A large-span underground structure with a hollow box-shaped steel reinforced concrete beam and slab and its manufacturing method

Abstract

The present invention provides a large-span underground structure of a hollow box-shaped steel reinforced concrete beam and slab and a manufacturing method thereof. The hollow box-shaped steel reinforced concrete beam and slab includes a concrete beam, a concrete slab, a hollow steel plate box, shear studs and steel bars. The hollow steel plate box is arranged in the concrete beam and the concrete slab, making the concrete beam and the concrete slab in a hollow structure. The shear studs are welded on the outer surface of the hollow steel plate box in the concrete beam, used for the connection between the hollow steel plate box and the concrete beam and for transmitting shear force. The steel bars are arranged in the concrete beam and the concrete slab and have no contact with the hollow steel plate box and the shear studs. This hollow box-shaped steel reinforced concrete beam and slab structure can effectively reduce the self-weight, reduce the consumption of concrete and steel bars, decrease the cross-sectional dimensions of the beam and slab, improve the structural bearing capacity, enhance the building use space, and can be widely applied to building structures, bridge structures and other engineering structures, especially suitable for large-span underground structures with the characteristics of large loads.

Description

Technical Field

[0001] The present invention relates to the field of structural engineering, and particularly to a new large-span underground structure hollow box-shaped steel reinforced concrete beam and slab and a manufacturing method thereof. Background Art

[0002] In recent years, the modernization level in China has been gradually improving, and the demand for urban space capacity has been expanding rapidly, resulting in increasingly tight urban land resources. Therefore, it is imperative to increase the development and utilization of underground space. With the continuous increase in the volume of underground structures and the increasingly complex load actions, the traditional underground structure forms can no longer meet the requirements of current underground space development. To adapt to the trend of modern underground space development towards large spans, multi-functions, and three-dimensional intersections, it is necessary to strengthen the research on new forms of underground building structures under large-span (span greater than 20m) conditions to ensure the long-term safety and stability requirements of large-span structures during construction and service, while reducing costs, improving production efficiency, and striving to achieve the best benefits with limited resources.

[0003] The existing beam and slab forms are mostly solid reinforced concrete beam and slab. For underground structures with conventional spans, solid reinforced concrete beam and slab have good applicability. However, for large-span underground structures, due to their large load characteristics, the amount of steel reinforcement in the beam and slab is large, the amount of concrete used is relatively large, and the self-weight of the structure is also relatively large, which is not conducive to saving materials and reducing costs. The transportation and hoisting costs that need to be invested are also relatively high, seriously affecting the economy of reinforced concrete beam and slab.

[0004] Since the existing solid reinforced concrete beam and slab cannot well meet the special requirements of large-span underground structures, it is necessary to propose a new large-span underground structure hollow box-shaped steel reinforced concrete beam and slab and a manufacturing method according to the characteristics of large-span underground structures, which is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the present invention aims to propose a new large-span underground structure hollow box-shaped steel reinforced concrete beam and slab to reduce the self-weight, improve the bearing capacity, solve the problems existing in traditional solid reinforced concrete beam and slab, and enhance the overall performance of the structure.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A large-span underground structure hollow box-shaped steel reinforced concrete beam and slab, comprising a concrete beam, a concrete slab, a hollow steel plate box, shear studs, and steel bars. The hollow steel plate box is arranged in the concrete beam and the concrete slab, making the concrete beam and the concrete slab in a hollow structure. The shear studs are welded on the outer surface of the hollow steel plate box in the concrete beam for connecting the hollow steel plate box and the concrete beam and transmitting shear force. The steel bars are arranged in the concrete beam and the concrete slab and have no contact with the hollow steel plate box and the shear studs.

[0008] Further, the cross-sectional shape of the hollow steel box can be rectangular, circular, oval or polygonal, but is not limited to the above cross-sectional forms, and it is a hollow structure with no filling inside.

[0009] Further, the cross-sectional shapes and sizes of the hollow steel boxes in the concrete beam and the concrete slab can be the same or different, depending on the specific engineering requirements.

[0010] Further, the number of the hollow steel boxes can be one or more, depending on the sizes of the concrete beam and the concrete slab and the specific engineering requirements.

[0011] Further, the concrete type of the concrete beam and the concrete slab can be ordinary concrete, high-strength concrete, expansive concrete, self-compacting concrete, recycled aggregate concrete, fly ash concrete or fiber concrete.

[0012] Further, the concrete beam and the concrete slab are cast-in-place structures, and the number of the concrete beams can be one or more.

[0013] Further, a number of steel bars are longitudinally arranged along the circumference of the hollow steel box in the concrete beam, and a number of steel bars are longitudinally arranged in the concrete slab. The arrangement and quantity of the steel bars are determined according to the specific engineering requirements.

[0014] A manufacturing method of a large-span underground structure with a hollow box-shaped steel reinforced concrete beam and slab as described above comprises the following steps:

[0015] (1) Select the type of the built-in hollow steel box according to the engineering needs.

[0016] (2) Weld shear studs on the outer surface of the hollow steel box to be placed in the concrete beam to transfer shear force.

[0017] (3) Determine the shape and size of the concrete beam and the concrete slab, and fabricate the formwork.

[0018] (4) Seal one end of the formwork, put the hollow steel box and the shear studs welded thereon into the formwork, place them at the predetermined positions, and erect the steel bars.

[0019] (5) Pour concrete between the formwork and the hollow steel box, level it, and cure the concrete.

[0020] (6) After curing, remove the formwork, and the novel large-span underground structure with a hollow box-shaped steel reinforced concrete beam and slab is fabricated.

[0021] Compared with the prior art, the large-span underground structure of the hollow box-shaped steel reinforced concrete beam and slab and its manufacturing method of the present invention have the following advantages: Through the synergistic effect of concrete, hollow steel plates, shear studs and steel bars, this structure can give full play to the advantages of high tensile strength of the steel section and good compressive performance of the concrete; Since the concrete increases the section stiffness, it can effectively avoid the local buckling of the hollow steel plates and improve the bearing capacity of the hollow steel plate part; The concrete composite structure of the hollow steel plates has good ductility and deformation ability, showing good seismic performance; At the same time, according to the actual engineering needs, the number of hollow steel plates can be flexibly arranged, and the cross-sectional form of the hollow steel plates can be selected to better meet the structural requirements; The hollow beam and slab structure can effectively reduce the self-weight, reduce the consumption of concrete and steel bars, improve the structural bearing capacity, reduce the section size of the beam and slab, and increase the building use space. It can be widely applied to building structures, bridge structures and other engineering structures, and is especially suitable for large-span underground structures with large load characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the hollow box-shaped steel reinforced concrete beam and slab of the new large-span underground structure, where A is the concrete beam;

[0024] Figures 2 to 5 is a schematic cross-sectional view of the hollow steel plates of different shapes.

[0025] DESCRIPTION OF THE REFERENCE NUMERALS:

[0026] 1, concrete beam; 2, concrete slab; 3, hollow steel plate; 4, shear stud; 5, steel bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0030] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0031] Such as Figures 1-5As shown in the figure, a large-span underground structure with a hollow box-shaped steel-concrete beam and slab includes a concrete beam 1, a concrete slab 2, a hollow steel plate box 3, shear studs 4, and steel bars 5. The cross-sectional shape of the hollow steel plate box 3 can be rectangular, circular, oval, or polygonal, but is not limited to the above cross-sectional forms, and it is a hollow structure with no filling inside. The hollow steel plate box 3 is arranged in the concrete beam 1 and the concrete slab 2, making the concrete beam 1 and the concrete slab 2 in a hollow structure. The cross-sectional shapes and sizes of the hollow steel plate boxes 3 in the concrete beam 1 and the concrete slab 2 can be the same or different, depending on the specific engineering requirements. The number of the hollow steel plate boxes 3 can be one or more, depending on the sizes of the concrete beam 1 and the concrete slab 2 and the specific engineering requirements. The shear studs 4 are welded to the outer surface of the hollow steel plate box 3 inside the concrete beam 1 for connecting the hollow steel plate box 3 and the concrete beam 1 and transmitting shear force. The steel bars 5 are arranged in the concrete beam 1 and the concrete slab 2 and have no contact with the hollow steel plate box 2 and the shear studs 3. A number of steel bars 5 are longitudinally arranged along the circumference of the hollow steel plate box 3 inside the concrete beam 1, and a number of steel bars 5 are longitudinally arranged inside the concrete slab 2. The arrangement and quantity of the steel bars 4 depend on the specific engineering requirements. The concrete types of the concrete beam 1 and the concrete slab 2 can be ordinary concrete, high-strength concrete, expansive concrete, self-compacting concrete, recycled aggregate concrete, fly ash concrete, or fiber concrete. The concrete beam and the concrete beam-slab are cast-in-place structures, and the number of the concrete beams 1 can be one or more.

[0032] A manufacturing method of the large-span underground structure with the above-mentioned hollow box-shaped steel-concrete beam and slab is as follows:

[0033] (1) According to the engineering needs, select the type of the built-in hollow steel plate box 3. The cross-sectional forms of the selectable hollow steel plate boxes 3 are as Figures 2-5 shown, and are not limited to the above cross-sectional forms.

[0034] (2) Weld the shear studs 4 to the outer surface of the hollow steel plate box 3 to be placed in the concrete beam to transmit shear force.

[0035] (3) Determine the shapes and sizes of the concrete beam 1 and the concrete slab 2 and make the formwork.

[0036] (4) Seal one end of the formwork, put the hollow steel plate box 3 and the shear studs 4 welded thereon into the formwork, place them at the predetermined positions, and arrange the steel bars 5.

[0037] (5) Pour concrete between the formwork and the hollow steel plate box 3, level it, and cure the concrete.

[0038] (6) After the curing is completed, remove the formwork, and the new large-span underground structure with the hollow box-shaped steel-concrete beam and slab is manufactured.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large-span underground structure with a hollow box-shaped steel reinforced concrete beam and slab, characterized in that: It includes a concrete beam, a concrete slab, a hollow steel box, shear studs and steel bars. The hollow steel box is arranged in the concrete beam and the concrete slab. The shear studs are welded on the outer surface of the hollow steel box inside the concrete beam. The steel bars are arranged in the concrete beam and the concrete slab. The cross-sectional shape of the hollow steel box is circular, oval or polygonal. The hollow steel box is a hollow structure without internal filling. The cross-sectional shapes and sizes of the hollow steel boxes in the concrete beam and the concrete slab are the same or different. The number of the hollow steel boxes is one or more. A number of steel bars are longitudinally arranged along the circumference of the hollow steel box inside the concrete beam, and a number of steel bars are longitudinally arranged inside the concrete slab. The concrete types of the concrete beam and the concrete slab are ordinary concrete, high-strength concrete, expansive concrete, self-compacting concrete, recycled aggregate concrete, fly ash concrete or fiber concrete.

2. The large-span underground structure of a hollow box-shaped steel reinforced concrete beam and slab according to claim 1, wherein: The concrete beam and the concrete slab are cast-in-place structures, and the number of the concrete beams is one or more.

3. A manufacturing method for the large-span underground structure's hollow box-shaped steel reinforced concrete beam and slab described in any one of the above claims 1-2, characterized in that, The steps are as follows: (1) Select the type of the built-in hollow steel box according to the project requirements. (2) Weld the shear studs on the outer surface of the hollow steel box to be placed in the concrete beam to transfer the shear force. (3) Determine the shape and size of the concrete beam and the concrete slab and make the formwork. (4) Seal one end of the formwork, put the hollow steel box and the shear studs welded on it into the formwork, place them at the predetermined position, and erect the steel bars. (5) Pour concrete between the formwork and the hollow steel box, level it, and cure the concrete. (6) After the curing is completed, remove the formwork, and the large-span underground structure of the hollow box-shaped steel reinforced concrete beam and slab is fabricated.

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