried on side piers; s3, adopting an intelligent swivel system, and monitoring the swivel operation of the T-structure bridge through a measurement monitoring system; s4, temporary buttresses are arranged on the side piers, and synchronous jacking of the main beam is conducted through a micro jack group; s5, after the main beam is jacked to reach the designed elevation, a support is installed, and then the beam is dropped; and S6, the temporary supporting system and construction auxiliary facilities are dismantled, and system conversion is completed. The construction period can be shortened, the construction quality is improved, the construction safety is enhanced, and the construction cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to an integrated construction method and system for rotating and lifting a T-shaped bridge without a closure section. Background Technology

[0002] In bridge construction, traditional construction methods face numerous challenges when bridges need to cross existing railways, highways, or complex terrain. The traditional closure section construction process is cumbersome, involving multiple steps such as formwork installation, concrete pouring, curing, and prestressing tensioning, significantly extending the construction period. For example, in the construction of some large overpass bridges, the closure section alone can take several months, severely impacting the overall project schedule. Furthermore, the construction process is significantly affected by factors such as temperature deformation, shrinkage, and creep. Temperature changes cause concrete to expand and contract, generating significant stress in the closure section, which can easily lead to cracks if not properly controlled. Shrinkage and creep also cause concrete deformation, affecting the bridge's alignment and structural stress. To control these factors, complex temperature control measures and precise calculations are required during construction, demanding extremely high technical skills and increasing construction difficulty and cost. During overpass construction, extensive high-altitude work and on-site pouring operations disrupt traffic below, posing safety risks. For example, falling construction materials or tools could endanger railway operation, and noise and dust generated during concrete pouring can pollute the surrounding environment.

[0003] While the integrated construction technology for rotating and lifting T-shaped bridges without a closure section has solved some problems of traditional construction, it still faces technical bottlenecks in practical applications, such as difficulty in precision control, complexity of temporary support systems, and difficulty in ensuring jacking synchronization. During rotation construction, precise control of the beam's alignment and elevation is crucial; excessive errors can affect subsequent jacking and structural stress, but existing technologies struggle to meet high-precision requirements. The design and construction of temporary support systems are complex, increasing construction costs and safety risks. During jacking, simultaneous operation of multiple jacks is challenging; poor synchronization can lead to uneven stress on the beam, affecting construction quality and safety. Summary of the Invention

[0004] The purpose of this invention is to address the problems of difficulty in precision control, complexity of temporary support systems, and difficulty in ensuring jacking synchronization in the prior art, and to propose an integrated construction method and system for rotating and jacking a T-shaped bridge without a closure section.

[0005] On the one hand, this invention proposes an integrated construction method and system for rotating and lifting a T-shaped bridge without a closure section, including the following steps:

[0006] S1. T-structure construction is carried out using the full-span scaffolding construction method;

[0007] S2. Carry out the construction of the side piers and pre-embed the jacking bracket device on the side piers;

[0008] S3. An intelligent rotation system is adopted, and the rotation operation of the T-shaped bridge is monitored through a measurement and monitoring system;

[0009] S4. Temporary supports are set up on the side piers, and the main beam is lifted synchronously using a group of miniature jacks;

[0010] S5. After the main beam is lifted to the design elevation, the supports will be installed, and then the beam will be lowered.

[0011] S6. Dismantle the temporary support system and construction auxiliary facilities to complete the system conversion.

[0012] Preferably, the intelligent rotation system includes a rotating hinge and a hydraulic servo control system, wherein the hydraulic servo control system automatically adjusts the rotation speed and angle of the rotating hinge based on data fed back from the measurement and monitoring system.

[0013] Preferably, the temporary supports are prefabricated steel supports, with miniature jacks distributed on the temporary supports.

[0014] On the other hand, this invention proposes an integrated construction system for rotating and lifting a T-shaped bridge without a closure section, comprising:

[0015] A measurement and monitoring system is used to monitor the rotation attitude and lifting process in real time;

[0016] The intelligent rotation system is used to achieve precise rotation of the T-shaped bridge.

[0017] The jacking support system is used to provide jacking reaction force and achieve synchronous jacking of the main beam;

[0018] And safety protection systems to prevent materials from falling and to ensure the safety of construction workers.

[0019] Preferably, the measurement and monitoring system consists of a total station, a prism group, a pressure sensor, a displacement sensor, and a stress-strain monitor, used to monitor the rotation posture and the beam displacement, jack pressure, and bridge structural stress changes during the jacking process in real time.

[0020] Preferably, the jacking support system includes temporary supports, a group of miniature jacks, a main crossbeam, a pad beam, a corbel crossbeam, a corbel, and a jacking bracket device; the corbel is fixedly connected to the bottom of the main beam, the corbel crossbeam is set below the corbel, the pad beam is located between the corbel crossbeam and the main crossbeam, the main crossbeam is supported on the top of the temporary supports, and the group of miniature jacks is arranged between the temporary supports and the main crossbeam.

[0021] Preferably, the safety protection system includes a falling object protection system and a closed operating platform.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] 1. Shortened construction period: The construction without a closure section reduces the complicated procedures of the traditional closure section. After the rotation is completed, subsequent construction can proceed directly. The procedures are closely connected. Compared with the traditional construction method, the construction period can be shortened by about 20%-30%, effectively improving the efficiency of project construction.

[0024] 2. Improve construction quality: By utilizing high-precision measurement and monitoring methods, intelligent rotation systems, and finite element simulation techniques, the rotation accuracy is effectively controlled, reducing human error. The jacking process allows for millimeter-level fine-tuning of the beam end elevation, improving the overall smoothness and stability of the structure. Actual engineering testing shows that the flatness and alignment errors of the bridge structure can be controlled within a very small range, improving the long-term durability of the bridge and reducing subsequent maintenance costs.

[0025] 3. Enhanced construction safety: The jacking reaction force is transferred to the stable foundation through temporary supports, reducing the risk of materials falling during construction on existing lines. Temporary supports are installed promptly after jacking to shorten the duration of the cantilever state. The safety protection system effectively prevents materials and tools from slipping, ensuring the safety of construction personnel and avoiding safety accidents caused by falling materials during actual construction, thus ensuring the smooth progress of construction.

[0026] 4. Reduced construction costs: Although high-precision rotation equipment and monitoring systems are required initially, maintenance costs are low in the long run. Furthermore, it reduces material and labor costs for the closure section, resulting in an overall cost reduction of 10%-15%, achieving effective cost control. Attached Figure Description

[0027] Figure 1 An overall construction process diagram provided by the present invention;

[0028] Figure 2 This is a diagram showing the overall rotation of a bridge as provided in an embodiment of the present invention.

[0029] Figure 3 A diagram of a rotating ball joint provided in an embodiment of the present invention;

[0030] Figure 4 This is an overall design drawing of the lifting structure provided in an embodiment of the present invention;

[0031] Figure 5 This is a structural diagram of the bracket design provided in an embodiment of the present invention;

[0032] Figure 6 A model diagram of a cow leg and a jack provided in an embodiment of the present invention;

[0033] Figure 7 Stress diagram of the model support provided in the embodiment of the present invention;

[0034] Figure 8 The displacement diagram of the model support provided in the embodiment of the present invention.

[0035] Attached reference numerals: 1. Corbel; 2. Corbel crossbeam; 3. Pad beam; 4. Main crossbeam; 5. Temporary support; 6. Miniature jack group; 7. Main beam. Detailed Implementation

[0036] Example 1, as Figures 1-8 As shown, the present invention proposes an integrated construction method for rotating and lifting a T-shaped bridge without a closure section, comprising the following steps:

[0037] S1, T-structure construction phase: Based on the engineering design requirements, select appropriate specifications of scaffolding materials and construct the construction platform according to the standardized erection process. During construction, use measuring instruments to measure and adjust the verticality and spacing of the scaffolding to ensure its stability. During rebar tying, strictly adhere to the rebar specifications, quantity, and spacing specified in the design drawings, employing appropriate tying methods to ensure secure rebar connections. Before formwork installation, inspect and clean the formwork to ensure a smooth surface free of debris. During installation, ensure the flatness and sealing of the formwork, and implement reinforcement measures to prevent grout leakage. During concrete pouring, control the pouring speed based on the concrete characteristics and construction environment, employing reasonable vibration methods and times to ensure uniform concrete density.

[0038] S2. Side Abutment Construction and Lifting Support Pre-embedding Stage: During side abutment construction, when the rebar tying stage is reached, the lifting support device is accurately placed according to the design position, and precise measurement and positioning are performed using positioning tools and measuring instruments. During concrete pouring, a dedicated person is assigned to supervise and prevent the vibrator from touching the lifting support device. After the side abutment concrete has cured to the design strength, the position and elevation of the lifting support device are checked using measuring instruments such as a total station. If deviations are found, corresponding adjustment measures are taken according to the degree of deviation. For example, minor deviations can be adjusted by fine-tuning the fixing device, while larger deviations require re-embedding.

[0039] S3. T-Girder Bridge Rotation Stage: Before the rotation construction, finite element simulation software is used to simulate and analyze the rotation process of the T-girder bridge. Based on the simulation results, a counterweight scheme is determined, and the counterweight of the T-girder bridge is adjusted. During the rotation process, a total station and prism group monitor the rotation posture in real time, transmitting the data to the hydraulic servo control system. This system automatically adjusts the rotation speed and angle of the rotating hinge based on the data. Dedicated personnel are assigned to observe the rotation process. If any abnormalities are found, such as excessive structural deformation or rotation obstruction, the rotation operation is immediately stopped, and troubleshooting and handling are carried out.

[0040] S4. Main Girder 7 Synchronous Lifting Stage: Install temporary supports 5 on the side piers according to design requirements. After the temporary supports 5 are installed, conduct a stability check. Distribute the micro jacks 6 on the temporary supports 5 and connect the pressure sensors, displacement sensors, and stress monitoring equipment. Before lifting, calculate the lifting stages and lifting amount according to design requirements. During the lifting process, operate according to the staged lifting strategy, pausing after each stage to monitor the stress changes in the beam through the stress monitoring equipment and observe whether there is any abnormal deformation in the beam's appearance. If abnormal stress or excessive deformation occurs, immediately stop lifting, analyze the cause, take corresponding measures, and then continue lifting.

[0041] S5. Support Installation and Beam Lowering Stage: Before support installation, use specialized tools and measuring instruments to check and adjust the position and elevation of the pier pad stones to ensure they meet design requirements. Conduct a comprehensive inspection of the supports, including appearance, specifications, and quality. During installation, accurately place the supports on the pier pad stones, using measuring instruments and adjustment tools to precisely control the position and levelness of the supports. When lowering the beam, use a group of miniature jacks (6) to slowly lower the main beam (7), closely monitoring the condition of the main beam (7) and the supports. If there is any deviation or misalignment, make timely fine adjustments using the miniature jacks (6).

[0042] S6. System Conversion Phase: Following the dismantling sequence specified in the design, dismantle the temporary support system and construction auxiliary facilities using appropriate dismantling tools. During the dismantling process, monitor the stress and deformation of the bridge structure in real time using stress-strain monitoring instruments and displacement monitoring equipment. If any abnormalities occur, such as sudden stress changes or excessive deformation, immediately stop the dismantling work, analyze the cause, and take appropriate measures such as adding temporary supports. Dismantling can only continue after the situation stabilizes. After dismantling is completed, conduct a comprehensive inspection of the bridge structure to ensure its safety and stability after the system conversion.

[0043] Example 2, as Figure 4 As shown, the present invention proposes an integrated construction system for rotating and lifting a T-shaped bridge without a closure section, comprising the following:

[0044] Measurement and Monitoring System: A total station and prism assembly will be installed at appropriate locations on the construction site, ensuring their measurement range covers the rotation area. The system will be debugged and calibrated according to the instrument usage specifications. Pressure and displacement sensors will be installed at corresponding positions on the miniature jack group 6 and the main beam 7 to ensure the accuracy of the measurement data. Stress and strain monitoring instruments will be deployed at key parts of the bridge structure according to design requirements, such as different cross-sectional positions of the main beam 7. These instruments will be calibrated and debugged before construction to ensure accurate monitoring of stress changes in the bridge structure. During construction, the measurement and monitoring system equipment will be regularly inspected and maintained to ensure its normal operation.

[0045] Intelligent Rotation System: During the manufacturing and installation of the rotating hinge, strict adherence to design requirements is maintained to ensure its precision and performance. The hydraulic servo control system is correctly connected to the rotating hinge and measurement monitoring system, and system debugging and testing are conducted. Before the rotation operation, a comprehensive inspection of the intelligent rotation system is performed, including system operational stability, data transmission accuracy, fault warning, and automatic protection functions. During the rotation process, the system's operating status is closely monitored; if any abnormalities occur, the system issues an alarm, and appropriate measures are taken immediately.

[0046] Lifting support system: Temporary support pier 5 adopts prefabricated steel support piers, which are processed in the factory and assembled on site. The connection method between its top and the main crossbeam 4 is as follows: Figure 4 As shown, ensure the contact surfaces are flat and tightly fitted (gap ≤ 2mm). When installing the main crossbeam 4, use... Figure 4 Using the elevation control line shown as a reference, the axis of the level should be calibrated to ensure it is perpendicular to the axis of the main beam, with a deviation ≤1°. The thickness of the pad beam 3 should be selected based on the measured distance between the corbel beam 2 and the main beam 4, and its installation position should be aligned with... Figure 4 The design positioning lines should be aligned, with a deviation ≤5mm. The connecting bolts between bracket beam 2 and bracket 1 must be in accordance with... Figure 4 Tighten to the specified torque (design torque 350-400 N·m). After connection, check the flatness of the joints to ensure uniform contact with the support beam 3. The number and position of the miniature jack group 6 should strictly follow the instructions. Figure 4 In accordance with the design requirements, the deviation between the central axis of each jack and the load-bearing axis of the temporary support 5 shall be ≤3mm, so as to ensure that the lifting force transmission path meets the design expectations.

[0047] Safety Protection System: A fall protection system will be constructed above the existing railway line according to design requirements. The double-layered protective netting must be securely installed, and its coverage area must meet the protection requirements of the jacking operation area. A closed operating platform will be erected on the pier top. The height and strength of the platform's fencing must meet safety regulations. Safe passages and emergency escape devices will be provided and ensured to be unobstructed. During construction, the safety protection system will be regularly inspected and maintained, including checking for damage to the protective netting and the stability of the operating platform. Any problems found will be addressed promptly.

[0048] In summary, the present invention has the following beneficial effects:

[0049] 1. Shortened construction period: The construction without a closure section reduces the complicated procedures of the traditional closure section. After the rotation is completed, subsequent construction can proceed directly. The procedures are closely connected. Compared with the traditional construction method, the construction period can be shortened by about 20%-30%, effectively improving the efficiency of project construction.

[0050] 2. Improve construction quality: By utilizing high-precision measurement and monitoring methods, intelligent rotation systems, and finite element simulation techniques, the rotation accuracy is effectively controlled, reducing human error. The jacking process allows for millimeter-level fine-tuning of the beam end elevation, improving the overall smoothness and stability of the structure. Actual engineering testing shows that the flatness and alignment errors of the bridge structure can be controlled within a very small range, improving the long-term durability of the bridge and reducing subsequent maintenance costs.

[0051] 3. Enhanced construction safety: The jacking reaction force is transferred to the stable foundation through temporary supports, reducing the risk of materials falling during construction on existing lines. Temporary supports are installed promptly after jacking to shorten the duration of the cantilever state. The safety protection system effectively prevents materials and tools from slipping, ensuring the safety of construction personnel and avoiding safety accidents caused by falling materials during actual construction, thus ensuring the smooth progress of construction.

[0052] 4. Reduced construction costs: Although high-precision rotation equipment and monitoring systems are required initially, maintenance costs are low in the long run. Furthermore, it reduces material and labor costs for the closure section, resulting in an overall cost reduction of 10%-15%, achieving effective cost control.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A method for integrated construction of a T-shaped bridge without a closure section, characterized in that, Includes the following steps: S1. T-structure construction is carried out using the full-span scaffolding construction method; S2. Carry out the construction of the side piers and pre-embed the jacking bracket device on the side piers; S3. An intelligent rotation system is adopted, and the rotation operation of the T-shaped bridge is monitored through a measurement and monitoring system; S4. Temporary supports (5) are set up on the side piers, and the main beam (7) is simultaneously lifted using a group of miniature jacks (6); S5. After the main beam (7) is lifted to the design elevation, the supports are installed, and then the beam is lowered. S6. Dismantle the temporary support system and construction auxiliary facilities to complete the system conversion.

2. The integrated construction method for rotating and lifting a T-shaped bridge without a closure section as described in claim 1, characterized in that, The intelligent rotation system includes a rotating hinge and a hydraulic servo control system. The hydraulic servo control system automatically adjusts the rotation speed and angle of the rotating hinge based on the data fed back by the measurement and monitoring system.

3. The integrated construction method for rotating and lifting a T-shaped bridge without a closure section as described in claim 1, characterized in that, The temporary support (5) is a prefabricated steel support, and the miniature jack group (6) is distributed on the temporary support (5).

4. A T-shaped bridge rotation and jacking integrated construction system without a closure section, characterized in that, include: A measurement and monitoring system is used to monitor the rotation attitude and lifting process in real time; The intelligent rotation system is used to achieve precise rotation of the T-shaped bridge. The jacking support system is used to provide jacking reaction force and achieve synchronous jacking of the main beam; And safety protection systems to prevent materials from falling and to ensure the safety of construction workers.

5. The integrated construction system for rotating and lifting a T-shaped bridge without a closure section as described in claim 4, characterized in that, The measurement and monitoring system consists of a total station, a prism group, a pressure sensor, a displacement sensor, and a stress-strain monitor. It is used to monitor the rotation posture and the beam displacement, jack pressure, and stress changes in the bridge structure during the jacking process in real time.

6. The integrated construction system for rotating and lifting a T-shaped bridge without a closure section as described in claim 4, characterized in that, The jacking support system includes temporary supports (5), a group of miniature jacks (6), a main crossbeam (4), a pad beam (3), a corbel crossbeam (2), a corbel (1), and a jacking bracket device; the corbel (1) is fixedly connected to the bottom of the main beam (7), the corbel crossbeam (2) is set below the corbel (1), the pad beam (3) is located between the corbel crossbeam (2) and the main crossbeam (4), the main crossbeam (4) is supported on the top of the temporary supports (5), and the group of miniature jacks (6) is arranged between the temporary supports (5) and the main crossbeam (4).

7. The integrated construction system for rotating and lifting a T-shaped bridge without a closure section as described in claim 4, characterized in that, The safety protection system includes a falling object protection system and a closed operating platform.

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