Detachable reinforced compression rod piece at support end of grid structure and preparation method of detachable reinforced compression rod piece

Abstract

The invention discloses a detachable reinforced compression rod piece for a support end of a grid structure and a preparation method of the detachable reinforced compression rod piece. The detachable reinforced compression rod piece comprises a first-section pipe, a second-section pipe and a third-section pipe, wherein at least one pair of first hoops is arranged at the end of the first-section pipe; at least one pair of second hoops is arranged at the end part of the second pipe section; at least one first convex ring and at least one second convex ring are formed on the sleeve; the sleeve sleeves the end part of the first section pipe and the end part of the second section pipe; the first convex rings are positioned between two adjacent first hoops; and the second convex rings are positioned between the two adjacent second hoops. The total length of the first section pipe and the second section pipe is close to that of an existing slender rod piece, the buckling bearing capacity of the first section pipe is superior to that of the existing slender rod piece, and the buckling bearing capacity of the second section pipe is superior to that of the existing slender rod piece. And the thickened sleeve provides additional rigidity for the detachable reinforced compression rod piece, so that the buckling resistance of the detachable reinforced compression rod piece is further effectively enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of grid structures, and in particular to a detachable reinforced compression rod at a support end of a grid structure and a preparation method thereof. Background Art

[0002] As a typical large-span spatial structure, grid structure is widely used in public infrastructure with large spans and large column networks due to its excellent stress-bearing performance, strong spatial extension ability and good economic benefits. In view of the high redundancy of large-span spatial structures, it was previously believed that the damage and failure of individual rods would have little effect on the bearing capacity of the structure, let alone cause continuous collapse. However, many actual engineering accidents have shown that although the structure has a high number of statically indeterminate times, continuous collapse is also a major hidden danger in large-span spatial structures, especially for grid structures commonly used in large-scale public building facilities in cities. Once a collapse accident occurs, it will inevitably be accompanied by greater economic and public safety costs.

[0003] The diagonal braces at the support end play an important role in the load-bearing and anti-collapse process of this type of grid structure. Many studies have shown that the occurrence of compressive buckling is often the beginning of the continuous collapse of the grid. Therefore, improving its compressive buckling bearing capacity is an important research topic to ensure the safety of grid structures. Existing methods are mostly to increase the cross-section of the rod or improve the material strength. The compressive buckling bearing capacity of the rods in the grid structure still needs to be further improved.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a detachable reinforced compression rod at the support end of a truss structure and a preparation method thereof are provided, aiming to solve the problem that the compressive buckling bearing capacity of the rods in the prior art truss structure still needs to be further improved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] A detachable reinforced compression rod at the support end of a grid structure, comprising:

[0008] A first section of pipe, wherein at least one pair of first hoops are provided at the end of the first section of pipe;

[0009] a second pipe section, wherein at least one pair of second ferrules are provided at the end of the second pipe section;

[0010] a sleeve formed with at least one first protruding ring and at least one second protruding ring;

[0011] Wherein, the sleeve is sleeved on the end of the first section of the pipe and the end of the second section of the pipe;

[0012] The first convex ring is located between two adjacent first hoops;

[0013] The second protruding ring is located between two adjacent second hoops.

[0014] The detachable reinforced compression rod at the support end of the grid structure, wherein there is a gap between the end of the first section of the tube and the end of the second section of the tube.

[0015] The detachable reinforced compression rod at the support end of the grid structure, wherein the sleeve comprises: two half pieces, and the two half pieces are connected by a connecting piece.

[0016] The removable reinforced compression rod at the support end of the grid structure, wherein the half piece comprises:

[0017] An arc-shaped portion, wherein the inner side of the arc-shaped portion forms at least one first half ring and at least one second half ring;

[0018] Two outward extensions are formed at two ends of the arc-shaped portion respectively;

[0019] Wherein, a via hole is formed on the protruding portion, and the connecting member is passed through and connected to the via hole;

[0020] The first half rings of the two half sheets are put together to form the first convex ring;

[0021] The second half rings of the two half sheets are put together to form the second convex ring.

[0022] The detachable reinforced compression rod at the support end of the grid structure, wherein the connecting member is a bolt; the thickness of the arc portion and the thickness of the extending portion are both the same as the thickness of the first section of the tube; the sum of the length of the first section of the tube and the length of the second section of the tube is the tube length, and the ratio of the length of the half piece to the tube length is 1 to 2:10.

[0023] The detachable reinforced compression rod at the support end of the grid structure, wherein the first section of the pipe and the second section of the pipe are both made of steel pipes; the sleeve is made of a steel cylinder; the first hoop and the second hoop are both made of steel hoops.

[0024] The detachable reinforced compression rod at the support end of the grid structure, wherein the first hoop is welded to the first section of the pipe on a side away from the first convex ring, the first hoop forms a first guide surface on a side facing the first convex ring, and the first convex ring forms a first chamfer on a side facing the first hoop;

[0025] The side of the second hoop facing away from the second convex ring is welded to the second pipe section, the side of the second hoop facing the second convex ring forms a second guide surface, and the side of the second convex ring facing the second hoop forms a second chamfer.

[0026] The detachable reinforced compression rod at the support end of the grid structure, wherein the outer diameter of the first section of the pipe and the outer diameter of the second section of the pipe are both 100mm to 130mm;

[0027] The length of the first hoop and the length of the second hoop are both 40 mm to 100 mm;

[0028] The length of the first convex ring and the length of the second convex ring are both 80 mm to 120 mm;

[0029] The thickness of the first hoop, the thickness of the second hoop, the thickness of the first convex ring, and the thickness of the second convex ring are all 6 mm to 10 mm.

[0030] A method for preparing a detachable reinforced compression rod at a support end of a grid structure as described in any one of the above, comprising the steps of:

[0031] Determine the size of the first hoop, the size of the second hoop and the size of the sleeve according to the size of the rod to be strengthened, and prepare the first hoop, the second hoop and the sleeve;

[0032] Removing a section of the rod to be strengthened to form a first section of the tube and a second section of the tube;

[0033] Connecting the first ferrule to the end of the first pipe section, and connecting the second ferrule to the end of the second ferrule;

[0034] The sleeve is sleeved on the end of the first section of the pipe and the end of the second section of the pipe, wherein the first convex ring is located between two adjacent first hoops, and the second convex ring is located between two adjacent second hoops.

[0035] The method for preparing the detachable reinforced compression rod at the support end of the grid structure, wherein the size of the rod to be reinforced includes: the length of the rod to be reinforced, the thickness of the rod to be reinforced and the outer diameter of the rod to be reinforced; the size of the first hoop includes: the length of the first hoop, the thickness of the first hoop and the inner diameter of the first hoop; the size of the second hoop includes: the length of the second hoop, the thickness of the second hoop and the inner diameter of the second hoop; the size of the sleeve includes: the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring and the thickness of the second convex ring;

[0036] The method of determining the size of the first hoop, the size of the second hoop and the size of the sleeve according to the size of the rod to be strengthened, and preparing the first hoop, the second hoop and the sleeve comprises:

[0037] Based on the length of the to-be-strengthened member, the thickness of the to-be-strengthened member, and the outer diameter of the to-be-strengthened member, a model of the detachable and strengthened compression member is constructed and optimized so that the performance parameters of the optimized model of the detachable and strengthened compression member reach target performance parameters; the performance parameters include: at least one of an eigenvalue buckling load and a nonlinear buckling load;

[0038] Based on the optimized model of the detachable reinforced compression rod, determine the length of the first hoop, the length of the second hoop, the thickness of the first hoop, the thickness of the second hoop, the inner diameter of the first hoop, the inner diameter of the second hoop, the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring;

[0039] preparing a first hoop according to the length of the first hoop, the thickness of the first hoop and the inner diameter of the first hoop;

[0040] preparing a second hoop according to the length of the second hoop, the thickness of the second hoop and the inner diameter of the second hoop;

[0041] A sleeve is prepared according to the length of the half piece, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring.

[0042] Beneficial effect: The total length of the first section of the tube and the second section of the tube is close to that of the existing slender rod, the buckling bearing capacity of the first section of the tube is better than that of the existing slender rod, and the buckling bearing capacity of the second section of the tube is better than that of the existing slender rod. The thickened sleeve provides additional rigidity for the detachable reinforced compression rod, thereby further effectively enhancing the anti-buckling capacity of the detachable reinforced compression rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is the first exploded view of the detachable reinforced compression rod in the embodiment of the present invention.

[0044] Figure 2 yes Figure 1 Enlarged view of the middle sleeve.

[0045] Figure 3 1 is a first structural schematic diagram of a sleeve in an embodiment of the present invention.

[0046] Figure 4 It is a second exploded view of the detachable reinforced compression rod in the embodiment of the present invention.

[0047] Figure 5Schematic diagram of the structure of a half piece in an embodiment of the present invention.

[0048] Figure 6 Schematic diagram of the structure of the end of the first tube section and the end of the second tube section in an embodiment of the present invention.

[0049] Figure 7 It is the third exploded view of the detachable reinforced compression rod in the embodiment of the present invention.

[0050] Figure 8 2 is a second structural schematic diagram of the sleeve in an embodiment of the present invention.

[0051] Fig. 9 It is a fourth exploded view of the detachable reinforced compression rod in the embodiment of the present invention.

[0052] Fig.10 Schematic diagram of a model of a detachable reinforced compression rod in an embodiment of the present invention.

[0053] Fig.11 3 is a comparison diagram of the characteristic value buckling load of the unreinforced (a) and reinforced (b) rods in an embodiment of the present invention.

[0054] Fig.12 It is a comparison diagram of nonlinear buckling load-displacement curves of an unreinforced rod and a reinforced rod in an embodiment of the present invention.

[0055] Fig.13 It is a simulation diagram of the unreinforced rod bending in an embodiment of the present invention.

[0056] Fig.14 It is a simulation diagram of the reinforced rod member being bent in the embodiment of the present invention.

[0057] Description of reference numerals:

[0058] 10. First section of the tube; 20. Second section of the tube; 31. First ferrule; 311. First guide surface; 32. Second ferrule; 321. Second guide surface; 40. Sleeve; 41. First convex ring; 411. First half ring; 412. First chamfer; 42. Second convex ring; 421. Second half ring; 422. Second chamfer; 4a. Half sheet; 4a1. Arc-shaped portion; 4a2. Overhanging portion; 4a21. Through hole; 4b. Connector. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0060] Please also see Figure 1-Figure 14The present invention provides some embodiments of detachable reinforced compression rods at the support ends of a grid structure.

[0061] like Figure 1-Figure 2 As shown, the detachable reinforced compression rod at the support end of the grid structure of the present invention comprises:

[0062] A first pipe section 10, wherein at least one pair of first ferrules 31 are provided at the end of the first pipe section 10;

[0063] A second pipe section 20, wherein at least one pair of second ferrules 32 are provided at the end of the second pipe section 20;

[0064] The sleeve 40 is formed with at least one first protruding ring 41 and at least one second protruding ring 42;

[0065] The sleeve 40 is sleeved on the end of the first tube section 10 and the end of the second tube section 20 ; the first convex ring 41 is located between two adjacent first hoops 31 ; and the second convex ring 42 is located between two adjacent second hoops 32 .

[0066] Specifically, the detachable reinforced compression rod is applied to the grid structure, for example, the detachable reinforced compression rod is connected to the support end of the grid structure, especially the diagonal web rod at the support end of the grid structure. Compared with the slender rod (especially the diagonal web rod) in the prior art, the length of the first section of the pipe 10 in the present application is shorter than the length of the existing slender rod, and the length of the second section of the pipe 20 is shorter than the length of the existing slender rod. The total length of the first section of the pipe 10 and the second section of the pipe 20 is close to the existing slender rod. The buckling bearing capacity of the first section of the pipe 10 is better than that of the existing slender rod, and the buckling bearing capacity of the second section of the pipe 20 is better than that of the existing slender rod. The sleeve 40 is sleeved on the end of the first section of the pipe 10 and the end of the second section of the pipe 20, which not only realizes the detachable connection between the first section of the pipe 10 and the second section of the pipe 20, which is convenient for dismantling and recycling, but also can further improve the buckling bearing capacity of the detachable reinforced compression rod as a whole.

[0067] In addition, the detachable reinforced compression rod of the present application can be directly prepared, or modified from an existing slender rod. For example, an existing slender rod is used as the rod to be reinforced, a small section of the rod to be reinforced is cut off to form a first section of the pipe 10 and a second section of the pipe 20, and then a sleeve 40 is added to the first section of the pipe 10 and the second section of the pipe 20 to connect the first section of the pipe 10 and the second section of the pipe 20. Figure 3 and Figure 8As shown. The existing slender rod is transformed into a removable and strengthened compressive rod. The length of the first section of the tube 10 or the length of the second section of the tube 20 refers to the length along the axial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20). The length of the first section of the tube 10 is close to the length of the second section of the tube 20. For example, the ratio of the length of the first section of the tube 10 to the length of the second section of the tube 20 is 0.9 to 1.1:1. The thickened sleeve 40 is roughly located in the middle area of ​​the removable and strengthened compressive rod (i.e., the area where the axial compressive buckling failure of the long and thin rod occurs). The thickened sleeve 40 provides additional stiffness to the middle area of ​​the removable and strengthened compressive rod, thereby further effectively enhancing the buckling resistance of the removable and strengthened compressive rod. As shown Fig.13 As shown in Figure 1, the middle region of the existing slender rod buckles. Fig.14 As shown, the detachable reinforced compression rod in the present application no longer has mid-span buckling phenomenon, but forms two sections of end-bent tubes, thereby changing the axial compression failure mode of the slender rod and improving the axial compression limit bearing capacity.

[0068] There may be two or more first hoops 31, for example, an even number of first hoops 31 may be used, two first hoops 31 form a pair of first hoops 31 and form a hoops group, each hoops group corresponds to a first convex ring 41, two first hoops 31 in the hoops group form a slot, and limit the first convex ring 41 from moving in the axial direction. There may be two or more second hoops 32, for example, an even number of second hoops 32 may be used, two second hoops 32 form a pair of second hoops 32 and form a hoops group, each hoops group corresponds to a second convex ring 42, two second hoops 32 in the hoops group form a slot, and limit the second convex ring 42 from moving in the axial direction. The stability and strength of the sleeve 40 when connecting the first section of the pipe 10 and the second section of the pipe 20 are ensured by the cooperation of the hoops and the convex ring. The cooperation connection of the hoops and the convex ring needs to have sufficient precision to avoid stress concentration or structural instability caused by installation errors.

[0069] In a preferred implementation of the embodiment of the present invention, Figure 2 , Figure 4 as well as Figure 6 As shown, there is a gap between the end of the first tube section 10 and the end of the second tube section 20 .

[0070] Specifically, the end of the first section of the pipe 10 and the end of the second section of the pipe 20 are not in direct contact, and there is a certain distance between them. When the first section of the pipe 10 or the second section of the pipe 20 is subjected to force, the end of the first section of the pipe 10 and the end of the second section of the pipe 20 will not be in direct contact, and the first section of the pipe 10 and the second section of the pipe 20 form two relatively independent pipes. Since the length of the sleeve 40 is shorter (much shorter than the length of the first section of the pipe 10 and the length of the second section of the pipe 20), the sleeve 40 is not prone to buckling and has a higher compressive resistance.

[0071] In a preferred implementation of the embodiment of the present invention, Figure 2-Figure 5 As shown, the sleeve 40 includes two half pieces 4a, and the two half pieces 4a are connected by a connecting piece 4b.

[0072] Specifically, the two half pieces 4a are connected by the connecting piece 4b after being closed, the first convex ring 41 is located between the two first hoops 31, and the second convex ring 42 is located between the two second hoops 32, thereby realizing the connection between the first section of the pipe 10 and the second section of the pipe 20. By removing the connecting piece 4b, the two half pieces 4a can be removed, thereby realizing the removal of the entire detachable reinforced compression rod. The structure of the two half pieces 4a can adopt the same structure.

[0073] In a preferred implementation of the embodiment of the present invention, Figure 2 and Figure 5 As shown, the half piece 4a comprises:

[0074] An arc-shaped portion 4a1, wherein the inner side of the arc-shaped portion 4a1 forms at least one first half ring 411 and at least one second half ring 421;

[0075] Two outwardly extending portions 4a2 are respectively formed at two ends of the arc-shaped portion 4a1;

[0076] The extending portion 4a2 is provided with a through hole 4a21 for the connecting member 4b to pass through and connect; the first half rings 411 of the two half pieces 4a are put together to form the first convex ring 41; the second half rings 421 of the two half pieces 4a are put together to form the second convex ring 42.

[0077] Specifically, the arcuate portion 4a1 is respectively adapted to the end of the first section of the pipe 10 and the end of the second section of the pipe 20. The overhanging portion 4a2 extends toward the outside of the arcuate portion 4a1, and each arcuate portion 4a1 has two overhanging portions 4a2, which are respectively located at the two ends of the arcuate portion 4a1. The overhanging portions 4a2 of the two half pieces 4a are close to each other and connected by the connecting piece 4b.

[0078] In a preferred implementation of the embodiment of the present invention, Figure 2 and Figure 4 As shown, the connecting member 4b is a bolt.

[0079] Specifically, the connecting member 4b can be a bolt, which passes through the through hole 4a21 to connect the extended portions 4a2 of the two half pieces 4a. The bolt is a high-strength bolt that can withstand large axial force and shear force, thereby enhancing the force-bearing performance of the half piece 4a.

[0080] In a preferred implementation of the embodiment of the present invention, Figure 1 and Figure 4As shown, the thickness of the arc portion 4a1 and the thickness of the extending portion 4a2 are both the same as the thickness of the first section of the tube 10; the sum of the length of the first section of the tube 10 and the length of the second section of the tube 20 is the tube length, and the ratio of the length of the half piece 4a to the tube length is 1 to 2:10.

[0081] Specifically, the thickness of the arc portion 4a1 refers to the thickness along the radial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20), and the thickness is the difference between the outer diameter and the inner diameter. The thickness of the arc portion 4a1 and the thickness of the overhanging portion 4a2 are usually greater than or equal to the thickness of the first section of the tube 10, and the thickness of the arc portion 4a1 and the thickness of the overhanging portion 4a2 are usually greater than or equal to the thickness of the second section of the tube 20. For example, the thickness of the arc portion 4a1 and the thickness of the overhanging portion 4a2 are both greater than 3 mm, which is specifically selected according to the thickness of the first section of the tube 10 or the thickness of the second section of the tube 20. The length of the half piece 4a refers to the length along the axial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20), and the length of the half piece 4a is the length of the sleeve 40, and the length of the sleeve 40 accounts for 10% to 20% of the tube length.

[0082] In a preferred implementation of the embodiment of the present invention, the first section of the pipe 10 and the second section of the pipe 20 are both made of steel pipes; the sleeve 40 is made of a steel cylinder; and the first hoop 31 and the second hoop 32 are both made of steel hoops.

[0083] Specifically, the first pipe section 10, the second pipe section 20, the sleeve 40, the first hoop 31 and the second hoop 32 can be made of steel material. The first pipe section 10 and the second pipe section 20 are steel pipes, the sleeve 40 is a steel cylinder, and the first hoop 31 and the second hoop 32 are steel hoops.

[0084] In a preferred implementation of the embodiment of the present invention, Figure 6-Figure 7 As shown, the side of the first hoop 31 facing away from the first protruding ring 41 is welded to the first section of the pipe 10 , the side of the first hoop 31 facing the first protruding ring 41 forms a first guide surface 311 , and the side of the first protruding ring 41 facing the first hoop 31 forms a first chamfer 412 .

[0085] Specifically, when the first hoop 31 and the first section of the pipe 10 are both made of steel material, the first hoop 31 and the first section of the pipe 10 can be connected by welding. A first guide surface 311 is formed on the first hoop 31, and a first chamfer 412 is formed on the first convex ring 41. The first chamfer 412 and the first guide surface 311 can be in contact. The first guide surface 311 is set outward, and the first chamfer 412 is set inward. When the sleeve 40 and the first section of the pipe 10 move relative to each other in the axial direction, the first guide surface 311 guides the first chamfer 412, converting the axial pressure of the first section of the pipe 10 into the radial pressure of the sleeve 40. Under the locking action of the connecting piece 4b, the two half pieces 4a of the sleeve 40 are not easy to be stretched apart, and the sleeve 40 is not easy to bend.

[0086] In a preferred implementation of the embodiment of the present invention, Figure 6-Figure 7 As shown, the side of the second hoop 32 facing away from the second protruding ring 42 is welded to the second section pipe 20 , the side of the second hoop 32 facing the second protruding ring 42 forms a second guide surface 321 , and the side of the second protruding ring 42 facing the second hoop 32 forms a second chamfer 422 .

[0087] Specifically, when the second hoop 32 and the second section of the pipe 20 are both made of steel, the second hoop 32 and the second section of the pipe 20 can be connected by welding. A second guide surface 321 is formed on the second hoop 32, and a second chamfer 422 is formed on the second convex ring 42, and the second chamfer 422 and the second guide surface 321 can contact each other. The second guide surface 321 is arranged outward, and the second chamfer 422 is arranged inward. When the sleeve 40 and the second section of the pipe 20 move relative to each other in the axial direction, the second guide surface 321 guides the second chamfer 422, converting the axial pressure of the second section of the pipe 20 into the radial pressure of the sleeve 40. Under the locking action of the connecting piece 4b, the two half pieces 4a of the sleeve 40 are not easy to be stretched apart, and the sleeve 40 is not easy to bend. The angle between the first guide surface 311 and the first section of the pipe 10 is an obtuse angle, for example, the obtuse angle is 110° to 130°, and can be 120°. The angle between the second guide surface 321 and the second pipe section 20 is an obtuse angle, for example, the obtuse angle is 110° to 130°, and can be 120°. The welding of the first hoop 31 and the first pipe section 10 and the welding of the second hoop 32 and the second pipe section 20 can ensure the close combination and uniform strength of the hoop and the pipe.

[0088] In a preferred implementation of the embodiment of the present invention, Fig. 9 As shown, the outer diameter of the first section of the tube 10 and the outer diameter of the second section of the tube 20 are both 100mm to 130mm; the length of the first hoop 31 and the length of the second hoop 32 are both 40mm to 100mm; the length of the first convex ring 41 and the length of the second convex ring 42 are both 80mm to 120mm.

[0089] Specifically, the length of the first hoop 31 or the length of the second hoop 32 refers to the length along the axial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20), and the length of the first convex ring 41 or the length of the second convex ring 42 refers to the length along the axial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20). The dimensions of each component in the rod are usually adjusted according to the requirements of the specific application scenario. In some application scenarios, the outer diameter of the first section of the tube 10 and the outer diameter of the second section of the tube 20 are both 100mm to 130mm, and the outer diameter of the first section of the tube 10 and the outer diameter of the second section of the tube 20 are usually equal. The length of the first hoop 31 and the length of the second hoop 32 are both 40mm to 100mm, and the lengths of each first hoop 31 can be equal or unequal; the lengths of each second hoop 32 can be equal or unequal. The length of the first protruding ring 41 is related to the distance between the two first hoops 31 on both sides of the first protruding ring 41. The position between the two first hoops 31 on both sides of the first protruding ring 41 can just accommodate the first protruding ring 41. The distance between the two first hoops 31 on both sides of the first protruding ring 41 can be equal to or slightly greater than the length of the first protruding ring 41. The length of the second protruding ring 42 is related to the distance between the two second hoops 32 on both sides of the second protruding ring 42. The position between the two second hoops 32 on both sides of the second protruding ring 42 can just accommodate the second protruding ring 42. The distance between the two second hoops 32 on both sides of the second protruding ring 42 can be equal to or slightly greater than the length of the second protruding ring 42.

[0090] In a preferred implementation of the embodiment of the present invention, Fig. 9 As shown, the thickness of the first hoop 31, the thickness of the second hoop 32, the thickness of the first convex ring 41, and the thickness of the second convex ring 42 are all 6 mm to 10 mm.

[0091] Specifically, the thickness of the first hoop 31 or the thickness of the second hoop 32 refers to the thickness along the radial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20), and the thickness of the first convex ring 41 or the thickness of the second convex ring 42 refers to the thickness along the radial direction of the tube (i.e., the first section of the tube 10 or the second section of the tube 20), and the thickness is the difference between the outer diameter and the inner diameter. The thickness of the first hoop 31 and the thickness of the first convex ring 41 are usually equal, and the thickness of the second hoop 32 and the thickness of the second convex ring 42 are usually equal. The thickness of the first hoop 31, the thickness of the second hoop 32, the thickness of the first convex ring 41, and the thickness of the second convex ring 42 can all be equal. The thickness of the first hoop 31 , the thickness of the second hoop 32 , the thickness of the first protruding ring 41 , and the thickness of the second protruding ring 42 may all be greater than the thickness of the first section of the tube 10 , and the thickness of the first hoop 31 , the thickness of the second hoop 32 , the thickness of the first protruding ring 41 , and the thickness of the second protruding ring 42 may all be greater than the thickness of the second section of the tube 20 .

[0092] The removable reinforced compression rod of the present application has the following effects:

[0093] The buckling bearing capacity is significantly improved. According to the finite element simulation results, compared with the unreinforced members, the buckling bearing capacity of the reinforced detachable reinforced compression members is greatly improved, and the compressive capacity is greatly enhanced.

[0094] Easy to disassemble and recycle. The design uses high-strength bolts for middle connection, which is easy to disassemble and convenient for later structural maintenance, recycling and reuse.

[0095] The structural stability is enhanced. The plastic development of the reinforced detachable reinforced compression rods is more uniform, and the failure mode is transformed from mid-span buckling to two-stage compression bending deformation, which improves the stability of the overall structure.

[0096] In line with the concept of circular economy. The design supports the disassembly and reuse of the structure, meets the needs of modern architecture for circular economy, and reduces resource waste.

[0097] Based on the detachable reinforced compressive rod at the support end of the grid structure described in any of the above embodiments, the present invention also provides a preferred embodiment of a method for preparing the detachable reinforced compressive rod at the support end of the grid structure:

[0098] The method for preparing the detachable reinforced compression rod at the support end of the grid structure according to the embodiment of the present invention comprises the following steps:

[0099] Step S100, determining the size of the first hoop, the size of the second hoop and the size of the sleeve according to the size of the rod to be strengthened, and preparing the first hoop, the second hoop and the sleeve;

[0100] Step S200, removing a section of the rod to be strengthened to form a first section tube and a second section tube;

[0101] Step S300, connecting the first ferrule to the end of the first pipe section, and connecting the second ferrule to the end of the second ferrule;

[0102] Step S400: Sleeve the sleeve onto the end of the first section of the pipe and the end of the second section of the pipe, wherein the first convex ring is located between two adjacent first hoops, and the second convex ring is located between two adjacent second hoops.

[0103] Specifically, the rod to be strengthened can be a rod of an existing grid structure, and the rod of the existing grid structure is transformed to obtain a detachable strengthened compression rod. According to the size of the rod to be strengthened, the size of the first hoop, the size of the second hoop and the size of the sleeve are determined, and the first hoop is prepared based on the size of the first hoop, the second hoop is prepared based on the size of the second hoop, and the sleeve is prepared based on the size of the sleeve.

[0104] A small section of the rod to be strengthened is sawed off to obtain a first section of the tube and a second section of the tube, and a gap is formed between the first section of the tube and the second section of the tube. A first hoop is connected to the end of the first section of the tube. A second hoop is connected to the end of the second section of the tube. Then a sleeve is put on the end of the first section of the tube and the end of the second section of the tube, and the first section of the tube and the second section of the tube are connected to obtain a detachable reinforced compression rod. The first convex ring is clamped between two adjacent first hoops, and the second convex ring is clamped between two adjacent second hoops. The rod to be strengthened is used as an unreinforced rod or a rod before strengthening, and the detachable reinforced compression rod is used as a rod after strengthening. The performance of the rod after strengthening is greatly improved compared with the unreinforced rod.

[0105] The dimensions of the rod to be strengthened include: the length of the rod to be strengthened, the thickness of the rod to be strengthened, and the outer diameter of the rod to be strengthened; the dimensions of the first hoop include: the length of the first hoop, the thickness of the first hoop, and the inner diameter of the first hoop; the dimensions of the second hoop include: the length of the second hoop, the thickness of the second hoop, and the inner diameter of the second hoop; the dimensions of the sleeve include: the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring. The dimensions of the rod to be strengthened include length, thickness, and outer diameter. The dimensions of the first hoop include length, thickness, and inner diameter, and the inner diameter of the first hoop is slightly larger than the outer diameter of the rod to be strengthened, so that the first hoop can be sleeved outside the rod to be strengthened. The dimensions of the second hoop include length, thickness, and inner diameter, and the inner diameter of the second hoop is slightly larger than the outer diameter of the rod to be strengthened, so that the second hoop can be sleeved outside the rod to be strengthened.

[0106] Step S100 specifically includes:

[0107] Step S110: constructing and optimizing a model of a detachable and strengthened compression member based on the length of the member to be strengthened, the thickness of the member to be strengthened, and the outer diameter of the member to be strengthened, so that the performance parameters of the optimized model of the detachable and strengthened compression member reach target performance parameters; the performance parameters include: at least one of an eigenvalue buckling load and a nonlinear buckling load;

[0108] Step S120, based on the optimized model of the detachable reinforced compression rod, determine the length of the first hoop, the length of the second hoop, the thickness of the first hoop, the thickness of the second hoop, the inner diameter of the first hoop, the inner diameter of the second hoop, the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring;

[0109] Step S130, preparing a first hoop according to the length of the first hoop, the thickness of the first hoop and the inner diameter of the first hoop;

[0110] Step S140, preparing a second hoop according to the length of the second hoop, the thickness of the second hoop and the inner diameter of the second hoop;

[0111] Step S150, preparing a sleeve according to the length of the half sheet, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the overhanging portion, the thickness of the first convex ring and the thickness of the second convex ring.

[0112] Specifically, when constructing the model of the detachable and strengthened compressive member, the first hoop, the second hoop and the sleeve are configured according to the length, thickness and outer diameter of the member to be strengthened, and the mechanical performance analysis and the performance parameters of the model of the detachable and strengthened compressive member are verified by numerical analysis software such as finite element program. If the performance parameters of the model of the detachable and strengthened compressive member do not reach the target performance parameters, it is necessary to adjust the size of the first hoop, the size of the second hoop and the size of the sleeve until the performance parameters of the model of the detachable and strengthened compressive member reach the target performance parameters. Adjusting the size of the first hoop, the size of the second hoop and the size of the sleeve may be to increase the length of the half sheet, the thickness of the first hoop, the thickness of the second hoop and the thickness of the arc portion.

[0113] In order to simplify the model construction and optimization process, the size of some structures in the model has little effect on the performance parameters. After determining the thickness of the rod to be strengthened and the outer diameter of the rod to be strengthened, the size of these structures in the model can be fixed, and only the size of the remaining structures in the model can be adjusted to optimize the performance parameters. For example, the inner diameter of the first hoop and the inner diameter of the second hoop are equal to the outer diameter of the rod to be strengthened, so that the first hoop and the second hoop can just fit outside the rod to be strengthened. The thickness of the first hoop is the same as the thickness of the second hoop, and both are equal to the difference between the inner diameter of the sleeve and the outer diameter of the rod to be strengthened. The thickness of the first convex ring is the same as the thickness of the second convex ring, and the thickness of the first convex ring is the same as the thickness of the first hoop, and the thickness of the second convex ring is the same as the thickness of the second hoop. The inner diameter of the arc portion is equal to the outer diameter of the first hoop (or the second hoop). The thickness of the arc portion is the same as the thickness of the first hoop (or the second hoop), and the thickness of the overhanging portion is the same as the thickness of the first hoop (or the second hoop).

[0114] The length of the half sheet is the sum of the length of the first hoop, the length of the second hoop, the length of the first convex ring, the length of the second convex ring, and the gap (i.e., the distance between the end of the first tube section and the end of the second tube section, i.e., the length of the section to be removed by the strengthening rod). The gap is usually 30-40 mm, the length of the first convex ring is usually 1 / 6-1 / 5 of the length of the half sheet, and the length of the second convex ring is usually 1 / 6-1 / 5 of the length of the half sheet. In a pair of first hoops, the two first hoops can be equal or in a ratio.

[0115] The thickness of the first hoop, the inner diameter of the first hoop, the thickness of the second hoop, the inner diameter of the second hoop, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhang portion, the thickness of the first convex ring, the thickness of the second convex ring, and the gap and other structural dimensions can be fixed, and the length of the half sheet, the length of the first hoop, the length of the second hoop, the length of the first convex ring, and the length of the second convex ring and other structural dimensions can be adjusted. Therefore, the length of the half sheet is used as the main structural dimension to be adjusted (when the length of the half sheet is adjusted, the other lengths also change accordingly) to optimize the performance parameters, and the ratio of the length of the half sheet to the tube length (i.e., the length of the rod to be strengthened) is 1 to 2:10.

[0116] The performance parameter may adopt characteristic value buckling load and / or nonlinear buckling load, and the nonlinear buckling load is a nonlinear buckling load that takes initial defects into consideration. The target performance parameter may be determined according to the requirements of the actual application scenario, or may be determined based on the performance parameters of the member to be strengthened, for example, the target performance parameter is 1.4 times the performance parameter of the member to be strengthened, with a goal of increasing by 40%.

[0117] Taking the initial diagonal web member in a real engineering grid model as an example for strengthening design, the unstrengthened member is 3200mm long and has a cross-sectional size of Φ114×4.0mm. The strengthening structural details of this member are designed as follows Fig. 9 As shown in the figure, the cross section of the semicircular thickened sleeve is Φ140×4.0mm, and the total length of the entire rod is 3200mm. Based on ABAQUS, the eigenvalue buckling analysis and nonlinear buckling analysis considering initial defects were performed on the rods before and after strengthening to evaluate the enhancement effect of the compressive buckling bearing capacity of the rods before and after strengthening. The meshing and contact definition of the finite element model of the strengthened rod are shown in Fig.10 To clearly show the mesh and contact settings of each component, Fig.10 Some symmetrical parts are hidden in the figure. The unreinforced rod is also modeled with solid elements, divided into 64 equal parts along the circumference, and the length of the axial unit is 50 mm. Considering that the rod is connected by welded balls, the boundary conditions are set to be rigid at both ends, and only one end releases the degree of freedom of axial displacement. A unit force of axial compression is applied to this end to perform eigenvalue buckling analysis, and the modal solutions of mid-span buckling of the two models are extracted for comparison. Fig.11 The eigenvalue buckling load of the unstrengthened member in this mode is about 1251 kN, while the eigenvalue buckling load of the strengthened member is about 2115 kN, an increase of about 69%.

[0118] Further, an initial defect of 1 / 300 of the rod length under the current mode is introduced into the two models and a nonlinear buckling analysis is performed. The load-displacement curves of the unstrengthened rod and the strengthened rod are output as follows: Fig.12As shown in the figure, the critical load of the unreinforced rod is 278.8kN, while the critical load of the reinforced rod reaches 392.2kN, an increase of about 40.7%. And from the plastic development morphology of the two, it can be seen that the failure modes of the two are different. The unreinforced rod follows the way of long and thin rods buckling under compression, and the plasticity is concentrated in the mid-span development; the reinforced rod is divided into two short and thick rods that are deformed by compression and bending due to the increase in the middle stiffness, and the plastic development is relatively difficult, thereby improving the compressive strength.

[0119] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A detachable reinforced compression rod at the support end of a grid structure, characterized in that: include: A first section of pipe, wherein at least one pair of first hoops are disposed at the end of the first section of pipe; a second pipe section, wherein at least one pair of second ferrules are provided at the end of the second pipe section; a sleeve formed with at least one first protruding ring and at least one second protruding ring; Wherein, the sleeve is sleeved on the end of the first section of the pipe and the end of the second section of the pipe; The first convex ring is located between two adjacent first hoops; The second protruding ring is located between two adjacent second hoops.

2. The detachable reinforced compression rod at the support end of the grid structure according to claim 1 is characterized in that: There is a gap between the end of the first tube section and the end of the second tube section.

3. The detachable reinforced compression rod at the support end of the grid structure according to claim 1 is characterized in that: The sleeve comprises: two half pieces, and the two half pieces are connected by a connecting piece.

4. The detachable reinforced compression rod at the support end of the grid structure according to claim 3 is characterized in that: The half piece comprises: An arc-shaped portion, wherein the inner side of the arc-shaped portion forms at least one first half ring and at least one second half ring; Two outward extensions are formed at two ends of the arc-shaped portion respectively; Wherein, a via hole is formed on the protruding portion, and the connecting member is passed through and connected to the via hole; The first half rings of the two half sheets are put together to form the first convex ring; The second half rings of the two half sheets are put together to form the second convex ring.

5. The detachable reinforced compression rod at the support end of the grid structure according to claim 4, characterized in that: The connecting piece is a bolt; the thickness of the arc portion and the thickness of the extending portion are both the same as the thickness of the first section of the tube; the sum of the length of the first section of the tube and the length of the second section of the tube is the tube length, and the ratio of the length of the half piece to the tube length is 1 to 2:

10.

6. The detachable reinforced compression rod at the support end of the grid structure according to any one of claims 1 to 5, characterized in that: The first section of the pipe and the second section of the pipe are both made of steel pipes; the sleeve is made of a steel cylinder; the first hoop and the second hoop are both made of steel hoops.

7. The detachable reinforced compression rod at the support end of the grid structure according to claim 6, characterized in that: The first hoop is welded to the first section of the pipe on a side facing away from the first convex ring, the first hoop forms a first guide surface on a side facing the first convex ring, and the first convex ring forms a first chamfer on a side facing the first hoop; The side of the second hoop facing away from the second convex ring is welded to the second pipe section, the side of the second hoop facing the second convex ring forms a second guide surface, and the side of the second convex ring facing the second hoop forms a second chamfer.

8. The detachable reinforced compression rod at the support end of the grid structure according to claim 6, characterized in that: The outer diameter of the first section of the pipe and the outer diameter of the second section of the pipe are both 100 mm to 130 mm; The length of the first hoop and the length of the second hoop are both 40 mm to 100 mm; The length of the first convex ring and the length of the second convex ring are both 80 mm to 120 mm; The thickness of the first hoop, the thickness of the second hoop, the thickness of the first convex ring, and the thickness of the second convex ring are all 6 mm to 10 mm.

9. A method for preparing a detachable reinforced compression rod at the support end of a grid structure according to any one of claims 1 to 8, characterized in that: Includes steps: Determine the size of the first hoop, the size of the second hoop and the size of the sleeve according to the size of the rod to be strengthened, and prepare the first hoop, the second hoop and the sleeve; Removing a section of the rod to be strengthened to form a first section of the tube and a second section of the tube; Connecting the first ferrule to the end of the first pipe section, and connecting the second ferrule to the end of the second ferrule; The sleeve is sleeved on the end of the first section of the pipe and the end of the second section of the pipe, wherein the first convex ring is located between two adjacent first hoops, and the second convex ring is located between two adjacent second hoops.

10. The method for preparing the detachable reinforced compression rod at the support end of the grid structure according to claim 9, characterized in that: The dimensions of the rod to be strengthened include: the length of the rod to be strengthened, the thickness of the rod to be strengthened and the outer diameter of the rod to be strengthened; the dimensions of the first hoop include: the length of the first hoop, the thickness of the first hoop and the inner diameter of the first hoop; the dimensions of the second hoop include: the length of the second hoop, the thickness of the second hoop and the inner diameter of the second hoop; the dimensions of the sleeve include: the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring and the thickness of the second convex ring; The method of determining the size of the first hoop, the size of the second hoop and the size of the sleeve according to the size of the rod to be strengthened, and preparing the first hoop, the second hoop and the sleeve comprises: Based on the length of the to-be-strengthened member, the thickness of the to-be-strengthened member, and the outer diameter of the to-be-strengthened member, a model of the detachable and strengthened compression member is constructed and optimized so that the performance parameters of the optimized model of the detachable and strengthened compression member reach target performance parameters; the performance parameters include: at least one of an eigenvalue buckling load and a nonlinear buckling load; Based on the optimized model of the detachable reinforced compression rod, determine the length of the first hoop, the length of the second hoop, the thickness of the first hoop, the thickness of the second hoop, the inner diameter of the first hoop, the inner diameter of the second hoop, the length of the half sheet, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring; preparing a first hoop according to the length of the first hoop, the thickness of the first hoop and the inner diameter of the first hoop; preparing a second hoop according to the length of the second hoop, the thickness of the second hoop and the inner diameter of the second hoop; A sleeve is prepared according to the length of the half piece, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the overhanging portion, the thickness of the first convex ring, and the thickness of the second convex ring.

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