Anchor box structure of steel box girder

Abstract

The utility model provides an anchor box structure of a steel box girder. The anchor box structure comprises a bearing plate, an upper supporting plate, a lower supporting plate, a sleeve and at least one internal supporting plate, the bearing plate inclines by a first angle relative to the vertical direction, and the inner side end of the bearing plate is fixed to a web of the steel box girder. The upper supporting plate is located above the lower supporting plate, the first end of the upper supporting plate and the first end of the lower supporting plate are perpendicularly fixed to the first surface of the bearing plate, and the second end of the upper supporting plate and the second end of the lower supporting plate extend upwards and are fixedly connected with the bottom face of a top plate of the steel box girder. The inner side ends of the upper supporting plate and the lower supporting plate are fixed on a web plate of the steel box girder; the first end of the sleeve is perpendicularly fixed to the first surface of the bearing plate and located between the upper supporting plate and the lower supporting plate, and the second end of the sleeve extends upwards by a preset length and is used for installing an inhaul cable. By the aid of the steel box girder web, the problem of local stress of the steel box girder web during anchor box type anchoring can be effectively solved, and safety of a bridge structure is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to a steel box girder anchor box structure. Background Art

[0002] In recent years, hybrid beam low-tower cable-stayed bridges have been widely used in railway construction. Due to the low towers, the horizontal angle of the cable stays in the mid-span steel box beam is also relatively small, but the force is relatively large. The commonly used cable-beam anchoring methods in the prior art mainly include anchor box anchoring, anchor plate anchoring and ear plate anchoring.

[0003] However, when using anchor plate type anchoring and ear plate type anchoring, the bridge deck needs to be widened, which will increase the material consumption of steel box girders and concrete beams, resulting in reduced economic efficiency; and when using anchor box type anchoring, when the cable is subjected to large forces, the web of the steel box girder is subjected to large out-of-plane forces and local stresses due to the eccentric loads transmitted by the cables, thus threatening the safety of the structure. Utility Model Content

[0004] In view of this, the utility model provides a steel box girder anchor box structure, which can effectively solve the problem of local stress on the web of the steel box girder during anchor box type anchoring, and ensure the safety of the bridge structure.

[0005] The technical solution of the utility model is specifically achieved as follows:

[0006] A steel box girder anchor box structure, comprising: a pressure plate, an upper support plate, a lower support plate, a sleeve and at least one internal support plate;

[0007] The pressure bearing plate is inclined at a first angle relative to the vertical direction, and its inner end is fixed to the web of the steel box girder;

[0008] The upper support plate is located above the lower support plate, and the first ends of the upper support plate and the lower support plate are vertically fixed on the first surface of the pressure plate, the second ends of the upper support plate and the lower support plate extend upward and are respectively fixedly connected to the bottom surface of the top plate of the steel box girder, and the inner ends of the upper support plate and the lower support plate are fixed on the web of the steel box girder;

[0009] The first end of the sleeve is vertically fixed on the first surface of the pressure plate and is located between the upper support plate and the lower support plate, and the second end thereof extends upward by a preset length for installing a cable;

[0010] The at least one internal support plate is arranged inside the steel box girder and connected between the webs of the steel box girder, and the positions of the internal support plate and the pressure plate correspond.

[0011] Preferably, the steel box girder anchor box structure further comprises at least one top plate stiffening rib, which is arranged on the top surface of the top plate of the steel box girder and corresponds to the position where the second ends of the upper support plate and the lower support plate are connected to the bottom surface of the top plate.

[0012] Preferably, first stiffening ribs are respectively provided between the upper support plate and the lower support plate and on both sides of the sleeve.

[0013] Preferably, at least one second stiffening rib is fixed on the upper surface of the upper support plate, a first end of the second stiffening rib is fixedly connected to the first surface of the pressure plate, and a second end thereof extends upward along the upper support plate by a preset length.

[0014] Preferably, at least one third stiffening rib is fixed on the lower surface of the lower support plate, a first end of the third stiffening rib is fixedly connected to the first surface of the pressure plate, and a second end thereof extends upward along the lower support plate by a preset length.

[0015] Preferably, an anchor plate is fixed on the second surface of the pressure plate.

[0016] Preferably, the length of the second stiffening rib is shorter than that of the third stiffening rib.

[0017] Preferably, the first stiffening rib is a plate-like structure with a short upper portion and a long lower portion.

[0018] As can be seen above, in the anchor box structure of the steel box girder in the utility model, by tilting the pressure plate relative to the vertical direction at a first angle, the angle between the upper support plate, the lower support plate and the sleeve and the horizontal direction can also be the first angle, thereby meeting the requirement of a smaller horizontal angle of the inclined cable of the steel box girder in the span of the shorter bridge tower. By connecting the second ends of the upper support plate and the lower support plate to the bottom surface of the top plate, the top plate is used to share the force of the web, and an internal support plate is provided inside the steel box girder, the out-of-plane force condition at the position where the pressure plate is fixed on the web can be further improved, and the local force on the web can be alleviated. Therefore, through the above-mentioned arrangement, it is possible to prevent a large out-of-plane bending moment from being generated on the web when the cable force is large, effectively improve the out-of-plane force condition of the web of the steel box girder, reduce the local force on the web, and ensure the safety of the bridge structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an elevation view of the steel box girder anchor box structure in an embodiment of the utility model.

[0020] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0021] Figure 3 for Figure 1 View from the middle BB direction.

[0022] Figure 4 for Figure 1 View from the CC direction.

[0023] Figure 5 for Figure 1 View from the middle DD direction.

[0024] Figure 6 for Figure 1 View from the EE direction. DETAILED DESCRIPTION

[0025] In order to make the technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 6 As shown, the utility model provides a steel box girder anchor box structure, comprising: a pressure plate 1, an upper support plate 31, a lower support plate 32, a sleeve 6 and at least one internal support plate 7;

[0027] The bearing plate 1 is inclined at a first angle α relative to the vertical direction, and its inner end is fixed to the web 100 of the steel box girder;

[0028] The upper support plate 31 is located above the lower support plate 32, and the first ends of the upper support plate 31 and the lower support plate 32 are vertically fixed on the first surface of the pressure plate 1, and the second ends of the upper support plate 31 and the lower support plate 32 extend upward and are respectively fixedly connected to the bottom surface of the top plate 101 of the steel box girder, and the inner side ends of the upper support plate 31 and the lower support plate 32 are fixed on the web 100 of the steel box girder;

[0029] The first end of the sleeve 6 is vertically fixed on the first surface of the pressure plate 1 and is located between the upper support plate 31 and the lower support plate 32, and the second end thereof extends upward by a preset length for installing a cable;

[0030] The at least one internal support plate 7 is arranged inside the steel box girder and connected between the webs 100 of the steel box girder, and the position of the internal support plate 7 corresponds to that of the pressure plate 1 .

[0031] In the technical solution of the utility model, the pressure plate 1 can be tilted at a first angle α relative to the vertical direction according to actual conditions, so that the angle between the upper support plate 31, the lower support plate 32 and the sleeve 6 and the horizontal direction can also be the first angle α, thereby meeting the requirement of a smaller horizontal angle of the inclined cable of the steel box girder in the span of a shorter bridge tower. By connecting the second ends of the upper support plate 31 and the lower support plate 32 to the bottom surface of the top plate, the top plate is used to share the force of the web, and at the same time, an internal support plate 7 is set inside the steel box girder, and the web 100 with the pressure plate 1 fixed on the outer surface of the steel box girder is connected to the inner web inside the steel box girder or the outer web on the other side, and the internal support plate 7 is used to support the web 100 of the steel box girder, so that the out-of-plane force condition at the position where the pressure plate 1 is fixed on the web 100 can be further improved, and the local force on the web 100 can be alleviated. Therefore, through the above-mentioned setting, it is possible to prevent a large out-of-plane bending moment on the web when the cable force is large, effectively improve the out-of-plane stress condition of the web of the steel box girder, reduce the local stress on the web, and ensure the safety of the bridge structure.

[0032] In the technical solution of the utility model, a variety of implementation methods can be used to implement the above-mentioned steel box girder anchor box structure. The following will take one of the implementation methods as an example to introduce the technical solution of the utility model in detail.

[0033] For example, preferably, in a specific embodiment of the present invention, Figure 2 As shown, the steel box girder anchor box structure also includes at least one top plate stiffening rib 8, which is arranged on the top surface of the top plate 101 of the steel box girder and corresponds to the position where the second ends of the upper support plate 31 and the lower support plate 32 are connected to the bottom surface of the top plate.

[0034] In the technical solution of the present invention, by connecting the second ends of the upper support plate 31 and the lower support plate 32 to the bottom surface of the top plate, and adding top plate stiffening ribs 8 at the corresponding position of the top surface of the top plate, the top plate and the stiffening ribs are used to share the force of the web, thereby preventing a large out-of-plane bending moment on the web when the cable force is large, effectively improving the out-of-plane force condition of the web of the steel box girder, reducing the local force of the web, and ensuring the safety of the bridge structure.

[0035] For another example, preferably, in a specific embodiment of the present utility model, Figure 4 and Figure 5 As shown, first stiffening ribs 4 may be provided between the upper support plate 31 and the lower support plate 32, on both sides of the sleeve 6, respectively, so as to improve the integrity and reliability of the upper support plate 31 and the lower support plate 32 and ensure the stability of the anchor box structure.

[0036] In addition, as an example, in a preferred specific embodiment of the present invention, Figure 1 , Figure 4 and Figure 5 As shown, at least one (for example, three) second stiffening ribs 51 may be fixed on the upper surface of the upper support plate 31, the first end of the second stiffening rib 51 is fixedly connected to the first surface of the pressure plate 1, and the second end thereof extends upward along the upper support plate by a preset length.

[0037] In addition, as an example, in a preferred specific embodiment of the present invention, Figure 1 , Figure 4 and Figure 5 As shown, at least one (for example, three) third stiffening ribs 52 may be fixed on the lower surface of the lower support plate 32, the first end of the third stiffening rib 52 is fixedly connected to the first surface of the pressure plate 1, and the second end thereof extends upward along the lower support plate by a preset length.

[0038] In the technical solution of the present utility model, the second stiffening rib and the third stiffening rib are respectively provided on the upper support plate 31 and the lower support plate 32, so that the rigidity and reliability of the anchor box structure can be improved.

[0039] In addition, as an example, in a preferred specific embodiment of the present utility model, as Figure 1 and Figure 6 As shown, an anchor plate 2 is fixed on the second surface of the pressure plate 1 to disperse the transmitted force and enhance the pressure bearing capacity of the pressure plate 1.

[0040] In addition, as an example, in a preferred specific embodiment of the present utility model, as Figure 1 and Figure 6 As shown, the length of the second stiffening rib 51 may be shorter than that of the third stiffening rib 52, so as to be more suitable for adapting to the length of the upper support plate and the lower support plate.

[0041] In addition, as an example, in a preferred specific embodiment of the present utility model, as Figure 1 As shown, in order to adapt to the length of the second stiffening rib 51 and the third stiffening rib 52, the first stiffening rib 4 can be set as an irregular plate-like structure with a short upper portion and a long lower portion.

[0042] Preferably, in a specific embodiment of the present invention, the first angle α can be reasonably designed and determined according to actual needs.

[0043] In summary, in the technical solution of the utility model, by tilting the pressure plate 1 at a first angle α relative to the vertical direction, the angle between the upper support plate 31, the lower support plate 32 and the sleeve 6 and the horizontal direction can also be the first angle α, so that the requirement of a smaller horizontal angle of the inclined cable of the steel box girder in the span of a shorter bridge tower can be met. By connecting the second ends of the upper support plate 31 and the lower support plate 32 to the bottom surface of the top plate, by tilting the pressure plate at a first angle relative to the vertical direction, the angle between the upper support plate, the lower support plate and the sleeve and the horizontal direction can also be the first angle, so that the requirement of a smaller horizontal angle of the inclined cable of the steel box girder in the span of a shorter bridge tower can be met. By connecting the second ends of the upper support plate and the lower support plate to the bottom surface of the top plate, the top plate is used to share the force of the web, and an internal support plate 7 is provided inside the steel box girder, so that the out-of-plane force at the position where the pressure plate is fixed on the web can be further improved, and the local force on the web can be relieved. Therefore, through the above-mentioned setting, it is possible to prevent a large out-of-plane bending moment on the web when the cable force is large, effectively improve the out-of-plane stress condition of the web of the steel box girder, reduce the local stress on the web, and ensure the safety of the bridge structure.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A steel box girder anchor box structure, characterized in that: include: a pressure plate, an upper support plate, a lower support plate, a casing and at least one inner support plate; The pressure bearing plate is inclined at a first angle relative to the vertical direction, and its inner end is fixed to the web of the steel box girder; The upper support plate is located above the lower support plate, and the first ends of the upper support plate and the lower support plate are vertically fixed on the first surface of the pressure plate, the second ends of the upper support plate and the lower support plate extend upward and are respectively fixedly connected to the bottom surface of the top plate of the steel box girder, and the inner ends of the upper support plate and the lower support plate are fixed on the web of the steel box girder; The first end of the sleeve is vertically fixed on the first surface of the pressure plate and is located between the upper support plate and the lower support plate, and the second end thereof extends upward by a preset length for installing a cable; The at least one internal support plate is arranged inside the steel box girder and connected between the webs of the steel box girder, and the position of the internal support plate corresponds to that of the pressure plate.

2. The steel box girder anchor box structure according to claim 1, characterized in that: The steel box girder anchor box structure also includes at least one top plate stiffening rib, which is arranged on the top surface of the top plate of the steel box girder and corresponds to the position where the second ends of the upper support plate and the lower support plate are connected to the bottom surface of the top plate.

3. The steel box girder anchor box structure according to claim 1, characterized in that: First stiffening ribs are respectively arranged between the upper support plate and the lower support plate and on both sides of the sleeve.

4. The steel box girder anchor box structure according to claim 1, characterized in that: At least one second stiffening rib is fixed on the upper surface of the upper support plate, a first end of the second stiffening rib is fixedly connected to the first surface of the pressure plate, and a second end thereof extends upward along the upper support plate by a preset length.

5. The steel box girder anchor box structure according to claim 4, characterized in that: At least one third stiffening rib is fixed on the lower surface of the lower support plate, a first end of the third stiffening rib is fixedly connected to the first surface of the pressure plate, and a second end of the third stiffening rib extends upward along the lower support plate by a preset length.

6. The steel box girder anchor box structure according to claim 1, characterized in that: An anchor plate is fixed on the second surface of the pressure bearing plate.

7. The steel box girder anchor box structure according to claim 5, characterized in that: The length of the second stiffening rib is shorter than the length of the third stiffening rib.

8. The steel box girder anchor box structure according to claim 3, characterized in that: The first stiffening rib is a plate-like structure with a short upper portion and a long lower portion.

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