Method and steel box girder for supplementing internal weld at joint of U-rib of steel box girder and panel

A steel box girder and joint technology, applied in bridges, bridge maintenance, bridge reinforcement, etc., can solve problems such as fatigue cracks, affecting bridge life and driving safety, fatigue cracking, etc., to extend service life, reduce maintenance costs, reduce Effects of direct and indirect losses

Active Publication Date: 2018-12-18
WUHAN LIXIN AUTOMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the great advantages of orthogonal special-shaped steel structures in bridge construction, more than 100 bridges with this structure have been built in my country in the past 30 years. However, due to technical reasons, in the past, they could only be welded on one side of the outer side of the U rib, which was subject to repeated alternating loads. Fatigue cracks are easily generated from the weld root and propagate to the thickness of the panel or the direction of the weld throat
As a result, a large number of fatigue cracks occurred in the bridge of this structure within 15 years after it was opened to traffic, which seriously affected the service life of the bridge and traffic safety.

Method used

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  • Method and steel box girder for supplementing internal weld at joint of U-rib of steel box girder and panel
  • Method and steel box girder for supplementing internal weld at joint of U-rib of steel box girder and panel
  • Method and steel box girder for supplementing internal weld at joint of U-rib of steel box girder and panel

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as Figure 1-Figure 4 As shown, a method for supplementing the inner weld at the connection between the U-rib of the steel box girder and the panel of this embodiment includes the following steps:

[0042] S1, Open a copy hole on the steel box girder of the built steel bridge to facilitate the welding system to enter the U rib;

[0043] S2, placing the welding system of the inner weld supplementary equipment in the space 400 formed by the inner U-rib 100 and the panel 300 of the steel box girder from the profiling hole 102;

[0044] S3, the welding system walks along the length direction of the U-rib 100, and simultaneously welds the U-rib 100 and the panel 300 from the inside of the U-rib 100;

[0045] S4, after the welding is completed, the position of the profiling hole 102 is filled, and after filling, the filling position of the profiling hole is treated with anti-rust coating.

[0046] Among them, for different steel box girder structures, there are two imp...

Embodiment approach 1

[0047] Embodiment 1: S1 is specifically, for example, Figure 1-Figure 4 As shown, a profiling hole 102 is provided at one end of the U rib 100 in the steel box girder or profiling holes 102 are respectively provided at both ends of the U rib 100 or profiling holes 102 are provided on the panel 300 . The profiling hole can be of any shape and size to facilitate the welding system to enter the U-rib. The position of the copy hole can be flexibly selected. In order to minimize the damage to the U rib, the copy hole can be set as close to the end as possible, so that the welding system can enter the space formed between the U rib and the panel. It is convenient to fill after welding, and it does not affect other U ribs to supplement the inner weld. The position of the profiling hole can be set on the top of the U-rib or the side of the U-rib.

Embodiment approach 2

[0048] Implementation mode two: if Figure 1-Figure 4 As shown, when there is an end sealing plate 101 in the U rib 100, the profiled hole 102 is opened at the position of the U rib 100 close to the end sealing plate 101, and the end sealing plate 101 Cutting: when the U-rib 100 has no end sealing plate 101 , open the profiling hole 102 at any position of the U-rib 100 . Setting the profiling hole close to the end sealing plate can facilitate the cutting of the end sealing plate from the profiling hole, so that the welding system can walk into the space between the U rib and the panel.

[0049] The welding system of this embodiment adopts the automatic overhead welding process of gas shielded welding. The automatic overhead welding process can ensure that the welding system moves upwards and weld between the U-rib and the panel upwards; using gas shielded welding, compared with other welding methods, the visibility of the arc and molten pool is better, and the welding process c...

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Abstract

The invention relates to a method for supplementing an internal weld at the joint of a U rib of a steel box girder and a panel, and a steel box girder. The method comprises the following steps: S1, aprofiling hole is arranged on the steel box girder; S2, the welding system of the internal weld supplementary equipment enters the enclosed space formed by the U rib and the panel in the steel box girder from the position of the copying hole; S3, the welding system travels along the length direction of the U rib, and simultaneously welds the U rib and the panel from the inside of the U rib; S4, after the welding is completed, the position of the copying hole is filled. The invention opens a profiling hole in the steel box girder so that the welding system enters between the U rib and the panel, Adding internal weld to U-rib of existing steel bridge can strengthen the opening defects in U-rib, prolong the service life of bridge, ensure the safety of driving, increase the social and economicbenefits of bridge operation, reduce the maintenance cost of bridge, and the direct and indirect losses caused by closed traffic during the maintenance period.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a method for supplementing inner weld seams at the connection between U ribs and panels of steel box girders and the steel box girder. Background technique [0002] Due to the great advantages of orthogonal special-shaped steel structures in bridge construction, more than 100 bridges with this structure have been built in my country in the past 30 years. However, due to technical reasons, in the past, they could only be welded on one side of the outer side of the U rib, which was subject to repeated alternating loads. Fatigue cracks are likely to occur from the weld root and expand to the thickness of the panel or the direction of the weld throat. As a result, a large number of fatigue cracks occurred in the bridge of this structure within 15 years after it was opened to traffic, seriously affecting the service life of the bridge and driving safety. In view of this current situat...

Claims

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Application Information

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IPC IPC(8): E01D2/04E01D22/00B23K9/16B23K9/32
CPCB23K9/16B23K9/32E01D2/04E01D22/00
Inventor 舒先庆陈积里王成林高兴
Owner WUHAN LIXIN AUTOMATION TECH CO LTD
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