A single-sided bolted connection joint for closed section members and a method of installation

Abstract

The application discloses a single-side bolt connecting joint suitable for a closed section member and a mounting method. The single-side bolt connecting joint comprises two rectangular steel pipes, a sleeve assembly and high-strength bolts. The two rectangular steel pipes are coaxially arranged and connected into an integrated structure through the sleeve assembly. The inner contour of the rectangular steel pipe is matched with the outer contour of the sleeve assembly. The end of the wall plate of the rectangular steel pipe is provided with a bolt hole one. The wall plate of the sleeve assembly is provided with a bolt hole. The high-strength bolt is connected and fixed with the bolt hole of the sleeve assembly after penetrating through the bolt hole one of the rectangular steel pipe, so that the rectangular steel pipe is coaxially arranged outside the sleeve assembly. The sleeve assembly is mainly composed of an inner sleeve, an anchor plate and a punched steel plate which are sequentially connected. The anchor plate is provided with a nut matched with the high-strength bolt. The single-side locking of the high-strength bolt can be completed without changing the mechanical properties of the joint area of the closed section member, the defects existing in the connecting mode of the ordinary bolt in the existing closed section member are solved, and the mounting is quick and efficient.

Description

Technical Field

[0001] This invention belongs to the field of building steel structure node connection technology, and specifically relates to a single-sided bolt connection node and installation method suitable for closed section members. Background Technology

[0002] Compared to traditional concrete buildings, steel structure buildings offer greater efficiency, speed, and flexibility in construction. A key factor in achieving this lies in the connection technology of the joints. Currently, steel structures primarily utilize welding and bolting connections. Welding requires highly skilled welders, presenting a significant technical barrier, and its production efficiency is low, with weld quality difficult to guarantee. Therefore, bolting connections are generally preferred in design and construction, and this will be a key research direction for future steel structure component connection methods.

[0003] Generally, if steel beams and columns are designed with open cross-sections, sufficient working space can be provided for bolting operations. However, calculations show that, for the same cross-sectional area, closed-section members, represented by rectangular steel tubes, have similar stiffness in both principal axis directions, thus exhibiting better stability and resistance to bending and torsion. Furthermore, they are aesthetically pleasing and possess superior fire resistance and corrosion resistance compared to open-section members, making them more suitable for steel structure construction. However, closed sections significantly limit the working space for bolting; workers can only operate from the outside of the member, and traditional bolts are not effective for connection. Therefore, several unidirectional bolts capable of single-sided locking have been invented both domestically and internationally, such as the Hollo Bolt and its improved RMH bolt, Blind Bolt, Ultra Twist, and ONESIDE Fastener internationally, and the self-locking STUCK-BOM, nested single-sided high-strength bolts, and grease-injected unidirectional bolts domestically. These bolts can achieve the target requirement of tightening on one side, but considering that some bolt accessories are relatively precise, have high processing requirements, and are difficult to control in terms of cost, there is still room for improvement in terms of convenience and economy. Therefore, they are not conducive to widespread adoption in China. Summary of the Invention

[0004] In order to solve the problems existing in the background art, the purpose of this invention is to provide a single-sided bolt connection node and installation method suitable for closed section members, so as to solve the defects existing in the connection methods of closed section members.

[0005] The technical solution adopted in this invention is as follows: I. A bolted connection node suitable for closed-section members: It includes two rectangular steel pipes, a sleeve assembly, and high-strength bolts; the two rectangular steel pipes are coaxially arranged and connected into an integral structure by the sleeve assembly. The inner contour of the rectangular steel pipes is adapted to the outer contour of the sleeve assembly. Several bolt holes are opened at the ends of the rectangular steel pipe wall plates, and several bolt holes are opened on the sleeve assembly wall plates. The high-strength bolts pass through the bolt holes on the rectangular steel pipes and are connected and fixed to the matching nuts on the sleeve assembly, so that the rectangular steel pipes are coaxially sleeved on the outside of the sleeve assembly.

[0006] The sleeve assembly is mainly composed of an inner sleeve, an anchor plate, and a stamped steel plate connected in sequence. The inner sleeve has a bolt hole 2 for inserting a high-strength bolt on one side of its inner circumference. The bolt hole 2 and bolt hole 1 have the same specifications. The outer circumference of the inner sleeve wall plate has a connecting hole 1 for connecting the anchor plate and the stamped steel plate. The inner wall of the connecting hole 1 has an internal thread that matches the first bolt. The inner circumference of the anchor plate is provided with a number of hexagonal holes. The number and arrangement of the hexagonal holes and bolt holes are the same and aligned. The outer circumference of the anchor plate is provided with a number of connecting holes for connecting the inner sleeve and the stamped steel plate. The number and arrangement of connecting holes are the same and aligned with those of connecting holes. The inner circumference of the stamped steel plate is provided with several bolt holes 3. The number and arrangement of bolt holes 3 and bolt holes 2 are the same and aligned. Bolt holes 3 are provided with a hexagonal groove around their outer periphery. The hexagonal groove is mainly formed by stamping the stamped steel plate in the direction away from the anchor plate. The outer circumference of the stamped steel plate is provided with several connecting holes 3 for connecting the inner sleeve and the anchor plate. The number and arrangement of connecting holes 3 and connecting holes 1 are the same and aligned.

[0007] The sleeve assembly also includes a matching nut and a washer. The washer is disposed between the inner sleeve and the anchor plate, and the washer is located at the bolt hole position of the inner sleeve. The matching nut is installed at the hexagonal hole position of the anchor plate, such that the hexagonal groove of the stamped steel plate covers the surface of the matching nut. Both the nut and the washer have through holes in the middle for inserting high-strength bolts.

[0008] The first bolt passes through the connecting hole three of the stamped steel plate and the connecting hole two of the anchor plate in sequence, and is then threadedly connected to the connecting hole one of the inner sleeve; the high-strength bolt passes through the bolt hole one on the rectangular steel pipe and the bolt hole two of the inner sleeve in sequence, and is then threadedly connected to the matching nut.

[0009] The connecting hole three of the stamped steel plate, the connecting hole two of the anchor plate, and the connecting hole one of the inner sleeve are of the same specification; the bolt hole three of the stamped steel plate and the bolt hole of the matching nut are of the same specification as the bolt hole two of the inner sleeve.

[0010] The external thread of the high-strength bolt matches the internal thread of the matching nut.

[0011] II. An installation method for the bolted connection node, comprising the following steps: Step S1: First, stack the inner sleeve, gasket, and anchor plate in sequence, so that the bolt holes in the inner sleeve and the hexagonal holes in the gasket and anchor plate are in a one-to-one correspondence. Then, insert the matching nut that matches the high-strength bolt into the hexagonal hole of the anchor plate. Step S2: Align the hexagonal groove on the stamped steel plate with the embedded matching nut, and cover the stamped steel plate on the matching nut. Then, use the first bolt to pass through the connecting hole three of the stamped steel plate and the connecting hole two of the anchor plate in sequence, and then thread it to the connecting hole one of the inner sleeve, so that the inner sleeve, the anchor plate and the stamped steel plate are connected into an integral sleeve assembly. Step S3: Use the inner sleeve to coaxially connect the two rectangular steel pipes into an integrated node.

[0012] Step S3 specifically involves: The end of a rectangular steel pipe is fitted onto one side of the inner sleeve. Then, a high-strength bolt is passed through the bolt hole 1 on the rectangular steel pipe, the bolt hole 2 on the inner sleeve, and the washer in sequence, and then threaded with the matching nut to complete the connection between the rectangular steel pipe and the inner sleeve. Next, the end of another rectangular steel pipe is fitted onto the other side of the inner sleeve, and the other rectangular steel pipe is connected to the inner sleeve using high-strength bolts, thereby connecting the two rectangular steel pipes into an integrated structure through the inner sleeve.

[0013] In step S1, the gasket is prevented from slipping off during subsequent installation by bonding the gasket or adding magnetism to the gasket.

[0014] The technical principle of this invention is as follows: 1) When connecting closed-section components using an inner sleeve, the matching hexagonal nut is pre-embedded in the hexagonal hole of the anchor plate, and a stamped steel plate is placed on top. The anchor plate and the stamped steel plate are fixed to the inside of the inner sleeve by bolts. Due to the fixing effect of both on the nut, the installer can pass the high-strength bolt through the bolt holes of the component and the inner sleeve from the outside of the component, and finally rotate the bolt into the nut to achieve the purpose of tightening.

[0015] 2) After the nut is inserted into the hexagonal hole of the anchor plate, its translation on the plane of the anchor plate and its rotation around its own axis are restricted. Then, a stamped steel plate is placed on top for fixation, which can ensure that the nut will not rotate synchronously with the bolt or be pushed out along the axis when the high-strength bolt is screwed in.

[0016] 3) The gasket is fixed between the anchor plate and the inner sleeve by friction. Using adhesive or magnetic gaskets can ensure that the gasket will not slip or shift during installation.

[0017] 4) At the connection node, the method provided by this invention is used to complete the unidirectional installation of bolts, which avoids cutting the component, ensures the integrity of the end node area of ​​the component, makes the actual component situation more consistent with the calculation model, and ensures the reliability of the calculation results.

[0018] Compared with current steel structure component connection technologies and devices, this invention has the following advantages: 1. It can achieve unilateral locking of high-strength bolts without changing the mechanical properties of the joint area of ​​closed section members, thus solving the defects of ordinary bolts in the existing connection methods of closed section members; 2. Compared with some unidirectional bolts that can achieve single-sided locking, the high-strength bolts, nuts and washers of this invention do not require special customization, and are simple to process and convenient to use; 3. When the high-strength bolts of the present invention are installed on site, only the tools used for installing high-strength bolts under normal circumstances are used, no special auxiliary devices are required, and the steps are simple, making the installation quick and efficient. 4. Installation workers do not need to invest a lot of energy to adapt to the new installation method, nor do they need to have high operating skills, so the learning cost is low. 5. Compared with some one-way bolts that cannot be disassembled after installation, the bolts described in this invention are detachable bolts. They can be recycled and reused after disassembly, thereby achieving the purpose of cost reduction, efficiency improvement, energy saving and consumption reduction. They have certain economic benefits and are suitable for widespread adoption. Attached Figure Description

[0019] Figure 1 The diagram shows the assembly of the rectangular steel pipe and the inner sleeve; (a) is a top view of the assembly of the rectangular steel pipe and the inner sleeve; (b) is a cross-sectional view of the assembly of the rectangular steel pipe and the inner sleeve; and (c) is a three-dimensional schematic diagram of the assembly of the rectangular steel pipe and the inner sleeve. Figure 2 This is a three-dimensional schematic diagram of a rectangular steel pipe; Figure 3 This is a three-dimensional schematic diagram of the inner sleeve; Figure 4 This is a three-dimensional schematic diagram of the anchor plate; Figure 5 This is a three-dimensional schematic diagram of a stamped steel sheet; Figure 6 Side view and 3D model of a large hexagonal head high-strength bolt; Figure 7 A 3D schematic diagram for the matching hexagonal nut; Figure 8 This is a three-dimensional schematic diagram of the gasket; Figure 9 A schematic diagram showing the overlapping of the inner sleeve, gasket, and anchor plate; Figure 10 A schematic diagram of a nut being embedded in an anchor plate; Figure 11 This is a schematic diagram showing the connection between the stamped steel plate and the inner sleeve, etc. Figure 12 This is a schematic diagram of the assembly of the lower part of the rectangular steel pipe with the inner sleeve.

[0020] In the diagram: 101, high-strength bolt; 102, matching nut; 103, washer; 201, inner sleeve; 202, anchor plate; 203, stamped steel plate; 301, first rectangular steel pipe; 302, second rectangular steel pipe; 401, bolt hole one; 402, bolt hole two; 403, bolt hole three; 501, connecting hole one; 502, connecting hole two; 503, connecting hole three; 601, hexagonal hole; 602, hexagonal groove. Detailed Implementation

[0021] The present invention will be described in detail below with reference to specific implementation examples. These examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way.

[0022] It should be noted that the structural components and parts involved in the embodiments have been labeled with numerical serial numbers in the accompanying drawings. However, the dimensions, quantity, relative positional relationships, and arrangement of the structural components and parts are only used for illustration in the accompanying drawings and should be determined in combination with the actual situation and calculation results. In addition, the rectangular steel pipe in this embodiment does not specifically refer to rectangular cross-section steel columns, but also includes rectangular cross-section steel beams that need to be connected by bolts.

[0023] like Figures 1-2 As shown, the node includes two rectangular steel pipes to be connected, a sleeve assembly, and high-strength bolts 101. The two rectangular steel pipes are coaxially arranged and connected into an integral structure by the sleeve assembly. The inner contour of the rectangular steel pipes matches the outer contour of the inner sleeve 201 in the sleeve assembly. Several bolt holes 401 are opened at the ends of the rectangular steel pipe wall plates. The diameter of the bolt holes 401 can be a standard diameter. Several bolt holes are opened on the sleeve assembly wall plate. The high-strength bolts 101 pass through the bolt holes 401 on the rectangular steel pipes and are then connected and fixed to the nuts on the sleeve assembly, so that the rectangular steel pipes are coaxially sleeved on the outside of the sleeve assembly. The structure of the bolt holes 401 is as follows. Figure 6 As shown.

[0024] like Figure 3 As shown, the sleeve assembly is mainly composed of an inner sleeve 201, an anchor plate 202, and a stamped steel plate 203 connected in sequence; several bolt holes 402 for inserting high-strength bolts 101 are opened on the inner side wall of the inner sleeve 201. The bolt holes 402 and bolt holes 401 have the same specifications. A connecting hole 501 for connecting the anchor plate 202 and the stamped steel plate 203 is opened on the outer periphery of the inner sleeve 201 wall plate. The inner wall of the connecting hole 501 is provided with an internal thread that matches the first bolt. like Figure 4 As shown, the inner circumference of the anchor plate 202 is provided with several hexagonal holes 601. The number and arrangement of the hexagonal holes 601 and the bolt holes 402 are the same and are aligned one-to-one in the axial direction of the high-strength bolts 101. The outer circumference of the anchor plate 202 is provided with several connecting holes 502 for connecting the inner sleeve 201 and the stamped steel plate 203. The number and arrangement of the connecting holes 502 and the connecting holes 501 are the same and are aligned one-to-one in the axial direction of the high-strength bolts 101. The hexagonal holes 601 are regular hexagonal holes, and the radius of the hexagonal holes 601 is slightly larger than the outer diameter of the matching nut 102 by 1~2mm. like Figure 5 As shown, the inner circumference of the stamped steel plate 203 is provided with several bolt holes 403. The number and arrangement of bolt holes 403 and bolt holes 402 are the same and are aligned one-to-one in the axial direction of the high-strength bolt 101. Bolt holes 403 are provided with a hexagonal groove 602 around their outer periphery. The hexagonal groove 602 is mainly formed by stamping the stamped steel plate 203 towards the side away from the anchor plate 202 through an expansion method. The outer circumference of the stamped steel plate 203 is provided with several connecting holes 503 for connecting the inner sleeve 201 and the anchor plate 202. The number and arrangement of connecting holes 503 and connecting holes 501 are the same and are aligned one-to-one in the axial direction of the high-strength bolt 101. like Figure 7 and Figure 8 As shown, the sleeve assembly also includes a matching nut 102 and a washer 103. The washer 103 is disposed between the inner sleeve 201 and the anchor plate 202, and the washer 103 is located at the bolt hole 402 of the inner sleeve 201. The matching nut 102 is installed at the hexagonal hole 601 of the anchor plate 202, such that the hexagonal groove 602 of the stamped steel plate 203 covers the surface of the matching nut 102. The thickness of the matching nut 102 is greater than the thickness of the anchor plate 202. The two sides of the matching nut 102 are in contact with the washer 103 and the hexagonal groove 602, respectively. Both the matching nut 102 and the washer 103 have through holes in the middle for inserting high-strength bolts 101.

[0025] The first bolt passes through the connecting hole 503 of the stamped steel plate 203 and the connecting hole 502 of the anchor plate 202 in sequence, and is then threadedly connected to the connecting hole 501 of the inner sleeve 201; the high-strength bolt 101 passes through the bolt hole 401 on the rectangular steel pipe, the bolt hole 402 of the inner sleeve 201, and the washer 103 in sequence, and is then threadedly connected to the matching nut 102.

[0026] The connecting hole 3 503 of the stamped steel plate 203, the connecting hole 2 502 of the anchor plate 202 and the connecting hole 1 501 of the inner sleeve 201 are of the same specifications; the bolt hole 3 403 of the stamped steel plate 203 and the bolt hole of the matching nut 102 are of the same specifications as the bolt hole 2 402 of the inner sleeve 201.

[0027] The external thread of the high-strength bolt 101 matches the internal thread of the matching nut 102.

[0028] The installation method of the bolted connection node of the present invention includes the following steps: The steel structure manufacturer prefabricates the inner sleeve 201, anchor plate 202, stamped steel plate 203, and rectangular steel pipe. The size, quantity, and location of the bolt holes 401 at the ends of the steel pipes are provided by the designer. The inner sleeve 201 has bolt holes 402 of the same specifications as bolt holes 401, and connecting holes 501 for connecting the anchor plate 202 and the stamped steel plate 203. The anchor plate 202 has hexagonal holes 601 on its surface to accommodate the required hexagonal nuts 102, and connecting holes 502 for connecting the inner sleeve 201 and the stamped steel plate 203. The stamped steel plate 203 has hexagonal grooves 602 stamped to fit the hexagonal nuts 102, and bolt holes 403 of the same specifications as bolt holes 401, and connecting holes 503 for connecting the inner sleeve 201 and the anchor plate 202.

[0029] Step S1, as follows Figures 9-11 As shown, first, the inner sleeve 201, the washer 103 and the anchor plate 202 are stacked in sequence, so that the bolt holes 402 in the inner sleeve 201, the washer 103 and the hexagonal holes 601 in the anchor plate 202 correspond one-to-one. The matching nut 102 that matches the high-strength bolt 101 is then embedded into the hexagonal holes 601 of the anchor plate 202. Step S2: Align the hexagonal groove 602 on the stamped steel plate 203 with the embedded matching nut 102, and cover the matching nut 102 with the stamped steel plate 203. Then, use the first bolt to pass through the connecting hole 3 503 of the stamped steel plate 203 and the connecting hole 2 502 of the anchor plate 202 in sequence, and then thread it to the connecting hole 1 501 of the inner sleeve 201, so that the inner sleeve 201, the anchor plate 202 and the stamped steel plate 203 are connected into an integral sleeve assembly. Step S3: Use the inner sleeve 201 to coaxially connect the two rectangular steel pipes into an integrated node.

[0030] Step S3 is as follows: The end of a rectangular steel pipe is fitted onto one side of the inner sleeve 201. Then, a high-strength bolt 101 is passed through the bolt hole 401 on the rectangular steel pipe, the bolt hole 402 on the inner sleeve 201, and the washer 103 in sequence, and then threadedly connected to the matching nut 102 to complete the connection between the rectangular steel pipe and the inner sleeve 201. Next, the end of another rectangular steel pipe is fitted onto the other side of the inner sleeve 201, and the other rectangular steel pipe is connected to the inner sleeve 201 using high-strength bolts 101, thereby connecting the two rectangular steel pipes into an integrated structure through the inner sleeve 201.

[0031] In step S1, the gasket 103 is prevented from slipping during subsequent installation by bonding the gasket 103 or adding magnetism to the gasket 103.

[0032] In practice, the inner sleeve 201, anchor plate 202, and stamped steel plate 203 can be fixed using nail guns, thus eliminating the need for drilling connection holes one, two, and three. Furthermore, when connecting the inner sleeve to the first rectangular steel pipe, if the operating space allows, the high-strength bolts can be passed through bolt hole one, bolt hole two, and the washer in sequence, and the inner sleeve and rectangular steel pipe can be directly connected by tightening the nut. In this case, the dimensions of anchor plate 202 and stamped steel plate 203 can be appropriately reduced, and they are only used when connecting the inner sleeve to the second rectangular steel pipe.

[0033] This embodiment describes a connection at a component node using high-strength hexagonal head bolts, with the inner sleeve 201 connecting the first rectangular steel pipe 301 and the second rectangular steel pipe 302. Normally, after the rectangular steel pipes are spliced ​​with the inner sleeve 201, bolts are needed for fixation. However, under current technological conditions, rectangular steel pipes, being closed-section components, impose significant limitations on operating space, requiring workers to operate only on the outside of the component. Furthermore, traditional bolts cannot be installed on one side only. Using the device and method designed in this invention, before connecting the inner sleeve 201 and the rectangular steel pipes, an anchor plate 202 with nuts matching the high-strength bolts is pre-installed inside the inner sleeve 201. After the inner sleeve 201 is spliced ​​with the two rectangular steel pipes, the high-strength bolts can be directly passed through bolt hole one, bolt hole two, and the washer from the outside of the steel pipes, and finally screwed into the matching nuts 102 fixed on the anchor plate 202, thus completing the connection of the steel pipe node.

[0034] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this invention should not be considered as limited to the specific forms stated in the embodiments. The scope of protection of this invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A bolted connection node suitable for closed-section members, characterized in that: It includes two rectangular steel pipes, a sleeve assembly, and a high-strength bolt (101); the two rectangular steel pipes are coaxially arranged and connected to form an integral structure through the sleeve assembly. The inner contour of the rectangular steel pipe is adapted to the outer contour of the sleeve assembly. Several bolt holes (401) are opened at the end of the wall plate of the rectangular steel pipe. Several bolt holes are opened on the wall plate of the sleeve assembly. The high-strength bolt (101) passes through the bolt holes (401) on the rectangular steel pipe and is connected and fixed to the matching nut (102) on the sleeve assembly, so that the rectangular steel pipe is coaxially sleeved on the outside of the sleeve assembly. The sleeve assembly is mainly composed of an inner sleeve (201), an anchor plate (202), and a stamped steel plate (203) connected in sequence. The inner sleeve (201) has a bolt hole 2 (402) on one side for inserting a high-strength bolt (101). The bolt hole 2 (402) and the bolt hole 1 (401) have the same specifications. The outer periphery of the inner sleeve (201) wall plate has a connecting hole 1 (501) for connecting the anchor plate (202) and the stamped steel plate (203). The inner wall of the connecting hole 1 (501) has an internal thread that matches the first bolt. The inner circumference of the anchor plate (202) is provided with a number of hexagonal holes (601). The number and arrangement of the hexagonal holes (601) and bolt holes (402) are the same and aligned. The outer circumference of the anchor plate (202) is provided with a number of connecting holes (502) for connecting the inner sleeve (201) and the stamped steel plate (203). The number and arrangement of the connecting holes (502) and connecting holes (501) are the same and aligned. The inner circumference of the stamped steel plate (203) is provided with a number of bolt holes 3 (403). The number and arrangement of bolt holes 3 (403) and bolt holes 2 (402) are the same and aligned. Bolt holes 3 (403) are provided with a hexagonal groove (602) around their outer periphery. The hexagonal groove (602) is mainly formed by stamping the stamped steel plate (203) in the direction away from the anchor plate (202). The outer circumference of the stamped steel plate (203) is provided with a number of connecting holes 3 (503) for connecting the inner sleeve (201) and the anchor plate (202). The number and arrangement of connecting holes 3 (503) and connecting holes 1 (501) are the same and aligned. The first bolt passes through the connecting hole three (503) of the stamped steel plate (203) and the connecting hole two (502) of the anchor plate (202) in sequence, and is then threadedly connected to the connecting hole one (501) of the inner sleeve (201); the high-strength bolt (101) passes through the bolt hole one (401) on the rectangular steel pipe and the bolt hole two (402) of the inner sleeve (201) in sequence, and is then threadedly connected to the matching nut (102).

2. A bolted connection node suitable for closed-section members according to claim 1, characterized in that: The sleeve assembly also includes a matching nut (102) and a washer (103). The washer (103) is disposed between the inner sleeve (201) and the anchor plate (202), and the washer (103) is located at the bolt hole 2 (402) of the inner sleeve (201). The matching nut (102) is installed at the hexagonal hole (601) of the anchor plate (202), and the hexagonal groove (602) of the stamped steel plate (203) covers the surface of the matching nut (102). Both the nut (102) and the washer (103) have through holes in the middle for inserting high-strength bolts (101).

3. A bolted connection node suitable for closed-section members according to claim 1, characterized in that: The connection hole 3 (503) of the stamped steel plate (203), the connection hole 2 (502) of the anchor plate (202) are consistent with the connection hole 1 (501) of the inner sleeve (201); the bolt hole 3 (403) of the stamped steel plate (203) and the bolt hole of the matching nut (102) are consistent with the bolt hole 2 (402) of the inner sleeve (201).

4. A bolted connection node suitable for closed-section members according to claim 1, characterized in that: The external thread of the high-strength bolt (101) matches the internal thread of the matching nut (102).

5. A method for installing a bolted connection node as described in claim 2, characterized in that, Includes the following steps: Step S1: First, stack the inner sleeve (201), the washer (103) and the anchor plate (202) in sequence, so that the bolt hole 2 (402) in the inner sleeve (201), the washer (103) and the hexagonal hole (601) in the anchor plate (202) correspond one by one. Then, insert the matching nut (102) that matches the high-strength bolt (101) into the hexagonal hole (601) of the anchor plate (202). Step S2: Align the hexagonal groove (602) on the stamped steel plate (203) with the embedded matching nut (102), and cover the matching nut (102) with the stamped steel plate (203). Then, use the first bolt to pass through the connecting hole three (503) of the stamped steel plate (203) and the connecting hole two (502) of the anchor plate (202) in sequence, and then thread it to the connecting hole one (501) of the inner sleeve (201), so that the inner sleeve (201), the anchor plate (202) and the stamped steel plate (203) are connected into an integral sleeve assembly. Step S3: Use the inner sleeve (201) to coaxially connect the two rectangular steel pipes into an integrated node.

6. The installation method of a bolted connection node according to claim 5, characterized in that: Step S3 specifically involves: The end of a rectangular steel pipe is fitted onto one side of the inner sleeve (201). Then, a high-strength bolt (101) is passed through the bolt hole 1 (401) on the rectangular steel pipe, the bolt hole 2 (402) of the inner sleeve (201), and the washer (103) in sequence, and then threadedly connected to the matching nut (102) to complete the connection between the rectangular steel pipe and the inner sleeve (201). Next, the end of another rectangular steel pipe is fitted onto the other side of the inner sleeve (201), and the other rectangular steel pipe is connected to the inner sleeve (201) using a high-strength bolt (101), thereby connecting the two rectangular steel pipes into an integrated structure through the inner sleeve (201).

7. The installation method of a bolted connection node according to claim 5, characterized in that: In step S1, the gasket (103) is prevented from slipping during subsequent installation by bonding the gasket (103) or by adding magnetism to the gasket (103).

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