T-shaped beam anti-punching construction suitable for floor slab column joint and construction method

Abstract

The application discloses a T-shaped beam anti-punching construction suitable for a floor slab column joint and a construction method, and relates to the technical field of building structures. The T-shaped beam anti-punching construction suitable for the floor slab column joint comprises a steel plate arranged on the upside of the floor slab column joint, a plurality of bolt nails welded at the bottom of the steel plate, a T-shaped beam in a cross shape when viewed from above and welded at the bottom of the steel plate through the web of the T-shaped beam, a plurality of plate steels penetrating through the web of the T-shaped beam and crossing to form a grid type, and a plurality of column steels longitudinally penetrating through the flange of the T-shaped beam and the steel plate. The steel plate, the T-shaped beam and concrete are efficiently combined through the bolt nails and the plate steels, reliable force transmission of the floor slab column joint is realized through the column steels, the anti-punching capacity of the floor slab column joint is effectively improved, and the construction is convenient. Moreover, the binding of each cross joint can be directly omitted, and the construction time is saved.

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 applicable to floor slab-column joints. Background Technology

[0002] The slab-column joint is a key part of the building structure that connects the slab and the column. It mainly appears in flat slab systems and structural systems such as shear walls and frame-shear walls. Its design must take into account structural safety, construction convenience and durability requirements.

[0003] When constructing the slab-column joint, a method of staged pouring of column concrete and beam-slab concrete is often adopted. That is, the column concrete is poured up to the bottom of the beam first, and then the beam-slab concrete is poured. Different strength grades of concrete are separated by measures such as wire mesh, steel grid or inflatable airbags. At the same time, layered vibration and secondary vibration techniques are used to ensure the compactness of the concrete in the joint area. However, due to the stress characteristics of the slab directly transmitting the force to the column, the joint is prone to the formation of highly concentrated shear stress and bending stress in the joint area, resulting in insufficient punching shear resistance under traditional design. Especially when punching shear reinforcement is not provided or is insufficient, it may cause brittle punching shear failure and serious consequences such as floor collapse. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a T-beam punching shear resistance structure and construction method suitable for floor slab-column joints, solving the problem of insufficient punching shear resistance in existing floor 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 floor slab-column joints, comprising:

[0006] Steel plates are placed on the upper side of the slab-column joints in the floor slab;

[0007] Several studs are provided and welded to the bottom of the steel plate;

[0008] The T-beam, which is cross-shaped when viewed from above, is welded to the bottom of a steel plate through its web;

[0009] The slab reinforcement consists of several bars that penetrate the web of the T-beam and intersect to form a grid pattern.

[0010] The column reinforcement consists of several bars that run longitudinally through the flange and steel plate of the T-beam;

[0011] 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 slab reinforcement, and the stud cap supports the bottom of the intersection node of the slab reinforcement. A support plate is also welded to the bottom of the steel plate.

[0012] After the column reinforcement is tied, formwork is erected and concrete is poured.

[0013] Preferably, the web of the T-beam 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.

[0014] Preferably, both the T-beam and the steel plate have through holes adapted to the column reinforcement.

[0015] Preferably, a central cylinder is fixedly connected to the center of the four webs of the T-beam, and one end of the center of each of the four webs of the T-beam is inserted and assembled with the central cylinder.

[0016] 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.

[0017] 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.

[0018] Preferably, one end of the web of the T-beam is provided with an upper slot, and the bottom of the central cylinder is provided with a lower slot that is adapted to be inserted into the upper slot.

[0019] Preferably, the steel plate has a pouring hole inside for pouring concrete downwards.

[0020] This invention also discloses a construction method for a punching shear structure of a T-beam suitable for floor slab-column joints, specifically including the following steps:

[0021] Step 1: First, insert and fix the web plate and center tube of the T-beam, then weld and fix it to the flange plate, and then weld the welded T-beam onto the steel plate.

[0022] Step 2: Mark the welding positions of the studs on the steel plate, and weld the studs onto the steel plate according to the marks;

[0023] Step 3: Pass the slab reinforcement bars through the web of the T-beam and cross them, and let the slab reinforcement bars pass between the studs, using the studs to guide the slab reinforcement bars;

[0024] Step 4: 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.

[0025] 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.

[0026] This invention provides a punching shear resistance structure and construction method for T-beams suitable for slab-column joints. Compared with the prior art, it has the following advantages:

[0027] This invention achieves an efficient combination of steel plates, T-beams, and concrete components through studs and slab reinforcement. Reliable force transmission at the slab-column joint is achieved through column reinforcement, effectively improving the punching shear resistance of the joint and facilitating construction. Furthermore, the unique layout of the studs, distinct from traditional standard arrays, restricts the horizontal direction of the slab reinforcement during insertion by the stud posts. Simultaneously, the stud caps provide bottom support, and with the support plate, the reinforcement is restricted in all directions. This eliminates the need for binding at each intersection, saving construction time and simplifying assembly. Compared to direct binding, the support strength in all directions is also higher. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the flipping of a partial structure of the present invention;

[0030] Figure 3 For the present invention Figure 2 Top view;

[0031] Figure 4 This is an exploded view of the T-beam of the present invention;

[0032] Figure 5 This is a schematic diagram of the T-beam flange of the present invention;

[0033] Figure 6 This is a schematic diagram of the support plate of the present invention.

[0034] In the diagram: 1-steel plate, 11-pouring hole, 2-stud, 3-T-beam, 31-insertion hole, 32-through hole, 33-center cylinder, 34-upper slot, 35-lower slot, 4-slab reinforcement, 5-column reinforcement, 6-support plate, 61-insertion rod, 7-positioning hole. Detailed Implementation

[0035] 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.

[0036] See Figures 1-6 As shown, this invention discloses a T-beam punching shear resistance structure suitable for floor slab-column joints, comprising:

[0037] Steel plate 1 is placed on the upper side of the slab-column joint in the floor slab. Steel plate 1 is made of Q345B grade low alloy high-strength structural steel, and its thickness is determined according to the punching force of the joint (usually 10-20mm). Its surface needs to be sandblasted to remove rust and coated with anti-rust paint. The edges of steel plate 1 are chamfered at 45° to avoid stress concentration, and bolt holes for fixing to the formwork are reserved.

[0038] Shear studs 2, several of which are provided and welded to the bottom of steel plate 1; shear studs 2 are made of ML15 aluminum manganese alloy steel, and their shear bearing capacity needs to be verified by the "Steel Structure Design Standard" (GB50017);

[0039] T-beam 3, which is cross-shaped when viewed from above, is welded to the bottom of steel plate 1 through its web;

[0040] The slab reinforcement 4 consists of several bars that penetrate the web of the T-beam 3 and intersect to form a grid pattern. The slab reinforcement 4 is made of HRB400 grade threaded steel with a diameter of 12-16mm and a spacing of 100-150mm. The web of the T-beam 3 has insertion holes 31 that are compatible with the slab reinforcement 4. The insertion holes 31 in the X-axis direction and the Y-axis direction have different heights, so that the slab reinforcement 4 in the X-axis direction and the Y-axis direction are stacked and intersected.

[0041] The column reinforcement 5 is provided with several bars, which longitudinally penetrate the flange of the T-beam 3 and the steel plate 1. The interior of the T-beam 3 and the steel plate 1 are provided with through holes 32 that are compatible with the column reinforcement 5.

[0042] The studs 2 are arranged in a non-standard array. The stud post of the stud 2 is located on one side of the intersection node of the plate reinforcement 4, and the stud cap of the stud 2 supports the bottom of the intersection node of the plate reinforcement 4. A support plate 6 is also welded to the bottom of the steel plate 1.

[0043] After the column reinforcement 5 is tied, formwork is erected and concrete is poured. The steel plate 1 has pouring holes 11 inside for pouring concrete downwards. The diameter of the pouring holes 11 is 150-200mm, and four are symmetrically arranged along the center of the steel plate 1. PVC sleeves are installed inside the holes to prevent concrete blockage. A layered vibration compaction process is used during pouring, with each layer not exceeding 500mm in thickness, ensuring that the concrete density in the joint area reaches over 95%.

[0044] The four webs of the T-beam 3 are fixedly connected to a central cylinder 33, and one end of each of the four webs of the T-beam 3 is inserted into and assembled with the central cylinder 33.

[0045] The support plate 6 is installed diagonally along the grid structure connected to the plate steel bars 4. The support plate 6 is welded after being inserted and positioned with the central cylinder 33 and the steel plate 1. An upper slot 34 is provided at one end of the web of the T-beam 3, and a lower slot 35 adapted to the upper slot 34 is provided at the bottom of the central cylinder 33.

[0046] The support plate 6 is hollowed out, and a rod 61 is welded to one end and the other end of the top of the support plate 6. Positioning holes 7 that are adapted to the rod 61 are opened on the side of the central cylinder 33 and at the corner of the steel plate 1.

[0047] The bottom surface of steel plate 1 is flush with the top surface of the concrete floor slab, the concrete height at the plate-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.

[0048] This invention achieves an efficient combination of three components: steel plate 1, T-beam 3, and concrete, through studs 2 and slab reinforcement 4. Reliable force transmission at the slab-column joint is achieved through column reinforcement 5, effectively improving the punching shear resistance of the slab-column joint and facilitating construction. Furthermore, the unique layout of studs 2, which differs from traditional standard arrays, restricts the horizontal direction of the slab reinforcement 4 when it is inserted, while the stud caps of studs 2 provide bottom support. Combined with the support plate 6, this achieves directional restriction of the slab reinforcement 4, eliminating the need for binding at each intersection, saving construction time, facilitating assembly, and providing higher directional support strength compared to direct binding.

[0049] This invention also discloses a construction method for a punching shear structure of a T-beam suitable for floor slab-column joints, specifically including the following steps:

[0050] Step 1: First, insert and fix the web plate of T-beam 3 and the central tube 33, then weld and fix them to the flange plate, and then weld the welded T-beam 3 onto the steel plate 1.

[0051] Step 2: Mark the welding positions of the studs 2 on the steel plate 1, and weld the studs 2 onto the steel plate 1 according to the markings;

[0052] Step 3: Pass the slab reinforcement 4 through the web 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;

[0053] Step 4: Pass the support plate 6 through the space between the steel bar 4 and the steel plate 1, tap it so that one end of the support plate 6 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 6.

[0054] Step 5: Transport the assembled and welded integral component from Step 4 to the node, level it, insert the column reinforcement 5 longitudinally and tie it; after setting up the formwork, pour concrete through the pre-reserved pouring hole in the steel plate 1 and cure it.

[0055] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0056] 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.

[0057] 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 slab-column joints, characterized in that, include: Steel plates are placed on the upper side of the slab-column joints in the floor slab; Several studs are provided and welded to the bottom of the steel plate; The T-beam, which is cross-shaped when viewed from above, is welded to the bottom of a steel plate through its web; 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 bars that run longitudinally through the flange and steel plate of the T-beam; 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 slab reinforcement, and the stud cap supports the bottom of the intersection node of the slab reinforcement. A support plate is also welded to the bottom of the steel plate. After the column reinforcement is tied, formwork is erected and concrete is poured.

2. The T-beam punching shear resistance structure applicable to floor slab-column joints according to claim 1, characterized in that: The web of the T-beam has insertion holes adapted to the slab reinforcement. The insertion holes in the X-axis direction and the Y-axis direction have different heights, so that the slab reinforcement in the X-axis direction and the Y-axis direction are stacked and intersected.

3. The T-beam punching shear resistance structure applicable to floor slab-column joints according to claim 1, characterized in that: Both the T-beam and the steel plate have through holes inside that are compatible with the column reinforcement.

4. The T-beam punching shear resistance structure applicable to floor slab-column joints according to claim 1, characterized in that: The four webs of the T-beam are fixedly connected to a central tube, and one end of each of the four webs of the T-beam is inserted into and assembled with the central tube.

5. A T-beam punching shear resistance structure suitable for floor 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 T-beam punching shear resistance structure suitable for floor slab-column joints according to claim 4, 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 T-beam punching shear resistance structure suitable for floor slab-column joints according to claim 4, characterized in that: The web of the T-beam has an upper slot at one end, and the bottom of the central cylinder has a lower slot that is adapted to be inserted into the upper slot.

8. A T-beam punching shear resistance structure applicable to floor slab column joints according to claim 1, characterized in that: The steel plate has pouring holes inside for pouring concrete downwards.

9. A construction method for a T-beam punching shear structure applicable to floor slab-column joints according to any one of claims 6-7, characterized in that: Specifically, the following steps are included: Step 1: First, insert and fix the web plate and center tube of the T-beam, then weld and fix it to the flange plate, and then weld the welded T-beam onto the steel plate. Step 2: Mark the welding positions of the studs on the steel plate, and weld the studs onto the steel plate according to the marks; Step 3: Pass the slab reinforcement bars through the web of the T-beam and cross them, and let the slab reinforcement bars pass between the studs, using the studs to guide the slab reinforcement bars; Step 4: 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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