Construction method of temporary single diagonal bracing bridge tower

A technology of single-slant bridge towers and construction methods, which is applied to bridges, bridge construction, bridge parts, etc., and can solve problems such as high cost, difficulty in setting horizontal braces, and heavy workload

Pending Publication Date: 2021-08-31
中国铁路南宁局集团有限公司南宁铁路工程建设指挥部 +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 horizontal bracing is relatively long, and the efficiency of horizontal bracing is low. 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 column 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 the existing technology and equipment are becoming more and more prominent.

Method used

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  • Construction method of temporary single diagonal bracing bridge tower
  • Construction method of temporary single diagonal bracing bridge tower
  • Construction method of temporary single diagonal bracing bridge tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 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.

[0056] Table 2

[0057]

[0058] 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

[0059] 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.

[0060] table 3

[0061]

[0062] 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

[0063] 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.

[0064] Table 4

[0065]

[0066] 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 angle should be ...

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Abstract

The invention belongs to the field of bridge tower construction and discloses a construction method of a temporary single diagonal bracing bridge tower. The construction method comprises the following steps of: manufacturing a diagonal bracing device; gradually constructing a bridge tower; installing the diagonal bracing device between two tower columns in the construction process; and applying tension force to the diagonal bracing device so as to support the two tower columns in the transverse bridge direction. A traditional horizontal support construction method is improved; a triangular cone diagonal bracing mode is adopted, and the principle is that downward vertical force is applied to the top end of the diagonal bracing device, so that horizontal thrust in the transverse bridge direction is decomposed to act on the tower columns, and the outer side tensile strain of the bottoms of the tower columns of the bridge tower generated by self weight and construction loads is reduced. The method for applying the vertical force by a temporary device is simple, the internal force is adjustable, and the efficiency is high; under the requirement of the same supporting effect, the single temporary diagonal bracing can remarkably replace multiple groups of horizontal cross struts; the diagonal bracing is simple in structure;the diagonal bracing component is smaller in cross section than that of a traditional horizontal cross strut,lighter in weight and is convenient and fast in construction and has remarkable engineering significance and economic and social benefits.

Description

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

Claims

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Application Information

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IPC IPC(8): E01D21/00E01D19/14
CPCE01D21/00E01D19/14
Inventor 张嵛铭陈袁东王龙林郝天之于孟生张驰
Owner 中国铁路南宁局集团有限公司南宁铁路工程建设指挥部
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