Full-assembly type post-pouring-free PEC beam column connecting joint

Abstract

The invention relates to a full-assembly type post-pouring-free PEC beam column connecting joint which comprises a prefabricated PEC column, a prefabricated PEC cross beam and a prefabricated PEC longitudinal beam, the prefabricated PEC column comprises H-shaped steel and concrete, and column connecting pieces are fixed to the periphery of the H-shaped steel; beam end plates are arranged at the ends, facing the prefabricated PEC columns, of the prefabricated PEC cross beams and the prefabricated PEC longitudinal beams, beam connecting pieces are connected to the beam end plates, the beam connecting pieces and the column connecting pieces are in butt joint and fixed, the beam connecting pieces and the column connecting pieces are jointly wrapped with channel steel, and gaps in the channel steel are filled with heat preservation and sound insulation materials. The construction method has the beneficial effects that the connection strength and rigidity are guaranteed, the transportation difficulty is reduced, the self weight of the structure is reduced, the transportation cost is reduced, the use of formworks is reduced, and the construction period is shortened; the welding quality problem of field welding connection is avoided, the bearing capacity of the structure is improved, construction is convenient and fast, reliability is good, corrosion resistance is excellent, and the heat preservation and sound insulation effects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated building engineering, and in particular relates to a fully prefabricated post-casting-free PEC beam-column connection node. Background Art

[0002] In recent years, in order to deeply implement the green ecological construction policy, lead the construction field to adopt a new low-carbon and environmentally friendly construction path, and ensure the long-term and stable development of the construction industry, the prefabricated and assembled construction model has been strongly praised.

[0003] PEC structure is a partially encapsulated steel-concrete composite structure, which is a composite structure formed by tying steel bars between the flanges of H-shaped steel and pouring concrete. PEC structure has the advantages of high bearing capacity, good seismic performance and fire and corrosion resistance, fast construction speed and green environmental protection. It is widely used in high-rise buildings, large-span structures and engineering reinforcement.

[0004] However, common PEC structures usually require steel bars to be tied at the beam-column joints before the formwork is set up to cast concrete. This involves wet work and is prone to causing pollution and damage to the on-site environment. In addition, the later pouring of concrete increases the complexity of construction, the difficulty of quality control of the project, and also causes an extension of the construction period. Moreover, the recycling rate of the formwork removed after the concrete reaches a certain strength is not high, which easily forms construction waste and does not conform to the development concept of green environmental protection. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fully assembled post-casting-free PEC beam-column connection node.

[0006] This fully assembled post-cast-free PEC beam-column connection node includes a prefabricated PEC column, a prefabricated PEC cross beam and a prefabricated PEC longitudinal beam. The prefabricated PEC column includes an H-shaped steel and concrete. Column connectors are fixed around the H-shaped steel. The prefabricated PEC cross beam and the prefabricated PEC longitudinal beam are provided with beam end plates at the ends facing the prefabricated PEC column. The beam end plates are connected with beam connectors. The beam connectors and the column connectors are butt-jointed and fixed. The beam connectors and the column connectors are wrapped with channel steel on the outside. The gaps in the channel steel are filled with thermal insulation and sound insulation materials.

[0007] Preferably, the beam connector and the column connector are both H-shaped steels, and the ends of the beam connector and the column connector are complementary inclined surfaces, wherein the column connector is shorter at the top and longer at the bottom, and the beam connector is longer at the top and shorter at the bottom; web connecting plates are respectively provided on both sides of the web of the beam connector and the column connector, and the web connecting plates are fixed through high-strength bolts.

[0008] Preferably, two channel steels are symmetrically mounted on the outside of the beam connector and the column connector, the channel steel flanges fit the outer sides of the flanges of the beam connector and the column connector, a flange connecting plate is provided on the outer sides of the channel steel flanges, and the flange connecting plates, channel steels, beam connectors and column connectors are fixed by passing through single-sided bolts.

[0009] Preferably, the column connector includes a column strong axis connector and a column weak axis connector, the column strong axis connector is fixedly connected to the flange of the H-shaped steel, and the column weak axis connector is connected to the web of the H-shaped steel; the prefabricated PEC cross beam is connected to the column strong axis connector, and the prefabricated PEC longitudinal beam is connected to the column weak axis connector.

[0010] Preferably, the prefabricated PEC columns, prefabricated PEC cross beams and prefabricated PEC longitudinal beams are all provided with steel bars in the reverse direction along the length; the steel bars in the prefabricated PEC columns are interrupted at the column connectors and provided with column longitudinal reinforcement bending sections, and the column longitudinal reinforcement bending sections are welded and fixed to the column connectors; the steel bars in the prefabricated PEC cross beams and prefabricated PEC longitudinal beams are provided with beam longitudinal reinforcement bending sections at the ends, and the beam longitudinal reinforcement bending sections are welded and fixed to the beam end plates.

[0011] The assembly method of the fully assembled post-cast-free PEC beam-column connection node comprises the following steps:

[0012] S1. Weld column connectors around the H-shaped steel of the prefabricated PEC column; weld beam end plates at the end of one side of the H-shaped steel of the prefabricated PEC cross beam and prefabricated PEC longitudinal beam, and weld beam connectors on the outside of the beam end plates;

[0013] S2, tying the steel bars of prefabricated PEC columns, prefabricated PEC beams and prefabricated PEC longitudinal beams;

[0014] S3, pouring concrete of precast PEC columns, precast PEC beams and precast PEC longitudinal beams respectively and curing them;

[0015] S4. Fix the beam connectors and column connectors together, and install thermal insulation materials and channel steel to wrap them.

[0016] Preferably, in step S2, the ends of the longitudinal bars in the prefabricated PEC column reinforcement are bent to form column longitudinal reinforcement bent sections, which are welded to the flanges of the column connectors; the ends of the longitudinal bars in the prefabricated PEC cross beams and prefabricated PEC longitudinal beam reinforcements are bent to form beam longitudinal reinforcement bent sections, which are welded to the inner sides of the beam end plates.

[0017] The beneficial effects of the present invention are:

[0018] 1) In the present invention, the webs of the beam connector and the column connector are inclined at a certain angle to be trapezoidal, and the upper and lower flanges are of unequal lengths. Compared with the traditional right-angled rectangular connector, while ensuring the connection strength, stiffness and other conditions, it saves more materials and is easier to connect, realizing the fully assembled connection of the beam and column components of the PEC system, which can be disassembled and transported independently, reducing the difficulty of transportation and reducing transportation costs. After the PEC components are prefabricated in the factory, they can be directly assembled on site, which is easy to install and reduces the construction period.

[0019] 2) The present invention adopts a dry connection construction method to avoid wet operations, reduce construction difficulty, and ensure construction quality; at the same time, no construction waste will be generated due to the removal of the formwork during the on-site assembly process, which is in line with the green and environmentally friendly assembly concept; high-strength bolts and single-sided bolts are used for connection through connecting plates on site, avoiding the welding quality problems of on-site welding connections, and has the advantages of improving structural bearing capacity, convenient construction, good reliability, and excellent corrosion resistance.

[0020] 3) The present invention arranges channel steel on the outside of the beam-column connection node, which avoids the post-casting strip and makes the appearance more beautiful and convenient for later decoration. The gap between the channel steel and the web of the connection node is filled with thermal insulation and sound insulation material, which plays a good role in thermal insulation and sound insulation.

[0021] 4) The column weak axis connector of the present invention is arranged between the inner flange and the web of the column H-shaped steel. On the one hand, it replaces this part of the reinforced concrete and reduces the dead weight of the structure under the premise of ensuring the strength and rigidity of the structure. On the other hand, the upper and lower flanges of the column weak axis connector can be used as templates when pouring concrete, reducing the use of templates and reducing costs. The connectors and channel steels at the connection between beams and columns are thickened to ensure the strength at the node, meeting the design requirements of a "strong node".

[0022] 5) The ends of the prefabricated PEC cross beam and the prefabricated PEC longitudinal beam of the present invention are provided with beam end plates for connecting the beam connectors. The beam end plates can also serve as templates for pouring concrete of the prefabricated PEC cross beam and the prefabricated PEC longitudinal beam, thereby reducing the use of templates and lowering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the fully assembled post-cast-free PEC beam-column connection node structure;

[0024] Figure 2 This is a disassembly diagram of the fully assembled post-cast-free PEC beam-column connection node;

[0025] Figure 3 It is a schematic diagram of the structure of the prefabricated PEC column;

[0026] Figure 4 It is a schematic diagram of the prefabricated PEC beam structure with end plates;

[0027] Figure 5 It is a schematic diagram of the prefabricated PEC longitudinal beam structure with end plates;

[0028] Figure 6 This is a schematic diagram of the disassembly of the connection between the column strong axis and the beam;

[0029] Figure 7 This is a disassembly diagram of the connection between the column weak axis and the longitudinal beam;

[0030] Figure 8 Schematic diagram of the connection between the column bent longitudinal reinforcement and the column weak axis connector;

[0031] Fig. 9 Schematic diagram of the connection between the bent section of the beam longitudinal reinforcement and the beam end plate.

[0032] Explanation of the accompanying drawings: prefabricated PEC column 1, prefabricated PEC cross beam 2, prefabricated PEC longitudinal beam 3, single-sided bolt 4, steel bar 5, H-shaped steel 6, concrete 7, high-strength bolt 8, column strong axis connector 9, column weak axis connector 10, beam connector 11, bolt hole 13, thermal insulation and sound insulation material 15, web connecting plate 16, channel steel 17, flange connecting plate 18, beam end plate 22, column longitudinal reinforcement bending section 24, beam longitudinal reinforcement bending section 25. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0034] Embodiment 1

[0035] As an example, Figures 1 to 9 As shown, this fully assembled post-cast-free PEC beam-column connection node includes a prefabricated PEC column 1, a prefabricated PEC cross beam 2 and a prefabricated PEC longitudinal beam 3. The prefabricated PEC column 1 includes an H-shaped steel 6 and concrete 7. The H-shaped steel 6 is fixed with column connectors around it.

[0036] Specifically, Figures 1 to 5 As shown, the column connector includes a column strong axis connector 9 and a column weak axis connector 10. The column strong axis connector 9 is welded to the outer flange of the prefabricated PEC column 1H-shaped steel 6, and is symmetrically arranged with the strong axis of the prefabricated PEC column 1 as the symmetry axis; the column weak axis connector 10 is welded between the inner flange and the web of the prefabricated PEC column 1H-shaped steel 6, and is symmetrically arranged with the weak axis of the prefabricated PEC column 1 as the symmetry axis; the prefabricated PEC cross beam 2 is connected to the column strong axis connector 9, and the prefabricated PEC longitudinal beam 3 is connected to the column weak axis connector 10.

[0037] The ends of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3 facing the prefabricated PEC column 1 are provided with beam end plates 22, and the beam end plates 22 are connected with beam connectors 11, and the beam connectors 11 and the column connectors are butt-jointed and fixed, and the flanges, webs and thicknesses of the column strong axis connectors 9 and the column weak axis connectors 10 are respectively greater than the flange and web thicknesses of the prefabricated PEC column 1; the flange and web thicknesses of the beam connectors 11 are respectively greater than the flange and web thicknesses of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3; the flange and web thicknesses of the column strong axis connectors 9 and the column weak axis connectors 10 are respectively equal to the flange and web thicknesses of the beam connectors 11.

[0038] The bending stiffness of the beam connector 11 should be greater than the bending stiffness of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3; the bending bearing capacity of the beam connector 11 is greater than the bending bearing capacity of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3.

[0039] The beam connector 11 and the column connector are wrapped with a channel steel 17. The bending stiffness of the channel steel 17 is not less than the bending stiffness of the beam connector 11; the bending bearing capacity of the channel steel 17 is not less than the bending bearing capacity of the beam connector 11.

[0040] The prefabricated PEC column 1, the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3 are all provided with steel bars 5 in the reverse direction along the length; the steel bars 5 in the prefabricated PEC column 1 are interrupted at the column connecting piece and provided with a column longitudinal reinforcement bending section 24, and the column longitudinal reinforcement bending section 24 is welded and fixed to the column connecting piece; the ends of the steel bars 5 in the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3 are provided with a beam longitudinal reinforcement bending section 25, and the beam longitudinal reinforcement bending section 25 is welded and fixed to the beam end plate 22.

[0041] Embodiment 2

[0042] As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific fully assembled PEC beam-column connection node without post-casting:

[0043] The beam connector 11 and the column connector are both H-shaped steel 6, and the ends of the beam connector 11 and the column connector are complementary inclined surfaces, that is, the web shape is trapezoidal, and the end surface is inclined at a certain angle. Figure 6 and Figure 7 As shown, the column connector is shorter at the top and longer at the bottom, while the beam connector 11 is longer at the top and shorter at the bottom, and they have the same inclination angle; web connecting plates 16 are respectively provided on both sides of the webs of the beam connector 11 and the column connector, and the two web connecting plates 16 are clamped on both sides of the webs of the beam connector 11 and the column connector, and are fixed through high-strength bolts 8, thereby splicing the beam connector 11 and the column connector together.

[0044] Two channel steels 17 are symmetrically sleeved on the outside of the beam connector 11 and the column connector, and the flanges of the channel steel 17 fit the outer sides of the flanges of the beam connector 11 and the column connector. A flange connecting plate 18 is provided on the outer sides of the flanges of the channel steel 17. The flange connecting plate 18, the channel steel 17, the beam connector 11 and the flanges of the column connector are penetrated and fixed by high-strength bolts 8.

[0045] The flange thickness of the channel steel 17 is not less than the flange thickness of the prefabricated PEC column 1 and the flange thickness of the beam connector 11. The web thickness of the channel steel 17 is not less than the web thickness of the prefabricated PEC column 1 and the web thickness of the beam connector 11. The strength of the beam end plate 22 of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3 is greater than the strength of the flange and web of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3. The end plate thickness of the beam end plate 22 is greater than the flange and web thickness of the H-shaped steel 6 of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3.

[0046] The gap between the web connecting plate 16 and the channel steel 17 is filled with thermal insulation and sound insulation material 15 .

[0047] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0048] Embodiment 3

[0049] As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, an assembly method of this fully assembled post-cast-free PEC beam-column connection node:

[0050] S1. According to the drawings, weld the column strong axis connector 9 on the outer flange of the prefabricated PEC column 1H steel 6, weld the column weak axis connector 10 between the inner flange and the web, and reserve bolt holes 13 on the flanges and webs of the column strong axis connector 9 and the column weak axis connector 10; Figure 3 As shown, in this embodiment, there are 4 bolt holes 13 on the flange, 8 bolt holes 13 on the lower flange of the connector, and 6 bolt holes 13 on the trapezoidal web. Beam end plates 22 are welded at one end of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3 H-shaped steel 6, and beam connectors 11 are welded on the outside of the beam end plates 22, and bolt holes 13 are reserved on the flange and web of the beam connector 11.

[0051] S2, tie the steel bars 5, bend the ends of the longitudinal bars of the prefabricated PEC column 1, and weld the bent section 24 of the column longitudinal bars to the outer flange of the column weak axis connector 10; bend the ends of the longitudinal bars of the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3, and weld the bent section 25 of the beam longitudinal bars to the inner side of the beam end plate 22. Leave a certain distance between the bent longitudinal bars.

[0052] S3. Concrete 7 is provided between the two inner flanges and webs of the H-shaped steel 6 of the prefabricated PEC column 1, the prefabricated PEC cross beam 2 and the prefabricated PEC longitudinal beam 3, and the steel bars 5 are wrapped in the concrete 7 and maintained.

[0053] S4, transport the prefabricated PEC column 1, prefabricated PEC cross beam 2 and prefabricated PEC longitudinal beam 3 to the construction site, use high-strength bolts 8 to connect through the web connection plate 16; use single-sided bolts 4 to connect through the channel steel 17 and the flange connection plate 18, and assemble on site, wherein the flange connection plate 18 can be selected according to the actual situation of the project. After aligning the inclined section of the trapezoidal web of the beam connector 11 with the inclined section of the trapezoidal web of the column strong axis connector 9, use high-strength bolts 8 to connect through the bolt hole 13 through the web connection plate 16, fill the outer side of the web connection plate 16 with thermal insulation and sound insulation materials to fill the gaps between the flanges and webs of the beam and column connectors, and then use single-sided bolts 4 to connect through the bolt hole 13 through the flange connection plate 18 and the channel steel 17.

[0054] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A fully assembled PEC beam-column connection node without post-casting, characterized in that: The invention comprises a prefabricated PEC column (1), a prefabricated PEC cross beam (2) and a prefabricated PEC longitudinal beam (3). The prefabricated PEC column (1) comprises an H-shaped steel (6) and concrete (7). Column connectors are fixed around the H-shaped steel (6). The prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3) are provided with beam end plates (22) at the ends facing the prefabricated PEC column (1). The beam end plates (22) are connected with beam connectors (11). The beam connectors (11) and the column connectors are butt-jointed and fixed. The beam connectors (11) and the column connectors are wrapped with channel steel (17) on the outside. The gaps in the channel steel (17) are filled with thermal insulation and sound insulation materials (15).

2. The fully assembled post-cast-free PEC beam-column connection node according to claim 1 is characterized in that: The beam connector (11) and the column connector are both H-shaped steel (6), and the ends of the beam connector (11) and the column connector are complementary inclined surfaces, wherein the column connector is shorter at the top and longer at the bottom, and the beam connector (11) is longer at the top and shorter at the bottom; web connecting plates (16) are respectively provided on both sides of the webs of the beam connector (11) and the column connector, and the web connecting plates (16) are penetrated and fixed by high-strength bolts (8).

3. The fully assembled post-cast-free PEC beam-column connection node according to claim 2 is characterized in that: Two channel steels (17) are symmetrically sleeved on the outside of the beam connector (11) and the column connector. The flanges of the channel steels (17) fit the outer sides of the flanges of the beam connector (11) and the column connector. A flange connecting plate (18) is provided on the outer sides of the flanges of the channel steels (17). The flange connecting plate (18), the channel steels (17), the beam connector (11) and the flanges of the column connector are penetrated and fixed by single-sided bolts (4).

4. The fully assembled post-cast-free PEC beam-column connection node according to claim 1 is characterized in that: The column connection member comprises a column strong axis connection member (9) and a column weak axis connection member (10); the column strong axis connection member (9) is fixedly connected to the flange of the H-shaped steel (6), and the column weak axis connection member (10) is connected to the web of the H-shaped steel (6); the prefabricated PEC cross beam (2) is connected to the column strong axis connection member (9), and the prefabricated PEC longitudinal beam (3) is connected to the column weak axis connection member (10).

5. The fully assembled post-cast-free PEC beam-column connection node according to claim 1 is characterized in that: The prefabricated PEC column (1), the prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3) are all provided with steel bars (5) in the reverse direction along the length; the steel bars (5) in the prefabricated PEC column (1) are interrupted at the column connecting piece and provided with a column longitudinal bar bending section (24), and the column longitudinal bar bending section (24) and the column connecting piece are welded and fixed; the ends of the steel bars (5) in the prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3) are provided with a beam longitudinal bar bending section (25), and the beam longitudinal bar bending section (25) and the beam end plate (22) are welded and fixed.

6. The method for assembling a fully assembled post-cast-free PEC beam-column connection node according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, welding column connectors around the H-shaped steel (6) of the prefabricated PEC column (1); welding a beam end plate (22) at one end of the H-shaped steel (6) of the prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3), and welding a beam connector (11) on the outside of the beam end plate (22); S2, tying the steel bars of the prefabricated PEC column (1), the prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3); S3, respectively pouring concrete (7) of the precast PEC column (1), the precast PEC cross beam (2) and the precast PEC longitudinal beam (3) and curing them; S4, butt-join and fix the beam connector (11) and the column connector, and install the thermal insulation and sound insulation material (15) and the channel steel (17) to wrap them.

7. The method for assembling a fully assembled post-cast-free PEC beam-column connection node according to claim 6, characterized in that: In step S2, the ends of the longitudinal bars in the steel bars (5) of the prefabricated PEC column (1) are bent to form a column longitudinal bar bent section (24), and the column longitudinal bar bent section (24) is welded to the flange of the column connector; the ends of the longitudinal bars in the steel bars (5) of the prefabricated PEC cross beam (2) and the prefabricated PEC longitudinal beam (3) are bent to form a beam longitudinal bar bent section (25), and the beam longitudinal bar bent section (25) is welded to the inner side of the beam end plate (22).

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