A FRP tube lightweight concrete truss beam and its construction method

Abstract

The present invention discloses an FRP tube lightweight concrete truss beam, comprising three parallel and non-coplanar longitudinal beam bodies, wherein the longitudinal beam bodies are composed of longitudinal FRP tubes and connecting balls spliced ​​alternately, both ends of the longitudinal beam bodies are connecting balls, the connecting balls of the first longitudinal beam body and the second longitudinal beam body are arranged one by one, and the corresponding two connecting balls are connected by a transverse FRP tube; the projections of the connecting balls of the third longitudinal beam body on the reference plane are respectively located in each quadrilateral area, and the connecting balls of the third longitudinal beam body are respectively connected to the connecting balls at the four corners of the corresponding quadrilateral area by oblique FRP tubes. A construction method of an FRP tube lightweight concrete truss beam is also disclosed. The FRP tube lightweight concrete truss beam improves the overall bending stiffness, is conducive to fully utilizing the strength of each FRP tube, is convenient for overall assembly and has high construction efficiency. The construction method of the FRP tube lightweight concrete truss beam has a reasonable step sequence design and high overall construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of truss beam structures, and in particular to an FRP tube lightweight concrete truss beam and a construction method thereof. Background Art

[0002] Fiber-reinforced plastics (FRP) are increasingly used in civil engineering buildings and bridge structures due to their advantages such as light weight, high strength, corrosion resistance and designability.

[0003] Since the fibers of FRP are distributed axially, FRP has excellent material strength. When FRP is subjected to unidirectional axial force along the fiber distribution direction, the advantages of FRP's high strength will be more fully utilized. In the truss structure, each rod mainly bears axial force. Therefore, when FRP is used as the material of the truss rod, the high strength characteristics of FRP will be maximized, and the overall strength of the truss structure will also be improved. At the same time, thanks to the lightweight and high-strength characteristics of FRP, using FRP materials instead of traditional steel materials can reduce the dead weight of the structure. In coastal areas and some high-humidity environments, rust-resistant FRP materials will also be more suitable than steel.

[0004] For economic purposes, the composite materials currently used in trusses are mainly glass fiber composite materials (GFRP). However, the elastic modulus of GFRP is low, only about 1 / 5 of that of steel. This means that when GFRP materials are used as truss members, the overall bending stiffness of the truss is low. When the deflection of the truss reaches the specification limit, the ultimate strength of FRP is only about 20-30%, and the design of the truss will be controlled by stiffness rather than strength. The ultra-high material strength of FRP materials has not been fully utilized. Therefore, increasing the stiffness of FRP trusses will be a key to fully utilizing the strength of FRP materials. At present, the main way to increase the stiffness of FRP trusses is to increase the height of the trusses, but this is not conducive to making the structure lightweight. In addition, in truss structures, the connection of FRP components cannot be welded like metal materials, so whether FRP components can be efficiently connected is also a key and difficulty in the application of FRP. At present, the main connection methods of FRP are bolt connection, adhesive connection and glue-screw mixed connection. However, the connection efficiency of these three connection methods is low, and the material strength of FRP cannot be fully utilized.

[0005] To this end, the Chinese patent "A spatial connection structure based on pre-tightening teeth to connect composite pipes" with the announcement number "CN205100374U" proposes to combine composite pipes with metal connectors by using pre-tightening teeth connection technology, and then weld the metal connectors at various parts at the nodes to complete the assembly. The spatial connection structure has high connection efficiency and simple connection, and gives full play to the mechanical properties of composite materials. However, this method has the following problems: (1) The spatial connection structure is only used for the connection between composite pipes and metal pipes. On the one hand, it is used to improve the connection efficiency, and on the other hand, it improves the bearing capacity of the connection between the composite pipe and the metal pipe, but it does not change the overall design concept of composite pipes controlled by stiffness. The problem of insufficient strength utilization of composite pipes still exists; (2) The overall stiffness of the truss composed of the spatial connection structure has not been improved from the material point of view. The method of improving the overall stiffness of the truss is more dependent on increasing the height of the truss, which is not conducive to making the structure lightweight; (3) The nodes of the spatial connection structure are rigid connections. Each rod of the truss will be subjected to a certain bending moment, and the compressed composite pipe is prone to buckling. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an FRP tube lightweight concrete truss beam which improves the overall bending rigidity, is conducive to fully utilizing the strength of each FRP tube, is convenient for overall assembly and has high construction efficiency.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] An FRP tube lightweight concrete truss beam comprises three parallel and non-coplanar longitudinal beam bodies, which are respectively recorded as a first longitudinal beam body, a second longitudinal beam body and a third longitudinal beam body, each of which is composed of longitudinal FRP tubes and connecting balls alternately spliced ​​along a straight line, both ends of each longitudinal beam body are connecting balls, the connecting balls of the first longitudinal beam body and the second longitudinal beam body are arranged one by one, and the corresponding two connecting balls are connected by a transverse FRP tube, so that a plurality of quadrilateral areas are enclosed between the first longitudinal beam body and the second longitudinal beam body; the plane where the first longitudinal beam body and the second longitudinal beam body are located The plane is set as a reference plane, the projections of the connecting balls of the third longitudinal beam on the reference plane are respectively located in each quadrilateral area, the connecting balls of the third longitudinal beam are connected to the connecting balls at the four corners of the corresponding quadrilateral area through oblique FRP tubes, and both ends of each of the longitudinal beams, transverse FRP tubes and oblique FRP tubes are provided with plugging components, and the plugging components are detachably connected to the corresponding connecting balls through connecting components, and the interiors of the longitudinal FRP tubes of at least the first longitudinal beam and the second longitudinal beam are poured with lightweight concrete, and the two ends of the lightweight concrete are respectively pressed against the corresponding plugging components.

[0009] As a further improvement of the above technical solution:

[0010] The sealing assembly includes an inner support body and an outer hoop body, the inner support body is sealed inside the longitudinal FRP tube, the outer hoop body is sleeved outside the longitudinal FRP tube, the end of the longitudinal FRP tube is pressed between the inner support body and the outer hoop body, and the inner support body or the outer hoop body is detachably connected to the corresponding connecting ball through a connecting assembly.

[0011] The inner support body is interference fit with the longitudinal FRP tube.

[0012] The radial pre-tightening force between the outer hoop body and the longitudinal FRP tube is formed by the radial external supporting force of the inner supporting body on the longitudinal FRP tube.

[0013] The inner support body is in a columnar shape, and the outer hoop body is in a hollow columnar shape.

[0014] The inner support body and the outer hoop body are both made of aluminum alloy.

[0015] The connecting assembly comprises a movable joint and a bolt, wherein the movable joint is threadedly connected to the outer hoop body, one end of the bolt is sleeved in the movable joint, the other end is threadedly connected to the corresponding connecting ball, and is tightened between the movable joint and the connecting ball.

[0016] One end of the outer hoop body is provided with a sleeve hole and the other end is provided with a threaded hole. The sleeve hole is clamped on the longitudinal FRP pipe, the threaded hole is threadedly connected with the movable joint, and the bolt sleeve is provided with a washer, which is tightly pressed between the movable joint and the connecting ball.

[0017] The FRP tube lightweight concrete truss beam has a symmetrical structure.

[0018] A construction method of an FRP tube lightweight concrete truss beam comprises the following steps:

[0019] S1. Making a longitudinal FRP tube filled with lightweight concrete: first, plug one end of the longitudinal FRP tube with a plugging assembly, then pour lightweight concrete into the longitudinal FRP tube from the other end of the longitudinal FRP tube, then plug the other end of the longitudinal FRP tube with a plugging assembly, and allow the lightweight concrete to solidify and press against the plugging assemblies at both ends of the longitudinal FRP tube;

[0020] S2, assembling to form a longitudinal beam: alternately connecting the connecting balls and the longitudinal FRP tubes poured with lightweight concrete through the connecting assembly to form a first longitudinal beam and a second longitudinal beam; alternately connecting the connecting balls and the longitudinal FRP tubes through the connecting assembly to form a third longitudinal beam; both ends of each longitudinal beam are connected by connecting balls;

[0021] S3, assembling the first two longitudinal beams: arranging the first longitudinal beam and the second longitudinal beam in parallel, arranging the connection balls of the first longitudinal beam and the second longitudinal beam in one-to-one correspondence, connecting the two corresponding connection balls through a transverse FRP tube, so that a plurality of quadrilateral areas are enclosed between the first longitudinal beam and the second longitudinal beam; the plane where the first longitudinal beam and the second longitudinal beam are located is set as a reference plane;

[0022] S4. Assemble the third longitudinal beam: make the projections of the connection balls of the third longitudinal beam on the reference plane be located in the respective quadrilateral regions, and connect the connection balls of the third longitudinal beam to the connection balls at the four corners of the quadrilateral region through oblique FRP tubes.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The FRP tube lightweight concrete truss beam of the present invention has the following characteristics: first, lightweight concrete is poured into the longitudinal FRP tubes of at least two longitudinal beam bodies, and the two ends of the lightweight concrete are pressed tightly by the plugging components at the two ends of the longitudinal FRP tubes, thereby improving the overall bending stiffness of the longitudinal FRP tubes, so that the FRP material strength of the longitudinal FRP tubes can be fully utilized (the longitudinal FRP tubes will not be bent before the material strength is fully utilized); second, the overall structural arrangement and the strengthening effect of the lightweight concrete pouring improve the overall bending stiffness of the truss beam, and when the deflection of the truss reaches the standard limit, the ultimate strength of the FRP can be exerted by at least 60%, which is conducive to fully utilizing the strength of each FRP tube, so that the original overall design concept of the truss beam controlled by the stiffness of the FRP material tube can be adjusted to the overall design concept controlled by the strength of the FRP material tube; third, the overall assembly is convenient, which improves the construction efficiency.

[0025] The construction method of the FRP tube lightweight concrete truss beam of the present invention has reasonable step sequence design and high overall construction efficiency. In addition, the construction method of the FRP tube lightweight concrete truss beam is a unique construction method for FRP tube lightweight concrete truss beams, and can obtain FRP tube lightweight concrete truss beams with the following advantages: first, lightweight concrete is poured into the longitudinal FRP tubes of at least two longitudinal beam bodies, and the two ends of the lightweight concrete are pressed tightly by the plugging components at the two ends of the longitudinal FRP tubes, thereby improving the overall bending stiffness of the longitudinal FRP tubes, so that the FRP material strength of the longitudinal FRP tubes can be fully utilized (the longitudinal FRP tubes will not be bent before the material strength is fully exerted); second, the overall structural layout and the strengthening effect of lightweight concrete pouring improve the overall bending stiffness of the truss beam. When the deflection of the truss reaches the standard limit, the ultimate strength of FRP can be exerted by at least 60%, which is conducive to fully utilizing the strength of each FRP tube, so that the original overall design concept of the truss beam controlled by the stiffness of the FRP material tube can be adjusted to the overall design concept controlled by the strength of the FRP material tube; third, the overall assembly is convenient, which improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the FRP tube lightweight concrete truss beam of the present invention.

[0027] Figure 2 The invention discloses a decomposition of a plugging assembly and a connecting assembly of a FRP tube lightweight concrete truss beam. Figure 1 .

[0028] Figure 3 The invention discloses a decomposition of a plugging assembly and a connecting assembly of a FRP tube lightweight concrete truss beam. Figure 2 .

[0029] The symbols in the figure represent:

[0030] 1. Longitudinal beam; 11. First longitudinal beam; 12. Second longitudinal beam; 13. Third longitudinal beam; 2. Longitudinal FRP tube; 3. Connecting ball; 4. Transverse FRP tube; 5. Quadrilateral area; 6. Oblique FRP tube; 7. Lightweight concrete; 8. Sealing assembly; 81. Inner support body; 82. Outer hoop body; 821. Socket hole; 822. Threaded hole; 9. Connecting assembly; 91. Movable joint; 92. Bolt; 93. Washer. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] Figures 1 to 3An embodiment of the FRP tube lightweight concrete truss beam of the present invention is shown. The FRP tube lightweight concrete truss beam of this embodiment includes three parallel and non-coplanar longitudinal beam bodies 1, which are respectively recorded as the first longitudinal beam body 11, the second longitudinal beam body 12 and the third longitudinal beam body 13. Each longitudinal beam body 1 is composed of longitudinal FRP tubes 2 and connecting balls 3 alternately spliced ​​along a straight line. Both ends of each longitudinal beam body 1 are connecting balls 3. The connecting balls 3 of the first longitudinal beam body 11 and the second longitudinal beam body 12 are arranged one by one. The corresponding two connecting balls 3 are connected by a transverse FRP tube 4, so that a plurality of quadrilateral areas 5 are enclosed between the first longitudinal beam body 11 and the second longitudinal beam body 12; the first longitudinal beam The plane where the body 11 and the second longitudinal beam body 12 are located is set as a reference plane, and the projections of each connecting ball 3 of the third longitudinal beam body 13 on the reference plane are respectively located in each quadrilateral area 5, and the connecting ball 3 of the third longitudinal beam body 13 is connected to the connecting balls 3 at the four corners of the corresponding quadrilateral area 5 through oblique FRP tubes 6 respectively. Both ends of each longitudinal beam body 1, transverse FRP tube 4 and oblique FRP tube 6 are provided with a plugging component 8, and the plugging component 8 is detachably connected to the corresponding connecting ball 3 through a connecting component 9. At least the interior of each longitudinal FRP tube 2 of the first longitudinal beam body 11 and the second longitudinal beam body 12 is poured with lightweight concrete 7, and the two ends of the lightweight concrete 7 are respectively pressed against the corresponding plugging components 8.

[0037] The assembly and construction process of this FRP tube lightweight concrete truss beam:

[0038] First, a longitudinal FRP tube 2 with lightweight concrete 7 poured inside is manufactured: first, one end of the longitudinal FRP tube 2 is sealed by a plugging assembly 8, and then the lightweight concrete 7 is poured into the longitudinal FRP tube 2 from the other end of the longitudinal FRP tube 2, and then the other end of the longitudinal FRP tube 2 is sealed by the plugging assembly 8, and the lightweight concrete 7 is made to be tightly pressed between the plugging assemblies 8 at both ends of the longitudinal FRP tube 2 after solidification;

[0039] Secondly, assemble to form the longitudinal beam body 1: alternately connect the connecting balls 3 and the longitudinal FRP tubes 2 poured with lightweight concrete 7 through the connecting assembly 9 to form the first longitudinal beam body 11 and the second longitudinal beam body 12; alternately connect the connecting balls 3 and the longitudinal FRP tubes 2 through the connecting assembly 9 to form the third longitudinal beam body 13; both ends of each longitudinal beam body 1 are connected with connecting balls 3;

[0040] Then, assemble the first two longitudinal beams 1: arrange the first longitudinal beam 11 and the second longitudinal beam 12 in parallel, arrange the connection balls 3 of the first longitudinal beam 11 and the second longitudinal beam 12 in one-to-one correspondence, connect the two corresponding connection balls 3 through the transverse FRP tube 4, so that a plurality of quadrilateral areas 5 are enclosed between the first longitudinal beam 11 and the second longitudinal beam 12; the plane where the first longitudinal beam 11 and the second longitudinal beam 12 are located is set as a reference plane;

[0041] Finally, assemble the third longitudinal beam 13: make the projections of the connecting balls 3 of the third longitudinal beam 13 on the reference plane located in the quadrilateral areas 5 respectively, and connect the connecting balls 3 of the third longitudinal beam 13 to the connecting balls 3 at the four corners of the quadrilateral area 5 respectively through the oblique FRP tubes 6.

[0042] The FRP tube lightweight concrete truss beam has the following characteristics: first, lightweight concrete 7 is poured into the longitudinal FRP tubes 2 of at least two longitudinal beam bodies 1, and the two ends of the lightweight concrete 7 are pressed tightly by the plugging components 8 at the two ends of the longitudinal FRP tubes 2, thereby improving the overall bending stiffness of the longitudinal FRP tubes 2, so that the FRP material strength of the longitudinal FRP tubes 2 can be fully utilized (the longitudinal FRP tubes 2 will not be bent before the material strength is fully utilized); second, the overall structural arrangement and the strengthening effect of the lightweight concrete 7 pouring improve the overall bending stiffness of the truss beam. When the deflection of the truss reaches the standard limit, the ultimate strength of FRP can be exerted by at least 60%, which is conducive to fully utilizing the strength of each FRP tube, so that the original overall design concept of the truss beam controlled by the stiffness of the FRP material tube can be adjusted to the overall design concept controlled by the strength of the FRP material tube; third, the overall assembly is convenient, which improves the construction efficiency.

[0043] Furthermore, if Figure 2 and Figure 3 As shown, in this embodiment, the sealing assembly 8 includes an inner support body 81 and an outer hoop body 82. The inner support body 81 is sealed in the longitudinal FRP tube 2, and the outer hoop body 82 is sleeved outside the longitudinal FRP tube 2. The end of the longitudinal FRP tube 2 is tightly pressed between the inner support body 81 and the outer hoop body 82. The inner support body 81 or the outer hoop body 82 is detachably connected to the corresponding connecting ball 3 through the connecting assembly 9.

[0044] In the process of manufacturing the longitudinal FRP tube 2 with the lightweight concrete 7 poured inside, the two ends of the longitudinal FRP tube 2 are blocked by first inserting the inner support body 81 into the longitudinal FRP tube 2, and then sleeved the outer hoop body 82 outside the longitudinal FRP tube 2, so that the end of the longitudinal FRP tube 2 is tightly pressed between the inner support body 81 and the outer hoop body 82. The blocking assembly 8 has a simple structure, is easy to operate, and has high blocking construction efficiency.

[0045] Furthermore, in this embodiment, the inner support body 81 is interference fit with the longitudinal FRP tube 2, so that the sealing part has good sealing performance. Furthermore, the outer hoop body 82 is threadedly connected with the longitudinal FRP tube 2, which improves the connection strength of the sealing part and the convenience of construction, and when the deflection of the truss reaches the standard limit, the ultimate strength of FRP can be better exerted, which can reach more than 80%, which is more conducive to fully utilizing the strength of each FRP tube.

[0046] Furthermore, in this embodiment, the radial preload force between the outer hoop body 82 and the longitudinal FRP tube 2 is formed by the radial external support force of the inner support body 81 on the longitudinal FRP tube 2. This improves the sealing performance between the inner support body 81 and the longitudinal FRP tube 2, and also improves the connection strength between the outer hoop body 82 and the longitudinal FRP tube 2.

[0047] Furthermore, in this embodiment, the inner support body 81 is columnar, and the outer hoop body 82 is hollow columnar. On the one hand, the columnar structure is easy to process, and on the other hand, the columnar structure has good aesthetics. The inner support body 81 can be as follows Figure 2 The solid structure shown can also be Figure 3 The inner end hollow structure is shown.

[0048] Furthermore, in this embodiment, the inner support body 81 and the outer hoop body 82 are both made of aluminum alloy. Aluminum alloy is light in weight and easy to construct.

[0049] Furthermore, if Figure 2 and Figure 3 As shown, in this embodiment, the connection assembly 9 includes a movable joint 91 and a bolt 92, the movable joint 91 is threadedly connected to the outer hoop body 82, one end of the bolt 92 is sleeved in the movable joint 91, and the other end is threadedly connected to the corresponding connection ball 3, and is tightened between the movable joint 91 and the connection ball 3. The connection process of the connection assembly 9, the plugging assembly 8 and the connection ball 3 is to first sleeve the movable joint 91 and the bolt 92, then thread the movable joint 91 to the outer hoop body 82, and the bolt 92 to the corresponding connection ball 3. By threading both ends of the connection assembly 9, it is convenient to screw the connection assembly 9 to tighten the FRP pipe, and it is also convenient to disassemble and assemble.

[0050] Further, in this embodiment, one end of the outer hoop body 82 is provided with a sleeve hole 821, and the other end is provided with a threaded hole 822, the sleeve hole 821 is clamped on the longitudinal FRP tube 2, the threaded hole 822 is threadedly connected with the movable joint 91, and a washer 93 is provided on the outer sleeve of the bolt 92, and the washer 93 is pressed between the movable joint 91 and the connecting ball 3. Preferably, the sleeve hole 821 and the threaded hole 822 are coaxial. Further, the sleeve hole 821 is connected with the threaded hole 822, and the aperture of the sleeve hole 821 is larger than that of the threaded hole 822.

[0051] Furthermore, in this embodiment, the FRP tube lightweight concrete truss beam has a symmetrical structure. The overall load-bearing capacity, bending stiffness and strength of the symmetrical structure are good, which further helps to fully utilize the strength of each FRP tube.

[0052] Preferably, the longitudinal FRP tubes 2 of the third longitudinal beam body 13 are not poured with lightweight concrete 7 .

[0053] Preferably, the transverse FRP tubes 4 are not poured with lightweight concrete 7 .

[0054] Preferably, each oblique FRP tube 6 connected by the connecting balls 3 at both ends of the third longitudinal beam body 13 is poured with lightweight concrete 7. Among the four oblique FRP tubes 6 corresponding to the connecting balls 3 located in the middle of the third longitudinal beam body 13, two oblique FRP tubes 6 on one side are poured with lightweight concrete 7, and two oblique FRP tubes 6 on the other side are not poured with lightweight concrete 7. Scientifically selecting FRP tubes to be poured with lightweight concrete 7 instead of pouring all of them with lightweight concrete 7 is conducive to improving the overall bending strength without making the overall weight too heavy.

[0055] Embodiment 2:

[0056] A construction method of an FRP tube lightweight concrete truss beam comprises the following steps:

[0057] S1. Making a longitudinal FRP tube 2 filled with lightweight concrete 7: first, plugging one end of the longitudinal FRP tube 2 with a plugging assembly 8, then pouring lightweight concrete 7 into the longitudinal FRP tube 2 from the other end of the longitudinal FRP tube 2, then plugging the other end of the longitudinal FRP tube 2 with the plugging assembly 8, and making the lightweight concrete 7 close to the plugging assemblies 8 at both ends of the longitudinal FRP tube 2 after solidification;

[0058] S2, assembling to form the longitudinal beam body 1: alternately connecting the connecting balls 3 and the longitudinal FRP tubes 2 poured with lightweight concrete 7 through the connecting assembly 9 to form the first longitudinal beam body 11 and the second longitudinal beam body 12; alternately connecting the connecting balls 3 and the longitudinal FRP tubes 2 through the connecting assembly 9 to form the third longitudinal beam body 13; both ends of each longitudinal beam body 1 are connected with connecting balls 3;

[0059] S3, assembling the first two longitudinal beams 1: arranging the first longitudinal beam 11 and the second longitudinal beam 12 in parallel, and arranging the connection balls 3 of the first longitudinal beam 11 and the second longitudinal beam 12 in one-to-one correspondence, connecting the two corresponding connection balls 3 through the transverse FRP tube 4, so that a plurality of quadrilateral areas 5 are enclosed between the first longitudinal beam 11 and the second longitudinal beam 12; the plane where the first longitudinal beam 11 and the second longitudinal beam 12 are located is set as a reference plane;

[0060] S4. Assemble the third longitudinal beam 13: make the projections of the connecting balls 3 of the third longitudinal beam 13 on the reference plane located in the quadrilateral areas 5 respectively, and connect the connecting balls 3 of the third longitudinal beam 13 to the connecting balls 3 at the four corners of the quadrilateral area 5 respectively through the oblique FRP tubes 6.

[0061] The construction method of the FRP tube lightweight concrete truss beam has a reasonable step sequence design and high overall construction efficiency. In addition, the construction method of the FRP tube lightweight concrete truss beam is a unique construction method for the FRP tube lightweight concrete truss beam, and can obtain the FRP tube lightweight concrete truss beam with the following advantages: first, lightweight concrete 7 is poured into the longitudinal FRP tubes 2 of at least two longitudinal beam bodies 1, and the two ends of the lightweight concrete 7 are pressed tightly by the plugging components 8 at the two ends of the longitudinal FRP tubes 2, thereby improving the overall bending stiffness of the longitudinal FRP tubes 2, so that the FRP material strength of the longitudinal FRP tubes 2 can be fully utilized (the longitudinal FRP tubes 2 will not be bent before the material strength is fully exerted); second, the overall structural arrangement and the strengthening effect of the pouring of lightweight concrete 7 improve the overall bending stiffness of the truss beam. When the deflection of the truss reaches the standard limit, the ultimate strength of FRP can be exerted by at least 60%, which is conducive to fully utilizing the strength of each FRP tube, so that the original overall design concept of the truss beam controlled by the stiffness of the FRP material tube can be adjusted to the overall design concept controlled by the strength of the FRP material tube; third, the overall assembly is convenient, which improves the construction efficiency.

[0062] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A FRP tube lightweight concrete truss beam, characterized in that: The invention comprises three parallel and non-coplanar longitudinal beams (1), which are respectively denoted as a first longitudinal beam (11), a second longitudinal beam (12) and a third longitudinal beam (13). The first longitudinal beam (11), the second longitudinal beam (12) and the third longitudinal beam (13) are all composed of longitudinal FRP tubes (2) and connecting balls (3) spliced ​​alternately along a straight line. Both ends of each longitudinal beam (1) are connecting balls (3). The connecting balls (3) of the first longitudinal beam (11) and the second longitudinal beam (12) are arranged one by one. The corresponding two connecting balls (3) are connected by a transverse FRP tube. The first longitudinal beam (11) and the second longitudinal beam (12) are connected by a P tube (4) so ​​that a plurality of quadrilateral regions (5) are enclosed between the first longitudinal beam (11) and the second longitudinal beam (12); the plane where the first longitudinal beam (11) and the second longitudinal beam (12) are located is set as a reference plane, and the projections of the connection balls (3) of the third longitudinal beam (13) on the reference plane are respectively located in the quadrilateral regions (5), and the connection balls (3) of the third longitudinal beam (13) are respectively connected to the connection balls (3) at the four corners of the corresponding quadrilateral regions (5) through oblique FRP tubes (6), and each of the longitudinal beams (1), the transverse FRP tubes (4) Both ends of the inclined FRP tube (6) are provided with a plugging assembly (8), the plugging assembly (8) being detachably connected to the corresponding connecting ball (3) via a connecting assembly (9), the interior of each longitudinal FRP tube (2) of at least the first longitudinal beam body (11) and the second longitudinal beam body (12) being poured with lightweight concrete (7), the two ends of the lightweight concrete (7) being respectively pressed against the corresponding plugging assembly (8); the plugging assembly (8) comprising an inner support body (81) and an outer hoop body (82), the inner support body (81) being sealed in the longitudinal FRP tube (2), the outer hoop body (82) being sleeved Outside the longitudinal FRP tube (2), the end of the longitudinal FRP tube (2) is tightly pressed between an inner support body (81) and an outer hoop body (82), and the inner support body (81) or the outer hoop body (82) is detachably connected to a corresponding connection ball (3) through a connection assembly (9); the connection assembly (9) comprises a movable joint (91) and a bolt (92), the movable joint (91) is threadedly connected to the outer hoop body (82), one end of the bolt (92) is sleeved in the movable joint (91), the other end is threadedly connected to the corresponding connection ball (3), and is tightened between the movable joint (91) and the connection ball (3).

2. The FRP tube lightweight concrete truss beam according to claim 1, characterized in that: The inner support body (81) is interference fit with the longitudinal FRP tube (2).

3. The FRP tube lightweight concrete truss beam according to claim 2, characterized in that: The radial pre-tightening force between the outer hoop body (82) and the longitudinal FRP tube (2) is formed by the radial external supporting force of the inner supporting body (81) on the longitudinal FRP tube (2).

4. The FRP tube lightweight concrete truss beam according to claim 3, characterized in that: The inner support body (81) is in the shape of a column, and the outer hoop body (82) is in the shape of a hollow column.

5. The FRP tube lightweight concrete truss beam according to claim 3, characterized in that: The inner support body (81) and the outer hoop body (82) are both made of aluminum alloy.

6. The FRP tube lightweight concrete truss beam according to claim 1, characterized in that: The outer hoop body (82) is provided with a sleeve hole (821) at one end and a threaded hole (822) at the other end; the sleeve hole (821) is clamped tightly on the longitudinal FRP tube (2); the threaded hole (822) is threadedly connected to the movable joint (91); a washer (93) is provided on the outer sleeve of the bolt (92); the washer (93) is pressed tightly between the movable joint (91) and the connecting ball (3).

7. The FRP tube lightweight concrete truss beam according to any one of claims 1 to 6, characterized in that: The FRP tube lightweight concrete truss beam has a symmetrical structure.

8. A construction method for the FRP tube lightweight concrete truss beam according to any one of claims 1 to 7, characterized in that: The steps include: S1. Manufacturing a longitudinal FRP tube (2) filled with lightweight concrete (7): first, sealing one end of the longitudinal FRP tube (2) with a plugging component (8), then pouring lightweight concrete (7) into the longitudinal FRP tube (2) from the other end of the longitudinal FRP tube (2), then sealing the other end of the longitudinal FRP tube (2) with the plugging component (8), and allowing the lightweight concrete (7) to be pressed tightly between the plugging components (8) at both ends of the longitudinal FRP tube (2) after solidification; S2, assembling to form a longitudinal beam body (1): alternately connecting the connecting balls (3) and the longitudinal FRP tubes (2) poured with lightweight concrete (7) through a connecting assembly (9) to form a first longitudinal beam body (11) and a second longitudinal beam body (12); alternately connecting the connecting balls (3) and the longitudinal FRP tubes (2) through a connecting assembly (9) to form a third longitudinal beam body (13); both ends of each longitudinal beam body (1) are connecting balls (3); S3, assembling the first two longitudinal beams (1): arranging the first longitudinal beam (11) and the second longitudinal beam (12) in parallel, arranging the connection balls (3) of the first longitudinal beam (11) and the second longitudinal beam (12) in one-to-one correspondence, connecting the two corresponding connection balls (3) through a transverse FRP tube (4), so that a plurality of quadrilateral regions (5) are enclosed between the first longitudinal beam (11) and the second longitudinal beam (12); the plane where the first longitudinal beam (11) and the second longitudinal beam (12) are located is set as a reference plane; S4. Assembling the third longitudinal beam (13): the projections of the connection balls (3) of the third longitudinal beam (13) on the reference plane are located within the quadrilateral regions (5), respectively, and the connection balls (3) of the third longitudinal beam (13) are connected to the connection balls (3) at the four corners of the quadrilateral region (5) through the oblique FRP tubes (6).

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