CN105507166B - A kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam - Google Patents

A kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam Download PDF

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Publication number
CN105507166B
CN105507166B CN201510977476.5A CN201510977476A CN105507166B CN 105507166 B CN105507166 B CN 105507166B CN 201510977476 A CN201510977476 A CN 201510977476A CN 105507166 B CN105507166 B CN 105507166B
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China
Prior art keywords
ribbed stiffener
vertical ribbed
vertical
strength bolt
drum
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CN105507166A (en
Inventor
王丽
田越
鞠晓臣
潘永杰
郭辉
张雯
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Beijing Tieche Engineering Testing Co.,Ltd.
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China Academy of Railway Sciences Corp Ltd CARS
Railway Engineering Research Institute of CARS
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/30Metal

Abstract

The invention discloses a kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam, including:Step 1, the real bridge to railway steel bridge checks whether have crackle, if crackle, then carry out step 2 if determining the vertical ribbed stiffener end of the drum web of railway steel bridge;Step 2, the crack tip using magnetic drill in vertical ribbed stiffener end bores circular hole as stop hole, and the diameter of stop hole is identical with the thickness of drum web, is 10mm, while the crack tip of vertical ribbed stiffener end is fallen into stop hole;Step 3, is connected at the two ends of vertical ribbed stiffener using angle steel with drum web, to increase local stiffness, reduces out-of-plane deformation.Beneficial effects of the present invention:Stop hole is beaten by crack tip, and increases angle steel in drum web, effectively prevent further expanding for crackle;Verify that the method using angle steel is increased in web is effectively increased local stiffness, reduces out-of-plane deformation through fatigue test.

Description

A kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam
Technical field
The present invention relates to technical field of civil engineering, in particular to a kind of vertical ribbed stiffener of railway steel bridge drum beam The reinforcement means of end fatigue crack.
Background technology
Before the eighties in 20th century, when plate girder or bridge deck beam in length and breadth is designed, in order to avoid tension flange is produced Fatigue crack, ribbed stiffener or diaphragm plate are only welded to connect with compression flange, tension flange then by ribbed stiffener truncate or It is connected by the way of polishing holds out against with tension flange.There is substantial amounts of fatigue cracking in China's existing steel bridges in this construction Example.Such crackle Producing reason, including following aspects:(1) oscillation crosswise that train serpentine locomotion causes;(2) rail Bias of the vertical load for longitudinal-beam web plate that road centre-to-centre spacing causes with the difference of longeron centre-to-centre spacing;(3) vertical load sill Deformation causes the out-of-plane deformation of longitudinal-beam web plate.The reason for these three loads aspect, add the ratio of rigidity abdomen of constructively ribbed stiffener The bending stiffness out of plane of plate is much larger, cause web out-of-plane deformation be concentrated in ribbed stiffener end of welding bead and tension flange it Between minim gap at.Research shows that maximum stress in bend occurs the welding toe in ribbed stiffener and web joint angle end of welding bead, And direction of principal tensile stress is vertical at this, so fatigue crack is general produced from ribbed stiffener end of welding bead, and approximately along level Directional Extension.Originally such crackle is generally parallel to stress field, will not the safety of bridge be caused to have a strong impact on, but work as Crack Tip When end turns to vertical with stress field, crackle may further expand to the edge of a wing, cause girder to lose bearing capacity, therefore should be timely Repaired.
Currently for drum beam web vertical ribbed stiffener end weld construction, mainly there are two kinds of Scheme of Strengthening:One is to loosen Constrained at small―gap suture, such as bore stop hole, reduced or discharge the constraint to web out-of-plane deformation, when stop hole cannot prevent crackle from expanding Zhan Shi, can also coordinate the vertical ribbed stiffener increase web gap length of cut portion, to reduce the secondary stress of out-of-plane deformation generation;Two It is, by strengthening rigidity at this, such as directly to connect ribbed stiffener by fillet welding seam weld with the edge of a wing, to prevent the generation of out-of-plane deformation, separately The outer method that can be also attached ribbed stiffener and the edge of a wing using angle steel.Processing mode one of the current China's steel bridge to such crackle As reinforced by the way of being connected with the edge of a wing, this reinforcement means need to punch on the edge of a wing, there is certain weakening to the edge of a wing Effect.If it is too many to reduced beam section when reinforcing so that reduce the bearing capacity of drum beam, or there are other constructions or connect Make cannot to be punched on the edge of a wing or during installation difficulty, this reinforcement means cannot be implemented.
The content of the invention
To solve the above problems, solve drum beam web vertical ribbed stiffener end it is an object of the invention to provide one kind and split Line problem, while avoiding the reinforcement means punched on drum flange of beam.
The invention provides a kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam, the reinforcing Method includes:
Step 1, the real bridge to railway steel bridge checks, determines that the vertical of drum web of the railway steel bridge is put more energy into Whether rib end has crackle, if crackle, then carries out step 2;
Step 2, the crack tip using magnetic drill in the vertical ribbed stiffener end bores circular hole as stop hole, described to stop The diameter of ceasma is identical with the thickness of the drum web, is 10mm, while the crack tip of the vertical ribbed stiffener end Fall into the stop hole;
Step 3, is connected at the two ends of the vertical ribbed stiffener using angle steel with the drum web, local firm to increase Degree, reduces out-of-plane deformation.
Used as further improvement of the invention, the step 3 is specifically included:
Step 31, is drilled using magnetic drill in the both sides of the vertical ribbed stiffener, bores seven apertures in the human head per side, as with the angle The high-strength bolt keyhole of steel connection;
Step 32, installs angle steel, totally four in the both sides of the vertical ribbed stiffener respectively.
Used as further improvement of the invention, the stop hole and the high-strength bolt keyhole share hole position.
Used as further improvement of the invention, the sectional dimension of the angle steel is L160mmx100mmx10mm, a length of 560mm。
Used as further improvement of the invention, the angle steel is arranged on the lower flange of the drum beam apart from the railway steel bridge At 10mm, wherein, leg of angle one side punching long is connected with the drum web, the one side of the leg of angle length It is parallel with the vertical ribbed stiffener, and away from the vertical ribbed stiffener 10mm.
Used as further improvement of the invention, the high-strength bolt keyhole is in quincuncial arrangement, the high-strength bolt keyhole Hole back gauge be 40mm, the vertical pitch of holes of the high-strength bolt keyhole is between 160mm, the transverse holes of the high-strength bolt keyhole Away from being 65mm, wherein, the transverse direction that the angle steel is attached on longeron is the transverse direction of the high-strength bolt keyhole, and the angle steel is installed On to longeron is vertically the vertical of the high-strength bolt keyhole.
Used as further improvement of the invention, high-strength bolt is using M22 high-strength bolts, the diameter deviation in hole:φ24± 0.50mm, bolt hole away from deviation ± 0.4mm.
Beneficial effects of the present invention are:
1st, stop hole is beaten by crack tip, and increases angle steel in drum web, effectively prevent crackle enters one Step extension;
2nd, verify that the method using angle steel is increased in web is effectively increased local stiffness, reduces through fatigue test Out-of-plane deformation.
Brief description of the drawings
Fig. 1 is a kind of reinforcing of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam described in the embodiment of the present invention The schematic flow sheet of method;
Fig. 2 is the schematic diagram of angle steel reinforced in Fig. 1;
Fig. 3 is the schematic diagram of angle steel in Fig. 1.
Specific embodiment
The present invention is described in further detail below by specific embodiment and with reference to accompanying drawing.
Embodiment 1, as shown in figure 1, a kind of vertical ribbed stiffener end fatigue of railway steel bridge drum beam of the embodiment of the present invention The reinforcement means of crackle, by taking the longeron of railway 64m through truss girders as an example.The longeron material is Q345qD steel, and span is 8m, 1290mm high;Upper lower flange 240mm wide, upper lower flange thickness 16mm, drum web 1258mm high, drum web thickness 10mm; Drum web both sides are respectively provided with 5 vertical ribbed stiffeners.The reinforcement means includes:
Step 1, the real bridge to railway steel bridge checks, determines the vertical ribbed stiffener end of the drum web of railway steel bridge Whether portion has crackle, if crackle, then carries out step 2;
Step 2, the crack tip using magnetic drill in vertical ribbed stiffener end bores circular hole as stop hole, stop hole and height Strength bolt keyhole shares hole position, if cannot utilize high-strength bolt keyhole position, should keep suitable distance with bolt hole, and distance is really Determine foundation《Railroad bridge Code for design of steel structures》(TB10002.2-2005) perform, diameter and the drum web of stop hole Thickness is identical, is 10mm, while the crack tip of vertical ribbed stiffener end is fallen into stop hole;
Step 3, is connected at the two ends of vertical ribbed stiffener using angle steel with drum web, to increase local stiffness, is reduced Out-of-plane deformation, specifically includes:
Step 31, is drilled using magnetic drill in the both sides of vertical ribbed stiffener, bores seven apertures in the human head per side, as with Bolted angle connection High-strength bolt keyhole, high-strength bolt keyhole is in quincuncial arrangement, and the hole back gauge of high-strength bolt keyhole is 40mm, high-strength bolt keyhole Vertical pitch of holes be 160mm, the horizontal pitch of holes of high-strength bolt keyhole is 65mm, wherein, angle steel is attached to the horizontal stroke on longeron To the transverse direction for high-strength bolt keyhole, it is vertically the vertical of high-strength bolt keyhole that angle steel is attached on longeron, and high-strength bolt is adopted The diameter deviation for using M22 high-strength bolts, High-strength bolt hole is:24 ± 0.50mm of φ, bolt hole away from deviation ± 0.4mm;
Step 32, installs angle steel in the both sides of vertical ribbed stiffener respectively, and totally four, the sectional dimension of steel is L160mmx100mmx10mm, a length of 560mm, angle steel are arranged at the lower flange 10mm of the drum beam of railway steel bridge, its In, leg of angle one side punching long is connected with drum web, and the one side of leg of angle length is parallel with vertical ribbed stiffener, and away from Vertical ribbed stiffener 10mm.
Should be noted that high-strength bolt should be followed from plate middle part progressively to the erection sequence of both sides during installation.
Verify that the method using angle steel is increased in drum web is effectively increased local stiffness, subtracts through fatigue test Small out-of-plane deformation.After finding crackle at 70,000 times, take the method to be reinforced, (railway 64m is exceeded by larger stress amplitude More than about 4 times of base-supporting steel bridge actual stress width) after 2,000,000 circulations, crackle maximum only extends 3mm, effectively slow down and splits Line expansion rate.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (5)

1. a kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam, it is characterised in that the reinforcing side Method includes:
Step 1, the real bridge to railway steel bridge checks, determines the vertical ribbed stiffener end of the drum web of the railway steel bridge Whether portion has crackle, if crackle, then carries out step 2;
Step 2, the crack tip using magnetic drill in the vertical ribbed stiffener end bores circular hole as stop hole, the stop hole Diameter it is identical with the thickness of the drum web, be 10mm, while the crack tip of the vertical ribbed stiffener end falls into In the stop hole;
Step 3, is connected at the two ends of the vertical ribbed stiffener using angle steel with the drum web, to increase local stiffness, Reduce out-of-plane deformation,
Specifically include:
Step 31, is drilled using magnetic drill in the both sides of the vertical ribbed stiffener, and seven apertures in the human head is bored per side, is connected as with the angle steel The high-strength bolt keyhole for connecing, the high-strength bolt keyhole is in quincuncial arrangement, and the stop hole is common with the high-strength bolt keyhole Use hole position;
Step 32, installs angle steel, totally four, leg of angle one side punching long in the both sides of the vertical ribbed stiffener respectively It is connected with the drum web, the one side of the leg of angle length is parallel with the vertical ribbed stiffener.
2. reinforcement means according to claim 1, it is characterised in that the sectional dimension of the angle steel is L160mmx100mmx10mm, a length of 560mm.
3. reinforcement means according to claim 2, it is characterised in that the angle steel is arranged on apart from the railway steel bridge Vertical ribbed stiffener 10mm described in an identity distance of the leg of angle length at the lower flange 10mm of drum beam.
4. reinforcement means according to claim 1, it is characterised in that the hole back gauge of the high-strength bolt keyhole is 40mm, The vertical pitch of holes of the high-strength bolt keyhole is 160mm, and the horizontal pitch of holes of the high-strength bolt keyhole is 65mm, wherein, The transverse direction that the angle steel is attached on longeron is the transverse direction of the high-strength bolt keyhole, and the angle steel is attached to vertical on longeron It is vertical for the high-strength bolt keyhole.
5. reinforcement means according to claim 1, it is characterised in that high-strength bolt uses M22 high-strength bolts, the diameter in hole Deviation is:Bolt hole away from deviation ± 0.4mm.
CN201510977476.5A 2015-12-23 2015-12-23 A kind of reinforcement means of the vertical ribbed stiffener end fatigue crack of railway steel bridge drum beam Active CN105507166B (en)

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Publication number Priority date Publication date Assignee Title
CN108942080A (en) * 2018-06-25 2018-12-07 武汉理工大学 The compound crack arrest method and device of steel construction crackle
CN110219254A (en) * 2019-07-05 2019-09-10 河海大学 A kind of boring method for steel bridge deck top plate and the bead crack reparation of U rib
CN113277033A (en) * 2021-05-24 2021-08-20 中国舰船研究设计中心 Minor bulkhead crack repair method

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Publication number Priority date Publication date Assignee Title
JP2000288726A (en) * 1999-04-02 2000-10-17 Topy Ind Ltd Structure for repairing and/or reinforcing crack from welded filet part of sole plate in steel bridge
JP2007107185A (en) * 2005-10-11 2007-04-26 Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd Structure and method for repairing and reinforcing steel bridge
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CN104060549A (en) * 2014-06-30 2014-09-24 长安大学 Bolted steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure
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Publication number Priority date Publication date Assignee Title
JP2000288726A (en) * 1999-04-02 2000-10-17 Topy Ind Ltd Structure for repairing and/or reinforcing crack from welded filet part of sole plate in steel bridge
JP2007107185A (en) * 2005-10-11 2007-04-26 Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd Structure and method for repairing and reinforcing steel bridge
CN203097040U (en) * 2013-01-29 2013-07-31 朱崇钊 Antifatigue prestressing force steel-concrete combination beam
CN104060526A (en) * 2014-06-30 2014-09-24 长安大学 Anti-fatigue structure detail of vertical stiffening rib at web plate gap of steel bridge
CN104060549A (en) * 2014-06-30 2014-09-24 长安大学 Bolted steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure
CN203977277U (en) * 2014-06-30 2014-12-03 长安大学 The antifatigue structure detail of the vertical stiffening rib of steel bridge web gap location

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Address after: Building 303, area 2, No.2 Daliu Road, Haidian District, Beijing 100081

Co-patentee after: CHINA ACADEMY OF RAILWAY SCIENCES Corp.,Ltd.

Patentee after: CARS RAILWAY ENGINEERING Research Institute

Address before: 100081 Beijing city Haidian District Daliushu Road No. 2 district two building 303

Co-patentee before: CHINA ACADEMY OF RAILWAY SCIENCES

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Effective date of registration: 20200717

Address after: Building 303, area 2, No.2 Daliu Road, Haidian District, Beijing 100081

Co-patentee after: CHINA ACADEMY OF RAILWAY SCIENCES Corp.,Ltd.

Patentee after: CARS RAILWAY ENGINEERING Research Institute

Co-patentee after: Beijing Tieche Engineering Testing Co.,Ltd.

Address before: Building 303, area 2, No.2 Daliu Road, Haidian District, Beijing 100081

Co-patentee before: CHINA ACADEMY OF RAILWAY SCIENCES Corp.,Ltd.

Patentee before: CARS RAILWAY ENGINEERING Research Institute