A large-span underground structure outer package U-shaped steel reinforced concrete beam and a manufacturing method thereof

Abstract

The application provides a novel large-span underground structure outer-wrapped U-shaped steel reinforced concrete beam and a manufacturing method thereof. The concrete beam structure comprises a concrete beam body, a U-shaped steel, a shear connector and a steel bar. The U-shaped steel is wrapped outside the concrete beam and located at the middle and lower side of the concrete beam. The shear connector is welded to the inner side of the U-shaped steel and used for connecting the U-shaped steel and the concrete beam and transmitting the shear force. The steel bar is arranged in the concrete beam and does not contact the U-shaped steel and the shear connector. The outer-wrapped U-shaped steel reinforced concrete beam structure can significantly improve the tensile bending performance of the beam, improve the structural bearing capacity and reduce the beam section size. The structure can be widely applied to building structures, bridge structures and other engineering structures and is particularly suitable for large-span underground structures with large load characteristics.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of structural engineering, in particular to a large-span underground structure outer package U-shaped steel reinforced concrete beam and a manufacturing method thereof. BACKGROUND

[0002] In recent years, the modernization level of China is gradually improved, and the demand for urban space capacity is rapidly expanding, which leads to the increasingly nervous urban land resources, and the development and utilization of underground space is imperative. With the increasing volume of underground structures and the increasingly complex load, the traditional form of underground structure cannot meet the requirements of today's underground space development. In order to adapt to the trend of large-span, multi-functional and three-dimensional crossing development of modern underground space development, 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 of large-span structures during construction and service, and to improve production efficiency and strive for the best benefit with limited resources.

[0003] The existing beam is mostly a reinforced concrete beam. For conventional span underground structures, the reinforced concrete beam has good applicability. However, for large-span underground structures, due to the characteristics of large load, the middle and lower parts of the beam are easily cracked under the action of large tension and bending moment, and the crack size exceeds the specification limit. Therefore, effective measures must be taken to control the generation of cracks without significantly increasing the cost to ensure the normal work of the beam structure. Since the existing reinforced concrete beam cannot well meet the special requirements of large-span underground structures, a new type of outer package U-shaped steel reinforced concrete beam and its manufacturing method are proposed to solve the problem. SUMMARY

[0004] Therefore, the present application aims to provide a large-span underground structure outer package U-shaped steel reinforced concrete beam and a manufacturing method thereof to improve the tensile bending performance of the beam structure, inhibit the generation of concrete cracks, solve the problems of traditional reinforced concrete beams, and improve the overall performance of the structure.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] The application discloses a U-shaped steel-concrete composite beam for a large-span underground structure, which comprises a concrete beam body, a U-shaped steel, a shear connector and a steel bar, wherein the U-shaped steel is wrapped outside the concrete beam body and located at the lower side of the concrete beam body; the shear connector is welded to the inner side of the U-shaped steel and used for connecting the U-shaped steel and the concrete beam body and transmitting shear force; and the steel bar is arranged in the concrete beam body and does not contact with the U-shaped steel and the shear connector.

[0007] Further, the shear connector is a T-shaped steel which is uniformly arranged on the steel plates at the left and right sides of the U-shaped steel, and a steel bar is arranged between two adjacent T-shaped steels in the concrete beam body; and a plurality of steel bars are arranged near the top and bottom of the concrete beam body.

[0008] Further, a plurality of angle steels are symmetrically arranged on the steel plates at the left and right sides of the U-shaped steel, and a U-shaped steel is welded to the symmetrically arranged angle steels; a part of the U-shaped steel extends out of the U-shaped steel, and a threaded hole is formed in the extended part; when local buckling or other problems occur in a part of the U-shaped steel, a rubber plate and a bending-resistant steel plate are fixed to the outer wall of the U-shaped steel through a connecting bolt in sequence; a plurality of channel steels are arranged in the U-shaped steel, and a T-shaped steel is arranged on the outer wall of each channel steel; the T-shaped steels on the outer walls of two adjacent channel steels are arranged in a staggered mode; a steel bar is arranged in each channel steel; and a plurality of steel bars are arranged near the top of the concrete beam body.

[0009] Further, the concrete type of the concrete beam body can be ordinary concrete, high-strength concrete, expansive concrete, self-compacting concrete, recycled aggregate concrete, fly ash concrete or fiber concrete.

[0010] Further, the steel plates at the left and right sides of the U-shaped steel can be flush with the concrete beam body or lower than the concrete beam body.

[0011] Further, the steel bars are arranged in a longitudinal direction of the concrete beam body, and the arrangement and quantity of the steel bars are determined according to specific engineering requirements.

[0012] Further, the shear connector can be a shear bolt, an angle steel, a channel steel, an I-shaped steel, a T-shaped steel or other connecting members with shear resistance, which includes but is not limited to the above connecting members.

[0013] A manufacturing method of the U-shaped steel-concrete composite beam for a large-span underground structure is provided, and the manufacturing method comprises the following steps:

[0014] (1) According to the engineering requirement, the shear connector is selected.

[0015] (2) The shear connector is welded on the inner surface of the U-shaped steel to transmit the shear force.

[0016] (3) The shape and size of the concrete beam are determined, and the formwork is made.

[0017] (4) One end of the formwork is sealed, the U-shaped steel and the welded shear connector are sleeved into the formwork, and are placed at the predetermined position, and the steel bars are erected.

[0018] (5) The concrete is poured in the formwork, is leveled, and the concrete is cured.

[0019] (6) After the curing is completed, the formwork is removed, and the new U-shaped steel encased concrete beam of large-span underground structure is made.

[0020] Compared with the prior art, the U-shaped steel encased concrete beam of large-span underground structure and the manufacturing method thereof have the following advantages: under the structure form, the concrete, the U-shaped steel, the shear connector and the steel bars cooperate, the advantages of high tensile strength of the steel and good compression performance of the concrete can be fully utilized; due to the increased cross-sectional stiffness of the concrete, the local buckling of the U-shaped steel can be effectively avoided, and the bearing capacity of the U-shaped steel part is improved; the U-shaped steel-concrete composite structure has good ductility and deformation capacity, and shows good seismic performance; meanwhile, according to the actual engineering requirement, the shear connector can be replaced by other forms of steel to better adapt to the structure requirement; the U-shaped steel encased concrete beam structure can significantly improve the tensile bending performance of the beam, improve the structure bearing capacity, and reduce the beam cross-sectional size, and 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 DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0022] Figure 1 is a structure schematic view of embodiment 1 (the steel plates on both sides of the U-shaped steel are flush with the height of the concrete beam body);

[0023] Figure 2 is a structure schematic view of embodiment 1 (the steel plates on both sides of the U-shaped steel are lower than the height of the concrete beam body);

[0024] Figures 3 to 7 is a structure schematic view of different shear connectors;

[0025] Figure 8is a structural schematic diagram of embodiment 2 (the steel plates on both sides of the U-shaped steel are flush with the height of the concrete beam body) of the present application;

[0026] Figure 9 is a structural schematic diagram of embodiment 2 (the steel plates on both sides of the U-shaped steel are lower than the height of the concrete beam body) of the present application.

[0027] Legend of reference signs:

[0028] 1, concrete beam body; 2, U-shaped steel; 3, T-shaped steel; 4, steel bar; 5, angle steel; 6, U-shaped steel bar; 7, bolt; 8, rubber plate; 9, bending-resistant steel plate; 10, channel steel. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] As Figure 1 , 2As shown, a large-span underground structure with an external U-shaped steel-concrete composite beam includes a concrete beam body 1, U-shaped steel sections 2, shear connectors, and reinforcing bars 4. The U-shaped steel section 2 is externally encased in the concrete beam body 1. The steel plates on the left and right sides of the U-shaped steel section 2 can be flush with or lower than the concrete beam body 1. The shear connectors are welded to the inside of the U-shaped steel section 2 for connecting the U-shaped steel section and the concrete beam body and for transmitting shear force. The reinforcing bars 4 are erected inside the concrete beam body 1 and do not contact the U-shaped steel section or the shear connectors. The shear connectors are T-shaped steel sections 3, evenly distributed along the steel plates on the left and right sides of the U-shaped steel section 2. Reinforcing bars 4 are provided between adjacent T-shaped steel sections 3 inside the concrete beam body 1. Multiple reinforcing bars 4 are erected near the top and bottom of the concrete beam body 1. The U-shaped steel-concrete composite beam structure can significantly improve the tensile and bending performance of the beam, enhance the structural bearing capacity, and reduce the beam cross-sectional size. It can be widely used in building structures, bridge structures and other engineering structures, and is especially suitable for large-span underground structures with large load characteristics.

[0034] like Figures 3-7 As shown, the shear-resistant connector can be a shear stud, angle steel, channel steel, I-beam, T-beam, or other connecting member with shear resistance, including but not limited to the above-mentioned connector types.

[0035] like Figure 8 , 9 As shown, another embodiment of the U-shaped steel internal shear connector is as follows:

[0036] Several angle steels 5 are symmetrically arranged on the steel plates on both sides of the U-shaped steel section 2. U-shaped reinforcing bars 6 are welded to the symmetrically arranged angle steels 5. A portion of the U-shaped reinforcing bars 6 extends out of the U-shaped steel section 2, and the extended portion is threaded. When local buckling or other problems occur in a certain part of the U-shaped steel section, the rubber plate 8 and the bending steel plate 9 are fixed to the outer wall of the U-shaped steel section 2 in sequence by bolts 7. Several channel steels 10 are arranged at the bottom inside the U-shaped steel section 2. T-shaped steels 3 are arranged on the outer wall of the channel steels 10. The T-shaped steels 3 on the outer walls of two adjacent channel steels 10 are staggered. Reinforcing bars 4 are erected inside the channel steels 10. Multiple reinforcing bars 4 are erected near the top of the concrete beam body 1 inside the concrete beam body 1. In this structural form, the concrete, angle steel, channel steel, T-shaped steel and reinforcing bars work together to give full play to the advantages of the high tensile strength of the steel section and the good compressive strength of the concrete.

[0037] The concrete type of the aforementioned concrete beam body 1 can be ordinary concrete, high-strength concrete, expansive concrete, self-compacting concrete, recycled aggregate concrete, fly ash concrete, or fiber-reinforced concrete. The reinforcing bars 4 are arranged longitudinally along the concrete beam body 1, and the arrangement and quantity of the reinforcing bars depend on the specific project requirements.

[0038] The manufacturing method of the large-span underground structure outer-wrapped U-shaped steel reinforced concrete beam is as follows:

[0039] (1) According to the engineering requirement, the shear connector is selected, and the forms of the shear connector that can be selected are as shown in the drawing, including but not limited to the above-mentioned connector forms. Figures 3-7

[0040] (2) The shear connector is welded on the inner surface of the U-shaped steel 2 to transfer the shear force.

[0041] (3) The shape and size of the concrete beam 1 are determined, and the formwork is manufactured.

[0042] (4) One end of the formwork is sealed, the U-shaped steel 2 and the shear connector welded thereon are sleeved into the formwork, placed at the predetermined position, and the steel bars 4 are erected.

[0043] (5) The concrete is poured in the formwork, leveled, and the concrete is cured.

[0044] (6) After the curing is completed, the formwork is removed, and the new large-span underground structure outer-wrapped U-shaped steel reinforced concrete beam is manufactured.

[0045] In the embodiment 2, in the step four, the U-shaped steel bar 6 is welded on the symmetrically arranged angle steel 5, and a part of the U-shaped steel bar 6 extends out of the U-shaped steel 2, and the extended part is processed with threads.

[0046] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A large span underground structure externally wrapped U-shaped steel reinforced concrete beam, characterized by: The concrete beam body, the U-shaped steel, the shear connector and the reinforcing steel are included, the U-shaped steel is wrapped outside the concrete beam body, the shear connector is welded inside the U-shaped steel, and the reinforcing steel is arranged inside the concrete beam body; A plurality of angle steels are symmetrically arranged on the left and right sides of the U-shaped steel, the U-shaped reinforcing steel is welded on the symmetrically arranged angle steels, a part of the U-shaped reinforcing steel extends out of the U-shaped steel, the extending part is provided with a thread, a plurality of channel steels are arranged at the bottom of the U-shaped steel, T-shaped steels are arranged on the outer side walls of the channel steels, the T-shaped steels on the outer side walls of adjacent two channel steels are arranged in an interlaced manner, reinforcing steels are arranged in the channel steels, and a plurality of reinforcing steels are arranged in the concrete beam body and close to the top of the concrete beam body; The rubber plate and the bending-resistant steel plate are fixed on the outer side walls of the U-shaped steel in sequence through bolts; The left and right side plates of the U-shaped steel are flush with the concrete beam body in height, or lower than the concrete beam body in height; The reinforcing steels are arranged in the longitudinal direction of the concrete beam body.

2. The method of manufacturing a U-shaped steel encased reinforced concrete beam for a large-span underground structure according to claim 1, characterized in that, The steps are as follows: (1) according to the engineering requirement, the shear connector is selected; (2) the shear connector is welded on the inner surface of the U-shaped steel to transmit the shear force; (3) the shape and size of the concrete beam are determined, and the formwork is made; (4) one end of the formwork is sealed, the U-shaped steel and the shear connector welded thereon are sleeved into the formwork and placed at the predetermined position, and the reinforcing steel is erected; (5) the concrete is poured in the formwork, leveled and maintained; (6) after the maintenance is completed, the formwork is removed, and the large-span underground structure wrapped with the U-shaped steel concrete beam is completed.

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