Underwater damper for arched steel tower in construction condition

A damper, arch steel technology, applied in bridge parts, bridges, buildings, etc., can solve the problems of difficult maintenance and replacement, complex structure, etc., and achieve the effect of rapid acceleration attenuation, slow acceleration attenuation, and increased system damping.

Inactive Publication Date: 2012-11-14
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since other control methods except passive control require external energy, and the structure is complex, it is difficult to repair and replace

Method used

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  • Underwater damper for arched steel tower in construction condition
  • Underwater damper for arched steel tower in construction condition
  • Underwater damper for arched steel tower in construction condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, three types of underwater dampers are designed, all of which are symmetrical structures:

[0027] (1) Drilling type: Drill holes in the moving direction of the damper, use the water flow to develop through the pipeline to form turbulent flow, and the shear stress with the pipe wall increases the resistance. The damper is in the form of Picture 1-1 shown.

[0028] (2) Closed hole type: perforate the surface of the internal hollow damper (the top surface is not perforated, and the other five surfaces are perforated), so that the water flow generates turbulence inside the damper, so as to achieve the purpose of energy consumption. Such as Figure 1-2 shown.

[0029] (3) Open type: use uneven surfaces, such as "I" and "King", to increase the disturbance of the damper to the flow field, thereby increasing the damping, in the form of Figure 1-3 shown.

Embodiment 2

[0031] (1) The influence of volume on its vibration reduction effect

[0032] The size of the underwater temporary damper has a great influence on its vibration reduction effect. In this embodiment, three different volumes are considered: 10×10×10cm, 15×15×15cm, 20×20×20cm, to explore The effect of volume size on the vibration reduction performance of underwater dampers.

[0033] (2) Influence of porosity

[0034] The opening ratio of the underwater damper can affect the water flow through the vibration damping device, and then affect the resistance generated by the water flow to the vibration damping device. Therefore, this embodiment intends to explore the influence of different opening ratios on the vibration reduction effect of underwater temporary dampers, that is, under the premise of ensuring the same water passing area, the number and diameter of holes are adjusted to study the opening ratio (total The effect of the opening area ratio of the total area of ​​the upper...

Embodiment 3

[0049] Application of the underwater damper of the present invention:

[0050] (1) if Figure 7 As shown, six pulley blocks are set on the water construction platform, among which, four sets of pulley blocks are arranged along the direction of the bridge, and two sets of pulley blocks are arranged along the direction of the bridge;

[0051] (2) One end of the steel strand 1 is fixed on the top of the arch tower 3, and the other end passes through the block of pulleys of the construction platform on the water, and extends to a depth of about 5m underwater. Six groups of such steel strands are arranged in total;

[0052](3) Prefabricated six groups of underwater dampers 11 (honeycomb-shaped hollow steel caisson, holes are drilled on all sides except the top surface, and each hole is arranged along the horizontal direction and runs through the steel caisson, that is, closed and opened Hole type), the underwater damper 11 is installed at the other end of the steel strand;

[005...

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Abstract

The invention discloses an underwater damper for an arched steel tower in a construction condition. The underwater damper is one of a drilling type, a closed opening type and an opening type, which are symmetrical structures: (1) the drilling type is as follows: drilling in the motion direction of the damper, utilizing water flowing through a pipeline to form turbulence, and increasing resistance with shearing stress of the pipe wall; (2) the closed opening type is as follows: punching on the surface of a cubic box body with a hole inside, un-punching on the top surface and punching on the other five surfaces so as to generate generates turbulence inside the box body by water flow to consume energy; (3) the opening type is as follows: using an un-flat surface including an I type or a Chinese character Wang shape, so as to increase disturbance of the damper to the flow field and increase the damping. The acceleration of a spring oscillator system with the underwater damper is attenuated quickly, so that the underwater damper designed by the invention achieves the effect of increasing the system damping, and the effect is very remarkable.

Description

technical field [0001] The invention relates to an underwater damper for an arched steel tower in construction state. Background technique [0002] The material, cross-sectional shape, flow field state, construction state and structural form of the bridge tower determine the dynamic and aerodynamic characteristics of the bridge tower structure, such as damping, stiffness, and frequency, which are further determined by these internal and external factors. The wind-induced vibration of the bridge tower. Therefore, in response to the above-mentioned influencing factors, three aspects of vibration reduction measures can be taken. [0003] (1) Structural measures of bridge towers (materials, structural forms). The damping ratio of the steel bridge tower is smaller than that of the steel-concrete hybrid bridge tower, and also smaller than that of the concrete bridge tower. The wind-induced vibration of the concrete bridge tower with a larger damping ratio is smaller. In terms o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/14
Inventor 李加武白桦刘健新赵国辉刘万峰杨昀赵尚传
Owner CHANGAN UNIV
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