Application of Dynamic Unstressed State Method in Vertical Rotation Construction of Bridges

Li, Wen Wu; Zhang, Zhe; Huang, Cai Liang

doi:10.4028/www.scientific.net/amr.255-260.988

Cited by 4 publications

(7 citation statements)

References 6 publications

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“…This method effectively reduces the initial tension by using a larger initial traction angle. Compared to traditional VRMs [13][14][15][16], the relay rotating method, in which the tower was built on ground, could significantly reduce risky work high above the ground. Moreover, two rotating struts replaced the strong temporary tower in the traditional way and save cost and time.…”

Section: Discussionmentioning

confidence: 99%

“…The proposed method is compared with traditional method, as shown in Table 1, giving improvement and advantages of relay vertical rotation. First, for traditional method, a temporary tower should be made on the ground to provide an upward pull to the steel tower [14][15][16]. As the steel tower is rotated to vertical position at last, the temporary tower should be taller than the steel tower.…”

Section: Project Descriptionmentioning

confidence: 99%

“…Ma et al [13] simulated the rotating structure in three dimensions of a concrete-filled steel tube concrete basket arch bridge, and the most unfavorable stress conditions were determined. Li et al [14,15] studied a negative angle vertical rotating construction method in China and analyzed the vertical pouring, rotation, closure process, and other key construction processes. Also, he proposed a dynamic unstressed FEM to simulate bridge construction of vertical rotation through the whole rotation process.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on Mechanical Behavior of Relay Vertical Rotation for Steel Arch Tower

Zhou

Xie

et al. 2023

Advances in Civil Engineering

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The vertical rotation method is a special option for steel tower construction in fabricated bridge. The tall tower is prefabricated on the ground and then pulled to its designed position using steel wires. Traditional vertical rotation method always uses a taller temporary structure to provide an upward pull force to lift the rotation member; however, the temporary structure would spend much time, cost, and work high above the ground. For instance, the Jinwu Bridge tower’s weight was so heavy that the ordinary rotating method was not feasible. Therefore, a relay traction system with two auxiliary struts was employed to rotate the tower. The chief strut was first rotated to an inclined angle of 60° by an assistant strut to decrease the lateral component force of tension. Then, the tower was pulled from horizontal to vertical by the chief strut. Furthermore, a numerical model was established to analyze the mechanical behavior of the inner force, stress, and deformation of the chief strut, assistant strut, and tower. The study identified critical conditions such as the reverse of axial force for the assistant strut, intervention of back cables, and release of cable tension. The relay traction system effectively reduced initial pulling stress, spending less cost and time. Besides, the analysis method can be an innovate reference for other vertical rotating projects.

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Section: Discussionmentioning

confidence: 99%

Section: Project Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis on Mechanical Behavior of Relay Vertical Rotation for Steel Arch Tower

Zhou

Xie

et al. 2023

Advances in Civil Engineering

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“…To ensure the construction safety of the new bridge across the existing railways and highways and reduce the interference to normal operation of the existing railways and highways, swivel construction technology has become the main method for the construction of over-line continuous beam bridges [1][2][3]. As a new bridge construction technology, swivel bridge construction can avoid unfavorable terrain and ensure that cross-line traffic is not interrupted compared to traditional bridge construction technology [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al found that fiber could improve water impermeability. The water absorption is almost halved when polypropylene fiber content is 0.6 kg/m 3 [18]. Guo et al studied the permeability of superabsorbent polymer (SAP) modified concrete.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Moisture Damage Prevention of a Spherical Hinge Structure of a Swivel Bridge

Guo

Wang³

et al. 2020

Coatings

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As a key component of a swivel bridge, the spherical hinge is a steel-concrete structure, which is susceptible to moisture damage during waiting time. In this paper, spherical hinge moisture damage prevention is investigated comprehensively from two aspects of impermeable concrete and steel-concrete interface waterproof coating. Three impermeable concretes were prepared and tested by the compressive strength test, splitting tensile test, four-point bending test and the impermeability test. The test results illustrated that addition of cementitious capillary crystalline active masterbatch (CCCAM) and polypropylene fiber (PP) could improve the toughness and brittleness of concrete. The addition of CCCAM was an effective technique for improving the permeability of concrete. However, the incorporation of PP and CCCAM at the same time cannot improve the impermeability of concrete. This may be because the chaotic support structure formed by PP prevents the infiltration and uniform dispersion of CCCAM. A waterproof coating consolidation performance test was proposed to quantify the interface bond strength of waterproof coatings and assess the impact of temperature, moisture and freeze-thawing cycles on consolidation performance of waterproof coatings. The test results showed that temperature had a significant effect on the interface consolidation property of waterproof coatings and the optimal dosage of SBS modified asphalt (SBS), polyurethane (PLT) and unsaturated polyester resin (UPLS) waterproof coating is 1.18kg/m2, 0.95kg/m2 and 1.15kg/m2, respectively. Moreover, it was found that PLS waterproof coating maintained excellent properties in complex environment. This is because PLS has excellent shear strength and rubber characteristics, and it can form a hard–soft–hard transition layer between the concrete and steel, reducing the impact of environmental factors.

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Application of Fuzzy-ISM-MICMAC in the Risk Analysis Affecting Swivel Bridge Construction Spanning Existing Railway Lines: A Case Study

Peng,

Wang,

Chen

et al. 2023

Buildings

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Swivel bridge construction (SBC) technology has significant advantages in building bridges that span existing railway lines (ERLs), but it also entails complex risks from ‘skylight’ windows and railway boundaries. A notable challenge is the relationships and interdependencies among these risks, which collectively increase safety hazards through mutual influence. Prior research has typically focused on mitigating the risks inherent in particular tasks or operations, with less emphasis on the risks from interdependencies. A novel framework was developed to explore this research gap by integrating fuzzy logic, interpretive structural modeling (ISM) and the cross-impact matrix multiplication applied to classification (MICMAC) approach (Fuzzy-ISM-MICMAC) to investigate the relationships and interdependencies among the risks of SBC spanning ERLs and the critical points of risk control. Furthermore, the data collected from a literature review, a case analysis and expert interviews resulted in 28 risk factors. Then, the application of ISM distilled complex risk relationships into a clear, multilevel hierarchy, accurately illustrating the complex interrelationships among risk factors. Combined with MICMAC analysis, the research findings indicate that preliminary works such as the selection of construction technology, scheme design, construction rehearsal and the provision of safety facilities are essential for preventing risks in SBC spanning ERLs. We applied these findings to the double T-structure swivel construction of the Xiaojizhuang Bridge, where its practicality and efficiency were thoroughly tested and validated. This research’s critical contribution is identifying, clarifying and visualizing the interrelationships of the complex risk factors of SBC spanning ERLs and providing specific solutions for safety management in similar bridge construction projects. The research results and risk control recommendations offer valuable insights for managing other swivel bridge construction risks.

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Application of Dynamic Unstressed State Method in Vertical Rotation Construction of Bridges

Cited by 4 publications

References 6 publications

Analysis on Mechanical Behavior of Relay Vertical Rotation for Steel Arch Tower

Analysis on Mechanical Behavior of Relay Vertical Rotation for Steel Arch Tower

Investigation on Moisture Damage Prevention of a Spherical Hinge Structure of a Swivel Bridge

Application of Fuzzy-ISM-MICMAC in the Risk Analysis Affecting Swivel Bridge Construction Spanning Existing Railway Lines: A Case Study

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