Novel FRP pipe-concrete combined structure

Abstract

The invention discloses a novel FRP pipe-concrete composite structure, and belongs to the technical field of beam-column joint structures, by arranging steel bars in a beam-column formwork and arranging FRP pipes on beam-column joints, 45-degree oblique shear force can be effectively resisted, and by means of the high tensile strength of the FRP pipes, when the 45-degree shear force is applied, the shear force of the beam-column joints can be effectively resisted. The FRP pipe can share shear stress originally borne by concrete and steel bars through the mechanical property of the material of the FRP pipe, the problems of cracks, breakage, bending and the like at the joint due to oblique shear force are solved, and the safety of the structure is guaranteed when the structure bears lateral force, such as horizontal force generated by earthquake action and the like; according to the structure, the four FRP pipes are distributed at four corners, no matter which oblique angle the shearing force is applied to the beam column joint, the FRP pipes can synergistically play a shearing resisting role, a mutually-supporting and mutually-matched shearing resisting system is formed, and the bearing capacity of the joint under the working condition of oblique shearing at different angles is integrally improved.

Description

Technical Field

[0001] The invention belongs to the technical field of beam-column node structures, and in particular relates to a novel FRP tube-concrete combined structure. Background Art

[0002] In the field of modern construction engineering, with the continuous increase in building height, the increasing complexity of structural forms and the continuous improvement of building performance requirements, traditional concrete structures have gradually exposed their limitations in some aspects. As a widely used building material, concrete has high compressive strength but relatively low tensile strength. It is easy to crack when subjected to large tensile forces or complex stress states, which in turn affects the durability and integrity of the structure.

[0003] In key parts such as beam-column joints, due to the complex forces and obvious stress concentration, traditional concrete structures often require a large number of steel bars for reinforcement, which not only increases the difficulty and cost of construction, but also may cause problems such as loose concrete pouring at the joints due to improper steel bar arrangement, affecting the mechanical properties of the joints. In beam-column joints, 45° shear stress is often more concentrated and has a larger value. Due to the insufficient tensile strength of concrete, it is very easy to cause the generation and expansion of oblique cracks in the node area. These cracks will destroy the integrity of the concrete, weaken the bearing capacity of the node, and thus affect the mechanical properties and stability of the entire structure. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a novel FRP tube-concrete composite structure, by adding FRP tubes at the beam-column joints to improve the shear resistance of the beam-column joints.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention comprises a beam-column formwork for casting a beam-column joint, wherein a plurality of horizontally and vertically distributed steel bars are arranged in the beam-column formwork, and four FRP tubes are arranged in the middle of the beam-column joint, the four FRP tubes are distributed at four corners, a plurality of through holes are opened on the FRP tubes, and the horizontally distributed steel bars pass through the through holes.

[0007] Furthermore, it also includes a suspension frame, which includes a sleeve coaxially fixed on the top end of one of the vertically distributed steel bars, the sleeve is coaxially fixed with a vertical axis, two rotating beams are rotatably provided on the vertical axis, and a groove is provided in the extension direction of the rotating beam, and it also includes a cylindrical vertical rod, and the vertical rod vertically passes through the groove, and also includes a pull rope and a stop beam, the pull rope enters from the upper end of the vertical rod and exits from the lower end, the middle end of the stop beam is fixed to the lower end of the pull rope, and three cross rods are distributed around the lower end of the vertical rod, the cross rod is threadedly connected with a stop nut, the three cross rods are stopped on the upper edge of the FRP tube, the stop nut is stopped on the side of the FRP tube, the pull rope is tightened so that the two ends of the stop beam are stopped on the lower edge of the FRP tube, and a stop plate is threaded on the vertical rod, and the stop plate is stopped on the upper side of the rotating beam.

[0008] Furthermore, a threaded column is provided at the top of the vertical axis, and the threaded column is threadedly connected to an internal threaded tube. A blocking rod is fixed on the inner side of the top of the internal threaded tube. After the pull rope tightens the blocking beam, it is knotted and fixed to the blocking rod, and the blocking beam is further tightened by rotating the internal threaded tube.

[0009] Furthermore, the sleeve is inserted from the upper end of the steel bar, and three locking screws are threadedly connected around the bottom end of the sleeve, and the locking screws are against the outside of the fixed steel bar.

[0010] Furthermore, a clamping block is slidably provided on the crossbar, and a clamping surface with an obtuse angle is provided on the side of the clamping block facing the FRP tube. The retaining nut abuts against the clamping block, so that the clamping block is clamped on the outside of the FRP tube.

[0011] The beneficial effects of the present invention are:

[0012] The present invention arranges steel bars in the beam-column formwork and arranges FRP tubes at the beam-column nodes. The arrangement of the FRP tubes can effectively resist a 45° oblique shear force. Through the relatively high tensile strength of the FRP tubes themselves, when facing a 45° shear force, the FRP tubes can share the shear stress originally borne by the concrete and steel bars through the mechanical properties of their own materials, thereby preventing problems such as cracks, breakage, and bending at the nodes due to the oblique shear force, and ensuring the safety of the structure when it is subjected to lateral forces such as horizontal forces generated by earthquakes. This structure is distributed at four corners through four FRP tubes. No matter from which oblique angle the shear force is applied to the beam-column node, the FRP tubes can synergistically exert an anti-shear effect, forming a mutually supporting and cooperative anti-shear system, thereby overall improving the bearing capacity of the node under oblique shear conditions at different angles.

[0013] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0015] Figure 1 This is a schematic diagram of the FRP tube distribution of the combined structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the FRP pipe hoisting of the combined structure according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of point A;

[0018] Figure 4 for Figure 2 A cross-sectional view at point B;

[0019] Figure 5 This is a schematic diagram of the details of the FRP pipe hoisting according to an embodiment of the present invention;

[0020] Figure 6 for Figure 5 An enlarged schematic diagram of point C;

[0021] Figure 7 for Figure 5 An enlarged schematic diagram of point D;

[0022] The markings in the attached drawings are as follows: 1. Beam-column formwork; 2. FRP pipe; 21. Through hole; 3. Suspension bracket; 31. Sleeve; 311. Locking screw; 32. Vertical axis; 33. Rotating beam; 331. Slot; 34. Vertical rod; 341. Baffle plate; 35. Pull rope; 36. Baffle beam; 37. Cross rod; 371. Baffle nut; 372. Clamp; 38. Threaded column; 39. Threaded cylinder; 391. Baffle rod; 6. Rebar. DETAILED DESCRIPTION

[0023] The present invention discloses a novel FRP tube-concrete composite structure, such as Figure 1 As shown, it includes a beam-column formwork 1 for casting a beam-column joint, wherein the beam-column formwork 1 is provided with a plurality of steel bars 6 distributed horizontally and vertically, and four FRP tubes 2 are provided in the middle of the beam-column joint, wherein the four FRP tubes 2 are distributed at four corners, and a plurality of through holes 21 are provided on the FRP tubes 2, and the transversely distributed steel bars 6 pass through the through holes 21.

[0024] This structure, by arranging steel bars 6 in the beam-column formwork 1 and arranging FRP tubes 2 at the beam-column nodes, the arrangement of the FRP tubes 2 can effectively resist a 45° oblique shear force. Through the relatively high tensile strength of the FRP tubes 2 themselves, when facing a 45° shear force, the FRP tubes 2 can share the shear stress originally borne by the concrete and steel bars 6 through the mechanical properties of their own materials, thereby preventing cracks, breakage, bending and other problems at the nodes due to the oblique shear force, and ensuring the safety of the structure when it is subjected to lateral forces, such as horizontal forces generated by earthquakes. This structure is distributed at four corners through four FRP tubes 2. No matter from which oblique angle the shear force is applied to the beam-column node, the FRP tubes 2 can synergistically exert a shear-resistant effect, forming a mutually supporting and cooperative shear-resistant system, thereby overall improving the bearing capacity of the node under oblique shear conditions at different angles.

[0025] In a further solution, Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, the hanger 3 also includes a sleeve 31 coaxially fixed to the top of one of the vertically distributed steel bars 6, the sleeve 31 is coaxially fixed with a vertical shaft 32, two rotating beams 33 are rotatably provided on the vertical shaft 32, and a groove 331 is provided in the extending direction of the rotating beam 33, and a cylindrical vertical rod 34 is also included, and the vertical rod 34 vertically passes through the groove 331, and also includes a pull rope 35 and a stop beam 36, the pull rope 35 passes through the upper end of the vertical rod 34 and passes out from the lower end, and the stop beam 36 passes through the vertical rod 34. The middle end of 6 is fixed to the lower end of the pull rope 35, and three cross bars 37 are distributed around the lower end of the vertical rod 34. The cross bars 37 are threadedly connected with stop nuts 371. The three cross bars 37 are blocked on the upper edge of the FRP tube 2, and the stop nuts 371 are blocked on the side of the FRP tube 2. The pull rope 35 is tightened so that the two ends of the stop beam 36 are blocked on the lower edge of the FRP tube 2. The vertical rod 34 is threaded with a stop plate 341, and the stop plate 341 is blocked on the upper side of the rotating beam 33.

[0026] In this scheme, the suspension frame 3 is mainly composed of a sleeve 31, a vertical shaft 32, a rotating beam 33, a vertical rod 34, a pull rope 35, a stop beam 36, a cross bar 37, a stop nut 371 and a stop plate 341. Among them, the sleeve 31 is coaxially fixed to the top of a vertically distributed steel bar 6, so as to build a stable support foundation for the entire suspension frame 3, making full use of the structural stability and bearing capacity of the existing vertical steel bars 6. Two rotating beams 33 are rotatably arranged on the vertical shaft 32, and a groove 331 is opened in the extension direction of the rotating beam 33. This groove 331 structure provides an effective guide path for the movement of the vertical rod 34, so that the vertical rod 34 can flexibly adjust its position within a specific trajectory range. The vertical rod 34 adopts a cylindrical design, and its groove 331 vertically penetrates the rotating beam 33, thereby forming a linkage relationship with the rotating beam 33. The pull rope 35 is inserted from the upper end of the vertical rod 34 and passes out from the lower end. At the lower end of the vertical rod 34, the middle end of the stop beam 36 is fixed on the pull rope 35. Three cross bars 37 are evenly distributed around the lower end of the vertical rod 34, and the cross bars 37 are equipped with stop nuts 371 by threaded connection. In actual operation, the three cross bars 37 can be stopped at the upper edge of the FRP tube 2, and then the stop nuts 371 are rotated to clamp and position the upper end of the FRP tube 2, ensuring that the relative position of the FRP tube 2 on the vertical rod 34 is accurate and will not easily deviate. At the same time, by tightening the pull rope 35 upward, the two ends of the stop beam 36 can be stopped at the lower edge of the FRP tube 2. With the help of the traction force of the pull rope 35 and the blocking effect of the stop beam 36, the lower end of the FRP tube 2 can be effectively fixed, so that the FRP tube 2 is temporarily and firmly fixed at the end of the vertical rod 34. The threaded baffle 341 on the vertical rod 34 can be placed on the upper side of the rotating beam 33, which effectively supports and restricts the vertical movement of the vertical rod 34. This structural installation method is simple and does not require additional complex installation procedures and auxiliary support structures, reducing the construction difficulty and time cost. By setting two freely rotating rotating beams 33, the FRP tube 2 can be easily and flexibly moved to the specified precise position in the horizontal and vertical directions, effectively improving the operational convenience and positioning accuracy during the construction process. After completing the perforation operation of two FRP tubes 2, the installed FRP tube 2 can be removed, and then the other two FRP tubes 2 can be quickly suspended and perforated at the same time. The whole process is smooth and efficient, which significantly improves the construction efficiency and project progress.

[0027] The structure of the suspension frame 3 has many significant advantages. Its installation method is extremely simple. It only needs to coaxially insert the sleeve 31 onto the steel bar 6 that has been vertically installed, so that the suspension frame 3 can be easily and quickly built without the need for additional complicated installation procedures and auxiliary support structures, which greatly reduces the construction difficulty and time cost. It is particularly worth mentioning that by setting two freely rotating rotating beams 33, the suspension frame 3 can simultaneously efficiently suspend and accurately position two FRP tubes 2 that need to be perforated. The two rotating beams 33 give the FRP tube 2 a higher degree of freedom in space, so that the FRP tube 2 can be easily and flexibly moved to the specified precise position in the horizontal and vertical directions, effectively improving the operational convenience and positioning accuracy during the construction process. After completing the perforation operation of two FRP tubes 2, the installed FRP tube 2 can be easily removed, and then the other two FRP tubes 2 can be quickly suspended and perforated at the same time. The whole process is smooth and efficient, which significantly improves the construction efficiency and project progress, and provides strong technical support and construction guarantee for the application of new FRP tube-concrete composite structure in beam-column node construction.

[0028] In a further solution, Figure 4 As shown, a threaded column 38 is provided at the top of the vertical shaft 32, and the threaded column 38 is threadedly connected to an internal threaded tube 39, and a blocking rod 391 is fixedly provided on the inner side of the top of the internal threaded tube 39. After the pull rope 35 tightens the blocking beam 36, it is knotted and fixed at the blocking rod 391, and the blocking beam 36 is further tightened by rotating the internal threaded tube 39.

[0029] The tension adjustment mechanism added to this structure can further accurately control the blocking force of the stop beam 36 on the lower end of the FRP tube 2, ensuring that the FRP tube 2 always maintains a stable position during the suspension and subsequent perforation process, and the method of fixing the pull rope 35 by the internal threaded cylinder 39 and the stop rod 391 increases the redundancy of the entire suspension frame 3 system. Even if the pull rope 35 is loose to a certain extent, the tension of the pull rope 35 can be restored in time by rotating the internal threaded cylinder 39, ensuring the effective blocking of the FRP tube 2 by the stop beam 36, thereby preventing the FRP tube 2 from accidentally slipping or shifting.

[0030] In a further solution, Figure 6 As shown, the sleeve 31 is inserted from the upper end of the steel bar 6, and three locking screws 311 are threadedly connected around the bottom end of the sleeve 31, and the locking screws 311 are against the outer side of the fixed steel bar 6.

[0031] This structure can tightly fix the sleeve 31 on steel bars 6 of different specifications by adjusting the screw-in depth and tightness of the locking screw 311, avoiding the shaking of the vertical axis 32 caused by various vibrations, impacts and forces in different directions, and providing a stable and reliable support foundation for the suspension and construction operation of the FRP pipe 2.

[0032] In a further solution, Figure 3 As shown, a clamp block 372 is slidably provided on the cross bar 37 , and a clamp surface with an obtuse angle is provided on the side of the clamp block 372 facing the FRP tube 2 . The retaining nut 371 abuts against the clamp block 372 , so that the clamp block 372 is clamped on the outside of the FRP tube 2 .

[0033] The blunt-angle clamping surface design of the clamping block 372 can provide a more stable and uniform clamping force. When faced with different external dimension deviations or surface unevenness of the FRP tube 2, the blunt-angle clamping surface can better adapt to and fit the FRP tube 2, effectively disperse the clamping pressure, avoid damage to the FRP tube 2 due to local stress concentration, ensure the integrity and stability of the FRP tube 2 during the suspension process, prevent the FRP tube 2 from shaking, deflecting or falling off during the construction process, and ensure that subsequent construction operations can be carried out accurately and smoothly.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A novel FRP tube-concrete composite structure, characterized by: The invention comprises a beam-column formwork (1) for casting a beam-column joint, wherein a plurality of steel bars (6) distributed horizontally and vertically are arranged in the beam-column formwork (1), and four FRP tubes (2) are arranged in the middle of the beam-column joint, wherein the four FRP tubes (2) are distributed at four corners, and a plurality of through holes (21) are provided on the FRP tubes (2), and the steel bars (6) distributed horizontally pass through the through holes (21).

2. The novel FRP tube-concrete composite structure according to claim 1 is characterized in that: The invention also comprises a suspension frame (3), wherein the suspension frame (3) comprises a sleeve (31) coaxially fixed to the top end of one of the vertically distributed steel bars (6), wherein the sleeve (31) is coaxially fixed with a vertical shaft (32), wherein two rotating beams (33) are rotatably provided on the vertical shaft (32), wherein grooves (331) are provided in the extending direction of the rotating beams (33), and further comprises a cylindrical vertical rod (34), wherein the vertical rod (34) vertically passes through the grooves (331), and further comprises a pull rope (35) and a stop beam (36), wherein the pull rope (35) passes through the upper end of the vertical rod (34) and exits from the lower end, and wherein the stop beam (36) is provided on the vertical rod (34). 6) The middle end is fixed to the lower end of the pull rope (35), and three cross bars (37) are distributed around the lower end of the vertical rod (34). The cross bars (37) are threadedly connected with a stop nut (371). The three cross bars (37) are stopped at the upper edge of the FRP tube (2). The stop nut (371) is stopped on the side of the FRP tube (2). The pull rope (35) is tightened so that the two ends of the stop beam (36) are stopped at the lower edge of the FRP tube (2). The vertical rod (34) is threaded with a stop plate (341), and the stop plate (341) is stopped on the upper side of the rotating beam (33).

3. The novel FRP tube-concrete composite structure according to claim 2 is characterized in that: A threaded column (38) is provided at the top end of the vertical shaft (32), and the threaded column (38) is threadedly connected to an internal threaded tube (39), and a blocking rod (391) is fixedly provided on the inner side of the top end of the internal threaded tube (39). After the pull rope (35) tightens the blocking beam (36), it is knotted and fixed to the blocking rod (391), and the blocking beam (36) is further tightened by rotating the internal threaded tube (39).

4. The novel FRP tube-concrete composite structure according to claim 3 is characterized in that: The sleeve (31) is inserted from the upper end of the steel bar (6), and three locking screws (311) are threadedly connected around the bottom end of the sleeve (31), and the locking screws (311) are pressed against the outer side of the fixed steel bar (6).

5. The novel FRP tube-concrete composite structure according to claim 4 is characterized in that: A clamping block (372) is also slidably provided on the cross bar (37), and a clamping surface with an obtuse angle is provided on the side of the clamping block (372) facing the FRP tube (2). The retaining nut (371) abuts against the clamping block (372), so that the clamping block (372) is clamped on the outside of the FRP tube (2).

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