T-shaped beam punching-resistant structure suitable for conversion plate column joint and construction method

Abstract

The invention discloses a T-shaped beam punching-resistant structure suitable for a conversion plate column joint and a construction method, and relates to the technical field of building structures. The T-shaped beam anti-punching structure suitable for the conversion plate-column joint comprises a steel plate, a T-shaped beam, a T-shaped beam, a T-shaped beam, a T-shaped beam, a T-shaped beam, a T-shaped beam and a T-shaped beam, the multiple studs are welded to the top of the steel plate; the T-shaped beam comprises a cross-shaped wing plate and four web plates mounted at the bottom of the cross-shaped wing plate; through the studs and the plate reinforcing steel bars, efficient combination of the steel plate, the T-shaped beam and the concrete is achieved, reliable force transmission of the plate-column joint is achieved through the column reinforcing steel bars, the punching resistance of the conversion joint is effectively improved, and construction is convenient. And the T-shaped beam adopts a modular design and is integrally connected with the steel plate in a mutual splicing and combining manner, and the T-shaped beam and the steel plate can be fixed without welding except for a triangular prism, so that the assembly efficiency is effectively improved, and all structures are mutually clamped after being assembled, so that the overall strength is ensured.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, specifically to a punching shear structure and construction method for T-beams suitable for transfer slab-column joints. Background Technology

[0002] The transfer slab-column joint, as the core part connecting the floor slab and column in the building structure, is commonly found in flat slab systems as well as shear wall, frame-shear wall and other structural systems. Its design must comprehensively consider factors such as structural safety, ease of construction and durability.

[0003] Current construction methods often employ staged pouring of column concrete and beam / slab concrete, using wire mesh, reinforcing grating, or inflatable airbags to separate concrete of different strength grades, and employing layered vibration and secondary vibration to ensure the compaction of the concrete in the joint area. However, because the slab directly transmits force to the column, the stress is concentrated, and under traditional design, its punching shear resistance is poor. If the punching shear reinforcement is insufficient, brittle punching shear failure can easily occur, leading to major problems such as floor slab collapse. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a punching shear resistance structure and construction method for T-beams suitable for transfer slab-column joints, solving the problem of insufficient punching shear resistance in existing transfer slab-column joint construction methods.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a T-beam punching shear resistance structure suitable for transfer slab-column joints, comprising: Steel plates are placed on the underside of the slab-column joints in the floor slab. Several studs are provided and welded to the top of the steel plate; The T-beam includes a cross-shaped wing plate and four web plates installed at its bottom. The cross-shaped wing plate is fixedly connected to the top of the steel plate through the web plates. The slab reinforcement consists of several bars that penetrate the web of the T-beam and intersect to form a grid pattern. The column reinforcement consists of several longitudinal bars that penetrate the cross flange and steel plate of the T-beam. A central cylinder is fixedly connected to the center of the bottom of the cross-wing plate. The central end of each web plate is inserted into the central cylinder. An upper slot is provided at the central end of the web plate. A lower slot is provided at the bottom of the central cylinder to fit and insert into the upper slot. A hanging groove for hooking the edge of the steel plate is provided at the bottom of the other end of the web plate. A positioning groove for engaging with the hanging groove is provided at the edge of the steel plate. A protruding block is provided at the top of the other end of the web plate. Positioning grooves for inserting with the protruding block are provided at all four ends of the cross-wing plate. The center of the cross wing plate and the steel plate is also provided with a stud mounting hole, and a stud passes through the stud mounting hole. After passing through the steel plate, the central cylinder and the cross wing plate, the stud is locked by a nut. After the column reinforcement is tied, formwork is erected and concrete is poured.

[0006] Preferably, the four sides of the steel plate and the four ends of the cross wing plate are fitted with and welded with triangular prisms, one end of which is open and fitted onto both sides of the web plate.

[0007] Preferably, the web has insertion holes adapted to the slab reinforcement bars, and the insertion holes in the X-axis direction and the Y-axis direction have different heights, so that the slab reinforcement bars in the X-axis direction and the Y-axis direction are stacked and intersected.

[0008] Preferably, the studs are arranged in a non-standard array, the stud post of the stud is located on one side of the intersection node of the plate reinforcement, and the stud cap presses down on the top of the intersection node of the plate reinforcement. A support plate is also welded to the bottom of the steel plate.

[0009] Preferably, the support plate is installed diagonally along the grid structure connected to the plate reinforcement bars, and the support plate is welded after being inserted and positioned with the central cylinder and the steel plate.

[0010] Preferably, the support plate is hollowed out, and a rod is welded to one end and the other end of the top of the support plate. Positioning holes adapted to the rods are opened on the side of the central cylinder and at the corners of the steel plate.

[0011] Preferably, both the T-beam and the steel plate have through holes adapted to the column reinforcement, and the bottom of the steel plate is welded with a U-shaped steel plate covering the through holes.

[0012] This invention also discloses a construction method for a punching shear structure of a T-beam suitable for a transfer slab-column joint, specifically including the following steps: Step 1: First, assemble the T-beam. After welding the cross flange and the center tube in the center, push the four web plates from the periphery towards the center and engage the outer ends of the web plates with the steel plate. Then, fit the center tube into the inner end of the web plate and engage the outer ends of the web plate with the four ends of the cross flange. Next, weld the triangular prism to the four sides of the cross flange and the steel plate. Finally, use a stud to pass through the steel plate, the center tube, and the cross flange in the center and lock it with a nut. This completes the connection between the T-beam and the steel plate. Step 2: When installing the studs, first mark the welding positions of the studs on the steel plate, and then weld the studs onto the steel plate according to the marks; Step 3: When installing the slab reinforcement, pass the slab reinforcement through the web of the T-beam and cross it, and make the slab reinforcement pass between the studs, using the studs to guide the slab reinforcement; Step 4: When installing the support plate, pass the support plate between the steel reinforcement and the steel plate, tap it so that one end of the support plate is inserted into the central tube and the other end is inserted into the steel plate, and then simply weld the support plate. Step 5: Transport the assembled and welded components from Step 4 to the node, level them, insert and tie the column reinforcement bars longitudinally; after setting up the formwork, pour concrete through the pre-reserved pouring holes in the steel plate and cure it.

[0013] This invention provides a punching shear resistance structure and construction method for T-beams suitable for transfer slab-column joints. Compared with the prior art, it has the following advantages: This invention achieves efficient combination of steel plates, T-beams, and concrete components through shear studs and slab reinforcement, and ensures reliable force transmission at the slab-column joint through column reinforcement, effectively improving the punching shear resistance of the transition joint and facilitating construction. Furthermore, the T-beams adopt a modular design, achieving integrated connection with the steel plates through interlocking. Except for the triangular prisms, all components can be fixed without welding, effectively improving assembly efficiency. The interlocking of assembled structures ensures overall strength.

[0014] Furthermore, the unique layout of the studs, which distinguishes it from the traditional standard array, restricts the horizontal direction of the slab reinforcement bars when they are inserted. At the same time, the stud caps support the bottom, and with the support plate, the reinforcement bars are restricted in all directions. This eliminates the need to tie each intersection node, saving construction time and making assembly convenient. Compared with direct tying, the support strength in all directions is also higher. Attached Figure Description

[0015] Figure 1 This is a top perspective view of the present invention; Figure 2 This is a bottom-view perspective view of the present invention; Figure 3 This is an exploded view of the steel plate and T-beam of the present invention; Figure 4 This is a perspective view of the web of the present invention; Figure 5 This is a perspective view of the support plate of the present invention.

[0016] In the diagram: 1-steel plate, 11-positioning slot, 2-stud, 3-T-beam, 31-cross wing plate, 32-web plate, 33-center cylinder, 34-upper slot, 35-lower slot, 36-hanging groove, 37-protrusion, 38-positioning groove, 39-through hole, 310-triangular prism, 311-insertion hole, 312-positioning hole, 4-plate reinforcement, 5-column reinforcement, 6-stud, 7-support plate, 71-insertion rod, 8-U-shaped steel plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figures 1-5 This invention discloses a punching shear resistance structure for T-beams suitable for transfer slab-column joints, comprising: Steel plate 1, located below the column-slab joint of the floor slab, is made of high-strength low-alloy structural steel. This type of steel has high yield strength and good toughness, enabling it to maintain structural stability under heavy loads and reduce deformation caused by external forces. Simultaneously, the surface of steel plate 1 is sandblasted to increase its adhesion to the concrete, allowing the two to work together more effectively to resist external loads. Studs 2, several of which are installed and welded to the top of steel plate 1; the material of studs 2 is high-quality carbon structural steel, and their diameter is precisely calculated based on the stress conditions of the plate-column joint, generally ranging from 10 to 20 mm. The length of studs 2 is also rationally designed to ensure that they can effectively connect steel plate 1 to concrete, enhancing the overall integrity of the structure; T-beam 3, the T-beam 3 includes a cross wing plate 31 and four web plates 32 installed at its bottom, the cross wing plate 31 is fixedly connected to the top of the steel plate 1 through the web plates 32; Several slab reinforcement bars 4 are provided, penetrating the web 32 of the T-beam 3 and intersecting to form a grid pattern. Insertion holes 311, adapted to the slab reinforcement bars 4, are opened within the web 32. The heights of the insertion holes 311 in the X-axis and Y-axis directions are different, allowing the slab reinforcement bars 4 in the X-axis and Y-axis directions to stack and intersect. The slab reinforcement bars 4 are hot-rolled ribbed steel bars, and their strength grade is determined according to design requirements, generally HRB400 or HRB500. The surface of the steel bars has ribs, which increases the friction between the steel bars and concrete, improving the bond performance between the steel bars and concrete. When arranging the slab reinforcement bars 4, construction must be carried out strictly according to the design drawings to ensure that the spacing and anchorage length of the steel bars meet the specifications. The column reinforcement 5 is provided with several longitudinally penetrating the cross flange 31 of the T-beam 3 and the steel plate 1. The interior of the T-beam 3 and the steel plate 1 is provided with through holes 39 that are adapted to the column reinforcement 5. The bottom of the steel plate 1 is welded with a U-shaped steel plate 8 covering the through holes 39. The U-shaped steel plate 8 can support the bottom end of the column reinforcement 5, and the column reinforcement 5 passes through two rows of through holes 39 at the same time, making it more stable vertically. A central cylinder 33 is fixedly connected to the center of the bottom of the cross-shaped wing plate 31. The central ends of the web plates 32 are all inserted into the central cylinder 33. An upper slot 34 is provided at the central end of the web plate 32. A lower slot 35, adapted to the upper slot 34, is provided at the bottom of the central cylinder 33. A hanging groove 36 for hooking the edge of the steel plate 1 is provided at the bottom of the other end of the web plate 32, and a positioning groove 11 that engages with the hanging groove 36 is provided at the edge of the steel plate 1. A protrusion 37 is provided at the top of the other end of the web plate 32. The four ends of the cross wing plate 31 are provided with positioning grooves 38 that are inserted into the protrusions 37. The four sides of the steel plate 1 and the four ends of the cross wing plate 31 are fitted and welded with triangular prisms 310. One end of the triangular prism 310 is open and fits on both sides of the web plate 32. The triangular prism 310 is made of angle steel. The specifications of the angle steel are selected according to the stress of the structure. When welding the triangular prism 310, a full welding process is adopted to ensure the welding quality and enhance the overall stability of the structure. At the same time, the welded parts are treated with anti-corrosion to extend the service life of the structure. The center of the cross wing plate 31 and the steel plate 1 is also provided with a stud mounting hole, and a stud 6 passes through the stud mounting hole. The stud 6 passes through the steel plate 1, the central cylinder 33 and the cross wing plate 31 and is locked by a nut. The stud 6 is a high-strength bolt, and its performance grade is determined according to the design requirements, generally grade 8.8 or grade 10.9. When installing the stud 6, it is strictly tightened according to the specified torque to ensure that the preload of the stud 6 meets the requirements. After the column reinforcement bars 5 are tied, formwork is erected and concrete is poured. When erecting the formwork, qualified formwork materials, such as wooden or steel formwork, should be selected. The joints of the formwork must be tight to prevent grout leakage during concrete pouring. Simultaneously, a release agent should be applied to the inside of the formwork to facilitate its removal. During concrete pouring, layered vibration should be used to ensure the compactness of the concrete. The pouring height and speed of the concrete should be strictly controlled to avoid segregation.

[0019] The studs 2 are arranged in a non-standard array. The studs of the studs 2 are located on one side of the intersection of the plate reinforcement 4, and the stud caps of the studs 2 press down on the top of the intersection of the plate reinforcement 4. A support plate 7 is also welded to the bottom of the steel plate 1. The support plate 7 is installed diagonally along the grid structure connected by the plate reinforcement 4. The support plate 7 is inserted and positioned with the central cylinder 33 and the steel plate 1 and then welded. The support plate 7 is hollowed out. Insert rods 71 ​​are welded to one end and the other end of the top of the support plate 7. Positioning holes 312 that are adapted to the insert rods 71 ​​are opened on the side of the central cylinder 33 and at the corner of the steel plate 1.

[0020] The top surface of the steel plate 1 is flush with the bottom surface of the concrete floor slab. The concrete height at the slab-column joint is the same as the floor slab height. The height of the T-beam 3 is less than that of the floor slab, and a protective layer thickness is provided. The thickness of the protective layer is determined according to design requirements and environmental category, generally ranging from 20-50mm. The protective layer can protect the reinforcing bars and T-beam 3 from external environmental erosion, extending the service life of the structure. During construction, spacers are used to ensure the thickness of the protective layer. The material of the spacers should be similar to that of the concrete, and the strength should not be lower than that of the concrete.

[0021] This invention also discloses a construction method for a punching shear structure of a T-beam suitable for a transfer slab-column joint, specifically including the following steps: Step 1: First, assemble the T-beam 3. After welding the cross flange 31 and the central tube 33 in the center, push the four web plates 32 from the periphery towards the center and make the outer ends of the web plates 32 engage with the steel plate 1. Then, put the central tube 33 on the inner end of the web plate 32 and make the outer ends of the web plates 32 engage with the four ends of the cross flange 31. Then, weld the triangular prism 310 on the four sides of the cross flange 31 and the steel plate 1. Finally, use the stud 6 to pass through the steel plate 1, the central tube 33 and the cross flange 31 in the center and lock it with the nut. This completes the connection between the T-beam 3 and the steel plate 1. Step 2: When installing the stud 2, first mark the welding position of the stud 2 on the steel plate 1, and then weld the stud 2 onto the steel plate 1 according to the marking; Step 3: When installing the slab reinforcement 4, pass the slab reinforcement 4 through the web 32 of the T-beam 3 and cross it, and make the slab reinforcement 4 pass between the studs 2, using the studs 2 to guide the slab reinforcement 4; Step 4: When installing the support plate 7, pass the support plate 7 between the plate reinforcement 4 and the steel plate 1, tap it so that one end of the support plate 7 is inserted into the central cylinder 33 and the other end is inserted into the steel plate 1, and then simply weld the support plate 7. Step 5: Transport the assembled and welded integral component from Step 4 to the node, level it, insert the column reinforcement bars 5 longitudinally and tie them; after setting up the formwork, pour concrete through the pre-reserved pouring hole in the steel plate 1 and cure it.

[0022] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A punching shear resistance structure for T-beams suitable for transfer slab-column joints, characterized in that, include: Steel plates are placed on the underside of the slab-column joints in the floor slab. Several studs are provided and welded to the top of the steel plate; The T-beam includes a cross-shaped wing plate and four web plates installed at its bottom. The cross-shaped wing plate is fixedly connected to the top of the steel plate through the web plates. The slab reinforcement consists of several bars that penetrate the web of the T-beam and intersect to form a grid pattern. The column reinforcement consists of several longitudinal bars that penetrate the cross flange and steel plate of the T-beam. A central cylinder is fixedly connected to the center of the bottom of the cross-wing plate. The central end of each web plate is inserted into the central cylinder. An upper slot is provided at the central end of the web plate. A lower slot is provided at the bottom of the central cylinder to fit and insert into the upper slot. A hanging groove for hooking the edge of the steel plate is provided at the bottom of the other end of the web plate. A positioning groove for engaging with the hanging groove is provided at the edge of the steel plate. A protruding block is provided at the top of the other end of the web plate. Positioning grooves for inserting with the protruding block are provided at all four ends of the cross-wing plate. The center of the cross wing plate and the steel plate is also provided with a stud mounting hole, and a stud passes through the stud mounting hole. After passing through the steel plate, the central cylinder and the cross wing plate, the stud is locked by a nut. After the column reinforcement is tied, formwork is erected and concrete is poured.

2. The punching shear resistance structure of a T-beam suitable for a transfer slab-column joint according to claim 1, characterized in that: The four sides of the steel plate and the four ends of the cross wing plate are all fitted with and welded with triangular prisms, one end of which is open and fitted on both sides of the web plate.

3. The punching shear resistance structure of a T-beam suitable for a transfer slab-column joint according to claim 1, characterized in that: The web has insertion holes adapted to the slab reinforcement bars. The insertion holes in the X-axis direction and the Y-axis direction have different heights, so that the slab reinforcement bars in the X-axis direction and the Y-axis direction are stacked and intersected.

4. A punching shear-resistant T-beam structure suitable for transfer slab-column joints according to claim 2, characterized in that: The studs are arranged in a non-standard array. The stud post of the stud is located on one side of the intersection node of the plate reinforcement, and the stud cap presses down on the top of the intersection node of the plate reinforcement. A support plate is also welded to the bottom of the steel plate.

5. A punching shear-resistant T-beam structure suitable for transfer slab-column joints according to claim 4, characterized in that: The support plate is installed diagonally along the grid structure connected to the plate reinforcement bars, and the support plate is welded after being inserted and positioned with the central cylinder and steel plate.

6. A punching shear-resistant T-beam structure suitable for transfer slab-column joints according to claim 5, characterized in that: The support plate is hollowed out, and a rod is welded to one end and the other end of the top of the support plate. Positioning holes that match the rods are opened on the side of the central cylinder and at the corners of the steel plate.

7. A punching shear-resistant T-beam structure suitable for transfer slab-column joints according to claim 1, characterized in that: Both the T-beam and the steel plate have through holes adapted to the column reinforcement, and the bottom of the steel plate is welded with a U-shaped steel plate covering the through holes.

8. A construction method for a punching shear structure of a T-beam suitable for a transfer slab-column joint according to claim 4, characterized in that: Specifically, the following steps are included: Step 1: First, assemble the T-beam. After welding the cross flange and the center tube in the center, push the four web plates from the periphery towards the center and engage the outer ends of the web plates with the steel plate. Then, fit the center tube into the inner end of the web plate and engage the outer ends of the web plate with the four ends of the cross flange. Next, weld the triangular prism to the four sides of the cross flange and the steel plate. Finally, use a stud to pass through the steel plate, the center tube, and the cross flange in the center and lock it with a nut. This completes the connection between the T-beam and the steel plate. Step 2: When installing the studs, first mark the welding positions of the studs on the steel plate, and then weld the studs onto the steel plate according to the marks; Step 3: When installing the slab reinforcement, pass the slab reinforcement through the web of the T-beam and cross it, and make the slab reinforcement pass between the studs, using the studs to guide the slab reinforcement; Step 4: When installing the support plate, pass the support plate between the steel reinforcement and the steel plate, tap it so that one end of the support plate is inserted into the central tube and the other end is inserted into the steel plate, and then simply weld the support plate. Step 5: Transport the assembled and welded components from Step 4 to the node, level them, insert and tie the column reinforcement bars longitudinally; after setting up the formwork, pour concrete through the pre-reserved pouring holes in the steel plate and cure it.

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