A beam-column connection structure for newly built interlayer in existing building

Abstract

The utility model relates to the technical field of existing building reconstruction and extension, especially relates to a beam column connecting structure for new built interlayer in existing building, which comprises a plurality of shear reinforcement implanted outside the original structure column, a reinforcing sleeve arranged around the original structure column and the shear reinforcement, and a filling layer filled between the original structure column and the reinforcing sleeve, wherein the shear reinforcement is implanted at the position of the interlayer beam, the position is surrounded and welded by a steel plate with bolt nails, the gap between the steel plate and the original structure column is filled after the position is adjusted, and high-strength grouting material is used, two groups of T-shaped plates are welded on the side where the interlayer beam is rooted, and the T-shaped plates are connected by steel reinforcement welding, the overhanging length of the T-shaped plate is generally not less than the width of the interlayer beam orthogonal to it. A prefabricated hole is opened at the lower end of the T-shaped plate, so that the interlayer beam reinforcement can pass through and the damage to the original structure is reduced, the structure after completion is more solid and durable, and the utility model can be installed conveniently and has low cost.

Description

Technical Field

[0001] This utility model relates to the field of existing building renovation and expansion technology, and in particular to a beam-column connection structure for newly built mezzanine floors in existing buildings. Background Technology

[0002] During the renovation and expansion of existing structures, mezzanines are sometimes added to each floor to meet new functional requirements. A key issue is how to effectively connect the mezzanine beams and slabs with the original structure while ensuring safety and reliability. In most cases, rebar anchoring is chosen. However, compared to pre-embedded rebar, rebar anchoring is a form of post-anchoring, leading to significant stress concentration in the joint area and making it prone to slippage or fatigue failure under repeated loading. Typically, the newly added mezzanine rebar anchoring is located in the non-stirrup-reinforced zone in the middle of the frame columns. If the design is unreasonable, rebar breakage (steel failure), colloidal shear failure, or concrete conical failure may occur. To ensure effective connection at the joints, a structural design that is easy to install and low in cost is needed, resulting in a more robust and durable completed structure. Utility Model Content

[0003] The purpose of this utility model is to provide a beam-column connection structure for newly built mezzanine floors in existing buildings, which solves the problem of how to ensure effective connection of connection nodes and convenient installation and construction when designing conventional beam-column connection structures for newly built mezzanine floors in existing buildings.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides a beam-column connection structure for a newly built mezzanine in an existing building, including multiple shear bars implanted outside the original structural column, a reinforcing sleeve arranged around the periphery of the original structural column and the shear bars, and a filling layer between the original structural column and the reinforcing sleeve.

[0006] The inner wall of the reinforcing sleeve is provided with multiple studs, and the filling layer is grout.

[0007] At least one set of interlayer beam reinforcement brackets is provided on the outer wall of the reinforcing sleeve; the interlayer beam reinforcement brackets include two T-shaped plates vertically arranged on the outer wall of the reinforcing sleeve and additional bottom reinforcement connecting the two T-shaped plates.

[0008] In this embodiment, the reinforcing sleeve is a steel sleeve, which includes steel plates spliced ​​on four sides, and studs are fixedly installed on the steel plates.

[0009] Furthermore in this embodiment, the T-shaped plate includes a web perpendicular to the reinforcing sleeve and an outward projection at the bottom of the web; wherein the outward projections of two adjacent T-shaped plates are connected by multiple additional bottom reinforcement bars; and multiple prefabricated holes for the passage of the mezzanine beam reinforcement bars are provided at the bottom of the web.

[0010] Furthermore, in this embodiment, two sets of interlayer beam reinforcement supports are symmetrically arranged on the outer wall of the reinforcing sleeve.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] In this invention, shear-resistant steel bars are inserted at the location of the mezzanine beam, and then a steel plate with studs is used to surround and weld the location. After adjusting the position, high-strength grout is used to fill the gap between the steel plate and the original structural column. Two sets of T-shaped plates are welded to one side of the mezzanine beam and connected by steel bars. The overhang length of the T-shaped plates is generally not less than the width of the mezzanine beam orthogonal to it. Pre-drilled holes are made at the lower end of the T-shaped plates to allow the mezzanine beam reinforcement to pass through, reducing damage to the original structure. This invention achieves convenient installation, low cost, and a more robust and durable completed structure. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of one embodiment of the beam-column connection structure of the present invention for use in the construction of a new mezzanine in an existing building;

[0015] Figure 2 This is a schematic diagram of another embodiment of the beam-column connection structure of the present invention for use in newly constructed mezzanine floors within existing buildings;

[0016] Figure 3 for Figure 1 Top view of the structure;

[0017] Figure 4 for Figure 2 Side view structural diagram.

[0018] Explanation of reference numerals in the attached drawings: 1. Original structural column; 2. Reinforcing sleeve; 21. Stud; 22. Shear reinforcement; 3. Infill layer; 4. T-shaped plate; 41. Web; 42. Cantilever; 43. Precast hole; 5. Additional bottom reinforcement. Detailed Implementation

[0019] refer to Figure 1This embodiment discloses a beam-column connection structure for constructing a new mezzanine in an existing building, including multiple shear bars 22 implanted outside the original structural column 1, a reinforcing sleeve 2 installed around the periphery of the original structural column 1 and the shear bars 22, and a filling layer 3 filling the space between the original structural column 1 and the reinforcing sleeve 2; wherein the inner wall of the reinforcing sleeve 2 is equipped with multiple studs 21, and the filling layer 3 is grouting material (specifically high-strength grout); a set of mezzanine beam reinforcement supports are installed on the outer wall of the reinforcing sleeve 2; the mezzanine beam reinforcement supports include two T-shaped plates 4 vertically installed on the outer wall of the reinforcing sleeve 2, and additional bottom reinforcement bars 5 connecting the two T-shaped plates 4.

[0020] In this embodiment, the reinforcing sleeve 2 is a steel sleeve, which includes steel plates spliced ​​on four sides, and studs 21 are fixedly installed on the steel plates. The T-shaped plate 4 includes a web plate 41 perpendicular to the reinforcing sleeve 2 and an overhang 42 installed at the bottom of the web plate 41; wherein the overhangs 42 of two adjacent T-shaped plates 4 are connected by multiple additional bottom reinforcement bars 5; multiple prefabricated holes 43 for the passage of the mezzanine beam reinforcement bars are opened at the bottom of the web plate 41.

[0021] As another implementation method, refer to Figure 2 Two sets of sandwich beam reinforcement supports are symmetrically installed on the outer wall of the reinforcing sleeve 2.

[0022] The installation method of this utility model involves first inserting shear reinforcement bars into the mezzanine beam location, then surrounding and welding the location with a reinforcing sleeve equipped with studs. After adjusting the position, high-strength grout is used to fill the gap between the reinforcing sleeve and the original structural column. Two sets of T-shaped plates are welded to one side of the mezzanine beam where it is anchored and connected by welding reinforcing bars. The overhang length of the T-shaped plates is generally not less than the width of the mezzanine beam orthogonal to it. An opening is made at the bottom of the T-shaped plates to allow the mezzanine beam reinforcement bars to pass through, reducing damage to the original structure.

[0023] The specific operating steps during construction are as follows:

[0024] Determine the location and dimensions of the mezzanine beam. Insert φ14 shear reinforcement bars in a staggered pattern at 300mm intervals within a 1000mm range above the beam bottom elevation, ensuring the exposed length is less than 90mm. Cut four 10mm thick reinforcing sleeves (Q355B) according to the column width, with a width 200mm wider than the column width. Weld φ20 studs at 200mm intervals on the inner side, with a length less than 90mm. Perform manual welding on site. After welding, seal the bottom of the component, pour high-strength grout to fill the gaps, and wait for the strength to reach 75% before proceeding with subsequent welding. Weld two T-shaped reinforcing sleeves (400*300*14*14mm) at the anchor point of the mezzanine beam, each 500mm long. The width between the webs of the T-shaped reinforcing sleeves should be the width of the mezzanine beam. Weld four additional φ20 bottom reinforcement bars to both sides of the flanges of the T-shaped reinforcing sleeves. Make circular holes in the webs of the T-shaped reinforcing sleeves to allow the mezzanine beam reinforcement bars in the direction perpendicular to the mezzanine beam to pass through normally.

[0025] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A beam-column connection structure for constructing a new mezzanine in an existing building, characterized in that: It includes multiple shear bars (22) implanted outside the original structural column (1), a reinforcing sleeve (2) arranged around the periphery of the original structural column (1) and the shear bars (22), and a filling layer (3) filled between the original structural column (1) and the reinforcing sleeve (2); The inner wall of the reinforcing sleeve (2) is provided with a plurality of studs (21), and the filling layer (3) is grout; At least one set of interlayer beam reinforcement brackets is provided on the outer wall of the reinforcing sleeve (2); the interlayer beam reinforcement brackets include two T-shaped plates (4) vertically arranged on the outer wall of the reinforcing sleeve (2) and additional bottom reinforcement (5) connecting the two T-shaped plates (4).

2. The beam-column connection structure for newly constructed mezzanine floors in existing buildings according to claim 1, characterized in that: The reinforcing sleeve (2) is a steel sleeve, which includes steel plates spliced ​​on four sides, and studs (21) are fixedly installed on the steel plates.

3. The beam-column connection structure for newly constructed mezzanine floors in existing buildings according to claim 2, characterized in that: The T-shaped plate (4) includes a web (41) perpendicular to the reinforcing sleeve (2) and an overhang (42) at the bottom of the web (41); wherein the overhangs (42) of two adjacent T-shaped plates (4) are connected by multiple additional bottom bars (5); multiple prefabricated holes (43) for the passage of the mezzanine beam reinforcement are provided at the bottom of the web (41).

4. The beam-column connection structure for newly constructed mezzanine floors in existing buildings according to claim 2, characterized in that: Two sets of interlayer beam reinforcement supports are symmetrically arranged on the outer wall of the reinforcing sleeve (2).

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