A type of precast floor slab connection node

Abstract

The present invention relates to a fully prefabricated floor slab connection node, comprising a fully prefabricated floor slab and a steel beam. The fully prefabricated floor slab comprises a floor slab body, and shear key slots are arranged at intervals on the end surface of the floor slab body. The shear key slots are recessed into the interior of the floor slab body, and the shear key slots are open outside. Beard bars exposed to the floor slab body are arranged at intervals on the end surface where the shear key slots are located. The beard bars adopt a closed U-shaped structure, and bolt holes are opened along the thickness direction of the floor slab body. The bolt holes penetrate the inner cavity of the shear key slots, and sleeves are embedded on the inner wall opposite to the bolt holes in the shear key slots. When the floor slabs are connected, the beard bars at the ends of two fully prefabricated floor slabs are staggered and overlapped, and a shear steel plate is inserted into each shear key slot. A hole is opened on the shear steel plate, and the shear steel plate is fixed in the shear key slot by bolts. A longitudinal steel bar is arranged in the inner space of the beard bar, and the longitudinal steel bar is tied and fixed with the beard bar, and concrete is poured at the joint of the two fully prefabricated floor slabs. The present invention can enhance the overall force performance and tensile and shear resistance of the floor slab.

Description

Technical Field

[0001] The invention relates to the field of prefabricated buildings, and in particular to a fully prefabricated floor slab connection node. Background Art

[0002] In prefabricated steel structure buildings, the steel structure itself is fully prefabricated. The use of fully prefabricated floor slabs can greatly speed up the construction progress of prefabricated steel structure buildings. The joints of fully prefabricated floor slabs at the steel beam position are a very critical and important node. At present, the more commonly used floor slab connection nodes are partial overlap or dry node forms. Due to the regulatory requirements of the overlap length, the on-site pouring work of partial overlap is relatively large, and it is necessary to pour concrete manually in short-distance transport, which requires a lot of manual work. For large-sized prefabricated floor slabs, the dry node form has a large processing and manufacturing tolerance, and coupled with the installation error of the steel structure, the accuracy is often difficult to meet the design requirements of the dry node.

[0003] In order to reduce the amount of wet work at the construction site and improve the stress performance of the floor, the invention patent with publication number CN113833190A discloses a fully prefabricated floor and its connection node structure and assembled building structure. In the patent, a U-shaped groove is set at the end of the fully prefabricated floor, a hidden beam is built in the U-shaped groove, the stirrups and longitudinal bars of the hidden beam are mutually anchored with the steel truss web in the floor, and concrete is poured at the hidden beam to form a concrete post-cast strip, so as to increase the stress performance of the floor. However, in the patent, the U-shaped groove at the end of the floor runs through the entire end face of the floor. This tongue-and-groove shape is not conducive to the shear stress resistance of the concrete, and the effective cross-section of the hidden beam set in the U-shaped groove only meets the same range as the tongue-and-groove height, and cannot well meet the overall stress requirements of the fully prefabricated floor. Summary of the invention

[0004] The present invention discloses a fully prefabricated floor slab connection node, wherein the fully prefabricated floor slab is preset with a shear key groove and beard bars for forming a hidden beam on a splicing end face; when the floor slab is connected to a steel beam, a shear steel plate is inserted into the shear key groove; the beard bars, the shear steel plate and the longitudinal steel bars form a small hidden beam, which can increase the stress-bearing performance and the tensile and shear resistance of the floor slab as a whole.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A fully prefabricated floor slab connection node comprises a fully prefabricated floor slab and a steel beam, a bolt is arranged on the top of the steel beam, the fully prefabricated floor slab comprises a floor slab body, shear key slots are arranged at intervals on the end surface of the floor slab body, the shear key slots are recessed into the interior of the floor slab body, the shear key slots are open outside, the shear key slots are a wedge-shaped structure that is narrow inside and wide outside, beard ribs exposed to the floor slab body are arranged at intervals on the end surface where the shear key slots are located, the beard ribs adopt a closed U-shaped structure, the width of the beard ribs along the thickness direction of the floor slab body is greater than the width of the shear key slots along the thickness direction of the floor slab body, bolt holes are arranged on the floor slab body in the thickness direction, the bolt holes penetrate the inner cavity of the shear key slots, and sleeves are embedded on the inner wall of the shear key slots opposite to the bolt holes;

[0007] The ends of the two fully precast slabs spliced ​​to each other are placed on the top of the steel beams, the beard bars at the ends of the two fully precast slabs are staggered and overlapped and fit each other, shear steel plates are inserted into each opposite shear keyway of the two fully precast slabs, holes are opened on the shear steel plates, and the shear steel plates are fixed in the shear keyways with bolts in the bolt holes of the fully precast slabs, longitudinal steel bars are arranged in the internal space of the beard bars, and the longitudinal steel bars are tied and fixed to the beard bars, and concrete is poured at the joint of the two fully precast slabs to form a concrete post-cast strip.

[0008] Furthermore, beard ribs are respectively arranged on both sides of the shear key slot.

[0009] Furthermore, the openings on the shear-resistant steel plate include connecting holes and overflow holes, the connecting holes are located at both ends of the shear-resistant steel plate, and the overflow holes are located in the middle of the shear-resistant steel plate.

[0010] Furthermore, the shear-resistant steel plate is a structure with narrow ends and wide middle.

[0011] In the fully prefabricated floor connection node designed by the present invention, an inwardly concave wedge-shaped shear key groove is preset on the splicing end surface of the fully prefabricated floor, and exposed closed U-shaped beard bars are arranged on both sides of the shear key groove, and bolt holes and embedded sleeves are opened at the shear key groove. When the fully prefabricated floor is connected to the steel beam, the shear steel plate can be inserted into the shear key groove, and the shear steel plate and the floor are fixed with bolts. By passing longitudinal steel bars through the inner cavity of the beard bar, the longitudinal steel bars, the beard bar and the shear steel plate are combined to form a small hidden beam. The effective cross-section of the formed hidden beam is the thickness of the entire floor. Compared with the hidden beam and U-shaped groove tongue and groove in the comparative patent mentioned in the background technology, the connection node provided by the present invention can enhance the overall force-bearing performance and tensile and shear resistance of the floor without arranging too many shear keys, which is basically equivalent to the performance of the cast-in-place concrete floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the fully prefabricated floor slab connection node before concrete is poured in the embodiment;

[0013] Figure 2An exploded view of the connection nodes of the fully prefabricated floor slabs in the embodiment;

[0014] Figure 3 for Figure 1 a longitudinal section view of the connection node shown;

[0015] Figure 4 Schematic diagram of the structure of a single shear keyway at the end surface of a fully prefabricated floor slab in an embodiment.

[0016] Description of reference numerals:

[0017] 1. Steel beam; 2. Floor slab body; 21. Shear keyway; 22. Beard reinforcement; 23. Bolt hole; 24. Embedded sleeve; 3. Longitudinal reinforcement; 4. Studs; 5. Shear steel plate; 6. Bolts; 7. Concrete post-cast strip. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] This embodiment discloses a connection node formed by connecting a fully prefabricated floor slab and a steel beam, such as Figures 1 to 4 As shown, the structure of the fully prefabricated floor is first introduced.

[0020] The fully prefabricated floor slab in this embodiment includes a floor slab body 2, and a plurality of shear key grooves 21 are arranged at intervals on the splicing end surface of the floor slab body 2, the shear key grooves 21 are recessed into the interior of the floor slab body 2, and the shear key grooves 21 are open on the exterior. The shear key grooves 21 in this embodiment are wedge-shaped structures, that is, the interior of the shear key grooves 21 is narrow and the exterior is wide. The shear key grooves 21 are arranged as a concave wedge-shaped structure, the purpose of which is, on the one hand, to form a concrete shear key groove, increase the contact surface between the precast concrete and the cast-in-place concrete, and improve the overall horizontal force performance of the floor slab, and on the other hand, a shear steel plate 5 whose end is matched with the wedge-shaped structure can be embedded, and the horizontal tensile and shear resistance of the floor slab can be greatly improved without increasing the reinforcement of the floor slab. The shear key grooves 21 with a wedge-shaped structure are more conducive to improving the shear resistance of concrete. Reinforcement is arranged inside the slab body 2, and a plurality of spaced ribs 22 exposed from the slab body 2 are reserved on the end face where the shear key groove 21 is located. The ribs 22 in this embodiment adopt a closed U-shaped structure, and a rib 22 is arranged on both sides of each shear key groove 21. When the ribs 22 are arranged, the width of the ribs 22 along the thickness direction of the slab body 2 is made greater than the width of the shear key groove 21 along the thickness direction of the slab body 2. In this way, a small hidden beam formed by the longitudinal steel bars 2 inserted in the inner cavity of the ribs 22, the ribs 22 and the shear steel plate 5 has a larger effective cross-section, which can improve the overall force-bearing performance of the slab compared to the hidden beam structure in the patent mentioned in the background technology. In order to fix the shear steel plate 5, in this embodiment, a bolt hole 23 is pre-opened on the floor body 2. The bolt hole 23 is opened along the thickness direction of the floor body 2, so that the top of the bolt hole 23 is open and through, which is convenient for inserting the bolt 6 from the outside of the floor body 2. The lower part of the bolt hole 23 is connected to the inner cavity of the shear key groove 21, and a sleeve 24 is pre-embedded on the inner wall opposite to the bolt hole 23 in the shear key groove 21.

[0021] When the fully prefabricated floor slab of the above-mentioned structure is connected to the H-shaped steel beam 1, a single row of bolts 4 is preset on the top surface of the upper flange of the steel beam 1, and the spliced ​​ends of the two fully prefabricated floor slabs are placed on the top of the upper flange of the steel beam 1. When splicing, the beard bars 22 at the ends of the two fully prefabricated floor slabs are staggered and overlapped with each other and fit together. The longitudinal steel bars 3 pass through the internal cavity of the overlapped beard bars 22, and the longitudinal steel bars 3 are tied and fixed with the beard bars 22 to form a small hidden beam. A shear steel plate 5 is inserted into each of the shear key grooves 21 of the two fully prefabricated floor slabs. The shear steel plate 5 is a structure with narrow ends at two opposite ends and wide in the middle, and its shape just matches the wedge-shaped shear key groove 21. In order to fix the shear steel plate 5, a hole is opened on the shear steel plate 5. The opened hole includes a connection hole and an overflow hole. The connection hole is located at both ends of the shear steel plate 5, and the overflow hole is located in the middle of the shear steel plate 5. The overflow hole will not block the pouring of concrete. Bolts 6 are passed through the connection holes from the bolt holes 23 in sequence and then tightened with the embedded sleeves 24 to fix the shear steel plate 5 in the shear key slot 21. The small hidden beam and the shear steel plate 5 jointly increase the overall force of the floor slab and the combined effect with the steel beam 1. Finally, concrete is poured at the joint of the two fully prefabricated floor slabs to form a concrete post-casting strip 7, so that the fully prefabricated floor slabs and the floor slabs and the steel beam 1 can form an overall force.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fully prefabricated floor slab connection node, comprising a fully prefabricated floor slab and a steel beam, wherein bolts are arranged on the top of the steel beam, and the fully prefabricated floor slab comprises a floor slab body, characterized in that: A non-through shear keyway is arranged at intervals in the middle of the end face of the floor body. The outside of the shear keyway is open. The shear keyway is recessed from the open end to the inside of the floor body to form a wedge-shaped structure that is wide outside and narrow inside in both horizontal and vertical directions. On the end face where the shear keyway is located, on both sides of each shear keyway, there are beard bars exposed to the floor body. The beard bars adopt a closed U-shaped structure. The width of the beard bars along the thickness direction of the floor body is greater than the width of the shear keyway along the thickness direction of the floor body. Bolt holes are arranged on the floor body in the thickness direction. The bolt holes penetrate the inner cavity of the shear keyway. A sleeve is embedded on the inner wall of the shear keyway opposite to the bolt hole. The ends of the two fully precast slabs spliced ​​to each other are placed on the top of the steel beams, the beard bars at the ends of the two fully precast slabs are staggered and overlapped and fit each other, and shear steel plates are inserted into each opposite shear keyway of the two fully precast slabs. The shear steel plates are narrow at the two opposite ends and wide in the middle. Connecting holes are provided at both ends of the shear steel plates, and overflow holes are provided in the middle of the shear steel plates. The shear steel plates are fixed in the shear keyways with bolts in the bolt holes of the fully precast slabs, and longitudinal steel bars are respectively arranged at the upper and lower ends of the internal space of the beard bars, and the longitudinal steel bars are tied and fixed to the beard bars, and concrete is poured at the joint of the two fully precast slabs to form a concrete post-cast strip.

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