Fiber concrete box girder with arch in box chamber and bridge with the box girder

Abstract

The present invention discloses a fiber concrete box girder with an arch inside a box chamber and a bridge having the box girder. The fiber concrete box girder includes: a fiber concrete box girder body, including a graphene concrete top plate, a steel fiber concrete bottom plate and two steel fiber concrete webs connecting the top plate and the bottom plate, the bottom plate and the webs are connected as a whole, and the curve form of the whole structure is a parabola or a catenary. The top plate, the bottom plate and the webs form a box chamber; it is characterized in that it also includes: a polypropylene fiber concrete arch structure, which is arranged in the box chamber, the two arch feet of the arch structure are connected to the bottom plate, and the arch top of the arch structure is connected to the lower edge of the top plate. The present invention can significantly increase the lateral stiffness and shear resistance of the structure, greatly improve the ability of the box girder bridge deck with a large lateral span to resist lateral bending moments, greatly enhance the crack resistance of the box girder structure, and have a beautiful appearance.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a box girder and a bridge having the box girder. Background Art

[0002] With the continuous improvement of bridge design and construction technology in my country, bridge structures are evolving towards longer spans, wider decks, and lighter weight. For cantilever and continuous beam bridges with larger spans, a box-shaped cross-section is the most suitable cross-sectional form. Its top and bottom plates often have larger areas to resist positive and negative bending moments. Furthermore, its closed cross-section provides greater torsional stiffness, resulting in more uniform internal force distribution when the bridge is subjected to eccentric loads, and better overall performance.

[0003] Modern transportation is trending towards heavy loads, high speeds, and high volumes, requiring box girders to have a wide transverse width to accommodate growing traffic. However, when the transverse width of the box girder is large, conventional concrete box girder top plates are prone to insufficient transverse stiffness, resulting in significant transverse bending stresses under the effects of deadweight and local vehicle loads. Furthermore, the conventional concrete used in the box girder top and bottom plates is porous and has low tensile strength, inevitably leading to cracks and localized damage during use. Moisture and other harmful substances can penetrate the concrete through these pores and microcracks, causing a range of adverse effects, including strength loss, leakage, carbonization, and reinforcement corrosion. Summary of the Invention

[0004] The main purpose of the present invention is to provide a box girder and a bridge having the box girder to solve the problems of insufficient transverse rigidity, easy cracking and water seepage in the box when the transverse width of the traditional ordinary concrete box section is large.

[0005] In order to solve the technical problem of the present invention, the present invention is achieved through the following technical solutions:

[0006] A fiber concrete box beam with an arch inside a box chamber, comprising:

[0007] The box beam body includes a top plate, a bottom plate and two webs connecting the top plate and the bottom plate, and the top plate, the bottom plate and the webs form a box chamber; the arch structure is arranged in the box chamber, the two arch feet of the arch structure are connected to the bottom plate, and the arch top of the arch structure is connected to the lower edge of the earth top plate.

[0008] Furthermore, the top plate is a graphene concrete top plate, the bottom plate and the web are steel fiber concrete webs, and the arch structure is a polypropylene fiber concrete arch structure.

[0009] Furthermore, the graphene used in the graphene concrete top plate is graphene oxide, and its addition amount is 0.02% of the mass of the cementitious material.

[0010] Furthermore, the arch axis of the arch structure is a parabola or a circular arc, and the upper surface of the arch top of the arch structure is tangent to the lower surface of the top plate and connected to the lower edge of the top plate.

[0011] Furthermore, the steel fiber concrete bottom plate and the steel fiber concrete web plate are connected as a whole, and the outer shape is a parabola or a catenary.

[0012] A bridge comprises one or more fiber concrete box girders with arches inside box chambers, and a plurality of arch structures are continuously arranged along the longitudinal direction of the bridge across the box girders.

[0013] Furthermore, the span of the bridge is greater than 30m, and prestressed carbon fiber cables are arranged in the box.

[0014] Furthermore, the carbon fiber cables are anchored on the top plate or the bottom plate, and steering blocks can be provided inside the box girder to adjust the direction of the carbon fiber cables so as to make the force more reasonable.

[0015] Furthermore, the thickness of the top plate is 25 cm within the span of the bridge, and the thickness of the steel fiber concrete web and bottom plate is 30 cm.

[0016] Beneficial effects:

[0017] 1. The present invention provides a fiber concrete box girder structure with an arch inside a box chamber. The polypropylene fiber concrete arch structure inside the box chamber can provide additional support points for the top plate, effectively improving the lateral bending stiffness of the top plate, and avoiding lateral damage to the box girder top plate with a larger lateral width. At the same time, the presence of the arch structure increases the cross-sectional area of ​​the box girder and improves the shear resistance of the box girder. In particular, compared with other structures, the arch structure can adapt to box chambers of various sizes.

[0018] 2. The top plate is made of graphene concrete, which fully utilizes the advantages of graphene concrete's high compressive and tensile strength and good impermeability, and can effectively reduce the thickness of the top plate and improve its crack resistance.

[0019] 3. Both the web and bottom plates are made of steel fiber concrete, which has the advantages of high shear and compressive strength, can greatly improve the crack resistance of the box girder and reduce its own weight.

[0020] 4. The web and bottom plate are connected as a whole, which can reduce the stress concentration phenomenon of the box girder structure, and the curve is beautiful and has high aesthetic value.

[0021] 5. The polypropylene fiber concrete arch structure added inside the box chamber is a curved form. Compared with other forms, it has a more reasonable stress response, especially when the box beam height is large. Considering the constant load pressure line under the action of the arch structure's own weight and the load transmitted from the top plate, its structure is more stable.

[0022] 6. The bridge consists of multiple arch structures that span the box beams and are continuously arranged along the longitudinal direction of the bridge, which can further improve the overall stability of the bridge structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] This patent is further described below in conjunction with the accompanying drawings.

[0024] Figure 1 This is a three-dimensional schematic diagram of a fiber concrete box beam structure with an arch inside a box chamber according to the present invention.

[0025] Figure 2 This is a schematic cross-sectional view of a fiber concrete box beam structure with an arch inside a box chamber according to the present invention.

[0026] Figure 3 This is a schematic structural diagram of the polypropylene fiber concrete arch structure of the present invention.

[0027] In the figure: 1. Graphene concrete top plate, 2. Steel fiber concrete bottom plate, 3. Steel fiber concrete web plate, 4. Polypropylene fiber concrete arch structure, 41. Arch foot, 42. Arch top. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without making creative efforts are all within the scope of protection of the present invention.

[0029] Please see the attached Figure 1 , an embodiment of the present invention provides a bridge, including multiple box girders.

[0030] The box girder is a fiber reinforced concrete box girder structure with an arch inside a box chamber. It comprises a graphene concrete top plate 1, a steel fiber reinforced concrete bottom plate 2, two symmetrically arranged steel fiber reinforced concrete webs 3, and a polypropylene fiber reinforced concrete arch structure 4. The steel fiber reinforced concrete webs 3 and the steel fiber reinforced concrete bottom plate are connected to form an integral, parabolic curve. The graphene concrete top plate 1 is connected to the top of the steel fiber reinforced concrete webs 3, and the steel fiber reinforced concrete bottom plate 2 is connected to the bottom of the steel fiber reinforced concrete webs 3. The graphene concrete top plate 1, steel fiber reinforced concrete bottom plate 2, and steel fiber reinforced concrete webs 3 form a box chamber. The polypropylene fiber reinforced concrete arch structure 4 is located inside the box chamber formed by the graphene concrete top plate 1, steel fiber reinforced concrete bottom plate 2, and steel fiber reinforced concrete webs 3.

[0031] It can be understood that in other embodiments, the top plate 1 , the bottom plate 2 , the web 3 and the arch structure 4 can be made of other materials.

[0032] Please see the attached Figure 2 and attached Figure 3 The two arch feet 41 of the polypropylene fiber concrete arch structure 4 are connected to the upper edge of the steel fiber concrete bottom plate 2, and the arch top 42 of the polypropylene concrete arch structure 4 is connected to the lower edge of the graphene concrete top plate 1.

[0033] Furthermore, the steel fiber concrete bottom plate 2 and the two steel fiber concrete webs 3 form an integral structure, and the curve form of the integral structure is a parabola or a catenary.

[0034] Furthermore, the arch axis of the polypropylene fiber concrete arch structure 4 is a parabola or a circular arc, the two arch feet 41 of the polypropylene concrete arch structure 4 are connected to the upper edge of the carbon fiber base plate, the upper surface of the arch top 42 of the polypropylene concrete arch structure 4 is tangent to the lower surface of the graphene concrete top plate 1 and is connected to the lower edge of the graphene concrete top plate 1, and the polypropylene fiber concrete arch structure 4 is continuously arranged along the longitudinal direction of the bridge.

[0035] Furthermore, the thickness of the arch ring of the polypropylene fiber concrete arch structure 4 is 25 cm.

[0036] Furthermore, the box girder is used for bridges with a span of 30m~40m.

[0037] Furthermore, the thickness of the graphene concrete top plate 1 is 25 cm within the span of the bridge, the thickness of the steel fiber concrete bottom plate is 30 cm, and the thickness of the steel fiber concrete web 3 is 30 cm, with uniform dimensions.

[0038] Furthermore, the graphene used in the graphene concrete top plate 1 is graphene oxide, and its content is 0.02% of the mass of the cementitious material.

[0039] Furthermore, the bridge includes one or more fiber concrete box girders with arches inside the box chamber, and the box girders are continuously arranged along the longitudinal direction (driving direction) of the bridge by a plurality of arch structures 4 .

[0040] The number of arch structures 4 and box girders can vary, and multiple arch structures 4 can be arranged continuously along the longitudinal direction of the bridge without any gaps between them. The arch structures 4 are arranged across the box girders, that is, multiple box girders are arranged side by side with interconnected box chambers, and the two arch feet 41 of the arch structures 4 are arranged in different box girders.

[0041] Furthermore, if the bridge span is greater than 30m, prestressed carbon fiber cables are arranged in the box girder. The prestressed carbon fiber cables are anchored to the top plate 1 or the bottom plate 2. Steering blocks can be set inside the box girder to adjust the direction of the carbon fiber cables to make the force more reasonable.

[0042] The polypropylene fiber concrete arch structure of the present invention can significantly increase the lateral stiffness and shear resistance of the structure, greatly improving the ability of the box girder bridge deck with a large lateral span to resist lateral damage; the steel fiber concrete bottom plate used in the bottom plate has high tensile strength, which can alleviate the problem of easy cracking of traditional concrete bottom plates and at the same time reduce the deadweight of the bottom plate; the graphene concrete used in the top plate has extremely high compressive strength and water seepage resistance. At the same time, the various fiber concretes used have the advantages of high compressive strength and tensile strength, good density and strong water seepage resistance, which solves the problems of easy cracking and water accumulation in traditional ordinary concrete box girders.

[0043] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fiber reinforced concrete box girder with an arch inside a box chamber, comprising: The box beam body includes a top plate, a bottom plate, and two webs connecting the top plate and the bottom plate, wherein the top plate, the bottom plate, and the webs form a box chamber; It is characterized by further comprising: An arch structure is provided in the box chamber, wherein two arch feet of the arch structure are connected to the bottom plate, and the arch top of the arch structure is connected to the lower edge of the top plate; The top plate is a graphene concrete top plate, the bottom plate is a steel fiber concrete bottom plate, the web plate is a steel fiber concrete web plate, and the arch structure is a polypropylene fiber concrete arch structure; The steel fiber concrete bottom plate and the steel fiber concrete web plate are connected as a whole, and the outer shape is a parabola or a catenary.

2. The fiber reinforced concrete box beam with an arch inside the box chamber according to claim 1, characterized in that: The graphene used in the graphene concrete top plate is graphene oxide, and its addition amount is 0.02% of the mass of the cementitious material.

3. The fiber reinforced concrete box beam with an arch inside the box chamber according to claim 1, characterized in that: The arch axis of the arch structure is a parabola or a circular arc, and the upper surface of the arch top of the arch structure is tangent to the lower surface of the top plate and connected to the lower edge of the top plate.

4. A bridge, characterized in that: The invention comprises one or more fiber concrete box beams with arches inside the box chamber as claimed in claim 1, and the box beams are constructed by cast-in-situ or prefabricated installation.

5. The bridge according to claim 4, characterized in that: The bridge has a span greater than 30m, and prestressed carbon fiber cables are arranged in the box.

6. The bridge according to claim 5, characterized in that: The prestressed carbon fiber cables are anchored on the top plate or the bottom plate, and a steering block is provided in the box beam to adjust the direction of the prestressed carbon fiber cables.

7. The bridge according to claim 4, characterized in that: The thickness of the top plate is 25 cm within the span of the bridge, and the thickness of the web and bottom plates are 30 cm.

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