Novel replaceable and detachable assembly type beam-slab-column joint

Abstract

The invention relates to a novel replaceable and detachable assembly type beam-slab-column joint. The novel replaceable and detachable assembly type beam-slab-column joint is characterized by comprising a vertically-arranged prefabricated steel structure column and an I-shaped steel cantilever beam support fixedly connected with the side face of the prefabricated steel structure column; the H-shaped steel cantilever beam support and the section steel beam are arranged in an aligned mode, the butt joint portion of the H-shaped steel cantilever beam support and the section steel beam is connected and fixed through a replaceable component, a prefabricated concrete floor slab is laid on the H-shaped steel cantilever beam support and the section steel beam, and floor slab built-in bolts preset in the concrete floor slab are distributed on the lower surface of the concrete floor slab. The built-in bolts of the floor slab are in bolt connection with reserved bolt holes in the two sides of the upper flange of the section steel beam and the cantilever beam support, and the replaceable components comprise loss components and inter-beam connecting bolts. Wet operation of connecting parts can be replaced by dry operation, and a recoverable energy dissipation mechanism after the earthquake action is formed.

Description

Technical Field

[0001] The invention relates to the technical field of steel structures, and in particular to an assembled beam-slab-column node of a green cycle replaceable damaged component in the field of earthquake resistance and progressive collapse resistance. Background Art

[0003] The concepts of green energy conservation, environmental protection and low-carbon circulation have been deeply integrated into the development of the construction industry. Many new structural forms and construction methods have been proposed in the research on earthquake resistance and progressive collapse resistance. Among them, the replacement of damaged components provides a practical and effective new path for earthquake resistance and collapse resistance research, and the structural recovery function formed by new nodes realizes the full life cycle of the building structure. In addition, prefabricated steel structure buildings are naturally detachable structures. When the floor slabs are detachably connected, the entire structural system can be recycled.

[0004] Prefabricated building structures have become a key development direction in the field of green buildings and building industrialization because of their advantages in reducing construction waste and construction dust pollution, shortening construction period, improving production efficiency, improving project quality, digesting excess steel production capacity, and forming strategic steel reserves. However, the beam-column nodes and connection parts in prefabricated frame structures are weak links in seismic resistance and are prone to structural damage. In order to improve the shortcomings of prefabricated frame structures, domestic and foreign scholars have made a series of improvements and innovations to the beam-column nodes and connection nodes of prefabricated frame structures, and have conducted a large number of theoretical and experimental studies on the improved connection forms. The current development trend of prefabricated buildings focuses on high precision, standardization, normalization and integration of products. The core of the construction technology of prefabricated structures is to replace traditional wet operations with convenient and efficient dry operations. However, in the existing construction of prefabricated composite structures, there are still many critical wet operations in the node connection parts. The construction of the node area is crucial to the engineering quality and performance of the structure.

[0005] A large number of brittle fractures occurred at the welded connections of beams and columns during the use of building structures, which is contrary to the seismic design principles of "strong columns and weak beams" and "strong nodes and weak components". In the subsequent research on steel structure node connections, in order to achieve a ductile failure mode and avoid brittle fracture, the method used is mainly to transfer the plastic deformation area from the beam-column connection part that is prone to brittle fracture to the beam section at a certain distance from it, which can in turn guide the beam to produce plastic hinges and achieve the expected failure mode. Based on this idea, a beam-column node connection form with plastic hinges moved outward is realized.

[0006] Chinese patent CN 115030309 A "A concrete beam-column assembled node with cantilever beam section" provides a concrete beam-column assembled node with cantilever beam section, including two H-shaped steel beams respectively embedded in the cantilever beam end and the prefabricated beam end, which can quickly assemble the beam-column node into a whole; and transfer the plastic hinge from the core area of ​​the beam-column to the H-shaped steel beam, protecting the core area of ​​the beam-column node from damage and improving the seismic performance of the beam-column node.

[0007] Chinese patent CN 118855090 A "A replaceable assembled concrete dry-type connection beam-column node" realizes the sequential yielding of components by setting the relationship between the bearing capacity of energy-absorbing steel plates, connecting steel plates and angle steels, so that the stiffness of the beam-column node decreases slowly, and the bending moment when the energy-absorbing steel plates and connecting steel plates yield is less than the bending moment when the angle steel yields, thereby dissipating seismic energy; and the energy-absorbing steel plates, connecting steel plates, angle steels and the prestressing of the bolts can be increased.

[0008] The technical solution of the above patent optimizes the connection method of the prefabricated structure to a certain extent, and realizes the outward movement of the plastic hinge, forming a ductile failure mode and avoiding brittle fracture; but there are still some shortcomings.

[0009] For example, in the patent "A concrete beam-column assembled node with cantilever beam segments", although the plastic hinge can be transferred from the core area of ​​the beam-column to the H-shaped steel beam, the core area of ​​the beam-column node is protected from damage and the seismic performance of the beam-column node is improved. However, the shortcomings are: irreversible structural loss occurs after the node is damaged by energy consumption, and the structural recoverability is not considered; in addition, the node does not consider the floor slab participating in the node energy consumption study.

[0010] For example, in the patent "A replaceable assembled concrete dry-connected beam-column node", although the energy-absorbing steel plate is set to dissipate the seismic energy and the energy-absorbing steel plate can be replaced, the shortcomings are: the replacement of the energy-absorbing steel plate is relatively complicated; and the operability and recoverability of the structure after the floor slab participates in the energy dissipation of the beam-column node are not considered. Summary of the invention

[0012] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a new type of replaceable and detachable prefabricated beam-slab-column node, which is reasonably designed and can realize dry operation to replace wet operation of connection parts and form an energy consumption mechanism that can be recovered after earthquake action.

[0013] The technical solution of the present invention is as follows: A new type of replaceable and detachable assembled beam-slab-column node, characterized in that it comprises a vertically arranged prefabricated steel structure column and an I-shaped steel cantilever beam support fixedly connected to the side of the prefabricated steel structure column, the I-shaped steel cantilever beam support is aligned with the steel beam and is connected and fixed at the butt portion of the two by a replaceable component, a prefabricated concrete floor is laid above the I-shaped steel cantilever beam support and the steel beam, the lower surface of the concrete floor is provided with floor built-in bolts preset in the concrete floor, and the floor built-in bolts are arranged on the bottom surface of the concrete floor. The bolts are bolted to the reserved bolt holes on both sides of the cantilever beam support and the upper flange of the steel beam. The replaceable component includes a loss component and inter-beam connecting bolts. The loss component includes a bottom plate and a cover plate evenly provided with through holes. The bottom plate is arranged on the upper surface of the upper flange or the lower surface of the lower flange of the joint between the cantilever beam support and the steel beam, and the cover plate is correspondingly arranged on the lower surface of the upper flange or the upper surface of the lower flange of the joint between the steel cantilever beam support and the steel beam. The bottom plate and the cover plate are locked and fixed by inter-beam connecting bolts passing through the through holes and the through holes on the flanges.

[0014] Preferably, the above-mentioned concrete floor is provided with a floor reserved operation groove which is directly opposite to the replaceable component installed on the steel cantilever beam support and the upper flange of the steel beam, and a prefabricated cover plate is installed on the notch of the floor reserved operation groove.

[0015] Preferably, a pre-embedded connecting steel part is embedded in the groove of the reserved operating groove of the above-mentioned floor slab, and the pre-embedded connecting steel part is an annular steel plate. The central part of the pre-embedded connecting steel part has a through opening that matches the shape of the reserved operating groove of the floor slab, and the pre-embedded connecting steel part is provided with threaded holes for connecting with the prefabricated cover plate using bolts.

[0016] Preferably, the above-mentioned prefabricated cover plate includes a prefabricated channel steel shell, wing pieces arranged around the prefabricated channel steel shell and concrete filling blocks buried in the prefabricated channel steel shell, the outer peripheral shape and size of the prefabricated channel steel shell are consistent with the reserved operating groove of the floor slab, and the wing pieces are provided with channels for passing cover plate connecting bolts, and the cover plate connecting bolts are threadedly connected and fixed to the threaded holes.

[0017] Preferably, a pull ring for easy pulling is pre-embedded on the concrete filling block.

[0018] Preferably, the above-mentioned base plate and cover plate are both rectangular plates, the base plate and the cover plate have the same length and thickness, the width of the cover plate is less than half of the width of the base plate, and the side edge is provided with an inner recessed portion opposite to the joint of the cantilever beam supporting the steel beam to form a vulnerable portion in the inner recessed portion.

[0019] Preferably, the bolt head of the above-mentioned built-in bolt of the floor slab is embedded in the concrete floor slab, and two nuts are screwed on the screw part of the built-in bolt of the floor slab, one of the nuts is also embedded in the concrete floor slab, and the other nut is screwed on the lower part of the screw part passing through the reserved bolt hole.

[0020] Preferably, the prefabricated steel structure columns are various types of steel columns or steel-concrete columns.

[0021] Preferably, the I-shaped steel cantilever beam support is pre-welded and fixed to the prefabricated steel structure column.

[0022] Preferably, the inter-beam connecting bolts, floor slab built-in bolts, and cover plate connecting bolts are all high-strength bolts; and web connecting plates are provided at the webs of the cantilever beam support and the steel beam.

[0023] The construction method of the replaceable and detachable new assembled beam-slab-column node of the present invention comprises: prefabricating a concrete floor slab (including pre-embedding floor slab built-in bolts and pre-embedded connecting steel parts in the production of the concrete floor slab), prefabricating a cover plate (including embedding concrete filling blocks in a prefabricated channel steel shell), and pre-fixing a prefabricated steel structure column to a cantilever beam support; during installation and construction, the steel beam is flushly butted with the cantilever beam support, and a replaceable component is used to connect and fix the butt joint of the steel beam and the cantilever beam support (that is, the bottom plate is first arranged on the upper surface of the upper flange or the lower surface of the lower flange of the butt joint of the steel cantilever beam support and the steel beam). The cover plate is correspondingly arranged on the lower surface of the upper flange of the joint part between the steel cantilever beam support and the steel beam or the upper surface of the lower flange, and then the bottom plate and the cover plate are locked and fixed by the beam connecting bolts passing through the through holes and the through holes on the flanges, that is, the fixation of the joint part between the steel beam and the cantilever beam support is completed), and then the concrete floor slab is laid on the upper surface of the steel beam and the cantilever beam support. During the laying process, the built-in bolts of each floor slab are passed through the reserved bolt holes on both sides of the cantilever beam support and the upper flange of the steel beam, and the nuts are locked and fixed on the lower surface of the cantilever beam support and the upper flange of the steel beam; finally, the prefabricated cover plate is installed on the reserved operation groove of the floor slab.

[0024] The present invention is simple to manufacture, convenient to construct, and easy to disassemble and assemble. The replacement of damaged components is convenient and easy for daily maintenance. In terms of earthquake resistance and collapse resistance, it meets the design principle of strong columns and weak beams, and realizes the outward movement of plastic hinges through cantilever beam supports, thereby achieving a ductile failure mode and improving the earthquake resistance and collapse resistance of the node. The setting of the loss component in this node not only weakens the cross section of the beam, achieving the above purpose, and then causing the damage to occur in the replaceable component area; it can also be quickly and conveniently replaced after damage occurs in the node area, achieving the recoverability of the structural performance.

[0025] The present invention takes into account the operability and recoverability of the structure after the floor slab participates in the energy consumption of the beam-column node. By setting a prefabricated cover plate, the floor slab is not affected in the repair operation after the node is damaged. At the same time, the floor slab is detachably connected to the steel beam through built-in bolts to achieve the purpose of recycling. The beam-slab-column node of the present invention adopts a new assembled connection in terms of connection method. The efficient and convenient dry operation of the assembled connection greatly improves the construction efficiency and forms a recoverable energy consumption mechanism after an earthquake. The new node steel structure of the present invention has large consumables, low construction cost and is easy to obtain, which provides possibility for large-scale promotion of this node. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of the overall structure of a new type of replaceable and detachable assembled beam-slab-column node.

[0027] Figure 2 The present invention is a schematic diagram of the replacement operation of a new type of replaceable and detachable assembled beam-slab-column node component.

[0028] Figure 3 The present invention is a schematic diagram of the disassembly of a new type of replaceable and detachable assembled beam-slab-column node structure.

[0029] Figure 4 This is a detailed diagram of the node area decomposition of a new type of replaceable and detachable assembled beam-slab-column node loss component (dog bone type) of the present invention.

[0030] Figure 5 This is a detailed diagram of the disassembly of a new type of replaceable and detachable assembled beam-slab-column node concrete floor of the present invention.

[0031] Figure 6 It is a cross-sectional view of a new type of replaceable and detachable assembled beam-slab-column node of the present invention.

[0032] Figure 7 It is a front view of a new type of replaceable and detachable assembled beam-slab-column node of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0035] A new type of replaceable and detachable assembled beam-slab-column node. It includes a vertically arranged prefabricated steel structure column 1 and an I-shaped steel cantilever beam support 15 fixedly connected to the side of the prefabricated steel structure column 1. The cantilever beam support 15 is made of I-shaped steel (the I-shaped steel is made of Q235 steel). The cantilever beam support 15 and the prefabricated steel structure column 1 are welded or bolted. The prefabricated steel structure column 1 is various types of steel columns or steel concrete columns.

[0036] The I-beam cantilever beam support 15 is aligned with the steel beam 2 and connected and fixed at the butt portion thereof by a replaceable component 4. The I-beam cantilever beam support 15 is aligned with the steel beam 2, which means that both are made of I-beam and are aligned at the top, bottom, front and back.

[0037] A prefabricated concrete floor 3 is laid above the I-shaped steel cantilever beam support 15 and the steel beam 2. When the concrete floor 3 is made, the floor built-in bolts 10 and the pre-embedded connecting steel parts 6 are pre-buried. The floor built-in bolts 10 are bolted to the cantilever beam support 15 and the reserved bolt holes 21 on both sides of the upper flange of the steel beam 2 (that is, the floor built-in bolts 10 are passed through the reserved bolt holes 21 and then locked with nuts); a web connecting plate 22 is provided at the web of the cantilever beam support 15 and the steel beam 2. The web connecting plate 22 is a rectangular plate with through holes arranged thereon, and the webs of the cantilever beam support 15 and the steel beam 2 are correspondingly provided with through holes. The two web connecting plates 22 are flatly arranged on the two side surfaces of the webs of the cantilever beam support 15 and the steel beam 2, and bolts are inserted through their through holes for fixing, so as to achieve better fixation of the cantilever beam support 15 and the steel beam 2 (such as Figure 7 as shown).

[0038] The replaceable component 4 includes a loss component 8 and inter-beam connecting bolts 9. The loss component 8 includes a bottom plate 81 and a cover plate 82 evenly provided with through holes. The bottom plate 81 and the cover plate 82 are both rectangular plates. The bottom plate 81 and the cover plate 82 have the same length and thickness. The width of the cover plate 82 is less than half of the width of the bottom plate 81. An inner recess 85 opposite to the joint between the cantilever beam support 15 and the steel beam 2 can be provided on the side edges of the bottom plate 81 and the cover plate 82 to form a vulnerable part in the inner recess 85. The loss component 8 plays a role in weakening the beam cross section in the node. The inner recess 85 reduces the area of ​​the bottom plate 81 and the cover plate 82 in this area, ensuring that damage occurs on the loss component.

[0039] The bottom plate 81 is arranged on the upper surface of the upper flange or the lower surface of the lower flange of the joint between the cantilever beam support 15 and the steel beam 2, and the cover plate 82 is correspondingly arranged on the lower surface of the upper flange or the upper surface of the lower flange of the joint between the steel cantilever beam support 15 and the steel beam 2. The bottom plate 81 and the cover plate 82 are locked and fixed by the inter-beam connecting bolts 9 passing through the through holes 83 and the through holes 84 on the flanges.

[0040] In order to facilitate the replacement of the replaceable component 4 located on the upper surface of the upper flange of the joint between the cantilever beam support 15 and the steel beam 2, a floor reserved operation groove 5 is provided on the concrete floor 3, which is opposite to the replaceable component 4 installed on the upper flange of the steel cantilever beam support 15 and the steel beam 2. A prefabricated cover plate 7 is installed on the notch of the floor reserved operation groove 5. After the replaceable component 4 located on the upper surface of the upper flange of the joint between the cantilever beam support 15 and the steel beam 2 is installed and fixed, the concrete floor 3 is laid, and then the prefabricated cover plate 7 is covered on the concrete floor 3. Similarly, when the replaceable component 4 needs to be replaced, the prefabricated cover plate 7 is first removed, and then the replaceable component 4 can be replaced by removing the connecting bolts 9 between the beams.

[0041] An embedded connecting steel part 6 is embedded in the groove of the reserved operating groove 5 of the floor slab. The embedded connecting steel part 6 is an annular steel plate. The center of the embedded connecting steel part 6 has an opening that matches the shape of the reserved operating groove 5 of the floor slab. The embedded connecting steel part 6 is provided with threaded holes 61 for connecting to the prefabricated cover plate 7 with bolts.

[0042] The prefabricated cover plate 7 includes a prefabricated channel steel shell 11, wing pieces arranged around the prefabricated channel steel shell 11 and a concrete filling block 12 buried in the prefabricated channel steel shell 11. The prefabricated channel steel shell 11 is a rectangular channel shell, and its outer peripheral shape and size are consistent with the reserved operation through groove 5 of the floor slab. The wing pieces are provided with channels for passing cover plate connecting bolts 13, and the cover plate connecting bolts 13 are threadedly connected and fixed to the threaded holes 61. The prefabricated cover plate 7 and the concrete floor slab 3 can be disassembled and assembled by disassembling and assembling the cover plate connecting bolts 13 and the threaded holes 61.

[0043] A pull ring 14 for easy pulling is pre-buried on the concrete filling block 12 , and the pull ring 14 is used to facilitate pulling after the cover plate connecting bolts 13 and the threaded holes 61 are removed.

[0044] In order to ensure a reasonable design, the bolt head of the built-in bolt 10 of the floor slab is embedded in the concrete floor slab 3, and two nuts are screwed on the screw portion of the built-in bolt 10 of the floor slab, one of the nuts is also embedded in the concrete floor slab 3, and the other nut is screwed to the lower part of the screw portion passing through the reserved bolt hole 21. Through the above design, the connection between the built-in bolt 10 of the floor slab and the concrete floor slab 3 can be made more secure.

[0045] Among them, the inter-beam connecting bolts 9, the floor built-in bolts 10, and the cover plate connecting bolts 13 are all high-strength bolts; the floor built-in bolts 10 are built-in single-nut high-strength bolts, which are easy to disassemble and assemble, forming a detachable shear connector, meeting the shear stiffness and bearing capacity requirements, and realizing a stable connection between the floor and the steel beam.

[0046] The construction method of the replaceable and detachable novel assembled beam-slab-column node of the present invention comprises: prefabricating a concrete floor slab (including pre-embedding a floor slab built-in bolt 10 and pre-embedded connecting steel parts 6 in the process of making a concrete floor slab 3), prefabricating a cover plate (including embedding a concrete filling block 12 in a prefabricated channel steel shell 11), and pre-fixing a prefabricated steel structure column to a cantilever beam support 15; during installation and construction, the steel beam is connected flush with the cantilever beam support 15, and a replaceable component 4 is used to connect and fix the connecting portion between the steel beam and the cantilever beam support 15 (that is, the bottom plate 81 is first arranged on the upper surface of the upper flange or the lower surface of the lower flange of the connecting portion between the steel cantilever beam support 15 and the steel beam 2, and the cover plate 8 is fixed to the cantilever beam support 15; 2 is correspondingly arranged on the lower surface of the upper flange or the upper surface of the lower flange of the joint part between the steel cantilever beam support 15 and the steel beam 2, and then the bottom plate 81 and the cover plate 82 are locked and fixed by the beam connection bolts 9 passing through the through holes 83 and the through holes 84 on the flanges, that is, the fixation of the joint part between the steel beam and the cantilever beam support 15 is completed), and then the concrete floor is laid on the upper surface of the steel beam and the cantilever beam support 15. During the laying process, the built-in bolts 10 of each floor are passed through the cantilever beam support 15 and the reserved bolt holes 21 on both sides of the upper flange of the steel beam 2, and the nuts are locked and fixed on the lower surfaces of the cantilever beam support 15 and the upper flange of the steel beam 2; finally, the prefabricated cover plate 7 is installed on the reserved operation groove 5 of the floor.

[0047] 1. The invention is simple to manufacture and easy to construct, and the damaged components can be replaced easily, which is convenient for daily maintenance. 2. The present invention meets the design principle of strong columns and weak beams, realizes the outward movement of plastic hinges through cantilever beam supports, thereby achieving a ductile failure mode and improving the seismic and anti-collapse performance of the node.

[0048] 3. The provision of the consumable component of the present invention not only weakens the cross section of the beam, thus achieving the above-mentioned purpose, thereby causing the damage to occur in the replaceable component area; it also enables quick and convenient replacement after damage occurs in the node area, thereby achieving the recoverability of the structural performance.

[0049] 4. The beam-slab-column node of the present invention adopts a new type of assembled connection in terms of connection method. The efficient and convenient dry operation of the assembled type greatly improves the construction efficiency and forms an energy consumption mechanism that can be recovered after an earthquake.

[0050] 5. The present invention takes into account the operability and recoverability of the structure after the floor slab participates in the energy consumption of the beam-column node. By setting up a prefabricated cover plate, the floor slab is not affected in the repair operation after the node is damaged. At the same time, the floor slab is detachably connected to the steel beam through built-in bolts, which is easy to disassemble and assemble, and can achieve the purpose of recycling and reuse.

[0051] 6. The present invention has a simple structure, is easy to operate, uses environmentally friendly materials, and is easy to disassemble and recycle; and the steel structure consumes a lot of materials, has a low cost, is easy to obtain, and is suitable for large-scale promotion.

[0052] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, it does not require creative labor to design new types of replaceable and detachable prefabricated beam-slab-column nodes in different forms. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A new type of replaceable and detachable assembled beam-slab-column node, characterized in that: The invention comprises a prefabricated steel structure column (1) arranged vertically and an I-shaped steel cantilever beam support (15) fixedly connected to the side of the prefabricated steel structure column (1), wherein the I-shaped steel cantilever beam support (15) is arranged in alignment with the steel beam (2) and is connected and fixed at the butt joint between the two by a replaceable component (4), a prefabricated concrete floor slab (3) is laid above the I-shaped steel cantilever beam support (15) and the steel beam (2), the lower surface of the concrete floor slab (3) is provided with floor slab built-in bolts (10) preset in the concrete floor slab (3), and the floor slab built-in bolts (10) are connected to the cantilever beam support (15) and the reserved bolts on both sides of the upper flange of the steel beam (2). The replaceable component (4) comprises a loss component (8) and inter-beam connection bolts (9), the loss component (8) comprising a bottom plate (81) and a cover plate (82) uniformly provided with through holes, the bottom plate (81) being arranged on the upper surface of the upper flange or the lower surface of the lower flange of the butt joint between the cantilever beam support (15) and the steel beam (2), the cover plate (82) being correspondingly arranged on the lower surface of the upper flange or the upper surface of the lower flange of the butt joint between the steel cantilever beam support (15) and the steel beam (2), the bottom plate (81) and the cover plate (82) being locked and fixed by inter-beam connection bolts (9) passing through the through holes (83) and the through holes (84) on the flanges.

2. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The concrete floor slab (3) is provided with a floor slab reserved operation slot (5) directly opposite to the replaceable component (4) installed on the steel cantilever beam support (15) and the upper flange of the steel beam (2), and a prefabricated cover plate (7) is installed on the notch of the floor slab reserved operation slot (5).

3. The replaceable and detachable new assembled beam-slab-column node according to claim 2 is characterized in that: A pre-embedded connecting steel member (6) is pre-embedded on the notch of the reserved operating slot (5) of the floor slab. The pre-embedded connecting steel member (6) is an annular steel plate. The central portion of the pre-embedded connecting steel member (6) has a through opening that matches the shape of the reserved operating slot (5) of the floor slab. The pre-embedded connecting steel member (6) is provided with threaded holes (61) for connecting with the prefabricated cover plate (7) using bolts.

4. The replaceable and detachable new assembled beam-slab-column node according to claim 3 is characterized in that: The prefabricated cover plate (7) comprises a prefabricated channel steel shell (11), wings arranged around the prefabricated channel steel shell (11), and a concrete filling block (12) buried in the prefabricated channel steel shell (11); the outer peripheral shape and size of the prefabricated channel steel shell (11) match the reserved operation through groove (5) of the floor slab; the wings are provided with a hole for passing a cover plate connecting bolt (13); the cover plate connecting bolt (13) is threadedly connected and fixed to the threaded hole (61).

5. The replaceable and detachable new assembled beam-slab-column node according to claim 4 is characterized in that: A pull ring (14) is pre-embedded on the concrete filling block (12) for easy lifting.

6. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The bottom plate (81) and the cover plate (82) are both rectangular plates. The bottom plate (81) and the cover plate (82) have the same length and thickness. The width of the cover plate (82) is less than half the width of the bottom plate (81). The side edge is provided with an inner concave portion (85) facing the joint between the cantilever beam support (15) and the steel beam (2), so as to form a vulnerable portion in the inner concave portion (85).

7. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The bolt head of the floor slab built-in bolt (10) is pre-buried in the concrete floor slab (3), and two nuts are screwed onto the screw rod portion of the floor slab built-in bolt (10), one of the nuts is also pre-buried in the concrete floor slab (3), and the other nut is screwed onto the lower portion of the screw rod portion passing through the reserved bolt hole (21).

8. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The prefabricated steel structure column (1) is any type of steel column or steel-concrete column.

9. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The I-shaped steel cantilever beam support (15) is pre-welded and fixed to the prefabricated steel structure column (1).

10. The replaceable and detachable new assembled beam-slab-column node according to claim 1 is characterized in that: The inter-beam connecting bolts (9), floor slab internal bolts (10), and cover plate connecting bolts (13) are all high-strength bolts; and web connecting plates (22) are provided at the webs of the cantilever beam support (15) and the steel beam (2).

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