An L-shaped steel pipe column modular steel structure connection node between modules

Abstract

The present invention belongs to the technical field of steel structure engineering, and particularly relates to a connection node between modular steel structures of an L-shaped steel pipe column, which can not only ensure the accuracy of the welded part, but also reduce the on-site construction time and improve the assembly efficiency. The upper module column, the lower module column and the connecting piece are welded in the factory and transported to the construction site. First, the pins welded at the bottom of the upper module column are inserted into the holes reserved in the horizontal connecting plate and the lower cover plate for positioning, and provide initial shear stiffness for the upper module column and the lower module column. Then, through bolts are used for connection. The horizontal connecting plate and the cross connecting plate effectively connect eight modular L-shaped cold-formed thin-walled steel pipe columns at the middle column node, making the force transmission more reasonable and facilitating the interaction between columns. The equal-leg angle steel effectively connects the concave surfaces on the outer sides of the upper module column and the lower module column, overcoming the problem that it is difficult to effectively connect the upper and lower module columns in modular steel structure nodes, and improving the stiffness and strength of the connection node.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure engineering, and relates to a connection node between L-shaped steel pipe column modular steel structures, which can avoid the exposure of column corners, increase the contact area between modules, improve the bearing capacity and on-site assembly efficiency. Background Art

[0002] Modular steel structure refers to a new structural form in which box-type modules are prefabricated in a factory first and then transported to the construction site for the assembly of beams and columns between each module. It has the characteristics of fast assembly and strong flexibility. During the modular assembly process, the strength of the connection nodes between modules determines the strength of the entire structural system. Therefore, the key to strengthening the modular steel structure system lies in the design of the connection nodes between modules. The quality of the connection nodes determines the level of various mechanical indexes of the modular steel frame structure system. Most of the existing steel frame modules adopt on-site full-bolt or welding connection forms, which affect the installation efficiency. It is difficult to grasp the construction space left for welding at the nodes, and there is insufficient restraint on the beam-column module kits, resulting in insufficient stiffness at the nodes. Moreover, no treatment is done between the steel columns at the nodes, making the integrity between the steel columns insufficient. For example, a connection node between assembled modular steel frame modules disclosed in Chinese Patent No. 202120938427 is used to connect the upper module column and the lower module column located directly below it. The node includes: column top plates, which are arranged in one-to-one correspondence with the lower module columns to be connected and are welded to the upper ports of the lower module columns; connection components, which are arranged in one-to-one correspondence with the column top plates; and a horizontal connecting plate, which is arranged above the column top plates. The horizontal connecting plate is fixedly connected to the column top plates through the connection components. The lower port of the upper module column is welded to the upper surface of the horizontal connecting plate. The connection components further include: at least one one-way bolt, a first bolt hole, which is arranged in one-to-one correspondence with the one-way bolt and is opened on the column top plate, and a second bolt hole, which is arranged in one-to-one correspondence with the first bolt hole and is opened on the horizontal connecting plate. The second bolt hole is connected to the first bolt hole through the one-way bolt. A modular steel frame connecting device disclosed in Chinese Patent No. 201611103154 includes at least a first square steel pipe column and a second square steel pipe column with a hollow interior. The first square steel pipe column and the second square steel pipe column are connected by an inner sleeve. The inner sleeve has a clearance fit with the first square steel pipe column and the second square steel pipe column. A positioning block parallel to the column ports of the first square steel pipe column and the second square steel pipe column is annularly arranged on the outer periphery of the inner sleeve.A modular steel frame connection structure disclosed in Chinese Patent No. 202110506571 is formed at the splicing joint between module units and includes a spatial connector; the module units are spliced through the spatial connector; each module unit participating in the splicing includes a vertical frame column and two horizontal frame beams, and the ends of the two frame beams are fixedly connected to the flange ends of a frame column, thereby forming a spatial right-angle structure; the ends of the frame column and the other two flange ends of the frame column are connection surfaces; the spatial connector includes a connection web and connection parts corresponding to the number of module units, and the connection parts are fixedly connected through the connection web to form the spatial connector; the connection parts include a horizontal connection plate and a vertical connection plate; the end of the vertical connection plate is fixedly connected to the horizontal connection plate, the connection surface located at the end of the frame column is fixedly connected to the horizontal connection plate, and the connection surface located at the flange end of the frame column is fixedly connected to the vertical connection plate; during splicing, multiple module units are simultaneously fixedly connected to the same spatial connector; the frame columns and the two frame beams of two module units spliced vertically are aligned vertically respectively; when splicing horizontally, the frame columns of two adjacent module units on the same layer are aligned horizontally. Therefore, it is of great significance to develop and design a connection form with excellent mechanical properties, meeting the requirement of "strong column and weak beam" and high construction efficiency for the development of the modular steel structure system. Summary of the Invention

[0003] The object of the present invention is to overcome the shortcomings of the prior art and seek to design a prefabricated steel frame module connection node, which uses an L-shaped cold-formed thin-walled steel pipe column and has the advantages of reasonable force, strong integrity, comfortable use function, convenient installation and large stiffness.

[0004] To achieve the above object, the main structure of the connection node between modules of the L-shaped steel pipe column modular steel structure according to the present invention includes an upper module column and a lower module column of a cross-shaped structure connected by a connector in a cross shape.

[0005] The upper module column involved in the present invention is composed of four upper corner columns of an L-shaped structure, and the lower module column is composed of four lower corner columns of an L-shaped structure. The upper corner columns and the lower corner columns are arranged in one-to-one correspondence to improve the installation accuracy. During construction, only through bolts need to be installed, saving the assembly time and labor intensity at the construction site; the connector is welded by a horizontal connection plate after punching, cross-shaped connection plates arranged on its upper and lower surfaces and equal-leg angle steels arranged on its sides, and has good integrity. The connector is connected to the upper module column and the lower module column through through bolts and preset holes, which can effectively connect the upper module column and the lower module column, improve the stiffness of the connection node, optimize the force transmission between the upper module column and the lower module column, and solve the problem of ineffective connection between the upper and lower columns of the steel structure modularization.

[0006] The upper corner column involved in the present invention is welded by an upper pipe column made of perforated L-shaped cold-formed thin-walled steel, a floor beam with an H-shaped structure, an upper cover plate with a perforated L-shaped structure and pins arranged thereon, wherein the pins can enhance the initial shear stiffness of the connection node and position the upper module column and the lower module column; the lower corner column is welded by a lower pipe column made of perforated L-shaped cold-formed thin-walled steel, a ceiling beam with an H-shaped structure, and a lower cover plate with a perforated L-shaped structure.

[0007] Compared with the prior art, the present invention can not only ensure the accuracy of the welded part, but also reduce the on-site construction time and improve the assembly efficiency. The upper module column, the lower module column and the connecting piece are welded in the factory and transported to the construction site. First, the pins welded at the bottom of the upper module column are inserted into the holes reserved in the horizontal connecting plate and the lower cover plate for positioning and providing the initial shear stiffness for the upper module column and the lower module column. Then, through bolts are used for connection. The horizontal connecting plate and the cross connecting plate effectively connect eight modular L-shaped cold-formed thin-walled steel pipe columns at the middle column node, making the force transmission more reasonable and facilitating the interaction between columns. The equal-leg angle steel effectively connects the concave surfaces on the outer sides of the upper module column and the lower module column, overcomes the problem that it is difficult to effectively connect the upper and lower module columns in the modular steel structure node, and improves the stiffness and strength of the connection node; its structure is simple, and the connecting piece realizes the effective connection of the upper module column and the lower module column, which not only avoids the phenomenon that the column corners are exposed outside and affect the building appearance, but also overcomes the problem of insufficient construction space for the effective connection of the connection node. Brief Description of the Drawings

[0008] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0009] Figure 2 It is a schematic diagram of the connection relationship of the main structure of the present invention.

[0010] Figure 3 It is a schematic diagram of the main structure of the upper module column involved in the present invention.

[0011] Figure 4 It is a schematic diagram of the connection relationship of the main structure of the upper module column involved in the present invention.

[0012] Figure 5 It is a schematic diagram of the main structure of the lower module column involved in the present invention.

[0013] Figure 6 It is a schematic diagram of the connection relationship of the main structure of the lower module column involved in the present invention.

[0014] Figure 7 It is a schematic diagram of the main structure of the connecting piece involved in the present invention.

[0015] Figure 8Schematic diagram of the connection relationship of the main structure of the connector involved in the present invention.

[0016] Figure 9 Schematic comparison diagram between the present invention and the connection node between prefabricated modular steel frame modules. Specific embodiments

[0017] The present invention will be further described below through implementation examples in conjunction with the drawings.

[0018] Embodiment 1:

[0019] The main structure of the connection node between L-shaped steel pipe column modular steel structure modules involved in this embodiment includes an upper module column 1, a lower module column 2 and a connector 3. The upper module column 1 and the lower module column 2 are connected into an integral structure through the connector 3 and through bolts 7. Among them, the upper module column 1 is composed of four upper module corner columns 5. The main structures of each upper module corner column 5 are the same, and each includes an upper pipe column 11, a floor beam 12, an upper cover plate 13 and a pin 14. Floor beams 12 are respectively arranged at both ends of the L-shaped upper pipe column 11, and an upper cover plate 13 is arranged at the bottom end. A number of pins 14 are arranged on the upper cover plate 13. The lower module column 2 is composed of four lower module corner columns 6. The main structures of each lower module corner column 6 are the same, and each includes a lower pipe column 21, a ceiling beam 22 and a lower cover plate 23. Ceiling beams 22 are respectively arranged at both ends of the L-shaped lower pipe column 21, and a lower cover plate 23 is arranged at the top end. The main structure of the connector 3 includes a horizontal connecting plate 31, a cross-shaped connecting plate 32 and an equal-leg angle steel 33. Cross-shaped connecting plates 32 are arranged on both the upper and lower surfaces of the horizontal connecting plate 31, and the four corners are concave, and equal-leg angle steels 33 are arranged.

[0020] The cross-shaped connecting plate 32 and the equal-leg angle steel 33 involved in this embodiment form four L-shaped spaces with equal areas on both the upper and lower surfaces of the horizontal connecting plate 31. The upper L-shaped space is used to install the upper module column 1, and the lower L-shaped space is used to install the lower module column 2.

[0021] The punching and welding treatments involved in this embodiment are all carried out in the factory. During the construction site, only the upper module column 5 and the lower module column 6 need to be assembled in the L-shaped spaces on the upper and lower surfaces of the connector 3 and fixed through the through bolts 7. The construction progress of the connection node is fast, the efficiency is high, and the requirements for stiffness and horizontal force transmission are met.

[0022] Embodiment 2:

[0023] The main structure of the connection node between modular steel structures of the L-shaped steel pipe column involved in this embodiment is the same as that in Embodiment 1. Following the prefabrication concept, during construction, a fully bolted connection form is adopted, and it takes only 5-6 seconds on average to install one bolt. Compared with the weld connection whose on-site quality is difficult to guarantee and is time-consuming, the overall stiffness and installation efficiency of the connection node are greatly improved. Specifically, the dowel pin 14 is inserted into the reserved holes of the upper cover plate 13, the lower cover plate 23, and the horizontal connection plate 31, which not only facilitates the positioning of the upper module column 1 and the lower module column 2 and improves the assembly efficiency, but also increases the horizontal shear stiffness between the upper module column 1 and the lower module column 2, and can avoid engineering accidents caused by large-scale slippage between the upper module column 1 and the lower module column 2. Among them, the through bolts 7 are M24 high-strength bolts; the specifications of the upper pipe column 11 and the lower pipe column 21 are both 300*150*150*8 mm; the specification of the floor beam 12 is H300*150*9*6 mm; the specifications of the upper cover plate 13, the lower cover plate 23, and the horizontal connection plate 31 are all 300*150*10 mm; the diameter of the dowel pin 14 is 24 mm; the specification of the ceiling beam 22 is H150*150*6*5 mm; the specification of the equal-leg angle steel 33 is 150*10 mm.

[0024] In this embodiment, L-shaped cold-formed thin-walled steel pipe columns are respectively used as the upper pipe column 11 of the upper module column 1 and the lower pipe column 21 of the lower module column 2. Compared with a connection node between modular steel frames disclosed in Chinese Patent No. 202120938427 (using square steel columns as the corner columns of the module), the problem of the exposed column corners affecting the building aesthetics is avoided.

[0025] In this embodiment, the through bolts 7 are installed on the concave surfaces of the upper pipe column 11 and the lower pipe column 21. Compared with a modular steel frame connection device disclosed in Chinese Patent No. 201611103154, there is no need to damage the wall panels of the upper module column 1 and the lower module column 2, avoiding the subsequent process of filling the wall panels, improving the economic benefits, and reducing the waste of materials.

[0026] The gap between the floor beam 12 and the ceiling beam 13 involved in this embodiment is only 10 mm. Compared with a tension bolt connection device between modular steel frames disclosed in Chinese Patent No. 202320010152, the net height of the building is increased, and the effective connection between the upper module column 1 and the lower module column 2 is realized through the connecting piece with a cross structure, enabling the effective transfer of the bending moment between the upper module column 1 and the lower module column 2, enhancing the overall lateral resistance of the connection node, and providing a basis for the development of steel structure modularization towards multi-high-rise buildings.

[0027] Embodiment 3:

[0028] The main structure of the connection node between modular steel structures of the L-shaped steel pipe column involved in this embodiment is the same as that of Embodiment 1. The prefabrication of the assembled building is maximized. The processing and welding of each component are carried out in the factory. The construction quality of the module unit can be comprehensively inspected, the manufacturing error can be controlled, and the impact on the on-site installation work can be reduced, ensuring the construction quality of the modular building.

[0029] This embodiment shortens the construction time. While the on-site foundation construction of the building is in progress, the manufacturing of the module unit can be carried out synchronously in the factory. After the foundation construction is completed, the module unit can be transported to the construction site for hoisting. Moreover, the construction process of the modular building is less restricted by the weather, greatly reducing the construction period, enabling earlier delivery and earlier recovery of investment costs and benefits.

[0030] This embodiment saves manpower. The factory construction adopts assembly line operation, with a single technical requirement for workers and high construction efficiency. Compared with the traditional construction method, it can greatly reduce the labor intensity and wage cost of manpower; and due to the construction environment of the factory, the utilization rate of materials can be maximized, and the construction waste from the factory and the site can be controlled below 5%.

[0031] The construction process of this embodiment is green and environmentally friendly, reducing the generation of construction waste. Based on the form of dry operation, it reduces the vehicle flow, dust and noise on-site, and greatly reduces the impact on the living environment of surrounding residents.

Claims

1. An L-shaped steel pipe column modular steel structure connection node between modules, the main structure includes an upper module column and a lower module column connected by a connecting piece, and is characterized in that, Both the upper module column and the lower module column are in a cross-shaped structure, and the connecting piece is in a cross-shaped structure. The upper module column is composed of four upper corner columns with an L-shaped structure, and the lower module column is composed of four lower corner columns with an L-shaped structure. The upper corner columns and the lower corner columns are arranged in one-to-one correspondence. The connecting piece is welded by a horizontally connecting plate that has been punched, cross-shaped connecting plates arranged on its upper and lower surfaces, and equal-leg angle steels arranged on its sides. The upper corner column is welded by an upper pipe column of L-shaped cold-formed thin-walled steel that has been punched, a floor beam in an H-shaped structure, an upper cover plate in an L-shaped structure that has been punched, and a plug arranged thereon. The lower corner column is welded by a lower pipe column of L-shaped cold-formed thin-walled steel that has been punched, a ceiling beam in an H-shaped structure, and a lower cover plate in an L-shaped structure that has been punched. The connecting piece is connected to the upper module column and the lower module column through through bolts and preset holes.

2. The connecting node between the modular steel structures of the L-shaped steel pipe columns according to claim 1, characterized in that, The plug enhances the initial shear stiffness of the connection node and positions the upper module column and the lower module column.

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