Connecting joint of hook and h-shaped steel beam and joint installation method

Abstract

The application discloses a connecting joint of a lifting hook and an H-shaped steel beam and a joint mounting method. In the joint, two positioning holes symmetrical about a web plate are formed in a lower flange plate, and a reinforcing component for reinforcing the two positioning holes is welded to the bottom surface of the lower flange plate; each positioning hole is provided with two stiffening ribs and a connecting plate on the side of the positioning hole, the two stiffening ribs are symmetrically arranged about the positioning hole, the top edge, the bottom edge and the inner side edge of the stiffening rib are welded to the bottom surface of an upper flange plate, the top surface of the lower flange plate and the web plate respectively, and the top edge and the two side edges of the connecting plate are welded to the bottom surface of the upper flange plate and the two stiffening ribs respectively; the stiffening ribs and the connecting plates on the two sides are symmetrical about the web plate; the two ends of the lifting hook are respectively upwardly threaded through the two positioning holes and are respectively welded to the side of the two connecting plates away from the web plate by means of vertical sections; and the two ends of the lifting hook are welded with enlarged portions to avoid being pulled out of the positioning holes. The upper flange plate of the joint is not provided with holes, the vertical load can be dispersed to the periphery, and stress concentration at the hole opening position is avoided.

Description

Technical Field

[0001] This invention belongs to the field of steel structures, specifically relating to a connection node between a hook and an H-shaped steel beam and a method for installing the node. Background Technology

[0002] In steel structure buildings for civil, laboratory, and industrial use, the increasing diversity of building functions and the growing amount of equipment necessitate the installation and maintenance of this equipment. This leads to the creation of connection nodes between hooks and H-beams. These nodes connect the common H-beams to the hooks, using the hooks as fixed lifting points and the H-beams to bear the loads on the hooks during installation or maintenance. In civil steel structure buildings, this node is typically located on the hook beam at the top of the elevator shaft, where the load is relatively small. However, since floor decking is usually laid on the H-beams, this node may interfere with the floor decking installation. In laboratory steel structure buildings, this node is generally used for temporary lifting of heavy objects, with relatively large loads. In industrial steel structure buildings, this node is typically used for lifting heavy equipment during maintenance, with very large loads and high load-bearing requirements.

[0003] Currently, there are two main structures for the connection between the hook and the H-beam: 1) Both the upper and lower flanges of the H-beam have openings. The hook is passed through the openings on the upper and lower flanges and then tightened with bolts. In this structure, because both the upper and lower flanges have openings, it not only affects the strength of the H-beam at the joint, but also, if the opening precision is not high, there will be problems with smooth passage. Furthermore, tightening with nuts will cause stress concentration at one point. Moreover, for civil steel structure buildings, the upper flange is generally connected to the floor deck. 1) The part of the bolt protruding from the upper flange plate will affect the laying of the floor deck and cause inconvenience in construction; 2) The lower flange plate of the H-shaped steel beam is opened, and the hook is passed through the lower flange plate and then bent horizontally and welded to the top surface of the lower flange plate. In this structure, when the hook is under tension, the bent section of the hook will cause a certain amount of compression to the opening, and will cause the lower flange plate to be subjected to vertical downward out-of-plane tension. The lower flange plate will undergo out-of-plane deformation, and the stress concentration will be more obvious, which will affect the stress performance of the section near the opening and reduce the bearing capacity at the node.

[0004] Furthermore, neither of the above two structures provides reinforcement for the openings at the flange plate, posing a potential risk to the joint strength. Summary of the Invention

[0005] The purpose of this invention is to provide a connection node between a hook and an H-beam, and an installation method for the node. The upper flange plate of the node is not perforated, which avoids damaging or weakening the upper flange plate, facilitates perforation, and does not affect the laying of the floor deck. It can disperse the vertical load of the hook to the outside, avoids the weakest part being directly subjected to force and causing obvious stress concentration, ensures the rigidity and strength of the perforated part and the load-bearing performance of the entire beam, and prevents the danger of falling off.

[0006] The technical solution adopted in this invention is: A connection node between a hook and an H-beam has two symmetrical positioning holes about the web on the lower flange plate. A reinforcing member for reinforcing the two positioning holes is welded to the bottom surface of the lower flange plate. Each positioning hole is flanked by two stiffening ribs and a connecting plate. The two stiffening ribs are symmetrically arranged about the positioning holes. The top, bottom, and inner edges of the stiffening ribs are welded to the bottom surface of the upper flange plate, the top surface of the lower flange plate, and the web plate, respectively. The top and two sides of the connecting plate are welded to the bottom surface of the upper flange plate and the two stiffening ribs, respectively. Both the stiffening ribs and the connecting plates on both sides are symmetrical about the web plate. The two ends of the hook pass upwards through the two positioning holes and are welded vertically to the side of the connecting plates away from the web plate. Enlarged portions are welded to both ends of the hook to prevent it from detaching from the positioning holes.

[0007] Preferably, the reinforcing member is a reinforcing plate with through holes corresponding to the two positioning holes, and the reinforcing plate extends to the location of the stiffening ribs.

[0008] Preferably, the reinforcing plate and the bottom surface of the lower flange plate are welded together by fillet welds on all four sides.

[0009] Preferably, the reinforcing member consists of two reinforcing vertical ribs, which are symmetrical about the web. The reinforcing vertical ribs are close to the positioning hole and located on the side of the positioning hole away from the web. The two ends of the reinforcing vertical ribs are aligned with the stiffening ribs.

[0010] Preferably, the reinforcing vertical rib and the bottom surface of the lower flange plate are welded on both sides.

[0011] Preferably, the hook and the connecting plate are welded on both sides with a weld length of not less than 5 times the hook diameter, and the enlarged part and the hook are welded on both sides with a weld length of not less than 5 times the hook diameter.

[0012] Preferably, the enlarged portion is a short rib with the same diameter as the hook.

[0013] Preferably, the stiffening rib thickness is equal to the web thickness, and the connecting plate thickness is greater than the web thickness.

[0014] An installation method for the connection node between the hook and the H-beam: First, determine the position and size of the hook, as well as the position and size of the reinforcing members, stiffening ribs, and connecting plates, based on the dimensions and span of the H-beam, the lifting range, and the load. Then, position and open two positioning holes on the lower flange plate, making the positioning holes slightly larger than the hook diameter. Next, weld the reinforcing members, stiffening ribs, and connecting plates onto the H-beam, wherein the stiffening ribs are positioned and welded first, and then the connecting plates are positioned and welded, ensuring that the side of the connecting plate away from the web is tangent to the positioning holes on the projection plane. Then, allow both ends of the hook to pass upward through the two positioning holes respectively and weld them vertically to the side of the connecting plates away from the web. Finally, weld enlarged portions at both ends of the hook to prevent it from coming out of the positioning holes.

[0015] When determining the position and size of the hook, as well as the position and size of the reinforcing components, stiffening ribs, and connecting plates, finite element simulation analysis is performed to simulate the working conditions of the hook under load and analyze the stress distribution in the node area, thereby verifying whether the node is safe and feasible.

[0016] The beneficial effects of this invention are: This node only has a hole in the lower flange plate, not the upper flange plate, avoiding damage or weakening of the upper flange plate. Only one hole is drilled at the end of the hook, making drilling convenient. Furthermore, there are no bolts on the top surface of the upper flange plate, so it will not affect the laying of the floor decking in civil steel structures. In this node, the force on the hook is distributed to the connecting plates on both sides. The force on the connecting plates is distributed not only to the upper flange plate but also to the stiffening ribs on both sides (the connecting plates do not directly transmit force to the lower flange plate). The force on the stiffening ribs is simultaneously distributed to the upper flange plate, lower flange plate, and web plate. The stiffening ribs and connecting plates surrounding the hook distribute the vertical load of the hook outwards, preventing the section at the positioning hole from directly bearing the vertical load and avoiding stress concentration at the weakest point. This force transmission structure is more rational and eliminates the need for openings in the upper flange plate. In this node, the reinforcing member strengthens the positioning hole, ensuring the rigidity and strength of the opening and the load-bearing performance of the entire beam. In this node, the enlarged section prevents the hook from falling out of the positioning hole and causing danger in case of hook failure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the connection node between the hook and the H-shaped steel beam in Embodiment 1 of the present invention.

[0019] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0020] Figure 3 yes Figure 1 Cross-sectional view at point BB.

[0021] Figure 4 This is a schematic diagram of the connection node between the hook and the H-shaped steel beam in Embodiment 2 of the present invention.

[0022] Figure 5 yes Figure 4 Cross-sectional view at point AA.

[0023] Figure 6 yes Figure 4 Cross-sectional view at point BB.

[0024] Figure 7 This is a schematic diagram of the finite element simulation analysis performed by this invention.

[0025] In the figure: 1-lower flange plate; 2-connecting plate; 3-stiffening rib; 4-enlarged section; 5-upper flange plate; 6-web plate; 7-positioning hole; 8-through hole; 9-hook; 10-reinforcing plate; 11-reinforcing vertical rib. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0031] Example 1 This embodiment discloses a connection node between a hook and an H-beam, such as... Figures 1 to 3 As shown: Two positioning holes 7 are provided on the lower flange plate 1, symmetrical about the web plate 6. A reinforcing member for reinforcing the two positioning holes 7 is welded to the bottom surface of the lower flange plate 1. There are two stiffening ribs 3 and a connecting plate 2 on each side of the positioning hole 7. The two stiffening ribs 3 are symmetrical about the positioning holes 7. The top edge, bottom edge and inner side edge of the stiffening rib 3 are welded to the bottom surface of the upper flange plate 5, the top surface of the lower flange plate 1 and the web plate 6, respectively. The top edge and two side edges of the connecting plate 2 are welded to the bottom surface of the upper flange plate 5 and the two stiffening ribs 3, respectively. The stiffening ribs 3 and the connecting plate 2 on both sides are symmetrical about the web plate 6. The two ends of the hook 9 pass upward through the two positioning holes 7 and are welded vertically to the side of the connecting plate 2 away from the web plate 6. The two ends of the hook 9 are welded with enlarged parts 4 to prevent them from falling out of the positioning holes 7.

[0032] This node only has a hole in the lower flange plate 1, while the upper flange plate 5 remains un-holed, avoiding damage or weakening of the upper flange plate 5. The end of the hook 9 has only one hole, making drilling convenient. Furthermore, there are no bolts on the top surface of the upper flange plate 5, so it will not affect the laying of the floor decking for civil steel structures. In this node, the force on the hook 9 is distributed to the connecting plates 2 on both sides. The force on the connecting plates 2 is distributed not only to the upper flange plate 5 but also to the stiffening ribs 3 on both sides (the connecting plates 2 do not directly transmit force to the lower flange plate 1). The force on the stiffening ribs 3 is simultaneously distributed to the upper flange plate 5, the lower flange plate 1, and the web plate. 6. The stiffening ribs 3 and connecting plates 2 are arranged around the periphery of the hook 9, which can disperse the vertical load of the hook 9 to the outside, avoiding the section at the positioning hole 7 from directly bearing the vertical load, and avoiding the weakest part from being directly stressed and causing obvious stress concentration. This force transmission structure is more reasonable and does not require openings in the upper flange plate 5. In this node, the reinforcing member can reinforce the positioning hole 7, ensuring the rigidity and strength of the opening part and the load-bearing performance of the entire beam. In this node, the enlarged part 4 can prevent the hook 9 from falling out of the positioning hole and causing danger when the hook 9 fails.

[0033] like Figures 1 to 3As shown, in this embodiment, preferably, the reinforcing member is a reinforcing plate 10, on which through holes 8 corresponding to the two positioning holes 7 are provided. The reinforcing plate 10 extends to the location of the stiffening rib 3. The reinforcing plate 10 can compensate for the stiffness of the positioning hole 7, ensuring the continuity of the force on the entire beam. It can also compensate for the cross-sectional opening area of ​​the lower flange plate 1, ensuring the cross-sectional strength of the H-beam. Under the ultimate load, the node will fail after the component, which conforms to the design concept of "strong node and weak component". Furthermore, preferably, the reinforcing plate 10 and the bottom surface of the lower flange plate 1 are welded together by fillet welds on all four sides, which is reliable and firm.

[0034] In this embodiment, preferably, the hook 9 and the connecting plate 2 are connected by double-sided welds with a weld length of not less than 5 times the diameter of the hook 9, and the enlarged part 4 and the hook 9 are connected by double-sided welds with a weld length of not less than 5 times the diameter of the hook 9, so that the connection is reliable and firm.

[0035] In this embodiment, preferably, the enlarged portion 4 is a short rib with the same diameter as the hook 9.

[0036] In this embodiment, preferably, the thickness of the stiffening rib 3 is equal to the thickness of the web plate 6, and the thickness of the connecting plate 2 is greater than the thickness of the web plate 6.

[0037] Example 2 This embodiment discloses another connection node between the hook and the H-beam, such as... Figures 4 to 6 As shown, the difference between this and Embodiment 1 is as follows: the reinforcing member consists of two reinforcing vertical ribs 11, which are symmetrical about the web plate 6. The reinforcing vertical ribs 11 are close to the positioning hole 7 and are located on the side of the positioning hole 7 away from the web plate 6. The two ends of the reinforcing vertical ribs 11 are aligned with the stiffening ribs 3, which ensures the rigidity and strength of the opening and the stress performance of the entire beam. Furthermore, the reinforcing vertical ribs 11 and the bottom surface of the lower flange plate 1 are welded on both sides, which ensures reliable and firm welding.

[0038] In the above embodiments 1 and 2, the nodes can be applied in steel structure buildings such as civil, laboratory, and industrial buildings, and can be used to lift light or heavy equipment.

[0039] Example 3 This embodiment discloses the node installation method in Embodiments 1 and 2 above, including the following steps: S1) Determine the position and size of the hook 9, as well as the position and size of the reinforcing members, stiffening ribs 3 and connecting plates 2, based on the size and span of the H-beam, the lifting range and load.

[0040] S2) Position and open two positioning holes 7 on the lower flange plate 1, so that the positioning holes 7 are slightly larger than the diameter of the hook 9 (e.g., the diameter of the hook 9 + 2mm).

[0041] S3) Weld reinforcing members, stiffening ribs 3 and connecting plates 2 onto the H-beam. First, position and weld the stiffening ribs 3, then position and weld the connecting plates 2, ensuring that the side of the connecting plates 2 away from the web 6 is tangent to the positioning hole 7 on the projection plane.

[0042] S4) First, let the two ends of the hook 9 pass through the two positioning holes 7 respectively and weld them vertically to the side of the connecting plate 2 away from the web plate 6. Then, weld the enlarged part 4 at both ends of the hook 9 to prevent it from coming out of the positioning hole 7.

[0043] When determining the position and dimensions of the hook 9, as well as the positions and dimensions of the reinforcing components, stiffening ribs 3, and connecting plates 2, finite element simulation analysis is performed to simulate the load-bearing conditions of the hook 9 and analyze the stress distribution in the nodal area, thereby verifying the safety and feasibility of the node. For example, if this node is used on the hook beam at the top of the elevator shaft, and according to elevator maintenance requirements, the hook needs to bear a maintenance load of 15kN, and the H-beam here has a cross-sectional dimension of 200x200mm, a span of 2.8m, and an ultimate load of approximately 150kN, finite element simulation analysis is performed. Figure 7 As shown in the analysis results, the load is transmitted to the periphery of the positioning hole 7 through the connecting plate 2 and the stiffening rib 3. The local stress concentration phenomenon in the positioning hole 7 is relatively mild, and the stress at the opening of the lower flange 1 is less than the material yield strength due to the reinforcement measures taken, which proves that the node is theoretically safe and feasible. The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A connection node between a hook and an H-beam, characterized in that: Two symmetrical positioning holes about the web are provided on the lower flange plate. Reinforcing members for reinforcing the two positioning holes are welded to the bottom surface of the lower flange plate. There are two stiffening ribs and a connecting plate on each side of the positioning hole. The two stiffening ribs are symmetrical about the positioning holes. The top edge, bottom edge and inner side edge of the stiffening ribs are welded to the bottom surface of the upper flange plate, the top surface of the lower flange plate and the web plate, respectively. The top edge and two side edges of the connecting plate are welded to the bottom surface of the upper flange plate and the two stiffening ribs, respectively. The stiffening ribs and connecting plates on both sides are symmetrical about the web plate. The two ends of the hook pass upward through the two positioning holes and are welded vertically to the side of the connecting plates away from the web plate. The two ends of the hook are welded with enlarged parts to prevent them from coming out of the positioning holes.

2. The connection node between the hook and the H-beam as described in claim 1, characterized in that: The reinforcing member is a reinforcing plate with through holes corresponding to the two positioning holes. The reinforcing plate extends to the location of the stiffening ribs.

3. The connection node between the hook and the H-beam as described in claim 2, characterized in that: The reinforcing plate and the bottom surface of the lower flange plate are welded together by fillet welds on all four sides.

4. The connection node between the hook and the H-beam as described in claim 1, characterized in that: The reinforcing member consists of two reinforcing vertical ribs, which are symmetrical about the web. The reinforcing vertical ribs are close to the positioning holes and are located on the side of the positioning holes away from the web. The two ends of the reinforcing vertical ribs are aligned with the stiffening ribs.

5. The connection node between the hook and the H-beam as described in claim 4, characterized in that: The reinforcing vertical ribs and the bottom surface of the lower flange plate are welded on both sides.

6. The connection node between the hook and the H-beam as described in claim 1, characterized in that: The hook and the connecting plate shall be welded on both sides with a weld length of not less than 5 times the hook diameter. The enlarged part and the hook shall be welded on both sides with a weld length of not less than 5 times the hook diameter.

7. The connection node between the hook and the H-beam as described in claim 1 or 6, characterized in that: The enlarged section consists of short reinforcing bars with the same diameter as the hook.

8. The connection node between the hook and the H-beam as described in claim 1, characterized in that: The thickness of the stiffening rib is equal to the thickness of the web plate, and the thickness of the connecting plate is greater than the thickness of the web plate.

9. A node installation method, characterized in that: Install the connection node between the hook and the H-beam as described in any one of claims 1 to 8; first, determine the position and size of the hook, as well as the position and size of the reinforcing members, stiffening ribs, and connecting plates, according to the size and span of the H-beam, the lifting range, and the load; then, position and open two positioning holes on the lower flange plate, making the positioning holes slightly larger than the hook diameter; then, weld the reinforcing members, stiffening ribs, and connecting plates on the H-beam, wherein the stiffening ribs are positioned and welded first, and then the connecting plates are positioned and welded, ensuring that the side of the connecting plate away from the web is tangent to the positioning hole on the projection plane; then, first let the two ends of the hook pass upward through the two positioning holes respectively and weld them vertically to the side of the connecting plates away from the web respectively, and then weld enlarged portions at both ends of the hook to prevent them from coming out of the positioning holes.

10. The node installation method as described in claim 9, characterized in that: When determining the position and size of the hook, as well as the position and size of the reinforcing components, stiffening ribs, and connecting plates, finite element simulation analysis is performed to simulate the working conditions of the hook under load and analyze the stress distribution in the node area, thereby verifying whether the node is safe and feasible.

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