CN216586112U

CN216586112U - Steel box girder cantilever arm unit

Info

Publication number: CN216586112U
Application number: CN202123313705.3U
Authority: CN
Inventors: 黄会强; 车平; 张峰; 高正稳; 王少刚
Original assignee: China Railway Baoji Bridge Group Co Ltd
Current assignee: China Railway Baoji Bridge Group Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-05-24
Anticipated expiration: 2031-12-27

Abstract

The utility model discloses a steel box girder cantilever arm unit, wherein, the cantilever arm unit comprises a top plate, a clapboard, a closing plate and a bottom plate, the clapboard which is arranged side by side along the bridge is fixed on the back of the top plate by welding, and a plurality of rectangular bulges are arranged on the lower end edge of the clapboard; the bottom plate is provided with a plurality of rectangular through holes which correspond to the rectangular bulges one by one, the rectangular bulges are sleeved in the bottom plate through the rectangular through holes, and the rectangular bulges and the outer side of the bottom plate are welded and fixed, so that the bottom plate is arranged below the top plate; the seal plate is welded and fixed at the outer ends of the top plate, the partition plate and the bottom plate. The utility model discloses a closed sharp mouth type box structure cantilever arm unit, the bottom plate is for leading to long complete board unit to make the windage of whole steel structure bridge reduce.

Description

Cantilever arm unit of steel box girder

Technical Field

The utility model relates to a steel bridge makes technical field, concretely relates to steel box girder cantilever arm unit.

Background

In recent years, with the rapid development of the construction of steel structure bridges, the structural forms of the bridges are diversified, and the steel box girders are increasingly applied to the project of urban viaducts as a structural form of bridges which have light dead weight, attractive appearance and convenient and quick construction. When the steel box girder structure is designed, a cantilever unit is usually designed, the weight and the cost of the cantilever unit can be reduced, the self weight of the steel box girder can be reduced by designing the cantilever unit, and meanwhile, steel and construction cost are saved;

the cantilever arm structure of the steel box girder is a 'sharp-nose' type box structure, the upper part of the cantilever arm structure is an orthotropic plate formed by T-shaped stiffening ribs or plate ribs, the middle of the cantilever arm structure is provided with a cantilever arm clapboard and a side sealing plate, and the lower part of the cantilever arm structure is formed by a cantilever arm bottom plate or thin steel plate-shaped decoration. The traditional cantilever arm unit bottom plate is discontinuous in the longitudinal bridge direction, only a 200-300 mm wide bottom plate is added at the cantilever arm partition plate, and the traditional cantilever arm unit bottom plate belongs to an open structure; in recent years, a closed cantilever design is needed in some areas, so that the overall wind resistance of a steel structure bridge is reduced, in the structure, a bottom plate is a plate unit with complete overall length, a plurality of cantilever partition plates are longitudinally distributed, and after the cantilever partition plates are welded with a cantilever top plate and an edge sealing plate, the bottom plate is assembled, but the cantilever partition plates cannot enter a box to be welded with the cantilever bottom plate due to the narrow space of the cantilever.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a steel box girder outrigger unit.

The to-be-solved technical problem of the utility model is realized through following technical scheme:

the steel box girder cantilever arm unit comprises a top plate, partition plates, a sealing plate and a bottom plate, wherein the partition plates which are arranged side by side along the transverse direction of a bridge are fixedly welded on the back surface of the top plate, and a plurality of rectangular bulges are arranged on the lower end edge of each partition plate; the bottom plate is provided with a plurality of rectangular through holes which correspond to the rectangular bulges one by one, the rectangular bulges are sleeved in the bottom plate through the rectangular through holes, and the rectangular bulges and the outer side of the bottom plate are welded and fixed, so that the bottom plate is arranged below the top plate; the seal plate is welded and fixed at the outer ends of the top plate, the partition plate and the bottom plate.

Furthermore, the back of the top plate is fixedly welded with a U rib and a plate rib which are arranged side by side along the longitudinal direction of the bridge, the partition plate spans the U rib and the plate rib and is fixedly welded with the outer sides of the U rib and the plate rib, the height of the inner end of the partition plate is larger than that of the outer end of the partition plate, and the bottom plate is obliquely arranged below the top plate.

1/2, wherein the length of the rectangular bulge is 400-500 mm, and the height of the rectangular bulge is equal to the thickness of the bottom plate; the distance between adjacent rectangular protrusions is 200-300 mm.

The utility model has the advantages that:

1. the utility model discloses an arm unit is chosen to closed sharp mouth type box structure, the bottom plate is for leading to long complete board unit, thereby make the windage of whole steel construction bridge reduce, certain special area's demand has been satisfied, simultaneously through setting up the rectangle arch on the baffle, and be provided with the rectangle through-hole on the bottom plate position relative with the rectangle arch of baffle, make the bottom plate pass through the rectangle arch with rectangle through-hole welded fastening with the baffle, the unable incasement welded difficult problem of closed sharp mouth type box structure arm unit baffle and bottom plate has been solved.

2. The utility model discloses an each board unit of "flip-chip method" equipment, the equipment order promptly is: the top plate, the partition plate, the sealing plate and the bottom plate are provided with rectangular through holes at intervals through the bottom plate, the partition plate penetrates out locally, and the outside welding of the partition plate and the bottom plate is realized in a plug welding mode outside the box, so that the problem that the partition plate of the cantilever arm unit of the closed sharp-nose box type structure and the bottom plate cannot be welded in the box is solved;

3. the partition plate is partially inserted into the rectangular through hole of the bottom plate, and the plug welding method is adopted, so that the safety, the quality guarantee and the efficiency are high, and the stability and the safety of the arm picking unit are ensured.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic view of a separator;

FIG. 2 is a schematic structural view of a base plate;

fig. 3 is a schematic structural view of the assembled and welded cantilever arm unit.

Description of reference numerals:

1-a top plate; 2-a separator; 3-closing the plate; 4-a bottom plate; 5-U rib; 6-plate ribs; 2-1-rectangular protrusion; 4-1-rectangular through hole.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.

Example 1

The embodiment of the utility model provides a steel box girder cantilever arm unit, as shown in fig. 1 ~ 3, specifically include: the bridge structure comprises a top plate 1, a partition plate 2, a sealing plate 3 and a bottom plate 4, wherein the partition plate 2 which is arranged side by side along the transverse direction of a bridge is fixedly welded on the back surface of the top plate 1, a plurality of rectangular protrusions 2-1 are arranged on the edge of the lower end of the partition plate 2 to form a rectangular tooth-shaped structure, a plurality of rectangular through holes 4-1 which correspond to the rectangular protrusions 2-1 one by one are arranged on the bottom plate 4, the bottom plate 4 is sleeved in the rectangular protrusions 2-1 through the rectangular through holes 4-1, and the rectangular protrusions 2-1 and the outer side of the bottom plate 4 are fixedly welded, so that the bottom plate 4 is arranged below the top plate 1; the sealing plate 3 is welded and fixed at the outer ends of the top plate 1, the partition plate 2 and the bottom plate 4.

Furthermore, a U rib 5 and a plate rib 6 which are arranged side by side along the longitudinal direction of the bridge are welded and fixed on the back surface of the top plate 1, the partition plate 2 spans the U rib 5 and the plate rib 6 and is welded and fixed with the outer sides of the U rib 5 and the plate rib 6, the height of the inner end of the partition plate 2 is greater than that of the outer end, and the bottom plate 4 is obliquely arranged below the top plate 1.

Specifically, the length of the rectangular bulge 2-1 is 400-500 mm, and the height of the rectangular bulge 2-1 is 1/2 of the thickness of the bottom plate 4; the distance between the adjacent rectangular bulges 2-1 is 200-300 mm; the size can ensure the stability of the cantilever unit after welding.

According to the closed type sharp-mouth box-type structure cantilever arm unit, the bottom plate is a plate unit with complete full length, so that the wind resistance of the whole steel structure bridge is reduced, and the requirements of certain special areas are met.

The rectangular protrusions are arranged on the partition plate, and the rectangular through holes are formed in the positions, opposite to the rectangular protrusions, of the bottom plate, so that the bottom plate and the partition plate are welded and fixed through the rectangular protrusions and the rectangular through holes, and the problem that the partition plate of the cantilever unit of the closed sharp-mouth box type structure cannot be welded in a box with the bottom plate is solved.

Example 2

The utility model provides an equipment welding method to embodiment 1's steel case roof beam outrigger unit design specifically includes following step:

step 1: the method comprises the steps of adopting a laser or plasma blanking mode to precisely blank and process a top plate, a partition plate, a bottom plate and a sealing plate according to design data of a construction drawing, cutting a welding groove by flame, simultaneously processing a plurality of rectangular protrusions on the edge of the lower end of the partition plate, and processing a plurality of rectangular through holes in one-to-one correspondence with the rectangular protrusions on the bottom plate.

The bottom plate is obliquely arranged below the top plate, and a plurality of partition plates are arranged in a box body formed by the bottom plate.

Step 2: the method comprises the following steps that a top plate is flatly laid on an assembly jig frame, a plurality of U ribs and plate ribs which are arranged side by side are welded and fixed on the back surface of the top plate side by side along the longitudinal direction of a bridge, the U ribs and the plate ribs face upwards, the upper end of a partition plate stretches across the U ribs and the plate ribs and is welded and fixed with the outer sides of the U ribs and the plate ribs, the perpendicularity of the partition plate and the top plate is ensured, and the partition plate is arranged side by side along the transverse direction of the bridge;

the welding of the U ribs and the plate ribs of the top plate adopts semi-automatic welding trolley welding or portal special machine welding, and the top plate, the U ribs and the plate ribs form a top plate unit.

The partition board is in a right trapezoid shape, and the height of the inner end of the partition board is greater than that of the outer end of the partition board; the rectangular protrusion is positioned on the bevel edge of the right trapezoid, so that the bottom plate is obliquely arranged on the back surface of the top plate.

And step 3: vertically hoisting the bottom plate to enable the bottom plate to be sleeved into the rectangular bulges through the rectangular through holes, fixedly welding the rectangular bulges with the outer side of the bottom plate, and fixing the bottom plate at the lower end of the partition plate;

the size of the rectangular through hole of the bottom plate is slightly larger than that of the rectangular protrusion of the partition plate, the rectangular through hole penetrates through the rectangular protrusion of the partition plate, and the bottom plate and the partition plate are welded and fixed through a plug welding process.

Specifically, when the bottom plate is vertically hoisted, the rectangular bulge of the partition plate is ensured to completely penetrate into the rectangular through hole of the bottom plate, and manual welding positioning is adopted; in addition, in order to prevent deformation, fillet welds between the box inner side partition plate and the bottom plate unit at the box opening are welded firstly, then the welds at the rectangular through holes of all the bottom plate units are plug-welded, and after the defects are detected to be qualified, the weld residual heights at all the rectangular through holes are ground to ensure the flatness of the bottom plate.

When the bottom plate is welded with the partition plate, the space of the cantilever arm is narrow, welding in the box cannot be achieved, the partition plate and the bottom plate need to be specially processed, external plug welding is achieved, integrity of the bottom plate is guaranteed, and therefore the manufactured cantilever arm unit can reduce wind resistance of a bridge.

In example 1 and example 2, the "back surface", "upper end", "lower end", and "outer end" are all the orientations of the respective members when the arm unit is in the normal use state.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The cantilever arm unit of the steel box girder is characterized by comprising a top plate, partition plates, sealing plates and a bottom plate, wherein the partition plates which are arranged side by side along the transverse direction of a bridge are fixedly welded on the back surface of the top plate, and a plurality of rectangular bulges are arranged on the lower end edge of each partition plate; the bottom plate is provided with a plurality of rectangular through holes which correspond to the rectangular bulges one by one, the rectangular bulges are sleeved in the bottom plate through the rectangular through holes, and the rectangular bulges and the outer side of the bottom plate are welded and fixed, so that the bottom plate is arranged below the top plate; the seal plate is welded and fixed at the outer ends of the top plate, the partition plate and the bottom plate.

2. The cantilever unit of the steel box girder according to claim 1, wherein the top plate has U-shaped ribs and plate ribs welded and fixed to a rear surface thereof, the U-shaped ribs and the plate ribs being arranged side by side in a longitudinal direction of the bridge, the partition plate is welded and fixed to outer sides of the U-shaped ribs and the plate ribs, and an inner end of the partition plate has a height greater than an outer end of the partition plate, so that the bottom plate is disposed obliquely below the top plate.

3. The cantilever unit of the steel box girder according to claim 1 or 2, wherein the rectangular protrusion has a length of 400 to 500mm and a height of 1/2 of the thickness of the bottom plate; the distance between adjacent rectangular protrusions is 200-300 mm.