CN111519526A

CN111519526A - Bridge deck stiffening structure and welding method

Info

Publication number: CN111519526A
Application number: CN202010365301.XA
Authority: CN
Inventors: 蒋克文; 杨军; 周全望; 刘弘金; 李嘉欣; 陈洁; 李巧娅; 禹金杞
Original assignee: Yunnan Kunsteel Steel Structure Co ltd
Current assignee: Yunnan Kunsteel Steel Structure Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-08-11

Abstract

The invention relates to a bridge plate surface stiffening structure and a welding method, which comprises a plurality of U-rib stiffening plates arranged on a bridge plate surface, wherein a single-side groove is formed at the joint part of the U-rib stiffening plates and the bridge plate surface, the truncated edge is 0.5-2 mm, and the gap is 2.5-3 mm. By the method, the purpose that the penetration rate of the welding seam is more than 80% is realized on the premise that the thickness of the U rib plate reaches 10 mm.

Description

Bridge deck stiffening structure and welding method

Technical Field

The invention relates to the field of welding processes, in particular to a bridge deck stiffening structure and a welding method.

Background

At present, submerged arc welding is mostly adopted in the related technology of welding U ribs in a workshop, a large-scale company has special equipment which is produced independently after accepting projects, the special equipment is used for specially welding large-batch U rib bridges, a general machine is heavy, the starting cost is high, manual welding can be used only when a small amount of projects and sporadic projects occur, and therefore quality is unstable, and the processing period is long. The process uses two light-duty arc-focusing pulse gas shielded welding machines, can simply and quickly complete the welding of the U rib under the correct process parameters, and ensures the penetration rate.

Disclosure of Invention

In order to solve the above problems, the present invention aims to provide a stiffening structure for a bridge deck and a welding method thereof, which have high weld penetration rate.

The invention is realized by the following steps and process parameters:

the utility model provides a bridge plate face stiffening structure, is including locating a plurality of U rib stiffening plates on the bridge plate face, and U rib stiffening plate and bridge plate face meet the position and open the single face groove, and truncated edge 0.5 ~ 2mm, clearance 2.5 ~ 3 mm.

Further, the single-sided bevel angle was 25 °.

Further, when the connection is lengthened, the misalignment at the butt joint of the front U rib stiffening plate and the rear U rib stiffening plate is not more than 10% of the plate thickness and not more than 3 mm.

Furthermore, during machining, grooves are formed in the U-rib stiffening plates, the angle is 30 degrees, no truncated edge exists, and the assembling clearance between the U-rib stiffening plates and the bottom plate is less than or equal to 2 mm.

The invention also relates to a method for welding the stiffening structure of the bridge deck, which comprises the following steps:

step (1), blanking and manufacturing a U-rib stiffening plate according to design requirements;

step (2), correctly assembling the U rib stiffening plates to the position of a designated bridge deck according to design requirements;

step (3), adopting the previous arc-focusing pulse gas shield welding machine for backing welding, and simultaneously adopting the next arc-focusing pulse gas shield welding machine for carrying out cover surface welding on a rear butt welding seam;

step (4), inspecting and detecting a welded finished product;

and (5) coating and hoisting the finished product, and finishing the finished product leaving the factory.

Furthermore, in the welding process, the U rib stiffening plate and the bridge plate face are connected with a single-side groove, the angle is 25 degrees, the truncated edge is 0.5-2 mm, the gap is 2.5-3 mm, and fusion penetration is ensured.

Furthermore, in the welding process, when the welding is lengthened, the misalignment amount of the butt joint of the front U rib stiffening plate and the rear U rib stiffening plate is not more than 10% of the plate thickness and not more than 3 mm.

Furthermore, in the bottoming welding process, the welding wire and the U rib stiffening plate form an angle of 35 degrees and an angle of 55 degrees with the bottom plate; in the process of welding the cover surface, the welding wire forms an angle of 35 degrees with the U rib stiffening plate and an angle of 55 degrees with the bottom plate.

Furthermore, in the welding process, the distance between the cover surface welding step of the latter arc-focusing pulse gas shield welding machine and the welding position of the former backing welding is preferably controlled to be 100-110 mm.

Compared with the prior art, the process has the following advantages:

the invention uses two light-duty arc-focusing pulse gas shielded welding machines, can simply and quickly complete the welding of the U rib under the correct technological parameters, ensures the penetration rate, and has the advantages that the penetration rate of the welding line with the plate thickness of less than 10mm is more than 80 percent, low operation cost, high efficiency and good quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some operation examples of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a bridge deck stiffening structure according to the present invention;

fig. 2 is a sectional view of fig. 1 through 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of examples of the present invention, and not all examples. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, the stiffening structure for a bridge deck of the present embodiment includes 2U-rib stiffening plates 2 disposed on a bridge deck 1, and may also include 3U-rib stiffening plates, where the U-rib stiffening plates 2 and the bridge deck are in face-to-face contact with each other to form a single-sided groove, a truncated edge is 0.5 to 2mm, and a gap is 2.5 to 3 mm. As shown in fig. 2, the single-sided bevel angle was 25 °. When the connection is lengthened, the misalignment at the joint of the front U rib stiffening plate and the rear U rib is not more than 10% of the plate thickness and not more than 3 mm.

The embodiment also relates to a bridge deck stiffening structure welding method, which comprises the following steps:

step (1), blanking and manufacturing U ribs according to design requirements; and (3) forming a groove according to a welding process evaluation instruction, wherein the angle is 30 degrees, no truncated edge exists, and the assembly clearance between the U rib and the bottom plate is less than or equal to 2 mm.

Step (2), correctly assembling the U ribs to the position of the appointed bridge deck according to the design requirement; before the U-shaped rib and the top plate assembly, the surfaces of the grooves and the base materials (front and back surfaces) are cleaned up by oil, paint, dirt, rust and the like until the metal luster is generated.

in the welding process, the U-rib stiffening plate and the U-rib stiffening plate are butted with a single-side groove, the angle is 25 degrees, the truncated edge is 0.5-2 mm, the gap is 2.5-3 mm, and the penetration is ensured. When the welding is lengthened, the misalignment of the butt joint of the front U rib stiffening plate and the rear U rib stiffening plate is not more than 10% of the plate thickness and not more than 3 mm. In the bottoming welding process, the welding wire and the U rib form an angle of 35 degrees and an angle of 55 degrees with the bottom plate; in the process of welding the cover surface, the welding wire forms an angle of 35 degrees with the U rib and an angle of 55 degrees with the bottom plate. In the welding process, the distance between the cover surface welding step of the next arc-focusing pulse gas shield welding machine and the welding position of the backing welding in the previous step is preferably controlled to be 100-110 mm.

Step (4), inspecting and detecting a welded finished product;

Experiments show that the penetration rate of a weld joint with the thickness of less than 10mm is more than 80% on the premise that the thickness of the U-shaped rib plate reaches 10mm, and the penetration rate is guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A bridge deck stiffening structure is characterized in that: the bridge plate comprises a plurality of U-rib stiffening plates arranged on a bridge plate surface, wherein single-side grooves are formed in the joint positions of the U-rib stiffening plates and the bridge plate surface, the truncated edges are 0.5-2 mm, and the gaps are 2.5-3 mm.

2. A deck-stiffener structure according to claim 1, wherein: the single-face bevel angle is 25 degrees.

3. A deck-stiffener structure according to claim 1, wherein: when the connection is lengthened, the misalignment at the joint of the front U rib stiffening plate and the rear U rib stiffening plate is not more than 10% of the plate thickness and not more than 3 mm.

4. A deck-stiffener structure according to claim 1, wherein: during machining, the U-rib stiffening plate is provided with a groove, the angle is 30 degrees, no truncated edge exists, and the assembly clearance between the U-rib stiffening plate and the bottom plate is less than or equal to 2 mm.

5. A method for welding a stiffening structure on a bridge deck is characterized by comprising the following steps: the method comprises the following steps:

step (4), inspecting and detecting a welded finished product;

6. A bridge deck stiffening structure welding method according to claim 5, characterized in that: the U rib stiffening plate is provided with a groove, the angle is 30 degrees, no truncated edge exists, and the assembly gap between the U rib stiffening plate and the bottom plate is less than or equal to 2 mm.

7. A bridge deck stiffening structure welding method according to claim 5, characterized in that: in the welding process, a single-side groove is formed in the joint position of the U-rib stiffening plate and the bridge plate surface, the angle is 25 degrees, the truncated edge is 0.5-2 mm, the gap is 2.5-3 mm, and fusion penetration is ensured.

8. A bridge deck stiffening structure welding method according to claim 5, characterized in that: in the welding process, when the welding is lengthened, the misalignment at the butt joint of the front U rib stiffening plate and the rear U rib stiffening plate is not more than 10% of the plate thickness and not more than 3 mm.

9. A bridge deck stiffening structure welding method according to claim 5, characterized in that: in the bottoming welding process, the welding wire and the U rib stiffening plate form an angle of 35 degrees and an angle of 55 degrees with the bottom plate; in the process of welding the cover surface, the welding wire forms an angle of 35 degrees with the U rib stiffening plate and an angle of 55 degrees with the bottom plate.

10. A bridge deck stiffening structure welding method according to claim 5, characterized in that: in the welding process, the distance between the cover surface welding step of the next arc-focusing pulse gas shield welding machine and the welding position of the backing welding in the previous step is controlled to be 100-110 mm.