Self-locking and self-resetting joint for modular steel structure and connecting method

Abstract

The invention relates to a self-locking and self-resetting node for a modular steel structure and a connecting method, and belongs to the technical field of steel structure node connection, the self-locking and self-resetting node comprises an upper module column and a lower module column, the node comprises an upper column sealing plate and a lower column sealing plate which are mounted at the ends of the upper module column and the lower module column, a shear key with a rotary clamping block and an inner welding plate, in the connecting process, the upper module column descends to the lower module column, the shear key and the rotary clamping block penetrate through the upper column sealing plate, the insertion block pushes the rotary clamping block till the rotary clamping block makes contact with the limiting block, self-locking connection is formed, and after node connection, the upper module column is connected with the lower module column. A gap is reserved between the rotary clamping block and the upper column sealing plate, and the upper module column is allowed to swing under the earthquake effect and reset through the prestressed steel strand. The problem that the column section is weakened in existing modular steel structure joint connection is solved, and the joint design capable of achieving self-resetting after an earthquake is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure node connection, and in particular to a self-locking and self-resetting node for a modular steel structure and a connection method. Background Art

[0002] The connection between modular steel structures is very important for the safety and stability of the entire structure. At present, the nodes and connection methods of modular steel structures mainly include external column connection and internal column connection. External column connection often requires a large number of bolts, which not only affects the installation efficiency, but also affects indoor and outdoor decoration. Internal column connection can avoid the problem of affecting indoor and outdoor decoration, but most connection methods require opening holes in the side walls of the column, which weakens the column section and affects the mechanical properties of the node. In addition, the existing modular steel structure nodes are almost all designed according to the traditional earthquake resistance concept. Buildings built with traditional earthquake resistance concepts are extremely expensive or even difficult to repair after a major earthquake, which not only affects life safety, but also causes a lot of economic losses. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a self-locking and self-resetting node and connection method for modular steel structures, which can self-lock at the node and reset the structure after an earthquake without weakening the side walls of the columns, and is easy to install.

[0004] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a self-locking and self-resetting node for a modular steel structure. The modular steel structure comprises an upper module column and a lower module column, wherein an upper reserved perforation is provided in the upper module column, and a lower reserved perforation corresponding to the upper reserved perforation is provided in the lower module column, and a prestressed steel strand is passed through the upper reserved perforation and the corresponding lower reserved perforation, and the prestressed steel strand is anchored by an anchor, and an upper anchor plate is installed at the upper end of the upper module column, and a lower anchor plate is installed at the lower end of the lower module column, and the self-locking and self-resetting node comprises: A lower column sealing plate is installed at the upper end of the lower module column; A shear key is installed on the lower column cover plate, a first slot is reserved in the center along the longitudinal direction, and a plurality of holes are arranged on the side of the shear key, the holes are respectively provided with rotating shafts, and corresponding to the rotating shafts, rotating blocks rotating around the rotating shafts are respectively provided; An upper column sealing plate is installed at the lower end of the upper module column, and the upper column sealing plate is provided with a second slot for the shear key to pass through; and An inner welding plate is arranged inside the upper module column near one end of the upper column sealing plate, and an insertion block and a limit block are connected to the inner welding plate. The insertion block is arranged corresponding to the first slot and is used to push the rotating block to rotate along the rotating shaft. The limit block is arranged corresponding to the rotating block and is used to limit the rotating block. After the self-locking and self-resetting nodes are connected, a gap is left between the rotating block and the upper column sealing plate to allow the upper module column to swing within the range defined by the gap.

[0005] Furthermore, a connecting plate is provided between the upper column sealing plate and the lower column sealing plate, and a connecting hole is provided at each corner of the connecting plate. The connecting hole is arranged corresponding to the upper reserved perforation and the lower reserved perforation for the prestressed steel strand to pass through.

[0006] Furthermore, the connecting plate is provided with a third slot along the longitudinal direction for the shear key to pass through.

[0007] Furthermore, the cross-section of the upper module column and the cross-section of the lower module column are circular or square, and the shape of the inner welding plate matches the shape of the cross-section of the upper module column.

[0008] Furthermore, there are multiple limit blocks, and the multiple limit blocks are evenly arranged around the insertion block and symmetrically along the center of the insertion block.

[0009] Furthermore, the limiting block is an annular limiting piece coaxially arranged outside the insertion block.

[0010] In a second aspect, the present invention further provides a method for connecting a self-locking and self-resetting node for a modular steel structure based on the first aspect, comprising the following steps: S1. Pre-assemble the upper module column and the lower module column in the factory, install the insert block and the limit block on the inner welding plate, and then install the inner welding plate on the designated position of the upper module column; S2, positioning the lower module column on site and placing the connecting plate; S3, hoist the upper module column and lower it until the upper column cover plate contacts the connecting plate, the shear key and the rotating block pass through the second slot of the upper column cover plate and enter the upper module column, and the insertion block pushes the rotating block until the rotating block contacts the limit block to form a self-locking connection; S4. Pass the prestressed steel strand through the entirety of the upper module column and the lower module column, and anchor them with the anchor.

[0011] Furthermore, step S1 specifically includes: Install the insert block and the limit block onto the inner welding plate, and then install the inner welding plate onto the designated position of the upper module column; Leave a hole in the shear key to place the rotating shaft and the rotating block, insert the rotating block into the rotating shaft, and then install the rotating shaft on the shear key; install the shear key on the lower column cover plate; Install the upper anchor plate and the upper column sealing plate at both ends of the upper module column, and install the lower anchor plate and the lower column sealing plate at both ends of the lower module column.

[0012] Furthermore, step S2 specifically includes: When the shear key passes through the upper column cover plate, the insertion block in the upper module column contacts the rotating block in the lower module column and pushes the rotating block around the rotating shaft; When the lower surface of the upper column sealing plate contacts the upper surface of the connecting plate, the rotating block contacts the limit block in the upper module column, and the insertion block contacts and squeezes the other side of the rotating block, thereby limiting the rotating block to the specified position. At the same time, the rotating block extends the shear key and leaves a gap with the upper column sealing plate, completing the self-locking process of the connection.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges a shear key with a rotating block to cooperate with an insertion block and a limit block on the inner welding plate. The contact between the limit block and the insertion block and the rotating block ensures the precise positioning of the rotating block. The self-locking connection of the modular steel structure node can be achieved without opening a hole in the side wall of the column, and at the same time, the mechanical performance of the column section is not weakened due to the opening.

[0014] The present invention reserves a space between the rotating block and the upper column cover plate so that the upper module column can swing left and right when encountering an earthquake, so that the steel structure will not be damaged by tension due to an overly strong connection; after the module column swings, it can be reset under the action of the prestressed steel strands, reducing residual deformation, and can be put into normal use again without repair or with only simple repair, thereby improving the seismic performance of the modular steel structure and reducing the cost of repair after an earthquake.

[0015] The present invention provides a connection plate and opens a connection hole, which further ensures accurate passage of the prestressed steel strands. A third slot is reserved in the connection plate for the shear key to pass through, which enhances the accuracy and reliability of the connection.

[0016] The cross-sections of the upper module column and the lower module column of the present invention can be circular or square, and the shape of the inner welding plate matches the column cross-section to adapt to different cross-sectional shapes. When the limit block is single, a continuous annular cross-sectional structure can be adopted. The diversity of cross-sections provides a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 An overall schematic diagram of a modular steel structure self-locking and self-resetting node after connection is completed provided by an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the anchorage end of the prestressed steel strand at position B in the self-locking and self-resetting node of the modular steel structure shown; Figure 3 for Figure 1 The schematic diagram of the internal structure of the modular steel structure self-locking and self-resetting node after removing the upper module column and the lower module column at position A; Figure 4 It is a schematic diagram of the position of the hole and the rotating shaft in the shear key of the present invention; Figure 5 It is a schematic diagram of a rotating block in the shear key of the present invention; Figure 6 This is a schematic diagram of the initial state of the shear key of the present invention before connection; Figure 7 This is a schematic diagram of the state of the shear key of the present invention after the connection is completed; Figure 8 This is a schematic diagram of the inner welding plate of the present invention; Fig. 9 This is a cross-sectional schematic diagram of the modular steel structure self-locking and self-resetting node connection after completion.

[0019] Reference numerals: 1. Upper module column; 2. Lower module column; 3. Connecting plate; 4. Prestressed steel strand; 5. Anchor; 6. Internal welding plate; 601. Insert block; 602. Limit block; 8. Shear key; 101. Upper anchor plate; 102. Upper column sealing plate; 201. Lower anchor plate; 202. Lower column sealing plate; 801. Rotating block; 802. Rotating shaft. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in this article.

[0024] For the purpose of this specification and the appended claims, unless otherwise stated, all numbers expressing amounts, percentages or ratios and other numerical values ​​used in this specification and the appended claims are understood to be modified in all cases by the term "about". In addition, all ranges disclosed herein are inclusive and independently combinable. Example 1

[0025] This embodiment provides a self-locking and self-resetting node for a modular steel structure. The modular steel structure has an upper module column 1 and a lower module column 2. Figure 1 As shown, the upper module column 1 is provided with an upper reserved perforation, and the lower module column 2 is provided with a lower reserved perforation corresponding to the upper reserved perforation. The sides of the upper module column 1 and the lower module column 2 are not opened, so the mechanical properties of the column section are retained. A prestressed steel strand 4 is inserted between the upper reserved perforation and the corresponding lower reserved perforation. Figure 1 and Figure 2As shown, the prestressed steel strand 4 is anchored by the anchor 5, and the upper end of the upper module column 1 is installed with an upper anchor plate 101, and the lower end of the lower module column 2 is installed with a lower anchor plate 201. If it is a multi-layer modular steel structure, it is only necessary to anchor at the bottom end of the bottom module column and the top end of the top module column.

[0026] like Figure 3 As shown, the self-locking and self-resetting node can generally include a lower column sealing plate 202, a shear key 8, an upper column sealing plate 102, and an inner welding plate 6. The lower column sealing plate 202 is installed at the upper end of the lower module column 2 to fix the shear key 8. The shear key 8 is installed on the lower column sealing plate 202, and the center position of the shear key 8 is reserved with a first slot in the longitudinal direction, and as shown in FIG. Figure 4 As shown, the side of the shear key 8 is arranged with a plurality of holes, the number of the holes is 2 to 4, and the holes are respectively provided with a rotating shaft 802, and as shown in FIG. Figure 5 As shown, the corresponding rotating shafts 802 are respectively provided with rotating blocks 801 rotating around the rotating shafts 802, and the rotating blocks 801 can rotate around the rotating shafts 802 within a limited range, such as Figure 4 As shown, the size of the rotating shaft 802 is adapted to the hole opened on the rotating block 801. The upper column sealing plate 102 is installed at the lower end of the upper module column 1, and the upper column sealing plate 102 is provided with a second slot for the shear key 8 to pass through. Figure 8 As shown, an inner welding plate 6 is arranged inside the upper module column 1 near one end of the upper column sealing plate 102, and an insertion block 601 and a limit block 602 are connected to the inner welding plate 6. The insertion block 601 is arranged corresponding to the first slot, and is used to push the rotating block 801 to rotate along the rotating shaft 802, and the limit block 602 is used to limit the rotating block 801.

[0027] The initial state of the rotating block 801 under the action of gravity is as follows: Figure 6 As shown, the rotating block 801 can rotate freely around the rotating shaft 802. Therefore, when the shear key 8 passes through the upper column sealing plate 102, the rotating block 801 can be pushed into the shear key 8 by the upper column sealing plate 102, so that it can pass through the upper column sealing plate 102. After the rotating block 801 passes through the upper column sealing plate 102, it is pushed to the outside of the shear key 8 under the action of the insertion block 601 until both sides are in contact with the insertion block 601 and the limit block 602 at the same time. Figure 7 Final state shown.

[0028] Specifically, Fig. 9 As shown, after the self-locking and self-resetting node connection is completed, the limiting block 602 and the inserting block 601 are respectively in contact with two side surfaces of the rotating block 801 to limit the rotating block 801 .

[0029] Furthermore, if Fig. 9As shown, after the self-locking and self-resetting node is connected, a gap is left between the rotating block 801 and the upper column sealing plate 102 to allow the upper module column 1 to swing within the range limited by the gap. Under the action of an earthquake, since there is a gap reserved between the rotating block 801 and the upper column sealing plate 102, the upper module column 1 will swing left and right, and the self-locking and self-resetting node will not be damaged by tension due to excessive connection. After the module column swings, it will reset under the action of the prestressed steel strand 4. For example, if the upper module column 1 swings to the right, the left side will lift up. At this time, the tension in the left prestressed steel strand 4 is relatively large. Under the tension of the prestressed steel strand 4, the left side of the upper module column 1 falls again, completing the reset process and reducing the residual deformation of the steel structure.

[0030] Specifically, Figure 3 As shown, a connecting plate 3 is also provided between the upper column sealing plate 102 and the lower column sealing plate 202, and each corner of the connecting plate 3 is provided with a connecting hole, and the connecting hole is provided corresponding to the upper reserved perforation and the lower reserved perforation for the prestressed steel strand 4 to pass through. Furthermore, the connecting plate 3 is also provided with a third slot along the longitudinal direction for the shear key 8 to pass through.

[0031] Preferably, the cross-section of the upper module column 1 and the cross-section of the lower module column 2 are circular or square, and the shape of the inner welding plate 6 matches the shape of the cross-section of the upper module column 1 .

[0032] Preferably, there are multiple limit blocks 602 , and the multiple limit blocks 602 are evenly arranged around the insertion block 601 and symmetrically along the center of the insertion block 601 .

[0033] Preferably, the limiting block 602 is an annular limiting member coaxially arranged outside the insertion block 601 .

[0034] The present invention realizes the self-locking connection of the modular steel structure nodes, is easy and quick to install, has good seismic resistance, and is helpful to promote the use of modular steel structures in earthquake zones. Example 2

[0035] This embodiment provides a connection method for a self-locking and self-resetting node of a modular steel structure, specifically comprising: S1. Pre-assemble the upper module column 1 and the lower module column 2 in the factory, install the insert block 601 and the limit block 602 on the inner welding plate 6, and then install the inner welding plate 6 on the designated position of the upper module column 1; S2, positioning the lower module column 2 on site and placing the connecting plate 3; S3, hoist the upper module column 1 and lower it until the upper column cover plate 102 contacts the connecting plate 3, the shear key 8 and the rotating block 801 pass through the second slot of the upper column cover plate 102 and enter the upper module column 1, and the insertion block 601 pushes the rotating block 801 until the rotating block 801 contacts the limit block 602, forming a self-locking connection; S4. Pass the prestressed steel strand 4 through the entirety of the upper module column 1 and the lower module column 2, and anchor them with an anchor 5.

[0036] Specifically, step S1 includes: Install the insert block 601 and the limit block 602 onto the inner welding plate 6, and then install the inner welding plate 6 at the designated position of the upper module column 1; A hole is reserved in the shear key 8 for placing the rotating shaft 802 and the rotating block 801. After the rotating block 801 is inserted into the rotating shaft 802, the rotating shaft 802 is installed on the shear key 8; the shear key 8 is installed on the lower column sealing plate 202; An upper anchoring plate 101 and an upper column sealing plate 102 are respectively installed at both ends of the upper module column 1, and a lower anchoring plate 201 and a lower column sealing plate 202 are respectively installed at both ends of the lower module column 2.

[0037] Specifically, step S2 specifically includes: After the shear key 8 passes through the upper column cover plate 102, the insertion block 601 in the upper module column 1 contacts the rotation block 801 in the lower module column 2 and pushes the rotation block 801 around the rotation axis 802; When the lower surface of the upper column sealing plate 102 contacts the upper surface of the connecting plate 3, the rotating block 801 contacts the limit block 602 in the upper module column 1, and the insertion block 601 contacts and squeezes the other side of the rotating block 801, thereby limiting the rotating block 801 to the specified position. At the same time, the rotating block 801 extends out of the shear key 8 and leaves a gap with the upper column sealing plate 102, completing the self-locking process of the connection.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A self-locking and self-resetting node for a modular steel structure, the modular steel structure comprising an upper modular column (1) and a lower modular column (2), characterized in that: An upper reserved through-hole is provided in the upper module column (1), and a lower reserved through-hole corresponding to the upper reserved through-hole is provided in the lower module column (2), a prestressed steel strand (4) is passed through the upper reserved through-hole and the corresponding lower reserved through-hole, the prestressed steel strand (4) is anchored by an anchor (5), an upper anchoring plate (101) is installed at the upper end of the upper module column (1), and a lower anchoring plate (201) is installed at the lower end of the lower module column (2), and the self-locking and self-resetting node comprises: A lower column sealing plate (202) installed on the upper end of the lower module column (2); A shear key (8) is mounted on the lower column sealing plate (202), a first slot being reserved at the center thereof in the longitudinal direction, and a plurality of holes are arranged on the side of the shear key (8), the holes are respectively provided with rotating shafts (802), and corresponding to the rotating shafts (802), rotating blocks (801) rotating around the rotating shafts (802) are respectively provided; An upper column sealing plate (102) is installed at the lower end of the upper module column (1), and the upper column sealing plate (102) is provided with a second slot for the shear key (8) to pass through; and an inner welding plate (6) arranged inside the upper module column (1) near one end of the upper column sealing plate (102); an insertion block (601) and a limit block (602) are connected to the inner welding plate (6); the insertion block (601) is arranged corresponding to the first slot and is used to push the rotating block (801) to rotate along the rotating shaft (802); the limit block (602) is arranged corresponding to the rotating block (801) and is used to limit the rotating block (801); After the self-locking and self-resetting node connection is completed, a gap is left between the rotating block (801) and the upper column sealing plate (102) to allow the upper module column (1) to swing within the range defined by the gap.

2. The self-locking and self-resetting node for modular steel structure according to claim 1, characterized in that: A connecting plate (3) is provided between the upper column sealing plate (102) and the lower column sealing plate (202), and each corner of the connecting plate (3) is provided with a connecting hole, and the connecting hole is provided corresponding to the upper reserved through hole and the lower reserved through hole for the prestressed steel strand (4) to pass through.

3. The self-locking and self-resetting node for modular steel structure according to claim 2, characterized in that: The connecting plate (3) is provided with a third slot in the longitudinal direction for the shear key (8) to pass through.

4. The self-locking and self-resetting node for modular steel structure according to claim 1, characterized in that: The cross-section of the upper module column (1) and the cross-section of the lower module column (2) are circular or square, and the shape of the inner welding plate (6) matches the shape of the cross-section of the upper module column (1).

5. The self-locking and self-resetting node for modular steel structure according to claim 1, characterized in that: There are a plurality of the limit blocks (602), and the plurality of limit blocks (602) are evenly arranged around the insertion block (601) and symmetrically along the center of the insertion block (601).

6. The self-locking and self-resetting node for modular steel structure according to claim 1, characterized in that: The limiting block (602) is an annular limiting piece coaxially arranged outside the insertion block (601).

7. The self-locking and self-resetting node for modular steel structure according to claim 1, characterized in that: After the self-locking and self-resetting node is connected, the limiting block (602) and the inserting block (601) are respectively in contact with two side surfaces of the rotating block (801) to limit the rotating block (801).

8. A connection method for a self-locking and self-resetting node for a modular steel structure based on claim 2 or 3, characterized in that: The following steps are involved: S1. Pre-assemble the upper module column (1) and the lower module column (2) in a factory, install the insertion block (601) and the limit block (602) on the inner welding plate (6), and then install the inner welding plate (6) at a designated position of the upper module column (1); S2, positioning the lower module column (2) on site and placing the connecting plate (3); S3, hoisting the upper module column (1) and lowering it until the upper column cover plate (102) contacts the connecting plate (3), the shear key (8) and the rotating block (801) pass through the second slot of the upper column cover plate (102) and enter the upper module column (1), and the insertion block (601) pushes the rotating block (801) until the rotating block (801) contacts the limit block (602), thereby forming a self-locking connection; S4. Pass the prestressed steel strand (4) through the entirety of the upper module column (1) and the lower module column (2), and anchor them using the anchor (5).

9. The method for connecting self-locking and self-resetting nodes for modular steel structures according to claim 8, characterized in that: Step S1 specifically includes: Installing the insertion block (601) and the limiting block (602) onto the inner welding plate (6), and then installing the inner welding plate (6) at a designated position of the upper module column (1); A hole is reserved in the anti-shear key (8) for accommodating the rotating shaft (802) and the rotating block (801); the rotating block (801) is inserted into the rotating shaft (802), and then the rotating shaft (802) is installed on the anti-shear key (8); the anti-shear key (8) is installed on the lower column sealing plate (202); The upper anchoring plate (101) and the upper column sealing plate (102) are respectively installed at both ends of the upper module column (1), and the lower anchoring plate (201) and the lower column sealing plate (202) are respectively installed at both ends of the lower module column (2).

10. The connection method of the self-locking and self-resetting nodes for modular steel structures according to claim 8, characterized in that: Step S2 specifically includes: When the anti-shear key (8) passes through the upper column cover plate (102), the insertion block (601) in the upper module column (1) contacts the rotation block (801) in the lower module column (2) and pushes the rotation block (801) around the rotation axis (802); When the lower surface of the upper column sealing plate (102) contacts the upper surface of the connecting plate (3), the rotating block (801) contacts the limiting block (602) in the upper module column (1), and the insertion block (601) contacts and squeezes the other side of the rotating block (801), thereby limiting the rotating block (801). At the same time, the rotating block (801) extends out of the shear key (8) and leaves a gap with the upper column sealing plate (102), completing the self-locking process of the connection.

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