An assembly joint and construction method for a steel sleeve type square steel tube column and an I-shaped steel beam

Abstract

The present invention discloses an assembly joint and construction method for a steel sleeve type square steel tube column and an I-shaped steel beam. The assembly joint of the present invention mainly includes a steel sleeve, which is connected to the I-shaped steel beam through its four side surfaces and to the square steel tube column through its upper and lower surfaces; a reverse L-shaped steel end connector and its cover plate are respectively provided on the four side surfaces of the steel sleeve. Several bolt holes are provided on the two upper side ears of the reverse L-shaped steel end connector, and several bolt holes are also provided on its cover plate; convex wedge-shaped connectors are respectively provided on the four sides of the upper and lower surfaces of the steel sleeve, and bolt holes are respectively provided at the four corners. Corresponding prefabricated wedge-shaped grooves are also provided inside the four sides of the end of the square steel tube column, and corresponding bolt holes are also provided at the four corners of the end of the square steel tube column. The steel sleeve and the square steel tube column are aligned and connected through the convex wedge-shaped connector and the prefabricated wedge-shaped groove, and the square steel tube column is lapped on the reverse L-shaped steel end connector to complete the connection between the steel sleeve and the square steel tube column and between the square steel tube columns.

Description

Technical Field

[0001] The invention belongs to the technical field of building steel structure connection nodes, and particularly relates to an assembly node and a construction method of a steel sleeve type square steel pipe column and an I-shaped steel beam with wedge-shaped connecting pieces. Background Art

[0002] Prefabricated steel structures have become a hot development direction in the construction industry due to their advantages such as light self-weight, high strength, short construction period, recyclability of steel, and less pollution. Nodes are the key points and difficulties in the design and construction of prefabricated steel structures, and their design methods and splicing processes directly determine the industrialization degree and structural form of the structure. Square steel pipe columns are the main vertical load-bearing members often used in steel structures, and I-shaped steel is also the most commonly used horizontal load-bearing member. Due to the differences in the cross-sectional forms of the two members, their connection forms in the structure are mainly divided into: welded connection, bolt-welded connection, and bolt connection arranged inside the square steel pipe column. The prefabricated node connections using welding technology are complex in on-site construction, have poor versatility, uneven quality, and it is difficult to produce standardized products. Welding cracks are prone to cause structural fatigue failure and cannot meet the requirements of industrial development; for the prefabricated connection with bolts arranged inside the square steel pipe, since it is necessary to open holes in the square steel pipe, it weakens the cross-sectional area of the pressure-bearing member, and problems such as stress concentration and local buckling are likely to occur during the structural load-bearing process. The new type of sleeve-type square steel pipe column and H-shaped steel beam prefabricated node and its construction method disclosed in the Chinese invention patent application with the patent application number 201711223047.4 adopt an H-shaped sleeve and a support steel plate, and the H-shaped sleeve is connected to the square sleeve by welding; the production and manufacture of the H-shaped sleeve are complex, it is difficult to align during connection, the welding area of the H-shaped sleeve is small, and it is supported by a support steel plate with limited strength. Moreover, in the prior art, there are problems such as complex connection node structures, high construction accuracy requirements, and long high-altitude welding operation time for workers.

[0003] Therefore, it is necessary to design an assembly node of a square steel pipe column and an I-shaped steel beam with large stiffness, good integrity, simple connection, and strong versatility, so as to improve the prefabrication ability of steel structures and provide technical support for the industrialization of steel structure buildings using such components. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an assembly node of a steel sleeve type square steel pipe column and an I-shaped steel beam with reasonable structure, convenient construction, and stable performance in view of the above-mentioned defects existing in the prior art. It can solve the problem of coordinating and unifying between ensuring the overall stiffness of the node and ensuring the fast construction of the fully prefabricated type, as well as the problems that the node is affected by factors such as the flatness and angle of prefabricated components, the steel structure still needs to adjust the angle of prefabricated components, can only be specially designed and manufactured, has poor versatility, and is not easy to achieve standardization, so as to increase the applicability and versatility of the node.

[0005] The above object of the present invention is achieved by the following technical solutions: The assembled joint of the steel sleeve type square tube steel column and the I-shaped steel beam includes a steel sleeve. The main body of the steel sleeve is a square tube member, which is connected to the I-shaped steel beam through its four side faces and to the square tube steel column through its upper and lower faces; a reversed L-shaped steel end connector and its cover plate are respectively provided on the four side faces of the steel sleeve. Several bolt holes with screw threads for bolts are provided on the two upper side lugs of the reversed L-shaped steel end connector, and corresponding bolt holes are also provided on the two sides of its cover plate. The I-shaped steel beam is placed inside the reversed L-shaped steel end connector, and the I-shaped steel beam is pressed tightly by tightening the high-strength bolts in the bolt holes of the cover plate and the reversed L-shaped steel end connector to complete the lapping of the I-shaped steel beam and the steel sleeve; convex wedge-shaped connectors are respectively provided on the four sides of the upper and lower faces of the steel sleeve, and bolt holes with screw threads for bolts are respectively provided at the four corners. Precast wedge-shaped grooves matching the convex wedge-shaped connectors are provided at the corresponding positions on the four sides inside the end of the square tube steel column. Bolt holes are provided at the corresponding positions of the four corners of the end of the square tube steel column and the four corners of the upper and lower faces of the steel sleeve, and slot holes are opened at the four corners of the square tube steel column above the bolt holes. The convex wedge-shaped connectors on the steel sleeve are inserted into the precast wedge-shaped grooves at the end of the square tube steel column, and the bearing-type high-strength screw rods are screwed into the bolt holes on the steel sleeve and the square tube steel column, and the nuts are screwed onto the upper parts of the bearing-type high-strength screw rods through the slot holes at the four corners of the square tube steel column to complete the connection between the steel sleeve and the square tube steel column.

[0006] Furthermore, a stiffening rib is provided at the connection between the bottom of the reversed L-shaped steel end connector and the side face of the main body of the steel sleeve.

[0007] Furthermore, both ends of the I-shaped steel beam are closed, and stiffening ribs are provided on the inner side of the cross-section of the I-shaped steel beam near the beam end, and the distance from the beam end is the transverse elongation length of the reversed L-shaped steel end connector in the steel sleeve; the transverse elongation length of the reversed L-shaped steel end connector is 2 times the height of the I-shaped steel beam.

[0008] Specifically, the cross-sectional dimensions of the main body of the steel sleeve are the same as those of the square tube steel column; the inner cross-sectional dimensions of the reversed L-shaped steel end connector are similar to the cross-sectional dimensions of the I-shaped steel beam.

[0009] Specifically, the thickness of the two upper side lugs of the reversed L-shaped steel end connector is 20 mm.

[0010] Specifically, the surface of the cover plate connected to the I-shaped steel beam is a high-strength friction surface.

[0011] The second object of the present invention is to provide a construction method for the above-mentioned assembled joint of the steel sleeve type square tube steel column and the I-shaped steel beam, which includes the following steps:

[0012] (1) Prefabricate square tube steel columns, I-shaped steel beams, steel sleeves and cover plates in the factory according to the design requirements; among them, the steel sleeve is integrally cast from steel, and it includes convex wedge-shaped connectors, inverted L-shaped steel end connectors, bolt holes with screw threads on the screw and stiffeners. The bolt holes with screw threads on the screw are formed by turning on a lathe; prefabricate wedge-shaped grooves on the inner side of the ends of the square tube steel columns and reserve bolt holes at the four right angles; the cover plate is made of steel plate and bolt holes are reserved on it; the I-shaped steel beam is closed at both ends, and stiffeners are prefabricated on the inner side of the I-shaped steel beam section near the beam end, and the distance from the beam end is the transverse elongation length of the inverted L-shaped steel end connector in the steel sleeve. The transverse elongation length of the inverted L-shaped steel end connector is 2 times the height of the I-shaped steel beam;

[0013] (2) Install bearing-type high-strength screws into the bolt holes with screw threads on the steel sleeve;

[0014] (3) Align and connect the steel sleeve and the square tube steel column through the convex wedge-shaped connector and the prefabricated wedge-shaped groove, adjust the height of the bearing-type high-strength screw up and down, so that the bearing-type high-strength screw passes through the bolt hole in the square tube steel column, and tighten the nut to complete the connection between the steel sleeve and the square tube steel column;

[0015] (4) Lap the I-shaped steel beam on the inverted L-shaped steel end connector;

[0016] (5) Place the cover plate on the inverted L-shaped steel end connector, the friction surface of the cover plate contacts the I-shaped steel beam, align the bolt holes, and connect the cover plate and the inverted L-shaped steel end connector with high-strength bolts to complete the lap between the steel sleeve and the I-shaped steel beam.

[0017] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0018] (1) First of all, compared with the existing all-bolt joints, for the assembled joints of the steel sleeve, square tube steel column and I-shaped steel beam of the present invention, the upper and lower connectors first connect the column and the I-shaped beam through wedge connection and lapping methods to ensure that the center line of the steel sleeve coincides with the center lines of the column and beam components, and avoid the occurrence of initial eccentricity during the assembly process. For the structure after assembly, the bending moment and shear force of the beam section are transmitted to the inverted L-shaped sleeve of the steel sleeve, and the design of the high-strength friction surface on the cover plate enables the joint to have a certain rotational stiffness under the failure load, realizing the semi-rigid force-bearing of the structure.

[0019] (2) Secondly, compared with the existing assembled connection joints with bolts arranged inside the steel pipe, the present invention only opens holes vertically on the steel sleeve and increases the effective area inside the holes, which can ensure that the overall stiffness of the column is not damaged and avoid performance problems such as stress concentration and local buckling caused by bolt holes.

[0020] (3) Then, compared with the assembled connection nodes of the full-welding process, the steel sleeve of the present invention is integrally cast, there is no welding requirement during the structural assembly process, and fatigue failure of the connecting piece caused by welding during the structural stress process is avoided; it has the characteristics of low construction difficulty, easier control of construction quality, and fast assembly.

[0021] (4) Finally, since the steel sleeve in the present invention has the same cross-sectional dimensions as the square tube steel column and uses a wedge-shaped connecting piece inside the square tube steel column for vertical connection, the aesthetics of the structure after assembly is improved, the requirements for component processing and construction accuracy are reduced, and the versatility and construction efficiency of the connection node are improved.

[0022] The present invention solves the problems in the prior art such as complex connection node structure, high construction accuracy requirements, and long high-altitude welding operation time for workers. All components of the present invention can be prefabricated in the factory and are convenient for on-site assembly, and can be widely applied to the connection between square tube steel columns and I-shaped steel beams in steel structures. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the connection structure of the assembled node of the steel sleeve type square tube steel column and the I-shaped steel beam in the embodiment of the present invention.

[0024] Figure 2 is Figure 1 a three-dimensional structure diagram of the steel sleeve in

[0025] Figure 3 is Figure 2 the top view of

[0026] Figure 4 is Figure 2 the bottom view of

[0027] Figure 5 is Figure 2 the side view of

[0028] Figure 6 is Figure 1 a three-dimensional structure diagram of the square tube steel column in

[0029] Figure 7 is Figure 6 the side view of

[0030] Figure 8 is Figure 1 a three-dimensional structure diagram of the I-shaped steel beam in Detailed Embodiments

[0031] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0032] See Figures 1 to 8, the assembled joint of the steel sleeve type square tube steel column and the I-shaped steel beam in this embodiment includes a steel sleeve 3. The main body of the steel sleeve 3 is a square tube member, which is connected to the I-shaped steel beam 2 through its front, rear, left, and right four side surfaces, and is connected to the square tube steel column 1 through its upper and lower surfaces; the cross-sectional dimensions of the main body of the steel sleeve 3 are the same as those of the square tube steel column 1. As can be seen from the figure, a reversed L-shaped steel end connector 9 and its cover plate 4 are respectively provided on the four side surfaces of the steel sleeve 3. Three bolt holes 8 with screw threads for the screw rod are respectively provided on the two upper side ear plates of the reversed L-shaped steel end connector 9, and bolt holes are also provided at the corresponding positions on both sides of its cover plate 4. The thickness of the two upper side ear plates of the reversed L-shaped steel end connector 9 is 20 mm. The design of the bolt holes with screw threads for the screw rod is beneficial to reducing the risk coefficient of high-altitude construction; the I-shaped steel beam 2 is placed inside the reversed L-shaped steel end connector 9. The inner cross-sectional dimensions of the reversed L-shaped steel end connector 9 are similar to the cross-sectional dimensions of the I-shaped steel beam (for example, the inner cross-sectional width of the reversed L-shaped steel end connector 9 is slightly larger than the cross-sectional width of the I-shaped steel beam, and the two are in clearance fit. The inner cross-sectional height of the reversed L-shaped steel end connector 9 is equal to the cross-sectional height of the I-shaped steel beam). By tightening the high-strength bolts 5 in the bolt holes 8 on the ear plates of the reversed L-shaped steel end connector 9 and the bolt holes on the cover plate 4, the I-shaped steel beam 2 is pressed tightly to complete the lapping of the I-shaped steel beam 2 and the steel sleeve 3, forming a reliable connection. This assembly process is convenient and fast; the surface where the cover plate is connected to the I-shaped steel beam is a high-strength friction surface. The connection between the high-strength bolts 5 and the ear plates causes the cover plate 4 to press the I-shaped steel beam 2, forming an initial prestress, increasing the friction force between the cover plate 4 and the I-shaped steel beam 2, realizing semi-rigid connection, and transferring the bending moment and shear force of the I-shaped steel beam 2 segment to the end plate of the reversed L-shaped steel end connector 9, realizing reasonable force of the structure. On the four sides of the upper and lower surfaces of the steel sleeve 3, a convex wedge-shaped connector 10 is respectively provided, and bolt holes 8 with screw threads for the screw rod are respectively provided at the four corners. At the corresponding positions on the four sides of the end of the square tube steel column 1, prefabricated wedge-shaped grooves 12 that cooperate with the convex wedge-shaped connectors are provided. At the corresponding positions of the four corners of the end of the square tube steel column 1 and the four corners of the upper and lower surfaces of the steel sleeve 3 where the bolt holes 8 are located, bolt holes are provided, and groove holes 13 are opened at the four corners of the square tube steel column 1 above the bolt holes. The convex wedge-shaped connector 10 on the steel sleeve 3 is inserted into the prefabricated wedge-shaped groove 12 at the end of the square tube steel column 1, and the bearing-type high-strength screw 6 is screwed into the bolt holes on the steel sleeve 3 and the square tube steel column 1. The nut 7 is screwed onto the upper part of the bearing-type high-strength screw 6 through the groove holes 13 at the four corners of the square tube steel column 1 to complete the connection between the steel sleeve 3 and the square tube steel column 1; the square tube steel column and the steel sleeve are vertically connected through the wedge-shaped connectors to ensure that the axes of the vertical members are on the same straight line, and are connected through the bearing-type high-strength screws at the column foot to resist lateral forces and eccentric loads. From Figure 4 , Figure 5 As can be seen, a stiffening rib 11 is provided at the connection between the bottom of the reversed L-shaped steel end connector 9 and the side surface of the main body of the steel sleeve 3 to resist the shear force transmitted by the beam segment. From Figure 8It can be seen that both ends of the I-shaped steel beam 2 are closed, and stiffeners 14 are provided on the inner side of the cross-section of the I-shaped steel beam 2 near the beam ends, and the distance from the beam ends is the transverse elongation length of the inverted L-shaped steel end connector 9 in the steel sleeve 3; the transverse elongation length of the inverted L-shaped steel end connector 9 is twice the height of the I-shaped steel beam 2.

[0033] The construction method of the above-mentioned steel sleeve type square tube steel column and I-shaped steel beam assembly joint includes the following steps:

[0034] (1) Prefabricate the square tube steel column, I-shaped steel beam, steel sleeve and cover plate in the factory according to the design requirements; among them, the steel sleeve is integrally cast from steel, and it includes a convex wedge-shaped connector, an inverted L-shaped steel end connector, bolt holes with screw threading, and stiffeners; the bolt holes with screw threading are formed by turning on a lathe, which effectively reduces the welding between components on each vertical surface of the steel sleeve and avoids fatigue failure at the connection under reciprocating loads; wedge-shaped grooves are prefabricated on the inner side of the end of the square tube steel column, and bolt holes are reserved at the four right angles; the cover plate is made of steel plate, and bolt holes are reserved on it; both ends of the I-shaped steel beam are closed, and stiffeners are prefabricated on the inner side of the cross-section of the I-shaped steel beam near the beam ends, and the distance from the beam ends is the transverse elongation length of the inverted L-shaped steel end connector in the steel sleeve, and the transverse elongation length of the inverted L-shaped steel end connector is twice the height of the I-shaped steel beam.

[0035] (2) Install the bearing-type high-strength screw into the bolt hole with screw threading on the steel sleeve.

[0036] (3) Align and connect the steel sleeve and the square tube steel column through the convex wedge-shaped connector and the prefabricated wedge-shaped groove, adjust the height of the bearing-type high-strength screw up and down, so that the bearing-type high-strength screw passes through the bolt hole in the square tube steel column, and tighten the nut to complete the connection between the steel sleeve and the square tube steel column.

[0037] (4) Lap the I-shaped steel beam on the inverted L-shaped steel end connector.

[0038] (5) Place the cover plate on the inverted L-shaped steel end connector, the friction surface of the cover plate is in contact with the I-shaped steel beam, align the bolt holes, and connect the cover plate and the inverted L-shaped steel end connector with high-strength bolts to complete the lap between the steel sleeve and the I-shaped steel beam.

[0039] The above profiles do not require secondary processing at the construction site, there are fewer types of assembled components, there is no welding operation during the construction process, and they can be directly installed, and the construction is convenient and fast.

Claims

1. A steel sleeve type square tube steel column and I-shaped steel beam assembly joint, characterized in that: It includes a steel sleeve. The main body of the steel sleeve is a square tube member, which is connected to the I-shaped steel beam through its four side faces and to the square tube steel column through its upper and lower faces; on each of the four side faces of the steel sleeve, there is a reversed L-shaped steel end connector and its cover plate. The two upper side ear plates of the reversed L-shaped steel end connector are provided with several bolt holes with screw threads for the screw rods, and the corresponding positions on both sides of the cover plate are also provided with bolt holes. The I-shaped steel beam is placed inside the reversed L-shaped steel end connector, and the lap joint between the I-shaped steel beam and the steel sleeve is completed by tightening the high-strength bolts in the bolt holes of the cover plate and the reversed L-shaped steel end connector to press the I-shaped steel beam; on each of the four sides of the upper and lower faces of the steel sleeve, there is a convex wedge-shaped connector, and on each of the four corners, there are bolt holes with screw threads for the screw rods. At the corresponding positions inside the four sides of the end of the square tube steel column, there are prefabricated wedge-shaped grooves that match the convex wedge-shaped connectors. At the corresponding positions of the four corners of the end of the square tube steel column and the four corners of the upper and lower faces of the steel sleeve, there are bolt holes, and at the four corners of the square tube steel column above these bolt holes, there are slotted holes. The convex wedge-shaped connectors on the steel sleeve are inserted into the prefabricated wedge-shaped grooves at the end of the square tube steel column, and the connection between the steel sleeve and the square tube steel column is completed by screwing the bearing-type high-strength screw rods into the bolt holes on the steel sleeve and the square tube steel column and screwing the nuts onto the upper parts of the bearing-type high-strength screw rods through the slotted holes at the four corners of the square tube steel column; At the connection between the bottom of the reversed L-shaped steel end connector and the side face of the main body of the steel sleeve, there is a stiffening rib; Both ends of the I-shaped steel beam are closed. Inside the cross-section of the I-shaped steel beam near the beam end, there is a stiffening rib, and the distance from the beam end is the transverse elongation length of the reversed L-shaped steel end connector in the steel sleeve; the transverse elongation length of the reversed L-shaped steel end connector is twice the height of the I-shaped steel beam.

2. The assembled joint of the steel sleeve type square steel tube column and the I-shaped steel beam according to claim 1, wherein: The cross-sectional dimensions of the main body of the steel sleeve are the same as those of the square tube steel column; the inner cross-sectional dimensions of the reversed L-shaped steel end connector are similar to the cross-sectional dimensions of the I-shaped steel beam.

3. The assembled joint of the steel sleeve type square steel tube column and the I-shaped steel beam according to claim 1, characterized in that: The thickness of the two upper side ear plates of the reversed L-shaped steel end connector is 20 mm.

4. The assembled joint of the steel sleeve type square steel tube column and the I-shaped steel beam according to claim 1, characterized in that: The surface of the cover plate connected to the I-shaped steel beam is a high-strength friction surface.

5. A construction method for the assembly joint of a steel sleeve type square steel tube column and an I-shaped steel beam as described in claim 1, characterized in that It includes the following steps: (1) Prefabricate the square tube steel column, I-shaped steel beam, steel sleeve and cover plate in the factory according to the design requirements; among them, the steel sleeve is integrally cast from steel, which includes convex wedge-shaped connectors, reversed L-shaped steel end connectors, bolt holes with screw threads for the screw rods and stiffening ribs. The bolt holes with screw threads for the screw rods are formed by turning on a lathe; in the inner side of the end of the square tube steel column, prefabricated wedge-shaped grooves and bolt holes are reserved at the four right angles; the cover plate is made of steel plate, and bolt holes are reserved on it; both ends of the I-shaped steel beam are closed, and stiffening ribs are prefabricated inside the cross-section of the I-shaped steel beam near the beam end, and the distance from the beam end is the transverse elongation length of the reversed L-shaped steel end connector in the steel sleeve, and the transverse elongation length of the reversed L-shaped steel end connector is twice the height of the I-shaped steel beam; (2) Install the bearing-type high-strength screw rods into the bolt holes with screw threads for the screw rods on the steel sleeve; (3) Align and connect the steel sleeve and the square steel pipe column through the convex wedge-shaped connector and the prefabricated wedge-shaped groove. Adjust the height of the bearing-type high-strength screw up and down, so that the bearing-type high-strength screw passes through the bolt hole in the square steel pipe column, and tighten the nut to complete the connection between the steel sleeve and the square steel pipe column; (4) Lap the I-shaped steel beam on the end connector of the inverted L-shaped steel; (5) Place the cover plate on the end connector of the inverted L-shaped steel. The friction surface of the cover plate contacts the I-shaped steel beam, align the bolt holes, and connect the cover plate and the end connector of the inverted L-shaped steel with high-strength bolts to complete the lap joint between the steel sleeve and the I-shaped steel beam.

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