阅读说明：本技术 一种外包复材缠绕管双钢管混凝土构件及其制备方法 (Double-steel-pipe concrete member with wrapped composite winding pipe and preparation method thereof ) 是由 陈光明 陆奕辰 林佐宏 郭远泽 李召兵 胡福南 刘伟楠 于 2021-08-25 设计创作，主要内容包括：本发明涉及一种外包复材缠绕管双钢管混凝土构件,包括由外到内依次设置的复材缠绕管层、外钢管层、混凝土层和内钢管层；内钢管层的内侧为空腔或填充混凝土；混凝土层通过浇筑的形式设置在内钢管层和外钢管层之间；外钢管层和内钢管层之间设置有多个连接件,连接件的一端与内钢管层外侧固定连接,连接件的另一端与外钢管层内侧固定连接。本发明还涉及一种外包复材缠绕管双钢管混凝土构件的制备方法。本发明施工方便、抗震性能好、刚度高,属于建筑结构技术领域。(The invention relates to an outsourcing composite material winding pipe double steel pipe concrete component which comprises a composite material winding pipe layer, an outer steel pipe layer, a concrete layer and an inner steel pipe layer which are sequentially arranged from outside to inside; the inner side of the inner steel pipe layer is a cavity or filled with concrete; the concrete layer is arranged between the inner steel pipe layer and the outer steel pipe layer in a pouring mode; a plurality of connecting pieces are arranged between the outer steel pipe layer and the inner steel pipe layer, one end of each connecting piece is fixedly connected with the outer side of the inner steel pipe layer, and the other end of each connecting piece is fixedly connected with the inner side of the outer steel pipe layer. The invention also relates to a preparation method of the double-steel-pipe concrete member with the outer clad composite material winding pipe. The invention has convenient construction, good anti-seismic performance and high rigidity, and belongs to the technical field of building structures.)

1. The utility model provides a two steel pipe concrete component of outsourcing clad material winding pipe which characterized in that: the composite steel pipe comprises a composite winding pipe layer, an outer steel pipe layer, a concrete layer and an inner steel pipe layer which are sequentially arranged from outside to inside; the inner side of the inner steel pipe layer is a cavity or filled with concrete; the concrete layer is arranged between the inner steel pipe layer and the outer steel pipe layer in a pouring mode; a plurality of connecting pieces are arranged between the outer steel pipe layer and the inner steel pipe layer, one end of each connecting piece is fixedly connected with the outer side of the inner steel pipe layer, and the other end of each connecting piece is fixedly connected with the inner side of the outer steel pipe layer.

2. The double steel pipe concrete structural member with the wrapping composite material winding pipe as claimed in claim 1, wherein: the connecting pieces are selected from one or a plurality of combinations of longitudinal stiffening ribs, transverse stiffening ribs and welding nails.

3. The double steel pipe concrete structural member with the wrapping composite material winding pipe as claimed in claim 1, wherein: the composite material winding pipe layer is wound on the outer side of the outer steel pipe layer through a winding pipe process or wound on the outer side of the outer steel pipe layer through a hand lay-up process; the fiber of the composite winding tube layer is one or the combination of more than one of carbon fiber, glass fiber, aramid fiber and basalt fiber.

4. The double steel pipe concrete structural member with the wrapped composite material winding pipe as claimed in claim 3, wherein: the composite material winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a continuous winding mode or is wrapped on the outer side of the outer steel pipe layer in a sectional winding mode; the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at an equal angle, or the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at a variable angle; the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in an equal thickness mode, or the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a variable thickness mode.

5. The double steel pipe concrete structural member with the wrapping composite material winding pipe as claimed in claim 1, wherein: the axes of the steel pipes in the inner steel pipe layer are the same as or different from the axes of the steel pipes in the outer steel pipe layer; in the inner steel pipe layer, the axis of the steel pipe is a straight line or a curve; in the outer steel pipe layer, the axis of the steel pipe is a straight line or a curve.

6. The encased composite material wound pipe concrete filled double steel tube structure as claimed in claim 5, wherein: in the inner steel pipe layer, the number of the steel pipes is one or more; a single cavity or a plurality of cavities are arranged between the inner steel pipe layer and the outer steel pipe layer.

7. The encased composite material wound pipe concrete filled double steel tube structure as claimed in claim 5, wherein: in the inner steel pipe layer, the cross section of the steel pipe is circular, oval or polygonal; in the outer steel pipe layer, the cross section of the steel pipe is circular, oval or polygonal.

8. The double steel pipe concrete structural member with the wrapping composite material winding pipe as claimed in claim 1, wherein: the thickness of the inner steel pipe layer is 4-40mm, the thickness of the outer steel pipe layer is 2-30mm, the thickness of the concrete layer is 20-200mm, and the thickness of the composite material winding pipe layer is 1-20 mm.

9. A method for manufacturing a clad-wound tubular double steel tube concrete structure according to any one of claims 1 to 8, comprising the steps of:

s1: fixedly connecting the steel pipes of the inner steel pipe layer and the steel pipes of the outer steel pipe layer by using a connecting piece to form a double-steel-pipe assembly;

s2: winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer by taking the double-steel pipe assembly obtained in the step S1 as a template;

s3: and taking the double-steel-pipe assembly formed in the step S2 and wound with the composite wound pipe layer as a template, and pouring a concrete layer between the two steel pipes.

10. A method for manufacturing a clad-wound tubular double steel tube concrete structure according to any one of claims 1 to 8, comprising the steps of:

s1: taking the outer steel pipe layer as a template, and winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer;

s2, fixedly connecting the steel pipe of the inner steel pipe layer and the outer steel pipe layer wound with the outer composite material winding pipe layer by using a connecting piece to form a double-steel pipe assembly;

s3: and taking the double-steel-pipe assembly formed in the step S2 and wound with the composite wound pipe layer as a template, and pouring a concrete layer between the two steel pipes.

Technical Field

The invention relates to a building structure, in particular to an outer clad composite material winding pipe double-steel-pipe concrete member and a preparation method thereof.

Background

The existing building structure widely has the problems of structural performance degradation caused by steel corrosion and insufficient shock resistance caused by insufficient structural ductility. In view of the above, the inventor has proposed a composite-concrete-steel double-walled hollow composite member having superior corrosion resistance and seismic resistance. The combined member consists of an outer composite pipe, an inner steel pipe and sandwich concrete between the outer composite pipe and the inner steel pipe. The composite pipe on the outer side has excellent corrosion resistance, and the steel pipe in the inner part can be protected from corrosion; the existence of the hollow steel pipe at the inner side reduces the dead weight of the combined member, and is convenient for the transportation and installation of the member; the composite pipe and the steel pipe simultaneously provide restraint for the sandwich concrete, so that the concrete is in a triaxial compression state, and the mechanical property of the combined member is greatly improved. Meanwhile, the composite pipe and the steel pipe can be used as a template for pouring sandwich concrete, so that the construction process is simplified, the cost of the template is saved, and the composite pipe and the steel pipe have good economic benefits.

The composite material-concrete-steel double-wall hollow combined member has a plurality of advantages, is beneficial to building an engineering structure with higher bearing capacity, stronger corrosion resistance and better earthquake resistance, and has important engineering popularization value. However, in practical application, it is found that the composite material-concrete-steel double-wall hollow combined member still has the following defects: firstly, the existing composite pipe production process has the problem of difficult demoulding when manufacturing the composite pipe with a curve axis, so that the application of the combined member is limited to a certain extent when the axis is a curve; secondly, when the composite pipe (particularly the composite pipe with the rectangular section) is used as a template for concrete pouring, the composite pipe is likely to bulge outwards in the concrete pouring process due to insufficient rigidity; thirdly, in the manufacturing process of the composite material-concrete-steel double-wall hollow combined member, the composite material pipe and the steel pipe are generally prepared separately, then temporary positioning is carried out through auxiliary measures, concrete is poured in the interlayer, and when a complex structural node (such as a space node) is built, because the steel pipe node needs to be sleeved inside the composite material node, holes need to be formed in the composite material pipe or the composite material pipe needs to be cut and then connected together in a proper mode, the construction and the building are difficult. Therefore, how to solve the technical problems in the production and construction process and application while utilizing the excellent corrosion resistance and constraint performance of the composite pipe is the key for popularizing the application of the composite pipe in the field of civil engineering structures.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to: the outer-wrapped composite material winding pipe double-steel pipe concrete member is convenient to construct, good in anti-seismic performance and high in rigidity, and the preparation method of the outer-wrapped composite material winding pipe double-steel pipe concrete member is provided.

In order to achieve the purpose, the invention adopts the following technical scheme:

an outer-wrapped composite material winding pipe double-steel pipe concrete component comprises a composite material winding pipe layer, an outer steel pipe layer, a concrete layer and an inner steel pipe layer which are sequentially arranged from outside to inside; the inner side of the inner steel pipe layer is a cavity or filled with concrete; the concrete layer is arranged between the inner steel pipe layer and the outer steel pipe layer in a pouring mode; a plurality of connecting pieces are arranged between the outer steel pipe layer and the inner steel pipe layer, one end of each connecting piece is fixedly connected with the outer side of the inner steel pipe layer, and the other end of each connecting piece is fixedly connected with the inner side of the outer steel pipe layer.

Preferably, the connecting pieces are one or a combination of a longitudinal stiffening rib, a transverse stiffening rib and a welding nail.

Preferably, the composite material winding pipe layer is wound on the outer side of the outer steel pipe layer through a winding pipe process, or wound on the outer side of the outer steel pipe layer through a hand lay-up process; the fiber of the composite winding tube layer is one or more of carbon fiber, glass fiber, aramid fiber and basalt fiber.

Preferably, the composite material winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a continuous winding mode or is wrapped on the outer side of the outer steel pipe layer in a segmented winding mode; the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at an equal angle, or the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at a variable angle; the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in an equal thickness mode, or the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a variable thickness mode.

Preferably, the axes of the steel pipes in the inner steel pipe layer are the same as or different from the axes of the steel pipes in the outer steel pipe layer; in the inner steel pipe layer, the axis of the steel pipe is a straight line or a curve; in the outer steel pipe layer, the axis of the steel pipe is a straight line or a curve.

Preferably, in the inner steel pipe layer, the number of the steel pipes is one or more; a single chamber is arranged between the inner steel pipe layer and the outer steel pipe layer or a multi-chamber is formed by separating an inner steel baffle plate.

Preferably, in the inner steel pipe layer, the cross-sectional shape of the steel pipe is circular, oval or polygonal; in the outer steel pipe layer, the cross section of the steel pipe is circular, oval or polygonal.

Preferably, the thickness of the inner steel pipe layer is 4-40mm, the thickness of the outer steel pipe layer is 2-30mm, the thickness of the concrete layer is 20-200mm, and the thickness of the composite winding pipe layer is 1-20 mm.

A preparation method of an outer clad composite material winding pipe double steel pipe concrete member comprises the following steps:

s1: fixedly connecting the steel pipes of the inner steel pipe layer and the steel pipes of the outer steel pipe layer by using a connecting piece to form a double-steel-pipe assembly; s2: winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer by taking the double-steel pipe assembly obtained in the step S1 as a template; s3: and taking the double-steel-pipe assembly formed in the step S2 and wound with the composite wound pipe layer as a template, and pouring a concrete layer between the two steel pipes.

The preparation method of the double steel pipe concrete member with the outer clad composite material winding pipe can also comprise the following steps:

s1: taking the outer steel pipe layer as a template, and winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer; s2, fixedly connecting the steel pipe of the inner steel pipe layer and the steel pipe of the outer steel pipe layer wound with the composite material winding pipe layer by using a connecting piece to form a double-steel-pipe assembly; s3: and taking the double-steel-pipe assembly formed in the step S2 and wound with the composite wound pipe layer as a template, and pouring a concrete layer between the two steel pipes.

In summary, the present invention has the following advantages:

1. the engineering application is more convenient. When the invention is applied to a component with a curve axis, the composite material is directly wound on the outer side of the outer steel pipe layer to form a whole, so that the problem that the composite material wound pipe layer with the curve axis is difficult to demould after being manufactured independently is solved. Compared with a double-wall hollow column with only a composite winding pipe layer on the outer side, the double-wall hollow column has the advantages that the steel pipe on the outer side is used as the lining of the composite winding pipe layer, so that the double-wall hollow column is higher in bending rigidity, can better resist construction load without obvious deformation, and solves the problems that when the double-wall hollow column is applied to medium and large-size structural members, the outer composite winding pipe layer is too large in deformation and is easy to bulge outwards when concrete is poured; when the double-wall hollow column is applied to engineering, the inner steel pipe layer and the outer steel pipe layer are fixed by the connecting piece to form a double-steel-pipe assembly which can be used as a template for manufacturing the composite winding pipe layer and pouring concrete, so that the link that the steel pipe and the composite winding pipe layer need to be temporarily fixed before the concrete is poured in the double-wall hollow column is avoided; the invention can be used for conveniently manufacturing engineering structure nodes without temporarily forming holes on the composite winding pipe layer or cutting the composite pipe.

2. The material usage is more optimized. Compared with the double-wall hollow column only arranging the steel structure at the inner side, when the double-wall hollow column is applied to an engineering structure, the inner steel pipe layer and the outer steel pipe layer can be more optimally arranged at the inner side and the outer side according to different proportions according to the stress of the engineering structure part and the requirement of the construction process. The optimized arrangement and reasonable use of the inner steel pipe layer and the outer steel pipe layer can realize that the structure has higher rigidity and bearing capacity under the action of bending moment and torque under the condition of unchanged steel consumption, and the use efficiency of materials is greatly improved.

3. The connecting piece between the inner steel pipe layer and the outer steel pipe layer can be used as a fixing measure of the two steel pipes and can also be used as the mechanical property of a stiffening component reinforcing member.

Compared with the existing double-steel-tube concrete hollow column (comprising an inner steel tube, an outer corrugated steel tube and a gradient structure of fiber reinforced powder concrete filled in the middle interlayer, hereinafter referred to as double-steel-tube concrete hollow column for short) with the inner steel tube layer and the outer steel tube layer being steel tubes and the middle interlayer being a concrete layer, the composite material winding tube layer wound on the outer side is added. The composite winding pipe layer has good corrosion resistance, so that the steel pipe wrapped by the composite winding pipe layer, the inner side concrete, the inner steel pipe layer and the outer steel pipe layer can be protected from being corroded by the external environment, and the composite winding pipe layer has better durability. The composite material winding pipe layer can not only share load, but also restrain the outer steel pipe to avoid local buckling when the outer steel pipe is pressed, so that the strength utilization rate of the outer steel pipe is improved; in addition, the composite winding pipe layer can also provide restraint for the concrete layer together with the outer steel pipe, so that the strength, the deformability and the energy consumption capability of the restrained concrete are improved. Therefore, the functions of the outer-coated composite material winding pipe layer, the outer-side steel pipe and the concrete layer are not simply superposed, and the functional effect of 1+1>2 can be realized.

Compared with the fiber composite material restrained concrete filled steel tube, the invention adopts a hollow structural form, lightens the self weight of the structure and is beneficial to building a lighter and large-span structure; meanwhile, the hollow structure reduces the consumption of concrete and is beneficial to reducing carbon emission.

Compared with the method for reinforcing the steel pipe column by coating the round (or square) steel pipe concrete fiber composite material, the method mainly has the following differences. First, the two are used differently: the method for reinforcing the steel pipe column is mainly used for reinforcing the existing steel pipe column structure, and the method is mainly used for newly building structures and can be used for other structural parts except the columns, such as arch ribs, beams and the like. Secondly, the two are different in construction process: when the method for reinforcing the steel pipe column is implemented, the existing steel column needs to be subjected to rust removal treatment, then a round or square steel pipe is sleeved outside the existing steel column through a welding method, a fiber reinforced composite material is wound outside the newly added steel pipe, and finally self-compacting concrete is poured between the two pipes; in the invention, after the inner steel pipe layer and the outer steel pipe layer are connected and fixed through the connecting piece, the composite winding pipe layer is manufactured outside the outer steel pipe layer by using an integral formed by the inner steel pipe layer and the outer steel pipe layer as a mould, concrete is poured between the inner steel pipe layer coated with the composite winding pipe layer and the outer steel pipe layer, and finally, the two layers have different structures: in the method for reinforcing the steel pipe column, the inner and outer steel pipe layers have no connection measures, but in the method, the inner and outer steel pipe layers are connected by connecting pieces.

Compared with the existing solid tubular structure in which concrete and steel ribs are filled in the composite winding pipe layer, the solid tubular structure in which the concrete and the steel ribs are filled in the composite winding pipe layer sleeve steel pipe, and the solid tubular structure in which the concrete and the composite winding pipe layer are filled in the steel pipe restrict the core column, the concrete core-rod composite winding pipe can adopt a hollow structure, and the concrete is filled in the steel pipe only when needed, so that the concrete consumption is saved (the consumption of building raw materials and the carbon emission in the cement production process are reduced), the structure is lighter, the application is more flexible, and the transportation is more convenient; in addition, the invention is different from the three solid tubular structures in the manufacturing process: the composite wound tube layer is directly manufactured by taking the outer steel tube layer as a template through a hand pasting or winding process, the formed composite wound tube layer and the outer steel tube layer are integrated, and in the solid tubular structure, the composite wound tube layer is manufactured separately and then applied to the tubular structure.

Compared with the prior fabric reinforced ECC-steel tube-steel rib combined component, the invention has the following three differences: in terms of structure, the combined member of the steel-reinforced concrete composite member adopts a solid structure that steel ribs are filled in an outer steel pipe layer, the steel-reinforced concrete composite member adopts a structure that the inner steel pipe layer and the outer steel pipe layer are both steel pipes and the interlayer is concrete, and the inner steel pipe layer can adopt a hollow structure, so that the steel-reinforced concrete composite member is lighter in structure, more flexible to use and more convenient to transport and install; in the aspect of construction process, the composite winding pipe layer is formed by winding or manually pasting an outer steel pipe layer as a template, and the fabric reinforced ECC in the combined component is manufactured on the outer side of the steel pipe in multiple layers by a spraying process; in the aspect of functions, the composite winding pipe layer has better corrosion resistance than fabric reinforced ECC, and can provide better constraint for a concrete layer together with the inner steel pipe layer and the outer steel pipe layer, so that the concrete layer has better stress performance (strength, deformability and ductility).

Drawings

Fig. 1 is a perspective view of a double steel pipe concrete member with an outer clad composite material wound pipe.

Fig. 2a-2d are cross-sectional views of an overcladding material-wound tube concrete filled double steel tube member.

Fig. 3a-3c are perspective views of the inner steel pipe layer and the outer steel pipe layer connected by a connector. Fig. 3a is a perspective view of the connection of an inner steel pipe layer and an outer steel pipe layer by a transverse stiffener connection, fig. 3b is a perspective view of the connection of an inner steel pipe layer and an outer steel pipe layer by a longitudinal stiffener connection, and fig. 3c is a perspective view of the connection of an inner steel pipe layer and an outer steel pipe layer by a weld nail connection.

Fig. 4a-4e are schematic diagrams illustrating a manufacturing process of a double steel pipe concrete member with an outer clad composite material wound thereon. Fig. 4a shows an inner steel pipe layer, fig. 4b shows a connector mounted on the inner steel pipe layer, fig. 4c shows an outer steel pipe layer fixed to the connector, fig. 4d shows a composite wound pipe layer wound on the outer side of the outer steel pipe layer by a wound pipe process, and fig. 4e shows concrete poured between the inner steel pipe layer and the outer steel pipe layer.

Fig. 5a is a schematic cross-sectional view of an outer clad composite wound pipe double steel pipe concrete structure having a plurality of (2) circular inner steel pipes in an inner steel pipe layer.

Fig. 5b is a schematic cross-sectional view of an outer clad composite wound pipe double steel pipe concrete member having a plurality of (2) square inner steel pipes in the inner steel pipe layer.

Fig. 6a is a schematic cross-sectional view of a round outer clad material wound pipe double steel pipe concrete member with multiple cavities (4 cavities) formed between an inner steel pipe layer and an outer steel pipe layer.

Fig. 6b is a schematic cross-sectional view of a square outer clad material winding pipe double steel pipe concrete member with multiple cavities (4 cavities) formed between an inner steel pipe layer and an outer steel pipe layer.

Fig. 7 is a schematic diagram of the first embodiment.

FIG. 8 is a diagram illustrating a second embodiment.

FIG. 9 is a diagram illustrating a third embodiment.

Wherein, 1 is interior steel pipe layer, 2 is the concrete layer, 3 is outer steel pipe layer, 4 is the combined material winding pipe layer, 5 is the connecting piece, 6 is the cavity, 7 is the steel inner separator.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.

Example one

An outer-wrapped composite material winding pipe double-steel pipe concrete component comprises a composite material winding pipe layer, an outer steel pipe layer, a concrete layer and an inner steel pipe layer which are sequentially arranged from outside to inside; the inner side of the inner steel pipe layer is a cavity or filled with concrete; the concrete layer is arranged between the inner steel pipe layer and the outer steel pipe layer in a pouring mode; a plurality of connecting pieces are arranged between the outer steel pipe layer and the inner steel pipe layer, one end of each connecting piece is fixedly connected with the outer side of the inner steel pipe layer, and the other end of each connecting piece is fixedly connected with the inner side of the outer steel pipe layer. In this embodiment, the inner side of the inner steel pipe layer is a cavity and is not filled with concrete.

In this embodiment, an outer cladding-wound tubular double steel pipe concrete member is used as a structural column of a frame structure (as shown in fig. 7).

The axes of the steel pipes in the inner steel pipe layer are the same as or different from the axes of the steel pipes in the outer steel pipe layer; in the inner steel pipe layer, the axis of the steel pipe is a straight line or a curve; in the outer steel pipe layer, the axis of the steel pipe is a straight line or a curve. In the embodiment, in the inner steel pipe layer, the axis of the steel pipe is a straight line; in the outer steel pipe layer, the axis of the steel pipe is a straight line.

The connecting pieces are selected from one or a plurality of combinations of longitudinal stiffening ribs, transverse stiffening ribs and welding nails. The transverse stiffening ribs are of flat plate structures, and the thickness direction of the transverse stiffening ribs is parallel to the axial direction of the inner steel pipe layer. The longitudinal stiffening ribs are of a flat plate structure, and the thickness direction of the longitudinal stiffening ribs is perpendicular to the axial direction of the inner steel pipe layer. In this embodiment, the inner steel pipe layer and the outer steel pipe layer are connected by a connecting piece in a welding manner, and the connecting piece is a longitudinal stiffening rib.

The composite material winding pipe layer is wound on the outer side of the outer steel pipe layer through a winding pipe process or wound on the outer side of the outer steel pipe layer through a hand lay-up process. In this embodiment, the composite winding pipe layer is wound by a winding pipe process.

The composite material winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a continuous winding mode or is wrapped on the outer side of the outer steel pipe layer in a sectional winding mode; the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at an equal angle, or the composite winding pipe layer is wound on the outer side of the outer steel pipe layer at a variable angle; the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in an equal thickness mode, or the composite winding pipe layer is wrapped on the outer side of the outer steel pipe layer in a variable thickness mode. In this embodiment, the composite material winding pipe is continuously wound on the outer side of the outer steel pipe layer at the same thickness and angle.

The fiber of the composite winding pipe layer is one or the combination of more than one of carbon fiber, glass fiber, aramid fiber and basalt fiber. In this embodiment, the fibers of the composite winding tube layer are glass fibers (glass fibers, GFRP).

In the inner steel pipe layer, the cross section of the steel pipe is circular, oval or polygonal; in the outer steel pipe layer, the cross section of the steel pipe is circular, oval or polygonal. In this embodiment, the cross-sectional shapes of the inner steel pipe layer and the outer steel pipe layer are both circular.

The thickness of the inner steel pipe layer is 4-40mm, the thickness of the outer steel pipe layer is 2-30mm, the thickness of the concrete layer is 20-200mm, and the thickness of the composite material winding pipe layer is 1-20 mm. In this embodiment, the thickness of the inner steel pipe layer is 8mm, the outer diameter is 300mm, the thickness of the outer steel pipe layer is 4mm, the inner diameter is 400mm, the thickness of the GFRP pipe layer is 6mm, and the thickness of the concrete layer is 50 mm.

In the inner steel pipe layer, the number of the steel pipes is one or more; a single cavity or a plurality of cavities are arranged between the inner steel pipe layer and the outer steel pipe layer. Wherein, the multi-cavity chamber is formed by separating steel inner partition plates. The inner side of the inner steel pipe layer is partially filled with concrete according to requirements. The local part is filled with concrete along a certain section of the steel pipe axis of the inner steel pipe layer; in this embodiment, the ends of the members are filled with concrete within 500mm of the axis. In this embodiment, the number of steel pipes in the inner steel pipe layer is 1, and the number of cavities formed between the inner steel pipe layer and the outer steel pipe layer is 1.

A preparation method of an outer clad composite material winding pipe double steel pipe concrete member comprises the following steps:

s1: fixedly connecting the steel pipes of the inner steel pipe layer and the steel pipes of the outer steel pipe layer by using a connecting piece to form a double-steel-pipe assembly;

s2: winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer by taking the double-steel pipe assembly obtained in the step S1 as a template; s3: and taking the double-steel-pipe assembly formed in the step S2 and wound with the composite wound pipe layer as a template, and pouring a concrete layer between the two steel pipes.

Example two

In this embodiment, an outer clad wound pipe double steel pipe concrete member is used as a beam of a frame structure (as shown in fig. 8).

In this embodiment, the cross-sectional profile shapes of the steel pipes of the inner steel pipe layer and the outer steel pipe layer are both square, and the axes thereof coincide with each other.

In this embodiment, the thickness of the inner steel pipe layer is 8mm, the outer side length is 300mm, the thickness of the outer steel pipe layer is 4mm, the inner side length is 400mm, the thickness of the GFRP pipe is 6mm, and the thickness of the concrete layer is 50 mm.

A preparation method of an outer clad composite material winding pipe double steel pipe concrete member comprises the following steps:

s1: taking the outer steel pipe layer as a template, and winding fibers on the outer side of the outer steel pipe layer to form a composite material winding pipe layer;

s2, fixedly connecting the steel pipe of the inner steel pipe layer and the steel pipe of the outer steel pipe layer wound with the composite material winding pipe layer by using a connecting piece to form a double-steel-pipe assembly;

s3: and taking the double-steel-pipe assembly of the composite winding pipe layer formed in the step S2 as a template, and pouring a concrete layer between the two steel pipes. The embodiment is not described in the first embodiment.

EXAMPLE III

In this embodiment, an outer clad-wound tubular double steel pipe concrete structural member is used as a rib of an arch bridge structure (as shown in fig. 9).

In the embodiment, in the inner steel pipe layer, the axis of the steel pipe is a curve; in the outer steel pipe layer, the axis of the steel pipe is a curve.

In this embodiment, interior steel pipe layer and outer steel pipe layer are connected through the connecting piece, and the connecting piece is the welding nail.

In this embodiment, the cross-sectional shapes of the steel pipes of the inner steel pipe layer and the outer steel pipe layer are both circular, the thickness of the inner steel pipe layer is 16mm, the outer diameter is 600mm, the thickness of the outer steel pipe layer is 8mm, the inner diameter is 800mm, the thickness of the GFRP pipe layer is 12mm, and the thickness of the concrete layer is 100 mm.

The embodiment is not described in the first embodiment.

Example four

In this embodiment, an outer clad composite material wound pipe double steel pipe concrete member is used as a main beam of a bridge structure.

In this embodiment, the inner steel tube layer of a double-steel-tube concrete member with an outer clad composite material wound thereon has 2 steel tubes, as shown in fig. 5 a. The section of the outer steel pipe layer is rectangular, the length is 780mm, the width is 410mm, and the thickness is 12 mm; the cross sections of 2 steel pipes of the inner steel pipe layer are all circular, the outer diameter is 330mm, and the thickness is 16 mm; the GFRP tube layer thickness is 10 mm.

In this embodiment, the inner steel pipe layer and the outer steel pipe layer, and 2 steel pipes of the inner steel pipe layer are connected by connecting pieces, and the connecting pieces are longitudinal stiffening ribs. The embodiment is not mentioned in the second embodiment.

EXAMPLE five

In this embodiment, an outer clad composite material wound pipe double steel pipe concrete member is used as a bridge pier of a bridge structure.

In this embodiment, the space between the inner steel pipe layer and the outer steel pipe layer of the outer clad composite material wound pipe double-steel pipe concrete member is divided into 4 chambers by steel inner partition plates, as shown in fig. 6 a. The steel inner partition plate is in the form of a longitudinal stiffening rib and is arranged along the axial direction of the member in a full-length mode.

In the embodiment, the section of the outer steel pipe layer is circular, the inner diameter is 800mm, and the thickness is 12 mm; the section of the inner steel pipe layer is circular, the outer diameter of the inner steel pipe layer is 610mm, and the thickness of the inner steel pipe layer is 16 mm; the thickness of the GFRP tube layer is 12 mm; the thickness of the concrete layer was 95 mm.

The embodiment is not described in the first embodiment.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.