CN110792027A - A bridge variable-height stiffening section structure with grid plate structure and construction method - Google Patents

Abstract

The invention discloses a bridge variable-height stiffening section structure including a grid plate structure. In the variable height stiffening section, there are several longitudinal stiffening ribs distributed along the length of the variable height stiffening section. The longitudinal stiffening ribs are distributed perpendicular to the bottom plate and the bearing plate respectively in the space, and the upper edge of the longitudinal stiffening ribs touches upward. The horizontal grid bars of the grid plate, the vertical stiffeners are distributed at equal intervals at the longitudinal stiffeners, and the vertical stiffeners are distributed vertically in the space, respectively, with the vertical stiffeners and the bottom plate, and the upper ends of the vertical stiffeners are up against the transverse grid bars. . The grid plate is connected with the longitudinal stiffeners, bearing plates and diaphragms, so that the axial force from the standard section of the steel beam is distributed more evenly on the height of the stiffeners, which is beneficial to the force transmission between the bearing plates and the steel compartment.

Description

A bridge variable-height stiffening section structure with grid plate structure and construction method

technical field

The invention relates to the technical field of bridge engineering, in particular to a bridge variable-height stiffening section structure with a grid plate structure, in particular to its mechanical connection structure.

Background technique

Long-span self-anchored suspension bridges mostly use the mixed beam structure of main span steel beams and side span concrete beams. This structural form can not only reduce the weight of the main span and the main beam, but also solve the side span pressure problem, and has large spanning capacity, good mechanical performance and superior economy. Similar to the hybrid girder cable-stayed bridge, the self-anchored suspension bridge of the hybrid girder requires a steel-concrete joint section near the tower to connect the steel girder and the concrete girder. In the steel-concrete joint section, due to the sudden change of section size, the stiffness cannot be smoothly transitioned, and the internal force transmission is not smooth. The steel beam transition section can be used for stiffening to avoid the local force concentration caused by the sudden change of the section. The heightened stiffening height of the transition section of the steel beam is too large, and lateral supports are required to prevent instability. The lateral support of the stiffening section has a large amount of welding and is difficult to operate, and the single welding seam is too short, so the welding quality is not easy to control. Therefore, it is necessary to propose a new structure and construction method for the stiffened section of the steel-concrete combined section of the steel-concrete composite bridge.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a bridge variable-height stiffening section structure with a grid plate structure, so as to achieve a smooth transition of stiffness in the steel-concrete joint section, smooth internal force transmission, reduce the difficulty of welding operations, and improve the construction quality of the variable-height stiffening section. The shortcomings and deficiencies existing in the prior art are overcome.

In order to achieve the above purpose, the technical solution of the present invention is as follows: a bridge variable-height stiffening section structure with a grid plate structure, wherein the variable-height stiffening section is provided with a bottom plate, and grid plates are distributed above the bottom plate, and the above-mentioned grid The plate is composed of cross-distributed transverse grid bars and longitudinal grid bars. One end of the variable height stiffening section is provided with a bearing plate, and the other end of the variable height stiffening section is provided with a transverse partition. The transverse partition and the bearing plate are parallel in space. Distribution, the bearing plate is perpendicular to the bottom plate below, in the variable height stiffening section, there are several longitudinal stiffeners distributed along the length of the variable height stiffening section, and the longitudinal stiffeners are distributed perpendicular to the bottom plate and the bearing plate in space respectively , the upper edge of the longitudinal stiffening rib is up against the transverse grid bars of the grid plate, and vertical stiffening ribs are distributed at equal intervals at the longitudinal stiffening ribs. The upper ends of the ribs bear up against the transverse grid bars.

The present invention discloses a bridge variable-height stiffening section structure including a grid plate structure, and the technical effects are as follows: 1. The present invention adopts a grid plate structure as the lateral support of the longitudinal stiffeners, and the grid plates are factory-made and designed in size. Reasonable and accurate construction positioning. 2. The present invention uses grid plate to replace traditional horizontal support element, reduces welding drop and welding, and is easy to operate, and at the same time, it is beneficial to improve welding quality and improve the fatigue resistance of welding seam. 3. The grid plate of the present invention is connected with the longitudinal stiffening rib, the bearing plate and the diaphragm, so that the axial force transmitted from the standard section of the steel beam is more evenly distributed on the height of the stiffening rib, which is beneficial to the bearing plate and the steel compartment transmission power.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a top view of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

The invention discloses a bridge variable-height stiffening section structure with a grid plate structure, which is different from the prior art in that the variable-height stiffening section 1 is provided with a bottom plate 2, and grid plates 3 are distributed above the bottom plate 2 The above-mentioned grid plate 3 is composed of transverse grid bars 5 and longitudinal grid bars 6 distributed in a crisscross pattern. One end of the variable height stiffening section 1 is provided with a pressure bearing plate 7, and the other end of the variable height stiffening section 1 is provided with a transverse baffle 8. The partition plate 8 and the pressure-bearing plate 7 are distributed in parallel in the space. The pressure-bearing plate 7 is perpendicular to the bottom plate 2 below. In the variable-height stiffening section 1, several longitudinal stiffeners are distributed along the length of the variable-height stiffening section 1. Ribs 9, longitudinal stiffeners 9 are respectively distributed perpendicular to the bottom plate 2 and the bearing plate 6 in the space, the upper edge of the longitudinal stiffeners 9 is up against the transverse grid bars 5 of the grid plate 3, and the longitudinal stiffeners 9 are equally spaced. There are vertical stiffeners 10 , which are distributed vertically to the longitudinal stiffeners 9 and the bottom plate 2 respectively in the space, and the upper ends of the vertical stiffeners 10 press against the transverse grid bars 5 upward.

In the specific implementation, the longitudinal stiffening rib 9 is a variable height rib, and the upper edge of the longitudinal stiffening rib 9 forms an oblique slope, and the slope ratio is 1/5~1/8.

In a specific implementation, the height of the vertical stiffening rib 10 corresponds to the height of the longitudinal stiffening rib 9 at the connection between the two.

In the specific implementation, the grid plate 3 is Q345 steel plate of equal thickness, the thickness of the grid plate 3 is 12-22 mm, and the thickness of the grid plate 3 is less than or equal to the thickness of the longitudinal stiffening ribs 9 .

In the specific implementation, the height of the vertical stiffening rib 10 is twice the thickness of the grid plate 3 lower than the vertical stiffening rib 9, and the thickness of the grid plate 3 is ≥ 8 mm,

In a specific implementation, the width and thickness of the grid plate 3 are 6mm-12mm.

In specific implementation, the grid plate 3 is surrounded by transverse grid bars 5 and longitudinal grid bars 6 to form a plurality of grid holes 11 , and the grid holes 11 are rectangular holes with chamfered corners.

In specific implementation, the side length of the grid hole 11 is ≥350mm, and the radius of the chamfer arc is ≥100mm.

In the specific implementation, the end of the variable-height stiffening section 1 is connected to the constant-height stiffening section, the width of the transverse grid bars 5 and the longitudinal grid bars 6 at the connection point are gradually changed, and the slope ratio of the grid plate 3 at the connection point is 1/12~ 1/20, the width of horizontal grid bars 5 and vertical grid bars 6 is ≥20mm.

In the specific implementation, the construction method of the highly stiffened section structure: the construction method is as follows:

a. Position the longitudinal stiffeners on the bottom plate. After the positioning is completed, the longitudinal stiffeners are respectively welded with the bottom plate, the diaphragm and the bearing plate by double-sided full penetration welding;

b. Position the vertical stiffeners at equal intervals on the longitudinal stiffeners. After the positioning is completed, the vertical stiffeners and the longitudinal stiffeners are welded according to partial penetration welds or fillet welds;

c. Temporarily support the grid plate on the vertical stiffener, and check the position and size;

d. Weld the grid plate with longitudinal stiffeners, bearing plates, and diaphragms. The grid plates are welded with longitudinal stiffeners and pressure plates according to penetration welds, and the grid plates and diaphragms are welded. Side welds are welded as fillet welds.

In specific implementation, the variable-height stiffening sections 1 can be distributed symmetrically up and down, so the bottom plate becomes the top plate, and the variable-height stiffening sections 1 symmetrically distributed up and down are connected up and down through the diaphragm.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to the above-mentioned descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. The utility model provides a bridge that contains grid plate structure becomes high section structure of putting more energy into which characterized in that: the height-variable stiffening section (1) is provided with a bottom plate (2), grid plates (3) are distributed above the bottom plate (2), the grid plates (3) are composed of transverse grid bars (5) and longitudinal grid bars (6) which are distributed in a cross manner, one end of the height-variable stiffening section (1) is provided with a pressure bearing plate (7), the other end of the height-variable stiffening section (1) is provided with a transverse partition plate (8), the transverse partition plate (8) and the pressure bearing plate (7) are distributed in parallel in the space, the pressure bearing plate (7) is perpendicular to the bottom plate (2) below, in the height-variable stiffening section (1), a plurality of longitudinal stiffening ribs (9) are distributed along the length direction of the height-variable stiffening section (1), the longitudinal stiffening ribs (9) are respectively perpendicular to the bottom plate (2) and the pressure bearing plate (6) in the space, the upper edges of the longitudinal stiffening ribs (9) upwards abut against the transverse grid bars (5) of the grid, vertical stiffening ribs (10) are distributed at the positions of the longitudinal stiffening ribs (9) at equal intervals, the vertical stiffening ribs (10) are respectively distributed in the space perpendicular to the longitudinal stiffening ribs (9) and the bottom plate (2), and the upper ends of the vertical stiffening ribs (10) upwards abut against the transverse grid bars (5).

2. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the longitudinal stiffening ribs (9) are height-variable ribs, the upper edges of the longitudinal stiffening ribs (9) form an inclined slope surface, and the slope proportion is 1/5-1/8.

3. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the height of the vertical stiffening rib (10) is correspondingly consistent with the height of the longitudinal stiffening rib (9) at the joint of the vertical stiffening rib and the vertical stiffening rib.

4. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the grating plates (3) are Q345 steel plates with equal thickness, the thickness of the grating plates (3) is 12-22mm, and the thickness of the grating plates (3) is smaller than or equal to that of the longitudinal stiffening ribs (9).

5. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the height of the vertical stiffening ribs (10) is twice of the thickness of the grid plate (3) than that of the longitudinal stiffening ribs (9), and the thickness of the grid plate (3) is more than or equal to 8 mm.

6. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the width and the thickness of the grating plate (3) are 6mm-12 mm.

7. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the grating plates (3) are surrounded by transverse grating strips (5) and longitudinal grating strips (6) to form a plurality of grating holes (11), and the grating holes (11) are rectangular holes with chamfers.

8. The structure of a bridge stiffening section with a grid plate structure of claim 7, wherein: the side length of the grid hole (11) is more than or equal to 350mm, and the radius of the chamfer arc is more than or equal to 100 mm.

9. The structure of a bridge height-variable stiffening section containing a grid plate structure as claimed in claim 1, wherein: the end part of the height-variable stiffening section (1) is connected with the equal-height stiffening section, the width of the transverse grid bars (5) and the width of the longitudinal grid bars (6) at the connection part are gradually changed, the slope proportion of the grid plates (3) at the connection part is 1/12-1/20, and the width of the transverse grid bars (5) and the width of the longitudinal grid bars (6) are more than or equal to 20 mm.

10. A construction method of a bridge variable-height stiffening section structure containing a grid plate structure comprises the following steps: the method is characterized in that: the construction method comprises the following steps:

a. positioning a longitudinal stiffening rib on the bottom plate, and after the positioning is finished, welding the longitudinal stiffening rib with the bottom plate, the diaphragm plate and the pressure-bearing plate respectively according to double-sided full penetration welding;

b. positioning the vertical stiffening ribs on the longitudinal stiffening ribs at equal intervals, and welding the vertical stiffening ribs and the longitudinal stiffening ribs according to partial penetration welding seams or fillet welding seams after the positioning is finished;

c. temporarily supporting the grating plate on the vertical stiffening ribs, and checking the position and the size;

d. and performing girth welding on the grid plate, the longitudinal stiffening rib, the pressure-bearing plate and the transverse partition plate, wherein the grid plate is welded with the longitudinal stiffening rib and the pressure-bearing plate according to penetration welding seams, and the grid plate is welded with the transverse partition plate according to fillet welding seams.

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