Steel box girder

Abstract

The utility model relates to the technical field of steel box girders, in particular to a steel box girder which comprises at least one segmented box girder, each segmented box girder comprises a bottom plate, two webs and top plates, the two webs are obliquely arranged on the two sides of the bottom plate, the bottom plate and the two webs form a U shape, and the two top plates are arranged at the tops of the two webs respectively. A plurality of first transverse partition plates are evenly arranged between the bottom plate and the two web plates, and a plurality of first supporting arms are evenly arranged on the outer sides of the web plates and the top plate. The steel box girder is light in dead weight, simple in structure and convenient to construct and weld, meanwhile, the structural strength is guaranteed, the two top plates and the first supporting arms support the bridge deck slab, the contact area between the steel box girder and the bridge deck slab is increased, stability is high, and the steel box girder enables the bridge deck slab to be kept stable all the time.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel box girder technical field, concretely relates to a steel box girder. BACKGROUND

[0002] Steel box girder is also called steel plate box girder, and is a common structural form of large-span bridge. Steel box girder is generally used on bridges with large span, and is called steel box girder because the outer shape looks like a box. As a kind of bridge construction, the bridge body can be divided into multiple sections, and after prefabrication in a factory, the bridge body is transported to the construction site for assembly. The existing steel box girder structure is heavy, complex to construct, time-consuming and labor-intensive, and the insufficient structural strength causes the bridge deck supported thereby to be unstable, which cannot meet the construction requirements of demand bridges. Therefore, there is an urgent need for a steel box girder to solve the above problems. SUMMARY

[0003] In order to solve the technical problems of the existing steel box girder structure being heavy, complex to construct, time-consuming and labor-intensive, and the insufficient structural strength causing the bridge deck supported thereby to be unstable, the utility model provides a steel box girder, the bottom plate, the two webs and the top plate are fixedly connected by welding, and the first transverse web is fixedly connected between the bottom plate and the two webs by welding, and the first support arm is fixedly connected to the outer side of the web and the top plate by welding. The steel box girder is light in weight, simple in structure, convenient for construction and welding, and ensures the structural strength and high stability. The two top plates and the plurality of first support arms support the bridge deck, increase the contact area with the bridge deck, and keep the bridge deck stable at all times.

[0004] The utility model provides a steel box girder, including at least one sectional box girder, sectional box girder includes bottom plate, two webs and top plate, two webs are obliquely arranged on the both sides of bottom plate and bottom plate and two webs form U shape, two top plates are arranged at the top of two webs respectively, bottom plate and two webs between evenly set up with a plurality of first transverse web, the outer side of web and top plate evenly set up with a plurality of first support arm.

[0005] Further, the bottom plate is uniformly provided with a plurality of first bottom plate ribs between the two webs along the width direction thereof, and the bottom plate is uniformly provided with a plurality of second bottom plate ribs between the two webs along the length direction thereof, each second bottom plate rib is fixedly connected with the plurality of first bottom plate ribs and the second bottom plate rib and the first bottom plate rib are crossly arranged, and the two ends of the second bottom plate rib are fixedly connected with the two webs. The first bottom plate rib and the second bottom plate rib are fixedly connected on the bottom plate by welding, and the overall structural strength and stability of the bottom plate are high.

[0006] Further, the top of the left web is lower than the top of the right web, the inner side of the web is provided with a first side plate rib along the height direction thereof, and the inner side of the web is uniformly provided with a plurality of second side plate ribs along the length direction thereof, each of the second side plate ribs is fixedly connected with the first side plate rib and the second side plate rib and the first side plate rib are cross arranged, and the connecting plate is fixedly connected with the first connecting plate and the second bottom plate rib. The first side plate rib and the second side plate rib are fixedly connected on the web by welding, and the overall structural strength and stability of the web is high.

[0007] Further, the two ends of the first transverse partition plate are obliquely provided with first connecting plates, the two ends of the first connecting plate are fixedly connected with the top plate and the second bottom plate rib respectively, and the side of the first connecting plate is fixedly connected with the web; the middle part of the first transverse partition plate is symmetrically provided with two second connecting plates which are obliquely arranged, the bottom of the second connecting plate is provided with a connecting plate, and the connecting plate is fixedly connected with the first connecting plate and the second bottom plate rib. The arrangement of the first transverse partition plate enhances the overall structural strength of the steel box girder.

[0008] Further, the first support arm comprises a support upper arm and a support lower arm, the support upper arm is fixedly connected with the top plate and is obliquely arranged, the support lower arm is fixedly connected with the web and is obliquely arranged, a connecting arm is fixedly connected between the support upper arm and the support lower arm and is fixedly connected with the web, and a plurality of support side plates are uniformly arranged between the connecting arm, the support upper arm and the support lower arm. The first support arm is used for supporting the bridge deck slab placed thereon, so that the bridge deck slab always remains stable.

[0009] Further, a second transverse partition plate is further arranged between the bottom plate and the two webs, the top of the second transverse partition plate is provided with a wing plate, the two ends of the wing plate are fixedly connected with the two top plates respectively, the two sides of the second transverse partition plate are fixedly connected with the two webs respectively, and the bottom of the second transverse partition plate is fixedly connected with the bottom plate and the plurality of first bottom plate ribs. The arrangement of the second transverse partition plate further enhances the overall structural strength of the steel box girder.

[0010] Further, the second transverse partition plate is provided with a manhole, a first reinforcing plate, a plurality of second reinforcing plates and reinforcing plates, the two ends of the first reinforcing plate are fixedly connected with the two webs respectively, the two ends of the second reinforcing plate are fixedly connected with the wing plate and the first reinforcing plate respectively, and the plurality of reinforcing plates are fixedly connected with the two webs respectively. The arrangement of the manhole is convenient for the staff to check the welding condition of the steel box girder.

[0011] Further, the bottom of part of the second transverse partition plate is provided with a reinforcing foot, the reinforcing foot is L-shaped or straight plate-shaped, and the reinforcing foot is fixedly connected with the first bottom plate rib. The reinforcing foot is fixedly connected with the first bottom plate rib, and the second transverse partition plate is further kept stable between the bottom plate and the two webs.

[0012] Further, the outer side of the web plate and the top plate is also uniformly provided with a plurality of second support arms, the second support arms and the first support arms are arranged at intervals, and the length of the second support arms is greater than the length of the first support arms. The two top plates and the plurality of first support arms and the plurality of second support arms support the bridge deck plate, the length of the second support arms is greater than the length of the first support arms, and the contact area with the bridge deck plate is further increased, and the stability is high.

[0013] Further, a plurality of the segmented box girders are provided, and the plurality of segmented box girders are fixedly connected.

[0014] Compared with the prior art, the steel box girder has the following beneficial effects:

[0015] The bottom plate, the two web plates and the top plate are fixedly connected by welding, the first cross partition plate is fixedly connected between the bottom plate and the two web plates by welding, and the first support arm is fixedly connected to the outer side of the web plate and the top plate by welding. The steel box girder is light in self weight, simple in structure and convenient for construction welding, while the structural strength is ensured. The two top plates and the plurality of first support arms support the bridge deck plate, the contact area with the bridge deck plate is increased, the stability is high, and the steel box girder supports the bridge deck plate placed thereon, so that the bridge deck plate is always kept stable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a top view structural schematic diagram of a steel box girder of the utility model;

[0017] Fig. 2 is a side view structural schematic diagram of a steel box girder of the utility model;

[0018] Fig. 3 is a structural schematic diagram of a bottom plate and a first cross partition plate of the utility model;

[0019] Fig. 4 is a structural schematic diagram of a web plate of the utility model;

[0020] Fig. 5 is a structural schematic diagram of a first support arm of the utility model;

[0021] Fig. 6 is a structural schematic diagram of a second cross partition plate of the utility model;

[0022] In the drawings, the reference signs are:

[0023] 1, bottom plate; 11, first bottom plate rib; 12, second bottom plate rib;

[0024] 2, web plate; 21, first side plate rib; 22, second side plate rib;

[0025] 3, top plate;

[0026] 4. first cross partition plate; 41. first connecting plate; 42. second connecting plate; 43. connecting piece;

[0027] 5. first support arm; 51. support upper arm; 52. support lower arm; 53. connecting arm; 54. support side plate;

[0028] 6. second cross partition plate; 61. wing plate; 62. manhole; 63. first reinforcing plate; 64. second reinforcing plate; 65. reinforcing piece; 66. reinforcing foot; 7. second support arm. DETAILED DESCRIPTION

[0029] The utility model is further explained in connection with the drawings and specific embodiments below.

[0030] As Figs. 1-6 shown in the figure, a steel box girder comprises at least one segmented box girder, the segmented box girder comprises a bottom plate 1, two web plates 2 and top plates 3, the two web plates 2 are obliquely arranged on the two sides of the bottom plate 1 and the bottom plate 1 and the two web plates 2 form a U shape, and the two top plates 3 are arranged on the top of the two web plates 2 respectively; a plurality of first cross partition plates 4 are evenly arranged between the bottom plate 1 and the two web plates 2, and a plurality of first support arms 5 are evenly arranged on the outer side of the web plate 2 and the top plate 3. In this embodiment, the width of the bottom plate 1 is 6.6 m; the width of the top plate 3 ranges from 1.4 m to 1.9 m. The bottom plate 1 and the top plate 3 are made of Q420qD steel material. The web plate 2, the first cross partition plate 4 and the first support arm 5 are made of Q345qD steel material.

[0031] The steel box girder of this embodiment is installed on a pier, specifically, the at least one segmented box girder is located on a plurality of piers, the segmented box girder is used to support the bridge deck slab placed thereon, so that the bridge deck slab always remains stable, and the width of the bridge deck slab is greater than the width of the steel box girder.

[0032] The bottom plate 1, the two web plates 2 and the top plates 3 in this embodiment are fixedly connected by welding, the first cross partition plates 4 are fixedly connected between the bottom plate 1 and the two web plates 2 by welding, and the first support arms 5 are fixedly connected on the outer side of the web plate 2 and the top plate 3 by welding. The steel box girder has light self weight, simple structure and is convenient for construction and welding, while the structural strength is ensured. The two top plates 3 and the plurality of first support arms 5 support the bridge deck slab, increase the contact area with the bridge deck slab, have high stability, and make the bridge deck slab always remain stable when the steel box girder supports the bridge deck slab placed thereon.

[0033] As an implementable mode, the bottom plate 1 is uniformly provided with a plurality of first bottom plate ribs 11 between the two webs 2 along the width direction of the bottom plate 1, wherein the length of the first bottom plate rib 11 is less than the length of the bottom plate 1, facilitating welding of the first bottom plate rib 11, and the bottom plate 1 is uniformly provided with a plurality of second bottom plate ribs 12 between the two webs 2 along the length direction of the bottom plate 1, the middle part of each second bottom plate rib 12 is fixedly connected with the plurality of first bottom plate ribs 11 and the second bottom plate rib 12 and the first bottom plate rib 11 are cross arranged, and the two ends of the second bottom plate rib 12 are fixedly connected with the two webs 2 respectively. The first bottom plate rib 11 and the second bottom plate rib 12 are fixedly connected on the bottom plate 1 by welding, and the overall structural strength and stability of the bottom plate 1 is high. The cross arrangement of the second bottom plate rib 12 and the first bottom plate rib 11 makes the overall structure of the bottom plate 1 more simple, while saving the occupied space.

[0034] Preferably, a plurality of first notches are uniformly arranged on each second bottom plate rib 12, and part of the first bottom plate rib 11 is clamped at the first notch, and part of the first bottom plate rib 11 is fixedly welded at the first notch of the second bottom plate rib 12.

[0035] As an implementable mode, the top of the web 2 on the left side is lower than the top of the web 2 on the right side, that is, the tops of the two webs 2 are high and low, so that the tops of the two webs 2 are high and low, and the plurality of first support arms 5 on both sides of the bottom plate are partially located at the high position and the remaining part is located at the low position, which is to ensure drainage. When the two tops 3 and the plurality of first support arms 5 support the bridge deck, it is convenient for the bridge deck to drain water, and the inner side of the web 2 is provided with a first side plate rib 21 along the height direction of the web 2, wherein the length of the first side plate rib 21 is less than the length of the web 2, and the inner side of the web 2 is uniformly provided with a plurality of second side plate ribs 22 along the length direction of the web 2, each second side plate rib 22 is fixedly connected with the first side plate rib 21 by welding and the second side plate rib 22 and the first side plate rib 21 are cross arranged, and the two ends of the second side plate rib 22 are fixedly connected with the top plate 3 and the bottom plate 1 by welding, wherein the bottom of the second side plate rib 22 is L-shaped. The first side plate rib 21 and the second side plate rib 22 are fixedly connected on the web 2 by welding, and the overall structural strength and stability of the web 2 is high. The cross arrangement of the first side plate rib 21 and the second side plate rib 22 makes the overall structure of the web 2 more simple, while saving the occupied space. In the embodiment, the second side plate rib 22 is arranged every 4m.

[0036] Preferably, the second side plate rib 22 is provided with a second notch, part of the first side plate rib 21 is clamped at the second notch, and part of the first side plate rib 21 is fixedly welded at the second notch of the second side plate rib 22.

[0037] As an implementable mode, in the embodiment, the first cross partition plates 4 are arranged at intervals of 4 meters, the second side plate ribs 22 are arranged at intervals of 4 meters, and some of the first cross partition plates 4 and the second side plate ribs 22 are arranged at intervals. The remaining second side plate ribs 22 are evenly arranged and located between two first cross partition plates 4.

[0038] As an implementable mode, the first cross partition plate 4 is provided with a first connecting plate 41 at both ends, the two ends of the first connecting plate 41 are fixedly connected with the top plate 3 and the second bottom plate rib 12 respectively, and the side of the first connecting plate 41 is fixedly connected with the web plate 2 by welding. The middle part of the first cross partition plate 4 is provided with two second connecting plates 42 which are symmetrically arranged and obliquely arranged, the bottom of the second connecting plate 42 is provided with a connecting piece 43, and the connecting piece 43 is fixedly connected with the first connecting plate 41 and the second bottom plate rib 12 by welding. The first cross partition plate 4, the first connecting plate 41, the second connecting plate 42 and the connecting piece 43 are fixedly connected by welding. The first cross partition plate 4 is fixed between the bottom plate 1 and the two web plates 2 through the first connecting plate 41 and the connecting piece 43. The arrangement of the first cross partition plate 4 enhances the structural strength of the whole steel box girder.

[0039] As an implementable mode, the first support arm 5 includes a support upper arm 51 and a support lower arm 52, the support upper arm 51 is fixedly connected with the top plate 3 by welding and is obliquely arranged, the support lower arm 52 is fixedly connected with the web plate 2 by welding and is obliquely arranged, and a connecting arm 53 is fixedly connected between the support upper arm 51 and the support lower arm 52, wherein the connecting arm 53 is also fixedly connected with the web plate 2 by welding, and a plurality of support side plates 54 are evenly arranged between the connecting arm 53, the support upper arm 51 and the support lower arm 52. The support upper arm 51, the support lower arm 52, the connecting arm 53 and the plurality of support side plates 54 are fixedly connected by welding. The first support arm 5 is also used to support the bridge deck slab placed thereon, so that the bridge deck slab can always remain stable. Generally, the width of the cross section of the bridge deck slab is greater than that of the steel box girder, and the arrangement of the first support arm 5 can further stabilize the bridge deck slab.

[0040] As an implementable mode, the second transverse plate 6 is further arranged between the bottom plate 1 and the two webs 2, the top of the second transverse plate 6 is provided with a wing plate 61, the two ends of the wing plate 61 are respectively fixedly connected with the two top plates 3 through welding, the two sides of the second transverse plate 6 are respectively fixedly connected with the two webs 2 through welding, and the bottom of the second transverse plate 6 is fixedly connected with the bottom plate 1 and the plurality of first bottom plate ribs 11 through welding. The second transverse plate 6 and the wing plate 61 are fixed between the bottom plate 1 and the two webs 2 through welding. When the steel box girder is installed on the pier, a plurality of segmented box girders are located between a plurality of piers, and the second transverse plate 6 is arranged on a segmented box girder corresponding to the pier. The second transverse plate 6 is arranged, and the structural strength of the steel box girder as a whole is further enhanced.

[0041] As an implementable mode, the second transverse plate 6 is further arranged between the bottom plate 1 and the two webs 2, the top of the second transverse plate 6 is provided with a wing plate 61, the two ends of the wing plate 61 are respectively fixedly connected with the two top plates 3 through welding, the two sides of the second transverse plate 6 are respectively fixedly connected with the two webs 2 through welding, and the bottom of the second transverse plate 6 is fixedly connected with the bottom plate 1 and the plurality of first bottom plate ribs 11 through welding. The second transverse plate 6 and the wing plate 61 are fixed between the bottom plate 1 and the two webs 2 through welding. When the steel box girder is installed on the pier, a plurality of segmented box girders are located between a plurality of piers, and the second transverse plate 6 is arranged on a segmented box girder corresponding to the pier. The second transverse plate 6 is arranged, and the structural strength of the steel box girder as a whole is further enhanced.

[0042] Further, the manhole 62 is located at the central position of the middle part of the second transverse plate 6, the first reinforcing plate 63 and the plurality of reinforcing pieces 65 are located on the upper and lower sides of the manhole 62, the plurality of second reinforcing plates 64 are uniformly distributed along the length direction of the second transverse plate 6, and the plurality of second reinforcing plates 64 are uniformly distributed on the left and right sides of the manhole 62.

[0043] Preferably, the bottom of the second transverse plate 6 is uniformly provided with a plurality of third clamping holes, and part of the first bottom plate rib 11 is clamped at the third clamping hole and welded and fixed at the third clamping hole of the second transverse plate 6.

[0044] As an implementable mode, part of the bottom of the second transverse plate 6 is provided with a reinforcing foot 66, and the reinforcing foot 66 is fixedly connected with the first bottom plate rib 11 through welding. The second transverse plate 6 and the reinforcing foot 66 can be integrally formed. The reinforcing foot 66 is fixedly connected with the first bottom plate rib 11, so that the second transverse plate 6 is further stabilized between the bottom plate 1 and the two webs 2. Further, the reinforcing foot 66 is in L shape or straight plate shape.

[0045] As an implementable mode, the outer side of the web plate 2 and the top plate 3 is also uniformly provided with a plurality of second support arms 7, the second support arms 7 and the first support arms 5 are arranged at intervals, the structure of the second support arms 7 is the same as that of the first support arms 5, and here will not be described too much, the length of the second support arms 7 is greater than that of the first support arms 5. The two top plates 3 and the plurality of first support arms 5 and the plurality of second support arms 7 support the bridge deck slab, the length of the second support arms 7 is greater than that of the first support arms 5, further increasing the contact area with the bridge deck slab, the stability is high, and the steel box girder supports the bridge deck slab placed thereon, so that the bridge deck slab is always kept stable.

[0046] As an implementable mode, the segmented box girder is provided with a plurality of segmented box girders, and the plurality of segmented box girders are fixedly connected. According to requirements, the plurality of segmented box girders are welded and fixed. Specifically, the bottom plate 1, the top plate 3 and the web plate 2 of the plurality of segmented box girders are fixedly connected.

[0047] The above-mentioned embodiments are only preferred embodiments of the present application, and are only used to explain the present application, and are not intended to limit the scope of the present application. For those skilled in the art, of course, other embodiments can be easily made by substitution or change according to the technical content disclosed in the present application, therefore, any changes and improvements made on the basis of the principles and process conditions of the present application shall be included in the scope of the patent application of the present application.

Claims

1. A steel box girder characterized by, The utility model provides a box girder, which comprises a bottom plate (1), two web plates (2) and a top plate (3), the two web plates (2) are obliquely arranged on both sides of the bottom plate (1), the bottom plate (1) and the two web plates (2) form a U shape, and the two top plates (3) are arranged on the top of the two web plates (2) respectively.

2. The steel box girder according to claim 1, characterized in that, The bottom plate (1) is uniformly provided with a plurality of first bottom plate ribs (11) between the two web plates (2) along the width direction of the bottom plate (1), the bottom plate (1) is uniformly provided with a plurality of second bottom plate ribs (12) between the two web plates (2) along the length direction of the bottom plate (1), each second bottom plate rib (12) is fixedly connected with the first bottom plate ribs (11) and the second bottom plate rib (12) and the first bottom plate rib (11) are cross arranged, and the two ends of the second bottom plate rib (12) are fixedly connected with the two web plates (2) respectively.

3. The steel box girder according to claim 2, wherein The top of the web plate (2) on the left side is lower than the top of the web plate (2) on the right side, the inner side of the web plate (2) is provided with a first side plate rib (21) along the height direction of the web plate (2), and the inner side of the web plate (2) is uniformly provided with a plurality of second side plate ribs (22) along the length direction of the web plate (2), each second side plate rib (22) is fixedly connected with the first side plate rib (21) and the second side plate rib (22) and the first side plate rib (21) are cross arranged, and the two ends of the second side plate rib (22) are fixedly connected with the top plate (3) and the bottom plate (1) respectively.

4. The steel box girder according to claim 2, wherein The two ends of the first cross partition plate (4) are obliquely provided with first connecting plates (41), the two ends of the first connecting plate (41) are fixedly connected with the top plate (3) and the second bottom plate rib (12) respectively, and the side of the first connecting plate (41) is fixedly connected with the web plate (2); the middle part of the first cross partition plate (4) is symmetrically provided with two second connecting plates (42) which are obliquely arranged, the bottom of the second connecting plate (42) is provided with a connecting sheet (43), and the connecting sheet (43) is fixedly connected with the first connecting plate (41) and the second bottom plate rib (12).

5. The steel box girder according to claim 2, wherein The first support arm (5) comprises a support upper arm (51) and a support lower arm (52), the support upper arm (51) is fixedly connected with the top plate (3) and is obliquely arranged, the support lower arm (52) is fixedly connected with the web plate (2) and is obliquely arranged, a connecting arm (53) is fixedly connected between the support upper arm (51) and the support lower arm (52) and is fixedly connected with the web plate (2), and a plurality of support side plates (54) are uniformly arranged between the connecting arm (53), the support upper arm (51) and the support lower arm (52).

6. The steel box girder according to claim 2, wherein The second transverse partition plate (6) is provided with a manhole (62), a first reinforcing plate (63), a plurality of second reinforcing plates (64) and a reinforcing sheet (65).

7. The steel box girder according to claim 6, characterized in that, Part of the bottom of the second transverse partition plate (6) is provided with a reinforcing foot (66), which is L-shaped or straight plate-shaped, and is fixedly connected with the first bottom plate rib (11).

8. The steel box girder according to claim 6, wherein The outer sides of the web plate (2) and the top plate (3) are also uniformly provided with a plurality of second support arms (7), which are arranged at intervals with the first support arms (5), and the length of the second support arms (7) is greater than that of the first support arms (5).

9. The steel box girder of claim 1, wherein, The segmented box girder is provided with a plurality of segmented box girders which are fixedly connected.

10. The steel box girder of claim 1, wherein, ​

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