A connection joint of a newly-added concrete frame beam and an existing concrete frame column

Abstract

The utility model discloses a kind of connecting joint of new concrete frame beam and existing concrete frame column, including the shear recess that is chiseled in the outside of existing frame column along circumference, pouring ring beam setting outside shear recess, ring beam is respectively anchored and connected with existing frame column, frame beam by shear reinforcement, form connecting joint main structure at ring beam, ensure the continuous transmission of internal force by ring beam, shear reinforcement includes U-shaped reinforcement, beam longitudinal reinforcement, beam angle bar, different anchoring connection forms are constituted between frame beam, ring beam, existing frame column, jointly as shear reinforcement, can guarantee the shear safety of connecting joint, simultaneously, the main force steel of frame beam does not need to be all implanted existing frame column, optimize the position of the anchoring of traditional connection mode, facilitate construction.

Description

Technical Field

[0001] This utility model relates to the field of building renovation and reinforcement technology. More specifically, this utility model relates to a connection node between a newly added concrete frame beam and an existing concrete frame column. Background Technology

[0002] In the renovation and reinforcement of existing buildings, when new beams and slabs are required, the connection between the new main beams and the existing concrete frame columns is generally achieved by rebar installation. This connection method has the following problems:

[0003] (1) The location of the rebar installation may conflict with the main reinforcement of the existing concrete frame column;

[0004] (2) The beam reinforcement at the rebar joint is discontinuous, which is not conducive to the transmission of internal forces;

[0005] (3) The beam-column joints with the rebars overlap, and the contact surface between the new and old concrete is not conducive to shear resistance. Only the longitudinal reinforcement of the beam plays a role in shear resistance. Summary of the Invention

[0006] The purpose of this invention is to provide a connection node between a newly added concrete frame beam and an existing concrete frame column, so as to solve the technical problem in the prior art where only the longitudinal reinforcement of the beam plays a shear-resistant role in the connection node between the newly added beam and the existing frame column, resulting in poor shear resistance.

[0007] To achieve these objectives and other advantages according to this utility model, a connection node between a new concrete frame beam and an existing concrete frame column is provided, comprising:

[0008] Shear grooves are chiseled circumferentially on the outside of the existing frame columns at the height of the frame beams to be connected. The vertical length of the shear grooves is greater than the vertical thickness of the frame beams. The shear grooves are filled with poured concrete.

[0009] The ring beam is set around the outer periphery of the shear groove, and the concrete of the frame beam, the ring beam, and the inner side of the shear groove is cast in one piece.

[0010] Shear reinforcement includes U-shaped bars, longitudinal bars, and corner bars. The web of the U-shaped bars is anchored in the ring beam, and both ends are inserted into and anchored in the existing frame columns. The longitudinal bars are anchored in the frame beam and extend along the length of the corresponding frame beam. The end of the longitudinal bars facing the existing frame column passes through the ring beam and is inserted into the existing frame column, anchoring to both the ring beam and the existing frame column. The corner bars are anchored in the frame beam and extend along the length of the corresponding frame beam. The end of the corner bars facing the existing frame column passes through the ring beam and is inserted into the shear groove, anchoring to both the ring beam and the concrete in the shear groove.

[0011] Preferably, the top of the ring beam has a row of annular top longitudinal bars spaced radially, and the bottom of the ring beam has a row of annular bottom longitudinal bars spaced radially. Annular waist bars are arranged vertically between the top and bottom longitudinal bars. In the radial vertical plane of the ring beam, a closed hoop is welded to the outside of the top longitudinal bars, waist bars, and bottom longitudinal bars. The closed hoop is anchored in the ring beam and arranged at intervals around the circumference of the ring beam.

[0012] Preferably, the closed stirrups located in the extension direction of the frame beam are inserted downwards into the inner side of the web of the corresponding U-shaped steel bar on the side near the shear groove and welded.

[0013] Preferably, the longitudinal reinforcement and the corner reinforcement of the beam are arranged sequentially on the upper and lower sides of the ring beam. In the vertical direction, the longitudinal reinforcement is located outside the corner reinforcement, the U-shaped reinforcement is located between the corner reinforcement on the upper and lower sides, the longitudinal reinforcement is welded to the top longitudinal reinforcement or the bottom longitudinal reinforcement on the corresponding side, and the corner reinforcement is welded to the web reinforcement at the adjacent height.

[0014] Preferably, one end of the beam corner reinforcement is bent at a right angle toward the middle of the ring beam within the shear groove.

[0015] Preferably, the thickness of the ring beam is less than the vertical length of the shear groove and greater than the vertical thickness of the frame beam.

[0016] Preferably, the shear groove is drilled to a depth of 30 mm in the horizontal direction.

[0017] This utility model has at least the following beneficial effects: The connection node between the newly added concrete frame beam and the existing concrete frame column includes a shear-resistant groove chiseled circumferentially on the outside of the existing frame column and a ring beam cast outside the shear-resistant groove. The ring beam is anchored to the existing frame column and frame beam respectively through shear-resistant steel bars, forming the main structure of the connection node at the ring beam. The ring beam ensures the continuous transmission of internal forces. The shear-resistant steel bars include U-shaped steel bars, longitudinal beam bars, and corner beam bars. The corner beam bars are anchored to the frame beam, ring beam, and the integrally cast concrete in the shear-resistant groove respectively. The longitudinal reinforcement of the beam extends from the main body of the frame beam, passes through the ring beam and the shear groove in sequence to the existing frame column, and is anchored therein. The U-shaped steel bars are in the ring beam, pass through the shear groove, and enter the existing frame column for anchoring connection. That is, together with the U-shaped steel bars, longitudinal reinforcement of the beam, and corner reinforcement of the beam anchored in the concrete in the shear groove, they serve as shear reinforcement. They are set at different positions and have different anchoring connection forms with different structures, which can ensure the shear safety of the connection nodes. At the same time, the main load-bearing reinforcement of the frame beam does not need to be fully embedded in the existing frame column, which optimizes the rebar installation position of the traditional connection method and facilitates construction.

[0018] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] Figure 1 This is a top view of the structure of this utility model;

[0020] Figure 2 For the present utility model in Figure 1 The main view structure diagram at point AA.

[0021] Explanation of the markings in the attached drawings: 1. Existing frame column, 2. Shear groove, 3. Ring beam, 4. Frame beam, 5. U-shaped steel bar, 6. Beam longitudinal reinforcement, 7. Beam corner reinforcement, 8. Top longitudinal reinforcement, 9. Bottom longitudinal reinforcement, 10. Web reinforcement, 11. Closed stirrup. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figure 1-2 As shown, a connection node between a newly added concrete frame beam and an existing concrete frame column according to this utility model includes:

[0025] Shear groove 2 is chiseled circumferentially on the outside of the existing frame column 1 at the height of the frame beam 4 to be connected. The vertical length of shear groove 2 is greater than the vertical thickness of frame beam 4. Shear groove 2 is filled with poured concrete.

[0026] The ring beam 3 is arranged around the outer periphery of the shear groove 2, and the concrete of the frame beam 4, the ring beam 3, and the inner side of the shear groove 2 is cast in one piece.

[0027] The shear reinforcement includes U-shaped steel bars 5, longitudinal beam bars 6, and corner beam bars 7. The web of the U-shaped steel bars 5 is anchored in the ring beam 3, and both ends are inserted into and anchored in the existing frame column 1. The longitudinal beam bars 6 are anchored in the frame beam 4 and extend along the length of the corresponding frame beam 4. One end of the longitudinal beam bars 6 facing the existing frame column 1 passes through the ring beam 3 and is inserted into the existing frame column 1 and anchored to the ring beam 3 and the existing frame column 1. The corner beam bars 7 are anchored in the frame beam 4 and extend along the length of the corresponding frame beam 4. One end of the corner beam bars 7 facing the existing frame column 1 passes through the ring beam 3 and is inserted into the shear groove 2 and anchored to the concrete in the ring beam 3 and the shear groove 2.

[0028] The existing concrete frame columns have a square cross-section, forming a square column structure. The ring beam 3 is a ring structure, surrounding the outside of the existing concrete frame columns, with a radial length approximately equal to the side length of the square column. A frame beam 4 is connected to each side of the square column, forming a connection node at the ring beam 3. The ring beam 3 ensures the continuous transmission of internal forces. Holes are drilled in the square column to allow U-shaped steel bars 5 and longitudinal beam reinforcement 6 to pass through. Shear grooves 2 are provided, and the corner reinforcement 7 is anchored to the frame beam 4, ring beam 3, and shear groove 2, respectively, using the integrally cast concrete. The longitudinal beam reinforcement 6 extends from the frame beam 4... Extending within the main structure, the U-shaped steel bar 5 passes sequentially through the ring beam 3 and the shear groove 2 into the existing frame column 1, where it is anchored. The U-shaped steel bar 5 passes through the shear groove 2 within the ring beam 3 and enters the existing frame column 1 for anchoring connection. It works together with the U-shaped steel bar 5, longitudinal reinforcement 6, and corner reinforcement 7 anchored in the concrete within the shear groove 2 as shear reinforcement, and is set in different positions with different structural elements to ensure the shear safety of the connection nodes. At the same time, the main load-bearing steel bars of the frame beam 4 do not need to be fully embedded in the existing frame column 1, optimizing the rebar installation position of the traditional connection method and facilitating construction.

[0029] In another technical solution, such as Figure 1-2 As shown, the top of the ring beam 3 has a row of annular top longitudinal reinforcements 8 spaced radially at the top, and the bottom of the ring beam 3 has a row of annular bottom longitudinal reinforcements 9 spaced radially at the bottom. Annular waist reinforcements 10 are arranged vertically between the top longitudinal reinforcements 8 and the bottom longitudinal reinforcements 9. In the radial vertical plane of the ring beam 3, a closed hoop 11 is welded together on the outer side of the top longitudinal reinforcements 8, the waist reinforcements 10, and the bottom longitudinal reinforcements 9. The closed hoop 11 is anchored in the ring beam 3 and arranged at intervals around the circumference of the ring beam 3.

[0030] The reinforcement arrangement of the ring beam 3 includes top longitudinal bars 8, bottom longitudinal bars 9, web bars 10, and closed stirrups 11. The beam longitudinal bars 6 and beam corner bars 7 radially pass between the top longitudinal bars 8 and the bottom longitudinal bars 9. The beam longitudinal bars 6 are welded to the adjacent top longitudinal bars 8 or bottom longitudinal bars 9, and the beam corner bars 7 are welded to the web bars 10. For multiple top longitudinal bars 8 or bottom longitudinal bars 9 arranged in a row, a first closed reinforcement bar can be welded around the outside of the row of top longitudinal bars 8 and bottom longitudinal bars 9. A second closed reinforcement bar is reinforced by welding between multiple top reinforcement bars and bottom reinforcement bars in the middle of the row. The closed stirrups 11 on the circumference of the ring beam 3 connect and limit the top longitudinal bars 8, bottom longitudinal bars 9, and web bars 10, thereby improving the structural strength of the ring beam 3 and the stability of the connection with the existing frame columns 1 and frame beams 4, and ensuring the safety of force transmission.

[0031] In another technical solution, such as Figure 1-2 As shown, the closed stirrup 11 located in the extension direction of the frame beam 4 passes downward through the inner side of the web of the U-shaped steel bar 5 at the corresponding position and is welded on the side near the shear groove 2.

[0032] Multiple sets of waist reinforcement 10 are arranged vertically at intervals, and the ends of U-shaped steel bars 5 are inserted into the existing frame column 1 to ensure uniform force transmission inside the ring beam 3 and structural stability.

[0033] In another technical solution, such as Figure 1-2 As shown, the longitudinal reinforcement 6 and the corner reinforcement 7 of the beam are arranged sequentially on the upper and lower sides of the ring beam 3. In the vertical direction, the longitudinal reinforcement 6 is located outside the corner reinforcement 7, and the U-shaped steel bar 5 is located between the corner reinforcement 7 on the upper and lower sides. The longitudinal reinforcement 6 is welded to the top longitudinal reinforcement 8 or the bottom longitudinal reinforcement 9 on the corresponding side, and the corner reinforcement 7 is welded to the web reinforcement 10 at the adjacent height.

[0034] In accordance with the characteristics of the concrete-cast beam, a set of longitudinal reinforcement 6 is set at the top and bottom of the frame beam 4, and a set of corner reinforcement 7 is also set at the top and bottom of the inner side between the two sets of longitudinal reinforcement 6. The U-shaped steel bar 5 is located in the middle and is welded to the adjacent steel bar to form a whole. The closed stirrup 11 is located on the outermost side of all the steel bars.

[0035] In another technical solution, such as Figure 1-2 As shown, one end of the beam corner reinforcement 7 is bent at a right angle toward the middle of the ring beam 3 within the shear groove 2, thereby increasing the anchorage size at the shear groove 2 and improving the anchorage strength and shear resistance.

[0036] In another technical solution, such as Figure 1-2 As shown, the thickness of the ring beam 3 is less than the vertical length of the shear groove 2 and greater than the vertical thickness of the frame beam 4, which facilitates the placement of the rebar inside the ring beam 3.

[0037] In another technical solution, such as Figure 1-2 As shown, the shear groove 2 is chiseled to a depth of 30mm in the horizontal direction, the longitudinal reinforcement 6 of the beam is embedded in the existing frame column 1 for 20d (diameter), the corner reinforcement 7 of the beam is bent to the edge for 15d, and the U-shaped reinforcement 5 is embedded in the existing frame column 1 for 20d.

[0038] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the drawings shown and described herein.

Claims

1. A connection node between a newly added concrete frame beam and an existing concrete frame column, characterized in that, include: Shear grooves are chiseled circumferentially on the outside of the existing frame columns at the height of the frame beams to be connected. The vertical length of the shear grooves is greater than the vertical thickness of the frame beams. The shear grooves are filled with poured concrete. The ring beam is set around the outer periphery of the shear groove, and the concrete of the frame beam, the ring beam, and the inner side of the shear groove is cast in one piece. The shear reinforcement includes U-shaped bars, longitudinal bars, and corner bars. The web of the U-shaped bars is anchored in the ring beam, and both ends are inserted into and anchored in the existing frame columns. The longitudinal bars are anchored in the frame beam and extend along the length of the corresponding frame beam. One end of the longitudinal bars facing the existing frame column passes through the ring beam and is inserted into the existing frame column, anchoring to both the ring beam and the existing frame column. The corner bars are anchored in the frame beam and extend along the length of the corresponding frame beam. One end of the corner bars facing the existing frame column passes through the ring beam and is inserted into the shear groove, anchoring to both the ring beam and the concrete in the shear groove. One end of the corner bars in the shear groove is bent at a right angle toward the middle of the ring beam. The longitudinal bars and the corner bars are sequentially arranged on the upper and lower sides of the ring beam.

2. The connection node between a newly added concrete frame beam and an existing concrete frame column as described in claim 1, characterized in that, The top of the ring beam has a row of annular top longitudinal bars spaced radially, and the bottom of the ring beam has a row of annular bottom longitudinal bars spaced radially. Annular waist bars are arranged vertically between the top and bottom longitudinal bars. In the radial and vertical plane of the ring beam, a closed hoop is welded together on the outside of the top, waist, and bottom longitudinal bars. The closed hoop is anchored in the ring beam and arranged at intervals around the circumference of the ring beam.

3. The connection node between a newly added concrete frame beam and an existing concrete frame column as described in claim 2, characterized in that, The closed stirrups located in the extension direction of the frame beam are inserted downwards into the inner side of the web of the U-shaped steel bar at the corresponding position on the side near the shear groove and welded.

4. The connection node between a newly added concrete frame beam and an existing concrete frame column as described in claim 3, characterized in that, In the vertical direction, the longitudinal reinforcement of the beam is located outside the corner reinforcement of the beam, the U-shaped reinforcement is located between the corner reinforcement of the beam on the upper and lower sides, the longitudinal reinforcement of the beam is welded to the top longitudinal reinforcement or the bottom longitudinal reinforcement on the corresponding side, and the corner reinforcement of the beam is welded to the web reinforcement at the adjacent height.

5. The connection node between a newly added concrete frame beam and an existing concrete frame column as described in claim 1, characterized in that, The thickness of the ring beam is less than the vertical length of the shear groove but greater than the vertical thickness of the frame beam.

6. The connection node between a newly added concrete frame beam and an existing concrete frame column as described in claim 1, characterized in that, The shear groove is drilled to a depth of 30mm in the horizontal direction.

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