A new type of double sleeve split bolt assembly joint for steel structure module assembly

Abstract

This invention proposes a double-sleeve-tie bolt connection node suitable for modular steel structure assembly, aiming to solve the problem of traditional bolt connections requiring large operating holes at the ends of the modular steel pipe columns, resulting in severe weakening of the column cross-section. It relates to the assembly of modules in the field of modular steel structure construction. The node includes an inner sleeve housed within the lower modular column, an outer sleeve fitted over the outside of the module column, and a high-strength tie bolt penetrating all three. During installation, the end of the upper modular column is inserted into the gap between the inner and outer sleeves, and the tie bolt is tightened to securely connect the inner and outer sleeves to the upper and lower modular columns. This invention eliminates the need for large holes in the main load-bearing sections of the column, significantly reducing cross-sectional weakening; installation can be completed within the existing equipment maintenance space between modules, making construction convenient, the connection reliable, capable of withstanding shear forces, and offering the advantages of being detachable and reusable. It is suitable for modular prefabricated steel structure construction technology.

Description

Technical Field

[0001] This invention relates to the field of modular steel structure construction, and more specifically to a mechanical connection node used in modular steel structure buildings to connect adjacent steel structure modules vertically or horizontally. Background Technology

[0002] Modular steel structure buildings are a construction method where spatial units such as rooms are prefabricated in a factory into independent steel structural modules with load-bearing systems. These modules are then transported to the site and assembled like building blocks to form a complete building. The core technical aspect of this type of construction on-site lies in the reliable connection between modules, ultimately forming a complete building structure. This construction method significantly reduces on-site wet work, shortens the construction cycle, and reduces environmental impact. Currently, the connection between modules is mostly achieved through welding or bolting. Welded connections offer good overall integrity, but on-site operations are demanding, resulting in low construction efficiency and difficulty in meeting the rapid assembly requirements of modular buildings. Furthermore, the excessive rigidity of welded joints and poor deformation capacity are detrimental to the energy dissipation of the structure under dynamic loads such as earthquakes, negatively impacting the building's seismic resistance. Traditional bolted connections typically require large operating holes at the column ends to facilitate bolt installation and tightening within the column. This significantly weakens the effective cross-section of the column, disrupts the continuity of the steel, causes stress concentration, affects the local load-bearing capacity of the joints and the overall stiffness of the module, and becomes a potential safety hazard for the structure. Therefore, there is an urgent need in this field for a new type of connection node that can ensure connection strength, integrity, and stability, meet the load-bearing requirements of building structures, eliminate the need for large weakening holes in the main load-bearing columns, and offer advantages such as convenient construction and reliable performance. The double sleeve can provide the node with a certain shear resistance and compensate for the weakening of the column cross-section caused by the bolt holes. The preload of the tie bolts can tightly connect the inner and outer sleeves to the square steel tube column, making the connection more reliable. Furthermore, compared to welding, it allows the node to have a certain degree of deformation capacity, thus improving seismic performance. Summary of the Invention

[0003] This invention aims to overcome the numerous disadvantages of traditional bolt-cap plate assembly nodes in steel structure module connections, and provides a novel double-sleeve-tie bolt connection node. Its main technical problem is to avoid the cross-sectional weakening caused by creating large-sized operating holes in the main load-bearing columns of the module, while providing a module connection solution that is easy to install, reliable in connection, and has a certain degree of seismic resistance.

[0004] To achieve the above objectives and ensure the mechanical properties and construction compatibility of the nodes, the present invention adopts the following technical solution:

[0005] A double-sleeve tie bolt connection node suitable for steel structure module assembly, used to connect the module columns of a first module and a second module, characterized in that: the node includes an inner sleeve, an outer sleeve and at least one set of high-strength tie bolts.

[0006] The double-sleeve-tie bolt assembly joint consists of two sleeves that just clamp the module column and high-strength tie bolts. The sleeves can be made of appropriately sized square steel tubing or welded from steel plates; the specific dimensions can vary depending on the column cross-section. Bolt holes are pre-drilled at the sleeves and column ends, and the tie bolts are installed after on-site assembly.

[0007] The inner sleeve is housed within the cavity at the end of the module column of the first module.

[0008] The outer sleeve is fitted around the outer periphery of the end of the module column of the first module.

[0009] The inner sleeve and the outer sleeve have corresponding bolt holes.

[0010] The end of the module column of the second module is inserted into the gap between the inner sleeve and the outer sleeve, and bolt holes are correspondingly opened on its column body.

[0011] The high-strength tie bolts pass through the corresponding bolt holes on the outer sleeve, the module column of the second module, and the inner sleeve in sequence, and are tightly pressed together by the fastening nuts to form a rigid connection.

[0012] Preferably, the inner sleeve and the outer sleeve can be made of square steel tubes that are adapted to the cross-sectional shape of the module column, or welded from steel plates.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) Minimize cross-sectional weakening: There is no need to open large operating holes in the module column body. Only standard bolt holes need to be reserved, which preserves the original cross-section of the load-bearing column to the greatest extent and ensures the strength and stiffness of the node.

[0015] (2) Convenient construction: All components can be prefabricated in the factory. On-site, only the holes need to be aligned and the tie bolts tightened. The installation speed is fast and the requirements for operating space are low. The inherent equipment maintenance space at the corner of the module can be fully utilized.

[0016] (3) Reliable connection and good mechanical properties: The double sleeve structure works together to effectively improve the shear resistance and bending stiffness of the node. The preload provided by the tie bolts ensures that the sleeve and the module column fit tightly together, and the connection is reliable.

[0017] (4) It has a certain degree of seismic ductility: Compared with rigid welding, bolted connection allows the node to undergo small relative deformation under huge loads, which can absorb and dissipate some of the seismic energy and improve the seismic performance of the node.

[0018] (5) Applicable to modular prefabricated construction technology for steel structures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly node of this novel assembly node at the vertical assembly position.

[0020] Figure 2 This is a schematic diagram of the assembly node of this novel assembly node at the horizontal assembly position.

[0021] Figure 3 For the corresponding Figure 1 Assembly flowchart for location nodes.

[0022] Figure 4 For the corresponding Figure 1 Location node decomposition diagram.

[0023] In the diagram: 1 is the upper module, 2 is the lower module, 3 is the outer sleeve of the assembly node, 4 is the module column, 5 is the inner sleeve of the assembly node, 6 is the tie bolt, 7 is the module beam, 8 is the module floor slab, 9 is the module exterior wall cladding panel, 10 is the module exterior wall light steel keel column, 11 is the upper and lower guide rails on the module exterior wall, and 12 is the module exterior wall pull-out connector.

[0024] This new assembly node is not only applicable to Figure 1 , 2 The assembly position shown can be used for assembly at other assembly positions as well. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] The core of the connection node of the present invention lies in the use of inner and outer double sleeves to clamp the module column and lock it with high-strength tie bolts.

[0027] First, prefabrication is carried out in the factory:

[0028] (1) At the end of the module column 4 of the first module (below module 2), bolt holes are reserved according to the design position.

[0029] (2) Based on the inner cavity size of the module column 4, make or select a square steel tube with a slightly smaller cross section as the inner sleeve 5, and reserve bolt holes at the corresponding positions.

[0030] (3) Based on the external dimensions of the module column 4, make or select a square steel pipe with a slightly larger cross section as the outer sleeve 3, and reserve bolt holes at the corresponding positions.

[0031] Next, on-site installation will be carried out:

[0032] (1) Insert the prefabricated inner sleeve 5 into the cavity at the end of the module post 4 of the first module (lower module 2). Use locating pins or small clamps for temporary fixation, ensuring that the bolt holes of the inner sleeve 5 are precisely aligned with the bolt holes of the module post 4. Spot welding should be avoided to preserve the original properties of the material and facilitate adjustment.

[0033] (2) Fit the outer sleeve 3 onto the outer side of the module post 4 of the first module. Similarly, take positioning measures to ensure that the bolt holes of the outer sleeve 3 are precisely aligned with the bolt holes of the module post 4.

[0034] (3) Hoist the second module (such as the upper module 1) and slowly and accurately insert the end of its module column 4 into the gap between the installed inner and outer sleeves. During this process, it is necessary to ensure that the bolt holes on the second module column are aligned with the bolt holes on the inner and outer sleeves.

[0035] (4) After all the bolt holes are aligned, insert the high-strength tie bolt 6 from one side, so that it passes through the outer sleeve 3, the module column of the second module, and the inner sleeve 5 in sequence.

[0036] (5) Tighten a high-strength nut on the other end of the tie bolt 6 using a torque wrench or other tools to the designed preload. The preload of the bolt will press the inner sleeve 5, the module column of the second module, and the outer sleeve 3 tightly into a whole to jointly bear the load.

[0037] After installation, this joint not only reliably transmits axial and shear forces, but its sleeve structure also enhances compensation for the column section at the opening. The tie bolt connection provides the joint with a degree of flexibility, which helps improve the overall seismic performance of the building. Because of these numerous advantages, this assembly joint can be vigorously developed and expanded for use in practical building engineering.

Claims

1. A double-sleeve tie bolt connection node for assembling steel structure modules, used to connect the module columns of a first module and the module columns of a second module, characterized in that: This node is composed of high-strength tie bolts connecting the inner and outer sleeves to the modular columns. It has advantages such as being detachable and reusable, and is suitable for modular prefabricated construction technology of steel structures. The inner sleeve is housed within the cavity at the end of the module column of the first module; The outer sleeve is fitted around the outer periphery of the end of the module column of the first module; The inner sleeve and the outer sleeve have corresponding bolt holes; The end of the module column of the second module is inserted into the gap between the inner sleeve and the outer sleeve, and bolt holes are correspondingly opened on its column body; The high-strength tie bolts pass sequentially through the outer sleeve, the module column of the second module, and the corresponding bolt holes on the inner sleeve.

2. The double-sleeve-tie bolt connection node according to claim 1, characterized in that: The cross-sectional shapes of the inner sleeve and outer sleeve are adapted to the cross-sectional shape of the module column.

3. The double-sleeve-tie bolt connection node according to claim 2, characterized in that: The inner sleeve and outer sleeve are cold-formed square steel tubes or square steel tubes welded from steel plates. The specific dimensions can be changed according to the cross-sectional dimensions of the module column and the shear resistance required for the assembly position.

4. The double-sleeve-tie bolt connection node according to claim 1, characterized in that: The number of high-strength tie bolts is two or more sets, which are evenly or symmetrically arranged along the circumference of the module column.

5. The double-sleeve-tie bolt connection node according to claim 1, characterized in that: The connection node is used to connect adjacent modules in the vertical direction.

6. The double-sleeve-tie bolt connection node according to claim 1, characterized in that: The connection node is used to connect adjacent left and right modules in the horizontal direction. The inner sleeve is housed in the module column of the first module, and the outer sleeve is simultaneously fitted on the outer periphery of the adjacent module column ends of the first module and the second module. The tie bolt passes through the outer sleeve, the module column of the first module, the module column of the second module, and the inner sleeve.

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