News - Congratulations: A complete set of technology: Multi-connected continuous beam dynamic adjustment lifting transformation with collaborative rotary slope won the second prize

With the support of the China Highway and Transportation Society, the Maintenance and Management Branch of the China Highway and Transportation Society launched the “Second Highway Maintenance Engineering Innovation Competition” collection and selection activity for the whole country in 2023.

The event lasted for one year, and after three rounds of open, fair and impartial review, a total of 59 innovative cases with high technical content, good economic benefits, great social influence, and wide promotion and application value and prospects were selected. Among them, there are 6 high-quality projects (special prize), 15 quality projects (first prize) and 38 high-quality projects (second prize). At the 13th annual academic meeting of the Maintenance and Management Branch of China Highway and Transportation Society, a grand award ceremony was held to commend the units and individuals who completed the award-winning projects.

A complete set of technology: Multi-connected continuous beam dynamic adjustment lifting transformation with collaborative rotary slope

The DONG SAN HUAN Project (Hadong Road to Huanghe Road) is located in Daowai District, Harbin City, with a total length of about 3.9 kilometers. The lifting reconstruction bridge project starts from 400 meters on the north side of Pioneer Road in the south, and the total length of the bridge is 420 meters, which is the project with the highest technical difficulty in view of synchronization of system. The lifting part has three sections, with a total length of 300 meters each, accounting for 71.4% of the total length of the bridge reconstruction, and the total weight is more than 32,000 tons. The longitudinal slope of the continuous beam was adjusted from 3.65% to 0.18%, and the height reached 6.897 meters, both of which were in the forefront of the country and set the highest record in severe cold areas.

Bridge photo

Technical Plan

1.For the lifting of the pre-stressed cap beam, due to less relevant experience, our unit has set up a technical research team to conduct many simulation analyses on key issues such as cylinder layout, limit structure installation, and temporary support stability in the lifting process of the pre-stressed cap beam, so as to ensure the structural safety of the pre-stressed cap beam in the lifting process.

Cylinder layout

2、Restricted by the construction space of the abutment to the pier, the raft foundation-steel distribution beam lifting method is adopted at the abutment. The lifting temporary support point is close to 6 meters from the beam end, and in order to prevent the bridge deck from cracking, the bridge deck is reinforced with pre-stressed carbon fiber plates. After the lifting is completed, the temporary support height is close to 10 meters, and in addition to the conventional connection system, a row of steel auxiliary supports is also set up to ensure the stability of the support.

Key Technology

1、Analysis of the stress state under a variety of lifting conditions According to the complex bridge lifting conditions, the stress state analysis of raft foundation-distribution beam, cushion cap-holding column beam, cushion cap-prestressed cap beam, steel corbel-beam body and other lifting methods is carried out to ensure the safety of lifting equipment, bridge structure and temporary structure.

2、Dynamic rotation adjustment control technology of multi-connected continuous beam cylinder to ensure that the linear shape is consistent in the process of continuous beam lifting, and the rotary slope adjustment lifting method with the transition pier as the rotation point is adopted. Through the PLC hydraulic synchronous control system, the proportion of slope adjustment and lifting is determined according to the bridge span combination. Each pier is equipped with a hydraulic power station, and multiple hydraulic power stations are interconnected and communicate with the master control platform. The general control platform selects the lifting point, sets the lifting ratio and issues the lifting displacement command, and each hydraulic pump station can be operated by a single machine for local fine-tuning.

PLC Hydraulic synchronous control system

3、Horizontal force control technology of bridge slope adjustment and lifting For the longitudinal and transverse horizontal force generated by the change of beam attitude in the process of bridge slope adjustment and lifting, two methods of active control and passive control are adopted to reduce or avoid adverse effects. In terms of active control, the steel ball hinge bearing is designed to offset the relative sliding caused by the projection elongation of the beam during the slope adjustment process through angular rotation, and the sliding bearing system is constructed to reduce the friction coefficient. In terms of passive control, the large stiffness limit structure is used to resist the horizontal force generated by the change of beam attitude through reasonable arrangement.

4、Application of standardized bridge lifting support cushion block According to the actual needs of the project and the results of force analysis, the design is carried out from three aspects: construction space, local pressure bearing and support stability. The three types of cushion blocks include “solid cushion plate”, “cylinder ball cap” and “standardized cushion block”, which are suitable for lifting preparation stage, lifting start stage and normal lifting stage respectively.

5、The main function of the monitoring platform is to establish a bridge lifting database, and to realize the effective application of the overall data of the bridge by scanning the code to fill in the bridge deck elevation, pier lifting height and other information, and to form the overall lifting progress information of the bridge.

Remote monitoring, real-time data feedback and summary

Implementation Plan

The existing bridge in the chemical section of Dong San Huan Expressway Project was launched on September 19, 2022, and all the lifting was put in place after 68 days, which greatly shortened the construction period of the bridge reconstruction, promoted green development, and helped achieve the dual carbon goal. After the completion of the construction, the existing bridge, which was completed in 2012, will “flutter its wings” and fly 10 meters into the air, connecting with the new bridges on both sides, further enhancing the comprehensive traffic capacity of the road network in the eastern part of Harbin.

Harbin DONG SAN HUAN Bridge Lifting Project

More Bridge Lifting Application

Similar bridge synchronous lifting applications include Singapore bearing underpinning project, Hengshui overhaul section beamlifting, Beijing-Shanghai Expressway Huai’an section expansion lifting project, Beijing-Shanghai high-speed railway Tianjin bridge correction project, Pakistan intercity railway project, Wuhan-Shenzhen Expressway Yongxing interchange C ramp synchronous lifting and correction, a total of more than 50 bridges, highly in line with the national strategic goal of green, low-carbon and high-quality development.