Supporting structure for reducing peripheral stress of notch of diaphragm plate of steel box girder

Abstract

The utility model relates to a supporting structure for reducing the peripheral stress of a notch of a diaphragm plate of a steel box girder, which comprises the diaphragm plate and a steel bridge deck composed of a cover plate and a U-shaped rib, the upper end of the diaphragm plate is provided with a notch according to the outline of the U-shaped rib, and the U-shaped rib penetrates through the notch to be crossed with the diaphragm plate. A notch forming a cavity below the U-shaped rib is formed in the position, located on the lower side of the notch, of the transverse partition plate, the U-shaped rib is provided with a supporting steel plate with the lower portion connected with the transverse partition plate at the position of the transverse partition plate, and the left end and the right end of the upper portion of the supporting steel plate support a web of the U-shaped rib or are supported above the notch. The supporting structure can effectively reduce the notch stress of the steel box girder diaphragm plate and prolong the service life of the diaphragm plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of support structures for reducing the stress of steel box girder diaphragm cutout periphery. BACKGROUND

[0002] Orthotropic steel bridge deck is widely used in modern bridge engineering due to its good mechanical properties and economy. However, this structure is prone to fatigue problems during long-term service, especially under heavy traffic and harsh environmental conditions. Fatigue problems mainly manifest as cracks at specific locations such as welds and cutouts. These cracks will gradually expand, eventually leading to structural failure. Stress concentration at the cutout of the steel bridge deck is particularly severe, making it a high-risk area for fatigue cracks. Therefore, effectively reducing the stress at the cutout of the diaphragm is a key issue for improving the safety and durability of steel box girder structures.

[0003] For new structures, measures to prevent fatigue cracks mainly include improving structural details and manufacturing processes. For example, the fatigue resistance of welds can be improved by adding an inner lining plate, using single-sided full penetration welding, and double-sided welding. Existing methods for repairing fatigue cracks mainly include welding repair, patching plate reinforcement, and local strengthening. Welding repair is the most common method, which restores the continuity of the structure by welding at the crack. However, welding repair has some drawbacks, such as changes in material properties in the heat-affected zone, which can lead to new stress concentration points and trigger new cracks. The patching plate reinforcement method involves adding steel plates around the crack to increase local stiffness and reduce stress concentration. However, this method increases the weight of the structure and is complex to construct, requiring precise positioning and welding techniques. The local strengthening method involves adding reinforcing ribs at the cutout of the diaphragm to improve local bending resistance. However, this strengthening method often requires a large construction space and significantly modifies the original structure, which may affect the overall aesthetics and functionality of the bridge. SUMMARY

[0004] The utility model aims to provide a kind of support structures for reducing the stress of steel box girder diaphragm cutout periphery, which can effectively reduce the stress of steel box girder diaphragm cutout and improve the service life of diaphragm.

[0005] The technical scheme of the utility model is as follows: a kind of support structures for reducing the stress of steel box girder diaphragm cutout periphery, including diaphragm and steel bridge deck composed of cover plate and U-shaped rib, the upper end of the diaphragm is provided with slot according to the contour of U-shaped rib, the U-shaped rib passes through slot and intersects with diaphragm, the lower side of slot on the diaphragm is provided with cutout forming cavity under U-shaped rib, the U-shaped rib is provided with support steel plate connected with diaphragm at lower part at diaphragm, the upper part of support steel plate supports the web of U-shaped rib or supports above cutout at left and right ends.

[0006] Furthermore, the U-shaped ribs continuously pass through the slots of each diaphragm; there are gaps between the left and right sides and the bottom of the cut and the U-shaped ribs.

[0007] Furthermore, the lower surface of the supporting steel plate is in close contact with the surface of the transverse partition located below the cut, and the supporting steel plate and the transverse partition are respectively provided with bolt holes, and the supporting steel plate and the transverse partition are fixed by passing high-strength bolts through the bolt holes.

[0008] Furthermore, the plane of the supporting steel plate is rectangular or trapezoidal, and the upper part of the supporting steel plate is provided with a trapezoidal groove or U-shaped groove for avoiding the U-shaped rib. The trapezoidal groove or U-shaped groove is larger than the outer dimensions of the U-shaped rib.

[0009] Furthermore, the top of the upper left and right ends of the supporting steel plate is provided with a support, and the upper sides of the web of the U-shaped rib or the sides above the cut are provided with fixing blocks, and the support is supported on the lower side of the corresponding fixing block.

[0010] Furthermore, the support consists of a base plate and a baffle, with the baffle forming a groove around the perimeter of the base plate.

[0011] Furthermore, the fixing block is placed in the groove formed by the support, and the internal planar dimension of the groove of the support is larger than the corresponding planar dimension of the fixing block.

[0012] Furthermore, the groove of the support is filled with an epoxy adhesive that provides uniform support to the fixing block.

[0013] Furthermore, the fixing block is a square steel tube, which is adhered to the surface of the diaphragm or the web surface of the U-shaped rib.

[0014] Furthermore, the fixing block is simultaneously adhered to the surface of the diaphragm and the web surface of the U-shaped rib.

[0015] Compared with the prior art, the present invention has the following advantages: the support structure is suitable for fatigue crack repair of the connection details between the steel box girder steel bridge deck and the transverse diaphragm or for the design of new bridges; the support structure is reasonable, easy to construct, and easy to guarantee quality, which can effectively reduce the stress at the cross-section of the steel box girder transverse diaphragm, improve the service life of the transverse diaphragm, and is simple to maintain in the later stage, with good practical value and economic benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the square steel tube adhered to the surface of the transverse diaphragm according to this utility model.

[0017] Figure 2 For the present utility model Figure 1 Side view;

[0018] Figure 3 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model;

[0019] Figure 4 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model; Figure 3 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model;

[0020] Figure 5 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model;

[0021] Figure 6 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model; Figure 5 Structure schematic view of the square steel pipe adhered to the surface of the U rib web of the utility model;

[0022] Figure 7 Front view of the support of the utility model;

[0023] Figure 8 Top view of the support of the utility model;

[0024] Figure 9 Side view of the support of the utility model;

[0025] In the drawing: 1-U rib; 2-supporting steel plate; 3-transverse diaphragm; 4-high-strength bolt; 5-support; 6-fixing block; 7-epoxy adhesive; 8-cover plate; 9-bottom plate; 10-baffle; 11-knife cut; 12-trapezoidal groove or U-shaped groove. DETAILED DESCRIPTION

[0026] In order to make the above features and advantages of the utility model more obvious and easy to understand, the following examples are given, and the detailed description is as follows in combination with the drawings, but the utility model is not limited thereto.

[0027] Example one reference Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9

[0028] A kind of support structure for reducing the stress of cutout periphery of steel box girder transverse diaphragm, including transverse diaphragm 3 and the steel bridge deck panel consisting of cover plate 8 and U rib 1, the upper end of the transverse diaphragm 3 is provided with notch according to the profile of U rib 1, the U rib 1 passes through notch and intersects with transverse diaphragm 3, the lower side of the notch of the transverse diaphragm 3 is provided with cutout 11 forming cavity under U rib 1, the U rib 1 is provided with supporting steel plate 2 connected with transverse diaphragm 3 at lower part at transverse diaphragm 3, the upper part of the supporting steel plate 2 left and right two ends support the web of U rib 1 or support above cutout 11.

[0029] In this embodiment, the lower side of the cover plate 8 is provided with two U-shaped ribs 1 which are integrated with the cover plate 8 and continuously pass through the notches on the transverse plates 3; the left and right sides and the bottom of the cutout 11 have gaps with the U-shaped ribs 1.

[0030] In this embodiment, the lower surface of the support steel plate 2 is tightly attached to the surface of the transverse plate 3 below the cutout 11, bolt holes are provided on the support steel plate 2 and the transverse plate 3 at the corresponding positions, and the support steel plate 2 is fixed to the transverse plate 3 by high-strength bolts 4 passing through the bolt holes.

[0031] In this embodiment, the support steel plate 2 is rectangular or trapezoidal in plan, and a trapezoidal groove or a U-shaped groove 12 is provided on the upper part of the support steel plate 2 to avoid the U-shaped ribs 1, and the outer dimensions of the trapezoidal groove or the U-shaped groove 12 are larger than those of the U-shaped ribs 1.

[0032] In this embodiment, the top of each of the left and right ends of the upper part of the support steel plate 2 is provided with a bracket 5, and the two sides of the top of the web of the U-shaped rib 1 or the two sides above the cutout are provided with fixing blocks 6, and the bracket 5 is supported on the lower side of the corresponding fixing block 6.

[0033] In this embodiment, the bracket 5 is composed of a bottom plate 9 and a baffle 10, and the baffle 10 surrounds the periphery of the bottom plate 9 to form a groove in the bracket 5. The surface of the bracket 5 tightly contacts the surface of the transverse plate 3 and the surface of the web of the U-shaped rib 1, and the notch of the groove tightly contacts the surface of the transverse plate.

[0034] In this embodiment, the fixing block 6 is placed in the groove formed by the bracket 5, and the inner planar dimensions of the groove of the bracket 5 are larger than the planar dimensions of the corresponding fixing block.

[0035] In this embodiment, the groove of the bracket 5 is filled with an epoxy adhesive 7 which uniformly supports the fixing block 6 by the bracket 5.

[0036] In this embodiment, the fixing block 6 is a square steel pipe which is attached to the surface of the transverse plate 3.

[0037] Embodiment Two Reference Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9

[0038] The difference between this embodiment and Embodiment One is that the fixing block 6 does not contact the surface of the transverse plate 3.

[0039] In this embodiment, the fixing block 6 is a square steel pipe which is attached to the surface of the U-shaped rib 1.

[0040] Embodiment Three Reference Figures 5 to 9

[0041] The difference between the embodiment and the embodiments one and two is that the fixing block 6 is pasted on the surface of the transverse partition plate 3 and the surface of the web of the U-shaped rib 1 at the same time, force can be better transmitted, stress is uniformly distributed, and the stress of the transverse partition plate cutout is reduced.

[0042] In the embodiment, the fixing block 6 is a square steel pipe.

[0043] If the utility model discloses or relates to the parts or structural members fixedly connected with each other, then, except for another declaration, fixed connection can be understood as: detachably fixed connection (for example, using bolt or screw connection), and also can be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the fixed connection with each other can also be replaced by an integral structure (for example, integrally formed by using casting process) (except for obviously unable to use integral forming process).

[0044] In addition, in the description of the utility model above, it needs to be understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the patent, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent.

[0045] Any component provided by the utility model can be assembled from a plurality of separate constituent parts, or can be a separate component manufactured by integral forming process.

[0046] The above is only a preferred embodiment of the utility model, and any change and modification made within the scope of the utility model patent application should belong to the coverage range of the utility model.

Claims

1. A support structure for reducing the stress on the perimeter of a cutout in a steel box girder diaphragm, comprising a diaphragm and a steel deck panel consisting of a cover plate and a U-shaped rib, characterized in that, The upper end of the transverse plate is provided with a notch according to the profile of the U-shaped rib, the U-shaped rib crosses the transverse plate through the notch, the lower side of the notch on the transverse plate is provided with a cutout forming a hollow below the U-shaped rib, the U-shaped rib is provided with a support steel plate connected with the transverse plate at the lower part of the transverse plate, the upper part of the support steel plate supports the web of the U-shaped rib or supports above the cutout.

2. The support structure for reducing the stress on the perimeter of a cutout of a steel box girder diaphragm according to claim 1, characterized by, The U-shaped rib continuously crosses the notch of each transverse plate; the left and right sides and the bottom of the cutout have gaps with the U-shaped rib.

3. The support structure for reducing the stress on the perimeter of the cutout of the steel box girder diaphragm according to claim 1, characterized by, The lower surface of the support steel plate is close to the surface of the transverse plate below the cutout, the support steel plate and the transverse plate are provided with bolt holes corresponding to each other, and the high-strength bolts pass through the bolt holes to fix the support steel plate and the transverse plate.

4. The support structure for reducing the stress on the perimeter of a cutout of a steel box girder diaphragm according to claim 1, 2 or 3, characterized by, The plane of the support steel plate is rectangular or trapezoidal, the upper part of the support steel plate is provided with a trapezoidal groove or a U-shaped groove for avoiding the U-shaped rib, and the trapezoidal groove or the U-shaped groove is larger than the outer dimension of the U-shaped rib.

5. The support construction for reducing the stress on the perimeter of a cutout of a steel box girder diaphragm according to claim 1, 2 or 3, characterized in that, The top of the left and right ends of the upper part of the support steel plate is provided with a support, the web of the U-shaped rib is provided with a fixing block on the upper side of the two sides or above the cutout, and the support is supported on the lower side of the corresponding fixing block.

6. The support structure of claim 5, wherein The support is composed of a bottom plate and a baffle, and the baffle forms a groove around the periphery of the bottom plate.

7. The support construction of claim 6, wherein The fixing block is placed in the groove formed by the support, and the internal plane size of the groove of the support is larger than the plane size of the corresponding fixing block.

8. The support structure of claim 6 or 7, wherein The groove of the support is filled with an epoxy adhesive to form uniform support of the fixing block by the support.

9. The support construction of claim 5, wherein The fixing block is a square steel pipe, which is pasted on the surface of the transverse plate or the web surface of the U-shaped rib.

10. The support construction of claim 5, wherein, The fixing block is pasted on the surface of the transverse plate and the web surface of the U-shaped rib at the same time.

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