Opposite-pulling combination device of bridge tower inclined support and construction method

A combined device and oblique support technology, which is applied in the direction of bridges, bridge construction, bridge parts, etc., can solve the problems of low work efficiency, high cost, heavy workload, etc., and achieve good construction quality, good economic benefits, and low time cost. Effect

Active Publication Date: 2021-09-03
广西北投交通养护科技集团有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are three traditional methods for controlling the stress of bridge tower columns: one is the full house support method, which has a large workload, low work efficiency and greater danger; the other is to set horizontal horizontal braces. Although this method reduces the workload, However, it cannot overcome the deformation and lateral displacement of the bridge tower column due to its own weight; the third is to use jacks to change the passive support in method 2 into active support. Although this method improves the shortcomings of the above two methods, the horizontal brace structure The top is long and the internal force is large. In order to ensure the stability of the force, a large cross-section is adopted, resulting in a large weight. Therefore, the existing horizontal cross-bracing is difficult, expensive, time-consuming and poor in reliability.
Especially when the bridge tower is high and the slope is large, it is necessary to set up multiple horizontal horizontal braces or combine the above-mentioned solutions, and the disadvantages of existing technologies and equipment are becoming more and more prominent.

Method used

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  • Opposite-pulling combination device of bridge tower inclined support and construction method
  • Opposite-pulling combination device of bridge tower inclined support and construction method
  • Opposite-pulling combination device of bridge tower inclined support and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment one: tension force F=200kN is set, the height h=28m of bridge pylon column being subjected to horizontal lateral force, changes α angle (from small to large), calculates and obtains f 横向 and the stress σ outside the root of the pylon column, and verify whether the structure is safe.

[0072] Table 2

[0073]

[0074] It can be seen from Table 2 that when F and h are constant, the smaller the α angle, the larger the lateral f of the diagonal brace member 21 decomposed, which can effectively offset the stress σ generated by the self-weight of the pylon column 10. From the data in Table 2, it can be seen that when the α angle is within 45°, the stress σ of the concrete outside the 10 roots of the bridge tower column does not exceed 1MPa; when the α angle is less than 1°, the σ 钢筋 It is 201.377MPa, which exceeds the yield stress of the steel bar ([σ]=145MPa), so the α angle should not be less than 1°. To sum up, the value range of α angle should be 2°-45°. ...

Embodiment 2

[0075] Embodiment two: tension force F=400kN, bridge pylon column 10 are subjected to the height h=28m of horizontal transverse force, change α angle (from small to large), calculate and obtain the stress of f transverse direction and bridge pylon column 10 root outsides σ, and verify that the structure is safe.

[0076] table 3

[0077]

[0078] It can be seen from Table 3 that when F and h are constant, the smaller the α angle is, the larger the lateral f of the diagonal bracing member 21 will be, which can effectively offset the stress σ generated by the self-weight of the pylon column 10. From the data in Table 2, it can be seen that when the α angle is within 45°, the stress σ of the concrete outside the 10 roots of the bridge tower column does not exceed 1MPa; when the α angle is less than 1°, the σ 钢筋 It is 201.377MPa, which exceeds the yield stress of the steel bar ([σ]=145MPa), so the α angle should not be less than 1°. To sum up, the value range of α angle shoul...

Embodiment 3

[0079] Embodiment three: tension force F=200kN is set, the height h=32m of the bridge pylon column 10 subjected to the horizontal lateral force, the angle α is changed (from small to large), and the stress σ on the outside of the f transverse direction and the bridge pylon column root is calculated , and verify that the structure is safe.

[0080] Table 4

[0081]

[0082]

[0083] It can be seen from Table 4 that when F and h are constant, the smaller the α angle, the larger the lateral f of the diagonal bracing member 21, which can effectively offset the stress σ generated by the self-weight of the pylon column 10. From the data in Table 2, it can be seen that when the α angle is 40°, the stress σ of the concrete outside the 10 roots of the pylon column exceeds 1 MPa; when the α angle is less than 1°, the σ 钢筋 It is 197.618MPa, which exceeds the yield stress of the steel bar ([σ]=145MPa), so the α angle should not be less than 1°. To sum up, the value range of α angl...

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Abstract

The invention relates to the field of bridge tower construction, and particularly discloses an opposite-pulling combination device of a bridge tower inclined support and a construction method, the opposite-pulling combination device comprises at least one pair of inclined supporting devices and a force application device, and the pair of inclined supporting devices are arranged at different heights between tower columns of a bridge tower. A plurality of triangular cone inclined struts are adopted, and downward vertical force is applied to the top ends of the inclined supporting pieces, so that a plurality of horizontal thrust in the transverse bridge direction is decomposed to act on the tower column, and tensile strain generated by self weight and construction load on the outer side of the bottom of the tower column of the bridge tower and the outer side of the tower column of the bridge tower at the first inclined strut is reduced. The method for applying the vertical force by the inclined supporting piece is simple, the internal force is adjustable, and the efficiency is high; under the requirement of the same supporting effect, the temporary multi-diagonal supporting piece can remarkably reduce the number of temporary horizontal cross braces, the cross section of a diagonal supporting component has the advantages of being small in internal force, small in cross section, light in weight, convenient and fast to construct and the like compared with a traditional multi-horizontal cross brace, and the opposite-pulling combination device of a bridge tower inclined support has remarkable engineering significance and economic and social benefits.

Description

technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a pair-pull combination device and a construction method for oblique supports of bridge towers. Background technique [0002] Most of the pylon columns and horizontal bridges are designed as inclined structures, the purpose of which is to express the personality and visual effects of the towering pylons. The overall shape of the bridge reflects the architect's pursuit of aesthetics and cultural expression. More importantly, the design of the bridge tower must be suitable for the layout of the stay cables or main cables, the force transmission should be simple and clear, and under the action of the dead load, the bridge tower should be in the state of axial compression as much as possible. Generally speaking, the layout of the bridge tower has several types such as single column, A-shaped, inverted Y-shaped and H-shaped. Among them, the A-shape and inverted Y-shape ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E01D19/14
CPCE01D21/00E01D19/14
Inventor 郝天之龙夏毅李明珊于孟生王华
Owner 广西北投交通养护科技集团有限公司
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