Prefabricated beam-column joint structure adopting vertical angle steel and construction method of prefabricated beam-column joint structure

Abstract

The invention provides a prefabricated beam-column joint structure adopting vertical angle steel and a construction method of the prefabricated beam-column joint structure. The joint structure comprises a concrete prefabricated upper column, a concrete prefabricated lower column, a concrete prefabricated left beam, a concrete prefabricated right beam and angle steel connecting pieces. The concrete prefabricated upper column and the concrete prefabricated lower column are connected through angle steel connecting pieces, the angle steel connecting pieces comprise the upper angle steel connecting piece and the lower angle steel connecting piece, and one end of the upper angle steel connecting piece and one end of the lower angle steel connecting piece are embedded in the concrete prefabricated upper column and the concrete prefabricated lower column respectively. The other end is connected with the node core area; one end of the concrete prefabricated left beam and one end of the concrete prefabricated right beam are connected with each other in the joint core area and each comprise a prefabricated concrete layer and a cast-in-place laminated layer, and cast-in-place concrete is arranged in the joint core area. The mode that the prefabricated beam columns are connected through the vertical angle steel is adopted, and the connecting performance between beam column joint structures is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated and assembled building structure engineering, and in particular to a prefabricated and assembled beam-column node structure using vertical angle steels and a construction method thereof. Background Art

[0002] Prefabricated buildings are widely adopted due to their advantages, including fast construction, minimal environmental pollution, and easy quality control. Beam-column joints are crucial components of building structures, and their connection method significantly impacts the stability and seismic performance of the entire structure. Existing prefabricated beam-column joint structures have limitations in their connection methods, requiring further optimization to improve their performance.

[0003] In traditional prefabricated concrete structures, the sleeve grouting or welding connection methods commonly used in beam-column joints have problems such as complex construction, difficult quality inspection, and weakened component cross-section. Summary of the Invention

[0004] In order to at least solve one of the deficiencies of the existing prior art, the present invention provides a prefabricated assembled beam-column node structure using vertical angle steel and a construction method thereof. The method of connecting prefabricated beams and columns using vertical angle steel greatly improves the connection performance between the beam-column node structures, and has the characteristics of good construction convenience and high production efficiency.

[0005] In order to achieve the purpose of the present invention, the present invention provides a prefabricated assembled beam-column node structure using vertical angle steel, including a prefabricated concrete upper column, a prefabricated concrete lower column, a prefabricated concrete left beam, a prefabricated concrete right beam and an angle steel connector;

[0006] The precast concrete upper column and the precast concrete lower column are connected by an angle steel connector, which includes an upper angle steel connector and a lower angle steel connector. One end of the upper angle steel connector and the lower angle steel connector are respectively embedded in the precast concrete upper column and the precast concrete lower column, and the other ends are connected to each other at the core area of the node;

[0007] One ends of the precast concrete left beam and the precast concrete right beam are connected to each other in the core area of the node, both of which include a precast concrete layer and a cast-in-place superimposed layer, and cast-in-place concrete is arranged in the core area of the node.

[0008] Furthermore, the precast concrete upper column is provided with a post-casting port connected to the node core area. After the precast beams and precast columns are assembled and positioned, the node core area and the beam superposition layer concrete are poured through the post-casting port of the precast upper column to form an integral load-bearing structure.

[0009] Furthermore, the cross-sectional dimensions of the post-casting gate meet the concrete fluidity requirements of the core area of the node and cover the entire welding area of the angle steel connector.

[0010] Furthermore, the precast concrete left beam and the precast concrete right beam also include longitudinal beam reinforcement and transverse beam stirrups. One end of the longitudinal beam reinforcement located at the bottom of the precast concrete left beam and the precast concrete right beam is overlapped through an anchor end in the core area of the node, and the outer surface of the anchor end forms a mechanical interlocking connection with the post-cast concrete in the core area of the node.

[0011] Furthermore, the distance between adjacent anchoring ends is not less than 50 mm.

[0012] Furthermore, a cast-in-place composite layer is provided on the top of the beam, and the longitudinal reinforcement of the beam top passes through the core area of the node. After the prefabricated beam is assembled, the core area of the node and the composite layer concrete are poured at one time through the post-casting gate.

[0013] Furthermore, the cast-in-situ superimposed layer is located on top of the precast concrete layer, and the cast-in-situ superimposed layer covers the longitudinal reinforcement of the top of the precast concrete left beam and the precast concrete right beam and the transverse stirrups of the beam extending out of the precast concrete layer.

[0014] Furthermore, the upper and lower angle steel connectors each include multiple angle steels and transverse connecting plates, with the multiple angle steels connected by the transverse connecting plates to form a box-shaped frame structure. Connecting the angle steels via the transverse connecting plates can improve the overall shear resistance of the structure.

[0015] Furthermore, the position of the transverse connecting plate is adjustable, so that there is enough space for the longitudinal reinforcement and beam structure of the precast beam to pass through the angle steel connector.

[0016] Furthermore, four angle steels are symmetrically arranged at the connection interface between the precast concrete upper column and the precast concrete lower column, and the flange side of each angle steel is connected to the transverse connecting plate through high-strength bolts; the transverse connecting plate extends circumferentially along the column section, connecting the four angle steels to each other to form a closed box-type frame structure, thereby realizing the coordinated transmission of the upper and lower column loads.

[0017] Furthermore, the embedded depth of the upper angle steel connector and the lower angle steel connector in the precast concrete upper column and the precast concrete lower column is 100mm to 200mm, the length of the upper angle steel connector extending from the precast concrete upper column is 30mm to 60mm, and the length of the lower angle steel connector extending from the precast concrete lower column is 400 to 600mm. The protruding part serves as a node domain angle steel and is connected to the upper angle steel connector by a butt weld.

[0018] Furthermore, the precast concrete upper column and the precast concrete lower column both include column longitudinal reinforcement, column transverse stirrups and precast concrete, and the column longitudinal reinforcement is connected to the angle steel connector.

[0019] The longitudinal reinforcements of the upper and lower prefabricated columns are welded to the inner side of the angle steel connectors respectively. The angle steel connectors are connected up and down by butt welds. The core area of the node and the beam superposition layer are formed into an integral load-bearing structure by post-poured concrete.

[0020] Furthermore, the column longitudinal reinforcement in the precast concrete upper column is welded to the inner side of the upper angle steel connector with a double-sided fillet weld and extends 100mm to 200mm beyond the upper angle steel connector, and the column longitudinal reinforcement in the precast concrete lower column is connected to the angle steel connector located in the core area of the node.

[0021] The upper angle steel connector and the lower angle steel connector are respectively embedded in the prefabricated upper and lower columns and extend out of the columns to the core area of the node, and then connected up and down by butt welds.

[0022] The present invention provides a construction method for a prefabricated assembled beam-column node structure using vertical angle steel, comprising the following steps:

[0023] (1) Fix the position of the precast concrete lower column and align the precast concrete upper column with the precast concrete lower column so that the upper angle steel connector and the lower angle steel connector are perfectly aligned and connected;

[0024] (2) The precast concrete left beam and the precast concrete right beam are hoisted to the beam-column junction respectively. The longitudinal reinforcement of the beams at the bottom of the precast concrete left beam and the precast concrete right beam pass through the angle steel connector and overlap the core area of the node. At this time, the node assembly is completed;

[0025] (3) tying the longitudinal reinforcement of the beam at the top so that it passes through the core area of the node; pouring concrete into the core area of the node and the top of the precast concrete layer to form a cast-in-place concrete layer, wherein the cast-in-place concrete layer includes a cast-in-place superimposed layer;

[0026] (4) Grouting is performed on the gaps at the joint surfaces of the precast concrete upper column, the precast concrete lower column, the precast concrete left beam, and the precast concrete right beam to form the precast assembled beam-column node structure using vertical angle steel.

[0027] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0028] The present invention adopts a collaborative structure of precast beams and precast columns with post-casting gates, pre-buries vertical angle steel connectors at the ends of the precast columns, and realizes rapid assembly of upper and lower columns through transverse connecting plates and high-strength bolts; uses adjustable plates to connect the angle steels transversely to form an integral connection system with composite shear resistance; and can reserve a beam through-channel by adjusting the installation position and height of the transverse connecting plates, so that the beam structure can pass through the connection node area without obstacles. The longitudinal reinforcement at the bottom of the precast beam is mechanically anchored with bolts, and the top is cast synchronously with the node core area through a cast-in-place superimposed layer to form a structure equivalent to cast-in-place, which significantly improves the integrity and shear bearing capacity of the beam-column node. In addition, through the double-sided welding of the angle steel and the column longitudinal reinforcement and the optimization of the anchoring structure at the bottom of the beam, the internal force of the node can be efficiently transmitted. Compared with the traditional sleeve grouting process, the present invention greatly reduces the amount of wet work on site and shortens the construction period. The concrete in the core area of the node is cast in place to ensure density, meet the ductility requirements of the seismic code, and has the advantages of high assembly precision, reliable connection and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a prefabricated assembled beam-column node structure using vertical angle steels provided in an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the angle steel connector in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the structure of a precast concrete column in an embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the structure of a precast concrete beam in an embodiment of the present invention;

[0033] Figure 5 3D schematic diagram of the beams and columns after final assembly in an embodiment of the present invention.

[0034] In the figure: 1-precast upper column; 2-precast lower column; 3-precast left beam; 4-precast right beam; 5-angle steel connector; 5a-upper angle steel connector; 5b-lower angle steel connector; 6-post-gate; 7-angle steel; 8-transverse connecting plate; 9-high-strength bolts; 10-column longitudinal reinforcement; 11-column transverse stirrups; 12-precast beam bottom longitudinal reinforcement; 13-anchor end; 14-longitudinal reinforcement in composite beam; 15-beam transverse stirrups; 16-cast-in-place concrete layer. DETAILED DESCRIPTION

[0035] To further understand the scope of the present invention, the present invention is described in detail with reference to the accompanying drawings and examples. It should be understood that the embodiments described herein represent only some, and not all, embodiments of the present invention. The present invention may be implemented in a variety of different ways, as defined and covered by the claims. All other embodiments devised by relevant personnel in the art without inventive effort are intended to fall within the scope of protection of the present invention.

[0036] like Figures 1 to 5 As shown, an embodiment of the present invention provides a prefabricated assembled beam-column node structure using vertical angle steel, including a prefabricated concrete upper column 1, a prefabricated concrete lower column 2, a prefabricated concrete left beam 3, a prefabricated concrete right beam 4 and an angle steel connector 5.

[0037] The angle steel connector 5 includes an upper angle steel connector 5a and a lower angle steel connector 5b. The upper angle steel connector 5a is connected to the precast concrete upper column 1, and the angle steel connector 5a is partially embedded in the bottom of the precast concrete upper column 1. The lower angle steel connector 5b is connected to the precast concrete lower column 2, and the angle steel connector 5b is partially embedded and inserted into the top of the precast concrete lower column 2.

[0038] The upper angle steel connector 5a includes four angle steels 7, multiple transverse connecting plates 8, and multiple high-strength bolts. The four angle steels 7 are connected to the transverse connecting plates 8 via high-strength bolts 9. A portion of the upper angle steel connector 5a is pre-embedded in the bottom of the precast concrete upper column 1. The position of the transverse connecting plates 8 is adjustable.

[0039] A small portion of the lower angle steel connector 5b is inserted into the precast concrete lower column 2, and the remaining protruding portion is connected to the upper angle steel connector 5a through butt welds.

[0040] In one embodiment of the present invention, the angle steel 7 exposed on the precast concrete upper column 1 and the precast concrete lower part is assembled with the transverse connecting plate 8 and high-strength bolts to form a closed box-type skeleton; concrete is cast in place in the enclosed space of this closed box-type skeleton, and cooperates with the longitudinal reinforcement (mechanically anchored at the bottom and passed through at the top) extending into the precast beams (including the precast concrete left beam 3 and the precast concrete right beam 4) and the cast-in-place superimposed layers, ultimately forming a core stress-bearing area (node core area) that has both shear bearing resistance and overall concrete force transmission.

[0041] In one embodiment of the present invention, the lower end of the precast concrete upper column 1 is equipped with a post-casting port 6 that connects to the core area of the joint. The cross-sectional dimensions of the post-casting port 6 meet the concrete fluidity requirements of the core area of the joint and cover all connector welding areas. After the precast beams and columns are assembled and positioned, the concrete of the core area of the joint and the cast-in-place superimposed layer are continuously poured through the post-casting port to form the integral load-bearing structure.

[0042] In one embodiment of the present invention, the precast concrete upper column 1 and the precast concrete lower column 3 both include precast concrete and column longitudinal reinforcement 10 and column transverse stirrups 11 arranged in the precast concrete. The column longitudinal reinforcement 10 in the precast concrete upper column 1 extends out of the upper angle steel connector 5a by 100 to 200 mm and is welded to the inner side of the upper angle steel connector 5a through a double-sided fillet weld. The column longitudinal reinforcement 10 in the precast concrete lower column 3 is welded to the node domain angle steel.

[0043] In one embodiment of the present invention, the precast concrete left beam 3 and the precast concrete right beam 4 both include a precast concrete layer, a beam longitudinal steel bar, a beam transverse stirrup 15 and a cast-in-place composite layer. One end of the beam longitudinal steel bar (defined as the precast beam bottom longitudinal steel bar 12) at the bottom of the precast concrete left beam 3 and the precast concrete right beam 4 is overlapped in the node core area through an anchor end 13, and the outer surface of the anchor end 13 forms a mechanical bite connection with the post-cast concrete in the node core area. The beam longitudinal steel bar (defined as the longitudinal steel bar 14 in the composite beam) at the top of the beam is arranged in the cast-in-place composite layer, and the longitudinal steel bars 14 in the composite beams at the top of the left and right beams pass through the node core area.

[0044] In one embodiment of the present invention, the distance between adjacent anchoring ends 13 is ≥50 mm.

[0045] In one embodiment of the present invention, the factory prefabrication process of the prefabricated assembled beam-column joint structure using vertical angle steel is as follows:

[0046] The upper angle steel connector 5a is made of four angle steels 7 connected to a transverse connecting plate 8 via high-strength bolts 9, and is pre-buried 100mm to 200mm deep into the precast concrete upper column 1, extending 30mm to 60mm from the bottom of the precast concrete upper column 1. The longitudinal reinforcement at the corners of the precast concrete upper column 1 is welded to the inner side of the upper angle steel connector 5a via double-sided fillet welds, and the longitudinal reinforcement at the corners extends 100mm to 200mm beyond the upper angle steel connector 5a. After the reinforcement is tied, concrete is poured, and a post-casting gate 6 is reserved at the bottom of the precast concrete upper column 1. The production of the precast concrete lower column 2 is similar to that of the precast concrete upper column 1, except that the longitudinal reinforcement 10 in the precast concrete lower column 2 is directly welded to the node domain angle steel. The precast beams (including the precast concrete left beam 3 and precast concrete right beam 4) are first manufactured by tying the longitudinal reinforcement 12 at the bottom of the beams with the transverse stirrups 15. A section of anchoring steel extends from the bottom reinforcement of the precast concrete left beam 3 and precast concrete right beam 4 to facilitate subsequent assembly. After the reinforcement is tied and welded, the precast concrete left beam 3 and precast concrete right beam 4 are cast and cured in formwork along with the precast concrete upper column 1 and precast concrete lower column 2, respectively. Assembly is then performed when the concrete reaches its designed strength.

[0047] In one embodiment of the present invention, holes are opened on the angle steel 7 and the transverse connecting plate 8 at the bolt hole positions, and the size of the holes is the same as the inner diameter of the bolt hole.

[0048] In one embodiment of the present invention, the transverse connecting plate 8 is made of steel. The angle steel 7 and transverse connecting plate 8 are first cut and drilled in the factory, and then the steel is rust-proofed. They are connected to the transverse connecting plate 8 as a whole using high-strength bolts 9. After passing inspection, a portion of each is pre-embedded in the precast concrete upper column 1 and precast concrete lower column 2 as needed. After prefabrication in the factory, the precast concrete upper column 1, precast concrete lower column 2, precast concrete left beam 3, and precast concrete right beam 4 are cured according to standards and transported to the construction site until they reach strength standards.

[0049] The construction method of a prefabricated assembled beam-column node structure using vertical angle steel according to an embodiment of the present invention comprises the following steps:

[0050] Step 1: Fix the position of the precast concrete lower column 2, align the precast concrete upper column 1 with the precast concrete lower column 2, and fix it so that the upper angle steel connector 5a and the lower angle steel connector 5b are perfectly aligned. Then, weld the upper angle steel connector 5a and the lower angle steel connector 5b using a butt weld.

[0051] Step 2: Hoist the precast concrete left beam 3 and the precast concrete right beam 4 to the beam-column junction respectively. The longitudinal reinforcement of the precast concrete left beam 3 and the precast concrete right beam 4 passes through the angle steel connector and is overlapped in the core area of the node through the anchor end 13 of the steel bar. At this time, the node assembly is completed.

[0052] Step 3: After assembly, tie the longitudinal reinforcement 14 at the top of the beam so that it runs through the core area of the joint. After supporting the formwork, pour the joint core area and the beam overlap layer concrete through the post-casting 6 reserved at the bottom of the precast concrete column 1 to form a cast-in-place concrete layer 16.

[0053] Step 4: Grouting the gaps at the joint surfaces of the precast concrete upper column 1, the precast concrete lower column 2, the precast concrete left beam 3, and the precast concrete right beam 4.

[0054] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A prefabricated assembled beam-column node structure using vertical angle steel, characterized in that: It includes precast concrete upper columns, precast concrete lower columns, precast concrete left beams, precast concrete right beams and angle steel connectors; The precast concrete upper column and the precast concrete lower column are connected by angle steel connectors, which include an upper angle steel connector and a lower angle steel connector. One end of the upper angle steel connector and the lower angle steel connector are respectively embedded in the precast concrete upper column and the precast concrete lower column, and the other ends are connected to each other at the core area of the node. One ends of the precast concrete left beam and the precast concrete right beam are connected to each other in the core area of the node, both of which include a precast concrete layer and a cast-in-place superimposed layer, and cast-in-place concrete is arranged in the core area of the node.

2. A prefabricated assembled beam-column node structure using vertical angle steel according to claim 1, characterized in that: The precast concrete upper column is provided with a post pouring port connected to the core area of the node.

3. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 2, characterized in that: The cross-sectional dimensions of the post-casting gate meet the concrete fluidity requirements of the core area of the node and cover the entire welding area of the angle steel connector.

4. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 1, characterized in that: The precast concrete left beam and the precast concrete right beam also include longitudinal beam reinforcement and transverse beam stirrups. One end of the longitudinal beam reinforcement located at the bottom of the precast concrete left beam and the precast concrete right beam is overlapped through an anchor end in the core area of the node, and the outer surface of the anchor end forms a mechanical bite connection with the post-cast concrete in the core area of the node.

5. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 4, characterized in that: The cast-in-situ superimposed layer is located on the top of the precast concrete layer, and the cast-in-situ superimposed layer covers the longitudinal reinforcement of the beams at the top in the precast concrete left beam and the precast concrete right beam, and the transverse stirrups of the beams extending out of the precast concrete layer.

6. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 1, characterized in that: The upper angle steel connector and the lower angle steel connector both include a plurality of angle steels and a transverse connecting plate. The plurality of angle steels are connected by the transverse connecting plate to form a box-type frame structure.

7. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 1, characterized in that: The embedded depth of the upper and lower angle steel connectors in the precast concrete upper column and the precast concrete lower column is 100 to 200 mm, the length of the upper angle steel connector extending from the precast concrete upper column is 30 to 60 mm, and the length of the lower angle steel connector extending from the precast concrete lower column is 400 to 600 mm. The protruding part serves as the node domain angle steel.

8. A prefabricated assembled beam-column node structure using vertical angle steel according to any one of claims 1 to 7, characterized in that: The precast concrete upper column and the precast concrete lower column both include column longitudinal reinforcement, column transverse stirrups and precast concrete, and the column longitudinal reinforcement is connected with angle steel connectors.

9. The prefabricated assembled beam-column node structure using vertical angle steel according to claim 8, characterized in that: The longitudinal reinforcement of the column in the precast concrete upper column is connected to the inner side of the upper angle steel connector and extends 100 to 200 mm from the upper angle steel connector. The longitudinal reinforcement of the column in the precast concrete lower column is connected to the angle steel connector located in the core area of the node.

10. A construction method of a prefabricated assembled beam-column node structure using vertical angle steel according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Fix the position of the precast concrete lower column and align the precast concrete upper column with the precast concrete lower column so that the upper angle steel connector and the lower angle steel connector are perfectly aligned and connected; (2) The precast concrete left beam and the precast concrete right beam are hoisted to the beam-column junction respectively. The longitudinal reinforcement of the beams at the bottom of the precast concrete left beam and the precast concrete right beam pass through the angle steel connector and overlap the core area of the node. At this time, the node assembly is completed; (3) tying the longitudinal reinforcement of the beam at the top so that it passes through the core area of the node; pouring concrete into the core area of the node and the top of the precast concrete layer to form a cast-in-place concrete layer, wherein the cast-in-place concrete layer includes a cast-in-place superimposed layer; (4) Grouting is performed on the gaps at the joint surfaces of the precast concrete upper column, the precast concrete lower column, the precast concrete left beam, and the precast concrete right beam to form the precast assembled beam-column node structure using vertical angle steel.

Images