Beam-column joint reinforced by FRP (Fiber Reinforce Plastic) pipe

Abstract

The invention discloses a beam-column joint reinforced through FRP pipes, and belongs to the technical field of construction building structures, the beam-column joint comprises a joint formwork for bearing concrete, a plurality of steel bars are arranged in the joint formwork and are distributed in a horizontally and vertically staggered mode, the FRP pipes are vertically arranged at the joint positions in the joint formwork, a plurality of through holes are formed in the side faces of the FRP pipes in a penetrating mode, and the FRP pipes are connected with the joint formwork. The reinforcing steel bars penetrate through the penetrating holes, the FRP pipe is arranged in the middle of the beam-column joint, the FRP pipe provides 45-degree shear resistance and annular constraint for the beam-column joint through the tubular structure, the bending resistance of the beam-column joint in the vibration environment is improved, the FRP pipe is arranged to replace the vertical limit reinforcing steel bars, the number of the reinforcing steel bars is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction building structures, and in particular relates to a beam-column node reinforced by an FRP tube. Background Art

[0002] The beam-column joint is the force transmission hub of the entire system and an important component to ensure the integrity of the structure. The beam-column joint refers to the place where the beam and column intersect in the frame structure. Its function is to connect and transfer loads to form a whole beam-column structure. The design and construction of the beam-column joint is crucial to the stability and safety of the entire structure.

[0003] Due to the insufficient shear bearing capacity of the beam-column joint, the shear force at the joint will be concentrated under the action of an earthquake, increasing the risk of node damage. Shear failure is brittle and usually occurs along a 45° angle. It occurs quickly and is difficult to warn. Due to the combined action of bending moment and shear force, the beam-column joint is prone to bending-shear effect, which will cause the node to be subjected to shear force concentration, increasing the risk of node damage. Therefore, the existing technology generally further increases the steel bars in the beam-column joint, which will result in dense steel bars at the joint, low construction efficiency, and occupy too much concrete space, resulting in less concrete structure. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a beam-column joint reinforced by an FRP tube. By adding the FRP tube, the beam-column joint is provided with 45° shear resistance and annular constraint, thereby improving the shear resistance and reducing the use of steel bars.

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

[0006] The present invention comprises a node formwork for holding concrete, wherein a plurality of steel bars are arranged in the node formwork, and the plurality of steel bars are staggered horizontally and vertically. An FRP tube is vertically placed at the node position in the node formwork, and a plurality of through holes are provided through the side of the FRP tube, and steel bars are arranged through the through holes.

[0007] Furthermore, it also includes two cross rails, which are parallel to each other, and the two ends of the two cross rails are slidably arranged on the upper edge of the FRP tube respectively, and also includes a top plate, which is slidably arranged on the two cross rails at the same time, and a circular hole is vertically opened on the top plate, a vertical shaft is slidably arranged in the circular hole, a cross beam is horizontally slidably arranged at the bottom end of the vertical shaft, and a guide groove is opened on the cross beam.

[0008] Furthermore, a rack is provided on the upper side of the cross beam, a gear meshing with the rack is rotatably provided inside the bottom end of the vertical shaft, a first rotating wheel is coaxially provided on the gear, a second rotating wheel is rotatably provided inside the upper end of the vertical shaft, the second rotating wheel extends out of the vertical shaft along the rotating shaft and is fixedly connected to a rotating handle, and the second rotating wheel and the first rotating wheel are both surrounded by an elastic rope loop.

[0009] Furthermore, a pressure plate is provided in the top plate for vertical movement, a spring is provided between the pressure plate and the top plate, the pressure plate is located above the inner cross rail of the top plate, a threaded hole coaxial with the circular hole is provided at the top of the top plate, a rotating cylinder is threadedly connected to the threaded hole, a conical hole coaxial with the circular hole is provided in the rotating cylinder, a plurality of arc-shaped pieces are provided around the circular hole on the inner side of the top plate, the outer side of the arc-shaped piece is a conical surface, the rotating cylinder is located above the pressure plate, and the arc-shaped piece is located on the inner side of the conical hole, the rotating cylinder is rotated to move downward, the rotating cylinder presses down the pressure plate and retracts the arc-shaped piece inward, and at the same time locks the movement of the top plate and the vertical axis.

[0010] Furthermore, the cross section of the cross beam is J-shaped, the upper edge of the cross beam is slidably arranged in the vertical axis, and the guide slot opens upward on the cross beam.

[0011] Furthermore, the two cross rails are symmetrically arranged relative to the diameter of the FRP tube.

[0012] The beneficial effects of the present invention are:

[0013] The present invention arranges an FRP tube in the middle position of the beam-column node. The FRP tube provides 45° shear resistance and annular constraint to the beam-column node through a tubular structure, thereby improving the bending resistance of the beam-column node under a vibration environment. By arranging the FRP tube instead of the vertical quota steel bars, the number of steel bars is reduced, thereby improving construction efficiency.

[0014] 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

[0015] 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:

[0016] Figure 1 This is a schematic diagram of the overall structure of a beam-column node according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of an FRP pipe penetrating a steel pipe according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the FRP tube according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 A sectional view of the

[0020] Figure 5 for Figure 3 A cross-sectional view at point B;

[0021] The markings in the attached drawings are as follows: 1. node formwork; 2. FRP pipe; 21. perforation; 3. cross rail; 4. top plate; 41. round hole; 42. pressure plate; 43. spring; 44. threaded hole; 45. arc-shaped sheet; 5. vertical axis; 51. gear; 52. first rotating wheel; 53. second rotating wheel; 531. turning handle; 54. elastic rope loop; 6. cross beam; 61. guide slide groove; 62. rack; 7. rotating drum; 71. tapered hole. DETAILED DESCRIPTION

[0022] like Figure 1 The present invention discloses a beam-column joint reinforced by an FRP tube, including a node formwork 1 for holding concrete, the node formwork 1 is made by the appearance structure of the beam-column joint, a plurality of steel bars are arranged in the node formwork 1, and the plurality of steel bars are staggered horizontally and vertically as the skeleton of the beam-column joint, an FRP tube 2 is vertically placed at the node position in the node formwork 1, a plurality of through holes 21 are penetrated through the side of the FRP tube 2, and steel bars are arranged through the plurality of through holes 21.

[0023] In this solution, FRP tube 2 is set in the middle position of the beam-column node. FRP tube 2 provides 45° shear resistance and annular constraint to the beam-column node through the tubular structure, thereby improving the bending resistance of the beam-column node under a vibration environment. By setting FRP tube 2 instead of vertical quota steel bars, the setting of steel bars is reduced, thereby improving construction efficiency.

[0024] In a further solution, Figure 2 and Figure 3 As shown, it also includes two cross rails 3, the two cross rails 3 are parallel to each other, and the two cross rails 3 are symmetrically arranged relative to the diameter of the FRP tube 2; the two ends of the two cross rails 3 are respectively slidably arranged on the upper edge of the FRP tube 2, and also includes a top plate 4, the top plate 4 is slidably arranged on the two cross rails 3 at the same time, the top plate 4 is coaxially vertically provided with a circular hole 41, a vertical shaft 5 is slidably arranged in the circular hole 41, a cross beam 6 is slidably arranged at the bottom end of the vertical shaft 5, a guide groove 61 is arranged on the cross beam 6, the cross beam 6 has a J-shaped cross section, the upper edge of the cross beam 6 is slidably arranged in the vertical shaft 5, and the guide groove 61 opens upward on the cross beam 6.

[0025] In this scheme, two parallel horizontal rails 3 are set, and the two ends of the horizontal rails 3 are slidably set on the upper edge of the FRP tube 2. By slidingly setting a top plate 4 on the two horizontal rails 3 at the same time, the top plate 4 can move along the horizontal rails 3, and the two horizontal rails 3 can rotate around the axis of the FRP tube 2, so that the top plate 4 can move to any position within a certain range above the FRP tube 2. By rotating and sliding a vertical shaft 5 set on the top plate 4, the vertical shaft 5 can move with the top plate 4, and the cross beam 6 at the end of the vertical shaft 5 can rotate and move up and down with the vertical shaft 5, and can be horizontally moved at the end of the vertical shaft 5. Movement, through this structure, the horizontal axis can move and pass the end into any perforation 21 located on the side of the FRP tube 2. At this time, the steel bar can be moved along the guide slot 61. The guide slot 61 serves as a guide structure for the perforation 21 to support and guide the steel bar so that the steel bar can smoothly pass through the perforation 21 opposite the FRP tube 2 along the guide slot 61. After completing the perforation 21, the moving crossbeam 6 can move the crossbeam 6 out and guide the next perforation 21. When the number of perforations 21 is large, this structure assists the insertion and exit of the steel bar and improves the efficiency of steel bar placement.

[0026] In a further solution, Figure 3 and Figure 4 As shown, a rack 62 is provided on the upper side of the crossbeam 6, a gear 51 meshing with the rack 62 is rotatably provided inside the bottom end of the vertical shaft 5, a first rotating wheel 52 is coaxially provided on the gear 51, a second rotating wheel 53 is rotatably provided inside the upper end of the vertical shaft 5, the second rotating wheel 53 extends out of the vertical shaft 5 along the rotating axis and is fixedly connected to a rotating handle 531, and an elastic rope ring 54 is simultaneously surrounded by the second rotating wheel 53 and the first rotating wheel 52.

[0027] In this structure, by rotating the handle 531 at the top of the vertical axis 5, the second rotating wheel 53 rotates, and the first rotating wheel 52 rotates along with the elastic rope ring 54. The first rotating wheel 52 drives the gear 51 to rotate, and the gear 51 drives the rack 62 and the crossbeam 6 to move. In this structure, the elastic rope ring 54 is provided to ensure that the first rotating wheel 52 and the second rotating wheel 53 are tightened. By controlling the rotating handle 531 at the top of the vertical axis 5, the movement of the crossbeam 6 can be smoothly controlled. The operation is flexible and unobstructed, which is convenient for observation and control.

[0028] In a further solution, Figure 5As shown, a pressure plate 42 is provided in the top plate 4 for vertical movement, a spring 43 is provided between the pressure plate 42 and the top plate 4, the pressure plate 42 is located above the cross rail 3 in the top plate 4, a threaded hole 44 coaxial with the circular hole 41 is provided on the top of the top plate 4, a rotating drum 7 is threadedly connected to the threaded hole 44, the rotating drum 7 is provided with a conical hole 71 coaxial with the circular hole 41, a plurality of arcuate pieces 45 are provided around the circular hole 41 on the inner side of the top plate 4, the outer side of the arcuate piece 45 is a conical surface, the rotating drum 7 is located above the pressure plate 42, the arcuate piece 45 is located on the inner side of the conical hole 71, the rotating drum 7 is rotated to move the rotating drum 7 downward, the rotating drum 7 presses down the pressure plate 42 and retracts the arcuate piece 45 inward, and at the same time locks the movement of the top plate 4 and the vertical axis 5.

[0029] In this structure, after the position of the cross beam 6 is determined, the top plate 4 and the vertical axis 5 can be quickly locked by rotating the rotating drum 7, limiting the vertical movement and rotation of the vertical axis 5, while limiting the movement of the top plate 4 on the cross rail 3. After the through hole 21 is inserted into the end of the cross beam 6, the fixation of the vertical axis 5 and the top plate 4 can significantly reduce the shaking of the entire frame and enhance the guiding function of the cross beam 6.

[0030] 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 beam-column joint reinforced by FRP tubes, characterized in that: The invention comprises a node formwork (1) for holding concrete, wherein a plurality of steel bars are arranged in the node formwork (1), and the plurality of steel bars are staggered horizontally and vertically. An FRP tube (2) is vertically placed at the node position in the node formwork (1), and a plurality of through holes (21) are provided through the side of the FRP tube (2), and steel bars are provided through the plurality of through holes (21).

2. The beam-column joint reinforced by FRP tube according to claim 1, characterized in that: The invention also comprises two cross rails (3), the two cross rails (3) are parallel to each other, the two ends of the two cross rails (3) are respectively slidably arranged on the upper edge of the FRP tube (2), and a top plate (4), the top plate (4) is slidably arranged on the two cross rails (3) at the same time, a circular hole (41) is vertically provided on the top plate (4), a vertical shaft (5) is slidably arranged in the circular hole (41), a cross beam (6) is slidably arranged at the bottom end of the vertical shaft (5), and a guide groove (61) is provided on the cross beam (6).

3. The beam-column joint reinforced by FRP tube according to claim 2, characterized in that: A rack (62) is provided on the upper side of the cross beam (6); a gear (51) meshing with the rack (62) is rotatably provided inside the bottom end of the vertical shaft (5); a first rotating wheel (52) is coaxially provided on the gear (51); a second rotating wheel (53) is rotatably provided inside the upper end of the vertical shaft (5); the second rotating wheel (53) extends out of the vertical shaft (5) along the rotating axis and is fixedly connected to a rotating handle (531); and an elastic rope ring (54) is simultaneously surrounded by the second rotating wheel (53) and the first rotating wheel (52).

4. The beam-column joint reinforced by FRP tubes according to claim 3, characterized in that: A pressure plate (42) is provided in the top plate (4) for vertical movement. A spring (43) is provided between the pressure plate (42) and the top plate (4). The pressure plate (42) is located above the cross rail (3) in the top plate (4). A threaded hole (44) coaxial with the circular hole (41) is provided at the top of the top plate (4). A rotating drum (7) is threadedly connected to the threaded hole (44). The rotating drum (7) is provided with a conical hole (71) coaxial with the circular hole (41). (4) A plurality of arc-shaped sheets (45) are arranged around the circular hole (41) on the inner side, and the outer side of the arc-shaped sheets (45) is a conical surface. The rotating cylinder (7) is located above the pressure plate (42), and the arc-shaped sheets (45) are located inside the conical hole (71). The rotating cylinder (7) is rotated to move the rotating cylinder (7) downward, and the rotating cylinder (7) presses down the pressure plate (42) and retracts the arc-shaped sheets (45) inward, while locking the movement of the top plate (4) and the vertical shaft (5).

5. The beam-column joint reinforced by FRP tubes according to claim 4, characterized in that: The cross-section of the cross-beam (6) is J-shaped, the upper edge of the cross-beam (6) is slidably arranged in the vertical shaft (5), and the guide sliding groove (61) is opened upward on the cross-beam (6).

6. The beam-column joint reinforced by FRP tubes according to claim 5, characterized in that: The two cross rails (3) are symmetrically arranged relative to the diameter of the FRP pipe (2).

Images