Reinforcing structure partially coated with steel-concrete composite structure
By adding supplemental steel plates to H-type steel beams in PEC structures, the load-bearing capacity of partially encased steel-concrete composite structures is enhanced, addressing inefficiencies and cost issues in prefabricated construction.
Patent Information
- Application Number
- CN202422160239.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-04
AI Technical Summary
During the construction process, the existing PEC structure has insufficient bearing capacity due to design changes, resulting in demolition and redone or on-site reinforcement, increasing construction period and cost.
Reinforced steel plates are added on both sides of the H-shaped steel web of the PEC structure, and fixed with the H-shaped steel flange through the fillet weld to form a box + intermediate rib structure to improve load bearing capacity.
By adding reinforced steel plates to the PEC structure, the load bearing capacity can be effectively improved, construction complexity and cost can be reduced, and the actual stress changes are adapted to the site.
Smart Images
Figure CN223104201U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of prefabricated buildings, and particularly relates to a reinforcement structure for a partially clad steel-concrete composite structure. Background Technique
[0002] A partially clad steel-concrete composite structure (referred to as PEC structure for short) is a new type of steel-concrete composite structure formed by welding steel bars or flat steel in the cavities on both sides of the web of an H-shaped steel and pouring concrete. The PEC structure is currently widely used in prefabricated buildings. The PEC structure is usually prefabricated in a factory according to design requirements. The PEC structure is transported to the construction site and assembled. In the actual construction process, there are often certain changes from the actual design for various reasons, and the already processed and assembled PEC structure may have insufficient bearing capacity due to the changes. After this situation occurs, if the PEC structure is demolished and prefabricated and assembled again, it will cause a delay in the construction period and an increase in cost. Without demolition, it is necessary to carry out on-site reinforcement treatment on the PEC structure with insufficient bearing capacity. This case is formally generated based on this application scenario. Content of the Utility Model
[0003] The utility model discloses a reinforcement structure for a partially clad steel-concrete composite structure, which performs section reinforcement on the basis of the original formed PEC structure, and changes the H-shaped steel of the original skeleton into a structure of a box shape + an intermediate rib, which can greatly improve the bearing capacity of the steel structure skeleton part.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0005] A reinforcement structure for a partially clad steel-concrete composite structure includes an H-shaped steel and precast concrete in the cavities on both sides of the web of the H-shaped steel. A reinforcing steel plate is provided on the outer side of each precast concrete surface. Each reinforcing steel plate is fixedly welded to the upper flange and the lower flange of the H-shaped steel by fillet welds. The top surface of each reinforcing steel plate is lower than the top surface of the upper flange of the H-shaped steel, and the bottom surface of each reinforcing steel plate protrudes from the bottom surface of the lower flange of the H-shaped steel.
[0006] Further, the material of the reinforcing steel plate is the same as that of the H-shaped steel.
[0007] Further, the weld cross-section formed by the reinforcing steel plate and the flange of the H-shaped steel is a right triangle. Let the distance from the right-angled vertex of the cross-section to the hypotenuse of the triangle be the weld height. The weld height formed by welding the reinforcing steel plate and the flange of the H-shaped steel is not less than the thickness of the thinner plate among the flanges on both sides and the reinforcing steel plate.
[0008] Further, the right-angled side length of the weld formation cross-section is the weld leg height. When the thickness of the thinner plate is less than 6 mm, the weld leg height is equal to the thickness of the plate; when the thickness of the thinner plate is greater than or equal to 6 mm, the weld leg height is taken as 0.7 times the thickness of the plate.
[0009] Further, when the thickness of the thinner plate is greater than or equal to 6 mm, the weld leg height does not exceed 15 mm.
[0010] Further, the top surface of the reinforcing steel plate sinks 1.5 times the weld height relative to the top surface of the upper flange of the H-shaped steel, and the bottom surface of the reinforcing steel plate protrudes 1.5 times the weld height relative to the bottom surface of the lower flange of the H-shaped steel.
[0011] The utility model can effectively solve the cross-section reinforcement of PEC structural members when the load-bearing needs to be increased, can make the most of the originally formed PEC structural members to the greatest extent, and by adding reinforcing steel plates on the concrete surfaces on both sides, the H-shaped steel of the original skeleton is changed into a structure of box + intermediate ribs, which can greatly improve the load-bearing capacity of the steel structure skeleton part. The reinforcement structure disclosed by the utility model has the characteristics of convenient construction, strong load-bearing capacity and excellent economic performance. The cross-section reinforcement size can be adjusted according to the actual stress of the PEC structure, and it is especially suitable for on-site reinforcement treatment of PEC structural members that have been processed and completed the construction assembly. Brief Description of the Drawings
[0012] Figure 1 It is a schematic structural diagram for reinforcing the assembled PEC steel beam shown in the embodiment;
[0013] Figure 2 It is a schematic diagram showing the position marking of the weld height and the weld leg height on the weld cross-section given in the embodiment.
[0014] Description of the Reference Numerals in the Drawings:
[0015] 1. H-shaped steel; 101. Upper flange; 102. Lower flange; 2. Longitudinal reinforcement; 3. Stirrup; 4. Precast concrete; 5. Reinforcing steel plate; 6. Weld; 7. Stud; 8. Floor slab. Detailed Description of the Embodiment
[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.
[0017] This embodiment mainly proposes a reinforcement structure for PEC structural members. This reinforcement structure is applicable to both the cross-section reinforcement treatment of PEC structural members when they have been processed but not yet constructed and assembled, and more applicable to the cross-section reinforcement treatment of PEC structural members after they have been processed and constructed and assembled. This embodiment and the drawings mainly describe the latter, and the structure and operation in the former state are equally applicable.
[0018] AsFigure 1 As shown in the figure, the PEC structural member mainly includes an H-shaped steel 1 as the skeleton. The H-shaped steel 1 has an upper flange 101, a lower flange 102, and a web (not labeled). Stirrups 3 are arranged at intervals between the upper flange 101 and the lower flange 102, and the stirrups 3 are fixedly connected by longitudinal bars 2. The cavities on both sides of the web are filled with cast-in-place concrete to form precast concrete 4, and the above constitutes the PEC structural member. Figure 1 The PEC structural member shown is a PEC beam. When the PEC beam is assembled on-site, stud bolts 7 are welded to the top of the upper flange 101, and then cast-in-place concrete is formed on the top of the upper flange 101 to form a floor slab 8. For buildings with a relatively large span, multiple PEC beams are often arranged at intervals. Although the precast PEC beams are processed according to the bearing capacity requirements of the building design structure, due to certain changes in the building pattern during the specific construction process, the actual bearing capacity of some PEC beams increases. To avoid potential safety hazards, it is necessary to reinforce the assembled PEC beams to improve their bearing capacity.
[0019] The solution to the above problems in this embodiment is as follows: A reinforcing steel plate 5 is added outside the surface of the precast concrete 4 on each side of the PEC beam. The top end of the reinforcing steel plate 5 is welded to the upper flange 101 by fillet welds, and the bottom end of the reinforcing steel plate 5 is welded to the lower flange 102 by fillet welds. After reinforcement in this way, the original H-shaped steel of the skeleton becomes a box-shaped + intermediate rib structure, which can greatly improve the bearing capacity of the steel structure skeleton part. Since the reinforcing steel plate 5 is fixedly connected to the H-shaped steel 1 by welding, the material of the reinforcing steel plate 5 needs to be the same as that of the H-shaped steel 1 to facilitate the welding of the two. The thickness of the reinforcing steel plate 5 can be adjusted according to the calculation results. Figure 1 The width of the reinforcing steel plate 5 in the height direction is preferably equal to the height of the H-shaped steel 1, and the length of the reinforcing steel plate 5 can be set according to the calculation requirements and the change of the bearing capacity of the PEC structural member.
[0020] In this embodiment, it is selected to complete the fixation of the reinforcing steel plate 5 by fillet welds. To facilitate the welding operation at the construction site, the top surface of each side of the reinforcing steel plate 5 should be lower than the top surface of the upper flange 101 of the H-shaped steel 1, and the bottom surface of each side of the reinforcing steel plate 5 protrudes from the bottom surface of the lower flange 102 of the H-shaped steel 1. After such setting, an operation space is left for fillet welding. Figure 1 In the figure, the reinforcing steel plate 5 forms welds 6 with the upper flange 101 and the lower flange 102 of the H-shaped steel 1 respectively. The welds 6 are fillet welds, and the cross-section of the welds 6 is Figure 2 shown as a right triangle. For a clearer description, in combination with Figure 2 shown in the figure, the weld height and the fillet weld height mentioned in this embodiment below are defined. The weld height refers to Figure 2The distance from the right-angle vertex of the cross-section to the hypotenuse of the triangle, while the lengths of the two right-angled sides of the right-angled triangle represent the fillet weld height. The following is recommended for the sinking height of the reinforcing steel plate 5 relative to the H-beam 1: The top surface of the reinforcing steel plate 5 sinks 1.5 times the weld height relative to the top surface of the upper flange 101 of the H-beam 1, and the bottom surface of the reinforcing steel plate 5 protrudes 1.5 times the weld height relative to the bottom surface of the lower flange 102 of the H-beam 1.
[0021] Continuing the above description of the weld height setting, the flanges and the reinforcing steel plate 5 connected to each other on both sides of the weld 6 usually have inconsistent thicknesses. The weld height should not be less than the thickness of the thinner plate among the flanges and the reinforcing steel plate 5 on both sides of the weld. The fillet weld height setting is as follows: When the thickness of the thinner plate among the flanges and the reinforcing steel plate 5 on both sides of the weld < 6 mm, the fillet weld height should be equal to the thickness of the thinner plate; when the thickness of the thinner plate among the flanges and the reinforcing steel plate 5 on both sides of the weld ≥ 6 mm, the fillet weld height is taken as 0.7 times the thickness of the thinner plate, but generally does not exceed 15 mm.
[0022] The reinforcement structure disclosed by the present utility model can determine the thickness of the reinforcing steel plate 5, the weld height, the fillet weld height and other dimensions according to the actual bearing capacity borne by the PEC structural member. The reinforcement dimensions of the H-beam 1 cross-section can be adjusted according to the magnitude of the force, with flexible operation and convenient construction, and it is very suitable for local reinforcement of the assembled PEC members, having great economic advantages and practical value.
[0023] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A reinforcement structure for a partially clad steel-concrete composite structure, comprising an H-shaped steel and precast concrete located in cavities on both sides of the web of the H-shaped steel, characterized in that: Reinforcing steel plates are provided on the outer sides of the precast concrete surfaces on each side. The reinforcing steel plates on each side are respectively fixed to the upper flange and the lower flange of the H-shaped steel by fillet welding. The top surface of the reinforcing steel plate on each side is lower than the top surface of the upper flange of the H-shaped steel, and the bottom surface of the reinforcing steel plate on each side protrudes from the bottom surface of the lower flange of the H-shaped steel.
2. The reinforcement structure of a partially clad steel-concrete composite structure according to claim 1, characterized in that: The material of the reinforcing steel plate is the same as that of the H-shaped steel.
3. The reinforcement structure of a partially clad steel-concrete composite structure according to claim 1, characterized in that: The weld cross-section formed by the reinforcing steel plate and the flange of the H-shaped steel is a right triangle. The distance from the right-angled vertex of the cross-section to the hypotenuse of the triangle is defined as the weld height. The weld height formed by welding the reinforcing steel plate and the flange of the H-shaped steel is not less than the thickness of the thinner plate among the flanges and the reinforcing steel plate on both sides of the weld.
4. The reinforcement structure of a partially clad steel-concrete composite structure according to claim 3, characterized in that: The length of the right-angled side of the weld cross-section is the fillet weld height. When the thickness of the thinner plate is less than 6 mm, the fillet weld height is equal to the thickness of the plate; when the thickness of the thinner plate is greater than or equal to 6 mm, the fillet weld height is taken as 0.7 times the thickness of the plate.
5. The reinforcement structure of a partially clad steel-concrete composite structure according to claim 4, characterized in that: When the thickness of the thinner plate is greater than or equal to 6 mm, the fillet weld height does not exceed 15 mm.
6. The reinforcement structure of a partially clad steel-concrete composite structure according to claim 3, characterized in that: The top surface of the reinforcing steel plate sinks by 1.5 times the weld height relative to the top surface of the upper flange of the H-shaped steel, and the bottom surface of the reinforcing steel plate protrudes by 1.5 times the weld height relative to the bottom surface of the lower flange of the H-shaped steel.