Beam-slab-column assembly cross-shaped joint adopting steel wedge connection

Abstract

The application discloses a beam-slab-column assembled cross node connected by steel wedges, which comprises a column unit, four beam slabs matched with the column unit, a first opening arranged on each beam slab, a first groove arranged on the inner wall of the first opening, four beam slabs arranged in parallel and spliced to form a second opening, the column unit arranged at the second opening, a plurality of prefabricated part groups prefabricated in the column unit, each prefabricated part group comprising a pair of prefabricated parts, the first groove used for placing the prefabricated parts, a through hole arranged on the column unit and the beam slab, and a steel wedge penetrating through the through hole to fix the beam slab and the prefabricated part groups on the column unit, wherein the opening direction of the through hole is perpendicular to the opening direction of the first groove, and the two first grooves are arranged in perpendicular. The application has reasonable structure, clear force transmission path, extremely simple construction, industrialized batch production, detachable feature, recycling, high economic benefit and high environmental benefit.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated building technology, and in particular relates to a prefabricated cross joint for beams, slabs and columns using steel wedge connections. Background Technology

[0002] Traditional cast-in-place structures, as the mainstream structural form, suffer from drawbacks such as long construction cycles, low industrialization levels, and severe environmental pollution. Precast assembled buildings, on the other hand, have gained widespread acceptance both domestically and internationally in recent years due to their ease of construction, fast construction speed, and good environmental benefits, gradually replacing traditional cast-in-place structures. Beam-column joints, as the main load-bearing components, have become a key research focus. Currently, precast beam-column joint connections are divided into two types: wet connections and dry connections. Wet connections involve prefabricating some components and then connecting them on-site using cast-in-place concrete. While offering better overall integrity, they suffer from construction difficulties and challenges in compacting the concrete. Dry connections involve prefabricating all components in the factory and connecting them on-site using bolts, prestressed steel strands, channels, keys, welding, etc., offering ease of construction but requiring high precision in precast components and exhibiting poor ductility. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated cross joint for beams, slabs and columns using steel wedge connections, in order to solve the problems of high precision requirements and poor ductility of prefabricated components in existing prefabricated beam-column joints.

[0004] To achieve the above objectives, the present invention provides a prefabricated cross joint for beams, slabs and columns using steel wedge connections, comprising: a column unit; and four beams that cooperate with the column unit.

[0005] Each beam slab is provided with a first opening, and each of the two inner walls of the first opening is provided with a first groove extending inward. Four beam slabs are arranged in parallel and spliced ​​to form a second opening. The column unit is placed at the second opening. The column unit is prefabricated with a number of prefabricated component groups. Each prefabricated component group includes a pair of prefabricated components. The first groove is used to place the prefabricated components. Both the column unit and the beam slab are provided with through holes. Steel wedges pass through the through holes to fix the beam slab and the prefabricated component groups on the column unit.

[0006] The opening direction of the through hole is perpendicular to the opening direction of the first groove, and the two first grooves are arranged perpendicularly.

[0007] Optionally, the column unit includes an upper column and a lower column, with the upper column and the lower column in contact connection.

[0008] Optionally, the precast component group includes an upper precast component and a lower precast component, wherein the upper precast component is partially embedded in the upper column, and the lower precast component is partially embedded in the lower column.

[0009] Optionally, at least one fixing member is pre-embedded on the beam plate, and the fixing member is arranged parallel to the first groove.

[0010] Optionally, the fixing member is pre-embedded on the inner side of each of the first grooves, and the thickness of the first groove is half the thickness of the prefabricated member.

[0011] Optionally, the fastener is arranged parallel to the first groove.

[0012] Optionally, the upper preform includes four mutually perpendicular first support plates, each of which has a through hole; the lower preform includes four perpendicularly arranged second support plates and a first flange plate, each of which has a through hole, and the first flange plate is perpendicular to the second support plate.

[0013] Optionally, the fastener has through holes that match the size and shape of the column unit.

[0014] Optionally, the groove formed by the through hole of the lower precast component is lower than the height of the groove in the lower part of the beam slab, forming a height difference, and the groove formed by the through hole of the upper precast component is higher than the height of the groove in the lower part of the beam slab, forming a height difference.

[0015] The technical advantages of this invention are as follows: the structure of this invention has a reasonable stress distribution, a clear force transmission path, is extremely easy to construct, can be mass-produced industrially, and has the characteristics of being detachable and reusable, resulting in high economic and environmental benefits. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a beam-slab-column prefabricated cross joint using steel wedge connections, provided in an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional exploded view of a prefabricated cross-shaped joint for beams, slabs and columns using steel wedge connections, provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the upper column structure provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the lower column structure provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of a beam-slab structure provided in an embodiment of the present invention;

[0022] Figure 6 This is a cross-sectional view of a beam-slab provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the upper preform provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the lower preform provided in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of a fastener provided in an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of a steel wedge provided in an embodiment of the present invention;

[0027] Figure 11 This is a diagram illustrating the steel wedge connection process according to an embodiment of the present invention;

[0028] Figure label:

[0029] 1. Upper column; 2. Lower column; 3. Beam plate; 4. Steel wedge; 5. Upper precast component; 5.1. First support plate; 6. Lower precast component; 6.1. Second support plate; 6.2. Flange plate; 7. Fixing component; 8. First groove; 9. Through hole. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] The following is combined Figure 1-11 This invention describes a prefabricated cross joint for beams, slabs, and columns using steel wedge connections.

[0032] like Figure 1-6 As shown, this embodiment provides a beam-slab-column prefabricated cross joint using steel wedge connections, comprising: a column unit; and four beam-slabs 3 that cooperate with the column unit;

[0033] Each beam slab 3 is provided with a first opening, and a first groove 8 extends inward from the two inner walls of the first opening. Four beam slabs 3 are arranged in parallel and spliced ​​to form a second opening. The column unit is placed at the second opening. Several prefabricated component groups are prefabricated in the column unit. Each prefabricated component group includes a pair of prefabricated components. The first groove 8 is used to place the prefabricated components. Both the column unit and the beam slab 3 are provided with through holes 9. Steel wedges 4 pass through the through holes 9 to fix the beam slab 3 and the prefabricated component groups on the column unit.

[0034] The opening direction of the through hole 9 is perpendicular to the opening direction of the first groove 8, and the two first grooves 8 are arranged perpendicularly.

[0035] The column unit includes an upper column 1 and a lower column 2, with the upper column 1 and the lower column 2 in contact connection.

[0036] In this embodiment, the upper column 1 and the lower column 2 can be precast concrete, such as... Figure 3-4 As shown, the bottom of the upper column 1 has a protrusion, which can be spherical, hemispherical, cylindrical, tetrahedral, etc. The top of the lower column 2 has a groove matching the shape and size of the protrusion, preferably spherical or hemispherical. During installation, the upper column 1 is hoisted into the spherical groove of the lower column 2, forming a temporary joint through gravity and the curvature of the groove. The beam slab 3 is made of precast concrete. The first opening is a rectangular opening on the inner side of the beam slab 3, which can fit against the column wall. The four horizontal beam slabs cooperate to fit against the column wall. Only the contact surfaces of the upper column 1 and lower column 2 need to overlap; no connection is required to fasten the upper column 1, lower column 2, and beam slab 3 together, forming a cross joint. The structure is quickly formed and easy to construct. It has low requirements for the production precision of precast components, allowing for industrialized mass production. It has good integrity and safety. Furthermore, after releasing the steel wedge fastening force, the structural components can be disassembled and reused.

[0037] The multi-layered structure is constructed by splicing the upper column 1 and the lower column 2 in the above steps.

[0038] Furthermore, the upper column 1 and lower column 2 are long enough to install multiple first beam slabs 3, forming a multi-story floor structure.

[0039] Furthermore, the protrusion of the upper column 1 conforms to the following formula:

[0040]

[0041] In the formula: f vd It refers to the shear strength of concrete; A c It is the cross-sectional area of ​​the end.

[0042] In an optional embodiment, such as Figure 7-8As shown, the precast component group includes an upper precast component 5 and a lower precast component 5. The upper precast component 5 is partially embedded in the upper column, and the lower precast component 5 is partially embedded in the lower column.

[0043] In this embodiment, the upper precast component 5 and the lower precast component 6 are pre-embedded in the column unit and are made of steel plate. The lower precast component 6 extends outward on one side by at least half the height of the beam and its width does not exceed the width of the beam.

[0044] Furthermore, the upper precast component 5 and the lower precast component 6 conform to the following formula:

[0045]

[0046] f v b g h g ≥N g

[0047] In the formula: f d It is the design value of the tensile strength of the steel plate; f v This is the design value of the shear strength of the steel plate; b g It refers to the thickness of the steel plate; h g It is the height of the steel plate;

[0048] M g This is the design value of the bending moment; N g This is the shear force design value;

[0049] in:

[0050]

[0051]

[0052] In the formula: A s It is the area of ​​tensile reinforcement on one side; f sd It is the design value of the tensile strength of the reinforcing steel.

[0053] ρ sv It is the stirrup reinforcement ratio f sv L1 is the design value of the tensile strength of the stirrups; L2 is the horizontal distance from the tensile reinforcement to the column centerline; b is the horizontal distance from the center of the steel wedge to the column centerline; h1 is the vertical distance from the center of the steel wedge to the upper edge of the steel plate; h2 is the vertical distance from the center of the steel wedge to the lower edge of the steel plate.

[0054] In an optional embodiment, such as Figure 9 As shown, at least one fixing member 7 is pre-embedded on the beam plate 3, and the fixing member 7 is arranged parallel to the first groove 8. In this embodiment, the fixing member 7 is made of steel plate. The fixing member 7 has at least two through holes 9, and the beam plate 3 has at least four through holes 9.

[0055] Furthermore, the fixing member 7 is pre-embedded on the inner side of each of the first grooves 8, and the thickness of the first groove 8 is half the thickness of the prefabricated part. In this embodiment, the number of the fixing member 7 pre-embedded on each side is one.

[0056] Furthermore, the fixing member 7 is arranged parallel to the first groove 8.

[0057] In an optional embodiment, the upper preform 5 includes four mutually perpendicular first support plates 5.1, each of which has a through hole 9; the lower preform 5 includes four perpendicularly arranged second support plates 6.1 and a first flange plate, each of which has a through hole 9, the first flange plate is perpendicular to the second support plate 6.1, and the flange plate 6.2 is fixedly installed on the lower surface of the second support plate 6.1.

[0058] Furthermore, the fixing member 7 has a through hole 9 that matches the size and shape of the column unit. For example... Figure 10 As shown, the lower end of the steel wedge 4 is threaded, allowing a nut to be screwed in.

[0059] During installation, beam 3 is hoisted onto flange 6.2, with its inner side tightly against the column wall. The rounded rectangular slots at the through holes of the upper precast component 5 and lower precast component 6 are aligned with beam 3. The steel wedges 4, with a certain slope, can be hammered inwards to achieve a clamping effect. Two steel wedges 4 are inserted through the rounded rectangular slots to clamp the upper column 1 and lower column 2 to the adjacent beam 3 via the upper precast component 5 and lower precast component 6, connecting them into a unified whole. Nuts are tightened at one end of the steel wedges 4 to prevent slippage. Following this method, a multi-layer structure can be hoisted and assembled. Temporary supports can be used for fixation during hoisting to ensure structural safety. During disassembly, the nuts at one end of the steel wedges are unscrewed, the wedges are knocked out, and the structure is unloaded sequentially.

[0060] In an optional embodiment, the slot formed by the through hole of the lower precast member 5 is lower than the height of the lower slot in the beam slab 3, forming a height difference, and the slot formed by the through hole of the upper precast member 5 is higher than the height of the lower slot in the beam slab 3, forming a height difference.

[0061] Specifically, such as Figure 11As shown, the height of the rounded rectangular slot formed by the through hole of the lower precast component 6 is slightly lower than the height of the lower slot in the beam slab 3, and the height of the rounded rectangular slot of the upper precast component 5 is slightly higher than the height of the upper slot in the beam slab 3. The steel wedge 4 has a top slope. During the process of driving the steel wedge 4 into the slot, the steel wedge 4 will abut against the upper end of the slot of the lower precast component 6 and the lower end of the lower slot of the beam slab 3, gradually pressing it until the lower column 2 and the beam slab 3 are firmly spliced ​​together; the steel wedge 4 will abut against the lower end of the slot of the upper precast component 5 and the upper end of the upper slot of the beam slab 3, gradually pressing it until the upper column 1 and the beam slab 3 are firmly spliced ​​together. The method can combine the upper column 1, lower column 2 and beam slab 3 into a solid node under the action of the steel wedge 4. The height difference between the upper precast component 5, the lower precast component 6 and the beam slab groove is x, and the slope angle of the steel wedge is α. To ensure that the node has sufficient safety reserve, the groove height difference and the slope angle of the steel wedge can be adjusted during the design to make the node more secure.

[0062] Furthermore, the first support plate 5.1, the second support plate 6.1, and the flange plate 6.2 are all provided with holes for stirrups and reinforcing bars.

[0063] In this embodiment, a fixing piece 7 is pre-embedded on one side of each first groove 8.

[0064] In an optional embodiment, the steel wedge conforms to the following formula:

[0065]

[0066]

[0067] In the formula: f t It is the design value of the tensile strength of the steel wedge; A x N is the area of ​​the steel wedge. x It refers to the shear bearing capacity of the steel wedge;

[0068] in:

[0069] N x =min{2A x f v ,db g f d}

[0070] In the formula: d is the height of the steel wedge; f d It is the design value of the tensile strength of the steel wedge; f v It is the design value of the shear strength of the steel wedge.

[0071] Furthermore, in the above assembly method, the precast concrete column cross sections are all rectangular, and their cross section dimensions are modified according to specific actual needs without being specified; the upper column cross steel plate and the lower column cross T-shaped steel plate are rectangular steel plates, and their cross section dimensions can be selected according to actual conditions and specifications without being specified.

[0072] Furthermore, the size of the steel wedge and the size of the rounded rectangular groove are selected according to actual needs, and no specific requirements are specified.

[0073] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 the embodiments of the present invention 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 the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0075] In the description of this specification, the references to terms such as "an embodiment," "first aspect embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated cross-shaped joint for beams, slabs, and columns using steel wedge connections, characterized in that, include: Column unit; four beams that cooperate with the column unit; Each beam slab is provided with a first opening, and each of the two inner walls of the first opening is provided with a first groove extending inward. Four beam slabs are arranged in parallel and spliced ​​to form a second opening. The column unit is placed at the second opening. The column unit is prefabricated with a number of prefabricated component groups. Each prefabricated component group includes a pair of prefabricated components. The first groove is used to place the prefabricated components. Both the column unit and the beam slab are provided with through holes. Steel wedges pass through the through holes to fix the beam slab and the prefabricated component groups on the column unit. The opening direction of the through hole is perpendicular to the opening direction of the first groove, and the two first grooves are arranged perpendicularly. The column unit includes an upper column and a lower column, and the upper column and the lower column are in contact and connected. The precast component group includes an upper precast component and a lower precast component. The upper precast component is partially embedded in the upper column, and the lower precast component is partially embedded in the lower column. At least one fixing member is pre-embedded on the beam plate, and the fixing member is arranged parallel to the first groove. The upper preform includes four first support plates arranged perpendicularly to each other, each first support plate having a through hole; the lower preform includes four second support plates and a first flange plate arranged perpendicularly, each second support plate having a through hole, and the first flange plate being perpendicular to the second support plate.

2. The prefabricated cross-shaped joint for beams, slabs, and columns using steel wedge connections as described in claim 1, characterized in that, The fixing component is pre-embedded on the inner side of each of the first grooves, and the thickness of the first groove is half the thickness of the prefabricated component.

3. The prefabricated cross-shaped joint for beams, slabs, and columns using steel wedge connections as described in claim 1, characterized in that... The fastener is arranged parallel to the first groove.

4. The prefabricated cross-shaped joint for beams, slabs, and columns using steel wedge connections as described in claim 1, characterized in that... The fastener has through holes that match the size and shape of the column unit.

5. The prefabricated cross-shaped joint for beams, slabs, and columns using steel wedge connections as described in claim 4, characterized in that... The groove formed by the through hole of the lower precast component is lower than the height of the groove in the lower part of the beam slab, forming a height difference. The groove formed by the through hole of the upper precast component is higher than the height of the groove in the lower part of the beam slab, forming a height difference.

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